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WO2011154761A1 - Procédé de transfert de données de liaison descendante dans un système de communication sans fil - Google Patents

Procédé de transfert de données de liaison descendante dans un système de communication sans fil Download PDF

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Publication number
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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WIPO (PCT)
Prior art keywords
downlink data
communication device
reception time
communication
time tolerance
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PCT/IB2010/001714
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English (en)
Inventor
Laurence Meriau
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/IB2010/001714 priority Critical patent/WO2011154761A1/fr
Publication of WO2011154761A1 publication Critical patent/WO2011154761A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

Definitions

  • 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.
  • Downlink (DL) data transfer can take place for non active (i.e. in idle mode) Human-to-Human (H2H) User Equipments (UEs).
  • H2H Human-to-Human
  • UEs User Equipments
  • 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.
  • 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.
  • GGSN/PGW/SGW Gateway GPRS Support Node/Packet Data Network Gateway/Serving Gateway
  • 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.
  • MME/SGSN Mobility Management Entity/Serving GPRS Support Node
  • 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.
  • the paging procedure is quite efficient and well adapted to services intended for humans, such as real-time services.
  • 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.
  • radio bearer user plane
  • Such paging procedures are well adapted to H2H UEs since humans/users expect to receive DL information (data) rapidly when the information is available.
  • paging procedures consumes radio resources and result in signalling in the communication system.
  • 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.
  • 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:
  • 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:
  • 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:
  • 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.
  • 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.
  • a wireless communication system 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.
  • FIG. 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);
  • FIG. 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 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;
  • FIG. 6 shows access of a communication device belonging to a group of devices expecting the same DL data
  • FIG. 7 shows DL data delivery to a communication device belonging to the group when it attaches to the network.
  • 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.
  • M2M Machine-to-Machine
  • 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.
  • M2M devices 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.
  • MTC Machine Type Communication
  • 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.
  • 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.
  • 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.
  • 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.
  • paging may e.g. be avoided for DL data transfer to communication devices having a high reception time tolerance, e.g. M2M devices.
  • 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.
  • 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.
  • 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).
  • FIG. 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.
  • the entity buffering the data 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a communication network entity such as a MME and/or a GGSN/SGW/PGW
  • 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.
  • 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.
  • UP User Plane
  • CP Control Plane
  • 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).
  • 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.
  • the MTC server/user 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.
  • 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:
  • 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
  • the MTC server/user sends DL data to the GW
  • GGSN/SGW/PGW to inform presence of DL data.
  • 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.
  • DDP DL Data is Pending
  • a communication device 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:
  • 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)
  • RAU/TAU Request Routing Area Update/Tracking Area Update
  • DDP 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.
  • 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.
  • 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.
  • 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.
  • RAN Radio Access Network
  • GW Radio Access Network
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • some communication devices may have a partially reception time tolerance and for these types of device some paging may be maintained.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte sur un procédé de transfert de données de liaison descendante dans un système de communication sans fil, ledit transfert de données de liaison descendante étant commandé, par une entité de réseau de communication, à destination d'un ou plusieurs dispositifs de communication dans ledit système de communication sans fil, le procédé comprenant les étapes consistant à : déterminer une tolérance temporelle de réception de données de liaison descendante (DL) pour un dispositif de communication, ladite tolérance temporelle de réception de données de liaison descendante déterminant si un transfert desdites données de liaison descendantes disponibles audit dispositif de communication peut être retardé ou non ; et fournir des données de liaison descendante disponibles audit dispositif de communication sur la base de ladite tolérance temporelle de réception de données de liaison descendante. En outre, l'invention porte également sur un procédé dans un dispositif de communication, sur un procédé dans une entité de réseau de communication, sur un programme d'ordinateur, sur un produit programme d'ordinateur, sur un dispositif de communication et sur une entité de réseau de communication correspondants.
PCT/IB2010/001714 2010-06-10 2010-06-10 Procédé de transfert de données de liaison descendante dans un système de communication sans fil Ceased WO2011154761A1 (fr)

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WO2016053028A1 (fr) * 2014-10-01 2016-04-07 엘지전자 주식회사 Procédé de traitement de données pour terminal, en mode d'économie d'énergie, dans un système de communication sans fil, et dispositif associé
EP3018946A1 (fr) * 2014-11-07 2016-05-11 Cisco Technology, Inc. Système et procédé pour fournir des améliorations en mode d'économie d'énergie dans un environnement de réseau
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