WO2010034163A1 - 一种dmr专网通信终端、通信系统和实现方法 - Google Patents

一种dmr专网通信终端、通信系统和实现方法 Download PDF

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Publication number
WO2010034163A1
WO2010034163A1 PCT/CN2008/072596 CN2008072596W WO2010034163A1 WO 2010034163 A1 WO2010034163 A1 WO 2010034163A1 CN 2008072596 W CN2008072596 W CN 2008072596W WO 2010034163 A1 WO2010034163 A1 WO 2010034163A1
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Prior art keywords
network communication
private network
dmr
gap
dmr private
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PCT/CN2008/072596
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English (en)
French (fr)
Inventor
郑元福
Original Assignee
深圳市好易通科技有限公司
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Application filed by 深圳市好易通科技有限公司 filed Critical 深圳市好易通科技有限公司
Priority to BRPI0822697A priority Critical patent/BRPI0822697B1/pt
Priority to US12/672,670 priority patent/US8284756B2/en
Priority to AU2008362076A priority patent/AU2008362076B2/en
Priority to PCT/CN2008/072596 priority patent/WO2010034163A1/zh
Priority to EP08877035.9A priority patent/EP2217019B1/en
Priority to CN2008800022130A priority patent/CN101828342B/zh
Publication of WO2010034163A1 publication Critical patent/WO2010034163A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H04W56/007—Open loop measurement
    • H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
    • H04W56/0085—Open loop measurement based on arrival time vs. expected arrival time detecting a given structure in the signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Definitions

  • the present invention relates to private network communication technologies, and more particularly to a DMR private network communication terminal, a system, and an implementation method.
  • the European private network communication standard which is a new alternative to analog PMR (Private Mobile Radio), has a large coverage, high transmission rate, high spectral efficiency, good energy saving effect, etc. Advantages, therefore, mobile communication products based on the DMR standard are widely optimistic in the market.
  • FIG. 1 is a schematic diagram showing the structure of a DMR split-multiple frame in the through mode.
  • the so-called pass-through mode means that communication terminals directly communicate with each other without the need for relaying of the repeater.
  • the DMR split-multiple frame includes two identical slots, each of which has a length of 30 ms, and is further divided into two payloads of the same length by a centered synchronous pattern field of 5 ms in length.
  • the length of each payload is 11.25ms bits.
  • Each gap has a guard interval of 1.25 ms at both ends, so the guard interval between the two gaps is 2.5 ms.
  • FIG. 2 is a schematic diagram of an application environment 200 of a private network communication terminal based on the DMR standard. As shown in FIG. 2, there are a plurality of private network communication terminals 202 to 208 in the application environment 200.
  • the private network communication terminal 202 is performing private network communication with the private network communication terminal 204.
  • the private network communication between the private network communication terminal 202 and the private network communication terminal 204 only occupies one gap in the DMR split multiple access frame, the private network communication terminal 206 and the private network communication terminal 20 in the same geographical area. 8 Still can't use another slot for private network communication.
  • the technical problem to be solved by the present invention is that, in the prior art, the gap position occupied by the same private network communication in different engravings is not fixed, so that the idle gap cannot be determined in advance, thereby making it impossible to initiate a new idle slot. Defect of private network communication, providing a DMR private network communication terminal, communication system and implementation method
  • a DMR private network communication terminal which is used for implementing DMR private network communication in the through mode, including:
  • a communication module configured to receive a DMR synchronization pattern, and send and receive DMR private network communication
  • [11] Also includes:
  • Synchronization module used to:
  • the control communication module transmits and receives DMR private network communication in the pre-assigned communication gap.
  • the synchronization module inserts the pre-assigned communication gap in the gap Synchronous pattern.
  • the synchronization module controls the communication module to directly initiate DMR private network communication, And the synchronization module inserts a synchronization pattern corresponding to the pre-assigned communication gap in a gap in which the DMR private network communication is located.
  • the present invention also provides a DMR private network communication system, which at least includes:
  • the first DMR private network communication terminal and the second DMR private network communication terminal have the same pre-assigned communication gaps
  • the first DMR private network communication terminal and the second DMR private network communication terminal both listen to the DMR synchronization pattern to establish synchronization with the DMR synchronization pattern, and determine the gap of the DMR synchronization pattern according to the DMR synchronization pattern, thereby locking the pre-allocated Communication gap
  • the first DMR private network communication terminal and the second DMR private network communication terminal perform DMR private network communication in the pre-assigned communication gap.
  • the pre-assigned communication gaps of the third DMR private network communication terminal and the fourth DMR private network communication terminal are the same, and the pre-assigned communication gap is different from the first DMR private network communication terminal and second
  • the third DMR private network communication terminal and the fourth DMR private network communication terminal both listen to the DMR synchronization pattern to establish synchronization with the DMR synchronization pattern, and determine the gap of the DMR synchronization pattern according to the DMR synchronization pattern, thereby locking the pre-allocated Communication gap
  • the third DMR private network communication terminal and the fourth DMR private network communication terminal perform DMR private network communication in the pre-assigned communication gap.
  • the present invention also provides a method for implementing DMR private network communication, which is used for implementing DMR private network communication in a pass-through mode, including monitoring a DMR synchronization pattern to establish synchronization with the DMR synchronization pattern, and determining its location according to the DMR synchronization pattern.
  • the gap according to which the pre-assigned communication gap is locked, and the DMR private network communication is sent and received in the pre-assigned communication slot.
  • the performing DMR private network communication in the pre-assigned communication gap further includes inserting the pre-allocated communication in the pre-assigned communication gap The synchronization pattern corresponding to the gap.
  • the method further includes: after initiating the DMR private network communication, directly initiating the DMR private network communication without listening to the DMR synchronization pattern.
  • the directly initiating the DMR private network communication further includes inserting, in the gap in which the DMR private network communication is located, the pre-assigned communication gap Synchronize the pattern.
  • the technical solution of the present invention has the following beneficial effects: by setting communication gaps for the private network communication terminal in advance and limiting the terminals having the same communication gap to communicate with each other, it is ensured that the same road private network communication always passes through the same network. The gap is transmitted. In this way, other private network communication terminals can lock the unused idle gaps in advance, and use the idle gaps to initiate new private network communication, so that the spectrum resources specified in the DMR protocol can be fully utilized.
  • the communication gaps for each communication terminal and limiting the terminals with only the same communication gap to communicate with each other it is also ensured that the calls in different gaps are completely independent of each other and do not affect each other, thereby making two different The gap is assigned to users of different groups.
  • Figure 1 is a schematic diagram of the structure of a DMR split-multiple frame in the through mode
  • FIG. 2 is a schematic diagram of an application environment of a private network communication terminal based on the DMR standard
  • FIG. 3 is a flow chart of a method for implementing DMR private network communication according to a preferred embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a DMR private network communication system according to a preferred embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a DMR private network communication terminal according to a preferred embodiment of the present invention.
  • each of the gaps in the DMR split-multiple-access frame is divided into two payloads of the same length by a centered sync pattern field of 5 ms in length, each of which has a length of 11.25 ms.
  • Six synchronization patterns have been defined in the DMR protocol, namely MS (Mobile
  • two of the above six synchronization patterns may be selected, and are newly defined as a synchronization pattern of the gap 1 and a synchronization pattern of the gap 2, that is, as the gap 1 and the gap 2, respectively.
  • synchronization patterns may also be selected, which are redefined as a voice synchronization pattern of the gap 1 , a data synchronization pattern of the gap 1 , a voice synchronization pattern of the gap 2 , and a gap 2
  • the data synchronization pattern that is, the identification of the gap 1 and the gap 2, identifies the type of private network communication (such as voice or data) carried in each slot.
  • the communication gap of each DMR private network communication terminal is preset, that is, the communication gap of each DMR private network communication terminal is not the gap 1 or the gap 2, the same ⁇ Only DMR private network communication terminals with the same working gap can be used to communicate with each other.
  • method 300 is a flow chart of a method 300 for implementing DMR private network communication in accordance with a preferred embodiment of the present invention. As shown in FIG. 3, method 300 begins in step 302.
  • the DMR private network communication terminal listens to the DMR synchronization pattern, determines its associated gap, and establishes synchronization with the DMR synchronization pattern.
  • the pass-through mode if the DMR synchronization pattern is monitored, there is an ongoing private network communication. As described above, it can be determined whether the crevice in which the pattern is located is crevice 1 or crevice 2 based on the received DMR synchronization pattern.
  • the frame structure of the DMR split-multiple frame in the private network mode can be used to establish synchronization with the DMR synchronization pattern.
  • the DMR private network communication terminal can record the moment of monitoring the DMR synchronization pattern, and synchronize with each gap according to the length of each payload in the gap and the interval between two gaps in the DMR frame.
  • the DMR private network communication terminal locks the pre-assigned communication gap.
  • the present invention pre-sets a communication gap for each DMR private network communication terminal. After establishing synchronization with the DMR synchronization pattern and determining the gap in which the received DMR synchronization pattern is located, the DMR private network communication terminal can be locked to its pre-set communication gap. For example, if the received DMR synchronization pattern is determined to be the gap 1 The DMR private network communication terminal whose communication gap is the gap 1 can lock the gap, and the DMR private network communication terminal whose communication gap is the gap 2 can lock the next gap of the gap, that is, the gap. 2.
  • the DMR private network communication terminal performs the DMR private network communication using the locked communication gap, and the DMR synchronization pattern corresponding to the communication gap is inserted in the gap.
  • the communication gap of the DMR private network communication terminal itself may be the gap occupied by the ongoing private network communication, or may be another gap that is not occupied. If the communication gap of the DMR private network communication terminal is an occupied gap, the DMR private network communication terminal needs to wait until the gap is idle before the private network communication can be performed in the gap.
  • the DM R private network communication terminal can immediately start private network communication.
  • the DMR private network communication terminal can determine whether its communication gap is idle by performing, for example, but not limited to, RSSI detection on its communication gap.
  • method 300 ends at step 310.
  • the private network communication mentioned in this paper can either initiate private network communication or respond to received private network communication. After the private network communication is initiated, if the DMR synchronization pattern is not detected in step 304, it indicates that there is no ongoing private network communication. Therefore, the DMR private network communication terminal can directly initiate the DMR private network communication, and insert the DMR synchronization pattern corresponding to the communication gap in the gap carrying the DMR private network communication.
  • the present invention also provides a DMR private network communication system, which will be described in detail below in conjunction with FIG.
  • the DMR private network communication system 400 includes a plurality of DMR private network communication terminals, for example, terminals 402 to 408, wherein the communication gaps of the terminals 402 and 408 are gaps 1, and the communication gaps of the terminals 404 and 406 Both are gaps 2. Therefore, DMR private network communication can be performed between terminals 402 and 408, and DMR private network communication can be performed between terminals 404 and 406, but terminals 402 and 408 cannot communicate with terminals 404 and 406.
  • Each of the terminals 402 to 408 is configured to monitor the DMR synchronization pattern, determine the gap to which the monitored DMR synchronization pattern belongs, and establish synchronization with the DMR synchronization pattern. Thereafter, the terminal is locked to its pre-set communication gap, and the communication gap is used for DMR private network communication.
  • both terminals 404 and 406 can listen to the DMR synchronization pattern in the DMR split multiple access frame carrying the private network communication between the bearer terminals 402 and 408, whereby both terminals 404 and 406 can establish synchronization with the DMR synchronization pattern.
  • both the terminals 404 and 406 can determine that the gap occupied by the ongoing private network communication between 402 and 408 through the DMR synchronization pattern is the gap 1.
  • Terminals 406 and 408 then lock their communication gaps, i.e., gaps 2, and perform, for example, but not limited to, RSSI detection on the gaps to determine if the gaps are free, and if so, use gaps 2 for DMR private network communications.
  • the present invention also provides a DMR private network communication terminal, which will be described in detail below with reference to FIG.
  • FIG. 5 is a schematic structural diagram of a DMR private network communication terminal 500 according to a preferred embodiment of the present invention. As shown in FIG. 5, the DMR private network communication terminal 500 includes a communication module 502 and a synchronization module 504.
  • the communication module 502 is configured to receive the DMR synchronization pattern and to send and receive DMR private network communication, including receiving the DM R private network communication, initiating or responding to the DMR private network communication.
  • the contents of receiving the DMR synchronization pattern and transceiving the DMR private network communication have been clearly described in the prior art, and therefore will not be described in this article.
  • the synchronization module 504 is configured to analyze and synchronize with the DMR synchronization pattern received by the communication module 502, and determine the gap of the DMR synchronization pattern according to the DMR synchronization pattern, thereby locking the pre-assigned communication gap and controlling The communication module 502 performs DMR private network communication within the communication gap.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Time-Division Multiplex Systems (AREA)

Description

一种 DMR专网通信终端、 通信系统和实现方法 技术领域
[1] 本发明涉及专网通信技术， 更具体地说， 涉及一种 DMR专网通信终端、 通 ί] 系统和实现方法。
背景技术
[2] DMR (Digital Mobile Radio, 数字移动无线电) 标准是 ETSI (European
Telecommunications Standards
Institute, 欧洲电信标准协会） 新近颁布的用于替代模拟 PMR (Private Mobile Radio, 私人移动无线电） 的欧洲专网通信标准， 其具有覆盖范围大、 传输速率 高、 频谱效率高、 节能效果好等诸多优点， 因此基于 DMR标准的移动通信产品 被市场广为看好。
[3] DMR标准釆用双吋隙的吋分多址帧结构。 图 1是直通模式下 DMR吋分多址帧的 结构示意图。 所谓直通模式， 即通信终端之间无需借助中转台的中转而彼此直 接通信。 如图 1所示， DMR吋分多址帧包括两个完全相同的吋隙， 每个吋隙的长 度是 30ms， 并进一步由居中的长度为 5ms的同步图样字段划分为两个长度相同的 载荷， 每一载荷的长度为 11.25ms比特。 每个吋隙在首尾两端各设有一个长度为 1 .25ms的保护间隔， 因此两个吋隙之间的保护间隔为 2.5ms。
[4] 然而， 由于 DMR标准并未进一步定义如何在直通模式下使用帧中的两个吋隙 来同吋支持两路独立的专网通信， 因此现有的基于 DMR标准的专网通信终端仍 然只能使用帧中的一个吋隙进行专网通信。 图 2是现有基于 DMR标准的专网通信 终端的应用环境 200的示意图。 如图 2所示， 在应用环境 200中存在多台专网通信 终端 202〜208。 其中， 专网通信终端 202正在与专网通信终端 204进行专网通信 。 尽管专网通信终端 202与专网通信终端 204之间的语专网通信仅占用 DMR吋分 多址帧中的一个吋隙， 但同一地理区域内的专网通信终端 206和专网通信终端 20 8仍然无法使用另一个吋隙进行专网通信。
[5] 产生上述问题的原因在于， 尽管专网通信终端 202和专网通信终端 204之间的专 网通信仅占用一个吋隙， 但由于被占用的吋隙位置并不固定 （即， 同一路专网 通信在不同吋刻所占用的吋隙可能不同， 例如使用吋隙 1发起专网通信， 在不同 的应答阶段使用吋隙 2或吋隙 1进行应答） ， 使得位于同一地理区域内的其它专 网通信终端无法提前确定未被占用的吋隙是哪个吋隙， 这样一来也就无法发起 新的专网通信。
[6] 因此， 需要一种技术方案， 能够克服现有技术存在的缺陷。
发明内容
[7] 本发明要解决的技术问题在于， 针对现有技术中同一路专网通信在不同吋刻所 占用的吋隙位置不固定使得无法提前确定空闲吋隙从而导致无法使用空闲吋隙 发起新的专网通信的缺陷， 提供一种 DMR专网通信终端、 通信系统和实现方法
[8] 本发明解决其技术问题所釆用的技术方案是：
[9] 一种 DMR专网通信终端， 用于在直通模式下实现 DMR专网通信， 包括：
[10] 通信模块， 用于接收 DMR同步图样， 并收发 DMR专网通信；
[11] 还包括：
[12] 同步模块， 用于：
[13] 依据收到的 DMR同步图样建立同步， 并依据该 DMR同步图样确定其所在的吋 隙， 据此锁定预先分配的通信吋隙；
[14] 控制通信模块在该预先分配的通信吋隙收发 DMR专网通信。
[15] 在本发明提供的 DMR专网通信终端中， 所述同步模块中记录有每一 DMR同步 图样与吋隙标识的对应关系。
[16] 在本发明提供的 DMR专网通信终端中， 当在该预先分配的通信吋隙收发 DMR 专网通信吋， 所述同步模块在该吋隙内插入所述预先分配的通信吋隙对应的同 步图样。
[17] 在本发明提供的 DMR专网通信终端中， 在发起 DMR专网通信吋， 若未收到所 述 DMR同步图样， 则所述同步模块控制所述通信模块直接发起 DMR专网通信， 且所述同步模块在该 DMR专网通信所在的吋隙内插入所述预先分配的通信吋隙 所对应的同步图样。 [18] 本发明还提供了一种 DMR专网通信系统， 至少包括：
[19] 第一 DMR专网通信终端；
[20] 第二 DMR专网通信终端；
[21] 所述第一 DMR专网通信终端和第二 DMR专网通信终端各自的预先分配的通信 吋隙相同；
[22] 所述第一 DMR专网通信终端和第二 DMR专网通信终端均监听 DMR同步图样以 与其建立同步， 并依据该 DMR同步图样确定其所在的吋隙， 据此锁定其预先分 配的通信吋隙；
[23] 所述第一 DMR专网通信终端与第二 DMR专网通信终端在该预先分配的通信吋 隙内进行 DMR专网通信。
[24] 在本发明提供的 DMR专网通信系统中， 至少包括：
[25] 第三 DMR专网通信终端；
[26] 第四 DMR专网通信终端；
[27] 所述第三 DMR专网通信终端和第四 DMR专网通信终端各自的预先分配的通信 吋隙相同， 且该预先分配的通信吋隙不同于所述第一 DMR专网通信终端和第二
DMR专网通信终端的预先分配的通信吋隙；
[28] 所述第三 DMR专网通信终端和第四 DMR专网通信终端均监听 DMR同步图样以 与其建立同步， 并依据该 DMR同步图样确定其所在的吋隙， 据此锁定其预先分 配的通信吋隙；
[29] 所述第三 DMR专网通信终端与第四 DMR专网通信终端在该预先分配的通信吋 隙内进行 DMR专网通信。
[30] 本发明还提供了一种 DMR专网通信的实现方法， 用于在直通模式下实现 DMR 专网通信， 包括监听 DMR同步图样以与其建立同步， 并依据该 DMR同步图样确 定其所在的吋隙， 据此锁定预先分配的通信吋隙， 并在该预先分配的通信吋隙 收发 DMR专网通信。
[31] 在本发明提供的 DMR专网通信的实现方法中， 所述在该预先分配的通信吋隙 进行 DMR专网通信进一步包括， 在该预先分配的通信吋隙内插入该预先分配的 通信吋隙对应的同步图样。 [32] 在本发明提供的 DMR专网通信的实现方法中， 所述方法还包括在发起 DMR专 网通信吋， 在未监听到所述 DMR同步图样吋直接发起 DMR专网通信。
[33] 在本发明提供的 DMR专网通信的实现方法中， 所述直接发起 DMR专网通信进 一步包括在该 DMR专网通信所在的吋隙内插入所述预先分配的通信吋隙所对应 的同步图样。
[34] 实施本发明的技术方案， 具有以下有益效果， 通过为专网通信终端预先设置通 信吋隙并限定只有通信吋隙相同的终端才能相互通信， 可确保同一路专网通信 始终通过同一吋隙进行传送。 这样一来， 其他专网通信终端便可提前锁定未被 占用的空闲吋隙， 并使用该空闲吋隙发起新的专网通信， 从而使 DMR协议中规 定的频谱资源得到充分的利用。 同吋， 通过为每台通信终端预先设置通信吋隙 并限定只有通信吋隙相同的终端才能相互通信， 还可保证不同吋隙内的呼叫彼 此完全独立， 不会相互影响， 从而将两个不同的吋隙分配给不同群组的用户使 用。
附图说明
[35] 图 1是直通模式下 DMR吋分多址帧的结构示意图；
[36] 图 2是现有基于 DMR标准的专网通信终端的应用环境的示意图；
[37] 图 3是依据本发明一较佳实施例的 DMR专网通信实现方法的流程图；
[38] 图 4是依据本发明一较佳实施例的 DMR专网通信系统的结构示意图；
[39] 图 5是依据本发明一较佳实施例的 DMR专网通信终端的结构示意图。
具体实施方式
[40] 为了使本发明的目的、 技术方案及优点更加清楚明白， 以下结合附图及实施例
， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体实施例仅仅用 以解释本发明， 并不用于限定本发明。
[41] 如上文所述， DMR吋分多址帧中的每一吋隙由居中的长度为 5ms的同步图样字 段划分为两个长度相同的载荷， 每一载荷的长度为 11.25ms。 在 DMR协议中共定 义了六种同步图样， 分别是 MS (Mobile
Station, 移动台） 发出的语音同步图样、 MS发出的数据同步图样、 BS (Base Station, 基站） 发出的语音同步图样和 BS发出的数据同步图样、 RC (Reverse Channel, 反转信道） 同步图样、 保留同步图样。 在本申请提供的技术方案中， 可在上述六种同步图样中任选两种， 重新定义为吋隙 1的同步图样和吋隙 2的同 步图样， 即分别用作吋隙 1和吋隙 2的标识。 作为可选的， 还可在上述六种同步 图样中任选四种， 重新定义为吋隙 1的语音同步图样、 吋隙 1的数据同步图样、 吋隙 2的语音同步图样和吋隙 2的数据同步图样， 即在标识吋隙 1和吋隙 2的同吋 ， 标识每一吋隙内承载的专网通信的类型 （如语音或者数据） 。
[42] 应注意， 在具体实现过程中， 若上述六种同步图样中部分图样的原有功能 （即 其在 DMR协议中定义的功能） 需要保留， 则可在这六种图样中的其他同步图样 进行上述重新定义。 此外， 除了在 DMR协议中定义的六种同步图样中进行选择 夕卜， 还可重新定义新的同步图样。
[43] 在本发明提供的技术方案中， 每一 DMR专网通信终端的通信吋隙被预先设定 ， 即每一 DMR专网通信终端的通信吋隙不是吋隙 1就是吋隙 2， 同吋限定只有工 作吋隙相同的 DMR专网通信终端才能彼此通信。
[44] 下面就结合图 3描述本发明提供的 DMR专网通信的实现方法。
[45] 图 3是依据本发明一较佳实施例的 DMR专网通信实现方法 300的流程图。 如图 3 所示， 方法 300开始于步骤 302。
[46] 随后， 在下一步骤 304， DMR专网通信终端监听 DMR同步图样， 确定其所属吋 隙， 并与该 DMR同步图样建立同步。 在直通模式下， 若监听到 DMR同步图样， 则说明存在正在进行的专网通信。 如上文所述， 可依据收到的 DMR同步图样确 定该图样所在的吋隙是吋隙 1还是吋隙 2。 同吋， 由于 DMR同步图样位于每一吋 隙的中间位置， 因此可依据专网模式下 DMR吋分多址帧的帧结构， 来与该 DMR 同步图样建立同步。 例如， DMR专网通信终端可记录监听到 DMR同步图样的吋 刻， 依据吋隙中每一载荷的长度和 DMR帧中两个吋隙之间的间隔， 来与每一吋 隙同步。
[47] 随后， 在下一步骤 306， DMR专网通信终端锁定预先分配的通信吋隙。 本发明 为每一 DMR专网通信终端预先设置通信吋隙。 在与 DMR同步图样建立同步且确 定收到的 DMR同步图样所在的吋隙之后， DMR专网通信终端便可锁定为其预先 设置的通信吋隙。 例如， 若依据收到的 DMR同步图样确定其所在的吋隙为吋隙 1 ， 则通信吋隙为吋隙 1的 DMR专网通信终端便可锁定该吋隙， 而通信吋隙为吋隙 2的 DMR专网通信终端便可锁定该吋隙的下一吋隙即吋隙 2。
[48] 随后， 在下一步骤 308， DMR专网通信终端使用锁定的通信吋隙进行 DMR专网 通信， 同吋在该吋隙内插入与其通信吋隙相对应的 DMR同步图样。 该如上文所 述， 在直通模式下， 若在步骤 304中监听到 DMR同步图样， 则说明存在正在进行 的专网通信。 因此， DMR专网通信终端自身的通信吋隙可能是正在进行的专网 通信所占用的吋隙， 也可能是未被占用的另一吋隙。 若 DMR专网通信终端的通 信吋隙为已占用的吋隙， 则 DMR专网通信终端需要等到该吋隙空闲吋才可在该 吋隙进行专网通信。 若 DMR专网通信终端的通信吋隙为未被占用的吋隙， 则 DM R专网通信终端可以立即开始进行专网通信。 在具体实现过程中， DMR专网通信 终端可以通过对其通信吋隙进行例如但不限于 RSSI检测来判定其通信吋隙是否 空闲。
[49] 最后， 方法 300结束于步骤 310。
[50] 本文提到的进行专网通信， 既可以是发起专网通信， 也可以是对收到的专网通 信作出应答。 在发起专网通信吋， 若在步骤 304中未能监听到 DMR同步图样， 则 说明不存在正在进行的专网通信。 此吋， DMR专网通信终端可直接发起 DMR专 网通信， 并在承载其 DMR专网通信的吋隙内插入其通信吋隙所对应的 DMR同步 图样。
[51] 本发明还提供了一种 DMR专网通信系统， 下面就结合图 4对其进行详细描述。
[52] 图 4是依据本发明一较佳实施例的 DMR专网通信系统 400的结构示意图。 如图 4 所示， DMR专网通信系统 400包括多台 DMR专网通信终端， 例如终端 402〜408 ， 其中， 终端 402和 408通信吋隙均为吋隙 1， 终端 404和 406的通信吋隙均为吋隙 2。 因此， 终端 402和 408之间可以进行 DMR专网通信， 终端 404和 406之间可以进 行 DMR专网通信， 但终端 402和 408无法与终端 404和 406进行通信。
[53] 每一终端 402〜408用于监听 DMR同步图样， 并确定监听到的 DMR同步图样所 属的吋隙， 并与该 DMR同步图样建立同步。 此后， 该终端锁定为其预先设置的 通信吋隙， 并使用该通信吋隙进行 DMR专网通信。
[54] 如图 4所示， 当终端 402与 408正在使用其通信吋隙即吋隙 1进行 DMR专网通信 吋， 终端 404和 406均可监听到承载终端 402与 408之间承载专网通信的 DMR吋分 多址帧中的 DMR同步图样， 由此终端 404和 406均可与该 DMR同步图样建立同步 。 此外， 终端 404和 406均可通过该 DMR同步图样确定 402与 408之间正在进行的 专网通信所占用的吋隙是吋隙 1。 随后， 终端 406和 408锁定其通信吋隙即吋隙 2 ， 并对该吋隙进行例如但不限于 RSSI检测， 以确定该吋隙是否空闲， 若是， 则 使用吋隙 2进行 DMR专网通信。
[55] 本发明还提供了一种 DMR专网通信终端， 下面就结合图 5对其进行详细描述。
[56] 图 5是依据本发明一较佳实施例的 DMR专网通信终端 500的结构示意图。 如图 5 所示， DMR专网通信终端 500包括通信模块 502和同步模块 504。
[57] 通信模块 502用于接收 DMR同步图样， 以及收发 DMR专网通信， 包括接收 DM R专网通信、 发起或应答 DMR专网通信。 有关接收 DMR同步图样和收发 DMR专 网通信的内容已经在现有技术中做了清楚的描述， 因此本文不再赞述。
[58] 同步模块 504用于分析通信模块 502收到的 DMR同步图样， 并与其建立同步， 同吋依据该 DMR同步图样确定其所在的吋隙， 据此锁定预先分配的通信吋隙， 并控制通信模块 502在该通信吋隙内进行 DMR专网通信。
[59] 以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发明的 精神和原则之内所作的任何修改、 等同替换和改进等， 均应包含在本发明的保 护范围之内。

Claims

权利要求书
1、 一种 DMR专网通信终端， 用于在直通模式下实现 DMR专网通信， 包括 通信模块， 用于接收 DMR同步图样， 并收发 DMR专网通信；
其特征在于， 还包括：
同步模块， 用于：
依据收到的 DMR同步图样建立同步， 以区分各个吋隙；
确定收到的 DMR专网通信所在的吋隙；
控制通信模块在该吋隙内应答该 DMR专网通信。
2、 根据权利要求 1所述的 DMR专网通信终端， 其特征在于，
所述同步模块用于：
锁定空闲吋隙；
控制通信模块在该空闲吋隙内发起 DMR专网通信。
3、 根据权利要求 2所述的 DMR专网通信终端， 其特征在于， 所述同步模块 釆用载波侦听方式或 RSSI检测方式来锁定空闲吋隙。
4、 根据权利要求 2所述的 DMR专网通信终端， 其特征在于，
所述同步模块用于：
在未收到 DMR同步图样吋， 控制通信模块直接发起 DMR专网通信。
5、 一种 DMR专网通信系统， 其特征在于， 至少包括：
第一 DMR专网通信终端；
第二 DMR专网通信终端；
第一 DMR专网通信终端和第二 DMR专网通信终端均监听 DMR同步图样以 建立同步， 据此区分各个吋隙；
第一 DMR专网通信终端锁定空闲吋隙， 并在该空闲吋隙内向第二 DMR专网 通信终端发起 DMR专网通信；
第二 DMR专网通信终端接收该 DMR专网通信， 确定其所在的吋隙， 并在该 吋隙内对该 DMR专网通信作出应答。
6、 根据权利要求 5所述的 DMR专网通信系统， 其特征在于， 若所述 DMR专 网通信终端未监听到 DMR同步图样， 则直接向第二 DMR专网通信终端发起 DMR专网通信。
7、 一种 DMR专网通信的实现方法， 用于在直通模式下实现 DMR专网通信 ， 其特征在于， 包括：
监听 DMR同步图样以与其建立同步， 据此区分各个吋隙的步骤； 以及 在收到 DMR专网通信吋， 确定该 DMR专网通信所在的吋隙， 并在该吋隙内 应答该 DMR专网通信的步骤。
8、 根据权利要求 7所述的 DMR专网通信的实现方法， 其特征在于， 所述方 法还包括，
锁定空闲吋隙， 在发起 DMR专网通信吋， 在该空闲吋隙内发起 DMR专网通 信的步骤。
9、 根据权利要求 8所述的 DMR专网通信的实现方法， 其特征在于， 所述锁 定空闲吋隙进一步包括釆用载波侦听方式或 RSSI检测方式来锁定空闲吋隙
10、 根据权利要求 9所述的 DMR专网通信的实现方法， 其特征在于， 所述 方法还包括：
在未监听到 DMR同步图样吋， 在发起 DMR专网通信吋， 直接发起 DMR专 网通信的步骤。
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