WO2021196897A1 - 非激活状态终端的小区重选方法、基站和计算机可读介质 - Google Patents

非激活状态终端的小区重选方法、基站和计算机可读介质 Download PDF

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Publication number
WO2021196897A1
WO2021196897A1 PCT/CN2021/075905 CN2021075905W WO2021196897A1 WO 2021196897 A1 WO2021196897 A1 WO 2021196897A1 CN 2021075905 W CN2021075905 W CN 2021075905W WO 2021196897 A1 WO2021196897 A1 WO 2021196897A1
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WIPO (PCT)
Prior art keywords
cell
base station
reselection
target
serving base
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PCT/CN2021/075905
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English (en)
French (fr)
Inventor
曹怡晋
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中兴通讯股份有限公司
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Priority to EP21781737.8A priority Critical patent/EP4132096A4/en
Publication of WO2021196897A1 publication Critical patent/WO2021196897A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • 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
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information

Definitions

  • the present disclosure relates to the field of communication technology, for example, to a cell reselection method of a terminal in an inactive state, a base station, and a computer-readable medium.
  • the state of the terminal equipment introduces an inactive (Inactive) state.
  • the UE When the UE moves to another base station in the Inactive state, The UE will perform cell reselection access under the target base station.
  • the target base station After the UE determines the target base station, the target base station needs to obtain it from the last serving base station that previously served the UE through the interconnection interface.
  • the context information of the UE, and the last serving base station will back-transmit the data received from the core network to the target base station.
  • the present disclosure provides a cell reselection method for a terminal in an inactive state, a base station, and a computer-readable medium.
  • a method for cell reselection of a terminal in an inactive state includes:
  • a base station including:
  • One or more processors a storage device with one or more programs stored thereon, and when the one or more programs are executed by the one or more processors, the one or more processors realize the Disclose the provided cell reselection method for inactive state terminals.
  • a computer-readable medium is also provided, on which a computer program is stored, where the program is executed by a processor to implement the cell reselection method for an inactive state terminal provided in the present disclosure.
  • FIG. 1 is a flowchart of a cell reselection method for a terminal in an inactive state according to an embodiment of the disclosure
  • Fig. 2 is a flowchart of another method for cell reselection of a terminal in an inactive state according to an embodiment of the present disclosure
  • FIG. 3 is a flowchart of another cell reselection method for a terminal in an inactive state according to an embodiment of the disclosure
  • FIG. 4 is a flowchart of still another cell reselection method for a terminal in an inactive state according to an embodiment of the disclosure
  • FIG. 5 is a flowchart of still another method for cell reselection of a terminal in an inactive state according to an embodiment of the disclosure
  • FIG. 6 is a schematic structural diagram of a base station provided by an embodiment of the disclosure.
  • the networking of the 5G system is divided into a central unit (CU) and a distributed unit (DU).
  • the UE connected to the 5G system has three states: connected, idle, and inactive. State, where the connect state is the state in which the UE is active on both the CU and DU sides, the idle state refers to the state where the UE context is released, and the inactive state is an intermediate state between idle and connect, that is, the CU side retains UE context information, only DU The state of side release. Compared with entering the connect state from the idle state, the UE enters the connect state from the inactive state, which saves the time of establishing the UE context. When the UE does not send or receive data for a long time, it enters the inactive state from the connect state.
  • the UE In the inactive state, when the UE moves and moves to another base station, the UE needs to determine a new target base station for cell reselection access .
  • the target base station After the UE determines the target base station, during the process of the UE accessing the target base station, the target base station obtains the context information of the UE from the original serving base station of the UE to complete the access process.
  • the original serving base station When the base stations cannot directly interact with each other, the original serving base station often retains the context information of the UE for a long time, and the time delay for the UE to access the target base station is too long.
  • the cell reselection method of the inactive state terminal provided in the present disclosure is used to solve the above technical problem.
  • FIG. 1 is a flowchart of a method for cell reselection of an inactive terminal according to an embodiment of the disclosure.
  • the current serving base station to which the target terminal belongs is used as the executive body.
  • the method includes :
  • Step S101 Obtain a list of reselected cells sent by the target terminal.
  • Step S102 Determine a reselection result according to the cell information recorded in the reselection cell list, and feed back the reselection result to the target terminal.
  • the cell reselection mechanism When the target terminal moves to the edge of the current serving base station in the inactive state, the cell reselection mechanism will be triggered.
  • the target terminal will obtain a list of reselected cells suitable for reselection access at the current location.
  • the list of reselected cells contains There are cell identifiers of cells that can be reselected, and the number of reselected cell lists can be one or multiple.
  • the target terminal after obtaining the reselection cell list, the target terminal sends the reselection cell list to the current serving base station.
  • the serving base station determines according to the cell information recorded in the reselection cell list.
  • the reselection result is fed back to the target terminal, so that the current serving base station can process the context information of the target terminal in time according to the reselection result (releasing the context information or transmitting the context information and releasing the context information).
  • the reselection result includes the determined target cell or the target cell cannot be determined.
  • the current serving base station refers to the home base station of the cell where the target terminal is located when it enters the inactive state from the connect state.
  • the cell reselection method of the inactive state terminal obtains the reselection cell list of the target terminal by the current serving base station of the target terminal, and determines the reselection result according to the cell information recorded in the cell reselection list, and The reselection result is fed back to the target terminal, so that the current serving base station of the target terminal can determine the reselection result during the cell reselection process of the target terminal, so that the current serving base station can be used during the cell reselection process of the target terminal.
  • the context of the target terminal is processed.
  • the current serving base station can process the context information of the target terminal in advance, on the one hand, the delay of the terminal's subsequent access to the target cell is reduced, and on the other hand, the current serving base station can Accurately determine when the context information of the target terminal needs to be released, thereby avoiding the problem of waste of storage resources caused by the current serving base station storing the context information of the target terminal for a long time.
  • Fig. 2 is another cell reselection method for a terminal in an inactive state according to an embodiment of the present disclosure. As shown in Fig. 2, in some embodiments, the method includes the above steps S101 and S102, wherein, step S102 includes:
  • Step S1021a In response to the presence of a cell belonging to the serving base station in the reselection cell list, select the cell with the strongest signal strength from the cells belonging to the serving base station recorded in the reselection cell list as the target cell, and set the target The cell is sent to the target terminal as the reselection result.
  • the reselection cell list includes the cell belonging to the current serving base station, it means that the current location of the target terminal is still in the current position.
  • the coverage area of the serving base station when the current serving base station of the target terminal determines the reselection result, when the reselection cell list includes the cell belonging to the current serving base station, it means that the current location of the target terminal is still in the current position. The coverage area of the serving base station.
  • the target terminal carries the target cell after receiving the feedback of the current serving base station When the feedback message is received, it is directly connected to the target cell. For example, when the target cell is determined from the cells belonging to the serving base station recorded in the reselected cell list, the cell with the strongest signal strength can be selected from the cells belonging to the serving base station recorded in the reselected cell list As the target cell.
  • the target cell can also be determined based on other methods.
  • a cell can be randomly selected as the target cell from the cells belonging to the serving base station recorded in the reselection cell list; in other implementations
  • the first cell among the cells belonging to the serving base station recorded in the reselection cell list may also be used as the target cell.
  • the present disclosure does not limit the method for determining the target cell, as long as the target cell can be selected from the cells belonging to the serving base station recorded in the reselection cell list.
  • Fig. 3 is another cell reselection method for a terminal in an inactive state according to an embodiment of the disclosure. As shown in Fig. 3, in some embodiments, the method includes the above-mentioned steps S101 and S102, wherein, step S102 includes:
  • Step S1021b in response to the reselection cell list that does not have a cell belonging to the serving base station but a cell belonging to the serving base station's interconnected base station, select the interconnected base station belonging to the serving base station recorded in the reselected cell list The cell with the strongest signal strength is selected as the target cell among the cells, and the target cell is sent to the target terminal as the reselection result.
  • an interconnected base station refers to a base station that interacts with the serving base station through an interconnection interface.
  • the current serving base station of the target terminal determines the reselection result
  • the current serving base station determines the target cell as the reselection result from the cells belonging to the interconnected base station of the serving base station recorded in the list of reselected cells
  • the interconnected base station of the current serving base station can directly communicate with the current serving base station. Information exchange. Therefore, selecting the cell under the interconnected base station as the target cell for access can enable the context information of the target terminal stored on the current serving base station to be directly transferred to the target base station without the need to use the core network for transfer.
  • the rapid transfer of the context information of the target terminal reduces the time delay of the target terminal's subsequent access to the target cell; at the same time, the current serving base station of the target terminal also determines that the context information of the target terminal stored by itself needs to be released, so that the target terminal's context information needs to be released. After the context information of the target terminal is transmitted to the target base station, the context information is released in time to avoid long-term occupation of its own storage resources.
  • the target cell when the target cell is determined from the interconnected base station belonging to the serving base station recorded in the reselected cell list, the target cell may be determined from the interconnected base station belonging to the serving base station recorded in the reselected cell list. Among the cells, the cell with the strongest signal strength is selected as the target cell. The present disclosure may also determine the target cell based on other methods. In some embodiments, a cell may be randomly selected as the target cell from the cells of the interconnected base station belonging to the serving base station recorded in the reselection cell list; In some embodiments, the first cell among the cells belonging to the interconnected base station of the serving base station recorded in the list of reselected cells may also be used as the target cell. The present disclosure does not limit the method for determining the target cell, as long as the target cell can be selected from the cells of the interconnected base station belonging to the serving base station recorded in the reselection cell list.
  • the method further includes:
  • Step S1022b Send the context information of the target terminal to the target base station to which the target cell belongs, and release the context information of the target terminal recorded in the serving base station.
  • the current serving base station of the target terminal After the current serving base station of the target terminal selects the cell under the base station interconnected with the serving base station as the reselection result, it sends the context information of the target terminal stored in itself to the target base station, so that the target terminal can access the target cell before the target terminal accesses the target cell.
  • the context information of the target terminal is delivered in advance, and then the context information of the target terminal is released, and its own storage resources are released in time.
  • step S1022b sending the context information of the target terminal to the target base station to which the target cell belongs can be implemented by means of an interconnection interface between the target base station and the current serving base station.
  • the interconnection interface between the target base station and the current serving base station is an Xn interface.
  • Fig. 4 is another cell reselection method for a terminal in an inactive state according to an embodiment of the present disclosure. As shown in Fig. 4, in some embodiments, the method includes the above-mentioned steps S101 and S102, wherein, step S102 includes:
  • Step S1021c In response to the absence of a cell belonging to the serving base station and a cell belonging to the interconnected base station of the serving base station in the reselection cell list, the idle state handover instruction is sent to the target terminal as the reselection result.
  • the current serving base station in the process of determining the reselection result by the current serving base station of the target terminal, when all the cells included in the reselection cell list are neither attributable to the current serving base station, nor attributable to the current serving base station.
  • the interconnected base station it means that the target terminal will have a lower access success rate if it continues the cell reselection process.
  • the current serving base station notifies the target terminal to enter the idle state, so that the target terminal will enter the idle state. After the idle state, re-enter the cell reselection access mechanism, thereby improving the access success rate to a certain extent.
  • the method further includes:
  • Step S1022c Release the context information of the target terminal.
  • the current serving base station In the case that there is no cell belonging to the current serving base station and a cell belonging to the interconnected base station of the current serving base station in the reselection cell list, the current serving base station actively releases the context information of the target terminal, thereby making the storage resources of the current serving base station available It can be released in time, thereby avoiding the storage resources of the current serving base station from being occupied for a long time, and avoiding resource waste.
  • Fig. 5 is another method for cell reselection of a terminal in an inactive state provided by the implementation of the present disclosure. As shown in Fig. 5, in some embodiments, the method includes the above-mentioned steps S101 and S102, wherein, step S102 includes:
  • Step S10200 Determine whether there is a cell belonging to the serving base station in the reselected cell list.
  • step S10200 when it is determined that there is a cell belonging to the serving base station in the reselected cell list, perform the above step S1021a; when it is determined that there is no cell belonging to the serving base station in the reselected cell list, perform step S10201 .
  • Step S10201 Determine whether there is a cell belonging to the interconnected base station of the serving base station in the list of reselected cells.
  • step S10201 when it is determined that there is a cell belonging to the interconnected base station of the serving base station in the reselected cell list, the above step S1021b is executed; when it is determined that there is no interconnected cell belonging to the serving base station in the reselected cell list For the cell of the base station, the above step S1021c is executed.
  • the current serving base station after obtaining the reselection cell list sent by the target terminal, performs identification and judgment on the cells in the reselection cell list.
  • the list of reselected cells records the identities of multiple reselectable cells.
  • the identity of the cell can identify which base station the cell belongs to.
  • the current serving base station stores a list of interconnected base stations that have an interconnection relationship with itself. Therefore, the current serving base station can determine which cells in the reselected cell list belong to itself and which cells belong to the interconnected base station according to the cell identity and its stored list of interconnected base stations.
  • the following describes the cell reselection method of the inactive state terminal provided by the present disclosure in a specific scenario.
  • the UE accesses to the cell cell11 (cell11 belongs to the next generation NodeB (gNB) 1), and then enters the inactive state.
  • cell11 belongs to the next generation NodeB (gNB) 1), and then enters the inactive state.
  • gNB next generation NodeB
  • the UE moves to the edge of cell11, so it needs to be reselected. After triggering the reselection mechanism, the reselected cells that meet the reselection conditions are cell21, cell12, and cell13. The UE lists the cells cell21, cell12, and cell13. Sent to gNB1.
  • gNB1 After receiving the reselection target cell list, gNB1 selects cell12 (cell12 and cell11 belong to the base station gNB1) as the target cell and sends it to the UE.
  • the UE After the UE receives the cell12 identifier sent by gNB1, it reselects to the cell12 cell.
  • the UE accesses to the cell cell11 (cell11 belongs to the base station gNB1), and then enters the inactive state.
  • the UE moves to the edge of cell11, so it needs to be reselected.
  • the reselected cells that meet the reselection conditions are cell31, cell32, cell21, and cell22.
  • the UE lists the cells cell31, cell32 , Cell21, cell22 are sent to gNB1.
  • gNB1 After receiving the reselection target cell list, gNB1 selects cell21 (determining that the base station gNB2 to which cell21 belongs and the current serving base station gNB1 are interconnected base stations) as the target cell and sends it to the UE. At the same time, gNB1 sends the UE context information through Xn Passed to gNB2.
  • the UE After the UE receives the identity of the cell cell 21 sent by gNB1, it reselects to the cell 21 cell.
  • the UE accesses to the cell cell11 (cell11 belongs to the base station gNB1), and then enters the inactive state.
  • the UE moves and enters the edge of cell11, and therefore needs to be reselected. After triggering the reselection mechanism, cell31 is reselected to meet the reselection conditions, and the UE sends the cell list cell31 to gNB1.
  • gNB1 determines that the base station to which cell31 belongs and it is a non-interconnected base station, sends a notification to the UE to enter the idle state, and releases the context information of the local UE at the same time.
  • the UE After the UE receives the state transition notification fed back by gNB1, it enters the idle state, and performs the cell access reselection process again.
  • FIG. 6 is a schematic structural diagram of a base station provided by an embodiment of the disclosure.
  • the base station includes: one or more processors 1 and a storage device 2; wherein, the storage device 2 stores one or more A program, when the one or more programs are executed by one or more processors 1, the one or more processors 1 implement the cell reselection method for inactive state terminals provided in the embodiments of the present disclosure.
  • the embodiment of the present disclosure also provides a computer-readable medium on which a computer program is stored, where the program is executed by a processor to implement the cell reselection method for a terminal in an inactive state provided in the embodiment of the present disclosure.
  • the functional modules/units in the system, and the device can be implemented as software, firmware, hardware, and appropriate combinations thereof.
  • the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may consist of multiple The physical components are executed cooperatively.
  • Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit.
  • Such software may be distributed on a computer-readable medium, and the computer-readable medium may include a computer storage medium (or a non-transitory medium) and a communication medium (or a transitory medium).
  • the term computer storage medium includes volatile and non-volatile data implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Sexual, removable and non-removable media.
  • Computer storage media include but are not limited to Random Access Memory (RAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM) , Flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (Digital Versatile Disc, DVD) or other optical disc storage, magnetic cartridges, magnetic tapes, magnetic disk storage or other magnetic A storage device, or any other medium that can be used to store desired information and can be accessed by a computer.
  • communication media usually contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery media.
  • Example embodiments have been disclosed herein, and although terminology is adopted, they are used and should only be interpreted as a general descriptive meaning, and are not used for the purpose of limitation. In some examples, unless otherwise indicated, the features, characteristics, and/or elements described in combination with a particular embodiment may be used alone, or may be used in combination with features, characteristics, and/or elements described in combination with other embodiments.

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Abstract

本文公开了一种非激活状态终端的小区重选方法。包括：获取目标终端发送的重选小区列表；根据所述重选小区列表中记载的小区信息确定重选结果，并将所述重选结果反馈至所述目标终端。本文还公开了一种基站和计算机可读介质。

Description

非激活状态终端的小区重选方法、基站和计算机可读介质
本申请要求在2020年04月01日提交中国专利局、申请号为202010252361.0的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本公开涉及通信技术领域，例如涉及一种非激活状态终端的小区重选方法、基站和计算机可读介质。
背景技术
在第五代移动通信***(the 5th Generation mobile communication system，5G)中，终端设备(User Equipment，UE)的状态引入了非激活(Inactive)状态，当UE在Inactive状态下移动到其他基站时，UE将在目标基站下进行小区重选接入，在该重选接入过程中，当UE确定出目标基站后，目标基站需要通过互连接口从之前给UE提供服务的最后一个服务基站处获取UE的上下文信息，同时该最后一个服务基站要将从核心网处接收的数据反传给目标基站。
发明内容
本公开提供一种非激活状态终端的小区重选方法、基站和计算机可读介质。
提供了一种非激活状态终端的小区重选方法，其中，包括：
获取目标终端发送的重选小区列表；根据所述重选小区列表中记载的小区信息确定重选结果，并将所述重选结果反馈至所述目标终端。
还提供了一种基站，包括：
一个或多个处理器；存储装置，其上存储有一个或多个程序，当所述一个或多个程序被所述一个或多个处理器执行，使得所述一个或多个处理器实现本公开所提供的非激活状态终端的小区重选方法。
还提供了一种计算机可读介质，其上存储有计算机程序，其中，所述程序被处理器执行时实现本公开所提供的非激活状态终端的小区重选方法。
附图说明
图1为本公开实施例提供的一种非激活状态终端的小区重选方法的流程图；
图2为本公开实施例提供的另一种非激活状态终端的小区重选方法的流程 图；
图3为本公开实施例提供的又一种非激活状态终端的小区重选方法的流程图；
图4为本公开实施例提供的再一种非激活状态终端的小区重选方法的流程图；
图5为本公开实施例提供的再一种非激活状态终端的小区重选方法的流程图；
图6为本公开实施例提供的一种基站的结构示意图。
具体实施方式
下面结合附图对本公开提供的非激活状态终端的小区重选方法、基站和计算机可读介质进行描述。
在下文中将参考附图描述示例实施例，但是所述示例实施例可以以不同形式来体现且不应当被解释为限于本文阐述的实施例。
本文所使用的术语仅用于描述实施例，且不意欲限制本公开。如本文所使用的，单数形式“一个”和“该”也意欲包括复数形式，除非上下文另外指出。当本文中使用术语“包括”和/或“由……制成”时，指定存在所述特征、整体、步骤、操作、元件和/或组件，但不排除存在或添加一个或多个其他特征、整体、步骤、操作、元件、组件和/或其群组。
虽然本文可以使用术语第一、第二等来描述多种元件/指令/请求，但这些元件/指令/请求不应当受限于这些术语。这些术语仅用于区分一个元件元件/指令/请求和另一元件元件/指令/请求。
除非另外限定，否则本文所用的所有术语(包括技术和科学术语)的含义与本领域普通技术人员通常理解的含义相同。诸如那些在常用字典中限定的那些术语应当被解释为具有与其在相关技术以及本公开的背景下的含义一致的含义，且将不解释为具有理想化或过度形式上的含义，除非本文如此限定。
5G***的组网分为中心单元(Central Unit，CU)和分布单元(Distribute Unit，DU)，接入5G***的UE有三种状态，分别为连接(connect)状态、空闲(idle)状态和inactive状态，其中，connect状态是UE在CU和DU侧都激活的状态，idle状态是指UE上下文释放的状态，inactive状态是idle和connect的一种中间状态，即CU侧保留UE上下文信息，仅DU侧释放的状态。UE从inactive状态进入connect状态相对于从idle状态进入connect状态而言，节省了建立UE上下文的时间。当UE长时间不发送和接收数据时，其由connect状态进入inactive 状态，在inactive状态下，当UE发生移动并移动到其他基站下时，UE需要确定新的目标基站以进行小区重选接入。相关技术中，UE在确定出目标基站后，在UE接入目标基站的过程中，目标基站从UE的原服务基站处获取UE的上下文信息，以完成接入过程，而当目标基站与原服务基站之间无法直接进行交互时，往往导致原服务基站会长时间保留UE的上下文信息，且导致UE接入目标基站的时延过长。本公开提供的非激活状态终端的小区重选方法即用以解决上述技术问题。
本公开提供的非激活状态终端的小区重选方法以5G***中的基站作为执行主体。图1为本公开实施例提供的一种非激活状态终端的小区重选方法的流程图，该方法中，以目标终端所归属的当前服务基站作为执行主体，如图1所示，该方法包括：
步骤S101、获取目标终端发送的重选小区列表。
步骤S102、根据重选小区列表中记载的小区信息确定重选结果，并将重选结果反馈至目标终端。
当目标终端在inactive状态下移动到当前服务基站的边缘时，将触发小区重选机制，目标终端将获取在当前位置下适合进行重选接入的重选小区列表，该重选小区列表中包含有可重选接入的小区的小区标识，重选小区列表的个数可以为一个，也可以为多个。本公开中，目标终端在获取到重选小区列表后，将重选小区列表发送给当前的服务基站，服务基站在获取到重选小区列表后，根据重选小区列表中所记载的小区信息确定重选结果，并将重选结果反馈至目标终端，从而使得当前服务基站能够根据重选结果及时对目标终端的上下文信息进行处理(释放上下文信息或者传送上下文信息并释放上下文信息)。重选结果中包括所确定出的目标小区或者无法确定出目标小区。
当前的服务基站是指目标终端从connect状态进入inactive状态时所处的小区的归属基站。
本公开提供的非激活状态终端的小区重选方法通过由目标终端的当前服务基站来获取目标终端的重选小区列表，并根据小区重选列表中所记载的小区信息确定出重选结果，并将重选结果反馈至目标终端，使得目标终端的当前服务基站能够在目标终端进行小区重选的过程中确定出重选结果，从而使得当前服务基站能够在目标终端进行小区重选的过程中即进行目标终端上下文的处理，相较于相关技术，由于当前服务基站能够提前对目标终端的上下文信息进行处理，从而一方面降低了终端后续接入目标小区的时延，另一方面当前服务基站能够准确判断出目标终端的上下文信息需要释放的时机，从而避免了当前服务基站由于长时间保存目标终端的上下文信息而导致的存储资源浪费的问题。
图2为本公开实施例提供的另一种非激活状态终端的小区重选方法，如图2所示，在一些实施例中，该方法包括上述步骤S101和步骤S102，其中，步骤S102包括：
步骤S1021a、响应于重选小区列表中存在归属于本服务基站的小区，从重选小区列表内所记载的归属于本服务基站的小区中选择信号强度最强的一个小区作为目标小区，并将目标小区作为重选结果发送至目标终端。
本公开实施例中，在目标终端的当前服务基站确定重选结果的过程中，当重选小区列表中包含归属于当前服务基站下的小区时，则说明目标终端当前所处的位置仍然处于当前服务基站覆盖的范围，此时，选择当前服务基站下的小区作为目标小区以作为重选结果，可以避免对目标终端的信息上下文进行传递，从而使得目标终端在发生重选后在从inactive状态进入connect状态的时候不需要再次获取目标终端的上下文信息，从而缩短了inactive状态下终端的接入时延，实现了目标终端的快速接入；目标终端在接收到当前服务基站反馈的携带有目标小区的反馈消息时，直接接入到该目标小区。例如，当从重选小区列表内所记载的归属于本服务基站的小区中确定出目标小区时，可从重选小区列表内所记载的归属于本服务基站的小区中选择信号强度最强的一个小区作为目标小区。
在实际应用中还可基于其他方式进行目标小区的确定，在一些实施例中，可以从重选小区列表内所记载的归属于本服务基站的小区中随机选择一个小区作为目标小区；在其他一些实施例中，还可以将重选小区列表内所记载的归属于本服务基站的小区中的第一个小区作为目标小区。本公开不对目标小区的确定方法做限定，只要能从重选小区列表内所记载的归属于本服务基站的小区中选择出目标小区即可。
图3为本公开实施例提供的又一种非激活状态终端的小区重选方法，如图3所示，在一些实施例中，该方法包括上述步骤S101和步骤S102，其中，步骤S102包括：
步骤S1021b、响应于重选小区列表中不存在归属于本服务基站的小区但存在归属于本服务基站的互连基站的小区，从重选小区列表内所记载的归属于本服务基站的互连基站的小区中选择信号强度最强的一个小区作为目标小区，并将目标小区作为重选结果发送至目标终端。
本公开中，互连基站是指与本服务基站通过互连接口实现交互的基站。
本公开实施例中，在目标终端的当前服务基站确定重选结果的过程中，当重选小区列表中不存在归属于本服务基站的小区，但存在归属于本服务基站的互连基站的小区时，当前服务基站从重选小区列表内所记载的归属于本服务基 站的互连基站的小区中确定出目标小区作为重选结果，由于当前服务基站的互连基站与当前服务基站之间能够直接进行信息交互，因而，选择互连基站下的小区作为目标小区进行接入，可以使当前服务基站上存储的目标终端的上下文信息直接传递至目标基站，而无需借助于核心网进行传递，从而实现目标终端的上下文信息的快速传递，进而降低了目标终端后续接入目标小区的时延；同时，目标终端的当前服务基站也确定出其自身所存储的目标终端的上下文信息需要释放，从而能够在将目标终端的上下文信息传送给目标基站后，及时释放上下文信息，从而避免自身存储资源被长期占用。
本公开中，当从重选小区列表内所记载的归属于本服务基站的互连基站的小区中确定出目标小区时，可从重选小区列表内所记载的归属于本服务基站的互连基站的小区中选择信号强度最强的一个小区作为目标小区。本公开还可基于其他方式进行目标小区的确定，在一些实施例中，可以从重选小区列表内所记载的归属于本服务基站的互连基站的小区中随机选择一个小区作为目标小区；在其他一些实施例中，还可以将重选小区列表内所记载的归属于本服务基站的互连基站的小区中的第一个小区作为目标小区。本公开不对目标小区的确定方法做限定，只要能从重选小区列表内所记载的归属于本服务基站的互连基站的小区中选择出目标小区即可。
在一些实施例中，在上述步骤S1021b之后，还包括：
步骤S1022b、将目标终端的上下文信息发送给目标小区所归属的目标基站，并释放本服务基站所记载的目标终端的上下文信息。
目标终端的当前服务基站在选择出与本服务基站互连的基站下的小区作为重选结果后，将自身存储的目标终端的上下文信息发送给目标基站，以在目标终端进行目标小区接入之前提前传递目标终端的上下文信息，并进而释放目标终端的上下文信息，以及时释放自身的存储资源。
在一些实施例中，在步骤S1022b中，将目标终端的上下文信息发送给目标小区所归属的目标基站可借助于目标基站与当前服务基站之间的互连接口实现。
在一些实施例中，目标基站与当前服务基站之间的互连接口为Xn接口。
图4为本公开实施例提供的再一种非激活状态终端的小区重选方法，如图4所示，在一些实施例中，该方法包括上述步骤S101和步骤S102，其中，步骤S102包括：
步骤S1021c、响应于重选小区列表中不存在归属于本服务基站的小区和归属于本服务基站的互连基站的小区，将空闲状态切换指令作为重选结果发送至目标终端。
本公开实施例中，在目标终端的当前服务基站确定重选结果的过程中，当重选小区列表中所包含所有小区既不归属于当前的服务基站下，也不归属于与当前的服务基站互连的互连基站下时，说明目标终端若继续进行该小区重选流程将会有较低的接入成功率，此时，当前服务基站通知目标终端进入idle状态，以使目标终端在进入idle状态后重新进入小区重选接入机制，从而在一定程度上提高了接入成功率。
在一些实施例中，在执行步骤S1021c的同时，还包括：
步骤S1022c、释放目标终端的上下文信息。
在重选小区列表中不存在归属于当前服务基站的小区和归属于当前服务基站的互连基站的小区的情况下，当前服务基站主动释放目标终端的上下文信息，从而使得当前服务基站的存储资源能够得到及时的释放，进而避免了当前服务基站的存储资源被长时间占用，避免了资源浪费。
图5为本公开实施提供的再一种非激活状态终端的小区重选方法，如图5所示，在一些实施例中，该方法包括上述步骤S101和步骤S102，其中，步骤S102包括：
步骤S10200、判断重选小区列表中是否存在归属于本服务基站的小区。
在步骤S10200中，当判断出重选小区列表中存在归属于本服务基站的小区时，执行上述步骤S1021a；当判断出重选小区列表中不存在归属于本服务基站的小区时，执行步骤S10201。
步骤S10201、判断重选小区列表中是否存在归属于本服务基站的互连基站的小区。
在步骤S10201中，当判断出重选小区列表中存在归属于本服务基站的互连基站的小区时，执行上述步骤S1021b；当判断出重选小区列表中不存在归属于本服务基站的互连基站的小区时，执行上述步骤S1021c。
本公开实施例中，当前服务基站在获取到目标终端发送的重选小区列表后，对重选小区列表中的小区进行识别判断。重选小区列表中记载了多个可重选小区的标识，该小区的标识可标识出该小区属于哪个基站下，同时，当前服务基站内存储了与其自身具有互连关系的互连基站的名单，因此，当前服务基站根据小区的标识及自身所存储的互连基站的名单即可确定出重选小区列表中哪些小区归属于自身，哪些小区归属于互连基站。
在上述实施例中，不同步骤之间可以进行组合以得到新的技术方案，该新的技术方案也应属于本公开的保护范围。
下面以具体场景来对本公开提供的非激活状态终端的小区重选方法进行描述。
场景一：
(1)UE接入在小区cell11(cell11归属于基站(next generation NodeB，gNB)1)，然后进入inactive状态。
(2)UE发生移动而进入到cell11的边缘，因而需要进行重选，触发重选机制后，重选出符合重选条件的小区有cell21，cell12和cell13，UE将小区列表cell21、cell12、cell13发给gNB1。
(3)gNB1收到重选目标小区列表后，选择cell12(cell12与cell11同归属于基站gNB1)作为目标小区发给UE。
(4)UE接收到gNB1发送的包含小区cell12的标识后，重选到cell12小区。
场景二：
(1)UE接入在小区cell11(cell11归属于基站gNB1)，然后进入inactive状态。
(2)UE发生移动而进入到cell11的边缘，因而需要进行重选，触发重选机制后，重选出符合重选条件的小区有cell31、cell32、cell21和cell22，UE将小区列表cell31、cell32、cell21、cell22发给gNB1。
(3)gNB1收到重选目标小区列表后，选择cell21(确定出cell21所归属的基站gNB2与当前服务基站gNB1为互连基站)作为目标小区发给UE，同时gNB1将UE的上下文信息通过Xn口传递给gNB2。
(4)UE接收到gNB1发送的包含小区cell21的标识后，重选到cell21小区。
场景三：
(1)UE接入在小区cell11(cell11归属于基站gNB1)，然后进入inactive状态。
(2)UE发生移动而进入到cell11的边缘，因而需要进行重选，触发重选机制后，重选出符合重选条件的小区有cell31，UE将小区列表cell31发给gNB1。
(3)gNB1确定cell31所归属的基站与本身为非互连基站，给UE发送进入idle态的通知，同时释放本地的UE的上下文信息。
(4)UE接收到gNB1反馈的状态转移通知后，进入idle状态，并重新进行小区接入重选流程。
图6为本公开实施例提供的一种基站的结构示意图，如图6所示，该基站 包括：一个或多个处理器1及存储装置2；其中，存储装置2上存储有一个或多个程序，当该一个或多个程序被一个或多个处理器1执行，使得一个或多个处理器1实现本公开实施例所提供的非激活状态终端的小区重选方法。
本公开实施例还提供一种计算机可读介质，其上存储有计算机程序，其中，程序被处理器执行时实现本公开实施例所提供的非激活状态终端的小区重选方法。
上文中所公开方法中的全部或一些步骤、***、装置中的功能模块/单元可以被实施为软件、固件、硬件及其适当的组合。在硬件实施方式中，在以上描述中提及的功能模块/单元之间的划分不一定对应于物理组件的划分；例如，一个物理组件可以具有多个功能，或者一个功能或步骤可以由多个物理组件合作执行。一些物理组件或所有物理组件可以被实施为由处理器，如中央处理器、数字信号处理器或微处理器执行的软件，或者被实施为硬件，或者被实施为集成电路，如专用集成电路。这样的软件可以分布在计算机可读介质上，计算机可读介质可以包括计算机存储介质(或非暂时性介质)和通信介质(或暂时性介质)。如本领域普通技术人员公知的，术语计算机存储介质包括在用于存储信息(诸如计算机可读指令、数据结构、程序模块或其他数据)的任何方法或技术中实施的易失性和非易失性、可移除和不可移除介质。计算机存储介质包括但不限于随机存取存储器(Random Access Memory，RAM)、只读存储器(Read-Only Memory，ROM)、带电可擦可编程只读存储器(Electrically Erasable Programmable Read-Only Memory，EEPROM)、闪存或其他存储器技术、光盘只读存储器(Compact Disc Read-Only Memory，CD-ROM)、数字多功能盘(Digital Versatile Disc，DVD)或其他光盘存储、磁盒、磁带、磁盘存储或其他磁存储装置、或者可以用于存储期望的信息并且可以被计算机访问的任何其他的介质。此外，通信介质通常包含计算机可读指令、数据结构、程序模块或者诸如载波或其他传输机制之类的调制数据信号中的其他数据，并且可包括任何信息递送介质。
本文已经公开了示例实施例，并且虽然采用了术语，但它们仅用于并仅应当被解释为一般说明性含义，并且不用于限制的目的。在一些实例中，除非另外指出，否则可单独使用与特定实施例相结合描述的特征、特性和/或元素，或可与其他实施例相结合描述的特征、特性和/或元件组合使用。

Claims (10)

  1. 一种非激活状态终端的小区重选方法，包括：
    获取目标终端发送的重选小区列表；
    根据所述重选小区列表中记载的小区信息确定重选结果，并将所述重选结果反馈至所述目标终端。
  2. 根据权利要求1所述的方法，其中，所述根据所述重选小区列表中记载的小区信息确定重选结果，并将所述重选结果反馈至所述目标终端，包括：
    响应于所述重选小区列表中存在归属于本服务基站的小区，从所述重选小区列表内所记载的所述归属于本服务基站的小区中选择信号强度最强的一个小区作为目标小区，并将所述目标小区作为所述重选结果发送至所述目标终端。
  3. 根据权利要求1所述的方法，其中，所述根据所述重选小区列表中记载的小区信息确定重选结果，并将所述重选结果反馈至所述目标终端，包括：
    响应于所述重选小区列表中不存在归属于本服务基站的小区但存在归属于本服务基站的互连基站的小区，从所述重选小区列表内所记载的所述归属于本服务基站的互连基站的小区中选择信号强度最强的一个小区作为目标小区，并将所述目标小区作为所述重选结果发送至所述目标终端。
  4. 根据权利要求3所述的方法，在所述从所述重选小区列表内所记载的所述归属于本服务基站的互连基站的小区中选择信号强度最强的一个小区作为目标小区之后，还包括：
    将所述目标终端的上下文信息发送给所述目标小区所归属的目标基站，并释放本服务基站所记载的所述目标终端的上下文信息。
  5. 根据权利要求4所述的方法，其中，所述将所述目标终端的上下文信息发送给所述目标小区所归属的目标基站，包括：
    通过所述目标基站与本服务基站之间的互连接口，将所述目标终端的上下文信息发送给所述目标基站。
  6. 根据权利要求1所述的方法，其中，所述根据所述重选小区列表中记载的小区信息确定重选结果，并将所述重选结果反馈至所述目标终端，包括：
    响应于所述重选小区列表中不存在归属于本服务基站的小区和归属于本服务基站的互连基站的小区，将空闲状态切换指令作为所述重选结果发送至所述目标终端。
  7. 根据权利要求6所述的方法，在所述将空闲状态切换指令作为所述重选结果发送至所述目标终端的同时，还包括：
    释放所述目标终端的上下文信息。
  8. 根据权利要求1-7中任一项所述的方法，其中，所述根据所述重选小区列表中记载的小区信息确定重选结果，并将所述重选结果反馈至所述目标终端，包括：
    判断所述重选小区列表中是否存在归属于本服务基站的小区；
    响应于所述重选小区列表中不存在所述归属于本服务基站的小区，判断所述小区列表中是否存在归属于本服务基站的互连基站的小区。
  9. 一种基站，包括：
    至少一个处理器；
    存储装置，存储有至少一个程序，当所述至少一个程序被所述至少一个处理器执行，使得所述至少一个处理器实现如权利要求1-8中任一项所述的非激活状态终端的小区重选方法。
  10. 一种计算机可读介质，存储有计算机程序，其中，所述程序被处理器执行时实现如权利要求1-8中任一项所述的非激活状态终端的小区重选方法。
PCT/CN2021/075905 2020-04-01 2021-02-08 非激活状态终端的小区重选方法、基站和计算机可读介质 WO2021196897A1 (zh)

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