WO2015176288A1

WO2015176288A1 - Preset frequency spectrum resource detection and occupancy method, and communication device

Info

Publication number: WO2015176288A1
Application number: PCT/CN2014/078162
Authority: WO
Inventors: 闫志宇
Original assignee: 华为技术有限公司
Priority date: 2014-05-22
Filing date: 2014-05-22
Publication date: 2015-11-26
Also published as: CN106464424A; CN106464424B

Abstract

The present invention relates to a preset frequency spectrum resource acquisition method, the method comprising: a communication device starts to execute clear channel assessment (CCA) on a shared channel in preset frequency spectrum resources at the start point of the CCA window of the subframe N in an LTE system; during CCA, before the counting time of the CCA of the communication device, the communication device assesses that the shared channel is occupied; alternatively, when the CCA execution time reaches the counting time of the CCA assessment of the communication device, ending the assessment of the clear state of the shared channel; if the time that the communication device executes CCA in the CCA window of the subframe N in the LTE system is equal to the counting time of the CCA of the communication device, then determining that the shared channel is clear, and transmitting in the shared channel the data required to be transmitted. An embodiment of the present invention ensures equal opportunity for each device to use the channel, and reduces channel occupation conflict.

Description

Preset spectrum resource detection and occupancy method and communication device

Technical field

The present invention relates to the field of communications, and in particular, to a method for acquiring a preset spectrum resource and a communication device. Background technique

Since the unlicensed spectrum has no constraints on the use of wireless communication systems and operators, one of the feasible solutions for the Long Term Evolution (LTE) system to utilize the unlicensed spectrum is to use the unlicensed spectrum as the secondary cell (Scell) spectrum resource of the LTE base station. . However, since the unlicensed spectrum has no constraints on the use of the wireless communication system and the operator, there are cases where multiple operators of multiple communication systems want to occupy the same spectrum. In the prior art, the wireless communication system needs to use the Listen-Before-Talk (LBT) rule when occupying the unlicensed spectrum communication, that is, the node first listens to whether the channel is idle before using the channel, and if the channel is idle, The channel on the unlicensed spectrum is used, but the time taken to occupy the channel is limited. After the time to occupy the channel reaches the maximum limit, the unlicensed spectrum must be released for a period of time. Before the next time the channel on the unlicensed spectrum is to be occupied, the channel must be monitored again for idleness. According to current regulations, when a wireless communication device is used on an unlicensed spectrum, it needs to meet the requirements of a frame-based communication device or a load-based communication device (Load based equipment). Said the mechanism requirements.

In a frame-based listening mechanism of a frame-based equipment, the communication device performs a Clear Channel Assessment (CCA) through energy detection before starting to occupy the transmission on the unlicensed frequency channel, the communication device The time each time you do CCA is called T _CCA . The time in which the communication device occupies the unlicensed frequency channel without re-doing the channel idle evaluation is defined as "channel occupation time". The communication device needs to release the signal after it is used by the unlicensed frequency channel. Putting the unlicensed spectrum channel for a period of time, the time for releasing the unlicensed frequency channel is defined as "channel

Idle time ". The communication device can re-execute the CCA at the end of the Idle period.

If the communication device detects that the channel is idle during the channel idle evaluation time, the signal can be transmitted on the unlicensed spectrum channel immediately. And if the communication device detects that the channel is occupied during the channel idle evaluation time, the communication device cannot transmit a signal on the unlicensed frequency channel for the next "fixed frame time". The length of "fixed frame long time" refers to the sum of the time of "channel occupation time" and "channel Idle time" of the communication device.

When the communication device requires the resources of the unlicensed spectrum channel to be occupied and released according to the frame-based equipment, and the data is transmitted and received according to the scheduling structure of the frame, the time synchronization between the plurality of communication devices is performed. In the following, each communication device listens to the channel idle condition before attempting to transmit data and attempts to occupy the channel, which causes a great chance that each communication device occupies a channel to collide. At the same time, because the time when the communication device listens to the channel and whether other devices occupy the channel and the "fixed frame for a long time" of the device, the chances of each device occupying the channel are not equal. Summary of the invention

The object of the present invention is to provide a method for acquiring a preset spectrum resource, so as to ensure that the opportunity for the preset spectrum resource occupation between the communication devices is as equal as possible, and avoid the conflict caused by the communication device preempting the resource. The preset spectrum resource has the following features: the usage of the channel that needs to listen to the preset spectrum resource before occupying the channel of the preset spectrum resource, and the occupation time of the channel occupying the preset spectrum resource once is limited, for example Unlicensed spectrum.

In a first aspect, an embodiment of the present invention provides a method for detecting and occupying a preset spectrum resource, where the method includes:

The communication device performs channel idle evaluation CCA on the channel of the preset spectrum resource at the start of the channel idle evaluation window of the system subframe N, and the channel idle evaluation window time length of the system subframe N is T seconds, The CCA count value N', N' of the communication device in the system subframe N is The maximum number of times the communication device performs CCA in the system subframe N;

When the communication device evaluates that the channel to the preset spectrum resource is occupied before the number of times the system subframe N performs CCA does not reach the channel idle evaluation count value of the current subframe, the communication device determines the pre- Setting the channel of the spectrum resource to be occupied, and ending the evaluation of the channel idle state of the preset spectrum resource;

When the number of CCAs of the communication device in the system subframe N reaches the channel idle evaluation count value of the current subframe in the communication device, determining that the channel of the preset spectrum resource is idle, and in the preset spectrum resource The data to be transmitted is transmitted in the channel;

The preset spectrum resource has the following features: Before using the channel of the preset spectrum resource, the usage of the channel of the preset spectrum resource needs to be monitored, and the occupation time of the channel occupying the preset spectrum resource is limited.

With reference to the first aspect, in a first possible implementation manner, when the number X of times the communication device performs CCA in the system subframe N does not reach the channel before the communication device evaluates the channel idle evaluation count value of the current subframe, When the channel of the preset spectrum resource is occupied, N'-x is used as the CCA count value of the subframe in which the device performs CCA next time.

With reference to the first aspect, in a second possible implementation manner, the communication device determines the preset spectrum resource by performing CCA times in the system subframe N to reach a channel idle evaluation count value of the communication device in the current subframe. After the channel is idle and transmits the data to be transmitted in the channel of the preset spectrum resource, it will be the CCA count value of the subframe in which the device performs CCA next time, and N _Q is the channel in the system for performing the preset spectrum resource. The CCA count value of the subframe of the CCA is first made by all the communication devices.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a third possible implementation manner, when the communication device does CCA in the system subframe N, the number of times does not reach the current Channels that are evaluated to the preset spectrum resource before the channel idle evaluation count value of the frame is occupied, if the channel from which the communication device evaluates to the preset spectrum resource is occupied, The end point of the fixed frame of the communication device for a long time is in the subframe M;

When the time period during which the communication device has experienced the fixed frame of the communication device is not coincident with the channel idle evaluation window of the subframe M, the starting point of the communication device performing the next CCA is the The starting point of the channel idle evaluation window of subframe M;

When the communication device has experienced a time period in which the fixed frame of the communication device is used for a long time coincides with the channel idle evaluation window of the subframe M, the communication device performs the next CCA starting point as a subframe. The starting point of the channel idle evaluation window of M+1.

With reference to the first aspect or the second possible implementation manner of the first aspect, in a fourth possible implementation, if the communication device starts transmitting a signal on a channel of the preset spectrum resource, The fixed frame of the communication device is terminated for a long time in the subframe M, B'J,

If the communication device starts transmitting a signal on the channel of the preset spectrum resource, the time period used by the communication device to complete the fixed frame of the communication device for a long time and the channel idle evaluation window of the subframe M are not At the time of coincidence, the starting point of the communication device performing the next CCA is the starting point of the channel idle evaluation window of the subframe M;

If the communication device starts transmitting a signal on the channel of the preset spectrum resource, the time period used by the communication device to complete the fixed frame of the communication device for a long time and the channel idle evaluation window of the subframe M are At the time of coincidence, the communication device performs the starting point of the next CCA as the starting point of the channel idle evaluation window of the subframe M+1.

With reference to the first aspect, or the second or fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, when determining that the channel of the preset spectrum resource is idle, and in the shared channel The data to be transmitted in the transmission further includes:

The communication device transmits a padding signal prior to scheduling data transmission, the padding signal being a random signal transmitted occupying a shared channel.

With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation, the method further includes: The communication device notifies the receiver of the signal that the notification carries the time length of the signal sent by the communication device in the last subframe of the channel transmission signal of the preset spectrum resource, or the communication device occupies the preset spectrum resource The channel transmits information about whether the transmitted signal in the last subframe of the signal is valid.

In conjunction with the first aspect, in a seventh possible implementation, the channel idle evaluation window is the last T seconds or the first T seconds of a system subframe.

In a second aspect, the embodiment of the present invention provides a communication device, where the communication device includes: a channel idle evaluation unit, configured to start the preset spectrum resource at a start point of a channel idle evaluation window of the system subframe N. The channel performs channel idle evaluation CCA, the channel idle evaluation window time length of the system subframe N is T seconds, and the CCA count value N', N' of the communication device in the system subframe N is that the communication device is at The maximum number of times CCA is executed in the system subframe N;

The channel idle evaluation unit evaluates the preset in the process of performing the CCA, when the communication device does not reach the channel idle evaluation count value of the current subframe in the system subframe N after the number of times the system performs CCA. If the channel of the spectrum resource is occupied, the communication device determines that the channel of the preset spectrum resource is occupied, and ends the evaluation of the channel idle state of the preset spectrum resource;

When the communication device performs CCA times in the system subframe N to reach a channel idle evaluation count value of the communication device in the current subframe, the channel idle evaluation unit determines that the channel of the preset spectrum resource is idle;

a transmitting unit, configured to transmit data that needs to be transmitted in the shared channel;

With reference to the second aspect, in a first possible implementation manner, the channel idle estimation unit does not reach the channel idle evaluation of the communication device in the current subframe when the communication device performs CCA in the system subframe N. When the count value is previously estimated to be occupied by the channel of the preset spectrum resource, N'-x is the CCA count value of the subframe in which the device performs CCA next time.

With reference to the second aspect, in a second possible implementation manner, the channel idle estimation unit determines that the preset number of CCAs in the system subframe N reaches a channel idle evaluation count value in the current subframe of the communication device, and determines the preset. After the channel of the spectrum resource is idle and the data to be transmitted is transmitted in the channel of the preset spectrum resource, it is used as the CCA count value of the subframe in which the device performs CCA next time, and N _Q is the preset spectrum resource in the system. All communication devices that the channel competes for the first time do the CCA count value of the subframe of the CCA.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a third possible implementation manner, when the channel state estimation unit does not reach the CCA in the system subframe N, the number of times does not reach the communication device Estimating a channel to the preset spectrum resource before the channel idle evaluation count value of the current subframe is occupied, if the channel estimated by the channel state estimation unit to the preset spectrum resource is occupied, The end point of the fixed frame of the communication device for a long time is in the subframe M;

When the time period during which the communication device has experienced the fixed frame of the communication device is not coincident with the channel idle evaluation window of the subframe M, the channel state estimation unit performs the next CCA starting point as a starting point of the channel idle evaluation window of the subframe M;

When the time period during which the communication device has experienced the fixed frame of the communication device is coincident with the channel idle evaluation window of the subframe M, the channel state estimating unit performs the next CCA starting point as The starting point of the channel idle evaluation window for subframe M+1. .

With reference to the second aspect or the second possible implementation manner of the second aspect, in a fourth possible implementation, if the transmitting unit starts transmitting a signal on the channel of the preset spectrum resource, The fixed frame of the communication device is terminated for a long time in the subframe M, B'J,

If the transmission unit starts transmitting a signal on the channel of the preset spectrum resource, the time period used by the communication device to complete the fixed frame of the communication device for a long time and the channel idle evaluation window of the subframe M are not At the time of coincidence, the channel estimation unit is performing the next CCA The starting point is the starting point of the channel idle evaluation window of the subframe M;

If the transmission unit starts transmitting a signal on the channel of the preset spectrum resource, the time period used by the communication device to complete the fixed frame of the communication device for a long time and the channel idle evaluation window of the subframe M are At the time of coincidence, the channel estimation unit performs a starting point of the next CCA as the starting point of the channel idle evaluation window of the subframe M+1.

With reference to the second aspect, or the second or fourth possible implementation manner of the second aspect, in the fifth possible implementation, the communications device further includes:

And a padding unit, configured to send a padding signal before scheduling data transmission, where the padding signal is a random signal that is sent by occupying a shared channel.

With reference to the fifth possible implementation of the second aspect, in a sixth possible implementation, the communications device further includes:

a notification unit, configured to notify a receiver of the signal, where the notification carries a length of time that the communication device uses a signal transmitted in a last subframe of a channel transmission signal of a preset spectrum resource, or the communication device occupies a preset spectrum The channel of the resource transmits information about whether the signal transmitted in the last subframe of the signal is valid.

In conjunction with the second aspect, in a seventh possible implementation, the channel idle evaluation window is the last T seconds or the first T seconds of a system subframe.

In a second aspect, an embodiment of the present invention provides a communications device, where the communications device includes: a transceiver;

Processor

Memory

An application physically stored in the memory, the application including instructions operable to cause the processor and the system to perform the following process:

The processor starts a channel idle evaluation CCA for the channel of the preset spectrum resource at a channel idle evaluation window starting point of the system subframe N, and the channel idle evaluation window of the system subframe N is The length of the interval is T seconds, and the CCA count value N', N' of the communication device in the system subframe 为 is the maximum number of times the communication device performs CCA in the system subframe ;;

The processor determines that the channel is occupied when the number of times the system performs CCA in the system subframe does not reach the channel idle evaluation count value of the current subframe before the communication device evaluates the channel of the preset spectrum resource. Setting the channel of the spectrum resource to be occupied, and ending the evaluation of the channel idle state of the preset spectrum resource;

Determining, by the transceiver, that the channel of the preset spectrum resource is idle, when the number of CCAs in the system subframe reaches the channel idle evaluation count value of the communication device in the current subframe, Transmitting data to be transmitted in a channel of a preset spectrum resource;

In conjunction with the third aspect, in a first possible implementation, the processor is configured in a system subframe

The number of times C of the CCA does not reach the time when the communication device evaluates the channel to the preset spectrum resource before the channel idle evaluation count value of the current subframe is occupied, and uses Ν'-χ as the subframe in which the device performs CCA next time. CCA count value.

In conjunction with the third aspect, in a second possible implementation, the processor is configured in a system subframe

The number of CCAs reaches the channel idle evaluation count value of the communication device in the current subframe, and determines that the channel of the preset spectrum resource is idle and transmits data to be transmitted in the channel of the preset spectrum resource, The CCA count value of the subframe in which the CCA is next executed, and N _Q is the CCA count value of the subframe in which the CCA subframe is first performed by all the communication devices in the system performing the channel competition of the preset spectrum resource.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a third possible implementation, the processor does not reach the number of times when the communication device performs CCA in the system subframe N. The communication device evaluates the preset spectrum resource before the channel idle evaluation count value of the current subframe The channel of the source is occupied. If the channel from which the communication device evaluates to the preset spectrum resource is occupied, the end point of the fixed frame that has experienced the long time of the communication device is in the subframe M; When the time period during which the communication device has experienced the fixed frame of the communication device is not coincident with the channel idle evaluation window of the subframe M, the processor performs the next CCA starting point as described The starting point of the channel idle evaluation window of subframe M;

When the time period during which the communication device has experienced the fixed frame of the communication device is coincident with the channel idle evaluation window of the subframe M, the processor executes the next CCA starting point as a subframe. The starting point of the channel idle evaluation window of M+1.

With reference to the third aspect or the second possible implementation manner of the third aspect, in a fourth possible implementation, if the transceiver starts transmitting a signal on the channel of the preset spectrum resource, The fixed frame of the communication device is terminated for a long time in the subframe M, B'J,

If the transceiver transmits a signal on the channel of the preset spectrum resource from the transceiver, the time period used by the communication device to complete the fixed frame of the communication device for a long time and the channel idle evaluation window of the subframe M are not At the time of coincidence, the processor performs a starting point of the next CCA as the starting point of the channel idle evaluation window of the subframe M;

If the transceiver transmits a signal on the channel of the preset spectrum resource, the time period used by the communication device to complete the fixed frame of the communication device for a long time and the channel idle evaluation window of the subframe M are At the time of coincidence, the processor executes the starting point of the next CCA as the starting point of the channel idle evaluation window of the subframe M+1.

With reference to the third aspect, or the second or fourth possible implementation manner of the third aspect, in a fifth possible implementation manner, the padding signal sent by the transceiver before scheduling data transmission, the padding signal A random signal sent to occupy a shared channel.

With reference to the fifth possible implementation manner of the third aspect, in a sixth possible implementation manner, the transceiver is configured to notify a receiver of the signal, where the notification carries a channel that is used by the communications device to occupy a preset spectrum resource. The length of time the signal was sent in the last subframe of the signal, or the communication The device occupies information about whether the signal transmitted in the last subframe of the channel transmission signal of the preset spectrum resource is valid.

In conjunction with the third aspect, in a seventh possible implementation, the channel idle evaluation window is the last T seconds or the first T seconds of a system subframe.

According to the method provided by the embodiment of the present invention, when the preset spectrum resource is required to be occupied and released according to the frame-based device, the multi-point access/avoidance mechanism is determined within a fixed time range within the subframe of the system. The time when the device performs CCA ensures that the opportunities for each device occupying the channel are as equal as possible, and the problem of occupying channel conflict is reduced. DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. It is obvious that the drawings in the following description are only the present invention. For some embodiments, other drawings may be obtained from those skilled in the art without any inventive labor.

1 is a schematic diagram of a CCA window in a method for acquiring a preset spectrum resource according to an embodiment of the present invention; FIG. 2 is a state reference diagram of a method for acquiring a preset spectrum resource according to an embodiment of the present invention; a state reference map for transmitting data by the communication device in the example;

4 is a state reference diagram of a method for acquiring a preset spectrum resource according to an embodiment of the present invention; FIG. 5 is a state reference diagram of a method for acquiring a preset spectrum resource according to an embodiment of the present invention; FIG. 7 is a state reference diagram of a method for acquiring a preset spectrum resource according to an embodiment of the present invention; FIG. 8 is a state reference diagram of a method for acquiring a preset spectrum resource according to an embodiment of the present invention; a structural diagram of a communication device;

9 is a structural diagram of another communication device in an embodiment of the present invention.

Embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. A method for detecting and occupying a preset spectrum resource is described in the embodiment of the present invention, where the method includes:

The communication device performs channel idle evaluation CCA on the channel of the preset spectrum resource at the start of the channel idle evaluation window of the system subframe N, and the channel idle evaluation window time length of the system subframe N is T seconds, The CCA count value Ν', N' of the communication device within system subframe N is the maximum number of times the communication device performs CCA within the system subframe 。.

When the number of times the communication device performs CCA in the system subframe does not reach the channel in which the predetermined spectrum resource is estimated before the communication device evaluates the channel idle evaluation count value of the current subframe, the communication device determines that the channel is occupied. The channel of the preset spectrum resource is occupied, and the evaluation of the channel idle state of the preset spectrum resource is ended;

When the communication device performs CCA times in the system subframe to reach a channel idle evaluation count value in the current subframe of the communication device, determining that the shared channel is idle, and transmitting data to be transmitted in the shared channel .

Specifically, the channel idle evaluation count time N'=T _eeA of the preset spectrum resource in the _{subframe is} not greater than Τ, where T _eeA is the time for the communication device to perform a channel idle evaluation. The number X of times the communication device performs the CCA is less than or equal to the CCA count value of the communication device subframe N;

In the embodiment of the present invention, the method for detecting whether the channel of the preset spectrum resource is occupied is not limited, and may be through energy detection or other methods.

Further, when the communication device estimates that the channel of the preset spectrum resource is occupied before the channel idle evaluation count time of the preset spectrum resource of the communication device, and the channel of the communication device in the system subframe N is idle The number of evaluations X in the evaluation window is smaller than the CCA count value N' of the communication device in the subframe N, and the communication device sets the CCA count value in the subframe in which the CCA is executed next to N'-X.

In an embodiment, if the communication device is evaluating the information of the preset spectrum resource After the channel is occupied by other communication devices, if the communication device evaluates that the channel of the preset spectrum resource is occupied, the end point of the fixed frame that has experienced the long time of the communication device is in the subframe M; When the communication device experiences a time period in which the fixed frame of the communication device is used for a long time and does not coincide with the channel idle evaluation window of the subframe M, the communication device performs the next CCA starting point as the child. The starting point of the channel idle evaluation window of frame M;

When the communication device has experienced a time period in which the fixed frame of the communication device is used for a long time coincides with the channel idle evaluation window of the subframe M, the communication device performs the next CCA starting point as a subframe. The starting point of the channel idle evaluation window for M+1.

In an embodiment, after the communication device determines that the channel of the preset spectrum resource is idle, and transmits data that needs to be transmitted in the channel of the preset spectrum resource, the communication device uses the communication device. The channel idle evaluation value when the CCA is executed next time, when the initial CCA is set, the time count initial value N ₀ , N ₀ *T _CCA ≤ T of all communication devices that perform channel competition of the preset spectrum resources in the system.

After the communication device transmits the data to be transmitted in the channel of the preset spectrum resource, if the communication device starts transmitting a signal on the channel of the preset spectrum resource, and goes through a fixed frame of the communication device The long-term end point is in the subframe M; then, the time period from when the user equipment experiences the channel of the preset spectrum resource, when the user equipment experiences the fixed frame of the user equipment for a long time When the time interval of the channel CSI is not coincident with the channel idle evaluation window of the subframe M, the starting point of the next CCA performed by the user equipment is the starting point of the channel idle evaluation window of the subframe M;

Starting from the communication device transmitting a signal on the channel of the preset spectrum resource, a time period used by the communication device to complete a fixed frame of the communication device for a long time coincides with a channel idle evaluation window of the subframe M Time, the communication device performs the next CCA starting point in the subframe

The starting point of the channel idle evaluation window for M+1.

As shown in Figure 1, the communication device follows the multipoint access/avoidance machine within the last T seconds of the system subframe. The channel idle evaluation CCA is made, and the τ second time range is called a "channel idle evaluation window". As shown in FIG. 1, the length of the "channel idle evaluation window" is τ seconds, and the length of two OFDM symbols is taken as an example.

Each communication device stores a time count value parameter N' in a sub-frame of CCA, where *r _CCA ≤ T, and T _CCA is the length of time of each _CCA of each communication device. The ^T ccA of each communication device may be the same or different, and ^T cc _{A of} device X is denoted as ^T xc _CA , where ^{≥ 20} ^. When the CCA is first used, the time count value of each communication device in the subframe where the CCA is located is set to

The device starts CCA at the starting point of the "channel idle evaluation window" of Subframe#N, and when the channel detecting the preset spectrum resource is occupied, or the number of times the CCA is executed reaches the CCA count value of the device in the subframe, CCA End.

The time for executing the CCA is the product of ^ and X, and X is the number of times the communication device performs CCA in the channel idle evaluation window;

There are two cases based on the results of the channel idle evaluation:

In the first case, if the number of times the communication device performs CCA in Subframe#N does not reach the CCA count value of the communication device in the subframe, that is, the channel in which the preset spectrum resource is detected is occupied, the communication device stops. CCA, and set the time count value in the next CCA Subframe to the count value in Subframe# N - the number of times the device does CCA in Subframe#N.

The next time the communication device does CCA is determined by the time end point of the current CCA and the length of the "fixed frame long time" of the communication device. The length of time from the end of the communication device's current CCA time to the time when the communication device next makes CCA is called the current "idle time" of the communication device. The length of the "idle time" is always greater than or equal to the length of the "fixed frame long time" of the communication device. Assume that the communication device is in Subframe# ⁿ . When the CCA is detected, the channel that detects the preset spectrum resource is occupied, and after the time of the "fixed frame for a long time" of the communication device is

Subframe# ^η ι Subframe time. As shown in Figure 2, the length of the "idle time" of the communication device has the following possibilities: Possibility one: From the communication device in Subframe# ⁿ . When the CCA detects that the channel of the preset spectrum resource is occupied, the time range of the "fixed frame long time" of the communication device is experienced.

If the "channel idle evaluation window" of the Subframe ^#n i subframe has no coincidence time, the next subframe in which the communication device performs the CCA is in the "channel idle evaluation window" of the Subframe# ^η ι subframe. The length of the "idle time" is that the communication device starts at a time when Subframe#1 detects that the channel of the preset spectrum resource is occupied, and ends at the beginning of the "channel idle evaluation window" of the Subframe# ⁿ i subframe;

Possibility 2: From the communication device in Subframe# ⁿ . When the CCA detects that the channel of the preset spectrum resource is occupied, and the time range of the "fixed frame long time" of the communication device and the "channel idle evaluation window" of the Subframe ^#n i subframe overlap, the communication is performed. The next subframe in which the device performs CCA is in the "Channel Idle Evaluation Window" of the Subframe ^#n i ^{+ 1} subframe. The length of "idle time" is the communication device in Subframe# ⁿ . The time when the channel for detecting the preset spectrum resource is occupied is started, and the start of the "channel idle evaluation window" of the Subframe ^#n i ^{+ 1} subframe ends.

As shown in FIG. 3, in the second case, if the communication device detects that the channel of the preset spectrum resource is idle, if the number of times the communication device performs CCA in the Subframe#N reaches the CCA count value of the communication device in the subframe, The communication device begins transmitting data on the channel of the detected preset spectrum resource. The communication device sends a certain fill signal before scheduling the data transmission. The channel in which the communication device can be scheduled according to the data of the system in units of subframe scheduling, and the channel in which the spectrum resource is preset before the communication device schedules data transmission is not occupied by other communication devices. As shown in Figure 3,

At the same time, the communication device starts the detected preset spectrum because the communication device detects that the channel of the preset spectrum resource is idle when the number of times the CCA is performed in the Subframe#N reaches the CCA count value of the communication device in the subframe. Data is sent on the channel of the resource. According to the frame-based communication device (Frame based equipment), the requirement of occupying and releasing channel resources is required, and the time when the communication device occupies the channel of the preset spectrum resource is the channel occupancy time of the communication device. Inter. "The product ^Τ ∞ CCA count value of the communication device in Subframe # N and the apparatus _Α and the communication device is" busy time of the channel ", may determine that the communication device the occupier predetermined spectrum resources channel The time during which the useful signal is transmitted. Thus, in the subframe in which the communication device ends the signal transmission end, the length of time that the communication device occupies the channel transmission signal of the preset spectrum resource may be an indeterminate value, so The communication device needs to notify the receiver of the transmission signal of the length of time that the subframe transmits the signal of the preset spectrum resource in the subframe or whether the signal transmitted by the communication device in the subframe occupying the preset spectrum resource is valid.

The time when the communication device next performs the CCA is related to the time after the time when the communication device transmits the signal of the preset spectrum resource and experiences the "fixed frame time" of the communication device. Assume that the communication device is in Subframe# ⁿ . The time when the channel transmission signal occupying the preset spectrum resource starts to pass through the time period of the "fixed frame long time" of the communication device is the time of the Subframe ^#n i subframe, and the following possibilities are possible:

Possibility One: From the communication device in Subframe# ⁿ . When the channel transmission signal occupying the preset spectrum resource starts, and the time range of the "fixed frame long time" of the communication device and the "channel idle evaluation window" of the subframe ^#n i subframe do not coincide, the communication device does the next time. The subframe of the CCA is within the "channel idle evaluation window" of the Subframe ^#n i subframe.

Possibility 2: From the communication device in Subframe# ⁿ . When the channel transmission signal occupying the preset spectrum resource starts, and the time range of the "fixed frame long time" of the communication device and the "channel idle evaluation window" of the Subframe ^#n i subframe overlap, the communication device does the next time. The subframe of the CCA is within the "channel idle evaluation window" of the Subframe ^#n i ^{+ 1} subframe.

The method provided by the embodiment of the present invention is described below in a more specific embodiment, assuming N. =1G, the T _{CCA of} multiple communication devices is the same. In the "channel idle evaluation window" of Subframe #1, the communication device A, the communication device ^ the communication device C all do CCA, and the communication devices A, B, C have the CCA count value ^N '" of Subframe #1, ^Ν ' ^Β ', ^Ν ''5,4,9 respectively As shown in FIG. 5, when the communication device A counts down 4 units of the time of the CCA, the communication device A detects that the channel of the preset spectrum resource is occupied, stops the CCA, and sets the time count value of the next CCA to be 5 - 4 = 1 ;

The communication device B detects that the channel of the preset spectrum resource is idle when the CCA time counts down in 4 units, starts transmitting data on the detected channel, and sets the time count value of the next CCA to 10;

When the communication device C counts 4 units of the CCA time in Subframe#1, when the channel detecting the preset spectrum resource is occupied, the CCA is stopped, and the time count value of the next CCA is set to 9 - 4 = 5;

For communication device A, there are two possibilities for the next #CCA time:

Possibility one: starting from the time when the communication device A detects that the channel of the preset spectrum resource is occupied when the Subframe# is done as the CCA, and after the time of the "fixed frame for a long time" of the communication device, within the time range of the Subframe#n, And, when the range of the time of the "fixed frame long time" of the communication device and the "channel idle evaluation window" of the Subframe#n subframe do not coincide, the next time the communication device A performs the CCA subframe from Subframe#n The beginning of the "Channel Idle Evaluation Window" begins. The length of the "idle time" is that the communication device A starts at the time when Subframe#1 detects that the channel of the preset frequency resource is occupied, and ends at the "channel idle evaluation window" of the Subframe#n subframe;

Possibility 2: When the communication device A detects that the channel of the preset spectrum resource is occupied when the Subframe# is done as the CCA, and after the time of the "fixed frame for a long time" of the communication device, it is within the time range of the Subframe#n. And when there is a coincidence time between the range of the time when the "fixed frame long time" of the communication device is experienced and the "channel idle evaluation window" of the Subframe#n subframe, the next time the communication device A makes the CCA subframe from Subframe#n The start of the "channel idle evaluation window" of the +1 subframe starts. The length of the "idle time" is the "channel idle evaluation window" of the Subframe#n+1 subframe when the communication device A starts to occupy the channel where the preset spectrum resource is occupied by the Subframe#1. The mouth "the beginning of the end.

For communication device B:

When the communication device B detects that the channel of the preset spectrum resource is idle when the number of CCAs in the Subframe#1 reaches the communication device in the subframe, the communication device starts transmitting data on the detected shared channel. Before Subframe #2, communication device B may need to send a certain padding signal before sending, so that the communication device can schedule in the subframe scheduling according to the data scheduling of the system, before Subframe#2 schedules the data, The channel of the preset spectrum resource is not occupied by other communication devices. The time point after the communication device B starts to experience the "channel occupation time" of the communication device after the Subframe#1 transmits the signal may be in the Subframe#x subframe, and the communication device B may occupy the channel of the preset spectrum resource in Subframe#x. The time at which the channel is transmitted is related to the "channel occupancy time" of the time at which the signal is transmitted. The communication device B needs to notify the signal receiving communication device when Subframe#x occupies the channel transmission channel of the pre-set spectrum resource. Or the communication device B notifies the signal receiving communication device whether the signal transmitted by the shared channel in the Subframe #x is valid.

As shown in FIG. 7, there are two possibilities for the communication device B to perform the CCA next time: Possibility 1: Starting from the communication device B, the Subframe#1 transmits the signal of the channel occupying the preset spectrum resource, and experiences the communication device. The time after the fixed frame is "long" is within the time range of Subframe#n, and the range of the time of experiencing the "fixed frame long time" of the communication device does not coincide with the "channel idle evaluation window" of the Subframe#n subframe. At the time, the next subframe in which the communication device B makes the CCA starts from the beginning of the "channel idle evaluation window" of Subframe#n.

Possibility 2: starting from the transmission signal of the communication device B in the Subframe#1 occupying the preset spectrum resource, after experiencing the "fixed frame long time" of the communication device, within the time range of the Subframe#n, and undergoing the The time range of the "fixed frame long time" of the communication device coincides with the "channel idle evaluation window" of the Subframe#n subframe, and the next time the communication device B performs the CCA subframe from the Subframe#n+1 subframe. The beginning of the "Channel Idle Evaluation Window" begins. According to the above embodiment, each communication device determines the time for the device to perform CCA according to the multi-point access/avoidance mechanism in the "channel idle evaluation window" of the same subframe, so that the device can be made according to the frame based equipment. When the mechanism is required to occupy and release the resources of the unlicensed spectrum channel, the time synchronization between multiple devices can ensure that the opportunities for each device occupy the channel are as equal as possible, and the problem of occupying channel conflicts is reduced.

Correspondingly, as shown in FIG. 8, an embodiment of the present invention provides a communications device, where the communications device includes:

The channel idle evaluation unit 801 is configured to perform channel idle evaluation CCA on the channel of the preset spectrum resource at a start point of the channel idle evaluation window of the system subframe N, and the channel idle evaluation window time length of the system subframe N For T seconds, the CCA count value N', N' of the communication device in system subframe N is the maximum number of times the communication device is performing CCA in system subframe N. The channel idle evaluation unit performs the CCA process, and when the communication device does not reach the channel idle evaluation count value of the current subframe in the system subframe N, the number of times the system does not reach the channel idle evaluation count value of the current subframe If the channel of the spectrum resource is occupied, the communication device determines that the channel of the preset spectrum resource is occupied, and ends the evaluation of the channel idle state of the preset spectrum resource;

When the communication device performs CCA times in the system subframe N to reach the channel idle evaluation count value of the communication device in the current subframe, the channel idle evaluation unit determines 801 that the channel of the preset spectrum resource is idle;

The transmitting unit 802 is configured to transmit data that needs to be transmitted in the shared channel.

The preset spectrum resource has the following features: the usage of the channel that needs to listen to the preset spectrum resource before occupying the channel of the preset spectrum resource, and the occupation time of the channel occupying the preset spectrum resource is limited. .

Optionally, the channel idle estimation unit 801 evaluates the preset spectrum when the number X of times the communication device performs CCA in the system subframe N does not reach the channel idle evaluation count value of the current subframe in the current subframe. When the channel of the resource is occupied, N'-x is used as the device to perform CCA next time. The CCA count value of the sub-frame.

Optionally, the channel idle estimation unit 801 determines that the channel of the preset spectrum resource is idle and at the preset in the system subframe f CCA times reaches a channel idle evaluation count value of the communication device in the current subframe. After transmitting the data to be transmitted in the channel of the spectrum resource, N _{Q is} used as the CCA count value of the subframe in which the device performs CCA next time. The N _Q is the CCA count value of the subframe of the CCA for all the communication devices that perform channel competition of the preset spectrum resources in the system for the first time.

Optionally, the channel state estimation unit 801 estimates that the channel to the preset spectrum resource is occupied before the number of times the system subframe f CCA does not reach the channel idle evaluation count value of the current subframe in the current subframe. Evaluating from the channel state estimation unit that the channel of the preset spectrum resource is occupied, and ending in a fixed frame of the communication device for a long time is in the subframe M;

When the time period during which the communication device has experienced the fixed frame of the communication device is coincident with the channel idle evaluation window of the subframe M, the channel state estimating unit performs the next CCA starting point as The starting point of the channel idle evaluation window for subframe M+1.

Preferably, if the transmission unit 802 starts transmitting a signal on the channel of the preset spectrum resource, and the end point of the fixed frame that has experienced the long time of the communication device is in the subframe M, The transmission unit starts at a channel transmission signal of the preset spectrum resource, and the time period used by the communication device to complete the fixed frame of the communication device does not coincide with the channel idle evaluation window of the subframe M. The channel estimation unit 801 is the starting point of the channel idle evaluation window of the subframe M when the starting point of the next CCA is performed;

If the transmission unit starts transmitting a signal on the channel of the preset spectrum resource, the time period used by the communication device to complete the fixed frame of the communication device for a long time and the message of the subframe M When the channel idle evaluation window has coincidence time, the channel estimation unit 801 performs the next starting point of the CCA as the starting point of the channel idle evaluation window of the subframe M+1.

Preferably, the communication device further includes a padding unit, a padding signal sent before the scheduling data is sent, and the padding signal is a random signal that is sent by occupying the shared channel.

In this embodiment, the channel idle evaluation window is the last T seconds or the initial T seconds of a system subframe.

With the above-mentioned embodiment, each communication device determines the time for the LTE device to perform CCA according to the multi-point access/avoidance mechanism in the "channel idle evaluation window", and can make the LTE device follow the frame based equipment after listening. When the mechanism requires that the resources of the unlicensed spectrum channel be occupied and released, in the case of time synchronization between multiple LTE devices, it is possible to ensure that the opportunities for each device occupying the channel are as equal as possible, and the problem of occupying channel conflicts is reduced.

As shown in FIG. 9, an embodiment of the present invention provides a communication device. The embodiment includes a transceiver 91, a processor 92, and a memory 93. The system bus 94 is used to connect the network interface 91, the processor 92, and the memory 93.

The transceiver 91 is for communicating with a base station or the like.

The memory 93 may be a persistent storage such as a hard disk drive and a flash memory having a software module and a device driver. The software modules are capable of executing the various functional modules of the above described method of the present invention; the device drivers can be network and interface drivers.

At startup, these software components are loaded into memory 93 and then accessed by processor 92 and executed as follows:

The processor starts at the beginning of the channel idle evaluation window of the system subframe N, and starts to the preset spectrum The channel of the resource performs channel idle evaluation CCA, the channel idle evaluation window time length of the system subframe N is T seconds, and the CCA count value N', N' of the communication device in the system subframe N is the communication device. The maximum number of times CCA is executed within system subframe N.

The processor determines the pre-determination when the processor evaluates that the channel to the preset spectrum resource is occupied before the number of times the system subframe N performs CCA does not reach the communication device's channel idle evaluation count value of the current subframe. Setting the channel of the spectrum resource to be occupied, and ending the evaluation of the channel idle state of the preset spectrum resource;

Determining, by the transceiver, that the channel of the preset spectrum resource is idle, when the processor performs CCA times in the system subframe N to reach a channel idle evaluation count value in the current subframe of the communication device, Transmitting data to be transmitted in a channel of a preset spectrum resource;

Preferably, when the number X of CCAs performed by the processor in the system subframe N does not reach the channel where the predetermined spectrum resource is occupied before the communication device evaluates the channel idle evaluation count value of the current subframe, N'-x is the CCA count value of the subframe in which the device performs CCA next time.

Preferably, the processor 92 determines that the channel of the preset spectrum resource is idle and is in the preset spectrum when the number of CCAs in the system subframe N reaches the channel idle evaluation count value in the current subframe of the communication device. After the data to be transmitted is transmitted in the channel of the resource, it will be used as the CCA count value of the next subframe in which the device performs CCA, and all the communication devices that perform channel competition of the preset spectrum resource in the system do the subframe of the CCA for the first time. CCA count value.

Preferably, the processor 92 determines that the shared channel is idle, and after the transceiver transmits the data to be transmitted in the shared channel, the channel idle evaluation value when the user equipment performs the CCA next time is determined. When the initial CCA is set, the time count initial value No of all user equipments that share the channel competition in the LTE system. Preferably, the processor 92 performs the CCA number in the system subframe N to reach the channel idle evaluation count value of the communication device in the current subframe, and determines that the channel of the preset spectrum resource is idle and in the preset spectrum resource. After transmitting the data to be transmitted in the channel, it will be the CCA count value of the subframe in which the device performs CCA next time, N. The CCA count value of the subframe of the CCA is first performed for all communication devices that perform channel competition of the preset spectrum resources in the system.

Preferably, the processor 92 evaluates the channel of the preset spectrum resource before the number of times the communication device performs CCA in the system subframe N does not reach the channel idle evaluation count value of the current subframe in the current subframe. Occupied, if the channel from which the communication device evaluates to the preset spectrum resource is occupied, and the end point of the fixed frame that has experienced the long time of the communication device is in the subframe M;

When the time period during which the communication device has experienced the fixed frame of the communication device is not coincident with the channel idle evaluation window of the subframe M, the processor 92 executes the next CCA starting point as the starting point. Describe the starting point of the channel idle evaluation window of the subframe M;

When the communication device has experienced a time period in which the fixed frame of the communication device is used for a long time coincides with the channel idle evaluation window of the subframe M, the processor 92 performs the next start point of the CCA as a child. The starting point of the channel idle evaluation window for frame M+1.

Preferably, the transceiver 91 transmits the data to be transmitted in the shared channel, if the transceiver 91 sends a signal from the channel of the preset spectrum resource, to a fixed frame of the communication device. The long end point is in the subframe M, B'J,

If the transceiver device 91 transmits a signal on the channel of the preset spectrum resource, the time period used by the communication device to complete the fixed frame of the communication device for a long time and the channel idle evaluation window of the subframe M When there is no coincidence time, the processor 92 performs a starting point of the next CCA as the starting point of the channel idle evaluation window of the subframe M;

If the transceiver device 91 transmits a signal on the channel of the preset spectrum resource, the time period used by the communication device to complete the fixed frame of the communication device for a long time and the message of the subframe M When the channel idle evaluation window has coincident time, the processor 92 executes the starting point of the next CCA as the starting point of the channel idle evaluation window of the subframe M+1.

Preferably, when the processor determines that the shared channel is idle, and transmits data to be transmitted in the shared channel by using the transceiver, the method further includes:

a padding signal sent by the transceiver before scheduling data transmission, the padding signal being a random signal transmitted occupying a shared channel.

Preferably, the transceiver 91 notifies the receiver of the signal that the notification carries the length of time that the communication device uses the signal transmitted in the last subframe of the channel transmission signal of the preset spectrum resource, or the communication device occupies The information of whether the signal transmitted in the last subframe of the channel transmission signal of the preset spectrum resource is valid.

In this embodiment, the channel idle evaluation window is the last T seconds or the first T seconds of a system subframe.

A person skilled in the art should further appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, in order to clearly illustrate hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

The steps of the method or algorithm described in connection with the embodiments disclosed herein may be implemented in hardware, processing The software module executed by the device, or a combination of the two. Software modules can be placed in random access memory

(RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage known in the art. In the medium.

The above described embodiments of the present invention are further described in detail, and the embodiments of the present invention are intended to be illustrative only. The scope of the protection, any modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Claim

A method for detecting and occupying a preset spectrum resource, the method comprising: the communication device starts performing channel idle on a channel of the preset spectrum resource at a starting point of a channel idle evaluation window of the system subframe N Evaluating CCA, the channel idle evaluation window time length of the system subframe N is T seconds, and the CCA count value N', N' of the communication device in the system subframe N is the communication device in the system subframe N The maximum number of times the CCA is executed;

2. The method according to claim 1, wherein: when the number X of times the communication device performs CCA in the system subframe N does not reach the channel before the communication device evaluates the channel idle evaluation count value of the current subframe When the channel of the preset spectrum resource is occupied, N'-x is used as the CCA count value of the subframe in which the device performs CCA next time.

The method according to claim 1, wherein the communication device determines the preset spectrum resource by performing a CCA number in the system subframe N and a channel idle evaluation count value in the current subframe of the communication device. After the channel is idle and transmits the data to be transmitted in the channel of the preset spectrum resource, it will be the CCA count value of the subframe in which the device performs CCA next time, and N _Q is the channel in the system for performing the preset spectrum resource. All the communication devices that compete for the first time do the subframe of CCA CCA count value.

The method according to claim 1 or 2, wherein, when the number of times the communication device performs CCA in the system subframe N does not reach before the communication device evaluates the channel idle evaluation count value of the current subframe The channel of the preset spectrum resource is occupied. If the channel from which the communication device evaluates to the preset spectrum resource is occupied, the end point of the fixed frame that has experienced the long time of the communication device is in the subframe M. ; 贝'J,

The method according to claim 1 or 3, characterized in that, if the communication device starts transmitting a signal on a channel of the preset spectrum resource, the end of the fixed frame of the communication device is completed. Point in subframe M, Bay 'J,

6. The method according to any one of claims 1, 3, and 5, wherein when it is determined that the channel of the preset spectrum resource is idle, and the data to be transmitted is transmitted in the shared channel, further Steps include:

7. The method of claim 6, further comprising:

The communication device notifies the receiver of the signal that the notification carries the time length of the signal sent by the communication device in the last subframe of the channel transmission signal of the preset spectrum resource, or the communication device occupies the preset spectrum resource The channel transmits information about whether the transmitted signal in the last subframe of the signal is valid.

8. The method of claim 1, wherein the channel idle evaluation window is the last T seconds or the first T seconds of a system subframe.

9. A communication device, comprising:

a channel idle evaluation unit, configured to perform channel idle evaluation CCA on a channel of the preset spectrum resource at a start point of a channel idle evaluation window of the system subframe N, where a channel idle evaluation window time length of the system subframe N is T seconds, the CCA count value N ', N ' of the communication device in the system subframe N is the maximum number of times the communication device performs CCA in the system subframe N;

The preset spectrum resource has the following features: the usage of the channel that needs to listen to the preset spectrum resource before occupying the channel of the preset spectrum resource, and the preset spectrum resource is occupied once. The channel takes up a limited amount of time.

10. The communication device according to claim 9, wherein the channel idle estimation unit does not reach the channel idle time in the current subframe when the communication device does CCA in the system subframe N. When evaluating the count value before evaluating the channel to the preset spectrum resource is occupied, N'-x is taken as the CCA count value of the subframe in which the device performs CCA next time.

The user equipment according to claim 10, wherein the channel idle estimation unit determines that the number of CCAs in the system subframe N reaches a channel idle evaluation count value in the current subframe of the communication device, and determines the pre-determination After the channel of the spectrum resource is idle and the data to be transmitted is transmitted in the channel of the preset spectrum resource, it will be the CCA count value of the subframe in which the device performs CCA next time, N. For all communication devices that perform channel competition for preset spectrum resources in the system, the CCA count value of the CCA subframe is first made.

12. The communication device according to claim 9, wherein: when the channel state estimating unit does not perform CCA in the system subframe N, the number of times before the channel idle evaluation count value of the current subframe in the current subframe is not reached. Assessing that the channel of the preset spectrum resource is occupied, if the channel estimated by the channel state estimation unit to the preset spectrum resource is occupied, the end point of the fixed frame that has experienced the communication device is long Subframe M; Bay 'J,

13. The communication device according to claim 12, wherein if the transmission unit starts transmitting a signal on the channel of the preset spectrum resource, the end point of the fixed frame that has experienced the communication device is long In sub-frame M, Bay 'J, If the transmission unit starts transmitting a signal on the channel of the preset spectrum resource, the time period used by the communication device to complete the fixed frame of the communication device for a long time and the channel idle evaluation window of the subframe M are not At the time of coincidence, the starting point of the channel estimation unit performing the next CCA is the starting point of the channel idle evaluation window of the subframe M;

The communication device of claim 9, further comprising:

The communication device of claim 15, further comprising:

16. The communication device of claim 9, wherein the channel idle evaluation window is the last T seconds or the first T seconds of a system subframe.

17. A communication device, the communication device comprising:

Transceiver

Processor

Memory

The processor starts at the beginning of the channel idle evaluation window of the system subframe N, and starts to the preset spectrum The channel of the resource performs channel idle evaluation CCA, the channel idle evaluation window time length of the system subframe N is T seconds, and the CCA count value N', N' of the communication device in the system subframe N is the communication device. The maximum number of times CCA is executed in system subframe N;

18. The communication device according to claim 17, wherein the number of times X of the processor performing CCA in the system subframe N is not up to the value of the channel idle evaluation count value of the current subframe in the current subframe. When the channel of the preset spectrum resource is occupied, N'-X is used as the CCA count value of the subframe in which the device performs CCA next time.

The communication device according to claim 18, wherein the processor performs CCA times in the system subframe N to reach a channel idle evaluation count value of the communication device in the current subframe, and determines the preset spectrum. After the channel of the resource is idle and the data to be transmitted is transmitted in the channel of the preset spectrum resource, it will be the CCA count value of the subframe in which the device performs CCA next time, and N ₀ is the channel for performing preset spectrum resource in the system. All the communication devices that competed for the first time made the CCA count value of the subframe of the CCA.

20. The communication device according to claim 17, wherein the processor does not reach a letter in the current subframe of the communication device when the communication device does CCA in the system subframe N. The channel that is estimated to the preset spectrum resource is occupied before the channel idle evaluation count value, if the channel from which the predetermined spectrum resource is estimated to be occupied from the communication device starts, and the fixed frame of the communication device is experienced for a long time End point in sub-frame M;

When the time period during which the communication device has experienced the fixed frame of the communication device is not coincident with the channel idle evaluation window of the subframe M, the processor performs the next CCA starting point as described The starting point of the channel idle evaluation window of subframe M;

21. The communication device according to claim 20, wherein, if the transceiver transmits a signal on a channel of the preset spectrum resource, the end point of the fixed frame that has experienced the communication device is long In sub-frame M, Bay 'J,

The communication device according to claim 17, wherein the transceiver transmits a padding signal before scheduling data transmission, and the padding signal is a random signal transmitted by occupying a shared channel.

The communication device according to claim 22, wherein the transceiver notifies a receiver of the signal that the notification carries a channel transmission signal that the communication device occupies a preset spectrum resource The length of time of the signal transmitted in the last subframe, or the information of whether the signal transmitted in the last subframe of the channel transmission signal of the preset spectrum resource occupies the validity of the signal.

24. The communication device of claim 17, wherein the channel idle evaluation window is the last T seconds or the first T seconds of a system subframe.