CN101692621B - Method for reducing time delay in links of media interface and base station - Google Patents
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Abstract
本发明公开了一种减小媒体面链路时延的方法，该方法包括：将业务信道的帧偏置提前设定的帧偏置个数个帧偏置后得到的帧偏置，作为该业务信道对应的发送偏置；业务信道从射频信号中解调出业务帧后，在轮询到所述发送偏置时，基站发送解调出的业务帧。本发明同时还公开了一种减小媒体面链路时延的基站，包括设置模块、计时模块、计算模块和发送模块。采用本发明所述的方法和基站，能够降低减小媒体面链路时延的操作的复杂度。
The present invention discloses a method for reducing the time delay of a media plane link. The method comprises: the frame offset obtained after the number of frame offsets set in advance of the frame offset of the traffic channel is used as the frame offset The sending offset corresponding to the traffic channel; after the traffic channel demodulates the service frame from the radio frequency signal, when the sending offset is polled, the base station sends the demodulated service frame. At the same time, the invention also discloses a base station for reducing the time delay of media plane links, which includes a setting module, a timing module, a calculating module and a sending module. By adopting the method and the base station of the present invention, the operation complexity of reducing the link time delay of the media plane can be reduced.
Description
技术领域 technical field
本发明涉及无线通信中业务信道时延技术，尤其涉及一种减小媒体面链路时延的方法及基站。The invention relates to a service channel time delay technology in wireless communication, in particular to a method and a base station for reducing the time delay of a media plane link.
背景技术 Background technique
码分多址(CDMA，Code Division Multiple Access)系统媒体面链路时延较大，导致通话过程中常存在抢话的现象，具体表现为：A正在说话，但由于媒体面延时大，A说的话在较长时间间隔后B才能听到，而在此时间间隔内，B会认为A已经说完，B就开始讲话，如此会影响用户通话质量。可见，要消除上述抢话现象，就必须减小媒体面链路时延。所述媒体面链路包括：移动台到基站的空中业务帧传输链路和基站内部业务帧传输链路；其中，所述空中业务帧传输链路又称为业务信道，驻留在基站的信道板上。In the code division multiple access (CDMA, Code Division Multiple Access) system, the delay of the media plane link is relatively large, which often leads to the phenomenon of grabbing the call during the call. B can hear the words after a long time interval, and within this time interval, B will think that A has finished speaking, and B will start to speak, which will affect the user's call quality. It can be seen that to eliminate the above-mentioned call snatching phenomenon, it is necessary to reduce the link delay of the media plane. The media plane link includes: the air service frame transmission link from the mobile station to the base station and the internal service frame transmission link of the base station; wherein, the air service frame transmission link is also called a service channel, and resides in the channel of the base station board.
以下通过业务帧在媒体面链路的传输流程，具体说明媒体面链路时延是如何产生的。业务帧在媒体面链路的传输流程为：可供基站分配的帧偏置的数目为N，基站顺序轮询N个帧偏置；移动台发起呼叫时，基站为该移动台建立业务信道，并为建立的业务信道分配一个帧偏置，该业务信道包括：移动台发出射频信号，基站接收所述射频信号，并发至所述业务信道；在轮询到该业务信道的帧偏置时，该业务信道从所述射频信号中解调出业务帧，并在再次轮询到该业务信道的帧偏置时，该业务信道将解调出的业务帧发送至基站内部的编解码器；编解码器编码业务帧后向上层网络发出。The following describes in detail how the media plane link delay is generated through the transmission process of the service frame on the media plane link. The transmission process of the service frame on the media plane link is as follows: the number of frame offsets that can be allocated by the base station is N, and the base station polls N frame offsets in sequence; when the mobile station initiates a call, the base station establishes a traffic channel for the mobile station, And allocate a frame offset for the established traffic channel, the traffic channel includes: the mobile station sends a radio frequency signal, the base station receives the radio frequency signal, and sends it to the traffic channel; when the frame offset of the traffic channel is polled, The traffic channel demodulates the traffic frame from the radio frequency signal, and when the frame offset of the traffic channel is polled again, the traffic channel sends the demodulated traffic frame to the codec inside the base station; The decoder encodes the service frame and sends it to the upper layer network.
由此流程可见，信道板解调出业务帧与发出业务帧之间间隔N个帧偏置，而编码业务帧也需要耗费时间，这样，就会产生业务信道时延。目前，减小媒体面链路时延的方法，大多是通过缩短编码所用的时间来减小媒体面链路时延，但缩短编码所用的时间的实现比较复杂。It can be seen from the process that there are N frame offsets between the channel board demodulating the service frame and sending the service frame, and encoding the service frame also takes time, so that the service channel delay will be generated. At present, most of the methods for reducing the link delay of the media plane are to reduce the link delay of the media plane by shortening the time used for encoding, but the realization of shortening the time used for encoding is relatively complicated.
发明内容 Contents of the invention
有鉴于此，本发明的主要目的在于提供一种减小媒体面链路时延的方法及基站，能够降低减小媒体面链路时延的操作的复杂度。In view of this, the main purpose of the present invention is to provide a method and base station for reducing the time delay of media plane links, which can reduce the complexity of operations for reducing the time delay of media plane links.
为达到上述目的，本发明的技术方案是这样实现的：In order to achieve the above object, technical solution of the present invention is achieved in that way:
一种减小媒体面链路时延的方法，顺序轮询各帧偏置，该方法还包括：A method for reducing the link delay of the media plane, sequentially polling each frame offset, the method also includes:
将业务信道的帧偏置提前设定的帧偏置个数个帧偏置后得到的帧偏置，作为该业务信道对应的发送偏置；The frame offset obtained after the number of frame offsets set in advance by the frame offset of the traffic channel is used as the corresponding transmission offset of the traffic channel;
业务信道从射频信号中解调出业务帧后，在轮询到所述发送偏置时，基站发送解调出的业务帧。After the service channel demodulates the service frame from the radio frequency signal, the base station sends the demodulated service frame when the sending offset is polled.
进一步地，在得到业务信道对应的发送偏置前，该方法进一步包括：移动台发起业务呼叫时，基站为该移动台建立业务信道，并分配业务信道的帧偏置。Further, before obtaining the transmission offset corresponding to the traffic channel, the method further includes: when the mobile station initiates a traffic call, the base station establishes a traffic channel for the mobile station, and allocates a frame offset of the traffic channel.
进一步地，在得到业务信道对应的发送偏置后，该方法进一步包括：Further, after obtaining the transmission offset corresponding to the traffic channel, the method further includes:
移动台发出射频信号，基站接收所述射频信号，并发至所述业务信道；The mobile station sends out a radio frequency signal, and the base station receives the radio frequency signal and sends it to the traffic channel;
接收到所述射频信号后，业务信道在轮询到自身的帧偏置时，从接收到的射频信号中解调出业务帧。After receiving the radio frequency signal, the service channel demodulates the service frame from the received radio frequency signal when polling its own frame offset.
进一步地，将业务信道的帧偏置提前设定的帧偏置个数个帧偏置后得到的帧偏置，作为该业务信道对应的发送偏置的过程包括：Further, the frame offset obtained after the frame offset of the traffic channel is set in advance by a number of frame offsets, and used as the transmission offset corresponding to the traffic channel includes:
计算业务信道的帧偏置减去要提前的帧偏置个数的差；将得到的差与可供基站分配的帧偏置的数目求和；使用算得的和除以可供基站分配的帧偏置的数目，得到的余数作为该业务信道对应的发送偏置。Calculate the frame offset of the traffic channel minus the number of frame offsets to advance; sum the difference with the number of frame offsets available for base station allocation; divide the calculated sum by the number of frames available for base station allocation The number of offsets, and the obtained remainder is used as the transmission offset corresponding to the traffic channel.
本发明还提供一种减小媒体面链路时延的基站，该基站包括：设置单元、计时单元、计算单元和发送单元；其中，The present invention also provides a base station for reducing the time delay of media plane links, the base station includes: a setting unit, a timing unit, a calculation unit and a sending unit; wherein,
设置单元，用于设定要提前的帧偏置个数；The setting unit is used to set the number of frame offsets to be advanced;
计时单元，用于顺序轮询各帧偏置；A timing unit for sequentially polling the frame offsets;
计算单元，用于将业务信道的帧偏置提前设定的帧偏置个数个帧偏置后得到的帧偏置，作为该业务信道对应的发送偏置；The calculation unit is used to use the frame offset of the traffic channel as the transmission offset corresponding to the traffic channel to obtain the frame offset by the number of frame offsets set in advance;
信道单元，用于解调出所述业务信道的射频信号中的业务帧后，监测到计时单元轮询到所述发送偏置时，发送解调出的业务帧。The channel unit is configured to send the demodulated service frame when detecting that the timing unit has polled the sending offset after demodulating the service frame in the radio frequency signal of the service channel.
进一步地，该基站进一步包括：Further, the base station further includes:
控制单元，用于在移动台发起业务呼叫时，为该移动台建立业务信道，并分配业务信道的帧偏置。The control unit is used for establishing a traffic channel for the mobile station when the mobile station initiates a traffic call, and assigning a frame offset of the traffic channel.
进一步地，该基站进一步包括：Further, the base station further includes:
射频模块，用于接收移动台发出的射频信号，并发至为该移动台建立的业务信道；The radio frequency module is used to receive the radio frequency signal sent by the mobile station and send it to the traffic channel established for the mobile station;
所述信道单元包括：The channel unit includes:
解调模块，用于监测到所述业务信道接收到的射频信号，计时单元轮询到业务信道的帧偏置时，从所述业务信道接收到的射频信号中解调出业务帧；The demodulation module is used to monitor the radio frequency signal received by the traffic channel. When the timing unit polls the frame offset of the traffic channel, it demodulates the traffic frame from the radio frequency signal received by the traffic channel;
发送模块，用于解调出业务帧后，监测到计时单元轮询到所述发送偏置时，发送解调出的业务帧。The sending module is configured to send the demodulated service frame when it detects that the timing unit has polled the sending offset after the service frame is demodulated.
进一步地，所述计算单元包括：第一计算模块、第二计算模块和取余数模块；其中，Further, the calculation unit includes: a first calculation module, a second calculation module and a remainder module; wherein,
第一计算模块，用于计算业务信道的帧偏置减去要提前的帧偏置个数的差；The first calculation module is used to calculate the frame offset of the traffic channel minus the difference in the number of frame offsets to be advanced;
第二计算模块，用于将得到的差与可供基站分配的帧偏置的数目求和；The second calculation module is used for summing the obtained difference and the number of frame offsets available for distribution by the base station;
取余数模块，用于取算得的和除以可供基站分配的帧偏置的数目的余数，作为该业务信道对应的发送偏置。The module for obtaining a remainder is used to obtain a remainder obtained by dividing the calculated sum by the number of frame offsets available for distribution by the base station, and use it as the transmission offset corresponding to the traffic channel.
本发明所提供的减小媒体面链路时延的方法及基站，通过将业务信道的帧偏置提前若干个帧偏置后得到的帧偏置，作为该业务信道对应的发送偏置，进而将发送业务帧的时间提前了所述若干个帧偏置，减小了媒体面链路时延，操作简单，易于实现。The method and the base station for reducing the delay of the media plane link provided by the present invention use the frame offset obtained by advancing the frame offset of the traffic channel by several frame offsets as the corresponding transmission offset of the traffic channel, and then The time for sending service frames is advanced by the number of frame offsets, reducing the link time delay of the media plane, and the operation is simple and easy to implement.
附图说明 Description of drawings
图1为本发明实施例减小媒体面链路时延的方法的实现流程图；Fig. 1 is the realization flow chart of the method for reducing the time delay of media plane link according to the embodiment of the present invention;
图2为本发明实施例减小反向业务信道时延的基站的结构示意图。FIG. 2 is a schematic structural diagram of a base station for reducing reverse traffic channel delay according to an embodiment of the present invention.
具体实施方式 Detailed ways
本发明实施例减小媒体面链路时延的方法的实现流程如图1所示，包括以下步骤：The implementation process of the method for reducing the link delay of the media plane in the embodiment of the present invention is shown in Figure 1, including the following steps:
步骤101：基站顺序轮询各帧偏置。Step 101: the base station sequentially polls each frame offset.
这里，各帧偏置指可供基站分配的帧偏置，设其数目为N，则步骤101即为，基站从帧偏置0轮询至帧偏置(N-1)后，返回帧偏置0，重新轮询。而基站将各帧偏置分别分配给业务信道，在轮询至某帧偏置时，即对该帧偏置所属的业务信道发来的数据进行解调、发送等处理，使得各业务信道发来的数据分别在不同时刻占用资源，以避免拥塞现象。Here, each frame offset refers to the frame offset available for the base station to allocate, and its number is set to N, then
移动台发起业务呼叫时，本发明实施例包括以下步骤：When the mobile station initiates a service call, the embodiment of the present invention includes the following steps:
步骤102：基站为发起业务呼叫的移动台建立业务信道，并分配一个帧偏置作为建立的业务信道的帧偏置。Step 102: the base station establishes a traffic channel for the mobile station that initiates the traffic call, and assigns a frame offset as the frame offset of the established traffic channel.
这里，分配一个帧偏置作为建立的业务信道的帧偏置具体为：Here, assigning a frame offset as the frame offset of the established traffic channel is specifically:
基站由可供基站分配的帧偏置0至帧偏置(N-1)中选择一个帧偏置，作为建立的业务信道的帧偏置；其中，一个帧偏置可以作为多个业务信道的帧偏置，基站选择帧偏置时，选择对应的业务信道较少的帧偏置，以使得各帧偏置对应的业务信道数目相当，进而使得不同时刻需处理的数据量相差较小。The base station selects a frame offset from frame offset 0 to frame offset (N-1) that can be allocated by the base station as the frame offset of the established traffic channel; wherein, one frame offset can be used as the frame offset of multiple traffic channels Frame offset. When the base station selects a frame offset, it selects a frame offset corresponding to fewer traffic channels, so that the number of traffic channels corresponding to each frame offset is equal, so that the difference in the amount of data to be processed at different times is small.
步骤103：基站将业务信道的帧偏置提前若干个帧偏置后得到的帧偏置，作为该业务信道对应的发送偏置。Step 103: The base station advances the frame offset of the traffic channel by several frame offsets to obtain a frame offset as a transmission offset corresponding to the traffic channel.
其中，将业务信道的帧偏置提前若干个帧偏置后得到的帧偏置，作为该业务信道对应的发送偏置具体为：Among them, the frame offset obtained by advancing the frame offset of the traffic channel by several frame offsets, as the transmission offset corresponding to the traffic channel is specifically:
计算业务信道的帧偏置减去要提前的帧偏置个数的差，将得到的差与可供基站分配的帧偏置的数目求和；使用算得的和除以可供基站分配的帧偏置的数目，得到的余数即为该业务信道对应的发送偏置，表示为公式如下：Calculate the difference between the frame offset of the traffic channel minus the number of frame offsets to be advanced, and sum the difference with the number of frame offsets available for base station allocation; divide the calculated sum by the number of frames available for base station allocation The number of offsets, the remainder obtained is the transmission offset corresponding to the traffic channel, expressed as the following formula:
q＝(p-m+N)％Nq=(p-m+N)%N
其中，N为可供基站分配的帧偏置的数目；q为业务信道对应的发送偏置，取值范围为[0，N]；m为要提前的帧偏置个数，取值范围为[0，N]，可以根据需要减小媒体面链路时延的程度来设置，m越大，则媒体面链路时延越小；p为业务信道的帧偏置，取值范围为[0，N]。Among them, N is the number of frame offsets that can be allocated by the base station; q is the transmission offset corresponding to the traffic channel, and the value range is [0, N]; m is the number of frame offsets to be advanced, and the value range is [0, N], which can be set according to the degree of reducing the link delay of the media plane. The larger m is, the smaller the link delay of the media plane is; p is the frame offset of the traffic channel, and the value range is [ 0, N].
采用上述公式，p＞m时，算得的q为(p-m)，即将p提前m个帧偏置后的帧偏置；当p＜m时，算得的q为N-(p-m-1)，而信道板发送业务帧是在其解调出业务帧的后一次轮询时，因此，可看作先提前p个帧偏置，得到的帧偏置为0，剩余的p-m个由0提前至N-(p-m-1)来实现，即提前m个帧偏置，将发送业务帧的时刻从解调出业务帧的后一次轮询的帧偏置p，提前至解调出业务帧的本次轮询的帧偏置N-(p-m-1)。Using the above formula, when p>m, the calculated q is (p-m), that is, the frame offset after p is advanced by m frame offsets; when p<m, the calculated q is N-(p-m-1), and The channel board sends the service frame when it demodulates the last polling of the service frame. Therefore, it can be regarded as advancing p frame offsets first, and the obtained frame offset is 0, and the remaining p-m frames are advanced from 0 to N -(p-m-1) to achieve, that is, to advance the frame offset by m, and advance the time of sending the service frame from the frame offset p of the next polling of the demodulated service frame to the current time of the demodulated service frame Polling frame offset N-(p-m-1).
步骤104：移动台发出射频信号，基站接收所述射频信号，并发至所述业务信道；接收到所述射频信号后，业务信道在轮询到所述业务信道的帧偏置时，从接收到的射频信号中解调出业务帧。Step 104: The mobile station sends out a radio frequency signal, the base station receives the radio frequency signal, and sends it to the traffic channel; after receiving the radio frequency signal, the traffic channel polls the frame offset of the traffic channel, and starts The service frame is demodulated from the radio frequency signal.
步骤105：解调出业务帧后，业务信道在轮询到所述业务信道的发送偏置时，发送解调出的业务帧。Step 105: After the traffic frame is demodulated, the traffic channel sends the demodulated traffic frame when polling the transmission offset of the traffic channel.
这里，发送所述业务帧具体为：Here, sending the service frame is specifically:
将所述业务帧通过基站内部业务帧传输链路传输至基站内部的编解码器。The service frame is transmitted to the codec inside the base station through the service frame transmission link inside the base station.
本发明实施例减小媒体面链路时延的基站的结构如图2所示，包括：设置单元、计时单元、计算单元和信道单元；其中，The structure of the base station for reducing the link delay of the media plane in the embodiment of the present invention is shown in Figure 2, including: a setting unit, a timing unit, a calculation unit and a channel unit; wherein,
设置单元，用于设定要提前的帧偏置个数；The setting unit is used to set the number of frame offsets to be advanced;
计时单元，用于顺序轮询各帧偏置；A timing unit for sequentially polling the frame offsets;
计算单元，用于将业务信道的帧偏置提前若干个帧偏置后得到的帧偏置，作为该业务信道对应的发送偏置；A calculation unit, configured to advance the frame offset of the traffic channel by several frame offsets to obtain a frame offset as the corresponding transmission offset of the traffic channel;
信道单元，用于解调出所述业务信道的射频信号中的业务帧后，监测到计时单元轮询到所述发送偏置时，发送解调出的业务帧。The channel unit is configured to send the demodulated service frame when detecting that the timing unit has polled the sending offset after demodulating the service frame in the radio frequency signal of the service channel.
这里，该基站进一步包括：Here, the base station further includes:
控制单元，用于在移动台发起业务呼叫时，为该移动台建立业务信道，并分配业务信道的帧偏置。The control unit is used for establishing a traffic channel for the mobile station when the mobile station initiates a traffic call, and assigning a frame offset of the traffic channel.
进一步地，该基站进一步包括：Further, the base station further includes:
射频模块，用于接收移动台发出的射频信号，并发至为该移动台建立的业务信道；The radio frequency module is used to receive the radio frequency signal sent by the mobile station and send it to the traffic channel established for the mobile station;
所述信道单元包括：The channel unit includes:
解调模块，用于监测到所述业务信道接收到的射频信号，计时单元轮询到业务信道的帧偏置时，从所述业务信道接收到的射频信号中解调出业务帧；The demodulation module is used to monitor the radio frequency signal received by the traffic channel. When the timing unit polls the frame offset of the traffic channel, it demodulates the traffic frame from the radio frequency signal received by the traffic channel;
发送模块，用于解调出业务帧后，监测到计时单元轮询到所述发送偏置时，发送解调出的业务帧。The sending module is configured to send the demodulated service frame when it detects that the timing unit has polled the sending offset after the service frame is demodulated.
进一步地，所述计算单元包括：第一计算模块、第二计算模块和取余数模块；其中，Further, the calculation unit includes: a first calculation module, a second calculation module and a remainder module; wherein,
第一计算模块，用于计算业务信道的帧偏置减去要提前的帧偏置个数的差；The first calculation module is used to calculate the frame offset of the traffic channel minus the difference in the number of frame offsets to be advanced;
第二计算模块，用于将所述第一计算模块算得的差与可供基站分配的帧偏置的数目的求和；A second calculation module, configured to sum the difference calculated by the first calculation module and the number of frame offsets that can be allocated by the base station;
取余数模块，用于取所述第二计算模块算得的和除以可供基站分配的帧偏置的数目的余数，作为该业务信道对应的发送偏置。The remainder module is configured to take the remainder obtained by dividing the sum calculated by the second calculation module by the number of frame offsets that can be allocated by the base station, and use it as the transmission offset corresponding to the traffic channel.
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。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.
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| CN1235441A (en) * | 1998-04-22 | 1999-11-17 | 日本电气株式会社 | Frame offset setting arrangement and frame offset setting method |
| CN1402568A (en) * | 2001-08-16 | 2003-03-12 | 华为技术有限公司 | Frame offset allocation method |
| KR20040034741A (en) * | 2002-10-15 | 2004-04-29 | 엘지전자 주식회사 | Method of allotting base station frame offset using hashing |
| CN101217718A (en) * | 2008-01-16 | 2008-07-09 | 中兴通讯股份有限公司 | A Method for Automatically Adjusting Network Delay of ABIS Port |
| CN101534574A (en) * | 2008-03-13 | 2009-09-16 | 中兴通讯股份有限公司 | Method for distributing frame offset in CDMA group system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1235441A (en) * | 1998-04-22 | 1999-11-17 | 日本电气株式会社 | Frame offset setting arrangement and frame offset setting method |
| CN1402568A (en) * | 2001-08-16 | 2003-03-12 | 华为技术有限公司 | Frame offset allocation method |
| KR20040034741A (en) * | 2002-10-15 | 2004-04-29 | 엘지전자 주식회사 | Method of allotting base station frame offset using hashing |
| CN101217718A (en) * | 2008-01-16 | 2008-07-09 | 中兴通讯股份有限公司 | A Method for Automatically Adjusting Network Delay of ABIS Port |
| CN101534574A (en) * | 2008-03-13 | 2009-09-16 | 中兴通讯股份有限公司 | Method for distributing frame offset in CDMA group system |
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