WO2011020248A1 - 一种扁平化移动通信网络的切换系统及方法 - Google Patents

一种扁平化移动通信网络的切换系统及方法 Download PDF

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Publication number
WO2011020248A1
WO2011020248A1 PCT/CN2009/073412 CN2009073412W WO2011020248A1 WO 2011020248 A1 WO2011020248 A1 WO 2011020248A1 CN 2009073412 W CN2009073412 W CN 2009073412W WO 2011020248 A1 WO2011020248 A1 WO 2011020248A1
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Prior art keywords
ebts
handover
destination
source
core network
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PCT/CN2009/073412
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English (en)
French (fr)
Inventor
王欣晖
李靖
Original Assignee
中兴通讯股份有限公司
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Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to PCT/CN2009/073412 priority Critical patent/WO2011020248A1/zh
Publication of WO2011020248A1 publication Critical patent/WO2011020248A1/zh

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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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points

Definitions

  • the present invention relates to a flattened mobile communication network, and more particularly to a handover system and method for a flat mobile communication network.
  • FIG. 1 is a schematic diagram of a network architecture and an interface of a conventional Global System for Mobile Communications (GSM) system.
  • GSM Global System for Mobile Communications
  • the traditional GSM network mainly includes three layers: the core network, the base station controller (BSC), and the base station (Base Transceiver Station, BTS).
  • BSC base station controller
  • BTS Base Transceiver Station
  • one core network administers a plurality of base station controllers
  • the base station control 1 and the base station controller 2 are shown in the figure
  • one base station controller administers a plurality of base stations, wherein the base station controller 1 administers the base station 11 and the base station 12, and the base station controls The base station 21 and the base station 22 are shown; one base station further administers a plurality of mobile terminals (MSs).
  • MSs mobile terminals
  • one base station each administers one MS as an example
  • the base station 11 administers the mobile terminal 111
  • the base station 12 governs the mobile terminal 121
  • the base station 21 governs the mobile terminal 211 and the base station 22 to govern the mobile terminal 221.
  • both the BSC and the BTS belong to the Base Station System (BSS).
  • BSS Base Station System
  • the interface between the core network and the BSC is called the A interface.
  • the interface between the BSC and the BTS is called the Abis interface.
  • the interface between the BTS and the MS is called the Um interface.
  • the core network, BSC and BTS work together to provide complete mobile voice service capabilities to the MS.
  • the handover process occurs in the dedicated mode of the mobile terminal, that is, the mobile terminal transfers from the BTS that currently provides the wireless service (or the BTS that serves the mobile terminal before the handover, called the source BTS) Another BTS that provides wireless service (or BTS that serves mobile terminals after handover, is called the destination BTS).
  • switching can be divided into the following three cases:
  • the source BTS belongs to a certain BSS system, and the destination BTS belongs to another BSS system.
  • the mobile terminal moves from the source BTS to the destination BTS, causing the BSS providing the service to also occur. Variety.
  • the source BTS belongs to a certain BSS system, and the destination BTS also belongs to the BSS system.
  • the mobile terminal moves from the source BTS to the destination BTS only to cause the BTS to provide the service. A change has occurred, but the BSC system has not changed.
  • the source BTS and the destination BTS are the same BTS, and the mobile terminal transfers from one radio channel of the BTS to another radio channel of the BTS, and the mobile process only leads to providing services.
  • the BTS radio channel has changed, but the BSS system has not changed.
  • FIG. 5 is a schematic diagram of an existing flat GSM network architecture and interface.
  • the existing flattened GSM network mainly includes two layers of a core network and an enhanced base station (eBTS), wherein an interface between the core network and the enhanced base station is an A interface, and the enhanced base station and the enhanced base station are The interface between the mobile terminals is a Um interface, and a new interface is defined between the enhanced base stations, which is called an enhanced inter-base station interface, and can be used for interaction between the enhanced base station and the enhanced base station.
  • eBTS enhanced base station
  • each enhanced base station is shown by the enhanced base station 1, the enhanced base station 2, the enhanced base station 3, and the enhanced base station 4, and each mobile terminal is shown by the mobile terminal 11, the mobile terminal 21, the mobile terminal 31, and the mobile terminal 11. .
  • the mobile terminal still has a handover procedure in the dedicated mode, that is, the mobile terminal transfers from the eBTS that currently provides the wireless service (or the eBTS serving the mobile terminal before the handover, called the source eBTS) to Another eBTS providing wireless service (or eBTS serving the mobile terminal after handover, referred to as the destination eBTS), or the mobile terminal transferring from one wireless channel of the eBTS to another wireless channel providing the wireless service of the same eBTS .
  • the base station controller since the base station controller does not exist in the flat network, after the GSM network is flattened, the partial handover process will change.
  • the inter-BSS handover process shown in Figure 2 will be transformed into inter-eBTS handover in a flattened network.
  • the switched source eBTS and destination eBTS are directly connected to the core network.
  • the functions of the original BSC such as radio resource management and call control will be distributed to each eBTS.
  • the flat GSM network can still use the original A-port signaling flow to complete the handover. The content and quantity of signaling can be kept unchanged.
  • the inter-BTS handover procedure in the BSS as shown in FIG. 3 also shifts to inter-eBTS handover in the flattened network.
  • the switched source eBTS and the destination eBTS are directly connected to the core network.
  • the difference between the GSM network and the GSM network is that the switching source BSC and the switching destination BSC are both the same BSC, and after the network is flattened, the source eBTS and the destination eBTS will not be the same eBTS. Therefore, after the network is flattened, the original BSS handover will be changed to similar to the original BSS handover.
  • the flat GSM network still uses the original BSS handover procedure to complete the handover, the A interface interacts. The number of signaling will increase significantly, and the signaling processing load of the core network will increase accordingly.
  • the handover process in the BTS does not change substantially, and is still switched within the eBTS.
  • the source eBTS and the destination eBTS are the same eBTS, and the mobile terminal transfers from the certain wireless channel of the eBTS to the eBTS.
  • the handover process only results in a change in the wireless channel of the eBTS providing the service.
  • the technical problem to be solved by the present invention is to provide a switching system and method for flattening a mobile communication network for flattening handover of terminals between eBTSs in a mobile communication network.
  • the present invention provides a method for switching a flat mobile communication network, which is used to complete handover of a mobile terminal in an enhanced base station (eBTS) in the flat mobile communication network, the method comprising:
  • the source eBTS of the handover completes the information exchange of the handover notification with the destination eBTS of the handover through the enhanced inter-base station interface;
  • the source eBTS instructs the mobile terminal to perform the handover and the A-port connection for the handover is completed between the destination eBTS and the core network.
  • the step of the source eBTS and the destination eBTS to complete the information exchange includes: the source eBTS sending a handover request message to the destination eBTS to perform the information interaction; After receiving the handover request message and confirming that the handover is possible, the destination eBTS sends a handover request acknowledgement message to the source eBTS to complete the information interaction.
  • the handover request message carries a handover reference number and capability information of the mobile terminal; and the handover request acknowledgement message carries the destination channel information of the handover.
  • the step of completing the A port connection for the handover between the destination eBTS and the core network includes:
  • the destination eBTS After the source eBTS indicates that the mobile terminal performs the handover, the destination eBTS sends a conversion request message to the core network to perform the switched A port connection;
  • the core network sends a conversion request acknowledgement message to the destination eBTS to complete the A port connection.
  • the step of completing the A port connection for the handover between the destination eBTS and the core network includes:
  • the destination eBTS After the source eBTS and the destination eBTS complete the information exchange of the handover notification, the destination eBTS sends a channel request message to the core network to perform the A-port connection of the handover; The destination eBTS sends a channel request acknowledgement message to complete the A port connection.
  • the conversion request message or the channel request message includes connection information allocated by the destination eBTS for the handover; the conversion request acknowledgement message or the channel request acknowledgement message includes connection information allocated by the core network for the handover. .
  • the destination eBTS further notifies the source eBTS to release resources for the mobile terminal.
  • the present invention also provides a switching system for a flat mobile communication network, which is used for completing handover of a mobile terminal in an enhanced base station (eBTS) in the flat mobile communication network, and the system includes The source eBTS, the destination eBTS, and the core network of the handover, where:
  • the source eBTS is configured to perform information exchange between the enhanced inter-base station interface and the destination eBTS to complete the handover notification, and instruct the mobile terminal to perform the handover;
  • the destination eBTS is configured to complete the information interaction with the source eBTS, and the core network A port connection for the switching is completed between;
  • the core network is configured to complete the connection with the destination eBTS.
  • the source eBTS is configured to send a handover request message to the destination eBTS to perform the information interaction; the destination eBTS is configured to receive the handover request message and confirm that the handover can be performed, to the The source eBTS sends a handover request acknowledgement message to complete the information interaction.
  • the destination eBTS is configured to: after the source eBTS instructs the mobile terminal to perform the handover, send a conversion request message to the core network to perform the A-port connection of the handover; Transmitting a conversion request acknowledgement message to the destination eBTS to complete the switched A port connection.
  • the destination eBTS is configured to send a channel request message to the core network to perform the switched A port connection after the source eBTS completes the information interaction; the core network is configured to The destination eBTS sends a channel request acknowledgement message to complete the switched A port connection.
  • the destination eBTS is further configured to notify the source eBTS to release resources for the mobile terminal after the handover.
  • the terminal in the flat mobile communication network needs to perform the handover between the eBTSs
  • the information is exchanged by using the interface between the eBTSs, so that part of the signaling directly passes the eBTS.
  • Interacting with the interface between the eBTS thereby realizing the handover of the terminal between the eBTSs in the flat mobile communication network, and greatly reducing the core network and the eBTS compared with the switching between the BTSs in the BSS in the ordinary mobile communication network in the prior art.
  • the number of signaling between port A BRIEF abstract
  • FIG. 1 is a schematic diagram of an architecture and an interface of a GSM network in the prior art
  • FIG. 2 is a schematic diagram of switching between BSSs in a conventional GSM network
  • FIG. 3 is a schematic diagram of switching between BTSs in a BSS in a conventional GSM network
  • Figure 4 is a schematic diagram of switching within a BTS in a conventional GSM network
  • 5 is a schematic diagram of an architecture and an interface of a flattened GSM network in the prior art
  • 6 is a schematic diagram of handover between eBTSs in a flattened GSM network
  • Figure 7 is a schematic diagram of another handover between eBTSs in a flattened GSM network
  • Figure 8 is a schematic diagram of handover within an eBTS in a flat GSM network
  • FIG. 9 is a schematic flowchart of a handover signaling process according to a first embodiment of the present invention.
  • FIG. 10 is a schematic flowchart of a handover signaling process according to a second embodiment of the present invention.
  • the handover method provided by the present invention is an information interaction and interaction between the source eBTS and the destination eBTS through the enhanced inter-base station interface between the eBTSs when the inter-eBTS handover occurs in the flattened mobile communication network, such as the flattened GSM network.
  • the information includes handover requirements and handover conditions.
  • the handover requirement mainly refers to the source eBTS notifying the destination eBTS that the MS needs to switch to the eBTS.
  • the handover condition mainly refers to the destination eBTS notifying the source eBTS that the handover can be performed and the required wireless for handover. Channel information.
  • the target eBTS After the target eBTS learns that the MS needs to switch in or confirms that the MS has been handed in, it interacts with the core network through the A interface to establish a connection with the core network for the handover; between the eBTS and the core network.
  • the interaction process may be performed before the MS switches to the destination eBTS, or after the MS switches to the destination eBTS.
  • the destination eBTS After the MS completes the handover and the connection between the destination eBTS and the core interface of the core network is established, the destination eBTS notifies the source eBTS to release the resources for the MS through the enhanced inter-basement interface.
  • the flat mobile communication network comprises a source eBTS, a destination eBTS and a core network, wherein:
  • the source eBTS When the MS needs to perform the handover between the eBTSs, the source eBTS initiates a handover request message carrying the handover request to the destination eBTS, and after receiving the handover confirmation of the destination eBTS reply, sends a handover command message to the MS; the source eBTS is received. After the handover sent by the eBTS succeeds or the information of the resource is released, all the resources originally used for the handover MS are released.
  • the destination eBTS After the destination eBTS receives the handover request from the source eBTS, if the MS can switch to the eBTS, Then, the source eBTS handover confirmation is returned, and the handover conditions such as the destination radio channel information required for completing the handover are performed.
  • the destination eBTS needs to interact with the core network through the A interface information to establish an A port connection between the destination eBTS and the core network for the call; this process may be performed before the MS switches to the destination eBTS, or may be in the MS. It is performed after switching to the destination eBTS. After completing the connection establishment of the A interface, the eBTS notifies the source eBTS to release all resources for the MS after the MS handover is completed to the destination eBTS.
  • the core network After receiving the information of the destination eBTS for the purpose of switching the MS, the core network establishes an A port connection with the destination eBTS for the call, and releases the source eBTS for the call after the MS switches to the destination eBTS.
  • the A port is connected.
  • the flat GSM network of the present invention is a typical application of a flat mobile communication network, and does not constitute a limitation on the flat mobile communication network of the present invention; the flat mobile communication network of the present invention may also be other flat mobile communication. Networks such as LTE flat networks.
  • the information is exchanged between the eBTS interfaces, so that part of the signaling directly interacts with the information between the eBTS and the eBTS, thereby not only realizing the flat mobile communication network. Switching between eBTSs and greatly reducing the amount of signaling required by port A.
  • each network element entity in the mobile communication network for example, a flattened GSM network
  • the handover mode can be implemented in the embodiment of the present invention
  • the connection relationship (or message interaction relationship) of each network element entity will be described in detail later when the method of the present invention is described.
  • the flattened GSM network of the present invention includes: MS (MS for handover), eBTSl
  • source eBTS source eBTS
  • eBTS2 destination eBTS
  • core network core network
  • a handover method is first provided, where the source eBTS initiates a handover to the destination eBTS, and after the destination eBTS acknowledges the handover request, the source eBTS sends a handover command message to the MS. Purpose After the MS switches in, the eBTS notifies the core network to transfer the connection of the A port from the source eBTS to the destination eBTS. Purpose The eBTS notification source eBTS releases the resources for the MS.
  • the eBTS1 when a handover between the eBTS and the eBTS is required (by eBTS1 to eBTS2), the eBTS1 sends a handover request message to the eBTS2, informing the eBTS2 that the MS needs to switch to the eBTS2.
  • the capability information of the MS such as the handover reference number and the coding mode supported by the MS may be included in the handover request message.
  • the eBTS2 determines whether the MS can perform handover, and determines whether the content includes the eBTS2, whether there is an idle channel or the like. If the eBTS2 determines that the MS can switch to the eBTS2, it returns a handover request acknowledgement message to the eBTS1, which contains the destination radio channel information required for the MS handover, such as channel frequency, time slot and speech coding. Preferably, if the eBTS2 determines that the MS cannot switch to the eBTS2, the message is returned to the eBTS1, and the message may be accompanied by the reason for rejecting the handover. For example, when the eBTS2 finds that there is no available channel, the message includes the handover request. The reason for the rejection is that there is no available channel, etc.
  • the eBTS1 After receiving the handover request acknowledgement message replied by the eBTS2, the eBTS1 sends a handover command message to the MS through the Um interface, instructing the MS to perform handover, and the handover command message may be identical to the handover command message in the traditional GSM network.
  • the MS After receiving the handover command message of the eBTS1, the MS performs a handover operation, switches to the eBTS2, and sends a handover complete message to the eBTS2 after the handover succeeds.
  • the handover procedure of the MS may be identical to the handover procedure in the traditional GSM network.
  • the eBTS2 After receiving the handover complete message sent by the MS, the eBTS2 allocates an A-port connection for the handover between the eBTS2 and the core network, and therefore allocates an A-port for transmitting the voice voice on the new user plane connection of the eBTS2.
  • the connection information includes the IP address and the UDP port number of the eBTS2, and sends a conversion request message to the core network, where the content of the conversion request message includes indication information that the MS has switched from eBTS1 to eBTS2, and the allocated information for the MS
  • the conversion request message carries the voice coding mode used by the MS.
  • the core network After receiving the conversion request message, the core network uses the eBTS2 and the core network for the call.
  • the A port connection has not been established, so the A port connection information of the core network for the call is allocated, including the IP address and UDP port number of the core network.
  • the eBTS2 conversion request confirmation message is returned.
  • the content of the conversion request confirmation message needs to include the A port connection information of the core network allocated to the call, including the IP address and UDP port number of the core network.
  • the core network utilizes the A port connection information of the core network just allocated, including the IP address and UDP port number of the core network, and the A port connection information of the eBTS2 for the MS voice carried by the eBTS2 in the conversion request message, including the eBTS2
  • the two sets of information, IP address and UDP port number, are used to establish the connection of the eBTS2 user plane. After the eBTS2 user plane connection is established, the user plane connection of the original eBTS1 is no longer used, and the user plane connection of the eBTS2 is changed.
  • the eBTS2 After receiving the conversion request confirmation message of the core network, the eBTS2 uses the A port connection information that is provided in the message and is allocated to the core network used by the call, where the IP address and the UDP port number of the core network are connected as new user planes. Information, the voice is transmitted on the new user plane connection. And sending a clear command message to the eBTS1, the clear command message is used to notify the eBTS1 that the MS has successfully switched to the eBTS2, and can release related resources for the MS in the eBTS1, including the Um interface radio resource of the eBTS1 and the ground resource of the A interface. .
  • the eBTS1 After receiving the clear command message sent by the eBTS2, the eBTS1 releases the related resources for the MS, including the Um interface radio resource of the eBTS1 and the ground resource of the A interface. Preferably, after the resource is released, the eBTS1 sends a clearing completion message to the eBTS2, and the clearing completion message is used to notify the eBTS2 that the resources for the MS in the eBTS1 have been completely released.
  • FIG. 9 is a flow chart of the handover between the eBTS and the eBTS in the flattened GSM network according to the embodiment of the present invention, and the MS switches from the source eBTS to the destination eBTS. As shown in Figure 9, the process mainly includes the following steps:
  • Step S901 The source eBTS sends a handover request (Handover Request) message to the destination eBTS, and carries the capability information of the MS to notify the destination eBTS, indicating that there is a handover requirement that the MS needs to switch to the eBTS.
  • Handover Request handover request
  • Step S902 the destination eBTS receives the handover request message and confirms that the handover can be performed according to the capability information, and sends a handover request acknowledgement (ACKover Request ACK) message to the source eBTS. Informing the source eBTS that the handover can be performed, and carrying handover conditions such as destination channel information for handover, etc.;
  • ACKover Request ACK handover request acknowledgement
  • Step S903 After receiving the handover request acknowledgement message, the source eBTS sends a handover command (Handover Command) message to the MS, where the handover command message carries the destination channel information; the process is the same as in the traditional GSM network;
  • Step S904 after receiving the handover command message and completing the handover according to the destination channel information, the MS sends a Handover Complete message to the destination eBTS.
  • the process is the same as that in the traditional GSM network.
  • Step S905 After receiving the handover complete message, the destination eBTS sends a handover request (Switch Request) message to the core network, where the conversion request message is used to notify the core network that the MS has switched from the source eBTS to the eBTS, and has the destination eBTS allocation. Giving the IP address and the UDP port number of the handover; Step S906, after receiving the conversion request message, the core network sends a Switch Request ACK message to the destination according to the IP address and the UDP port number assigned to the handover by the eBTS.
  • Switch Request handover request
  • the eBTS the conversion request confirmation message is used to notify the destination eBTS of the IP address and UDP port number of the core network used for the handover; and establish a switched connection for the MS according to the IP address and the UDP port number of the core network.
  • Step S907 After receiving the conversion request acknowledgement message, the eBTS sends a Clear Command message to the source eBTS, where the clear command message is used to notify the source eBTS to release the resource originally used for the MS.
  • Step S908 After the source eBTS receives the clear command message, the sending clear is completed (Clear
  • the Complete message is sent to the destination eBTS, which is a preference for informing the destination eBTS source eBTS that the resource release has been completed.
  • the A-port connection established between the eBTS2 and the core network for the call in the first embodiment is performed after the MS handover is completed, but the present invention is not limited thereto, and the eBTS2 is The A port connection with the core network for the handover can also be established before the MS switches to eBTS2.
  • the eBTS1 sends a handover request message to the eBTS2, informing the eBTS2 that the MS needs to switch to the eBTS2.
  • the capability information of the MS such as a handover reference number and an encoding mode supported by the MS, may be included in the handover request message.
  • the eBTS2 After receiving the handover request message, the eBTS2 determines whether the MS can perform handover, and determines whether the content includes the eBTS2, whether there is an idle channel or the like. If the eBTS2 determines that the MS can switch to the eBTS2, it returns a handover request acknowledgement message to the eBTS1, where the handover request acknowledgement message includes the destination radio channel information required for the MS switch, such as the channel frequency point, the time slot, and the voice coding mode.
  • the handover request rejection message is returned to the eBTS1, and the handover request rejection message may have a reason for rejecting the handover, for example, when the eBTS2 finds that there is no available channel at present, the handover request The reason why the rejection request includes the handover request rejection is that there is no available channel.
  • the eBTS2 sends a channel request message to the core network, and the channel request message includes the A port connection information of the eBTS2 allocated to the call to be hacked, including the IP address and UDP port number of the eBTS2.
  • the core network After receiving the channel request message, the core network records the A port connection information of the eBTS2 assigned by the eBTS2 to the incoming call, including the IP address and UDP port number of the eBTS2. In addition, the core network allocates the A port connection information of the core network for the call, including the IP address and the UDP port number of the core network, and returns a channel request confirmation message to the eBTS2, where the channel request confirmation message carries the core network.
  • a port connection information for the call where the core network includes an IP address and a UDP port number.
  • the eBTS1 After receiving the handover request acknowledgement message replied by the eBTS2, the eBTS1 sends a handover command message to the MS through the Um interface, instructing the MS to perform handover, and the handover command message may be identical to the handover command message in the traditional GSM network.
  • the MS After receiving the handover command message sent by the eBTS1, the MS performs the handover action, switches to the eBTS2, and sends a handover completion message to the eBTS2 after the handover succeeds.
  • the handover procedure of the MS may be identical to the handover procedure in the traditional GSM network.
  • the eBTS2 After receiving the handover complete message sent by the MS, the eBTS2 sends a conversion request message to the core network, where the content of the conversion request message includes indication information that the MS has switched from eBTS1 to eBTS2.
  • the conversion request message carries a voice coding mode used by the MS.
  • the core network After receiving the conversion request message, the core network replies to the eBTS2 with a conversion request confirmation message, and The user plane connection of the original eBTS1 is no longer used, and the user plane connection of the eBTS2 is changed.
  • the eBTS2 After receiving the conversion request acknowledgement message sent by the core network, the eBTS2 uses the A port connection information of the core network allocated to the call provided in the previous message, including the IP address and UDP port number of the core network, as a new user. Face connection information, transmitting voice on the new user plane connection.
  • the clear command message is sent to the eBTS1, and the clear command message is used to notify the eBTS1 that the MS has successfully switched to the eBTS2, and the related resources for the MS in the eBTS1, including the Um interface radio resource of the eBTS1 and the ground resource of the A interface.
  • the eBTS1 After receiving the clear command message sent by the eBTS2, the eBTS1 releases the related resources for the MS, including the Um interface radio resource of the eBTS 1 and the terrestrial resource of the A interface. Preferably, after the resource is released, the eBTS 1 sends a clearing completion message to the eBTS2, and the clearing completion message is used to notify the eBTS2 that the resources for the MS in the eBTS1 have been completely released.
  • FIG. 10 is a flowchart of another handover between the eBTS and the eBTS in the GSM network in the flattened embodiment of the present invention, and the MS switches from the source eBTS to the destination eBTS. As shown in FIG. 10, the process mainly includes the following steps:
  • Step SlOa the source eBTS sends a handover request message to the destination eBTS, carrying the capability information of the MS, to notify the destination eBTS, and the MS needs to switch to the eBTS;
  • Step SlOb the destination eBTS receives the handover request message and confirms that the handover can be performed according to the capability information, and sends a handover request acknowledgement message to the source eBTS to inform the source eBTS that the handover can be performed with the destination channel information for handover;
  • Step SlOc the destination eBTS sends a channel request message to the core network, where the channel request message carries the IP address and the UDP port number assigned to the switching MS by the destination eBTS;
  • Step SlOd after receiving the channel request message, the core network sends a channel request confirmation message to the destination eBTS, where the message carries the IP address and UDP port number assigned by the core network to the switching MS;
  • Step S10 After receiving the handover request acknowledgement message, the source eBTS sends a handover command message to the MS, instructing the MS to perform handover; the handover command information carries the destination channel information; the process is the same as in the traditional GSM network;
  • Step S10f after the MS receives the handover command message and completes handover according to the destination channel information, The handover completion message is sent to the destination eBTS, and the process is the same as that in the traditional GSM network.
  • Step SlOh after receiving the conversion request message, the core network sends a conversion request confirmation message to the destination eBTS, indicating that the core network has completed the conversion from the source eBTS to the destination eBTS;
  • Step S10 After receiving the conversion request message, the destination eBTS establishes a handover connection according to the IP address and the UDP port number allocated by the core network, and sends a clear command message to the source eBTS, where the clear command message is used to notify the source eBTS to release the original Resources for the MS;
  • Step SlOj after receiving the clear command message, the source eBTS sends a clear complete message to the destination eBTS; the message is a preference for informing the destination eBTS source that the eBTS has completed resource release.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any particular combination of hardware and software.

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Description

一种扁平化移动通信网络的切换系统及方法
技术领域
本发明涉及扁平化移动通信网络， 尤其涉及一种扁平化移动通信网络的 切换系统及方法。
背景技术
图 1为传统全球移动通信系统（ Global System for Mobile Communications, GSM ) 的网络构架及接口示意图。 如图 1所示， 传统的 GSM网络主要包括 核心网、基站控制器（ Base Station Controller, BSC )和基站（ Base Transceiver Station, BTS )三层。 其中， 一个核心网管辖若干基站控制器， 图中以基站控 制 1和基站控制器 2示出； 一个基站控制器管辖若干基站， 图中以基站控制 器 1管辖基站 11和基站 12, 以及基站控制器 2管辖基站 21和基站 22示出； 一个基站又管辖若干移动终端（Mobile Station, MS ) , 图中以一个基站各管 辖一个 MS为例， 基站 11管辖移动终端 111 , 基站 12管辖移动终端 121 , 基 站 21管辖移动终端 211以及基站 22管辖移动终端 221。
在传统的 GSM网络的网络架构中， BSC和 BTS都属于基站系统（ Base Station System, BSS )。 核心网和 BSC之间的接口称为 A接口， BSC与 BTS 间的接口称为 Abis接口， BTS与 MS间的接口称为 Um接口。 核心网、 BSC 和 BTS协同工作， 向 MS提供完整的移动话音服务功能。
在三层构架的 GSM网络中，移动终端在专用模式下会发生切换过程， 即 移动终端从当前提供无线服务的 BTS(或者说切换前服务于移动终端的 BTS, 被称为源 BTS )转移到另一个提供无线服务的 BTS (或者说切换后服务于移 动终端的 BTS, 被称为目的 BTS ) 。
一般来说， 在传统的 GSM网络中， 可以将切换分为以下 3种情况：
( l ) BSS间切换， 如图 2所示， 源 BTS属于某个 BSS系统， 目的 BTS 属于另外一个 BSS系统， 移动终端从源 BTS转移到目的 BTS的移动过程导 致了提供服务的 BSS也发生了变化。 ( 2 ) BSS内 BTS间切换， 如图 3所示， 源 BTS属于某个 BSS系统， 目 的 BTS也属于这个 BSS系统， 移动终端从源 BTS转移到目的 BTS的移动过 程只是导致了提供服务的 BTS发生变化， 但 BSC系统未发生变化。
( 3 ) BTS内切换， 如图 4所示， 源 BTS与目的 BTS是同一个 BTS, 移 动终端从该 BTS的某个无线信道转移到该 BTS的另外一个无线信道，移动过 程只是导致了提供服务的 BTS无线信道发生了变化，但 BSS系统未发生变化。
图 5为现有的扁平化 GSM网络构架及接口示意图。如图 5所示，现有的 扁平化 GSM 网络主要包括核心网和增强型基站 （ Enhanced Base Station , eBTS )两层， 其中核心网与增强型基站之间的接口为 A接口， 增强型基站与 移动终端之间的接口为 Um接口， 增强型基站之间定义了新的接口， 称为增 强型基站间接口， 可以用于增强型基站与增强型基站之间进行交互。 图中以 增强型基站 1、 增强型基站 2、 增强型基站 3及增强型基站 4示出各增强型基 站， 以移动终端 11、 移动终端 21、 移动终端 31及移动终端 11示出各移动终 端。
核心网和增强型基站协同工作， 向 MS提供完整的移动话音服务功能。 在扁平化的 GSM网络中，移动终端在专用模式下仍会发生切换过程， 即移动 终端从当前提供无线服务的 eBTS (或者说切换前服务于移动终端的 eBTS, 被称为源 eBTS )转移到另一个提供无线服务的 eBTS (或者说切换后服务于 移动终端的 eBTS, 被称为目的 eBTS ) , 或者移动终端从 eBTS的某个无线 信道转移到相同的 eBTS 的另外一个提供无线服务的无线信道。 此时， 相对 传统的 GSM网络，由于扁平化的网络中并不存在基站控制器， 因此，在 GSM 网络扁平化以后， 部分切换过程将发生改变。
( 1 )如图 2所示的 BSS间切换过程将转变为扁平化网络中的 eBTS间切 换， 如图 6所示， 切换的源 eBTS和目的 eBTS直接连接到核心网。 在网络扁 平化以后， 原先 BSC 的如无线资源管理， 呼叫控制等功能将被分布到各个 eBTS中承担， 相对传统 GSM网络， 扁平化的 GSM网络依然可以沿用原来 的 A口信令流程来完成切换， 信令的内容和数量都可以保持不变。
( 2 )如图 3所示的 BSS内 BTS间切换过程也转变为扁平化网络中的 eBTS 间切换， 如图 7所示， 切换的源 eBTS和目的 eBTS直接连接到核心网。 与传 统 GSM网络不同的是， 在传统 GSM网络中， 切换源 BSC与切换目的 BSC 都是同一个 BSC, 而在网络扁平化后， 源 eBTS与目的 eBTS将不是同一个 eBTS。 因此， 在网络扁平化后， 原先 BSS内切换将转变为类似原先 BSS间 的切换， 相对于传统 GSM网络， 如果扁平化的 GSM网络依然沿用原来 BSS 间切换流程来完成切换的话， A 口交互的信令数量将显著增加， 核心网的信 令处理负荷也会相应增加。
( 3 ) BTS内切换过程未发生本质改变， 仍旧为 eBTS内切换， 如图 8所 示， 源 eBTS与目的 eBTS是同一个 eBTS, 移动终端从该 eBTS的某个无线 信道转移到该 eBTS 的另外一个无线信道， 切换过程只是导致了提供服务的 eBTS的无线信道发生了变化。
由以上内容可见， 在 GSM网络扁平化以后， 由于原先 BSS内 BTS间切 换将转变为 eBTS间的切换， 会显著增加 A口交互信令的数量。 而事实上， 在广泛使用的传统 GSM网络中， 大部分的切换都是 BSS内 BTS间切换， 因 此， 在网络扁平化以后切换应该会导致 A口信令数量大大增加， 从而使核心 网 A口信令负荷增加。
发明内容
本发明所要解决的技术问题， 在于需要提供一种扁平化移动通信网络的 切换系统及方法， 用于扁平化移动通信网络中终端在 eBTS间的切换。
为了解决上述技术问题， 本发明提供了一种扁平化移动通信网络的切换 方法，用于完成所述扁平化移动通信网络中的移动终端在增强型基站 ( eBTS ) 间的切换， 该方法包括：
所述切换时， 所述切换的源 eBTS通过增强型基站间接口与所述切换的 目的 eBTS完成切换通知的信息交互；
所述源 eBTS指示所述移动终端执行所述切换且所述目的 eBTS与核心网 之间完成用于所述切换的 A口连接。
优选地， 所述源 eBTS与所述目的 eBTS完成所述信息交互的步骤包括： 所述源 eBTS向所述目的 eBTS发送切换请求消息，以进行所述信息交互； 所述目的 eBTS 收到所述切换请求消息并确认可以进行所述切换后， 向 所述源 eBTS发送切换请求确认消息， 完成所述信息交互。
优选地，所述切换请求消息携带切换参考号和所述移动终端的能力信息； 所述切换请求确认消息携带所述切换的目的信道信息。
优选地， 所述目的 eBTS与核心网之间完成用于所述切换的 A口连接的 步骤， 包括：
所述源 eBTS指示所述移动终端执行所述切换之后，所述目的 eBTS向所 述核心网发送转换请求消息， 以进行所述切换的 A口连接；
所述核心网向所述目的 eBTS发送转换请求确认消息， 以完成所述 A口 连接。
优选地， 所述目的 eBTS与核心网之间完成用于所述切换的 A口连接的 步骤， 包括：
所述源 eBTS与所述目的 eBTS完成所述切换通知的信息交互之后，所述 目的 eBTS向所述核心网发送信道请求消息， 以进行所述切换的 A口连接； 所述核心网向所述目的 eBTS发送信道请求确认消息， 以完成所述 A口 连接。
优选地， 所述转换请求消息或信道请求消息包括所述目的 eBTS 为所述 切换分配的连接信息； 所述转换请求确认消息或信道请求确认消息包括所述 核心网为所述切换分配的连接信息。
优选地， 所述切换后， 所述目的 eBTS进一步通知所述源 eBTS释放用于 所述移动终端的资源。
为了解决上述技术问题， 本发明还提供了一种扁平化移动通信网络的切 换系统， 用于完成所述扁平化移动通信网络中的移动终端在增强型基站 ( eBTS )间的切换，该系统包括所述切换的源 eBTS、 目的 eBTS以及核心网， 其中：
所述源 eBTS设置成所述切换时通过增强型基站间接口与所述目的 eBTS 完成切换通知的信息交互， 并指示所述移动终端执行所述切换；
所述目的 eBTS设置成与所述源 eBTS完成所述信息交互，与所述核心网 之间完成用于所述切换的 A口连接；
所述核心网设置成与所述目的 eBTS完成所述 A口连接。
优选地，所述源 eBTS设置成向所述目的 eBTS发送切换请求消息以进行 所述信息交互； 所述目的 eBTS设置成收到所述切换请求消息并确认可以进 行所述切换后， 向所述源 eBTS发送切换请求确认消息， 完成所述信息交互。
优选地，所述目的 eBTS设置成所述源 eBTS指示所述移动终端执行所述 切换后， 向所述核心网发送转换请求消息， 以进行所述切换的 A口连接； 所 述核心网设置成向所述目的 eBTS发送转换请求确认消息， 以完成所述切换 的 A口连接。
优选地， 所述目的 eBTS设置成与所述源 eBTS完成所述信息交互之后， 向所述核心网发送信道请求消息， 以进行所述切换的 A口连接； 所述核心网 设置成向所述目的 eBTS发送信道请求确认消息， 以完成所述切换的 A口连 接。
优选地，所述目的 eBTS进一步设置成所述切换后通知所述源 eBTS释放 用于所述移动终端的资源。
与现有技术相比， 本发明系统及方法的技术方案中， 扁平化移动通信网 络中的终端在需要进行 eBTS间的切换时，利用 eBTS间接口进行信息的交互， 使部分信令直接通过 eBTS与 eBTS之间的接口进行交互，从而实现了扁平化 移动通信网络中终端在 eBTS 间的切换， 相比现有技术中普通移动通信网络 内 BSS内 BTS间的切换， 大大减少了核心网与 eBTS之间 A口信令的数量。 附图概述
图 1为现有技术中 GSM网络的架构及接口示意图；
图 2为在传统的 GSM网络中 BSS间的切换示意图；
图 3为在传统的 GSM网络中 BSS内 BTS间切换示意图；
图 4为在传统的 GSM网络中 BTS内切换示意图；
图 5为现有技术中扁平化 GSM网络的架构及接口示意图； 图 6为扁平化 GSM网络中 eBTS间的切换示意图；
图 7为扁平化 GSM网络中 eBTS间的另一切换示意图；
图 8为扁平化 GSM网络中 eBTS内的切换示意图；
图 9为本发明第一实施例的切换信令流程示意图；
图 10为本发明第二实施例的切换信令流程示意图。
本发明的较佳实施方式
以下将结合附图及实施例来详细说明本发明的实施方式， 借此对本发明 如何应用技术手段来解决技术问题， 并达成技术效果的实现过程能充分理解 并据以实施。
本发明提供的切换方法，是扁平化移动通信网络如扁平化 GSM网络中要 发生 eBTS间的切换时， 源 eBTS与目的 eBTS通过 eBTS之间的增强型基站 间接口进行切换通知的信息交互， 交互的信息包括切换需求以及切换条件， 其中的切换需求主要是指源 eBTS告知目的 eBTS有 MS需要切换到该 eBTS, 切换条件主要是指目的 eBTS告知源 eBTS可以进行切换以及用于切换所需要 的无线信道信息。 目的 eBTS在获知有 MS需要切换进来或者确认已经有 MS 切换进来之后， 与核心网通过 A接口进行信息交互， 建立与核心网之间用于 该切换的连接； 这一目的 eBTS与核心网之间的交互过程，可以在 MS切换到 目的 eBTS前进行， 也可以在 MS切换到该目的 eBTS之后进行。 在 MS完成 切换且目的 eBTS与核心网的 A口连接建立完成后，目的 eBTS通过增强型基 站间接口通知源 eBTS释放用于该 MS的资源。
本发明提供的扁平化移动通信网络， 包含源 eBTS、 目的 eBTS和核心网， 其中：
源 eBTS在 MS需要进行 eBTS间的切换时， 向目的 eBTS发起携带有切 换需求的切换请求消息， 并在收到目的 eBTS 回复的切换确认后， 发送切换 命令消息给 MS; 源 eBTS在收到目的 eBTS发送的切换成功或者释放资源的 信息后， 释放原先用于该切换 MS的全部资源。
目的 eBTS在收到源 eBTS的切换请求后， 若 MS可以切换到该 eBTS, 则回复源 eBTS切换确认， 并带有完成切换所需要的目的无线信道信息等切 换条件。 此外， 目的 eBTS需要与核心网通过 A接口信息的交互， 建立目的 eBTS与核心网之间用于该呼叫的 A口连接；这一过程可以在 MS切换到该目 的 eBTS之前进行， 也可以在 MS切换到该目的 eBTS之后进行。 目的 eBTS 在完成 A口的连接建立后， 并在 MS切换完成到目的 eBTS后， 通知源 eBTS 释放全部用于该 MS的资源。
核心网在收到目的 eBTS的需要建立 A口用于切换 MS的信息后， 建立 与目的 eBTS用于该呼叫的 A口连接， 并在 MS切换到目的 eBTS后，释放与 源 eBTS用于该呼叫的 A口连接。
需要说明的是，本发明扁平化 GSM网络是扁平化移动通信网络的典型应 用， 并不构成对本发明扁平化移动通信网络的限制； 本发明扁平化移动通信 网络还可以是其他扁平化的移动通信网络如 LTE扁平化网络等。
本发明系统及方法中， 需要进行 eBTS间的切换时， 利用 eBTS间接口进 行信息的交互，使部分信令直接通过 eBTS与 eBTS之间的接口进行信息的交 互， 不仅实现了扁平化移动通信网络中 eBTS 间的切换， 而且还大大减少 A 口需要的信令数量。
下面将对本发明实施例可实现该切换方式的移动通信网络（例如， 扁平 化的 GSM网络）中的各网元实体进行简要描述。 各网元实体的连接关系（或 者说消息交互关系 )将在后续对本发明方法进行说明时详细描述。
本发明的扁平化的 GSM 网络中包含： MS (进行切换的 MS ) 、 eBTSl
(源 eBTS ) 、 eBTS2 (目的 eBTS )和核心网。
需要说明的是， 如果不冲突， 本发明实施例以及实施例中的各个特征可 以相互结合， 均在本发明的保护范围之内。 另外， 在附图的流程图示出的步 骤可以在诸如一组计算机可执行指令的计算机系统中执行， 并且， 虽然在流 程图中示出了逻辑顺序， 但是在某些情况下， 可以以不同于此处的顺序执行 所示出或描述的步骤。
以下结合附图对本发明的优选实施例进行说明， 应当理解， 此处所描述 的优选实施例仅用于说明和解释本发明， 并不用于限定本发明。 实施例一
根据本发明实施例， 首先提供了切换方法， 由源 eBTS向目的 eBTS发起 切换， 在经过目的 eBTS对切换请求的确认后， 源 eBTS对 MS发送切换命令 消息。 目的 eBTS在 MS切换进来之后， 通知核心网将 A口的连接从源 eBTS 转到目的 eBTS。 目的 eBTS通知源 eBTS释放用于该 MS的资源。
具体地说， 在需要进行 eBTS 与 eBTS 间的切换时（由 eBTSl 切换到 eBTS2 ) , eBTSl向 eBTS2发送切换请求消息， 告知 eBTS2有 MS需要切换 到该 eBTS2。 优选的， 可以在切换请求消息中带有切换参考号以及 MS支持 的编码方式等 MS的能力信息。
eBTS2在收到切换请求消息后， 判断该 MS是否可以进行切换， 判断内 容包括 eBTS2是否存在空闲信道等。若 eBTS2判断该 MS可以切换到 eBTS2, 则回复切换请求确认消息给 eBTSl , 该消息中包含用于 MS切换所需要的目 的无线信道信息， 如信道频点、 时隙和语音编码方式。 优选的， 若 eBTS2判 断该 MS 目前不能切换到 eBTS2, 则回复切换请求拒绝消息给 eBTSl , 该消 息中可以带有拒绝切换的原因， 如当 eBTS2发现目前无可用信道， 则该消息 中包含切换请求拒绝的原因为无可用信道等。
eBTSl在收到 eBTS2回复的切换请求确认消息后， 通过 Um接口给 MS 发送切换命令消息，指示 MS执行切换， 该切换命令消息与传统 GSM网络中 的切换命令消息可以完全相同。 MS在收到 eBTSl的切换命令消息后， 执行 切换动作， 切换到 eBTS2, 并在切换成功后发送切换完成消息给 eBTS2, 该 MS的切换过程可以与传统的 GSM网络中的切换过程完全相同。
eBTS2在收到 MS发送的切换完成消息后， 由于 eBTS2与核心网之间用 于该切换的 A口连接还未建立， 因此分配一个 eBTS2的用于在新用户面连接 上传送语音语音的 A口连接信息，其中含该 eBTS2的 IP地址和 UDP端口号， 并发送转换请求消息给核心网， 该转换请求消息中的内容包括 MS 已经从 eBTSl切换到 eBTS2的指示信息， 以及分配的用于该 MS语音的 eBTS2的 A 口连接信息， 含该 eBTS2的 IP地址和 UDP端口号。 优选的， 转换请求消息 中带有该 MS使用的语音编码方式。
核心网在收到转换请求消息后， 由于 eBTS2与核心网之间用于该呼叫的 A口连接还未建立， 因此分配核心网的用于该呼叫的 A口连接信息， 其中包 括核心网的 IP地址和 UDP端口号。 然后回复 eBTS2转换请求确认消息 , 该 转换请求确认消息中的内容需要包括分配给该呼叫使用的核心网的 A口连接 信息， 其中包括核心网的 IP地址和 UDP端口号。 核心网利用刚才分配的核 心网的 A口连接信息，其中包括核心网的 IP地址和 UDP端口号，以及 eBTS2 在转换请求消息里带的用于该 MS语音的 eBTS2的 A口连接信息，含 eBTS2 的 IP地址和 UDP端口号这两组信息来建立 eBTS2用户面的连接。 在 eBTS2 用户面连接建立后， 则不再使用原先 eBTSl的用户面连接， 改为该 eBTS2的 用户面连接。
eBTS2在收到核心网的转换请求确认消息后， 使用该消息中提供的分配 给该呼叫使用的核心网的 A口连接信息， 其中含核心网的 IP地址和 UDP端 口号作为为新用户面连接信息， 在该新用户面连接上传送语音。 并发送清除 命令消息给 eBTSl , 该清除命令消息用于告知 eBTSl , MS 已经成功切换到 eBTS2, 可以释放 eBTSl中用于该 MS的相关资源， 包括 eBTSl的 Um接口 无线资源和 A接口的地面资源等。
eBTSl在收到 eBTS2发送的清除命令消息后， 释放用于该 MS的相关资 源，包括 eBTSl的 Um接口无线资源和 A接口的地面资源等。优选的， eBTSl 在资源释放后，发送清除完成消息给 eBTS2,该清除完成消息用于告知 eBTS2 在 eBTSl中用于该 MS的资源已经被全部释放了。
下面将结合附图和实施例对本发明的方法以及上述各网元之间的消息交 互关系进行详细描述。
图 9是本发明实施例扁平化后的 GSM网络中的 eBTS与 eBTS间的切换， MS从源 eBTS切换到目的 eBTS的流程图。 如图 9所示， 该流程主要包括如 下步骤：
步骤 S901 ,源 eBTS发送切换请求（Handover Request )消息给目的 eBTS, 携带有 MS的能力信息， 以通知目的 eBTS, 表示有 MS需要切换到该 eBTS 的切换需求；
步骤 S902, 目的 eBTS收到该切换请求消息并根据该能力信息确认可以 进行切换后， 发送切换请求确认 ( Handover Request ACK ) 消息给源 eBTS , 告知源 eBTS可以进行切换， 并携带有切换条件如用于切换的目的信道信息 等；
步骤 S903 ,源 eBTS收到该切换请求确认消息后，发送切换命令 ( Handover Command ) 消息给 MS, 该切换命令消息携带有该目的信道信息； 本过程与 在传统的 GSM网络中的同样过程相同；
步骤 S904, MS收到该切换命令消息后并根据该目的信道信息完成切换 后， 发送切换完成（Handover Complete )消息给目的 eBTS, 本过程与在传统 GSM网络中的同样过程相同；
步骤 S905, 目的 eBTS收到该切换完成消息后， 发送转换请求（ Switch Request )消息给核心网，该转换请求消息用于告知核心网 MS已经从源 eBTS 切换到该 eBTS, 且带有目的 eBTS分配给该切换的 IP地址和 UDP端口号； 步骤 S906 , 核心网收到该转换请求消息后， 根据该 eBTS分配给该切换 的 IP地址和 UDP端口号发送转换请求确认 ( Switch Request ACK )消息给目 的 eBTS, 该转换请求确认消息用于告知目的 eBTS用于该切换的核心网的 IP 地址和 UDP端口号； 根据该核心网的 IP地址和 UDP端口号为该 MS建立切 换后的连接。
步骤 S907, 目的 eBTS收到该转换请求确认消息后，发送清除命令（ Clear Command )消息给源 eBTS, 该清除命令消息用于通知源 eBTS释放原先用于 该 MS的资源；
步骤 S908 , 源 eBTS 收到该清除命令消息后， 发送清除完成 （Clear
Complete )消息给目的 eBTS,该清除完成消息是个优选项，用于告知目的 eBTS 源 eBTS已经完成了资源释放。
实施例二
通过实施例一中的描述， 可以看出， 实施例一中 eBTS2与核心网之间用 于该呼叫的 A口连接建立是在 MS切换完成以后才进行的， 但本发明不限于 此， 对于 eBTS2与核心网之间用于该切换的 A口连接也可以在 MS切换到 eBTS2前就建立。 具体地说， 在需要进行 eBTS 与 eBTS 间的切换时（由 eBTSl 切换到 eBTS2 ) , eBTSl发送给 eBTS2的切换请求消息， 告知 eBTS2有 MS需要切 换到该 eBTS2。 优选的， 可以在切换请求消息中带有切换参考号以及 MS支 持的编码方式等 MS的能力信息。
eBTS2在收到切换请求消息后， 判断该 MS是否可以进行切换， 判断内 容包括 eBTS2是否存在空闲信道等。若 eBTS2判断该 MS可以切换到 eBTS2, 则回复切换请求确认消息给 eBTSl , 该切换请求确认消息中包含用于 MS切 换所需要的目的无线信道信息， 如信道频点、 时隙和语音编码方式。 优选的， 若 eBTS2判断该 MS 目前不能切换到 eBTS2, 则回复切换请求拒绝消息给 eBTSl , 该切换请求拒绝消息中可以带有拒绝切换的原因， 如当 eBTS2发现 目前无可用信道， 则该切换请求拒绝消息中包含切换请求拒绝的原因为无可 用信道等。 同时， eBTS2发送信道请求消息给核心网， 该信道请求消息中包 含分配给该即将切入的呼叫使用的 eBTS2的 A口连接信息， 其中含 eBTS2 的 IP地址和 UDP端口号。
核心网在收到信道请求消息后， 记录 eBTS2分配给该即将切入的呼叫使 用的 eBTS2的 A口连接信息，其中含 eBTS2的 IP地址和 UDP端口号。另外， 核心网分配核心网的用于该呼叫的 A口连接信息 ,其中包括核心网的 IP地址 和 UDP端口号， 并回复信道请求确认消息给 eBTS2 , 该信道请求确认消息中 带有核心网的用于该呼叫的 A口连接信息，其中核心网的包括 IP地址和 UDP 端口号。
eBTSl在收到 eBTS2回复的切换请求确认消息后， 通过 Um接口给 MS 发送切换命令消息，指示 MS执行切换， 该切换命令消息可以与传统 GSM网 络中的切换命令消息完全相同。 MS在收到 eBTSl发送的切换命令消息后， 执行切换动作， 切换到 eBTS2, 并在切换成功后发送切换完成消息给 eBTS2, 该 MS的切换过程可以与传统的 GSM网络中的切换过程完全相同。
eBTS2在收到 MS发送的切换完成消息后，发送转换请求消息给核心网， 该转换请求消息中的内容包括 MS已经从 eBTSl切换到 eBTS2的指示信息。 优选的， 该转换请求消息中带有该 MS使用的语音编码方式。
核心网在收到转换请求消息后， 向 eBTS2回复转换请求确认消息， 并且 不再使用原先 eBTSl的用户面连接， 改为该 eBTS2的用户面连接。
eBTS2在收到核心网发送的的转换请求确认消息后， 使用先前消息中提 供的分配给该呼叫使用的核心网的 A口连接信息，其中含核心网的 IP地址和 UDP端口号， 作为新用户面连接信息， 在该新用户面连接上传送语音。 并发 送清除命令消息给 eBTSl ,该清除命令消息用于告知 eBTSl , MS已经成功切 换到 eBTS2, 可以释放 eBTSl中用于该 MS的相关资源， 包括 eBTSl的 Um 接口无线资源和 A接口的地面资源。
eBTSl在收到 eBTS2发送的清除命令消息后， 释放用于该 MS的相关资 源， 包括 eBTS 1的 Um接口无线资源和 A接口的地面资源。 优选的， eBTS 1 在资源释放后，发送清除完成消息给 eBTS2,该清除完成消息用于告知 eBTS2 在 eBTSl中用于该 MS的资源已经被全部释放了。
下面将结合附图和实施例对本发明的方法以及上述各网元之间的消息交 互关系进行详细描述。
图 10是本发明实施例扁平化后的 GSM网络中的 eBTS与 eBTS间的另一 切换， MS从源 eBTS切换到目的 eBTS的流程图， 如图 10所示， 该流程主要 包括如下步骤：
步骤 SlOa, 源 eBTS发送切换请求消息给目的 eBTS, 携带有 MS的能力 信息， 以通知目的 eBTS, 有 MS需要切换到该 eBTS;
步骤 SlOb, 目的 eBTS收到该切换请求消息并根据该能力信息确认可以 进行切换后 ,发送切换请求确认消息给源 eBTS,告知源 eBTS可以进行切换， 并带有用于切换的目的信道信息；
步骤 SlOc, 目的 eBTS发送信道请求消息给核心网， 该信道请求消息中 带有目的 eBTS分配给切换 MS的 IP地址和 UDP端口号；
步骤 SlOd, 核心网收到该信道请求消息后， 发送信道请求确认消息给目 的 eBTS , 消息中带有核心网分配给切换 MS的 IP地址和 UDP端口号；
步骤 S10e, 源 eBTS收到该切换请求确认消息后， 发送切换命令消息给 MS, 指示 MS执行切换； 该切换命令信息携带该目的信道信息； 本过程与在 传统的 GSM网络中同样过程相同；
步骤 S10f, MS收到该切换命令消息并根据该目的信道信息完成切换后， 发送切换完成消息给目的 eBTS, 本过程与传统 GSM网络中同样过程相同； 步骤 SlOg, 目的 eBTS收到该切换完成消息后， 发送转换请求消息给核 心网， 该转换请求消息用于告知核心网 MS已经从源 eBTS切换到该 eBTS;
步骤 SlOh, 核心网收到该转换请求消息后， 发送转换请求确认消息给目 的 eBTS, 说明核心网已经完成了从源 eBTS到目的 eBTS的转换；
步骤 SlOi, 目的 eBTS收到该转换请求消息后根据该核心网分配的 IP地 址和 UDP端口号建立切换后的连接， 并发送清除命令消息给源 eBTS, 该清 除命令消息用于通知源 eBTS释放原先用于该 MS的资源；
步骤 SlOj , 源 eBTS收到该清除命令消息后， 发送清除完成消息给目的 eBTS; 该消息是个优选项， 用于告知目的 eBTS源 eBTS 已经完成了资源释 放。
显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布 在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执行的程 序代码来实现， 从而， 可以将它们存储在存储装置中由计算装置来执行， 或 者将它们分别制作成各个集成电路模块， 或者将它们中的多个模块或步骤制 作成单个集成电路模块来实现。 这样， 本发明不限制于任何特定的硬件和软 件结合。
虽然本发明所揭露的实施方式如上， 但所述的内容只是为了便于理解本 发明而釆用的实施方式， 并非用以限定本发明。 任何本发明所属技术领域内 的技术人员， 在不脱离本发明所揭露的精神和范围的前提下， 可以在实施的 形式上及细节上作任何的修改与变化， 但本发明的专利保护范围， 仍须以所 附的权利要求书所界定的范围为准。

Claims

权 利 要 求 书
1、一种扁平化移动通信网络的切换方法， 用于完成所述扁平化移动通信 网络中的移动终端在增强型基站（eBTS ) 间的切换， 该方法包括：
所述切换时， 所述切换的源 eBTS通过增强型基站间接口与所述切换的 目的 eBTS完成切换通知的信息交互；
所述源 eBTS指示所述移动终端执行所述切换且所述目的 eBTS与核心网 之间完成用于所述切换的 A口连接。
2、 如权利要求 1所述的方法， 其中， 所述源 eBTS与所述目的 eBTS完 成所述信息交互的步骤包括：
所述源 eBTS向所述目的 eBTS发送切换请求消息，以进行所述信息交互； 所述目的 eBTS 收到所述切换请求消息并确认可以进行所述切换后， 向 所述源 eBTS发送切换请求确认消息， 完成所述信息交互。
3、 如权利要求 2所述的方法， 其中：
所述切换请求消息携带切换参考号和所述移动终端的能力信息； 所述切换请求确认消息携带所述切换的目的信道信息。
4、 如权利要求 1所述的方法， 其中， 所述目的 eBTS与核心网之间完成 用于所述切换的 A口连接的步骤， 包括：
所述源 eBTS指示所述移动终端执行所述切换之后，所述目的 eBTS向所 述核心网发送转换请求消息， 以进行所述切换的 A口连接；
所述核心网向所述目的 eBTS发送转换请求确认消息， 以完成所述 A口 连接。
5、 如权利要求 1所述的方法， 其中， 所述目的 eBTS与核心网之间完成 用于所述切换的 A口连接的步骤， 包括：
所述源 eBTS与所述目的 eBTS完成所述切换通知的信息交互之后，所述 目的 eBTS向所述核心网发送信道请求消息， 以进行所述切换的 A口连接； 所述核心网向所述目的 eBTS发送信道请求确认消息 , 以完成所述 A口 连接。
6、 如权利要求 4或 5所述的方法， 其中：
所述转换请求消息或信道请求消息包括所述目的 eBTS 为所述切换分配 的连接信息；
所述转换请求确认消息或信道请求确认消息包括所述核心网为所述切换 分配的连接信息。
7、 如权利要求 1所述的方法， 其中：
所述切换后，所述目的 eBTS进一步通知所述源 eBTS释放用于所述移动 终端的资源。
8、一种扁平化移动通信网络的切换系统， 用于完成所述扁平化移动通信 网络中的移动终端在增强型基站（eBTS ) 间的切换， 该系统包括所述切换的 源 eBTS、 目的 eBTS以及核心网， 其中：
所述源 eBTS设置成所述切换时通过增强型基站间接口与所述目的 eBTS 完成切换通知的信息交互， 并指示所述移动终端执行所述切换；
所述目的 eBTS设置成与所述源 eBTS完成所述信息交互，与所述核心网 之间完成用于所述切换的 A口连接；
所述核心网设置成与所述目的 eBTS完成所述 A口连接。
9、 如权利要求 8所述的系统， 其中：
所述源 eBTS设置成向所述目的 eBTS发送切换请求消息以进行所述信息 交互；
所述目的 eBTS设置成收到所述切换请求消息并确认可以进行所述切换 后， 向所述源 eBTS发送切换请求确认消息， 完成所述信息交互。
10、 如权利要求 8所述的系统， 其中：
所述目的 eBTS设置成所述源 eBTS指示所述移动终端执行所述切换后， 向所述核心网发送转换请求消息， 以进行所述切换的 A口连接； 所述核心网设置成向所述目的 eBTS发送转换请求确认消息， 以完成所 述切换的 A口连接。
11、 如权利要求 8所述的系统， 其中：
所述目的 eBTS设置成与所述源 eBTS完成所述信息交互之后，向所述核 心网发送信道请求消息， 以进行所述切换的 A口连接；
所述核心网设置成向所述目的 eBTS发送信道请求确认消息， 以完成所 述切换的 A口连接。
12、 如权利要求 8至 11的任一项所述的系统， 其中：
所述目的 eBTS进一步设置成所述切换后通知所述源 eBTS释放用于所述 移动终端的资源。
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CN1853427A (zh) * 2000-08-23 2006-10-25 因特威夫通讯有限公司 分布式蜂窝网络
CN101094523A (zh) * 2006-06-21 2007-12-26 日本电气株式会社 无线电网络系统、无线电基站及所使用的切换控制方法
CN101212790A (zh) * 2006-12-25 2008-07-02 中兴通讯股份有限公司 一种移动通信系统切换时数据包路径转换方法

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Publication number Priority date Publication date Assignee Title
US6947399B1 (en) * 1999-07-19 2005-09-20 Nortel Networks Limited Handoff mechanisms to support real-time delay-critical services in a next generation network
CN1853427A (zh) * 2000-08-23 2006-10-25 因特威夫通讯有限公司 分布式蜂窝网络
CN101094523A (zh) * 2006-06-21 2007-12-26 日本电气株式会社 无线电网络系统、无线电基站及所使用的切换控制方法
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