WO2012103773A1 - 中继系统的过载控制方法及系统 - Google Patents
中继系统的过载控制方法及系统 Download PDFInfo
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- WO2012103773A1 WO2012103773A1 PCT/CN2011/084669 CN2011084669W WO2012103773A1 WO 2012103773 A1 WO2012103773 A1 WO 2012103773A1 CN 2011084669 W CN2011084669 W CN 2011084669W WO 2012103773 A1 WO2012103773 A1 WO 2012103773A1
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- message
- denb
- offload
- handover
- release
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
Definitions
- the present invention relates to an overload control technique in a wireless communication system, and more particularly to an overload control method and system for a relay system. Background technique
- EPS Evolved Packet
- System is a schematic structural diagram of an evolved packet system.
- the entire EPS system includes an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and an evolved packet core network (EPC, Evolved). Packet Core) two parts.
- EPC Evolved Universal Terrestrial Radio Access Network
- GERAN GSM EDGE Radio Access Network
- UTRAN Universal Terrestrial Radio Access Network
- the Home Subscriber Server HSS
- MME Mobility Management Entity
- S-GW Serving Gateway
- P-GW Packet Data Gateway
- PCRF Policy and Charging Rule Function
- the home subscriber server is the permanent storage location of the subscriber's subscription data, and is located in the home network to which the subscriber subscribes.
- the mobility management entity is the location where the user subscription data is stored in the current network, and is responsible for the non-access layer signaling management of the user equipment (UE, User Equipment) to the network, the security verification function of the user equipment, and the mobility management of the user equipment. Tracking and paging management functions in user idle mode Can and bear management.
- UE User Equipment
- the service gateway is a gateway of the core network to the wireless system, and is responsible for user plane bearer of the user equipment to the core network, data buffering in the idle mode of the user equipment, a function of initiating a service request by the network side, lawful interception, and packet data routing and forwarding functions;
- the service gateway is responsible for counting the situation in which the user equipment uses the wireless network, and generates a CDR of the user equipment using the wireless network, and transmits the CDR to the charging gateway.
- the packet data gateway is a gateway of the evolved system and the external packet data network of the system, and is connected to the Internet and the packet data network, and is responsible for the Internet Protocol (IP) address allocation, the charging function, the packet filtering, and the user equipment.
- IP Internet Protocol
- the monthly GPRS support node is a service support point for GERAN and UTRAN users to access the core network. It is similar in function to the mobility management entity and is responsible for user location update, paging management, and bearer management.
- PCRF Policy and Charging Enforcement Function
- QoS quality of service
- Figure 2 is a schematic diagram of the network architecture after the introduction of the relay. As shown in Figure 2, the network architecture after the introduction of the relay node includes the following network elements:
- the relay node mainly implements two functions, namely, functions as a UE and as a relay node. That is to say, the RN can be used as a UE to access the communication network and establish a bearer and other related operations, and on the other hand, the eNB provides an access service for the UE.
- a donor base station (DeNB, Donor eNodeB), which provides radio access for the RN, terminates Radio Resource Control (RRC) signaling of the RN as the UE, and terminates the S1 application protocol (S1AP) of the RN as the eNB. , SI Application Protocol) signaling and X2 signaling.
- the DeNB also has a function of an SGW and a P-GW that are RNs of the UE.
- the relay node operator (RN OAM, Relay Node Operator and Management), the RN will obtain the necessary link information from the RN OAM.
- the MME and the eNB that provide the RN as the UE need to have corresponding enhanced functions. Therefore, it is necessary to ensure that the RN can select the enhanced eNB and the MME.
- the UE can access the network through the RN, and the DeNB selects the MME for the UE, and the MME can be an enhanced MME or an ordinary MME.
- the MME function needs to be enhanced due to the introduction of the RN function. Therefore, when establishing a link for the RN, the DeNB needs to select an MME supporting the RN function for the RN.
- FIG. 3 is a flowchart of an existing MME offloading a UE. As shown in FIG. 3, the MME uninstalling the UE specifically includes the following steps:
- Step 301 The MME selects part or all of the UE to perform offloading. For the UE that needs to be offloaded, the MME sends a UE context release command to the eNB, which carries the release reason, indicating that the release is due to offload.
- Step 302 The eNB initiates release of the wireless air interface resource, where the release reason is carried out, and the reason for the release is the uninstallation.
- Step 303 The eNB returns a UE context release complete message to the MME.
- Step 304 The UE initiates an RRC link request and a TAU (Tacking Area Update) request, where the RRC link request does not include the registered MME identity information.
- RRC link request does not include the registered MME identity information.
- Step 305 The eNB selects, for the UE, the MME that does not exceed the load according to the request of the UE.
- Step 306 executing the remaining process of the TAU.
- the resources of the RN may be released, and the resources of the RN are The release will cause the UE to be disconnected from the network through the RN, which undoubtedly brings a poor access experience to the UE users, and the quality of service is degraded.
- the main purpose of the present invention is to provide an overload control method and system for a relay system, which can relieve the overload pressure by releasing a part of the UE accessing the RN when the system is overloaded, and can maximize the protection of the access UE.
- Business continuity can be provided.
- An overload control method for a relay system comprising:
- the donor base station DeNB After receiving the offload message sent by the network side, the donor base station DeNB offloads the user equipment UE accessing the RN according to the unloading policy configured by itself.
- the offloading the UE that accesses the RN according to the self-configured offloading policy is: after receiving the unloading message, the DeNB determines, according to the offloading policy configured by itself, the UE that needs to perform handover, and sends a handover indication to the RN. a message, where the handover indication message carries the identifier information of the UE to be handed over;
- the RN performs handover according to the identification information of the to-be-switched UE.
- the offload message is a UE context release message or an overload start message.
- the method further includes: after the DeNB determines that the RN performs handover of the UE to be handed over, sends a UE context release complete message to the network side, and releases the message. Remaining UEs accessed by the RN and/or releasing the RNo
- the method further includes: determining, by the DeNB, that the RN performs the handover of the UE to be switched, determining whether to release the remaining UE accessed by the RN, and The remaining UEs accessed through the RN are released.
- the method further includes:
- the DeNB When the DeNB receives the UE context release message after receiving the overload start message, After performing the handover of the UE to be handed over, the RN directly sends a UE context release complete message to the network side, and releases the remaining UEs accessed through the RN and/or releases the RNo.
- the uninstallation strategy is:
- the UE in the emergency service is handed over, and/or the UE in the service higher than the set level is switched, and/or the UE with the priority level higher than the set level is switched, and/or , randomly select a set number of UEs to switch.
- the identifier information of the UE to be switched is:
- An overload control system for a relay system where the system includes an RN, a DeNB, and a UE;
- the DeNB is configured to: after receiving the offload message sent by the network side, offload the user equipment UE that accesses the RN according to the offload policy configured by itself.
- the DeNB is further configured to: after receiving the offload message, determine, according to the offload policy configured by itself, the UE that needs to perform handover, and send a handover indication message to the RN;
- the handover indication message carries the identifier information of the UE to be switched;
- the RN is further configured to perform handover according to the identifier information of the to-be-switched UE;
- the offload message is a UE context release message or an overload start message.
- the DeNB is further configured to: after determining that the RN performs handover of the UE to be handed over, send a UE context release complete message to the network side, and release the passthrough Remaining UEs accessed by the RN and/or releasing the RN.
- the DeNB is further configured to: after determining that the RN performs the handover of the UE to be handed over, determine whether to release the remaining UEs accessed by the RN, and release the pass The remaining UEs accessed by the RN.
- the offloading policy is: switching a UE in an emergency service, and/or, The UEs in the traffic higher than the set level are switched, and/or the UEs having the priority level higher than the set level are switched, and/or the set number of UEs are randomly selected for handover.
- an RN offload message or an overload start message is sent to the DeNB, and after receiving the message, the donor base station does not immediately release the RN and the DeNB.
- the unloading policy configured by itself the UEs that are accessed through the RN are first switched, and the UEs are switched to other base stations or RNs, and then the remaining UEs accessed through the RN are released. Or it is not necessary to release the remaining UEs accessed through the RN.
- the invention can be realized without major modifications to the existing communication system, and the convenience of realization of the technical solution is ensured.
- 1 is a schematic structural diagram of an evolved packet system
- FIG. 2 is a schematic diagram of a network architecture after the introduction of the Relay
- FIG. 3 is a flowchart of an existing MME offloading a UE
- FIG. 5 is a flowchart of an overload control method of a relay system according to Embodiment 2 of the present invention. detailed description
- Step 401 The MME determines to uninstall the RN, and the MME The DeNB sends a UE context release command, where the reason for the release is carried out, and the reason for the release is the offload. Due to the current system load, If the set load threshold is exceeded, the network side determines that the RN needs to be unloaded for consideration of communication system protection.
- Step 402 The DeNB releases the RN according to the indication of the network side, and suspends releasing the RRC link.
- the DeNB learns which UEs are accessed from the RN according to the previously stored mapping relationship between the UE and the RN. For UEs accessing from the RN, the DeNB may determine whether to release the UEs according to the offload policy, or switch them to other base stations (such as other RNs, DeNBs, or ordinary eNBs).
- the offloading policy is specifically: switching the UE in the emergency service, and/or switching the UE in the service higher than the set level, and/or performing the UE with the priority level higher than the set level. Switching, and/or, randomly selecting a set number of UEs to switch.
- the offloading strategy is flexible, and the purpose is to switch some UEs to other RNs, DeNBs, or common eNBs first, so as to alleviate the load of the current load and ensure the access through the RN.
- the UE to be released is UE1
- the UE that needs to be handed off is UE2.
- Both UE1 and UE2 represent a type of UE.
- the process described below is based on one UE. If multiple UEs need to perform handover operations, steps 403 to 406 and steps 408 to 409 need to be performed multiple times. .
- the DeNB after receiving the command of the network side to release the RN, the DeNB does not immediately release the link between the DeNB and the RN, but needs to access the part through the RN according to the uninstall policy set by itself.
- the UE switches to a better RN, a normal base station or a DeNB in the network environment, and then releases the remaining UEs accessed through the RN.
- Step 403 The DeNB sends a handover indication message to the RN, where the identifier information of the UE is carried, and the identifier may be an S1-AP link identifier in the UE context, or other identifier information that can identify the UE2, such as a global mobile subscriber identity (IMSI, International Mobile) Subscriber Identity) and so on.
- Step 404 The RN initiates a handover procedure for the UE2 according to the identifier information of the UE2, and first requests a measurement report.
- Step 405 Perform a normal switching process, which is exactly the same as the existing process, and is not described here.
- Step 406 After the handover is completed, the RN sends a handover complete message to the DeNB.
- the RN may send a handover completion message to the DeNB after receiving the handover command sent by the DeNB.
- the RN sends a handover complete message after receiving the UE context release command of the source MME of the UE forwarded by the DeNB.
- step 406 is optional. That is, if the DeNB can learn that the UE handover is completed by other means, the RN may not send a handover complete message to the DeNB. For example, the DeNB may determine that the handover is completed according to the handover command message sent by the source MME of the UE or the UE context release command sent by the MME of the source UE in the normal handover process.
- Step 407 After completing the handover of all selected UEs, the DeNB sends a UE context release complete message to the MME.
- the DeNB After the DeNB determines to complete the handover of all selected UEs, it sends a UE context release complete message to the MME to perform the release of the UE.
- Steps 408 to 409 the DeNB releases the remaining UEs accessed through the RN.
- FIG. 5 is a flowchart of an overload control method of a relay system according to Embodiment 2 of the present invention. As shown in FIG. 5, in this example, in order to reduce an offload delay and minimize the impact on a high priority user, this example is shown in FIG. The DeNB starts the handover process when receiving the overload start message.
- the overload control method of the relay system of this example specifically includes the following steps:
- Step 501 The MME is overloaded, and sends an overload start message to the DeNB.
- Step 502 The DeNB decides whether to switch the UE accessed by the RN according to the need, instead of releasing the link with the RN.
- the DeNB maps based on the previously saved UE and RN. System, to know which UEs access from the RN. For UEs accessing from the RN, the DeNB may determine whether to release the UEs according to the offload policy, or switch them to other base stations (RN, DeNB or normal eNB).
- the offloading policy is specifically: switching the UE in the emergency service, and/or switching the UE in the service higher than the set level, and/or performing the UE with the priority level higher than the set level. Switching, and/or, randomly selecting a set number of UEs to switch.
- the offloading strategy is flexible, and the purpose is to switch some UEs to other RNs, DeNBs, or common eNBs first, so as to alleviate the load of the current load and ensure the access through the RN.
- the DeNB after receiving the overload start message, the DeNB performs an offload policy, and performs handover on the UE to be handed over; thus, the DeNB receives the UE context release command sent by the MME (the MME determines that the release is required) because the handover is performed earlier.
- the handover execution may be completed, and the UE context release complete message is directly sent to the MME, and the release to the UE may be performed.
- the processing efficiency is improved.
- the UE to be released is UE1
- the UE that needs to be handed off is UE2.
- UE1 and UE2 both represent a type of UE. The process described below is based on one UE. If a handover operation needs to be performed on multiple UEs, steps 503 to 506 and steps 508 to 509 need to be performed multiple times. .
- the DeNB after receiving the command of the network side to release the RN, the DeNB does not immediately release the link between the DeNB and the RN, but needs to access the part through the RN according to the uninstall policy set by itself.
- the UE switches to a better RN, a normal base station, or a DeNB in the network environment, and then releases the remaining UEs accessed through the RN, or does not release the remaining UEs accessed through the RN.
- Step 503 The DeNB sends a handover indication message to the RN, where the identifier information of the UE is carried, and the identifier may be an S1-AP link identifier in the UE context, or other identifiers that may identify the UE2. Identification information, such as the IMSI of the UE.
- Step 504 The RN initiates a handover procedure to the UE2 according to the identity information of the UE2, and first requests a measurement report.
- Step 505 Perform a normal handover process, which is the same as the existing handover process, and details are not described herein again.
- Step 506 After the handover is completed, the RN sends a handover complete message to the DeNB.
- the RN may send a handover completion message to the DeNB after receiving the handover command sent by the DeNB.
- the RN sends a handover complete message after receiving the UE context release command of the source MME of the UE forwarded by the DeNB.
- step 506 is optional. That is, if the DeNB can learn that the UE handover is completed by other means, the RN may not send a handover complete message to the DeNB. For example, the DeNB may determine that the handover has been completed according to the handover command message sent by the MME of the source UE during the normal handover process or the UE context release command sent by the MME of the source UE.
- Step 507 After the DeNB completes the handover process of all the selected UEs, it determines whether the UE1 is to be released. If it is determined to be released, it performs steps 508 to 509; if it is determined not to be released, it may wait until the UE initiates the UE context release command. The release process is then initiated. In this step, after the handover is completed, the UE1 release is not necessarily performed. When the UE needs to be released, for example, the UE context release command sent by the MME is subsequently received, and then the release is initiated, and the UE context release completion message is returned to the MME, and the execution is performed. Release to the UE;).
- Step 508 to step 509 the DeNB releases the UE that needs to be released.
- the present invention also describes an overload control system of a relay system, which includes an RN, a DeNB, and a UE. It should be noted that the overload control system of the relay system of the present invention is mainly applied to a relay communication network system. Network structure and network elements constituting the above network structure, and present The network structure and the existing network elements are the same. The main difference is that the functions implemented by the foregoing network elements are different from those of the existing network elements, and the manner in which the foregoing network elements process messages is different. . In the following, the different functions implemented by the existing network elements will be mainly described.
- the overload control system of the present invention includes an RN, a DeNB, and a UE.
- the DeNB is configured to: after receiving the offload message sent by the network side, offload the user equipment UE accessing the RN according to the offload policy configured by itself.
- the DeNB After receiving the RN offload message, the DeNB is further configured to: after receiving the offload message, determine, according to the offload policy configured by itself, the UE that needs to perform handover, and send a handover indication message to the RN; where the handover indication message is Carrying identification information of the UE to be switched;
- the RN is further configured to perform handover according to the identifier information of the to-be-switched UE;
- the above offload message is a UE context release message or an overload start message.
- the DeNB is further configured to: after determining that the RN performs handover of the UE to be handed over, send a UE context release complete message to the network side, and release the access through the RN. Remaining UEs and/or release the RN.
- the DeNB is further configured to: after determining that the RN performs handover of the UE to be handed over, determine whether to release the remaining UEs accessed by the RN, and release the time through the RN The remaining UEs entered.
- the foregoing offloading strategy is: switching the UE in the emergency service, and/or switching the UE in the service higher than the set level, and/or performing the UE with the priority level higher than the set level. Switching, and/or, randomly selecting a set number of UEs to switch.
- the technical solution of the present invention can be implemented by performing corresponding upgrades on the DeNB and the RN.
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Abstract
本发明公开了一种中继系统的过载控制方法,包括:DeNB接收到网络侧发送的RN卸载消息或过载启动消息后,根据自身配置的卸载策略卸载接入到RN的用户设备UE。本发明同时公开了一种实现上述方法的中继系统的过载控制系统,包括RN、DeNB以及UE;其中,DeNB,用于接收到网络侧发送的RN卸载消息后,根据自身配置的卸载策略卸载接入到RN的用户设备UE。本发明保证了使部分业务优先级较高或用户优先级较高的UE的业务不会中断,最大程度保证了通过RN接入的UE的业务连续性。本发明不必对现有通信系统进行较大改动即可实现,保证了技术方案实现的便利性。
Description
中继系统的过载控制方法及系统 技术领域
本发明涉及无线通信系统中的过载控制技术, 尤其涉及一种中继系统 的过载控制方法及系统。 背景技术
为了保持第三代(3G, 3th Generation )移动通信系统在通信领域的竟 争力, 第三代合作伙伴计划 ( 3GPP, 3rd Generation Partnership Project )标 准工作组正致力于演进分组系统(EPS , Evolved Packet System ) 的研究。 图 1为演进分组系统的结构示意图, 如图 1所示, 整个 EPS系统包括演进 的通用陆地无线接入网络(E-UTRAN, Evolved Universal Terrestrial Radio Access Network )和演进的分组核心网( EPC, Evolved Packet Core )两部分。 EPC能够支持用户从 GSM EDGE无线接入网 ( GERAN, GSM EDGE Radio Access Network )和通用陆地无线接入网( UTRAN, Universal Terrestrial Radio Access Network )的接入。在 EPC中, 包含了归属用户服务器( HSS, Home Subscriber Server )、 移动性管理实体 ( MME, Mobility Management Entity )、 月良务网关( S-GW, Serving Gateway )、分组数据网关( P-GW, PDN Gateway ) 和策略计费规则功能实体( PCRF, Policy and Charging Rule Function )。 下 面详细介绍各部分所实现的功能:
归属用户服务器, 是用户签约数据的永久存放地点, 位于用户签约的 归属网。
移动性管理实体, 是用户签约数据在当前网络的存放地点, 负责用户 设备 ( UE, User Equipment )到网络的非接入层信令管理、 用户设备的安全 验证功能、 用户设备的移动性管理、 用户空闲模式下的跟踪和寻呼管理功
能和承载管理。
服务网关, 是核心网到无线系统的网关, 负责用户设备到核心网的用 户面承载、 用户设备空闲模式下的数据緩存、 网络侧发起业务请求的功能、 合法监听和分组数据路由和转发功能; 服务网关负责统计用户设备使用无 线网的情况, 并产生用户设备使用无线网的话单, 传送给计费网关。
分组数据网关, 是演进系统和该系统外部分组数据网络的网关, 它连 接到因特网和分组数据网络上, 负责用户设备的互联网协议(IP, Internet Protocol )地址分配、 计费功能、 分组包过滤、 策略控制等功能。
月良务 GPRS支持节点,是 GERAN和 UTRAN用户接入核心网络的业务 支持点, 功能上与移动性管理实体类似, 负责用户的位置更新、 寻呼管理 和承载管理等功能。
策略计费规则功能实体 (PCRF , Policy and Charging Enforcement Function ), 是演进系统中负责提供计费控制、 在线信用控制、 门限控制、 服务质量(QoS, Quality of Service )策略方面规则的服务器。
在某些场景下, 为了扩大无线覆盖范围, 或者临时性增加无线提供接 入用户的能力, 引入了中继 (Relay )节点的 ^既念。 图 2为引入 Relay后的 网络架构示意图, 如图 2所示, 在引入中继节点后的网络架构中, 包括以 下网元:
中继节点 (RN, Relay Node ), 主要实现两部分功能, 即作为 UE和作 为中继节点的功能。 也就是说, RN—方面可以作为 UE接入到通信网络中 并建立承载等相关操作, 另一方面作为 eNB为 UE提供接入服务。
供者基站(DeNB, Donor eNodeB ), 其为 RN提供无线接入, 终结了 作为 UE的 RN的无线资源控制 ( RRC, Radio Resource Control )信令, 终 结了作为 eNB的 RN的 S1应用协议 ( S1AP, SI Application Protocol )信令 以及 X2信令。 DeNB同时内置作为 UE的 RN的 SGW及 P-GW的功能。
中继节点的网关系统 ( RN OAM , Relay Node Operator and Management ) , RN会从 RN OAM中获得必要的链接信息。
当 RN作为 UE接入网络时, 对为该作为 UE的 RN提供服务的 MME 和 eNB都需要具有相应的增强功能, 因此需要保证 RN能够选择到增强的 eNB和 MME。
UE可以通过 RN接入网络, DeNB为 UE选择 MME, 该 MME可以是 增强过的 MME, 或者是普通的 MME。 由于 RN功能的引入而需对 MME 功能进行增强。 因此为 RN建立链接时, DeNB需要为 RN选择支持 RN功 能的 MME。
网络中的 MME在接入的 UE数量较多, 以及 UE建立业务的数量较多 的情况下, 可能在某一段时间内产生负荷过重的现象, MME可能会选择将 某些 UE卸载下去。另一方面,由于运营原因,需要在网络中移除某些 MME, 这些 MME上的 UE也需要被卸载下来。 图 3为现有 MME卸载 UE的流程 图, 如图 3所示, MME卸载 UE具体包括以下步驟:
步驟 301 , MME选择部分或者全部 UE进行卸载。对于需要卸载的 UE, MME向 eNB发送 UE上下文释放命令,其中携带释放原因,指示释放的原 因为卸载。
步驟 302, eNB发起无线空口资源的释放, 其中携带释放原因, 指示释 放的原因为卸载。
步驟 303 , eNB向 MME返回 UE上下文释放完成消息。
步驟 304, UE发起 RRC链接请求和跟踪区域更新 ( TAU, Tacking Area Update )请求, 其中 RRC链接请求中不包含注册过的 MME标识信息。
步驟 305, eNB根据 UE的请求为 UE选择未超过负荷的 MME。
步驟 306, 执行 TAU的剩余流程。
当 RN的 MME发生过负荷时, RN的资源可能被释放, 而 RN资源被
释放会导致通过 RN连接到网络上的 UE业务中断, 这无疑给 UE用户带来 了不佳的接入体验, 服务质量下降。 发明内容
有鉴于此, 本发明的主要目的在于提供一种中继系统的过载控制方法 及系统, 能在系统过载时尽量以释放部分接入 RN的 UE来緩解过载压力, 能最大限度地保护接入 UE的业务连续性。
为达到上述目的, 本发明的技术方案是这样实现的:
一种中继系统的过载控制方法, 所述方法包括:
供者基站 DeNB接收到网络侧发送的卸载消息后, 根据自身配置的卸 载策略卸载接入到 RN的用户设备 UE。
优选地, 所述根据自身配置的卸载策略卸载接入到 RN的 UE为: 所述 DeNB接收到卸载消息后, 根据自身配置的卸载策略确定出需进 行切换的 UE, 向所述 RN发送切换指示消息; 其中, 所述切换指示消息中 携带待切换 UE的标识信息;
所述 RN根据所述待切换 UE的标识信息执行切换。
优选地, 所述卸载消息为 UE上下文释放消息或过载启动消息。
优选地, 所述卸载消息为 UE上下文释放消息时, 所述方法还包括: 所述 DeNB确定所述 RN执行完对待切换 UE的切换后,向所述网络侧 发送 UE上下文释放完成消息,并释放通过所述 RN接入的剩余 UE和 /或释 放所述 RNo
优选地, 所述卸载消息为过载启动消息时, 所述方法还包括: 所述 DeNB确定所述 RN执行完对待切换 UE的切换后,判断是否释放 通过所述 RN接入的剩余 UE, 是时释放通过所述 RN接入的剩余 UE。
优选地, 所述方法还包括:
所述 DeNB在接收到过载启动消息后接收到 UE上下文释放消息时,在
所述 RN执行完对待切换 UE的切换后直接向所述网络侧发送 UE上下文释 放完成消息, 并释放通过所述 RN接入的剩余 UE和 /或释放所述 RNo
优选地, 所述卸载策略为:
将处于紧急业务中的 UE进行切换, 和 /或, 将处于高于设定等级的业 务中的 UE进行切换, 和 /或, 将优先级等级高于设定等级的 UE进行切换, 和 /或, 随机选择设定数量的 UE进行切换。
优选地, 所述待切换 UE的标识信息为:
UE上下文中的 S1应用协议 S1-AP链接标识, 和 /或, UE的全球移动 用户标识 IMSI。
一种中继系统的过载控制系统 , 所述系统包括 RN、 DeNB以及 UE; 其中,
DeNB , 用于在接收到网络侧发送的卸载消息后, 根据自身配置的卸载 策略卸载接入到 RN的用户设备 UE。
优选地, 所述 DeNB在接收到 RN卸载消息后还用于, 接收到卸载消 息后, 根据自身配置的卸载策略确定出需进行切换的 UE, 向所述 RN发送 切换指示消息; 其中, 所述切换指示消息中携带待切换 UE的标识信息; 所述 RN还用于, 根据所述待切换 UE的标识信息执行切换;
优选地, 所述卸载消息为 UE上下文释放消息或过载启动消息。
优选地, 所述卸载消息为 UE上下文释放消息时, 所述 DeNB还用于, 确定所述 RN执行完对待切换 UE的切换后, 向所述网络侧发送 UE上下文 释放完成消息, 并释放通过所述 RN接入的剩余 UE和 /或释放所述 RN。
优选地, 所述卸载消息为过载启动消息时, 所述 DeNB还用于, 确定 所述 RN执行完对待切换 UE的切换后,判断是否释放通过所述 RN接入的 剩余 UE, 是时释放通过所述 RN接入的剩余 UE。
优选地, 所述卸载策略为: 将处于紧急业务中的 UE进行切换, 和 /或,
将处于高于设定等级的业务中的 UE进行切换, 和 /或, 将优先级等级高于 设定等级的 UE进行切换, 和 /或, 随机选择设定数量的 UE进行切换。
本发明中, 当网络侧 ( MME )确定当前负荷过载时, 将会向 DeNB发 送 RN卸载消息或过载启动 ( overload start ) 消息, 供者基站接收到上述消 息后, 不会立即释放 RN与 DeNB之间的链接, 而是根据自身配置的卸载 策略, 先将通过 RN接入的部分 UE进行切换处理, 将这部分 UE切换到其 他的基站或 RN中, 然后再释放剩余的通过 RN接入的 UE或不必释放剩余 的通过 RN接入的 UE。 这样, 在当前系统负荷较高时, 保证了使部分业务 优先级较高或用户优先级较高的 UE的业务不会中断,最大程度保证了通过 RN接入的 UE的业务连续性。 本发明不必对现有通信系统进行较大改动即 可实现, 保证了技术方案实现的便利性。 附图说明
图 1为演进分组系统的结构示意图;
图 2为引入 Relay后的网络架构示意图;
图 3为现有 MME卸载 UE的流程图;
图 4为本发明实施例一的中继系统的过载控制方法流程图;
图 5为本发明实施例二的中继系统的过载控制方法流程图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚明白, 以下举实施例并 参照附图, 对本发明进一步详细说明。
图 4为本发明实施例一的中继系统的过载控制方法流程图, 如图 4所 示, 本示例的中继系统的过载控制方法具体包括以下步驟: 步驟 401 , MME决定卸载 RN, MME向 DeNB发送 UE上下文释放命 令, 其中携带释放原因, 指示释放的原因为卸载。 因当前系统负荷较高,
如超出了设定的负荷阈值, 出于对通信系统保护的考量, 网络侧确定需要 卸载 RN。
步驟 402, DeNB根据网络侧指示释放 RN,暂緩释放 RRC链接。 DeNB 根据之前保存的 UE和 RN的映射关系, 获知哪些 UE是从 RN接入的。 对 于从 RN接入的 UE, DeNB可以根据卸载策略判断是否释放这些 UE,或者 将其切换到其他基站(如其他的 RN、 DeNB或普通 eNB )。 卸载策略具体 为: 将处于紧急业务中的 UE进行切换, 和 /或, 将处于高于设定等级的业 务中的 UE进行切换, 和 /或, 将优先级等级高于设定等级的 UE进行切换, 和 /或, 随机选择设定数量的 UE进行切换。
本发明中, 卸载策略是灵活多变的,其宗旨是将部分 UE先切换至其他 的 RN、 DeNB或普通 eNB , 以减轻当前负载较高的 ΜΜΕ的负荷, 也保证 了通过 RN接入的部分 UE的业务连续性, 在这些 UE切换完毕后, 再释放 这些剩余的通过 RN接入的 UE。 只要不背离上述宗旨的卸载策略, 均应属 于本发明技术方案保护的范围。
本示例中, 假设需要释放的 UE为 UE1 , 需要切换出去的 UE为 UE2。 UE1和 UE2均代表一类 UE,如下说明的过程都是以一个 UE为例,如果需 要对多个 UE执行切换操作,则步驟 403~步驟 406,以及步驟 408~步驟 409 需要执行多次即可。 本发明中, 当 DeNB接收到网络侧指示释放 RN的命 令后, 并不会立即将 DeNB与 RN之间的链接直接释放, 而是需按照自身 设定的卸载策略,先将部分通过 RN接入的 UE切换到网络环境更好的 RN、 普通基站或 DeNB, 再进行剩余的通过 RN接入的 UE的释放。
步驟 403, DeNB向 RN发送切换指示消息, 其中携带 UE的标识信息, 该标识可以是 UE上下文中的 S1-AP链接标识, 或者其他可以标识 UE2的 标识信息如全球移动用户标识 ( IMSI , International Mobile Subscriber Identity )等。
步驟 404, RN根据 UE2的标识信息, 发起对 UE2的切换流程, 首先 请求测量报告。
步驟 405 , 执行正常的切换过程, 该过程与现有过程完全相同, 这里不 再赘述。
步驟 406, 切换完成后, RN向 DeNB发送切换完成消息。 在正常切换 过程中, RN在接收到 DeNB发送的切换命令后即可以向 DeNB发送切换完 成消息; 或者, RN在接收到 DeNB转发的 UE的源 MME的 UE上下文释 放命令后发送切换完成消息。
需要说明的是, 步驟 406是可选的。 也就是说, 如果 DeNB可以通过 其他方式获知 UE切换完成, RN可以不向 DeNB发送切换完成消息。 例如 DeNB可以根据在正常切换过程中, UE的源 MME发送的切换命令消息, 或者源 UE的 MME发送的 UE上下文释放命令判断切换已完成。
步驟 407, DeNB完成所选择所有 UE的切换后, 向 MME发送 UE上 下文释放完成消息。 本示例中, DeNB确定完成所选择所有 UE的切换后, 才向 MME发送 UE上下文释放完成消息, 才能执行对 UE的释放。
步驟 408~409, DeNB对剩余的通过 RN接入的 UE进行释放。
由于该释放过程为现有技术, 这里不再赘述其实现细节。
图 5为本发明实施例二的中继系统的过载控制方法流程图, 如图 5所 示, 本示例中, 为了减少卸载延时, 以及使对高优先级用户的影响降低到 最小, 本示例中, DeNB在接收到 overload start消息时就启动切换流程。 本 示例的中继系统的过载控制方法具体包括以下步驟:
步驟 501 , MME发生过载, 向 DeNB发送过载启动消息。
步驟 502, DeNB根据需要决定是否将通过 RN接入的 UE切换出去, 而不是释放与 RN之间的链接。 DeNB根据之前保存的 UE和 RN的映射关
系, 获知哪些 UE从 RN接入。 对于从 RN接入的 UE, DeNB可以根据卸 载策略判断是否释放这些 UE, 或者将其切换到其他基站(RN、 DeNB或普 通 eNB )。 卸载策略具体为: 将处于紧急业务中的 UE进行切换, 和 /或, 将 处于高于设定等级的业务中的 UE进行切换, 和 /或, 将优先级等级高于设 定等级的 UE进行切换, 和 /或, 随机选择设定数量的 UE进行切换。
本发明中, 卸载策略是灵活多变的,其宗旨是将部分 UE先切换至其他 的 RN、 DeNB或普通 eNB , 以减轻当前负载较高的 ΜΜΕ的负荷, 也保证 了通过 RN接入的部分 UE的业务连续性, 在这些 UE切换完毕后, 再释放 这些剩余的通过 RN接入的 UE。 只要不背离上述宗旨的卸载策略, 均应属 于本发明技术方案保护的范围。
本示例中, DeNB接收到过载启动消息后, 即执行卸载策略, 将待切换 的 UE进行切换; 这样, 由于切换执行的较早, DeNB在接收到 MME发送 的 UE上下文释放命令(MME确定需要释放接入的 UE ) 时, 切换执行可 能已完成, 直接向 MME发送 UE上下文释放完成消息, 执行对 UE的释放 即可。 与图 4所示的示例相比, 提高了处理效率。
本示例中, 假设需要释放的 UE为 UE1 , 需要切换出去的 UE为 UE2。 UE1和 UE2均代表一类 UE,如下说明的过程都是以一个 UE为例,如果需 要对多个 UE执行切换操作,则步驟 503~步驟 506, 以及步驟 508~步驟 509 需要执行多次即可。 本发明中, 当 DeNB接收到网络侧指示释放 RN的命 令后, 并不会立即将 DeNB与 RN之间的链接直接释放, 而是需按照自身 设定的卸载策略,先将部分通过 RN接入的 UE切换到网络环境更好的 RN、 普通基站或 DeNB, 再进行剩余的通过 RN接入的 UE的释放, 或不释放剩 余的通过 RN接入的 UE。
步驟 503, DeNB向 RN发送切换指示消息, 其中携带 UE的标识信息, 该标识可以是 UE上下文中的 S1-AP链接标识, 或者其他可以标识 UE2的
标识信息, 如 UE的 IMSI等。
步驟 504, RN根据 UE2的标识信息, 发起对 UE2的切换流程, 首先 请求测量报告。
步驟 505,执行正常的切换过程,该切换过程与现有切换过程完全相同, 这里不再赘述。
步驟 506, 切换完成后, RN向 DeNB发送切换完成消息。 在正常切换 过程中, RN在接收到 DeNB发送的切换命令后即可以向 DeNB发送切换完 成消息; 或者, RN在接收到 DeNB转发的 UE的源 MME的 UE上下文释 放命令后发送切换完成消息。
需要说明的是, 步驟 506是可选的。 也就是说, 如果 DeNB可以通过 其他方式获知 UE切换完成, RN可以不向 DeNB发送切换完成消息。 例如 DeNB可以根据在正常切换过程中, 源 UE的 MME发送的切换命令消息, 或者源 UE的 MME发送的 UE上下文释放命令判断切换已经完成。
步驟 507, DeNB完成所有选择 UE的切换过程之后,判断是否要将 UE1 释放, 如果判定为释放, 则执行步驟 508~步驟 509; 如果判定为不释放, 可能等到接收到 MME发起的 UE上下文释放命令之后再发起该释放过程。 本步驟中, 在切换完成后, 并不一定会执行 UE1 的释放 (当需要释放 UE 时,例如后续收到 MME发送的 UE上下文释放命令,再发起释放,向 MME 回复 UE上下文释放完成消息, 执行对 UE的释放即可;)。
步驟 508~步驟 509, DeNB对需要释放的 UE进行释放。
由于该释放过程为现有技术, 这里不再赘述其实现细节。
本发明还记载了一种中继系统的过载控制系统, 所述系统包括 RN、 DeNB以及 UE; 需要说明的是, 本发明的中继系统的过载控制系统主要应 用于中继通信网络系统中, 网络结构以及构成上述网络结构的网元, 与现
有的网络结构及现有网元都是相同的, 其主要区别在于, 上述各网元所实 现的功能与现有的网元有所不同, 并且, 上述各网元对消息处理的方式也 不同。 下面, 将主要将与现有网元所实现的不同功能进行描述。
本发明是中继系统的过载控制系统包括 RN、 DeNB 以及 UE; 其中, DeNB, 用于在接收到网络侧发送的卸载消息后, 根据自身配置的卸载策略 卸载接入到 RN的用户设备 UE。
上述 DeNB在接收到 RN卸载消息后还用于, 接收到卸载消息后, 根 据自身配置的卸载策略确定出需进行切换的 UE, 向所述 RN发送切换指示 消息; 其中, 所述切换指示消息中携带待切换 UE的标识信息;
所述 RN还用于, 根据所述待切换 UE的标识信息执行切换;
上述卸载消息为 UE上下文释放消息或过载启动消息。
上述卸载消息为 UE上下文释放消息时,所述 DeNB还用于,确定所述 RN执行完对待切换 UE的切换后, 向所述网络侧发送 UE上下文释放完成 消息, 并释放通过所述 RN接入的剩余 UE和 /或释放所述 RN。
上述卸载消息为过载启动消息时, 所述 DeNB还用于, 确定所述 RN 执行完对待切换 UE的切换后,判断是否释放通过所述 RN接入的剩余 UE, 是时释放通过所述 RN接入的剩余 UE。
上述卸载策略为: 将处于紧急业务中的 UE进行切换, 和 /或, 将处于 高于设定等级的业务中的 UE进行切换, 和 /或, 将优先级等级高于设定等 级的 UE进行切换, 和 /或, 随机选择设定数量的 UE进行切换。
具体实现时, 只要对 DeNB、 RN进行相应的升级即可实现本发明的技 术方案。
本领域技术人员应当理解, 上述的网络结构可参见现有协议的网络结 构以及图 4及图 5所示的各网元之间的交互流程而理解。 只要能实现本发 明的上述技术方案, 并不限定具体的实现结构。 本发明的系统中的各网元
所能实现的功能, 具体可参见前述图 4及图 5所示的各网元之间的交互流 程而理解。
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。
Claims
1、 一种中继系统的过载控制方法, 其特征在于, 所述方法包括: 供者基站 DeNB接收到网络侧发送的卸载消息后, 根据自身配置的卸 载策略卸载接入到 RN的用户设备 UE。
2、 根据权利要求 1所述的方法, 其特征在于, 所述根据自身配置的卸 载策略卸载接入到 RN的 UE为:
所述 DeNB接收到卸载消息后, 根据自身配置的卸载策略确定出需进 行切换的 UE, 向所述 RN发送切换指示消息; 其中, 所述切换指示消息中 携带待切换 UE的标识信息;
所述 RN根据所述待切换 UE的标识信息执行切换。
3、 根据权利要求 1 或 2所述的方法, 其特征在于, 所述卸载消息为 UE上下文释放消息或过载启动消息。
4、 根据权利要求 3所述的方法, 其特征在于, 所述卸载消息为 UE上 下文释放消息时, 所述方法还包括:
所述 DeNB确定所述 RN执行完对待切换 UE的切换后,向所述网络侧 发送 UE上下文释放完成消息,并释放通过所述 RN接入的剩余 UE和 /或释 放所述 RNo
5、 根据权利要求 3所述的方法, 其特征在于, 所述卸载消息为过载启 动消息时, 所述方法还包括:
所述 DeNB确定所述 RN执行完对待切换 UE的切换后,判断是否释放 通过所述 RN接入的剩余 UE, 是时释放通过所述 RN接入的剩余 UE。
6、 根据权利要求 3所述的方法, 其特征在于, 所述卸载策略为: 将处于紧急业务中的 UE进行切换, 和 /或, 将处于高于设定等级的业 务中的 UE进行切换, 和 /或, 将优先级等级高于设定等级的 UE进行切换, 和 /或, 随机选择设定数量的 UE进行切换。
7、 根据权利要求 3所述的方法, 其特征在于, 所述待切换 UE的标识 信息为:
UE上下文中的 S1应用协议 S1-AP链接标识, 和 /或, UE的全球移动 用户标识 IMSI。
8、一种中继系统的过载控制系统, 所述系统包括 RN、 DeNB以及 UE; 其特征在于:
DeNB , 用于在接收到网络侧发送的卸载消息后, 根据自身配置的卸载 策略卸载接入到 RN的用户设备 UE。
9、 根据权利要求 8 所述的系统, 其特征在于, 所述 DeNB在接收到 RN卸载消息后还用于, 接收到卸载消息后, 根据自身配置的卸载策略确定 出需进行切换的 UE, 向所述 RN发送切换指示消息; 其中, 所述切换指示 消息中携带待切换 UE的标识信息;
所述 RN还用于, 根据所述待切换 UE的标识信息执行切换。
10、 根据权利要求 9 所述的系统, 其特征在于, 所述卸载消息为 UE 上下文释放消息或过载启动消息。
11、 根据权利要求 10所述的系统, 其特征在于, 所述卸载消息为 UE 上下文释放消息时, 所述 DeNB还用于, 确定所述 RN执行完对待切换 UE 的切换后, 向所述网络侧发送 UE上下文释放完成消息, 并释放通过所述 RN接入的剩余 UE和 /或释放所述 RNo
12、 根据权利要求 10所述的系统, 其特征在于, 所述卸载消息为过载 启动消息时, 所述 DeNB还用于,确定所述 RN执行完对待切换 UE的切换 后, 判断是否释放通过所述 RN接入的剩余 UE, 是时释放通过所述 RN接 入的剩余 UE。
13、 根据权利要求 10所述的系统, 其特征在于, 所述卸载策略为: 将 处于紧急业务中的 UE进行切换, 和 /或, 将处于高于设定等级的业务中的 UE进行切换, 和 /或, 将优先级等级高于设定等级的 UE进行切换, 和 /或, 随机选择设定数量的 UE进行切换。
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| CN103974374B (zh) * | 2013-01-29 | 2018-02-23 | 中国移动通信集团公司 | 一种接入控制方法及装置 |
| WO2017001581A1 (en) | 2015-06-30 | 2017-01-05 | Nokia Solutions And Networks Oy | Proximity services priority control for multicast traffic in proximity services user equipment – network relay scenario |
| US10708812B2 (en) | 2015-07-24 | 2020-07-07 | Panasonic Intellectual Property Corporation Of America | Relay UE discovery for proximity services |
| WO2020199195A1 (zh) * | 2019-04-04 | 2020-10-08 | 华为技术有限公司 | 一种数据处理方法、中继设备和网络设备 |
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