WO2013143219A1 - 设置后退定时器的方法和网络侧 - Google Patents

设置后退定时器的方法和网络侧 Download PDF

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Publication number
WO2013143219A1
WO2013143219A1 PCT/CN2012/075869 CN2012075869W WO2013143219A1 WO 2013143219 A1 WO2013143219 A1 WO 2013143219A1 CN 2012075869 W CN2012075869 W CN 2012075869W WO 2013143219 A1 WO2013143219 A1 WO 2013143219A1
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Prior art keywords
priority
network side
timer
network
access stratum
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PCT/CN2012/075869
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English (en)
French (fr)
Inventor
许辉
谢宝国
吴传喜
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中兴通讯股份有限公司
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Publication of WO2013143219A1 publication Critical patent/WO2013143219A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to wireless communication technologies, and in particular, to a method and a network side for setting a backoff timer.
  • Machine to Machine (M2M) technology refers to all the techniques and means of establishing a connection between machines.
  • the M2M concept emerged in the 1990s, but only stayed in the theoretical stage.
  • M2M business appeared on the market and developed rapidly in the following years, becoming the focus of many communication equipment vendors and telecom operators.
  • the number of machines in the world is much larger than that of people, so it is foreseeable that M2M technology has a good market prospect.
  • Mobile communication networks are designed primarily for human-to-human communication, while communication between machines and machines, people and machines is under-optimized. In addition, how operators can provide M2M communication services at low cost is also the key to successful M2M communication deployment.
  • M2M mobile networks support M2M communication.
  • the solution is to maximize the reuse of existing networks, reduce the impact of a large number of M2M communications on the network, and the complexity of operational maintenance.
  • the telecommunications market is becoming more and more fierce, tariffs are declining, operators' profit margins are decreasing, and the people-based communications market is becoming saturated.
  • M2M is a new development opportunity for operators.
  • MTC Machine Type
  • Communication including M2M, Machine to Man communication business, its business scope far exceeds the communication between people to human (H2H, Human to Human), MTC in access control, billing Security, Quality of Service (QoS), business model, etc. are very different from the current H2H communication mode.
  • the 3GPP Evolved Packet System includes a radio access network (such as
  • UMTS Terrestrial Radio Access Network
  • Evolved UTRAN Evolved UTRAN
  • GSM/EDGE Radio Access Network GERAN
  • core network In the evolved packet core network (EPC, Evolved Packet Core), there are networks such as Mobility Management Entity (MME), Serving Gateway (SG), and Packet Data Network (PDN) Gateway (PGW, PDN Gateway).
  • MME Mobility Management Entity
  • SGSN Serving Gateway
  • PGW Packet Data Network Gateway
  • GPRS general packet radio service
  • a network element such as a serving GPRS support node (SGSN) is included; and an evolved Node B (eNB) is included in the E-UTRAN.
  • SGSN serving GPRS support node
  • eNB evolved Node B
  • 3GPP proposes a mechanism for adopting backoff time, including session management backoff timer and mobility management backoff timer.
  • the back-off timer is generally sent by the network side to the UE in a refusal message using Non-Access Stratum (NAS) signaling.
  • NAS Non-Access Stratum
  • the MME When an APN is detected to be congested, the MME shall run a Session Management back-off Timer and reject the EPS Session Management (ESM) request message (including the PDN) from the UE. Connection, bearer resource allocation or resource modification request, etc.).
  • ESM EPS Session Management
  • the Session Management back-off Timer in the MME is based on each UE and APN.
  • the Session Management back-off Timer should be cleared before the MME sends a session management request message to the UE.
  • the MME In the general congestion scenario, the MME generates and runs a back-off Timer and rejects the mobility management signaling request from the terminal.
  • the UE In addition to the high-priority user (Service User), emergency services (Mobile Services), mobile called the Mobile Terminated Services, the UE should not initiate mobility management messages for other services.
  • the UE When the UE receives the paging message, the UE should stop the Mobility Management back-off Timer and can issue a service request procedure.
  • the MTC user equipment UE is generally insensitive to the delay and is considered to belong to the low-priority UE.
  • Some MTC applications can have normal priorities, such as real-time monitoring, fault reporting, etc.
  • the common UE adds the MTC function module as the MTC user. Device; therefore the UE can have dual priority: low priority and normal priority.
  • the back-off timer used by the congestion management does not distinguish between the low priority and the normal priority, and uses the same back-off timer; For a dual-priority UE, when the low-priority and normal-priority delays are different, the same back-off timer does not meet the requirements of the dual-priority UE. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a method for setting a back-off timer and a network side to meet the back-off processing requirements of dual-priority UEs.
  • the present invention provides a method for setting a back-off timer, including: receiving, by a network side, non-access stratum signaling sent by a user equipment, determining that the network is congested, according to the non-access stratum signaling Carrying a priority, sending a reject message to the user equipment, carrying a backoff timer for the priority.
  • the foregoing method may further have the following feature: the carrying back the timer for the priority includes: when the priority carried in the non-access stratum signaling is a low priority, carrying the low priority The back timer.
  • the foregoing method may further have the following feature: the carrying back the timer for the priority includes: carrying a pin when the priority carried in the non-access stratum signaling is a normal priority
  • the normal priority includes a specified access type.
  • the foregoing method may further have the following features, the normal priority includes: a priority other than a high priority, and an emergency call and a low priority.
  • the foregoing method may further have the following feature: the network side determines whether the network is congested according to the following manner: when the non-access stratum signaling includes an access point name (APN), and the network side detects the APN congestion. Or, the non-access stratum signaling does not include the APN, and the network side detects the general congestion, and the network is congested.
  • APN access point name
  • the foregoing method may further have the following feature: the network side is a mobility management entity/service general packet radio service support node (MME/SGSN).
  • MME/SGSN mobility management entity/service general packet radio service support node
  • the foregoing method may also have the following feature: the value of the back-off timer is a default value, or is set by the MME/SGSN, or is obtained by the MME/SGSN from other network elements.
  • the invention also provides a network side, comprising:
  • a congestion judging unit configured to: determine, after receiving the non-access stratum signaling sent by the user equipment, whether the network is congested;
  • a response unit configured to: after the congestion judging unit determines that the network is congested, send a reject message to the user equipment according to a priority carried in the non-access stratum signaling, and carry a backoff for the priority Timer.
  • the network side may further have the following feature: the response unit is configured to: carry a backoff timer for the priority in the reject message, including: a priority carried in the non-access stratum signaling When the level is low priority, the backoff timer for the low priority is carried in the reject message.
  • the network side may also have the following features, where the response unit is configured to: carry the back timer for the priority in the:
  • the refusal message carries a backoff timer for a normal priority, where the normal priority includes a specified access type.
  • the network side may also have the following characteristics, where the normal priority includes: a priority other than a high priority, and an emergency call and a low priority.
  • the network side may also have the following features, and the congestion determining unit is configured as: Determine if the network is congested as follows:
  • the network side detects the APN congestion, or the non-access stratum signaling does not include the APN and the network side detects the general congestion, the network is congested.
  • the network side may also have the following features: the network side is an MME/SGSN.
  • the network side may also have the following features: The network side is configured to: determine the value of the back-off timer according to the following manner: using a default value, or being set by the MME/SGSN, or by The MME/SGSN is obtained from other network elements.
  • the method provided by the embodiment of the present invention sets different backoff timers for different priorities to meet the delay requirements of different priorities.
  • FIG. 1 is a schematic diagram of a system architecture in a non-roaming scenario in 3GPP;
  • FIG. 2 is a schematic diagram of NAS signaling
  • FIG. 3 is a schematic flowchart of setting a backoff timer according to the present invention.
  • FIG. 4 is a schematic diagram of setting a back-off timer according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of setting a backoff timer according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic structural diagram of a system for setting a back timer according to an embodiment of the present invention.
  • FIG. 7 is a block diagram of a network side according to an embodiment of the present invention. Preferred embodiment of the invention
  • the embodiment of the invention provides a method for setting a back timer, which includes:
  • the network side receives the non-access stratum signaling sent by the user equipment, and after determining that the network is congested, sending a reject message to the user equipment according to the priority carried in the non-access stratum signaling, carrying the The back timer.
  • the carrying back the timer for the priority includes:
  • the back-off timer for the low priority is carried.
  • the priority carried in the non-access stratum signaling is a normal priority
  • carrying a backoff timer for a normal priority where the normal priority includes a specified access type.
  • the normal priority refers to: In addition to high priority, such as access type 11-15, and priority other than emergency call and low priority.
  • the normal priority may use an existing call type or define a new call type identifier.
  • the non-access stratum signaling is mobility management signaling or session management signaling;
  • the back-off timer for the priority is a back-off timer corresponding to the signaling type of the non-access stratum signaling of the priority.
  • the network side determines whether the network is congested according to the following manner:
  • the network side detects the APN congestion, or the non-access stratum signaling does not include the APN and the network side detects the general congestion, the network is congested.
  • the network side is an MME/SGSN.
  • the value of the back-off timer is a default value, or is set by the MME/SGSN, or is obtained by the MME/SGSN from other network elements.
  • the method for setting a back-off timer includes: Step 101: A UE sends signaling to a network side.
  • the UE may be dual-priority or more-priority, for example, 3 priorities.
  • the UE has two priorities, but the present invention is not limited thereto.
  • the present invention can also be applied to the case where the IJE has only one priority.
  • the signaling is NAS signaling, that is, independent of the radio access technology, independent of the functions and processes related to the radio access, including mobility management signaling and session management signaling;
  • the network side refers to: MME or SGSN;
  • the signaling includes priority indication information, such as low priority or normal priority.
  • Step 102 the network side determines whether it is congested, and if yes, proceeds to step 103, otherwise the steering step 106.
  • the congestion refers to congestion of the core network, including specific APN congestion and general congestion;
  • the congestion may be actively detected by the MME/SGSN or obtained by an indication message of other network elements.
  • Step 103 The network side determines the priority carried in the received signaling, and if it is a low priority, proceeds to step 104, otherwise proceeds to step 105.
  • Step 104 The network side sends a reject message to the UE, and includes a back timer for the low priority in the message, and the process ends.
  • the low-priority back-off timer is determined by the network side MME/SGSN, and the UE is notified in the reject message;
  • the value of the back-off timer may be default, or set by the MME/SGSN, or received from other network elements;
  • the network side selects a corresponding timer according to the signaling type of the UE, such as mobility management or session management signaling.
  • the network side may be a packet-switched domain (PS, Packet-Switched) or a circuit-switched domain (CS), and the network side selects different timers according to different domains.
  • PS packet-switched domain
  • CS circuit-switched domain
  • Step 105 The network side sends a reject message to the UE, and includes a back timer for the normal priority in the message, and the process ends.
  • the back-off timer for the normal priority is determined by the network side MME/SGSN, and the UE is notified in the reject message;
  • the value of the back-off timer may be default, or set by the MME/SGSN, or received from other network elements.
  • the network side selects a corresponding timer according to the signaling type of the UE, such as mobility management or session management signaling.
  • the network side may be a packet-switched domain (PS, Packet-Switched) or a circuit-switched domain (CS), and the network side selects different timers according to different domains.
  • PS packet-switched domain
  • CS circuit-switched domain
  • Step 106 The network side sends an accept message to the UE, and the process ends.
  • the network side accepts a signaling request of the UE, and the UE and the network side continue to communicate.
  • the network side may send the acceptance signaling to the UE after no congestion or congestion is released.
  • the scenario in this embodiment is: The UE sends mobility management signaling to the network side, as shown in FIG. 4, including the following steps:
  • Step 201 The UE sends mobility management signaling to the network side.
  • the mobility management signaling includes one or a combination of the following: attach, TAU/RAU/LAU, service request;
  • the signaling may include or not include APN information.
  • Step 202 Whether the network side is congested, if yes, go to step 203, otherwise go to step 206.
  • the network side is a core network, and includes at least one of the following: MME/SGSN, Serving-GW (service gateway), P-GW (PDN-GateWay, packet data network gateway).
  • the congestion includes: APN congestion and general congestion;
  • the steering step If the signaling sent by the UE includes the APN, and the network side detects APN congestion, then the steering step
  • the network side detects congestion, that is, general congestion, then proceeds to step 203;
  • step 206 If the signaling sent by the UE includes the APN but the network side detects that the APN is not congested, then go to step 206;
  • Step 203 Whether the signaling is a low priority. If yes, go to step 204, otherwise go to step 205.
  • Step 204 The network side sends a reject message to the UE, and includes a back-off timer for the low priority in the message.
  • the UE After the UE receives the reject message, within the time of the backoff timer (before the backoff timer expires), unless the high priority, emergency service, called service, the UE should not initiate mobility management signaling of other services; When receiving a paging message, the UE should stop the Mobility Management back-off Timer. And can issue a business request process;
  • the MME When congestion control is performed on an APN, the MME stores the Mobility Management back-off Timer and rejects the mobility management procedure from the UE for the APN. If the MME contains the context of the UE, the MME may store a back-off Timer for each UE. When the back-off Timer is running, the UE will not initiate any NAS signaling for the mobility management process of this APN;
  • the Mobility Management back-off Timer should not affect the Cell/RAT and PLMN handover. When the Cell/RAT and TA are switched, the Mobility Management back-off Timer should not stop. The back-off Timer stops only when the new PLMN is not the equivalent PLMN (EPLMN, Equivalent PLMN).
  • the MME In connected mode, the MME should not reject the TAU, while in idle mode, the MME can reject the TAU and include a back-off Timer in the reject message.
  • the MME shall adjust the terminal reachable time and the Implicit Detach Timer to ensure that the MME is within the back-off Timer running time.
  • the MME does not have an Implicit Detach terminal.
  • the back-off timer is related to the PS or CS domain requested by the UE, that is, there are different timers for different domains.
  • Step 205 The network side sends a reject message to the UE, and includes a backoff timer for the normal priority in the message.
  • the UE After the UE receives the reject message, within the time of the backoff timer (before the backoff timer expires), unless the high priority, emergency service, called service, the UE should not initiate mobility management signaling of other services; Upon receiving the paging message, the UE shall stop the Mobility Management back-off Timer and may issue a service request procedure;
  • the MME When congestion control is performed on an APN, the MME stores Mobility Management back-off.
  • the MME may store a back-off Timer for each UE.
  • the UE will not initiate any NAS signaling for the mobility management procedure of this APN;
  • the Mobility Management back-off Timer should not affect the Cell/RAT and PLMN handover.
  • the Mobility Management back-off Timer should not stop when the Cell/RAT and TA are switched.
  • the back-off Timer stops only when the new PLMN is not an equivalent PLMN (EPLMN, Equivalent PLMN).
  • the MME In connected mode, the MME should not reject the TAU, while in idle mode, the MME can reject the TAU and include a back-off Timer in the reject message.
  • the MME shall adjust the terminal reachable time and the Implicit Detach Timer to ensure that the MME does not implicit the Detentive terminal during the back-off Timer running time.
  • the back-off timer is related to the PS or CS domain requested by the UE, that is, there are different timers for different domains.
  • Step 206 The network side sends an accept message to the UE, and the process ends.
  • the scenario in this embodiment is: The UE sends session management signaling to the network side, as shown in FIG. 5, including the following steps:
  • Step 301 The UE sends session management signaling to the network side.
  • the session management signaling includes: a PDN connection, a bearer resource allocation, or a resource modification request;
  • the session management signaling is for the APN, that is, the signaling contains APN information.
  • the network side is congested. If yes, go to step 303, otherwise go to step 306.
  • the network side is a core network, and includes at least one of the following: MME/SGSN, Serving-GW (Service Gateway), P-GW (PDN-GateWay, Packet Data Network Gateway).
  • the MME/SGSN When an APN is detected to be congested, the MME/SGSN shall run a Session Management back-off Timer and reject the session request message (including PDN connection, bearer resource allocation or resource modification request, etc.) from the UE for the APN;
  • the Session Management back-off Timer in the MME/SGSN is ⁇ for each UE and APN;
  • the Session Management back-off Timer should be cleared before the MME/SGSN sends a Session Management Request message to the UE.
  • Step 303 Whether the signaling is a low priority. If yes, go to step 304, otherwise go to step 305.
  • Step 304 The network side sends a reject message to the UE, and includes a back timer for the low priority in the message.
  • the UE After obtaining the Session Management back-off Timer from the EPS session management reject message, the UE should take the following measures:
  • the UE will not initiate the management of this APN service.
  • the UE will not initiate a service management process without APN.
  • the UE When the Session Management back-off Timer is running, the UE allows to initiate Service User, Emergency Service, and Mobile Terminated Services.
  • the UE shall terminate the Session Management back-off Timer.
  • the UE may initiate a PDN teardown process.
  • the UE shall support setting the Session Management back-off for each APN distribution activated by the UE.
  • the back-off timer is related to the PS or CS domain requested by the UE, that is, there are different timers for different domains.
  • Step 305 The network side sends a reject message to the UE, and includes a backoff timer for the normal priority in the message.
  • the UE After obtaining the Session Management back-off Timer from the EPS session management reject message, the UE should take the following measures: If a known APN is included in the reject message, the UE will not initiate a traffic management procedure for this APN.
  • the UE will not initiate a service management process without APN.
  • the UE When the Session Management back-off Timer is running, the UE allows to initiate Service User, Emergency Service, and Mobile Terminated Services.
  • the UE shall terminate the Session Management back-off Timer.
  • the UE may initiate a PDN teardown process.
  • the UE shall support setting the Session Management back-off Timer for each APN activated by the UE.
  • the back-off timer is related to the PS or CS domain requested by the UE, that is, there are different timers for different domains.
  • Step 306 The network side sends an accept message to the UE, and the process ends.
  • the present invention further provides a system for setting a back-off timer.
  • the method includes: an MME/SGSN, an eNB, and a UE, where:
  • the MME/SGSN is configured to receive the non-access stratum signaling sent by the UE, and after determining that the network is congested, sending a reject message to the UE according to the priority carried in the non-access stratum signaling, carrying Priority backoff timer; also used to keep the back-off Timer running when the Cell/TA/PLMN/RAT handover is performed; also used to send an accept message to the UE after no congestion or network congestion is removed; The size of the back-off timer adjusts the values of other related timers;
  • An eNB configured to transmit NAS signaling between the MME/SGSN and the UE;
  • the UE is configured to send the NAS signaling to the MME/SGSN and accept the response message returned by the MME/SGSN, where the response message is an accept message or a reject message; the backoff timer carried in the hold reject message is saved; and is also used in the back timer In operation, unless high priority, emergency service or called service, other service requests cannot be initiated to the network side; also used when switching between Cell/TA/PLMN/RAT, Continue running with the back-off Timer;
  • the embodiment of the present invention further provides a network side, as shown in FIG. 7, including:
  • a congestion judging unit configured to determine whether the network is congested after receiving non-access stratum signaling sent by the user equipment
  • a response unit configured to send a reject message to the user equipment according to a priority carried in the non-access stratum signaling, and carry a backoff timer for the priority, after the congestion judging unit determines that the network is congested .
  • the backoff timer for the low priority is carried in the reject message
  • the refusal message carries a backoff timer for a normal priority, where the normal priority includes a specified access type.
  • the normal priority includes: a priority other than a high priority, and an emergency call and a low priority.
  • the congestion determining unit determines whether the network is congested according to the following manner:
  • the network side detects the APN congestion, or the non-access stratum signaling does not include the APN and the network side detects the general congestion, the network is congested.
  • the network side is an MME/SGSN.
  • the network side determines the value of the back-off timer according to the following manner: using a default value, or being set by the MME/SGSN, or being obtained by the MME/SGSN from other network elements.
  • the method provided by the embodiment of the present invention sets different backoff timers for different priorities to meet the delay requirements of different priorities.

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  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

一种设置后退定时器的方法，包括：网络侧收到用户设备发送的非接入层信令，判断网络拥塞后，根据所述非接入层信令中携带的优先级，向所述用户设备发送拒绝消息，携带针对所述优先级的后退定时器。一种网络侧。上述方法及网络侧对不同优先级的用户设备提供不同的后退定时器，满足不同优先级下的时延需求。

Description

设置后退定时器的方法和网络侧
技术领域
本发明涉及无线通信技术， 特别涉及一种设置后退定时器的方法和网络 侧。
背景技术
机器对机器（M2M, Machine to Machine )技术指机器之间建立连接的所 有技术和手段。 M2M理念在上个世纪九十年代就出现了，但是只停留在理论 阶段。 2000年以后， 随着移动通信技术的发展， 以移动通信技术实现机器设 备的联网成为可能。 2002年左右 M2M业务就在市场上出现， 并在随后的几 年迅速发展， 成为众多通信设备商和电信运营商的关注焦点。 目前全球的机 器数量比人的数量要多很多， 因此可以预见到 M2M技术良好的市场前景。
对 M2M通信应用场景的研究表明在移动网络上提供 M2M通信具有潜在 的市场前景。 但 M2M业务对系统提出了很多新的要求， 为了增强移动网络 在这方面的竟争力， 有必要对现有的移动网络进行优化， 以更有效的支持 M2M通信。
移动通信网络主要针对人与人的通信进行设计， 而对机器与机器、 人与 机器的通信则优化不足。 此外， 运营商如何能够以低成本提供 M2M通信服 务， 也是 M2M通信部署成功的关键。
基于以上情况， 有必要研究移动网络支持 M2M通信的解决方案。 解决 方案要最大限度重用现有网络， 降低大量 M2M通信对网络造成的影响以及 运营维护的复杂度。 目前电信市场竟争曰趋激烈， 资费不断下降， 运营商利润空间不断减小， 以人为基础的通信市场正在趋于饱和， M2M对运营商来说是全新的发展机 遇。
为了有效地利用移动网络资源， 第三代合作伙伴计划 （3GPP , 3rd Generation Partnership Project )提出了机器类型通信 ( MTC, Machine Type Communication ) , 包括 M2M、机器对人 ( Machine to Man )进行通讯的业务， 其业务范围远远超出了以往人对人 ( H2H, Human to Human )之间的通讯， MTC在接入控制、 计费、 安全性、 服务质量（QoS, Quality of Service ) 、 业 务模式等方面与现在的 H2H通讯模式有很大的区别。
3GPP演进分组系统（ EPS, Evolved Packet System )包括了无线接入网（如
UMTS陆地无线接入网（ UTRAN, Universal Terrestrial Radio Access Network )、 演进的 UTRAN ( E-UTRAN, Evolved UTRAN ) 、 GSM/EDGE无线接入网络 ( GERAN, GSM/EDGE Radio Access Network ) )和核心网。 在演进的分组 核心网 （EPC , Evolved Packet Core ) 中有移动管理实体 ( MME, Mobility Management Entity )、服务网关（ SG, Serving Gateway )、分组数据网（ PDN ) 网关（PGW, PDN Gateway )等网元； 在通用分组无线业务（GPRS )核心网 中包括服务 GPRS支持节点 （SGSN, Serving GPRS Support Node )等网元； 在 E-UTRAN中包括演进的节点 B ( eNB, evolved Node B ) 。 上述系统结构 如图 1所示。
MTC用户设备（即具有 MTC功能的用户设备） 的数量巨大， 因此可能 引起网络拥塞， 为了避免网络拥塞， 3GPP中提出了釆用后退时间的机制， 包 括会话管理后退定时器和移动管理后退定时器。 后退定时器一般由网络侧釆 用非接入层 ( Non Access Stratum , NAS )信令， 在拒绝消息中发送到 UE, 如图 2所示给出了 NAS信令的流程示意图：
(1)基于接入点名称 （APN, Access Point Name ) 会话管理的拥塞控 制
当某个 APN被检测出拥塞， MME应运行会话管理后退定时器（ Session Management back-off Timer ) , 并拒绝来自 UE的对于此 ΑΡΝ的 EPS会话管 理（EPS Session Management, ESM )请求消息（包括 PDN连接， 承载资源分 配或正在资源修改请求等）。 MME中的 Session Management back-off Timer是 基于每个 UE和 APN的。 当 MME发送会话管理请求消息给 UE前， 应该清 除 Session Management back-off Timer„
(2)产生 MM (移动管理） back-off Timer,并放在 UE上下文中，对 EPS 移动管理（EPS Mobility Management, EMM )信令进行控制。 但是对于处于 连接状态下的跟踪区域更新 (TAU, Tracking Area Updating)不应该拒绝 , 如在 切换过程中产生的 TAIL
在通用拥塞场景下， MME产生并运行 back-off Timer, 并拒绝来自终端 的移动性管理信令请求。 除了高优先级用户 （ Service User ) , 紧急服务 ( Emergency Services ) , 移动被叫月良务 ( Mobile Terminated Services )业务夕卜, UE不应发起其他业务的移动性管理消息。 当 UE收到寻呼（Paging )消息时， UE应停止 Mobility Management back-off Timer并可以发出业务请求流程。
MTC用户设备 UE对时延一般不敏感， 因此被认为属于低优先级 UE , 有些 MTC应用可以具有正常的优先级， 如实时的监控、 故障上报等， 普通 UE增加了 MTC功能模块可以作为 MTC用户设备；因此 UE可以具有双优先 级 (dual priority): 低优先级 ( low priority )和正常优先级 ( normal priority ) 。 在对现有技术的研究和实践过程中发现现有技术存在以下问题： 目前， 拥塞 管理釆用的后退定时器， 对低优先级和正常优先级不进行区分， 采用同一个 后退定时器； 对于双优先级 UE,在低优先级和正常优先级对时延的要求不一 样时， 釆用同一个后退定时器不符合双优先级 UE的需求。 发明内容
本发明要解决的技术问题是提供一种设置后退定时器的方法和网络侧， 满足双优先级 UE的后退处理需求。
为了解决上述问题， 本发明提供了一种设置后退定时器的方法， 包括： 网络侧收到用户设备发送的非接入层信令， 判断网络拥塞后， 根据所述 非接入层信令中携带的优先级， 向所述用户设备发送拒绝消息， 携带针对所 述优先级的后退定时器。
优选地， 上述方法还可具有以下特点， 所述携带针对所述优先级的后退 定时器包括： 当所述非接入层信令中携带的优先级为低优先级时， 携带针对 低优先级的后退定时器。
优选地， 上述方法还可具有以下特点， 所述携带针对所述优先级的后退 定时器包括： 当所述非接入层信令中携带的优先级为正常优先级时， 携带针 对正常优先级的后退定时器， 所述正常优先级包括指定接入类型。 优选地， 上述方法还可具有以下特点， 所述正常优先级包括： 除高优先 级， 以及紧急呼叫和低优先级之外的其他优先级。
优选地， 上述方法还可具有以下特点， 所述网络侧根据如下方式判断网 络是否拥塞： 当所述非接入层信令中包含接入点名称（APN )且网络侧检测 到所述 APN拥塞， 或者， 所述非接入层信令中不包含 APN且网络侧检测到 通用拥塞， 则网络拥塞。
优选地， 上述方法还可具有以下特点， 所述网络侧为移动管理实体 /服务 通用分组无线业务支持节点 （MME/SGSN ) 。
优选地， 上述方法还可具有以下特点， 所述后退定时器的数值为缺省值， 或者， 由所述 MME/SGSN设定，或者， 由所述 MME/SGSN从其它网元获取。
本发明还提供一种网络侧， 包括：
拥塞判断单元， 其设置为： 接收到用户设备发送的非接入层信令后， 判 断网络是否拥塞；
响应单元， 其设置为： 在所述拥塞判断单元判断网络拥塞后， 根据所述 非接入层信令中携带的优先级， 向所述用户设备发送拒绝消息， 携带针对所 述优先级的后退定时器。
优选地， 上述网络侧还可具有以下特点， 所述响应单元设置为： 在所述 拒绝消息中携带针对所述优先级的后退定时器包括： 当所述非接入层信令中 携带的优先级为低优先级时， 在所述拒绝消息中携带针对低优先级的后退定 时器。
优选地， 上述网络侧还可具有以下特点， 所述响应单元设置为： 在所述 携带针对所述优先级的后退定时器包括：
当所述非接入层信令中携带的优先级为正常优先级时， 在所述拒绝消息 中携带针对正常优先级的后退定时器， 所述正常优先级包括指定接入类型。
优选地， 上述网络侧还可具有以下特点， 所述正常优先级包括： 除高优 先级， 以及紧急呼叫和低优先级之外的其他优先级。
优选地， 上述网络侧还可具有以下特点， 所述拥塞判断单元设置为： 根 据如下方式判断网络是否拥塞：
当所述非接入层信令中包含 APN且网络侧检测到所述 APN拥塞，或者， 所述非接入层信令中不包含 APN且网络侧检测到通用拥塞， 则网络拥塞。
优选地， 上述网络侧还可具有以下特点， 所述网络侧为 MME/SGSN。 优选地， 上述网络侧还可具有以下特点， 所述网络侧设置为： 根据如下 方式确定所述后退定时器的数值： 使用缺省值， 或者， 由所述 MME/SGSN 设定， 或者， 由所述 MME/SGSN从其它网元获取。
本发明实施例提供的方法， 为不同优先级设定不同的后退定时器， 满足 不同优先级下的时延需求。 附图概述
图 1为 3GPP中的非漫游场景下的系统架构示意图；
图 2为 NAS信令示意图；
图 3为本发明设置后退定时器流程示意图；
图 4为本发明实施例一设置后退定时器示意图；
图 5为本发明实施例二设置后退定时器示意图；
图 6为本发明实施例设置后退定时器的系统结构示意图；
图 7为本发明实施例网络侧框图。 本发明的较佳实施方式
为使本发明的目的、 技术方案和优点更加清楚明白， 下文中将结合附图 对本发明的实施例进行详细说明。 需要说明的是， 在不冲突的情况下， 本申 请中的实施例及实施例中的特征可以相互任意组合。
本发明实施例提供一种设置后退定时器的方法， 包括：
网络侧收到用户设备发送的非接入层信令， 判断网络拥塞后， 根据所述 非接入层信令中携带的优先级， 向所述用户设备发送拒绝消息， 携带针对所 述优先级的后退定时器。 其中， 所述携带针对所述优先级的后退定时器包括：
当所述非接入层信令中携带的优先级为低优先级时， 携带针对低优先级 的后退定时器。
或者， 当所述非接入层信令中携带的优先级为正常优先级时， 携带针对 正常优先级的后退定时器， 所述正常优先级包括指定接入类型。
所述正常优先级是指： 除高优先级， 如接入类型为 11-15, 以及紧急呼叫 和低优先级之外的其他优先级。 所述正常优先级可以釆用现有的呼叫类型或 定义新的呼叫类型标识。
其中， 所述非接入层信令为移动管理信令或者会话管理信令；
所述针对所述优先级的后退定时器是指针对所述优先级的与所述非接入 层信令的信令类型对应的后退定时器。
其中， 所述网络侧根据如下方式判断网络是否拥塞：
当所述非接入层信令中包含 APN且网络侧检测到所述 APN拥塞，或者， 所述非接入层信令中不包含 APN且网络侧检测到通用拥塞， 则网络拥塞。
其中， 所述网络侧为 MME/SGSN。 其中， 所述后退定时器的数值为缺省 值， 或者， 由所述 MME/SGSN设定， 或者， 由所述 MME/SGSN从其它网元 获取。
本发明实施例提供的设置后退定时器的方法， 如图 3所示， 包括： 步骤 101 , UE向网络侧发送信令。
UE可以是双优先级， 也可以是更多优先级， 比如 3优先级； 本实施例中 以 UE具备两个优先级来进行说明， 但本发明不限于此。 另外， 本发明也可 以应用在 IJE只有一个优先级的情况。
所述信令为 NAS信令， 即与无线接入技术无关的， 独立于无线接入相关 的功能及流程， 包括移动管理信令和会话管理信令；
所述网络侧是指： MME或 SGSN;
所述信令中包含优先级指示信息， 如低优先级或正常优先级。
步骤 102, 网络侧判断是否拥塞， 如果是， 转向步骤 103 , 否则转向步骤 106。
所述拥塞是指核心网拥塞， 包括特定 APN拥塞和通用拥塞；
所述拥塞可以是 MME/SGSN主动检测到的， 或通过其他网元的指示消 息获得。
步骤 103 , 网络侧判断收到信令中携带的优先级， 如果是低优先级， 转 向步骤 104, 否则转向步骤 105。
步骤 104, 网络侧向 UE发送拒绝消息， 并在消息中包含针对低优先级的 后退定时器， 流程结束。
所述针对低优先级的后退定时器由网络侧 MME/SGSN确定， 并在拒绝 消息中通知 UE;
所述后退定时器的数值可以是缺省的， 或 MME/SGSN设定的， 或从其 他网元接收到的；
所述网络侧根据所述 UE的信令类型， 如移动管理或会话管理信令， 选 择相应的定时器。
需要指出的是： 所述网络侧可以是分组交换域 (PS, Packet-Switched)或电 路交换域 (CS, Circuit-Switched), 网络侧根据不同的域选择不同的定时器。
步骤 105 , 网络侧向 UE发送拒绝消息， 并在消息中包含针对正常优先级 的后退定时器， 流程结束。
所述针对正常优先级的后退定时器由网络侧 MME/SGSN确定， 并在拒 绝消息中通知 UE;
所述后退定时器的数值可以是缺省的， 或 MME/SGSN设定的， 或从其 他网元接收到的。
所述网络侧根据所述 UE的信令类型， 如移动管理或会话管理信令， 选 择相应的定时器。
需要指出的是： 所述网络侧可以是分组交换域 (PS, Packet-Switched)或电 路交换域 (CS, Circuit-Switched), 网络侧根据不同的域选择不同的定时器。
步骤 106, 网络侧向 UE发送接受消息， 流程结束。 所述网络侧接受 UE的信令请求 , 所述 UE和所述网络侧继续进行通信。 所述网络侧可以在没有拥塞或拥塞解除后， 向 UE发送接受信令。
下面通过具体的实施例对上述方案进行详细的描述：
实施例一
本实施例的场景是： UE向网络侧发送移动管理信令， 如图 4所示， 包括 以下步骤：
步骤 201 , UE向网络侧发送移动管理信令。
所述移动管理信令包括如下之一或其组合： 附着（attach) , TAU/RAU/LAU, 服务请求 (service request);
所述信令中可以包含 APN或不包含 APN信息。
步骤 202, 网络侧是否拥塞， 如果是， 转向步骤 203 , 否则转向步骤 206。 所述网络侧为核心网， 包括以下至少一种： MME/SGSN, Serving-GW (服 务网关）， P-GW ( PDN-GateWay, 分组数据网网关） .
所述拥塞包括： APN拥塞和通用拥塞；
如果 UE发送的信令包含 APN, 且网络侧检测到 APN拥塞， 则转向步骤
203;
如果 UE发送的信令不包含 APN, 网络侧检测到拥塞， 即通用拥塞， 则 转向步骤 203;
如果 UE发送的信令包含 APN但网络侧检测 APN没有拥塞， 则转向步 骤 206;
步骤 203 , 所述信令是否为低优先级， 如果是， 转向步骤 204, 否则转向 步骤 205。
步骤 204, 网络侧向 UE发送拒绝消息， 并在消息中包含针对低优先级的 后退定时器。
所述 UE收到拒绝消息后，在后退定时器的时间内 (后退定时器超时前）， 除非高优先级，紧急业务，被叫业务， UE不应发起其他业务的移动管理信令； 当 UE收到寻呼消息时， UE应停止 Mobility Management back-off Timer 并可以发出业务请求流程；
当对某 APN进行拥塞控制时， MME存储 Mobility Management back-off Timer, 并拒绝来自 UE对此 APN的移动性管理流程。 如果 MME中含有 UE 的上下文（Context ) , MME可以对每个 UE存储 back-off Timer。 当 back-off Timer运行时 , UE将不会发起任何针对此 APN的移动性管理流程的 NAS信 令；
Mobility Management back-off Timer应不影响 Cell/RAT和 PLMN切换。 Cell/RAT和 TA切换时， Mobility Management back-off Timer不应该停止。 只 有在新的 PLMN不是等效 PLMN ( EPLMN, Equivalent PLMN ) 时， back-off Timer 才停止。
在连接模式下， MME不应该拒绝 TAU, 而在空闲模式下， MME可以拒 绝 TAU, 并在拒绝消息中包含 back-off Timer。
如果 Mobility Management back-off Timer时间超过 UE周期 TAU+Implicit Detach Timer (隐式去附着定时器） , MME应调整终端可达时间和 Implicit Detach Timer ,用来保证 MME在 back-off Timer运行时间内， MME不会 Implicit Detach (隐式去附着 )终端。
所述后退定时器与 UE请求的 PS或 CS域有关， 即针对不同的域有不同 的定时器。
步骤 205 , 网络侧向 UE发送拒绝消息， 并在消息中包含针对正常优先级 的后退定时器。
所述 UE收到拒绝消息后，在后退定时器的时间内 (后退定时器超时前）， 除非高优先级，紧急业务，被叫业务， UE不应发起其他业务的移动管理信令； 当 UE收到寻呼消息时， UE应停止 Mobility Management back-off Timer 并可以发出业务请求流程；
当对某 APN进行拥塞控制时 , MME存储 Mobility Management back-off
Timer, 并拒绝来自 UE对此 APN的移动性管理流程。 如果 MME中含有 UE 的 Context, MME可以对每个 UE存储 back-off Timer。 当 back-off Timer运行 时， UE将不会发起任何针对此 APN的移动性管理流程的 NAS信令； Mobility Management back-off Timer应不影响 Cell/RAT和 PLMN切换。 Cell/RAT和 TA切换时， Mobility Management back-off Timer不应该停止。 只 有在新的 PLMN不是等效 PLMN ( EPLMN, Equivalent PLMN ) 时， back-off Timer 才停止。
在连接模式下， MME不应该拒绝 TAU, 而在空闲模式下， MME可以拒 绝 TAU, 并在拒绝消息中包含 back-off Timer。
如果 Mobility Management back-off Timer时间超过 UE周期 TAU+Implicit Detach Timer , MME应调整终端可达时间和 Implicit Detach Timer , 用来保证 MME在 back-off Timer运行时间内， MME不会 Implicit Detach终端。
所述后退定时器与 UE请求的 PS或 CS域有关， 即针对不同的域有不同 的定时器。
步骤 206, 网络侧向 UE发送接受消息， 流程结束。
实施例二
本实施例的场景是： UE向网络侧发送会话管理信令， 如图 5所示， 包括 以下步骤：
步骤 301 , UE向网络侧发送会话管理信令。
所述会话管理信令包括： PDN连接， 承载资源分配或正在资源修改请求 等；
所述会话管理信令针对 APN, 即信令中包含 APN信息。
步骤 302, 网络侧是否拥塞， 如果是， 转向步骤 303 , 否则转向步骤 306。 所述网络侧为核心网， 包括以下至少一种： MME/SGSN, Serving-GW (服 务网关）， P-GW ( PDN-GateWay , 分组数据网网关） 。
当某个 APN被检测出拥塞， MME/SGSN应运行 Session Management back-off Timer, 并拒绝来自 UE的对于此 APN的会话请求消息（包括 PDN连 接， 承载资源分配或正在资源修改请求等)；
MME/SGSN中的 Session Management back-off Timer ^^于每个 UE和 APN的； 当 MME/SGSN发送 Session管理请求消息给 UE前， 应该清除 Session Management back-off Timer„
步骤 303 , 所述信令是否为低优先级， 如果是， 转向步骤 304, 否则转向 步骤 305。
步骤 304, 网络侧向 UE发送拒绝消息， 并在消息中包含针对低优先级的 后退定时器。
当从 EPS会话管理拒绝消息中得到 Session Management back-off Timer 后， UE应釆取以下措施：
如果在拒绝消息中带已知 APN,则 UE将不会发起对此 APN业务管理流 程。
如果在拒绝消息中没带 APN,则 UE将不会发起不带 APN的业务管理流 程。
在 Cell/TA/PLMN/RAT切换时， Session Management back-off Timer继续 运行。
在 Session Management back-off Timer运行时 , UE允许发起 Service User, 紧急业务, Mobile Terminated Services。
如果 UE接收到网络初始的对拥塞 APN的 EPS Session管理请求消息， UE应终止 Session Management back-off Timer„
Session Management back-off Timer运行时， UE可以发起 PDN拆除过程。 UE应支持对 UE激活的每个 APN分布设置 Session Management back-off
Timer„
所述后退定时器与 UE请求的 PS或 CS域有关， 即针对不同的域有不同 的定时器。
步骤 305 , 网络侧向 UE发送拒绝消息， 并在消息中包含针对正常优先级 的后退定时器。
当从 EPS会话管理拒绝消息中得到 Session Management back-off Timer 后， UE应釆取以下措施： 如果在拒绝消息中带已知 APN,则 UE将不会发起对此 APN业务管理流 程。
如果在拒绝消息中没带 APN,则 UE将不会发起不带 APN的业务管理流 程。
在 Cell/TA/PLMN/RAT切换时， Session Management back-off Timer继续 运行。
在 Session Management back-off Timer运行时, UE允许发起 Service User, 紧急业务, Mobile Terminated Services。
如果 UE接收到网络初始的对拥塞 APN的 EPS Session管理请求消息， UE应终止 Session Management back-off Timer。
Session Management back-off Timer运行时， UE可以发起 PDN拆除过程。
UE应支持对 UE激活的每个 APN分别设置 Session Management back-off Timer„
所述后退定时器与 UE请求的 PS或 CS域有关， 即针对不同的域有不同 的定时器。
步骤 306, 网络侧向 UE发送接受消息， 流程结束。
为了实现上述方法， 本发明还提出了一种设置后退定时器的系统， 如图 6所示， 包括： MME/SGSN, eNB, UE, 其中：
MME/SGSN, 用于收到 UE发送的非接入层信令， 判断网络拥塞后， 根 据所述非接入层信令中携带的优先级， 向所述 UE发送拒绝消息， 携带针对 所述优先级的后退定时器； 还用于在 Cell/TA/PLMN/RAT 切换时， 保持 back-off Timer继续运行； 还用于在没有拥塞或网络拥塞解除后向 UE发送接 受消息； 还用于根据后退定时器的大小调整其他相关定时器的数值；
eNB , 用于在 MME/SGSN和 UE之间传递 NAS信令；
UE, 用于向 MME/SGSN发送 NAS信令和接受 MME/SGSN返回的响应 消息， 所述响应消息为接受消息或拒绝消息； 保存拒绝消息中携带的后退定 时器； 还用于在后退定时器运行时， 除非高优先级， 紧急业务或被叫业务， 不能向网络侧发起其他业务请求； 还用于在 Cell/TA/PLMN/RAT切换时， 保 持 back-off Timer继续运行；
本发明实施例还提供一种网络侧， 如图 7所示， 包括：
拥塞判断单元， 用于接收到用户设备发送的非接入层信令后， 判断网络 是否拥塞；
响应单元， 用于在所述拥塞判断单元判断网络拥塞后， 根据所述非接入 层信令中携带的优先级， 向所述用户设备发送拒绝消息， 携带针对所述优先 级的后退定时器。
其中， 所述响应单元在所述拒绝消息中携带针对所述优先级的后退定时 器包括：
当所述非接入层信令中携带的优先级为低优先级时， 在所述拒绝消息中 携带针对低优先级的后退定时器；
或者，
当所述非接入层信令中携带的优先级为正常优先级时， 在所述拒绝消息 中携带针对正常优先级的后退定时器， 所述正常优先级包括指定接入类型。
其中， 所述正常优先级包括： 除高优先级， 以及紧急呼叫和低优先级之 外的其他优先级。
其中， 所述拥塞判断单元根据如下方式判断网络是否拥塞：
当所述非接入层信令中包含 APN且网络侧检测到所述 APN拥塞，或者， 所述非接入层信令中不包含 APN且网络侧检测到通用拥塞， 则网络拥塞。
其中， 所述网络侧为 MME/SGSN。
其中， 所述网络侧根据如下方式确定所述后退定时器的数值： 使用缺省 值， 或者， 由所述 MME/SGSN设定， 或者， 由所述 MME/SGSN从其它网元 获取。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保护 范围。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上迷实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以采用 硬件的形式实现， 也可以采用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
工业实用性
本发明实施例提供的方法， 为不同优先级设定不同的后退定时器， 满足 不同优先级下的时延需求。

Claims

权 利 要 求 书
1、 一种设置后退定时器的方法， 包括：
网络侧收到用户设备发送的非接入层信令， 判断网络拥塞后， 根据所述 非接入层信令中携带的优先级， 向所述用户设备发送拒绝消息， 携带针对所 述优先级的后退定时器。
2、 如权利要求 1所述的方法， 其中， 所述携带针对所述优先级的后退定 时器包括：
当所述非接入层信令中携带的优先级为低优先级时， 携带针对低优先级 的后退定时器。
3、 如权利要求 1所述的方法， 其中， 所述携带针对所述优先级的后退定 时器包括：
当所述非接入层信令中携带的优先级为正常优先级时， 携带针对正常优 先级的后退定时器， 所述正常优先级包括指定接入类型。
4、如权利要求 3所述的方法，其中， 所述正常优先级包括： 除高优先级， 以及紧急呼叫和低优先级之外的其他优先级。
5、 如权利要求 1所述的方法， 其中， 所述网络侧根据如下方式判断网络 是否拥塞：
当所述非接入层信令中包含接入点名称（ APN )且网络侧检测到所述 APN 拥塞， 或者， 所述非接入层信令中不包含 APN且网络侧检测到通用拥塞， 则 网络拥塞。
6、 如权利要求 1至 5任一所述的方法， 其中， 所述网络侧为移动管理实 体 /服务通用分组无线业务支持节点 （MME/SGSN ) 。
7、 如权利要求 6所述的方法， 其中， 所述后退定时器的数值为缺省值， 或者， 由所述 MME/SGSN设定，或者， 由所述 MME/SGSN从其它网元获取。
8、 一种网络侧， 包括：
拥塞判断单元， 其设置为： 接收到用户设备发送的非接入层信令后， 判 断网络是否拥塞； 响应单元， 其设置为： 在所述拥塞判断单元判断网络拥塞后， 根据所述 非接入层信令中携带的优先级， 向所述用户设备发送拒绝消息， 携带针对所 述优先级的后退定时器。
9、 如权利要求 8所述的网络侧， 其中， 所述响应单元设置为： 在所述拒 绝消息中携带针对所述优先级的后退定时器包括：
当所述非接入层信令中携带的优先级为低优先级时， 在所述拒绝消息中 携带针对低优先级的后退定时器。
10、 如权利要求 8所述的网络侧， 其中， 所述响应单元设置为： 在所述 携带针对所述优先级的后退定时器包括：
当所述非接入层信令中携带的优先级为正常优先级时， 在所述拒绝消息 中携带针对正常优先级的后退定时器， 所述正常优先级包括指定接入类型。
11、 如权利要求 10所述的网络侧， 其中， 所述正常优先级包括： 除高优 先级， 以及紧急呼叫和低优先级之外的其他优先级。
12、 如权利要求 8所述的网络侧， 其中， 所述拥塞判断单元设置为： 根 据如下方式判断网络是否拥塞：
当所述非接入层信令中包含 APN且网络侧检测到所述 APN拥塞，或者， 所述非接入层信令中不包含 APN且网络侧检测到通用拥塞， 则网络拥塞。
13、 如权利要求 8 至 12 任一所述的网络侧， 其中， 所述网络侧为 MME/SGSNo
14、 如权利要求 13所述的网络侧， 其中， 所述网络侧设置为： 根据如下 方式确定所述后退定时器的数值： 使用缺省值， 或者， 由所述 MME/SGSN 设定， 或者， 由所述 MME/SGSN从其它网元获取。
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