WO2012103773A1 - Procédé de régulation de surcharge et système de système de relais - Google Patents

Procédé de régulation de surcharge et système de système de relais Download PDF

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Publication number
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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WO
WIPO (PCT)
Prior art keywords
message
denb
offload
handover
release
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Application number
PCT/CN2011/084669
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English (en)
Chinese (zh)
Inventor
梁爽
游世林
卢飞
Original Assignee
中兴通讯股份有限公司
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Publication of WO2012103773A1 publication Critical patent/WO2012103773A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de régulation de surcharge d'un système de relais comprenant : à réception d'un message de décharge RN ou de début de surcharge envoyé par un côté de réseau, une décharge du DeNB, en fonction d'une politique de décharge configurée dans le DeNB, un équipement utilisateur (UE) accédant à un RN. L'invention concerne aussi un système de régulation de surcharge d'un système de relais servant à mettre en œuvre le procédé, comprenant un RN, un DeNB et un UE. Le DeNB est utilisé, à réception d'un message de décharge RN ou de début de surcharge envoyé par un côté de réseau, pour décharger, en fonction d'une politique de décharge configurée dans le DeNB, l'UE accédant au RN. La présente invention assure que les services d'UE à haute priorité de service ou haute priorité d'utilisateur ne sont pas interrompus, et assure au maximum la continuité de service des UE accédant via le RN. La présente invention peut être mise en œuvre sans faire de grands changements dans un système de communication existant, et assure la facilité de l'implémentation des solutions techniques.
PCT/CN2011/084669 2011-01-31 2011-12-26 Procédé de régulation de surcharge et système de système de relais WO2012103773A1 (fr)

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CN201110034001.4 2011-01-31
CN201110034001.4A CN102625366B (zh) 2011-01-31 2011-01-31 中继系统的过载控制方法及系统

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JP6594460B2 (ja) * 2015-07-24 2019-10-23 パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ 近接サービスのための改善されたリレーｕｅディスカバリ
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