WO2010118618A1 - 基站间切换方法 - Google Patents

基站间切换方法 Download PDF

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Publication number
WO2010118618A1
WO2010118618A1 PCT/CN2009/075907 CN2009075907W WO2010118618A1 WO 2010118618 A1 WO2010118618 A1 WO 2010118618A1 CN 2009075907 W CN2009075907 W CN 2009075907W WO 2010118618 A1 WO2010118618 A1 WO 2010118618A1
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WO
WIPO (PCT)
Prior art keywords
base station
frequency point
point information
component carrier
random access
Prior art date
Application number
PCT/CN2009/075907
Other languages
English (en)
French (fr)
Inventor
高音
喻斌
郝鹏
朱鹏
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP09843252.9A priority Critical patent/EP2403295B1/en
Priority to BRPI0924835-8A priority patent/BRPI0924835B1/pt
Priority to ES09843252.9T priority patent/ES2614918T3/es
Priority to US13/258,130 priority patent/US8594047B2/en
Priority to JP2012501116A priority patent/JP5395949B2/ja
Priority to KR1020117022987A priority patent/KR101299146B1/ko
Priority to MX2011010365A priority patent/MX2011010365A/es
Publication of WO2010118618A1 publication Critical patent/WO2010118618A1/zh

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Classifications

    • 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
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access 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
    • H04W36/0055—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
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to the field of communications, and in particular, to an inter-base station handover method. Background technique
  • a Long Term Evolution (LTE) network is an evolved universal mobile communication system (E-UTRAN, Evolved Universal Terrestrial Radio Access Network) base station (eNB, Evolved NodeB) and an evolved packet
  • the exchange center (EPC, Evolved Packet Core) is composed of a network that tends to be flat.
  • the E-UTRAN includes a set of eNBs connected to the EPC through the S1 interface, and the eNBs can be connected through the X2 interface. It should be noted that the S1 and the X2 are logical interfaces, and one EPC can manage one or more eNBs.
  • One eNB may also be controlled by multiple EPCs, and one eNB may manage one or more cells.
  • the evolved LTE (LTE-A, LTE-Advanced) system is a next-generation evolution system of the LTE system.
  • the LTE-A system uses carrier aggregation technology to extend the transmission bandwidth.
  • Each aggregated carrier is called a component carrier.
  • the component carrier has component carrier #1 and component carrier. #2, component carrier #3, where the fill slash is component carrier #1, the fill grid is component carrier #2, the fill vertical line is component carrier #3, each component carrier includes multiple subcarriers, and the component carrier is in the spectrum.
  • the above may be continuous or non-contiguous, that is, the component carrier interval may be zero.
  • the downlink transmission bandwidth of the LTE-A system is aggregated by multiple downlink component carriers; the uplink transmission bandwidth may include only one uplink component carrier, or may be aggregated by multiple uplink component carriers, that is, the system uplink and downlink bandwidth may include A different number of component carriers. Even if the number of uplink component carriers and downlink component carriers is the same, For the terminal, the number of component carriers included in the downlink receiving bandwidth may be different from the number of component carriers included in the uplink transmission bandwidth.
  • the downlink transmission bandwidth includes five downlink component carriers, which are component carrier #1 to component carrier #5; and the uplink transmission bandwidth includes only two uplink component carriers, which are component carrier 1 and component carrier 2;
  • the diagonal line represents the synchronization channel, the vertical line represents the broadcast channel of the downlink component carriers #1, #2, #3, the grid represents the broadcast channel of the downlink component carriers #4, #5; and the downlink component carriers #1, #2
  • the system information in the broadcast channel of #3 includes the frequency position and bandwidth of the uplink component carrier 1
  • the system information in the broadcast channel of the downlink component carriers #4, #5 includes the frequency position and bandwidth of the uplink component carrier 2.
  • the unequal number of uplink component carriers and downlink component carriers may be referred to as asymmetric carrier aggregation.
  • the source serving cell uses the handover command to obtain the broadcast related part information acquired from the target cell, the target cell as the dedicated resource information allocated by the terminal, and the target cell.
  • Information such as uplink and downlink frequency points and bandwidth is notified to the terminal.
  • the information contained in the transparent packet of the handover request of the source base station to the target base station includes the AS, the key, the RRM configuration information, and the like, and the transparent packet in the handover preparation completion message includes the target.
  • the information related to the cell broadcast, the dedicated resource information allocated by the target cell to the handover terminal, the uplink and downlink frequency point information of the target cell, and the bandwidth, etc. because the LTE system is a single carrier system, the transparent packet includes only a pair of target cells. Up and down single-frequency point information. If the information is default, all frequency information of the target cell is considered to be the same as all frequency information of the current cell.
  • a non-contention based random access procedure is generally adopted, including the following processing:
  • Step 1 In the handover command, notify the terminal to switch the dedicated random access resource, including the designated random access channel (Random Access Channel, called RACH) and before random access a random access preamble, the terminal sends a designated random access preamble, that is, a random access request, on a designated random access channel of the target cell;
  • RACH Random Access Channel
  • Step 2 After receiving the random access preamble sent by the terminal, the target cell sends a random access response in the downlink.
  • Step 3 After transmitting the preamble, the terminal receives the random access response sent by the target cell in the specified search window, completes the random access process, and further completes the handover.
  • both uplink and downlink bandwidths may include multiple component carrier frequency information
  • the handover command transmits frequency information of all component carriers of the target cell to the terminal, but when the target cell includes
  • the terminal cannot determine which frequency point should be used to initiate a random access request. If there is no specific agreement between the terminal and the base station, random connection may occur. Incoming resource waste or random access conflicts.
  • the present invention has been made in view of the problem that the handover of the multi-carrier LTE-A system in the related art has a component carrier in which the terminal is not sure of the random access request.
  • the main object of the present invention is to provide an inter-base station handover method, Solve the above problems in the related art.
  • an inter-base station handover method for switching a terminal from a source cell of a source base station to a target cell of a target base station.
  • the method for switching between base stations provided by the present invention includes:
  • the target base station sends, by the source base station, a handover preparation completion message carrying the handover reference frequency point information to the terminal, where the handover reference frequency point information includes a center of the uplink component carrier used for the terminal to initiate the random access request.
  • Frequency point information includes a center of the uplink component carrier used for the terminal to initiate the random access request.
  • the terminal performs a random access request according to the central frequency point information of the uplink component carrier.
  • the switching reference frequency point information further includes: center frequency point information of a downlink component carrier used by the target cell of the target base station to send a random access response.
  • the method further includes: receiving, by the terminal, the random access response sent by the target base station according to the central frequency point information of the downlink component carrier.
  • the handover preparation completion message further carries frequency point and bandwidth information of all component carriers of the target cell of the target base station.
  • the handover reference frequency point information is carried in the mobile control information of the transparent packet of the handover preparation completion message.
  • the method before the terminal receives the handover preparation completion message, the method further includes:
  • the source base station sends the handover preparation completion message by using the S1/X2 interface; where, when the source base station sends the handover preparation completion message by using the X2 interface, the handover preparation completion message is carried in a predetermined message. All service cell information is sent;
  • the predetermined message includes one of the following: an X2 interface setup message, an X2 interface setup response message, and a base station configuration update message.
  • the processing by the source base station to send the handover preparation complete message through the S1 interface includes:
  • the mobility management entity transparently transmits the transparent packet to the source base station by a handover command message.
  • the present invention provides an inter-base station handover method, where the method includes a source base station and a target base station;
  • the target base station sequentially arranges the central frequency point information of the uplink component carrier of the target cell to obtain a first list: the central frequency point information of the first uplink component carrier in the first list is used by the terminal to initiate a random access request. Central frequency point information of the uplink component carrier; Transmitting, by the source base station, the handover preparation completion message carrying the first list to the terminal by using the source base station;
  • the terminal performs a random access request according to the central frequency point information of the first uplink component carrier.
  • the method further includes:
  • the source base station sequentially arranges the center frequency point information of the downlink component carrier of the target cell to obtain a second list: the center frequency point information of the first downlink component carrier in the second list is used by the target cell The center frequency point information of the downlink component carrier for transmitting the random access response.
  • the method further includes: in the foregoing solution, the terminal receives the random connection sent by the target base station according to the central frequency point information of the first downlink component carrier. In response.
  • the problem that the handover of the multi-carrier LTE-A system in the related art exists is uncertain for the component carrier that performs the random access request, It can effectively improve the utilization of random access resources by the target base station and reduce random access conflicts.
  • FIG. 1 is a schematic diagram of carrier aggregation of an LTE-A system in the related art
  • FIG. 2 is a schematic diagram of a plurality of downlink component carriers corresponding to one downlink component carrier in an LTE-A system in the related art
  • 3 is a flowchart of a method for switching between base stations according to Embodiment 1 of the method of the present invention
  • 4 is a signaling flow diagram of Example 1 according to an embodiment of the present invention.
  • FIG. 5 is a signaling flowchart of Example 2 according to an embodiment of the present invention.
  • the present invention provides an inter-base station handover method.
  • the target base station needs to send the frequency and bandwidth information of all the component carriers of the target cell to the source base station, and also needs to send the switching reference frequency point information of the target cell to the source base station, where the foregoing switching reference is used.
  • the frequency point information includes uplink component carrier center frequency information for initiating a random access request specified by the target cell for the current terminal to be handed over; after receiving the information, the source base station may use the air interface message to send the information to the current need.
  • the terminal may perform the random access request by using the uplink component carrier information specified in the handover reference frequency point information.
  • an inter-base station handover method for switching a terminal from a source cell of a source base station to a target cell of a target base station.
  • FIG. 3 is a flowchart of a method for switching between base stations according to Embodiment 1 of the method according to the present invention. As shown in FIG. 3, the following processing is included (step S302 - step S304): Step S302: The target base station sends, by using the source base station, a handover preparation completion message carrying the handover reference frequency point information to the terminal;
  • the target base station sends, by using the source base station, a handover preparation completion message that carries the switching reference frequency point information and the frequency and bandwidth information of all component carriers of the target cell, where the switching reference frequency point information includes:
  • the central frequency point information of the uplink component carrier used to initiate the random access request may be randomly selected, or may be an uplink component carrier with a relatively small load; in practical applications, the target base station may pass the S1/X2 interface.
  • the foregoing handover preparation completion message is sent, so that the reference frequency point information for transmitting the random access request specified by the target cell of the target base station is transmitted to the source cell of the source base station.
  • the handover reference frequency point information may further include a central frequency point information of the downlink component carrier used by the specified target cell (target base station) for transmitting the random access response, where the designation may be randomly selected by the target cell, It is also possible to select a downlink component carrier with a relatively small load.
  • the target base station sends a random access response corresponding to the random access request to be initiated by the terminal on the downlink component carrier, so that the terminal can receive the random access response on the designated downlink component carrier.
  • the foregoing manner can establish a correspondence between the uplink component carrier of the random access request and the downlink component carrier of the random access response, and prevent the target base station from transmitting random on all downlink component carriers because it does not confirm which downlink component carrier the terminal will listen to. Waste of resources caused by access response.
  • the handover reference frequency point information may be carried in the mobile control information of the transparent packet of the target base station to the source base station of the handover preparation completion message.
  • Table 1 shows the structure of the mobile control information carrying the handover reference frequency point information.
  • the mobility control information includes: a target cell global ID, target cell frequency point information, target cell bandwidth information, and a target cell handover reference. Frequency information, other mobile control related information. Table 1
  • Step S304 The terminal performs a random access request according to the central frequency point information of the uplink component carrier. Specifically, the terminal sends a random access request on the component carrier indicated by the central frequency point information of the uplink component carrier.
  • the terminal receives the random access response sent by the target base station according to the central frequency point information of the downlink component carrier, that is, receives the random access on the component carrier indicated by the central frequency point information of the downlink component carrier. response.
  • the X2 interface common process such as an X2 interface setup message, an X2 interface setup response message, and a base station configuration update message, may be carried in all the serving cell information managed by the base station in the messages. All uplink and downlink frequency and bandwidth information.
  • Example 1 The target base station sends a handover preparation complete message through the X2 interface.
  • FIG. 4 is a signaling flowchart of Example 1 according to an embodiment of the present invention. As shown in FIG. 4, the following processing is included: Step 1: The source base station sends a handover request message (HANDOVER REQUEST) to the target base station through the X2 interface.
  • HANDOVER REQUEST a handover request message
  • Step 2 After receiving the handover request message, the target base station constructs a handover preparation complete message (HANDOVER REQUEST ACKNOWLEDGE) and sends it to the source base station. Specifically, when the target base station constructs the handover preparation completion message, the target base station to the source in the message
  • the target eNB To Source eNB Transparent Container carries the handover reference frequency point information specified by the target cell.
  • the handover reference frequency point information may be added in the mobility control information (MobilityControlInformation) of the transparent packet, and the mobile control is performed.
  • the specific structure of the information can be referred to Table 1.
  • the handover reference frequency point information may include central frequency point information of the uplink component carrier used to initiate the random access request specified by the target cell for the current terminal handover; preferably, the target cell designation may also be included Sending the center frequency information of the downlink component carrier of the random access response.
  • the target base station may also transmit the frequency and bandwidth information of all component carriers of the target cell to the source base station. In actual applications, if the frequency and bandwidth information of all component carriers default, all component carrier frequencies of the target cell are considered to be The point and bandwidth information is the same as all component carrier frequency and bandwidth information of the current cell.
  • Step 3 The source base station receives the handover preparation completion message sent by the target base station, and sends the information to the terminal by using an air interface message, where the terminal receives the handover reference frequency point information in the message and the random access configuration information related to the component carrier. After that, the random access procedure is performed on the specified time-frequency domain resource, and the random access response message is read on the designated downlink component carrier.
  • the base station sends a handover preparation complete message carrying the handover reference frequency information through the X2 interface, so that the terminal can send a random access request on the designated uplink component carrier, and receive random access on the specified downlink component carrier. response.
  • Example 2 The target base station sends a handover preparation complete message through the S1 interface.
  • FIG. 5 is a signaling flowchart of Example 2, as shown in FIG. 5, according to an embodiment of the present invention, including Processing as follows:
  • Step 1 The source base station sends a handover request message (HANDOVER REQUIRED) to the mobility management entity (MME, Mobility Management Entity) through the S1 interface.
  • MME Mobility Management Entity
  • Step 2 The MME receives the handover request message (HANDOVER REQUIRED), and sends a handover request message (HANDOVER REQUEST) to the target base station after performing handover resource processing;
  • Step 3 The target base station receives a handover request message (HANDOVER REQUEST), and constructs a handover preparation complete message (HANDOVER REQUEST ACKNOWLEDGE), and sends a handover preparation completion message to the MME.
  • a handover request message HANDOVER REQUEST
  • a handover preparation complete message HANDOVER REQUEST ACKNOWLEDGE
  • the target eNB to the source base station transparent container carries the handover reference frequency point information specified by the target cell.
  • the handover reference frequency point can be added in the mobility control information (Mobility Control Information). information.
  • the handover reference frequency point information may include uplink component carrier center frequency information for initiating a random access request that is specified by the target cell for the current terminal to be used for handover; preferably, the target cell may be configured to be used for sending The center frequency point information of the downlink component carrier of the random access response.
  • the target base station may also transmit the frequency and bandwidth information of all component carriers of the target cell to the source base station by using the MME. If the frequency and bandwidth information of all component carriers of the target cell default, then all component carrier frequencies of the target cell are considered to be The point and bandwidth information is the same as all component carrier frequency and bandwidth information of the current cell.
  • Step 4 After receiving the message, the MME transparently transmits the content in the transparent packet to the source base station by using a handover command message (HANDOVER COMMAND).
  • HANDOVER COMMAND a handover command message
  • Step 5 After receiving the handover command message, the source base station sends the information to the terminal by using an air interface message, and the terminal acquires reference frequency point information in the message and random access related to the component carrier. After the configuration information, the random access procedure is initiated on the specified time-frequency domain resource, and the random access response message is read on the specified downlink component carrier.
  • the base station sends a handover preparation complete message carrying the handover reference frequency information through the S1 interface, so that the terminal can send a random access request on the designated uplink component carrier, and receive random access on the specified downlink component carrier. response.
  • FIG. 6 is a flowchart of a method for switching between base stations according to Embodiment 2 of the method according to the present invention. As shown in FIG. 6, the following processing is included (step S602 - step S606):
  • Step S602 The target base station sequentially arranges the central frequency point information of the uplink component carrier of the target cell to obtain a first list.
  • the target base station sequentially aligns the center frequency information of the uplink component carrier of the target cell to obtain a first list, where the center frequency information of the first uplink component carrier in the first list is used by the terminal to initiate random connection.
  • the central frequency point information of the uplink component carrier of the request is received; in step S602, the source base station may further sequentially arrange the center frequency point information of the downlink component carrier of the target cell to obtain a second list, where the second list is
  • the center frequency point information of the first downlink component carrier is the center frequency point information of the downlink component carrier used by the target cell to send the random access response.
  • Step S604 The target base station sends, by using the source base station, a handover preparation completion message carrying the first list to the terminal.
  • the handover preparation completion message may further carry a second list.
  • the foregoing information (the first list and the second list) may be carried in the mobility control information, and the table 2 shows that the first list is carried.
  • the structure of the second list of mobile control information as shown in Table 2, including the target cell global ID, the target cell frequency point information, the target cell bandwidth information, and other mobile controls Related Information.
  • first list and the second list may also be set together.
  • Step S606 The terminal performs a random access request according to the central frequency point information of the first uplink component carrier in the first list.
  • the terminal receives the random access response sent by the target base station according to the central frequency point information of the first downlink component carrier.
  • Step 1 Whether the handover is performed through the S1 interface or the X2 interface, the target base station transmits, to the source base station, a sequence list including all target cell uplink component carrier frequency information and downlink component carrier frequency information, and the target base station expects
  • the switching reference frequency point information is used as the first uplink component carrier frequency point and the first downlink component carrier frequency point writing sequence list, and specifies the first uplink component carrier frequency point in the sequence list received by the source base station by default.
  • the first downlink component carrier frequency is the switching reference frequency point.
  • the sequence list including all target cell uplink component carrier frequency information and downlink component carrier frequency information may be carried in the mobile control information in the target eNB To Source eNB Transparent Container.
  • the foregoing sequence list cannot be empty, that is, the corresponding frequency point information in the sequence table of the reference frequency point information by default cannot be defaulted.
  • Step 2 After receiving the handover complete message, the source base station sends the information to the terminal through the air interface message, and the terminal acquires the reference frequency point information in the message and the random access configuration information related to the component carrier, and then at the specified time frequency. A random access procedure is initiated on the domain resource, and the random access response message is read on the designated downlink component carrier.
  • the handover of the multi-carrier LTE-A system in the related art is solved, and the terminal is uncertain to perform the random access request.
  • the problem of component carriers can effectively improve the utilization of random access resources by the target base station and reduce random access conflicts.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

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Description

基站间切换方法 技术领域
本发明涉及通信领域， 并且特别地， 涉及一种基站间切换方法。 背景技术
在相关技术中， 长期演进（ LTE , Long Term Evolution ) 网络由演进的 通用移动通信系统陆地无线接入网（ E-UTRAN, Evolved Universal Terrestrial Radio Access Network ) 的基站 （ eNB , Evolved NodeB )和演进分组交换中 心 （EPC, Evolved Packet Core )组成， 其特点是网络趋于扁平化。 其中， E-UTRAN包含和 EPC通过 S1接口连接的 eNB的集合， eNB之间能够通 过 X2接口连接， 需要说明的是， Sl、 X2是逻辑接口， 并且， 一个 EPC可 以管理一个或多个 eNB ,—个 eNB也可以受控于多个 EPC,—个 eNB可以 管理一个或多个小区。
演进的 LTE ( LTE-A, LTE- Advanced ) 系统是 LTE系统的下一代演进 系统。 LTE-A系统采用载波聚集（ carrier aggregation )技术扩展传输带宽， 每个聚集的载波称为一个分量载波（component carrier ), 如图 1所示， 可以 看到分量载波有分量载波 #1、 分量载波 #2、 分量载波 #3 , 其中填充斜线为 分量载波 #1 , 填充网格为分量载波 #2, 填充竖线为分量载波 #3 , 每个分量 载波都包括多个子载波， 分量载波在频谱上可以是连续的， 也可以是非连 续的， 即分量载波间隔可以为 0。 LTE-A系统的下行传输带宽由多个下行分 量载波聚集而成； 上行传输带宽可能只包含一个上行分量载波， 也可能由 多个上行分量载波聚集而成， 即， 系统上行和下行带宽可能包含不同数目 的分量载波。 即使系统上行分量载波和下行分量载波的数目相同， 对某个 终端而言， 其下行接收带宽包含的分量载波数同上行发送带宽包含的分量 载波数也可能不同。
如图 2所示， 下行传输带宽包含五个下行分量载波， 为分量载波 #1~分 量载波 #5; 上行传输带宽只包含两个上行分量载波， 为分量载波 1 和分量 载波 2; 图 2 中， 斜线代表同步信道， 竖线代表下行分量载波 #1、 #2、 #3 的广播信道， 网格代表下行分量载波 #4、 #5的广播信道； 而且下行分量载 波 #1、 #2、 #3的广播信道中的系统信息包括上行分量载波 1的频点位置及 带宽， 下行分量载波 #4、 #5 的广播信道中的系统信息包括上行分量载波 2 的频点位置及带宽。 在相关技术中， 上行分量载波和下行分量载波数目不 等可以称为非对称载波聚集。
在 LTE系统中， 当终端（ UE, User Equipment )在小区间进行切换时， 源服务小区通过切换命令把从目标小区获取的广播相关部分信息、 目标小 区为终端分配的专用资源信息、 目标小区的上下行频点及带宽等信息通知 给终端。
对于基站间 （ inter-NodeB ) 的小区切换， 源基站给目标基站的切换请 求的透明包中包含的信息包括 AS、 密钥、 RRM配置信息等， 而在切换准 备完成消息的透明包中包含目标小区广播相关部分信息、 目标小区为切换 终端分配的专用资源信息、 目标小区的上下行频点信息及带宽等信息， 因 为 LTE系统是一个单载波系统， 所以透明包中只包含目标小区的一对上、 下行单频点信息， 如果该信息缺省， 则认为目标小区的所有频点信息和当 前小区的所有频点信息相同。 在 LTE系统的切换中， 一般采用基于非竟争 的随机接入过程 ( Non-contention based Random Access Procedure ), 包括以 下处理：
步骤 1 , 在切换命令中通知该终端切换的专用随机接入资源， 包含指定 的随机接入信道（Random Access Channel, 筒称为 RACH )和随机接入前 导（ Random Access Preamble ), 终端在目标小区的指定随机接入信道上发 送指定的随机接入前导， 即， 随机接入请求；
步骤 2, 目标小区接收到终端发送的随机接入前导后， 在下行发送一个 随机接入响应；
步骤 3 , 终端在发送完前导后， 在指定的搜索窗口内收到目标小区发送 过来的随机接入响应， 完成随机接入过程， 并进一步完成切换。
而在多载波的 LTE-A系统中， 上行和下行带宽都可以包含多个分量载 波频点信息， 切换命令会把目标小区的所有分量载波的频点信息传递给终 端， 但是， 当目标小区包含多个上行频点且多个频点上都有随机接入资源 时， 终端不能确定哪个频点应该用于发起随机接入请求， 如果终端和基站 之间没有特定的约定， 可能会造成随机接入资源浪费或者随机接入沖突等 问题。 发明内容
考虑到相关技术中多载波 LTE-A系统的切换存在终端不确定进行随机 接入请求的分量载波的问题而提出本发明， 为此， 本发明的主要目的在于 提供一种基站间切换方法， 以解决相关技术中存在的上述问题。
为了实现上述目的， 根据本发明的一个方面， 提供了一种基站间切换 方法， 用于将终端由源基站的源小区切换到目标基站的目标小区。
本发明提供的一种基站间切换方法， 所述方法包括：
目标基站通过源基站向终端发送携带有切换参考频点信息的切换准备 完成消息； 其中， 所述切换参考频点信息包括为所述终端指定的用于发起 随机接入请求的上行分量载波的中心频点信息；
所述终端根据所述上行分量载波的中心频点信息进行随机接入请求。 上述方案中， 所述切换参考频点信息还包括： 所述目标基站的目标小 区用于发送随机接入响应的下行分量载波的中心频点信息。 上述方案中， 所述终端进行随机接入请求之后， 所述方法还包括： 所述终端根据所述下行分量载波的中心频点信息， 接收所述目标基站 发送的随机接入响应。
上述方案中， 所述切换准备完成消息中还携带有所述目标基站的目标 小区的全部分量载波的频点和带宽信息。
上述方案中， 所述切换参考频点信息携带在所述切换准备完成消息的 透明包的移动控制信息中。
上述方案中， 所述终端接收所述切换准备完成消息之前， 所述方法还 包括：
所述源基站通过 S1/X2接口发送所述切换准备完成消息； 其中， 在所 述源基站通过所述 X2接口发送所述切换准备完成消息时，将所述切换准备 完成消息携带在预定消息中所有服务小区信息上进行发送；
所述预定消息包括以下之一： X2接口建立消息、 X2接口建立响应消 息、 基站配置更新消息。
上述方案中， 所述源基站通过 S1接口发送所述切换准备完成消息的处 理包括：
所述源基站通过 S1接口将所述切换准备完成消息的透明包发送到移动 管理实体；
所述移动管理实体通过切换命令消息将所述透明包透传到所述源基 站。
本发明提供的一种基站间切换方法， 所述方法包括源基站和目标基站； 其中，
目标基站将目标小区的上行分量载波的中心频点信息进行顺序排列得 到第一列表： 所述第一列表中的第一个上行分量载波的中心频点信息为终 端用于发起随机接入请求的上行分量载波的中心频点信息； 所述目标基站通过源基站向所述终端发送携带有所述第一列表的切换 准备完成消息；
所述终端根据所述第一个上行分量载波的中心频点信息进行随机接入 请求。
上述方案中， 所述方法进一步包括：
所述源基站将所述目标小区的下行分量载波的中心频点信息进行顺序 排列得到第二列表： 所述第二列表中的第一个下行分量载波的中心频点信 息为所述目标小区用于发送随机接入响应的下行分量载波的中心频点信 息。
上述方案中， 所述终端进行随机接入请求之后， 所述方法还包括： 上述方案中， 所述终端根据所述第一个下行分量载波的中心频点信息 接收所述目标基站发送的随机接入响应。
借助于本发明的技术方案， 通过在切换准备完成消息中增加切换参考 频点信息， 解决了相关技术中多载波 LTE-A系统的切换存在终端不确定进 行随机接入请求的分量载波的问题， 可以有效提高目标基站对随机接入资 源的利用率， 减少随机接入沖突。
本发明的其它特征和优点将在随后的说明书中阐述， 并且， 部分地从 说明书中变得显而易见， 或者通过实施本发明而了解。 本发明的目的和其 他优点可通过在所写的说明书、 权利要求书、 以及附图中所特别指出的结 构来实现和获得。 附图说明
图 1是相关技术中 LTE-A系统的载波聚集示意图；
图 2是相关技术中 LTE-A系统中多个下行分量载波对应一个下行分量 载波的示意图；
图 3是根据本发明方法实施例一的基站间切换方法的流程图； 图 4是根据本发明实施例的实例 1的信令流程图
图 5是根据本发明实施例的实例 2的信令流程图
图 6是根据本发明方法实施例二的基站间切换方法的流程图。 具体实施方式 在多载波系统的切换中， 存在终端不确定在哪个分量载波中发送随机 接入请求的问题， 为此， 本发明提供了一种基站间切换方法， 在 LTE-A系 统中， 当终端需要在基站间进行切换时， 目标基站除了向源基站发送目标 小区的所有分量载波的频点和带宽信息外， 还需要向源基站发送目标小区 的切换参考频点信息， 其中， 上述切换参考频点信息包括目标小区为当前 终端进行切换所指定的用于发起随机接入请求的上行分量载波中心频点信 息； 当源基站收到该信息后， 可以利用空口消息将该信息发送到当前需要 切换的终端， 终端可以利用上述切换参考频点信息中指定的上行分量载波 信息进行随机接入请求。
以下结合附图对本发明的优选实施例进行说明， 应当理解， 此处所描 述的优选实施例仅用于说明和解释本发明， 并不用于限定本发明。
在以下的描述中， 为了解释的目的， 描述了多个特定的细节， 以提供 对本发明的透彻理解。 然而， 艮显然， 在没有这些特定细节的情况下， 也 可以实现本发明， 此外， 在不背离所附权利要求阐明的精神和范围的情况 方法实施例一
根据本发明的实施例， 提供了一种基站间切换方法， 用于将终端由源 基站的源小区切换到目标基站的目标小区。 图 3是根据本发明方法实施例 一的基站间切换方法的流程图， 如图 3所示， 包括如下处理（步骤 S302 - 步骤 S304 ): 步骤 S302: 目标基站通过源基站向终端发送携带有切换参考频点信息 的切换准备完成消息；
具体的， 目标基站通过源基站向终端发送携带有切换参考频点信息、 以及目标小区的全部分量载波的频点和带宽信息的切换准备完成消息， 其 中， 切换参考频点信息包括： 为终端指定的用于发起随机接入请求的上行 分量载波的中心频点信息， 可以是随机选择的， 也可以是选择负荷相对较 小的上行分量载波； 在实际应用中， 目标基站可以通过 S1/X2接口发送上 述切换准备完成消息， 从而将目标基站的目标小区指定的用于终端切换过 程中发送随机接入请求的参考频点信息传递给源基站的源小区。
优选地， 切换参考频点信息中还可以包括指定的目标小区 （目标基站） 用于发送随机接入响应的下行分量载波的中心频点信息， 其中， 所述指定 可以是目标小区随机选择的， 也可以是选择负荷相对较小的下行分量载波。 目标基站会在该下行分量载波上发送与终端将发起的随机接入请求对应的 随机接入响应， 使得终端可以在该指定的下行分量载波上接收随机接入响 应。 上述方式能够建立随机接入请求的上行分量载波和随机接入响应的下 行分量载波的对应关系， 避免目标基站因为不确认终端会监听哪个下行分 量载波， 而在所有的下行分量载波上都发送随机接入响应造成的资源浪费。
需要说明的是， 在本发明的实施例中， 切换参考频点信息可以携带在 切换准备完成消息的目标基站到源基站的透明包的移动控制信息中。 表 1 示出了携带有切换参考频点信息的移动控制信息的结构， 如表 1 所示， 移 动控制信息包括： 目标小区全局 ID、 目标小区频点信息、 目标小区带宽信 息、 目标小区切换参考频点信息、 其他移动控制相关信息。 表 1
Figure imgf000009_0001
步骤 S304:终端根据上行分量载波的中心频点信息进行随机接入请求； 具体的， 终端在上行分量载波的中心频点信息所指示的分量载波上发 送随机接入请求；
优选地， 终端在进行随机接入请求之后， 根据下行分量载波的中心频 点信息接收目标基站发送的随机接入响应， 即在下行分量载波的中心频点 信息指示的分量载波上接收随机接入响应。
此外， 在 LTE- A系统中， 可以通过 X2接口公共流程， 例如 X2接口建 立消息、 X2接口建立响应消息、 基站配置更新消息， 在这些消息中的基站 所管辖的所有服务小区信息中携带服务小区的所有上、 下行频点和带宽信 息。
下面结合附图， 对上述技术方案进行详细的说明。
实例 1 , 目标基站通过 X2接口发送切换准备完成消息。
图 4是根据本发明实施例的实例 1的信令流程图， 如图 4所示， 包括 如下处理： 步骤 1 , 源基站通过 X2 接口向目标基站发送切换请求消息 ( HANDOVER REQUEST );
步骤 2 , 目标基站接收到切换请求消息后， 构造切换准备完成消息 ( HANDOVER REQUEST ACKNOWLEDGE ) 并发送给源基站， 具体地， 目标基站在构造切换准备完成消息时， 在该消息中的目标基站到源基站的 透明包（ Target eNB To Source eNB Transparent Container ) 中携带目标小区 指定的切换参考频点信息， 优选地， 可以在透明包的移动控制信息 ( MobilityControlInformation ) 中增加该切换参考频点信息， 移动控制信息 的具体结构可以参照表 1。
具体地， 切换参考频点信息中可以包含目标小区为当前终端作切换所 指定的用于发起随机接入请求的上行分量载波的中心频点信息； 优选地， 还可包含目标小区指定的用于发送随机接入响应的下行分量载波的中心频 点信息。 此外， 目标基站还可以向源基站传递目标小区的所有分量载波的 频点和带宽信息， 在实际应用中， 如果所有分量载波的频点和带宽信息缺 省， 则认为目标小区的所有分量载波频点和带宽信息与当前小区的所有分 量载波频点和带宽信息相同。
步骤 3, 源基站接收目标基站发送的切换准备完成消息， 并通过空口消 息将该信息发送给终端， 终端收到该消息中的切换参考频点信息及与该分 量载波相关的随机接入配置信息后， 在指定的时频域资源上进行随机接入 过程， 并在指定的下行分量载波读取随机接入响应消息。
通过上述处理，基站通过 X2接口发送携带有切换参考频点信息的切换 准备完成消息， 使得终端能够在指定的上行分量载波上发送随机接入请求， 并在指定的下行分量载波上接收随机接入响应。
实例 2, 目标基站通过 S1接口发送切换准备完成消息。
图 5是根据本发明实施例的实例 2的信令流程图， 如图 5所示， 包括 如下处理：
步骤 1 , 源基站通过 S1 接口向移动性管理实体 （MME, Mobility Management Entity )发送切换请求消息 （ HANDOVER REQUIRED );
步骤 2, MME接收到切换请求消息（ HANDOVER REQUIRED ), 并在 进行切换资源处理后发送切换请求消息 （ HANDOVER REQUEST )到目标 基站；
步骤 3 , 目标基站接收切换请求消息（ HANDOVER REQUEST ), 并构 造切换准备完成消息（ HANDOVER REQUEST ACKNOWLEDGE ),将切换 准备完成消息发送到 MME,具体地，在目标基站构造切换准备完成消息时， 在该消息中的目标基站到源基站的透明包 （Target eNB To Source eNB Transparent Container ) 中携带目标小区指定的切换参考频点信息， 优选地， 可以在移动控制信息（ Mobility Controllnformation )中增加切换参考频点信 息。
具体的， 切换参考频点信息中可以包含目标小区为当前终端作切换所 指定的用于发起随机接入请求的上行分量载波中心频点信息； 优选地， 还 可以包含目标小区指定的用于发送随机接入响应的下行分量载波的中心频 点信息。此外， 目标基站还可以通过 MME向源基站传递目标小区的所有分 量载波的频点和带宽信息， 如果目标小区的所有分量载波的频点和带宽信 息缺省， 那么认为目标小区的所有分量载波频点和带宽信息与当前小区的 所有分量载波频点和带宽信息相同。
步骤 4 , MME 接收到该消息后通过切换命令消息 （ HANDOVER COMMAND )将透明包中的内容透传给源基站。
步骤 5, 源基站接收到切换命令消息后， 通过空口消息将该信息发送给 终端， 终端获取该消息中的参考频点信息及与该分量载波相关的随机接入 配置信息后， 在指定的时频域资源上发起切换随机接入过程， 并可在指定 的下行分量载波读取随机接入响应消息。
通过上述处理，基站通过 S1接口发送携带有切换参考频点信息的切换 准备完成消息， 使得终端能够在指定的上行分量载波上发送随机接入请求， 并在指定的下行分量载波上接收随机接入响应。
方法实施例二
根据本发明的实施例， 提供了一种基站间切换方法， 用于将终端由源 基站的源小区切换到目标基站的目标小区。 图 6是根据本发明方法实施例 二的基站间切换方法的流程图， 如图 6所示， 包括如下处理（步骤 S602 - 步骤 S606 ):
步骤 S602: 目标基站将目标小区的上行分量载波的中心频点信息进行 顺序排列得到第一列表；
具体的， 目标基站将目标小区的上行分量载波的中心频点信息进行顺 序排列得到第一列表， 其中， 第一列表中的第一个上行分量载波的中心频 点信息为终端用于发起随机接入请求的上行分量载波的中心频点信息； 在步骤 S602中， 优选地， 源基站还可以将目标小区的下行分量载波的 中心频点信息进行顺序排列得到第二列表， 其中， 第二列表中的第一个下 行分量载波的中心频点信息为目标小区用于发送随机接入响应的下行分量 载波的中心频点信息。
步骤 S604: 目标基站通过源基站向终端发送携带有第一列表的切换准 备完成消息；
优选地， 切换准备完成消息中还可以携带有第二列表， 在实际应用中， 上述信息 （第一列表和第二列表）可以携带在移动控制信息中， 表 2示出 了携带有第一列表和第二列表的移动控制信息的结构， 如表 2所示， 包括 目标小区全局 ID、 目标小区频点信息、 目标小区带宽信息、 其他移动控制 相关信息。
表 2
Figure imgf000013_0001
需要说明的是， 上述第一列表和第二列表也可以合一设置。
步骤 S606: 终端根据第一列表中第一个上行分量载波的中心频点信息 进行随机接入请求；
优选地， 终端根据第一个下行分量载波的中心频点信息接收目标基站 发送的随机接入响应。
下面结合实例， 对本发明的上述技术方案进行详细的说明。
实例 3
步骤 1 , 无论是通过 S1接口进行切换还是通过 X2接口进行切换， 目 标基站向源基站传递一个包含所有目标小区上行分量载波频点信息和下行 分量载波频点信息的顺序列表， 并且目标基站把期望的切换参考频点信息 作为第一个上行分量载波频点和第一个下行分量载波频点写入顺序列表， 并规定源基站默认收到的顺序列表中的第一个上行分量载波频点和第一个 下行分量载波频点为切换参考频点。 优选地， 包含所有目标小区上行分量载波频点信息和下行分量载波频 点信息的顺序列表可以携带在目标基站到源基站的透明包（Target eNB To Source eNB Transparent Container ) 中的移动控制信息中， 并且， 上述顺序 列表不能为空， 即， 默认为参考频点信息的顺序表中对应的频点信息不能 缺省。
步骤 2,源基站接收到切换完成消息后通过空口消息将该信息发送给终 端， 终端获取该消息中的参考频点信息及与该分量载波相关的随机接入配 置信息后， 在指定的时频域资源上发起切换随机接入过程， 并可在指定的 下行分量载波读取随机接入响应消息。
综上所述， 借助于本发明的技术方案， 通过在切换准备完成消息中增 加切换参考频点信息， 解决了相关技术中多载波 LTE-A系统的切换存在终 端不确定进行随机接入请求的分量载波的问题， 可以有效提高目标基站对 随机接入资源的利用率， 减少随机接入沖突。
显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤 可以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者 分布在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执 行的程序代码来实现， 从而， 可以将它们存储在存储装置中由计算装置来 执行， 或者将它们分别制作成各个集成电路模块， 或者将它们中的多个模 块或步骤制作成单个集成电路模块来实现。 这样， 本发明不限制于任何特 定的硬件和软件结合。
以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于 本领域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精 神和原则之内， 所作的任何修改、 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、 一种基站间切换方法， 其特征在于， 所述方法包括：
目标基站通过源基站向终端发送携带有切换参考频点信息的切换准备 完成消息； 其中， 所述切换参考频点信息包括为所述终端指定的用于发起 随机接入请求的上行分量载波的中心频点信息；
所述终端根据所述上行分量载波的中心频点信息进行随机接入请求。
2、 根据权利要求 1所述的方法， 其特征在于， 所述切换参考频点信息 还包括： 所述目标基站的目标小区用于发送随机接入响应的下行分量载波 的中心频点信息。
3、 根据权利要求 2所述的方法， 其特征在于， 所述终端进行随机接入 请求之后， 所述方法还包括：
所述终端根据所述下行分量载波的中心频点信息， 接收所述目标基站 发送的随机接入响应。
4、 根据权利要求 1所述的方法， 其特征在于， 所述切换准备完成消息 中还携带有所述目标基站的目标小区的全部分量载波的频点和带宽信息。
5、 根据权利要求 1所述的方法， 其特征在于， 所述切换参考频点信息 携带在所述切换准备完成消息的透明包的移动控制信息中。
6、 根据权利要求 1至 5任一项所述的方法， 其特征在于， 所述终端接 收所述切换准备完成消息之前， 所述方法还包括：
所述源基站通过 S1/X2接口发送所述切换准备完成消息； 其中， 在所 述源基站通过所述 X2接口发送所述切换准备完成消息时，将所述切换准备 完成消息携带在预定消息中所有服务小区信息上进行发送；
所述预定消息包括以下之一： X2接口建立消息、 X2接口建立响应消 息、 基站配置更新消息。
7、 根据权利要求 6所述的方法， 其特征在于， 所述源基站通过 S1接 口发送所述切换准备完成消息的处理包括：
所述源基站通过 S1接口将所述切换准备完成消息的透明包发送到移动 管理实体；
所述移动管理实体通过切换命令消息将所述透明包透传到所述源基 站。
8、 一种基站间切换方法， 其特征在于， 所述方法包括源基站和目标基 站； 其中，
目标基站将目标小区的上行分量载波的中心频点信息进行顺序排列得 到第一列表： 所述第一列表中的第一个上行分量载波的中心频点信息为终 端用于发起随机接入请求的上行分量载波的中心频点信息；
所述目标基站通过源基站向所述终端发送携带有所述第一列表的切换 准备完成消息；
所述终端根据所述第一个上行分量载波的中心频点信息进行随机接入 请求。
9、 根据权利要求 8所述的方法， 其特征在于， 所述方法进一步包括： 所述源基站将所述目标小区的下行分量载波的中心频点信息进行顺序 排列得到第二列表： 所述第二列表中的第一个下行分量载波的中心频点信 息为所述目标小区用于发送随机接入响应的下行分量载波的中心频点信 息。
10、 根据权利要求 9所述的方法， 其特征在于， 所述终端进行随机接 入请求之后， 所述方法还包括：
所述终端根据所述第一个下行分量载波的中心频点信息接收所述目标 基站发送的随机接入响应。
PCT/CN2009/075907 2009-04-13 2009-12-23 基站间切换方法 WO2010118618A1 (zh)

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