WO2012037714A1 - 语音组呼上行的保护方法及系统 - Google Patents

语音组呼上行的保护方法及系统 Download PDF

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Publication number
WO2012037714A1
WO2012037714A1 PCT/CN2010/077138 CN2010077138W WO2012037714A1 WO 2012037714 A1 WO2012037714 A1 WO 2012037714A1 CN 2010077138 W CN2010077138 W CN 2010077138W WO 2012037714 A1 WO2012037714 A1 WO 2012037714A1
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WIPO (PCT)
Prior art keywords
uplink
message
detection
speaker
listener
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PCT/CN2010/077138
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English (en)
French (fr)
Inventor
赵峰丽
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to PCT/CN2010/077138 priority Critical patent/WO2012037714A1/zh
Publication of WO2012037714A1 publication Critical patent/WO2012037714A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/25—Maintenance of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast
    • H04W76/45—Connection management for selective distribution or broadcast for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services

Definitions

  • the present invention relates to an uplink detection technology in a voice group call service, and in particular, to a voice group call uplink protection method and system. Background technique
  • Voice Group Call Service also referred to as group call
  • group call is a kind of telecommunication service.
  • the group call service defines a point-to-multipoint voice communication method in which a plurality of parties participate, and some of them can speak and listen to each other. This business breaks through the limitations of peer-to-peer communication, enabling group calls to be established in a quick and easy manner, enabling functions such as dispatching commands and emergency notifications.
  • VGCS is like a meeting. At the same time, only one person can speak. Others act as listeners. When the speaking user ends the speech, other listeners can take up the speech.
  • the network side broadcasts the group call channel uplink busy message on the group call channel. Only after the uplink user releases the uplink, the uplink idle message is broadcasted on the group call channel. At this time, the listener user can apply for the uplink speaking right. If the network side authorizes the application user, the user can occupy the uplink to speak. At this time, the network side will send the uplink busy message to the other terminals again on each group call channel. .
  • the listener can only speak when the current speaking user gives up the uplink, and when the speaking user has some fault or the unnumbered acknowledgement (UA, Unnumbered Acknowledgment) message sent to the VGCS terminal is lost.
  • the network side cannot be notified to release the uplink. Since the network side does not know that the speaker has some kind of fault, the group call will not be released. At this time, the group call uplink state hangs, that is, no speaker speaks. And other listeners can't compete for the upside. Once this happens, not only will it cause a lot of waste of resources, but more importantly, it will lead to the failure of the entire dispatching system, and the consequences will be more serious. Therefore, aiming at the present Insufficient network, a protective measure is needed to avoid the hang of the uplink state on the network side due to problems such as terminal failure or message loss.
  • the Chinese Patent Application Publication No. CN1968460A which is issued on May 23, 2007, discloses a "method for releasing the voice group call uplink", and the patent application proposes to use the set permission.
  • the dispatcher releases the uplink.
  • the protection of the group call uplink state cannot be achieved.
  • the Chinese patent application with the publication date of December 27, 2006 and the publication number CN1885970A discloses a protection method and system after the service user occupies the group call uplink channel, and the patent application proposes an uplink speech after occupying the uplink.
  • the length of time specifically by the timer to limit the duration of the speaker's speech, if the timer duration is set too short, the speaker will be released as soon as the speaker has not finished speaking, which will bring inconvenience to the business; if the setting is too long, it will reach Not good uplink protection, for example, when the authorization message sent to the terminal is lost, If the network side has broadcasted the uplink busy message on the group call channel, the terminal that applied for the uplink talk right does not receive the network side message, and the network side does not authorize the network side. In fact, the network side has authorized the terminal, and The group call uplink busy message has been broadcasted on all the group call channels. Therefore, the status of the terminal and the network side is inconsistent.
  • the uplink can only be released after the timer expires.
  • the timer sets this. There was no speaker's speech during the period and the listener could not compete for the upside.
  • the technical solution is not very flexible, and it is necessary to send a message to the mobile switching center (MSC, Mobile Switching Center) to detect whether the state of the speaker user is normal after the timer expires, which obviously increases the processing complexity.
  • MSC Mobile Switching Center
  • the main purpose of the present invention is to provide a voice group call uplink protection method and system, which can detect the situation that the speaker occupies the uplink resource, determine the current fault of the speaker or the network side does not receive the speaker's uplink. When the resource release notification is issued, the uplink resource can also be released.
  • the technical solution of the present invention is achieved as follows:
  • a method for protecting a voice group call uplink where an uplink detection message for detecting whether the speaker releases the uplink resource and a response message of the uplink detection message (referred to as an uplink detection response message in the present invention) are set; the method further includes :
  • the uplink resource idle message is broadcasted on all voice group call channels.
  • the method is: sending an uplink detection message to the speaker periodically, and detecting whether the speaker returns a response message to the uplink detection message to confirm whether the speaker has released the uplink resource, specifically:
  • the uplink detection timer is started, and after the uplink detection timer expires, the uplink detection message is sent to the speaker, and the uplink detection response timer is started.
  • the uplink detection response timer After the uplink detection response timer expires, if the speaker does not receive the response message to the uplink detection message, it is further determined whether the timeout period of the uplink detection response timer exceeds the set threshold, when the threshold is exceeded. And confirming that the speaker has released the uplink resource, if the threshold value is not exceeded, resending the uplink detection message, and starting the uplink detection response timer; if the speaker receives the uplink detection The response message of the message restarts the uplink detection timer, and after the uplink detection timer expires, continues to send an uplink detection message to the speaker, and detects whether the speaker has released the uplink resource.
  • the method further includes:
  • the network side After receiving the uplink contention message sent by the listener for the first time, the network side confirms whether the uplink resource is occupied, and sends a notification message that the uplink resource is busy to the listener when occupied.
  • the listener performs the authorization of the uplink resource, and starts the uplink detection timer, and sends an uplink detection message to the listener authorized by the uplink resource to detect whether the uplink resource has been released.
  • the method further includes:
  • the network side After receiving the uplink competing message sent by the listener, the network side confirms whether another listener has sent the uplink competing message, and sometimes sends a notification message that the uplink resource is busy to the listener, and if not, confirms whether the uplink resource is When the user is occupied, the notification message that the uplink resource is busy is sent to the listener. When the user is not occupied, the user is authorized to perform the uplink resource, and the uplink detection timer is started to be sent to the listener authorized by the uplink resource. The uplink detection message is used to detect whether the uplink resource has been released.
  • the method further includes:
  • the detection of whether the uplink resource has been released by the speaker is stopped.
  • the uplink detection message and the response message of the uplink detection message are carried in a Slow Associated Control Channel (SACCH) for transmission.
  • SACCH Slow Associated Control Channel
  • a protection system for a voice group call uplink comprising a setting unit, a detecting unit, and a broadcasting unit;
  • a setting unit configured to set an uplink detection message for detecting whether the speaker releases the uplink resource, and a response message of the uplink detection message
  • the detecting unit is configured to: periodically send an uplink detection message to the speaker, and detect whether the speaker returns a response message to the uplink detection message, to confirm whether the speaker has released the uplink resource, and trigger when released Broadcast unit
  • a broadcast unit configured to broadcast an uplink resource idle message on all voice group call channels.
  • the setting unit further sets an uplink detection timer and an uplink detection response timer;
  • the detecting unit further, after determining the uplink authorization of the intercom, starting the uplink detection timer, sending an uplink detection message to the speaker after the uplink detection timer expires, and starting the uplink detection response timing After the uplink detection response timer expires, if the speaker does not receive the response message to the uplink detection message, it is further determined whether the timeout period of the uplink detection response timer exceeds the set threshold, and exceeds the set width.
  • system further includes a determining unit, a sending unit, and an authorization unit, where the determining unit is configured to: after determining that the uplink information sent by the listener is received by the network side for the first time, further confirming whether the uplink resource is occupied, The sending unit is triggered when occupied, and the authorization unit is triggered when it is not occupied;
  • a sending unit configured to send, to the listener, a notification message that the uplink resource is busy
  • an authorization unit configured to perform authorization for the uplink resource for the listener, and trigger the detection unit to detect whether the listener of the uplink resource authorization has released the uplink resource.
  • the system further includes a determining unit, a sending unit, and an authorization unit, where the determining unit is configured to determine, after the network side receives the uplink contention message sent by the listener, whether other listeners have sent the uplink contention message. If not, further confirm whether the uplink resource is occupied, trigger the sending unit when occupying, trigger the authorization unit when not occupied; sometimes trigger the sending unit;
  • a sending unit configured to send, to the listener, a notification message that the uplink resource is busy
  • an authorization unit configured to perform authorization for the uplink resource for the listener, and trigger the detection unit to detect whether the listener of the uplink resource authorization has released the uplink resource. Further, the system further includes:
  • a stopping unit configured to stop, when the uplink release message sent by the speaker is received by the speaker, during the startup period of the uplink detection timer or the uplink detection response timer, stopping, by the detecting unit, the listener authorized by the uplink resource Whether uplink resource detection has been released.
  • the speaker in the VGCS can perform uplink resources.
  • the detection of the occupancy situation in the case that the UA frame is lost when the listener is in the uplink, the terminal is faulty during the speaker's speech, and the uplink release message is lost when the speaker releases the uplink, the present invention can also detect and release the speaker in time. Upstream resources.
  • Figure 1 is a flow chart of the upward competition of the listeners in the VGCS
  • Figure 2 is a flow chart of the speaker's uplink release in the VGCS
  • FIG. 3 is a flowchart of processing for receiving an uplink detection response message when the presenter detects the present invention
  • FIG. 4 is a flowchart of processing for not receiving an uplink detection response message when the presenter detects the present invention
  • FIG. 6 is a schematic diagram of a first component structure of a voice group call uplink protection system according to the present invention
  • FIG. 7 is a schematic diagram of a second component structure of a voice group call uplink protection system according to the present invention.
  • the basic idea of the present invention is to set an uplink detection message for detecting whether the speaker releases the uplink resource and a response message of the uplink detection message (referred to as an uplink detection response message in the present invention), and set an uplink detection timer and uplink detection.
  • the response timer can detect the uplink resource occupancy of the speaker in the VGCS, and the UA frame is lost when the listener competes for the uplink, the speaker
  • the present invention can also detect and release the uplink resources occupied by the speaker in time.
  • a base station subsystem (BSS, Base Station System) includes a base station (BTS, Base Transceiver Station) and a base station controller (BSC, Base Station Controller ) Two parts.
  • BSC Base Station Controller
  • the BSC broadcasts an uplink idle (UPLINK FREE) message to the current listener (MS, Mobile Station); when an MS needs to talk, it sends an uplink access (UPLINK ACCESS) message to the BTS, and the BTS receives the uplink connection.
  • UPLINK FREE uplink idle
  • MS Mobile Station
  • UPLINK ACCESS uplink access
  • the VGCS uplink grant message (VGCS UPLINK GRANT) is sent to the MS, and a speaker detection (TALKER DETECTION) message is sent to the BSC.
  • the BSC will broadcast a UPLINK BUSY message on the group call channel.
  • the BSC further sends an uplink request (UPLINK REQUEAST) message to the MSC to request an uplink resource for the MS requesting the uplink resource;
  • the BTS receives the SABM message sent by the MS, and then sends an establishment indication message to the BSC, and sends a UA message to the MS, when the BSC
  • the uplink request confirmation message is sent to the MSC.
  • the BSS will not be sent to the BSS.
  • both the BSS and the MSC believe that there is still a speaker, therefore, the group The state of the calling channel is always in a busy state, and other listeners cannot compete for the uplink, and the network side enters the uplink hang state.
  • FIG. 2 is a flow chart of the speaker's uplink release in the VGCS.
  • the BSC will broadcast an UPLINK BUSY message on the group call channel; under normal circumstances, when speaking
  • the BSS sends a UPLINK RELEASE message.
  • the BSS After receiving the uplink release message, the BSS sends an UPLINK RELEASE IND message to the MSC and broadcasts on the group call channel.
  • Uplink idle (UPLINK FREE) message when the UPLINK RELEASE message sent by the MS to the BSS is lost, both the BSC and the MSC will not know that the speaker has given up the uplink speech. Therefore, the UPLINK BUSY message is still broadcast on the group call channel.
  • the MS sends the uplink release, it has already turned to the listener or has quit the group call. This will also cause the network side state to hang. dead.
  • the present invention is directed to an uplink resource detection scheme proposed by the above-mentioned speaker when the uplink resource is released and the network side cannot detect the release of the uplink resource.
  • the line detection message, and the uplink detection response message that responds to the uplink detection message is as shown in Table 1:
  • the format of the Protocol Discriminator and the Skip Indicator in Table 1 are respectively found in Sections 10.2 and 10.3.1 of the 3GPP's 44018 protocol, and the details are not mentioned here.
  • the difference between the uplink detection message and the uplink detection response message is only that when the message is received by the speaker, if the uplink resource is currently occupied, the uplink detection response message is directly replied, and if the uplink resource is not occupied, Reply to the BSS with an uplink release message. Since the message number in the current 44018 protocol has been basically used, only one reserved number 0x0c is left.
  • the message types of the uplink detection message and the uplink detection response message are all defined as OxOc, because the uplink detection is a downlink message.
  • the uplink detection response is an uplink message. Therefore, the use of the same message number for these two messages does not cause confusion.
  • FIG. 3 is a flowchart of processing for receiving an uplink detection response message when the presenter detects the present invention.
  • the processing manner is the same as that of FIG. 1 and FIG. 2
  • the processing flow shown is basically the same, and the processing details of each network element receiving the corresponding message are not repeated here.
  • the BSC determines that the uplink resource is allocated for the speaker
  • the UPLINK BUSY message will be broadcast on the group call channel, and the uplink detection timer will be started.
  • an uplink detection (UPLINK DETECT) message is sent to the current speaker through the SACCH.
  • an uplink detection response timer is started, if the uplink detection response timer expires. If the UPLINK DETECT ACK message is not received by the speaker, the network side (BSC) will send the UPLINK DETECT message again, and then start the uplink detection response timer again until the uplink detection response timing. The number of times the device has timed out exceeds the set threshold or the UPLINK DETECT ACK message received by the speaker. After receiving the UPLINK DETECT ACK message from the speaker, the BSC confirms that the current speaker is still in the uplink resource occupation state, and then stops the uplink detection response timer and starts the uplink detection timer, that is, continues the intercom The state of the uplink resource is used for detection.
  • FIG. 4 is a flowchart of processing for not receiving an uplink detection response message when the presenter detects the method.
  • the processing flow shown in FIG. 4 is similar to that of FIG. 3, except that the network side is detecting uplink. After the response timer expires more than the set threshold, the uplink detection response message is still not received. Therefore, the BSC will consider that the speaker has released the uplink resource (the speaker terminal is faulty, or the UA sent by the network side is not received. The message, or the speaker has sent an uplink release message but the network side failed to receive it, and the BSC broadcasts a UPLINK FREE message on the group call channel.
  • FIG. 5 is a general flowchart of the uplink resource detection by the present in the present invention.
  • the terminal (MS) initiates an uplink competition if the group call uplink is idle;
  • Step 502 BTS Sending a speaker detection message to the BSC;
  • Step 503 The BSC determines whether the terminal in the other BTS has sent the uplink request message to the MSC, and if yes, sends the uplink busy message to the terminal that is applied for later; if there is no other contention terminal, sends the uplink request to the MSC.
  • the message requests the authorization of the MSC, and simultaneously broadcasts an uplink busy message on the group call channel under the BSC;
  • Step 504 After receiving the uplink request acknowledgement message of the MSC and the setup indication message sent by the BTS, the BSC sends an uplink request confirmation message to the MSC, and sends an uplink status busy message on all the group call channels of the BSC, and starts the uplink detection timing.
  • the BSC After receiving the uplink request acknowledgement message of the MSC and the setup indication message sent by the BTS, the BSC sends an uplink request confirmation message to the MSC, and sends an uplink status busy message on all the group call channels of the BSC, and starts the uplink detection timing.
  • Step 505 After the uplink detection timer expires, the uplink detection message is sent to the speaker on the SACCH, and the uplink detection response timer is started.
  • Step 506 After receiving the uplink detection response message, the uplink detection response timer is stopped, and the uplink detection timer is restarted, and the uplink resource occupancy of the speaker is detected.
  • the uplink detection timer or the uplink detection response timer that has been set is stopped, and an uplink release indication message is sent to the MSC, and is performed under the BSC.
  • the uplink idle message is sent on all the group call channels, and the process ends.
  • Step 507 The uplink detection response timer has not received the uplink detection response message of the speaker. In this case, the uplink detection message is resent, and the uplink detection response timer is restarted. If the uplink detection response timer expires, the uplink detection response timer is not received. If the uplink detection response message is sent to the MSC, the uplink detection message is sent to the MSC, and if the timeout period of the uplink detection response timer exceeds the set threshold, the uplink release indication message is sent to the MSC. The uplink idle message is broadcasted on the group call channel under the BSC, and the process ends.
  • the technical solution of the present invention is also applicable to the situation that the uplink release message is lost when the speaker releases the uplink. Condition. Since the uplink detection message and the uplink detection response message of the present invention are both carried and transmitted on the SACCH, there is no impact on the voice quality of the speaker.
  • the duration of the uplink detection timer and the uplink detection response timer of the present invention and the detection period can be set according to actual needs, so that the operation is convenient.
  • FIG. 6 is a schematic diagram of a first component structure of a voice group call uplink protection system according to the present invention.
  • the voice group call uplink protection system of the present invention includes a setting unit 60, a detecting unit 61, and a broadcasting unit 62.
  • the setting unit 60 is configured to set a response message for detecting whether the speaker releases the uplink detection message of the uplink resource and the uplink detection message;
  • the detecting unit 61 is configured to: by periodically sending an uplink detection message to the speaker, and detecting whether the speaker returns a response message to the uplink detection message, to confirm whether the speaker has released the uplink resource, when released Triggering broadcast unit 62;
  • the broadcast unit 62 is configured to broadcast an uplink resource idle message on all voice group call channels.
  • the setting unit 60 further sets the uplink detection timer and the uplink detection response timing to cry.
  • the detecting unit 61 further determines, after determining the uplink authorization of the intercom, the uplink detection timer, and sends an uplink detection message to the speaker after the uplink detection timer expires, and starts the uplink detection response timing. After the uplink detection response timer expires, if the speaker does not receive the response message to the uplink detection message, it is further determined whether the timeout period of the uplink detection response timer exceeds the set threshold, and exceeds the set width.
  • FIG. 7 is a schematic diagram of a second component structure of a voice group call uplink protection system according to the present invention, such as As shown in FIG. 7, on the basis of the system shown in FIG. 6, the voice group call uplink protection system of the present invention further includes a determining unit 63, a sending unit 64, and an authorization unit 65, where
  • the determining unit 63 is configured to: after determining that the uplink information sent by the listener is received by the network for the first time, further confirm whether the uplink resource is occupied, triggering the sending unit 64 when occupied, and triggering the authorization unit 65 when not occupied;
  • the sending unit 64 is configured to send, to the listener, a notification message that the uplink resource is busy;
  • the authorization unit 65 is configured to perform authorization for the uplink resource for the listener, and trigger the detecting unit 61 to detect whether the listener of the uplink resource authorization has released the uplink resource.
  • the voice group call uplink protection system of the present invention further includes a determining unit (not shown), a transmitting unit (not shown), and an authorization unit (not shown), wherein
  • a determining unit configured to: after receiving the uplink competing message sent by the listener, determine whether the other listener has sent the uplink competing message, and if not, further confirm whether the uplink resource is occupied, and trigger the sending unit when occupying , triggering the authorization unit when not occupied; sometimes triggering the sending unit;
  • a sending unit configured to send, to the listener, a notification message that the uplink resource is busy
  • an authorization unit configured to perform authorization for the uplink resource for the listener, and trigger the detection unit to detect whether the listener of the uplink resource authorization has released the uplink resource.
  • the voice group call uplink protection system of the present invention further includes: a stopping unit (not shown), configured to be in the uplink detection timer or the uplink detection response timer.
  • a stopping unit configured to be in the uplink detection timer or the uplink detection response timer.
  • the uplink detection message and the response message of the uplink detection message are carried in the SACCH for transmission.
  • the voice group call uplink protection system of the present invention is implemented.
  • the implementation functions of the foregoing processing units can be understood by referring to the related description of the foregoing method.
  • the functions of the various processing units in the figures may be implemented by a program running on a processor or by a specific logic circuit.

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Abstract

本发明公开了一种语音组呼上行的保护方法，设置用于检测讲者是否释放上行资源的上行检测消息和所述上行检测消息的响应消息；所述方法还包括：通过周期性地向讲者发送上行检测消息，并检测所述讲者是否返回对上行检测消息的响应消息来确认所述讲者是否已释放所述上行资源；所述讲者已释放所述上行资源时，在所有语音组呼信道上广播上行资源空闲消息。本发明同时公开了一种实现前述方法的语音组呼上行的保护系统。本发明在听者竞争上行时UA帧丢失、讲者讲话过程中终端故障以及讲者释放上行时上行释放消息丢失等情况下，也能及时检测出并释放讲者所占用的上行资源。

Description

语音组呼上行的保护方法及系统 技术领域
本发明涉及一种语音组呼业务中上行检测技术， 尤其涉及一种语音组 呼上行的保护方法及系统。 背景技术
语音组呼业务（VGCS, Voice Group Call Service ) 又简称为组呼， 是 一种电信业务。 组呼业务定义了一种由多方参加， 其中一部分人可以讲话、 多方聆听的点对多点语音通讯方式。 该业务突破了点对点通信的局限性， 能够以简便快捷的方式建立群组呼叫， 实现调度指挥、 紧急通知等功能。
VGCS 如同开会， 同时只能一个人讲话， 其他人作为听者， 当讲话的 用户结束讲话时其他的听者才可以占用上行进行讲话。一次 VGCS业务中 , 当某一用户占用上行后， 网络侧会在组呼信道上广播组呼信道上行忙消息， 只有当占用上行的用户释放上行后， 才会在组呼信道上广播上行空闲消息， 此时听者用户才能申请上行讲话权， 如果网络侧授权该申请用户， 该用户 才能占用上行进行讲话， 此时， 网络侧会再次在各个组呼信道上向其余各 终端发送上行忙的消息。
在不支持讲者优先级的情况下， 只有当前讲话用户放弃上行后听者才 能讲话， 而当讲话用户出现某种故障或者在发送给 VGCS终端的未编号确 认（UA, Unnumbered Acknowledgment ) 消息丟失时， 将无法通知网络侧 释放上行， 由于网络侧不知道讲者出现了某种故障， 就不会释放组呼上行， 此时就出现了组呼上行链路状态吊死现象， 即没有讲者讲话， 而其他的听 者又无法竟争上行。 一旦出现了这种情况， 不但会造成很大的资源浪费， 更重要的是会导致整个调度系统出现故障， 后果比较严重。 因此， 针对现 有网络的不足， 需要一种防护措施， 来避免因终端故障或消息丟失等问题 导致网络侧上行状态出现吊死的现象。
针对上述现有技术的不足， 公开日为 2007年 5 月 23 日、 公开号为 CN1968460A的中国专利申请公开了 "一种释放语音组呼上行的方法"， 该 专利申请提出了利用设定有权限的调度员来释放上行， 但是， 上述技术方 案中， 如果有权限的调度员正在进行高优先级的业务或者当该调度的终端 关机的情况下， 就不能实现对组呼上行链路状态的保护； 公开日为 2006年 12月 27日、公开号为 CN1885970A的中国专利申请公开了一种业务用户占 用组呼上行信道后的保护方法及系统， 该专利申请提出了一种占用上行后 限制上行讲话时长， 具体通过定时器来限制讲话者的讲话时长， 如果定时 器时长设置过短， 在讲者还没有结束讲话就被释放上行， 会给业务进行带 来不便； 如果设置过长， 又将达不到很好的上行链路保护效果， 比如， 当 发送给终端的授权消息丟失， 而网络侧在组呼信道上已经广播了上行忙消 息的情况下， 由于申请上行讲话权的终端没有收到网络侧的消息则认为网 络侧没有授权， 实际上网络侧已经授权给该终端， 并且也已经在所有的组 呼信道上广播了组呼上行忙消息， 因此就出现了终端和网络侧状态不一致 的情况， 当这种情况出现时只能等到定时器超时后才能释放上行， 定时器 设置这段时间没有讲者讲话而且听者也无法竟争到上行。 该技术方案的灵 活性不高，而且，每次在定时器超时后还需要向移动交换中心（MSC, Mobile Switching Center )发消息检测讲者用户的状态是否正常， 这显然增加了处 理复杂度。 发明内容
有鉴于此， 本发明的主要目的在于提供一种语音组呼上行的保护方法 及系统， 能对讲者占用上行资源的状况进行检测， 确定讲者当前故障或网 络侧未接收到讲者的上行资源释放通知时， 也能释放上行资源。 为达到上述目的， 本发明的技术方案是这样实现的：
一种语音组呼上行的保护方法， 设置用于检测讲者是否释放上行资源 的上行检测消息和所述上行检测消息的响应消息 （本发明中称为上行检测 响应消息）； 所述方法还包括：
通过周期性地向讲者发送上行检测消息， 并检测所述讲者是否返回对 上行检测消息的响应消息来确认所述讲者是否已释放所述上行资源；
所述讲者已释放所述上行资源时， 在所有语音组呼信道上广播上行资 源空闲消息。
进一步地， 所述通过周期性地向讲者发送上行检测消息， 并检测所述 讲者是否返回对上行检测消息的响应消息来确认所述讲者是否已释放所述 上行资源， 具体为：
设置上行检测定时器和上行检测响应定时器；
网络侧确定对讲者上行授权后， 启动所述上行检测定时器， 在所述上 行检测定时器超时后向所述讲者发送上行检测消息， 并启动所述上行检测 响应定时器；
所述上行检测响应定时器超时后， 若未接收到所述讲者对上行检测消 息的响应消息， 进一步判断所述上行检测响应定时器超时次数是否超出设 定阔值， 超出设定阔值时则确认所述讲者已释放所述上行资源， 若未超出 设定阔值， 则重新发送所述上行检测消息， 并启动所述上行检测响应定时 器； 若接收到所述讲者对上行检测消息的响应消息， 则重新启动所述上行 检测定时器， 并在所述上行检测定时器超时后， 继续向所述讲者发送上行 检测消息， 检测所述讲者是否已释放所述上行资源。
进一步地， 所述方法还包括：
网络侧首次接收到听者发送的上行竟争消息后， 确认所述上行资源是 否被占用， 占用时向所述听者发送上行资源忙的通知消息， 未占用时， 为 所述听者进行上行资源的授权， 并启动所述上行检测定时器， 向上行资源 授权的听者发送上行检测消息， 进行上行资源是否已释放的检测。
或者， 所述方法还包括：
网络侧接收到听者发送的上行竟争消息后， 确认是否已有其他听者发 送了上行竟争消息， 有时向所述听者发送上行资源忙的通知消息， 没有时 确认所述上行资源是否被占用， 占用时向所述听者发送上行资源忙的通知 消息， 未占用时， 为所述听者进行上行资源的授权， 并启动所述上行检测 定时器， 向上行资源授权的听者发送上行检测消息， 进行上行资源是否已 释放的检测。
进一步地， 所述方法还包括：
在所述上行检测定时器或所述上行检测响应定时器的启动期间内， 接 收到讲者发送的上行释放消息时， 停止对所述讲者是否已释放所述上行资 源的检测。
进一步地， 所述上行检测消息和所述上行检测消息的响应消息承载于 慢速随路控制信道（ SACCH, Slow Associated Control Channel )中进行发送。
一种语音组呼上行的保护系统， 包括设置单元、 检测单元和广播单元； 其中，
设置单元， 用于设置用于检测讲者是否释放上行资源的上行检测消息 和所述上行检测消息的响应消息；
检测单元， 用于通过周期性地向讲者发送上行检测消息， 并检测所述 讲者是否返回对上行检测消息的响应消息， 来确认所述讲者是否已释放所 述上行资源， 释放时触发广播单元；
广播单元， 用于在所有语音组呼信道上广播上行资源空闲消息。
进一步地， 所述设置单元进一步地， 设置上行检测定时器和上行检测 响应定时器； 所述检测单元进一步地， 确定对讲者上行授权后， 启动所述上行检测 定时器， 在所述上行检测定时器超时后向所述讲者发送上行检测消息， 并 启动所述上行检测响应定时器； 所述上行检测响应定时器超时后， 若未接 收到所述讲者对上行检测消息的响应消息， 进一步判断所述上行检测响应 定时器超时次数是否超出设定阔值， 超出设定阔值时则确认所述讲者已释 放所述上行资源， 若未超出设定阔值， 则重新发送所述上行检测消息， 并 启动所述上行检测响应定时器； 若接收到所述讲者对上行检测消息的响应 消息， 则重新启动所述上行检测定时器， 并在所述上行检测定时器超时后， 继续向所述讲者发送上行检测消息， 检测所述讲者是否已释放所述上行资 源。
进一步地， 所述系统还包括确定单元、 发送单元和授权单元， 其中， 确定单元， 用于确定网络侧首次接收到听者发送的上行竟争消息后， 进一步确认所述上行资源是否被占用， 占用时触发发送单元， 未占用时触 发授权单元；
发送单元， 用于向所述听者发送上行资源忙的通知消息；
授权单元， 用于为所述听者进行上行资源的授权， 并触发所述检测单 元检测上行资源授权的听者否已释放上行资源。
或者， 所述系统还包括确定单元、 发送单元和授权单元， 其中， 确定单元， 用于网络侧接收到听者发送的上行竟争消息后， 确定是否 已有其他听者发送了上行竟争消息， 没有时进一步确认所述上行资源是否 被占用， 占用时触发发送单元， 未占用时触发授权单元； 有时触发发送单 元；
发送单元， 用于向所述听者发送上行资源忙的通知消息；
授权单元， 用于为所述听者进行上行资源的授权， 并触发所述检测单 元检测上行资源授权的听者否已释放上行资源。 进一步地， 所述系统还包括：
停止单元， 用于在所述上行检测定时器或所述上行检测响应定时器的 启动期间内， 接收到讲者发送的上行释放消息时， 停止所述检测单元对上 行资源授权的听者进行的否已释放上行资源检测。
本发明中， 通过设置用于检测讲者是否释放上行资源的上行检测消息 和上行检测消息的响应消息， 以及设置上行检测定时器和上行检测响应定 时器， 可以对 VGCS中的讲者进行上行资源占用情况的检测， 在听者竟争 上行时 UA帧丟失、 讲者讲话过程中终端故障以及讲者释放上行时上行释 放消息丟失等情况下， 本发明也能及时检测出并释放讲者所占用的上行资 源。 虽然增设了上行检测消息和上行检测消息的响应消息， 由于均是承载 于 SACCH上进行发送和接收，因此，不会对讲者的语音质量有任何的影响。 附图说明
图 1为 VGCS中听者上行竟争的流程图；
图 2为 VGCS中讲者上行释放的流程图；
图 3为本发明对讲者检测时接收到上行检测响应消息的处理流程图； 图 4为本发明对讲者检测时没有收到上行检测响应消息的处理流程图； 图 5为本发明对讲者进行上行资源检测的总流程图；
图 6为本发明语音组呼上行的保护系统的第一种组成结构示意图； 图 7为本发明语音组呼上行的保护系统的第二种组成结构示意图。 具体实施方式
本发明的基本思想为， 通过设置用于检测讲者是否释放上行资源的上 行检测消息和上行检测消息的响应消息 （本发明中称为上行检测响应消 息）， 以及设置上行检测定时器和上行检测响应定时器， 可以对 VGCS中的 讲者进行上行资源占用情况的检测， 在听者竟争上行时 UA帧丟失、 讲者 讲话过程中终端故障以及讲者释放上行时上行释放消息丟失等情况下， 本 发明也能及时检测出并释放讲者所占用的上行资源。
图 1为 VGCS中听者上行竟争的流程图， 如图 1所示， 本发明中， 基 站子系统（BSS , Base Station System ) 包括基站 （BTS, Base Transceiver Station )和基站控制器（BSC, Base Station Controller ) 两部分。 BSC向当 前的听者（各移动台（ MS, Mobile Station ) )广播上行空闲（ UPLINK FREE ) 消息； 某一 MS需要讲话时， 向 BTS发送上行接入 ( UPLINK ACCESS ) 消息， BTS接收到上行接入消息后，向 MS发送 VGCS 上行授权消息（ VGCS UPLINK GRANT ), 并向 BSC发送讲者检测 （ TALKER DETECTION ) 消 息， 同时， BSC将会在组呼信道上广播上行忙（ UPLINK BUSY )消息。 BSC 进一步向 MSC发送上行请求（ UPLINK REQUEAST )消息， 为请求上行资 源的 MS请求上行资源； BTS收到 MS发来的 SABM消息， 随后向 BSC发 送建立指示消息， 并向 MS发送 UA消息， 当 BSC接收到 BTS发来的建立 指示消息后向 MSC发送上行请求证实消息。但是，如果 BTS向 MS发送的 UA消息，由于某种原因丟失或 MS未能接收到时，就不会发送语音给 BSS, 而此时 BSS内部以及 MSC均认为目前还存在讲者， 因此，组呼信道的状态 一直处于忙的状态， 其他的听者也无法竟争上行， 网络侧进入上行链路吊 死状态。
图 2为 VGCS中讲者上行释放的流程图， 如图 2所示， 由于当前存在 讲者， 因此， BSC将会在组呼信道上广播上行忙（UPLINK BUSY ) 消息； 正常情况下， 当讲者想要放弃讲话权时，会给 BSS发送上行释放 ( UPLINK RELEASE ) 消息， BSS收到该上行释放消息后， 会向 MSC发送上行释放 指示 （ UPLINK RELEASE IND ) 消息， 同时会在组呼信道上广播上行空闲 ( UPLINK FREE ) 消息； 然而， 当 MS发送给 BSS的上行释放 ( UPLINK RELEASE ) 消息丟失时， BSC和 MSC都将不知道讲者已经放弃上行讲话 权， 因此， 组呼信道上仍然广播的是上行忙 （UPLINK BUSY ) 消息， 而 MS发送完上行释放后， 已经转为听者或已经退出本次组呼， 此时也会导致 网络侧状态吊死。
本发明正是针对上述讲者已释放上行资源而网络侧却不能检测到该上 行资源释放时而提出的上行资源检测方案。 行检测消息 , 以及对上行检测消息进行响应的上行检测响应消息； 具体地 , 本发明中的上行检测消息以及上行检测响应消息的结构定义如表 1所示：
表 1
Figure imgf000010_0001
表 1中的协议鉴别器 ( Protocol Discriminator )和跳跃指示 ( Skip Indicator ) 的格式分别见 3GPP的 44018协议的 10.2和 10.3.1节， 这里不再赞述其细 节。 本发明中， 上行检测消息和上行检测响应消息之间的区别仅在于消息 当讲者接收到上行检测消息时， 如果当前占用上行资源， 则直接回复上行 检测响应消息， 若未占用上行资源， 则向 BSS回复上行释放消息。 由于目 前 44018协议中的消息号已经基本使用完毕， 只剩下一个保留号 0x0c, 因 此， 本发明中将上行检测消息以及上行检测响应消息的消息类型都定义为 OxOc, 因为上行检测是下行消息， 而上行检测响应是上行消息， 因此， 这 两条消息釆用同一个消息号也不会导致混淆。
图 3 为本发明对讲者检测时接收到上行检测响应消息的处理流程图， 如图 3所示， 在向讲者发送上行检测消息之前， 其处理方式与图 1及图 2 所示的处理流程基本相同， 这里不再赘述各网元接收到相应消息的处理细 节。 当 BSC 确定为讲者分配了上行资源后， 将在组呼信道上广播上行忙 ( UPLINK BUSY )消息， 同时， 将启动上行检测定时器。 在该上行检测定 时器超时后， 将通过 SACCH 向当前的讲者发送上行检测 （UPLINK DETECT )消息， 此时， 将启动另一定时器——上行检测响应定时器， 如果 上行检测响应定时器超时仍未接收到讲者发送的上行检测响应 （ UPLINK DETECT ACK )消息， 则网络侧（ BSC )将会再次发送上行检测（ UPLINK DETECT )消息， 并再次启动上行检测响应定时器， 直到上行检测响应定时 器超时的次数超过设定的阔值或接收到讲者回复的上行检测响应（ UPLINK DETECT ACK )消息。当接收到讲者回复的上行检测响应（ UPLINK DETECT ACK ) 消息后， BSC确认当前的讲者仍处于上行资源占用状态， 则会停止 上行检测响应定时器并启动上行检测定时器， 即继续对讲者占用上行资源 的状态进行检测。
图 4为本发明对讲者检测时没有收到上行检测响应消息的处理流程图， 如图 4所示， 图 4所示的处理流程与图 3类似， 所不同的是， 网络侧在上 行检测响应定时器超时的次数超过设定的阔值后， 仍然未收到上行检测响 应消息， 这样， BSC将会认为讲者已释放上行资源 （讲者终端故障， 或未 接收到网络侧发送的 UA 消息， 或讲者已发送上行释放消息但网络侧未能 接收到）， BSC在组呼信道上广播上行空闲 （ UPLINK FREE ) 消息。
图 5为本发明对讲者进行上行资源检测的总流程图， 如图 5所示， 本 步骤 501 , 终端 （MS )在组呼上行链路空闲的情况下发起上行竟争； 步骤 502 , BTS给 BSC发送讲者检测消息；
具体的， 由于一个 BSC下可能会有多个 BTS, 因此， 当一个 BTS下的 用户发送了上行请求后， 需要在 BSC进行标记， 以免两个 BTS下的用户同 时竟争。 也就是说， 当发起上行竟争时， BSC 只会接收最先发起上行竟争 请求的 MS的请求， 对于其他的 MS, 将会向其广播上行忙消息。
步骤 503, BSC判断当前有无其他 BTS下的终端已经向 MSC发送了上 行请求的消息， 如果有则给后申请的终端发送上行忙消息； 若当前无其他 竟争终端，则向 MSC发送上行请求消息，请求 MSC的授权，同时在本 BSC 下的组呼信道上广播上行忙消息；
步骤 504, BSC收到 MSC的上行请求确认消息以及 BTS发送的建立指 示消息后， 给 MSC发送上行请求证实消息， 在本 BSC下的所有组呼信道 上发送上行状态忙消息， 同时启动上行检测定时器；
步骤 505, 上行检测定时器超时后， 在 SACCH上给讲者发送上行检测 消息， 并启动上行检测响应定时器；
步骤 506, 上行检测响应定时器超时后， 若收到上行检测响应消息， 则 停止该上行检测响应定时器， 并重新启动上行检测定时器， 重新对讲者的 上行资源占用情况进行检测；
具体的， 若收到了讲者发来的上行释放（uplink release )消息， 则停止 相关已经设定的上行检测定时器或上行检测响应定时器，给 MSC发送上行 释放指示消息， 并在本 BSC下的所有组呼信道上发送上行空闲消息， 流程 结束。
步骤 507, 上行检测响应定时器超时仍未收到讲者的上行检测响应消 息， 此时， 重新发送上行检测消息， 并重新启动上行检测响应定时器， 若 该上行检测响应定时器超时仍未收到上行检测响应消息， 则继续重发上行 检测消息， 如果上行检测响应定时器的超时次数超出了设定阔值， 则认为 讲者已释放上行资源， 则直接向 MSC发送上行释放指示消息， 并在本 BSC 下的组呼信道上广播上行空闲消息， 流程结束。
本发明的技术方案还适用于讲者释放上行时， 上行释放消息丟失的情 况。由于本发明的上行检测消息以及上行检测响应消息均是在 SACCH上承 载并发送的， 因此对于讲者的语音质量不会造成任何影响。
本发明的上行检测定时器以及上行检测响应定时器的时长以及检测周 期均可根据实际需求而设定， 因此操作比较方便。
图 6为本发明语音组呼上行的保护系统的第一种组成结构示意图， 如 图 6所示， 本发明语音组呼上行的保护系统包括设置单元 60、 检测单元 61 和广播单元 62; 其中，
设置单元 60, 用于设置用于检测讲者是否释放上行资源的上行检测消 息和所述上行检测消息的响应消息；
检测单元 61 , 用于通过周期性地向讲者发送上行检测消息， 并检测所 述讲者是否返回对上行检测消息的响应消息， 来确认所述讲者是否已释放 所述上行资源， 释放时触发广播单元 62;
广播单元 62, 用于在所有语音组呼信道上广播上行资源空闲消息。 上述设置单元 60进一步地， 设置上行检测定时器和上行检测响应定时 哭.
口 ？
上述检测单元 61进一步地， 确定对讲者上行授权后， 启动所述上行检 测定时器， 在所述上行检测定时器超时后向所述讲者发送上行检测消息， 并启动所述上行检测响应定时器； 所述上行检测响应定时器超时后， 若未 接收到所述讲者对上行检测消息的响应消息， 进一步判断所述上行检测响 应定时器超时次数是否超出设定阔值， 超出设定阔值时则确认所述讲者已 释放所述上行资源， 若未超出设定阔值， 则重新发送所述上行检测消息， 并启动所述上行检测响应定时器； 若接收到所述讲者对上行检测消息的响 应消息， 则重新启动所述上行检测定时器， 继续向所述讲者发送上行检测 消息， 检测所述讲者是否已释放所述上行资源。
图 7为本发明语音组呼上行的保护系统的第二种组成结构示意图， 如 图 7所示， 在图 6所示系统的基础上， 本发明语音组呼上行的保护系统还 包括确定单元 63、 发送单元 64和授权单元 65 , 其中，
确定单元 63 ,用于确定网络侧首次接收到听者发送的上行竟争消息后， 进一步确认所述上行资源是否被占用， 占用时触发发送单元 64, 未占用时 触发授权单元 65;
发送单元 64, 用于向所述听者发送上行资源忙的通知消息；
授权单元 65 , 用于为所述听者进行上行资源的授权， 并触发上述检测 单元 61检测上行资源授权的听者否已释放上行资源。
或者， 在图 6所示系统的基础上， 本发明语音组呼上行的保护系统还 包括确定单元（未图示）、 发送单元（未图示）和授权单元（未图示）， 其 中，
确定单元， 用于网络侧接收到听者发送的上行竟争消息后， 确定是否 已有其他听者发送了上行竟争消息， 没有时进一步确认所述上行资源是否 被占用， 占用时触发发送单元， 未占用时触发授权单元； 有时触发发送单 元；
发送单元， 用于向所述听者发送上行资源忙的通知消息；
授权单元， 用于为所述听者进行上行资源的授权， 并触发所述检测单 元检测上行资源授权的听者否已释放上行资源。
在图 6或图 7所示系统的基础上， 本发明语音组呼上行的保护系统还 包括： 停止单元（未图示）， 用于在所述上行检测定时器或所述上行检测响 应定时器的启动期间内， 接收到讲者发送的上行释放消息时， 停止所述检 测单元对上行资源授权的听者进行的否已释放上行资源检测。
所述上行检测消息和所述上行检测消息的响应消息承载于 SACCH 中 进行发送。
本领域技术人员应当理解， 本发明语音组呼上行的保护系统是为实现 前述的本发明语音组呼上行的保护方法而设计的， 上述各处理单元的实现 功能可参照前述方法的相关描述而理解。 图中的各处理单元的功能可通过 运行于处理器上的程序而实现， 也可通过具体的逻辑电路而实现。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种语音组呼上行的保护方法， 其特征在于， 设置用于检测讲者是 否释放上行资源的上行检测消息和所述上行检测消息的响应消息； 所述方 法还包括：
通过周期性地向讲者发送上行检测消息， 并检测所述讲者是否返回对 上行检测消息的响应消息来确认所述讲者是否已释放所述上行资源；
所述讲者已释放所述上行资源时， 在所有语音组呼信道上广播上行资 源空闲消息。
2、 根据权利要求 1所述的保护方法， 其特征在于， 所述通过周期性地 向讲者发送上行检测消息， 并检测所述讲者是否返回对上行检测消息的响 应消息来确认所述讲者是否已释放所述上行资源， 具体为：
设置上行检测定时器和上行检测响应定时器；
网络侧确定对讲者上行授权后， 启动所述上行检测定时器， 在所述上 行检测定时器超时后向所述讲者发送上行检测消息， 并启动所述上行检测 响应定时器；
所述上行检测响应定时器超时后， 若未接收到所述讲者对上行检测消 息的响应消息， 进一步判断所述上行检测响应定时器超时次数是否超出设 定阔值， 超出设定阔值时则确认所述讲者已释放所述上行资源， 若未超出 设定阔值， 则重新发送所述上行检测消息， 并启动所述上行检测响应定时 器； 若接收到所述讲者对上行检测消息的响应消息， 则重新启动所述上行 检测定时器， 并在所述上行检测定时器超时后， 继续向所述讲者发送上行 检测消息， 检测所述讲者是否已释放所述上行资源。
3、 根据权利要求 2所述的保护方法， 其特征在于， 所述方法还包括： 网络侧首次接收到听者发送的上行竟争消息后， 确认所述上行资源是 否被占用， 占用时向所述听者发送上行资源忙的通知消息， 未占用时， 为 所述听者进行上行资源的授权， 并启动所述上行检测定时器， 向上行资源 授权的听者发送上行检测消息， 进行上行资源是否已释放的检测。
4、 根据权利要求 2所述的保护方法， 其特征在于， 所述方法还包括： 网络侧接收到听者发送的上行竟争消息后， 确认是否已有其他听者发 送了上行竟争消息， 有时向所述听者发送上行资源忙的通知消息， 没有时 确认所述上行资源是否被占用， 占用时向所述听者发送上行资源忙的通知 消息， 未占用时， 为所述听者进行上行资源的授权， 并启动所述上行检测 定时器， 向上行资源授权的听者发送上行检测消息， 进行上行资源是否已 释放的检测。
5、 根据权利要求 2至 4任一项所述的保护方法， 其特征在于， 所述方 法还包括：
在所述上行检测定时器或所述上行检测响应定时器的启动期间内， 接 收到讲者发送的上行释放消息时， 停止对所述讲者是否已释放所述上行资 源的检测。
6、 根据权利要求 5所述的保护方法， 其特征在于， 所述上行检测消息 和所述上行检测消息的响应消息承载于慢速随路控制信道（SACCH ) 中进 行发送。
7、 一种语音组呼上行的保护系统， 其特征在于， 所述系统包括设置单 元、 检测单元和广播单元； 其中，
设置单元， 用于设置用于检测讲者是否释放上行资源的上行检测消息 和所述上行检测消息的响应消息；
检测单元， 用于通过周期性地向讲者发送上行检测消息， 并检测所述 讲者是否返回对上行检测消息的响应消息， 来确认所述讲者是否已释放所 述上行资源， 释放时触发广播单元；
广播单元， 用于在所有语音组呼信道上广播上行资源空闲消息。
8、 根据权利要求 7所述的保护系统， 其特征在于， 所述设置单元进一 步地， 设置上行检测定时器和上行检测响应定时器；
所述检测单元进一步地， 确定对讲者上行授权后， 启动所述上行检测 定时器， 在所述上行检测定时器超时后向所述讲者发送上行检测消息， 并 启动所述上行检测响应定时器； 所述上行检测响应定时器超时后， 若未接 收到所述讲者对上行检测消息的响应消息， 进一步判断所述上行检测响应 定时器超时次数是否超出设定阔值， 超出设定阔值时则确认所述讲者已释 放所述上行资源， 若未超出设定阔值， 则重新发送所述上行检测消息， 并 启动所述上行检测响应定时器； 若接收到所述讲者对上行检测消息的响应 消息， 则重新启动所述上行检测定时器， 并在所述上行检测定时器超时后， 继续向所述讲者发送上行检测消息， 检测所述讲者是否已释放所述上行资 源。
9、 根据权利要求 8所述的保护系统， 其特征在于， 所述系统还包括确 定单元、 发送单元和授权单元， 其中，
确定单元， 用于确定网络侧首次接收到听者发送的上行竟争消息后， 进一步确认所述上行资源是否被占用， 占用时触发发送单元， 未占用时触 发授权单元；
发送单元， 用于向所述听者发送上行资源忙的通知消息；
授权单元， 用于为所述听者进行上行资源的授权， 并触发所述检测单 元检测上行资源授权的听者否已释放上行资源。
10、 根据权利要求 8所述的保护系统， 其特征在于， 所述系统还包括 确定单元、 发送单元和授权单元， 其中，
确定单元， 用于网络侧接收到听者发送的上行竟争消息后， 确定是否 已有其他听者发送了上行竟争消息， 没有时进一步确认所述上行资源是否 被占用， 占用时触发发送单元， 未占用时触发授权单元； 有时触发发送单 元；
发送单元， 用于向所述听者发送上行资源忙的通知消息；
授权单元， 用于为所述听者进行上行资源的授权， 并触发所述检测单 元检测上行资源授权的听者否已释放上行资源。
11、 根据权利要求 8至 10任一项所述的保护系统， 其特征在于， 所述 系统还包括：
停止单元， 用于在所述上行检测定时器或所述上行检测响应定时器的 启动期间内， 接收到讲者发送的上行释放消息时， 停止所述检测单元对上 行资源授权的听者进行的否已释放上行资源检测。
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