WO2011072524A1 - 一种监听控制信道的方法、系统及接入终端 - Google Patents

一种监听控制信道的方法、系统及接入终端 Download PDF

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Publication number
WO2011072524A1
WO2011072524A1 PCT/CN2010/074779 CN2010074779W WO2011072524A1 WO 2011072524 A1 WO2011072524 A1 WO 2011072524A1 CN 2010074779 W CN2010074779 W CN 2010074779W WO 2011072524 A1 WO2011072524 A1 WO 2011072524A1
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Prior art keywords
control channel
carrier
channel
message
listening
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PCT/CN2010/074779
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English (en)
French (fr)
Inventor
罗雪松
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中兴通讯股份有限公司
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Publication of WO2011072524A1 publication Critical patent/WO2011072524A1/zh

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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
    • H04L5/0091—Signaling for the administration of the divided path
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0096—Indication of changes in allocation
    • H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management

Definitions

  • the present invention relates to a wireless communication access technology, and in particular, to a method, system, and access terminal for an access terminal (AT, Access Terminal) to monitor a control channel in a multi-carrier wireless access network.
  • AT Access Terminal
  • a user can use multiple carriers simultaneously. Perform forward and reverse data transfers.
  • AT can use multiple carriers at the same time, it only listens to the control channel of one carrier, which is specified by the access network (AN, Access Network).
  • AN Access Network
  • the AT will initiate an indication of the monitoring channel media access control (MAC, Medium Access Control) layer protocol, and then trigger the SupervisionFailed indication. The abnormal connection is closed.
  • MAC Monitoring Channel media access control
  • the AT if the AT does not receive the overhead message on the control channel within 12 control channel periods, the AT initiates the SupervisionFailed indication of the overhead message protocol layer, thereby causing the AT to initiate a shutdown command through the route update protocol, and then to the connection.
  • the idle state of the state protocol causes the connection to close. An abnormal connection closure will result in an increase in the call drop rate of the entire network, disrupting the continuity of voice services, lowering the average rate of data services, and ultimately deteriorating the user experience. Therefore, these anomalies should be avoided in the wireless network.
  • the technical problem to be solved by the present invention is to provide a method, system, and access terminal for monitoring a control channel, which can fully utilize the multi-carrier service channel of the access terminal to implement monitoring of the control channel.
  • the present invention provides a method for monitoring a control channel, involving an access terminal (AT) and an access network (AN), the method comprising: When the AT finds that the forward carrier of the control channel fails to be monitored, it actively jumps to other forward carriers for monitoring of the control channel, and/or sends a forward channel removal message to the AN to inform the AN control channel of the failed forward carrier.
  • the method further comprises:
  • the AN After receiving the forward channel removal message, the AN updates the active set, and removes the forward carrier whose control channel intercepts the failure in the updated active set.
  • the AN After receiving the forward channel removal message, the AN updates the active set according to the available carrier resources, and removes the forward carrier that fails the control channel interception in the updated active set, and sends a traffic channel assignment message to the AT;
  • the AT listens to the control channel according to the forward carrier assigned in the traffic channel assignment message.
  • the forward carrier assigned in the traffic channel assignment message Preferably,
  • the carrier is selected as the forward carrier of the subsequent listening control channel.
  • the method further comprises:
  • the AN After receiving the forward channel removal message, the AN updates the active set, and removes the forward carrier whose control channel intercepts the failure in the updated active set.
  • the AN After receiving the forward channel removal message, the AN updates the active set according to the available carrier resources, and removes the forward carrier that fails the control channel interception in the updated active set, and sends a traffic channel assignment message to the AT;
  • the AT listens to the control channel according to the forward carrier assigned by the AN in the Traffic Channel Assignment message.
  • the forward carrier assigned by the AN Preferably,
  • the AT When the AT removes the message from the forward channel, the AT also sends a forward control channel listening indication message to the AN to indicate that the forward control carrier of the control channel is successful;
  • the AN sets the forward carrier indicated by the AT as the forward carrier of the AT subsequent listening control channel in the transmitted traffic channel assignment message.
  • the method further comprises: adding a definition of a forward channel removal message in the multi-carrier forward traffic channel medium access control (MAC) protocol, the definition including at least an identifier of the forward channel removal message and indicating that the interception fails Forward channel indication of the forward carrier.
  • MAC medium access control
  • the method further comprises: adding a definition of a forward control channel listening indication message in the multi-carrier forward traffic channel MAC protocol, the definition including at least an identifier of the forward control channel listening indication message and a used to indicate that the monitoring succeeds Indicates to the forward channel of the carrier.
  • an access terminal which is configured to: when the forward carrier monitoring of the control channel fails, actively jump to other forward carriers to perform monitoring of the control channel, and / / Send a forward channel removal message to the AN to inform the AN control channel to listen to the failed forward carrier.
  • the AT is further configured to: after receiving the traffic channel assignment message sent by the access network (AN), according to the forward carrier intercept control channel assigned in the traffic channel assignment message.
  • the AT is further configured to: when actively forwarding to other forward carriers for monitoring of the control channel, if the control channel can be successfully monitored on the skipped carrier, the carrier is selected as a subsequent monitoring.
  • the forward carrier of the control channel Preferably, the AT is further configured to: when transmitting the forward channel removal message, further send a forward control channel listening indication message to the AN to indicate that the control carrier successfully transmits the forward carrier.
  • the present invention provides a system for implementing a multi-carrier monitoring control channel, including an access terminal (AT) and an access network (AN), wherein: the AT is set to: in the forward direction of the control channel When the carrier sense fails, the controller actively forwards to the other forward carrier for monitoring the control channel, and/or sends a forward channel removal message to the AN to inform the AN control channel to monitor the failed forward carrier; the AN is set to: Update the active set after receiving the forward channel removal message, in the updated live The moving carrier removes the forward carrier that the control channel fails to monitor.
  • the AT access terminal
  • AN access network
  • the AN is further configured to: after receiving the forward channel removal message, update the active set according to the available carrier resources, and remove the forward carrier that fails the control channel interception in the updated active set, and send a traffic channel assignment message to the AT;
  • the AT is further configured to: monitor the control channel according to the forward carrier assigned in the traffic channel assignment message.
  • the forward carrier assigned in the traffic channel assignment message Preferably,
  • the AT is further configured to: after actively forwarding to the other carrier for monitoring of the control channel, if the control channel can be successfully monitored on the jumped carrier, the carrier is selected as the forward carrier of the subsequent intercept control channel.
  • the AN is further configured to: after receiving the forward channel removal message, update the active set according to the available carrier resources, and remove the forward carrier that fails the control channel interception in the updated active set, and send a traffic channel assignment message to the AT;
  • the AT is also set to: monitor the control channel according to the forward carrier assigned by the AN in the Traffic Channel Assignment message.
  • the AT is further configured to: when the message is sent to the forward channel, the forward control channel listening indication message is also sent to the AN to indicate the forward carrier that successfully monitors the control channel;
  • the AN is configured to set the forward carrier indicated by the AT to the forward carrier of the AT subsequent listening control channel in the traffic channel assignment message sent to the AT.
  • the respective definitions of the forward channel removal message and the forward control channel interception indication message need to be extended in the multi-carrier forward traffic channel medium access control (MAC) protocol, wherein: the definition of the forward channel removal message includes at least: An identifier of the forward channel removal message, and a forward channel indication of the forward carrier indicating the failure of the interception;
  • the definition of the forward control channel listening indication message includes at least: an identifier of the forward control channel listening indication message, and a forward channel indication for indicating the successful forward carrier.
  • the system, the terminal and the series thereof are provided by the present invention, when the AT does not receive the overhead control channel packet and/or the overhead message on the control channel within 12 control channel periods, seeking to listen to the control channel on other forward carriers.
  • the connection will be closed only if the control channels of all carriers fail to listen. Therefore, the EVDO RevB version supports the AT connection using the multi-carrier service channel to play its due effect, thereby greatly reducing the call drop rate of the entire network, trying to maintain the continuity of the voice service and the average rate of the data service, effectively Improve the user experience.
  • FIG. 1 is a flowchart of Embodiment 1 of a method for implementing a multi-carrier monitoring control channel according to the present invention
  • FIG. 2 is a flowchart of Embodiment 2 of a method for implementing a multi-carrier monitoring control channel according to the present invention
  • FIG. 4 is a flowchart of Embodiment 4 of a method for implementing a multi-carrier monitoring control channel according to the present invention
  • FIG. 4 is a flowchart of implementing a multi-carrier monitoring control channel according to the present invention
  • the preferred embodiment of the present invention is in the EVDO RevB version (EVDO Rev.B is a new version of 3G technology EVDO to be adopted by China Telecom, which can provide a maximum download speed of 9.3 Mbps and various 3G application services with low latency) , Supports AT to use multi-carrier traffic channels in one connection. For AT, this has the potential to support multi-carrier monitoring.
  • the protocol stipulates that the AT should listen to the control channel on a carrier designated by the AN; from the AT implementation of the protocol in the existing service, the AT does the same.
  • the carrier of the AT listening control channel fails in a multi-carrier AN, the corresponding forward carrier does not send a message, and the AT will not receive any forward message; or the carrier that the AT monitors the control channel is subjected to wireless interference, It will cause the quality of the forward air interface on the carrier to become extremely bad, and it is difficult for the AT to demodulate the forward signal. According to the current protocol and the implementation of the AT, these reasons still cause the AT to fail to receive the forward synchronization control channel packet within the specified time, thereby triggering the SupervisionFailed indication and closing the connection.
  • the AN does not know that the AN may still assign the problematic carrier as the control channel carrier of the AT, which causes the AT to repeatedly close the connection due to the SupervisionFailed indication. As a result, the user experience is further deteriorated. If the other carrier assigned by the AN to the AT works normally, the AT initiates the connection close only by the abnormal condition of one carrier, thereby failing to fully utilize the advantages of the multi-carrier system to improve the fault tolerance of the system, which will result in multiple unnecessary Connection closure and re-calling increase the overhead of the access channel, control channel, and may result in repeated calls and dropped calls on poor carriers.
  • the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The following examples are provided to illustrate and explain the present invention, and are not intended to limit the technical solutions of the present invention.
  • the AT forward control channel has a monitoring failure, and there are many possibilities: First, only the forward control channel of the carrier fails, and the forward and reverse traffic channels of the carrier work normally; Second, the monitoring forward control The carrier of the channel is subject to radio interference, or the AN fails on some carriers, causing these carriers to be unusable.
  • AN and AT supporting multi-carrier simultaneous operation establish multiple carriers in one connection, where AN transmits forward control channel message on each carrier; AT selects to send reverse signaling on any reverse carrier, AN selects in any one The forward carrier transmits forward signaling.
  • the AT should select a carrier different from the listening control channel as the carrier that initiates the reverse signaling.
  • the following embodiment shows that after the AT finds that the carrier that is listening to the control channel has failed to listen, the AT and/or the AN pass different processing methods, so that the AT can continue on other normal carriers. Monitor the control channel to ensure that the service continues normally.
  • Embodiment 1 The flow of the embodiment is as shown in FIG. 1 , and relates to an access terminal (AT ) and an access network ( AN ), and includes the following steps: Step 101: The AT discovers that the carrier channel of the control channel fails to be monitored; Step 102, AT to AN Sending a forward channel removal message to indicate that the AN listens to the forward carrier where the control channel fails; Step 103, after receiving the message, the AN updates the active set according to the available carrier resources, and removes the control channel before the control channel fails to be monitored in the updated active set.
  • the carrier; the above active set includes a set of pilots that are serving the AT, and these pilots are distinguished by a PN (Pseudo Random Sequence) offset and a CDMA channel.
  • Step 105 After receiving the traffic channel assignment message, the AT continues to monitor the control channel on the carrier assigned by
  • the AT indicates and requests the AN to remove the forward carrier that fails the control channel interception by using the Forward CDMA Channel DropRequest message of the multi-carrier forward traffic channel MAC protocol (ie, the forward channel removal message); after receiving the message, the AN according to the available carrier resources.
  • the situation removes the forward carrier that the AT request is removed from the active set. If the AN still has the available carrier, the active set of the AT is updated, and a new traffic channel assignment message is sent to the AT, and the AT needs to be monitored later in the message.
  • the SubActiveSetCarriesControlChannel field corresponding to the carrier of the channel is set to True to instruct the AT to listen to the control channel of the corresponding forward carrier.
  • the entire process is similar to switching on a traffic channel.
  • the current multi-carrier forward traffic channel MAC protocol does not have the above ForwardCDMAChannelDropRequest message, so this embodiment needs to add a supplementary definition to the protocol, as shown in Table 1. Table 1
  • the routing update message may also be sent to the AN, and the AN updates the active set according to the routing update message and the available carrier resources.
  • Embodiment 2 The flow of this embodiment is as shown in FIG. 2, and relates to an access terminal (AT) and an access network (AN), and includes the following steps: Step 201: The AT discovers that carrier sensing of the control channel fails; Step 202, AT to AN Sending a forward channel removal message to indicate that the AN is listening to the control channel The forward carrier where the failure is located; Step 203, after receiving the message, the AN updates the active set according to the available carrier resources, and removes the forward carrier that fails the control channel monitoring in the updated active set; Step 204, because the AN is on any carrier The control channel message is sent, so the AT actively jumps to other carriers for monitoring of the control channel. If the control channel can be successfully monitored on the carrier, the carrier is selected as the carrier of the subsequent listening control channel.
  • Step 201 The AT discovers that carrier sensing of the control channel fails; Step 202, AT to AN Sending a forward channel removal message to indicate that the AN is listening to the control channel The forward carrier where the failure is located; Step
  • the third embodiment is shown in FIG. 3, which relates to an access terminal (AT) and an access network (AN), and includes the following steps: Step 301: The AT finds that the carrier that is listening to the control channel fails to listen; The AT actively jumps to other carriers for monitoring of the control channel. If the control channel can be successfully monitored on the carrier, the carrier is selected as the carrier of the subsequent listening control channel.
  • This embodiment is an initiative for the AT to interact with the AN. Since the AN sends control channel messages on any of the carriers, doing so does not cause a service failure. Just from the protocol level, the AT does not listen to the control channel on the specified carrier as specified by the AN in the previous traffic channel assignment message.
  • the multi-carrier forward traffic channel MAC protocol does not reflect the impact point of implementing the constraint, that is, the implementation of this constraint does not have other effects, so from the perspective of the implementation of the service function, AT above active operation will not currently It is feasible to cause any malfunction.
  • Embodiment 4 The flow of the embodiment is as shown in FIG. 4, and relates to an access terminal (AT) and an access network (AN), and includes the following steps: Step 401: The AT finds that the carrier that is listening to the control channel fails to monitor. Step 402: The AT actively jumps to other carriers for monitoring of the control channel, if the carrier is on the carrier If the control channel can be successfully monitored, the control channel is continuously monitored on the carrier. Step 403: The AT sends a forward channel removal message to the AN (see Table 1), requesting the AN to remove the forward carrier that fails to monitor the control channel; 403 may be performed simultaneously with step 402.
  • AN see Table 1
  • Step 404 after receiving the forward channel removal message, the AN updates the active set of the AT according to the available carrier resource capability, and removes the forward carrier that fails to control the control channel in the updated active set. 405.
  • the AN sends a new traffic channel assignment message to the AT to notify the AT to listen to the carrier of the control channel.
  • Step 406 After receiving the traffic channel assignment message, the AT monitors the control channel according to the carrier assigned by the AN. This embodiment actually combines the third embodiment with the second embodiment, so that the AT can ensure that the carrier of the listening control channel is specified by the AN.
  • the fifth embodiment is as shown in FIG. 5, and relates to an access terminal (AT) and an access network (AN), and includes the following steps: Step 501: The AT finds that the carrier that is listening to the control channel fails to monitor. The AT actively jumps to another carrier to perform monitoring of the control channel. If the control channel can be successfully monitored on the carrier, the carrier is selected as the carrier of the subsequent listening control channel; Step 503, the AT sends the forward channel to the AN.
  • the AT finds that the carrier that is listening to the control channel fails to monitor.
  • the AT actively jumps to another carrier to perform monitoring of the control channel. If the control channel can be successfully monitored on the carrier, the carrier is selected as the carrier of the subsequent listening control channel; Step 503, the AT sends the forward channel to the AN.
  • the message and the forward control channel listening indication message requesting the AN to remove the forward carrier that fails to monitor the control channel, and instructing the AN to successfully monitor the forward carrier of the control channel; Step 504, after receiving the forward channel removal message, the AN receives the message Update the active set of the AT according to the available carrier resource capability, and remove the carrier that fails to listen to the control channel in the updated active set; Step 506, the AN sends a new traffic channel assignment message to the AT, and sets the carrier indicated by the AT as the AT subsequent intercept control. The carrier of the channel.
  • the AT needs to pass the Forward CDMA Channel Supervision message of the protocol, except that the AT indicates and requests the AN to remove the forward carrier that fails to control the control channel through the Forward CDMA Channel DropRequest message of the multi-carrier forward traffic channel MAC protocol.
  • the forward control channel listening indication message indicates the carrier that successfully listens to the control channel to the AN, so that the AN specifically specifies an available carrier to be used as the intercept control channel in the new traffic channel assignment message.
  • Carrier The current multi-carrier forward traffic channel MAC protocol does not have the above ForwardCDMAChannelSupervision message, so the present invention further defines the protocol, as shown in Table 3.
  • this embodiment allows the AT to suggest that the AN specifies an available forward carrier as the carrier of the intercept control channel, and thus has better interactivity with the AN. The problem continues due to the fact that another carrier specified by the AN is still faulty or has interference.
  • the carrier field of the designated AT listening control channel in the service channel assignment message of the AN is deleted, and the AT itself decides which carrier to listen to the control channel, that is, when the AT finds that a certain carrier control channel fails to listen, it turns to another carrier.
  • the control channel is monitored, and the connection is closed only when the control channel listening failure occurs on all carriers.
  • the AT finds that a certain carrier forward control channel fails to listen, and sends a forward channel removal to the AN.
  • This embodiment is actually combined with the third embodiment to specify the service channel assignment message of the AN.
  • the carrier field of the AT listening control channel is deleted, and it is entirely up to the AT itself to decide on which carrier to listen to the control channel.
  • This embodiment breaks the requirement that the AT must assign more flexibility to the AT according to the constraints of the carrier frequency monitoring control channel specified by the AN, thereby improving the fault tolerance of the system.
  • the present invention is directed to the foregoing method embodiments, and correspondingly, a system for implementing a multi-carrier monitoring control channel, including an access terminal (AT) and an access network (AN), where:
  • An AT configured to send a forward channel removal message to the AN when the forward carrier monitoring of the discovery control channel fails, to indicate a forward carrier that fails to listen to the control channel;
  • the AN is configured to update the active set according to the received message, and remove the forward carrier that the AT intercepts the control channel fails in the updated active set.
  • the AT When the AT detects that the forward carrier of the control channel fails to be monitored, the AT actively jumps to other carriers for monitoring of the control channel. If the control channel is successfully monitored on the hopped carrier, the carrier is selected as the subsequent listening control channel. Carrier. Alternatively, the AN updates the active set according to the available carrier resources, and simultaneously sends a traffic channel assignment message to the AT; the AT listens to the control channel according to the carrier assigned in the message.
  • the AT While transmitting the forward channel removal message to the AN, the AT also sends a forward control channel listening indication message to the AN to indicate that the AN is listening to the forward carrier of the control channel successfully; according to the carrier allocated in the traffic channel assignment message sent by the AN Listening to the control channel;
  • the AN sets the forward carrier indicated by the AT as the carrier of the AT subsequent listening control channel in the traffic channel assignment message sent to the AT.
  • the system, the AT and a series of the methods provided by the present invention enable the AT-connected EVDO RevB version to use the multi-carrier service channel to perform its due effect, thereby greatly reducing the entire network. Call rate, try to maintain the continuity of voice business and data industry The average rate of service to effectively improve the user experience.
  • the present invention provides a method, system, and access terminal for monitoring a control channel.
  • an AT detects that a forward carrier of a control channel fails to be monitored, it actively jumps to another forward carrier to perform monitoring of the control channel, and/or Or sending a forward channel removal message to the AN, so that the AT-supported connection in the EVDO RevB version uses the multi-carrier service channel to perform its due effect, thereby greatly reducing the call drop rate of the entire network, and trying to maintain the continuity of the voice service and The average rate of data traffic to effectively improve the user experience.

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Description

一种监听控制信道的方法、 系统及接入终端
技术领域 本发明涉及无线通信接入技术， 尤其涉及多载波的无线接入网中接入终 端 （ AT , Access Terminal )监听控制信道的方法、 系统及接入终端。
背景技术
在当前的码分多址（ CDMA, Code Division Multiple Access ) lx EV-DO (简称为 EVDO, Evolution Data Only )空中接口版本（ 3GPP2 C.S0024-B ) , 定义了一个用户可以使用多个载波同时进行前向和反向数据传输。 虽然 AT 可以同时使用多个载波， 但是只监听一个载波的控制信道， 这个载波由接入 网络（AN, Access Network )指定。 根据协议规定， 如果 AT在 12个控制信 道周期内没有收到同步控制信道包， 那么 AT将发起控制信道媒体接入控制 ( MAC, Medium Access Control )层协议的监听失败 ( SupervisionFailed )指 示， 进而引发异常的连接关闭。 类似地， 如果 AT在 12个控制信道周期内接 收不到控制信道上的开销消息， 会引发 AT 发起开销消息协议层的 SupervisionFailed指示， 由此引发 AT通过路由更新协议发起关闭命令， 进而 转入连接状态协议的空闲状态而导致连接关闭。 异常的连接关闭会导致整个网络掉话率增高 , 破坏语音业务的连续性、 拉低数据业务的平均速率， 并最终恶化用户的使用体验。 故这些异常在无线 网络中都是要尽力避免的。
发明内容 本发明所要解决的技术问题是提供一种监听控制信道的方法、 系统及接 入终端， 能够充分利用接入终端的多载波的业务信道实现控制信道的监听。 为了解决上述技术问题， 本发明提供了一种监听控制信道的方法， 涉及 接入终端 （AT )和接入网络（AN ) , 该方法包括： AT 发现控制信道的前向载波监听失败时， 主动转跳到其它前向载波上 进行控制信道的监听， 和 /或向 AN发送前向信道去除消息， 以告知 AN控制 信道监听失败的前向载波。 优选地， 该方法还包括：
AN收到前向信道去除消息后更新活动集， 在更新的活动集中去掉控制 信道监听失败的前向载波。
优选地 ,
AN收到前向信道去除消息后， 根据可用的载波资源更新活动集， 且在 更新的活动集中去掉控制信道监听失败的前向载波， 并向 AT发送业务信道 指派消息；
AT根据业务信道指派消息中指派的前向载波监听控制信道。 优选地 ,
AT 在主动转跳到其它载波上进行控制信道的监听后， 若在跳转到的载 波上能够成功地监听到控制信道， 则选择该载波作为后续监听控制信道的前 向载波。
优选地， 该方法还包括：
AN收到前向信道去除消息后更新活动集， 在更新的活动集中去掉控制 信道监听失败的前向载波。
优选地 ,
AN收到前向信道去除消息后， 根据可用的载波资源更新活动集， 且在 更新的活动集中去掉控制信道监听失败的前向载波， 并向 AT发送业务信道 指派消息；
AT根据 AN在业务信道指派消息中指派的前向载波监听控制信道。 优选地 ,
AT在发送前向信道去除消息时， 还向 AN发送前向控制信道监听指示 消息， 以指示监听控制信道成功的前向载波； AN在发送的业务信道指派消息中将 AT指示的前向载波设置为 AT后续 监听控制信道的前向载波。 优选地， 该方法还包括： 在多载波前向业务信道媒体接入控制（MAC )协议中添加前向信道去除 消息的定义， 该定义至少包括前向信道去除消息的标识和用于指示监听失败 的前向载波的前向信道指示。
优选地， 该方法还包括： 在多载波前向业务信道 MAC协议中添加前向控制信道监听指示消息的 定义， 该定义至少包括前向控制信道监听指示消息的标识和用于指示监听成 功的前向载波的前向信道指示。 为了解决上述技术问题， 本发明提供了一种接入终端（AT ) , 其设置成： 在控制信道的前向载波监听失败时， 主动转跳到其它前向载波上进行控制信 道的监听， 和 /或向所述 AN发送前向信道去除消息， 以告知 AN控制信道监 听失败的前向载波。 优选地， 所述 AT, 还设置成： 接收到接入网络（AN )发送的业务信道 指派消息后， 根据所述业务信道指派消息中指派的前向载波监听控制信道。 优选地， 所述 AT, 还设置成： 主动转跳到其它前向载波上进行控制信 道的监听时， 若在跳转到的载波上能够成功地监听到控制信道， 则选择该载 波作为后续监听控制信道的前向载波。 优选地， 所述 AT, 还设置成： 在发送前向信道去除消息时， 还向所述 AN发送前向控制信道监听指示消息， 以指示监听控制信道成功的前向载波。 为了解决上述技术问题， 本发明提供了一种实现多载波监听控制信道的 系统， 包括接入终端 （ AT )和接入网络（ AN ) , 其中： 所述 AT设置成： 在控制信道的前向载波监听失败时， 主动转跳到其它 前向载波上进行控制信道的监听， 和 /或向 AN发送前向信道去除消息， 以告 知 AN控制信道监听失败的前向载波； 所述 AN设置成： 在收到前向信道去除消息后更新活动集， 在更新的活 动集中去掉所述控制信道监听失败的前向载波。 优选地 ,
AN还设置成： 收到前向信道去除消息后， 根据可用的载波资源更新活 动集， 且在更新的活动集中去掉控制信道监听失败的前向载波， 并向 AT发 送业务信道指派消息；
AT还设置成： 根据业务信道指派消息中指派的前向载波监听控制信道。 优选地 ,
AT 还设置成： 在主动转跳到其它载波上进行控制信道的监听后， 若在 跳转到的载波上能够成功地监听到控制信道， 则选择该载波作为后续监听控 制信道的前向载波。
优选地 ,
AN还设置成： 收到前向信道去除消息后， 根据可用的载波资源更新活 动集， 且在更新的活动集中去掉控制信道监听失败的前向载波， 并向 AT发 送业务信道指派消息；
AT还设置成： 根据 AN在业务信道指派消息中指派的前向载波监听控 制信道。
优选地 ,
AT还设置成： 在发送前向信道去除消息时， 还向 AN发送前向控制信 道监听指示消息， 以指示监听控制信道成功的前向载波；
AN是设置成：在向 AT发送的所述业务信道指派消息中将 AT指示的前 向载波设置为 AT后续监听控制信道的前向载波。 优选地 , 前向信道去除消息和前向控制信道监听指示消息各自的定义需要在多载 波前向业务信道媒体接入控制 （MAC )协议中扩展， 其中： 前向信道去除消息的定义至少包括： 前向信道去除消息的标识， 以及用 于指示监听失败的前向载波的前向信道指示； 前向控制信道监听指示消息的定义至少包括： 前向控制信道监听指示消 息的标识， 以及用于指示监听成功的前向载波的前向信道指示。
本发明提供的系统、 终端及其一系列方法， 当 AT在 12个控制信道周期 内没有收到同步控制信道包和 /或控制信道上的开销消息时，寻求在其它前向 载波来监听控制信道， 只有在所有载波的控制信道都监听失败， 才会关闭连 接。 由此使得 EVDO RevB版本中支持 AT的连接使用多载波的业务信道发 挥出其应有的效力， 从而大大降低整个网络掉话率， 尽力保持语音业务的连 续性及数据业务的平均速率， 以有效地改善用户体验。
附图概述 图 1为本发明的实现多载波监听控制信道的方法实施例一的流程图； 图 2为本发明的实现多载波监听控制信道的方法实施例二的流程图； 图 3为本发明的实现多载波监听控制信道的方法实施例三的流程图； 图 4为本发明的实现多载波监听控制信道的方法实施例四的流程图； 图 5为本发明的实现多载波监听控制信道的方法实施例五的流程图。
本发明的较佳实施方式 在 EVDO RevB版本（EVDO Rev.B 是中国电信即将釆用的 3G技术 EVDO的新版本， 能够提供 9.3 Mbps的最高下载速度以及低时延的各种 3G 应用业务） 中， 支持 AT在一个连接中使用多载波的业务信道。 对于 AT而 言， 这就具备了支持多载波监听的可能性。 但从目前的 EVDO RevB版本的 协议上看， 该协议规定 AT应在 AN指定的一个载波上监听控制信道； 从现 有业务中的 AT对协议的执行情况上看， AT也确是如此做的， 尚未在协议定 义的范围之外自行进行提高连接可靠性或者容错能力的工作， 即 AT仍然只 是在一个载波上监听控制信道， 当在这个载波上出现上述的监听失败则关闭 连接， 这样会使得 AT 在对控制信道监控失败的处理能力仍然处于 EVDO RevA版本的单载波的水平上， 即没有发挥出监听多载波控制信道的效力。 如果在一个多载波的 AN中， AT监听控制信道的载波出现故障， 导致 对应的前向载波没有消息发出， AT将无法接收到任何前向消息； 或者 AT监 听控制信道的载波受到无线干扰， 将会导致该载波上的前向空口质量变为极 端恶劣， AT便难以解调出前向信号。 根据目前的协议和 AT的实现， 上述这 些原因仍然会导致 AT不能够在规定时间内收到前向同步控制信道包， 进而 触发 SupervisionFailed指示而关闭连接。 如果是由于前向无线干扰导致的关闭连接， AN并不知道，再次起呼 AN 仍然可能会指派有问题的载波作为 AT的控制信道载波， 这就会导致 AT反 复出现因 SupervisionFailed指示而关闭连接，从而导致用户体验进一步恶化。 如果 AN为 AT指派的其它载波工作正常， AT仅凭一个载波的异常情况 就发起连接关闭， 由此未能充分利用多载波系统的优势来提高系统的容错能 力， 这将导致多次不必要的连接关闭和重呼， 增加了接入信道、 控制信道的 开销， 并且可能会在恶劣的载波上出现反复地呼叫和掉话。 以下结合附图和优选实施例， 对本发明的技术方案进行详细地阐述。 以 下列举的实施例仅仅用于说明和解释本发明， 而不构成对本发明技术方案的 限制。
AT 前向控制信道出现监听失败， 有多种可能： 其一， 仅仅是载波的前 向控制信道出现故障， 而该载波的前向和反向业务信道工作正常； 其二， 是 监听前向控制信道的载波受到无线干扰， 或是 AN在部分载波上出现故障而 导致这些载波无法使用。 支持多载波同时工作的 AN和 AT在一个连接中建立多个载波，其中 AN 在每个载波都发送前向控制信道消息； AT 选择在任一个反向载波发送反向 信令， AN选择在任何一个前向载波发送前向信令。 为避免反向信令发送失败， AT 应尽可能地选择不同于监听控制信道的 载波作为发起反向信令的载波。 以下实施例表明，当 AT发现正在监听控制信道的载波出现监听失败后， AT和 /或 AN通过不同的处理方法， 使得 AT能够在其它正常的载波上继续 监听控制信道， 从而保证业务继续正常进行。
实施例一 本实施例流程如图 1所示， 涉及接入终端 （AT )和接入网络 ( AN ) , 包括如下步骤： 步骤 101 , AT发现控制信道的载波监听失败； 步骤 102, AT向 AN发送前向信道去除消息， 以指示 AN监听控制信道 失败所在的前向载波； 步骤 103 , AN收到该消息后根据可用的载波资源更新活动集，在更新的 活动集中去掉控制信道监听失败的前向载波； 上述活动集包括正在为 AT服务的一组导频， 这些导频通过 PN (伪随机 序列 )偏置和 CDMA信道来区分。 步骤 104, AN向 AT发送新的业务信道指派消息， 以通知 AT转而监听 控制信道的载波； 步骤 105, AT收到该业务信道指派消息后， 在 AN指派的载波上继续监 听控制信道。
在 此 ， AT 通 过 多 载 波前 向 业 务信 道 MAC 协议 的 ForwardCDMAChannelDropRequest消息（即前向信道去除消息）指示并请求 AN去掉控制信道监听失败的前向载波； AN收到该消息后，根据可用的载波 资源情况将 AT请求去掉的前向载波从活动集中去除， 如果 AN仍有可用的 载波则更新 AT的活动集， 并向 AT发送新的业务信道指派消息， 且在该消 息 中 将 AT 后 续 需 要 监 听 控 制 信 道 的 载 波 对 应 的 SubActiveSetCarriesControlChannel字段设置为 True , 以指示 AT监听对应的 前向载波的控制信道。 整个过程类似进行一次业务信道上的切换。 目 前的多 载波前向业务信道 MAC 协议中并没有上述的 ForwardCDMAChannelDropRequest 消息， 故本实施例需对该协议做补充定 义， 如表 1所示。 表 1
Figure imgf000010_0001
本发明在表 1 中用于指示请求去掉载波的原因的 ReasonCode字段定义 如表 2所示。 表 2
Figure imgf000010_0002
在 AT向 AN发送前向信道去除消息的同时， 还可以向 AN发送路由更 新消息， AN根据路由更新消息并结合可用的载波资源更新活动集。
实施例二 本实施例流程如图 2所示， 涉及接入终端 （AT )和接入网络 ( AN ) , 包括如下步骤： 步骤 201 , AT发现控制信道的载波监听失败； 步骤 202, AT向 AN发送前向信道去除消息， 以指示 AN监听控制信道 失败所在的前向载波； 步骤 203 , AN收到该消息后根据可用的载波资源更新活动集，在更新的 活动集中去掉控制信道监听失败的前向载波； 步骤 204, 由于 AN在任何一个载波都会发送控制信道消息， 故 AT主 动转跳到其它载波上进行控制信道的监听， 若在该载波上能够成功地监听到 控制信道， 则选择该载波作为后续监听控制信道的载波。
实施例三 本实施例流程如图 3所示， 涉及接入终端 （AT )和接入网络 ( AN ) , 包括如下步骤： 步骤 301 , AT发现正在监听控制信道的载波出现监听失败； 步骤 302, AT主动转跳到其它载波上进行控制信道的监听， 若在该载波 上能够成功地监听到控制信道，则选择该载波作为后续监听控制信道的载波。 本实施例是 AT不必与 AN进行交互的主动所为。 由于 AN在任何一个 载波都会发送控制信道消息， 因此这样做不会导致业务故障。 只是从协议层 次上讲， AT没有按照 AN在上一个业务信道指派消息的规定在规定的载波 上监听控制信道。 然而，多载波前向业务信道 MAC协议没有反映出实行该约束的影响点， 亦即不实行此约束并不会产生其它影响， 故从业务功能的实现上看， AT 上 述主动操作目前并不会引起任何故障， 因而是可行的。
实施例四 本实施例流程如图 4所示， 涉及接入终端 （AT )和接入网络 ( AN ) , 包括如下步骤： 步骤 401 , AT发现正在监听控制信道的载波出现监听失败； 步骤 402, AT主动转跳到其它载波上进行控制信道的监听， 若在该载波 上能够成功地监听到控制信道， 则继续在该载波上监听控制信道； 步骤 403 , AT向 AN发送前向信道去除消息（参见表 1 ) , 请求 AN去 掉控制信道监听失败的前向载波； 步骤 403可与步骤 402同时进行； 步骤 404, AN收到该前向信道去除消息后，根据可用的载波资源能力更 新 AT的活动集， 在更新的活动集中去掉控制信道监听失败的前向载波； 步骤 405 , AN向 AT发送新的业务信道指派消息， 以通知 AT转而监听 控制信道的载波； 步骤 406, AT收到该业务信道指派消息后， 按照 AN指派的载波监听控 制信道。 本实施例实际上是将实施例三与实施例二结合， 使得 AT能够保证监听 控制信道的载波是由 AN指定的。
实施例五 本实施例流程如图 5所示， 涉及接入终端 （AT )和接入网络 ( AN ) , 包括如下步骤： 步骤 501 , AT发现正在监听控制信道的载波出现监听失败； 步骤 502, AT主动转跳到其它载波上进行控制信道的监听， 若在该载波 上能够成功地监听到控制信道，则选择该载波作为后续监听控制信道的载波； 步骤 503 , AT向 AN发送前向信道去除消息及前向控制信道监听指示消 息， 请求 AN去掉控制信道监听失败的前向载波， 并指示 AN其能成功监听 控制信道的前向载波； 步骤 504, AN收到该前向信道去除消息后，根据可用的载波资源能力更 新 AT的活动集， 在更新的活动集中去掉监听控制信道失败的载波； 步骤 506, AN向 AT发送新的业务信道指派消息， 将 AT指示的载波设 置为 AT后续监听控制信道的载波。 在此， AT 除了 通过多 载波前向业务信道 MAC 协议的 ForwardCDMAChannelDropRequest消息指示并请求 AN去掉控制信道监听失 败的前向载波外， 还需通过该协议的 ForwardCDMAChannelSupervision消息
(即前向控制信道监听指示消息）将其成功监听控制信道的载波指示给 AN, 以便于 AN在新的业务信道指派消息中有针对性地指定一个 AT确认能用的 载波作为监听控制信道的载波。 目 前的多 载波前向业务信道 MAC 协议中并没有上述的 ForwardCDMAChannelSupervision 消息， 故本发明对该协议做进一步补充定 义， 如表 3所示。 表 3
Figure imgf000013_0001
本实施例与实施例四相比， 允许 AT建议 AN指定某个可用的前向载波 作为监听控制信道的载波， 因而与 AN的交互性更好。 避免了 AN指定的另 一个载波依然有故障或存在干扰而导致的问题延续。
实施例六 将 AN的业务信道指派消息中指定 AT监听控制信道的载波字段删除， 由 AT 自己决定在哪一个载波上监听控制信道， 即当 AT发现某个载波控制 信道监听失败， 则转向其它载波监听控制信道， 只有在所有载波都出现控制 信道监听失败， 才发起连接关闭。
AT发现某个载波前向控制信道监听失败， 向 AN发送前向信道去除消 本实施例实际上是与实施例三结合， 将 AN的业务信道指派消息中指定
AT监听控制信道的载波字段删除，完全由 AT自己决定在哪一个载波上监听 控制信道。 该实施例打破了要求 AT必须按照 AN指定的载频监听控制信道的约束， 将更大的灵活性交给 AT, 由此提高了系统的容错性。
本发明针对上述方法实施例， 还相应地提出实现多载波监听控制信道的 系统， 包括接入终端 （ AT )和接入网络（ AN ) , 其中：
AT, 其设置成在发现控制信道的前向载波监听失败时， 向 AN发送前向 信道去除消息， 以指示监听控制信道失败的前向载波；
AN, 其设置成根据收到的消息更新活动集， 在更新的活动集中去掉 AT 监听控制信道失败的前向载波。
AT 在发现控制信道的前向载波监听失败时， 主动转跳到其它载波上进 行控制信道的监听， 若在跳转到的载波上成功地监听到控制信道， 则选择该 载波作为后续监听控制信道的载波。 或者， AN根据可用的载波资源更新活动集， 同时向 AT发送业务信道 指派消息； AT根据该消息中指派的载波监听控制信道。
AT在向 AN发送前向信道去除消息的同时，还向 AN发送前向控制信道 监听指示消息， 以指示 AN其监听控制信道成功的前向载波； 按照 AN发送 的业务信道指派消息中指派的载波监听控制信道；
AN在向 AT发送的业务信道指派消息中将 AT指示的前向载波设置为 AT后续监听控制信道的载波。 综上实施例可以看出， 本发明提供的系统、 AT 及其一系列方法， 使得 EVDO RevB版本中支持 AT的连接使用多载波的业务信道发挥出其应有的 效力， 从而大大降低整个网络掉话率， 尽力保持语音业务的连续性及数据业 务的平均速率， 以有效地改善用户体验。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。 尽管本发明结合特定实施例进行了描述， 但是对于本领域的技术人员来 说， 可以在不背离本发明的精神或范围的情况下进行修改和变化。 这样的修 改和变化被视作在本发明的范围和附加的权利要求书范围之内。
工业实用性 本发明提供一种监听控制信道的方法、 系统及接入终端， 通过 AT发现 控制信道的前向载波监听失败时， 主动转跳到其它前向载波上进行控制信道 的监听， 和 /或向 AN发送前向信道去除消息， 使得 EVDO RevB版本中支持 AT 的连接使用多载波的业务信道发挥出其应有的效力， 从而大大降低整个 网络掉话率， 尽力保持语音业务的连续性及数据业务的平均速率， 以有效地 改善用户体验。

Claims

权 利 要 求 书
1、 一种监听控制信道的方法， 包括： 接入终端（AT )发现控制信道的前向载波监听失败时， 主动转跳到其它 前向载波上进行控制信道的监听， 和 /或向接入网络（AN )发送前向信道去 除消息， 以告知 AN控制信道监听失败的前向载波。
2、 按照权利要求 1所述的方法， 其中： 在 AT向 AN发送前向信道去除消息之后， 所述方法还包括： 所述 AN收到所述前向信道去除消息后更新活动集， 在更新的活动集中 去掉所述控制信道监听失败的前向载波。
3、 按照权利要求 2所述的方法， 其中 所述 AN收到所述前向信道去除消息后， 所述方法还包括： 所述 AN向所述 AT发送业务信道指派消息； 所述 AT根据所述业务信道指派消息中指派的前向载波监听控制信道。
4、 按照权利要求 1所述的方法， 其中： 所述 AT在主动转跳到其它载波上进行控制信道的监听后， 所述方法还 包括： 若在跳转到的载波上能够成功地监听到控制信道， 则选择该载波作为 后续监听控制信道的前向载波。
5、 按照权利要求 4所述的方法， 其中： 在 AT向 AN发送前向信道去除消息之后， 所述方法还包括： 所述 AN收到所述前向信道去除消息后更新活动集， 在更新的活动集中 去掉所述控制信道监听失败的前向载波。
6、 按照权利要求 5所述的方法， 其中： 所述 AN收到所述前向信道去除消息后， 所述方法还包括： 所述 AN向所述 AT发送业务信道指派消息； 所述 AT根据 AN在所述业务信道指派消息中指派的前向载波监听控制 信道。
7、 按照权利要求 6所述的方法， 其中： 所述 AT在发送所述前向信道去除消息时， 所述方法还包括： 所述 AT 向所述 AN发送前向控制信道监听指示消息， 以指示监听控制信道成功的前 向载波；
所述 AN在发送的所述业务信道指派消息中将所述 AT指示的监听控制 信道成功的前向载波设置为 AT后续监听控制信道的前向载波。
8、 按照权利要求 1至 7任一项所述的方法， 还包括： 在多载波前向业务信道媒体接入控制（MAC )协议中添加所述前向信道 去除消息的定义， 该定义至少包括所述前向信道去除消息的标识和用于指示 监听失败的前向载波的前向信道指示。
9、 按照权利要求 8所述的方法， 还包括： 在所述多载波前向业务信道 MAC协议中添加所述前向控制信道监听指 示消息的定义， 该定义至少包括所述前向控制信道监听指示消息的标识和用 于指示监听控制信道成功的前向载波的前向信道指示。
10、 一种接入终端（AT ) , 其设置成： 在控制信道的前向载波监听失败 时， 主动转跳到其它前向载波上进行控制信道的监听， 和 /或向所述 AN发送 前向信道去除消息， 以告知 AN控制信道监听失败的前向载波。
11、 如权利要求 10所述的 AT, 还设置成： 接收到接入网络（AN )发 送的业务信道指派消息后， 根据所述业务信道指派消息中指派的前向载波监 听控制信道。
12、 如权利要求 10所述的 AT, 还设置成： 主动转跳到其它前向载波上 进行控制信道的监听时， 若在跳转到的载波上能够成功地监听到控制信道， 则选择该载波作为后续监听控制信道的前向载波。
13、如权利要求 12所述的 AT,还设置成： 在发送前向信道去除消息时， 还向所述 AN发送前向控制信道监听指示消息， 以指示监听控制信道成功的 前向载波。
14、一种监听控制信道的系统， 包括如权利要求 10~ 13所述的接入终端 (AT)和接入网络（AN) , 其中： 所述 AN设置成： 在收到所述 AT发送的前向信道去除消息后更新活动 集， 在更新的活动集中去掉所述控制信道监听失败的前向载波。
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