WO2011154761A1 - Method for transfer of downlinik data in a wireless communication system - Google Patents
Method for transfer of downlinik data in a wireless communication system Download PDFInfo
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- WO2011154761A1 WO2011154761A1 PCT/IB2010/001714 IB2010001714W WO2011154761A1 WO 2011154761 A1 WO2011154761 A1 WO 2011154761A1 IB 2010001714 W IB2010001714 W IB 2010001714W WO 2011154761 A1 WO2011154761 A1 WO 2011154761A1
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- downlink data
- communication device
- reception time
- communication
- time tolerance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1221—Wireless traffic scheduling based on age of data to be sent
Abstract
The present invention relates to a method for transfer of downlink data in a wireless communication system, said transfer of downlink data being controlled by a communication network entity to one or more communication devices in said wireless communication system, the method comprises the steps of: determining a downlink data reception time tolerance for a communication device, said downlink data reception time tolerance determining whether transfer of said available downlink data to said communication device can be delayed; and providing available downlink data to said communication device based on said downlink data reception time tolerance. Furthermore, the invention also relates to a method in a communication device, a method in a communication network entity, a computer program, a computer program product, a communication device and a communication network entity thereof.
Description
METHOD FOR TRANSFER OF DOWNLINK DATA IN A WIRELESS
COMMUNICATION SYSTEM
Technical Field
The present invention relates to a method for transfer of downlink data in a wireless communication system. Furthermore, the invention also relates to a method in a communication device, a method in a communication network entity, a computer program, a computer program product, a communication device and a communication network entity thereof.
Background of the Invention
In current 2G/3G/LTE networks according to 3 GPP specifications Downlink (DL) data transfer can take place for non active (i.e. in idle mode) Human-to-Human (H2H) User Equipments (UEs). A Paging mechanism/procedure has been designed for waking up UEs being in idle mode when available DL data is ready for transfer to the UEs. The paging procedure is e.g. described in the 3GPP specification TS 23.060.
In these types of wireless communication systems, paging is triggered by arrival of DL data to UEs in the system. The data is buffered in the network, e.g. in a Gateway GPRS Support Node/Packet Data Network Gateway/Serving Gateway (GGSN/PGW/SGW) node, i.e. a user plane entity, which is a network entity used to transfer data to UEs. This network entity informs a control plane entity, such as a Mobility Management Entity/Serving GPRS Support Node (MME/SGSN), that data are arriving to a UE via radio signalling messages. The MME/SGSN then initiates a paging request in a geographic area where the UE can be located (the UE is in idle mode, i.e. not connected to the network, so it can move silently, therefore the MME/SGSN performs paging in a predefined geographic area where the UE is expected to move silently, i.e. without informing the network of its movement). Paging takes place on the radio interface in all cells of the area provided by the MME/SGSN, and when the UE notice a paging request, it replies to the request and reattaches to the communication network; and the MME/SGSN can request the GGSN/PGW/SGW node to transfer DL data to the UE. If the UE does not reply after a specified time interval, the DL data is removed and therefore lost, and the paging procedure is stopped.
The above described paging procedure is quite efficient and well adapted to services intended for humans, such as real-time services. In this case the paging is initiated by the network, and an UE responds to the paging request and the network determines the location of the UE and establishes the radio bearer (user plane) to allow DL data transfer to take place from a data server to the UE through the communication network. Such paging procedures are well adapted to H2H UEs since humans/users expect to receive DL information (data) rapidly when the information is available. However, paging procedures consumes radio resources and result in signalling in the communication system.
Summary of the Invention
One object of the present invention is to provide a solution for transfer of downlink data in a wireless communication system which remedies and/or mitigate the disadvantages of prior art solutions employing paging mechanism or the like for downlink transfer of data.
Another object of the invention is to provide a solution which can handle downlink data transfer for a high number of communication devices with effective radio resource utilisation and without excessive signalling.
A yet another object of the invention is to provide an alternative solution to the problem of downlink data transfer to communication devices in a wireless communication system. According to one aspect of the invention, the objects are achieved with a method for transfer of downlink data in a wireless communication system, said transfer of downlink data being controlled by a communication network entity to one or more communication devices in said wireless communication system, the method comprising the steps of:
- determining a downlink data reception time tolerance for a communication device, said downlink data reception time tolerance determining whether transfer of said available downlink data to said communication device can be delayed; and
- providing available downlink data to said communication device based on said downlink data reception time tolerance.
Embodiments of the method in a wireless communication system above are defined in the appended dependent claims. According to another aspect of the invention, the objects are also achieved with a method in a communication device for receiving downlink data from a communication network entity in a wireless communication system, said communication device having means and being arranged to receive downlink data from a communication network entity, the method comprising the step of:
- receiving available downlink data based on a downlink data reception time tolerance for said communication device, wherein said downlink data reception time tolerance determines whether transfer of said available downlink data to said communication device can be delayed. According to yet another aspect of the invention, the objects are also achieved with a method in a communication network entity for controlling transfer of available downlink data to one or more communication devices in a wireless communication system, said communication network entity having means and being arranged for controlling transfer of available downlink data to communication devices in said wireless communication system, the method comprising the step of:
- controlling transfer of available downlink data to a communication device based on a downlink data reception time tolerance for said communication device, wherein said downlink data reception time tolerance determines whether transfer of said available downlink data to said communication device can be delayed.
Embodiments of a method in a communication device and a method in a communication network entity described above are defined in appended dependent method claims.
The invention also relates to a computer program and a computer program product when run in a computer causes the computer to execute the method in a communication device and the method in a communication network entity described above.
The invention further relates to a corresponding communication device and a corresponding communication network entity. Furthermore, the communication device and the communication network entity may also be arranged according to the different embodiment of the methods above which is realised by the skilled person.
Embodiments of the invention advantageously improve radio resource utilisation and reduces signalling in a wireless communication system compared to prior art solutions, since DL data transfer mechanisms like paging is not necessary in a communication system employing the method according to the invention. Further, paging need not be implemented or supported in communication devices according to the invention, and therefore low cost communication devices may be provided.
According to an aspect of the invention, it is also made possible for a wireless communication system to handle a large number of communication devices, and therefore avoiding or reducing the risk for congestion in such communication systems.
Other advantages and applications of the present invention will be apparent from the following disclosure. Brief Description of the Drawings
The appended drawings are intended to clarify and explain different embodiments of the present invention in which:
- Figure 1 shows a method for transfer of DL data according to prior art (left hand side) and an embodiment according to the present invention (right hand side);
- Figure 2 shows when a MME/SGSN notices the presence of a communication device being downlink data reception time tolerance, in this case the MME/SGSN can request that DL data is suspended in the MTC server/user when the communication device moves to idle mode;
- Figure 3 shows that subsequent access of a communication device to the network does not trigger data download if there is no DL Data Presence (DDP) = NO for the communication device, wherein subsequent access means the next time the communication device accesses the network;
- Figure 4 shows how arrival and suspension of DL data is signalled to the network without involving paging which is avoided if the communication device is in idle mode;
- Figure 5 shows how subsequent access of a communication device to the network will trigger transfer of DL data if data is pending (DDP = YES);
- Figure 6 shows access of a communication device belonging to a group of devices expecting the same DL data; and
- Figure 7 shows DL data delivery to a communication device belonging to the group when it attaches to the network.
Detailed Description of Embodiments of the Invention
As mentioned above, paging procedures consumes radio resources and result in signalling in a communication system. Furthermore, paging as such is not well adapted to communication systems comprising Machine-to-Machine (M2M) devices requiring non real-time M2M data transfer and/or for communication systems handling a large amount of devices.
It is expected that the number of M2M devices will increase rapidly and be much higher than the number of H2H UEs in future communication systems. It has been estimated that 10 to 20 M2M devices per human end-user will be deployed compared to 1.5 UEs per human end-user.
When seen from the network side, M2M devices also denoted Machine Type Communication (MTC) devices (3GPP specification TS 22.368), in these types of systems communicate through a communication network such as a 3 GPP PLM with MTC servers exchanging data with MTC devices. A M2M device may be a stand alone device or a device integrated in a mobile station, such as a mobile phone, smart phone, PDA, etc.
M2M devices are perceived and treated in the same way as H2H UEs by current communication networks, so the system will use current DL data transfer mechanisms for transfer of DL data to communication devices. This will bring a high number of DL paging procedures for a high number of communication devices which will consume radio resources and increase signalling in the system since paging request responses and establishment of bearers for data transportation will increase with increasing number of communication devices in the system. This will reduce efficiency and increase the overhead of the system.
In addition, in case groups of communication devices expect to receive the same DL data, such procedures will take place at the same time, bringing the risk to congestion in the system. It has been realised by the inventor that there is often no need for rapid transfer of DL data to some type of communication devices, e.g. M2M devices. Many M2M devices are expected to be non time critical to receive DL data since it is expected that the DL data for these types of devices will mostly be configuration data, e.g. data for updating M2M device parameters which not need to be delivered in an urgent/rapid way to M2M devices compared to DL data intended for H2H devices.
For the above stated reasons, the present invention therefore relates to a method for transfer of downlink data in a wireless communication system. The transfer of downlink data to communication devices is controlled by a communication network entity. The inventive method comprises the steps: determining a downlink data reception time tolerance for a communication device; and providing available downlink data to the communication device based on the downlink data reception time tolerance for that communication device.
The present invention therefore provides a method for DL data transfer based on a concept denoted - downlink data reception time tolerance. With this concept paging may e.g. be avoided for DL data transfer to communication devices having a high reception time tolerance, e.g. M2M devices. Thereby, signalling in the system may be substantially reduced and radio resources may be more effectively used. The downlink data reception time tolerance for a communication device determines whether transfer of available DL data to a communication device can be delayed or not, i.e. how "sensitive" communication device are to late reception of available DL data, or in other words how tolerant they are to delay of DL data. H2H devices are generally not tolerant to delay and therefore wants available DL data as soon as possible, hence the paging mechanism in current systems.
However, as mentioned above, M2M device are most often not sensitive to late reception of DL data and therefore the transfer of DL data to these types of communication devices can be
more or less delayed. For this reason paging has not to be performed for these types of devices.
Therefore, according to an embodiment of the invention, paging is not performed on communication devices having a full (high) reception time tolerance when the communication device is in idle mode and available DL data is ready to be transferred/transmitted to the communication device. Instead, DL data is only sent when the communication device becomes active (active mode), and therefore paging signalling and subsequent paging procedures may be avoided and/or reduced in the network and/or in the communication device (devices in which paging is not implemented/supported).
This is especially relevant for M2M devices which preferable are low cost devices due to the fact that a high number of devices of this kind will to be deployed in present and future communication systems. Figure 1 schematically illustrates transfer of DL data according to prior art on the left hand side, while the right hand side of figure 1 shows DL data transfer according to an embodiment of the invention where DL data is only transferred when devices are in active mode. When DL data is available, the entity buffering the data (MTC server/user in figure 1) indicates to the SGSN/MME that DL data is available (step 1 and 2, respectively); and the MME/SGSN memorises that the DL data is suspended. Thereafter, the SGSN/MME requests transfer of data only if notices subsequent access of the device to the network e.g. if the device initiates a message, such as Service Request, (step 3) and request the DL data to be transferred (step 4 and 5, respectively) to the device.
The downlink data reception time tolerance for a communication device can depend on one or more of the following parameters/characteristics: type of communication device, location for a communication device, subscription for a communication device, and configuration of a communication device.
Some devices are time tolerant while others are not, and therefore it is advantageous to distinguish these different types of communication devices. The information regarding which type can either be configured (subscription), or be informed to the network when the communication device attaches to the network (the device informs its type to the network), or be dependent on other parameters, such as the current location for the communication device,
or a specific configuration of the communication device at a certain time instance, or provided by the MTC server/user depending on the data to be sent.
In an embodiment of the invention, the downlink data reception time tolerance for a communication device can be categorised into three different types, namely: fully reception time tolerant, not reception time tolerant and partially reception time tolerant which is an intermediate type of time tolerance.
For fully time tolerant characteristics, the communication device is not sensitive to late reception of DL data, e.g. M2M devices often only need configuration data which is not urgent for these types of communication devices. Therefore, these types of communication devices can in low cost and/or low complex versions refrain from supporting paging procedures completely which means that paging is not implemented in these types of communication devices.
However, for not time tolerant communication devices it is important that DL data is transmitted to these types of devices in a direct and immediate way by means of a paging procedure (or a corresponding mechanism), this is e.g. the case for H2H devices. Hence, DL data will be transferred to these types of communication device as soon as the DL data is available in the network.
Nevertheless, it is also envisaged that the present invention may also be employed for usually non-time tolerant communication devices for which some DL data transfer can be time tolerant while other DL data is not time tolerant (the latter DL data need to be transferred with paging, i.e. immediately when available in the network). Such communication devices may be categorised as partially reception time tolerant and these types of devices can also benefit from the methods describe in the present application.
For these types of partially time tolerant devices a MTC server may dynamically indicate the delay tolerance for available DL data, and hence this information is not subscription based which is static information. For these types of communication devices, paging may be performed in some situations and not in other situations, thereby being partially time tolerant devices meaning that the transfer delay can be dependent on the situation; e.g. if a MTC
application (MTC server/user) wants DL data to be transferred to M2M devices at some particular moments this may be implemented for communication devices which are partially time tolerant. The downlink data reception time tolerance can be determined by the communication network entity when a communication device attaches to the system, so as to be obtained from subscription information for the communication device. However, the downlink data reception time tolerance can also be provided by a MTC server/user when the MTC server/user transfers available DL data to the communication device.
The downlink data reception time tolerance "value" or "parameter" can, according to an embodiment of the invention, be stored in a communication network entity, such as a MME/SGSN. The MME/SGSN network entity is an entity memorizing device information for each device that attaches to the mobile network. The fact that the device supports delay tolerance for DL data transfer can be contained in the list of information characterising the device. Other types of information can e.g. be: the current location of the device, the identification of the device, the state of the device (idle or active mode), etc.
It has been described that the paging procedure can be based on the downlink data reception time tolerance for communication devices, which means that paging is employed or not depending on the downlink data reception time tolerance. For example, transfer of available DL data for a communication device may be suspended, e.g. on request by a communication network entity (such as a MME and/or a GGSN/SGW/PGW) if the downlink data reception time tolerance is fully reception time tolerant for a communication device so as to avoid paging.
The network can request the MTC server/user to suspend DL data for fully or partially time tolerant communication devices in order to avoid paging. If a communication device is fully or partially time tolerant for DL data transfer, the MME/SGSN may notify a data Gateway (GW), such as GGSN/SGW/PGW in 3 GPP networks, of this fact as soon as the device moves to idle mode. Therefore, paging for arriving DL data will not be performed, and if the DL data is buffered in the MTC server/user, the GW requests the MTC server/user to suspend transfer of future DL data, e.g. either via User Plane (UP) removal or a Control Plane (CP) message.
Figure 2 shows that presence of a time tolerant device is notified to the GW/MTC server/user: 1) MTC server/user notice that the M2M device is active and hence transfer of DL data is possible; and 2) when the M2M device moves to idle mode, the network suspends transfer of DL data (this can be done by UP removal).
However, if buffering takes place in the GW (GGSN/SGW/PGW), the GW does not inform the MTC server/user so DL data will arrive to the GW when available, which means that the GW will buffer data but not trigger paging. Note also that if DL data are already available at the moment when the communication device attaches, the data can be sent at this specific moment.
When paging is avoided in the case that DL data is available for a communication device, such as when the communication device is in idle mode and the buffer is stored in a MTC server/user, the MTC server/user does not send DL data to the communication device, and the paging is not performed for the communication device. The DL data is instead kept buffered and DL data transmission can take place at subsequent access of the device to the network after leaving idle mode, i.e. when returning to active mode.
In order to avoid systematic checks of potential DL data presence, the MTC server/user informs the GW when DL data is available if suspension of DL data was requested when the device moved to idle mode:
• If data are buffered in the MTC server/user, the MTC server/user can avoid to send DL data but the MTC server/user informs the GW of presence of DL data, a CP message is used, i.e. signalling between network entities; and
· If data are buffered in the GW, the MTC server/user sends DL data to the GW
(GGSN/SGW/PGW) to inform presence of DL data.
Then the GW informs the MME/SGSN that DL data is suspended, the MME/SGSN memorizes that DL Data is Pending (DDP) but does not trigger paging. If there is a need to initiate paging and if the communication device support paging (e.g. being partially time tolerant), the MTC server/user notifies that DL data have to be delivered so that paging is performed by the MME/SGSN. Figure 4 illustrates how DL data arrival for time tolerant data
are buffered and do not trigger paging: 1) when DL data is available and pending, the MTC server/user informs the GW and the GW informs the MME/SGSN; and 2) the MME memorizes that DL data are pending (DDP = YES) but does not trigger paging if the device is in idle mode, which saves radio resources and reduces signalling.
When a communication device becomes active in the network, e.g. when a device attaches to the network by an Attach Request (e.g. defined in 3GPP specification TS 23.060, Routing Area Update/Tracking Area Update (RAU/TAU Request) or in other way of accessing the network for sending UL data or perform other actions (like a Service Request), and if the MME/SGSN has memorized that DL data is pending (DDP) for the communication device, then DL data transfer will take place e.g. by:
The MME/SGSN informs the GW to start data transfer, i.e. an UP is established; and
If buffering takes place in the MTC server/user, the GW triggers data transfer from the MTC server/user which starts data transfer, but if buffering takes place in the GW, the GW starts the DL data transfer.
The DL data transfer can take place via the UP or via CP. If the communication device returns to active mode and if DDP is not present (DDP = NO), DL data transfer will not be requested, which avoids signalling.
Figure 5 shows how a MME/SGSN checks whether data are pending at the next (subsequent) time a device accesses the network and allow transfer of DL data if DL data is available: 1) the device accesses the network, e.g. by signalling a Service Request or a RAU/TAU Request; and 2) if DL data are pending, the MTC server/user may transfer the DL data. Figure 3 shows the procedure when no DL data is pending: at a subsequent signalling or Mobile Originating UL data transfer, wherein if the DDP = NO, no UP is established for DL data so the signalling to establish the UP that would not be used for non existing DL is avoided.
The MME/SGSN can inform the GW in different ways, such as via bearer re-establishment with the Radio Access Network (RAN) and with GW, which is preferable if the size of the data to be received is not known, or via a CP message if DL data amount can be transferred with the signalling information in the same CP response, in which case no bearer is established in the network and thereby network resources are saved.
In the case that the DL data storage is performed outside of the network, e.g. in the MTC server/user, the MME/SGSN informs the GW when a communication device moves to idle mode: if a GW knows when a M2M device moves to idle mode and that the M2M device is reception tolerant, then the GW can request the MTC server/user to suspend DL data (CP message or UP removal between GW and MTC sever/user); and when suspended, DL Data are buffered in the MTC server/user for the M2M device until the GW notifies that DL data transfer can be started. This makes it e.g. possible to: avoid a GW buffering data for long period, as it is not possible to determine when the device again will access the network, in particular if M2M devices have few activities and if no paging is performed (while with a paging procedure, the buffer size is calculated to allow buffering of data for the max duration of a paging procedure); avoid buffering of data in the network (GW) for millions of devices in the network, buffering can instead be performed once in the MTC server/user since it is accessed by many GWs; to allow data to be available for other devices belonging to the same group having a common reception tolerance (if data are downloaded to a particular GW, devices accessing from a different GW pool will not find any data in the server); and allow the server to decide when data are obsolete and remove or change the data (if needed) before the data is sent to the network.
In case the DL data storage is performed in the network, e.g. in the GW (in a GGSN/serving GW like for normal H2H procedure), a MME/SGSN informs the GW when a communication device moves to idle mode. Thereafter, the GW buffers any DL data received from MTC server/user for that communication device. However, the buffer for time tolerant devices may need to be larger compared to buffers for other non reception tolerant devices as there is no way to determine when the device will access the network again since paging is not performed to wake up devices in idle mode.
Also, then the GW needs to drop data, DL data may be lost since it is not assured that a data server keeps the DL data, and GW cannot send the data back to the MTC server/user for a future re-sending as the server may not accept such data coming from a network and not from the MTC application. Also, buffering in the GW is possible, but might be more inefficient as buffering in the MTC server/user as buffering can be shared with multiple MTC servers/users.
As aforementioned, some communication devices may have a partially reception time tolerance and for these types of device some paging may be maintained. Even if the communication device is delay tolerant and immediate data sending can be avoided to save signalling in the network, there may be cases when it is important for the MTC server/user to send DL data to the communication device rapidly. In this case the paging mechanism is needed to allow rapid data transfer.
According to another embodiment of the invention the method further comprises the steps of: dividing communication devices into one or more different groups of communication devices having a common downlink data reception time tolerance; and providing available downlink data to one or more communication devices belonging to a group having a common downlink data reception time tolerance based on said common downlink data reception time tolerance. As for the downlink data reception time tolerance for a single communication device the common downlink data reception time tolerance determines whether transfer of available downlink data can be delayed, but in this case this delay is for a group of devices. Since communication devices can be grouped together having a common downlink data reception time tolerance, the signalling can be further reduced in the communication system according to this embodiment. As described above for single communication devices, the common downlink data reception time tolerance can also be: fully reception time tolerant, not reception time tolerant or partially reception time tolerant for different groups of communication devices. It is for example expected that many M2M devices will be of the same type, for example fire sensors located on trees in a forest, and hence these devices can be grouped together to beneficiate from grouped management and/or grouped configuration. According to this embodiment, DL data can be suspended for all communication devices belonging to a group of devices expecting the same DL data. For example the MME/SGSN knows the group to which a M2M device belong either by the device providing its group identifier when attaching to the network and the MME/SGSN entity memorizes the information, or via subscription information obtained at attachment of the communication device to the network or by device characteristics shared amongst multiple devices in a group. Figure 6 illustrates how DL data
for a group of devices can be suspended: 1) MTC server/user notices when a device in the group attaches to the network; 2) the device moves to idle mode; 3) when DL data is available in the MTC server/user, the DL data is buffered and its presence is notified to the MME/SGSN; and 4) paging is not triggered for the device in idle mode.
Also, the MME/SGSN can request DL data transfer for any active communication devices belonging to a group, and if the group is classified as delay tolerant, the MME/SGSN indicates the tolerance of the whole group, and DL data are suspended for the whole group. When a device in a group gets active in the same MME, pending DL data can be sent to the device when the MME/SGSN identifies that the device belongs to the same group for which data have been suspended. MTC server/user can replicate DL data when sending transferring data to a device belonging to the group so that the DL data remains available for other devices belonging to the group. Finally, the MTC server/user indicates when no more DL data is to be sent in order to avoid request of data when further communication devices attach. Figure 7 shows how DL data can be transferred when one device in a group moves to active mode: 1) DL data can be replicated before being sent to the device in order to be sent to other devices in the same group; and 2) the server decides when DL Data sending needs to be stopped.
Furthermore, the present invention also relates to a method in a communication device and a method in a communication network entity.
The method in a communication device involves the step of: receiving available downlink data based on a downlink data reception time tolerance for the communication device, wherein the downlink data reception time tolerance determines whether transfer of the available downlink data to the communication device can be delayed.
The method in a communication network entity involves the step of: controlling transfer of available downlink data to a communication device based on a downlink data reception time tolerance for the communication device, wherein the downlink data reception time tolerance determines whether transfer of the available downlink data to the communication device can be delayed.
Embodiments of the method in a communication device and in a communication network entity described above are defined in the appended dependent claims. However, other embodiments of these methods according to the present application are possible. Furthermore, as understood by the person skilled in the art, a method in a communication device and a method in a communication network entity according to the present invention may be implemented in a computer program, having code means, which when run in a computer causes the computer to execute the steps of the method. The computer program is included in a computer readable medium of a computer program product. The computer readable medium may consist of essentially any memory, such as a ROM (Read-Only Memory), a PROM (Programmable Read-Only Memory), an EPROM (Erasable PROM), a Flash memory, an EEPROM (Electrically Erasable PROM), or a hard disk drive.
Moreover, the invention also relates to a communication device and a communication network entity.
The communication device has means and is arranged to receive downlink data. Further, the communication device is arranged to receive available downlink data based on a downlink data reception time tolerance for the communication device, wherein the downlink data reception time tolerance determines whether transfer of the available downlink data to the communication device can be delayed.
The communication network entity has means and is arranged for controlling transfer of available downlink data to communication devices in a wireless communication system. Further, the communication network entity is arranged to control transfer of available downlink data to a communication device based on a downlink data reception time tolerance for the communication device, wherein the downlink data reception time tolerance determines whether transfer of the available downlink data to the communication device can be delayed. The communication device and the communication network entity may be modified according to any of the embodiments of the methods described above, mutatis mutandis.
Finally, it should be understood that the present invention is not limited to the embodiments described above, but also relates to and incorporates all embodiments within the scope of the appended independent claims.
Claims
1. Method for transfer of downlink data in a wireless communication system, said transfer of downlink data being controlled by a communication network entity to one or more communication devices in said wireless communication system, characterised by
- determining a downlink data reception time tolerance for a communication device, said downlink data reception time tolerance determining whether transfer of said available downlink data to said communication device can be delayed; and
- providing available downlink data to said communication device based on said downlink data reception time tolerance.
2. Method according to claim 1, wherein
- said downlink data reception time tolerance is dependent on one or more of the following characteristics in the group comprising: type of communication device, location for a communication device, subscription for a communication device, and configuration of a communication device.
3. Method according to claim 1 , wherein
- said downlink data reception time tolerance is selected from the group comprising: fully reception time tolerant, not reception time tolerant and partially reception time tolerant.
4. Method according to any of claims 1-3, wherein said step of providing downlink data involve:
- transferring said available downlink data to said communication device depending on said downlink data reception time tolerance.
5. Method according to claim 4, wherein
- said wireless communication system determines whether to employ a paging procedure or not based on said downlink data reception time tolerance for said communication device, said paging procedure indicating said communication device in idle mode of available downlink data to said communication device.
6. Method according to claim 5, comprising: - suspending, on request by said communication network entity, transfer of said available downlink data to said communication device if said downlink data reception time tolerance is fully reception time tolerant for said communication device so as to avoid said paging procedure.
7. Method according to claim 6, wherein
- said wireless communication system further comprises a data provider, such as a machine type communication (MTC) server/user, said data provider being arranged to provide downlink data to machine type communication (MTC) devices via a data gateway
(GGSN/SGWVPGW/M2MGW) in said wireless communication system; and
- said suspended available downlink data is being buffered in said data provider or in said data gateway (GGSN/SGW/PGW/M2MGW) on request by said communication network entity when said communication device is in idle mode and said downlink data reception time tolerance is fully reception time tolerant.
8. Method according to claims 7, comprising:
- transferring said suspended available downlink data to said communication device on request by said communication network entity when said communication device returns to active mode.
9. Method according to claim 1 , wherein
- said downlink data reception time tolerance for said communication device is determined by said communication network entity when said communication device attaches to said wireless communication system.
10. Method according to claim 9, wherein
- said downlink data reception time tolerance for said communication device is obtained from subscription information for said communication device.
11. Method according to claim 1 , wherein
- said downlink data reception time tolerance for said communication device is provided by a machine type communication (MTC) server/user when said machine type communication (MTC) server/user intends to transfer said available downlink data to said communication device.
12. Method according to claim 1, wherein
- said communication network entity is a machine type communication (MTC) server/user and/or a mobility management entity (MME/SGSN) and/or a packet data gateway
(GGSN/SGW/PGW/M2MGW); and/or
- said communication devices is a machine type communication (MTC) device or a user equipment (UE); and/or
- said wireless communication system is a 3 GPP wireless communication system.
13. Method according to claim 12, wherein
- said downlink data reception time tolerance for said communication device is stored in said communication network entity.
14. Method according to 1, comprising:
- dividing communication devices into one or more different groups of communication devices, wherein each group of communication devices has a common downlink data reception time tolerance, said common downlink data reception time tolerance determining whether transfer of available downlink data to communication devices belonging to a group can be delayed; and
- providing available downlink data to one or more communication devices belonging to a group having a common downlink data reception time tolerance based on said common downlink data reception time tolerance.
15. Method according to claim 14, wherein
- said common downlink data reception time tolerance is any in the group comprising: fully reception time tolerant, not reception time tolerant and partially reception time tolerant.
16. Method according to claim 1, wherein said communication device is arranged to be:
- in idle mode in which no connection is established between said communication device and said wireless communication system, or - in active mode in which a connection is established between said communication device and said wireless communication system.
17. Method in a communication device for receiving downlink data from a communication network entity in a wireless communication system, said communication device having means and being arranged to receive downlink data from a communication network entity, characterised by the step of:
- receiving available downlink data based on a downlink data reception time tolerance for said communication device, wherein said downlink data reception time tolerance determines whether transfer of said available downlink data to said communication device can be delayed.
18. Method according to claim 17, wherein
- said downlink data reception time tolerance is dependent on one or more of the following characteristics in the group comprising: type of communication device, location for a communication device, subscription for a communication device, and configuration of a communication device.
19. Method according to claim 17 or 18, wherein
- said communication device is a machine type communication (MTC) device or an user equipment (UE).
20. Method according to claim 17, wherein said communication device is arranged to be:
- in idle mode in which no connection is established between said communication device and said wireless communication system, or
- in active mode in which a connection is established between said communication device and said wireless communication system.
21. Method in a communication network entity for controlling transfer of available downlink data to one or more communication devices in a wireless communication system, said communication network entity having means and being arranged for controlling transfer of available downlink data to communication devices in said wireless communication system, characterised by:
- controlling transfer of available downlink data to a communication device in said
communication system based on a downlink data reception time tolerance for said
communication device, wherein said downlink data reception time tolerance determines whether transfer of said available downlink data to said communication device can be delayed.
22. Method according to claim 21, wherein
- said downlink data reception time tolerance is selected from the group comprising: fully reception time tolerant, not reception time tolerant and partially reception time tolerant.
23. Method according to claim 22, further comprising the step of:
- determining whether to employ a paging procedure or not based on said downlink data reception time tolerance for said communication device, said paging procedure indicating said communication device in idle mode of available downlink data to said communication device.
24. Method according to claim 23, further comprising the step of:
- suspending transfer of said available downlink data to said communication device if said communication device is in idle mode and said downlink data reception time tolerance is fully reception time tolerant so as to avoid said paging procedure.
25. Method according to claim 24, further comprising the step of:
- transferring said suspended available downlink data to said communication device when said communication device triggers reception of said suspended available downlink data when said communication device is in active mode.
26. Method according to claim 21 , wherein
- said downlink data reception time tolerance is dependent on one or more of the following characteristics in the group comprising: type of communication device, location for a communication device, subscription for a communication device, configuration of a communication device.
27. Method according to any of claims 21 , wherein
- said communication network entity is a mobility management entity (MME/SGSN) and said wireless communication system is a 3 GPP wireless communication system.
28. Method according to claim 27, wherein
- said downlink data reception time tolerance for said communication device is stored in said communication network entity.
29. Method according to claim 21, wherein said communication device is arranged to be:
- in idle mode in which no connection is established between said communication device and said wireless communication system, or
- in active mode in which a connection is established between said communication device and said wireless communication system.
30. Method according to claim 21 , further comprising the step of:
- determining said downlink data reception time tolerance for said communication device when said communication device attaches to said wireless communication system.
31. Method according to claim 30, wherein
- said downlink data reception time tolerance for said communication device is obtained from subscription information for said communication device.
32. Method according to claim 30, wherein
- said downlink data reception time tolerance for said communication device is provided by a machine type communication (MTC) server/user when said machine type communication (MTC) server/user intends to transfer said available downlink data to said communication device.
33. Computer program, characterised in code means, which when run in a computer causes said computer to execute said method according to any of claims 17-32.
34. Computer program product comprising a computer readable medium and a computer program according to claim 33, wherein said computer program is included in the computer readable medium, and consist of one or more from the group: ROM (Read-Only Memory), PROM (Programmable ROM), EPROM (Erasable PROM), Flash memory, EEPROM (Electrically EPROM) and hard disk drive.
35. Communication device for receiving downlink data from a communication network entity in a wireless communication system, said communication device having means and being arranged to receive downlink data from a communication network entity,
characterised in that said communication device being arranged to receive available downlink data based on a downlink data reception time tolerance for said communication device, wherein said downlink data reception time tolerance determines whether transfer of said available downlink data to said communication device can be delayed.
36. Communication network entity for controlling transfer of available downlink data to one or more commumcation devices in a wireless commumcation system, said communication network entity having means and being arranged for controlling transfer of available downlink data to communication devices in said wireless communication system, characterised in that said communication network entity being arranged to control transfer of available downlink data to a commumcation device based on a downlink data reception time tolerance for said communication device, wherein said downlink data reception time tolerance determines whether transfer of said available downlink data to said commumcation device can be delayed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IB2010/001714 WO2011154761A1 (en) | 2010-06-10 | 2010-06-10 | Method for transfer of downlinik data in a wireless communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IB2010/001714 WO2011154761A1 (en) | 2010-06-10 | 2010-06-10 | Method for transfer of downlinik data in a wireless communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011154761A1 true WO2011154761A1 (en) | 2011-12-15 |
Family
ID=45097579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2010/001714 WO2011154761A1 (en) | 2010-06-10 | 2010-06-10 | Method for transfer of downlinik data in a wireless communication system |
Country Status (1)
| Country | Link |
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| WO (1) | WO2011154761A1 (en) |
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