WO2012103772A1 - 一种基于CoMP的UE接入多小区的方法和系统 - Google Patents

一种基于CoMP的UE接入多小区的方法和系统 Download PDF

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Publication number
WO2012103772A1
WO2012103772A1 PCT/CN2011/084516 CN2011084516W WO2012103772A1 WO 2012103772 A1 WO2012103772 A1 WO 2012103772A1 CN 2011084516 W CN2011084516 W CN 2011084516W WO 2012103772 A1 WO2012103772 A1 WO 2012103772A1
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cell
rsrp
measurement
base station
comp
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PCT/CN2011/084516
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English (en)
French (fr)
Inventor
杜娟
靳日飞
樊荣
贺胜
赵瑜
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中兴通讯股份有限公司
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Publication of WO2012103772A1 publication Critical patent/WO2012103772A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference

Definitions

  • the present invention relates to a Coordinated Multi-Point (CoMP) technology in an evolved LTE (Long Term Evolution Advanced, LTE-Advanced), and more particularly to a CoMP-based User Equipment (UE) accessing a multi-cell.
  • CoMP Coordinated Multi-Point
  • LTE-Advanced is a candidate technology solution for the fourth generation mobile communication technology (4G). Its performance index is further enhanced based on LTE.
  • the system supports a maximum bandwidth of 100MHz, and the supported downlink peak rate is iGbit/s.
  • the spectrum efficiency has been improved to 30bit/s/Hz;
  • the uplink peak rate is 500Mbit/s, and the spectral efficiency has been increased to 15bit/s/Hz.
  • the above performance of LTE-Advanced puts forward higher requirements on the throughput of the cell, especially the cell edge throughput. Therefore, LTE-Advanced proposes a CoMP method to improve the cell edge coverage rate and improve the cell transmission rate.
  • the CoMP includes downlink CoMP transmission and uplink CoMP reception.
  • the uplink CoMP receiving improves the cell edge user throughput through the joint reception of the user data by multiple cells; the downlink CoMP transmission can be divided into joint processing according to whether the service data can be obtained at multiple coordination points (Joint Processing, JP) ) and Coordinated Scheduling/Beamforming (CS/CB).
  • JP Joint Processing
  • CS/CB Coordinated Scheduling/Beamforming
  • the uplink CoMP reception mainly uses the joint processing method to obtain the transmission gain, and cooperates to reduce the inter-cell interference.
  • the 3rd Generation Partnership Project (3GPP) defines a cell as a serving cell, a coordinated cell set, and a measurement cell set.
  • a serving cell is a single cell used to transmit a Physical Downlink Control CHannel (PDCCH);
  • a coordinated cell set is a set of cells that directly or indirectly send a Physical Downlink Shared CHannel (PDSCH) to the UE. This collection is correct
  • the UE is transparent and may also be opaque to the UE; the measurement cell set is a set of cells reporting channel state information connected to the UE.
  • the determination of the coordinated cell set and the measured cell set of the UE is performed after the initial access of the UE, which brings a problem: if the UE is initially accessed, it is at the edge of the cell, as shown in FIG. 1 As shown, the UE can only join the CoMP after the initial access, and improve the cell edge throughput through the CoMP technology, which causes the edge throughput of the cell to become a bottleneck when the UE initially accesses.
  • the main purpose of the present invention is to provide a method and system for a UE to access a multi-cell based on a CoMP, which can solve the problem that an edge UE cannot join the CoMP during initial access, thereby ensuring initial access of the edge UE.
  • the throughput at the cell edge is to provide a method and system for a UE to access a multi-cell based on a CoMP, which can solve the problem that an edge UE cannot join the CoMP during initial access, thereby ensuring initial access of the edge UE.
  • the throughput at the cell edge is to provide a method and system for a UE to access a multi-cell based on a CoMP, which can solve the problem that an edge UE cannot join the CoMP during initial access, thereby ensuring initial access of the edge UE.
  • the throughput at the cell edge is to provide a method and system for a UE to access a multi-cell based on a CoMP, which can solve the problem that an edge UE cannot join the CoMP
  • the invention discloses a method for a multi-point cooperative CoMP-based user equipment UE to access a multi-cell, the method includes: the base station sends a system message that carries a UE to report a lowest threshold of the measurement cell to the UE; after receiving the system message, the UE according to the The lowest threshold determines the corresponding serving cell and the measured cell set, and reports the measured cell set to the base station; the base station performs information interaction with the measured cell reported by the UE, selects the coordinated cell, and notifies the selected coordinated cell set to the UE; After receiving the notification and feedback, join CoMP.
  • the threshold is defined as: a reference signal received power RSRP measurement value, or an RSRP difference value, the RSRP measurement value is an absolute value of the RSRP, and the RSRP difference value is a difference value from the serving cell RSRP measurement value.
  • the UE reports the measurement cell set as follows: the UE sends a radio resource control RRC connection request message to the base station, where the RRC connection request message carries related information of the measurement cell set, including: a cell ID or a cell ID of each measurement cell +RSRP measurement value, or cell ID+RSRP difference value. If carrying the cell ID+RSRP difference value, you also need to carry the RSRP of the serving cell. Measurements.
  • the base station selects a coordinated cell as:
  • the base station performs information exchange with the measurement cell reported by the UE, and selects a cell with a current load as a coordinated cell; or
  • the base station performs information exchange with all measurement cells reported by the UE to select a coordinated cell according to the RSRP measurement value or the RSRP difference value reported by the UE; or
  • the base station performs information interaction with all measurement cells reported by the UE according to the channel quality indication CQI/precoding matrix indicated by the UE to indicate the PMI/rank indication RI value and the RSRP measurement value, or the RSRP difference value, and selects the coordinated cell.
  • the base station notifies the UE of the selected coordinated cell set to: the base station notifies the coordinated cell to the UE by using an RRC connection setup message or an RRC connection reconfiguration message.
  • the method further includes: in the cell search process, the UE selects the cell with the highest RSRP measurement value to stay, and simultaneously stores the cell information not lower than the lowest threshold, including the cell ID and Corresponding RSRP measurement, or RSRP differential value.
  • the present invention also discloses a CoMP-based UE accessing a multi-cell system, the system comprising: a base station and a UE;
  • the base station is configured to send a system message that carries the lowest threshold of the measurement cell to the UE, and receive the measurement cell set reported by the UE; perform information interaction with the measurement cell reported by the UE, select a coordinated cell, and select the coordinated cell.
  • the coordinated cell set notifies the UE to receive the feedback of the UE; the UE, after receiving the system message, determines the corresponding serving cell and the measured cell set according to the lowest threshold, and reports the measured cell set to the base station; After the coordinated cell set notified by the base station, feedback is performed, and CoMP is added.
  • the UE After receiving the system message, the UE is further configured to: when the cell search process, select a cell with the highest RSRP measurement value to stay, and store the cell information that reaches the lowest threshold, including the cell ID and the corresponding RSRP measurement value, Or RSRP differential value.
  • the base station is specifically configured to: notify the coordinated cell to the UE by using an RRC connection setup message or an RRC connection reconfiguration message.
  • the UE is specifically configured to: send a radio resource control RRC connection request message to the base station, and carry the related information of the measurement cell set in the RRC connection request message, including: a cell ID of each measurement cell, or a cell ID+RSRP measurement value, Or the cell ID+RSRP difference value, if carrying the cell ID+RSRP difference value, also carries the RSRP measurement value of the serving cell.
  • the base station sends a system message that the UE reports the lowest threshold of the measurement cell to the UE; after receiving the system message, the UE determines the corresponding service according to the minimum threshold.
  • the cell and the measurement cell are set, and the measurement cell set is reported to the base station; the base station performs information interaction with the measurement cell reported by the UE, selects the coordinated cell, and notifies the UE of the selected coordinated cell set; after receiving the notification and feedback, the UE receives the feedback , join CoMP.
  • the UE that is, the edge UE can participate in the CoMP at the latest after the RRC connection reconfiguration message and the RRC connection setup message at the latest, and obtain the CoMP in the cell edge throughput.
  • the present invention can solve the problem that the edge UE cannot join the CoMP during the initial access, and ensures the throughput of the edge of the edge UE when the initial access is performed.
  • FIG. 1 is a schematic structural diagram of a cell at the edge of a cell when the UE initially accesses
  • FIG. 2 is a schematic flowchart of a method for implementing a method for a UE to access a multi-cell based on a CoMP according to the present invention
  • FIG. 3 is a schematic structural diagram of all cells searched by a UE during a cell search process
  • FIG. 4 is a structure of a MAC CE of a first mode in the first embodiment.
  • FIG. 5 is a schematic structural diagram of a MAC PDU subheader of mode 2 in Embodiment 1;
  • FIG. 6 is a schematic structural diagram of a MAC CE in the second mode in the first embodiment
  • FIG. 7 is a schematic structural diagram of a MAC CE in the third mode in the first embodiment. detailed description
  • the basic idea of the present invention is that the base station sends a system message carrying the lowest threshold of the measurement cell to the UE, and after receiving the system message, the UE determines the corresponding serving cell and the measured cell set according to the lowest threshold, and measures the cell.
  • the set is reported to the base station; the base station performs information exchange with the measurement cell reported by the UE, selects a coordinated cell set, and notifies the UE of the coordinated cell set; after receiving the notification and feedback, the UE joins the CoMP.
  • the UEs in the present invention are all edge UEs, that is, UEs located at the edge of the cell.
  • FIG. 2 is a schematic flowchart of a method for a UE to access a multi-cell based on a CoMP according to the present invention. As shown in FIG. 2, the implementation steps of the process are as follows:
  • Step 201 The base station sends a system message that carries the UE to report the lowest threshold of the measurement cell to
  • the base station sends a system message to the UE, where the system message carries the lowest threshold of the measured cell to the base station.
  • the threshold value there are two ways to define the threshold value: The first one defines the threshold value as the absolute value of the Reference Signal Receiving Power (RSRP), that is, the RSRP measurement value; It is defined as the difference value from the RSRP measurement value of the serving cell, that is, the RSRP difference value.
  • RSRP Reference Signal Receiving Power
  • the base station in the initial access process of the UE, cannot obtain the measurement cell set reported by the UE, and the measurement cell set is determined by the base station.
  • the UE in the initial access process of the UE, the UE actively reports The measurement cell is measured, and the reported measurement cell needs to meet the minimum threshold, which is carried by the system message sent by the base station.
  • Step 202 After receiving the system message, the UE determines, according to the minimum threshold, a service cell and a measurement cell set corresponding to the UE.
  • the UE selects the cell with the highest RSRP, that is, the serving cell to camp, and stores the cell information that reaches the lowest threshold, including the cell ID. And measured RSRP measurements, or RSRP differential values.
  • Figure 3 is a schematic diagram of all cell structures searched by the UE during the cell search process.
  • the service cell and the measurement cell can be determined as follows:
  • Method 1 During the cell search process, the UE searches for a total of nine cells from cell 1 to cell 9 and ranks them according to their RSRP measurements, which are RSRP 1 >RSRP 5 >RSRP 6 >RSRP 3 >RSRP 4 > RSRP 9 >RSRP 2 >RSRP 7 >RSRP 8 , if the lowest threshold is taken as the absolute threshold RSRPn ⁇ , and if RSRP ⁇ RSRP RSRP ⁇ RSRP ⁇ RSIO ⁇ >RSRP 9 >RSRP min >RSRP 2 >RSRP 7 >RSRP 8 , then Cell 1 is a serving cell, and cells 5, 6, 3, 4, and 9 are measurement cells.
  • Method two UE in a cell search, the cell search for a total of nine cells to the cell 9, its RSRP measurements descending order, followed RSRP ⁇ RSRP ⁇ RSRP ⁇ RSRP ⁇ RSRP 4> RSRP 9> RSRP 2 >RSRP 7 >RSRP 8 , if the lowest threshold is taken as the differential threshold And if (RSRP factory RSRP 5 ) ⁇ (RSRP factory RSRP 6 ) ⁇ (RSRP factory RSRP 3 ) ⁇ (RSRP "RSRP 4 " ⁇ (RSRP - RSRP 9 ) ⁇ RSRP min , then cell 1 is the serving cell, cell 5, 6, 3, 4, and 9 are measurement cells.
  • the value range of the lowest threshold can be limited to 4 to 8, which can be configured through the background.
  • the base station notifies the UE of the enumeration value, and the UE can map to the corresponding dbm value according to the enumeration value.
  • the UE when the UE selects the cell with the highest RSRP measurement value, the other related cell information is discarded, and the UE of the present invention selects the RSRP measurement value of the searched cell, and selects the highest RSRP measurement value.
  • the cell resides, and stores the cell ID and the corresponding RSRP measurement value, or the RSRP difference value, which is not lower than the lowest threshold, and then discards other related information of the cell that is lower than the lowest threshold.
  • Step 203 The UE reports the measurement cell set to the base station.
  • the UE sends a radio resource control (RRC) connection request message to the base station, where the RRC connection request message carries related information of the measurement cell set, including: small for each measurement cell
  • the area ID, or the cell ID+RSRP measurement value, or the cell ID+RSRP difference value, if carrying the cell ID+RSRP difference value, also needs to carry the RSRP measurement value of the serving cell.
  • RRC radio resource control
  • the UE does not search for a cell that is not lower than the lowest threshold during the cell search process, the UE does not need to carry the measurement cell related information when transmitting the RRC connection request message.
  • the measurement cell set reported by the UE is carried in a MAC Control Element (MAC CE), and may use a reserved logical channel identifier (LCID) to carry the measurement cell set, and the base station parses the MAC protocol data unit. After the header of the (PDU), the measurement cell related information is directly reported to the Radio Network Controller (RNC).
  • MAC CE MAC Control Element
  • LCID logical channel identifier
  • RNC Radio Network Controller
  • Step 204 The base station performs information interaction with the measurement cell reported by the UE, selects a coordinated cell, and notifies the UE of the coordinated cell set;
  • the base station performs information exchange with the measurement cell carried in the RRC connection request message, selects the coordinated cell, and notifies the coordinated cell to the UE through the RRC connection setup message or the RRC connection reconfiguration message.
  • Mode 1 The base station performs information exchange with the measured cell reported by the UE, and selects a cell with a light load, directly as a coordinated cell, and carries it in The RRC connection setup message is sent to the UE.
  • Manner 2 The base station performs information exchange with all the measurement cells reported by the UE according to the RSRP measurement value or the RSRP difference value reported by the UE, selects a coordinated cell, and sends a message to the UE through the RRC connection establishment message.
  • Manner 3 The base station according to the channel quality indicator (CQI) / Precoding Matrix Indicator (PMI) / Rank Indication (RI) value, and RSRP measurement value, or RSRP The difference value, the information is exchanged with all the measurement cells reported by the UE, and the coordinated cell is selected, and is carried in the RRC connection reconfiguration message and sent to the UE;
  • the CQI/PMI/RI configuration is sent by the base station when the RRC connection setup message is sent to the UE, and the CQI request is set to 1 in the DCI0 sent after the RRC connection setup message, triggering the non-periodic CQI/PMI on the UE.
  • the UE not only reports the CQI/PMI/RI of the serving cell, but also reports the CQI/PMI/RI of the measurement cell.
  • the base station obtains the CQI/PMI/RI information reported by the UE, according to the CQI/PMI/RI And the RSRP measurement value, or the RSRP difference value, and the information exchanged by all the measurement cells reported by the UE, and the coordinated cell is selected, and is carried in the RRC connection reconfiguration message and sent to the UE.
  • Step 205 After receiving the notification and feedback, the UE joins the CoMP.
  • the UE after receiving the notification from the base station, the UE sends an ACK feedback to the RRC connection setup message. After receiving the ACK feedback, the base station directly enters the CoMP cell set to obtain the gain brought by the CoMP.
  • Manner 1 The UE carries only the cell ID of the measurement cell in the MAC CE of the RRC connection request message.
  • the structure of the MAC CE is as shown in FIG. 4 .
  • the LCG ID is taken as the value currently reserved in the protocol, and the Cell lD is the cell ID, which can be represented by 14 bits. If there are multiple cell IDs, multiple MAC CEs are required.
  • the UE carries the cell ID and the RSRP measurement value of the measurement cell in the MAC CE of the RRC connection request message.
  • the structure of the MAC PDU subheader is shown in FIG. 5, and the structure of the MAC CE is shown in FIG. 6.
  • the value of the LCID in the sub-header is the value currently reserved in the protocol.
  • the L length can be 7 bits, that is, the MAC CE can be up to 128 bytes.
  • the MAC CE is composed of two parts: the Cell ID and the RSRP.
  • the Cell lD can occupy 9 bits.
  • the RSRP measurement can occupy 7 bits.
  • the UE carries the cell ID and the RSRP difference value of the measurement cell in the MAC CE of the RRC connection request message, and the MAC PDU subheader is the same as that in the second mode.
  • the structure of the MAC CE is as shown in FIG. 7.
  • the MAC CE is composed of the RSRP measurement value of the serving cell, the measurement cell Cell ID, and the RSRP difference value.
  • the RSRP measurement value of the serving cell can be represented by 8 bits
  • the measurement cell Cell ID can be represented by 9 bits
  • the RSRP differential value can be represented by 3 bits
  • the rest 4bit can be reserved.
  • the three methods in which the base station selected in step 204 selects a coordinated cell and notifies the selected coordinated cell to the UE are specifically described.
  • Method 1 The base station checks the measured cell ID reported by the UE through the RRC connection request message, and does not need the RSRP measurement value for the selection of the coordinated cell, but only performs message interaction with all the measured cells reported by the UE, and checks which measurement cells have the capability to perform CoMP.
  • the selected cooperative cell is notified to the UE by the selected coordinated cell by using an RRC connection setup message.
  • the RRC connection setup message may not notify the specific cell ID, but notify the cell ID index. For example, the index 0 corresponds to the first cell ID in the RRC connection request message MAC CE, and the index 1 corresponds to the second cell ID. And so on.
  • Method 2 The base station uses the RSRP measurement value or the RSRP difference value carried by the UE in the RRC connection request message as the measurement information for the selection of the coordinated cell, and notifies the UE of the selected coordinated cell by using the RRC connection setup message.
  • the specific cell ID may not be notified, but only the cell ID index is notified. For example, index 0 corresponds to the first cell ID in the RRC connection request message MAC CE, and index 1 corresponds to the second cell. ID, and so on.
  • Method 3 The base station uses the CQI/PMI/RI and the RSRP measurement value or the RSRP difference value reported by the UE as the measurement information for the selection of the coordinated cell.
  • the RRC connection setup message carries the CQI configuration information, including the aperiodic configuration and the periodic configuration, and the base station sends the RRC connection.
  • the CQI request is set to 1 and the UE is triggered to perform the aperiodic CQI reporting.
  • the UE not only needs to report the CQI/PMI/RI of the serving cell, but also needs to report the CQI of the measured cell.
  • the base station After receiving the CQI/PMI/RI of the serving cell and the CQI/PMI/RI of the measurement cell, the base station is used for the decision of the coordinated cell together with the RSRP measurement value or the RSRP difference value reported by the UE.
  • the cell ID index may be notified to the UE without the specific cell ID, for example, the index 0 corresponds to the first cell ID in the RRC connection request message MAC CE, and the index 1 corresponds to the second cell ID. analogy.
  • the present invention further provides a system for a UE to access a multi-cell based on a CoMP, including: a base station and a UE;
  • the base station is configured to send a system message that carries the lowest threshold of the measurement cell to the UE, and receive the measurement cell set reported by the UE; perform information interaction with the measurement cell reported by the UE, select a coordinated cell, and select the coordinated cell.
  • the coordinated cell set notifies the UE to receive the feedback of the UE; the UE, after receiving the system message, determines the corresponding serving cell and the measured cell set according to the lowest threshold, and reports the measured cell set to the base station; After the coordinated cell set notified by the base station, feedback is performed, and CoMP is added.
  • the UE After receiving the system message, the UE is further configured to select, in the cell search process, the cell with the highest RSRP measurement value, that is, the serving cell camping, and store the cell information not lower than the lowest threshold, including the cell ID and the corresponding RSRP. Measured value, or RSRP differential value.
  • the UE is specifically configured to: send a radio resource control RRC connection request message to the base station, and carry the related information of the measurement cell set in the RRC connection request message, including: a cell ID of each measurement cell, or a cell ID+RSRP measurement value, or a cell
  • the ID+RSRP differential value carries the RSRP measurement value of the serving cell if it carries the cell ID+RSRP differential value.
  • the base station is specifically configured to: notify the coordinated cell to the UE by using an RRC connection setup message or an RRC connection reconfiguration message.

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Abstract

本发明公开了一种基于多点协作CoMP的UE接入多小区的方法，包括：基站将携带UE上报测量小区最低门限的系统消息发送给UE；UE收到系统消息后，根据所述最低门限确定自身对应的服务小区和测量小区集合，并将测量小区集合上报给基站；基站与UE上报的测量小区进行信息交互，选出协作小区，并将选出的协作小区集合通知UE；UE收到通知并进行反馈后，加入CoMP。本发明还同时公开了一种基于多点协作CoMP的UE接入多小区的系统，运用该方法和系统可解决边缘UE在初始接入时不能加入CoMP的问题，进而可保证边缘UE初始接入时小区边缘的吞吐量。

Description

一种基于 CoMP的 UE接入多小区的方法和系统 技术领域
本发明涉及演进 LTE ( Long Term Evolution Advanced, LTE- Advanced ) 中的多点协作（ Coordinated Multi-Point, CoMP )技术， 尤其涉及一种基于 CoMP的用户设备 ( User Equipment, UE )接入多小区的方法和系统。 背景技术
LTE-Advanced作为第四代移动通信技术（4G )的候选技术方案， 其性 能指标在 LTE的基础上进一步增强， 系统支持最大 100MHz带宽， 支持的 下行峰值速率为 iGbit/s, 频谱效率已提高到 30bit/s/Hz; 上行峰值速率为 500Mbit/s, 频谱效率已提高到 15bit/s/Hz。 LTE-Advanced 的上述性能在小 区吞吐量、 尤其是小区边缘吞吐量上提出较高要求， 因此， LTE-Advanced 提出 CoMP的方法以达到改善小区边缘覆盖率，提高小区传输速率的目的。
所述 CoMP包括下行 CoMP发送和上行 CoMP接收。其中 ,上行 CoMP 接收通过多个小区对用户数据的联合接收来提高小区边缘用户吞吐量； 下 行 CoMP发送依据在多个协调点上是否都能获取业务数据， 可分为联合处 理 （ Joint Processing , JP ) 和协作调度 /波束赋形 （ Coordinated Scheduling/Beamforming , CS/CB)。 上行 CoMP接收主要利用联合处理的方 式获取传输增益， 通过协作来减小小区间干扰。
第三代合作伙伴计划 （ 3rd Generation Partnership Project, 3 GPP )将小 区定义为服务小区、 协作小区集合和测量小区集合。 服务小区是用来传输 物理下行控制信道（ Physical Downlink Control CHannel, PDCCH ) 的单个 小区； 协作小区集合是一组直接或者间接给 UE发送物理下行共享信道 ( Physical Downlink Shared CHannel, PDSCH )的小区集合， 这个集合可对 UE透明， 也可对 UE不透明； 测量小区集合是一组上报与 UE连接的信道 状态信息的小区集合。
目前， UE的协作小区集合和测量小区集合的确定， 都是在 UE初始接 入之后进行的，这样就会带来一个问题： 如果 UE初始接入时就处在小区的 边缘，如图 1所示，那么，所述 UE则只能在初始接入之后才能加入 CoMP, 并通过 CoMP技术改善小区边缘吞吐量， 导致 UE初始接入时小区的边缘 吞吐量成为瓶颈。 发明内容
有鉴于此， 本发明的主要目的在于提供一种基于 CoMP的 UE接入多 小区的方法和系统， 可解决边缘 UE在初始接入时不能加入 CoMP的问题， 进而可保证边缘 UE初始接入时小区边缘的吞吐量。
为解决上述技术问题， 本发明的技术方案是这样实现的：
本发明公开了一种基于多点协作 CoMP的用户设备 UE接入多小区的 方法， 包括：基站将携带 UE上报测量小区最低门限的系统消息发送给 UE; UE收到系统消息后，根据所述最低门限确定自身对应的服务小区和测量小 区集合， 并将测量小区集合上报给基站；基站与 UE上报的测量小区进行信 息交互， 选出协作小区， 并将选出的协作小区集合通知 UE; UE收到通知 并进行反馈后， 加入 CoMP。
其中， 所述门限定义为： 参考信号接收功率 RSRP测量值、 或者 RSRP 差分值， 所述 RSRP测量值为 RSRP的绝对值，所述 RSRP差分值为与服务 小区 RSRP测量值的差分值。
其中，所述 UE上报测量小区集合为： UE向基站发送无线资源控制 RRC 连接请求消息， 在 RRC连接请求消息中携带测量小区集合的相关信息， 包 括： 每个测量小区的小区 ID、 或小区 ID+RSRP测量值、 或小区 ID+RSRP 差分值，如果携带的是小区 ID+RSRP差分值，还需携带本服务小区的 RSRP 测量值。
其中， 所述基站选出协作小区为：
基站与 UE上报的测量小区进行信息交互，选出当前负荷轻的小区，直 接作为协作小区； 或者，
基站以 UE上报的 RSRP测量值、 或 RSRP差分值为依据， 与 UE上报 的所有测量小区进行信息交互， 选出协作小区； 或者，
基站根据 UE上报的信道质量指示 CQI/预编码矩阵指示 PMI/秩指示 RI 值以及 RSRP测量值、 或 RSRP差分值， 与 UE上报的所有测量小区进行信 息交互， 选出协作小区。
其中， 所述基站将选出的协作小区集合通知 UE为： 基站通过 RRC连 接建立消息或 RRC连接重配置消息将协作小区通知给 UE。
上述方案中， 所述 UE收到系统消息后， 该方法还包括： UE在小区搜 索过程中， 选择 RSRP 测量值最高的小区驻留， 同时存储不低于最低门限 的小区信息， 包括小区 ID及对应的 RSRP测量值、 或 RSRP差分值。
本发明还公开了一种基于 CoMP的 UE接入多小区的系统， 该系统包 括： 基站和 UE; 其中，
所述基站， 用于将携带 UE上报测量小区最低门限的系统消息发送给 UE, 并接收 UE上报的测量小区集合； 与 UE上报的测量小区进行信息交 互， 选出协作小区， 并将选出的协作小区集合通知 UE, 接收 UE的反馈； 所述 UE, 用于收到系统消息后， 根据所述最低门限确定自身对应的服 务小区和测量小区集合， 并将测量小区集合上报给基站； 收到基站通知的 协作小区集合后进行反馈， 并加入 CoMP。
其中， 所述 UE 收到系统消息后， 还用于： 在小区搜索过程中， 选择 RSRP测量值最高的小区驻留， 同时存储达到最低门限的小区信息， 包括小 区 ID及对应的 RSRP测量值、 或 RSRP差分值。 所述基站具体用于： 通过 RRC连接建立消息或 RRC连接重配置消息 将协作小区通知给 UE。
所述 UE具体用于： 向基站发送无线资源控制 RRC连接请求消息， 在 RRC连接请求消息中携带测量小区集合的相关信息， 包括： 每个测量小区 的小区 ID、 或小区 ID+RSRP测量值、 或小区 ID+RSRP差分值， 如果携带 的是小区 ID+RSRP差分值， 还携带服务小区的 RSRP测量值。
本发明提供的基于 CoMP的 UE接入多小区的方法和系统， 基站将携 带 UE上报测量小区最低门限的系统消息发送给 UE; UE收到系统消息后， 根据所述最低门限确定自身对应的服务小区和测量小区集合， 并将测量小 区集合上报给基站；基站与 UE上报的测量小区进行信息交互，选出协作小 区， 并将选出的协作小区集合通知 UE; UE收到通知并进行反馈后， 加入 CoMP。 本发明中， UE, 也就是边缘 UE在初始接入时最迟在 RRC连接重 配置消息后、 而最快在 RRC连接建立消息后即可参与 CoMP, 获得 CoMP 在小区边缘吞吐量上带来的增益，因此本发明可解决边缘 UE在初始接入时 不能加入 CoMP的问题， 保证了边缘 UE初始接入时 'J、区边缘的吞吐量。 附图说明
图 1为 UE初始接入时处于小区边缘的结构示意图；
图 2为本发明基于 CoMP的 UE接入多小区的方法实现流程示意图； 图 3为 UE在小区搜索过程中搜索到的所有小区结构示意图； 图 4为实施例一中方式一的 MAC CE的结构示意图；
图 5为实施例一中方式二的 MAC PDU子头部结构示意图；
图 6为实施例一中方式二的 MAC CE的结构示意图；
图 7为实施例一中方式三的 MAC CE的结构示意图。 具体实施方式
本发明的基本思想是:基站将携带 UE上报测量小区最低门限的系统消 息发送给 UE; UE收到系统消息后， 根据所述最低门限确定自身对应的服 务小区和测量小区集合，并将测量小区集合上报给基站；基站与 UE上报的 测量小区进行信息交互， 选出协作小区集合， 并将协作小区集合通知 UE; UE收到通知并进行反馈后 , 加入 CoMP。
其中， 本发明中所述 UE均为边缘 UE、 即位于小区边缘的 UE。
下面结合附图及具体实施例对本发明作进一步详细说明。
图 2为本发明基于 CoMP的 UE接入多小区的方法实现流程示意图， 如图 2所示， 该流程的实现步驟如下：
步驟 201 : 基站将携带 UE 上报测量小区最低门限的系统消息发送给
UE;
具体为： 基站向 UE发送系统消息， 系统消息中携带 UE向基站上报测 量小区的最低门限。 这里， 关于门限值的定义方式有两种： 第一种， 将门 限值定义为参考信号接收功率 （ Reference Signal Receiving Power, RSRP ) 的绝对值、 即 RSRP 测量值； 第二种， 将门限值定义为与服务小区 RSRP 测量值的差分值、 即 RSRP差分值。
现有技术中， 在 UE初始接入过程中， 基站不能获得 UE上报的测量小 区集合， 而测量小区集合是由基站决定的； 本发明中， 在 UE初始接入过程 中， 改由 UE主动上报测量小区集合， 上报的测量小区需满足最低门限， 这 个最低门限值由基站发送的系统消息携带。
步驟 202: UE收到系统消息后， 根据所述最低门限确定自身对应的服 务小区和测量小区集合；
具体为： 收到系统消息后， UE在小区搜索过程中， 选择 RSRP最高的 小区、 即服务小区驻留， 同时存储达到最低门限的小区信息， 包括小区 ID 及测量的 RSRP测量值、 或 RSRP差分值。
设图 3为 UE在小区搜索过程中搜索到的所有小区结构示意图，服务小 区和测量小区可按如下方法确定：
方法一： UE在小区搜索过程中， 搜索到小区 1至小区 9共九个小区， 按 其 RSRP 测 量 值 由 大 到 小 排 列 ， 依 次 为 RSRP1>RSRP5>RSRP6>RSRP3>RSRP4>RSRP9>RSRP2>RSRP7>RSRP8, 若最 低门限取为绝对门限 RSRPn^,且如果 RSRP^RSRP RSRP^RSRP^RSIO^ >RSRP9>RSRPmin>RSRP2>RSRP7>RSRP8 , 那么小区 1则为服务小区， 小区 5、 6、 3、 4、 9则为测量小区。
方法二： UE在小区搜索过程中， 搜索到小区 1至小区 9共九个小区， 按其 RSRP测量值由大到小排列， 依次为 RSRP^RSRP^RSRP^RSRP^ RSRP4>RSRP9>RSRP2>RSRP7>RSRP8 , 若最低门限取为差分门限
Figure imgf000008_0001
且如果 (RSRP厂 RSRP5)<(RSRP厂 RSRP6)<(RSRP厂 RSRP3)<(RSRP「RSRP4)< (RSRP -RSRP9)<RSRPmin, 那么小区 1为服务小区， 小区 5、 6、 3、 4、 9则 为测量小区。
这里， 最低门限的取值范围可限制为 4至 8个， 通过后台可以配置， 基站通知给 UE的是枚举值， UE可根据枚举值映射成相应的 dbm值。
现有技术中， 当 UE选择了 RSRP测量值最高的小区驻留后，会丟弃其 它搜索到的小区相关信息，而本发明 UE对搜索到的小区 RSRP测量值排序 后， 选择 RSRP测量值最高的小区驻留， 并存储不低于最低门限的小区 ID 和对应 RSRP测量值、或 RSRP差分值，然后丟弃其它搜索到的低于最低门 限的小区的相关信息。
步驟 203： UE将测量小区集合上报给基站；
具体为： UE向基站发送无线资源控制（RRC )连接请求消息， 在 RRC 连接请求消息中携带测量小区集合的相关信息， 包括： 每个测量小区的小 区 ID、 或小区 ID+RSRP测量值、 或小区 ID+RSRP差分值， 如果携带的是 小区 ID+RSRP差分值， 还需携带服务小区的 RSRP测量值。
当然，如果 UE在小区搜索过程中，没有搜索到不低于最低门限的小区， UE在发送 RRC连接请求消息时， 则不需携带测量小区相关信息。
UE 上报的测量小区集合携带在 MAC 控制信息单元 （MAC Control Element, MAC CE ) 里， 可使用预留的逻辑信道标识 （Logical Channel IDentify, LCID ) 来携带测量小区集合， 基站解析出 MAC 协议数据单元 ( PDU )的头部后，直接将测量小区相关信息上报给无线网络控制器（ Radio Network Controller, RNC )。
步驟 204: 基站与 UE上报的测量小区进行信息交互， 选出协作小区， 并将协作小区集合通知 UE;
具体为： 如果 UE竟争成功， 基站将与 RRC连接请求消息中携带的测 量小区进行信息交互， 选出协作小区， 并通过 RRC连接建立消息或 RRC 连接重配置消息将协作小区通知给 UE。
这里， 所述选出协作小区， 并将结果通知 UE的方式有如下三种： 方式一：基站与 UE上报的测量小区进行信息交互，选出当前负荷轻的 小区， 直接作为协作小区， 携带在 RRC连接建立消息中发送给 UE。
方式二： 基站以 UE上报的 RSRP测量值、 或 RSRP差分值为依据， 与 UE上报的所有测量小区进行信息交互， 选出协作小区， 通过 RRC连接建 立消息发送给 UE。
方式三： 基站根据 UE上 4艮的信道质量指示（ Channel Quality Indicator, CQI ) /预编码矩阵指示（Precoding Matrix Indicator, PMI ) /秩指示 （Rank Indication, RI )值、 以及 RSRP测量值、 或 RSRP差分值， 与 UE上报的所 有测量小区进行信息交互， 选出协作小区， 携带在 RRC连接重配置消息中 发送给 UE; 其中，基站在向 UE发送 RRC连接建立消息时，下发 CQI/PMI/RI配置， 在 RRC连接建立消息之后下发的 DCI0里将 CQI request置 1 , 触发 UE上 才艮非周期的 CQI/PMI/RI, 此时 UE不仅要上报服务小区的 CQI/PMI/RI, 也 要上报测量小区的 CQI/PMI/RI,基站在获得 UE上报的 CQI/PMI/RI信息之 后， 根据 CQI/PMI/RI和 RSRP测量值、 或 RSRP差分值与 UE上报的所有 测量小区进行信息交互， 选出协作小区， 携带在 RRC连接重配置消息中发 送给 UE。
上述三种方式中， 基站在与测量小区进行信息交互后， 具体如何选出 协作小区不在本发明的保护范围内。
步驟 205: UE收到通知并进行反馈后， 加入 CoMP;
具体为： UE收到基站的通知后， 发送对 RRC连接建立消息的 ACK反 馈， 基站收到 ACK反馈后， 令 UE直接进入 CoMP小区集， 获得 CoMP带 来的增益。
下面结合具体实施例对本发明作进一步详细描述。
实施例一
本实施例中具体介绍三种 UE上报测量小区集合的不同方式。
方式一： UE在 RRC连接请求消息的 MAC CE中仅携带测量小区的小 区 ID, MAC CE的结构如图 4所示。 其中， LCG ID取为协议中目前保留 的值， Cell lD表示小区 ID, 可用 14bit表示， 如果有多个小区 ID, 则需用 多个 MAC CE表示。
方式二： UE在 RRC连接请求消息的 MAC CE中携带测量小区的小区 ID及 RSRP测量值， MAC PDU子头部结构如图 5所示， MAC CE的结构 如图 6所示。 其中， 子头部中 LCID取值为协议中目前保留的值， L长度可 为 7bit, 即 MAC CE最长可为 128bytes; MAC CE由 Cell ID和 RSRP测量 值两部分组成， Cell lD可占用 9bit, RSRP测量值可占用 7bit。 方式三： UE在 RRC连接请求消息的 MAC CE中携带测量小区的小区 ID及 RSRP差分值， MAC PDU子头部与方式二中相同， MAC CE的结构 如图 7所示。其中， MAC CE由服务小区的 RSRP测量值、测量小区 Cell ID 和 RSRP差分值三部分组成， 服务小区的 RSRP测量值可用 8bit表示， 测 量小区 Cell ID可用 9bit表示， RSRP差分值可用 3bit表示， 其余 4bit则可 为保留位。
实施例二
本实施例中具体介绍步驟 204 中所述的基站选出协作小区， 并将选出 的协作小区通知给 UE的三种方法。
方法一：基站查看 UE通过 RRC连接请求消息上报的测量小区 ID,不 需要 RSRP测量值用于协作小区的选取，只是和 UE上报的所有测量小区进 行消息交互， 查看哪些测量小区有能力进行 CoMP, 就选为协作小区， 通过 RRC连接建立消息将选出的协作小区通知给 UE。 在 RRC连接建立消息中 可以不需通知具体的小区 ID, 而是通知小区 ID索引， 例如， 索引 0对应 RRC连接请求消息 MAC CE中的第一个小区 ID, 索引 1对应第二个小区 ID, 依次类推。
方法二： 基站将 UE通过 RRC连接请求消息携带的 RSRP测量值、 或 RSRP差分值作为测量信息用于协作小区的选取， 通过 RRC连接建立消息 将选出的协作小区通知 UE。 同样， 在 RRC连接建立消息中可以不需通知 具体的小区 ID, 而只是通知小区 ID 索引， 例如， 索引 0对应 RRC连接请 求消息 MAC CE中的第一个小区 ID, 索引 1对应第二个小区 ID, 依次类 推。
方法三： 基站将 UE上报的 CQI/PMI/RI以及 RSRP测量值、 或 RSRP 差分值一并作为测量信息用于协作小区的选取。 RRC连接建立消息里携带 CQI配置信息， 其中包括非周期配置和周期配置， 基站在发送 RRC连接建 立消息之后第一个发给 UE的 DCI0里将 CQI request置 1 , 触发 UE进行非 周期 CQI上报， 这时 UE不仅需要上报本服务小区的 CQI/PMI/RI, 也需要 上报测量小区的 CQI/PMI/RL
当基站收到 UE 上报的服务小区的 CQI/PMI/RI 和测量小区的 CQI/PMI/RI后， 和 UE之前上报的 RSRP测量值、 或 RSRP差分值一起， 用于协作小区的决策。 同样， 此时可以不需通知 UE具体的小区 ID, 而是 通知小区 ID 索引， 例如， 索引 0对应 RRC连接请求消息 MAC CE中的第 一个小区 ID, 索引 1对应第二个小区 ID, 依次类推。
为实现上述方法， 本发明还提供了一种基于 CoMP的 UE接入多小区 的系统， 包括： 基站和 UE; 其中，
所述基站， 用于将携带 UE 上报测量小区最低门限的系统消息发送给 UE, 并接收 UE上报的测量小区集合； 与 UE上报的测量小区进行信息交 互， 选出协作小区， 并将选出的协作小区集合通知 UE, 接收 UE的反馈； 所述 UE, 用于收到系统消息后， 根据所述最低门限确定自身对应的服 务小区和测量小区集合， 并将测量小区集合上报给基站； 收到基站通知的 协作小区集合后进行反馈， 并加入 CoMP。
所述 UE收到系统消息后，还用于在小区搜索过程中，选择 RSRP测量 值最高的小区、 即服务小区驻留， 同时存储不低于最低门限的小区信息， 包括小区 ID及对应的 RSRP测量值、 或 RSRP差分值。
UE具体用于： 向基站发送无线资源控制 RRC连接请求消息， 在 RRC 连接请求消息中携带测量小区集合的相关信息， 包括： 每个测量小区的小 区 ID、 或小区 ID+RSRP测量值、 或小区 ID+RSRP差分值， 如果携带的是 小区 ID+RSRP差分值， 还携带服务小区的 RSRP测量值。
基站具体用于： 通过 RRC连接建立消息或 RRC连接重配置消息将协 作小区通知给 UE。 以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

1、 一种基于多点协作 CoMP的用户设备 UE接入多小区的方法， 其特 征在于， 该方法包括：
基站将携带 UE上报测量小区最低门限的系统消息发送给 UE; UE收 到系统消息后， 根据所述最低门限确定自身对应的服务小区和测量小区集 合 , 并将测量小区集合上报给基站；
基站与 UE上报的测量小区进行信息交互，选出协作小区，并将选出的 协作 '〗、区集合通知 UE； UE收到通知并进行反馈后 , 加入 CoMP。
2、 根据权利要求 1所述的基于 CoMP的 UE接入多小区的方法， 其特 征在于， 所述门限定义为： 参考信号接收功率 RSRP 测量值、 或者 RSRP 差分值， 所述 RSRP测量值为 RSRP的绝对值，所述 RSRP差分值为与服务 小区 RSRP测量值的差分值。
3、 根据权利要求 1或 2所述的基于 CoMP的 UE接入多小区的方法， 其特征在于， 所述 UE上报测量小区集合为：
UE向基站发送无线资源控制 RRC连接请求消息，在 RRC连接请求消 息中携带测量小区集合的相关信息， 包括： 每个测量小区的小区 ID、 或小 区 ID+RSRP测量值、或小区 ID+RSRP差分值，如果携带的是小区 ID+RSRP 差分值， 还携带服务小区的 RSRP测量值。
4、 根据权利要求 1或 2所述的基于 CoMP的 UE接入多小区的方法， 其特征在于， 所述基站选出协作小区为：
基站与 UE上报的测量小区进行信息交互，选出当前负荷轻的小区，直 接作为协作小区； 或者，
基站以 UE上报的 RSRP测量值、 或 RSRP差分值为依据， 与 UE上报 的所有测量小区进行信息交互， 选出协作小区； 或者，
基站根据 UE上报的信道质量指示 CQI/预编码矩阵指示 PMI/秩指示 RI 值以及 RSRP测量值、 或 RSRP差分值， 与 UE上报的所有测量小区进行信 息交互， 选出协作小区。
5、 根据权利要求 1或 2所述的基于 CoMP的 UE接入多小区的方法， 其特征在于， 所述基站将选出的协作小区集合通知 UE为：
基站通过 RRC连接建立消息或 RRC连接重配置消息将协作小区通知 给 UE。
6、 根据权利要求 1或 2所述的基于 CoMP的 UE接入多小区的方法， 其特征在于， 所述 UE收到系统消息后， 该方法还包括：
UE在小区搜索过程中， 选择 RSRP测量值最高的小区驻留， 同时存储 不低于最低门限的小区信息，包括小区 ID及对应的 RSRP测量值、或 RSRP 差分值。
7、 一种基于 CoMP的 UE接入多小区的系统， 其特征在于， 该系统包 括： 基站和 UE; 其中，
所述基站， 用于将携带 UE上报测量小区最低门限的系统消息发送给 UE, 并接收 UE上报的测量小区集合； 与 UE上报的测量小区进行信息交 互， 选出协作小区， 并将选出的协作小区集合通知 UE, 接收 UE的反馈； 所述 UE, 用于收到系统消息后， 根据所述最低门限确定自身对应的服 务小区和测量小区集合， 并将测量小区集合上报给基站； 收到基站通知的 协作 '〗、区集合后进行反馈， 并加入 CoMP。
8、 根据权利要求 7所述的基于 CoMP的 UE接入多小区的系统， 其特 征在于，所述 UE收到系统消息后，还用于：在小区搜索过程中，选择 RSRP 测量值最高的小区驻留， 同时存储达到最低门限的小区信息， 包括小区 ID 及对应的 RSRP测量值、 或 RSRP差分值。
9、 根据权利要求 7或 8所述的基于 CoMP的 UE接入多小区的系统， 其特征在于， 所述基站具体用于： 通过 RRC连接建立消息或 RRC连接重 配置消息将协作小区通知给 UE。
10、 根据权利要求 7或 8所述的基于 CoMP的 UE接入多小区的系统， 其特征在于， 所述 UE具体用于： 向基站发送无线资源控制 RRC连接请求 消息， 在 RRC连接请求消息中携带测量小区集合的相关信息， 包括： 每个 测量小区的小区 ID、 或小区 ID+RSRP测量值、 或小区 ID+RSRP差分值， 如果携带的是小区 ID+RSRP差分值， 还携带服务小区的 RSRP测量值。
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