WO2007009370A1 - Méthode pour établir des canaux de trafic inverse et terminal d’accès - Google Patents

Méthode pour établir des canaux de trafic inverse et terminal d’accès Download PDF

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Publication number
WO2007009370A1
WO2007009370A1 PCT/CN2006/001730 CN2006001730W WO2007009370A1 WO 2007009370 A1 WO2007009370 A1 WO 2007009370A1 CN 2006001730 W CN2006001730 W CN 2006001730W WO 2007009370 A1 WO2007009370 A1 WO 2007009370A1
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WO
WIPO (PCT)
Prior art keywords
reverse
message
traffic channel
access terminal
channel
Prior art date
Application number
PCT/CN2006/001730
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English (en)
French (fr)
Inventor
Peng Li
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to KR1020087003368A priority Critical patent/KR101205142B1/ko
Publication of WO2007009370A1 publication Critical patent/WO2007009370A1/zh
Priority to US12/016,068 priority patent/US20080112383A1/en
Priority to US13/492,102 priority patent/US20120243493A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1438—Negotiation of transmission parameters prior to communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70718—Particular systems or standards
    • H04B2201/70719—CDMA2000
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/20—Negotiating bandwidth

Definitions

  • the present invention relates to the field of communications, and in particular, to a reverse channel establishment method and an access terminal in a multi-carrier wireless communication system. Background technique
  • the existing CDMA2000 lxEV-DO (Evolution-Data Optimization) system adopts single-carrier transmission, and the development of data services makes people need higher data transmission rates.
  • 3GPP2 proposes a new air interface evolution plan, and its first phase adopts multiple The carrier EV-DO (NxEV-DO) is used to achieve a large increase in the air interface data rate, and it is required to achieve a forward rate of not less than N times 3.1 Mbps, and a reverse rate of not less than N times ⁇ 1.8 Mbps, where N is an access network ( AN) or the number of carriers used by the access terminal (AT).
  • AN access network
  • AT access terminal
  • the forward carrier and the reverse carrier can be dynamically and independently allocated through the cooperation of the AN and the AT, and the number of carriers in the front reverse direction does not necessarily require symmetry.
  • the AT uses only one reverse carrier link to transmit information, and the AT does not have the function of requesting a reverse traffic channel.
  • FIG. 1 it is a structural diagram of the lxEV-DO system, in which the transmitting tower to the AT is a forward carrier, and the AT to the transmitting tower is a reverse carrier.
  • the sections are as follows:
  • AN is a network device that provides data connectivity between a packet data network (such as the Internet) and the AT, which is equivalent to a base station in a CDMA2000 system.
  • a packet data network such as the Internet
  • PCF Packet Control Function Unit
  • the PCF mainly provides mapping of wireless links and wired links, call control, mobility management, session management, data buffering and forwarding, and collection of billing information.
  • Packet Data Service Node The PDSN mainly provides functions such as link management, mobility management, address allocation, billing information collection, data routing and tunnel encapsulation, and supports the external proxy function of Mobile lP.
  • MSC Mobile Switching Center
  • the AT needs to establish a connection when performing configuration negotiation and establishing a traffic channel. It mainly includes the following situations:
  • the AT initiates a connection request.
  • the AN sends a paging message, and the AT initiates a connection request after receiving the message.
  • FIG. 2 it is a schematic diagram of a message flow in which the AT actively initiates a connection request. As can be seen from FIG. 2, the following steps are mainly included.
  • the AT sends a connection request and starts a timer.
  • the AT sends a route update message indicating the wireless environment.
  • the AN sends a MAC layer acknowledgement message, and the acknowledgement message is received.
  • the AN sends a channel assignment message.
  • the AT establishes a reverse traffic channel, and sends a pilot and a DRC signal.
  • the AN sends an RTC ACK message to confirm that the reverse traffic channel is received.
  • the AT sends a channel establishment complete message on the service channel, and the timer is turned off.
  • the AT does not have the ability to request the reverse carrier from the AN.
  • the AN does not know the number of reverse carrier links that the AT expects.
  • the AT can only allocate one reverse carrier link with a peak rate of only 1.8 Mbps.
  • the present invention provides a multi-carrier EV-DO reverse carrier request method and an access terminal, which are used to solve
  • the AT existing in the prior art does not have the capability of autonomously requesting a reverse carrier from the AN and the problem that the AN cannot confirm the reverse carrier capability required by the AT.
  • a reverse channel establishing method includes the following steps:
  • the access terminal sends a carrier request message to the access network, where the carrier request message carries a reverse carrier request identifier, and identifies the number of reverse carrier links required by the access terminal;
  • the access network sends a service channel assignment message to the access terminal, where the service channel assignment message carries reverse traffic channel information;
  • the access terminal establishes a reverse traffic channel according to the service channel assignment message, and sends a pilot and data rate control signal;
  • the access terminal transmits a channel setup complete message on the reverse traffic channel and uses the channel to transmit data.
  • the reverse channel request message is sent on an access channel of the access terminal.
  • the carrier request message is sent on the reverse service channel that the access terminal and the access network have established.
  • the carrier request message is obtained by extending a routing update message.
  • the reverse carrier request field is added in the route update message.
  • the access terminal sends a carrier request message to the access network, including the message identifier, the transaction identifier, and the reverse link carrier number identifier.
  • the step of the access terminal in the sending a channel setup complete message in the reverse traffic channel further includes:
  • the access network sends a reverse traffic channel acknowledgement message confirming receipt of the reverse traffic channel.
  • the step of the access terminal in the sending a channel setup complete message in the reverse traffic channel further includes:
  • the access terminal transmits a reverse traffic channel setup complete message on the newly established reverse traffic channel. And the step of: sending the carrier request message to the access network, the step of starting the timer, where the access terminal sends the channel establishment complete message in the reverse traffic channel After the completion message is established to the traffic channel, the timer is turned off.
  • the access terminal in the reverse traffic channel transmission channel setup complete message step, the access terminal simultaneously transmits data on the existing reverse traffic channel and the newly established reverse traffic channel.
  • An access terminal comprising a terminal body, further comprising: a reverse traffic channel establishment control unit and a carrier request message sending unit;
  • the carrier request message sending unit sends a carrier request message to the access network according to the control signal sent by the reverse traffic channel establishment control unit, where the carrier request message carries a reverse carrier request
  • the identifier identifies the number of reverse carrier links required by the access terminal; the reverse traffic channel establishment control unit receives the transmission service channel assignment message sent by the access network, and establishes according to the service channel assignment message.
  • the reverse traffic channel of the access terminal sends a carrier request message to the access network according to the control signal sent by the reverse traffic channel establishment control unit, where the carrier request message carries a reverse carrier request
  • the identifier identifies the number of reverse carrier links required by the access terminal; the reverse traffic channel establishment control unit receives the transmission service channel assignment message sent by the access network, and establishes according to the service channel assignment message.
  • the reverse traffic channel of the access terminal is not limited to the access terminal.
  • the access terminal further includes:
  • the reverse traffic channel setup complete message sending unit is configured to send a reverse traffic channel setup complete message on the newly established reverse traffic channel.
  • the access terminal further includes:
  • the timer unit is configured to perform timing on the reverse channel connection establishment after sending the carrier request message.
  • the AT initiates a carrier request message to apply for a reverse carrier link to the AN;
  • the message contains the number of reverse carrier links that the AT wishes to allocate;
  • the message sent by the AT to the AN requesting the reverse carrier link can be sent either on the access channel or on the reverse traffic channel.
  • FIG. 1 is a structural diagram of a multi-carrier EV-DO system in the prior art
  • FIG. 2 is a schematic flowchart of a connection initiation request initiated by an AT in the prior art
  • FIG. 3 is a structural block diagram of an access terminal according to the present invention.
  • Figure 5 is a schematic flow chart of the example 2 of the actual travel of the present invention.
  • FIG. 6 is a schematic flow chart of Embodiment 3 of the present invention. detailed description
  • the technical solution of the present invention is used in the NxEV-DO system, and also satisfies the backward compatibility with the lxEV-DO system, and is improved on the basis of the C.S0024-A-V1.0 protocol specification.
  • the AT adds two logical functional units on the basis of the existing terminal body: a reverse traffic channel establishment control unit and a carrier request message sending unit.
  • the AT uses the functional unit to exchange a carrier request message with the AN, and controls the AT to establish a reverse traffic channel.
  • the carrier request message sending unit sends a carrier request message to the AN according to the control signal sent by the reverse traffic channel establishment control unit, where the carrier request message carries a reverse carrier request identifier, and the identifier The number of reverse carrier links required by the access terminal;
  • the reverse traffic channel establishment control unit receives the transmit traffic channel assignment message sent by A, and establishes a reverse traffic channel of the AT according to the traffic channel assignment message.
  • the above AT can also be set:
  • the reverse traffic channel setup complete message sending unit is configured to send a reverse traffic channel setup complete message on the newly established reverse traffic channel.
  • a timer unit configured to calculate a reverse channel connection establishment after sending a carrier request message Time.
  • the present invention sets a carrier request message, which carries a reverse carrier request identifier, and identifies the number of reverse carrier links required by the AT.
  • the AT sends the message to the AN to request the reverse The number of carriers.
  • Table 1 Carrier Request Message Field Information
  • Message ID Message ID, AT sets this field, each message corresponds to a unique Message ID, used to distinguish different messages.
  • Transaction ID Transaction ID
  • AT sends a new Reverse Channel each time
  • the receiving end receives the Reverse Channel Request Message, it can determine whether it is a new Reverse Channel Request Message according to the field. If it is not a new Reverse Channel Request Message, can not be processed, for the new Reverse Channel Request Message, the corresponding traffic channel is allocated for the AT.
  • Num Reverse Channels AT sets this field to the number of reverse link carriers it requests to be decremented by one. This field allows you to identify the number of reverse link carriers required by the AT.
  • Channel Identifies on which channel the message can be sent, for example on the access channel and the reverse traffic channel.
  • SLP Identifies that the message is sent in a best effort manner. In this way, the message is only transmitted once and may be lost during transmission.
  • Priority Identifies the priority at which the message is sent. The smaller the number, the higher the priority.
  • Embodiment 1 The AT actively initiates a request in an idle state.
  • Embodiment 1 is that the AT actively initiates a request in an idle state.
  • Embodiment 1 of the present invention mainly includes the following steps:
  • Sl l AT sends a CarrierRequest message on the access channel to request the AN for the number of reverse carrier links it expects.
  • the S12 AN sends a traffic channel assignment message containing specific information of the forward and reverse channels.
  • the information packet containing the channel in this message is roughly as follows:
  • the forward channel information should include the carrier frequency of the forward carrier link, the sector information of the channel to be transmitted, the MAC index information assigned to the AT (used to identify the data packet sent to the AT), and the like.
  • the reverse channel information should include the carrier frequency of the reverse carrier link, the MAC index information of the power control channel used to control the transmit power of the reverse channel, the forward channel index information of the power control channel, and the like. 513.
  • the AT establishes a newly assigned reverse traffic channel according to the content provided by the traffic channel assignment message, and sends its pilot and DRC signals.
  • the reverse pilot is mainly used to help the AN capture the reverse channel.
  • the DRC channel is the data rate control channel that the AT sends to tell the AN the rate of its requested forward traffic channel and its selected serving sector.
  • the AN sends an RTC ACK message to confirm receipt of the reverse traffic channel.
  • the AT sends a channel setup complete message on the reverse traffic channel, and the timer is turned off.
  • the AT will start a timer when sending a connection request. If the connection can be established within the time specified by the timer, the timer is turned off. Otherwise, the timer will time out and the AT will go to another state.
  • Embodiment 2 The AT initiates a request in a service state.
  • Embodiment 2 is that the AT is in the service state to initiate a request.
  • Embodiment 2 of the present invention mainly includes the following steps:
  • the data exchange is performed on the service channel originally established by the AT and the AN.
  • the AT sends a CarrierRequest message on the original reverse traffic channel to request the number of reverse carrier links it expects from the AN.
  • the AN sends a traffic channel assignment message, and includes specific information of the forward and reverse traffic channels.
  • the AT establishes a newly assigned reverse traffic channel according to the content provided by the traffic channel assignment message, and sends its pilot and DRC signals.
  • the AN sends an RTC ACK message, and confirms that the reverse traffic channel is received.
  • the AT sends a channel setup complete message on the reverse traffic channel, and the timer is turned off.
  • Embodiment 3 is to extend the Route Update Message in C.S0024-A-V1.0 to implement the function that the AT can actively request the reverse carrier from the AN.
  • Embodiment 3 is modified on the basis of C.S0024-A-V1.0, and the CairierRequest field is added.
  • the field is set to " ⁇ "
  • the message is used to request the AN to request the reverse carrier number of the AT. So Num Channels is the number of reverse carriers requested by the AT.
  • Num Pilots is set to "0000", and the corresponding pilot information field under Num Pilots is not included in the message.
  • the AN After receiving the message, the AN will reply with a Traffic Channel. Assignment message, the Traffic Channel
  • the Assignment message contains specific information about the reverse channel that the AN assigns to the AT. If the route is updated The Reverse Channel Included field of the message is set to "0", and the message has the same effect as the route update message defined in C.S0024-A-V1.0. At this point the Num Channels field will not be included in the message.
  • Embodiment 3 mainly includes the following steps:
  • the AT sends a Route Update message on the reverse traffic channel to request the AN to request the number of reverse carrier links.
  • the carrierRequest field of the message is "1"
  • the Num Pilots is set to "0000”
  • the pilot information field corresponding to the Num Pilots ie, the Pilot PN Phase, Reverse Channel Included ⁇ ChanneK Pilot Strengths Keep field
  • the Num Channels field is set to the number of reverse carriers requested by the AT.
  • the AN sends a traffic channel assignment message, and includes specific information of the forward and reverse channels.
  • the AT establishes a newly assigned reverse channel according to the content provided by the traffic channel assignment message, and sends its pilot and DRC signals.
  • the AN sends an RTC ACK message, and confirms that the reverse traffic channel is received.
  • the AT sends a channel setup complete message on the reverse traffic channel, and the timer is turned off.
  • the technical solution of the present invention allows the AT to actively request the number of reverse carriers required by the AT according to its own needs, so that the AT can dynamically and flexibly request the reverse carrier according to its own needs. In the business process, it can effectively handle bursty data services.
  • the spirit and scope of the invention Thus, it is intended that the present invention cover the modifications and variations of the inventions

Description

一种反向信道建立方法及接入终端 技术领域
本发明涉及通信领域， 尤其涉及一种多载波无线通信系统中反向信道建 立方法及接入终端。 背景技术
现有的 CDMA2000 lxEV-DO (演进 -数据优化） 系统采用的单载波传输， 数据业务的发展使人们需要更高的数据传输速率， 3GPP2提出了新的空口演进 计划， 其第一阶段通过采用多载波 EV-DO(NxEV-DO)来实现空口数据速率的 大幅度提高， 要求达到前向速率不小于 N倍的 3.1Mbps， 反向速率不小于 N倍 ^ 1.8Mbps, 其中 N为接入网络（AN )或接入终端 ( AT )采用的载波个数。 而且要求通过 AN与 AT协同工作，实现前向载波和反向载波能够动态独立的进 行分配， 前反向的载波数不一定要求对称。
然而现有的 lxEV-DO系统中， AT只使用一个反向载波链路传送信息， 而 且 AT不具备请求反向业务信道的功能。
如图 1所示， 是 lxEV-DO系统结构图， 其中发射塔至 AT为前向载波， AT 至发射塔为反向载波。 各部分所述如下：
接入网络（AN )： AN是在分组数据网 （如 Internet )和 AT之间提供数据 连接的网络设备， 相当于 CDMA2000系统中的基站。
分组控制功能单元（PCF )： PCF主要提供无线链路与有线链路的映射、 呼叫控制、 移动性管理、 会话管理以及数据緩冲与转发、 计费信息搜集等功 能。
分组数据服务结点（PDSN )： PDSN主要提供链路管理、 移动性管理、 地址分配、 计费信息搜集、 数据路由与隧道封装等功能， 同时支持 Mobile lP 的外部代理功能。 计费， 鉴权， 授权服务器（AAA服务器）： 主要提供身份认证与地址分 配功能。
移动交换中心（MSC )：电路域语音交换中心， 通过它连接电路域语音业 务。
在现有的 IxEV-DO系统中， AT在进行配置协商， 以及建立业务信道的时 候， 都需要建立连接。 主要包括以下几种情况：
1、 AT主动发起连接请求。
2、 AN发送寻呼消息， AT收到该消息后发起连接请求。
3、 会话初始建立， 需要配置协商的时候。
如图 2所示， 是 AT主动发起连接请求的消息流程示意图， 从图 2中可见， 主要包括以下步骤。
501、 AT发出连接请求， 开启定时器。
502、 AT发送路由更新消息， 指示无线环境。
503、 AN发送 MAC层确认消息， 确认消息收到。
504、 AN发信道指配消息。
505、 AT建立反向业务信道， 发送导频以及 DRC信号。
506、 AN发 RTC ACK消息， 确认反向业务信道收到。
507、 AT在业务信道发送信道建立完成消息， 关闭定时器。
508、 AT与 AN开始进行数据交换。
从上述方案可以发现， 现有技术具有如下缺点：
1、 AT不具备自主向 AN请求反向载波的能力。
2、 AN不知道 AT所希望得到的反向载波链路个数。
3、 AT只能分配一个反向载波链路， 其峰值速率仅为 1.8Mbps。
4、 前反向数据速率不能满足未来业务的需求。 发明内容
本发明提供一种多载波 EV-DO反向载波请求方法及接入终端， 用以解决 现有技术中存在的 AT不具备自主向 AN请求反向载波的能力以及 AN无法确 认 AT需要的反向载波能力的问题。
一种反向信道建立方法， 包括以下步骤：
接入终端向接入网发送载波请求消息， 所述载波请求消息中携带有反向 载波请求标识， 标识出接入终端需要的反向载波链路数量；
接入网向接入终端发送业务信道指配消息， 所述的业务信道指配消息中， 携带反向业务信道信息；
接入终端根据所述的业务信道指配消息建立反向业务信道， 并发送导频 及数据速率控制信号；
接入终端在反向业务信道发送信道建立完成消息， 并使用该信道传输数 据。
所述的接入终端向接入网发送载波请求消息步骤中， 所述的反向信道请 求消息， 是在接入终端的接入信道上发送。
所述的接入终端向接入网发送载波请求消息步骤中， 所述的载波请求消 息， 是在接入终端与接入网已经建立的反向业务信道上发送。
所述的接入终端向接入网发送载波请求消息步骤中， 所述的载波请求消 息， 是对路由更新消息进行扩展而得到的。
所述的接入终端向接入网发送载波请求消息步骤中， 是在所述的路由更 新消息中， 增加反向载波请求字段。
所述的接入终端向接入网发送载波请求消息步骤中， 所述的反向载波请 求标识， 包括消息标识、 交易标识、 反向链路载波数量标识。
所述的接入终端在所述的反向业务信道发送信道建立完成消息步骤中， 还包括：
接入网发送反向业务信道应答确认消息， 确认收到所述的反向业务信道。 所述的接入终端在所述的反向业务信道发送信道建立完成消息步骤中， 还包括：
接入终端在新建立的反向业务信道发送反向业务信道建立完成消息。 所述的接入终端向接入网发送载波请求消息步骤中， 还包括开启定时器 的步骤， 所述的接入终端在所述的反向业务信道发送信道建立完成消息步骤 中， 当发送反向业务信道建立完成消息后， 关闭该定时器。
所述的接入终端在所述的反向业务信道发送信道建立完成消息步骤中， 接入终端在已经存在的反向业务信道和所述的新建立的反向业务信道上同时 传输数据。
一种接入终端， 包括终端本体， 其特征在于， 还包括反向业务信道建立 控制单元和载波请求消息发送单元；
所述的载波请求消息发送单元， 根据所述的反向业务信道建立控制单元 所发送的控制信号， 向所述的接入网发送载波请求消息， 所述载波请求消息 中携带有反向载波请求标识， 标识出接入终端需要的反向载波链路数量； 所述的反向业务信道建立控制单元接收接入网发送的发送业务信道指配 消息， 根据所述的业务信道指配消息， 建立接入终端的反向业务信道。
所述的接入终端， 还包括：
反向业务信道建立完成消息发送单元， 用于在新建立的反向业务信道发 送反向业务信道建立完成消息。
所述的接入终端， 还包括：
定时器单元， 用于在发送载波请求消息后， 对反向信道连接建立进行计 时。
本发明有益效果如下： '
1、 由 AT主动发起载波请求消息来向 AN申请反向载波链路；
2、 在消息中包含关于 AT希望分配的反向载波链路个数；
3、 当 AT处于空闲状态和连接状态下均可以发送请求反向载波链路的消 息；
4、 AT发送给 AN的请求反向载波链路的消息既可在接入信道上发送也 可以在反向业务信道上发送。 附图说明
图 1为现有技术中多载波 EV-DO系统结构图；
图 2为现有技术中， AT发起连接请求的流程示意图；
图 3为本发明接入终端的结构框图；
图 4为本发明实施例 1的流程示意图；
图 5为本发明实旅例 2的流程示意图；
图 6为本发明实施例 3的流程示意图。 具体实施方式
下面结合说明书附图来说明本发明的具体实施方式。
本发明的技术方案用于 NxEV-DO系统中， 同时也满足对 lxEV-DO系统 的后向兼容性， 在 C.S0024-A-V1.0协议规范的基础进行改进。
如图 3所示， 本发明的 AT的结构示意图， 从图中可见， AT在现有终端 本体基础上， 增加了两个逻辑功能单元： 反向业务信道建立控制单元和载波 请求消息发送单元。
AT利用所述的功能单元与 AN交互载波请求消息， 并控制 AT建立反向 业务信道。
该载波请求消息发送单元， 根据所述的反向业务信道建立控制单元所发 送的控制信号， 向所述的 AN发送载波请求消息， 所述载波渚求消息中携带 有反向载波请求标识， 标识出接入终端需要的反向载波链路数量；
该反向业务信道建立控制单元接收 A 发送的发送业务信道指配消息， 根据所述的业务信道指配消息， 建立 AT的反向业务信道。
上述 AT， 还可以设置：
反向业务信道建立完成消息发送单元， 用于在新建立的反向业务信道发 送反向业务信道建立完成消息。
定时器单元， 用于在发送载波请求消息后， 对反向信道连接建立进行计 时。
本发明设置一个载波请求消息（ CarrierRequest Message ), 在该载波请求 消息中携带有反向载波请求标识， 标识出 AT需要的反向载波链路数量； AT 发送该消息向 AN请求它所需要的反向载波个数。 表 1: 载波请求消息字段信息
Figure imgf000008_0001
字段解释：
Message ID: 消息标识， AT设置该字段， 每个消息对应一个唯一的 Message ID, 用来区分不同的消息。
Transaction ID: 交易标识， AT每次发送一个新的 Reverse Channel
Requested Message的时候都会增加该字段的值。
通过该字段， 可以区别出每次发送的 Reverse Channel Requested Message, 这样， 当接收端接收到 Reverse Channel Request Message时， 可以根据该字段 来判定是否是新的 Reverse Channel Request Message, 如果不是新的 Reverse Channel Request Message , 可以不予处理, 对于新的 Reverse Channel Request Message, 为 AT进行相应业务信道的分配。
Num Reverse Channels: AT设置该字段为它请求分配给它的反向链路载波 个数减 1。 通过该字段， 可以标识出 AT需要的反向链路载波个数。
Reserved: AT设置该字段为 0。 AN收到该消息的时候会忽略该字段。 表 2: 消息字段信息 信道 接入信道， 反向业务信道
寻址 单播
SLP 尽力而为
优先级 40 表 2中的信息字段是每个消息都包含的， 其中：
信道： 标识该消息可以在哪个信道上发送， 例如可在接入信道和反向业 务信道上发送。
寻址： 标识该消息是以单播方式发送而不是广播方式或多播方式。
SLP:标识该消息是尽力而为方式发送，在这种方式下该消息只被传一次， 有可能在传输过程中丟失。
优先级： 标识发送该消息的优先级， 数字越小优先级越高。 实施例 1: AT处于空闲状态下主动发起请求。
如图 4所示，是本发明实施例 1的流程示意图，实施例 1是 AT处于空闲状态 下主动发起请求， 从图 4中可见， 本发明实施例 1主要包括以下步骤：
Sl l、 AT在接入信道上发送 CarrierRequest消息向 AN请求它期望的反向 载波链路个数。
S12 AN发送业务信道指配消息， 包含前向和反向信道的具体信息。 该消息中包含信道的信息包大体如下：
前向信道信息应该包含前向载波链路的载波频率， 发送该信道的扇区信 息， 分配给 AT的 MAC索引信息（用来标识发送给该 AT的数据包）等。
反向信道信息应包含反向载波链路的载波频率， 用来控制该反向信道发 射功率的功率控制信道的 MAC索引信息， 发送该功率控制信道的前向信道索 引信息等。 513、 AT根据业务信道指配消息提供的内容建立新指配的反向业务信道， 并发送其导频及 DRC信号。
其中：
反向导频主要用来帮助 AN捕获反向信道。
DRC信道是数据速率控制信道， AT发送该信道用来告诉 AN它所请求的前 向业务信道的速率以及它所选定的服务扇区。
514、 AN发 RTC ACK消息， 确认收到该反向业务信道。
515、 AT在反向业务信道发送信道建立完成消息， 关闭定时器。
AT在发送连接请求的时候会开启一个定时器， 如果在定时器规定时间内 连接能够建立起来， 那么该定时器就被关闭。 否则， 定时器就超时， AT就会 转到另外一种状态下。
S 16、 AT与 AN开始在新指配的业务信道上进行数据交换。 实施例 2: AT在业务状态下发起请求。
如图 5所示，是本发明实施例 2的流程示意图，实施例 2是 AT处于业务状态 下发起请求， 从图 5中可见， 本发明实施例 2主要包括以下步驟：
521、 数据交换在 AT与 AN原先建立的业务信道的上进行。
522、 AT在原先的反向业务信道上发送 CarrierRequest消息向 AN请求它期 望的反向载波链路个数。
523、 AN发送业务信道指配消息， 包含前向和反向业务信道的具体信息。
524、 AT根据业务信道指配消息提供的内容建立新指配的反向业务信道， 并发送其导频及 DRC信号。
525、 AN发 RTC ACK消息， 确认收到该反向业务信道。
526、 AT在反向业务信道发送信道建立完成消息， 关闭定时器。
527、 AT与 AN开始在以前的和新指配的业务信道上同时进行数据交换。 实施例 3: 实施例 3是通过对 C.S0024-A-V1.0中的 Route Update Message进行扩展，以 实现 AT能够主动向 AN请求反向载波的功能。
表 3: 路由更新消息扩展
Figure imgf000011_0001
其中最后 3个字段信道为新添加的字段， （即 CarrierRequest, Num
Channels, Reserved)该消息的其他字段信息与 C.S0024-A-V1.0中该消息的字 段信息保持一致。
实施例 3在 C.S0024-A-V1.0基础进行修改， 增加了 CairierRequest字段， 当该字段置为 "Γ时， 说明该消息用来向 AN请求 AT所需要的反向载波数。 所以 Num Channels为 AT请求的反向载波个数。这时 Num Pilots置为 "0000", 并且 Num Pilots下面对应的导频信息字段都不包含在该消息里。 AN收到该消 息后会回复一条 Traffic Channel Assignment消息， 该 Traffic Channel
Assignment消息包含了 AN分配给 AT的反向信道的具体信息。若路由更新消 息的 Reverse Channel Included字段置为 "0", 则该消息与 C.S0024-A-V1.0里 定义的路由更新消息的作用一样。 这时 Num Channels字段将不被包含在该消 息里。
如图 6所示， 是本发明实施例 3的流程示意图， 从图 6中可见， 实施例 3主 要包括以下步骤：
S31、 AT在反向业务信道上发送 Route Update消息向 AN请求它期望的反向 载波链路个数。 其中， 该消息的 CarrierRequest字段为 "1", Num Pilots置为 "0000",并且 Num Pilots对应的导频信息字段（即 Pilot PN Phase、 Reverse Channel Included^ ChanneK Pilot Strengths Keep字段）都不包含在该消息里。 Num Channels字段设置为 AT请求的反向载波个数。
532、 AN发送业务信道指配消息， 包含前向和反向信道的具体信息。
533、 AT根据业务信道指配消息提供的内容建立新指配的反向信道， 并 发送其导频及 DRC信号。
534、 AN发 RTC ACK消息， 确认收到该反向业务信道。
535、 AT在反向业务信道发送信道建立完成消息， 关闭定时器。
536、 AT与 AN开始在以前的和新指配的业务信道上同时进行数据交换。 上述实施例 3, 是存在已经建立的反向业务信道， 该方案也可以应用于实 施例 1的情况下， 即 AT处于空闲状态下主动发起请求。
本发明技术方案可以让 AT根据自己的需求主动向 AN请求它所需要的反 向载波数， 使得 AT能够才艮据自己的需要动态的， 灵活的向 AN请求反向载波。 在业务过程中， 能够有效的处理突发的数据业务。 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、 一种反向信道建立方法， 其特征在于， 包括以下步骤：
接入终端向接入网发送载波请求消息， 所述载波请求消息中携带有反向 载波请求标识 , 标识出接入终端需要的反向载波链路数量；
接入网向接入终端发送业务信道指配消息， 所述的业务信道指配消息中， 携带反向业务信道信息；
接入终端根据所述的业务信道指配消息建立反向业务信道， 并发送导频 及数据速率控制信号；
接入终端在所述的反向业务信道发送信道建立完成消息， 并使用该信道 传输数据。
2、 如权利要求 1所述的方法， 其特征在于， 所述的接入终端向接入网发 送载波请求消息步骤中， 所述的载波请求消息， 是在接入终端的接入信道上 发送。
3、 如权利要求 1所述的方法， 其特征在于， 所述的接入终端向接入网发 送载波请求消息步骤中， 所述的载波请求消息， 是在接入终端与接入网已经 建立的反向业务信道上发送。
4、 如权利要求 1所述的方法， 其特征在于， 所述的接入终端向接入网发 送载波请求消息步骤中， 所述的载波请求消息， 是对路由更新消息进行扩展 而得到的。
5、 如权利要求 4所述的方法， 其特征在于， 所述的接入终端向接入网发 送载波请求消息步骤中， 是在所述的路由更新消息中， 增加反向载波请求字 段。
6、 如权利要求 1所述的方法， 其特征在于， 所述的接入终端向接入网发 送载波请求消息步骤中， 所述的反向载波请求标识， 包括消息标识、 交易标 识、 反向链路载波数量标识。
7、 如权利要求 1所述的方法， 其特征在于， 所述的接入终端在所述的反 向业务信道发送信道建立完成消息步骤中， 还包括：
接入网发送反向业务信道应答确认消息， 确认收到所述的反向业务信道。
8、 如权利要求 1所述的方法， 其特征在于， 所述的接入终端在所述的反 向业务信道发送信道建立完成消息步骤中， 还包括：
接入终端在新建立的反向业务信道发送反向业务信道建立完成消息。
9、 如权利要求 8所述的方法， 其特征在于， 所述的接入终端向接入网发 送载波请求消息步骤中， 还包括开启定时器的步骤， 所述的接入终端在所述 的反向业务信道发送信道建立完成消息步骤中， 当发送反向业务信道建立完 成消息后， 关闭该定时器。
10、 如权利要求 1 所述的方法， 其特征在于， 所述的接入终端在所述的 反向业务信道发送信道建立完成消息步骤中， 接入终端在已经存在的反向业 务信道和所述的新建立的反向业务信道上同时传输数据。
11、 一种接入终端， 包括终端本体， 其特征在于， 还包括反向业务信道 建立控制单元和载波请求消息发送单元；
所述的载波请求消息发送单元， 根据所述的反向业务信道建立控制单元 所发送的控制信号， 向接入网发送载波请求消息， 所述载波清求消息中携带 有反向载波请求标识， 标识出接入终端需要的反向载波链路数量；
所述的反向业务信道建立控制单元接收接入网发送的发送业务信道指配 消息， 根据所述的业务信道指配消息， 建立接入终端的反向业务信道。
12、 如权利要求 11所述的接入终端， 其特征在于， 还包括：
反向业务信道建立完成消息发送单元， 用于在新建立的反向业务信道发 送反向业务信道建立完成消息。
13、 如权利要求 11所述的接入终端， 其特征在于， 还包括：
定时器单元， 用于在发送载波请求消息后， 对反向信道连接建立进行计 时。
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