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WO2010121438A1 - 小区重选的方法、系统及用户设备 - Google Patents

小区重选的方法、系统及用户设备 Download PDF

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Publication number
WO2010121438A1
WO2010121438A1 PCT/CN2009/071464 CN2009071464W WO2010121438A1 WO 2010121438 A1 WO2010121438 A1 WO 2010121438A1 CN 2009071464 W CN2009071464 W CN 2009071464W WO 2010121438 A1 WO2010121438 A1 WO 2010121438A1
Authority
WO
WIPO (PCT)
Prior art keywords
user equipment
cell
cell reselection
information
priority
Prior art date
Application number
PCT/CN2009/071464
Other languages
English (en)
French (fr)
Inventor
黄英
牛卫国
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2009/071464 priority Critical patent/WO2010121438A1/zh
Priority to CN2009800001478A priority patent/CN101971524A/zh
Publication of WO2010121438A1 publication Critical patent/WO2010121438A1/zh

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/22Performing reselection for specific purposes for handling the traffic
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a method, system, and user equipment for cell reselection.
  • the different system cell or the inter-frequency cell may cover the network.
  • FIG. 1 a schematic diagram of the same coverage network in the prior art, such as UMTS (Universal Mobile Telecommunications System) cell A and LTE (Long Term Evolution) cell A, covers a common area. .
  • UMTS Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • the system sends a public priority through a system broadcast message, or uses a radio resource control release message when the UE is in an active state ( For example, the Radio Resource Control (RRC) Release message delivers a dedicated priority, and the UE transits to the idle state after receiving the RRC release message.
  • RRC Radio Resource Control
  • the prior art UE cannot use two priorities at the same time, and if a dedicated priority is received, the public priority is ignored. However, this dedicated priority is limited.
  • the PLMN Public Land Mobile Network
  • the UE For the UE in the active state, since there is no dedicated priority, when the RLF fault occurs, the UE performs cell reselection according to the radio signal and the common priority, and as a result, many UEs may simultaneously select a new cell. This will bring a load impact to the new community. For the UE in the idle state, many of the public priorities have no dedicated priority, so that the UE will also select the same new cell with a high probability when re-entering the network, which will bring a load impact to the new cell. Summary of the invention
  • An embodiment of the present invention provides a cell reselection method, where the method includes: acquiring, by a user equipment in an activated state, a cell reselection priority information of the user equipment and saving the cell; At the time, cell reselection is performed according to the cell priority reselection priority information.
  • an embodiment of the present invention provides a user equipment, where the user equipment includes: an information acquiring unit, configured to acquire, when the user equipment is in an active state, the cell reselection priority information of the user equipment, and save the information;
  • the cell reselection unit is configured to perform cell reselection according to the cell reselection dedicated priority information when a cell failure occurs in the cell accessed by the user equipment.
  • an embodiment of the present invention further provides a cell reselection system, where the cell reselection system includes at least an access network device and a user equipment as described above.
  • the user equipment in the activated state acquires the cell reselection priority information of the user equipment and saves; when the cell accessed by the user equipment fails, the cell priority is reselected according to the cell.
  • the information is used for cell reselection.
  • FIG. 1 is a schematic diagram of a same covering network in the prior art
  • FIG. 2 is a flowchart of a method for cell reselection according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a user equipment according to an embodiment of the present disclosure.
  • FIG. 4 is a flowchart of another method for cell reselection according to an embodiment of the present invention
  • 5 is a schematic diagram of a mapping relationship between an application instance index value and a cell reselection priority priority according to the present invention
  • FIG. 6 is a flowchart of still another method for cell reselection according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of still another method for cell reselection according to an embodiment of the present invention.
  • FIG. 2 it is a flowchart of a method for cell reselection according to an embodiment of the present invention, where the method includes:
  • Step 201 The user equipment in the activated state acquires the cell reselection priority information of the user equipment and saves the information.
  • Step 202 When a cell fault occurs in the cell accessed by the user equipment, perform cell reselection according to the specific priority information of the cell reselection.
  • the foregoing method embodiment of the present invention acquires the cell reselection priority information of the user equipment by using the user equipment in the activated state, and saves; when the cell accessed by the user equipment is faulty, the cell is reselected according to the cell priority reselection priority information. Reselection, when the cell accessed by the user equipment in the activated state suddenly has a cell failure, the user equipment is selected to a different new cell, thereby avoiding a load impact on the same new cell.
  • FIG. 3 is a schematic structural diagram of a user equipment according to an embodiment of the present invention, where the user equipment can implement the cell reselection method provided by the foregoing embodiment.
  • User equipment 30 includes:
  • the information obtaining unit 301 is configured to acquire the cell reselection priority information of the user equipment and save the user equipment 30 when the user equipment 30 is in an active state, and the cell reselection unit 302 is configured to be accessed by the user equipment in the activated state.
  • cell reselection is performed according to the cell priority reselection priority information.
  • the foregoing information acquiring unit 301 may further be used by the user equipment 30 in the activated state to receive the cell reselection dedicated priority information by using the system broadcast, or further used to receive the cell weight received by the system broadcast when the user equipment is in an idle state.
  • the cell reselection priority information includes a mapping relationship between the index value and the cell reselection priority.
  • the cell reselection unit 302 calculates an index value of the user equipment according to the international mobile subscriber identity of the user equipment, and selects the index.
  • the cell corresponding to the value reselects the dedicated priority information, and performs cell reselection according to the cell priority reselection priority information.
  • the information acquiring unit 301 may be further configured to: when the user equipment is in an active state, receive a cell reselection priority of the user equipment by using a radio resource control message.
  • the information acquiring unit 301 may be further configured to reserve the cell reselection priority information delivered by the RRC release message when the user equipment enters the activation state.
  • the information acquiring unit 301 may be configured to: receive, by using the handover message, the cell reselection priority information that is sent by the source cell, the target cell access information that the user equipment is to access, and the resource reservation situation;
  • the reselection unit 302 performs cell reselection according to the cell priority reselection priority information and the target cell access information and resource reservation conditions to be accessed by the user equipment.
  • the embodiment of the present invention further provides a cell reselection system, where the cell reselection system includes at least an access network device and the foregoing user equipment.
  • the access network device is an eNB.
  • the access network device is an RNC (Radio Network Controller).
  • the access network device may be configured to determine, according to the adjacency relationship priority, and/or the priority of the user equipment, and/or whether the same coverage is prioritized, the user equipment that needs to send the cell reselection priority priority.
  • the access network device may be further configured to use, according to the service distribution information of the user equipment, the load information of the user equipment cell, the user information of different types of the user equipment, the service information of the user equipment, the user equipment network support capability information, and the foregoing User equipment
  • One or more of the distribution information in different networks obtains the cell reselection-specific priority information.
  • the user equipment in the activated state can select different new cells when the connected cell suddenly experiences a cell failure, thereby avoiding a load impact on the same new cell.
  • FIG. 4 it is an embodiment of a method for reselecting another cell according to an embodiment of the present invention.
  • This embodiment can be implemented by the above user equipment and system.
  • the user equipment acquires the cell reselection dedicated priority information through the system broadcast, and thereby obtains its own cell reselection dedicated priority information.
  • the LTE system is used as an example, and the user equipment obtains the cell reselection priority information that is sent by the eNB (evolved NodeB, evolved base station) through the system broadcast.
  • eNB evolved NodeB, evolved base station
  • Step 401 The active user equipment receives the cell reselection priority information delivered by the evolved base station through the system broadcast.
  • the cell reselection dedicated priority information is a correspondence between an index value and a cell reselection dedicated priority.
  • the index value corresponds to a cell reselection priority relationship of different cells, for example, a mapping relationship between the index value and the cell reselection priority priority shown in FIG. 5.
  • Step 402 The user equipment obtains its own cell reselection priority by using the index value and the cell reselection priority priority according to its own index value.
  • the user equipment may calculate its own index value according to an algorithm specified by the system.
  • the UE may calculate the index value according to an IMSI (International Mobile Subscriber Identity) mod, and the remainder is Index value.
  • IMSI International Mobile Subscriber Identity
  • the system may set an algorithm for calculating an index value according to the situation.
  • Step 403. When a cell failure occurs in the cell accessed by the user equipment, the user equipment performs cell reselection according to the cell reselection priority of the user equipment obtained in the foregoing step 402.
  • UE1 calculates that its own index value is 1, when UE1 generates a cell.
  • the preferred cell is the cell of the LTE frequency point fl of the system.
  • UE2 calculates that its own index value is 2.
  • the preferred cell is a UMTS cell.
  • the embodiment of the present invention further provides another method for cell reselection.
  • the method for the user equipment in the activated state to obtain the cell reselection priority is: retaining the cell of the user equipment that is received by the user equipment through the system broadcast in the idle state.
  • Re-select dedicated priority information that is, when the user equipment enters the active state from the idle state, the cell reselection priority information of the user equipment that is received by the user equipment through the system broadcast in the idle state is not deleted.
  • the cell reselection dedicated priority information is a correspondence between an index value and a cell reselection dedicated priority.
  • the method for obtaining the cell reselection priority of the user equipment by using the index value and performing cell reselection is the same as the method and the example in steps 402 and 403, and details are not described herein again.
  • the new cell reselection dedicated priority is used to update instead of the old cell reselection priority.
  • the embodiment of the present invention solves the problem that when a cell in an active state suddenly experiences a cell failure, a large number of UEs in the faulty cell simultaneously select the same new cell to bring a load impact to the new cell, and the cell broadcast by the system is dedicated. Reselecting the priority information enables the UE to effectively and reasonably distribute to different new cells to ensure the success rate of subsequent access.
  • FIG. 6 is a schematic diagram of another method for cell reselection according to an embodiment of the present invention.
  • This embodiment can be implemented by the above user equipment and system.
  • the user equipment in the active state receives the cell reselection priority information through the radio resource control message.
  • the LTE system is used as an example.
  • the user equipment in the active state receives the cell reselection priority information delivered by the eNB through the RRC message, that is, the eNB notifies the UE of the cell reselection priority.
  • the eNB informs the UE of the cell reselection dedicated priority through an RRC reconfiguration message or other RRC message.
  • the method for cell reselection provided in this embodiment includes: Step 601.
  • the UE in the active state receives the cell reselection priority of the UE delivered by the eNB through the RRC message and saves it.
  • the foregoing radio resource control message may include: A resource control reconfiguration message, or a radio resource control release message, or a radio bearer setup message, or a radio resource control dedicated message or other RRC message.
  • Step 602. When the cell has the cell failure, the UE performs cell reselection according to the cell reselection priority of the UE.
  • the RNC corresponds to the foregoing eNB
  • the IU port corresponds to the S1 port
  • the message of the IU port may have a RAB ASSIGNMENT REQUEST
  • other RRC messages may include a radio bearer setup message (for example, a Radio Bearer). Setup message), or RRC dedicated message or other newly constructed RRC message that can achieve the same function.
  • the eNB obtains an initial context request setup message (for example, an intial context request setup message) sent by the MME (Mobility Management Entity) to obtain the UE.
  • an initial context request setup message for example, an intial context request setup message
  • MME Mobility Management Entity
  • the eNB obtains the information, the neighboring cell characteristics are comprehensively considered, and the cell reselection priority of the UE is obtained, and then sent to the UE by using a radio resource control message.
  • the eNB may further determine, according to the adjacency relationship priority, the priority of the UE, and whether the same coverage is prioritized, which UEs need to send the cell reselection priority of the UE; or each time the handover is performed. At the time, it is sent to the UE along with the handover command.
  • the method for determining whether the same coverage is performed includes: determining, according to a proportional relationship between a user equipment that can measure the second cell in the first cell and a user equipment that can measure the first cell in the second cell, determining the first cell And a coverage relationship of the second cell.
  • the radio resource management algorithm it is determined whether the neighboring cell is covered, and whether the coverage is the same according to the proportional relationship of the coverage area. For example: 1) The source cell triggers all UEs in the cell to measure the neighboring cell. If all the UEs can detect a neighboring cell multiple times, it is determined that the neighboring cell is within the coverage of the cell. 2) If the neighboring cell performs the above 1) measurement on the local cell, the result is that all the UEs can detect the local cell multiple times, and 1) can determine that the two cells are the same coverage; if the neighboring cell measures only the local cell, If the UE can detect the coverage, the local cell and the neighboring cell are the size coverage.
  • the neighboring cell can measure that the UE ratio of the cell is not much different, the ratio of the coverage area of the two cells can be determined. relationship. 3) If only some UEs in the source cell detect the neighboring cell, and only some UEs in the neighboring cell can detect the cell, the two cells are partially overlapped; if the result of multiple measurements is detected, the UE in the neighboring cell is detected. If the ratios of the two cells are not much different, the ratio of the overlapping regions of the two cells to the neighboring cells may be determined; further, the proportional relationship between the coverage areas of the two cells may be determined.
  • the network can also randomly select a part of the UE to perform the above measurements 1 to 3, and measure multiple times (more than the above method), and similar results can be determined similarly to the above 1) to 3).
  • the embodiments of the present invention are not limited thereto.
  • the embodiment of the present invention solves the problem that when a cell in activating state suddenly experiences a cell failure, a large number of UEs in the faulty cell simultaneously select the same new cell, causing a load impact on the new cell, when the user equipment is in an active state,
  • the radio resource control message is used to receive the cell reselection priority information that is sent by the eNodeB, so that the UE can be effectively and appropriately distributed to different new cells to ensure the success rate of subsequent access.
  • the embodiment of the invention further provides an embodiment of a method for cell reselection.
  • This embodiment can be implemented by the above user equipment and system.
  • the cell reselection method provided in this embodiment keeps the cell reselection priority of the UE in the idle state when the UE enters the active state, that is, saves in the active state and continues to use the cell reselection priority of the UE. And when the RLF occurs in the UE, cell reselection is performed according to the cell reselection dedicated priority.
  • the cell reselection priority priority of the UE that is sent by the UE in the idle state is the cell reselection priority of the UE that is sent when the RRC release is released. That is, in this embodiment, the method for the UE to obtain the cell reselection priority priority when the UE enters the active state is to reserve the cell reselection priority information delivered by the RRC release message.
  • the embodiment of the present invention solves the problem that when a UE suddenly occurs RLF, a large number of UEs in the faulty cell simultaneously select the same new cell to bring a load impact to the new cell, and use the radio resource control release message to deliver the cell weight. Selecting a dedicated priority enables the UE to effectively and reasonably spread to different The new cell guarantees the success rate of subsequent access.
  • the service distribution strategy for example: prioritize different services in different systems to generate service priorities of different cells.
  • the cell reselection priority of the system is set to the lowest.
  • the UEs are distributed in different networks according to a certain proportion, and the proportional relationship may be determined according to an operator's policy or according to the capacity of the network. For example, if the operator wants LTE, UMTS, and GSM to bear 20%, 40%, and 40% of the load, then the ratio is 2: 4: 4.
  • the cell reselection priority of the embodiment of the present invention may be calculated according to one or more of the foregoing methods 1) to 6), but the embodiment of the present invention is not limited thereto.
  • FIG. 7 an embodiment of a method for reselecting another cell according to an embodiment of the present invention is shown.
  • This embodiment can be implemented by the above user equipment and system.
  • the user equipment is to perform handover, if the source cell sends a handover request to multiple target cells, after receiving the target cell handover response, the source cell is based on the source cell.
  • the previous handover statistical success rate or radio resource management algorithm sets a cell reselection priority for each target cell.
  • the method specifically includes:
  • Step 701 The user equipment receives, by using a handover message, a cell reselection priority priority corresponding to a plurality of target cells delivered by the source cell, and access information and a resource reservation situation of the target cell. Specifically, the user equipment may be notified by the handover message of a plurality of different priority switching containers, where the container includes the access information of the target cell and the resource reservation, and the user equipment saves after receiving the information;
  • Step 702 The user equipment reselects the dedicated priority information according to the foregoing cell, and performs cell reselection according to the access information of the target cell to be accessed by the user equipment and the resource reservation situation.
  • the embodiment of the present invention solves the problem that a large number of UEs simultaneously select the same new cell and bring a load impact to the new cell, and the UE is effectively and reasonably dispersed to different new ones by using the cell reselection dedicated priority sent by the source cell.
  • the cell guarantees the success rate of subsequent access.
  • the storage medium includes all or part of the above steps, such as a ROM/RAM, a magnetic disk, an optical disk, and the like.

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

Description

小区重选的方法、 系统及用户设备
技术领域
本发明涉及移动通信领域, 尤其涉及小区重选的方法、 系统及用户设 备。
背景技术
在移动通信系统中, 为了业务的连续性或者解决覆盖问题, 一般情况下 异系统小区或者异频小区可以同覆盖布网。 如图 1所示, 为现有技术一种同 覆盖布网示意图, 如 UMTS (Universal Mobile Telecommunications System, 通用移动通信系统) 小区 A和 LTE (Long Term Evolution, 长期演进) 小区 A共同覆盖了一块区域。 在移动网络运行期间, 如果突然发生小区故障, 这 时小区不能正常工作, 对 UE (User Equipment, 用户设备) 来说, 会检测 到 RLF (Radio Link Failure, 无线链路失败) , UE会重选到一个新小区 的, 然后发起无线链路的连接过程。
在实现本发明过程中, 发明人发现现有技术中至少存在如下问题: 现有 技术中, 系统通过系统广播消息下发公共优先级, 或者在 UE处于激活状态 时, 用无线资源控制释放消息 (例如 Radio Resource Control ( RRC ) Release消息) 下发专用优先级, UE收到无线资源控制释放消息后即转入 idle (空闲) 状态。 现有技术 UE不能同时使用两种优先级, 如果收到专用 优先级, 那么就会忽略公共优先级。 但是这个专用优先级是有限制的, 当 UE进入 active (激活) 状态, 或者定时器超时, 或者 PLMN (Public Land Mobile Network, 公众陆地移动电话网) 改变, 现有技术都会删掉专用优先 级。 对于 active状态的 UE, 由于没有专用优先级, 那么出现上述 RLF故障 时, UE就会根据无线信号和公共优先级进行小区的重选, 结果就可能会有 很多 UE同时选择到一个新的小区上, 这样会给新小区带来负荷冲击。 对于 idle状态的 UE, 很多都是只有公共优先级没有专用优先级的, 这样 UE在 重新入网时也会大概率的选择同样一个新小区, 给新小区带来负荷冲击。 发明内容
本发明实施例提供了一种小区重选的方法, 该方法包括: 激活状态下的 用户设备获取该用户设备的小区重选专用优先级信息并保存; 当用户设备所 接入的小区发生小区故障时, 根据上述小区重选专用优先级信息进行小区重 选。
另一方面, 本发明实施例提供了一种用户设备, 该用户设备包括: 信息 获取单元, 用于当用户设备处于激活状态时获取该用户设备的小区重选专用 优先级信息并进行保存; 和小区重选单元, 用于当上述用户设备所接入的小 区发生小区故障时, 根据上述小区重选专用优先级信息进行小区重选。
再一方面, 本发明实施例还提供一种小区重选系统, 该小区重选系统至 少包括接入网设备和如前所述的用户设备。
本发明实施例提供的上述技术方案, 激活状态的用户设备获取用户设备 的小区重选专用优先级信息并保存; 当用户设备所接入的小区发生小区故障 时, 根据上述小区重选专用优先级信息进行小区重选, 当该激活状态的用户 设备所接入的小区突然发生小区故障时, 用户设备分别选择到不同新小区, 避免给同一新小区带来负荷冲击。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍, 显而易见地, 下面 描述中的实施例附图仅仅是本发明的一些实施例, 对于本领域普通技术人员 来讲, 在不付出创造性劳动性的前提下, 还可以根据这些附图获得其他的附 图。
图 1为现有技术一种同覆盖布网示意图;
图 2为本发明实施例提供的一种小区重选的方法流程图;
图 3为本发明实施例提供的一种用户设备结构示意图;
图 4为本发明实施例提供的另一种小区重选的方法流程图; 图 5为本发明应用实例索引值与小区重选专用优先级对应关系列表示意 图;
图 6为本发明实施例提供的又一种小区重选的方法流程图;
图 7为本发明实施例提供的再一种小区重选的方法流程图。
具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行 描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是全部的实 施例。 基于本发明实施例, 本领域普通技术人员在没有做出创造性劳动前提 下所获得的所有其他实施例, 都属于本发明保护的范围。
如图 2所示, 为本发明实施例提供的一种小区重选的方法流程图, 所述 方法包括:
步骤 201, 激活状态的用户设备获取该用户设备的小区重选专用优先级 信息并保存。
步骤 202, 当上述用户设备所接入的小区发生小区故障时, 根据上述小 区重选专用优先级信息进行小区重选。
本发明上述方法实施例通过激活状态的用户设备获取用户设备的小区重 选专用优先级信息并保存; 当用户设备所接入的小区发生小区故障时, 根据 上述小区重选专用优先级信息进行小区重选, 当该激活状态的用户设备所接 入的小区突然发生小区故障时, 使用户设备分别选择到不同新小区, 避免给 同一新小区带来负荷冲击。
如图 3所示, 为本发明实施例提供的一种用户设备结构示意图, 该用户 设备可以实现上述实施例提供的小区重选方法。 用户设备 30包括:
信息获取单元 301, 用于当该用户设备 30处于激活状态时获取用户设 备的小区重选专用优先级信息并进行保存; 和小区重选单元 302, 用于当该 激活状态的用户设备所接入的小区发生小区故障时, 根据上述小区重选专用 优先级信息进行小区重选。 可选的, 上述信息获取单元 301 可以进一步用于激活状态的用户设备 30通过系统广播接收小区重选专用优先级信息, 或进一步用于在上述用户 设备处于空闲状态时通过系统广播接收的小区重选专用优先级信息, 并在上 述用户设备转入激活状态后保留上述小区重选专用优先级信息。 上述小区重 选专用优先级信息包括索引值与小区重选专用优先级的对应关系; 上述小区 重选单元 302按照上述用户设备的国际移动用户识别码来计算上述用户设备 的索引值, 选择上述索引值对应的小区重选专用优先级信息, 根据上述小区 重选专用优先级信息进行小区重选。
可选的, 上述信息获取单元 301, 可以进一步用于当上述用户设备在激 活状态时, 通过无线资源控制消息接收上述用户设备的小区重选专用优先 级。 上述信息获取单元 301, 可以进一步用于在上述用户设备进入激活状态 时, 保留无线资源控制释放消息下发的小区重选专用优先级信息。
可选的, 上述信息获取单元 301, 可以用于通过切换消息接收源小区下 发的小区重选专用优先级信息和上述用户设备要接入的目标小区接入信息以 及资源预留情况; 上述小区重选单元 302根据上述小区重选专用优先级信 息, 并结合上述用户设备要接入的目标小区接入信息以及资源预留情况进行 小区重选。
本发明实施例还提供一种小区重选系统, 该小区重选系统至少包括接入 网设备和上述的用户设备。 在 LTE系统中, 上述接入网设备是 eNB, 在 UMTS系统中, 上述接入网设备是 RNC (Radio Network Controller, 无线网 络控制器) 。
可选的, 上述接入网设备可以用于根据邻接关系优先级、 和 /或用户设 备的优先级、 和 /或同覆盖是否优先考虑, 确定需要发送上述小区重选专用 优先级的用户设备。 上述接入网设备还可用于根据上述用户设备的业务分布 信息、 上述用户设备小区的负载信息、 上述用户设备不同类别的用户信息、 上述用户设备的业务信息、 上述用户设备网络支持能力信息、 上述用户设备 在不同的网络中的分布信息中的一种或多种计算获得所述小区重选专用优先 级信息。
通过本发明上述装置和系统实施例, 可以使激活状态的用户设备在所接 入的小区突然发生小区故障时, 分别选择到不同新小区, 避免给同一新小区 带来负荷冲击。
如图 4所示, 为本发明实施例提供的另一小区重选的方法实施例。 本实 施例可通过上述用户设备和系统实现。 本实施例提供的小区重选的方法中, 用户设备通过系统广播获取小区重选专用优先级信息, 并从而获得自身的小 区重选专用优先级信息。 本实施例以 LTE系统为例, 用户设备通过系统广 播获取 eNB ( evolved NodeB , 演进基站) 下发的小区重选专用优先级信 息。 具体方法包括:
步骤 401. 激活态的用户设备通过系统广播接收演进基站下发的小区重 选专用优先级信息。 具体地, 该小区重选专用优先级信息为索引值与小区重 选专用优先级的对应关系。 其中, 一个索引值对应不同小区的小区重选专用 优先级关系, 例如, 图 5所示的索引值与小区重选专用优先级对应关系列 表。
步骤 402. 上述用户设备根据自身的索引值通过上述索引值与小区重选 专用优先级对应关系获得自身的小区重选专用优先级。 具体地, 该用户设备 可根据系统规定的算法计算自己的索引值, 例如, UE可以根据 IMSI ( International Mobile Subscriber Identity, 国际移动用户识别码) 取模 (mod) 来计算上述索引值, 余数即为索引值。 但应注意的是, 本发明实施 例并不以此为限, 在具体实现过程中系统可根据情况设定计算索引值的算 法。
步骤 403. 当上述用户设备所接入的小区发生小区故障时, 该用户设备 根据上述步骤 402获得的该用户设备的小区重选专用优先级进行小区重选。
例如, 如图 5所示, UE1计算出自己的索引值是 1, 当 UE1发生小区 该故障时, UE1进行小区重选时, 首选的小区是本系统 LTE频点 fl 的小 区。 UE2计算出自己的索引值是 2, 当 UE2发生小区该故障时, UE2进行 小区重选时, 首选的小区是 UMTS小区。
本发明实施例还提供另一种小区重选的方法, 激活状态下的用户设备获 得小区重选专用优先级的方法是: 保留该用户设备在 idle状态下通过系统广 播接收的该用户设备的小区重选专用优先级信息。 即, 用户设备在从 idle状 态进入 active状态时, 不删除该用户设备在 idle状态下通过系统广播接收的 该用户设备的小区重选专用优先级信息。 具体地, 该小区重选专用优先级信 息为索引值与小区重选专用优先级的对应关系。 用户设备通过索引值获得该 用户设备的小区重选优先级并进行小区重选的方法同步骤 402和 403中的方 法和举例, 此处不再赘述。 另外, 当 UE进入到 active状态后, 接收到新的 小区重选专用优先级, 那么用新的小区重选专用优先级进行更新代替旧的小 区重选专用优先级进行更新。
本发明实施例解决了激活状态的 UE在突然发生小区故障时, 该故障小 区下大量的 UE同时选择到同一个新小区, 给新小区带来负荷冲击的问题, 通过系统广播下发的小区专用重选优先级信息使 UE有效地合理的分散到不 同的新小区, 保证后续接入的成功率。
如图 6所示, 为本发明实施例提供的另一小区重选的方法实施例。 本实 施例可通过上述用户设备和系统实现。 本实施例提供的小区重选的方法中, active状态的用户设备通过无线资源控制消息接收小区重选专用优先级信 息。 本实施例中, 以 LTE系统为例, active状态的用户设备通过无线资源控 制消息接收 eNB下发的小区重选专用优先级信息, 即由 eNB通知该 UE的 小区重选专用优先级。 例如 eNB通过 RRC重配消息或者其他的 RRC消息 通知 UE的小区重选专用优先级。 本实施例提供的小区重选的方法包括: 步骤 601. 激活状态的 UE通过无线资源控制消息接收 eNB下发的该 UE的小区重选专用优先级并保存。 上述无线资源控制消息可以包括: 无线 资源控制重配消息、 或无线资源控制释放消息、 或无线承载建立消息、 或无 线资源控制专用消息或其他 RRC消息。
步骤 602. 当上述 UE发生小区该故障时, 该 UE根据上述 UE的小区 重选专用优先级进行小区重选。
在 UMTS系统中, RNC对应上述的 eNB, IU口对应上述 S1口, IU口 的消息可以有 RAB ASSIGNMENT REQUEST (无线接入承载分配请求) 等, 其他 RRC消息可以包括无线承载建立消息 (例如 Radio Bearer Setup消 息) 、 或无线资源控制专用消息或其他可以实现相同功能的新构建的 RRC 消息。
更具体地, 在上述步骤 601之前, 当 UE发起业务请求时, eNB根据收 到 MME (Mobility Management Entity, 移动管理实体) 发送的初始上下文 请求建立消息 (例如 intial context request setup消息) , 获得该 UE的 QCI
(业务类型) , SPID (优先级) 等信息, 或其他的 S1口消息。 当 eNB得到 这些信息后, 综合考虑邻接小区特性, 得到该 UE的小区重选专用优先级, 然后通过无线资源控制消息发送给该 UE。
可选地, 在上述步骤 601前, eNB还可以根据邻接关系优先级、 UE的 优先级、 同覆盖是否优先考虑等情况, 决定需要给哪些 UE发送 UE的小区 重选优先级; 或者每次切换的时候, 伴随着切换命令发送给 UE。 判断是否 同覆盖的方法包括: 根据第一小区中能够测量到第二小区的用户设备与所述 第二小区中能够测量到所述第一小区的用户设备的比例关系, 确定所述第一 小区和所述第二小区的覆盖关系。 本发明实施例中根据无线资源管理算法判 断相邻小区是否覆盖, 进一步根据覆盖面积的比例关系判断是否同覆盖。 例 如: 1 )源小区触发本小区内的所有 UE对邻区进行测量, 如果所有 UE都 可以多次测到某一邻区, 则判断该邻区在本小区的覆盖范围内。 2) 如果邻 区对本小区也进行上述 1 ) 的测量, 结果也是多次所有 UE可以测到本小 区, 结合 1 ) 则可判定这两个小区为同覆盖; 如果邻区对本小区的测量只有 部分 UE可以测到, 则说明本小区与邻小区为大小覆盖; 进一步, 如果邻区 多次测量可以测到本小区的 UE比例都相差不大, 则可以确定这两个小区的 覆盖面积的比例关系。 3 ) 如果源小区中只有部分 UE测到邻区, 而且邻区 也只有部分 UE可以测到本小区, 则说明此两个小区为部分重叠覆盖; 如果 多次测量的结果测到邻区的 UE的比例相差不大, 则可以确定此两个小区与 邻区重叠区域所占本小区的比例; 更进一步, 可以确定这两个小区覆盖面积 的比例关系。 另外, 网络也可以随机选择部分 UE进行如上 1 ) 至 3测量, 测量多次 (多于上面的方法) , 则同样可以确定同上述 1 ) 至 3) 类似的结 果。 但本发明实施例也并不以此为限。
本发明实施例解决了激活状态的 UE在突然发生小区故障时, 该故障小 区下大量的 UE同时选择到同一个新小区, 给新小区带来负荷冲击的问题, 当用户设备在激活状态时, 通过无线资源控制消息接收演进基站下发的小区 重选专用优先级信息, 使 UE有效地合理的分散到不同的新小区, 保证后续 接入的成功率。
本发明实施例还提供一种小区重选的方法实施例。 本实施例可通过上述 用户设备和系统实现。 本实施例提供的小区重选的方法, 在 UE进入 active 状态的时候保留该 UE在 idle状态的小区重选专用优先级, 即在 active状态 下进行保存并继续使用上述 UE的小区重选专用优先级; 并且在该 UE发生 RLF时, 根据该小区重选专用优先级进行小区重选。 上述 UE在 idle状态的 小区重选专用优先级是无线资源控制释放 (RRC release) 时下发的该 UE的 小区重选专用优先级。 也就是, 本实施例中, 进入激活状态时的 UE获得小 区重选专用优先级的方法是保留无线资源控制释放消息下发的小区重选专用 优先级信息。
本发明实施例解决了 UE在突然发生 RLF时, 该故障小区下大量的 UE 同时选择到同一个新小区, 给新小区带来负荷冲击的问题, 通过利用无线资 源控制释放消息下发的小区重选专用优先级使 UE有效地合理的分散到不同 的新小区, 保证后续接入的成功率。
另外, 本发明上述各个实施例中的技术方案可以采用如下方法计算小区 重选专用优先级:
1 ) 根据业务分布策略, 例如: 根据不同业务优先分布在不同系统中来 生成不同小区的业务优先级。
2) 根据小区的负载信息, 对初始优先级进行优化, 例如: 如果小区的 负载超过预设门限 TIRATLB-High, 则该小区为的优先级降低一个等级, 如 果该小区超过过载门限, 则为最低优先级。 如果小区的性能 (如接纳成功 率, 掉话率, 切换成功率) 低于预设门限 Tper2, 将该小区的优先级下调一 个优先级。
3 ) 对于不同类别的用户, 有不同的重选专用优先级和限制。 可以根据 用户的 SPID 中的签约信息 (例如 subscription profile) 将用户分为不同类 另 lj, 不同类别的用户有不同的小区重选专用优先级。
4) 根据 UE的业务信息, 以及不同小区对业务的支持能力, 对于不同 的 UE业务, 设定不同的小区重选专用优先级。
5) 根据 UE的网络支持能力, 如果某个 UE不支持某个系统, 则将该 系统的小区重选专用优先级设置为最低。
6) 为了避免大量的 UE业务在一个系统中导致系统的拥塞, 可以考虑 UE按照一定的比例分布在不同的网络中, 这个比例关系可以根据运营商的 策略或者按照网络的容量来确定。 比如, 运营商希望 LTE、 UMTS, GSM 分别承担 20%, 40% , 40%的负载, 则这个比例关系就为 2: 4: 4。
本发明实施例的小区重选专用优先级可以根据上述方法 1 ) 到 6) 中的 一种或多种计算而得的, 但本发明实施例并不以此为限。
如图 7所示, 为本发明实施例提供的另一小区重选的方法实施例。 本实 施例可通过上述用户设备和系统实现。 当用户设备要进行切换时, 源小区如 果给多个目标小区发出了切换请求, 收到目标小区切换应答后, 源小区根据 以前的切换统计成功率或者无线资源管理算法对每一个目标小区设定一个小 区重选专用优先级。 本实施例中, 该方法具体包括:
步骤 701, 用户设备通过切换消息接收源小区下发的多个目标小区对应 的小区重选专用优先级和目标小区的接入信息以及资源预留情况。 具体地, 可以通过切换消息通知用户设备多个不同优先级的切换容器, 容器中包含目 标小区的接入信息以及资源预留情况, 用户设备收到后进行保存;
步骤 702, 用户设备根据上述小区重选专用优先级信息, 并结合上述用 户设备要接入的目标小区的接入信息以及资源预留情况进行小区重选。
本发明实施例解决了大量的 UE同时选择到同一个新小区, 给新小区带 来负荷冲击的问题, 通过利用源小区发送的小区重选专用优先级使 UE有效 地合理的分散到不同的新小区, 保证后续接入的成功率。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤 是可以通过程序来指令相关硬件来完成, 所述的程序可以存储于一计算机可 读取存储介质中, 该程序在执行时, 包括上述全部或部分步骤, 所述的存储 介质, 如: ROM/RAM、 磁盘、 光盘等。
以上所述的具体实施方式仅为本发明的具体实施方式而已, 并不用于限 定本发明的保护范围, 凡在本发明的精神和原则之内, 所做的任何修改、 等 同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种小区重选的方法, 其特征在于, 所述方法包括:
激活状态的用户设备获取该用户设备的小区重选专用优先级信息并保 存;
当所述用户设备所接入的小区发生小区故障时, 根据所述小区重选专用 优先级信息进行小区重选。
2、 如权利要求 1所述方法, 其特征在于, 所述获取用户设备的小区重 选专用优先级信息包括:
所述激活状态的用户设备通过系统广播接收所述小区重选专用优先级信 息。
3、 如权利要求 1所述方法, 其特征在于, 所述获取该用户设备的小区 重选专用优先级信息包括:
当所述用户设备进入激活状态时, 保留所述用户设备在空闲状态通过系 统广播接收的小区重选专用优先级信息。
4、 如权利要求 2或 3所述方法, 其特征在于,
所述小区重选专用优先级信息包括: 索引值与小区重选专用优先级的对 应关系。
5、 如权利要求 4所述方法, 其特征在于, 所述根据所述小区重选专用 优先级信息进行小区重选包括:
根据所述用户设备的索引值以及所述索引值与小区重选专用优先级的对 应关系, 确定与所述用户设备的索引值对应的小区重选专用优先级, 并根据 所述与所述用户设备的索引值对应的小区重选专用优先级进行小区重选。
6、 如权利要求 5所述方法, 其特征在于, 所述用户设备的索引值是根 据所述用户设备的国际移动用户识别码计算获得。
7、 如权利要求 1所述方法, 其特征在于, 所述获取该用户设备的小区 重选专用优先级信息包括: 所述激活状态的用户设备通过无线资源控制消息 接收所述用户设备的小区重选专用优先级信息。
8、 如权利要求 7所述方法, 其特征在于, 所述无线资源控制消息包 括: 无线资源控制重配消息、 或无线资源控制释放消息、 或无线承载建立消 息、 或无线资源控制专用消息。
9、 如权利要求 7所述方法, 其特征在于, 所述方法进一步包括: 根据邻接关系优先级、 和 /或用户设备的优先级、 和 /或同覆盖是否优先 考虑, 确定需要通过无线资源控制消息发送所述用户设备的小区重选专用优 先级的用户设备。
10、 如权利要求 9所述的方法, 其特征在于, 判断所述同覆盖的方法包 括: 根据第一小区中能够测量到第二小区的用户设备与所述第二小区中能够 测量到所述第一小区的用户设备的比例关系, 确定所述第一小区和所述第二 小区的覆盖关系。
11、 如权利要求 2或 7所述方法, 其特征在于,
所述小区重选专用优先级信息是根据所述用户设备的业务分布信息、 所 述用户设备小区的负载信息、 所述用户设备不同类别的用户信息、 所述用户 设备的业务信息、 所述用户设备网络支持能力信息、 所述用户设备在不同的 网络中的分布信息中的一种或多种计算获得。
12、 如权利要求 1所述方法, 其特征在于, 所述获取该用户设备的小区 重选专用优先级信息包括:
在所述用户设备进入激活状态时, 保留无线资源控制释放消息下发的小 区重选专用优先级信息。
13、 如权利要求 1所述方法, 其特征在于, 所述获取用户设备的小区重 选专用优先级信息包括:
通过切换消息接收源小区下发的小区重选专用优先级信息和所述用户设 备要接入的目标小区接入信息以及资源预留情况;
根据所述小区重选专用优先级信息和所述用户设备要接入的目标小区接 入信息以及资源预留情况进行小区重选。
14、 一种用户设备, 其特征在于, 所述用户设备包括:
信息获取单元, 用于当所述用户设备在激活状态时获取用户设备的小区 重选专用优先级信息并进行保存; 和
小区重选单元, 用于当所述用户设备所接入的小区发生小区故障时, 根 据所述小区重选专用优先级信息进行小区重选。
15、 如权利要求 14所述用户设备, 其特征在于,
所述信息获取单元进一步用于, 通过系统广播接收小区重选专用优先级 信息。
16、 如权利要求 15所述用户设备, 其特征在于,
所述信息获取单元, 进一步用于通过系统广播接收的索引值与小区重选 专用优先级的对应关系。
17、 如权利要求 16所述用户设备, 其特征在于,
所述小区重选单元, 进一步用于按照所述用户设备的国际移动用户识别 码来计算所述用户设备的索引值, 选择所述索引值对应的小区重选专用优先 级信息, 根据所述小区重选专用优先级信息进行小区重选。
18、 如权利要求 14所述用户设备, 其特征在于,
所述信息获取单元, 进一步用于当所述用户设备进入激活状态时, 保留 所述用户设备在空闲状态通过系统广播接收的小区重选专用优先级信息。
19、 如权利要求 14所述用户设备, 其特征在于,
所述信息获取单元, 进一步用于当所述用户设备在激活状态时, 通过无 线资源控制消息接收所述用户设备的小区重选专用优先级。
20、 如权利要求 14所述用户设备, 其特征在于,
所述信息获取单元, 进一步用于在所述用户设备进入激活状态时, 保留 无线资源控制释放消息下发的小区重选专用优先级信息。
21、 如权利要求 14所述用户设备, 其特征在于, 所述信息获取单元, 进一步用于通过切换消息接收源小区下发的小区重 选专用优先级信息和所述用户设备要接入的目标小区接入信息以及资源预留 情况;
所述小区重选单元, 进一步用于根据所述小区重选专用优先级信息和所 述用户设备要接入的目标小区接入信息以及资源预留情况进行小区重选。
22、 一种小区重选系统, 其特征在于, 所述小区重选系统至少包括接入 网设备和如权利要求 14-21所述的用户设备。
23、 如权利要求 22所述的小区重选系统, 其特征在于,
所述接入网设备, 用于根据邻接关系优先级、 和 /或用户设备的优先 级、 和 /或同覆盖是否优先考虑, 确定需要通过无线资源控制消息发送所述 用户设备的小区重选专用优先级的用户设备。
24、 如权利要求 22所述的小区重选系统, 其特征在于,
所述接入网设备, 用于根据所述用户设备的业务分布信息、 所述用户设 备小区的负载信息、 所述用户设备不同类别的用户信息、 所述用户设备的业 务信息、 所述用户设备网络支持能力信息、 所述用户设备在不同的网络中的 分布信息中的一种或多种计算获得所述小区重选专用优先级信息。
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