WO2016037487A1 - 一种gsm系统中小区切换的方法及基站设备 - Google Patents

一种gsm系统中小区切换的方法及基站设备 Download PDF

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WO2016037487A1
WO2016037487A1 PCT/CN2015/077517 CN2015077517W WO2016037487A1 WO 2016037487 A1 WO2016037487 A1 WO 2016037487A1 CN 2015077517 W CN2015077517 W CN 2015077517W WO 2016037487 A1 WO2016037487 A1 WO 2016037487A1
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base station
time window
gap
dtx
command
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PCT/CN2015/077517
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English (en)
French (fr)
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郭锋
张明镜
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中兴通讯股份有限公司
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Priority to EP15840199.2A priority Critical patent/EP3193535B1/en
Publication of WO2016037487A1 publication Critical patent/WO2016037487A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/023—Buffering or recovering information during reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]

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  • This document relates to the technical field of cell handover using the call gap in the GSM (Global System for Mobile Communication), and more particularly to a scheme for improving the call perception of a wireless user by using a call gap for cell handover.
  • GSM Global System for Mobile Communication
  • GSM mobile communication systems attach great importance to the improvement of user perception. Handoffs between different cells often occur during the user's movement.
  • the GSM user performs a handover during the call, and the controller sends a handover command, and the base station immediately sends the handover command to the mobile phone without waiting for a buffer mechanism.
  • the related GSM system switching process is shown in Figure 1, and includes the following operations:
  • the MS mobile station transmits a measurement report (Measurement Report) to the BTS1 (base transceiver station) on the SACCH (Slow Associated Control Channel) of the air interface, and the BTS1 is forwarded to the BSC (Base Station Controller). ;
  • the BSC After receiving the Measurement Report, the BSC determines that the MS needs to be handed over to other cells in the BSC according to the information of the Measurement Report, and the BSC sends a Channel Activation to the BTS2 of the target cell to activate the channel.
  • the BTS2 After receiving the Channel Activation, if the channel type is correct, the BTS2 opens the power amplifier on the designated channel, and the uplink starts to receive the information, and sends a Channel Activation Acknowledge to the BSC;
  • the BSC After receiving the Channel Activation Acknowledge of BTS2, the BSC sends a Handover CMD to BTS1, which is forwarded to the MS by BTS1.
  • the MS After receiving the Handover CMD, the MS attempts to access the BTS2 and sends a Handover Access to the BTS2.
  • the BTS2 After receiving the Handover Access of the MS, the BTS2 sends a Handover Detect to the BSC to notify Receiving a handover access message;
  • BTS2 For asynchronous handover, that is, BTS1 and BTS2 belong to different base stations, BTS2 sends Handover Detect and also sends PHY INFO to the MS, the message includes synchronization information that the MS can correctly access, etc.; but if it is synchronous handover, ie BTS1 and When the BTS2 belongs to the same base station, no PHY INFO message is sent.
  • the MS For asynchronous handover, after receiving the PHY INFO, the MS sends the SABM to the BTS2; but for synchronous handover, the MS will send the SABM frame to the BTS2 soon after transmitting the Handover Access.
  • BTS2 After receiving the first SABM frame, BTS2 will send EST IND to the BSC to inform the BSC of the establishment of the radio link.
  • the BTS2 responds to the UA frame to the MS, and informs the MS that the radio link layer is established.
  • the MS sends Handover Complete to BTS2, and BTS2 forwards Handover Complete to the BSC to notify the BSC that the handover is complete.
  • the BSC will send Handover Performed to the MSC to inform the MSC to perform a handover, and the BSC will initiate a local release procedure for the old channel of the BTS1 to release the channel.
  • the technical problem to be solved by the present invention is to provide a method for cell handover in a GSM system and a base station device, so as to solve the problem of damage to the user's call voice during the cell handover process of the related art.
  • a method of cell handover in a Global System for Mobile Communications (GSM) system comprising:
  • the base station After receiving the handover command sent by the network side, the base station determines whether the base station is currently in a gap of downlink discontinuous transmission (DTX);
  • DTX downlink discontinuous transmission
  • the base station If the base station is currently in the gap of DTX, the base station immediately sends the handover command If the user is in the non-DTX gap, the base station first caches the handover command, and then sends the cached handover command to the target user according to the timing of the cache time window selection.
  • the base station first caches the handover command, and then sends the cached handover command to the target user according to the buffer time window selection opportunity:
  • the base station buffers the switching command, and determines whether a DTX gap is waited in a preset buffer time window;
  • the base station If a DTX gap is waited in a preset buffer time window, the base station sends the handover command in the gap of the DTX;
  • the base station If the gap of one DTX is not waited in the preset buffer time window, the base station sends the handover command when the preset buffer time window expires.
  • the method further includes:
  • the base station adjusts the size of the buffer time window in real time.
  • the step of the base station adjusting the size of the cache time window in real time includes:
  • the base station captures the number of successful times, the number of times the timing capture fails, and the number of times the switching command is immediately issued;
  • the capturing success of the timing means that after the base station buffers the switching command, the switching command is sent in a gap of DTX in a preset buffer time window;
  • the timing capture failure means that after the base station caches the handover command, the DTX gap is not waited in the preset buffer time window, and the handover command is sent when the preset cache time window expires.
  • the initial configuration range of the buffer time window is 500 ms to 3000 ms.
  • a base station device includes a baseband processing unit and a sending unit, wherein:
  • the baseband processing unit is configured to: after the base station device receives the handover command sent by the network side, determine whether it is currently in a gap of downlink discontinuous transmission (DTX);
  • DTX downlink discontinuous transmission
  • the sending unit if the base station is currently in the gap of the DTX, immediately sends the handover command to the target user; if the base station is currently in a non-DTX gap, the switching command is first cached, and then according to the The cache time window is selected to send the cached switch command to the target user.
  • the sending unit is configured to first cache the switching command when the current is in a non-DTX gap, and then send the cache switching command to the target user according to the timing of the buffer time window selection:
  • the switching command is issued when the preset buffer time window expires.
  • the device further includes a configuration unit,
  • the configuration unit is configured to: adjust the size of the cache time window in real time.
  • the configuration unit includes a statistics unit and a buffer time window adjustment unit, where:
  • the statistic unit is configured to: count the number of successful times, the number of times the timing capture fails, and the number of times the switching command is immediately issued during the set time period;
  • the buffer time window adjusting unit is configured to: adjust a size of the buffer time window according to a ratio between a number of times of capturing success, a number of times of timing capture failure, and a number of times of immediately issuing a switching command;
  • the timing of the capture succeeds, that is, after the switching command is cached, the switching command is sent in a gap of DTX in a preset buffer time window;
  • the timing capture failure means that after the switching command is cached, a gap of DTX is not waited in a preset buffer time window, and the switching command is issued when a preset buffer time window expires.
  • the initial configuration range of the buffer time window is 500 ms to 3000 ms.
  • a computer program comprising program instructions that, when executed by a base station, cause the base station to perform a method of cell handover in any of the above-described GSM systems.
  • the technical solution of the present application performs the handover by using the voice transmission gap of the call process, thereby avoiding the loss of the voice frame in the handover process to some extent. It is expected that the improvement of network voice quality will be clear after the implementation of this measure.
  • FIG. 2 is a schematic diagram of a handover processing point added in an embodiment of the present invention.
  • FIG. 3 is a flowchart of a handover command control process according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of an apparatus of a base station device according to an embodiment of the present invention.
  • the inventor of the present application proposes that the base station can use the handover command sent by stealing the frame, that is, by finding the GSM user call gap, and then slightly adjusting the handover execution timing, and using the pause interval in the user call to identify the voice frame to be transmitted is important.
  • the frame is also a non-important frame moment; to perform the handover of the GSM system, thereby reducing the damage of the voice quality, thereby improving the user's voice quality.
  • the embodiment provides a method for cell handover in a GSM system, mainly Including the following operations:
  • the base station After receiving the handover command sent by the network side, the base station determines whether it is currently in the gap of the downlink DTX;
  • the base station If the current DTX is in the gap, the base station immediately sends the handover command to the corresponding user; if the current is in the non-DTX gap, the base station first caches the handover command, and then selects the timing according to the cache time window to issue the cached handover command. Give the corresponding user.
  • the corresponding user may be the user in the call, that is, the target user, to be switched to the target cell time slot.
  • the base station sends a handover command by using a buffer time window to select a timing, mainly to capture a DTX gap, acquire an important frame, a non-significant frame state, and finally determine a timing for transmitting the handover command.
  • the base station buffers the switching command, and determines whether a DTX gap is waited in a preset buffer time window; if a DTX gap is waited in a preset buffer time window, the DTX gap is sent.
  • the switching command if a gap of DTX is not waited in the preset buffer time window, the switching command is issued when the preset buffer time window expires.
  • the base station can also adjust the size of the buffer time window in real time, for example, manually or automatically.
  • the base station can adaptively adjust to a reasonable buffer time window according to the effect of the selection opportunity (measured from the proportion of statistically capturing the successful failure of the DTX gap), so that the capture failure count ratio is the lowest.
  • the base station captures the number of successful times, the number of times of timing capture failure, and the number of times the handover command is immediately issued during the set time period;
  • the timing capture success means that after the base station caches the handover command, the base station waits for a DTX gap in a preset buffer time window, and issues a handover command;
  • the timing capture failure means that after the base station caches the handover command, the DTX gap is not waited in the preset buffer time window, and the handover command is issued when the preset cache time window expires.
  • the initial configuration range of the buffer time window is preferably 500 ms to 3000 ms.
  • this embodiment does not change the original signaling and cut by the GSM protocol. Change the process order. Only the process of switching command buffer analysis processing is added to the base station side. For the modification, please refer to FIG. 2 (the embodiment of the present invention adds a handover processing point).
  • PartI (the main process of switching control processing):
  • Step 301 The mobile phone user in the mobile phone connects the phone according to the normal situation, and the test report is normally reported.
  • Step 302 The network side base station controller (BSC) determines that the handover needs to be performed at this time, finds a suitable target cell, and sends a handover command to the mobile phone user through the controller base station interface (Abis port) under the source cell.
  • BSC network side base station controller
  • Step 303 After receiving the handover command on the Abis port, the base station determines whether it is currently in the gap of the downlink DTX. If yes, go to step 307; otherwise, go to step 304;
  • the baseband processing part of the base station has the capability to acquire the information of the current voice frame.
  • the current handover command is ready to be sent, it is determined whether the current voice frame is an important voice frame through the gap of the downlink DTX, because only DTX gap transmission is performed during the call.
  • the voice frame is a non-significant frame, that is, when the voice is in the gap of the downlink DTX, the transmitted voice frame is a non-significant frame.
  • the transmitted voice frame is an important frame, and the process proceeds to step 304, and the switch command is cached before waiting for the opportunity to be sent.
  • Step 304 Cache the current switching command, wait for a time window (the window size range can be configured from 500ms to 3000ms, and the default is from 500ms), and determine whether a DTX gap is waited before the waiting time window expires. If yes, perform step 305; otherwise, skip to step 306;
  • Step 305 The cache switching command is sent, and the counter that captures the success is recorded. Go to step 308.
  • Step 306 The cache switching command is sent, and a counter that fails to capture the timing is recorded. Go to step 308.
  • Step 307 The un-cached switching command is sent, and the count of the switching command is immediately sent. Device.
  • Step 308 The base station system automatically counts the hourly capture success counter, captures the failure counter, immediately issues the proportion of the counter, and adaptively adjusts the buffer time window. The setting that makes the capture failure count ratio the lowest is optimal.
  • Time window adjustment method in a statistical period of hourly, if the initial adjustment value is gradually adjusted from 500ms, the current failure ratio is 10%, and the time window will gradually increase, and the failure ratio will gradually decrease. Until a certain adjustment to 1200ms, the failure rate is 5%, continue to adjust to 1300ms, the failure rate is increased, then 1200ms is the optimal time window setting here. 1200ms is used as the actual time window. In the following time, the system continues to detect, according to the 600ms--3000ms traversal cycle, if a statistical period, find a better failure ratio within this hour. Then refresh this time window setting.
  • the embodiment provides a base station device. As shown in FIG. 4, the method of the foregoing Embodiment 1 can be implemented, and at least includes the following units.
  • the baseband processing unit 401 determines, after the base station device receives the handover command sent by the network side, whether it is currently in the gap of the downlink DTX;
  • the sending unit 402 if currently in the gap of the DTX, immediately sends the switching command to the corresponding user; if the current is in the non-DTX gap, the switching command is first cached, and then the timing is selected according to the buffer time window. The cached switch command is sent to the corresponding user.
  • the sending unit caches the switching command, it is determined whether a DTX gap is waited in the preset buffer time window;
  • the switching command is issued when the preset buffer time window expires.
  • the preferred solution proposes to add a configuration unit 403 for adjusting the size of the cache time window in real time.
  • the configuration unit can adjust the size of the cache time window in real time according to user instructions.
  • the size of the cache time window can also be adjusted by adaptive adjustment.
  • the initial configuration range of the buffer time window is preferably 500ms to 3000ms.
  • the configuration module 403 can be divided into the following modules:
  • the statistics module 4031 in the set time period, counts the number of successful times, the number of times the timing capture fails, and the number of times the switching command is immediately issued;
  • the buffer time window adjustment module 4032 adjusts the size of the buffer time window according to the ratio between the number of successful capture times, the number of times the timing capture fails, and the number of times the switch command is immediately issued.
  • the timing of the capture in the embodiment is successful. After the switching command is cached, the switching command is issued in a gap of DTX in a preset buffer time window.
  • the timing capture failure means that after the switching command is cached, a gap of DTX is not waited in the preset buffer time window, and the switching command is issued when the preset buffer time window expires.
  • the technical solution of the present application utilizes the voice gap DTX during a call, and refers to the state of the DTX before the handover command is sent by the base station to the mobile phone. If necessary, the timing of the handover is slightly adjusted, and the buffering time is just right.
  • the DTX gap is used for the handover command transmission, so that the mobile phone performs the handover during the DTX interval period, thereby avoiding the wasted loss of the voice frame and improving the user's call perception.
  • the technical solution of the present application performs the handover by using the voice transmission gap of the call process, thereby avoiding the loss of the voice frame in the handover process to some extent. It is expected that the improvement of network voice quality will be clear after the implementation of this measure. Therefore, the present invention has strong industrial applicability.

Abstract

一种GSM系统中小区切换的方法及基站设备，涉及GSM移动通讯领域。本发明方法包括：基站接收到网络侧发送的切换命令后，判断当前是否处于下行不连续发送(DTX)的间隙；若当前处于DTX的间隙，则所述基站立刻将所述切换命令下发给对应的用户；若当前处于非DTX的间隙，则所述基站先缓存所述切换命令，再根据缓存时间窗选择时机，将缓存的切换命令下发给对应的用户。本发明还公开了一种基站设备。本申请技术方案利用通话过程的语音传输间隙执行跨区切换，从而一定程度避免了话音帧在切换过程中的损失。预计实施该措施之后，对网络话音质量的改善是明确的。

Description

一种GSM系统中小区切换的方法及基站设备 技术领域
本文涉及GSM(Global System for Mobile Communication，全球移动通信系统)中利用通话间隙进行小区切换的技术领域，尤其涉及一种利用通话间隙进行小区切换来提高无线用户通话感知的方案。
背景技术
GSM移动通讯系统作为全世界应用最广泛，用户最多的系统，各国大运营商都非常重视用户感知的提升。用户在移动的过程中，不同蜂窝小区之间的跨区切换经常发生。相关技术上，GSM用户在通话过程中的跨区切换，控制器发送切换命令，基站会立即将切换命令下发给手机，而没有等待缓冲的机制。
相关GSM系统切换处理流程如图1所示，包括如下操作：
MS(移动台)在空中接口的SACCH(Slow Associated Control Channel，慢速随路控制信道)上向BTS1(基站收发信台)发送测量报告(Measurement Report)，BTS1再转发给BSC(基站控制器)；
BSC收到Measurement Report后，根据Measurement Report的信息，判断需要将该MS切换到BSC内的其他小区，则BSC向目标小区的BTS2发送Channel Activation，激活信道；
BTS2收到Channel Activation后，如果信道类型正确，则在指定信道上开功率放大器，上行开始接收信息，并向BSC发送Channel Activation Acknowledge；
BSC收到BTS2的Channel Activation Acknowledge后，发送Handover CMD给BTS1，由BTS1转发给MS。
MS接收到Handover CMD后，在BTS2尝试接入，发送Handover Access给BTS2；
BTS2收到MS的Handover Access后发送Handover Detect给BSC，通知 收到切换接入消息；
对于异步切换，即BTS1和BTS2是属于不同的基站，BTS2发送Handover Detect的同时也向MS发送PHY INFO，该消息包括MS能正确接入的同步信息等内容；但如果是同步切换，即BTS1和BTS2属于相同基站时，不会有PHY INFO消息的下发。
对异步切换，MS接收到PHY INFO后，发送SABM到BTS2；但对于同步切换，MS在发送Handover Access后很快就会发送SABM帧给BTS2。
BTS2收到第一个SABM帧后，将发送EST IND给BSC，通知BSC无线链路建立。
同时BTS2给MS回应UA帧，通知MS无线链路层建立。
至此，MS发送Handover Complete给BTS2，BTS2转发Handover Complete给BSC，通知BSC切换完成。
BSC将发送Handover Performed给MSC，通知MSC进行了一次切换，同时BSC将对BTS1的老信道发起本地释放流程，释放信道。
由于没有考虑到此时是否正在通话帧传输中，还是处于DTX(discontinuous Transmission，不连续发送)间隙，这样可能对用户话音感受是有一定损伤。
发明内容
本发明所要解决的技术问题是提供一种GSM系统中小区切换的方法及基站设备，以解决相关技术小区切换过程中对用户通话语音造成损伤的问题。
为了解决上述技术问题，采用如下技术方案：
一种全球移动通信系统(GSM)系统中小区切换的方法，该方法包括：
基站接收到网络侧发送的切换命令后，判断所述基站当前是否处于下行不连续发送(DTX)的间隙；
若所述基站当前处于DTX的间隙，则所述基站立刻将所述切换命令下发 给目标用户；若当前处于非DTX的间隙，则所述基站先缓存所述切换命令，再根据缓存时间窗选择时机，将缓存的切换命令下发给所述目标用户。
可选地，若所述基站当前处于非DTX的间隙，所述基站先缓存所述切换命令，再根据缓存时间窗选择时机，将缓存的切换命令下发给目标用户的步骤包括：
所述基站缓存所述切换命令，并判断在预设的缓存时间窗内是否等到一个DTX的间隙；
如果在预设的缓存时间窗内等到一个DTX的间隙，则所述基站在该DTX的间隙下发所述切换命令；
如果在预设的缓存时间窗内未等到一个DTX的间隙，则所述基站在预设的缓存时间窗到期时下发所述切换命令。
可选地，该方法还包括：
所述基站实时调整缓存时间窗的大小。
可选地，所述基站实时调整缓存时间窗的大小的步骤包括：
所述基站在设定时间段内，统计时机捕捉成功的次数、时机捕捉失败的次数以及立即下发切换命令的次数；
根据时机捕捉成功的次数、时机捕捉失败的次数以及立即下发切换命令的次数之间的比例大小，调整所述缓存时间窗的大小；
其中，所述时机捕捉成功是指，所述基站缓存所述切换命令后，在预设的缓存时间窗内等到一个DTX的间隙，下发所述切换命令；
所述时机捕捉失败是指，所述基站缓存所述切换命令后，在预设的缓存时间窗内未等到一个DTX的间隙，在预设的缓存时间窗到期时下发所述切换命令。
可选地，所述缓存时间窗的初始配置范围为500ms～3000ms。
一种基站设备，该设备包括基带处理单元和下发单元，其中：
所述基带处理单元设置成：在本基站设备接收到网络侧发送的切换命令后，判断当前是否处于下行不连续发送(DTX)的间隙；
所述下发单元，若所述基站当前处于DTX的间隙，则立刻将所述切换命令下发给目标用户；若所述基站当前处于非DTX的间隙，则先缓存所述切换命令，再根据缓存时间窗选择时机，将缓存的切换命令下发给所述目标用户。
可选地，所述下发单元设置成按照如下方式在当前处于非DTX的间隙时，先缓存所述切换命令，再根据缓存时间窗选择时机，将缓存的切换命令下发给目标用户：
缓存所述切换命令，并判断在预设的缓存时间窗内是否等到一个DTX的间隙；
如果在预设的缓存时间窗内等到一个DTX的间隙，则在该DTX的间隙下发所述切换命令；
如果在预设的缓存时间窗内未等到一个DTX的间隙，则在预设的缓存时间窗到期时下发所述切换命令。
可选地，该设备还包括配置单元，
该配置单元设置成：实时调整缓存时间窗的大小。
可选地，所述配置单元包括统计单元和缓存时间窗调整单元，其中：
所述统计单元设置成：在设定时间段内，统计时机捕捉成功的次数、时机捕捉失败的次数以及立即下发切换命令的次数；
所述缓存时间窗调整单元设置成：根据时机捕捉成功的次数、时机捕捉失败的次数以及立即下发切换命令的次数之间的比例大小，调整所述缓存时间窗的大小；
其中，所述时机捕捉成功是指，缓存所述切换命令后，在预设的缓存时间窗内等到一个DTX的间隙，下发所述切换命令；
所述时机捕捉失败是指，缓存所述切换命令后，在预设的缓存时间窗内未等到一个DTX的间隙，在预设的缓存时间窗到期时下发所述切换命令。
可选地，所述缓存时间窗的初始配置范围为500ms～3000ms。
一种计算机程序，包括程序指令，当该程序指令被基站执行时，使得该基站可执行上述任意的GSM系统中小区切换的方法。
一种载有所述的计算机程序的载体。
本申请技术方案利用通话过程的语音传输间隙执行跨区切换，从而一定程度避免了话音帧在切换过程中的损失。预计实施该措施之后，对网络话音质量的改善是明确的。
附图概述
图1为相关技术GSM系统切换处理流程图；
图2本发明实施例增加的切换处理点示意图；
图3为本发明实施例切换命令控制处理流程图；
图4为本发明实施例的基站设备的装置结构示意图。
本发明的较佳实施方式
下文将结合附图对本发明技术方案作进一步详细说明。需要说明的是，在不冲突的情况下，本申请的实施例和实施例中的特征可以任意相互组合。
实施例1
本申请发明人提出，基站可以利用偷帧发送的切换命令，即通过找出GSM用户通话间隙，然后轻微调整切换执行时机，利用用户通话中的停顿间隙，识别出即将要发送的语音帧是重要帧还是非重要帧时刻；来执行GSM系统的跨区切换，从而减少对话音质量的损伤，进而改善用户话质感受。
基于上述思想，本实施例提供一种GSM系统中小区切换的方法，主要 包括如下操作：
基站接收到网络侧发送的切换命令后，判断当前是否处于下行DTX的间隙；
若当前处于DTX的间隙，则基站立刻将切换命令下发给对应的用户；若当前处于非DTX的间隙，则基站先缓存切换命令，再根据缓存时间窗选择时机，将缓存的切换命令下发给对应的用户。
其中，对应的用户可以是待切换到目标小区时隙的正在通话中的用户，即目标用户。
其中，基站通过缓存时间窗选择时机发送切换命令，主要是捕捉DTX间隙，获取重要帧、非重要帧状态，最终确定发送切换命令的时机。具体地，基站缓存所述切换命令，并判断在预设的缓存时间窗内是否等到一个DTX的间隙；如果在预设的缓存时间窗内等到一个DTX的间隙，则在该DTX的间隙下发所述切换命令；如果在预设的缓存时间窗内未等到一个DTX的间隙，则在预设的缓存时间窗到期时下发所述切换命令。
另外，基站还可以实时调整缓存时间窗的大小，例如，手动或自动方式调整。优选地，基站可以根据选择时机的效果(从统计捕捉DTX间隙成功失败的比例来衡量)，自适应调整到合理的缓存时间窗，使得捕捉失败计数比例最低。
具体地，基站在设定时间段内，统计时机捕捉成功的次数、时机捕捉失败的次数以及立即下发切换命令的次数；
根据时机捕捉成功的次数、时机捕捉失败的次数以及立即下发切换命令的次数之间的比例大小，调整所述缓存时间窗的大小；
其中，时机捕捉成功指，基站缓存所述切换命令后，在预设的缓存时间窗内等到一个DTX的间隙，下发切换命令；
时机捕捉失败指，基站缓存切换命令后，在预设的缓存时间窗内未等到一个DTX的间隙，在预设的缓存时间窗到期时下发切换命令。
而本实施例中，缓存时间窗的初始配置范围优选为500ms～3000ms。
从上述方法可以看出，本实施例不改变GSM协议规定的原有信令及切 换流程次序。只是在基站侧附加切换命令缓冲分析处理的过程。修改处请参考附图2(本发明实施例增加切换处理点)。
下面结合图3，说明上述优选方案实现小区切换的具体过程，包括如下操作：
PartI(切换控制处理主要过程)：
步骤301：移动中的手机用户按正常情况接通电话，测试报告正常上报中。
步骤302：网络侧基站控制器(BSC)判断这时需要进行跨区切换，找到合适的目标小区，在源小区下对手机用户通过控制器基站接口(Abis口)发送切换命令。
第骤303：基站在Abis口接到切换命令后，判断当前是否处在下行DTX的间隙，如果是，执行步骤307；否则跳到步骤304；
具体地，基站的基带处理部分有能力获取当前话音帧的信息，当前切换命令准备下发时，通过下行DTX的间隙判断当前话音帧是否是重要话音帧，这是因为通话期间，只有DTX间隙传送的话音帧为非重要帧，即处于下行DTX的间隙时，传送的语音帧为非重要帧，此时可以进入步骤307直接下发切换命令。相反地，不是处于下行DTX的间隙时，传送的语音帧为重要帧，需要进入步骤304，先缓存切换命令后等待时机下发。
步骤304：缓存当前的切换命令，等待一个时间窗(窗口大小范围可以系统配置500ms～3000ms，默认从500ms开始)，判断在等待时间窗到期前是否等到一个DTX间隙？如果是，执行第步骤305；否则跳到步骤306；
PartII(通过记录捕捉计数反馈来进一步优化缓存时间窗)：
步骤305：把缓存的切换命令下发，记录捕捉时机成功的计数器。转步骤308。
步骤306：把缓存的切换命令下发，记录捕捉时机失败的计数器。转步骤308。
步骤307：把未经缓存的切换命令下发，记录切换命令立即下发的计数 器。
步骤308：基站系统自动统计每小时捕捉成功计数器，捕捉失败计数器，立即下发计数器所占比例大小，自适应调整缓存时间窗。使得捕捉失败计数比例最低的设置就是最优的。
时间窗调整方法，此处进一步举例说明：以每小时为一统计周期，如果从默认起始值500ms开始逐渐调整，当前失败比例为10％，以后时间窗逐渐增大，失败比例会逐渐降低，直到某次调整到1200ms，失败比例为5％，继续调整到1300ms，失败比例反而升高，那么1200ms就是此处最优的时间窗设置。1200ms就作为实际生效的时间窗。在后面的时间内，系统继续探测，按照600ms--3000ms遍历循环，如果某个统计周期，这一小时内找到更优的失败比例。则刷新这个时间窗设置。
实施例2
本实施例提供一种基站设备，如图4所示，其可以实现上述实施例1的方法，其至少包括如下各单元。
基带处理单元401，在本基站设备接收到网络侧发送的切换命令后，判断当前是否处于下行DTX的间隙；
下发单元402，若当前处于DTX的间隙，则立刻将所述切换命令下发给对应的用户；若当前处于非DTX的间隙，则先缓存所述切换命令，再根据缓存时间窗选择时机，将缓存的切换命令下发给对应的用户。
具体地，上述下发单元缓存切换命令后，判断在预设的缓存时间窗内是否等到一个DTX的间隙；
如果在预设的缓存时间窗内等到一个DTX的间隙，则在该DTX的间隙下发所述切换命令；
如果在预设的缓存时间窗内未等到一个DTX的间隙，则在预设的缓存时间窗到期时下发所述切换命令。
另外，优选方案提出，增加配置单元403，用于实时调整缓存时间窗的大小。具体地，该配置单元可以根据用户指令实时调整缓存时间窗的大小， 也可以采用自适应调整的方式调整缓存时间窗的大小。而缓存时间窗的初始配置范围优选为500ms～3000ms。
其中，配置单元403采用自适应调整的方式调整缓存时间窗的大小时，可以分为如下模块：
统计模块4031，在设定时间段内，统计时机捕捉成功的次数、时机捕捉失败的次数以及立即下发切换命令的次数；
缓存时间窗调整模块4032，根据时机捕捉成功的次数、时机捕捉失败的次数以及立即下发切换命令的次数之间的比例大小，调整缓存时间窗的大小。
要说明的是，本实施例中涉及的时机捕捉成功指，缓存所述切换命令后，在预设的缓存时间窗内等到一个DTX的间隙，下发所述切换命令。时机捕捉失败指，缓存所述切换命令后，在预设的缓存时间窗内未等到一个DTX的间隙，在预设的缓存时间窗到期时下发所述切换命令。
由于上述基站设备可实现上述实施例1的方法，故各单元的详细操作可参见上述实施例1的相应内容，在此不再赘述。
从上述实施例可以看出，本申请技术方案利用通话时的语音间隙DTX期间，在切换命令由基站下发给手机之前，参考DTX的状态，必要时轻微调整切换发生时机，缓冲一定时间，恰好利用DTX间隙进行切换命令发送，使得手机处在DTX间隔时期执行切换，进而避免了语音帧的浪费丢失，改善了用户的通话感知。
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/单元可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。本申请不限制于任何特定形式的硬件和软件的结合。
以上所述，仅为本发明的较佳实例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
工业实用性
本申请技术方案利用通话过程的语音传输间隙执行跨区切换，从而一定程度避免了话音帧在切换过程中的损失。预计实施该措施之后，对网络话音质量的改善是明确的。因此本发明具有很强的工业实用性。

Claims (12)

  1. 一种全球移动通信系统(GSM)系统中小区切换的方法，该方法包括：
    基站接收到网络侧发送的切换命令后，判断所述基站当前是否处于下行不连续发送(DTX)的间隙；
    若所述基站当前处于DTX的间隙，则所述基站立刻将所述切换命令下发给目标用户；若当前处于非DTX的间隙，则所述基站先缓存所述切换命令，再根据缓存时间窗选择时机，将缓存的切换命令下发给所述目标用户。
  2. 如权利要求1所述的GSM系统中小区切换的方法，其中，若所述基站当前处于非DTX的间隙，所述基站先缓存所述切换命令，再根据缓存时间窗选择时机，将缓存的切换命令下发给目标用户的步骤包括：
    所述基站缓存所述切换命令，并判断在预设的缓存时间窗内是否等到一个DTX的间隙；
    如果在预设的缓存时间窗内等到一个DTX的间隙，则所述基站在该DTX的间隙下发所述切换命令；
    如果在预设的缓存时间窗内未等到一个DTX的间隙，则所述基站在预设的缓存时间窗到期时下发所述切换命令。
  3. 如权利要求2所述的GSM系统中小区切换的方法，该方法还包括：
    所述基站实时调整缓存时间窗的大小。
  4. 如权利要求3所述的GSM系统中小区切换的方法，其中，所述基站实时调整缓存时间窗的大小的步骤包括：
    所述基站在设定时间段内，统计时机捕捉成功的次数、时机捕捉失败的次数以及立即下发切换命令的次数；
    根据时机捕捉成功的次数、时机捕捉失败的次数以及立即下发切换命令的次数之间的比例大小，调整所述缓存时间窗的大小；
    其中，所述时机捕捉成功是指，所述基站缓存所述切换命令后，在预设的缓存时间窗内等到一个DTX的间隙，下发所述切换命令；
    所述时机捕捉失败是指，所述基站缓存所述切换命令后，在预设的缓存 时间窗内未等到一个DTX的间隙，在预设的缓存时间窗到期时下发所述切换命令。
  5. 如权利要求1至4任一项所述的GSM系统中小区切换的方法，其中，
    所述缓存时间窗的初始配置范围为500ms～3000ms。
  6. 一种基站设备，该设备包括基带处理单元和下发单元，其中：
    所述基带处理单元设置成：在本基站设备接收到网络侧发送的切换命令后，判断当前是否处于下行不连续发送(DTX)的间隙；
    所述下发单元，若所述基站当前处于DTX的间隙，则立刻将所述切换命令下发给目标用户；若所述基站当前处于非DTX的间隙，则先缓存所述切换命令，再根据缓存时间窗选择时机，将缓存的切换命令下发给所述目标用户。
  7. 如权利要求6所述的基站设备，其中，所述下发单元设置成按照如下方式在当前处于非DTX的间隙时，先缓存所述切换命令，再根据缓存时间窗选择时机，将缓存的切换命令下发给目标用户：
    缓存所述切换命令，并判断在预设的缓存时间窗内是否等到一个DTX的间隙；
    如果在预设的缓存时间窗内等到一个DTX的间隙，则在该DTX的间隙下发所述切换命令；
    如果在预设的缓存时间窗内未等到一个DTX的间隙，则在预设的缓存时间窗到期时下发所述切换命令。
  8. 如权利要求7所述的基站设备，该设备还包括配置单元，
    该配置单元设置成：实时调整缓存时间窗的大小。
  9. 如权利要求8所述的基站设备，其中，所述配置单元包括统计单元和缓存时间窗调整单元，其中：
    所述统计单元设置成：在设定时间段内，统计时机捕捉成功的次数、时机捕捉失败的次数以及立即下发切换命令的次数；
    所述缓存时间窗调整单元设置成：根据时机捕捉成功的次数、时机捕捉失败的次数以及立即下发切换命令的次数之间的比例大小，调整所述缓存时 间窗的大小；
    其中，所述时机捕捉成功是指，缓存所述切换命令后，在预设的缓存时间窗内等到一个DTX的间隙，下发所述切换命令；
    所述时机捕捉失败是指，缓存所述切换命令后，在预设的缓存时间窗内未等到一个DTX的间隙，在预设的缓存时间窗到期时下发所述切换命令。
  10. 如权利要求6至9中任一项所述的基站设备，其中，
    所述缓存时间窗的初始配置范围为500ms～3000ms。
  11. 一种计算机程序，包括程序指令，当该程序指令被基站执行时，使得该基站可执行如权利要求1-5中任一项所述的GSM系统中小区切换的方法。
  12. 一种载有如权利要求11所述的计算机程序的载体。
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CN105472671B (zh) 2019-04-09

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