WO2013137702A1

WO2013137702A1 - Apparatus and method for selecting communication path in wireless communication system for supporting multi-radio access technology

Info

Publication number: WO2013137702A1
Application number: PCT/KR2013/002202
Authority: WO
Inventors: 이정석; 장동석; 이현석; 이동찬; 장한종; 이학용
Original assignee: 주식회사 씨에스
Priority date: 2012-03-16
Filing date: 2013-03-18
Publication date: 2013-09-19
Also published as: KR20130105059A

Abstract

The present invention relates to a method for selecting a communication path in a communication path selection apparatus of a wireless communication system for supporting multi-Radio Access Technology (RAT), comprising the steps of: determining at least one performance cost determined according to a corresponding performance cost parameter with respect to each corresponding communication path; and selecting at least one communication path by using at least one performance cost determined with respect to each corresponding communication path.

Description

Apparatus and method for selecting a communication path in a wireless communication system supporting multi-radio access technology

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for selecting a communication path in a wireless communication system supporting a multi-radio access technology (hereinafter referred to as " Multi RAT ").

Typical examples of the mobile communication system include a Wideband Code Division Multiple Access (WCDMA) communication system and an Long Term Evolution (LTE) Speed and high-capacity services to user equipment (UE) (hereinafter, referred to as UE).

In particular, recently, UEs requiring high-speed and high-capacity services such as smart phones have been exploding. In this way, as the UEs requiring high-speed and high-capacity services are explosively deployed, the amount of data traffic is also explosively increasing. Therefore, the load of the mobile communication system and the burden of the UE's charge on the mobile communication system are reduced A WLAN system such as a wireless local access network (WLAN) system, e.g., a WiFi system, is used in parallel.

On the other hand, since the WiFi system does not generate a usage fee and the data transmission speed is higher than that of the mobile communication system, the UE does not support the mobility of the UE, so that the UE can receive data service through the WiFi system It becomes impossible.

In addition, the WiFi system does not generate a usage fee and has a higher data transmission rate than the mobile communication system, while the UE scans an access point (AP) Or standby mode, energy consumption is high, and when a connection with a new AP is performed, it is troublesome and connection delay to input user information of the UE.

Therefore, the user of the UE selects a mobile communication system or a WiFi system according to his / her situation and is provided with a data service. However, this may inconvenience a user who has to directly select a mobile communication system or a WiFi system.

Therefore, the mobile communication system and the WiFi service are provided so as to minimize the usage fee and energy consumption, to prevent the user information input for performing the new AP connection and to delay the connection of the new AP, There is a need for a method of selecting a communication path so that a system can be adaptively selected or used in parallel to receive a data service.

The present invention proposes a communication path selecting apparatus and method in a wireless communication system supporting Multi RAT.

In addition, the present invention proposes a communication path selecting apparatus and method for minimizing data loss in a wireless communication system supporting Multi RAT.

Also, the present invention proposes a communication path selecting apparatus and method for minimizing a connection delay time in a wireless communication system supporting Multi RAT.

In addition, the present invention proposes a communication path selecting apparatus and method for minimizing usage charge and energy consumption in a wireless communication system supporting Multi RAT.

Also, the present invention proposes a communication path selecting apparatus and method for preventing user information input and new AP connection delay for performing a new AP connection in a wireless communication system supporting Multi RAT.

The apparatus proposed in the present invention comprises: In a communication path selection device of a wireless communication system supporting Multi RAT (Radio Access Technology), at least one performance cost determined corresponding to a performance cost parameter for each communication path is determined And a Multi Radio Access Technology (RAT) convergence sub-layer unit for selecting at least one communication path using at least one performance cost determined for each of the corresponding communication paths, .

The method proposed by the present invention comprises: A method for selecting a communication path in a communication path selection device of a wireless communication system supporting Multi RAT (Radio Access Technology), the method comprising the steps of: And selecting at least one communication path using at least one performance cost determined for each of the communication paths.

The present invention makes it possible to automatically select a communication path in a wireless communication system supporting Multi RAT. Accordingly, it is an object of the present invention to provide a wireless communication system that minimizes data loss and minimizes usage fees and energy consumption without requiring a user to directly select a system in a wireless communication system supporting Multi RAT, Information input and new AP connection delay can be prevented.

1 schematically shows a structure of a wireless communication system supporting Multi RAT according to an embodiment of the present invention;

FIG. 2 is a view showing the internal structure of the hybrid terminal 110 of FIG. 1

FIG. 3 is a view showing the internal structure of the complex base station 120 of FIG. 1

FIG. 4 schematically shows an operation process of the Multi RAT convergence sub-layer unit; FIG.

5 is a diagram schematically illustrating an operation procedure of a hybrid terminal in a wireless communication system supporting Multi RAT according to an embodiment of the present invention.

6 is a diagram schematically illustrating an operation procedure of a complex base station in a wireless communication system supporting Multi RAT according to an embodiment of the present invention;

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The present invention proposes a communication path selecting apparatus and method in a wireless communication system supporting a multi-radio access technology (hereinafter referred to as 'Multi RAT').

In addition, the present invention proposes a communication path selecting apparatus and method for minimizing data loss in a wireless communication system supporting Multi RAT. In addition, the present invention proposes a communication path selecting apparatus and method for minimizing a connection delay time in a wireless communication system supporting Multi RAT.

Meanwhile, the RATs used in the wireless communication system include a mobile communication technology and a wireless local area network (WLAN) technology, and the mobile communication technology includes, for example, a wideband code division multiple access (WCDMA) (WCDMA) technology, Code Division Multiple Access (CDMA) technology, Long-Term Evolution (LTE) technology, Mobile WiMAX (Worldwide Interoperability for Microwave Access) technology, and the WLAN technology includes WiFi technology. Hereinafter, for convenience of explanation, it is assumed in the embodiment of the present invention that the wireless communication system uses WCDMA technology as a mobile communication technology and supports WiFi technology as a WLAN technology.

In the present invention, the case where the wireless communication system supports two RATs, that is, a WCDMA technology and a WiFi technology will be described as an example. However, the present invention provides a data providing apparatus and method, It is obvious that the present invention can be applied as it is.

1 is a diagram schematically illustrating a structure of a wireless communication system supporting Multi RAT according to an embodiment of the present invention.

Referring to FIG. 1, the wireless communication system supporting the Multi RAT includes a hybrid terminal 110, a hybrid access point 120, a router 130, a home network 140, a backhaul network 150, a core network (CN) 160, a public network 170, and a network server 180. The internal structure of the hybrid terminal 110 will be described below with reference to FIG. 2. Therefore, a detailed description thereof will be omitted herein. The internal structure of the hybrid base station 120 will be described below with reference to FIG. 3 The detailed description thereof will be omitted here. In addition, the home network 140 includes home network devices 141 and 143.

Next, the internal structure of the hybrid terminal 110 of FIG. 1 will be described with reference to FIG.

2 is a diagram illustrating an internal structure of the hybrid terminal 110 of FIG.

2, the hybrid terminal 110 includes an application layer unit 211, a Transmission Control Protocol / Internet Protocol (TCP / IP) A Multi-RAT convergence sub-layer unit 215, a WCDMA layer unit 217, and a WiFi layer unit 219 (hereinafter referred to as " TCP / IP " . When detecting that it is necessary to select a communication path, the Multi RAT Convergence Sub-layer unit 215 transmits a communication path to be used in the hybrid terminal 110 by using a predetermined communication path selection algorithm at least 1 And transmits information on the selected communication path to the composite base station 120 via the corresponding communication path. Here, the Multi RAT convergence sub-layer unit 215 needs to select a communication path when it is requested to satisfy a predetermined communication path selection criterion or to select a communication path from the complex base station 120 And a detailed description of the communication path selection criterion will be omitted. The detailed operation of selecting the communication path by the Multi RAT convergence sub-layer unit 215 will be described below with reference to FIG. 4, and a detailed description thereof will be omitted here.

2 shows a case where the Multi RAT convergence sub-layer unit 215 of the hybrid terminal 110 directly selects a communication path to be used in the hybrid terminal 110. However, The multi RAT convergence sub-layer unit 215 of the hybrid base station 120 does not directly select the communication path to be used in the hybrid terminal 110, It is also possible to select a communication path to be used. When the multi RAT convergence sub-layer unit 311 of the hybrid base station 120 selects a communication path to be used by the hybrid terminal 110, the Multi RAT convergence sub-layer unit 311 transmits the combined The hybrid terminal 110 may transmit information on the communication path selected by the terminal 110 and may select the communication path by receiving the communication path.

In addition, the Multi RAT convergence sub-layer unit 215 may select a communication path by determining that a direct communication path selection is required, and may select a communication path according to the control of the complex base station 120, It is needless to say that the communication path can be selected correspondingly.

2, the application layer unit 211, the TCP / IP layer unit 213, the Multi RAT convergence sub-layer unit 215, the WCDMA layer unit 217, and the WiFi layer unit 219 The application layer unit 211, the TCP / IP layer unit 213, the Multi RAT convergence sub-layer unit 215 and the WCDMA layer unit 217 ), And the WiFi layer unit 219 may be integrated into one unit.

Next, the internal structure of the complex base station 120 of FIG. 1 will be described with reference to FIG.

3, the hybrid access point 120 includes a Multi RAT convergence sub-layer unit 311, a WiFi layer unit 313, and a WCDMA layer unit 315. When detecting that it is necessary to select a communication path, the Multi RAT Convergence Sub-layer unit 311 selects at least one communication path to be used in the hybrid terminal 110 using a preset communication path selection algorithm, And transmits information on the selected communication path to the hybrid terminal 110 via the communication path. Here, the Multi RAT convergence sub-layer unit 311 needs to select a communication path when it meets a predetermined communication path selection criterion or when it is requested to select a communication path from the hybrid terminal 110 And a detailed description of the communication path selection criterion will be omitted. The detailed operation of the Multi RAT convergence sub-layer unit 311 for selecting a communication path will be described below with reference to FIG. 4, and therefore a detailed description thereof will be omitted here.

3 illustrates a case where the Multi RAT convergence sub-layer unit 311 of the hybrid base station 120 directly selects a communication path to be used in the hybrid terminal 110. However, in the hybrid base station 120, The Multi RAT convergence sub-layer unit 311 of the hybrid terminal 110 does not directly select the communication route to be used in the hybrid terminal 110 but the Multi RAT convergence sub- 110 may select a communication path to be used. When the multi RAT convergence sub-layer unit 215 of the hybrid terminal 110 selects a communication path to be used by the hybrid terminal 110, the Multi RAT convergence sub-layer unit 215 transmits the combined It is also possible to transmit the information on the communication path selected by the base station 120 and allow the compound BS 120 to select the communication path.

In addition, the Multi RAT convergence sub-layer unit 311 may select a communication path by determining that a direct communication path selection is required, and may select a communication path according to a request of the hybrid terminal 110, It is needless to say that the communication path may be selected correspondingly.

3, the Multi RAT convergence sub-layer unit 311, the WiFi layer unit 313, and the WCDMA layer unit 315 are implemented as separate units. However, the Multi RAT convergence sub- The sub-layer unit 311, the WiFi layer unit 313, and the WCDMA layer unit 315 may be integrated into one unit.

Next, the operation of the Multi RAT convergence sub-layer unit will be described with reference to FIG.

4 is a diagram schematically illustrating an operation process of the Multi RAT Convergence Sub-layer unit.

4, the operation procedure of the Multi RAT Convergence Sub-layer unit 411 described in FIG. 4 is the same as the Multi RAT Convergence Sub-layer unit 215 of FIG. 2 and the Multi RAT Convergence Sub-layer unit 311 of FIG. It is assumed that the Multi RAT convergence sub-layer unit 411 uses a WCDMA communication path as a default communication path, and the WCDMA communication path is used as the default communication path, It goes without saying that the WiFi communication path may be used instead of the communication path. Here, the WCDMA communication path represents a communication path in which WCDMA technology is used, and the WiFi communication path represents a communication path in which WiFi technology is used.

It should be noted that in FIG. 4, the status of the Multi RAT convergence sub-layer unit 411 is shown as "(data plane state of WCDMA communication path, data plane state of WiFi communication path)" do.

Referring to FIG. 4, since the WCDMA communication path is first set, the initial state of the Multi RAT convergence sub-layer unit 411 is set to (OFF, OFF).

When it is detected that a data packet to be transmitted is generated, the Multi RAT Convergence Sub-layer unit 411 determines on which communication path the detected data packet is to be transmitted. When determining to transmit the detected data packet using the WCDMA communication path, the status of the Multi RAT Convergence Sub-layer unit 411 is changed to (ON, OFF), and the detected data packet is transmitted to the WiFi communication Path, the state of the Multi RAT Convergence Sub-layer Unit 411 is changed to (OFF, ON).

Thereafter, when there is no more data packet to be transmitted, the state of the Multi RAT Convergence Sub-layer unit 411 is changed back to (OFF, OFF).

Meanwhile, when the optimum communication path is changed due to a change of the radio channel environment during the transmission of the data packet using either the WCDMA communication path or the WiFi communication path, the corresponding RAT convergence sub- (OFF, ON) when the state is present (ON, OFF), and when the state is ON (OFF, ON) (ON, OFF).

When the data packet amount to be transmitted increases while the Multi RAT convergence sub-layer unit 411 is operating in the ON and OFF states and a higher transmission rate than the currently set transmission rate is required, The convergence sub-layer unit 411 uses both the WCDMA communication path and the WiFi communication path, and thus the state of the Multi RAT convergence sub-layer unit 411 transitions to (ON, ON).

In addition, when the Multi RAT Convergence Sub-layer unit 411 is operating in the (OFF, ON) state, a data packet (or flow) requesting a higher security level than the currently set security level If a transmission is required or a data packet amount to be transmitted increases and a higher transmission rate than the currently set transmission rate is required, the Multi RAT Convergence Sub-layer unit 411 transitions its state to the ON and ON states .

When the communication path of the optimal connection is changed due to the change of the radio channel environment while the Multi RAT Convergence Sub-layer Unit 411 is operating in the ON and ON states, the Multi RAT Convergence Sub- (ON, OFF), the state is changed to the state (ON, OFF) when the corresponding state of the switch is ON (OFF, ON).

Meanwhile, the Multi RAT convergence sub-layer unit 411 controls connection between the WCDMA layer unit 413 and the WiFi layer unit 415 according to the determined status. That is, the Multi RAT Convergence Sub-layer unit 411 maintains a connection with the WCDMA layer unit 413, disconnects from the WiFi layer unit 415 when its status is determined to be ON or OFF, The WCDMA layer unit 413 is disconnected from the WCDMA layer unit 413 and the WCDMA layer unit 413 maintains a connection with the WiFi layer unit 415. When the WCDMA layer unit 413 is determined to be ON or ON, And the WiFi layer unit 415, and releases the connection with each of the WCDMA layer unit 413 and the WiFi layer unit 415 when the status is determined as (OFF, OFF).

As described above, the Multi RAT convergence sub-layer unit 411 uses the remaining communication paths together when an additional communication path is required while selecting and using one optimal communication path. Of course, when the number of communication paths other than the optimum communication path is two or more, the optimum communication path can be selected from the remaining two or more communication paths and used together with the optimal communication path already used. In this way, It is of course that the RAT convergence sub-layer unit 411 can increase the number of communication paths used.

Next, the operation of the hybrid terminal in the multi-RAT supporting wireless communication system according to the embodiment of the present invention will be described with reference to FIG.

Referring to FIG. 5, in step 511, the hybrid terminal detects that it is necessary to select a communication path, and then proceeds to step 513. Here, the hybrid terminal detects that it is necessary to select a communication path when it meets a preset communication path selection path criterion or when it is requested to select a communication path from the hybrid base station. In step 513, the hybrid terminal selects a communication path to be used and proceeds to step 515. In step 515, In step 515, the hybrid terminal transmits information on the selected communication path to the hybrid base station and terminates.

Referring to FIG. 6, a description will now be made of an operation procedure of a complex base station in a multi-RAT supporting wireless communication system according to an embodiment of the present invention.

FIG. 6 is a diagram schematically illustrating an operation procedure of a complex base station in a wireless communication system supporting Multi RAT according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 6, if it is determined in step 611 that the composite BS needs to select a communication path, the process proceeds to step 613. Here, the base station detects that it is necessary to select a communication path when it meets a preset communication path selection path criterion or when it is requested to select a communication path from the hybrid terminal. In step 613, the access point selects a communication path to be used and proceeds to step 615. In step 615, the hybrid access point transmits information on the selected communication path to the hybrid terminal and terminates the process.

Meanwhile, the Multi RAT convergence sub-layer unit 411 may use the following Equation (1) when determining an optimal connection for data packet transmission.

Equation 1

In Equation (1), i ^* represents a communication path actually selected by the Multi RAT convergence sub-layer unit 411, i represents a communication path available in the Multi RAT convergence sub-layer unit 411,

Represents the performance cost determined corresponding to the energy consumed in the communication path i,

Represents the performance cost determined corresponding to the delay generated in the communication path i. Here, i represents any one of a WCDMA communication path, a WiFi communication path, a WCDMA communication path, and a WiFi communication path. In Equation (1), WiFi represents a WiFi communication path, Cellular represents a WCDMA communication path, WCDMA communication path and WiFi communication path. That is, the Multi RAT convergence sub-layer unit 411 transmits the corresponding communication

Wow

The multi-RAT convergence sub-layer unit 411 determines a communication path to be used.

In Equation (1), on the other hand, the performance cost

It is assumed that the Multi RAT convergence sub-layer unit 411 determines the optimal connection. However, the data transmission performance cost considering the various parameters affecting the data transmission performance, such as the transmission delay, It is of course also possible to determine the optimal connection by using. Here, the data transmission performance cost decreases as the data transmission performance through the communication path increases, and conversely, as the data transmission performance decreases.

On the other hand, the performance cost

When a data packet is not transmitted / received through the communication path, that is, when the communication path is idle, and when a data packet is transmitted / received through the communication path, that is, active state.

Therefore,

Can be expressed by the following equation (2).

Equation 2

On the other hand, in Equation (1)

Indicates the probability that a data packet to be transmitted / received is not buffered in a queue,

Represents the power required when the communication path i is idle,

Indicates the probability that a data packet to be transmitted / received is buffered in the queue,

F (e) represents the energy price, and e represents the battery status of the hybrid terminal. Here, the energy price f (e) is determined in accordance with the battery state e of the hybrid terminal. The greater the remaining battery charge, the lower the price, and the lower the battery charge, the higher the price.

In the present invention, it is assumed that the delay is inversely proportional to the probability that a data packet to be transmitted / received is buffered in a queue,

Can be expressed by the following equation (3).

[Amended by Rule 91, 21.05.2013]
Equation 3

In Equation (3)

Represents the expected transmission delay time when the communication path i is used, and a represents a constant used to balance the energy consumption cost and the weight.

Meanwhile, the Multi RAT convergence sub-layer unit 411 may use one of the following equations (4) and (5) when determining the optimal connection for data packet transmission.

[Amended by Rule 91, 21.05.2013]
Equation 4

In Equation (4), j represents the type of performance cost,

Represents the performance cost that occurs for the performance cost j when the communication path i is used, r _j represents a function representing the sum of the performance costs when the total performance cost is detected, and w _j represents the weight for each performance cost . Here, j represents a performance cost determined corresponding to the energy consumed in the communication path i, a performance cost determined in accordance with the transmission delay generated in the communication path i, and a jitter generated in the communication path i And the performance cost determined corresponding to the data loss occurring in the communication path i.

Further, the shape of the r _j in Equation (4) has various implementations possible, one example r _j (x) = x, or r _j (x) = ^x2, and the like can be, in the form of w _j also vary Can be implemented, and can be, for example, any real number including zero.

[Amended by Rule 91, 21.05.2013]
Equation 5

[Amended by Rule 91, 21.05.2013]
In Equation (5), k represents the kind of performance,

Denotes the measured value of the performance k when the communication path i is used, and [mu] _k denotes the gain according to the performance k. Here, the k may be the transmission yield an example, μ _k can be implemented in functional form. In Equation (5), Equation (5) has a form of summing the gain due to the performance improvement and the performance cost due to the performance degradation, and selecting the communication path i whose sum is maximized.

On the other hand,

May be expressed by the following equation (6).

[Amended by Rule 91, 21.05.2013]
Equation 6

In Equation (6), a _i and b _i are weights, which can be implemented as an arbitrary real number, for example.

Also,

May be expressed by the following equation (7).

Equation 7

In Equation (7), D _i denotes a transmission delay time predicted when the communication path i is used, and D _i can be measured or predicted in various forms. For example, the D _i may be represented as shown in equation (8).

Equation 8

In Equation (8), h is a function indicating the relationship between the state of the queue and the transmission delay time, and may be implemented as h (x) = x ^-1 , for example.

On the other hand, the buffer state when the communication path i is used can be expressed by the following equation (9).

Equation 9

In Equation 9, λ represents the rate at which the generated data packet to be transmitted, μ _i represents the transmission rate of the communication path, i.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims

A method for selecting a communication path in a communication path selection device of a wireless communication system supporting a multi-radio access technology (Multi RAT)

Determining at least one performance cost determined corresponding to the performance cost parameter for each of the communication paths;

Selecting at least one communication path using at least one performance cost determined for each of the communication paths.
The method according to claim 1,

Wherein the step of selecting at least one communication path comprises:

Determining at least one measurement value corresponding to the performance parameter for each of the communication paths;

Selecting at least one communication path using at least one performance cost and a measurement value determined for each of the communication paths.
The method according to claim 1,

Wherein the performance cost parameter is one of a required energy, a transmission delay, a jitter, and a loss of data.
3. The method of claim 2,

The performance cost parameter is one of energy required, transmission delay, jitter and data loss,

Wherein the performance parameter is a transmission throughput.
5. The method according to any one of claims 3 and 4,

If the performance cost parameter is a required energy, the performance cost is a probability that a data packet to be transmitted / received is not buffered in a queue, a probability that a data packet to be transmitted / received is buffered in a queue, , The communication path is determined using the required power when the communication path is in an idle state, the required power when the communication path is active, and the energy price. How to choose.
5. The method according to any one of claims 3 and 4,

If the performance cost parameter is a required energy, the performance cost is a probability that a data packet to be transmitted / received is not buffered in a queue, a probability that a data packet to be transmitted / received is buffered in a queue, , The required power when the communication path is idle, the required power when the communication path is active, the energy price, the data packet to be transmitted / received is not buffered in the queue And a second weight that is applied to a probability that the data packet to be transmitted / received is buffered in the queue.
[Amended by Rule 91, 21.05.2013]
5. The method according to any one of claims 3 and 4,
Wherein when the performance cost parameter is energy required, the performance cost is expressed by Equation (10).
< EMI ID = 10.0 >

In Equation (10), i represents a communication path usable in the communication path selection device,
Represents the performance cost determined corresponding to the energy consumed in the communication path i,
Indicates the probability that a data packet to be transmitted / received is not buffered in a queue,
Indicates the probability that a data packet to be transmitted / received is buffered in the queue,
Represents the required power when the communication path i is in an idle state,
F (e) represents the energy price, and e represents the battery state of the communication path selection device.
[Amended by Rule 91, 21.05.2013]
5. The method according to any one of claims 3 and 4,
Wherein when the performance cost parameter is energy required, the performance cost is expressed by Equation (11). &Lt; EMI ID = 11.0 >
< Equation (11) >

In Equation (11), i represents a communication path available in the communication path selection device,
Represents the performance cost determined corresponding to the energy consumed in the communication path i,
Indicates the probability that a data packet to be transmitted / received is not buffered in a queue
Indicates the probability that a data packet to be transmitted / received is buffered in the queue,
Represents the required power when the communication path i is in an idle state,
(E) represents an energy price, e represents a battery state of the communication path selection device, ai represents a power consumption of the data packet to be transmitted / received Denotes a weight applied to the probability that the packet is not buffered in the queue, and bi denotes a weight applied to a probability that the data packet to be transmitted / received is buffered in the queue
5. The method according to any one of claims 3 and 4,

Wherein if the performance cost parameter is a transmission delay, the performance cost is determined using a constant used to balance a transmission delay time, an energy consumption cost, and a specific weight that are predicted when the communication path is used. A method for selecting a communication path of a selected device.
10. The method of claim 9,

Wherein the transmission delay time is determined using a state of a queue.
11. The method of claim 10,

Wherein the state of the queue is determined using a rate at which a data packet to be transmitted is generated and a transmission rate of the communication path i.
5. The method according to any one of claims 3 and 4,

And if the performance cost parameter is a transmission delay, the performance cost is expressed by Equation (12).

&Quot; (12) "

In Equation (12), i represents a communication path usable in the communication path selection device,
Denotes the performance cost determined corresponding to the transmission delay generated in the communication path i, D i denotes the transmission delay time predicted when the communication path i is used, and? Is used to balance the energy consumption cost and the weight Represents a constant.
13. The method of claim 12,

Wherein D i is expressed as Equation (13).

&Quot; (13) "

In Equation (13), h is a function indicating the relationship between the state of the queue and the transmission delay time,
Indicates the probability that a data packet to be transmitted / received is not buffered in the queue.
14. The method of claim 13,

remind
Is expressed by Equation (14). &Lt; EMI ID = 14.0 >

&Quot; (14) "

In Equation 14, λ denotes the speed at which the generated data packet to be transmitted, μ i represents the transmission rate of the communication path, i.
14. The method of claim 13,

The D i
Wherein the communication path selection device selects the communication path based on the communication path selection method.
15. The method of claim 14,

The D i
Wherein the communication path selection device selects the communication path based on the communication path selection method.
5. The method according to any one of claims 3 and 4,

Wherein the step of selecting at least one communication path when the performance cost parameter is a required energy and a transmission delay is expressed as Equation (15).

&Quot; (15) "

In Equation (15), i * denotes a communication path actually selected by the communication path selection device, i denotes a communication path available in the communication path selection device,
Represents the performance cost determined corresponding to the energy consumed in the communication path i,
I represents a first communication path in which a mobile communication technology is used, a second communication path in which WiFi technology is used, and a second communication path in which the first communication path and the second communication path are used, 2, where Cellular represents the first communication path, WiFi represents the second communication path, and Both represents the first communication path and the second communication path.
18. The method of claim 17,

remind
A probability that a data packet to be transmitted / received is not buffered in a queue, a probability that a data packet to be transmitted / received is buffered in a queue, and a probability that a data packet to be transmitted / Wherein the power consumption is determined using the required power, the power required when the communication path is active, and the energy price.
18. The method of claim 17,

remind
A probability that a data packet to be transmitted / received is not buffered in a queue, a probability that a data packet to be transmitted / received is buffered in a queue, and a probability that a data packet to be transmitted / An energy price, a first weight applied to a probability that the data packet to be transmitted / received is not buffered in the queue, and a second weight that is used when the communication path is in an active state, Wherein the second weight is applied to the probability that the data packet to be received is buffered in the queue.
18. The method of claim 17,

remind
Is expressed as Equation (16): " (16) "

&Quot; (16) "

In Equation (16)
Indicates the probability that a data packet to be transmitted / received is not buffered in a queue,
Indicates the probability that a data packet to be transmitted / received is buffered in the queue,
Represents the required power when the communication path i is in an idle state,
F (e) represents the energy price, and e represents the battery state of the communication path selection device.
[Amended by Rule 91, 21.05.2013]
18. The method of claim 17,
remind
Is expressed as Equation (17). &Lt; EMI ID = 17.0 >
< EMI ID = 17.0 >

In Equation 17,
Indicates the probability that a data packet to be transmitted / received is not buffered in a queue,
Indicates the probability that a data packet to be transmitted / received is buffered in the queue,
Represents the required power when the communication path i is in an idle state,
(E) represents an energy price, e represents a battery state of the communication path selection device, and a i represents a power consumption when the communication path i is active, Denotes a weight applied to a probability that a packet is not buffered in a queue, and b i denotes a weight applied to a probability that the data packet to be transmitted / received is buffered in a queue.
18. The method of claim 17,

remind
Is determined by using a constant used for balancing a transmission delay time, an energy consumption cost and a specific weight, which are predicted when the communication path is used.
23. The method of claim 22,

Wherein the transmission delay time is determined using a state of a queue.
24. The method of claim 23,

Wherein the state of the queue is determined using a rate at which a data packet to be transmitted is generated and a transmission rate of the communication path i.
18. The method of claim 17,

remind
Is expressed by Equation (18). &Lt; EMI ID = 18.0 >

&Quot; (18) "

In Equation (18), D i denotes a transmission delay time predicted when the communication path i is used, and α denotes a constant used for balancing the energy consumption cost and the weight.
26. The method of claim 25,

Wherein D i is expressed as: < EMI ID = 19.0 >

&Quot; (19) "

In Equation 19, h is a function indicating the relationship between the state of the queue and the transmission delay time,
Indicates the probability that a data packet to be transmitted / received is not buffered in the queue.
27. The method of claim 26,

remind
Is expressed as Equation (20). &Lt; EMI ID = 20.0 >

&Quot; (20) "

In Equation 20, λ denotes the speed at which the generated data packet to be transmitted, μ i represents the transmission rate of the communication path, i.
27. The method of claim 26,

The D i
Wherein the communication path selection device selects the communication path based on the communication path selection method.
28. The method of claim 27,

The D i
Wherein the communication path selection device selects the communication path based on the communication path selection method.
The method of claim 3,

Wherein the step of selecting at least one communication path using at least one performance cost and the measured value determined for each of the communication paths is expressed by Equation (21): < EMI ID = Way.

&Quot; (21) "

In Equation (21), j represents the kind of performance cost,
Represents the performance cost for the performance cost j when the communication path i is used, r j represents a function representing the sum of the performance costs when the total performance cost is detected, and w j represents the weight for each performance cost .
[Amended by Rule 91, 21.05.2013]
5. The method of claim 4,
Wherein the step of selecting at least one communication path using at least one performance cost and the measurement value determined for each of the communication paths is expressed by Equation (22): &lt; EMI ID = Way.
< Equation (22) >

In Equation (22), k represents the kind of performance,
Denotes the measured value of the performance k when the communication path i is used, and μ k denotes the gain according to the performance k.
1. A communication path selecting apparatus for a wireless communication system supporting a multi-radio access technology (Multi RAT)

Determining at least one performance cost determined corresponding to the performance cost parameter for each of the communication paths, selecting at least one communication path using at least one performance cost determined for each of the communication paths, And a multi-radio access technology (RAT) convergence sub-layer unit.
33. The method of claim 32,

Wherein the Multi RAT Convergence sub-layer unit determines at least one measurement value corresponding to a corresponding performance parameter for each of the communication paths, determines at least one performance cost determined for each of the communication paths, And selects at least one communication path by using the communication route.
33. The method of claim 32,

Wherein the performance cost parameter is one of a required energy, a transmission delay, a jitter, and a data loss.
34. The method of claim 33,

The performance cost parameter is one of energy required, transmission delay, jitter and data loss,

Wherein the performance parameter is a throughput.
36. The method according to any one of claims 34 to 35,

If the performance cost parameter is a required energy, the performance cost is a probability that a data packet to be transmitted / received is not buffered in a queue, a probability that a data packet to be transmitted / received is buffered in a queue, , The required power when the communication path is idle, the required power when the communication path is active, and the energy price.
36. The method according to any one of claims 34 to 35,

If the performance cost parameter is a required energy, the performance cost is a probability that a data packet to be transmitted / received is not buffered in a queue, a probability that a data packet to be transmitted / received is buffered in a queue, , The required power when the communication path is idle, the required power when the communication path is active, the energy price, the data packet to be transmitted / received is not buffered in the queue And a second weight applied to a probability that the data packet to be transmitted / received is buffered in the queue.
[Amended by Rule 91, 21.05.2013]
36. The method according to any one of claims 34 to 35,
Wherein when the performance cost parameter is energy required, the performance cost is expressed by Equation (23).
< EMI ID = 23.0 >

In Equation 23, i represents a communication path available in the communication path selection device,
The performance determined in accordance with the energy consumed in the communication path i indicates the probability that the data packet to be transmitted / received is not buffered in the queue,
Indicates the probability that a data packet to be transmitted / received is buffered in the queue,
Represents the required power when the communication path i is in an idle state,
F (e) represents the energy price, and e represents the battery state of the communication path selection device.
[Amended by Rule 91, 21.05.2013]
36. The method according to any one of claims 34 to 35,
Wherein when the performance cost parameter is energy required, the performance cost is expressed by Equation (24).
< EMI ID = 24.0 >

In Equation 24, i represents a communication path usable in the communication path selection device,
Lt; RTI ID = 0.0 > i < / RTI >
Indicates the probability that a data packet to be transmitted / received is not buffered in a queue,
Indicates the probability that a data packet to be transmitted / received is buffered in the queue,
Represents the required power when the communication path i is in an idle state,
(E) represents an energy price, e represents a battery state of the communication path selection device, and a i represents a power consumption when the communication path i is active, Denotes a weight applied to a probability that a packet is not buffered in a queue, and b i denotes a weight applied to a probability that the data packet to be transmitted / received is buffered in a queue.
36. The method according to any one of claims 34 to 35,

Wherein if the performance cost parameter is a transmission delay, the performance cost is determined using a constant used to balance a transmission delay time, an energy consumption cost, and a specific weight that are predicted when the communication path is used. Selection device.
41. The method of claim 40,

Wherein the transmission delay time is determined using a state of a queue.
42. The method of claim 41,

Wherein the state of the queue is determined using a rate at which a data packet to be transmitted is generated and a transmission rate of the communication path i.
36. The method according to any one of claims 34 to 35,

Wherein when the performance cost parameter is a transmission delay, the performance cost is expressed by Equation (25).

&Quot; (25) "

In Equation 25, i represents a communication path usable in the communication path selection device,
Denotes the performance cost determined corresponding to the transmission delay generated in the communication path i, D i denotes the transmission delay time predicted when the communication path i is used, and? Is used to balance the energy consumption cost and the weight Represents a constant.
44. The method of claim 43,

Wherein D i is expressed as Equation (26).

&Quot; (26) "

In Equation 26, h is a function indicating the relationship between the state of the queue and the transmission delay time,
Indicates the probability that a data packet to be transmitted / received is not buffered in the queue.
45. The method of claim 44,

remind
Is expressed by Equation (27). &Lt; EMI ID = 27.0 >

&Quot; (27) "

In Equation 27, λ denotes the speed at which the generated data packet to be transmitted, μ i represents the transmission rate of the communication path, i.
45. The method of claim 44,

The D i
The communication path selection device comprising:
46. The method of claim 45,

The D i
The communication route selection apparatus comprising:
36. The method according to any one of claims 34 to 35,

Wherein if the performance cost parameter is a required energy and a transmission delay, the Multi RAT convergence sub-layer unit selects at least one communication path using Equation (28).

&Quot; (28) "

In the equation (28), i * represents a communication path actually selected by the communication path selection device, i represents a communication path available in the communication path selection device,
Represents the performance cost determined corresponding to the energy consumed in the communication path i,
I represents a first communication path in which a mobile communication technology is used, a second communication path in which WiFi technology is used, and a second communication path in which the first communication path and the second communication path are used, 2, where Cellular represents the first communication path, WiFi represents the second communication path, and Both represents the first communication path and the second communication path.
49. The method of claim 48,

remind
A probability that a data packet to be transmitted / received is not buffered in a queue, a probability that a data packet to be transmitted / received is buffered in a queue, and a probability that a data packet to be transmitted / Wherein the communication route selection device is determined using the required power, the required power when the communication path is active, and the energy price.
49. The method of claim 48,

remind
A probability that a data packet to be transmitted / received is not buffered in a queue, a probability that a data packet to be transmitted / received is buffered in a queue, and a probability that a data packet to be transmitted / An energy price, a first weight applied to a probability that the data packet to be transmitted / received is not buffered in the queue, and a second weight that is used when the communication path is in an active state, The second weight being applied to the probability that the data packet to be received is buffered in the queue.
[Amended by Rule 91, 21.05.2013]
49. The method of claim 48,
remind
Is expressed by Equation (29). &Lt; EMI ID = 29.0 >
< EMI ID = 29.0 >

In Equation (29)
Indicates the probability that a data packet to be transmitted / received is not buffered in a queue,
The data packet to be transmitted / received is queued
Represents the required power when the communication path i is in an idle state,
F (e) represents the energy price, and e represents the battery state of the communication path selection device.
[Amended by Rule 91, 21.05.2013]
49. The method of claim 48,
remind
Is expressed by the following equation (30). &Lt; EMI ID = 30.0 >
< EMI ID = 30.0 >

In Equation (30)
Indicates the probability that a data packet to be transmitted / received is not buffered in a queue,
Indicates the probability that a data packet to be transmitted / received is buffered in the queue,
Represents the required power when the communication path i is in an idle state,
(E) represents an energy price, e represents a battery state of the communication path selection device, and a i represents a power consumption when the communication path i is active, Denotes a weight applied to a probability that a packet is not buffered in a queue, and b i denotes a weight applied to a probability that the data packet to be transmitted / received is buffered in a queue.
49. The method of claim 48,

remind
Is determined using a constant used to balance the transmission delay time, the energy consumption cost and the weight, which are predicted when the communication path is used.
54. The method of claim 53,

Wherein the transmission delay time is determined using a state of a queue.
55. The method of claim 54,

Wherein the state of the queue is determined using a rate at which a data packet to be transmitted is generated and a transmission rate of the communication path i.
49. The method of claim 48,

remind
Is expressed by the following equation (31).

&Quot; (31) "

In Equation 31, D i represents a transmission delay time predicted when the communication path i is used, and α represents a constant used for balancing the energy consumption cost and the weight.
57. The method of claim 56,

And D i is expressed by Equation (32).

&Quot; (32) "

In Equation (32), h is a function indicating the relationship between the state of the queue and the transmission delay time,
Indicates the probability that a data packet to be transmitted / received is not buffered in the queue.
58. The method of claim 57,

remind
Is expressed as: < EMI ID = 33.0 >

&Quot; (33) "

In Equation 33, λ denotes the speed at which the generated data packet to be transmitted, μ i represents the transmission rate of the communication path, i.
58. The method of claim 57,

The D i
The communication route selection apparatus comprising:
59. The method of claim 58,

The D i
The communication route selection apparatus comprising:
35. The method of claim 34,

Wherein the Multi RAT convergence sub-layer unit selects at least one communication path using Equation (34).

&Quot; (34) "

In Equation 34, j represents the type of performance cost,
Represents the performance cost for the performance cost j when the communication path i is used, r j represents a function representing the sum of the performance costs when the total performance cost is detected, and w j represents the weight for each performance cost .
[Amended by Rule 91, 21.05.2013]
36. The method of claim 35,
Wherein the Multi RAT convergence sub-layer unit selects at least one communication path using Equation (35).
" (35) "

In Equation (35), k indicates the kind of performance, k indicates the kind of performance,
Denotes the measured value of the performance k when the communication path i is used, and μ k denotes the gain according to the performance k.