WO2011020373A1 - 基于gsm系统的小区切换方法、装置和系统 - Google Patents

基于gsm系统的小区切换方法、装置和系统 Download PDF

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Publication number
WO2011020373A1
WO2011020373A1 PCT/CN2010/074338 CN2010074338W WO2011020373A1 WO 2011020373 A1 WO2011020373 A1 WO 2011020373A1 CN 2010074338 W CN2010074338 W CN 2010074338W WO 2011020373 A1 WO2011020373 A1 WO 2011020373A1
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WIPO (PCT)
Prior art keywords
handover
message
coding mode
voice coding
msc
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Application number
PCT/CN2010/074338
Other languages
English (en)
French (fr)
Inventor
王兴国
吕洪涛
华志斌
陈祥榴
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中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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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 RU2012110307/07A priority Critical patent/RU2527484C2/ru
Priority to EP10809506.8A priority patent/EP2469968B1/en
Priority to IN2335DEN2012 priority patent/IN2012DN02335A/en
Publication of WO2011020373A1 publication Critical patent/WO2011020373A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0079Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18Service support devices; Network management devices
    • H04W88/181Transcoding devices; Rate adaptation devices

Definitions

  • the present invention relates to the field of communications, and in particular to a cell handover method, apparatus, and system based on a GSM system.
  • GSM mobile communication the location of a mobile station held by a user is not fixed, and the base station on the network side is fixed, and the surrounding environment is thousands of times. As the user moves, the quality of the communication may tend to deterioration. An effective way to pull is to switch. The switching process ensures that the communication is working properly and can also be used to improve the quality of the communication.
  • 1 is a flow chart of successful handover in a GSM system-based cell handover method according to the related art. Specifically, the flowchart is a flowchart of a telephone service handover, which includes the following steps:
  • MS Mobile Station
  • MEAS REP Measurement message
  • BTS 1 sends a measurement result message (MEAS RES) to the BSC (Base Station Controller);
  • the BSC returns a channel activation message (CH ACT ) to the BTS 2;
  • BTS2 sends a channel activation response message (CH ACT ACK ) to the BSC;
  • the BSC sends a handover command message (HANDOVER COMMAND) to the BTS 1;
  • BTS 1 sends a handover command message (HANDOVER COMMAND) to the MS; 7) the MS sends a handover access message (HO ACCESS) to the BTS2;
  • BTS2 sends a handover detection message (HO DETECT) to the BSC;
  • BTS2 sends a physical context (PHY INFO) to the MS;
  • BTS2 sends a chaining indication (EST INFO) to the BSC; 11) The MS sends an Asynchronous Balance Mode message (SABM) to the BTS2;
  • SABM Asynchronous Balance Mode message
  • BTS2 sends an unnumbered response frame message (UA) to the MS;
  • the MS sends a handover complete message (HANDOVER COMPLETE) to the BTS2;
  • BTS2 sends a handover complete message (HANDOVER COMPLETE) to the BSC; 15) the BSC sends a handover execution message (HO PERF) to the MSC (Mobile Switching Center);
  • the MSC returns a handover execution response message (HO PERF ACK) to the BSC.
  • HO PERF ACK handover execution response message
  • the A port is used, and the TC (Transcoder) is in the MGW (Media Gateway).
  • the port A is the communication interface between the BSC and the MSC.
  • the MS sends a HANDOVER COMPLETE message to the BSC, indicating that the handover was successful. Since the different voice coding modes are selected before and after the handover, the BSC sends a HANDOVER PERFORMED message (labeled HO PERF in the figure) to the MSC after receiving the HANDOVER COMPLETE message, informing the MSC of the new voice coding mode and the selected channel type.
  • the MSC checks the voice coding mode to change, and notifies the MGW to update the voice coding mode.
  • 2 is a flow chart of handover failure in a GSM system-based cell handover method according to the related art, which includes the following steps:
  • the MS sends a measurement report message (MEAS REP) to the BTS 1;
  • BTS 1 sends a measurement result message (MEAS RES) to the BSC; 3) the BSC sends a channel activation message (CH ACT ) to the BTS2;
  • MEAS RES measurement result message
  • CH ACT channel activation message
  • BTS2 sends a channel activation response message (CH ACT ACK ) to the BSC;
  • the BSC sends a handover command message (HANDOVER COMMAND) to the BTS 1;
  • BTS 1 sends a handover command message (HANDOVER COMMAND) to the MS;
  • the MS sends a handover failure message (HANDOVER FAILURE) to the BTS 1;
  • BTS 1 sends a handover failure message (HANDOVER FAILURE) to the BSC
  • HANDOVER FAILURE the handover failure message
  • the BSC determines that the handover needs to be initiated according to the measurement report. If the handover type is within the BSC handover, the HANDOVER COMMAND message is sent to the MS. The MS receives the handover command message and attempts to switch to the new channel. The secondary handover has not been successfully switched (here the BSC may have received the HANDOVER DETECT message); the MS sends a handover failure message on the channel before the handover, and returns the channel before the handover to continue the call.
  • HANDOVER FAILURE the handover failure message
  • the protocol 3GPP TS 48.008 V8.7.0
  • the protocol also specifies: If the BSC (Base Station Controller) detects that the mobile phone needs to initiate BSS (Base Station Systems, base station) System) Internal switching, but the mobile phone cannot obtain the same voice coding mode or the voice coding mode must be changed in the target cell.
  • the BSC needs to construct an INTERNAL HANDOVER REQUIRED message and use the existing BSSAP SCCP connection to The message is sent to the MSC, where the INTERNAL HANDOVER REQUIRED message carries the resource of the current handover BSS request.
  • the MSC receives an INTERNAL HANDOVER REQUIRED message to determine if the requested resource is available.
  • the MSC If the requested resource is not available, the MSC returns an INTERNAL HANDOVER REQUIRED REJECT message to the BSS, the BSC receives the INTERNAL HANDOVER REQUIRED REJECT message, and the handover ends; if the requested resource is available, the MSC sends the message to the BSS.
  • the INTERNAL HANDOVER COMMAND message wherein the INTERNAL HANDOVER COMMAND message carries valid information for subsequent switching, and the specific processing flow is as shown in FIG. 3, including the following steps:
  • the MS sends a measurement report message (MEAS REP) to the BTS 1;
  • BTS 1 sends a measurement result message (MEAS RES) to the BSC;
  • the BSC sends an internal handover request message (INTERNAL HANDOVER REQUIRED) to the MSC; 4) The MSC returns an internal handover command to the BSC (INTERNAL HANDOVER)
  • the BSC sends a channel activation message (CH ACT ) to the BTS 2;
  • BTS2 sends a channel activation confirmation message (CH ACT ACK ) to the BSC;
  • the BSC sends a handover command message (HANDOVER COMMAND) to the BTS 1; 8) BTS 1 sends a handover command message (HANDOVER COMMAND) to the MS;
  • the MS sends a handover access message (HO ACCESS) to the BTS2;
  • BTS2 sends a handover detection message (HO DETECT) to the BSC;
  • BTS2 sends a physical context (PHY INFO) to the MS; 12) the MS sends an Asynchronous Balance Mode message (SABM) to the BTS2;
  • PHY INFO physical context
  • SABM Asynchronous Balance Mode message
  • BTS2 sends a chaining indication (EST INFO) to the BSC;
  • BTS2 sends an unnumbered response frame message (UA) to the MS;
  • the MS sends a handover complete message (HANDOVER COMPLETE) to the BTS2;
  • BTS2 sends a handover complete message (HANDOVER COMPLETE) to the BSC; 17) The BSC sends a handover execution message (HO PERF) to the MSC.
  • HANDOVER COMPLETE handover complete message
  • HO PERF handover execution message
  • the BSC after receiving the HANDOVER COMPLETE message from the mobile terminal MS, the BSC sends a HANDOVER PERFORMED message to the MSC, informing the MSC of the new voice coding mode and the selected channel type, and the MSC checks the voice coding. The mode changes, and the current speech coding mode is updated to the switched speech coding mode.
  • the MSC updates the current voice coding mode used locally to the voice coding mode after handover; if the voice coding mode is used on the MGW, the MSC sends a message to notify the MGW to the current The speech coding mode is updated to the switched speech coding mode.
  • the first signaling received by the BSC after the mobile terminal MS accesses the new cell is the HANDOVER DETECT message sent by the BTS (in the figure, the standard is HO DETECT ), after about 200ms, receives the HANDOVER COMPLETE message (labeled HO COMPLETE in the drawing), and then sends a HANDOVER PERFORMED message to the MSC (labeled HO PERF in the figure)ong
  • the access to the new cell is separated from the MSC or the MGW by the voice coding mode.
  • the main object of the present invention is to provide a cell handover method, apparatus, and system based on the GSM system, to solve the above problem. At least one of the problems.
  • a cell handover method based on a GSM system including: after a base station controller BSC receives a handover detection message, the BSC determines whether a voice coding mode before and after handover changes. If the voice coding mode is changed, the BSC sends a first message to the mobile switching center MSC, so that the MSC updates the current voice coding mode to the switched voice coding mode, where the first message includes the switched channel type and voice. Coding mode; If the handover is successful, the BSC receives a handover complete message from the mobile terminal MS.
  • a BSC comprising: a receiving module, configured to receive a handover detection message from a BTS and a handover complete message from an MS; and a determining module, configured to determine after receiving the handover detection message Whether the voice coding mode before the handover and the voice coding mode after the handover are the same; the sending module is configured to: after the receiving module receives the handover detection message and before receiving the handover completion message, and after the determining module determines the voice coding mode after the handover Different from the voice coding mode before the handover, the first message is sent to the MSC, where the first message includes the channel type after the handover and the voice coding mode.
  • an MSC including: a receiving module, configured to receive a first message from a BSC, where the first message includes a channel type and a voice coding mode after switching; and an update module, After the receiving module receives the first message, the current voice coding mode is updated to the switched voice coding mode, or after the receiving module receives the first message, and sends a message to notify the MGW to update the current voice coding mode to be switched.
  • Voice coding method a cell handover system based on a GSM system is provided, which includes a BSC and an MSC.
  • the foregoing BSC includes: a first receiving module, configured to receive a handover detection message from the BTS and a handover complete message from the MS; and a determining module, configured to determine a voice coding mode before the handover after receiving the handover detection message Whether the voice coding method after switching is the same; sending The module sends a first message to the MSC after receiving the handover detection message and before receiving the handover completion message, and after the determining module determines that the voice coding mode after the handover is different from the voice coding mode before the handover,
  • the first message includes a channel type after switching and a voice coding mode.
  • the foregoing MSC includes: a second receiving module, configured to receive a first message from the BSC; and an update module, configured to update the current voice coding mode to a switched voice coding mode after the second receiving module receives the first message Or, after the second receiving module receives the first message, the message is sent to notify the MGW to update the current voice coding mode to the switched voice coding mode.
  • the BSC sends a message to the MSC before the HANDOVER COMPLETE message, informing the MSC of the switched speech coding mode and the selected channel type, so that the MSC updates the current speech coding mode to the switched speech coding mode. , thereby reducing the time of voice interruption during the handover process, and improving the user's body-risk.
  • FIG. 1 is a flowchart of handover success in a GSM system-based cell handover method according to the related art
  • FIG. 2 is a flowchart of handover failure in a GSM system-based cell handover method according to the related art
  • FIG. 1 is a flowchart of handover success in a GSM system-based cell handover method according to the related art
  • FIG. 2 is a flowchart of handover failure in a GSM system-based cell handover method according to the related art
  • FIG. 1 is a flowchart of handover success in a GSM system-based cell handover method according to the related art
  • FIG. 2 is a flowchart of handover failure in a GSM system-based cell handover method according to the related art
  • FIG. 4 is a flowchart of a GSM system-based cell handover method according to the present invention
  • FIG. 5 is a handover in a GSM system-based cell handover method according to an embodiment of the present invention
  • Figure 6 is a flow chart of a handover failure in a cell handover method based on the GSM system according to an embodiment of the present invention
  • Figure 7 is a structural diagram of a BSC according to an embodiment of the present invention
  • Figure 8 is a structural diagram of an MSC according to an embodiment of the present invention
  • Figure 9 is a structural diagram of a cell switching system based on the GSM system according to the present invention.
  • the present invention provides a cell handover method, apparatus and system based on the GSM system.
  • the BSC sends a message to the MSC before the HANDOVER COMPLETE message, and informs the MSC of the switched speech coding mode and the selected channel type, so that the MSC updates the current speech coding mode to the switched state.
  • the voice coding method reduces the time of voice interruption during the handover process and improves the user's body-risk.
  • a cell handover method based on a GSM system is provided.
  • 4 is a flow chart of a GSM system based cell handover method in accordance with the present invention.
  • the method includes the following steps: step S402 to step 4: S402: Step S402, the BSC receives a handover detection message from the BTS. After the MS accesses the new cell, the first signaling received by the BSC is the HANDOVER DETECT message sent by the BTS. Step S404, the BSC determines whether the speech coding mode before and after the handover changes.
  • Step S406 The BSC sends a first message to the MSC, where the first message includes a channel type after switching and a voice coding mode.
  • the first message can be an INTRABSC HANDOVER DETECT message, which carries CHOSEN channel (channel type used after switching) and Speech Version (voice encoding method used after switching;).
  • Step S408 After receiving the first message from the BSC, the MSC updates the current voice coding mode to the switched voice coding mode.
  • the MSC updates the current voice coding mode to the voice coding mode after the handover includes the following two situations: 1) If the voice coding mode is used on the MSC, the MSC updates the current voice coding mode used locally to the switched mode. Voice coding mode; 2) If the voice coding mode is used on the MGW, the MSC sends a message to notify MGW ⁇ ! The current speech coding mode is updated to the switched speech coding mode. Step S410, the BSC receives a handover complete message from the MS.
  • the BSC Upon completion of the handover, the BSC receives a handover complete message from the MS (this handover complete message can be initiated by the MS and forwarded to the BSC via the BTS) and sends a HANDOVER PERFORMED message to the MSC for the port MSC handover to be completed.
  • the content carried by the HANDOVER PERFORMED message can refer to the protocol content, as shown in Table 1.
  • the MSC then returns a HANDOVER PERFORMED ACK message (labeled HO PERF ACK in the figure) to let the BSC know that the MSC has updated the current speech coding mode to the switched speech coding mode as required by the BSC.
  • the BSC receives the handover failure message from the MS, and sends an INTRABSC HANDOVER FAIL message to the MSC, where the INTRABSC HANDOVER FAIL message carries the channel type and voice coding mode before the handover.
  • the MSC updates the current voice coding mode to the voice coding mode before the handover.
  • the MSC updates the current voice coding mode to the voice coding mode before the handover includes the following two situations: 1) If the voice coding mode is used on the MSC, the MSC updates the current voice coding mode used locally to before the handover.
  • FIG. 5 is a flowchart of a handover success in a GSM system-based cell handover method according to an embodiment of the present invention, which includes the following steps: 1) The MS sends a measurement 4 report message (MEAS REP) to the BTS 1;
  • BTS 1 sends a measurement result message (MEAS RES) to the BSC;
  • the BSC sends a channel activation message (CH ACT ) to the BTS 2;
  • BTS2 sends a channel activation response message (CH ACT ACK ) to the BSC;
  • the BSC sends a handover command message (HANDOVER COMMAND) to the BTS l; 6) the BTS l sends a handover command message (HANDOVER COMMAND) to the MS;
  • the MS sends a handover access message (HO ACCESS) to the BTS2;
  • BTS2 sends a handover detection message (HO DETECT) to the BSC;
  • BTS2 sends a physical context (PHY INFO) to the MS;
  • the BSC sends an internal handover detection (INSTRABSC HANDOVER DETECT) to the MSC;
  • the MS sends an Asynchronous Balance Mode message (SABM) to the BTS2;
  • SABM Asynchronous Balance Mode message
  • BTS2 sends a link establishment indication message (EST INFO) to the BSC;
  • BTS2 sends an unnumbered response frame message (UA) to the MS; 14) The MS sends a handover complete message (HANDOVER COMPLETE) to the BTS2;
  • BTS2 sends a handover complete message (HANDOVER COMPLETE) to the BSC;
  • the BSC sends a handover execution message (HO PERF) to the MSC;
  • Step S502 After receiving the HANDOVER DETECT message sent by the Abis interface, the BSC system communicates between the BSC and the BTS. Interface;), is handled by the CS control plane processing module.
  • the CS (Circuit Switch) control plane determines whether the voice coding modes before and after the handover are the same.
  • Step S504 The MSC receives the INTRABSC HANDOVER DETECT message sent through the A port, and updates the currently used voice coding mode to the switched voice coding mode.
  • the MSC renews the current speech coding mode to the switched speech coding mode, which includes the following two situations: 1) If the speech coding mode is used on the MSC, the MSC updates the current local speech coding mode to be switched.
  • the speech coding mode If the speech coding mode is used on the MGW, the MSC sends a message informing the MGW to update the current speech coding mode to the switched speech coding mode. After the update, the MSC or the MGW receives the uplink voice data according to the switched voice coding mode, and delivers the downlink voice data.
  • the BSC receives the HANDOVER COMPLETE message
  • Step S506 receiving a HANDOVER sent on the Abis port on the CS control plane of the BSC.
  • the BSC After the COMPLETE message, the BSC sends a HANDOVER PERFORMED message to the MSC to inform the MSC that the handover is complete.
  • the content carried by the HANDOVER PERFORMED message can be in accordance with the protocol content, as shown in Table 1.
  • the MSC may delete the information indicating the voice coding mode before the handover.
  • MSC delete The information for indicating the voice coding mode before the handover may include the following two situations: 1) if the voice coding mode is used on the MSC, the MSC deletes the information locally used to indicate the voice coding mode before the handover; 2) When the voice coding mode is used on the MGW, the MSC sends a message to the MGW to delete the information indicating the voice coding mode before the handover. Then, the MSC returns a HANDOVER PERFORMED ACK message, so that the BSC knows that the MSC or the MGW has updated the current voice coding mode to the switched voice coding mode according to the requirements of the BSC. Table 1
  • FIG. 6 is a flowchart of a handover failure in a cell handover method based on a GSM system according to an embodiment of the present invention, which includes the following steps:
  • the MS sends a measurement report message (MEAS REP) to the BTS 1;
  • BTS 1 sends a measurement result message (MEAS RES) to the BSC; 3) the BSC sends a channel activation message (CH ACT ) to the BTS2;
  • MEAS RES measurement result message
  • CH ACT channel activation message
  • BTS2 sends a channel activation response message (CH ACT ACK ) to the BSC;
  • the BSC sends a handover command message (HANDOVER COMMAND) to the BTS 1; 6) BTS 1 sends a handover command message (HANDOVER COMMAND) to the MS;
  • the MS sends a handover access message (HO ACCESS) to the BTS2;
  • BTS2 sends a handover detection message (HO DETECT) to the BSC;
  • the MS sends a handover failure message (HANDOVER FAILURE) to the BTS 1;
  • BTS 1 sends a handover failure message (HANDOVER FAILURE) to the BSC;
  • the BSC sends a BSC internal handover failure message (INTRABSC HANDOVER FAIL) to the MSC;
  • the MSC sends a BSC internal handover failure response message (INTRABSC HANDOVER FAIL ACK) to the BSC.
  • a BSC internal handover failure response message (INTRABSC HANDOVER FAIL ACK)
  • the specific processing procedure includes the following steps: Step S602, BSC system) to the Abis port
  • the CS control plane processing module After the HANDOVER DETECT message is sent, it is processed by the CS control plane processing module.
  • the CS control plane determines whether the speech coding modes before and after the handover are the same.
  • the INTRABSC HANDOVER DETECT message is formed, wherein, as shown in Table 2, the INTRABSC HANDOVER The DETECT message carries the channel type used after CHOSEN channeK switching) and the Speech Version (the speech coding method used after handover;), and then the BSC sends this message to the MSC.
  • Step S604 MSC updates the current speech coding mode to the switched speech coding mode to the INTRABSC HANDOVER DETECT message sent through the A port.
  • the MSC updates the current voice coding mode to the voice coding mode after the handover includes the following two situations: 1) If the voice coding mode is used on the MSC, the MSC updates the current voice coding mode used locally to The voice coding mode after switching; 2) If the voice coding mode is used on the MGW, the MSC sends a message to notify MGW ⁇ ! Capture the current voice coding update It is the voice coding method after switching. After the update, the MSC or the MGW receives the uplink voice data according to the switched voice coding mode, and delivers the downlink voice data.
  • Step S606 When the handover fails within the current BSS and returns to the original channel, the MS sends a HANDOVER FAILURE message to the BTS 1. Then, the CS control plane of the BSC receives the HANDOVER FAILURE message sent by the Abis port, and sends an INTRABSC HANDOVER FAIL message to the MSC. As shown in Table 3, the INTRABSC HANDOVER FAIL message carries the channel type and voice coding mode before handover. After receiving the INTRABSC HANDOVER FAIL, the MSC updates the current speech coding mode to the speech coding mode before the handover.
  • the MSC updates the current voice coding mode to the voice coding mode before the handover includes the following two situations: 1) If the voice coding mode is used on the MSC, the MSC updates the current voice coding mode used locally to before the handover. The speech coding mode; 2) If the speech coding mode is used on the MGW, the MSC sends a message informing the MGW to update the current speech coding mode to the speech coding mode before the handover. After the update, the MSC or the MGW receives the uplink voice data according to the voice coding mode before the handover, and delivers the downlink voice data. After successfully updating the voice coding mode, the MSC sends INTRABSC to the BSC.
  • the BSC sends a message to the MSC before receiving the HANDOVER COMPLETE message, informing the MSC of the switched speech coding mode and the selected channel type, so that the MSC can use the current use in advance.
  • the voice coding mode is updated to the voice coding mode after the handover, thereby reducing the time of voice interruption during the handover process and improving the user experience.
  • Apparatus Embodiment According to an embodiment of the present invention, a BSC is provided.
  • Fig. 7 is a structural diagram of a BSC according to an embodiment of the present invention.
  • the BSC can The receiving module 702 is configured to receive a handover detection message from the BTS and a handover complete message from the MS, where the handover complete message may be initiated by the MS and forwarded to the BSC through the BTS; the determining module 704 is connected to the receiving module 702. For determining whether the voice coding mode before the handover and the voice coding mode after the handover are the same after receiving the handover detection message; the sending module 706 is connected to the determination module 704, and configured to receive and receive the handover detection message after the receiving module 702 receives the handover detection message.
  • the first message is sent to the MSC, where the first message includes the channel type after the handover.
  • Voice coding method The receiving module 702 is further configured to receive a handover failure message from the MS, where the handover failure message may be initiated by the MS and forwarded to the BSC through the BTS.
  • the sending module 704 is further configured to: after the receiving module receives the handover failure message, send a second message to the MSC, where the second message includes a channel type and a voice coding mode before the handover.
  • an MSC is also provided. FIG.
  • the MSC may include: a receiving module 802, configured to receive a first message from a BSC, where the first message includes a channel type and a voice coding mode after switching; and an update module 804, connected to the receiving module 802. For updating the current voice coding mode to the switched voice coding mode after the receiving module 802 receives the first message, or sending a message to notify the MGW to update the current voice coding mode to the switched voice coding mode receiving module.
  • the 802 is further configured to receive a second message from the BSC, where the second message includes a channel type and a voice coding mode before the handover.
  • the update module 804 is further configured to update the current voice coding mode to the voice coding mode before the handover after the receiving module 802 receives the second message, or send a message to notify the MGW after the receiving module 802 receives the second message.
  • the current speech coding mode is updated to the speech coding mode before the handover.
  • the HANDOVER COMPLETE message sends a message to the MSC to inform the MSC of the switched voice coding mode and the selected channel type, so that the MSC can update the current voice coding mode to the switched voice coding mode in advance, thereby reducing the voice interruption during the handover process. Time has improved the user's physical insurance.
  • a cell switching system based on a GSM system is also provided.
  • Figure 9 is a structural diagram of a GSM system based cell handover system in accordance with the present invention. As shown in FIG.
  • the system includes a BSC 900 and an MSC 910, where the BSC 900 includes: a first receiving module 902, configured to receive a handover detection message from the BTS and a handover complete message from the BTS; and a determination module 904, connected to the a receiving module 902, configured to determine, after receiving the handover detection message, whether the voice coding mode before the handover and the voice coding mode after the handover are the same; the sending module 906 is connected to the determination module 904, after the receiving module receives the handover detection message Before receiving the handover complete message, and after the determining module 904 determines that the voice coding mode after the handover is different from the voice coding mode before the handover, the first message is sent to the MSC 910, where the first message includes the switched message.
  • the BSC 900 includes: a first receiving module 902, configured to receive a handover detection message from the BTS and a handover complete message from the BTS; and a determination module 904, connected to the a receiving module 902, configured to determine
  • the MSC 910 includes: a second receiving module 912, configured to receive a first message from the BSC 900; and an update module 914 connected to the second receiving module 912, configured to: after the second receiving module 912 receives the first message, the current The speech coding mode is updated to the switched speech coding mode, or the MGW is notified to update the current speech coding mode to the switched speech coding mode.
  • the BSC sends a message to the MSC before receiving the HANDOVER COMPLETE message, and informs the MSC of the switched voice coding mode and the selected channel type, so that the MSC can use the current use in advance.
  • the speech coding mode is updated to the switched speech coding mode, thereby reducing the time of the speech interruption during the handover process and improving the user body-risk.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modification, equivalent substitution, improvement, etc. made within the "God and Principles" of the present invention shall be included in the protection of the present invention. Within the scope.

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  • Mobile Radio Communication Systems (AREA)

Abstract

本发明提供了一种基于GSM系统的小区切换方法、装置和系统,其中,该基于GSM系统的小区切换方法包括: 在基站控制器BSC接收到切换检测消息之后,BSC判断切换前后的语音编码方式是否发生改变; 如果语音编码方式发生改变,则BSC向移动交换中心MSC发送第一消息,以便MSC将当前的语音编码方式更新为切换后的语音编码方式,其中,第一消息包括切换后的信道类型和语音编码方式; 如果切换成功, 则BSC接收到来自移动终端MS的切换完成消息。本发明解决了现有技术中的小区切换方法造成语音中断时间较长的问题,从而减少了切换过程中语音中断的时间,改善了用户体验。

Description

基于 GSM系统的小区切换方法、 装置和系统 技术领域 本发明涉及通信领域, 具体而言, 涉及一种基于 GSM 系统的小区切换 方法、 装置和系统。 背景技术 在 GSM移动通讯中, 用户手持的移动台位置是不固定的, 而网络侧的 基站则固定不动, 再加上周围环境的千 4尤, 随着用户的移动, 通讯的质量可 能趋向恶化。 一种有效的挽 ¾措施就是切换。 切换流程保证了通讯的正常进 行, 还可以用于提高通讯的质量。 图 1是根据相关技术的基于 GSM系统的小区切换方法中切换成功的流 程图, 具体地, 该流程图为电话业务切换的流程图, 其包括如下步骤:
1 )MS ( Mobile Station,移动终端)向 BTS 1 (其中, BTS , Base Transceiver Station, 基站收发信台) 发送测量 4艮告消息 ( MEAS REP );
2 ) BTS 1向 BSC ( Base Station Controller, 基站控制器)发送测量结果 消息 (MEAS RES );
3 ) BSC向 BTS2返回信道激活消息 ( CH ACT );
4 ) BTS2向 BSC发送信道激活应答消息 ( CH ACT ACK );
5 ) BSC向 BTS 1发送切换命令消息 ( HANDOVER COMMAND );
6 ) BTS 1向 MS发送切换命令消息 ( HANDOVER COMMAND ); 7 ) MS向 BTS2发送切换接入消息 ( HO ACCESS );
8 ) BTS2向 BSC发送切换检测消息 ( HO DETECT );
9 ) BTS2向 MS发送物理上下文 ( PHY INFO );
10 ) BTS2向 BSC发送建链指示 ( EST INFO ); 11 ) MS向 BTS2发送设置异步平衡模式消息 ( SABM );
12 ) BTS2向 MS发送无编号响应帧消息 ( UA );
13 ) MS向 BTS2发送切换完成消息 ( HANDOVER COMPLETE );
14 ) BTS2向 BSC发送切换完成消息 ( HANDOVER COMPLETE ); 15 ) BSC向 MSC ( Mobile Switching Center, 移动交换中心)发送切换 执行消息 (HO PERF );
16 ) MSC向 BSC返回切换执行应答消息 ( HO PERF ACK )。 在该 GSM系统中, A口釆用 载, TC ( Transcoder, 语音编解码器) 在 MGW ( Media Gateway, 媒体网关), 其中, A口为 BSC与 MSC之间的 通信接口。 如图 1所示, MS向 BSC发送 HANDOVER COMPLETE (切换 完成) 消息, 表示本次切换成功。 由于切换前后选择不同的语音编码方式, 所以 BSC 在收到 HANDOVER COMPLETE 消息之后, 向 MSC 发送 HANDOVER PERFORMED消息 (在附图中标记为 HO PERF ), 告知 MSC 新的语音编码方式和选择的信道类型, MSC检查语音编码方式发生变化, 通 知 MGW更新语音编码方式。 图 2是根据相关技术的基于 GSM系统的小区切换方法中切换失败的流 程图, 其包括如下步骤:
1 ) MS向 BTS 1发送测量报告消息 ( MEAS REP );
2 ) BTS 1向 BSC发送测量结果消息 ( MEAS RES ); 3 ) BSC向 BTS2发送信道激活消息 ( CH ACT );
4 ) BTS2向 BSC发送信道激活应答消息 ( CH ACT ACK );
5 ) BSC向 BTS 1发送切换命令消息 ( HANDOVER COMMAND );
6 ) BTS 1向 MS发送切换命令消息 ( HANDOVER COMMAND );
7 ) MS向 BTS 1发送切换失败消息 ( HANDOVER FAILURE );
8 ) BTS 1向 BSC发送切换失败消息 ( HANDOVER FAILURE )„ 如图 2 所示, BSC 根据测量报告判断需要发起切换, 判断切换类型是 BSC内切换, 则向 MS发送 HANDOVER COMMAND (切换命令) 消息, MS 收到切换命令消息, 尝试向新信道切换, 但本次切换没有切换成功 (此 处 BSC可能已经收到 HANDOVER DETECT (切换检测 ) 消息;), MS则在 切换前的信道上发切换失败消息, 返回切换前的信道继续进行通话。 此外,在 A口釆用 IP 载的 GSM系统中,协议( 3GPP TS 48.008 V8.7.0 ) 还规定: 如果 BSC ( Base Station Controller, 基站控制器)检测到手机需要 发起 BSS ( Base Station Systems, 基站子系统) 内部切换, 但是手机在目标 小区不能获得相同的语音编码方式或者语音编码方式必须改变,这时 BSC需 要构建一个 INTERNAL HANDOVER REQUIRED (内部切换请求)消息, 并 通过已经存在的 BSSAP SCCP 连接将该消息发送给 MSC , 其中, 该 INTERNAL HANDOVER REQUIRED消息携带本次切换 BSS请求的资源。 MSC收到 INTERNAL HANDOVER REQUIRED消息, 判断请求的资源是否 可用。 如果请求的资源不可用, 则 MSC 向 BSS 返回一个 INTERNAL HANDOVER REQUIRED REJECT (内部切换请求拒绝) 消息, BSC 收到 INTERNAL HANDOVER REQUIRED REJECT消息, 本次切换结束; 如果请 求的资源可用, 则 MSC向 BSS发送 INTERNAL HANDOVER COMMAND (内部切换命令 ) 消息, 其中, 该 INTERNAL HANDOVER COMMAND消 息中携带有效的信息, 以便于后面的切换, 其具体的处理流程如图 3所示, 包括如下步 4聚:
1 ) MS向 BTS 1发送测量报告消息 ( MEAS REP );
2 ) BTS 1向 BSC发送测量结果消息 ( MEAS RES );
3 ) BSC 向 MSC 发送内部切换请求消息 (INTERNAL HANDOVER REQUIRED ); 4 ) MSC 向 BSC 返回内部切换命令 ( INTERNAL HANDOVER
COMMAND );
5 ) BSC向 BTS2发送信道激活消息 ( CH ACT );
6 ) BTS2向 BSC发送信道激活确认消息 ( CH ACT ACK );
7 ) BSC向 BTS 1发送切换命令消息 ( HANDOVER COMMAND ); 8 ) BTS 1向 MS发送切换命令消息 ( HANDOVER COMMAND );
9 ) MS向 BTS2发送切换接入消息 ( HO ACCESS );
10 ) BTS2向 BSC发送切换检测消息 ( HO DETECT );
11 ) BTS2向 MS发送物理上下文 ( PHY INFO ); 12 ) MS向 BTS2发送设置异步平衡模式消息 ( SABM );
13 ) BTS2向 BSC发送建链指示 ( EST INFO );
14 ) BTS2向 MS发送无编号响应帧消息 ( UA );
15 ) MS向 BTS2发送切换完成消息 ( HANDOVER COMPLETE );
16 ) BTS2向 BSC发送切换完成消息 ( HANDOVER COMPLETE ); 17 ) BSC向 MSC发送切换执行消息 ( HO PERF )。 同样, 在图 3 所示的切换方法中, BSC 在收到来自手机终端 MS 的 HANDOVER COMPLETE 消 息之后 , 向 MSC 发送 HANDOVER PERFORMED消息, 告知 MSC新的语音编码方式和选择的信道类型, MSC 检查语音编码方式发生变化, 将当前的语音编码方式更新为切换后的语音编 码方式。 这里, 如果语音编码方式在 MSC上被使用, 则 MSC将本地使用的 当前语音编码方式更新为切换后的语音编码方式; 如果语音编码方式在 MGW上被使用, 则 MSC发消息通知 MGW将当前的语音编码方式更新为 切换后的语音编码方式。 但是, 对于上述的两种处理流程而言, 在切换时, BSC在手机终端 MS 接入新小区后收到的第一条信令是 BTS发上来的 HANDOVER DETECT消 息(在附图中标 ΐ己为 HO DETECT ),经过大约 200ms之后才收到 HANDOVER COMPLETE消息 (在附图中标记为 HO COMPLETE ), 然后, 再向 MSC发 送 HANDOVER PERFORMED消息(在附图中标记为 HO PERF )„ 此时, 由 于 MS接入新小区与 MSC或 MGW更新语音编码方式之间相隔了一段时间, 如果切换前后语音编码方式不一致, 则在这段时间上会导致 MSC或 MGW 上丢弃上行数据, BSC上丢弃下行数据, 使得语音中断时间较长, 降低用户 体验。 针对相关技术中的小区切换方法会造成语音中断时间较长的问题, 目前 尚未提出有效的解决方案。 发明内容 针对相关技术中的小区切换方法造成语音中断时间较长的问题而提出本 发明, 为此, 本发明的主要目的在于提供一种基于 GSM 系统的小区切换方 法、 装置和系统, 以解决上述问题至少之一。 为了实现上述目的, 才艮据本发明的一个方面, 提供了基于 GSM 系统的 小区切换方法, 其包括: 在基站控制器 BSC接收到切换检测消息之后, BSC 判断切换前后的语音编码方式是否发生改变; 如果语音编码方式发生改变, 则 BSC向移动交换中心 MSC发送第一消息, 以便 MSC将当前的语音编码 方式更新为切换后的语音编码方式, 其中, 第一消息包括切换后的信道类型 和语音编码方式; 如果切换成功, 则 BSC接收到来自移动终端 MS的切换完 成消息。 根据本发明的另一方面, 提供了一种 BSC, 其包括: 接收模块, 用于接 收来自 BTS的切换检测消息和来自 MS的切换完成消息; 判断模块, 用于在 接收到切换检测消息之后判断切换前的语音编码方式和切换后的语音编码方 式是否相同; 发送模块, 用于在接收模块接收到切换检测消息之后与接收到 切换完成消息之前, 并在判断模块判断出切换后的语音编码方式不同于切换 前的语音编码方式的情况下, 向 MSC发送第一消息, 其中, 第一消息包括 切换后的信道类型和语音编码方式。 根据本发明的又一方面, 提供了一种 MSC, 其包括: 接收模块, 用于接 收来自 BSC的第一消息, 其中, 第一消息包括切换后的信道类型和语音编码 方式; 更新模块, 用于在接收模块接收到第一消息之后将当前的语音编码方 式更新为切换后的语音编码方式, 或者, 在接收模块接收到第一消息之后发 消息通知 MGW 夺当前的语音编码方式更新为切换后的语音编码方式。 根据本发明的又一方面, 提供了一种基于 GSM 系统的小区切换系统, 其包括 BSC和 MSC。 优选的, 上述的 BSC包括: 第一接收模块, 用于接收来自 BTS的切换 检测消息和来自 MS的切换完成消息; 判断模块, 用于在接收到切换检测消 息之后判断切换前的语音编码方式和切换后的语音编码方式是否相同; 发送 模块, 在接收模块接收到切换检测消息之后与接收到切换完成消息之前, 并 在判断模块判断出切换后的语音编码方式不同于切换前的语音编码方式的情 况下, 向 MSC发送第一消息, 其中, 第一消息包括切换后的信道类型和语 音编码方式。 上述的 MSC包括: 第二接收模块, 用于接收来自 BSC的第一消息; 更 新模块, 用于在第二接收模块接收到第一消息之后将当前的语音编码方式更 新为切换后的语音编码方式, 或者, 在第二接收模块接收到第一消息之后发 消息通知 MGW 夺当前的语音编码方式更新为切换后的语音编码方式。 才艮据本发明, BSC在接) 到 HANDOVER COMPLETE消息之前向 MSC 发送消息, 告知 MSC切换后的语音编码方式和选择的信道类型, 以便 MSC 将当前的语音编码方式更新为切换后的语音编码方式, 从而减少了切换过程 中语音中断的时间, 改善了用户体 -险。 附图说明 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的 不当限定。 在附图中: 图 1是根据相关技术的基于 GSM系统的小区切换方法中切换成功的流 程图; 图 2是根据相关技术的基于 GSM系统的小区切换方法中切换失败的流 程图; 图 3是根据相关技术的基于 GSM系统的小区切换方法的流程图; 图 4是根据本发明的基于 GSM系统的小区切换方法的流程图; 图 5根据本发明实施例的基于 GSM系统的小区切换方法中切换成功的 流程图; 图 6根据本发明实施例的基于 GSM系统的小区切换方法中切换失败的 流程图; 图 7是 居本发明实施例的 BSC的结构图; 图 8是 居本发明实施例的 MSC的结构图; 图 9是根据本发明的基于 GSM系统的小区切换系统的结构图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是, 在 不冲突的情况下, 本申请中的实施例及实施例中的特征可以相互组合。 考虑到相关技术中的小区切换方法造成语音中断时间较长的问题, 本发 明提供一种基于 GSM 系统的小区切换方法、 装置和系统。 在根据本发明的 小区切换方法中, BSC在接) 到 HANDOVER COMPLETE消息之前向 MSC 发送消息, 告知 MSC切换后的语音编码方式和选择的信道类型, 以便 MSC 将当前的语音编码方式更新为切换后的语音编码方式, 从而减少了切换过程 中语音中断的时间, 改善了用户体 -险。 方法实施例 根据本发明的实施例, 提供了一种基于 GSM系统的小区切换方法。 图 4是根据本发明的基于 GSM 系统的小区切换方法的流程图。 如图 4 所示, 该方法包括如下的步 4聚 S402至步 4聚 S410: 步骤 S402, BSC接收来自 BTS的切换检测消息。 在 MS 接入新小区后, BSC 收到的第一条信令是 BTS 发上来的 HANDOVER DETECT (切换检测 ) 消息。 步一骤 S404, BSC判断切换前后的语音编码方式是否发生改变, 如果发生 改变, 则转至步 4聚 S406; 如果没有发生改变, 则转至步 4聚 S410。 在接收到 BTS发上来的切换检测消息之后, BSC对切换前后的语音编码 方式进行判断, 如果切换前后的语音编码方式不同, 则随后会将切换后的语 音编码方式通知给 MSC。 步骤 S406 , BSC向 MSC发送第一消息, 其中, 第一消息包括切换后的 信道类型和语音编码方式。 第一消息可以为 INTRABSC HANDOVER DETECT 消息, 其携带有 CHOSEN channel (切换后使用的信道类型) 和 Speech Version (切换后使用 的语音编码方式;)。 如果是 AMR ( Adaptive Multi Rate, 自适应多码率;), 则 釆用先前 MSC指派消息里面指定的 ACS ( Active Codec Set, 活性编解码子 集)。 这样, BSC在接收到 HANDOVER COMPLETE (切换完成) 消息之前 向 MSC发送消息, 告知 MSC切换后的语音编码方式和选择的信道类型, 以 便 MSC提前^ 1当前的语音编码方式更新为切换后的语音编码方式, 从而减 少了切换过程中语音中断的时间, 改善了用户体验。 步骤 S408 , MSC接收到来自所述 BSC的第一消息之后, 将当前的语音 编码方式更新为切换后的语音编码方式。 这里, MSC将当前的语音编码方式更新为切换后的语音编码方式包括如 下两种情况: 1 ) 如果语音编码方式在 MSC上被使用, 则 MSC将本地使用 的当前语音编码方式更新为切换后的语音编码方式; 2 ) 如果语音编码方式 在 MGW上被使用, 则 MSC发消息通知 MGW ^!夺当前的语音编码方式更新 为切换后的语音编码方式。 步骤 S410, BSC接收来自 MS的切换完成消息。 在切换完成时, BSC接收到来自 MS的切换完成消息 (该切换完成消息 可以由 MS 发起, 并经 BTS 转发至 BSC ), 并向 MSC发送 HANDOVER PERFORMED消息,以便通 口 MSC切换已完成。 HANDOVER PERFORMED 消息携带的内容可以参照协议内容, 如表 1 所示。 然后, MSC 返回 HANDOVER PERFORMED ACK消息 (在附图中标记为 HO PERF ACK ), 以便让 BSC知道 MSC已经按照 BSC的要求将当前的语音编码方式更新为切 换后的语音编码方式。 如果本次 BSS内部切换失败返回原信道, BSC接收来自 MS的切换失败 消息, 并向 MSC发送 INTRABSC HANDOVER FAIL消息, 该 INTRABSC HANDOVER FAIL消息携带切换前的信道类型和语音编码方式。 MSC收到 INTRABSC HANDOVER FAIL消息后, 将当前的语音编码方式更新为切换 前的语音编码方式。 这里, MSC将当前的语音编码方式更新为切换前的语音 编码方式包括如下两种情况: 1 ) 如果语音编码方式在 MSC 上被使用, 则 MSC将本地使用的当前的语音编码方式更新为切换前的语音编码方式; 2 ) 如果语音编码方式在 MGW上被使用, 则 MSC发消息通知 MGW将当前的 语音编码方式更新为切换前的语音编码方式。 在成功更新语音编码方式之后, MSC 向 BSC 发送 INTRABSC HANDOVER FAIL ACK消息, 以便让 BSC知道 MSC已经将当前的语音编 码方式更新为切换前的语音编码方式。 下面将结合实例对本发明实施例的实现过程进行详细描述。 本发明提供的方案, 需要涉及到 BSC业务软件和核心网业务系统。 图 5根据本发明实施例的基于 GSM系统的小区切换方法中切换成功的 流程图, 其包括如下步骤: 1 ) MS向 BTS 1发送测量 4艮告消息 ( MEAS REP );
2 ) BTS 1向 BSC发送测量结果消息 ( MEAS RES );
3 ) BSC向 BTS2发送信道激活消息 ( CH ACT );
4 ) BTS2向 BSC发送信道激活应答消息 ( CH ACT ACK );
5 ) BSC向 BTS l发送切换命令消息 ( HANDOVER COMMAND ); 6 ) BTS l向 MS发送切换命令消息 ( HANDOVER COMMAND );
7 ) MS向 BTS2发送切换接入消息 ( HO ACCESS );
8 ) BTS2向 BSC发送切换检测消息 ( HO DETECT );
9 ) BTS2向 MS发送物理上下文 ( PHY INFO );
10 ) BSC 向 MSC 发送内部切换检测 ( INTRABSC HANDOVER DETECT );
11 ) MS向 BTS2发送设置异步平衡模式消息 ( SABM );
12 ) BTS2向 BSC发送建链指示消息 ( EST INFO );
13 ) BTS2向 MS发送无编号响应帧消息 ( UA ); 14 ) MS向 BTS2发送切换完成消息 ( HANDOVER COMPLETE );
15 ) BTS2向 BSC发送切换完成消息 ( HANDOVER COMPLETE );
16 ) BSC向 MSC发送切换执行消息 ( HO PERF );
17 ) MSC向 BSC返回切换执行应答消息 ( HO PERF ACK )。 如图 5所示, 对于 BSS内部切换成功的情况, 其具体处理流程包括以下 步骤: 步骤 S502, BSC系统接收到 Abis口上发的 HANDOVER DETECT消息 后 (其中, Abis口为 BSC与 BTS之间的通信接口;), 交由 CS控制面处理模 块处理。 CS ( Circuit Switch, 电路交换)控制面判断切换前后的语音编码方 式是否相同, 若不同, 则组建 INTRABSC HANDOVER DETECT消息(携带 CHOSEN channel (切换后使用的信道类型) 和 Speech Version (切换后使用 的语音编码方式)), 并将此消息发送给 MSC。 步骤 S504 , MSC 接收到通过 A 口发送的 INTRABSC HANDOVER DETECT消息, 将当前使用的语音编码方式更新为切换后的语音编码方式。 这里, MSC 夺当前的语音编码方式更新为切换后的语音编码方式包括如下两 种情况: 1 ) 如果语音编码方式在 MSC上被使用, 则 MSC将本地使用的当 前的语音编码方式更新为切换后的语音编码方式; 2 ) 如果语音编码方式在 MGW上被使用, 则 MSC发消息通知 MGW将当前的语音编码方式更新为 切换后的语音编码方式。 在更新之后, MSC或 MGW按照切换后的语音编码 方式接收上行语音数据, 下发下行语音数据。 这样, 在 BSC接收到 HANDOVER COMPLETE (切换完成)消息之前,
MSC或 MGW已经^ 1当前的语音编码方式更新为切换后的语音编码方式,并 按照切换后的语音编码方式接收上行语音数据, 下发下行语音数据, 从而减 少了切换过程中语音中断的时间, 改善了用户体验。 步骤 S506 , 在 BSC 的 CS 控制面收到 Abis 口上发的 HANDOVER
COMPLETE消息之后, BSC向 MSC发送 HANDOVER PERFORMED消息, 以便告知 MSC切换已完成。 HANDOVER PERFORMED消息携带的内容可 以按照协议内容, 如表 1所示。 在接收到 HANDOVER COMPLETE消息之 后, MSC可以删除用于指示切换前的语音编码方式的信息。 这里, MSC删 除用于指示切换前的语音编码方式的信息可以包括如下两种情况: 1 ) 如果 语音编码方式在 MSC上被使用, 则 MSC删除本地用于指示切换前的语音编 码方式的信息; 2 )如果语音编码方式在 MGW上被使用, 则 MSC发消息通 知 MGW删除用于指示切换前的语音编码方式的信息。 然后, MSC返回 HANDOVER PERFORMED ACK消息, 以便让 BSC 知道 MSC或 MGW已经按照 BSC的要求将当前的语音编码方式更新为切换 后的语音编码方式。 表 1
Figure imgf000013_0001
在表 1中, M为必选字段, O为可选字段。 REFERENCE列是该信息单 元的编码格式, 可以参见 3GPP协议的具体章节。 图 6根据本发明实施例的基于 GSM系统的小区切换方法中切换失败的 流程图, 其包括如下步骤:
1 ) MS向 BTS 1发送测量报告消息 ( MEAS REP );
2 ) BTS 1向 BSC发送测量结果消息 ( MEAS RES ); 3 ) BSC向 BTS2发送信道激活消息 ( CH ACT );
4 ) BTS2向 BSC发送信道激活应答消息 ( CH ACT ACK );
5 ) BSC向 BTS 1发送切换命令消息 ( HANDOVER COMMAND ); 6 ) BTS 1向 MS发送切换命令消息 ( HANDOVER COMMAND );
7 ) MS向 BTS2发送切换接入消息 ( HO ACCESS );
8 ) BTS2向 BSC发送切换检测消息 ( HO DETECT );
9 ) MS向 BTS 1发送切换失败消息 ( HANDOVER FAILURE );
10 ) BTS 1向 BSC发送切换失败消息 ( HANDOVER FAILURE );
11 )BSC向 MSC发送 BSC内部切换失败消息( INTRABSC HANDOVER FAIL );
12 ) MSC 向 BSC 发送 BSC 内部切换失败应答消息 (INTRABSC HANDOVER FAIL ACK )„ 如图 6所示, 对于 BSS内部切换失败的情况, 其具体处理流程包括以下 步骤: 步骤 S602, BSC系统) 到 Abis口上发的 HANDOVER DETECT消息后, 交由 CS控制面处理模块处理。 CS控制面判断切换前后的语音编码方式是否 相同, 若不同, 则组建 INTRABSC HANDOVER DETECT消息, 其中, 如表 2所示,该 INTRABSC HANDOVER DETECT消息携带 CHOSEN channeK切 换后使用的信道类型) 和 Speech Version (切换后使用的语音编码方式;), 然 后, BSC将此消息发送给 MSC。
表 2
Figure imgf000014_0001
步骤 S604 , MSC ) 到通过 A 口发送的 INTRABSC HANDOVER DETECT消息, 将当前的语音编码方式更新为切换后的语音编码方式。 如上 所述, MSC将当前的语音编码方式更新为切换后的语音编码方式包括如下 两种情况: 1 ) 如果语音编码方式在 MSC上被使用, 则 MSC将本地使用的 当前的语音编码方式更新为切换后的语音编码方式; 2 ) 如果语音编码方式 在 MGW上被使用, 则 MSC发消息通知 MGW ^!夺当前的语音编码方式更新 为切换后的语音编码方式。 在更新之后, MSC或 MGW按照切换后的语音编 码方式接收上行语音数据, 下发下行语音数据。 步骤 S606, 在本次 BSS内部切换失败并返回原信道时, MS向 BTS 1发 送 HANDOVER FAILURE消息。 然后, BSC的 CS控制面接收到 Abis口上 发的 HANDOVER FAILURE消息,并向 MSC发送 INTRABSC HANDOVER FAIL消息。 如表 3所示, 该 INTRABSC HANDOVER FAIL消息携带切换前 的信道类型和语音编码方式。 MSC在接收到 INTRABSC HANDOVER FAIL 后, 将当前的语音编码方式更新为切换前的语音编码方式。 这里, MSC将当 前的语音编码方式更新为切换前的语音编码方式包括如下两种情况: 1 ) 如 果语音编码方式在 MSC上被使用, 则 MSC将本地使用的当前的语音编码方 式更新为切换前的语音编码方式; 2 )如果语音编码方式在 MGW上被使用, 则 MSC发消息通知 MGW将当前的语音编码方式更新为切换前的语音编码 方式。 在更新之后, MSC或 MGW按照切换前的语音编码方式接收上行语音 数据, 下发下行语音数据。 在成功更新语音编码方式之后, MSC 向 BSC 发送 INTRABSC
HANDOVER FAIL ACK消息(无内容), 以便让 BSC知道 MSC或 MGW已 经按照 BSC的要求将当前的语音编码方式更新为切换前的语音编码方式。 表 3
Figure imgf000015_0001
由上可知,在才艮据本发明的小区切换方法中, BSC在接收到 HANDOVER COMPLETE消息之前向 MSC发送消息, 告知 MSC切换后的语音编码方式 和选择的信道类型, 以便 MSC提前将当前使用的语音编码方式更新为切换 后的语音编码方式, 从而减少了切换过程中语音中断的时间, 改善了用户体 验。 装置实施例 根据本发明的实施例, 提供了一种 BSC。 图 7是才艮据本发明实施例的 BSC的结构图。 如图 7所示, 该 BSC可以 包括: 接收模块 702 , 用于接收来自 BTS的切换检测消息和来自 MS的切换 完成消息, 这里, 切换完成消息可以由 MS发起, 并经过 BTS转发至 BSC; 判断模块 704 , 连接至接收模块 702 , 用于在接收到切换检测消息之后判断 切换前的语音编码方式和切换后的语音编码方式是否相同; 发送模块 706 , 连接至判断模块 704 , 用于在接收模块 702接收到切换检测消息之后与接收 到切换完成消息之前, 并在判断模块 704判断出切换后的语音编码方式不同 于切换前的语音编码方式的情况下, 向 MSC发送第一消息, 其中, 第一消 息包括切换后的信道类型和语音编码方式。 接收模块 702还用于收到来自 MS的切换失败消息, 这里, 切换失败消 息可以由 MS发起, 并经过 BTS转发至 BSC。 发送模块 704 , 还用于在接收 模块接收到切换失败消息之后, 向 MSC发送第二消息, 其中, 第二消息包 括切换前的信道类型和语音编码方式。 根据本发明的实施例, 还提供了一种 MSC。 图 8是才艮据本发明实施例的 MSC的结构图。 如图 8所示, 该 MSC可以 包括: 接收模块 802 , 用于接收来自 BSC的第一消息, 其中, 第一消息包括 切换后的信道类型和语音编码方式; 更新模块 804 , 连接至接收模块 802 , 用于在接收模块 802接收到第一消息之后将当前的语音编码方式更新为切换 后的语音编码方式, 或者, 发消息通知 MGW将当前的语音编码方式更新为 切换后的语音编码方式 接收模块 802还用于接收来自 BSC的第二消息, 其中, 第二消息包括切 换前的信道类型和语音编码方式。 相应的, 更新模块 804还用于在接收模块 802 接收到第二消息之后将当前的语音编码方式更新为切换前的语音编码方 式, 或者, 在接收模块 802接收到第二消息之后发消息通知 MGW将当前的 语音编码方式更新为切换前的语音编码方式。 由上可知, 根据上述实施例所描述的 BSC 和 MSC , BSC 在接收到
HANDOVER COMPLETE消息之前向 MSC发送消息, 告知 MSC切换后的 语音编码方式和选择的信道类型, 以便 MSC提前将当前的语音编码方式更 新为切换后的语音编码方式, 从而减少了切换过程中语音中断的时间, 改善 了用户体险。 根据本发明的实施例, 还提供了一种基于 GSM系统的小区切换系统。 图 9是根据本发明的基于 GSM 系统的小区切换系统的结构图。 如图 9 所示, 系统包括 BSC 900和 MSC 910 , 其中, BSC 900包括: 第一接收模块 902 , 用于接收来自 BTS的切换检测消息和来自 BTS的切换完成消息; 判断 模块 904 , 连接至第一接收模块 902 , 用于在接收到切换检测消息之后判断 切换前的语音编码方式和切换后的语音编码方式是否相同; 发送模块 906 , 连接至判断模块 904 , 在接收模块接收到切换检测消息之后与接收到切换完 成消息之前, 并在判断模块 904判断出切换后的语音编码方式不同于切换前 的语音编码方式的情况下, 向 MSC 910发送第一消息, 其中, 第一消息包括 切换后的信道类型和语音编码方式。 MSC 910包括: 第二接收模块 912 ,用于接收来自 BSC 900的第一消息; 更新模块 914 , 连接至第二接收模块 912 , 用于在第二接收模块 912接收到 第一消息之后将当前的语音编码方式更新为切换后的语音编码方式, 或者, 发消息通知 MGW将当前的语音编码方式更新为切换后的语音编码方式。 由上可知, 在上述实施例所描述的小区切换系统中, BSC 在接收到 HANDOVER COMPLETE消息之前向 MSC发送消息, 告知 MSC切换后的 语音编码方式和选择的信道类型, 以便 MSC提前将当前使用的语音编码方 式更新为切换后的语音编码方式, 从而减少了切换过程中语音中断的时间, 改善了用户体 -险。 需要说明的是, 在附图的流程图示出的步骤可以在诸如一组计算机可执 行指令的计算机系统中执行, 并且, 虽然在流程图中示出了逻辑顺序, 但是 在某些情况下, 可以以不同于此处的顺序执行所示出或描述的步骤。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布 在多个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程 序代码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 或 者将它们分别制作成各个集成电路模块, 或者将它们中的多个模块或步骤制 作成单个集成电路模块来实现。 这样, 本发明不限制于任何特定的硬件和软 件结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本 领域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的^"神和 原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护 范围之内。

Claims

权 利 要 求 书
1. 一种基于 GSM 系统的小区切换方法, 其特征在于, 在基站控制器 BSC 接收到切换检测消息之后, 所述方法还包括:
所述 BSC判断切换前后的语音编码方式是否发生改变; 如果语音编码方式发生改变, 则所述 BSC向移动交换中心 MSC发 送第一消息, 以便所述 MSC 将当前的语音编码方式更新为切换后的语 音编码方式, 其中, 所述第一消息包括切换后的信道类型和语音编码方 式;
如果切换成功, 则所述 BSC接收到来自移动终端 MS的切换完成消 息。
2. 根据权利要求 1 所述的方法, 其特征在于, 所述 MSC将当前的语音编 码方式更新为切换后的语音编码方式包括:
所述 MSC发消息通知媒体网关 MGW将所述当前的语音编码方式 更新为所述切换后的语音编码方式。
3. 根据权利要求 1所述的方法, 其特征在于, 在所述 BSC接收到来自 MS 的切换完成消息之后, 所述方法还包括:
所述 MSC接收来自所述 BSC的第二消息, 其中, 所述第二消息携 带有用于指示切换完成的信息;
所述 MSC删除用于指示切换前的语音编码方式的信息。
4. 根据权利要求 3所述的方法, 其特征在于, 所述 MSC删除用于指示切 换前的语音编码方式的信息包括:
所述 MSC发消息通知 MGW删除所述用于指示切换前的语音编码 方式的信息。
5. 根据权利要求 1所述的方法, 其特征在于, 在所述 BSC向 MSC发送第 一消息之后, 所述方法还包括:
如果 BSC接收到 MS发出的切换失败消息,则所述 BSC向所述 MSC 发送第三消息, 以便所述 MSC 将当前的语音编码方式更新为切换前的 语音编码方式, 其中, 所述第三消息包括切换前的信道类型和语音编码 方式。
6. 根据权利要求 5所述的方法, 其特征在于, 所述 MSC将当前的语音编 码方式更新为切换前的语音编码方式包括:
所述 MSC发消息通知 MGW将当前的语音编码方式更新为切换前 的语音编码方。
7. 根据权利要求 1至 6中任一项所述的方法, 其特征在于, 在所述 MS切 换到新小区之后, 基站收发信台 BTS向所述 BSC发送所述切换检测消 息。
8. —种基站控制器 BSC, 其特征在于, 包括:
接收模块, 用于接收来自基站收发信台 BTS的切换检测消息和来自 移动终端 MS的切换完成消息;
判断模块, 用于在接收到所述切换检测消息之后判断切换前的语音 编码方式和切换后的语音编码方式是否相同;
发送模块, 用于在所述接收模块接收到所述切换检测消息之后与接 收到所述切换完成消息之前, 并在所述判断模块判断出切换后的语音编 码方式不同于切换前的语音编码方式的情况下, 向 MSC发送第一消息, 其中, 所述第一消息包括切换后的信道类型和语音编码方式。
9. 根据权利要求 8所述的 BSC, 其特征在于, 包括:
所述接收模块, 还用于收到来自 MS的切换失败消息; 所述发送模块, 还用于在所述接收模块接收到所述切换失败消息之 后, 向所述 MSC 发送第二消息, 其中, 所述第二消息包括切换前的信 道类型和语音编码方式。
10. —种移动交换中心 MSC, 其特征在于, 包括:
接收模块, 用于接收来自所述 BSC的第一消息, 其中, 所述第一消 息包括切换后的信道类型和语音编码方式;
更新模块, 用于在所述接收模块接收到所述第一消息之后将当前的 语音编码方式更新为切换后的语音编码方式, 或者, 在所述接收模块接 收到所述第一消息之后发消息通知 MGW将所述当前的语音编码方式更 新为所述切换后的语音编码方式。
11. 一种基于 GSM 系统的小区切换系统, 其特征在于, 所述系统包括基站 控制器 BSC和移动交换中心 MSC, 其中,
所述 BSC包括:
第一接收模块, 用于接收来自 BTS的切换检测消息和来自 MS的切 换完成消息;
判断模块, 用于在接收到所述切换检测消息之后判断切换前的语音 编码方式和切换后的语音编码方式是否相同;
发送模块, 在所述接收模块接收到所述切换检测消息之后与接收到 所述切换完成消息之前, 并在所述判断模块判断出切换后的语音编码方 式不同于切换前的语音编码方式的情况下, 向所述 MSC发送第一消息 , 其中, 所述第一消息包括切换后的信道类型和语音编码方式;
所述 MSC包括:
第二接收模块, 用于接收来自所述 BSC的所述第一消息; 更新模块, 用于在所述第二接收模块接收到所述第一消息之后将当 前的语音编码方式更新为切换后的语音编码方式, 或者, 在所述第二接 收模块接收到所述第一消息之后发消息通知 MGW将当前的语音编码方 式更新为切换后的语音编码方式。
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IN2012DN02335A (zh) 2015-08-21
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