WO2011018039A1 - 随机接入前导码的发送方法、***及设备 - Google Patents

随机接入前导码的发送方法、***及设备 Download PDF

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Publication number
WO2011018039A1
WO2011018039A1 PCT/CN2010/075919 CN2010075919W WO2011018039A1 WO 2011018039 A1 WO2011018039 A1 WO 2011018039A1 CN 2010075919 W CN2010075919 W CN 2010075919W WO 2011018039 A1 WO2011018039 A1 WO 2011018039A1
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Prior art keywords
terminal
component carrier
random access
base station
uplink component
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PCT/CN2010/075919
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English (en)
French (fr)
Inventor
赵亚利
许芳丽
Original Assignee
大唐移动通信设备有限公司
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.)
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Application filed by 大唐移动通信设备有限公司 filed Critical 大唐移动通信设备有限公司
Priority to EP10807984.9A priority Critical patent/EP2466965B1/en
Priority to US13/390,514 priority patent/US8848611B2/en
Publication of WO2011018039A1 publication Critical patent/WO2011018039A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/002Transmission of channel access control information
    • H04W74/006Transmission of channel access control information in the downlink, i.e. towards the terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • H04W74/0833Random access procedures, e.g. with 4-step access

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method, system, and device for transmitting a random access preamble. Background technique
  • LTE-A LTE Advanced
  • LTE-A Long Term Evolution
  • CA Carrier Aggregation
  • the carrier aggregation technology refers to a mode in which a plurality of component carriers are included in uplink and downlink in one cell, instead of only one set of carriers in LTE and the previous wireless communication system.
  • each component carrier may be continuous or non-contiguous.
  • the maximum bandwidth of each component carrier is 20 MHz, and the bandwidth between the component carriers may be the same or different.
  • the terminal accesses the system from the radio resource control idle (RRC-IDLE) state, also called a knife: initial access;
  • RRC-IDLE radio resource control idle
  • the terminal initiates random access after the radio link fails, which is also a type of initial access;
  • the terminal needs random access during cell handover;
  • uplink data arrives when the terminal is in the RRC-CONNECTED state.
  • the terminal can use the non-contention random access mechanism for random access.
  • the process of non-contention random access is shown in Figure 1. It is mainly divided into the following three messages: Message 0: The base station allocates a random access preamble (R-Preamblelndex) for non-contention random access and a physical random access channel mask number used by the random access (PRACH Mask Index, ra -PRACH-Masklndex ) favor for non-contention random access caused by downlink data arrival, ra-Preamblelndex and ra-PRACH-Masklndex are sent to the terminal through the physical downlink control channel (PDCCH); non-contention random connection caused by handover In, the ra-Preamblelndex and m-PRACH-Masklndex are carried in the handover command and sent to the terminal.
  • R-Preamblelndex a random access preamble
  • a physical random access channel mask number used by the random access PR
  • Message 1 The terminal sends the random access preamble specified in message 0 to the base station on the PRACH resource specified by ra-PRACH-Masklndex according to the received ra-Preamblelndex and ra-PRACH-Masklndex.
  • the base station sends a random access response to the terminal.
  • the terminal performs measurement reporting, and the source base station performs a handover decision.
  • the source base station determines to send a handover request command to the target base station after the handover according to the handover decision result, and the target base station receives the handover request command sent by the source base station, and then performs an admission decision.
  • the handover request response information is sent to the source base station, and after receiving the handover request response information, the source base station sends a handover command to the terminal.
  • the handover request response (HANDOVER REQUEST ACKNOWLEDGE) message in step 6 of FIG. 2 includes a target eNB To Source eNB Transparent Container, which is a transparent container to be sent to the terminal.
  • the container is part of the handover command. If non-contention random access is selected, the container contains ra-Preamblelndex and ra-PRACH-Masklndex dedicated to non-contention random access.
  • Resource the resource is a two-dimensional resource, and the dimension includes a subframe and a PRACH resource (subframe/PRACH resource).
  • the correspondence between the ra-PRACH Mask Index and the PRACH resources in the physical layer in the LTE system is shown in the following table. In the following table, the PRACH Resource Index indicates the PRACH resource number in a radio frame, and the specific physical resource corresponding to the PRACH resource number is represented by the physical Layer configuration.
  • subframes with an even number subframes with an even number
  • the first PRACH resource of each first even subframe of each even subframe PRACH resource
  • the first PRACH resource of each first odd subframe of each odd subframe a PRACH resource
  • the terminal After the introduction of CA ⁇ t, since the uplink supports multiple component carriers at the same time, the terminal cannot determine on which uplink component carrier to transmit the random access preamble to the base station. If the uplink access preamble of the terminal and the uplink carrier of the random access preamble are inconsistent, the random access procedure may not be completed; or, if the terminal simultaneously transmits the random access preamble on multiple uplink component carriers, Although the base station can receive it, it will waste uplink resources.
  • the embodiment of the invention provides a method, a system and a device for transmitting a random access preamble, which are used to solve the problem that the terminal cannot determine on which uplink component carrier to send a random access preamble to the LTE-A system.
  • a method for transmitting a random access preamble comprising: The base station determines the uplink component carrier used by the terminal to send the random access preamble, and sends the identifier information of the uplink component carrier to the terminal, where the terminal is configured to use the component carrier corresponding to the identifier of the uplink component carrier to send a random connection. Enter the preamble.
  • a method for transmitting a random access preamble comprising:
  • the terminal acquires an identifier of an uplink component carrier that is used by the base station to carry the random access preamble, and determines an uplink component carrier corresponding to the carrier identifier from the multiple uplink component carriers;
  • the terminal transmits a random access preamble through the determined one uplink component carrier.
  • a transmission system for randomly accessing preambles comprising:
  • a base station configured to determine an uplink component carrier used by the terminal to send a random access preamble, and send the identifier information of the uplink component carrier to the terminal;
  • the terminal is configured to select a component carrier corresponding to the identifier of the uplink component carrier from multiple uplink component carriers that are supported by the UE, and use the component carrier to send a random access preamble to the base station.
  • a base station comprising:
  • a carrier determining unit configured to determine an uplink member carrier used by the terminal to send a random access preamble
  • the information sending unit is configured to send the identifier information of the uplink component carrier to the terminal, and access the preamble.
  • the terminal includes:
  • the information receiving unit is configured to receive the identifier information of the uplink component carrier sent by the base station, and the preamble sending unit is configured to select a component carrier corresponding to the identifier of the uplink component carrier from the multiple uplink component carriers supported by the base station, and use the component carrier The component carrier transmits a random access preamble to the base station.
  • the base station sends the identification information of the uplink component carrier used by the determined terminal to the random access preamble to the terminal, and the terminal sends the random access preamble to the base station by using the component carrier corresponding to the uplink component carrier identifier, thereby
  • the terminal may select a component carrier for transmitting a random access preamble according to the indication of the base station, and the terminal may determine which uplink component carrier is sent to the base station. Send a random access preamble.
  • FIG. 2 is a schematic flowchart of a cell handover in the prior art
  • FIG. 3 is a schematic flowchart of a method according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a system according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention. detailed description
  • the embodiment of the present invention provides a method for transmitting a random access preamble.
  • the base station sends the terminal to the random connection.
  • the identifier information of the uplink component carrier used by the preamble is sent to the terminal, and the terminal is instructed to select a component carrier for transmitting the random access preamble according to the identifier information of the uplink component carrier.
  • a method for transmitting a random access preamble specifically includes the following steps:
  • Step 30 The base station determines the uplink component carrier used by the terminal to send the random access preamble, and sends the identifier information of the uplink component carrier to the terminal.
  • Step 31 After receiving the identifier information of the uplink component carrier sent by the base station, the terminal sends the random access preamble to the base station by using the component carrier.
  • the base station determines the uplink component carrier used by the terminal to send the random access preamble, and the specific determining method may be as follows:
  • the base station determines the uplink primary carrier of the terminal as the component carrier used by the terminal to send the random access preamble;
  • the second type the base station determines, according to the binding relationship between the uplink and downlink component carriers that is set in advance, and the downlink component carrier used by the base station to send the first message, the uplink component carrier used by the terminal to send the random access preamble;
  • the base station determines, according to the correspondence between the uplink and downlink component carriers configured in the system message, the base station according to the downlink component carrier used by the first message.
  • the corresponding uplink component carrier is an uplink-loaded wave used by the terminal to send a random access preamble.
  • the base station selects one uplink component carrier from the multiple uplink component carriers according to the load information of the multiple uplink component carriers supported by the current system, and uses the component carrier used by the terminal to send the random access preamble.
  • the uplink component carrier supported by the terminal and having the least load is selected from the multiple uplink component carriers supported by the current system as the component carrier used by the terminal to send the random access preamble.
  • step 30 the base station sends the identifier information of the uplink component carrier to the terminal, and the following method can be used:
  • the base station carries the identifier information of the uplink component carrier in a PRACH Mask Index parameter used to indicate the physical random access channel (PRACH) resource used by the terminal to send the random access preamble, and then The PRACH Mask Index parameter is sent to the terminal.
  • the terminal reads the identifier of the uplink component carrier from the received PRACH Mask Index parameter.
  • PRACH physical random access channel
  • the base station carries the identifier information of the uplink component carrier in the PRACH Mask Index parameter, and may adopt the following method:
  • the base station converts the PRACH Mask Index parameter represented by an integer into a PRACH Mask Index parameter represented by a binary
  • the base station adds a carrier indication field in the PRACH Mask Index parameter represented by the binary, and adds the identification information of the uplink component carrier in binary, and adds the information to the added carrier indication field;
  • the base station may add a carrier indication field at the head or tail of the PRACH Mask Index parameter represented by binary.
  • the base station sends the PRACH Mask Index parameter carrying the carrier indication field to the terminal.
  • the terminal reads the identification information of the uplink component carrier from the carrier indication field of the PRACH Mask Index parameter.
  • the base station carries the identifier information of the uplink component carrier in the PRACH Mask Index parameter, and is not limited to the foregoing method, and any other method capable of carrying the identifier information of the uplink component carrier in the PRACH Mask Index parameter is protected by the present invention. Within the scope.
  • the PRACH Mask Inde is extended in the LTE system, and the two-dimensional representation of the subframe/PRACH resource of the PRACH Mask Index is extended to the three dimensions of the subframe/PRACH resource/component carrier, and the terminal according to the received PRACH Mask.
  • the component carrier dimension included in the Index can obtain the identification information of the uplink component carrier used for transmitting the random access preamble.
  • the parameter of the radio resource control (RRC) layer configuration parameter PRACH Mask Index is changed from integer type to binary bit type.
  • the 16 integer values specified by the LTE system can be represented by 4 bits (bit), and the CA system is aggregated. If the number of carriers is N, the number of bits of the PRACH Mask Index can be expanded.
  • the number of bits after the extension is (" ⁇ 2 ⁇ ⁇ + 4 " bit, and the number of bits added is used to indicate the identity of the uplink component carrier. It is placed at the beginning or the end of the original PRACH Mask Index bit.
  • RRC radio resource control
  • Step 1 The base station modifies the RRC layer-specific PRACH parameters, as follows:
  • the RRC layer-specific PRACH parameters in the LTE system are as follows:
  • the ra-PRACH-Masklndex takes a value of 0...15, assuming that the number of carriers aggregated by the CA is 5, and the two-dimensional representation of the subframe/PRACH resource of the Bay' J PRACH Mask Index is extended to subframe/PRACH resource/carrier three.
  • the identification information bit indicating the uplink component carrier added in the ra-PRACH-Masklndex may be placed at the forefront of the bit representing the two-dimensional resource of the subframe/PRACH resource, or may be placed at the end of the bit, for example, in the tail. According to the above changes, before the PRACH Mask Index
  • TDD Time Division Duplex
  • the first PRACH resource of each first even subframe of each even subframe PRACH resource
  • the first PRACH resource of each first odd subframe of each odd subframe a PRACH resource
  • Step 2 The base station allocates a random access preamble and a PRACH resource used by the random access for the terminal to perform non-contention random access, and determines an RRC layer random access channel dedicated configuration (RACH-ConfigDedicated) module according to the allocation situation.
  • RACH-ConfigDedicated RRC layer random access channel dedicated configuration
  • Step 3 The base station sets the parameter Preamble Index configured in step 2 by message 0 (MsgO). And the PRACH Mask Index is sent to the terminal.
  • the process of the terminal sending the random access preamble and accessing the network may be as follows:
  • Step 4 The terminal receives the MsgO, determines the random access preamble to be sent by the message 1 (Msgl) according to the Preamble Index information carried by the MsgO, and determines to send the three-dimensional resource according to the sub frame/PRACH resource/component carrier indicated by the PRACH Mask Index.
  • the specific PRACH resource used by the random access preamble including which uplink component carrier is used;
  • Step 5 The terminal sends a random access preamble to the base station through the Msgl on the PRACH resource determined in step 4.
  • Step 6 After receiving the random access preamble, the base station sends a random access response to the terminal.
  • Step 7 The terminal performs uplink data transmission for the uplink resource allocated by the terminal in the random access response in step 6.
  • an embodiment of the present invention further provides a transmission system for a random access preamble, where the system includes a base station 40 and a terminal 41, where:
  • the base station 40 is configured to determine, by the terminal, the uplink component carrier used by the terminal to send the random access preamble, and send the identifier information of the uplink component carrier to the terminal;
  • the terminal 41 is configured to select a component carrier corresponding to the identifier of the uplink component carrier from multiple uplink component carriers supported by the UE, and send the random access preamble to the base station by using the component carrier.
  • the base station 40 is configured to:
  • the terminal 41 is configured to:
  • the identification information of the uplink component carrier is read from the received PRACH Mask Index parameter.
  • the base station 40 is configured to:
  • the base station 40 is configured to:
  • the carrier indication field is added at the head or tail of the PRACH Mask Index parameter represented by the binary.
  • the base station 40 is used for: a carrier carrier; or
  • an embodiment of the present invention provides a base station, which can be applied to a transmission system of a random access preamble, where the base station includes a carrier determining unit 50 and an information sending unit 51, where:
  • the carrier determining unit 50 is configured to determine an uplink component carrier used by the terminal to send a random access preamble
  • the information sending unit 51 is configured to send the identifier information of the uplink component carrier to the terminal, and instruct the terminal to send a random access preamble to the base station by using a component carrier corresponding to the identifier of the uplink component carrier.
  • the information sending unit 51 includes an information carrying unit and a parameter sending unit, where: the information carrying unit is configured to carry the identifier information of the uplink component carrier in a PRACH used to indicate that the terminal sends a random access preamble PRACH Mask Index parameter of the resource Medium
  • the information carrying unit is used to:
  • the parameter sending unit is used to:
  • the information carrying unit is used to:
  • the carrier indication field is added at the head or tail of the PRACH Mask Index parameter represented by the binary.
  • the carrier determining unit 50 includes one or any combination of a first determining unit, a second determining unit, and a third determining unit, where:
  • the first determining unit is configured to determine a primary carrier of the terminal as a component carrier used by the terminal to send a random access preamble;
  • the second determining unit is configured to determine, according to a binding relationship between the uplink and downlink component carriers that is preset, and a downlink component carrier used by the base station to send the first message, to determine an uplink used by the terminal to send the random access preamble a component carrier;
  • the first message is a message used by the base station to send a Preamble Index parameter and a PRACH Mask Index parameter;
  • the third determining unit is configured to select, according to load information of multiple uplink component carriers supported by the current system, one uplink component carrier from the multiple uplink component carriers as a component carrier used by the terminal to send a random access preamble .
  • an embodiment of the present invention further provides a terminal, which may be applied to a system for randomly accessing a preamble, where the terminal includes an information receiving unit 60 and a preamble transmitting unit 61, where: the information receiving unit 60 is configured to: Receiving identification information of the uplink component carrier sent by the base station; the preamble sending unit 61 is configured to select the uplink component carrier that is supported by the uplink component carrier A member carrier corresponding to the identifier of the row member carrier, and the component carrier is used to send a random access preamble to the base station.
  • the information receiving unit 60 includes a parameter receiving unit and an information reading unit, where: the parameter receiving unit is configured to receive a PRACH Mask sent by the base station to indicate that the terminal sends the PRACH resource used by the random access preamble. Index parameter;
  • the information reading unit is configured to read the identification information of the uplink component carrier from the PRACH Mask Index parameter.
  • the base station sends the identifier information of the uplink component carrier to the terminal through the PRACH Mask Index parameter, and may also carry the identifier information in other parameters or signaling messages and send the identifier to the terminal, and use any method to send the uplink member.
  • the scheme of transmitting the identification information of the carrier to the terminal is within the protection scope of the present invention.
  • the base station sends, to the terminal, the identification information of the uplink member carrier wave used by the terminal to send the random access preamble, and the terminal uses the uplink component carrier corresponding to the uplink component carrier identifier.
  • the base station sends a random access preamble, so that the terminal can select a component carrier for transmitting the random access preamble according to the indication of the base station, and the terminal can determine, on which uplink component carrier, the random access preamble is sent to the base station, and then the terminal The random access process can be completed successfully.
  • the problem that the random access procedure caused by the terminal transmitting the random access preamble and the base station receiving the random access preamble may not be completed or the terminal transmits the uplink resources on multiple uplink component carriers at the same time may be avoided.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Description

随机接入前导码的发送方法、 ***及设备 技术领域
本发明涉及无线通信领域, 尤其涉及一种随机接入前导码的发送方法、 ***及设备。 背景技术
长期演进升级( LTE Advanced, LTE-A )***的峰值速率与长期演进( LTE ) ***相比有很大的提高, 要求达到下行 IGbps, 上行 500Mbps。 同时, LTE-A ***要求与 LTE***有很好的兼容性。 基于提高峰值速率、 与 LTE***兼容 以及充分利用频谱资源的需要, LTE-A ***引入了载波聚合 ( Carrier Aggregation , CA )技术。
载波聚合技术是指在一个小区内上下行各包含多个成员载波 (component carrier), 而不是 LTE及之前的无线通信***中只有一套载波的模式。 在载波 聚合的***中各个成员载波可以是连续或非连续的, 为了和 LTE***兼容, 每个成员载波的最大带宽为 20MHz, 各成员载波间的带宽可以相同或不同。
在 LTE***中终端随机接入的原因主要有如下几种:
第一种, 终端从无线资源控制空闲(RRC— IDLE )状态接入***, 也称为 刀: ½ έ入 ( initial access );
第二种, 终端在无线链路失败后发起随机接入, 其也是初始接入的一种; 第三种, 终端在小区切换过程中需要随机接入;
第四种, 终端处于无线资源控制连接( RRC— CONNECTED )状态时有下 行数据到达;
第五种, 终端处于 RRC— CONNECTED状态时有上行数据到达。
对于第三种和第四种情况, 终端可以采用非竟争随机接入机制进行随机 接入, 非竟争随机接入的过程如图 1所示, 主要分为以下三条消息: 消息 0:基站为终端分配用于非竟争随机接入的随机接入前导码(Random Access Preamble, ra-Preamblelndex ) 以及随机接入使用的物理随机接入信道 掩码编号 ( PRACH Mask Index, ra-PRACH-Masklndex )„ 对于下行数据到达 引起的非竟争随机接入,通过物理下行控制信道( PDCCH )将 ra-Preamblelndex 和 ra- PRACH-Masklndex发送给终端; 对于切换引起的非竟争随机接入, 将 ra-Preamblelndex 和 m-PRACH-Masklndex 携带在切换命令 ( handover command ) 中发送给终端。
消息 1: 终端才 据接收到的 ra-Preamblelndex和 ra-PRACH-Masklndex, 在 ra-PRACH-Masklndex指定的 PRACH资源上向基站发送消息 0中指定的随 机接入前导码。
消息 2: 基站向终端发送随机接入响应。
下面简要说明同一个移动性管理实体(MME ) 内不同基站间的小区切换 流程, 如图 2所示:
首先, 终端进行测量上报, 源基站进行切换判决, 源基站根据切换判决 结果决定切换之后向目标基站发送切换请求命令, 目标基站接收到源基站发 送的切换请求命令后进行接纳判决, 如果可以接纳, 则向源基站发送切换请 求应答信息, 源基站接收到切换请求应答信息之后, 向终端发送切换命令。
其中, 附图 2 中步骤 6 中的切换请求应答(HANDOVER REQUEST ACKNOWLEDGE ) 消息包含一个目标基站到源基站的透明容器( Target eNB To Source eNB Transparent Container ),该容器是要发送到终端的透明容器,该 容器是切换命令的一部分, 如果选择非竟争随机接入, 该容器中包含非竟争 随机接入专用的 ra-Preamblelndex和 ra-PRACH-Masklndex。 资源, 该资源为两维资源, 维度包括子帧和 PRACH资源( subframe/PRACH resource )。 LTE***中 ra-PRACH Mask Index与物理层中 PRACH资源的对应 关系如下表所示, 下表中 PRACH Resource Index表示的是一个无线帧内的 PRACH资源编号, PRACH资源编号对应的具体物理资源由物理层配置。 PRACH 允许使用的 PRACH资源 允许使用的 PRACH资源
Mask Index (频分双工 (FDD)***中)
(时分;!又工 (TDD)***中
0 全部 全部
1 PRACH Resource Index 0 PRACH Resource Index 0
2 PRACH Resource Index 1 PRACH Resource Index 1
3 PRACH Resource Index 2 PRACH Resource Index 2
4 PRACH Resource Index 3 PRACH Resource Index 3
5 PRACH Resource Index 4 PRACH Resource Index 4
6 PRACH Resource Index 5 PRACH Resource Index 5
7 PRACH Resource Index 6 预留
8 PRACH Resource Index 7 预留
9 PRACH Resource Index 8 预留
10 PRACH Resource Index 9 预留
11 编号为偶数的子帧; 编号为偶数的子帧;
每个偶数子帧的第一 每个偶数子帧 的第一个 个 PRACH资源; PRACH资源;
12 编号为奇数的子帧; 编号为奇数的子帧;
每个奇数子帧的第一 每个奇数子帧的第一个 个 PRACH资源; PRACH资源;
13 预留 每个子帧的第一个 PRACH资
源;
14 预留 每个子帧的第二个 PRACH资
源;
15 预留 每个子帧的第三个 PRACH资
源; 在引入 CA^t 术后, 由于上行同时支持多个成员载波, 终端无法确定在哪 个上行成员载波上向基站发送随机接入前导码。 如果终端发送随机接入前导 码和基站接收随机接入前导码的上行载波不一致, 则可能导致随机接入过程 无法完成; 或者, 如果终端在多个上行成员载波上同时发送随机接入前导码, 虽然基站可以接收到, 但是会浪费上行资源。 发明内容
本发明实施例提供一种随机接入前导码的发送方法、 ***及设备, 用于 解决 LTE-A***中终端无法确定在哪个上行成员载波上向基站发送随机接入 前导码的问题。
一种随机接入前导码的发送方法, 该方法包括: 基站确定终端发送随机接入前导码所使用的上行成员载波, 将所述上行 成员载波的标识信息发送给终端, 用于指示所述终端利用所述上行成员载波 的标识对应的成员载波发送随机接入前导码。
一种发送随机接入前导码的方法, 该方法包括:
终端获取基站指示的承载随机接入前导码的上行成员载波的标识, 从多 个上行成员载波中确定该载波标识对应的一个上行成员载波;
终端通过确定的一个上行成员载波发送随机接入前导码。
一种随机接入前导码的发送***, 该***包括:
基站, 用于确定终端发送随机接入前导码所使用的上行成员载波, 将所 述上行成员载波的标识信息发送给终端;
终端, 用于从自身支持的多个上行成员载波中选取所述上行成员载波的 标识对应的成员载波, 并利用该成员载波向所述基站发送随机接入前导码。
一种基站, 该基站包括:
载波确定单元, 用于确定终端发送随机接入前导码所使用的上行成员载 波;
信息发送单元, 用于将所述上行成员载波的标识信息发送给所述终端, 机接入前导码。
—种终端, 该终端包括:
信息接收单元, 用于接收基站发来的上行成员载波的标识信息; 前导码发送单元, 用于从自身支持的多个上行成员载波中选取所述上行 成员载波的标识对应的成员载波, 并利用该成员载波向所述基站发送随机接 入前导码。
本发明中, 基站将确定的终端发送随机接入前导码所使用的上行成员载 波的标识信息发送给终端, 终端利用该上行成员载波标识对应的成员载波向 基站发送随机接入前导码, 从而使得终端可以根据基站的指示选取用于发送 随机接入前导码的成员载波, 终端能够确定在哪个上行成员载波上向基站发 送随机接入前导码。 附图说明
图 1为现有技术中非竟争随机接入的流程示意图;
图 2为现有技术中小区切换的流程示意图;
图 3为本发明实施例提供的方法流程示意图;
图 4为本发明实施例提供的***结构示意图;
图 5为本发明实施例提供的基站结构示意图;
图 6为本发明实施例提供的终端结构示意图。 具体实施方式
为了解决 LTE-A***中终端无法确定发送随机接入前导码所使用的成员 载波的问题, 本发明实施例提供一种随机接入前导码的发送方法, 本方法中, 基站将终端发送随机接入前导码所使用的上行成员载波的标识信息发送给终 端, 指示终端根据该上行成员载波的标识信息选择用于发送随机接入前导码 的成员载波。
参见图 3, 本发明实施例提供的随机接入前导码的发送方法, 具体包括以 下步骤:
步骤 30: 基站确定终端发送随机接入前导码所使用的上行成员载波, 将 所述上行成员载波的标识信息发送给终端;
步骤 31 : 终端接收到基站发来的上行成员载波的标识信息后, 从自身支 用该成员载波向基站发送随机接入前导码。
步骤 30中, 基站确定终端发送随机接入前导码所使用的上行成员载波, 其具体确定方法可以采用如下三种:
第一种, 基站将终端的上行主载波确定为该终端发送随机接入前导码所 使用的成员载波; 第二种, 基站根据预先设定的上下行成员载波之间的绑定关系以及基站 发送第一消息使用的下行成员载波, 确定终端发送随机接入前导码所使用的 上行成员载波;第一消息可以为基站发送 Preamble Index参数和 PRACH Mask Index 参数所利用的消息等; 例如, 基站根据***消息中配置的上下行成员 载波之间的——对应关系, 根据第一消息所使用的下行成员载波确定对应的 上行成员载波为终端发送随机接入前导码使用的上行成负载波。
第三种, 基站根据当前***支持的多个上行成员载波的负载信息从该多 个上行成员载波中选择一个上行成员载波作为终端发送随机接入前导码所使 用的成员载波。 例如, 从当前***支持的多个上行成员载波中选取终端支持 的并且负载最少的上行成员载波作为终端发送随机接入前导码所使用的成员 载波。
步骤 30中, 基站将上行成员载波的标识信息发送给终端, 可以采用如下 方法:
首先, 基站将上行成员载波的标识信息携带在用于指示终端发送随机接 入前导码所使用的物理随机接入信道(PRACH ) 资源的 PRACH掩码编号 ( PRACH Mask Index )参数中 , 然后, 将该 PRACH Mask Index参数发送给 终端。终端则从接收到的 PRACH Mask Index参数中读取上行成员载波的标识
'ίά息。
具体的,基站将上行成员载波的标识信息携带在 PRACH Mask Index参数 中, 可以采用如下方法:
首先,基站将由整数表示的 PRACH Mask Index参数转换为由二进制表示 的 PRACH Mask Index参数;
然后, 基站在由二进制表示的 PRACH Mask Index参数中增加载波指示 域, 以二进制表示上行成员载波的标识信息后将该信息添加在增加的载波指 示域中;
这里 ,基站可以在由二进制表示的 PRACH Mask Index参数的头部或尾部 增加载波指示域。 最后,基站将携带载波指示域的 PRACH Mask Index参数发送给终端。终 端从 PRACH Mask Index参数的载波指示域读取上行成员载波的标识信息。
当然, 基站将上行成员载波的标识信息携带在 PRACH Mask Index参数 中, 并不局限于上述方法, 任何其他能够将上行成员载波的标识信息携带在 PRACH Mask Index参数中的方法均在本发明的保护范围内。
下面以具体实例说明将上行成员载波的标识信息携带在 PRACH Mask Index参数的实现过程:
对 LTE***中 PRACH Mask Inde 进行扩展, 将 PRACH Mask Index的 subframe/PRACH resource两维表示方式扩展为 subframe/PRACH resource/成 员载波( component carrier )三个维度的表示方式, 终端根据接收到的 PRACH Mask Index包含的 component carrier维度即可以得到发送随机接入前导码使 用的上行成员载波的标识信息。
将 PRACH Mask Index的 subframe/PRACH resource两维表示方式扩展为 subframe/PRACH resource/component carrier三维表示方式的方法有艮多种,其 中对协议影响比较小且实现比较简单的一种实现方式即: 将无线资源控制 ( radio resource control, RRC )层配置的参数 PRACH Mask Index表示方式由 整数型修改为二进制比特型, LTE***规定的 16个整数值可以用 4比特(bit ) 表示, 设 CA***聚合的载波个数为 N, 则可以对 PRACH Mask Index的 bit 数进行扩展, 扩展后的 bit数为 (「^2 ΛΠ + 4 ) bit, 增加的 bit数用于表示上行 成员载波标识, 该 bit可以放在原 PRACH Mask Index比特的首部或者尾部。 当然上述只是该专利思想的一种可能的实现方式, 但实现时并不局限于此方 式, 还可以有其它实现方式。
本实施例的一种具体实现举例如下:
步骤 1 : 基站对 RRC层专用 PRACH参数进行修改, 具体如下:
LTE***中 RRC层专用 PRACH参数如下:
- ASNl START RACH-ConfigDedicated ::= SEQUENCE {
ra-Preamblelndex INTEGER (0..63),
ra-PRACH-Masklndex INTEGER (0..15),
}
- ASN1STOP
其中 ra- PRACH-Masklndex取值为 0...15,假设 CA聚合的载波个数为 5, 贝' J PRACH Mask Index 的 subframe/PRACH resource 两维表示方式扩展为 subframe/PRACH resource/载波三个维度需要增加的 bit数为 3bit, 即 PRACH Mask Index需要的总的 bit数为( 4+3=7 ) bit, 则将 RRC层专用 PRACH参数 配置^ ^改为:
- ASN1 START
RACH-ConfigDedicated: := SEQUENCE {
ra-Preamblelndex INTEGER (0..63),
ra-PRACH-Masklndex BIT STRING ( SIZE ( 7 ) ) ,
}
- ASN1STOP
ra-PRACH-Masklndex中增加的表示上行成员载波的标识信息 bit可以放 在原来表示 subframe/PRACH resource二维资源的 bit的最前端, 也可以放在 这些 bit的尾部, 以放在尾部为例, 按照上迷修改后, PRACH Mask Index前
下表:
PRACH 允许使用的 PRACH资源 允许使用的 PRACH资源
Mask Index (频分双工 (FDD)***中)
(时分双工 (TDD)***中
0000 全部 全部
0001 PRACH Resource Index 0 PRACH Resource Index 0
0010 PRACH Resource Index 1 PRACH Resource Index 1
0011 PRACH Resource Index 2 PRACH Resource Index 2
0100 PRACH Resource Index 3 PRACH Resource Index 3
0101 PRACH Resource Index 4 PRACH Resource Index 4
0110 PRACH Resource Index 5 PRACH Resource Index 5
0111 PRACH Resource Index 6 预留
1000 PRACH Resource Index 7 预留 1001 PRACH Resource Index 8 预留
1010 PRACH Resource Index 9 预留
1011 编号为偶数的子帧; 编号为偶数的子帧;
每个偶数子帧的第一 每个偶数子帧的第一个 个 PRACH资源; PRACH资源;
1100 编号为奇数的子帧; 编号为奇数的子帧;
每个奇数子帧的第一 每个奇数子帧的第一个 个 PRACH资源; PRACH资源;
1101 预留 每个子帧的第一个 PRACH资
源;
1110 预留 每个子帧的第二个 PRACH资
源;
1111 预留 每个子帧的第三个 PRACH资
源;
PRACH Mask Index中后 3bit的含义如下表:
Figure imgf000010_0001
步骤 2:基站为要进行非竟争随机接入的终端分配随机接入前导码以及随 机接入使用的 PRACH资源, 并根据分配情况, 确定 RRC层随机接入信道专 用配置( RACH-ConfigDedicated )模块中配置的参数 Preamble Index和 PRACH Mask Index的取值。
步骤 3 : 基站通过消息 0 ( MsgO )将步骤 2中配置的参数 Preamble Index 和 PRACH Mask Index发送给终端。
在基站向终端发送随机接入前导码后, 终端发送随机接入前导码并接入 网络的流程可以如下:
步骤 4: 终端接收到 MsgO, 根据 MsgO携带的 Preamble Index信息确定 消息 1 ( Msgl )要发送的随机接入前导码, 根据 PRACH Mask Index表示的 sub frame/PRACH resource/component carrier三维度资源确定发送该随机接入 前导码所使用的具体的 PRACH资源, 包括使用哪一个上行成员载波;
步骤 5: 终端在步骤 4确定的 PRACH资源上通过 Msgl向基站发送随机 接入前导码;
步骤 6: 基站正确接收到随机接入前导码后向终端发送随机接入响应; 步骤 7:终端 居步骤 6随机接入响应中为该终端分配的上行资源进行上 行数据传输。
参见图 4, 本发明实施例还提供一种随机接入前导码的发送***, 该*** 包括基站 40和终端 41, 其中:
基站 40, 用于确定终端发送随机接入前导码所使用的上行成员载波, 将 所述上行成员载波的标识信息发送给终端;
终端 41 , 用于从自身支持的多个上行成员载波中选取所述上行成员载波 的标识对应的成员载波, 并利用该成员载波向所述基站发送随机接入前导码。
所述基站 40用于:
将所述上行成员载波的标识信息携带在用于指示所述终端发送随机接入 前导码所使用的 PRACH资源的 PRACH Mask Index参数中, 并将该 PRACH Mask Index参数发送给所述终端;
相应的, 所述终端 41用于:
从接收到的所述 PRACH Mask Index参数中读取所述上行成员载波的标 识信息。
所述基站 40用于:
将由整数表示的所述 PRACH Mask Index 参数转换为由二进制表示的 PRACII Mask Index参数; 在所述由二进制表示的 PRACH Mask Index参数中 增加载波指示域, 以二进制表示所述上行成员栽波的标识信息后将该信息添 加在所述载波指示域中;将携带所述载波指示域的 PRACH Mask Index参数发 送给所述终端。
所述基站 40用于:
在所述由二进制表示的 PRACH Mask Index参数的头部或尾部增加所述 载波指示域。
所述基站 40用于: 员载波; 或者,
根据预先设定的上下行成员载波之间的绑定关系以及基站发送第一消息 使用的下行成员载波, 确定所述终端发送随机接入前导码所使用的上行成员 载波; 所述第一消息为基站发送 Preamble Index参数和 PRACH Mask Index参 数所利用的消息; 或者,
根据当前***支持的多个上行成员载波的负载信息从该多个上行成员载 波中选择一个上行成员栽波作为所述终端发送随机接入前导码所使用的成员 载波。
参见图 5, 本发明实施例提供一种基站, 可以应用于随机接入前导码的发 送***中, 该基站包括载波确定单元 50和信息发送单元 51 , 其中:
载波确定单元 50, 用于确定终端发送随机接入前导码所使用的上行成员 载波;
信息发送单元 51,用于将所述上行成员载波的标识信息发送给所述终端, 指示所述终端利用所述上行成员载波的标识对应的成员载波向本基站发送随 机接入前导码。
所述信息发送单元 51包括信息携带单元和参数发送单元, 其中: 信息携带单元, 用于将所述上行成员载波的标识信息携带在用于指示所 述终端发送随机接入前导码所使用的 PRACH资源的 PRACH Mask Index参数 中;
参数发送单元, 用于将所述 PRACH Mask Index参数发送给所述终端。 所述信息携带单元用于:
将由整数表示的所述 PRACH Mask Index 参数转换为由二进制表示的 PRACH Mask Index参数; 在所述由二进制表示的 PRACH Mask Index参数中 增加载波指示域, 以二进制表示所述上行成员载波的标识信息后将该信息添 加在所述载波指示域中;
相应的, 所述参数发送单元用于:
将携带所述载波指示域的 PRACH Mask Index参数发送给所述终端。 所述信息携带单元用于:
在所述由二进制表示的 PRACH Mask Index参数的头部或尾部增加所述 载波指示域。
所述载波确定单元 50包括第一确定单元、 第二确定单元、 第三确定单元 中的一个或任意组合, 其中:
所述第一确定单元, 用于将所述终端的主载波确定为该终端发送随机接 入前导码所使用的成员载波;
所述第二确定单元, 用于根据预先设定的上下行成员载波之间的绑定关 系以及基站发送第一消息使用的下行成员载波, 确定所述终端发送随机接入 前导码所使用的上行成员载波;所述第一消息为基站发送 Preamble Index参数 和 PRACH Mask Index参数所利用的消息;
所述第三确定单元, 用于根据当前***支持的多个上行成员载波的负载 信息从该多个上行成员载波中选择一个上行成员载波作为所述终端发送随机 接入前导码所使用的成员载波。
参见图 6, 本发明实施例还提供一种终端, 可以应用于随机接入前导码的 发送***中, 该终端包括信息接收单元 60和前导码发送单元 61, 其中: 信息接收单元 60, 用于接收基站发来的上行成员载波的标识信息; 前导码发送单元 61, 用于从自身支持的多个上行成员载波中选取所述上 行成员载波的标识对应的成员载波, 并利用该成员载波向所述基站发送随机 接入前导码。
所述信息接收单元 60包括参数接收单元和信息读取单元, 其中: 参数接收单元, 用于接收所述基站发来的用于指示本终端发送随机接入 前导码所使用的 PRACH资源的 PRACH Mask Index参数;
信息读取单元,用于从所述 PRACH Mask Index参数中读取所述上行成员 载波的标识信息。
需要说明的是,本发明中基站除了通过 PRACH Mask Index参数向终端发 送上行成员载波的标识信息, 还可以将该标识信息携带在其他参数或信令消 息中发送给终端, 采用任何方式将上行成员载波的标识信息发送给终端的方 案均在本发明的保护范围内。
综上, 本发明实施例提供的方案中, 基站将确定的终端发送随机接入前 导码所使用的上行成员栽波的标识信息发送给终端, 终端利用该上行成员载 波标识对应的上行成员载波向基站发送随机接入前导码, 从而使得终端可以 根据基站的指示选取用于发送随机接入前导码的成员载波, 终端能够确定在 哪个上行成员载波上向基站发送随机接入前导码, 进而终端的随机接入过程 可以顺利完成。 同时避免了终端发送随机接入前导码和基站接收随机接入前 导码的上行载波不一致可能导致的随机接入过程无法完成或者终端在多个上 行成员载波上同时发送造成上行资源的问题。
本领域内的技术人员应明白, 本发明的实施例可提供为方法、 ***、 或 计算机程序产品。 因此, 本发明可采用完全硬件实施例、 完全软件实施例、 或结合软件和硬件方面的实施例的形式。 而且, 本发明可采用在一个或多个 其中包含有计算机可用程序代码的计算机可用存储介质 (包括但不限于磁盘 存储器、 CD-ROM、 光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、 设备(***)、 和计算机程序产 品的流程图和 /或方框图来描述的。 应理解可由计算机程序指令实现流程图 和 /或方框图中的每一流程和 /或方框、 以及流程图和 /或方框图中的流程 和 /或方框的结合。 可提供这些计算机程序指令到通用计算机、 专用计算机、 过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流 程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的 装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设 备以特定方式工作的计算机可读存储器中, 使得存储在该计算机可读存储器 中的指令产生包括指令装置的制造品, 该指令装置实现在流程图一个流程或 多个流程和 /或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上, 使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的 处理, 从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图 一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的步 骤。
尽管已描述了本发明的优选实施例, 但本领域内的技术人员一旦得知了 基本创造性概念, 则可对这些实施例作出另外的变更和修改。 所以, 所附权 利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。 发明的精神和范围。 这样, 倘若本发明的这些修改和变型属于本发明权利要 求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种随机接入前导码的发送方法, 其特征在于, 该方法包括: 基站确定终端发送随机接入前导码所使用的上行成员载波;
基站将所述上行成员载波的标识信息发送给终端, 用于指示所述终端利
2、 如权利要求 1所述的方法, 其特征在于, 所述基站将所述上行成员载 波的标识信息发送给终端包括:
所述基站将所述上行成员载波的标识信息携带在用于指示所述终端发送 随机接入前导码所使用的物理随机接入信道 PRACH资源的 PRACH掩码编号 PI ACII Mask Index参数中,并将该 PRACH Mask Index参数发送给所述终端。
3、 如权利要求 2所述的方法, 其特征在于, 所述基站将所述上行成员载 波的标识信息携带在所述 PRACH Mask Index参数中包括:
所述基站将由整数表示的所述 PRACH Mask Index参数转换为由二进制 表示的 PRACH Mask Index参数;
在所述由二进制表示的 PRACH Mask Index参数中增加载波指示域,以二 进制表示所述上行成员载波的标识信息后将该信息添加在所述载波指示域 中。
4、如权利要求 3所述的方法,其特征在于,在所述由二进制表示的 PRACH Mask Index参数的头部或尾部增加所述载波指示域。
5、 如权利要求 1-4中任一所述的方法, 其特征在于, 所述基站确定终端 发送随机接入前导码所使用的上行成员载波包括:
所述基站将所述终端的上行主载波确定为该终端发送随机接入前导码所 使用的上行成员载波; 或者,
所述基站根据预先设定的上下行成员载波之间的绑定关系以及基站发送 第一消息使用的下行成员载波, 确定所述终端发送随机接入前导码所使用的 上行成员载波;所述第一消息为基站发送 PRACH Mask Index参数所利用的消 息; 或者,
所述基站根据当前***支持的多个上行成员载波的负载信息从该多个上 行成员载波中选择一个上行成员载波作为所述终端发送随机接入前导码所使 用的成员载波。
6、 一种发送随机接入前导码的方法, 其特在于, 包括:
终端获取基站指示的承载随机接入前导码的上行成员载波的标识, 从多 个上行成员载波中确定该载波标识对应的一个上行成员载波;
终端通过确定的一个上行成员栽波发送随机接入前导码。
7、 如权利要求 6所述的方法, 其特征在于, 所述终端获取基站指示的承 载随机接入前导码的上行成员载波的标识, 包括:
终端从指示发送随机接入前导码所使用的物理随机接入信道( PRACH ) 资源的 PRACH掩码编号 ( PRACH Mask Index )参数中获取上行成员载波的 标识。
8、 一种随机接入前导码的发送***, 其特征在于, 该***包括: 基站, 用于确定终端发送随机接入前导码所使用的上行成员载波, 将所 述上行成员载波的标识信息发送给终端;
终端, 用于从自身支持的多个上行成员载波中选取所述上行成员载波的 标识对应的成员载波, 并利用该成员载波发送随机接入前导码。
9、 如权利要求 8所述的***, 其特征在于, 所述基站用于:
将所述上行成员载波的标识信息携带在用于指示所述终端发送随机接入 前导码所使用的物理随机接入信道 PRACH资源的 PRACH掩码编号 PRACH Mask Index参数中, 并将该 PRACH Mask Index参数发送给所述终端;
所述终端用于:
从所述 PRACH Mask Index参数中获取所述上行成员载波的标识信息。
10、 如权利要求 8或 9所述的***, 其特征在于, 所述基站用于: 员载波; 或者, 根据预先设定的上下行成员载波之间的绑定关系以及基站发送第一消息 使用的下行成员载波, 确定所述终端发送随机接入前导码所使用的上行成员 载波;所述第一消息为基站发送 PRACH Mask Index参数所利用的消息;或者, 根据当前***支持的多个上行成员载波的负载信息从该多个上行成员载 波中选择一个上行成员载波作为所述终端发送随机接入前导码所使用的成员 载波。
11、 一种基站, 其特征在于, 该基站包括:
载波确定单元, 用于确定终端发送随机接入前导码所使用的上行成员载 波;
信息发送单元, 用于将所述上行成员载波的标识信息发送给所述终端, 导码。
12、 如权利要求 11所述的基站, 其特征在于, 所述信息发送单元包括: 信息携带单元, 用于将所述上行成员载波的标识信息携带在用于指示所 述终端发送随机接入前导码所使用的物理随机接入信道 PRACH 资源的 PRACII掩码编号 PRACH Mask Inde 参数中;
参数发送单元, 用于将所述 PRACH Mask Index参数发送给所述终端。
13、 如权利要求 12所述的基站, 其特征在于, 所述信息携带单元用于: 将由整数表示的所述 PRACH Mask Index 参数转换为由二进制表示的
PRACH Mask Index参数; 在所述由二进制表示的 PRACH Mask Index参数中 增加载波指示域, 以二进制表示所述上行成员载波的标识信息后将该信息添 加在所述载波指示域中;
所述参数发送单元用于:
将携带所述载波指示域的 PRACH Mask Index参数发送给所述终端。
14、 如权利要求 11-13中任一所述的基站, 其特征在于, 所述载波确定单 元包括第一确定单元、 第二确定单元、 第三确定单元中的一个或任意组合: 所述第一确定单元, 用于将所述终端的上行主载波确定为该终端发送随 机接入前导码所使用的上行成员载波;
所述第二确定单元, 用于根据预先设定的上下行成员载波之间的绑定关 系以及基站发送第一消息使用的下行成员载波, 确定所述终端发送随机接入 前导码所使用的上行成员载波; 所述第一消息为基站发送 PRACH Mask Index 参数所利用的消息;
所述第三确定单元, 用于 ^据当前***支持的多个上行成员载波的负载 信息从该多个上行成员载波中选择一个上行成员载波作为所述终端发送随机 接入前导码所使用的成员载波。
15、 一种终端, 其特征在于, 该终端包括:
信息接收单元, 用于接收基站发来的上行成员载波的标识信息; 前导码发送单元, 用于从自身支持的多个上行成员载波中选取所述上行 成员载波的标识对应的成员载波, 并利用该成员载波发送随机接入前导码。
16、 如权利要求 15所述的终端, 其特征在于, 所述信息接收单元包括: 参数接收单元, 用于接收所述基站发来的用于指示本终端发送随机接入
Mask Index参数;
信息读取单元,用于从所述 PRACH Mask Index参数中读取所述上行成员 载波的标识信息。
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