WO2013091579A1 - 移动台切换方法、设备和系统 - Google Patents

移动台切换方法、设备和系统 Download PDF

Info

Publication number
WO2013091579A1
WO2013091579A1 PCT/CN2012/087223 CN2012087223W WO2013091579A1 WO 2013091579 A1 WO2013091579 A1 WO 2013091579A1 CN 2012087223 W CN2012087223 W CN 2012087223W WO 2013091579 A1 WO2013091579 A1 WO 2013091579A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
station controller
handover
user plane
target
Prior art date
Application number
PCT/CN2012/087223
Other languages
English (en)
French (fr)
Inventor
朱星
邹成钢
Original Assignee
华为技术有限公司
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
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2013091579A1 publication Critical patent/WO2013091579A1/zh

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/10—Reselecting an access point controller

Definitions

  • the embodiments of the present invention relate to communication technologies, and in particular, to a mobile station handover method, device, and system. Background technique
  • the base station subsystem (Base Station Subsystem, BSS) local exchange is divided into base station controller (Base Station Controller, BSC) local exchange and base station (Base Transceiver Station) called BTS.
  • BSC local exchange means that when a pair of voice calls is established, if it is detected that both the calling party and the called party are covered by the same BSC, the call signal is looped inside the BSC, and only the mobile switching center (Mobile Switching Center) is reserved. The signaling link releases the occupied A/Ater interface resources and the voice codec (Transcoder).
  • BTS local exchange means that when a pair of voice calls is established, if it is detected that both the calling party and the called party are covered by the same BTS or BTS group, the call signal is looped back in the BTS or BTS group, and only the signaling link of the MSC is reserved. Release the occupied A/Ater interface resources, Abis interface resources, and TC resources.
  • the Local Call Local Switch (LCLS) scheme provided by the 3GPP implements support for lawful interception and supplementary services while implementing local exchange.
  • LCLS Local Call Local Switch
  • the MS switches from the source BTS to the target BTS, if the target BTS and the opposite end BTS If the target BTS and the peer BTS can directly transmit the user plane data stream, the target BTS and the peer BTS can directly transmit the user plane data stream. If the target BTS and the peer BTS belong to different BSCs, the target BTS and the peer end Local exchange cannot be established between BTSs, which occupies more transmission resources and improves transmission delay. Summary of the invention
  • Embodiments of the present invention provide a method and a device for handover of a mobile station, to save transmission resources and reduce transmission delay.
  • a mobile station switching method including:
  • the source base station controller sends a handover request including the first notification information to the target base station controller through the core network, where the first notification information includes a message of the opposite base station controller. a command point, an IP transport layer address of the opposite base station, a voice code used before the local mobile station switches, and an indication information of whether the source base station and the opposite base station directly transmit the user plane data stream;
  • the source base station controller receives a first handover command that includes the second notification information that is sent by the target base station controller by using the core network, where the second notification information includes a signaling point of the target base station controller, The IP transport layer address of the target base station and the indication information that can directly transmit the user plane data stream between the target base station and the opposite base station;
  • the source base station controller sends a first dual-issue indication including the second notification information to the peer base station controller, and the peer base station controller instructs the opposite base station to directly transmit the user plane to the source base station Data stream, and directly transmitting a user plane data stream with the target base station according to the second notification information; the source base station controller sends a handover command to the local mobile station.
  • a source base station controller including:
  • a sending module configured to send, by the core network, a handover request including the first notification information to the target base station controller, where the local mobile station communicates with the opposite mobile station, where the first notification information includes the peer base station controller
  • a receiving module configured to receive, by the target base station controller, a first handover command that includes the second notification information that is sent by using the core network, where the second notification information includes a signaling point and a location of the target base station controller An IP transport layer address of the target base station and indication information capable of directly transmitting the user plane data stream between the target base station and the opposite base station;
  • a switching processing module configured to send, by the peer base station controller, a first dual-issue indication including the second notification information, where the peer base station controller instructs the opposite base station to directly transmit a user plane to the source base station Data stream, and directly transmitting the user to the target base station according to the second notification information a data stream; the source base station controller sends a handover command to the local mobile station.
  • a mobile station switching method including:
  • the target base station controller receives, by the source base station controller, a handover request that includes the first notification information that is sent by the source base station controller by using the first notification information, where the first notification information includes the peer base station controller.
  • the target base station controller allocates an IP transport layer address to the target base station, and if it is determined, according to the first notification information, that the local base station and the opposite base station directly transmit the user plane data stream, the local
  • the target base station controller uses the core network to
  • the source base station controller sends a first handover command including the second notification information, where the second notification information includes a signaling point of the target base station controller, and the target base station
  • the IP transport layer address and the indication information of the user plane data stream can be directly transmitted between the target base station and the opposite base station.
  • a target base station controller including:
  • a receiving module configured to: when the local mobile station and the opposite mobile station are in a conversation, the receiving source base station controller sends a handover request including the first notification information, where the first notification information includes the peer base station control The signaling point of the device, the IP transport layer address of the opposite base station, the voice coding used before the local mobile station switches, and the indication information of whether the source base station and the opposite base station directly transmit the user plane data stream before switching;
  • a handover processing module configured to allocate an IP transport layer address to the target base station, and determine, according to the first notification information, that the source mobile station directly transmits the user plane data stream before the local mobile station handover, and the local
  • the voice coding used after the handover of the mobile station is the same as the voice coding used before the handover, and when the route between the target base station and the opposite base station is determined to be reachable, the core network is sent to the source base station controller by using the core network, including a first switching command of the second notification information;
  • the second notification information includes a signaling point of the target base station controller, an IP transport layer address of the target base station, and between the target base station and the opposite base station Direct indication of user plane data flow.
  • a mobile station switching system including: a first base station controller and a second base station controller; wherein, the first base station controller is the source base station controller, and the second base station controller is It is the above target base station controller.
  • the target base station and the opposite base station can learn the IP transport layer address of the other party. Then, the routing function of the IP transmission network is used to directly transmit the user plane data stream between the target base station and the opposite base station, without forwarding the user plane data stream through other network elements, thereby reducing the transmission bandwidth occupation, saving transmission resources, and reducing The transmission delay during communication.
  • Embodiment 1A is a flowchart of Embodiment 1 of a mobile station handover method according to the present invention
  • FIG. 1B is a flowchart of Embodiment 2 of a mobile station handover method according to the present invention.
  • FIG. 1C is a flowchart of Embodiment 3 of a mobile station handover method according to the present invention.
  • Embodiment 4 of a mobile station handover method according to the present invention is a flowchart of Embodiment 4 of a mobile station handover method according to the present invention
  • Embodiment 5 is a flowchart of Embodiment 5 of a method for switching a mobile station according to the present invention
  • FIG. 4 is a schematic structural diagram of an embodiment of a source base station controller according to the present invention.
  • FIG. 5 is a schematic structural diagram of Embodiment 1 of a target base station controller according to the present invention.
  • Embodiment 2 of a target base station controller according to the present invention
  • FIG. 7 is a schematic structural diagram of an embodiment of a mobile station switching system according to the present invention. detailed description
  • the source base station is the base station to which the local mobile station that initiates the handover belongs before the handover
  • the source base station controller is the base station controller to which the source base station belongs
  • the target base station is switched by the local mobile station.
  • the base station controller, the target base station controller is the base station controller to which the target base station belongs
  • the opposite base station is the base station to which the opposite mobile station communicates with the local mobile station
  • the opposite base station controller is the base station controller to which the opposite base station belongs.
  • the core network part for example, the source mobile switching center is the mobile switching center to which the source base station controller belongs
  • the target mobile switching center is the mobile switching center to which the target base station controller belongs
  • the opposite mobile switching center is the opposite base station.
  • the mobile switching center to which the controller belongs can be applied to various communication systems.
  • the base station can be a BTS in a 2G network
  • the base station controller can be a BSC in a 2G network.
  • the base station can also be a NodeB in a 3G network.
  • the controller can also be a radio network controller (Radio Network Controller, RNC) in the 3G network.
  • RNC Radio Network Controller
  • the source base station controller, the target base station controller, and the opposite base station controller are respectively logically different base station controllers, which may be physically a base station controller or may be independent. Separate base station controller.
  • the target mobile switching center, the source mobile switching center, and the peer mobile switching center are respectively logically different mobile switching centers, which may be physically a mobile switching center or an independent mobile switching center.
  • FIG. 1A is a flowchart of Embodiment 1 of a mobile station handover method according to the present invention.
  • the source base station controller belongs to the local base station controller before the local mobile station switches, and how to make the handover when the local mobile station initiates the inter-base station controller handover process when the local mobile station communicates with the opposite mobile station.
  • the target base station and the opposite base station implement direct transmission of the user plane data stream.
  • This embodiment is applicable to a scenario in which the source base station controller and the target base station controller belong to the same MSC, and is also applicable to the scenario in which the source base station controller and the target base station controller do not belong to the same MSC. As shown in FIG. 1A, this embodiment includes:
  • Step 11 The source base station controller sends a handover request including the first notification information to the target base station controller through the core network during the conversation between the local mobile station and the opposite mobile station, where the first notification information includes the peer base station controller.
  • the source base station controller may determine, according to the measurement report sent by the local mobile station, whether the local mobile station needs to be performed between different base station controllers. Switching, if yes, the source base station controller may send a handover request including the first notification information to the target base station controller through the core network, for example, the source base station controller may move to the source The mobile switching center sends a Handover Required message, and after receiving the handover request message from the source base station controller, the source mobile switching center sends a Handover Request message to the target base station controller through the target mobile switching center.
  • the handover request message and the handover request message both include the first notification information.
  • the IP transport layer address in the first notification information may be an IP address and a UDP port number, and the signaling point of the peer base station controller may be equivalent to the identifier of the peer base station controller.
  • Step 12 The source base station controller receives a first handover command that includes the second notification information that is sent by the target base station controller through the core network.
  • the second notification information includes a signaling point of the target base station controller, and an IP transport layer address of the target base station.
  • the indication information that can directly transmit the user plane data flow between the target base station and the opposite base station.
  • the target base station controller may allocate an IP transport layer address to the target base station while allocating a new channel to the target base station. If the target base station controller determines that the source base station and the opposite base station directly transmit the user plane data stream before the mobile station handover, the voice code used after the local mobile station handover is the same as the voice code used before the handover, and between the target base station and the opposite base station. The route is reachable, and it is determined that a mesh connection (Mesh connecting) can be established between the opposite base station and the target base station, that is, the target base station and the opposite base station can directly transmit the user plane data stream through the routing function of the IP transmission network.
  • a mesh connection Mesh connecting
  • the target base station controller sends a first handover command including the second notification information to the source base station controller through the core network.
  • the target base station controller may send a first handover request response message to the target mobile switching center, and the target mobile switching center After receiving the first handover request response message, the first handover command is sent to the source base station controller by the source mobile switching center.
  • the first handover request response message and the first handover command each include second notification information.
  • Step 13 The source base station controller sends a first dual-issue indication including the second notification information to the peer base station controller, and the peer base station controller instructs the opposite base station and the source base station to directly transmit the user plane data stream, and according to the second The notification information directly transmits the user plane data stream with the target base station; the source base station controller sends a handover command to the local mobile station.
  • the source base station controller after receiving the first handover command including the second notification information, sends the second notification information to the opposite base station controller by using an interface with the opposite base station controller.
  • a pair of indications is sent by the peer base station controller to the opposite base station to forward the first dual-issue indication (Mesh Handover Prepare).
  • the peer base station After the peer base station receives the first dual-issue indication, the base station and the source base station While directly transmitting the user plane data stream, the peer base station further directly transmits the user plane data stream to the target base station according to the second notification information, that is, the signaling point of the target base station controller and the IP transport layer address of the target base station.
  • the user plane data flow between the local mobile station and the opposite mobile station is directly transmitted between the opposite base station and the source base station, it is also directly transmitted on the MESH connection between the opposite base station and the target base station.
  • the target base station and the opposite base station after the local mobile station handover can learn each other.
  • the IP transport layer address utilizes the routing function of the IP transport network to directly transmit the user plane data stream between the target base station and the peer base station, without forwarding the user plane data stream through other network elements, thereby reducing the transmission bandwidth occupation and saving Transmission resources reduce the transmission delay during communication.
  • FIG. 1B is a flowchart of Embodiment 2 of a mobile station handover method according to the present invention. As shown in FIG. 1B, the description of steps 11-13 is similar to the description of steps 11-13 in the embodiment of FIG. 1A, and details are not described herein again. After step 13, optionally, steps 14 and 15 may also be included:
  • Step 14 After the local mobile station accesses the target channel according to the handover command of the source base station controller, the source base station controller receives the first clear command sent by the core network.
  • the source base station controller after receiving the first handover command including the second notification information, the source base station controller further sends a handover command to the local mobile station, indicating that the local mobile station accesses the target channel.
  • the target base station controller may send a first handover complete message to the target mobile switching center.
  • the target mobile switching center After receiving the first handover complete message, the target mobile switching center sends a first clear command (Clear Command) to the source base station controller through the source mobile switching center to notify the source base station that the local mobile station has successfully accessed the target channel.
  • the first clear command further includes indication information that directly transmits the user plane data stream between the target base station and the opposite base station.
  • Step 15 The source base station controller releases the resources occupied by the local mobile station, and sends a first dual-issue cancellation indication to the peer base station controller, and the peer base station controller instructs the opposite base station to stop directly transmitting the user plane data with the source base station. flow.
  • the source base station controller learns that the local mobile station successfully accesses the channel of the target base station controller, the resource occupied by the local mobile station is released, and the first dual-issue cancellation indication is sent to the peer base station controller.
  • the end base station controller instructs the opposite base station to stop directly transmitting the user plane data stream with the source base station. At this point, the user plane data flow between the local mobile station and the peer mobile is directly transmitted only between the opposite BTS and the target BTS.
  • step 12 if the target base station controller determines, according to the first notification information, that the source base station and the opposite base station do not directly transmit the user plane data stream before the local mobile station handover, or after determining that the local mobile station switches,
  • the voice coding used is different from the voice coding used before the handover, or when the route between the target base station and the opposite base station is unreachable, that is, when the target base station controller determines that the target base station and the opposite base station cannot establish the MESH connection
  • the source base station receives the second handover command that is sent by the target base station controller and includes the third notification information, and the third notification information includes that the target base station and the opposite base station cannot establish the MESH connection, that is, the user plane data flow cannot be directly transmitted.
  • the source base station controller After receiving the second handover command, the source base station controller sends a handover command to the local mobile station, and sends a second dual-issue indication to the peer base station controller, where the second dual-issue indication includes no between the target base station and the opposite base station. Direct indication of user plane data flow.
  • the peer base station controller forwards the second dual-issue indication to the opposite base station.
  • the peer base station learns that the target base station and the opposite base station do not directly transmit the user plane data stream, and interacts with the source base station according to the second dual-issue indication, and the target base station Interacting user plane data streams through indirect delivery.
  • the target base station controller After the local mobile station accesses the target channel according to the handover command of the source base station controller, the target base station controller sends a second handover complete message to the core network, for example, to the target mobile switching center, and then the target mobile switching center passes the source mobile exchange.
  • the center sends a second clear command to the source base station controller, and after receiving the second clear command, the source base station controller releases the resources occupied by the local mobile station, and sends a second dual-issue cancellation indication to the peer base station controller,
  • the end base station controller instructs the opposite base station to stop interacting with the source base station for user plane data flow.
  • FIG. 1C is a flowchart of Embodiment 3 of a mobile station handover method according to the present invention.
  • the target base station controller belongs to the perspective of the target base station controller after the mobile station is switched, and the target base station after the local mobile station initiates the inter-base station controller handover process when the local mobile station communicates with the opposite mobile station. How to implement direct transfer of user plane data streams with the peer base station.
  • the embodiment includes: Step 21: During a call between the local mobile station and the opposite mobile station, the target base station controller receives the handover that includes the first notification information sent by the source base station controller through the core network.
  • the first notification information includes a signaling point of the peer base station controller, an IP transport layer address of the opposite base station, a voice code used before the local mobile station switches, and whether the source base station and the opposite base station directly transmit the user plane before the handover.
  • the indication of the data stream includes a signaling point of the peer base station controller, an IP transport layer address of the opposite base station, a voice code used before the local mobile station switches, and whether the source base station and the opposite base station directly transmit the user plane before the handover.
  • the source base station controller may send a Handover Required message to the source mobile switching center, and the source mobile switching center receives the handover request message of the source base station controller.
  • the target mobile switching center sends a Handover Request message to the target base station controller.
  • the handover request message and the handover request message both include the first notification information.
  • the IP transport layer address in the first notification information may be an IP address and a UDP port number.
  • Step 22 The target base station controller allocates an IP transport layer address to the target base station, and determines, according to the first notification information, that the source base station and the opposite base station directly transmit the user plane data stream before the local mobile station handover, and the local mobile station switches.
  • the target base station controller sends a first handover command including the second notification information to the source base station controller through the core network;
  • the two notification information includes a signaling point of the target base station controller, an IP transport layer address of the target base station, and indication information that can directly transmit the user plane data stream between the target base station and the opposite base station.
  • the target base station controller after receiving the handover request message of the target mobile switching center, allocates a channel to the target base station, and allocates an IP transport layer address to the target base station.
  • the target base station controller sends the IP transport layer address allocated to the target base station to the target base station through the channel activation indication.
  • the target base station controller determines, according to the first notification message, whether the source base station and the opposite base station directly transmit the user plane data stream before the local mobile station switches, and if the local mobile station switches, the source base station and the opposite base station directly transmit the user plane.
  • the data stream further determines whether the voice code used after the local mobile station is switched is the same as the voice code used before the handover.
  • the second handover request message is carried in the first handover request response sent to the core network.
  • the target base station controller may send a first handover request response (Handover Request Ack) to the target mobile switching center when the route between the target base station and the opposite base station is reachable, and the target mobile center passes the source mobile switching center to the source.
  • the base station controller sends a first handover command (Handover Command).
  • the first handover request response message and the first handover command each include second notification information.
  • the target base station controller After the local mobile station accesses the target channel, the target base station controller sends the first handover to the core network.
  • the completion message, the first handover complete message includes indication information directly transmitting the user plane data flow between the target base station and the opposite base station.
  • the target mobile switching center After receiving the first handover complete message, the target mobile switching center determines that the mobile station has successfully accessed the channel of the target base station controller, and the target mobile switching center sends a first clear command to the source base station controller through the source mobile switching center, so that the target mobile switching center sends the first clearing command to the source base station controller.
  • the source base station controller releases the resources occupied by the local mobile station.
  • the target base station controller sends a first handover complete (Handover Complete) message to the target mobile switching center, and the source mobile switching center sends a first clear command to the source base station controller (Clear Command).
  • Handover Complete a first handover complete
  • the source mobile switching center sends a first clear command to the source base station controller (Clear Command).
  • the target base station controller receives the handover request message including the first notification information sent by the source base station controller through the core network
  • the target base station controller determines, according to the first notification information, the source base station and the pair before the local mobile station handover
  • the terminal base station does not directly transmit the user plane data stream, or determines that the voice code used after the local mobile station handover is different from the voice code used before the handover, or determines that the route between the target base station and the opposite base station is unreachable, and the target base station controls
  • the device sends a second handover command (Handover Command) to the source base station controller through the core network; the second handover command includes indication information that the target base station and the opposite base station cannot directly transmit the user plane data stream.
  • Handover Command second handover command
  • the second handover command may further include a signaling point of the target base station controller and an IP transport layer address of the target base station.
  • the target base station controller After the local mobile station accesses the target channel, the target base station controller sends a second handover complete (Handover Complete) message to the core network, where the second handover complete message includes that the user base data stream cannot be directly transmitted between the target base station and the opposite base station.
  • the target mobile switching center After receiving the second handover complete message, the target mobile switching center determines that the mobile station has successfully accessed the channel of the target base station controller, and the second clear command sent by the target mobile switching center to the source base station controller through the source mobile switching center (Clear Command) ), so that the source base station controller releases the resources occupied by the local mobile station.
  • the second clearing command further includes indication information that the target base station and the opposite base station cannot directly transmit the user plane data stream.
  • the target base station and the opposite base station after the local mobile station handover can know each other's IP transport layer address. Then, the routing function of the IP transmission network is used to directly transmit the user plane data stream between the target base station and the opposite base station, without forwarding the user plane data stream through other network elements, thereby reducing the transmission bandwidth occupation, saving transmission resources, and reducing The transmission delay during communication.
  • FIG. 2 is a flowchart of Embodiment 4 of a mobile station handover method according to the present invention.
  • a BTS and a BSC in a 2G network are taken as an example to describe a mobile station handover method.
  • the communication interface between the BTS and the BSC is called an Abis interface, and the Abis interface is called an IP Abis interface after IP.
  • This embodiment is applicable to Abis. Over IP scenario.
  • the source base station to which the MSI handover belongs is BTS1, the base station controller to which the BTS1 belongs is BSC1, and the MSC to which the BSC1 belongs is MSCl;
  • the target base station to which the MS1 handover belongs is BTS2, and the base station controller to which the BTS2 belongs is BSC2, BSC2
  • the MSC to which the MSC belongs is MSC2, and the BSC2 is connected to the MSC2 through the MSW (Media Gate Way) 2;
  • the BTS to which the MS2 belongs is tBTS, the BSC to which the tBTS belongs is tBSC, the MSC to which the tBSC belongs is tMSC, and the tBSC passes tMGW and tMSC. connection.
  • the MSI is switched from BSC1 to BSC2, and tBSC and BSC2 belong to different MSCs, and BSC1 and BSC2 also belong to different MSCs.
  • the MS1 initiates a cross-BSC handover, and the BTS2 to which the MS1 is switched and the tBTS to which the peer MS2 belongs can directly transmit the user plane data stream.
  • the BSC1 and the BSC2 belong to different MSCs, and the BSC1 and the BSC2 belong to different MSCs.
  • the difference between the BSC1 and the BSC2 is BSC1 and BSC2. The information between them does not need to be forwarded through the core network.
  • this embodiment includes:
  • Step la The MSI sends a measurement report to the BTS1.
  • Step 2a BTS1 sends the pre-processing result to BSC1.
  • MS1 and MS2 perform a call process, and MS1 measures the signal quality of the current cell and sends a measurement report to the source base station BTS1.
  • BTS1 After receiving the measurement report of MS1, BTS1 sends the pre-processing result to its own BSC1.
  • MS1 sends a Measurement Report message to BTS1
  • BTS 1 sends a Pre_measurment Result message to BSC1.
  • the BSC to which MS2 belongs is tBSC
  • the MSC to which tBSC belongs is tMSC.
  • Step 3a The BSC1 sends a handover request message to the MSCl.
  • the handover request message includes a signaling point of the tBSC, an IP transport layer address of the tBTS, and a speech codec and an MSI connection state of the MS1 before the handover.
  • BSC1 determines according to the measurement report that MS1 needs to perform cross-BSC switching
  • the MSC1 sends a handover request message, and carries the IP transmission layer address of the tBTS, the signaling point of the tBSC, and the MESH connection state of the MS1 before the handover in the handover request message.
  • the MESH connection status indicates whether the BTS1 and tBTS directly transmit the user plane data stream before the MS1 switch.
  • the BSC1 sends a Handover Required message to the MSC1, where the Handover Required message includes the cell provided by the embodiment of the present invention: Old BSS to New BSS Information.
  • the cell Old BSS to New BSS Information provided by the embodiment of the present invention includes: BSC Signalling Code, Mesh Transport Layer Address (BTS), Used Speech Codec, and Mesh Connect Result.
  • BSC Signalling Code is the signaling point of the BSC to which the peer MS belongs.
  • the Mesh Transport Layer Address (BTS) is the IP transport layer address of the BTS to which the peer MS belongs.
  • the Used Speech Codec is the Speech Codec used by the MSI before the handover.
  • Mesh Connect Result is the Mesh connection status of the MS before the switch.
  • Table 1 except for the index with the "*" sign, the reference in the table refers to the chapter in 3GPP TS48.008.
  • Table 1 is Old BSS to New BSS Information
  • the BSC Signalling Code is used to identify the signaling point of the BSC.
  • the binary number is used to indicate the decimal signaling point as shown in Table 2.
  • Table 2 shows the BSC Signalling Code
  • the Old BSS to New BSS information sent by the BSC1 to the MSC1 includes: a signaling point of the tBSC, an IP transport layer address of the tBTS, a Speech Codec used by the MSI before the handover, and a Mesh connection state before the handover.
  • Step 4a The core network sends a handover request message to the BSC2, where the handover request message includes a signaling point of the tBSC, a MESH connection state of the MS1 before the handover, an IP transport layer address of the tBTS, and a Speech Codec used by the MS1 before the handover.
  • the handover request message includes a signaling point of the tBSC, a MESH connection state of the MS1 before the handover, an IP transport layer address of the tBTS, and a Speech Codec used by the MS1 before the handover.
  • MSC2 After the handover request of BSC1 arrives at MSC2, MSC2 sends a handover request message to BSC2.
  • MSC1 sends a Map Prepare HO Request to MSC2, and MSC2 sends a Handover Request message to BSC2.
  • the Handover Request message includes the cell Old BSS to New BSS Information, and the Old BSS to New BSS Information includes: tBSC signaling point, tBTS The IP transport layer address and the Speech Codec that the MSI uses before switching.
  • the Old BSS to New BSS Information also includes the Mesh connection of the MSI before switching.
  • Step 5a BSC2 allocates a new channel and IP transport layer address for BTS2, and sends a channel activation indication to BTS2. Determines the Speech Codec phase used by MS1 before the handover Mesh connection is established and the Speech Codec used before MS1 handover is switched with MS1. At the same time, BTS2 and tBTS are notified to perform route reachability detection.
  • the BSC2 Based on the Mesh connection status of the MS1 in the handover request message, the BSC2 determines that the Mesh connection is established before the handover, that is, the BTS1 and the tBTS directly transmit the user plane data flow, and determines the use of the Speech Codec and the MSI used before the MS1 handover.
  • the Speech Codec is the same, and the BTS2 and the tBTS are notified to perform route reachability detection.
  • Step 6a BTS2 and tBTS perform route reachability detection.
  • the BTS2 performs route reachability detection with the tBTS according to the signaling point of the tBSC, the IP transport layer address of the tBTS, and the IP transport layer address of the BTS2.
  • Step 7a The BTS2 sends a channel activation confirmation including the route reachability detection result to the BSC2. For example, after the BSC2 sends the Channel Activation message to the BTS2, it receives the Channel Activation Ack message of the BTS2, and the Channel Activation Ack message includes the detection result after the BTS2 and the tBTS perform the route reachability detection.
  • Step 8a The BSC2 determines, according to the route reachability detection result of the BTS2, that the route between the tBTS and the BTS2 is reachable, and sends a first handover request response to the MSC2, where the first handover request response includes the signaling point of the BSC2 and the IP transport layer of the BTS2.
  • the address and the indication of the MESH connection can be established between BTS2 and tBTS.
  • the BSC2 determines that the tBTS and the BTS2 route are reachable according to the route reachability detection result of the BTS2, it is determined that the MESH connection can be established between the BTS2 and the tBTS, and the signaling point of the BSC2 and the IP transmission of the BTS2 are notified to the tBSC by the first handover request response.
  • the layer address and the indication information of the MESH connection can be established between the BTS2 and the tBTS. For example, BSC2 sends a Handover Request Ack message to MSC2, which has a new cell extension: New BSS to Old BSS Information
  • the cell New BSS to Old BSS Information provided by the embodiment of the present invention includes: BSC Signaling Code ⁇ Mesh Transport Layer Address and Selected Speech Codec. Among them, is the signaling point of the BSC where the MS is switched, Mesh Transport Layer Address is the IP transport layer address of the BTS where the MS is switched. Selected Speech Codec is the Speech Codec used after the MS switch. In Table 3, except for the index with the "*" sign, the index in the table refers to the chapter in 3GPP TS48.008.
  • Table 3 shows the New BSS to Old BSS Information cell.
  • the New BSS to Old BSS Information in the Handover Request Ack message includes: a signaling point of the BSC2, an IP transport layer address of the BTS2, and a Mesh Control Indicator, where the Mesh Control Indicator indicates that an MESH connection can be established between the BTS2 and the tBTS.
  • Step 9a The core network sends a first handover command to the BSC1, where the first handover command includes a signaling point of the BSC2, an IP transport layer address of the BTS2, and an indication that the MESH connection can be established between the BTS2 and the tBTS.
  • MSC2 sends a Map Prepare HO Response message to MSC1
  • MSC1 sends a Handover Command message to BSC1
  • the Handover Command message includes a new cell: New BSS to Old BSS Information
  • New BSS to Old BSS Information includes: BSC2 signaling point, BTS2 IP transport layer address and Mesh Control Indicato, Mesh Control Indicator indicates that an MSH connection can be established between BTS2 and tBTS.
  • Step 10a The BSC1 sends a first dual-issue indication to the tBSC, indicating that the tBTS and the BTS1 directly transmit the user plane data stream, and directly transmit the user plane data stream with the BTS2, where the first dual-issue indication includes the signaling point of the BSC2 and the IP transmission of the BTS2.
  • the layer address and the indication information of the MESH connection can be established between the BTS2 and the tBTS.
  • BSC1 sends a Mesh Handover Prepare message to the tBSC.
  • Table 4 is a Mesh Handover Prepare message according to an embodiment of the present invention. As shown in Table 4, except for the index with the "*" sign, the reference in Table 4 refers to the chapter in 3GPP TS48.008.
  • the recommended value for Message Type is: 0111 1001.
  • the Mesh Control Indicator is used to notify the peer BSC whether the Mesh connection can be established after the MS is switched.
  • the BSC Signalling Code is used to notify the peer BSC: MS switch. The signaling point of the target BSC to be located later; the Mesh Transport Layer Address (BTS) is used to notify the opposite end BSC: the IP transport layer address of the target BTS where the MS is switched.
  • BTS Mesh Transport Layer Address
  • Table 4 shows the Mesh Handover Prepare message.
  • the Mesh Handover Prepare message includes the signaling point of the BSC2, the IP transport layer address of the BTS2, and the indication information that the MESH connection can be established between the BTS2 and the tBTS.
  • Step 11a The tBSC sends a first dual-issue indication to the tBTS.
  • the first dual-issue indication includes a signaling point of the BSC2, an IP transport layer address of the BTS2, and an indication that a MESH connection can be established between the BTS2 and the tBTS.
  • the user plane data stream is directly transmitted between the tBTS and the BTS1, and the user plane data stream is directly transmitted to the BTS2 through the routing function of the IP transport layer address of the BTS2.
  • Step 12a BSC1 sends a handover command to MS1 through BTS1.
  • BSC1 sends a Handover Command to BTS1 to instruct the MSI to access the new channel allocated by BSC2.
  • Step 13a The MSI accesses the target channel according to the handover command of the BSC1.
  • Step 14a After determining that the MS1 accesses the target channel, the BSC2 sends a first handover success confirmation to the MSC2.
  • the first handover complete message sent by the BSC2 may further include indication information that the MESH connection has been established after the MS1 handover and an IP transport layer address of the BTS2, so that the indication information of the MESH connection and the IP transmission of the BTS2 are established after the BSC1 switches the MS1.
  • the tBSC confirms the IP transport layer address of the BTS2, and confirms the MESH connection status between the tBTS and the BTS2 after the MS1 switch.
  • BSC2 sends a Handover Complete message to MSC2.
  • the contents of the Handover Complete message are shown in Table 5.
  • Cell extended by Handover Complete message in the embodiment of the present invention Includes Mesh Connect Result and Transport Layer Address (BTS).
  • the Mesh Connect Result is the MESH connection state after the MS switch; the Mesh Transport Layer Address (BTS) is the IP transport layer address of the BTS.
  • the Mesh Connect Result indicates that the MISH connection has been established after the MSI handover, that is, the MESH connection is established between the BTS2 and the tBTS, and the Transport Layer Address (BTS) is the IP transport layer address of the BTS2.
  • Message Type is the message type; Talker Priority is the call priority; Codec List (BSS Supported) is the Codec list supported by BSS; Chosen Encryption Algorithm is the synchronization algorithm; Chosen Channel is the channel allocated for MSI; Speech Codec ( Chosen) is the Speech Codec used after the MSI switch.
  • Step 15a The core network sends a first clear command to BSC1.
  • MSC2 sends a Map Send End Signal Request (HO Complete) message to MSC1, and MSC1 sends a Clear Command message shown in Table 6 to BSC1.
  • Message Type is a message type; Mesh Connect Result is MSH after MS switching. Connection Status.
  • the index in the table refers to the early in 3GPP TS48.008.
  • the Clear Command message includes the indication information that the MESH connection has been established after the MS1 handover and the IP transport layer address of the BTS2.
  • Table 5 is the Handover Complete message.
  • Table 6 is the Clear Command message. INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
  • Step 16a BSC1 releases the resources occupied by the MSI and sends a first dual-issue cancellation indication to the tBSC, instructing the tBTS to stop directly transmitting the user plane data stream with the BTS1.
  • the BSC1 After receiving the first clear command sent by the core network, the BSC1 releases the resources occupied by the MS1 and sends a first dual-issue cancellation indication to the tBSC.
  • the first clearing command may further include the indication information of the MESH connection and the IP transport layer address of the BTS2 after the MS1 is switched
  • the first dual-issue cancellation indication may further include the indication information that the MESH connection has been established after the MS1 handover, and the BTS2 IP transport layer address.
  • the tBTS can confirm the IP transport layer address of the BTS2 through the first dual cancellation instruction, and confirm that the MESH connection has been established after the MS1 switch.
  • the BSC1 sends a Mesh Handover Complete message to the tBSC.
  • the Mesh Handover Complete message provided by the embodiment of the present invention includes a Message Type and a Mesh Connect Result. Except for the index with the "*" sign, the index in Table 7 refers to the chapter in 3GPP TS48.008.
  • the value of the Message Type is 0111 1010.
  • the Mesh Connect Result is used to notify the peer BSS whether the Mesh connection is established after the switchover.
  • the Mesh Handover Complete message includes the indication information that the MESH connection has been established after the MS 1 handover and the IP transport layer address of the BTS2.
  • Table 7 shows the Mesh Handover Complete message.
  • Step 17a The tBSC sends a first double cancellation indication to the tBTS.
  • the tBTS stops interacting with the BTS1 user plane data stream. Thereafter, the user plane data stream between MS1 and MS2 is passed directly between tBTS and BTS2.
  • FIG. 3 is a flowchart of Embodiment 5 of a mobile station handover method according to the present invention.
  • the MS1 and the peer MS2 are in the process of communication, and the MS1 initiates a cross-BSC handover.
  • the MSSH connection between the BTS2 to which the MS1 belongs and the tBTS to which the peer MS2 belongs cannot be established, that is, cannot be directly transmitted.
  • User plane data stream As shown in FIG. 3, this embodiment includes:
  • Step lb The MSI sends a measurement report to BTS1.
  • Step 2b BTS1 sends the pre-processing result to BSC1.
  • Step 3b The BSC1 sends a handover request message to the MSC1.
  • the handover request message includes a signaling point of the tBSC, an IP transport layer address of the tBTS, and a speech codec and an MSI connection state of the MS1 before the handover.
  • Step 4b The core network sends a handover request message to the BSC2, where the handover request message includes a signaling point of the tBSC, a MESH connection state of the MS1 before the handover, an IP transport layer address of the tBTS, and a Speech Codec used by the MS1 before the handover.
  • the handover request message includes a signaling point of the tBSC, a MESH connection state of the MS1 before the handover, an IP transport layer address of the tBTS, and a Speech Codec used by the MS1 before the handover.
  • Step 5b BSC2 allocates a new channel and IP transport layer address for BTS2, and sends a channel activation indication to BTS2 to determine the Speech Codec phase that MS1 uses before the switch Mesh connection is established and before the MS1 switch uses the Speech Codec and MS1 switch.
  • BTS2 and tBTS are notified to perform route reachability detection.
  • When Codec is inconsistent, BTS2 and tBTS are not notified to perform route reachability detection.
  • Step 6b BTS2 and tBTS perform route reachability detection.
  • Step 7b The BTS2 sends a channel activation confirmation including the route reachability detection result to the BSC2.
  • Step lb to step 7b are the same as steps la to 7a.
  • Step 8b The BSC2 determines, according to the route reachability detection result of the BTS2, that the route between the tBTS and the BTS2 is unreachable, and sends a second handover request response to the MSC2, where the second handover request response includes an indication that the MESH connection cannot be established between the BTS2 and the tBTS. information.
  • the MESH connection cannot be established between the tBTS and the BTS2, and the BSC2 sends a second handover request response to the MSC2.
  • the second handover request response may further include a Speech Codec used after the MS1 is switched.
  • Step 9b The core network sends a second handover command to the BSC1, where the second handover command includes indication information that the MESH connection cannot be established between the BTS2 and the tBTS.
  • the second switching command may further include a voice coding used after the MS1 is switched.
  • Step 10b The BSC1 sends a second dual-issue indication to the tBSC, where the second dual-issue indication includes indication information that the MESH connection cannot be established between the BTS2 and the tBTS.
  • the second dual-issue indication is used to indicate that the tBTS interacts with the BTS1 user plane data stream, and interacts with the user plane data to the BTS2 through indirect delivery. Hey.
  • Step lib The tBSC sends a second dual-issue indication to the tBTS.
  • the tBTS After receiving the second dual-issue indication of the tBSC, the tBTS interacts with the BTS2 to interact with the user plane data stream and interacts with the BTS2 through the non-direct delivery mode. If the BTS1 establishes a MESH connection with the tBTS before the handover, the user plane data stream is directly transmitted between the tBTS and the BTS1. If the METS connection is not established between the BTS1 and the tBTS before the switchover, the user plane data stream is exchanged with the BTS2 through the indirect transfer mode.
  • the second handover command may further include a voice code used after the MS1 is switched
  • the second dual-issue indication may further include a voice code used after the MS1 switch.
  • the tBTS uses the voice code used after the MS1 handover carried by the second dual-issue indication, and interacts with the BTS2 user plane data stream.
  • Step 12b BSC1 sends a handover command to MS1 through BTS1.
  • Step 13b The MSI accesses the target channel according to the handover command of the BSC1.
  • Step 14b After determining that the MS1 accesses the target channel, the BSC2 sends a second handover completion message to the MSC2.
  • the second handover complete message may further include indication information that the METS connection cannot be established between the BTS2 and the tBTS, so that after the tBTS receives the second dual-issue cancellation indication, it is confirmed that the MESH connection cannot be established between the BTS2 and the tBTS.
  • Step 15b The core network sends a second clear command to BSC1.
  • Step 16b The BSC1 releases the resource occupied by the MSI, sends a second dual-issue cancellation indication to the tBSC to indicate that the tBTS stops transmitting the user plane data stream to the BTS1, and the second dual-issue cancellation indication includes an indication that the MESH connection cannot be established between the tBTS and the BTS2. information.
  • Step 17b The tBSC sends a second double cancellation indication to the tBTS.
  • the second clearing command may further include indication information that the MESH connection is not established between the BTS2 and the tBTS
  • the second dual-issue cancellation indication may further include indication information that the MESH connection cannot be established between the BTS2 and the tBTS.
  • the tBTS After receiving the second dual-issue cancellation indication, the tBTS stops interacting with the BTS1 user plane data stream. Thereafter, tBTS and BTS2 interact with the user plane data stream between MS1 and MS2 through indirect transfer.
  • Step 18b If the MESH connection status changes after the MS1 handover, the tBSC sends a notification message to the tMSC, informing the tMSC that the MESH connection status changes after the MS1 handover. After receiving the second dual-issue cancellation indication, the tBSC confirms that the MESH connection cannot be established after the MS1 handover. If the MSH connection is established before the MS1 handover, the tBSC sends a notification message to the tMSC, for example, sends a Mesh Connect Report message to the tMSC, informing the tMSC that the MMSC is in the MSI. The MESH connection cannot be established after switching.
  • the tBSC sends a Mesh Connect Report message as shown in Table 8 to the tMSC.
  • Table 8 shows the Mesh Connect Report message.
  • the BSC2 determines that the tBTS and the BTS2 cannot establish a MESH connection, and sends a second handover request response to the MSC2, where the second handover request response includes indication information that the tBTS and the BTS2 cannot establish a MESH connection.
  • FIG. 4 is a schematic structural diagram of an embodiment of a source base station controller according to the present invention.
  • the source base station controller of this embodiment may be the base station controller to which the mobile station that initiated the handover belongs before switching.
  • the embodiment includes: a sending module 41, a receiving module 42, and a switching processing module 43.
  • the sending module 41 is configured to send, by the core network, a handover request including the first notification information to the target base station controller during the conversation between the local mobile station and the opposite mobile station, where the first notification information includes the peer base station controller
  • the first notification information includes the peer base station controller
  • the receiving module 42 is configured to receive, by the target base station controller, a first handover command that includes the second notification information that is sent by using the core network, where the second notification information includes a signaling point of the target base station controller,
  • the IP transport layer address of the target base station and the indication information of the user plane data stream can be directly transmitted between the target base station and the opposite base station.
  • the handover processing module 43 is configured to send, by the peer base station controller, a first dual-issue indication including the second notification information, where the peer base station controller instructs the peer base station to directly transmit the user to the source base station Transmitting a user plane data stream directly to the target base station according to the second notification information; and sending a handover command to the local mobile station.
  • the receiving module 42 is further configured to: after the local mobile station accesses the target channel according to the handover command of the source base station controller, receive the core network, and send the The first clear command.
  • the first clear command further includes indication information that directly transmits the user plane data flow between the target base station and the opposite base station.
  • the switching processing module 42 is further configured to release the resource occupied by the local mobile station, and send a first dual-issue cancellation indication to the peer base station controller, where the peer base station controller indicates the pair The end base station stops directly transmitting the user plane data stream with the source base station.
  • the target base station and the opposite base station may not be able to establish a MESH connection.
  • the source base station controller may also implement the local mobile station handover by using the above module.
  • the receiving module 42 is further configured to receive a second handover command sent by the target base station controller by using the core network, where the second handover command includes that the target base station and the opposite base station cannot directly transmit a user plane The indication of the data stream. Further, the second handover command further includes a signaling point of the target base station controller and an IP transport layer address of the target base station.
  • the switching processing module 43 is further configured to send a second dual-issue indication to the peer base station controller, where the peer base station controller instructs the peer base station to interact with the source base station to exchange user plane data streams, And the user plane data stream is exchanged with the target base station by using a non-direct transmission mode, where the second dual-issue indication includes indication information that the user base station and the opposite base station cannot directly transmit the user plane data stream.
  • the receiving module 42 is further configured to: after the local mobile station accesses the target channel according to the switching command of the source base station controller, receive a second clear command sent by the core network. Further, the second clearing command further includes indication information that the target base station and the opposite base station cannot directly transmit the user plane data stream.
  • the handover processing module 43 is further configured to release the resource occupied by the mobile station, and send a second dual-issue cancellation indication to the peer base station controller, where the peer base station controller indicates the opposite base station Stop interacting with the source base station for user plane data flow.
  • the target base station and the opposite base station can learn from each other.
  • the IP transport layer address of the party, and then the routing function of the IP transport network is used to directly transmit the user plane data stream between the target base station and the opposite base station, without forwarding the user plane data stream through other network elements, thereby reducing the transmission bandwidth occupation. It saves transmission resources and reduces transmission delay during communication.
  • FIG. 5 is a schematic structural diagram of Embodiment 1 of a target base station controller according to the present invention.
  • the target base station controller of this embodiment may be the target base station controller to which the mobile station that initiated the handover belongs after handover.
  • the embodiment includes: a receiving module 51 and a switching processing module 52.
  • the receiving module 51 is configured to: when the local mobile station and the opposite mobile station are in a conversation, the receiving source base station controller sends, by using the core network, a handover request that includes the first notification information, where the first notification information includes the opposite base station The signaling point of the controller, the IP transport layer address of the opposite base station, the voice coding used before the local mobile station switches, and the indication information of whether the source base station and the opposite base station directly transmit the user plane data stream.
  • the handover processing module 52 is configured to allocate an IP transport layer address to the target base station, and determine, according to the first notification information, that the source mobile station directly transmits the user plane data stream before the local mobile station handover, and the The voice code used after the local mobile station is switched is the same as the voice code used before the handover, and when the route between the target base station and the opposite base station is determined to be reachable, the core network sends the source base station controller to the source base station controller.
  • a first handover command including the second notification information, where the second notification information includes a signaling point of the target base station controller, an IP transport layer address of the target base station, and the target base station and the opposite base station Directly pass instructions for the user plane data stream.
  • FIG. 6 further comprising: a sending module 53 on the basis of FIG.
  • the sending module 53 is configured to send, after the local mobile station accesses the target channel, a first handover complete message to the core network, where the first handover complete message includes the target base station and the opposite end
  • the indication information of the user plane data stream is directly transmitted between the base stations.
  • the target base station and the opposite base station may not be able to establish a MESH connection.
  • the source base station controller may also implement the local mobile station handover by using the above module.
  • the switching processing module 52 is further configured to: if determining, according to the first notification information, that the local mobile station switches the source base station and the opposite base station to directly transmit the user plane data stream, or determines the local mobile station switching The voice coding used later is different from the voice coding used before the handover, or when the route between the target base station and the opposite base station is unreachable, the source base station is controlled by the core network.
  • the controller sends a second handover command, where the second handover command includes indication information that the target base station and the opposite base station cannot directly transmit the user plane data stream.
  • the sending module 53 is further configured to: after the local mobile station accesses the target channel, send a second handover complete message to the core network, where the second handover complete message includes the target base station and the pair The indication information of the user plane data stream is not directly transmitted between the end base stations.
  • the target base station and the opposite base station can learn the IP transport layer address of the other party, and then use the IP.
  • the routing function of the transport network directly transmits the user plane data stream between the target base station and the peer base station without forwarding the user plane data stream through other network elements, thereby reducing the transmission bandwidth occupation, saving transmission resources, and reducing the communication process. Transmission delay.
  • FIG. 7 is a schematic structural diagram of an embodiment of a mobile station switching system according to the present invention.
  • the embodiment includes: a first base station controller 71 and a second base station controller 72.
  • the first base station controller 71 is a source base station controller of the mobile station that initiates handover between the base station controllers
  • the second base station controller 72 is a target base station controller that initiates handover of the mobile station across the base station controller, where the first base station controls
  • the controller 71 can refer to the source base station controller described in the corresponding embodiment of FIG. 4, and the second base station controller 72 can refer to the target base station controller described in the embodiment of FIG. 5 or FIG. 6.

Landscapes

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

Abstract

本发明提供一种移动台切换方法、设备和系统。该方法包括：本端移动台与对端移动台通话过程中，源基站控制器通过核心网向目标基站控制器发送包括第一通知信息的切换请求；接收目标基站控制器通过核心网发送的包括有第二通知信息的第一切换命令；第二通知信息包括目标基站控制器的信令点、目标基站的IP传输层地址和目标基站与对端基站之间能够直接传递用户面数据流的指示信息；向对端基站控制器发送包括第二通知信息的第一双发指示，通过对端基站控制器指示对端基站与源基站直接传递用户面数据流，并与目标基站直接传递用户面数据流；向本端移动台发送切换命令。本发明减少了传输带宽占用，节省了传输资源，降低了通信过程中的传输时延。

Description

移动台切换方法、 设备和系统
本申请要求于 2011 年 12 月 22 日提交中国专利局、 申请号为 201110434890.3、 发明名称为 "移动台切换方法、 设备和系统" 的中国专利 申请的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明实施例涉及通信技术， 尤其涉及一种移动台切换方法、 设备和系 统。 背景技术
基站子系统（ Base Station Subsystem, 筒称 BSS )本地交换分为基站控制 器 （Base Station Controller, 筒称 BSC ) 本地交换和基站 （Base Transceiver Station 筒称 BTS )本地交换。 BSC本地交换是指当一对语音呼叫建立时， 如 果检测到主被叫双方由同一个 BSC覆盖， 就将呼叫信号在 BSC内部建立环回， 只保留移动交换中心 （Mobile Switching Center, 筒称 MSC ) 的信令链路， 释放占用的 A/Ater接口资源和语音编解码（ Transcoder, 筒称 TC )资源。 BTS 本地交换是指当一对语音呼叫建立时， 如果检测到主被叫双方由同一个 BTS 或 BTS组覆盖，将呼叫信号在 BTS或 BTS组建立环回，只保留 MSC的信令链路， 释放占用的 A/Ater接口资源、 Abis接口资源和 TC资源。
3GPP提供的本地交换 ( Local Call Local Switch, 筒称 LCLS ) 方案， 在 实现本地交换的同时， 还实现了对合法监听和补充业务的支持。 根据现有技 术中的本地交换方案， 本端移动台 （Mobile station, 筒称 MS )与对端移动台 的呼叫过程中， 如果 MS从源 BTS切换到目标 BTS后， 如果目标 BTS与对端的 BTS属于同一个 BSC, 则目标 BTS与对端的 BTS可以建立本地交换， 即目标 BTS与对端 BTS可以直接传递用户面数据流； 如果目标 BTS与对端 BTS属于不 同的 BSC, 则目标 BTS与对端 BTS之间不能建立本地交换，从而占用较多的传 输资源， 提高了传输时延。 发明内容
本发明实施例提供一种移动台切换的方法及设备， 以节省传输资源， 降 低传输时延。
一方面， 提供一种移动台切换方法， 包括：
在本端移动台与对端移动台通话过程中， 源基站控制器通过核心网向目 标基站控制器发送包括第一通知信息的切换请求， 所述第一通知信息包括对 端基站控制器的信令点、 对端基站的 IP传输层地址、 所述本端移动台切换前 使用的语音编码和切换前源基站与对端基站是否直接传递用户面数据流的指 示信息；
所述源基站控制器接收所述目标基站控制器通过所述核心网发送的包括 有第二通知信息的第一切换命令； 所述第二通知信息包括所述目标基站控制 器的信令点、所述目标基站的 IP传输层地址和所述目标基站与所述对端基站 之间能够直接传递用户面数据流的指示信息；
所述源基站控制器向对端基站控制器发送包括所述第二通知信息的第一 双发指示， 通过所述对端基站控制器指示所述对端基站与所述源基站直接传 递用户面数据流， 并根据所述第二通知信息与所述目标基站直接传递用户面 数据流； 所述源基站控制器向所述本端移动台发送切换命令。
另一方面， 提供一种源基站控制器， 包括：
发送模块， 用于在本端移动台与对端移动台通话过程中， 通过核心网向 目标基站控制器发送包括第一通知信息的切换请求， 所述第一通知信息包括 对端基站控制器的信令点、 对端基站的 IP传输层地址、 所述本端移动台切换 前使用的语音编码和切换前源基站与对端基站是否直接传递用户面数据流的 指示信息；
接收模块， 用于接收所述目标基站控制器通过所述核心网发送的包括有 第二通知信息的第一切换命令； 所述第二通知信息包括所述目标基站控制器 的信令点、所述目标基站的 IP传输层地址和所述目标基站与所述对端基站之 间能够直接传递用户面数据流的指示信息；
切换处理模块， 用于向对端基站控制器发送包括所述第二通知信息的第 一双发指示， 通过所述对端基站控制器指示所述对端基站与所述源基站直接 传递用户面数据流， 并根据所述第二通知信息与所述目标基站直接传递用户 面数据流； 所述源基站控制器向所述本端移动台发送切换命令。
另一方面， 提供一种移动台切换方法， 包括：
在本端移动台与对端移动台通话过程中， 目标基站控制器接收源基站控 制器通过核心网发送的包括有第一通知信息的切换请求， 所述第一通知信息 包括对端基站控制器的信令点、 对端基站的 IP传输层地址、 所述本端移动台 切换前使用的语音编码和切换前源基站与对端基站是否直接传递用户面数据 流的指示信息；
所述目标基站控制器为所述目标基站分配 IP传输层地址， 若根据所述第 一通知信息确定所述本端移动台切换前源基站与对端基站直接传递用户面数 据流、 所述本端移动台切换后使用的语音编码与切换前使用的语音编码相同 且确定所述目标基站与所述对端基站之间路由可达时， 所述目标基站控制器 通过所述核心网向所述源基站控制器发送包括第二通知信息的第一切换命 令； 所述第二通知信息包括所述目标基站控制器的信令点、 所述目标基站的
IP传输层地址和所述目标基站与所述对端基站之间能够直接传递用户面数据 流的指示信息。
另一方面， 还提供一种目标基站控制器， 包括：
接收模块， 用于在本端移动台与对端移动台通话过程中， 接收源基站控 制器通过核心网发送的包括有第一通知信息的切换请求， 所述第一通知信息 包括对端基站控制器的信令点、 对端基站的 IP传输层地址、 所述本端移动台 切换前使用的语音编码和切换前源基站与对端基站是否直接传递用户面数据 流的指示信息；
切换处理模块， 用于为所述目标基站分配 IP传输层地址， 若根据所述第 一通知信息确定所述本端移动台切换前源基站与对端基站直接传递用户面数 据流、 所述本端移动台切换后使用的语音编码与切换前使用的语音编码相同 且确定所述目标基站与所述对端基站之间路由可达时， 通过所述核心网向所 述源基站控制器发送包括第二通知信息的第一切换命令； 所述第二通知信息 包括所述目标基站控制器的信令点、所述目标基站的 IP传输层地址和所述目 标基站与所述对端基站之间能够直接传递用户面数据流的指示信息。
再一方面， 还提供一种移动台切换系统， 包括： 第一基站控制器和第二 基站控制器； 其中， 第一基站控制器为上述源基站控制器， 第二基站控制器 为上述目标基站控制器。
本发明实施例提供的技术方案， 当本端移动台在与对端移动台通话过程 中发起跨基站控制器的切换后， 切换后的目标基站与对端基站能相互获知对 方的 IP传输层地址， 进而利用 IP传输网的路由功能在目标基站与对端基站 间直接传递用户面数据流， 而不需要通过其它网元转发用户面数据流， 从而 减少了传输带宽占用， 节省了传输资源， 降低了通信过程中的传输时延。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作一筒单地介绍， 显而易见地， 下 面描述中的附图是本发明的一些实施例， 对于本领域普通技术人员来讲， 在 不付出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。
图 1A为本发明提供的移动台切换方法实施例一流程图；
图 1B为本发明提供的移动台切换方法实施例二流程图；
图 1C为本发明提供的移动台切换方法实施例三流程图；
图 2为本发明提供的移动台切换方法实施例四流程图；
图 3为本发明移动台切换方法实施例五流程图；
图 4为本发明提供的源基站控制器实施例结构示意图；
图 5为本发明提供的目标基站控制器实施例一结构示意图；
图 6为本发明提供的目标基站控制器实施例二结构示意图；
图 7为本发明提供的移动台切换系统实施例结构示意图。 具体实施方式
为使本发明实施例的目标、 技术方案和优点更加清楚， 下面将结合本发 明实施例中的附图， 对本发明实施例中的技术方案进行清楚、 完整地描述， 显然， 所描述的实施例是本发明一部分实施例， 而不是全部的实施例。 基于 本发明中的实施例， 本领域普通技术人员在没有付出创造性劳动前提下所获 得的所有其他实施例， 都属于本发明保护的范围。
本发明实施例中，源基站为发起切换的本端移动台在切换前所属的基站， 源基站控制器为源基站所属的基站控制器， 目标基站为本端移动台切换后所 属的基站， 目标基站控制器为目标基站所属的基站控制器， 对端基站为与本 端移动台通信的对端移动台所属的基站， 对端基站控制器为对端基站所属的 基站控制器。 进一步的， 核心网部分， 例如， 源移动交换中心为所述源基站 控制器所属的移动交换中心， 目标移动交换中心为目标基站控制器所属的移 动交换中心， 对端移动交换中心为对端基站控制器所属的移动交换中心。 其 中， 本发明实施例可以适用于各种通信系统， 例如， 基站可为 2G 网络中的 BTS, 基站控制器可为 2G网络中的 BSC; 又例如， 基站也可为 3G网络中的 NodeB, 基站控制器也可为 3G 网络中的无线网络控制器 （Radio Network Controller, 筒称 RNC ) 。
需要说明的是， 本发明实施例中源基站控制器、 目标基站控制器和对端 基站控制器分别为逻辑上不同的基站控制器， 它们在物理上可以是一个基站 控制器， 也可以是独立分开的基站控制器。 同样的， 目标移动交换中心、 源 移动交换中心和对端移动交换中心分别为逻辑上不同的移动交换中心， 它们 在物理上可以是一个移动交换中心， 也可以是独立的移动交换中心。
图 1A 为本发明提供的移动台切换方法实施例一流程图。 本实施例主要 从本端移动台切换前所属的源基站控制器角度， 说明本端移动台与对端移动 台通信时， 在本端移动台发起跨基站控制器间切换过程中， 如何使得切换后 的目标基站与对端基站实现用户面数据流的直接传递。 本实施例可适用于源 基站控制器和目标基站控制器属于同一个 MSC的场景，也适用于源基站控制 器和目标基站控制器不属于同一个 MSC的场景。 如图 1A所示， 本实施例包 括：
步骤 11: 在本端移动台与对端移动台通话过程中， 源基站控制器通过核 心网向目标基站控制器发送包括第一通知信息的切换请求， 第一通知信息包 括对端基站控制器的信令点、 对端基站的 IP传输层地址、 本端移动台切换前 使用的语音编码和切换前源基站与对端基站是否直接传递用户面数据流的指 示信息。
具体来说， 在本端移动台与对端对端移动台通话过程中， 源基站控制器 可以根据本端移动台发送的测量报告确定本端移动台是否需要进行在不同的 基站控制器之间的切换， 如果是， 源基站控制器可以通过核心网向目标基站 控制器发送包括第一通知信息的切换请求， 例如， 源基站控制器可以向源移 动交换中心发送切换要求（ Handover Required ) 消息， 源移动交换中心接收 到源基站控制器的切换要求消息后， 通过目标移动交换中心向目标基站控制 器发送切换请求（Handover Request )消息。 所述切换请求消息与切换要求消 息均包含所述第一通知信息。 其中， 所述第一通知信息中的 IP传输层地址可 以为 IP地址和 UDP端口号， 所述对端基站控制器的信令点可以相当于对端 基站控制器的标识。
步骤 12: 源基站控制器接收目标基站控制器通过核心网发送的包括有第 二通知信息的第一切换命令； 第二通知信息包括目标基站控制器的信令点、 目标基站的 IP传输层地址和目标基站与对端基站之间能够直接传递用户面数 据流的指示信息。
具体来说， 例如， 目标基站控制器接收到目标移动交换中心的切换要求 消息后，可以在为目标基站分配新信道的同时为目标基站分配 IP传输层地址。 如果目标基站控制器确定移动台切换前源基站与对端基站直接传递用户面数 据流、 本端移动台切换后使用的语音编码与切换前使用的语音编码相同且目 标基站与对端基站之间路由可达， 确定对端基站与目标基站之间能够建立网 状连接（Mesh connecting, 筒称 MESH连接） ， 即目标基站与对端基站能够 通过 IP传输网的路由功能直接传递用户面数据流， 而不需要通过其它网元转 发用户面数据流。 则目标基站控制器通过核心网向源基站控制器发送包括有 第二通知信息的第一切换命令， 例如， 目标基站控制器可以向目标移动交换 中心发送第一切换请求应答消息， 目标移动交换中心收到所述第一切换请求 应答消息后， 通过源移动交换中心向源基站控制器发送第一切换命令。 所述 第一切换请求应答消息和第一切换命令均包含有第二通知信息。
步骤 13: 源基站控制器向对端基站控制器发送包括第二通知信息的第一 双发指示， 通过对端基站控制器指示对端基站与源基站直接传递用户面数据 流， 并根据第二通知信息与目标基站直接传递用户面数据流； 源基站控制器 向本端移动台发送切换命令。
具体来说， 例如， 接收到包括第二通知信息的第一切换命令后， 源基站 控制器通过与对端基站控制器之间的接口， 向对端基站控制器发送包括第二 通知信息的第一双发指示， 由对端基站控制器向对端基站转发第一双发指示 ( Mesh Handover Prepare ) 。 对端基站接收到第一双发指示后， 在与源基站 直接传递用户面数据流的同时， 对端基站还根据第二通知信息， 即目标基站 控制器的信令点和目标基站的 IP传输层地址， 与目标基站直接传递用户面数 据流。 至此， 本端移动台与对端移动台之间的用户面数据流在对端基站与源 基站之间直接传递时， 还在对端基站与目标基站之间的 MESH连接上直接传 递。
本发明实施例， 当本端移动台在与对端移动台通话过程中发起跨基站控 制器的切换后， 本端移动台切换后的目标基站与对端基站能相互获知对方的
IP传输层地址，进而利用 IP传输网的路由功能在目标基站与对端基站间直接 传递用户面数据流， 而不需要通过其它网元转发用户面数据流， 从而减少了 传输带宽占用， 节省了传输资源， 降低了通信过程中的传输时延。
图 1B为本发明提供的移动台切换方法实施例二流程图。 如图 1B所示， 步骤 11-13与图 1A实施例中的步骤 11-13的描述类似， 不再赘述。在步骤 13 之后， 可选的， 还可以包括步骤 14和步骤 15:
步骤 14: 本端移动台根据源基站控制器的切换命令接入目标信道后， 源 基站控制器接收核心网发送的第一清除命令。
具体来说， 例如， 源基站控制器接收到包括第二通知信息的第一切换命 令后， 还向本端移动台发送切换命令， 指示本端移动台接入目标信道。 在本 端移动台接入目标信道后， 目标基站控制器可以向目标移动交换中心发送第 一切换完成消息。 目标移动交换中心收到第一切换完成消息后， 通过源移动 交换中心向源基站控制器发送第一清除命令（Clear Command ) , 通知源基站 控制器本端移动台已成功接入目标信道。 第一清除命令还包括目标基站与对 端基站之间能直接传递用户面数据流的指示信息。
步骤 15: 源基站控制器释放本端移动台占用的资源， 并向对端基站控制 器发送第一双发取消指示， 通过对端基站控制器指示对端基站停止与源基站 直接传递用户面数据流。
具体来说， 源基站控制器获知本端移动台成功接入目标基站控制器的信 道后， 释放本端移动台占用的资源， 同时向对端基站控制器发送第一双发取 消指示， 通过对端基站控制器指示对端基站停止与源基站直接传递用户面数 据流。 至此， 本端移动台与对端移动之间的用户面数据流， 仅在对端 BTS与 目标 BTS之间直接传递。 进一步， 可选的， 在步骤 12中， 如果目标基站控制器根据第一通知信息 确定本端移动台切换前源基站与对端基站不直接传递用户面数据流、 或确定 本端移动台切换后使用的语音编码与切换前使用的语音编码不相同， 或确定 目标基站与对端基站之间路由不可达时， 即目标基站控制器确定目标基站与 对端基站不能够建立 MESH连接时， 源基站控制器接收目标基站控制器通过 核心网发送的包括有第三通知信息的第二切换命令， 第三通知信息中包括目 标基站与对端基站不能够建立 MESH连接， 即不能直接传递用户面数据流的 指示信息。 源基站控制器接收到第二切换命令后， 向本端移动台发送切换命 令， 同时向对端基站控制器发送第二双发指示， 第二双发指示包括目标基站 与对端基站之间不能够直接传递用户面数据流的指示信息。 对端基站控制器 将该第二双发指示转发给对端基站。 对端基站接收到第二双发指示后， 获知 目标基站与对端基站不直接传递用户面数据流， 按照第二双发指示与所述源 基站交互用户面数据流， 且与所述目标基站通过非直接传递方式交互用户面 数据流。 当本端移动台根据源基站控制器的切换命令接入目标信道后， 目标 基站控制器向核心网， 例如， 向目标移动交换中心发送第二切换完成消息， 之后目标移动交换中心通过源移动交换中心向源基站控制器发送第二清除命 令， 源基站控制器接收到第二清除命令后， 释放本端移动台占用的资源， 并 向对端基站控制器发送第二双发取消指示， 通过对端基站控制器向对端基站 指示停止与源基站交互用户面数据流。
图 1C为本发明提供的移动台切换方法实施例三流程图。本实施例主要从 移动台切换后所属的目标基站控制器角度， 说明本端移动台与对端移动台通 信时， 在本端移动台发起跨基站控制器间切换过程中， 切换后的目标基站与 对端基站如何实现用户面数据流的直接传递。 如图 1C所示， 本实施例包括： 步骤 21: 在本端移动台与对端移动台通话过程中， 目标基站控制器接收 源基站控制器通过核心网发送的包括有第一通知信息的切换请求， 第一通知 信息包括对端基站控制器的信令点、 对端基站的 IP传输层地址、 本端移动台 切换前使用的语音编码和切换前源基站与对端基站是否直接传递用户面数据 流的指示信息。
具体来说，源基站控制器可以向源移动交换中心发送切换要求（ Handover Required )消息， 源移动交换中心接收到源基站控制器的切换要求消息后， 通 过目标移动交换中心向目标基站控制器发送切换请求（ Handover Request )消 息。 所述切换请求消息与切换要求消息均包含所述第一通知信息。 其中， 所 述第一通知信息中的 IP传输层地址可以为 IP地址和 UDP端口号。
步骤 22: 目标基站控制器为目标基站分配 IP传输层地址，若根据第一通 知信息确定本端移动台切换前源基站与对端基站直接传递用户面数据流、 本 端移动台切换后使用的语音编码与切换前使用的语音编码相同且确定目标基 站与对端基站之间路由可达时， 目标基站控制器通过核心网向源基站控制器 发送包括第二通知信息的第一切换命令； 第二通知信息包括目标基站控制器 的信令点、 目标基站的 IP传输层地址和目标基站与对端基站之间能够直接传 递用户面数据流的指示信息。
具体来说， 目标基站控制器接收到目标移动交换中心的切换请求消息后， 为目标基站分配信道， 并为目标基站分配 IP传输层地址。 目标基站控制器通 过信道激活指示，将为目标基站分配的 IP传输层地址下发给目标基站。同时， 目标基站控制器根据第一通知消息， 判断本端移动台切换前源基站与对端基 站是否直接传递用户面数据流， 如果本端移动台切换前源基站与对端基站直 接传递用户面数据流， 则进一步判断本端移动台切换后使用的语音编码与切 换前使用的语音编码是否相同。 本端移动台切换后使用的语音编码， 为本端 移动台切换后与目标基站通信时使用的语音编码。 如果本端移动台切换后使 用的语音编码与切换前使用的语音编码相同， 目标基站控制器还在信道激活 指示中通知目标基站根据对端基站控制器的信令点和对端基站的 IP传输层地 址， 与对端基站进行路由可达性检测。 目标基站检测与对端基站之间的路由 是否可达， 向目标基站控制器返回信道激活确认时， 将路由可达性检测结果 通知给目标基站控制器。 目标基站控制器确定目标基站与对端基站之间路由 可达时， 在发送给核心网的第一切换要求应答中携带第二通知信息。 具体来 说， 目标基站控制器确定目标基站与对端基站之间路由可达时， 可以向目标 移动交换中心发送第一切换请求应答（ Handover Request Ack ) , 目标移动中 心通过源移动交换中心向源基站控制器发送第一切换命令 （ Handover Command ) 。 所述第一切换请求应答消息和第一切换命令均包含有第二通知 信息。
当本端移动台接入目标信道后， 目标基站控制器向核心网发送第一切换 完成消息， 第一切换完成消息包括目标基站与对端基站之间直接传递用户面 数据流的指示信息。 目标移动交换中心接收到第一切换完成消息后， 确定移 动台已成功接入目标基站控制器的信道， 目标移动交换中心通过源移动交换 中心向源基站控制器发送的第一清除命令， 以使源基站控制器释放本端移动 台占用的资源。 例如， 本端移动台接入目标信道后， 目标基站控制器向目标 移动交换中心发送第一切换完成（ Handover Complete ) 消息， 源移动交换中 心向源基站控制器发送第一清除命令 ( Clear Command ) 。
进一步， 在目标基站控制器接收源基站控制器通过核心网发送的包括有 第一通知信息的切换请求消息之后， 若目标基站控制器根据第一通知信息确 定本端移动台切换前源基站与对端基站不直接传递用户面数据流、 或确定本 端移动台切换后使用的语音编码与切换前使用的语音编码不相同， 或确定目 标基站与对端基站之间路由不可达时， 目标基站控制器通过核心网向源基站 控制器发送第二切换命令 ( Handover Command )； 第二切换命令包括目标基 站与对端基站之间不能直接传递用户面数据流的指示信息。 第二切换命令还 可包括目标基站控制器的信令点和目标基站的 IP传输层地址。 当本端移动台 接入目标信道后， 目标基站控制器向核心网发送第二切换完成 （ Handover Complete ) 消息， 第二切换完成消息包括目标基站与对端基站之间不能直接 传递用户面数据流的指示信息。 目标移动交换中心接收到第二切换完成消息 后， 确定移动台已成功接入目标基站控制器的信道， 目标移动交换中心通过 源移动交换中心向源基站控制器发送的第二清除命令（Clear Command ) , 以 使源基站控制器释放本端移动台占用的资源。 第二清除命令还包括目标基站 与对端基站之间不能直接传递用户面数据流的指示信息。
本发明实施例， 当本端移动台在与对端移动台通话过程中发起跨基站控 制器的切换后， 本端移动台切换后的目标基站与对端基站能相互获知对方的 IP传输层地址，进而利用 IP传输网的路由功能在目标基站与对端基站间直接 传递用户面数据流， 而不需要通过其它网元转发用户面数据流， 从而减少了 传输带宽占用， 节省了传输资源， 降低了通信过程中的传输时延。
图 2 为本发明提供的移动台切换方法实施例四流程图。 本实施例以 2G 网络中的 BTS和 BSC为例， 说明移动台切换方法。 BTS与 BSC之间通信接 口称为 Abis接口， Abis接口 IP化后称为 IP Abis接口， 本实施例适用于 Abis over IP场景。
本实施例中 MSI切换前所属的源基站为 BTS1 , BTS1所属的基站控制器 为 BSC1 , BSC1所属的 MSC为 MSCl; MS1切换后所属的目标基站为 BTS2, BTS2所属的基站控制器为 BSC2, BSC2所属的 MSC为 MSC2, BSC2通过 MSW ( Media Gate Way, 媒体网关） 2与 MSC2连接； 对端 MS2所属的 BTS 为 tBTS, tBTS所属的 BSC为 tBSC, tBSC所属的 MSC为 tMSC, tBSC通过 tMGW与 tMSC连接。 MSI从 BSC1切换到 BSC2, tBSC与 BSC2属于不同 的 MSC, BSC1与 BSC2也属于不同的 MSC。
本实施例中 MS1与对端 MS2在通信过程中， MS1发起跨 BSC切换， MS1 切换后所属的 BTS2与对端 MS2所属的 tBTS, 能直接传递用户面数据流。本 实施例主要以 MS1切换后 BSC2与 tBTS属于不同的 MSC, BSC1与 BSC2 也属于不同的 MSC为例说明，对于 BSC1与 BSC2属于同一个 MSC的场景， 与本实施例的区别在于， BSC1与 BSC2之间的信息不需要通过核心网转发。 如图 2所示， 本实施例包括：
步骤 la: MSI向 BTS1发送测量报告。
步骤 2a: BTS1向 BSC1发送预处理结果。
MS1与 MS2进行通话过程， MS1测量当前所在小区的信号质量并向所 属的源基站 BTS1发送测量报告。 BTS1接收到 MS1的测量报告后， 向所属 的 BSC1发送预处理结果。 例如， MS1向 BTS1发送 Measurement Report消 息， BTS 1向 BSC1发送 Pre_measurment Result消息。 MS2所属的 BSC为 tBSC , tBSC所属的 MSC为 tMSC。
步骤 3a: BSC1向 MSCl发送切换要求消息，切换要求消息包括 tBSC的 信令点， tBTS 的 IP传输层地址、 MS1在切换前采用的 Speech Codec和 MSI 在切换前 MESH连接状态。
BSC1 根据测量报告确定 MS1 需要进行跨 BSC 切换时， 向所属的
MSC1发送切换要求消息， 并在切换要求消息中携带 tBTS的 IP传输层地 址、 tBSC的信令点和 MS1在切换前 MESH连接状态。 MS1在切换前 MESH 连接状态表示 MS1切换前 BTS1与 tBTS是否直接传递用户面数据流。
例如， BSC1 向 MSC1 发送 Handover Required 消息， 该 Handover Required 消息中包括本发明实施例提供的信元： Old BSS to New BSS Information。 如表 1所示本发明实施例提供的信元 Old BSS to New BSS Information 中 包括： BSC Signalling Code 、 Mesh Transport Layer Address(BTS), Used Speech Codec和 Mesh Connect Result。 其中， BSC Signalling Code为对端 MS所属的 BSC的信令点， Mesh Transport Layer Address( BTS )为对端 MS所属的 BTS的 IP传输层地址， Used Speech Codec 是 MSI在切换前采用的 Speech Codec, Mesh Connect Result是 MS在切换 前的 Mesh连接状态。 表 1中除带 "*"号的索引外， 表中索引 （Reference ) 均指 3GPPTS48.008中的章节。
表 1为 Old BSS to New BSS Information
Figure imgf000014_0001
其中， BSC Signalling Code用于标识 BSC的信令点， 用二进制数表示 10 进制的信令点如表 2所示。
表 2为 BSC Signalling Code
Element identifier
Length
Signalling Code
本实施例中， BSC1向 MSC1发送的 Old BSS to New BSS Information包 括： tBSC的信令点、 tBTS 的 IP传输层地址、 MSI在切换前采用的 Speech Codec和 MSI在切换前的 Mesh连接状态。
步骤 4a: 核心网向 BSC2发出切换请求消息， 切换请求消息包括 tBSC 的信令点、 MS1在切换前 MESH连接状态、 tBTS 的 IP传输层地址和 MS1 在切换前采用的 Speech Codec。
BSC1的切换请求到达 MSC2后， MSC2向 BSC2发送切换请求消息。 例 如， MSC1 向 MSC2发送 Map Prepare HO Request, MSC2向 BSC2发送 Handover Request消息， Handover Request消息包括信元 Old BSS to New BSS Information, Old BSS to New BSS Information包括： tBSC的信令点、 tBTS 的 IP传输层地址和 MSI在切换前采用的 Speech Codec。 Old BSS to New BSS Information还包括 MSI在切换前的 Mesh连接^夫态。
步骤 5a: BSC2为 BTS2分配新信道和 IP的传输层地址， 向 BTS2发送 信道激活指示； 确定 MS1在切换前 Mesh连接已建立且 MS1切换前使用的 Speech Codec与 MS 1切换后采用的 Speech Codec相同时，通知 BTS2与 tBTS 进行路由可达性检测。
BSC2根据切换请求消息中 MS1在切换前的 Mesh连接状态， 确定 MS1 在切换前 Mesh连接已建立即 BTS1与 tBTS直接传递用户面数据流， 并确定 MS1切换前使用的 Speech Codec与 MSI切换后采用的 Speech Codec相同， 通知 BTS2与 tBTS进行路由可达性检测。
步骤 6a: BTS2与 tBTS进行路由可达性检测。
BTS2根据 tBSC的信令点、 tBTS 的 IP传输层地址和 BTS2的 IP传输层 地址， 与 tBTS进行路由可达性检测。
步骤 7a: BTS2向 BSC2发送包括路由可达性检测结果的信道激活确认。 例如， BSC2向 BTS2发送 Channel Activation消息后， 之后接收到 BTS2 的 Channel Activation Ack消息， Channel Activation Ack消息中包括 BTS2与 tBTS进行路由可达性检测后的检测结果。
步骤 8a: BSC2根据 BTS2的路由可达性检测结果确定 tBTS与 BTS2之 间路由可达时， 向 MSC2发送第一切换请求应答， 第一切换请求应答包括 BSC2的信令点和 BTS2的 IP传输层地址和 BTS2与 tBTS之间能建立 MESH 连接的指示信息。
如果 BSC2根据 BTS2的路由可达性检测结果确定 tBTS与 BTS2路由可 达时， 确定 BTS2与 tBTS之间能建立 MESH连接， 通过第一切换请求应答 向 tBSC通知 BSC2的信令点和 BTS2的 IP传输层地址和 BTS2与 tBTS之间 能建立 MESH连接的指示信息。 例如， BSC2向 MSC2发送 Handover Request Ack 消息，该 Handover Request Ack 消息扩展有新信元： New BSS to Old BSS Information„
如表 3所示本发明实施例提供的信元 New BSS to Old BSS Information 包括： BSC Signaling Code ^ Mesh Transport Layer Address和 Selected Speech Codec。 其中， 是 MS切换后所在的 BSC的信令点， Mesh Transport Layer Address是 MS切换后所在的 BTS的 IP传输层地址， Selected Speech Codec 是 MS切换后采用的 Speech Codec。表 3中除带 "*"号的索引外，表中索引 ( Reference ) 均指 3GPPTS48.008中的章节。
表 3为 New BSS to Old BSS Information信元
Figure imgf000016_0001
本实施例中， Handover Request Ack 消息中 New BSS to Old BSS Information包括： BSC2的信令点、 BTS2的 IP传输层地址和 Mesh Control Indicator其中， Mesh Control Indicator表示 BTS2与 tBTS之间能建立 MESH 连接。
步骤 9a: 核心网向 BSC1下发第一切换命令， 第一切换命令包括 BSC2 的信令点、 BTS2的 IP传输层地址和 BTS2与 tBTS之间能建立 MESH连接的 指示信息。
例如， MSC2向 MSC1发送 Map Prepare HO Response消息， MSC1向 BSC1 发送 Handover Command消息, 该 Handover Command消息包括新信元： New BSS to Old BSS Information New BSS to Old BSS Information包括： BSC2 的信令点、 BTS2的 IP传输层地址和 Mesh Control Indicato 其中， Mesh Control Indicator表示 BTS2与 tBTS之间能建立 MESH连接。
步骤 10a: BSC1向 tBSC发送第一双发指示， 指示 tBTS与 BTS1直接传 递用户面数据流，并与 BTS2直接传递用户面数据流，第一双发指示包括 BSC2 的信令点、 BTS2的 IP传输层地址和 BTS2与 tBTS之间能建立 MESH连接的 指示信息。
例如， BSC1向 tBSC发送 Mesh Handover Prepare消息。 表 4为本发明实 施例提供的 Mesh Handover Prepare消息。 如表 4所示， 除带" *"号的索引外， 表 4中索引 （Reference ) 均指 3GPPTS48.008中的章节。 建议 Message Type 的取值为： 0111 1001。 Mesh Control Indicator用于通知对端 BSC: MS切换 后是否能建立 Mesh连接； BSC Signalling Code用于通知对端 BSC: MS切换 后所在的目标 BSC的信令点； Mesh Transport Layer Address(BTS)用于通知对 端 BSC: MS切换后所在的目标 BTS的 IP传输层地址。
表 4为 Mesh Handover Prepare消息
Figure imgf000017_0001
本实施例中， Mesh Handover Prepare消息中包括 BSC2的信令点、 BTS2 的 IP传输层地址和 BTS2与 tBTS之间能建立 MESH连接的指示信息。
步骤 11a: tBSC向 tBTS发送第一双发指示。 第一双发指示包括 BSC2 的信令点、 BTS2的 IP传输层地址以及 BTS2与 tBTS之间能建立 MESH连接 的指示信息。
根据 tBSC的第一双发指示， 在 tBTS与 BTS1直接传递用户面数据流， 并通过 BTS2的 IP传输层地址 IP传输网的路由功能直接向与 BTS2直接传递 用户面数据流。
步骤 12a: BSC1通过 BTS1向 MS1发送切换命令。
例如， BSC1向 BTS1发送 Handover Command指示 MSI接入 BSC2分配 的新信道。
步骤 13a: MSI根据 BSC1的切换命令接入目标信道。
步骤 14a: BSC2确定 MS1接入目标信道后， 向 MSC2发送第一切换成 功确认。
进一步， BSC2发送的第一切换完成消息还可包括 MS1 切换后已建立 MESH连接的指示信息和 BTS2的 IP传输层地址，以使 BSC1将 MS1切换后 已建立 MESH连接的指示信息和 BTS2的 IP传输层地址传递给 tBSC后， tBSC 对 BTS2的 IP传输层地址进行确认， 并对 MS1切换后 tBTS与 BTS2之间的 MESH连接状态进行确认。
例如， BSC2 向 MSC2发送 Handover Complete消息。 Handover Complete 消息中内容如表 5所示。本发明实施例中 Handover Complete消息扩展的信元 包括 Mesh Connect Result和 Transport Layer Address(BTS)。 Mesh Connect Result为 MS切换后的 MESH连接^ 态； Mesh Transport Layer Address(BTS) 为 BTS的 IP传输层地址。 本实施例中， Mesh Connect Result表示 MSI切换 后已建立 MESH连接， 即 BTS2与 tBTS之间已建立 MESH连接， Transport Layer Address(BTS)为 BTS2的 IP传输层地址。
表 5中除带 "*"号的索引外， 表中索引 （Reference ) 均指 3GPPTS48.008 中的章节。 如表 5所示， Message Type为消息类型； Talker Priority为通话优 先级； Codec List (BSS Supported)为 BSS 支持的 Codec 列表； Chosen Encryption Algorithm为同步算法； Chosen Channel为 MSI分配的信道； Speech Codec (Chosen)为 MSI切换后采用的 Speech Codec。
步骤 15a: 核心网向 BSC1发送第一清除命令。
例如， MSC2向 MSC1发送 Map Send End Signal Request (HO Complete) 消息， MSC1向 BSC1发送表 6所示的 Clear Command消息，表 6所示， Message Type为消息类型； Mesh Connect Result为 MS切换后的 MESH连接状态。 表 6中除带 "*"号的索引外， 表中索引 （Reference ) 均指 3GPPTS48.008中的 早 。
本实施例中 Clear Command消息包括 MS1切换后已建立 MESH连接的 指示信息和 BTS2的 IP传输层地址。
表 5为 Handover Complete消息
Figure imgf000018_0001
表 6为 Clear Command消息 INFORMATION ELEMENT REFERENCE DIRECTION TYPE LEN
(notel)
(交互的网元）
Message Type 3.2.2.1 MSC-BSS M 1
Layer 3 Header Information 3.2.2.9 MSC-BSS 0 4
Cause 3.2.2.5 MSC-BSS M 3-4
Mesh Connect Result * MSC-BSS C(note2) 2 步骤 16a: BSC1释放 MSI占用的资源，向 tBSC发送第一双发取消指示， 指示 tBTS停止与 BTS1直接传递用户面数据流。
BSC1接收到核心网下发的第一清除命令后， 释放 MS1 占用的资源， 并 向 tBSC发送第一双发取消指示。
进一步， 第一清除命令还可包括 MS1切换后已建立 MESH连接的指示 信息和 BTS2的 IP传输层地址时，第一双发取消指示还可包括 MS1切换后已 建立 MESH连接的指示信息和 BTS2的 IP传输层地址。 tBTS可通过第一双 发取消指示确认 BTS2的 IP传输层地址， 并确认 MS1切换后已建立 MESH 连接。
例如， BSC1向 tBSC发送 Mesh Handover Complete消息， 如表 7所示， 本发明实施例提供的 Mesh Handover Complete消息包括 Message Type和 Mesh Connect Result。 除带 "*"号的索引外， 表 7 中索引 ( Reference ) 均指 3GPPTS48.008 中的章节。 建议 Message Type的取值为： 0111 1010。 Mesh Connect Result用于通知对端 BSS, 切换后 Mesh连接是否建立。 本实施例中 该 Mesh Handover Complete消息包括 MS 1切换后已建立 MESH连接的指示 信息和 BTS2的 IP传输层地址。
表 7 为 Mesh Handover Complete消息
Figure imgf000019_0001
步骤 17a: tBSC向 tBTS发送第一双发取消指示。
tBTS收到双发取消指示后，与 BTS1停止交互用户面数据流。此后， MS1 与 MS2之间的用户面数据流， 在 tBTS与 BTS2之间直接传递。
图 3为本发明提供的移动台切换方法实施例五流程图。 本实施例中本端 MS1与对端 MS2在通信过程中， MS1发起跨 BSC切换， MS1切换后所属的 BTS2与对端 MS2所属的 tBTS之间不能建立 MESH连接， 即不能直接传递 用户面数据流。 如图 3所示， 本实施例包括：
步骤 lb: MSI向 BTS1发送测量报告。
步骤 2b: BTS1向 BSC1发送预处理结果。
步骤 3b: BSC1 向 MSC1发送切换要求消息， 切换要求消息包括 tBSC 的信令点， tBTS 的 IP传输层地址、 MS1在切换前采用的 Speech Codec和 MSI 在切换前 MESH连接状态。
步骤 4b: 核心网向 BSC2发送切换请求消息， 切换请求消息包括 tBSC 的信令点、 MS1在切换前 MESH连接状态、 tBTS 的 IP传输层地址和 MS1 在切换前采用的 Speech Codec。
步骤 5b: BSC2为 BTS2分配新信道和 IP的传输层地址， 向 BTS2发送 信道激活指示， 确定 MS1在切换前 Mesh连接已建立且 MS1切换前使用的 Speech Codec与 MS 1切换后采用的 Speech Codec相同时，通知 BTS2与 tBTS 进行路由可达性检测。 Codec不一致时， 不通知 BTS2与 tBTS进行路由可达性检测。
步骤 6b: BTS2与 tBTS进行路由可达性检测。
步骤 7b: BTS2向 BSC2发送包括路由可达性检测结果的信道激活确认。 步骤 lb至步骤 7b, 与步骤 la至步骤 7a相同。
步骤 8b: BSC2根据 BTS2的路由可达性检测结果确定 tBTS与 BTS2之 间路由不可达时， 向 MSC2发送第二切换请求应答， 第二切换请求应答包括 BTS2与 tBTS之间不能建立 MESH连接的指示信息。
如果 tBTS与 BTS2之间路由不可达， tBTS与 BTS2之间不能建立 MESH 连接， BSC2向 MSC2发送第二切换请求应答。
进一步， 第二切换请求应答还可包括 MS1切换后使用的 Speech Codec。 步骤 9b: 核心网向 BSC1发送第二切换命令， 第二切换命令包括 BTS2 与 tBTS之间不能建立 MESH连接的指示信息。
进一步， 第二切换命令还可包括 MS1切换后使用的语音编码。
步骤 10b: BSC1向 tBSC发送第二双发指示， 第二双发指示包括 BTS2 与 tBTS之间不能建立 MESH连接的指示信息。 第二双发指示用于指示 tBTS 与 BTS1交互用户面数据流，并通过非直接传递方式向 BTS2交互用户面数据 Ί。
步骤 lib: tBSC向 tBTS发送第二双发指示。
tBTS接收到 tBSC的第二双发指示后， 在与 BTS2交互用户面数据流时， 并通过非直接传递方式与 BTS2交互用户面数据流。如果切换前 BTS1与 tBTS 建立 MESH连接， 则在 tBTS与 BTS1之间直接传递用户面数据流。 如果切 换前 BTS1与 tBTS没有建立 MESH连接，则通过非直接传递方式与 BTS2交 互用户面数据流。
进一步， 第二切换命令还可包括 MS1切换后使用的语音编码， 第二双发 指示还可包括 MS1切换后使用的语音编码。 tBTS接收到 tBSC的第二双发指 示后， 采用第二双发指示携带的 MS1切换后使用的语音编码， 与 BTS2交互 用户面数据流。
步骤 12b: BSC1通过 BTS1向 MS1发送切换命令。
步骤 13b: MSI根据 BSC1的切换命令接入目标信道。
步骤 14b: BSC2确定 MS1接入目标信道后， 向 MSC2发送第二切换完 成消息。
进一步，第二切换完成消息还可包括 BTS2与 tBTS之间不能建立 MESH 连接的指示信息， 以使 tBTS收到第二双发取消指示后， 确认 BTS2与 tBTS 之间不能建立 MESH连接。
步骤 15b: 核心网向 BSC1发送第二清除命令。
步骤 16b: BSC1释放 MSI占用的资源，向 tBSC发送第二双发取消指示， 以指示 tBTS停止向 BTS1发送用户面数据流， 第二双发取消指示包括 tBTS 和 BTS2之间不能建立 MESH连接的指示信息。
步骤 17b: tBSC向 tBTS发送第二双发取消指示。
进一步， 第二清除命令还可包括 BTS2与 tBTS之间不建立 MESH连接 的指示信息，第二双发取消指示还可包括 BTS2与 tBTS之间不能建立 MESH 连接的指示信息。
tBTS收到第二双发取消指示后停止与 BTS1交互用户面数据流。 此后， tBTS和 BTS2通过非直接传递方式交互 MS1与 MS2之间的用户面数据流。
步骤 18b: 若 MS1切换后 MESH连接状态发生变化， tBSC向 tMSC发 送通知消息， 通知 tMSC在 MS1切换后 MESH连接状态改变。 tBSC接收到第二双发取消指示息后， 确认 MS1切换后不能建立 MESH 连接， 如果 MS1切换前建立 MESH连接， 则 tBSC向 tMSC发送通知消息， 例如向 tMSC发送 Mesh Connect Report消息，通知 tMSC在 MSI切换后不能 建立 MESH连接。
例如 tBSC向 tMSC发送如表 8所示的 Mesh Connect Report消息， 通过
Mesh Connect Report消息中 Mesh Connect Result, 通知 tMSC在 MSI切换后 已建立 MESH 连接。 除带" *"号的索引外， 表 8 中索引 （Reference ) 均指 3GPPTS48.008中的章节。 建议 Message Type的取值为： 0111 1010。
表 8为 Mesh Connect Report消息
Figure imgf000022_0001
本实施例中， BSC2确定 tBTS与 BTS2不能建立 MESH连接时，向 MSC2 发送第二切换要求应答， 第二切换要求应答中包括 tBTS与 BTS2不能建立 MESH连接的指示信息。
图 4为本发明提供的源基站控制器实施例结构示意图。 本实施例的源基 站控制器可为发起切换的移动台切换前所属的基站控制器。 如图 4所示， 本 实施例包括： 发送模块 41、 接收模块 42和切换处理模块 43。
发送模块 41 , 用于在本端移动台与对端移动台通话过程中， 通过核心网 向目标基站控制器发送包括第一通知信息的切换请求， 所述第一通知信息包 括对端基站控制器的信令点、 对端基站的 IP传输层地址、 所述本端移动台切 换前使用的语音编码和切换前源基站与对端基站是否直接传递用户面数据流 的指示信息。
接收模块 42, 用于接收所述目标基站控制器通过所述核心网发送的包括 有第二通知信息的第一切换命令； 所述第二通知信息包括所述目标基站控制 器的信令点、所述目标基站的 IP传输层地址和所述目标基站与所述对端基站 之间能够直接传递用户面数据流的指示信息。
切换处理模块 43, 用于向对端基站控制器发送包括所述第二通知信息的 第一双发指示， 通过所述对端基站控制器指示所述对端基站与所述源基站直 接传递用户面数据流， 并根据所述第二通知信息与所述目标基站直接传递用 户面数据流； 向所述本端移动台发送切换命令。 上述各模块实现的功能参见图 1A对应实施例中描述， 在此不再赘述。 在向本端移动台发送切换命令后， 接收模块 42, 还用于当所述本端移动 台根据所述源基站控制器的切换命令接入所述目标信道后， 接收所述核心网 发送的第一清除命令。 进一步， 所述第一清除命令还包括所述目标基站与所 述对端基站之间可直接传递用户面数据流的指示信息。所述切换处理模块 42, 还用于释放所述本端移动台占用的资源， 并向所述对端基站控制器发送第一 双发取消指示， 通过所述对端基站控制器指示所述对端基站停止与所述源基 站直接传递用户面数据流。
进一步， 目标基站与对端基站有可能不能建立 MESH连接， 此情况下源 基站控制器还可通过上述模块实现本端移动台切换。
接收模块 42, 还用于接收所述目标基站控制器通过所述核心网发送的第 二切换命令； 所述第二切换命令包括所述目标基站与所述对端基站之间不能 直接传递用户面数据流的指示信息。 进一步， 所述第二切换命令还包括所述 目标基站控制器的信令点和所述目标基站的 IP传输层地址。
所述切换处理模块 43 ,还用于向所述对端基站控制器发送第二双发指示， 通过所述对端基站控制器指示所述对端基站与所述源基站交互用户面数据 流， 且与所述目标基站通过非直接传递方式交互用户面数据流， 所述第二双 发指示包括所述目标基站与所述对端基站之间不能直接传递用户面数据流的 指示信息。
所述接收模块 42, 还用于当所述本端移动台根据所述源基站控制器的切 换命令接入所述目标信道后， 接收所述核心网发送的第二清除命令。 进一步， 所述第二清除命令还包括所述目标基站与所述对端基站之间不能直接传递用 户面数据流的指示信息。
所述切换处理模块 43 , 还用于释放所述移动台占用的资源， 并向所述对 端基站控制器发送第二双发取消指示， 通过所述对端基站控制器指示所述对 端基站停止与所述源基站交互用户面数据流。
上述各模块实现的功能参见图 1B和图 3对应实施例中描述，在此不再赘 述。
本发明实施例提供的技术方案， 当本端移动台在与对端移动台通话过程 中发起跨基站控制器的切换后， 切换后的目标基站与对端基站能相互获知对 方的 IP传输层地址， 进而利用 IP传输网的路由功能在目标基站与对端基站 间直接传递用户面数据流， 而不需要通过其它网元转发用户面数据流， 从而 减少了传输带宽占用， 节省了传输资源， 降低了通信过程中的传输时延。
图 5为本发明提供的目标基站控制器实施例一结构示意图。 本实施例的 目标基站控制器可为发起切换的移动台切换后所属的目标基站控制器。 如图 5所示， 本实施例包括： 接收模块 51和切换处理模块 52。
接收模块 51 , 用于在本端移动台与对端移动台通话过程中， 接收源基站 控制器通过核心网发送的包括有第一通知信息的切换请求， 所述第一通知信 息包括对端基站控制器的信令点、 对端基站的 IP传输层地址、 所述本端移动 台切换前使用的语音编码和切换前源基站与对端基站是否直接传递用户面数 据流的指示信息。
切换处理模块 52,用于为所述目标基站分配 IP传输层地址，若根据所述 第一通知信息确定所述本端移动台切换前源基站与对端基站直接传递用户面 数据流、 所述本端移动台切换后使用的语音编码与切换前使用的语音编码相 同且确定所述目标基站与所述对端基站之间路由可达时， 通过所述核心网向 所述源基站控制器发送包括第二通知信息的第一切换命令； 所述第二通知信 息包括所述目标基站控制器的信令点、所述目标基站的 IP传输层地址和所述 目标基站与所述对端基站之间能够直接传递用户面数据流的指示信息。
如图 6所示， 在图 5的基础上还包括： 发送模块 53。
发送模块 53, 用于当所述本端移动台接入所述目标信道后， 向所述核心 网发送第一切换完成消息， 所述第一切换完成消息包括所述目标基站与所述 对端基站之间直接传递用户面数据流的指示信息。
上述各模块实现的功能参见图 1C和图 2对应实施例中描述，在此不再赘 述。
进一步， 目标基站与对端基站有可能不能建立 MESH连接， 此情况下源 基站控制器还可通过上述模块实现本端移动台切换。
所述切换处理模块 52, 还用于若根据所述第一通知信息确定所述本端移 动台切换前源基站与对端基站不直接传递用户面数据流、 或确定所述本端移 动台切换后使用的语音编码与切换前使用的语音编码不相同， 或确定所述目 标基站与所述对端基站之间路由不可达时， 通过所述核心网向所述源基站控 制器发送第二切换命令； 所述第二切换命令包括所述目标基站与所述对端基 站之间不能直接传递用户面数据流的指示信息。
发送模块 53, 还用于当所述本端移动台接入所述目标信道后， 向所述核 心网发送第二切换完成消息， 所述第二切换完成消息包括所述目标基站与所 述对端基站之间不直接传递用户面数据流的指示信息。
上述各模块实现的功能参见图 1C和图 3对应实施例中描述，在此不再赘 述。
本发明实施例， 当本端移动台在与对端移动台通话过程中发起跨基站控 制器的切换后， 切换后的目标基站与对端基站能相互获知对方的 IP传输层地 址， 进而利用 IP传输网的路由功能在目标基站与对端基站间直接传递用户面 数据流， 而不需要通过其它网元转发用户面数据流， 从而减少了传输带宽占 用， 节省了传输资源， 降低了通信过程中的传输时延。
图 7为本发明提供的移动台切换系统实施例结构示意图。 如图 7所示， 本实施例包括： 第一基站控制器 71和第二基站控制器 72。 第一基站控制器 71 为发起跨基站控制器切换的移动台的源基站控制器， 第二基站控制器 72 为发起跨基站控制器切换的移动台的目标基站控制器， 其中， 第一基站控制 器 71可参见图 4对应实施例中描述的源基站控制器， 第二基站控制器 72可 参见图 5或图 6实施例中描述的目标基站控制器。
本发明实施例的设备、 系统执行移动台切换的功能及具体过程可以参考 前述方法实施例， 此处不再赞述。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机可读 取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述 的存储介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的介 质。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对其 限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通技术 人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修改， 或 者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不使相应技 术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权利要求
1、 一种移动台切换方法， 其特征在于， 包括：
在本端移动台与对端移动台通话过程中， 源基站控制器通过核心网向目 标基站控制器发送包括第一通知信息的切换请求， 所述第一通知信息包括对 端基站控制器的信令点、 对端基站的 IP传输层地址、 所述本端移动台切换前 使用的语音编码和切换前源基站与对端基站是否直接传递用户面数据流的指 示信息；
所述源基站控制器接收所述目标基站控制器通过所述核心网发送的包括 有第二通知信息的第一切换命令； 所述第二通知信息包括所述目标基站控制 器的信令点、所述目标基站的 IP传输层地址和所述目标基站与所述对端基站 之间能够直接传递用户面数据流的指示信息；
所述源基站控制器向对端基站控制器发送包括所述第二通知信息的第一 双发指示， 通过所述对端基站控制器指示所述对端基站与所述源基站直接传 递用户面数据流， 并根据所述第二通知信息与所述目标基站直接传递用户面 数据流； 所述源基站控制器向所述本端移动台发送切换命令。
2、 根据权利要求 1所述的方法， 其特征在于， 在所述源基站控制器向所 述本端移动台发送切换命令之后， 还包括：
当所述本端移动台根据所述源基站控制器的切换命令接入目标信道后， 所述源基站控制器接收所述核心网发送的第一清除命令；
所述源基站控制器释放所述本端移动台占用的资源， 并向所述对端基站 控制器发送第一双发取消指示， 通过所述对端基站控制器指示所述对端基站 停止与所述源基站直接传递用户面数据流。
3、 根据权利要求 1或 2所述的方法， 其特征在于， 在所述源基站控制器 通过核心网向目标基站控制器发送包括第一通知信息的切换请求之后， 所述 方法还包括：
所述源基站控制器接收所述目标基站控制器通过所述核心网发送的第二 切换命令； 所述第二切换命令包括所述目标基站与所述对端基站之间不能直 接传递用户面数据流的指示信息；
所述源基站控制器向所述对端基站控制器发送第二双发指示， 通过所述 对端基站控制器指示所述对端基站与所述源基站交互用户面数据流， 且与所 述目标基站通过非直接传递方式交互用户面数据流， 所述第二双发指示包括 所述目标基站与所述对端基站之间不能直接传递用户面数据流的指示信息； 当所述本端移动台根据所述源基站控制器的切换命令接入所述目标信道 后， 所述源基站控制器接收所述核心网发送的第二清除命令；
所述源基站控制器释放所述移动台占用的资源， 并向所述对端基站控制 器发送第二双发取消指示， 通过所述对端基站控制器指示所述对端基站停止 与所述源基站交互用户面数据流。
4、 根据权利要求 2所述的方法， 其特征在于， 所述第一清除命令还包括 所述目标基站与所述对端基站之间直接传递用户面数据流的指示信息。
5、 根据权利要求 3所述的方法， 其特征在于， 所述第二切换命令还包括 所述目标基站控制器的信令点和所述目标基站的 IP传输层地址。
6、 根据权利要求 3所述的方法， 其特征在于， 所述第二清除命令还包括 所述目标基站与所述对端基站之间不能直接传递用户面数据流的指示信息。
7、 一种移动台切换方法， 其特征在于， 包括：
在本端移动台与对端移动台通话过程中， 目标基站控制器接收源基站控 制器通过核心网发送的包括有第一通知信息的切换请求， 所述第一通知信息 包括对端基站控制器的信令点、 对端基站的 IP传输层地址、 所述本端移动台 切换前使用的语音编码和切换前源基站与对端基站是否直接传递用户面数据 流的指示信息；
所述目标基站控制器为所述目标基站分配 IP传输层地址， 若根据所述第 一通知信息确定所述本端移动台切换前源基站与对端基站直接传递用户面数 据流、 所述本端移动台切换后使用的语音编码与切换前使用的语音编码相同 且确定所述目标基站与所述对端基站之间路由可达时， 所述目标基站控制器 通过所述核心网向所述源基站控制器发送包括第二通知信息的第一切换命 令； 所述第二通知信息包括所述目标基站控制器的信令点、 所述目标基站的 IP传输层地址和所述目标基站与所述对端基站之间能够直接传递用户面数据 流的指示信息。
8、 根据权利要求 7所述的方法， 其特征在于， 当所述本端移动台接入 目标信道后， 所述目标基站控制器向所述核心网发送第一切换完成消息， 所 述第一切换完成消息包括所述目标基站与所述对端基站之间直接传递用户 面数据流的指示信息。
9、 根据权利要求 7所述的方法， 其特征在于， 在所述接收源基站控制器 通过核心网发送的包括有第一通知信息的切换请求之后， 所述方法还包括： 若根据所述第一通知信息确定所述本端移动台切换前源基站与对端基站 不直接传递用户面数据流、 或确定所述本端移动台切换后使用的语音编码与 切换前使用的语音编码不相同， 或确定所述目标基站与所述对端基站之间路 由不可达时， 所述目标基站控制器通过所述核心网向所述源基站控制器发送 第二切换命令； 所述第二切换命令包括所述目标基站与所述对端基站之间不 能直接传递用户面数据流的指示信息。
10、 根据权利要求 9所述的方法， 其特征在于， 当所述本端移动台接入 所述目标信道后，所述目标基站控制器向所述核心网发送第二切换完成消息， 所述第二切换完成消息包括所述目标基站与所述对端基站之间不直接传递用 户面数据流的指示信息。
11、 根据权利要求 9或 10所述的方法， 其特征在于， 所述第二切换命令 还包括所述目标基站控制器的信令点和所述目标基站的 IP传输层地址。
12、 一种源基站控制器， 其特征在于， 包括：
发送模块， 用于在本端移动台与对端移动台通话过程中， 通过核心网向 目标基站控制器发送包括第一通知信息的切换请求， 所述第一通知信息包括 对端基站控制器的信令点、 对端基站的 IP传输层地址、 所述本端移动台切换 前使用的语音编码和切换前源基站与对端基站是否直接传递用户面数据流的 指示信息；
接收模块， 用于接收所述目标基站控制器通过所述核心网发送的包括有 第二通知信息的第一切换命令； 所述第二通知信息包括所述目标基站控制器 的信令点、所述目标基站的 IP传输层地址和所述目标基站与所述对端基站之 间能够直接传递用户面数据流的指示信息；
切换处理模块， 用于向对端基站控制器发送包括所述第二通知信息的第 一双发指示， 通过所述对端基站控制器指示所述对端基站与所述源基站直接 传递用户面数据流， 并根据所述第二通知信息与所述目标基站直接传递用户 面数据流； 向所述本端移动台发送切换命令。
13、 根据权利要求 12所述的源基站控制器， 其特征在于： 所述接收模块， 还用于当所述本端移动台根据所述源基站控制器的切换 命令接入目标信道后， 接收所述核心网发送的第一清除命令；
所述切换处理模块， 还用于释放所述本端移动台占用的资源， 并向所述 对端基站控制器发送第一双发取消指示， 通过所述对端基站控制器指示所述 对端基站停止与所述源基站直接传递用户面数据流。
14、 根据权利要求 12或 13所述的源基站控制器， 其特征在于： 所述接收模块， 还用于接收所述目标基站控制器通过所述核心网发送的 第二切换命令； 所述第二切换命令包括所述目标基站与所述对端基站之间不 能直接传递用户面数据流的指示信息；
所述切换处理模块， 还用于向所述对端基站控制器发送第二双发指示， 通过所述对端基站控制器指示所述对端基站与所述源基站交互用户面数据 流， 且与所述目标基站通过非直接传递方式交互用户面数据流， 所述第二双 发指示包括所述目标基站与所述对端基站之间不能直接传递用户面数据流的 指示信息；
所述接收模块， 还用于当所述本端移动台根据所述源基站控制器的切换 命令接入所述目标信道后， 接收所述核心网发送的第二清除命令；
所述切换处理模块， 还用于释放所述移动台占用的资源， 并向所述对端 基站控制器发送第二双发取消指示， 通过所述对端基站控制器指示所述对端 基站停止与所述源基站交互用户面数据流。
15、 一种目标基站控制器， 其特征在于， 包括：
接收模块， 用于在本端移动台与对端移动台通话过程中， 接收源基站控 制器通过核心网发送的包括有第一通知信息的切换请求， 所述第一通知信息 包括对端基站控制器的信令点、 对端基站的 IP传输层地址、 所述本端移动台 切换前使用的语音编码和切换前源基站与对端基站是否直接传递用户面数据 流的指示信息；
切换处理模块， 用于为所述目标基站分配 IP传输层地址， 若根据所述第 一通知信息确定所述本端移动台切换前源基站与对端基站直接传递用户面数 据流、 所述本端移动台切换后使用的语音编码与切换前使用的语音编码相同 且确定所述目标基站与所述对端基站之间路由可达时， 通过所述核心网向所 述源基站控制器发送包括第二通知信息的第一切换命令； 所述第二通知信息 包括所述目标基站控制器的信令点、所述目标基站的 IP传输层地址和所述目 标基站与所述对端基站之间能够直接传递用户面数据流的指示信息。
16、 根据权利要求 15所述的目标基站控制器， 其特征在于， 还包括： 发送模块， 用于当所述本端移动台接入目标信道后， 向所述核心网发送 第一切换完成消息， 所述第一切换完成消息包括所述目标基站与所述对端基 站之间直接传递用户面数据流的指示信息。
17、 根据权利要求 15所述的目标基站控制器， 其特征在于：
所述切换处理模块， 还用于若根据所述第一通知信息确定所述本端移动 台切换前源基站与对端基站不直接传递用户面数据流、 或确定所述本端移动 台切换后使用的语音编码与切换前使用的语音编码不相同， 或确定所述目标 基站与所述对端基站之间路由不可达时， 通过所述核心网向所述源基站控制 器发送第二切换命令； 所述第二切换命令包括所述目标基站与所述对端基站 之间不能直接传递用户面数据流的指示信息。
18、 根据权利要求 17所述的目标基站控制器， 其特征在于， 所述发送模 块， 还用于当所述本端移动台接入所述目标信道后， 向所述核心网发送第二 切换完成消息， 所述第二切换完成消息包括所述目标基站与所述对端基站之 间不直接传递用户面数据流的指示信息。
19、 一种移动台切换系统， 其特征在于， 包括： 第一基站控制器和第二 基站控制器； 所述第一基站控制器为权利要求 12至 14任一所述的源基站控 制器，所述第二基站控制器为权利要求 15至 18任一所述的目标基站控制器。
PCT/CN2012/087223 2011-12-22 2012-12-22 移动台切换方法、设备和系统 WO2013091579A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110434890.3 2011-12-22
CN201110434890.3A CN102572980B (zh) 2011-12-22 2011-12-22 移动台切换方法、设备和系统

Publications (1)

Publication Number Publication Date
WO2013091579A1 true WO2013091579A1 (zh) 2013-06-27

Family

ID=46417162

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/087223 WO2013091579A1 (zh) 2011-12-22 2012-12-22 移动台切换方法、设备和系统

Country Status (2)

Country Link
CN (1) CN102572980B (zh)
WO (1) WO2013091579A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102572980B (zh) * 2011-12-22 2014-12-03 华为技术有限公司 移动台切换方法、设备和系统
CN104955115B (zh) * 2014-03-28 2019-03-01 华为技术有限公司 业务提供的方法、源基站和目标基站

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101600179A (zh) * 2008-06-07 2009-12-09 华为技术有限公司 呼叫切换、建立、处理方法及装置与系统
CN101674664A (zh) * 2008-09-12 2010-03-17 华为技术有限公司 用户面数据传输的方法和网络系统
WO2011086070A1 (en) * 2010-01-12 2011-07-21 Nokia Siemens Networks Oy Control of mid-call announcements during local call local switch by in-band tones
CN102572980A (zh) * 2011-12-22 2012-07-11 华为技术有限公司 移动台切换方法、设备和系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101600179A (zh) * 2008-06-07 2009-12-09 华为技术有限公司 呼叫切换、建立、处理方法及装置与系统
CN101674664A (zh) * 2008-09-12 2010-03-17 华为技术有限公司 用户面数据传输的方法和网络系统
WO2011086070A1 (en) * 2010-01-12 2011-07-21 Nokia Siemens Networks Oy Control of mid-call announcements during local call local switch by in-band tones
CN102572980A (zh) * 2011-12-22 2012-07-11 华为技术有限公司 移动台切换方法、设备和系统

Also Published As

Publication number Publication date
CN102572980A (zh) 2012-07-11
CN102572980B (zh) 2014-12-03

Similar Documents

Publication Publication Date Title
US20200366525A1 (en) Method, device, and system for controlling tunnel identifier allocation
KR102409642B1 (ko) 핸드오버를 지원하는 방법 및 상응하는 기지국 및 네트워크 노드
US20070213058A1 (en) Method and apparatus for supporting handoff and serving radio network subsystem relocation procedures in a single tunnel gprs-based wireless communication system
US20070213060A1 (en) Method and apparatus for supporting handoff in an lte gtp based wireless communication system
US20140376506A1 (en) Method, system and device for recovering invalid downlink data tunnel between networks
US20070248064A1 (en) Method and apparatus for supporting routing area update procedures in a long term evolution general packet radio service tunneling protocol-based system
US20080013553A1 (en) Activation of multiple bearer services in a long term evolution system
JP2022177051A (ja) パケット伝送方法、装置、およびシステム
WO2008092408A1 (en) Method, device and system for establishing s1 signaling connection in evolved network
WO2017197564A1 (zh) 切换过程中的通信方法和装置
WO2008106891A1 (fr) Procédé, système de communication et entité de réseau pour le transfert d'un groupe de nœuds
WO2017197565A1 (zh) 切换过程中的通信方法和装置
WO2010020176A1 (zh) 业务切换及网络资源分配方法、网络节点及移动性管理实体设备
WO2009149636A1 (zh) 在基站收发信台进行通信交换的方法及基站子系统
US20050268150A1 (en) Routing method and network element
WO2011085668A1 (zh) 切换控制方法和相关设备及系统
WO2008113283A1 (fr) Procédé et équipement de suivi de signalisation
WO2010105525A1 (zh) 一种切换的优化方法、切换装置和系统
WO2009067912A1 (fr) Procédé et dispositif de commutation pour mettre en œuvre une commutation
AU2007222104A1 (en) Method and apparatus for supporting handoff and serving radio network subsystem relocation procedures in a single tunnel GPRS-based wireless communication system
WO2014050345A1 (ja) ハンドオーバ元無線基地局、ハンドオーバ先無線基地局、無線通信システムおよび無線通信方法
WO2013091579A1 (zh) 移动台切换方法、设备和系统
WO2013079019A1 (zh) 通信方法、基站、基站控制器和移动交换中心
WO2011113210A1 (zh) 多基站间本地交换的方法及装置
WO2008148313A1 (fr) Procédé de transfert, station mobile et dispositif de commutation

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12858754

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12858754

Country of ref document: EP

Kind code of ref document: A1