WO2010102585A1 - 一种在呼叫建立过程中对本地通话建立本地交换的方法、设备及系统 - Google Patents

一种在呼叫建立过程中对本地通话建立本地交换的方法、设备及系统 Download PDF

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Publication number
WO2010102585A1
WO2010102585A1 PCT/CN2010/071029 CN2010071029W WO2010102585A1 WO 2010102585 A1 WO2010102585 A1 WO 2010102585A1 CN 2010071029 W CN2010071029 W CN 2010071029W WO 2010102585 A1 WO2010102585 A1 WO 2010102585A1
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Prior art keywords
call
local
bsc
belongs
msc server
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PCT/CN2010/071029
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English (en)
French (fr)
Inventor
李靖
王欣晖
王丽涛
茅非
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2010102585A1 publication Critical patent/WO2010102585A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/12Setup of transport tunnels

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a method, device and system for establishing a local exchange for a local call during a call setup process.
  • GSM Global System for Mobile Communications
  • MSC Server Mobile Switching Center Server
  • BSC Base Station Controller
  • a interface is used for communication
  • the mobile terminal Mobile Station, MS for short
  • BTS Base Transceiver Station
  • the BTS and the BSC are connected via an Abis interface.
  • the calling process initiated by the MS in the GSM system includes the following steps:
  • the MS sends a Channel Required (Channel Request, Channel REQ) message to the BTS on the access channel of the air interface;
  • the BTS sends a Channel Required (Channel Requirement, Channel RQD) message to the BSC;
  • the BSC After receiving the Channel Required message, the BSC allocates a signaling channel and sends a Channel Activation (Channel Activation, referred to as Channel ACT) message to the BTS;
  • Channel Activation Channel Activation
  • the BTS After receiving the Channel Activation message, the BTS, if the channel type is correct, turns on the power amplifier on the designated channel, starts to receive information, and sends a Channel Activation Acknowledge (Channel Activation Acknowledge) message to the BSC;
  • Channel Activation Acknowledge Channel Activation Acknowledge
  • the BSC sends an Immediate Assignment Command (IMM ASS CMD) to the MS through the BTS;
  • IMM ASS CMD Immediate Assignment Command
  • the BTS sends an Establishment Indication (Building Indication, EST IND for short) to the BSC, which contains the CM Service Request message content;
  • the BSC establishes an A-interface SCCP link and sends Complete Layer 3 Information to the MSC;
  • the MSC returns a link confirmation (referred to as CC) message to the BSC;
  • the MSC sends a CM Service Accepted message
  • the MSC sends a Call Proceeding message to the calling MS;
  • the MSC sends an Assignment Request (ASS REQ) message to the BSC, in which an A-interface CIC (Circuit Identity Codec) or a Call Identifier (Call Identifier, Called for Call) is assigned. ID ) ;
  • A-interface CIC Circuit Identity Codec
  • Call Identifier Call Identifier
  • the BSC allocates a voice channel and sends a Channel Activation to the BTS;
  • the BTS After receiving the Channel Activation, the BTS, if the channel type is correct, turns on the power amplifier on the specified channel, the uplink starts to receive information, and sends the Channel Activation to the BSC.
  • the BSC sends an Assignment Command to the MS through the BTS (abbreviated as ASS CMD);
  • the MS sends a SABM frame to access on the channel specified in the Assignment Command; (19) the BTS returns the UA frame for confirmation;
  • BTS sends Establishment Indication to BSC
  • the BSC After the wireless service channel and the ground circuit are successfully connected, the BSC sends an Assignment Complete message to the MSC, and considers that the call enters a call state;
  • the MSC sends an Alerting to the calling MS, and the calling MS rings;
  • Connect ACK Connect Acknowledge
  • the process of MS being called in the GSM system includes the following steps:
  • the MSC sends Paging to the BSC.
  • the message includes a paging cell list and a TMSI (Temperate Mobile Subscriber Indentity) and an IMSI (International Mobile Subscriber Identity) information;
  • TMSI Temporate Mobile Subscriber Indentity
  • IMSI International Mobile Subscriber Identity
  • the BSC sends a paging command (Paging Command, Paging CMD for short) message to the paging cell, where the message includes the number of the paging subchannel and the occupied slot number;
  • Paging Command Paging CMD for short
  • the BTS After receiving the Paging Command message of the BSC, the BTS sends a Paging Request (Paging REQ) message on the paging subchannel to which the paging group belongs, where the message includes the IMSI of the paged user. Or TMSI;
  • Paging REQ Paging Request
  • the calling and calling user in the GSM system performs the assignment in the A port when the call is established, whether the call is based on a TDM (Time Division Multiplex) or an IP bearer.
  • a call identifier is assigned to the call.
  • the user plane voice of the calling party is transmitted to the media gateway (Media Gateway, referred to as MGW) through the BSC, and then transmitted by the MGW to the BSC of the opposite end, even if both parties are in the same Under a BSC.
  • MGW Media Gateway
  • the two parties of the call belong to the same BTS, or belong to different BTSs under the same BTS cluster, or belong to the same BSC.
  • the current call processing flow is followed, the following problems occur:
  • the user plane voice of the calling party is transmitted to the BSC through the Abis port of the BTS, and the BSC transmits the user plane voice to the MGW, and the MGW transmits the user plane voice back to the original BSC.
  • the original BSC transmits the user plane voice to the original BTS. The situation causes a waste of transmission resources of the Abis port and the A port;
  • the user plane voice of the calling party is transmitted to the control BTS of the BTS cluster through the Abis port of the BTS, and the control BTS then passes the user through its Abis port.
  • the voice is transmitted to the BSC, and the BSC transmits the user plane voice to the MGW.
  • the MGW then transmits the user plane voice back to the original BSC, and the original BSC transmits the user plane voice to the control BTS, and the control BTS then performs the user plane.
  • the voice is transmitted to the original BTS, the above-mentioned control of the Abis port transmission resource between the BTS and the BSC is wasted, and the A port transmission resource is also wasted;
  • the BSC first transmits the user plane voice to the MGW, and the MGW transmits the user plane voice to the BSC, resulting in waste of the A port transmission resources.
  • the technical problem to be solved by the present invention is to provide a method, device and system for establishing a local exchange for a local call during a call setup process, and implementing a local exchange function for a local call.
  • the present invention provides a method for establishing a local exchange for a local call during a call setup process, including:
  • the mobile switching center server MSC server Before transmitting the assignment request message, the mobile switching center server MSC server determines whether the call to which the current call belongs is a local call, and notifies the base station controller BSC to which the call participant belongs by using the assignment request message;
  • the BSC learns that the current call and the call to which the opposite call belongs to the local call according to the assignment request message, then the internal user plane connection between the current call and the opposite call is established subsequently to implement local exchange of voices on both sides of the call. .
  • the call participant may be either the calling party or the calling party.
  • the MSC server determines whether the call to which the current call belongs is a local call, and notifies the BSC to which the call participant belongs by using the assignment request message: if the MSC server determines that the call to which the current call belongs is a local call, Carrying a local call identifier in an assignment request message sent to a BSC to which the call participant belongs;
  • the BSC learns that the current call and the call to which the peer call belongs to the local call according to the assignment request message: the assignment request message received by the BSC carries the local call identifier.
  • the local call identifier may be a circuit identification code CIC or a call identifier of the opposite call; the BSC learns, according to the assignment request message, that the current call and the call to which the opposite call belongs are local calls: the BSC receives After the request message is assigned, if it is determined that the local call identifier carried in the call is the circuit identification code CIC or the call identifier of the opposite call, it is known that the current call and the call to which the opposite call belongs are local calls.
  • the MSC server determines whether the call to which the current call belongs is a local call, and notifies the BSC to which the call participant belongs by using the assignment request message: the MSC server assigns a corresponding value to the local call identifier according to the judgment result. And then sending an assignment request message carrying the local call identifier to the BSC to which the call participant belongs;
  • the BSC learns that the current call and the call to which the peer call belongs to the local call according to the assignment request message: after receiving the assignment request message, the BSC learns the current call and the call to which the opposite call belongs according to the value of the local call identifier. Whether it is a local call.
  • the MSC server determines whether the call to which the current call belongs is a local call, and the BSC to which the call participant belongs is also indicated by the assignment request message: if the MSC server determines that the call to which the current call belongs is a local call, The same call code is assigned to the current call and the opposite call, otherwise different call codes are assigned to the two calls; wherein, the call codes allocated for the two calls that do not belong to the same call are different; then, the MSC server is And respectively assigning a corresponding calling code to the assignment request message sent by the current call and the BSC to which the opposite end call belongs;
  • the BSC learns that the current call and the call to which the peer call belongs to the local call according to the assignment request message: after the BSC receives the assignment request message, if it is determined that the call code has the same call code as the current call The call is made to know that the two calls with the same calling code belong to the local call.
  • the method further includes the
  • the BSC determines whether the local switching function can be used. This step includes:
  • the local switching function can be used; Otherwise the local exchange function cannot be used.
  • the subsequent establishment of the internal user plane connection by the BSC may be: the BSC establishes the internal user plane connection after learning that the current call and the call to which the opposite call belongs are local calls.
  • the above method may further include:
  • the BSC After completing the establishment of the internal user plane connection, the BSC informs the MSC server that its internal user plane connection has been established by replying to the MSC server with an assignment completion message.
  • the BSC may also establish an internal user plane connection in the following manner: the BSC may reply to the MSC server with an assignment completion message after learning that the current call and the call to which the opposite call belongs are a local call, and inform the MSC server of the Whether the local exchange function can be used;
  • the MSC server After receiving the assignment completion message, the MSC server, if it is determined that the local call can use the local exchange function, sends a local exchange command to the BSC when needed later; and the BSC receives the local exchange After the command, establish an internal user plane connection, and then start using the local call local exchange function.
  • the present invention also provides a base station controller BSC supporting the implementation of establishing a local exchange for a local call during call setup, the BSC being set to:
  • the called call is a local call
  • a content user plane connection between the current call and the peer call is established, thereby supporting local exchange of voices of the user planes of the call.
  • the local call identifier may be carried in the assignment request message sent by the MSC server.
  • the local call identifier may be a circuit identification code CIC or a call identifier of the opposite end call. After receiving the assignment request message, the BSC determines that the local call identifier carried therein is a circuit identification of the opposite call. The code CIC or the presence of two calls using the same call identifier, it is known that the current call and the call to which the opposite call belongs are local calls.
  • the assignment request message sent by the MSC server may also carry a local call identifier assigned a corresponding value
  • the BSC After receiving the assignment request message, the BSC determines, according to the value of the local call identifier, Whether the call to which the previous call and the peer call belong is a local call.
  • the assignment request message sent by the MSC server may also carry a corresponding call code: if the call to which the current call belongs is a local call, the same call code is assigned to the current call and the opposite call, otherwise the two are assigned different Call code; where, the call codes assigned to two calls that do not belong to the same call are different;
  • the BSC After receiving the assignment request message, the BSC determines that there is a call with the same calling code as the current call, and knows that the call to which the call with the same calling code belongs is a local call.
  • the BSC may establish the internal user plane connection after learning that the current call is a local call with the call to which the opposite call belongs.
  • the BSC can also be set to:
  • the MSC server After completing the establishment of the internal user plane connection, the MSC server is informed that its internal user plane connection has been established by replying to the MSC server with an assignment completion message.
  • the BSC can also be set to:
  • the local switching function can be used.
  • the BSC can also be set to:
  • the present invention also provides a mobile switching center server MSC server supporting the implementation of local exchange for local calls during call setup, the MSC server being configured to:
  • the call participant is either one of the called party users or the main called party.
  • the MSC server may carry the local call identifier in the assignment request message sent to the BSC to which the call participant belongs, thereby The BSC learns whether the current call and the call to which the opposite call belongs are local calls according to the local call identifier.
  • the local call identifier may be a circuit identification code CIC or a call identifier of the opposite call.
  • the MSC server may also assign a corresponding value to the local call identifier according to the judgment result, and then send an assignment request message carrying the local call identifier to the BSC to which the call participant belongs, so that the BSC can identify the local call identifier according to the local call identifier.
  • the value is used to know whether the current call and the call to which the opposite call belongs are local calls. If the MSC server determines that the call to which the current call belongs is a local call, the same call code may be assigned to the current call and the opposite call, otherwise, different call codes are assigned to the two calls; wherein, the call is not in the same call.
  • the call codes assigned by the two callers are different; the corresponding call code is carried in the assignment request message sent to the BSC to which the current call and the opposite call belong, respectively, so that the BSC has the same as the current call existing on the BSC.
  • the call of the calling code is learned that the calls to which the two calls with the same calling code belong are local calls.
  • the MSC server can also be configured to:
  • the MSC server can also be configured to:
  • the BSC sends a local exchange command, thereby enabling the BSC to establish an internal user plane connection, using the local call local exchange function.
  • the present invention also provides a system for establishing a local exchange for a local call during call setup, comprising a base station controller BSC as described above and the mobile switching center server MSC server.
  • the waste of the Abis port and the A port is avoided, and the Local Switch (LS) function of the local call is implemented, so that the local call can be in the BTS, in the BTS cluster, or in the BSC. Can complete the exchange of user plane voice.
  • LS Local Switch
  • FIG. 1 is a calling process in the prior art
  • FIG. 3 is a schematic diagram of user plane voice transmission between MS, BSC and MGW in the prior art
  • FIG. 4 is a flow chart of A interface signaling for optimizing an assignment request message in a call setup process according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of voice transmission of a user plane between an MS, a BSC, and an MGW after a local exchange is implemented for a local call according to an embodiment of the present invention
  • FIG. 6 is a flow chart of the MSC server informing the BSC whether the call to which the current call belongs is a local call in the call setup process according to the embodiment of the present invention
  • FIG. 7 is a flowchart of a call identifier or a circuit identification code of a peer call in the flow shown in FIG. 6 in the process shown in FIG. 6 according to the embodiment of the present invention
  • FIG. 8 is a flow chart of the MSC server informing the BSC whether the call to which the current call belongs is a local call by assigning a specific value to the local call identifier in the call setup process according to the embodiment of the present invention
  • FIG. 9 is a flow chart of the MSC server informing the BSC whether the call to which the current call belongs is a local call by assigning the same call code to the current call and the opposite call in the call setup process according to the embodiment of the present invention
  • FIG. 10 is a signaling flowchart of the BSC notifying whether the internal user plane connection of the MSC server has been established in the embodiment of the present invention.
  • the invention provides a method for establishing a local exchange for a local call during a call setup process, as shown in the figure.
  • the MSC server sends an assignment request message in addition to the existing protocol specification function. Before using the prior art, it is determined whether the call to which the current call belongs is a Local Call, and the BSC to which the call participant belongs is notified by the assignment request message, wherein the call participant can be any of the two parties or the main called user.
  • the call participant can be any of the two parties or the main called user.
  • the BSC learns that the current call and the call to which the opposite call belongs to the local call according to the assignment request message, then the local exchange of the user's voice on both sides of the call is realized by establishing an internal user plane connection between the current call and the opposite call.
  • the user plane voice between the two parties can be forwarded without the core network, but directly sent to the other party through the internal user plane connection, as shown in FIG. 5.
  • the location of the internal user plane connection is different according to the location of the two parties: If the current call and the peer call belong to the same BTS, the internal user plane connection is established in the BTS, and the user plane voice is forwarded to the BTS through the BTS.
  • the internal user plane connection is established inside the BTS cluster, and the user plane voice is forwarded to the calling party through the BTS cluster; if the current call and the opposite call Within the same BSC, the internal user plane connection is established inside the BSC, and the user plane voice is forwarded to both parties through the BSC.
  • the MSC server informs the BSC and the BSC to which the call participant belongs to know whether the call to which the call belongs is a local call or not:
  • Manner 1 As shown in FIG. 6, if the MSC server determines that the call to which the current call belongs is a local call, the MSC server carries a local call identifier in the assignment request message sent to the BSC to which the call participant belongs, and the identifier is used for Informing the BSC that the call (consisting of the current call and the peer call corresponding to the current call) is a local call, otherwise, the assignment request message is directly sent, which does not carry the local call identifier; if the BSC receives the assignment request message, if it is judged If the local call identifier is carried, the current call and the call to which the corresponding peer call belongs are local calls.
  • the MSC server determines that the call to which the current call belongs is a local call
  • the local call identifiers carried in the assignment request messages sent to the current call and the B SC to which the opposite call belongs are the same.
  • the local call identifier may be a unique serial number assigned by the MSC server for the call, and the format thereof may be as shown in Table 1, wherein the local call identifier occupies 8 bits. The lower bits 1, 2, 3 and 4 are used to indicate the local call identifier for this call.
  • the local call identifier may also be a circuit identifier CIC or a call identifier (Call Identifier) of a peer call that constitutes a local call with the current call, where the CIC is an existing circuit identifier (for the flag) The A port call carried on the TDM Transport), where the Call Identifier is also the existing Call ID (used to mark the A port call carried on the IP Transport).
  • CIC circuit identifier
  • Call Identifier Call ID of a peer call that constitutes a local call with the current call
  • the CIC is an existing circuit identifier (for the flag)
  • the Call Identifier is also the existing Call ID (used to mark the A port call carried on the IP Transport).
  • the Local Call reference ID for IP When the peer call is based on TDM transmission on the A port, the Local Call reference ID for TDM is used as the local call identifier, and the value occupies 2 octets; and when the peer calls the A port. When transmitting based on IP, the Local Call reference ID for IP is used as the local call identifier, and its value occupies 4 octets.
  • the representation of Circuit Identity Codec and Call Identifier is prior art.
  • Octet 4 octet 5 As shown in Figure 7, in this case, after receiving the assignment request message, the BSC knows that the local call identifier carried in it is the circuit identification code CIC or call identifier of the opposite call. The current call and the call to which the opposite call belongs are local calls.
  • the MSC server determines whether the call to which the current call belongs is a local call, and assigns a corresponding value to the local call identifier according to the judgment result, and then sends the local call identifier to the BSC to which the call participant belongs. Assigning a request message; after receiving the assignment request message, the BSC can know whether the current call and the opposite call constitute a local according to the value of the local call identifier. Call.
  • the local call identifier can occupy 8 bits, and the value of the low bit 1 can be used to indicate the state of the call, and other bits can be reserved. Specifically, when the value of bit 1 is 1, it indicates that the call is a local call; when the value of bit 1 is 0, it indicates that the call is not a local call, and vice versa.
  • Manner 3 As shown in Figure 9, if the MSC server determines that the call to which the current call belongs is a local call, the same call code is assigned to the current call and the opposite call. Otherwise, different call codes are assigned to the two.
  • the calling codes allocated for the two calls that do not belong to the same call are different, and the calling code can be, but is not limited to, the format described in Table 1 above.
  • the MSC server carries the corresponding call code in the assignment request message sent to the current call and the BSC to which the opposite call belongs, respectively; after receiving the assignment request message, the BSC searches for all the calls on it to have the same as the current call.
  • the call of the calling code if any, considers that the call to which the two calls with the same calling code belong is a local call; otherwise, the call to which the current call belongs is not the local call.
  • the BSC may further include the following steps before establishing an internal user plane connection:
  • the BSC can establish a transmission channel (ie, an internal user plane connection) that directly transmits the voice of the user's face of the call, and the user plane voice of the party on the call can be directly transmitted to the other party of the call.
  • a transmission channel ie, an internal user plane connection
  • the voice coding mode of the two parties is not compatible.
  • the BSC establishes an internal user plane connection, and the user plane voice of the calling party is first transmitted to the TC in the BSC, and the TC will receive the TC.
  • the incoming user plane voice is converted to the other party's compatible encoding mode and then transmitted to the other party.
  • step (2) subsequent establishment of internal user plane connections can be divided into the following two cases:
  • the BSC is established after receiving the local exchange command sent to it by the MSC server.
  • the BSC to which the call participant belongs can complete the assignment to the MSC server after completing the establishment of the internal user plane connection.
  • the message informs the latter that its internal user plane connection has been established, as shown in Figure 10.
  • the MSC server can use the local exchange if it is determined that both parties constituting the local call have completed the preparation for the local exchange.
  • the user plane voice can still be transmitted through the connection between the BSC and the MGW.
  • the MSC server can notify the BSC to use the local call local switching function when needed, and remove the connection between the BSC and the MGW.
  • the specific implementation manner may be that the MSC server sends a message to the BSC to inform the BSC to start using the local exchange local call function, which is a signaling sent by the newly added MSC server to the BSC. After receiving the message, the BSC uses the local call local switching function to no longer transmit the user plane voice through the connection between the BSC and the MGW, and removes the connection with the MGW.
  • the MSC server sends a message to the BSC to inform the BSC to start using the local exchange local call function, which is a signaling sent by the newly added MSC server to the BSC.
  • the BSC uses the local call local switching function to no longer transmit the user plane voice through the connection between the BSC and the MGW, and removes the connection with the MGW.
  • the manner in which the BSC informs the MSC server whether its internal user plane connection has been established may be to add a local call connection completion indicator in the assignment completion message, the format of which is shown in Table 5, and the local call connection completion indicator may occupy 8 bits.
  • the lower bit 1 is used to indicate the status of the local exchange, and other bits can be reserved. Specifically, bit 1 can be used to indicate whether the BSC is ready to use the local call local exchange function. When the value of bit 1 is 1, it indicates that the local call local exchange function can be used by the BSC. When the value of bit 1 is 0, it indicates that the BSC cannot use the local call local exchange function, and vice versa.
  • the BSC to which the call participant belongs is aware that the current call and the call to which the opposite call belongs are local calls, and the MSC server is replied to the assignment completion message to inform the latter whether the local exchange function can be used.
  • the MSC server may send a local exchange command to the BSC if it is determined that the local call can use the local exchange function, and the message is a newly added signaling sent by the MSC server to the BSC. .
  • the BSC After receiving the command, the BSC establishes an internal user plane connection, and then starts to use the local call local exchange function, no longer transmits the user plane voice through the connection between the BSC and the MGW, and removes the connection with the MGW.
  • the BSC provided by the present invention supports the establishment of a local exchange for local calls during call setup.
  • the associated call is a local call
  • the content user connection between the current call and the peer call is subsequently established, thereby supporting local exchange of voices of the user planes of the call.
  • the assignment request message sent by the MSC server may carry a local call identifier, where the local call identifier may be a circuit identification code CIC or a call identifier of the opposite call;
  • the BSC After the BSC receives the assignment request message, if it is determined that the local call identifier carried in the call is the circuit identification code CIC of the opposite call or the presence of two calls uses the same call identifier, the current call and the opposite end are learned.
  • the call to which the call belongs is a local call.
  • the assignment request message sent by the MSC server may also carry a local call identifier assigned a corresponding value
  • the BSC After receiving the assignment request message, the BSC determines, according to the value of the local call identifier, whether the current call and the call to which the opposite call belongs are local calls.
  • the assignment request message sent by the MSC server may also carry a corresponding call code: if the call to which the current call belongs is a local call, the same call code is assigned to the current call and the opposite call, otherwise the two are assigned different Call code; where, the call codes assigned to two calls that do not belong to the same call are different; After receiving the assignment request message, the BSC determines that there is a call with the same calling code as the current call, and knows that the call to which the call with the same calling code belongs is a local call.
  • the BSC may establish the internal user plane connection after learning that the current call is a local call with the call to which the opposite call belongs.
  • the BSC can also be set to:
  • the MSC server After completing the establishment of the internal user plane connection, the MSC server is informed that its internal user plane connection has been established by replying to the MSC server with an assignment completion message.
  • the BSC can also be set to:
  • the local switching function can be used.
  • the BSC can also be set to:
  • the MSC server provided by the present invention supports the establishment of a local exchange for local calls during call setup:
  • the call participant is either one of the called party users or the main called party.
  • the MSC server may carry the local call identifier in the assignment request message sent to the BSC to which the call participant belongs, so that the BSC can refer to the call.
  • the local call identifier is used to know whether the current call and the call to which the opposite call belongs are local calls.
  • the local call identifier may also be a circuit identification code CIC or call identifier of the opposite call.
  • the MSC server may further assign a corresponding value to the local call identifier according to the judgment result, and then send an assignment request message carrying the local call identifier to the BSC to which the call participant belongs, thereby
  • the BSC learns whether the current call and the call to which the opposite call belongs are local calls according to the value of the local call identifier. If the MSC server determines that the call to which the current call belongs is a local call, the same call code may be assigned to the current call and the opposite call, otherwise, different call codes are assigned to the two calls; wherein, the call is not in the same call.
  • the call codes assigned by the two callers are different; the corresponding call code is carried in the assignment request message sent to the BSC to which the current call and the opposite call belong, respectively, so that the BSC has the same as the current call existing on the BSC.
  • the call of the calling code is learned that the calls to which the two calls with the same calling code belong are local calls.
  • the MSC server can also be configured to:
  • the MSC server can also be configured to:
  • the BSC sends a local exchange command, thereby enabling the BSC to establish an internal user plane connection, using the local call local exchange function.
  • the present invention provides a system for establishing a local exchange for a local call during a call setup process, including the BSC as described above and the MSC server.
  • the waste of Abis port and A port transmission resources is avoided, and the local exchange function of the local call is realized, so that the local call can complete the user plane voice exchange in the BTS, in the BTS cluster, or in the BSC. .

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  • Telephonic Communication Services (AREA)

Abstract

本发明提供一种在呼叫建立过程中对本地通话建立本地交换的方法,包 括:在发送指派请求消息前,移动交换中心服务器MSC服务器判断当前呼叫所属的通话是否是本地通话,并通过指派请求消息告知通话参与方所属的基站控制器BSC;BSC若根据指派请求消息获知当前呼叫与对端呼叫所属的通话为本地通话,则在后续建立当前呼叫与对端呼叫间的内部用户面连接来实现上述通话双方用户面语音的本地交换。本发明还提供一种支持实现该方法的设备和系统。采用本发明后,避免了Abis口和 A口传输资源的浪费,实现了本地通话的本地交换功能,使得本地通话可以在 BTS内、BTS簇内或者BSC内就能完成用户面语音的交换。

Description

一种在呼叫建立过程中对本地通话建立本地交换的方法、 设备及系统
技术领域
本发明涉及移动通信领域, 尤其涉及一种在呼叫建立过程中对本地通话 建立本地交换的方法、 设备及系统。
背景技术
在现有的全球移动通讯系统 ( Global System for Mobile Communications, 简称为 GSM ) 中, 移动交换中心服务器(Mobile Switching Center Server, 简 称为 MSC Server )和基站控制器( Base Station Controller, 简称为 BSC )之间 釆用 A接口进行通信, 而移动终端 (Mobile Station, 简称为 MS )与基站收 发台 ( Base Transceiver Station, 简称为 BTS )通过空中接口 Um接口进行通 信。 此外, BTS与 BSC之间通过 Abis接口连接。
GSM系统中 MS发起的主叫流程, 如图 1所示, 包括以下步骤:
( 1 ) MS在空中接口的接入信道上向 BTS发送 Channel Required (信道 请求, 简称为 Channel REQ ) 消息;
( 2 ) BTS向 BSC发送 Channel Required (信道需求, 简称为 Channel RQD ) 消息;
( 3 ) BSC收到 Channel Required消息后, 分配信令信道, 向 BTS发送 Channel Activation (信道激活, 简称为 Channel ACT ) 消息;
( 4 ) BTS收到 Channel Activation消息后, 如果信道类型正确, 则在指 定信道上开功率放大器,上行开始接收信息,并向 BSC发送 Channel Activation Acknowledge (信道激活确认, 简称为 Channel ACT ACK ) 消息;
( 5 ) BSC通过 BTS向 MS发送 Immediate Assignment Command (立即 指派命令, 简称为 IMM ASS CMD ) ;
( 6 ) MS发 SABM ( Set Asynchronous Balanced Mode, 设置异步平衡模 式) 帧接入;
( 7 ) BTS回 UA ( Unnumbered Acknowledgement, 无编号确认 ) 帧进行 确认;
( 8 ) BTS向 BSC发 Establishment Indication (建立指示, 简称为 EST IND ) , 内含 CM Service Request (链接管理业务请求) 消息内容;
( 9 ) BSC建立 A接口 SCCP链接, 向 MSC发送 Complete Layer 3 Information (层 3 成消息 ) ;
( 10 ) MSC向 BSC回链接确认 (简称为 CC ) 消息;
( 11 ) MSC发 CM Service Accepted (链接管理业务接受) 消息;
( 12 ) 主叫 MS发 Setup (建立呼叫 ) 消息;
( 13 ) MSC向主叫 MS发 Call Proceeding (呼叫进行 ) 消息;
( 14 ) MSC向 BSC发 Assignment Request(指派请求,简称为 ASS REQ ) 消息, 在该消息中, 分配了 A接口 CIC ( Circuit Identity Codec , 电路识别码 ) 或者呼叫标识符 ( Call Identifier, 简称为 Call ID ) ;
( 15 ) BSC分配话音信道, 向 BTS发送 Channel Activation;
( 16 ) BTS收到 Channel Activation后, 如果信道类型正确, 则在指定信 道上开功率放大器, 上行开始接收信息, 并向 BSC发送 Channel Activation
Acknowledge;
( 17 ) BSC通过 BTS向 MS发送 Assignment Command (指派命令, 简 称为 ASS CMD ) ;
( 18 ) MS发 SABM帧在 Assignment Command中指定的信道上接入; ( 19 ) BTS回 UA帧进行确认;
( 20 ) BTS向 BSC发 Establishment Indication;
( 21 ) MS在接入话音信道后, 发送 Assignment Complete (指派完成, 简称为 ASS CMP ) 消息;
( 22 ) 无线业务信道和地面电路均成功连接后, BSC 向 MSC 发送 Assignment Complete消息, 并认为该呼叫进入通话状态;
( 23 ) MSC向主叫 MS发 Alerting (振铃 ) , 主叫 MS振铃;
( 24 ) MSC向主叫 MS发 Connect (连接 ) ; ( 25 ) 主叫 MS向 MSC回 Connect Acknowledge (连接确认, 简称为 Connect ACK ) ;
( 26 ) 主叫 MS和被叫 MS进入语音通话状态。
GSM系统中 MS被叫的流程, 如图 2所示, 包括以下步骤:
( 1 ) 当被寻呼的 MS在 MSC的服务区内时, MSC向 BSC发送 Paging
(寻呼) 消息, 该消息中包含寻呼小区列表以及 TMSI ( Temperate Mobile Subscriber Indentity , 临时移动用户识别码) 和 IMSI ( International Mobile Subscriber Identity, 国际移动用户识别码)信息;
( 2 ) BSC向寻呼小区发送 Paging Command (寻呼命令, 简称为 Paging CMD ) 消息, 该消息中包含所属寻呼子信道的号码和所占用的时隙号;
( 3 ) BTS收到 BSC的 Paging Command消息后,在该寻呼组所属的寻呼 子信道上发送 Paging Request (寻呼请求, 简称为 Paging REQ )消息, 该消息 中包含被寻呼用户的 IMSI或 TMSI;
( 4 ) MS解码寻呼消息后, 若发现是对自己的寻呼, 则将发出 Channel Request 消息来触发初始化信道分配过程;
后续流程同上述主叫流程, 在此不再进行赘述。
从上述流程可以看出, GSM系统中的主被叫用户在建立呼叫时,在 A口 进行指派的过程中, 无论该呼叫是基于 TDM ( Time Division Multiplex, 时分 复用 )承载还是基于 IP承载, 均会为该呼叫分配一个呼叫标识。
目前在 GSM系统的主叫与被叫流程中,都会将呼叫一方的用户面语音通 过 BSC传递给媒体网关( Media Gateway, 简称为 MGW ), 再由 MGW传递 给对端的 BSC, 即使通话双方处于同一个 BSC下。 但是, 在实际的 GSM网 络中, 存在着大量 Local Call (本地通话)的情况, 即通话双方属于同一 BTS 下、 或者属于同一 BTS簇下的不同 BTS、 或者属于同一 BSC下。 对于这些 本地通话, 如果沿用目前的呼叫处理流程, 则会出现以下问题:
( 1 ) 对于属于同一 BTS下的呼叫, 就会出现呼叫一方的用户面语音通 过 BTS的 Abis口传送给 BSC, BSC再将该用户面语音传送给 MGW, MGW 再把用户面语音传送回原 BSC, 原 BSC再将该用户面语音传送给原 BTS的 情况, 导致 Abis口和 A口传输资源的浪费;
( 2 ) 对于属于同一 BTS簇下的不同 BTS间的呼叫, 就会出现呼叫一方 的用户面语音通过 BTS的 Abis口传送给该 BTS簇的控制 BTS, 该控制 BTS 再通过其 Abis口将该用户面语音传送给 BSC, BSC再将该用户面语音传送给 MGW, MGW再将用户面语音传送回原 BSC, 原 BSC再将该用户面语音传 送给上述控制 BTS, 上述控制 BTS再将该用户面语音传送给原 BTS的情况, 导致上述控制 BTS与 BSC间的 Abis口传输资源的浪费, 同时也浪费了 A口 传输资源;
如图 3所示, 对于属于同一 BSC下的呼叫, 就会出现 BSC先将用户面 语音传送给 MGW, MGW再把用户面语音传送给该 BSC的情况, 导致 A口 传输资源的浪费。 发明内容
本发明要解决的技术问题是提供一种在呼叫建立过程中对本地通话建立 本地交换的方法、 设备及系统, 对本地通话实现本地交换功能。
为解决上述问题, 本发明提供了一种在呼叫建立过程中对本地通话建立 本地交换的方法, 包括:
在发送指派请求消息前,移动交换中心服务器 MSC服务器判断当前呼叫 所属的通话是否是本地通话, 并通过所述指派请求消息告知通话参与方所属 的基站控制器 BSC; 以及
所述 BSC若根据所述指派请求消息获知当前呼叫与对端呼叫所属的通话 为本地通话, 则在后续建立当前呼叫与对端呼叫间的内部用户面连接来实现 通话双方用户面语音的本地交换。
所述通话参与方可以为主被叫用户双方或主被叫用户中的任意一方。 所述 MSC服务器判断当前呼叫所属的通话是否是本地通话,并通过所述 指派请求消息告知通话参与方所属的 BSC可以是指: 所述 MSC服务器若判 断出当前呼叫所属的通话是本地通话, 则在向通话参与方所属的 BSC发送的 指派请求消息中携带本地通话标识符; 所述 BSC根据所述指派请求消息获知当前呼叫与对端呼叫所属的通话为 本地通话是指: 所述 BSC收到的指派请求消息中携带所述本地通话标识符。
所述本地通话标识符可以为对端呼叫的电路识别码 CIC或呼叫标识符; 所述 BSC根据所述指派请求消息获知当前呼叫与对端呼叫所属的通话为 本地通话是指: BSC在收到指派请求消息后, 若判断出其中携带的本地通话 标识符为对端呼叫的电路识别码 CIC或呼叫标识符, 则获知当前呼叫及对端 呼叫所属的通话为本地通话。
所述 MSC服务器判断当前呼叫所属的通话是否是本地通话,并通过所述 指派请求消息告知通话参与方所属的 BSC还可以是指: 所述 MSC服务器根 据判断结果为本地通话标识赋予相应的值, 然后向通话参与方所属的 BSC发 送携带该本地通话标识的指派请求消息;
所述 BSC根据所述指派请求消息获知当前呼叫与对端呼叫所属的通话为 本地通话是指: BSC收到指派请求消息后, 根据其中本地通话标识的值获知 当前呼叫及对端呼叫所属的通话是否为本地通话。
所述 MSC服务器判断当前呼叫所属的通话是否是本地通话,并通过所述 指派请求消息告知通话参与方所属的 BSC还可以是指: 所述 MSC服务器若 判断出当前呼叫所属的通话是本地通话, 则为当前呼叫及对端呼叫分配相同 的呼叫码, 否则为上述二者分配不同的呼叫码; 其中, 为不属于同一通话的 两个呼叫分配的呼叫码不相同; 然后, 所述 MSC服务器在分别向当前呼叫及 对端呼叫所属的 BSC发送的指派请求消息中携带相应的呼叫码;
所述 BSC根据所述指派请求消息获知当前呼叫与对端呼叫所属的通话为 本地通话是指: 所述 BSC收到所述指派请求消息后, 若判断出其上存在与当 前呼叫具有相同呼叫码的呼叫, 则获知这两个带有相同呼叫码的呼叫所属的 通话为本地通话。 在所述 BSC建立所述内部用户面连接的步骤之前, 所述方法还包括所述
BSC判断是否能使用本地交换功能, 该步骤包括:
判断主被叫双方的语音编码方式是否兼容, 若兼容或不兼容但所述 BSC 内部有编解码器, 则能使用本地交换功能; 否则不能使用本地交换功能。
所述 BSC在后续建立内部用户面连接可以是指: 所述 BSC在获知当前 呼叫与对端呼叫所属的通话为本地通话后就建立所述内部用户面连接。
上述方法还可包括:
所述 BSC在完成内部用户面连接建立后, 通过向所述 MSC服务器回复 指派完成消息告知所述 MSC服务器其内部用户面连接已建立。
所述 BSC在后续建立内部用户面连接还可以是指: 所述 BSC在获知当 前呼叫与对端呼叫所属的通话为本地通话后,向所述 MSC服务器回复指派完 成消息, 告知所述 MSC服务器其是否能使用本地交换功能;
所述 MSC服务器在收到所述指派完成消息后,若判断出所述本地通话能 使用本地交换功能, 则在后续需要时向所述 BSC发送本地交换命令; 以及 所述 BSC收到该本地交换命令后, 建立内部用户面连接, 然后开始使用 本地通话本地交换功能。
本发明还提供了一种支持实现在呼叫建立过程中对本地通话建立本地交 换的基站控制器 BSC, 所述 BSC设置为:
接收移动交换中心 MSC服务器所发送的指派请求消息,根据所述指派请 求消息判断当前呼叫与对端呼叫所属的通话是否为本地通话;
若所属的通话为本地通话, 则建立当前呼叫与对端呼叫间的内容用户面 连接, 从而支持实现该通话双方用户面语音的本地交换。
所述 MSC服务器发送的指派请求消息中可携带本地通话标识符。
所述本地通话标识符可以为对端呼叫的电路识别码 CIC或呼叫标识符; 所述 BSC收到所述指派请求消息后, 若判断出其中携带的本地通话标识 符为对端呼叫的电路识别码 CIC或存在两个呼叫使用相同的呼叫标识符, 则 获知当前呼叫及对端呼叫所属的通话为本地通话。
所述 MSC服务器发送的指派请求消息中还可携带被赋予相应的值的本 地通话标识符;
所述 BSC收到所述指派请求消息后,根据其中本地通话标识的值判断当 前呼叫及对端呼叫所属的通话是否为本地通话。
所述 MSC服务器发送的指派请求消息中还可携带相应的呼叫码:若当前 呼叫所属的通话是本地通话, 则为当前呼叫及对端呼叫分配相同的呼叫码, 否则为上述二者分配不同的呼叫码; 其中, 为不属于同一通话的两个呼叫分 配的呼叫码不相同;
所述 BSC收到所述指派请求消息后, 若判断出存在与当前呼叫具有相同 呼叫码的呼叫, 则获知带有相同呼叫码的呼叫所属的通话为本地通话。
所述 BSC可在获知当前呼叫与对端呼叫所属的通话为本地通话后就建立 所述内部用户面连接。
所述 BSC还可设置为:
在完成内部用户面连接建立后 ,通过向所述 MSC服务器回复指派完成消 息告知所述 MSC服务器其内部用户面连接已建立。
所述 BSC还可设置为:
判断主被叫双方的语音编码方式是否兼容, 若兼容或不兼容但所述 BSC 内部有编解码器, 则能使用本地交换功能。
所述 BSC还可设置为:
在获知当前呼叫与对端呼叫所属的通话为本地通话后 ,向所述 MSC月良务 器回复指派完成消息, 告知所述 MSC服务器其是否能使用本地交换功能; 收到所述 MSC服务器发送的所述本地交换命令后, 建立内部用户面连 接, 开始使用本地通话本地交换功能。
本发明还提供了一种支持实现在呼叫建立过程中对本地通话建立本地交 换的移动交换中心服务器 MSC服务器, 所述 MSC服务器设置为:
判断当前呼叫所属的通话是否是本地通话, 并通过指派请求消息告知通 话参与方所属的基站控制器 BSC, 其中,
所述通话参与方为主被叫用户双方或主被叫用户中的任意一方。
所述 MSC服务器若判断出当前呼叫所属的通话是本地通话,则可在向通 话参与方所属的 BSC发送的指派请求消息中携带本地通话标识符,从而使所 述 BSC才艮据其中的所述本地通话标识符来获知当前呼叫及对端呼叫所属的通 话是否为本地通话。
所述本地通话标识符可以为对端呼叫的电路识别码 CIC或呼叫标识符。 所述 MSC服务器还可根据判断结果为本地通话标识赋予相应的值,然后 向通话参与方所属的 BSC发送携带该本地通话标识的指派请求消息,从而使 所述 BSC才艮据其中本地通话标识的值来获知当前呼叫及对端呼叫所属的通话 是否为本地通话。 所述 MSC服务器若判断出当前呼叫所属的通话是本地通话,则还可以为 当前呼叫及对端呼叫分配相同的呼叫码,否则为上述二者分配不同的呼叫码; 其中, 为不属于同一通话的两个呼叫分配的呼叫码不相同; 在分别向当前呼 叫及对端呼叫所属的 BSC发送的指派请求消息中携带相应的呼叫码,从而使 所述 BSC根据其上存在的与当前呼叫具有相同呼叫码的呼叫来获知这两个带 有相同呼叫码的呼叫所属的通话为本地通话。
所述 MSC服务器还可设置为:
接收所述 BSC在完成内部用户面连接建立后回复的指派完成消息, 以获 知所述内部用户面连接已经建立。
所述 MSC服务器还可设置为:
接收所述 BSC在获知当前呼叫与对端呼叫所属的通话为本地通话后回复 的指派完成消息, 以获知其是否能使用本地交换功能;
若判断出所述本地通话能使用本地交换功能, 则在后续需要时向所述
BSC发送本地交换命令, 从而使所述 BSC建立内部用户面连接, 使用本地通 话本地交换功能。
本发明还提供一种实现在呼叫建立过程中对本地通话建立本地交换的系 统, 包括如前面所述的基站控制器 BSC和所述的移动交换中心服务器 MSC 服务器。
釆用本发明后,避免了 Abis口和 A口传输资源的浪费, 实现了本地通话 的本地交换(Local Switch, 简称 LS )功能, 使得本地通话可以在 BTS内、 BTS簇内、 或者 BSC内就能完成用户面语音的交换。 附图概述
图 1为现有技术中的主叫流程;
图 2为现有技术中的被叫流程;
图 3为现有技术中 MS、 BSC和 MGW间用户面语音传递的示意图; 图 4为本发明实施例中在呼叫建立过程中, 对指派请求消息进行优化的 A接口信令流程图;
图 5 为本发明实施例中对本地通话实现了本地交换以后 MS、 BSC和 MGW间用户面语音传递的示意图;
图 6为本发明实施例中在呼叫建立过程中, MSC服务器通过本地通话标 识符告知 BSC当前呼叫所属的通话是否是本地通话的流程图;
图 7为本发明实施例中图 6所示流程中本地通话标识符为对端呼叫的呼 叫标识符或电路识别码时的流程图;
图 8为本发明实施例中在呼叫建立过程中, MSC服务器通过为本地通话 标识符赋予特定的值来告知 BSC当前呼叫所属的通话是否是本地通话的流程 图;
图 9为本发明实施例中在呼叫建立过程中, MSC服务器通过为当前呼叫 及对端呼叫分配相同的呼叫码的方式来告知 BSC当前呼叫所属的通话是否是 本地通话的流程图; 以及
图 10为本发明实施例中 BSC通知 MSC服务器内部用户面连接是否已建 立的信令流程图。 本发明的较佳实施方式
下面将结合附图及实施例对本发明的技术方案进行更详细的说明。
本发明提供的在呼叫建立过程中对本地通话建立本地交换的方法, 如图
4所示, 包括:
( 1 ) MSC服务器除了完成现有协议规范功能外, 在发送指派请求消息 前, 利用现有技术判断当前呼叫所属的通话是否是 Local Call, 并通过指派请 求消息告知通话参与方所属的 BSC, 其中, 通话参与方可以为主被叫用户双 方或主被叫用户中的任意一方;
( 2 )BSC若根据指派请求消息获知当前呼叫与对端呼叫所属的通话为本 地通话, 则在后续通过建立当前呼叫与对端呼叫间内部用户面连接的方式实 现通话双方用户面语音的本地交换, 该通话双方间的用户面语音可以不再经 过核心网转发, 而是直接通过该内部用户面连接发送给对方, 如图 5所示。 该内部用户面连接建立的位置根据通话双方位置的不同而不同: 如果当前呼 叫与对端呼叫属于同一个 BTS内部,则该内部用户面连接建立在该 BTS内部, 用户面语音通过该 BTS转发给呼叫双方; 如果当前呼叫与对端呼叫属于同一 个 BTS簇内部, 则该内部用户面连接建立在该 BTS簇内部, 用户面语音通过 该 BTS簇内部转发给呼叫双方; 如果当前呼叫与对端呼叫属于同一个 BSC 内部, 则该内部用户面连接建立在该 BSC内部, 用户面语音通过该 BSC转 发给呼叫双方。
在上述步骤(1 )中, MSC服务器告知通话参与方所属的 BSC及 BSC获 知呼叫所属通话是否是本地通话可以釆用以下方式:
方式一: 如图 6所示, MSC服务器若判断出当前呼叫所属的通话是本地 通话, 则在发送给通话参与方所属的 BSC的指派请求消息中携带一本地通话 标识符, 该标识符用于告知 BSC该次通话(由当前呼叫及与当前呼叫对应的 对端呼叫构成) 为本地通话, 否则, 直接发送指派请求消息, 其中不携带本 地通话标识符; BSC收到指派请求消息后, 若判断出其中携带有本地通话标 识符, 则获知当前呼叫及对应的对端呼叫所属的通话为本地通话。
优选的, 当 MSC服务器判断出当前呼叫所属的通话是本地通话时,在分 别发送给当前呼叫及对端呼叫所属的 B SC的指派请求消息中携带的本地通话 标识符相同。
在此种方式中,该本地通话标识符可以是 MSC Λ良务器为本次通话分配的 一个唯一的流水号, 其格式可如表 1所示, 其中, 本地通话标识符占用 8个 比特, 低位的比特 1、 2、 3和比特 4的值用来表示本次通话的本地通话标识 符。 MSC服务器通过该种流水号的形式, 为不同的本地通话分配的本地通话 标识符不同
表 1 本地通话标识符格式
Figure imgf000013_0001
此外 , 该本地通话标识符也可以是与当前呼叫构成本地通话的对端呼叫 的电路识别码 CIC或呼叫标识符(Call Identifier ) , 此处的 CIC即为现有的 电路标识符(用于标志承载在 TDM Transport上的 A口呼叫 ) , 此处的 Call Identifier也是现有的 Call ID (用于标志承载在 IP Transport上的 A口呼叫 )。
Local Call reference ID for IP组成 , 当对端呼叫在 A口基于 TDM传输时 , 使 用 Local Call reference ID for TDM作为本地通话标识符, 其值占用 2个 8位 字节; 而当对端呼叫 A口基于 IP传输时, 使用 Local Call reference ID for IP 作为本地通话标识符, 其值占用 4个 8位字节。 其中 Circuit Identity Codec和 Call Identifier的表示方法为现有技术。
本地通话标识符结构表
6 4 3
Local Call reference ID for TDM octet 1 octet 2
Circuit Identity Code
octet 3
Local Call reference ID for IP octet 1 octet 2 octet 3
Call Identifier
octet 4 octet 5 如图 7所示, 此种情况下, BSC在收到指派请求消息后, 若判断出其中 携带的本地通话标识符为对端呼叫的电路识别码 CIC或呼叫标识符, 则获知 当前呼叫及对端呼叫所属的通话为本地通话。
方式二: 如图 8所示, MSC服务器判断当前呼叫所属的通话是否是本地 通话, 并根据判断结果为本地通话标识赋予相应的值, 然后向通话参与方所 属的 BSC发送携带该本地通话标识的指派请求消息; BSC收到指派请求消息 后, 根据其中本地通话标识的值可获知当前呼叫及对端呼叫是否构成了本地 通话。
在具体实施时, 如表 3所示, 本地通话标识可占用 8个比特, 可使用低 位的比特 1的值来指示通话的状态, 其他的比特位可以预留。 具体地, 当比 特 1取值为 1时, 表示该次通话为本地通话; 当比特 1的取值为 0时, 表示 该次通话不是本地通话, 反之亦可。
表 3 本地通话标识的格式
Figure imgf000014_0001
方式三: 如图 9所示, MSC服务器若判断出当前呼叫所属的通话是本地 通话, 则为当前呼叫及对端呼叫分配相同的呼叫码, 否则为上述二者分配不 同的呼叫码。 其中, 为不属于同一通话的两个呼叫分配的呼叫码不相同, 且 该呼叫码可以但不限于釆用上述表 1所述格式。 然后, 该 MSC服务器在分别 向当前呼叫及对端呼叫所属的 BSC发送的指派请求消息中携带相应的呼叫 码; BSC收到指派请求消息后, 针对其上所有呼叫查找是否存在与当前呼叫 具有相同呼叫码的呼叫, 若有, 则认为带有相同呼叫码的两个呼叫所属的通 话为本地通话, 否则, 认为当前呼叫所属的通话不是本地通话。
上述步骤(2 ) 中, BSC在建立内部用户面连接之前, 还可以包括以下 步骤:
比较当前呼叫的语音编码方式与对端呼叫的语音编码方式, 并根据比较 结果决定是否能建立内部用户面连接(即是否可以使用本地交换功能) 。 此 时会出现 6种情况, 如表 4所示。
表 4 编解码方式对建立内部用户面连接的影响
Figure imgf000014_0002
从上表可以看出, 出现情况 1、 2、 3时, 即当通话双方的语音编码方式 兼容时, BSC可以建立直接传送通话双方用户面语音的传输通道(即内部用 户面连接 ) , 通过该传输通道可以将通话一方的用户面语音直接传送给通话 另一方。
当出现情况 4、 5时, 即通话双方语音编码方式不兼容, 但 BSC内部有 TC时, BSC建立内部用户面连接,即将通话一方的用户面语音先传送给 BSC 内的 TC, 由 TC将收到的用户面语音转换为另一方兼容的编码方式后, 再传 送给通话另一方。
当出现情况 6 时, 即通话双方语音编码方式不兼容, 且 BSC 内部没有 TC时将无法实现本地通话本地交换功能, 即不能建立内部用户面连接。
在上述步骤(2 ) 中, 后续建立内部用户面连接可以分为以下两种情况:
( a ) 在 BSC获知当前呼叫与对端呼叫所属的通话为本地通话后就进行;
( b ) BSC在接收到 MSC服务器向其发送的本地交换命令后再建立。
对于上述情况(a ) , 为了保证后续增值业务(如彩铃业务等)和合法监 听等业务的顺利进行,通话参与方所属的 BSC在完成内部用户面连接建立后, 可通过向 MSC服务器回复指派完成消息告知后者其内部用户面连接已建立, 如图 10所示。 MSC服务器在收到指派完成消息后, 若判断出构成该本地通 话的双方都完成了本地交换的准备, 可以使用本地交换。 此时用户面语音仍 可通过 BSC与 MGW之间的连接传递。 MSC服务器可以在需要时通知 BSC 使用本地通话本地交换功能, 并拆除 BSC与 MGW之间的连接。 具体实施方 式可以是 MSC服务器发送一条消息给 BSC, 告知 BSC开始使用本地交换本 地通话功能, 该消息为一条新增的 MSC服务器发送给 BSC的信令。 BSC收 到该消息后, 使用本地通话本地交换功能, 不再通过 BSC与 MGW之间的连 接传送用户面语音, 并拆除其与 MGW之间的连接。
BSC告知 MSC服务器其内部用户面连接是否已建立的方式可以是在指 派完成消息中添加一本地通话连接完成指示符, 其格式如表 5所示, 本地通 话连接完成指示符可占用 8个比特, 使用低位的比特 1来指示本地交换的状 态, 其他的比特位可以预留。 具体地, 可以使用比特 1来指示 BSC是否准备 好使用本地通话本地交换的功能。 当比特 1取值为 1时, 表示 BSC已经可以 使用本地通话本地交换功能, 当比特 1的取值为 0时, 表示 BSC不能使用本 地通话本地交换功能, 反之亦可。 表 5 本地通话连接完成指示符格式
Figure imgf000016_0001
对于上述情况(b ) , 通话参与方所属的 BSC在获知当前呼叫与对端呼 叫所属的通话为本地通话, 向 MSC服务器回复指派完成消息,告知后者其是 否可以使用本地交换功能。 MSC服务器在收到指派完成消息后, 若判断出上 述本地通话可以使用本地交换功能, 则在后续需要时向该 BSC发送本地交换 命令, 该消息为一条新增的 MSC服务器发送给 BSC的信令。 BSC收到该命 令后, 建立内部用户面连接, 然后开始使用本地通话本地交换功能, 不再通 过 BSC与 MGW之间的连接传送用户面语音,并拆除其与 MGW之间的连接。
本发明提供的支持实现在呼叫建立过程中对本地通话建立本地交换的 BSC设置为:
接收移动交换中心 MSC服务器所发送的指派请求消息,根据所述指派请 求消息判断当前呼叫与对端呼叫所属的通话是否为本地通话;
若所属的通话为本地通话, 则后续建立当前呼叫与对端呼叫间的内容用 户面连接, 从而支持实现该通话双方用户面语音的本地交换。
所述 MSC服务器发送的指派请求消息中可携带本地通话标识符,其中所 述本地通话标识符可以为对端呼叫的电路识别码 CIC或呼叫标识符;
所述 BSC收到所述指派请求消息后, 若判断出其中携带的本地通话标识 符为对端呼叫的电路识别码 CIC或存在两个呼叫使用相同的呼叫标识符, 则 获知当前呼叫及对端呼叫所属的通话为本地通话。
所述 MSC服务器发送的指派请求消息中还可携带被赋予相应的值的本 地通话标识符;
所述 BSC收到所述指派请求消息后,根据其中本地通话标识的值判断当 前呼叫及对端呼叫所属的通话是否为本地通话。
所述 MSC服务器发送的指派请求消息中还可携带相应的呼叫码:若当前 呼叫所属的通话是本地通话, 则为当前呼叫及对端呼叫分配相同的呼叫码, 否则为上述二者分配不同的呼叫码; 其中, 为不属于同一通话的两个呼叫分 配的呼叫码不相同; 所述 BSC收到所述指派请求消息后, 若判断出存在与当前呼叫具有相同 呼叫码的呼叫, 则获知带有相同呼叫码的呼叫所属的通话为本地通话。
所述 BSC可在获知当前呼叫与对端呼叫所属的通话为本地通话后就建立 所述内部用户面连接。
所述 BSC还可设置为:
在完成内部用户面连接建立后 ,通过向所述 MSC服务器回复指派完成消 息告知所述 MSC服务器其内部用户面连接已建立。
所述 BSC还可设置为:
判断主被叫双方的语音编码方式是否兼容, 若兼容或不兼容但所述 BSC 内部有编解码器, 则能使用本地交换功能。
所述 BSC还可设置为:
在获知当前呼叫与对端呼叫所属的通话为本地通话后 ,向所述 MSC月良务 器回复指派完成消息, 告知所述 MSC服务器其是否能使用本地交换功能; 收到所述 MSC服务器发送的所述本地交换命令后, 建立内部用户面连 接, 开始使用本地通话本地交换功能。
本发明提供的支持实现在呼叫建立过程中对本地通话建立本地交换的 MSC服务器设置为:
判断当前呼叫所属的通话是否是本地通话, 并通过指派请求消息告知通 话参与方所属的基站控制器 BSC, 其中,
所述通话参与方为主被叫用户双方或主被叫用户中的任意一方。
所述 MSC服务器若判断出当前呼叫所属的通话是本地通话,则可在向通 话参与方所属的 BSC发送的指派请求消息中携带本地通话标识符,从而使所 述 BSC才艮据其中的所述本地通话标识符来获知当前呼叫及对端呼叫所属的通 话是否为本地通话。
所述本地通话标识符还可为对端呼叫的电路识别码 CIC或呼叫标识符。 所述 MSC服务器还可根据判断结果为本地通话标识赋予相应的值,然后 向通话参与方所属的 BSC发送携带该本地通话标识的指派请求消息,从而使 所述 BSC才艮据其中本地通话标识的值来获知当前呼叫及对端呼叫所属的通话 是否为本地通话。 所述 MSC服务器若判断出当前呼叫所属的通话是本地通话,则还可以为 当前呼叫及对端呼叫分配相同的呼叫码,否则为上述二者分配不同的呼叫码; 其中, 为不属于同一通话的两个呼叫分配的呼叫码不相同; 在分别向当前呼 叫及对端呼叫所属的 BSC发送的指派请求消息中携带相应的呼叫码,从而使 所述 BSC根据其上存在的与当前呼叫具有相同呼叫码的呼叫来获知这两个带 有相同呼叫码的呼叫所属的通话为本地通话。
所述 MSC服务器还可设置为:
接收所述 BSC在完成内部用户面连接建立后回复的指派完成消息, 以获 知所述内部用户面连接已经建立。
所述 MSC服务器还可设置为:
接收所述 BSC在获知当前呼叫与对端呼叫所属的通话为本地通话后回复 的指派完成消息, 以获知其是否能使用本地交换功能;
若判断出所述本地通话能使用本地交换功能, 则在后续需要时向所述
BSC发送本地交换命令, 从而使所述 BSC建立内部用户面连接, 使用本地通 话本地交换功能。
本发明提供的实现在呼叫建立过程中对本地通话建立本地交换的系统, 包括如前面所述的 BSC和所述的 MSC服务器。
当然, 本发明还可有其他多种实施例, 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 工业实用性
釆用本发明后,避免了 Abis口和 A口传输资源的浪费, 实现了本地通话 的本地交换功能, 使得本地通话可以在 BTS内、 BTS簇内、 或者 BSC内就 能完成用户面语音的交换。

Claims

权 利 要 求 书
1、 一种在呼叫建立过程中对本地通话建立本地交换的方法, 包括: 在发送指派请求消息前,移动交换中心服务器 MSC服务器判断当前呼叫 所属的通话是否是本地通话, 并通过所述指派请求消息告知通话参与方所属 的基站控制器 BSC; 以及
所述 BSC若根据所述指派请求消息获知当前呼叫与对端呼叫所属的通话 为本地通话, 则在后续建立当前呼叫与对端呼叫间的内部用户面连接来实现 该通话双方用户面语音的本地交换。
2、 如权利要求 1所述的方法, 其中,
所述通话参与方为主被叫用户双方或主被叫用户中的任意一方。
3、 如权利要求 2所述的方法, 其中,
所述 MSC服务器判断当前呼叫所属的通话是否是本地通话,并通过所述 指派请求消息告知通话参与方所属的 BSC是指: 所述 MSC服务器若判断出 当前呼叫所属的通话是本地通话, 则在向通话参与方所属的 BSC发送的指派 请求消息中携带本地通话标识符;
所述 BSC根据所述指派请求消息获知当前呼叫与对端呼叫所属的通话为 本地通话是指: 所述 BSC收到的指派请求消息中携带所述本地通话标识符。
4、 如权利要求 3所述的方法, 其中,
所述本地通话标识符为对端呼叫的电路识别码 CIC或呼叫标识符; 所述 BSC根据所述指派请求消息获知当前呼叫与对端呼叫所属的通话为 本地通话是指: BSC在收到指派请求消息后, 若判断出其中携带的本地通话 标识符为对端呼叫的电路识别码 CIC或呼叫标识符, 则获知当前呼叫及对端 呼叫所属的通话为本地通话。
5、 如权利要求 2所述的方法, 其中,
所述 MSC服务器判断当前呼叫所属的通话是否是本地通话,并通过所述 指派请求消息告知通话参与方所属的 BSC是指: 所述 MSC服务器根据判断 结果为本地通话标识赋予相应的值, 然后向通话参与方所属的 BSC发送携带 该本地通话标识的指派请求消息; 所述 BSC根据所述指派请求消息获知当前呼叫与对端呼叫所属的通话为 本地通话是指: BSC收到指派请求消息后, 根据其中本地通话标识的值获知 当前呼叫及对端呼叫所属的通话是否为本地通话。
6、 如权利要求 1所述的方法, 其中,
所述 MSC服务器判断当前呼叫所属的通话是否是本地通话,并通过所述 指派请求消息告知通话参与方所属的 BSC是指: 所述 MSC服务器若判断出 当前呼叫所属的通话是本地通话, 则为当前呼叫及对端呼叫分配相同的呼叫 码, 否则为上述二者分配不同的呼叫码; 其中, 为不属于同一通话的两个呼 叫分配的呼叫码不相同; 然后, 所述 MSC服务器在分别向当前呼叫及对端呼 叫所属的 BSC发送的指派请求消息中携带相应的呼叫码;
所述 BSC根据所述指派请求消息获知当前呼叫与对端呼叫所属的通话为 本地通话是指: BSC收到所述指派请求消息后, 若判断出其上存在与当前呼 叫具有相同呼叫码的呼叫, 则获知这两个带有相同呼叫码的呼叫所属的通话 为本地通话。
7、 如权利要求 1所述的方法, 其中,
在所述 BSC建立所述内部用户面连接的步骤之前, 所述方法还包括: 所 述 BSC判断是否能使用本地交换功能, 该步骤包括:
判断主被叫双方的语音编码方式是否兼容, 若兼容或不兼容但所述 BSC 内部有编解码器, 则能使用本地交换功能;
否则不具有本地交换功能。
8、 如权利要求 1~7中任意一项所述的方法, 其中,
所述 BSC在后续建立内部用户面连接是指: 所述 BSC在获知当前呼叫 与对端呼叫所属的通话为本地通话后就建立所述内部用户面连接。
9、 如权利要求 8所述的方法, 所述方法还包括:
所述 BSC在完成内部用户面连接建立后, 通过向所述 MSC服务器回复 指派完成消息告知所述 MSC服务器其内部用户面连接已建立。
10、 如权利要求 1~7中任意一项所述的方法, 其中,
所述 BSC在后续建立内部用户面连接是指: 所述 BSC在获知当前呼叫 与对端呼叫所属的通话为本地通话后, 向所述 MSC服务器回复指派完成消 息, 告知所述 MSC服务器其是否能使用本地交换功能;
所述 MSC服务器在收到所述指派完成消息后,若判断所述本地通话能使 用本地交换功能, 则在后续需要时向所述 BSC发送本地交换命令; 以及 所述 BSC收到所述本地交换命令后, 建立内部用户面连接, 然后开始使 用本地通话本地交换功能。
11、 一种支持实现在呼叫建立过程中对本地通话建立本地交换的基站控 制器 BSC, 其设置为:
接收移动交换中心 MSC服务器所发送的指派请求消息,根据所述指派请 求消息判断当前呼叫与对端呼叫所属的通话是否为本地通话;
若所属的通话为本地通话, 则建立当前呼叫与对端呼叫间的内容用户面 连接, 从而实现该通话双方用户面语音的本地交换。
12、 如权利要求 11所述的 BSC, 其中,
所述 MSC服务器发送的指派请求消息中携带本地通话标识符。
13、 如权利要求 12所述的 BSC, 其中,
所述本地通话标识符为对端呼叫的电路识别码 CIC或呼叫标识符; 所述 BSC收到所述指派请求消息后, 若判断出其中携带的本地通话标识 符为对端呼叫的电路识别码 CIC或存在两个呼叫使用相同的呼叫标识符, 则 获知当前呼叫及对端呼叫所属的通话为本地通话。
14、 如权利要求 11所述的 BSC, 其中,
所述 MSC服务器发送的指派请求消息中携带被赋予相应的值的本地通 话标识符;
所述 BSC收到所述指派请求消息后,根据其中本地通话标识的值判断当 前呼叫及对端呼叫所属的通话是否为本地通话。
15、 如权利要求 11所述的 BSC, 其中,
所述 MSC服务器发送的指派请求消息中携带相应的呼叫码:若当前呼叫 所属的通话是本地通话, 则为当前呼叫及对端呼叫分配相同的呼叫码, 否则 为上述二者分配不同的呼叫码; 其中, 为不属于同一通话的两个呼叫分配的 呼叫码不相同;
所述 BSC收到所述指派请求消息后, 若判断出存在与当前呼叫具有相同 呼叫码的呼叫, 则获知带有相同呼叫码的呼叫所属的通话为本地通话。
16、 如权利要求 11~15中任意一项所述的 BSC, 其中,
所述 BSC在获知当前呼叫与对端呼叫所属的通话为本地通话后就建立所 述内部用户面连接。
17、 如权利要求 11所述的 BSC, 所述 BSC还设置为:
在完成内部用户面连接建立后 ,通过向所述 MSC服务器回复指派完成消 息告知所述 MSC服务器其内部用户面连接已建立。
18、 如权利要求 11所述的 BSC, 所述 BSC还设置为:
判断主被叫双方的语音编码方式是否兼容, 若兼容或不兼容但所述 BSC 内部有编解码器, 则能使用本地交换功能。
19、 如权利要求 11~15中任意一项所述的 BSC, 所述 BSC还设置为: 在获知当前呼叫与对端呼叫所属的通话为本地通话后,向所述 MSC服务 器回复指派完成消息, 告知所述 MSC服务器其是否能使用本地交换功能; 收到所述 MSC服务器发送的所述本地交换命令后, 建立内部用户面连 接, 开始使用本地通话本地交换功能。
20、 一种支持实现在呼叫建立过程中对本地通话建立本地交换的移动交 换中心服务器 MSC服务器, 所述 MSC服务器设置为:
判断当前呼叫所属的通话是否是本地通话, 并通过指派请求消息告知通 话参与方所属的基站控制器 BSC, 其中,
所述通话参与方为主被叫用户双方或主被叫用户中的任意一方。
21、 如权利要求 20所述的 MSC服务器, 其中,
所述 MSC服务器若判断出当前呼叫所属的通话是本地通话,则在向通话 参与方所属的 BSC发送的指派请求消息中携带本地通话标识符,从而使所述 BSC才艮据其中的所述本地通话标识符来获知当前呼叫及对端呼叫所属的通话 是否为本地通话。
22、 如权利要求 21所述的 MSC服务器, 其中,
所述本地通话标识符为对端呼叫的电路识别码 CIC或呼叫标识符。
23、 如权利要求 20所述的 MSC服务器, 其中,
所述 MSC服务器根据判断结果为本地通话标识赋予相应的值,然后向通 话参与方所属的 BSC发送携带该本地通话标识的指派请求消息,从而使所述 BSC根据其中本地通话标识的值来获知当前呼叫及对端呼叫所属的通话是否 为本地通话。
24、 如权利要求 20所述的 MSC服务器, 其中,
所述 MSC服务器若判断出当前呼叫所属的通话是本地通话,则为当前呼 叫及对端呼叫分配相同的呼叫码, 否则为上述二者分配不同的呼叫码; 其中, 为不属于同一通话的两个呼叫分配的呼叫码不相同; 在分别向当前呼叫及对 端呼叫所属的 BSC发送的指派请求消息中携带相应的呼叫码, 从而使所述 BSC根据其上存在的与当前呼叫具有相同呼叫码的呼叫来获知这两个带有相 同呼叫码的呼叫所属的通话为本地通话。
25、 如权利要求 20所述的 MSC服务器, 所述 MSC服务器还设置为: 接收所述 BSC在完成内部用户面连接建立后回复的指派完成消息, 以获 知所述内部用户面连接已经建立。
26、 如权利要求 24所述的 MSC服务器, 所述 MSC服务器还设置为: 接收所述 BSC在获知当前呼叫与对端呼叫所属的通话为本地通话后回复 的指派完成消息, 以获知其是否能使用本地交换功能;
若判断出所述本地通话能使用本地交换功能, 则在后续需要时向所述 BSC发送本地交换命令, 从而使所述 BSC建立内部用户面连接, 使用本地通 话本地交换功能。
27、 一种实现在呼叫建立过程中对本地通话建立本地交换的系统, 包括 如权利要求 11-19所述的基站控制器 BSC和如权利要求 20-26所述的移动交 换中心服务器 MSC服务器。
PCT/CN2010/071029 2009-03-13 2010-03-12 一种在呼叫建立过程中对本地通话建立本地交换的方法、设备及系统 WO2010102585A1 (zh)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1143442A (zh) * 1994-03-09 1997-02-19 诺基亚电信公司 移动通信系统及呼叫控制方法
US20030086418A1 (en) * 2001-11-06 2003-05-08 Mcintosh Chris P. Intelligent private 3G network and method of operating the same
CN101159905A (zh) * 2007-11-07 2008-04-09 华为技术有限公司 基站控制器内实现本地交换方法、核心网设备及网络系统
CN101309505A (zh) * 2007-05-15 2008-11-19 华为技术有限公司 无线通信系统中语音业务路由方法及其系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1143442A (zh) * 1994-03-09 1997-02-19 诺基亚电信公司 移动通信系统及呼叫控制方法
US20030086418A1 (en) * 2001-11-06 2003-05-08 Mcintosh Chris P. Intelligent private 3G network and method of operating the same
CN101309505A (zh) * 2007-05-15 2008-11-19 华为技术有限公司 无线通信系统中语音业务路由方法及其系统
CN101159905A (zh) * 2007-11-07 2008-04-09 华为技术有限公司 基站控制器内实现本地交换方法、核心网设备及网络系统

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