WO2014198047A1 - 一种网络切换的方法、设备及系统 - Google Patents
一种网络切换的方法、设备及系统 Download PDFInfo
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- WO2014198047A1 WO2014198047A1 PCT/CN2013/077196 CN2013077196W WO2014198047A1 WO 2014198047 A1 WO2014198047 A1 WO 2014198047A1 CN 2013077196 W CN2013077196 W CN 2013077196W WO 2014198047 A1 WO2014198047 A1 WO 2014198047A1
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- network
- base station
- request message
- handover
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- 238000000034 method Methods 0.000 title claims abstract description 86
- 102000018059 CS domains Human genes 0.000 claims abstract description 145
- 108050007176 CS domains Proteins 0.000 claims abstract description 145
- 238000012545 processing Methods 0.000 claims description 50
- 230000004044 response Effects 0.000 claims description 29
- 230000011664 signaling Effects 0.000 claims description 19
- 230000007774 longterm Effects 0.000 claims description 18
- 238000010295 mobile communication Methods 0.000 claims description 12
- 238000012790 confirmation Methods 0.000 claims description 10
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- 230000001960 triggered effect Effects 0.000 abstract description 5
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- 230000008569 process Effects 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 7
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
- H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
Definitions
- the present invention relates to the field of communications technologies, and in particular, to a method, device, and system for network switching.
- Second Generation (2G) or Third Generation (3G) networks such as Global System of Mobile communication (GSM) or Wideband Code Division Multiple Access (WCDMA) Basic coverage has been basically achieved.
- GSM Global System of Mobile communication
- WCDMA Wideband Code Division Multiple Access
- 2G or 3G networks carry session-type services, such as voice calls, through the Circuit Switched (CS) domain.
- the 4G or 3G enhanced network carries session services through a Packet Switch (PS) domain.
- PS Packet Switch
- the UE When the user equipment (UE) of the LTE coverage is processing the voice service, the UE first falls back to the CS domain network and processes the voice service in the CS domain network, thus achieving the circuit switching (French Switched Fallback, CSFB). Reuse existing CS domain devices to provide traditional voice services for users in LTE networks.
- CSFB Circuit Switched Fallback
- the UE when the UE does not support switching from the LTE network to the 2G or 3G network, the UE redirects to
- the present invention provides a network handover method for a user equipment that does not support handover from an LTE network to a 2G or 3G network, where the UE initiates a voice call after the UE is redirected to the 2G or 3G network, and the duration of the entire voice call is long.
- the network triggers the handover from the LTE network to the CS domain of the 2G or 3G network.
- the LTE network mentioned in the present invention includes an LTEA network, and may subsequently have an LTE version.
- a first aspect of the present invention provides a method for network switching, including:
- the mobile management entity MME receives a request message initiated by the user equipment UE located in the long term evolution LTE network, where the request message is used to request the circuit domain to fall back to the CSFB;
- the MME sends a first notification message to the evolved base station eNB, where the first notification message is used to instruct the eNB to move the UE from the LTE network to the 2G or 3G network for the CSFB. ;
- the first handover request message is further used to indicate that the UE does not support handover from the LTE network to the 2G or 3G network.
- the handover request message is used to indicate that the MME switches the UE from the LTE network to the CS domain of the 2G or 3G network for the CSFB;
- the switching request message is used to indicate that the MME is the CSFB to switch the UE from the LTE network to the CS domain of the 2G or 3G network, and is further used to indicate that the UE does not support the The LTE network is switched to the 2G or 3G network.
- the first notification message is further used to indicate that the LTE network and the 2G or 3G network support are
- the CSFB switches the UE from the LTE network to the CS domain of the 2G or 3G network.
- the LTE network and the 2G or 3G network support the UE from the CSFB
- the LTE network switches to the CS domain of the 2G or 3G network, including:
- the LTE network and the 2G or 3G network support the UE from the CSFB
- the LTE network switches to a single wireless voice call continuity SRVCC handover of the 2G or 3G network.
- a second aspect of the present invention provides a method for network switching, including:
- the mobile switching center MSC receives the first handover request message sent by the mobility management entity MME, where the first handover request message is used to request the MSC to switch the user equipment UE from the long term evolution LTE network to the 2G or 3G network for the circuit domain fallback CSFB. Circuit switched CS domain;
- the MSC sends a second handover request message to the base station of the 2G or 3G network, where the second handover request message is used to request the base station to switch the UE from the LTE network to the 2G for the CSFB Or the CS domain of the 3G network, the second handover request message includes an identifier of the UE, so that the base station sends, according to the identifier, the CS domain wireless that is allocated by the base station according to the second handover request message according to the identifier.
- Access bearer RAB
- the MSC receives a handover complete message sent by the base station, where the handover complete message is used to indicate that the UE has moved from the LTE network to the 2G or 3G network.
- the method further includes:
- the UE generates a first session.
- the method further includes:
- the MSC sends a second CS call connection request message to the UE, where the second CS call connection request message is used to request the UE to generate a second session.
- the method further includes:
- the MSC After receiving the at least one of the following messages, the MSC sends a second notification message to the base station, where the second notification message is used to request the base station to allocate CS domain resources to the UE:
- the following message includes: the handover complete message, the connection management service request message sent by the UE, the first CS call connection request message, and the paging response message sent by the UE.
- the method further includes:
- the MSC After the second MSC sends the second CS call connection request message, the MSC sends a second notification message to the base station, where the second notification message is used to request the base station to allocate a CS domain resource to the UE.
- any one of the first to fourth possible implementation manners of the second aspect in a fifth possible implementation manner,
- the second handover request message is further used to indicate that the UE does not support handover from the LTE network to the 2G or 3G network; or
- the first handover request message is further used to indicate that the UE does not support handover from the LTE network to the 2G or 3G network.
- a third aspect of the present invention provides a method for network switching, including:
- the base station of the 2G or 3G network receives the second handover request message sent by the mobile switching center MSC, where the second handover request message includes the first identifier of the user equipment UE, and the second handover request message is used to request the base station to be a circuit
- the domain fallback CSFB switches the UE to a circuit switched CS domain of the 2G or 3G network;
- the base station determines that the first identifier and the second identifier are the same; the base station sends a third notification message to the UE, where the third notification message includes, by the base station, the UE according to the second handover request message.
- the assigned CS domain RAB The assigned CS domain RAB.
- the second handover request message is further used to indicate that the UE does not support switching from the LTE network to the 2G or 3G network.
- the acquiring, by the base station, the second identifier of the UE from the UE includes:
- the base station extracts the second identifier from a wireless connection request message sent by the UE; or The base station extracts the second identifier from a signaling message sent by the UE to the MSC; or
- the base station sends an identifier request message to the UE, where the base station receives an identifier request response message sent by the UE, and the base station extracts an identifier of the UE from the identifier request response message.
- the base station after the base station receives the call setup message or the call acknowledgement message sent by the UE, The base station sends the third notification message to the UE;
- the base station sends the third notification message to the UE.
- the method further includes: receiving, by the base station, the wireless connection After requesting the message,
- the base station Transmitting, by the base station, the UTRAN mobility information of the universal mobile communication system terrestrial radio access network to the UE, where the UTRAN mobility information does not include the location domain identifier LAI, and after the predetermined time, the base station sends the LAI to the UE ;
- the base station sends the UTRAN mobility information to the UE, where the UTRAN mobility information does not include the location domain identifier LAI, and receives a call release command or a call connection connection message sent by the MSC or sent by the UE. After the call connection is connected, the base station transmits an LAI to the UE.
- any one of the first to fourth possible implementation manners of the third aspect in a fifth possible implementation, the method further includes:
- the base station determines not to send the location update request message to the MSC, and sends a location update accept message to the UE.
- a fourth aspect of the present invention provides a network switching method, including:
- the eNodeB eNB located in the LTE-LTE network receives the first notification message sent by the mobility management entity MME, where the first notification message is used to indicate that the eNB moves the user equipment UE from the LTE network to the circuit domain fallback CSFB. 2G or 3G network;
- the eNB sends a handover request message to the MME, where the handover request message is used to initiate a handover of the CS domain from the LTE network to the 2G or 3G network for the CSFB;
- the eNB instructs the UE to redirect from the LTE network to a 2G or 3G network such that the UE moves from the LTE network to the 2G or 3G network.
- the method further includes: before the eNB sends the handover request message to the MME, the eNB determines that the UE does not support from the LTE Switching of the network to the 2G or 3G network;
- the eNB determines that the UE does not support handover from the LTE network to the 2G or 3G network.
- the method further includes: the handover request message includes an indication information, where the indication information is used to request the MME to use the UE as the CSFB Switching from the LTE network to the CS domain of the 2G or 3G network;
- the indication information is used to request the MME to switch the UE from the LTE network to the CS domain of the 2G or 3G network, and indicate that the UE does not support from the LTE network. Switching to the 2G or 3G network;
- the source-to-target container in the handover request message includes another indication information, where the another indication information is used to request the base station of the 2/3G network to use the UE from the LTE network for the CSFB.
- the another indication information is used to request the base station of the 2/3G network to use the UE from the LTE network for the CSFB.
- the source-to-target container in the handover request message includes another indication information, where the another indication information is used to request the base station of the 2/3G network to use the UE from the LTE network for the CSFB.
- the another indication information is used to request the base station of the 2/3G network to use the UE from the LTE network for the CSFB.
- a fifth aspect of the present invention provides a mobility management entity, including:
- a receiving unit configured to receive a request message initiated by a user equipment UE located in a long term evolution LTE network, where the request message is used to request a circuit domain to fall back to the CSFB;
- a generating unit configured to generate, according to the request message received by the receiving unit, a first notification message, where the first notification message is used to indicate that the evolved base station eNB uses the UE to use the UE from the LTE network Move to a 2G or 3G network;
- a sending unit configured to send the first notification message to an evolved base station eNB;
- the receiving unit is further configured to receive a handover request message sent by the eNB;
- the generating unit is further configured to generate a first handover request message according to the handover request message received by the receiving unit, where the first handover request message is used to request the MSC to use the UE from the LTE network Switching to the CS domain of the 2G or 3G network;
- the sending unit is further configured to send the first handover request message to the mobile switching center MSC.
- the first handover request message is further used to indicate that the UE does not support handover from the LTE network to the 2G or 3G network.
- the handover request message is used to indicate that the MME switches the UE from the LTE network to the CS domain of the 2G or 3G network for the CSFB;
- the switching request message is used to indicate that the MME is the CSFB to switch the UE from the LTE network to the CS domain of the 2G or 3G network, and is further used to indicate that the UE does not support the The LTE network is switched to the 2G or 3G network.
- the first notification message is further configured to indicate that the LTE network and the 2G or 3G network support to switch the UE from the LTE network to the CS domain of the 2G or 3G network for the CSFB.
- the LTE network and the 2G or 3G network support to switch the UE from the LTE network to the CSFB A single wireless voice call continuity SRVCC handover for a 2G or 3G network.
- a sixth aspect of the present invention provides a mobile switching center MSC, including:
- a receiving unit configured to receive a first handover request message sent by the mobility management entity MME, where the first handover request message is used to request the MSC to switch the user equipment UE from the long term evolution LTE network to the 2G or 3G for the circuit domain fallback CSFB Circuit switched CS domain of the network;
- a generating unit configured to generate, according to the first switching request message received by the receiving unit And a second handover request message, where the second handover request message is used to request the base station of the 2G or 3G network to switch the UE from the LTE network to the CS domain of the 2G or 3G network for the CSFB,
- the second handover request message includes an identifier of the UE, so that the base station sends, according to the identifier, the CS domain radio access bearer (RAB) allocated by the base station according to the second handover request message to the UE; Transmitting the second handover request message to a base station of the 2G or 3G network;
- RAB radio access bearer
- the receiving unit is further configured to receive a second handover request acknowledgement message sent by the base station of the 2G or 3G network;
- the receiving unit is further configured to receive a handover complete message sent by the base station, where the handover complete message is used to indicate that the UE has moved from the LTE network to the 2G or 3G network.
- the receiving unit is further configured to receive a first CS call connection request message sent by the UE, where the generating unit is further configured to use, according to the first CS call connection request message received by the receiving unit, the CSFB A first session is generated for the UE.
- the sending unit is further configured to send a second CS call connection request message to the UE, where the second CS call connection request message is used to request the UE to generate a second session for the CSFB.
- the receiving unit is further configured to receive a connection management service request message and a paging response message sent by the UE;
- the sending unit is further configured to: after receiving the at least one of the following messages, send a second notification message to the base station, where the second notification message is used to request the base station to allocate a CS domain resource to the UE:
- the following message includes: the handover completion message, the connection management service request message, the first CS call connection request message, and the paging response message.
- the sending unit is further configured to: after the sending unit sends the second CS call connection request message, send the Generating a second notification message generated by the unit to the base station, where the second notification message is used to request the base station to allocate a CS domain resource to the UE.
- the second handover request message is further used to indicate that the UE does not support handover from the LTE network to the 2G or 3G network; or
- the first handover request message is further used to indicate that the UE does not support handover from the LTE network to the 2G or 3G network.
- a seventh aspect of the present invention provides a base station for a 2G or 3G network, including:
- a receiving unit configured to receive a second handover request message sent by the mobile switching center MSC, where the second handover request message includes a first identifier of the user equipment UE, where the second handover request message is used to request the base station to The UE switches to a circuit switched CS domain of the 2G or 3G network;
- the receiving unit is further configured to receive a wireless connection request message that is sent after the UE moves to the 2G or 3G network;
- a processing unit configured to establish a wireless connection with the UE according to the wireless connection request message received by the receiving unit
- the processing unit is further configured to acquire the second identifier of the UE from the UE, and determine that the first identifier and the second identifier are the same;
- the processing unit is further configured to allocate a CS domain radio access bearer RAB to the UE according to the second handover request message received by the receiving unit;
- the processing unit is further configured to generate a third notification message, where the third notification message includes the CS domain RAB;
- a sending unit configured to send a third notification message to the UE.
- the processing unit is further configured to determine that the UE does not support switching from an LTE network to a 2G or 3G network.
- the receiving unit is further configured to receive a signaling message that is sent by the UE to the MSC, where the processing unit is configured to extract the second identifier from the wireless connection request message or the signaling message; or,
- the sending unit is further configured to send an identifier request message to the UE;
- the receiving unit is further configured to receive an identifier request response message sent by the UE, where the processing unit is configured to extract the second identifier from the identifier request response message.
- the first or the second possible implementation manner of the seventh aspect in a third possible implementation manner,
- the receiving unit is further configured to receive a call setup message or a call confirmation message sent by the UE, or receive a call processing message sent by the MSC;
- the sending unit sends the third notification after the receiving unit receives the call setup message or the call confirmation message sent by the UE, or after the receiving unit receives the call processing message sent by the MSC. A message to the UE.
- any one of the first to third possible implementation manners of the seventh aspect in a fourth possible implementation manner,
- the sending unit is further configured to send, to the UE, a universal mobile communication system terrestrial radio access network UTRAN mobility information, where the UTRAN mobility information does not include a location domain identifier LAI, and after a predetermined time, to the UE Send LAI.
- any one of the first to third possible implementation manners of the seventh aspect in a fifth possible implementation manner,
- the sending unit is further configured to send, by the UE, a universal mobile communication system terrestrial radio access network UTRAN mobility information, where the UTRAN mobility information does not include a location domain identifier LAI;
- the receiving unit is further configured to receive a call release command or a call connection open message sent by the MSC or a call connection connect message sent by the UE;
- the sending unit is further configured to send the LAI to the UE after the receiving unit receives the call release command or the call connection connection message.
- any one of the first to fifth possible implementation manners of the seventh aspect in a sixth possible implementation manner,
- the receiving unit is further configured to receive a call release message sent by the MSC,
- the processing unit is further configured to redirect the UE to the LTE according to the call release message The network, or switching the UE to the LTE network according to the call release message.
- the receiving unit is further configured to receive a location update request message sent by the UE,
- the processing unit is further configured to determine that the location update request message is not sent to the MSC, where the sending unit is further configured to send, to the UE, when determining that the location update request message is not sent to the MSC The location update request message.
- An eighth aspect of the present invention provides an evolved base station eNB, including:
- a receiving unit configured to receive a first notification message sent by the mobility management entity MME, where the first notification message is used to indicate that the eNB moves the user equipment UE from the LTE network to the 2G or 3G network for the circuit domain fallback CSFB ;
- a generating unit configured to generate a handover request message according to the first notification message received by the receiving unit, where the handover request message is used to initiate a CS domain from the LTE network to the 2G or 3G network for the CSFB Switching
- a sending unit configured to send the handover request message to the MME
- the sending unit is further configured to send a redirect request message to the UE, where the redirect request message indicates that the UE is redirected from the LTE network to the 2G or 3G network.
- the eNodeB further includes: a determining unit, configured to determine, before the sending unit sends the handover request message to the MME, that the UE does not support Switching from the LTE network to the 2G or 3G network; and/or for determining, before the sending unit sends the redirection request message, that the UE does not support from the LTE network to the 2G Or switching of 3G networks.
- a determining unit configured to determine, before the sending unit sends the handover request message to the MME, that the UE does not support Switching from the LTE network to the 2G or 3G network.
- a ninth aspect of the present invention provides a network switching system, including: a mobility management entity, an evolved base station, a mobile switching center, a base station, and a user equipment;
- the mobility management entity is the mobility management entity described in the foregoing technical solution
- the mobile switching center is the mobile switching center described in the above technical solution.
- the base station is the base station described in the foregoing technical solution
- the evolved base station is the evolved base station described in the foregoing technical solution.
- the method provided by the embodiment of the present invention for a UE that does not support handover from an LTE network to a 2G or 3G network, when the UE is redirected from the LTE network to the 2G or 3G network, the network triggers the LTE from the LTE.
- the network switches to the CS domain of the 2G or 3G network, so that the network can prepare the voice resources of the CS domain in advance and shorten the voice call duration.
- FIG. 1 is a schematic diagram of an embodiment of a method for network switching in an embodiment of the present invention
- FIG. 2 is a schematic diagram of another embodiment of a method for network switching in an embodiment of the present invention.
- FIG. 3 is a schematic diagram of another embodiment of a method for network switching in an embodiment of the present invention.
- FIG. 4 is a schematic diagram of another embodiment of a method for network switching in an embodiment of the present invention.
- FIG. 5 is a schematic diagram of another embodiment of a method for network switching in an embodiment of the present invention.
- FIG. 6 is a schematic diagram of another embodiment of a method for network switching in an embodiment of the present invention.
- FIG. 7 is a schematic diagram of a mobility management entity in an embodiment of the present invention.
- FIG. 8 is a schematic diagram of a mobile switching center in an embodiment of the present invention.
- FIG. 9 is a schematic diagram of a base station in an embodiment of the present invention.
- FIG. 10 is a schematic diagram of an evolved base station according to an embodiment of the present invention.
- FIG. 11 is a schematic diagram of a network switching system in an embodiment of the present invention.
- the embodiment of the present invention provides a network handover method. For a UE that does not support handover from an LTE network to a 2G or 3G network, the network triggers a handover from the LTE network to the CS domain of the 2G or 3G network, and the UE moves to 2G/3G through redirection.
- the network in advance, prepares the voice resources of the CS domain of the 2G or 3G network for the UE, shortens the duration of the entire voice call, and improves the user experience.
- the embodiments of the present invention also provide corresponding devices and systems. The details are described below separately.
- the Chinese and English versions and abbreviations of the partial communication nouns in the embodiments of the present invention include: Mobile Management Entity (MME), Envolved NodeB (eNB), User Equipment (UE), and Mobile Switching Center. (Mobile Services Switching Centre, MSC), second-generation or third-generation mobile communication technology (2rd Generation/3rd Generation, 2G or 3G), base station, (Base Station, BS), base station in the embodiment of the present invention includes base station control Base Station Controller (BSC) and Radio Network Controller (RNC); Long Term Evolution (LTE), Serving GPRS Support Node (SGSN), circuit domain fallback ( Circuit Switched Fallback, CSFB), Terrestrial Radio Access Network (UTRAN), Global System of Mobile communication (GSM), Enhanced Data Rate for GSM Evolution (EDGE) Global Mobile Communications System / Enhanced Data Speed Rate GSM Evolution Technology Radio Access Network (GSM/EDGE Radio Access Network, GERAN).
- MME Mobile Management Entity
- eNB Envolved NodeB
- UE User
- the first, second, third, fourth, etc. in the embodiment of the present invention are only used to distinguish different indication information, and do not represent a sequential relationship.
- FIG. 1 is a schematic diagram of a network switching process and an active calling process after network switching according to an embodiment of the present invention:
- the UE sends a request message to the MME, where the request message is used to request that the circuit domain fall back.
- the MME may determine whether the LTE network and the 2/3G network support switching the UE from the LTE network to the CS domain of the 2G or 3G network for the CSFB.
- the MME may also not judge, but by default, consider that the LTE network and the 2G or 3G network support the CSFB to switch the UE from the LTE network to the CS domain of the 2G or 3G network, or only to the CS domain. Some networks make judgments.
- the MME sends a first notification message to the evolved base station eNB according to the request message, where the first notification message is used to instruct the evolved base station eNB to use the UE from the LTE for the CSFB.
- the network moves to a 2G or 3G network, that is, a first notification message is used to indicate that the eNB is the CSFB and the UE should be moved to a 2G or 3G network.
- the MME may switch to 2G or by sending a first notification message to the network.
- the circuit switched CS domain of the 3G network such that the eNB initiates a handover request for the CSFB to switch the UE from the LTE network to a circuit switched CS domain of a 2G or 3G network.
- the first notification message may include third indication information, and the third indication information is used to indicate whether the LTE network and the 2G or 3G network support the UE from the LTE network for the CSFB. Switch to the CS domain of the 2G or 3G network.
- the third indication information includes a first cell and a second cell, where the first cell is used to indicate a CSFB, and the second cell is used to indicate the LTE network and the 2G or 3G network. Whether to support the handover of the UE from the LTE network to the CS domain of the 2G or 3G network.
- the third indication information may be indication information indicating that the LTE network and the 2G or 3G network support a single wireless voice call continuity SRVCC handover.
- the third indication information in the embodiment of the present invention may be referred to as an optimized CSFB indicator, and is based on a single radio voice call continuity (SRVCC) CSFB indicator (SRVCC).
- SRVCC single radio voice call continuity
- CSFB indicator or enhanced CSFB possible or SRVCC Operation possible may be referred to as an optimized CSFB indicator, and is based on a single radio voice call continuity (SRVCC) CSFB indicator (SRVCC).
- the eNB sends a handover request message to the MME, where the handover request message is used to request the MME to switch the UE from the LTE network to the CS domain of the 2G or 3G network for the CSFB;
- the message may be a PS domain handover request message of the LTE network to the 2G or 3G network, or a CS domain handover request message of the LTE network to the 2G or 3G network, or the LTE network to the 2G or PS domain and CS domain handover request messages for 3G networks.
- the handover request message may include UE capability information, used to indicate frequency band information, access capability, and the like supported by the UE.
- the UE capability information may be at least one of class identifier 2 (classmark 2) and class identifier 3 (classmark 3).
- classmark 2 class identifier 2
- classmark 3 class identifier 3
- the MME does not have the capability information of the UE, but the MME needs to send the UE capability information to the MSC, so that the MSC can perform the handover to the 2G/3G CS.
- the MME obtains the capability information of the UE, it may send to the MSC.
- the UE capability information may be delivered to the MME by using a handover request message.
- the handover request message may include second indication information, the second indication information indicating that the MME switches the user equipment UE from the LTE network to the circuit switching CS domain of the 2G or 3G network for the CSFB.
- the second indication information may further indicate that the UE does not support handover from the LTE network to the 2G or 3G network.
- the base station may consider that the UE does not support by default.
- the source-to-target container in the handover request message may include fifth indication information, where the fifth indication information is used to request the base station of the 2/3G network to switch the UE from the LTE network to the CSFB.
- the CS domain of a 2G or 3G network may further indicate that the UE does not support handover from the LTE network to the 2G or 3G network. For example, the UE does not support handover from the LTE network to the 2G or 3G network, i.e., the UE does not support switching from the LTE network to the PS domain and the CS domain of the 2G or 3G network.
- the second indication information does not indicate that the UE does not support switching from the LTE network to the 2G or
- the MME may consider that the UE does not support by default.
- the fifth indication information does not indicate that the UE does not support handover from the LTE network to the 2G or 3G network
- the base station may consider that the UE does not support by default.
- the second indication information and the fifth indication information may be referred to as a CSFB indication, an optimized CSFB indication, an SRVCC based CSFB indication, an enhanced CSFB indication, or an enhanced CSFB likelihood indication.
- the second indication information may include a CSFB indication field, or a CSFB indication field and a UE capability field.
- the CSFB indication field indicates that the MME switches the UE from the LTE network to the circuit switched CS domain of the 2G or 3G network for the CSFB.
- the UE Capability field indicates that the UE does not support handover from the LTE network to the 2G or 3G network.
- the fifth indication information may include a CSFB indication field, or a CSFB indication field and a UE capability field.
- the CSFB indication field indicates that the base station of the 2G or 3G network switches the UE from the LTE network to the circuit switched CS domain of the 2G or 3G network for the CSFB.
- the UE Capability field indicates that the UE does not support handover from the LTE network to the 2G or 3G network.
- the eNB includes the fifth indication information in the source RNC to target RNC transparent container. You can use the existing source RNC to the CSFB information field in the target RNC transparent container as the CSFB indicator field. A field can be added to the source RNC to the target RNC transparent container as the UE capability field.
- the eNB includes the fifth indication information in the old BSS to new BSS information.
- the CSFB indicator field or the UE capability field may be added to the old BSS to the new BSS information.
- the MME sends a first handover request message to the MSC, where the first handover request message is used for the CS domain.
- the handover required by the first handover request message is a handover from the LTE network to the CS domain of the 2G or 3G network, that is, the first handover request is a PS to CS handover request.
- the MSC After receiving the first handover request message, the MSC can prepare a CS voice resource, and send a second handover request message to indicate that the base station of the 2G or 3G network prepares the CS voice resource.
- the first handover request message may include first indication information, where the first indication information is used to request the MSC to switch the UE from the long term evolution LTE network to the circuit switched CS domain of the 2G or 3G network for the CSFB. That is, the first indication information indicates that the first handover request is sent for CSFB. The first indication information may also indicate that the UE does not support handover from the LTE network to the 2G or 3G network. The first handover request message may also not indicate CSFB, and the MSC defaults that the first handover request is sent for CSFB.
- the first handover request message may include UE capability information, so that the MSC can perform handover to 2G/3G CS.
- the capability information is at least one of a class identifier classmark2 and a class identifier classmark3.
- the MME may include the default codec information in the first handover request message according to the target system of the handover.
- the first indication information in the first handover request message may be referred to as a CSFB indication, an optimized CSFB indicator, and a single radio voice call continuity (SRVCC) CSFB indication (SRVCC based CSFB Indicator). ), enhanced CSFB indicator or enhanced CSFB possible o
- the STN-SR is used for voice switching between the IP Multimedia Subsystem and the 2/3G circuit domain, and the embodiment of the present invention involves the circuit retreating, so when the first handover request message includes the session transfer number - Session Transfer Number-Single Radio (STN-SR), the MSC ignores the STN-SR number.
- STN-SR Session Transfer Number-Single Radio
- the MSC sends a second handover request message to the base station, where the second handover request message includes a first identifier of the user equipment UE, where the second handover request message is used to request the base station to drop the CSFB for the circuit domain to the UE.
- the UE first label is only a temporary "Temporary Mobile Subscriber Identity (TMSI) and/or International Mobile Subscriber Identification Number (IMSI).
- TMSI Temporal Mobile Subscriber Identity
- IMSI International Mobile Subscriber Identification Number
- the second handover request message may include fourth indication information, where the fourth indication information is used to request the base station to switch the UE from the LTE network to the CS domain of the 2G or 3G network for the circuit domain fallback CSFB.
- the fourth indication information may also indicate that the UE does not support handover from the LTE network to the 2G or 3G network.
- the second handover request acknowledgement message includes a radio access bearer RAB, and the RAB is used by the UE to switch from the LTE network to the PS domain of the 2G or 3G network for the CSFB.
- RAB radio access bearer
- the RAB is an RAB whose domain is identified as a packet switched domain, or the RAB is a PS RAB.
- the RAB whose domain ID is a packet switched domain may be a CS RAB, but the domain identifier in the CS RAB is a packet switched domain.
- the UE can also initiate a CS supplementary service request on the 2/3G network, For example, the positioning service request, or USSD (Unstructured Supplemental Service Data, unstructured supplementary data service service request. That is, the UE may fall back from the LTE network execution circuit because the UE wants to initiate a CS call or initiate a CS supplementary service request on the 2/3G network.
- the base station may generate a CS RAB.
- the CS call may be used for the CS call initiated after the UE falls back to the CS domain.
- the second handover request acknowledgement message may not include the CS RAB. .
- the base station may determine, according to the capability of the UE included in the fourth indication information, that the UE does not support handover from the LTE to the 2G or 3G network.
- the base station may also consider by default that the UE does not support handover to a 2G or 3G network, and thus does not have to judge.
- the MSC sends a first handover request response message to the MME.
- the MME sends a handover request response to the eNB, and the eNB ignores the handover request response.
- the eNB sends an RRC redirection message to the UE.
- the RRC redirect message is an RRC Release with Redirction or an RRC Release message.
- the eNB may also send other messages to move the UE to a 2G or 3G network, such as a Network Assisted Cell Change (CPC) message, a CCO message (Cell Change Order).
- CPC Network Assisted Cell Change
- CCO Cell Change Order
- the eNB After receiving the first notification message in S105, the eNB sends an RRC redirection message in S135 to the UE.
- the eNB After transmitting the handover request message in SI 10, the eNB sends an RRC redirection message in S 135 to the UE.
- the eNB After receiving the handover request response message in S130, the eNB sends an RRC redirection message in S135 to the UE.
- the UE accesses the 2G or 3G network from the LTE network for the CSFB according to an RRC redirection message. That is, the UE moves from the LTE network to the 2G or 3G network.
- the UE sends an air interface establishment process to the base station (BSC or RNC).
- BSC base station
- RNC Radio Network Controller
- the wireless connection request message establishes an RRC Connection Setup message for the channel request Channel Request message or the radio resource control connection.
- the base station (BSC or RNC) sends a completion message (HO Complete) to the MSC.
- HO Complete completion message
- the base station of the 2G or 3G network After receiving the signaling message sent by the UE to the MSC, the base station of the 2G or 3G network establishes a handover process in the circuit switched CS domain of the LTE network to the 2G or 3G network. The connection sends the signaling message to the MSC.
- the base station sends the signaling message to the MSC by using a direct transfer message.
- the UE sends a connection management service request (CM Service Request) to the MSC.
- CM Service Request connection management service request
- the MSC sends an authentication request (Authenticate Request) to the UE.
- Authenticate Request an authentication request
- the UE sends an Authenticate Response to the MSC.
- the MSC sends a security mode command to the base station, and carries the Integrity Protection Information and/or the Encryption Information, so that the base station sends the security mode command to the UE.
- This step S170 may also not be performed, that is, the MSC does not send a security mode command to the base station.
- the base station sends a security mode command to the UE. Specifically, the base station performs this step according to the security mode command in step S170, or the base station performs this step after receiving the S145 message.
- the MSC sends a connection management service command to the UE.
- the UE sends a first CS call connection setup request message to the MSC, where the first CS call connection setup request message is used to request the MSC to generate a first session for the CSFB.
- the MSC sends a call proceeding message to the UE.
- the MSC performs peer processing of the call.
- the base station sends a third notification message to the UE, where the third notification message includes a CS domain RAB allocated by the base station to the UE according to the second handover request message.
- the UE may send a third notification response message to the base station.
- the base station After the base station receives the call processing message sent by the MSC or the call setup message sent by the UE, the base station sends a third notification message to the UE, where the third notification message includes the base station as the The CS domain RAB allocated by the UE.
- the third notification message may be a radio bearer setup or a radio bearer reconfiguration message.
- the UE can use the CS RAB for voice calls.
- the base station may also send the third notification message after receiving the second notification message sent by the MSC.
- the MSC After receiving the at least one of the following messages, the MSC sends a second notification message to the base station, where the second notification message is used to request the base station to allocate a CS domain resource to the UE;
- the following message includes: a handover complete message sent by the base station, a connection management service request message sent by the UE, and the first CS call connection request message sent by the UE.
- the MSC sends an alerting message to the UE.
- the UE waits for the peer to reply to the message.
- the called party picks up the phone and enters the call state.
- the UE When the call ends, since the call is triggered by CSFB, the UE needs to return to the LTE network after completing the call.
- the base station determines, according to the second handover request message, that the call is triggered by the CSFB, and therefore, the base station of the 2/3G network receives the call release message sent by the MSC; and the 2/3G network
- the base station redirects the UE to the LTE network, or the base station switches the UE to the LTE network, and the call release message is a release command Iu Release Command or a clear command Clear Command.
- the base station may parse the CS signaling between the UE and the MSC.
- the base station receives the signaling message sent by the UE to the MSC, for example, a connection management service request, an authentication response, a first CS call connection setup request message, and the like.
- the base station may send the signaling message to the MSC using a connection established during handover of the LTE network to the CS domain of the 2G or 3G network, or send the signaling message to the MSC using a direct transmission message.
- the first indication information, the second indication information, the fourth indication information, and the fifth indication information may include a CSFB indication field, or a CSFB indication field and a UE capability field.
- the CSFB indicator field indicates that the MME is the CSFB to switch the UE from the LTE network to the circuit switched CS domain of the 2G or 3G network.
- the UE Capability field indicates that the UE does not support handover from the LTE network to the 2G or 3G network.
- the UE for UEs that do not support handover from an LTE network to a 2G or 3G network, the UE is from LTE.
- the network When the network is redirected to the 2G or 3G network, the network triggers the CS domain that is switched from the LTE network to the 2G or 3G network, so that the network can prepare the voice resources of the CS domain in advance and shorten the voice call duration.
- FIG. 2 is a schematic diagram of a passive handover process after a network handover process and a network handover according to an embodiment of the present invention:
- the MSC sends a CS paging request to the MME, and the MME triggers the paging process.
- Steps S200-S280 are the same as steps S100-S180 in FIG. 1, and will not be described in detail herein.
- the MSC sends a second CS call connection setup request message to the UE, where the second CS call connection setup request message is used to request the UE to generate a second session for the CSFB.
- the MSC can also initiate a CS supplementary service request to the UE on the 2/3G network, such as: 3 ⁇ 4 port location service request, or USSD (UnstructuredSupplementaryServiceData, unstructured supplementary data service service request. That is, The UE may fall back from the LTE network execution circuit because the MSC is to initiate a CS call or initiate a CS supplementary service request on the 2/3G network.
- a CS supplementary service request such as: 3 ⁇ 4 port location service request, or USSD (UnstructuredSupplementaryServiceData, unstructured supplementary data service service request.
- the MSC receives a call confirmation message sent by the UE.
- the MSC performs peer processing of the call.
- the base station sends a third notification message to the UE.
- the UE may send a third notification response message to the base station.
- the base station In order to maximize the matching with the existing processing procedure of the UE, reduce the abnormality, and avoid the call failure, after the base station receives the call setup message sent by the MSC or the call acknowledgement message sent by the UE, the base station sends the UE to the UE. And sending a third notification message, where the third notification message includes a CS domain RAB allocated by the base station to the UE.
- the third notification message may be a wireless bearer setup or a radio bearer reconfiguration message.
- the UE can use the CS RAB for voice calls.
- the base station may also send the third notification message after receiving the second notification message sent by the MSC.
- the MSC After receiving the at least one of the following messages, the MSC sends a second notification message to the base station, where the second notification message is used to request the base station to allocate a CS domain resource to the UE;
- the following message includes: a handover complete message sent by the base station, a paging response sent by the UE, and the second CS call connection request message sent by the MSC.
- the MSC sends an alerting message to the UE.
- the UE picks up the phone and enters the call state.
- the UE needs to return to the LTE network after completing the call.
- the base station determines, according to the second handover request message, that the call is triggered by the CSFB, and therefore, the base station of the 2/3G network receives the call release message sent by the MSC; and the 2/3G network
- the base station redirects the UE to the LTE network, or the base station switches the UE to the LTE network, and the call release message is a release command Iu Release Command or a clear command Clear Command.
- the base station may parse the CS signaling between the UE and the MSC.
- the base station receives signaling messages sent by the UE to the MSC, such as a call confirmation message, an authentication response, a second CS call connection setup request message, and the like.
- the base station may transmit the signaling message to the MSC using a connection established during handover of the LTE network to the CS domain of the 2G or 3G network, or send the signaling message to the MSC using a direct transmission message.
- the first indication information, the second indication information, the fourth indication information, and the fifth indication information may include a CSFB indication field, or a CSFB indication field and a UE capability field.
- the CSFB indicator field indicates that the MME is the CSFB to switch the UE from the LTE network to the circuit switched CS domain of the 2G or 3G network.
- the UE Capability field indicates that the UE does not support handover from the LTE network to the 2G or 3G network.
- the network when the UE is redirected from the LTE network to the 2G or 3G network, the network triggers a CS domain that is switched from the LTE network to the 2G or 3G network. Therefore, the network can prepare the voice resources of the CS domain in advance, and shorten the voice call duration.
- the above two application scenarios describe the entire network switching and session process from two aspects: the UE calling party and the UE calling.
- an embodiment of a method for network switching provided by an embodiment of the present invention includes:
- the mobility management entity receives the request message initiated by the user equipment UE located in the long term evolution LTE network, where the request message is used to request the circuit domain to fall back to the CSFB.
- the MME sends a first notification message to the evolved base station eNB according to the request message, where the first notification message is used to indicate that the eNB moves the UE from the LTE network to 2G or the CSFB. 3G network.
- the MME receives a handover request message sent by the eNB.
- the MME sends a first handover request message to the mobile switching center MSC, where the first handover request message is used to request the MSC to switch the UE from the LTE network to the circuit switching of the 2G or 3G network.
- CS domain The description in the corresponding embodiments will not be repeated here.
- the method provided by the embodiment of the present invention for a UE that does not support handover from an LTE network to a 2G or 3G network, when the UE is redirected from the LTE network to the 2G or 3G network, the network triggers the LTE from the LTE.
- the network switches to the CS domain of the 2G or 3G network, so that the network can prepare the voice resources of the CS domain in advance and shorten the voice call duration.
- another embodiment of a method for network switching provided by an embodiment of the present invention includes:
- the mobile switching center MSC receives the first handover request message sent by the mobility management entity MME, where the first handover request message is used to request the MSC to switch the user equipment UE from the long term evolution LTE network to the 2G or the circuit domain fallback CSFB or Circuit switched CS domain of 3G networks.
- the MSC sends a second handover request message to the base station of the 2G or 3G network, where the second handover request message is used to request the base station to switch the UE from the LTE network to the CSFB.
- the second handover request message includes an identifier of the UE, so that the base station sends, according to the identifier, the CS allocated by the base station according to the second handover request message according to the identifier.
- the domain radio access carries the RAB.
- the MSC receives a second handover request acknowledgement message sent by a base station of the 2G or 3G network.
- the MSC receives a handover complete message sent by the base station, where the handover complete message is used to indicate that the UE has moved from the LTE network to the 2G or 3G network.
- the MSC After receiving the at least one of the following messages, or after sending the second CS call connection request message, the MSC sends a second notification message to the base station, where the second notification message is used to request the base station to be the UE.
- the method provided by the embodiment of the present invention for a UE that does not support handover from an LTE network to a 2G or 3G network, when the UE is redirected from the LTE network to the 2G or 3G network, the network triggers the LTE from the LTE.
- the network switches to the CS domain of the 2G or 3G network, so that the network can prepare the voice resources of the CS domain in advance and shorten the voice call duration.
- another embodiment of a method for network switching provided by an embodiment of the present invention includes:
- the base station of the 301, 2G or 3G network receives the second handover request message sent by the mobile switching center MSC, where the second handover request message includes the first identifier of the user equipment UE, and the second handover request message is used to request the base station
- the UE is switched to the circuit switched CS domain of the 2G or 3G network for the circuit domain fallback CSFB.
- the base station receives a wireless connection request message sent by the UE after moving to the 2G or 3G network, and establishes a wireless connection with the UE.
- the base station acquires a second identifier of the UE from the UE.
- the base station determines that the first identifier and the second identifier are the same; the base station sends a third notification message to the UE, where the third notification message includes the base station according to the second handover request message.
- the method provided by the embodiment of the present invention for a UE that does not support handover from an LTE network to a 2G or 3G network, when the UE is redirected from the LTE network to the 2G or 3G network, the network triggers the LTE from the LTE.
- the network switches to the CS domain of the 2G or 3G network, so that the network can prepare the voice resources of the CS domain in advance and shorten the voice call duration.
- another embodiment of the method for network handover provided by the embodiment of the present invention includes: 401.
- the evolved base station eNB located in the LTE-LTE network receives the first notification message sent by the mobility management entity MME, where the first notification is sent.
- the message is used to instruct the eNB to move the user equipment UE from the LTE network to the 2G or 3G network for the circuit domain fallback CSFB.
- the eNB sends a handover request message to the MME, where the handover request message is used to initiate a handover of the CS domain from the LTE network to the 2G or 3G network for the CSFB. 403.
- the eNB instructs the UE to redirect from the LTE network to a 2G or 3G network, so that the UE moves from the LTE network to the 2G or 3G network.
- the method provided by the embodiment of the present invention for a UE that does not support handover from an LTE network to a 2G or 3G network, when the UE is redirected from the LTE network to the 2G or 3G network, the network triggers the LTE from the LTE.
- the network switches to the CS domain of the 2G or 3G network, so that the network can prepare the voice resources of the CS domain in advance and shorten the voice call duration.
- an embodiment of a mobility management entity provided by an embodiment of the present invention includes: a receiving unit 501, a generating unit 502, and a sending unit 503.
- the receiving unit 501 is configured to receive a request message initiated by the user equipment UE located in the Long Term Evolution (LTE) network, where the request message is used to request the circuit domain to fall back to the CSFB.
- LTE Long Term Evolution
- a generating unit 502 configured to generate, according to the request message received by the receiving unit, a first notification message, where the first notification message is used to instruct the evolved base station eNB to use the UE from the LTE for the CSFB
- the network moves to a 2G or 3G network.
- the sending unit 503 is configured to send the first notification message to the evolved base station eNB.
- the receiving unit 501 is further configured to receive a handover request message sent by the eNB.
- the generating unit 502 is further configured to generate, according to the handover request message received by the receiving unit, a first handover request message, where the first handover request message is used to request the MSC to use the UE from the LTE
- the network switches to the CS domain of the 2G or 3G network.
- the sending unit 503 is further configured to send the first handover request message to the mobile switching center MSC.
- the method in the embodiment of FIG. 1, FIG. 2, and FIG. 3 may be performed.
- the mobility management entity provided by the embodiment of the present invention triggers when the UE redirects from the LTE network to the 2G or 3G network for the UE that does not support handover from the LTE network to the 2G or 3G network.
- the voice resource of the domain shortens the duration of voice calls.
- an embodiment of a mobile switching center MSC includes: a receiving unit 601, a generating unit 602, and a sending unit 603.
- the receiving unit 601 is configured to receive a first handover request message sent by the mobility management entity MME, where the first handover request message is used to request the MSC to switch the user equipment UE from the long term evolution LTE network to the 2G or the circuit domain fallback CSFB or Circuit switched CS domain of 3G networks.
- the generating unit 602 is configured to generate, according to the first handover request message received by the receiving unit, a second handover request message, where the second handover request message is used to request the base station of the 2G or 3G network to be the CSFB Switching the UE from the LTE network to the CS domain of the 2G or 3G network, where the second handover request message includes an identifier of the UE, so that the base station sends the identifier to the UE according to the identifier.
- the CS domain radio access bearer RAB allocated by the base station according to the second handover request message.
- the sending unit 603 is configured to send the second handover request message to a base station of the 2G or 3G network.
- the receiving unit 601 is further configured to receive a second handover request acknowledgement message sent by the base station of the 2G or 3G network.
- the receiving unit 601 is further configured to receive a handover complete message sent by the base station, where the handover complete message is used to indicate that the UE has moved from the LTE network to the 2G or 3G network.
- the receiving unit 601 is further configured to receive a first CS call connection request message sent by the UE.
- the generating unit 602 is further configured to generate, for the CSFB, a first session for the UE according to the first CS call connection request message received by the receiving unit.
- the sending unit 603 is further configured to send a second CS call connection request message to the UE, where the second CS call connection request message is used to request the UE to generate a second session for the CSFB.
- the receiving unit 601 is further configured to receive a connection management service request message and a paging response message sent by the UE.
- the sending unit 603 is further configured to: after receiving the at least one of the following messages, send a second notification message to the base station, where the second notification message is used to request the base station to allocate a CS domain resource to the UE, where The following message includes: the handover complete message, the connection management service request message, the first CS call connection request message, and the paging response message.
- the sending unit 603 is further configured to send, after the sending unit sends the second CS call connection request message, a second notification message generated by the generating unit to the base station, where the second notification message is used.
- the base station is requested to allocate a CS domain resource to the UE.
- the MSC described in the method embodiments of FIG. 1, FIG. 2, FIG. 4 can be executed.
- the mobile switching center provided by the embodiment of the present invention triggers the network when the UE is redirected from the LTE network to the 2G or 3G network for the UE that does not support the handover from the LTE network to the 2G or 3G network.
- the network can prepare the voice resources of the CS domain in advance and shorten the voice call duration.
- an embodiment of a base station of a 2G or 3G network includes: a receiving unit 701, a processing unit 702, and a sending unit 703.
- the receiving unit 701 is configured to receive a second handover request message sent by the mobile switching center MSC, where the second handover request message includes a first identifier of the user equipment UE, where the second handover request message is used to request the base station to The UE switches to the circuit switched CS domain of the 2G or 3G network.
- the receiving unit 701 is further configured to receive a wireless connection request message that is sent after the UE moves to the 2G or 3G network.
- the processing unit 702 is configured to establish a wireless connection with the UE according to the wireless connection request message received by the receiving unit 701.
- the processing unit 702 is further configured to acquire the second identifier of the UE from the UE, and determine that the first identifier and the second identifier are the same.
- the processing unit 702 is further configured to allocate a CS domain radio access bearer RAB to the UE according to the second handover request message received by the receiving unit 701.
- the processing unit 702 is further configured to generate a third notification message, where the third notification message includes the CS domain RAB.
- the sending unit 703 is configured to send a third notification message to the UE.
- the processing unit 702 is further configured to determine that the UE does not support handover from an LTE network to a 2G or 3G network.
- the receiving unit 701 is further configured to receive a signaling message that is sent by the UE to the MSC, where the processing unit is configured to extract the second identifier from the wireless connection request message or the signaling message. .
- the sending unit 703 is further configured to send an identifier request message to the UE;
- the method is further configured to receive an identifier request response message sent by the UE, where the processing unit 702 is configured to extract the second identifier from the identifier request response message.
- the receiving unit 701 is further configured to receive a call setup message or a call confirmation message sent by the UE, or receive a call processing message sent by the MSC, where the sending unit 703 is received by the receiving unit 701. After the call setup message or the call acknowledgement message sent by the UE, or after the receiving unit receives the call processing message sent by the MSC, the third notification message is sent to the UE.
- the sending unit 703 is further configured to send, to the UE, a UTRAN mobility information of a universal mobile communication system terrestrial radio access network, where the UTRAN mobility information does not include a location domain identifier LAI, after a predetermined time, to the The UE sends the LAI.
- the sending unit 703 is further configured to send, to the UE, a UTRAN mobility information of a universal mobile communication system terrestrial radio access network, where the UTRAN mobility information does not include a location domain identifier LAI; and the receiving unit 701 is further configured to: Receiving a call release command or a call connection connection message sent by the MSC or a call connection connection message sent by the UE; the sending unit 703 is further configured to receive the call release command or the location at the receiving unit 701.
- the LAI is sent to the UE after the call connection close message.
- the receiving unit 701 is further configured to receive a call release message sent by the MSC, where the processing unit 703 is further configured to redirect the UE to the LTE network according to the call release message, or according to the A call release message switches the UE to the LTE network.
- the receiving unit 701 is further configured to receive a location update request message sent by the UE, where the processing unit 702 is further configured to determine that the location update request message is not sent to the MSC, where the sending unit 703 further And configured to send the location update request message to the UE when determining that the location update request message is not sent to the MSC.
- the actions performed by each unit in the base station station described in the method embodiments of FIG. 1, FIG. 2, and FIG. 5 and the relationship between the units can be performed.
- the base station provided by the embodiment of the present invention triggers the LTE from the LTE when the UE is redirected from the LTE network to the 2G or 3G network for the UE that does not support the handover from the LTE network to the 2G or 3G network.
- the network switches to the CS domain of the 2G or 3G network, so that the network can prepare the voice resources of the CS domain in advance and shorten the voice call duration.
- an embodiment of an evolved base station 80 includes: a receiving unit 801, a generating unit 802, a sending unit 803, and a determining unit 804.
- the receiving unit 801 is configured to receive a first notification message sent by the mobility management entity MME, where the first notification message is used to indicate that the eNB moves the user equipment UE from the LTE network to the 2G or 3G for the circuit domain fallback CSFB.
- the internet The internet.
- the generating unit 802 is configured to generate, according to the first notification message received by the receiving unit 801, a handover request message, where the handover request message is used to initiate the CSFB from the LTE network to the 2G or 3G network. Switching of the CS domain.
- the sending unit 803 is configured to send the handover request message to the MME.
- the sending unit 803 is further configured to send a redirect request message to the UE, where the redirect request message indicates that the UE is redirected from the LTE network to the 2G or 3G network.
- a determining unit 804 configured to determine, before the sending unit 803 sends the handover request message to the MME, that the UE does not support handover from the LTE network to the 2G or 3G network; and/or Before the sending unit sends the redirection request message, it is determined that the UE does not support handover from the LTE network to the 2G or 3G network.
- the method described in the method embodiments of FIG. 1, FIG. 2, and FIG. 6 may be performed.
- the evolved base station provided by the embodiment of the present invention triggers the network when the UE redirects from the LTE network to the 2G or 3G network for the UE that does not support handover from the LTE network to the 2G or 3G network.
- the LTE network switches to the CS domain of the 2G or 3G network, so that the network can prepare the CS domain in advance. Voice resources, reducing the length of voice calls.
- the transmitting unit for transmitting the message may be implemented by using a transmitter, and the receiving unit for receiving the message may be implemented by using a receiver.
- both the transmitting unit and the receiving unit can be implemented by using a transceiver.
- the transmitter or the transceiver may be implemented by one physical entity, or may be implemented by multiple physical entities.
- the transmitter and the transceiver may be implemented by one physical entity or multiple physical entities. This is not a limitation.
- the other units, such as the generating unit, the processing unit, the determining unit, and the like, may be implemented by one or more processors.
- the present invention is not limited thereto, and the program in the embodiment of the present invention executed by the processor may be stored in the memory.
- a network switching system includes: a mobility management entity 50, an evolved base station 80, a mobile switching center 60, a base station 70, and a user equipment 90.
- the division of the unit is only a logical function division, and the actual implementation may have another
- the manner of division, such as multiple units or components, may be combined or integrated into another system, or some features may be omitted or not performed.
- the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
- the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
- each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
- the integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
- a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
- the foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .
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Abstract
本发明公开了一种网络切换的方法,位于LTE网络的UE发起的请求电路域回落CSFB的请求消息后,MME指示eNB将所述UE从LTE网络移动到2G或3G 网络,并请求MSC将所述UE从所述LTE网络切换到2G或3G网络的CS域;从而使对于不支持从LTE网络切换到2G或3G网络的UE,在UE从LTE网络重定向到2G或3G网络时,网络触发了从LTE网络切换到2G或3G网络的CS域,从而网络能够提前准备CS域的语音资源,缩短语音呼叫时长。
Description
一种网络切换的方法、 设备及系统 技术领域
本发明涉及通信技术领域, 具体涉及一种网络切换的方法、 设备及系统。
背景技术
全球移动通讯系统( Global System of Mobile communication, GSM )或者 宽带码分多址(Wideband Code Division Multiple Access, WCDMA )等第二代 ( Second Generation, 2G )或者第三代网络( Third Generation, 3G ) 网络已经 基本实现了全面覆盖。
随着第四代( Fourth Generation, 4G ) 网络中的系统架构演进( System
Architect Evolution, SAE )、 长期演进( Long Term Evolution, LTE )等网络技 术的发展以及增强型的高速链路分组接入技术 (High Speed Uplink Packet Access , HSPA )、 高速下行链路分组接入技术(High Speed Downlink Packet Access , HSPA+ ) 以及全球敫波互联接入 ( Worldwide Interoperability for Microwave Access, WiMax)网络技术的发展, 这些 4G网络或者 3G增强型网 络已覆盖到一些城区和话务热点地区, 这样在目前的通信网络中, 这些 4G网 络、 3G增强型网络与 2G或 3G网络并存。
2G或 3G网络都是通过电路交换 (Circuit Switched, CS)域承载会话类业务, 如语音电话。 而 4G或者 3G增强型网络通过分组交换( Packet Switch, PS ) 域承载会话业务。
电路域回落(Circuit Switched Fallback, CSFB)为 LTE覆盖下的用户设备 ( User Equipment, UE )在处理语音业务时, UE先回退到 CS域网络, 在 CS域 网络处理语音业务,这样就达到了重用现有的 CS域设备来为 LTE网络中的用户 提供传统的语音业务的目的。
现有技术中, 当 UE不支持从 LTE网络切换到 2G或 3G网络时, UE重定向到
2G或 3G网络后发起语音呼叫, 整个语音呼叫时长较长, 导致用户体验差。
发明内容
针对现有技术中存在的, 当 UE不支持从 LTE网络切换到 2G或 3G网络时,
UE重定向到 2G或 3G网络后发起语音呼叫, 整个语音呼叫时长较长的问题, 本 发明实施例提供一种网络切换方法, 对于不支持从 LTE网络切换到 2G或 3G网 络的用户设备, 在 UE从 LTE网络重定向到 2G或 3G网络时, 网络触发从 LTE网 络切换到 2G或 3G网络的 CS域。 本发明中所提到的 LTE网络, 包括 LTEA网络、 以及后续可能出现 LTE版本。
本发明第一方面提供一种网络切换的方法, 包括:
移动管理实体 MME接收到位于长期演进 LTE网络的用户设备 UE发起的请 求消息, 所述请求消息用于请求电路域回落 CSFB;
根据所述请求消息, 所述 MME向演进基站 eNB发送第一通知消息, 所述 第一通知消息用于指示所述 eNB为所述 CSFB将所述 UE从所述 LTE网络移动到 2G或 3G网络;
所述 MME接收所述 eNB发送的切换要求消息;
所述 MME向移动交换中心 MSC发送第一切换请求消息, 所述第一切换请 求消息用于请求所述 MSC将所述 UE从所述 LTE网络切换到所述 2G或 3G网络 的电路交换 CS域。
结合第一方面, 在第一种可能的实现方式中,
所述第一切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络。
结合第一方面或第一方面第一种可能的实现方式,在第二种可能的实现方 式中,
所述切换要求消息用于指示所述 MME为所述 CSFB将所述 UE从所述 LTE网 络切换到所述 2G或 3G网络的 CS域;
或者, 所述切换要求消息用于指示所述 MME为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域, 并且还用于指示所述 UE不支持从所 述 LTE网络切换到所述 2G或 3G网络。
结合第一方面、第一方面第一种或第二种可能的实现方式,在第三种可能 的实现方式中,
所述第一通知消息还用于指示所述 LTE网络和所述 2G或 3G网络支持为所
述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域。 结合第一方面第三种可能的实现方式, 在第四种可能的实现方式中, 所述 LTE网络和所述 2G或 3G网络支持为所述 CSFB将所述 UE从所述
LTE网络切换到所述 2G或 3G网络的 CS域, 包括:
所述 LTE网络和所述 2G或 3G网络支持为所述 CSFB将所述 UE从所述
LTE网络切换到所述 2G或 3G网络的单一无线语音呼叫连续性 SRVCC切换。
本发明第二方面提供一种网络切换的方法, 包括:
移动交换中心 MSC接收移动管理实体 MME发送的第一切换请求消息, 所 述第一切换请求消息用于请求所述 MSC为电路域回落 CSFB将用户设备 UE从 长期演进 LTE网络切换到 2G或 3G网络的电路交换 CS域;
所述 MSC向所述 2G或 3G网络的基站发送第二切换请求消息, 所述第二切 换请求消息用于请求所述基站为所述 CSFB将所述 UE从所述 LTE网络切换到所 述 2G或 3G网络的 CS域, 所述第二切换请求消息包含所述 UE的标识, 以便所述 基站根据所述标识向所述 UE发送所述基站根据所述第二切换请求消息分配的 CS域无线接入承载 RAB;
所述 MSC接收所述基站发送的第二切换请求确认消息;
所述 MSC接收所述基站发送的切换完成消息,所述切换完成消息用于指示 所述 UE已经从所述 LTE网络移动到所述 2G或 3G网络。
结合第二方面, 在第一种可能的实现方式中, 所述方法还包括:
所述 MSC接收所述 UE发送的第一 CS呼叫连接请求消息, 所述 MSC为所述
UE生成第一会话。
结合第二方面, 在第二种可能的实现方式中, 所述方法还包括:
所述 MSC向所述 UE发送第二 CS呼叫连接请求消息, 所述第二 CS呼叫连接 请求消息用于请求所述 UE生成第二会话。
结合第二方面第一种可能的实现方式, 在第三种可能的实现方式中, 所述 方法还包括:
所述 MSC收到至少一条下列消息之后,发送第二通知消息给所述基站,所 述第二通知消息用于请求所述基站为所述 UE分配 CS域资源:
其中, 所述下列消息包括: 所述切换完成消息, 所述 UE发送的连接管理 业务请求消息,所述第一 CS呼叫连接请求消息, 所述 UE发送的寻呼响应消息。
结合第二方面第二种可能的实现方式, 在第四种可能的实现方式中, 所述 方法还包括:
所述 MSC发送所述第二 CS呼叫连接请求消息之后, 发送第二通知消息给 所述基站, 所述第二通知消息用于请求所述基站为所述 UE分配 CS域资源。
结合第二方面、 第二方面第一种至第四种可能的实现方式中的任意一种, 在第五种可能的实现方式中,
所述第二切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络; 或者,
所述第一切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络。
本发明第三方面提供一种网络切换的方法, 包括:
2G或 3G网络的基站接收移动交换中心 MSC发送的第二切换请求消息, 所 述第二切换请求消息包含用户设备 UE的第一标识, 所述第二切换请求消息用 于请求所述基站为电路域回落 CSFB将所述 UE切换到所述 2G或 3G网络的电路 交换 CS域;
所述基站接收所述 UE移动到所述 2G或 3G网络后发送的无线连接请求消 息, 建立与所述 UE之间的无线连接;
所述基站从所述 UE获取所述 UE的第二标识;
所述基站确定所述第一标识和第二标识相同; 所述基站向所述 UE发送第 三通知消息,所述第三通知消息包含所述基站根据所述第二切换请求消息为所 述 UE分配的 CS域 RAB。
结合第三方面,在第一种可能的实现方式中, 所述第二切换请求消息还用 于指示所述 UE不支持从所述 LTE网络切换到所述 2G或 3G网络。
结合第三方面或第三方面第一种可能的实现方式,在第二种可能的实现方 式中, 所述基站从所述 UE获取所述 UE的第二标识, 包括:
所述基站从所述 UE发送的无线连接请求消息中提取所述第二标识; 或者,
所述基站从所述 UE发送给所述 MSC的信令消息中提取所述第二标识; 或 者,
所述基站发送标识请求消息给所述 UE, 所述基站接收所述 UE发送的标识 请求响应消息, 所述基站从所述标识请求响应消息中提取所述 UE的标识。
结合第三方面、第三方面第一种或第二种可能的实现方式,在第三种可能 的实现方式中, 在所述基站接收所述 UE发送的呼叫建立消息或者呼叫确认消 息后, 所述基站发送所述第三通知消息给所述 UE;
或者在所述基站接收所述 MSC发送的呼叫处理消息后,所述基站发送所述 第三通知消息给所述 UE。
结合第三方面、 第三方面第一种至第三种可能的实现方式中的任意一种, 在第四种可能的实现方式中, 所述方法还包括,在所述基站接收所述无线连接 请求消息之后,
所述基站向所述 UE发送通用移动通信系统陆地无线接入网 UTRAN移动 性信息, 所述 UTRAN移动性信息不包含位置域标识 LAI, 在预定的时间后, 所 述基站向所述 UE发送 LAI;
或者, 所述基站向所述 UE发送 UTRAN移动性信息, 所述 UTRAN移动性 信息不包含位置域标识 LAI , 在接收所述 MSC发送的呼叫释放命令或者呼叫连 接接通消息或者所述 UE发送的呼叫连接接通消息之后, 所述基站向所述 UE发 送 LAI。
结合第三方面、 第三方面第一种至第四种可能的实现方式中的任意一种, 在第五种可能的实现方式中, 所述方法还包括:
所述基站接收所述 UE发送的位置更新请求消息,
所述基站确定不向所述 MSC发送所述位置更新请求消息,并发送位置更新 接受消息给所述 UE。
本发明第四方面提供一种网络切换的方法, 包括:
位于长期演进 LTE网络的演进基站 eNB接收移动管理实体 MME发送来的 第一通知消息, 所述第一通知消息用于指示所述 eNB为电路域回落 CSFB将用 户设备 UE从所述 LTE网络移动到 2G或 3G网络;
所述 eNB向所述 MME发送切换要求消息, 所述切换要求消息用于为所述 CSFB发起从所述 LTE网络到所述 2G或 3G网络的 CS域的切换;
所述 eNB指示所述 UE从所述 LTE网络重定向到 2G或 3G网络, 以便所述 UE 从所述 LTE网络移动到所述 2G或 3G网络。
结合第四方面, 在第一种可能的实现方式中, 所述方法还包括: 在所述 eNB向所述 MME发送所述切换要求消息之前, 所述 eNB确定所述 UE不支持从所述 LTE网络到所述 2G或 3G网络的切换;
和 /或,在所述 eNB指示所述 UE从 LTE网络重定向到 2G或 3G网络,所述 eNB 确定所述 UE不支持从所述 LTE网络到所述 2G或 3G网络的切换。
结合第四方面, 在第二种可能的实现方式中, 所述方法还包括: 所述切换要求消息包含一指示信息, 所述一指示信息用于请求所述 MME 为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域;
或者, 所述一指示信息用于请求所述 MME为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域, 并且指示所述 UE不支持从所述 LTE 网络切换到所述 2G或 3G网络;
或者, 所述切换要求消息中的源到目标容器中包含另一指示信息, 所述另 一指示信息用于请求所述 2/3G网络的基站为所述 CSFB将所述 UE从所述 LTE网 络切换到所述 2G或 3G网络的 CS域;
或者, 所述切换要求消息中的源到目标容器中包含另一指示信息, 所述另 一指示信息用于请求所述 2/3G网络的基站为所述 CSFB将所述 UE从所述 LTE网 络切换到所述 2G或 3G网络的 CS域, 并且指示所述 UE不支持从所述 LTE网络切 换到所述 2G或 3G网络。
本发明第五方面提供一种移动管理实体, 包括:
接收单元, 用于接收位于长期演进 LTE网络的用户设备 UE发起的请求消 息, 所述请求消息用于请求电路域回落 CSFB;
生成单元, 用于根据所述接收单元接收的所述请求消息, 生成第一通知消 息, 所述第一通知消息用于指示所述演进基站 eNB为所述 CSFB将所述 UE从所 述 LTE网络移动到 2G或 3G网络;
发送单元, 用于向演进基站 eNB发送所述第一通知消息;
所述接收单元, 还用于接收所述 eNB发送的切换要求消息;
所述生成单元,还用于根据所述接收单元接收的所述切换要求消息, 生成 第一切换请求消息, 所述第一切换请求消息用于请求所述 MSC将所述 UE从所 述 LTE网络切换到所述 2G或 3G网络的 CS域;
所述发送单元, 还用于向移动交换中心 MSC发送所述第一切换请求消息。 结合第五方面, 在第一种可能的实现方式中,
所述第一切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络。
结合第五方面或第五方面第一种可能的实现方式,在第二种可能的实现方 式中,
所述切换要求消息用于指示所述 MME为所述 CSFB将所述 UE从所述 LTE网 络切换到所述 2G或 3G网络的 CS域;
或者, 所述切换要求消息用于指示所述 MME为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域, 并且还用于指示所述 UE不支持从所 述 LTE网络切换到所述 2G或 3G网络。
结合第五方面、第五方面第一种或第二种可能的实现方式,在第三种可能 的实现方式中,
所述第一通知消息还用于指示所述 LTE网络和所述 2G或 3G网络支持为所 述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域。
结合第五方面第三种可能的实现方式, 在第四种可能的实现方式中, 所述 LTE网络和所述 2G或 3G网络支持为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的单一无线语音呼叫连续性 SRVCC切换。
本发明第六方面提供一种移动交换中心 MSC, 包括:
接收单元, 用于接收移动管理实体 MME发送的第一切换请求消息, 所述 第一切换请求消息用于请求所述 MSC为电路域回落 CSFB将用户设备 UE从长 期演进 LTE网络切换到 2G或 3G网络的电路交换 CS域;
生成单元, 用于根据所述接收单元接收的所述第一切换请求消息, 生成第
二切换请求消息, 所述第二切换请求消息用于请求所述 2G或 3G网络的基站为 所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域, 所述第 二切换请求消息包含所述 UE的标识, 以便所述基站根据所述标识向所述 UE发 送所述基站根据所述第二切换请求消息分配的 CS域无线接入承载 RAB; 发送 单元, 用于向所述 2G或 3G网络的基站发送所述第二切换请求消息;
所述接收单元, 还用于接收所述 2G或 3G网络的基站发送的第二切换请求 确认消息;
所述接收单元,还用于接收所述基站发送的切换完成消息, 所述切换完成 消息用于指示所述 UE已经从所述 LTE网络移动到所述 2G或 3G网络。
结合第六方面, 在第一种可能的实现方式中,
所述接收单元, 还用于接收所述 UE发送的第一 CS呼叫连接请求消息; 所述生成单元, 还用于根据所述接收单元接收的所述第一 CS呼叫连接请 求消息为所述 CSFB为所述 UE生成第一会话。
结合第六方面, 在第二种可能的实现方式中,
所述发送单元, 还用于向所述 UE发送第二 CS呼叫连接请求消息, 所述第 二 CS呼叫连接请求消息用于请求所述 UE为所述 CSFB生成第二会话。
结合第六方面第一种可能的实现方式, 在第三种可能的实现方式中, 所述接收单元, 还用于接收所述 UE发送的连接管理业务请求消息和寻呼 响应消息;
所述发送单元,还用于在收到至少一条下列消息之后,发送第二通知消息 给所述基站, 所述第二通知消息用于请求所述基站为所述 UE分配 CS域资源: 其中, 所述下列消息包括: 所述切换完成消息, 所述连接管理业务请求消 息, 所述第一 CS呼叫连接请求消息, 所述寻呼响应消息。
结合第六方面第二种可能的实现方式, 在第四种可能的实现方式中, 所述发送单元, 还用于在所述发送单元发送所述第二 CS呼叫连接请求消 息之后,发送所述生成单元生成的第二通知消息给所述基站, 所述第二通知消 息用于请求所述基站为所述 UE分配 CS域资源。
结合第六方面、 第六方面第一种至第四种可能的实现方式中的任意一种,
在第五种可能的实现方式中,
所述第二切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络; 或者,
所述第一切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络。
本发明第七方面提供一种 2G或 3G网络的基站, 包括:
接收单元,用于接收移动交换中心 MSC发送的第二切换请求消息,所述第 二切换请求消息包含用户设备 UE的第一标识, 所述第二切换请求消息用于请 求所述基站将所述 UE切换到所述 2G或 3G网络的电路交换 CS域;
所述接收单元, 还用于接收所述 UE移动到所述 2G或 3G网络后发送的无线 连接请求消息;
处理单元,用于根据所述接收单元接收的所述无线连接请求消息建立与所 述 UE之间的无线连接;
所述处理单元, 还用于从所述 UE获取所述 UE的第二标识, 确定所述第一 标识和第二标识相同;
所述处理单元,还用于根据所述接收单元接收的所述第二切换请求消息为 所述 UE分配 CS域无线接入承载 RAB;
所述处理单元, 还用于生成第三通知消息, 所述第三通知消息包含所述 CS域 RAB;
发送单元, 用于向所述 UE发送第三通知消息。
结合第七方面, 在第一种可能的实现方式中,
所述处理单元, 还用于确定所述 UE不支持从 LTE网络到 2G或 3G网络的切 换。
结合第七方面或第七方面第一种可能的实现方式,在第二种可能的实现方 式中,
所述接收单元, 还用于接收所述 UE发送给所述 MSC的信令消息, 其中, 所述处理单元用于从所述无线连接请求消息或所述信令消息提取所述第二标 识;
或者,
所述发送单元, 还用于发送标识请求消息给所述 UE;
所述接收单元, 还用于接收所述 UE发送的标识请求响应消息, 其中, 所 述处理单元用于从所述标识请求响应消息提取所述第二标识。
结合第七方面、第七方面第一种或第二种可能的实现方式,在第三种可能 的实现方式中,
所述接收单元, 还用于接收所述 UE发送的呼叫建立消息或者呼叫确认消 息, 或者, 接收所述 MSC发送的呼叫处理消息;
其中, 所述发送单元是在所述接收单元接收所述 UE发送的呼叫建立消息 或者呼叫确认消息后,或者在所述接收单元接收所述 MSC发送的呼叫处理消息 后, 发送所述第三通知消息给所述 UE的。
结合第七方面、 第七方面第一种至第三种可能的实现方式中的任意一种, 在第四种可能的实现方式中,
所述发送单元, 还用于向所述 UE发送通用移动通信系统陆地无线接入网 UTRAN移动性信息, 所述 UTRAN移动性信息不包含位置域标识 LAI, 在预定 的时间后, 向所述 UE发送 LAI。
结合第七方面、 第七方面第一种至第三种可能的实现方式中的任意一种, 在第五种可能的实现方式中,
所述发送单元, 还用于向所述 UE发送通用移动通信系统陆地无线接入网 UTRAN移动性信息, 所述 UTRAN移动性信息不包含位置域标识 LAI;
所述接收单元,还用于接收所述 MSC发送的呼叫释放命令或者呼叫连接接 通消息或者所述 UE发送的呼叫连接接通消息;
所述发送单元,还用于在所述接收单元接收所述呼叫释放命令或者所述呼 叫连接接通消息之后向所述 UE发送 LAI。
结合第七方面、 第七方面第一种至第五种可能的实现方式中的任意一种, 在第六种可能的实现方式中,
所述接收单元, 还用于接收所述 MSC发送的呼叫释放消息,
所述处理单元,还用于根据所述呼叫释放消息将所述 UE重定向到所述 LTE
网络, 或者根据所述呼叫释放消息将所述 UE切换到所述 LTE网络。 结合第七方面、 第七方面第一种至第六种可能的实现方式中的任意一种, 在第七种可能的实现方式中,
所述接收单元, 还用于接收所述 UE发送的位置更新请求消息,
所述处理单元, 还用于确定不向所述 MSC发送所述位置更新请求消息, 所述发送单元,还用于在确定不向所述 MSC发送所述位置更新请求消息时 向所述 UE发送所述位置更新请求消息。
本发明第八方面提供一种演进基站 eNB, 包括:
接收单元, 用于接收移动管理实体 MME发送来的第一通知消息, 所述第 一通知消息用于指示所述 eNB为电路域回落 CSFB将用户设备 UE从所述 LTE网 络移动到 2G或 3G网络;
生成单元,用于根据所述接收单元接收的所述第一通知消息生成切换要求 消息, 所述切换要求消息用于为所述 CSFB发起从所述 LTE网络到所述 2G或 3G网络的 CS域的切换;
发送单元, 用于向所述 MME发送所述切换要求消息;
所述发送单元, 还用于向所述 UE发送重定向请求消息, 所述重定向请求 消息指示所述 UE从所述 LTE网络重定向到所述 2G或 3G网络。
结合第八方面, 在第一种可能的实现方式中, 所述演进基站还包括: 确定单元,用于在所述发送单元向所述 MME发送所述切换要求消息之前, 确定所述 UE不支持从所述 LTE网络到所述 2G或 3G网络的切换; 和 /或, 用于在 所述发送单元发送所述重定向请求消息之前, 确定所述 UE不支持从所述 LTE 网络到所述 2G或 3G网络的切换。
本发明第九方面提供一种网络切换系统, 包括:移动管理实体、演进基站、 移动交换中心、 基站和用户设备;
所述移动管理实体为上述技术方案所述的移动管理实体;
所述移动交换中心为上述技术方案所述的移动交换中心;
所述基站为上述技术方案所述的基站;
所述演进基站为上述技术方案所述的演进基站。
与现有技术中相比, 本发明实施例提供的方法, 对于不支持从 LTE网络切 换到 2G或 3G网络的 UE, 在 UE从 LTE网络重定向到 2G或 3G网络时, 网络触发 了从 LTE网络切换到 2G或 3G网络的 CS域, 从而网络能够提前准备 CS域的语音 资源, 缩短语音呼叫时长。
附图说明
为了更清楚地说明本发明实施例中的技术方案,下面将对实施例描述中所 需要使用的附图作筒单地介绍,显而易见地, 下面描述中的附图仅仅是本发明 的一些实施例, 对于本领域技术人员来讲, 在不付出创造性劳动的前提下, 还 可以根据这些附图获得其他的附图。
图 1是本发明实施例中网络切换的方法的一实施例示意图;
图 2是本发明实施例中网络切换的方法的另一实施例示意图;
图 3是本发明实施例中网络切换的方法的另一实施例示意图;
图 4是本发明实施例中网络切换的方法的另一实施例示意图;
图 5是本发明实施例中网络切换的方法的另一实施例示意图;
图 6是本发明实施例中网络切换的方法的另一实施例示意图;
图 7是本发明实施例中移动管理实体的示意图;
图 8是本发明实施例中移动交换中心的示意图;
图 9是本发明实施例中基站的示意图;
图 10是本发明实施例中演进基站的示意图;
图 11是本发明实施例中网络切换系统的示意图。
具体实施方式
本发明实施例提供一种网络切换方法,对于不支持从 LTE网络切换到 2G或 3G网络的 UE, 网络触发从 LTE网络切换到 2G或 3G网络的 CS域, UE通过重定 向移动到 2G/3G网络, 从而提前为 UE准备 2G或 3G网络的 CS域的语音资源, 缩 短了整个语音呼叫时长, 改善了用户体验。本发明实施例还提供了相应的设备 及系统。 以下分别进行详细说明。
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清 楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是
全部的实施例。基于本发明中的实施例, 本领域技术人员在没有作出创造性劳 动前提下所获得的所有其他实施例, 都属于本发明保护的范围。
本发明实施例涉及到的部分通信名词的中英文对照及缩写包括:移动管理 实体( Mobile Managenment Entity, MME )、演进基站 ( Envolved NodeB , eNB )、 用户设备( User Equipment, UE )、 移动交换中心 ( Mobile Services Switching Centre , MSC )、 第二代或者第三代移动通信技术 ( 2rd Generation/3rd Generation , 2G或 3G )、 基站、 ( Base Station , BS )、 本发明实施例中的基站 包括基站控制器(Base Station Controller, BSC ) 和无线网络控制器(Radio Network Controller, RNC); 长期演进(Long Term Evolution, LTE)、月良务 GPRS 支撑节点( Serving GPRS Support Node, SGSN ), 电路域回落( Circuit Switched Fallback, CSFB),陆地无线接入网( Terrestrial Radio Access Network, UTRAN)、 全球移动通讯系统( Global System of Mobile communication, GSM ), 增强型 数据速率 GSM演进技术(EnhancedDataRateforGSMEvolution, EDGE )全球移 动通讯系统 /增强型数据速率 GSM演进技术无线接入网络( GSM / EDGE Radio Access Network, GERAN )。
本发明实施例中的第一、第二、第三、第四等仅用于区分不同的指示信息, 不代表顺序关系。
参阅图 1 ,图 1为本发明实施例中网络切换过程及网络切换后的主动呼叫过 程:
S100、 UE向 MME发送请求消息, 所述请求消息用于请求电路域回落
CSFB。
S100a、 MME可以判断所述 LTE网络和所述 2/3G网络是否支持为所述 CSFB 将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域。
MME也可以不进行判断, 而是缺省认为 LTE网络和 2G或 3G网络支持为所 述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域, 或者只对 其中的某些网络进行判断。
S105、 MME根据所述请求消息, 向演进基站 eNB发送第一通知消息, 所 述第一通知消息用于指示所述演进基站 eNB为所述 CSFB将所述 UE从所述 LTE
网络移动到 2G或 3G网络, 也就是, 第一通知消息用于指示所述 eNB为所述 CSFB所述 UE应当被移动到 2G或 3G网络。
当 MME判断 LTE网络和 2G或 3G网络支持为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域后, MME可以通过发送第一通知消息 网络切换到 2G或 3G网络的电路交换 CS域, 以使 eNB发起为所述 CSFB将所述 UE从所述 LTE网络切换到 2G或 3G网络的电路交换 CS域的切换要求。
例如, 可以在所述第一通知消息包含第三指示信息,使用所述第三指示信 息指示所述 LTE网络和所述 2G或 3G网络是否支持为所述 CSFB将所述 UE从所 述 LTE网络切换到所述 2G或 3G网络的 CS域。
例如, 所述第三指示信息包含第一信元和第二信元, 所述第一信元用来指 示 CSFB, 所述第二信元用来指示所述 LTE网络和所述 2G或 3G网络是否支持将 所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域。
例如, 该第三指示信息可以为指示所述 LTE网络和所述 2G或 3G网络支 持单一无线语音呼叫连续性 SRVCC切换的指示信息。
本发明实施例中的第三指示信息可以称为优化 CSFB指示 (optimized CSFB indicator) , 基于单一无线语音呼叫连续性 ( single radio voice call continuity , SRVCC ) 的 CSFB指示(SRVCC based CSFB Indicator) , 增强的 CSFB指示 (enhanced CSFB indicator)或者增强 CSFB可能性指示 (enhanced CSFB possible) 或者 SRVCC操作可能性指示 (SRVCC Operation possible)„
S110、 eNB向 MME发送切换要求消息, 所述切换要求消息用于请求所述 MME为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域; 所述切换要求消息可以为所述 LTE网络到所述 2G或 3G网络的 PS域切换要 求消息, 或所述 LTE网络到所述 2G或 3G网络的 CS域切换要求消息,或所述 LTE 网络到所述 2G或 3G网络的 PS域和 CS域切换要求消息。
所述切换要求消息可以包含 UE能力信息, 用于指示 UE所支持的频段信 息、 接入能等等。 例如, 该 UE能力信息可以是类标识 2(classmark2)和类标识 3(classmark3)中的至少一个。 现有技术中, 当 UE不支持 LTE网络到 2G/3G网络
的 CS切换时, eNB不会将 UE的能力信息发给 MME, 因此 MME没有 UE的能力 信息,但 MME需要将所述 UE能力信息发送 MSC, 以便 MSC能执行到 2G/3G CS 切换。 在 MME在获取到 UE的能力信息之后, 可以发送给 MSC。 在本发明实施 例中, 通过切换请求消息可以将 UE能力信息传递给 MME。
切换要求消息可以包含第二指示信息, 所述第二指示信息指示所述 MME 为所述 CSFB将用户设备 UE从所述 LTE网络切换到所述 2G或 3G网络的电路交 换 CS域。 所述第二指示信息还可以指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络。 当第二指示信息没有指示所述 UE不支持从所述 LTE网络切 换到所述 2G或 3G网络时, 基站可以默认认为所述 UE不支持。 切换要求消息中 的源到目标容器中可以包含第五指示信息, 所述第五指示信息用于请求所述 2/3G网络的基站为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网 络的 CS域。 所述第五指示信息还可以指示所述 UE不支持从所述 LTE网络切换 到所述 2G或 3G网络。 例如, UE不支持从所述 LTE网络切换到所述 2G或 3G网络 即 UE不支持从所述 LTE网络切换到所述 2G或 3G网络的 PS域和 CS域。
当第二指示信息没有指示所述 UE不支持从所述 LTE网络切换到所述 2G或
3G网络时, MME可以默认认为所述 UE不支持。 当第五指示信息没有指示所述 UE不支持从所述 LTE网络切换到所述 2G或 3G网络时, 基站可以默认认为所述 UE不支持。 所述第二指示信息和所述第五指示信息可以称为 CSFB指示、 优化 CSFB指示、基于 SRVCC的 CSFB指示、增强的 CSFB指示或者增强 CSFB可能性 指示。
例如, 第二指示信息可以包含 CSFB指示字段, 或者 CSFB指示字段和 UE 能力字段。 CSFB指示字段指示所述 MME为所述 CSFB将 UE从所述 LTE网络切 换到所述 2G或 3G网络的电路交换 CS域。 UE能力字段表示所述 UE不支持从所 述 LTE网络切换到所述 2G或 3G网络。
例如, 第五指示信息可以包含 CSFB指示字段, 或者 CSFB指示字段和 UE 能力字段。 CSFB指示字段指示所述 2G或 3G网络的基站为所述 CSFB将 UE从所 述 LTE网络切换到所述 2G或 3G网络的电路交换 CS域。 UE能力字段表示所述 UE 不支持从所述 LTE网络切换到所述 2G或 3G网络。
例如:
a) 对于目标网络为 UTRAN网络, eNB在源 RNC到目标 RNC透明容器 (source RNC to target RNC transparent container)包含所述第五指示信 息。 可以利用现有源 RNC到目标 RNC透明容器中的 CSFB信息 (CSFB information)字段作为 CSFB指示字段。可以在源 RNC到目标 RNC透明 容器中增加一个字段作为 UE能力字段。
b)对于目标网络为 GERAN网络, eNB在旧 BSS到新 BSS信息 (old BSS to new BSS information)中包含所述第五指示信息。 可以在旧 BSS到新 BSS信息中增加 CSFB指示字段或 UE能力字段。
S115、 MME向 MSC发送第一切换请求消息, 所述第一切换请求消息用于 的 CS域。
该第一切换请求消息要求的切换是从 LTE网络到 2G或 3G网络的 CS域的切 换, 即该第一切换请求为 PS到 CS的切换请求。
所述 MSC收到该第一切换请求消息后, 就可以准备 CS语音资源, 并发送 第二切换请求消息指示 2G或 3G网络的基站准备 CS语音资源。
所述第一切换请求消息可以包含第一指示信息, 所述第一指示信息用于请 求所述 MSC为所述 CSFB将 UE从长期演进 LTE网络切换到所述 2G或 3G网络的 电路交换 CS域, 也就是说, 通过该第一指示信息表示该第一切换请求是为 CSFB而发送的。 第一指示信息还可以指示所述 UE不支持从所述 LTE网络切换 到所述 2G或 3G网络。该第一切换请求消息也可以不指示 CSFB, 此时 MSC缺省 认为第一切换请求是为 CSFB而发送的。
当 MME从 eNB收到 UE的能力信息后,所述第一切换请求消息可以包含 UE 能力信息, 以便 MSC能执行到 2G/3G CS切换。 例如, 该能力信息为类标识 classmark2和类标识 classmark3中的至少一个。
因为 UE不支持 LTE网络到 2G或 3G网络 CS域的切换,UE不会上报其支持的 语音编解码信息, 此时 MME可以根据切换的目标系统, 在第一切换请求消息 包含默认编解码信息。
第一切换请求消息中的第一指示信息可以称为 CSFB指示、优化 CSFB指示 (optimized CSFB indicator), 基于单一无线语音呼叫连续性 ( single radio voice call continuity , SRVCC )的 CSFB指示 (SRVCC based CSFB Indicator), 增强的 CSFB指示(enhanced CSFB indicator)或者增强 CSFB可能性指示(enhanced CSFB possible) o
因为该 STN-SR用于 IP多媒体子系统和 2/3G的电路域之间的语音切换, 而 对于本发明的实施例涉及电路会退,所以当所述第一切换请求消息中包含会话 转移号码-单接收机 ( Session Transfer Number-Single Radio, STN-SR )时, 所述 MSC忽略所述 STN-SR号码。
S120、 MSC向基站发送第二切换请求消息, 所述第二切换请求消息包含 用户设备 UE的第一标识, 所述第二切换请求消息用于请求所述基站为电路域 回落 CSFB将所述 UE切换到所述 2G或 3G网络的电路交换 CS域。
所述 UE第一标只为临时" i只另 ll码 (Temporary Mobile Subscriber Identity, TMSI)和 /或国际移动用户识别码 ( International Mobile Subscriber Identification Number, IMSI )。
所述第二切换请求消息可以包含第四指示信息,所述第四指示信息用于请 求所述基站为电路域回落 CSFB将所述 UE从 LTE网络切换到 2G或 3G网络的 CS 域。 第四指示信息还可以指示所述 UE不支持从所述 LTE网络切换到所述 2G或 3G网络。
S121、 基站向 MSC发送的第二切换请求确认消息。
可选地, 所述第二切换请求确认消息包含无线接入承载 RAB , 所述 RAB 用于所述 UE为所述 CSFB而从所述 LTE网络切换到所述 2G或 3G网络的 PS域。
例如,所述 RAB为域标识为分组交换域的 RAB,或者所述 RAB为 PS RAB。 例如,所述 RAB为域标识为分组交换域的 RAB可以为 CS RAB,但所述 CS RAB 中的域标识为分组交换域。当 UE不支持从 LTE网络到 2G/3G网络的 CS域的切换 时, UE可以使用该 RAB从 LTE网络切换到 2G/3G网络的 PS域, 也就意味着, 此 时 UE已经移动到了 2G/3G网络, 然后 UE就可以在 2G/3G网络中发起 CS呼叫。
注意, 除了 CS呼叫之外, UE在 2/3G网络还可以发起 CS补充业务请求, 比
如定位业务请求, 或者 USSD ( UnstructuredSupplementaryServiceData , 非结构 化补充数据业务业务请求。也就是说, UE从 LTE网络执行电路回退可以是因为 UE要在 2/3G网络发起 CS呼叫或者发起 CS补充业务请求。基站收到第二切换请 求消息后, 可以生成 CS RAB。 当 UE回落到 CS域后发起的 CS呼叫可以使用该 CS RAB。 但是, 所述第二切换请求确认消息可以不包含所述 CS RAB。
可选地,基站可以根据第四指示信息中包含的 UE的能力确定该 UE不支持 从 LTE到 2G或 3G网络的切换。基站也可以缺省认为 UE不支持到 2G或 3G网络的 切换, 从而不必判断。
S125、 MSC向 MME发送第一切换请求响应消息。
S130、 MME向 eNB发送切换要求响应, 所述 eNB忽略所述切换要求响应。
S135、 eNB向 UE发送 RRC重定向消息。
具体说来, 该 RRC重定向消息为 RRC Release with Redirction或者 RRC Release 消息。 除了发送 RRC重定向消息, eNB也可以发送其他消息将 UE移动 到 2G或 3G网络, 比如 NACC消息 (Network Assisted Cell Change, 网络辅助的小 区改变), CCO消息 (Cell Change Order, 小区改变命令)。 需要注意的是, eNB 在收到 S105中的第一通知消息后, eNB就可以执行 S135。 举例来说:
a) eNB接受 S105中的第一通知消息之后,发送 S135中的 RRC重定向消息给 UE。
b) eNB在发送 SI 10中的切换要求消息之后,发送 S 135中的 RRC重定向消息 给 UE。
c) eNB接收 S130中的切换要求响应消息之后,发送 S135中的 RRC重定向消 息给 UE。
S 140、 UE根据 RRC重定向消息, 为所述 CSFB从所述 LTE网络接入到所述 2G或 3G网络。 也就是, UE从 LTE网络移动到 2G或 3G网络。
S145、 UE向基站(BSC或者 RNC )发送空口建立过程。
所述基站接收所述 UE移动到所述 2G或 3G网络后发送的无线连接请求消 息, 建立与所述 UE之间的无线连接;
所述基站从所述 UE获取所述 UE的第二标识,所述基站确定所述第一标识
和第二标识相同。
所述无线连接请求消息为信道请求 Channel Request消息或者无线资源控 制连接建立 RRC Connection Setup消息。
S150、 可选地, 基站 (BSC或者 RNC ) 向 MSC发送换完成消息 ( HO Complete )。
所述基站在接收所述 UE发送给所述 MSC的信令消息后,所述 2G或 3G网络 的基站使用在所述 LTE网络到所述 2G或 3G网络的电路交换 CS域的切换过程中 建立的连接将所述信令消息发送给所述 MSC。
或者, 所述基站使用直传消息将所述信令消息发送给所述 MSC。
S155、 UE向 MSC发送连接管理业务请求( CM Service Request )。
S160、 可选地, MSC向 UE发送鉴权请求( Authenticate Request )。
S165、 可选地, UE向 MSC发送鉴权响应 ( Authenticate Response )。
S170、 MSC向基站发送安全模式命令 (Security mode command), 携带完整 生保护信息、 (Integrity Protection Information)和 /或力口密信息、 (Encryption Information), 以便基站发送安全模式命令给 UE。
本步骤 S170也可以不执行, 即: 所述 MSC不向所述基站发送安全模式命 令。
S175、 基站发送安全模式命令给 UE。 具体说来, 基站根据步骤 S170中的 安全模式命令, 执行本步骤, 或者基站在接收到 S145消息后, 执行本步骤。
S180、 可选地, MSC向 UE发送连接管理业务命令。
S185、 UE向 MSC发送第一 CS呼叫连接建立请求消息, 所述第一 CS呼叫连 接建立请求消息用于请求所述 MSC为所述 CSFB生成第一会话。
S 185a、 MSC发送呼叫处理中(call proceeding)消息给 UE。
S190、 MSC进行呼叫的对端处理。
S190a、基站向 UE发送第三通知消息, 所述第三通知消息包含所述基站根 据所述第二切换请求消息为所述 UE分配的 CS域 RAB。 UE可以向基站发送第三 通知响应消息。
为了与 UE的现有处理流程最大限度匹配, 减少异常, 避免呼叫失败, 在
所述基站接收所述 MSC发送的呼叫处理消息或者或者所述 UE发送的呼叫建立 消息后, 所述基站向所述 UE发送第三通知消息, 所述第三通知消息包含所述 基站为所述 UE分配的 CS域 RAB。 所述第三通知消息可以为无线承载建立或者 无线承载重配置消息。 UE可以使用 CS RAB进行语音通话。
所述基站也可以在接收到 MSC发送的第二通知消息后发送所述第三通知 消息。 所述 MSC接收到至少一条下列消息之后发送第二通知消息给所述基站, 所述第二通知消息用于请求所述基站为所述 UE分配 CS域资源;
其中, 所述下列消息包括: 所述基站发送的切换完成消息, 所述 UE发送 的连接管理业务请求消息, 所述 UE发送的所述第一 CS呼叫连接请求消息。
S195、 MSC发送振铃 (Alerting)消息给 UE。 UE等待对端应答消息。
进一步, 被叫摘机, 进入通话状态。
当呼叫结束后,由于该呼叫是由 CSFB触发的, UE完成呼叫后需要回到 LTE 网络。 基站根据第二切换请求消息, 所述基站确定该呼叫是由 CSFB触发的, 因此, 所述 2/3G网络的基站在接收到所述 MSC发送的呼叫释放消息后; 所述 2/3G网络的基站将所述 UE重定向到所述 LTE网络, 或者, 所述基站将所述 UE 切换到所述 LTE网络,所述呼叫释放消息为释放命令 Iu Release Command或清除 命令 Clear Command。
需要说明的是, 本实施例中, 基站可以解析 UE和 MSC之间的 CS信令。 基站接收 UE发送给 MSC的信令消息, 例如连接管理业务请求、鉴权响应、 第一 CS呼叫连接建立请求消息等信令消息。 基站可以使用在 LTE网络到 2G或 3G网络的 CS域的切换过程中建立的连接将该信令消息发送给 MSC , 或者使用 直传消息将该信令消息发送给 MSC。
本实施例中, 第一指示信息、 第二指示信息、 第四指示信息、 第五指示信 息可以包含 CSFB指示字段, 或者 CSFB指示字段和 UE能力字段。 CSFB指示字 段指示所述 MME为所述 CSFB将 UE从所述 LTE网络切换到所述 2G或 3G网络的 电路交换 CS域。 UE能力字段表示所述 UE不支持从所述 LTE网络切换到所述 2G 或 3G网络。
在图 1中, 对于不支持从 LTE网络切换到 2G或 3G网络的 UE, 在 UE从 LTE
网络重定向到 2G或 3G网络时, 网络触发了从 LTE网络切换到 2G或 3G网络的 CS 域, 从而网络能够提前准备 CS域的语音资源, 缩短语音呼叫时长。
参阅图 2 ,图 2为本发明实施例中网络切换过程及网络切换后的被动呼叫过 程:
S0b-S0c: MSC发送 CS寻呼请求给 MME, MME触发寻呼过程。
步骤 S200-S280和图 1中的步骤 S100-S180相同, 在此不再做详细赘述。
S285、 MSC向 UE发送第二 CS呼叫连接建立请求消息, 所述第二 CS呼叫连 接建立请求消息用于请求所述 UE为所述 CSFB生成第二会话。
注意, 除了 CS呼叫之外, MSC还可以在 2/3G网络向 UE发起 CS补充业务请 求, 比: ¾口定位业务请求, 或者 USSD ( UnstructuredSupplementaryServiceData , 非结构化补充数据业务业务请求。也就是说, UE从 LTE网络执行电路回退可以 是因为 MSC要在 2/3G网络发起 CS呼叫或者发起 CS补充业务请求。
S285a、 MSC接收 UE发送的呼叫确认消息。
S290、 MSC进行呼叫的对端处理。
S290a、 基站向 UE发送第三通知消息。 UE可以向基站发送第三通知响应 消息。
为了与 UE的现有处理流程最大限度匹配, 减少异常, 避免呼叫失败, 在 所述基站接收所述 MSC发送的呼叫建立消息或者所述 UE发送的呼叫确认消息 后, 所述基站向所述 UE发送第三通知消息, 所述第三通知消息包含所述基站 为所述 UE分配的 CS域 RAB。 所述第三通知消息可以为无线^载建立或者无线 承载重配置消息。 UE可以使用 CS RAB进行语音通话。
所述基站也可以在接收到 MSC发送的第二通知消息后发送所述第三通知 消息。 所述 MSC接收到至少一条下列消息之后发送第二通知消息给所述基站, 所述第二通知消息用于请求所述基站为所述 UE分配 CS域资源;
其中, 所述下列消息包括: 所述基站发送的切换完成消息, 所述 UE发送 的寻呼响应, 所述 MSC发送的所述第二 CS呼叫连接请求消息。
S295、 MSC向 UE发送振铃 (Alerting)消息。
UE摘机, 进入通话状态。
当呼叫结束后,由于该呼叫是由 CSFB触发的, UE完成呼叫后需要回到 LTE 网络。 基站根据第二切换请求消息, 所述基站确定该呼叫是由 CSFB触发的, 因此, 所述 2/3G网络的基站在接收到所述 MSC发送的呼叫释放消息后; 所述 2/3G网络的基站将所述 UE重定向到所述 LTE网络, 或者, 所述基站将所述 UE 切换到所述 LTE网络,所述呼叫释放消息为释放命令 Iu Release Command或清除 命令 Clear Command。
需要说明的是, 本实施例中, 基站可以解析 UE和 MSC之间的 CS信令。 基 站接收 UE发送给 MSC的信令消息, 例如呼叫确认消息、 鉴权响应、 第二 CS呼 叫连接建立请求消息等信令消息。 基站可以使用在 LTE网络到 2G或 3G网络的 CS域的切换过程中建立的连接将该信令消息发送给 MSC , 或者使用直传消息 将该信令消息发送给 MSC。
本实施例中, 第一指示信息、 第二指示信息、 第四指示信息、 第五指示信 息可以包含 CSFB指示字段, 或者 CSFB指示字段和 UE能力字段。 CSFB指示字 段指示所述 MME为所述 CSFB将 UE从所述 LTE网络切换到所述 2G或 3G网络的 电路交换 CS域。 UE能力字段表示所述 UE不支持从所述 LTE网络切换到所述 2G 或 3G网络。
在图 2中, 对于不支持从 LTE网络切换到 2G或 3G网络的 UE , 在 UE从 LTE 网络重定向到 2G或 3G网络时, 网络触发了从 LTE网络切换到 2G或 3G网络的 CS 域, 从而网络能够提前准备 CS域的语音资源, 缩短语音呼叫时长。
以上两个应用场景中分别从 UE主叫和 UE被叫的两个方面描述了整个网 络切换和会话的过程。
参阅图 3, 本发明实施例提供的网络切换的方法的一实施例包括:
101、移动管理实体 MME接收到位于长期演进 LTE网络的用户设备 UE发起 的请求消息, 所述请求消息用于请求电路域回落 CSFB。
102、 根据所述请求消息, 所述 MME向演进基站 eNB发送第一通知消息, 所述第一通知消息用于指示所述 eNB为所述 CSFB将所述 UE从所述 LTE网络移 动到 2G或 3G网络。
103、 所述 MME接收所述 eNB发送的切换要求消息。
104、所述 MME向移动交换中心 MSC发送第一切换请求消息, 所述第一切 换请求消息用于请求所述 MSC将所述 UE从所述 LTE网络切换到所述 2G或 3G 网络的电路交换 CS域。 所对应的实施例中的描述, 此处不再赘述。
与现有技术中相比, 本发明实施例提供的方法, 对于不支持从 LTE网络切 换到 2G或 3G网络的 UE, 在 UE从 LTE网络重定向到 2G或 3G网络时, 网络触发 了从 LTE网络切换到 2G或 3G网络的 CS域, 从而网络能够提前准备 CS域的语音 资源, 缩短语音呼叫时长。
参阅图 4, 本发明实施例提供的网络切换的方法的另一实施例包括:
201、 移动交换中心 MSC接收移动管理实体 MME发送的第一切换请求消 息, 所述第一切换请求消息用于请求所述 MSC为电路域回落 CSFB将用户设备 UE从长期演进 LTE网络切换到 2G或 3G网络的电路交换 CS域。
202、所述 MSC向所述 2G或 3G网络的基站发送第二切换请求消息,所述第 二切换请求消息用于请求所述基站为所述 CSFB将所述 UE从所述 LTE网络切换 到所述 2G或 3G网络的 CS域, 所述第二切换请求消息包含所述 UE的标识, 以便 所述基站根据所述标识向所述 UE发送所述基站根据所述第二切换请求消息分 配的 CS域无线接入承载 RAB。
203、 所述 MSC接收所述 2G或 3G网络的基站发送的第二切换请求确认消 息。
204、 所述 MSC接收所述基站发送的切换完成消息, 所述切换完成消息用 于指示所述 UE已经从所述 LTE网络移动到所述 2G或 3G网络。
所述 MSC收到至少一条下列消息之后, 或者发送所述第二 CS呼叫连接请 求消息之后,发送第二通知消息给所述基站, 所述第二通知消息用于请求所述 基站为所述 UE分配 CS域资源: 其中, 所述至少一条下列消息包括: 所述基站 发送的切换完成消息, 所述 UE发送的连接管理业务请求消息, 所述 UE发送的 所述第一 CS呼叫连接请求, 所述 UE发送的寻呼响应消息。
所对应的实施例中的描述, 此处不再赘述。
与现有技术中相比, 本发明实施例提供的方法, 对于不支持从 LTE网络切 换到 2G或 3G网络的 UE, 在 UE从 LTE网络重定向到 2G或 3G网络时, 网络触发 了从 LTE网络切换到 2G或 3G网络的 CS域, 从而网络能够提前准备 CS域的语音 资源, 缩短语音呼叫时长。
参阅图 5 , 本发明实施例提供的网络切换的方法的另一实施例包括:
301、 2G或 3G网络的基站接收移动交换中心 MSC发送的第二切换请求消 息, 所述第二切换请求消息包含用户设备 UE的第一标识, 所述第二切换请求 消息用于请求所述基站为电路域回落 CSFB将所述 UE切换到所述 2G或 3G网络 的电路交换 CS域。
302、 所述基站接收所述 UE移动到所述 2G或 3G网络后发送的无线连接请 求消息, 建立与所述 UE之间的无线连接。
303、 所述基站从所述 UE获取所述 UE的第二标识。
304、 所述基站确定所述第一标识和第二标识相同; 所述基站向所述 UE发 送第三通知消息,所述第三通知消息包含所述基站根据所述第二切换请求消息 为所述 UE分配的 CS域 RAB。
本实施例中基站的上述处理步骤以及其他处理步骤, 可以参见图 1或图 2 所对应的实施例中的描述, 此处不再赘述。
与现有技术中相比, 本发明实施例提供的方法, 对于不支持从 LTE网络切 换到 2G或 3G网络的 UE, 在 UE从 LTE网络重定向到 2G或 3G网络时, 网络触发 了从 LTE网络切换到 2G或 3G网络的 CS域, 从而网络能够提前准备 CS域的语音 资源, 缩短语音呼叫时长。
参阅图 6, 本发明实施例提供的网络切换的方法的另一实施例包括: 401、 位于长期演进 LTE网络的演进基站 eNB接收移动管理实体 MME发送 来的第一通知消息, 所述第一通知消息用于指示所述 eNB为电路域回落 CSFB 将用户设备 UE从所述 LTE网络移动到 2G或 3G网络。
402、 所述 eNB向所述 MME发送切换要求消息, 所述切换要求消息用于为 所述 CSFB发起从所述 LTE网络到所述 2G或 3G网络的 CS域的切换。
403、 所述 eNB指示所述 UE从所述 LTE网络重定向到 2G或 3G网络, 以便所 述 UE从所述 LTE网络移动到所述 2G或 3G网络。
本实施例中演进基站的上述处理步骤以及其他处理步骤, 可以参见图 1或 图 2所对应的实施例中的描述, 此处不再赘述。
与现有技术中相比, 本发明实施例提供的方法, 对于不支持从 LTE网络切 换到 2G或 3G网络的 UE, 在 UE从 LTE网络重定向到 2G或 3G网络时, 网络触发 了从 LTE网络切换到 2G或 3G网络的 CS域, 从而网络能够提前准备 CS域的语音 资源, 缩短语音呼叫时长。
参阅图 7, 本发明实施例提供的移动管理实体的一实施例包括: 接收单元 501、 生成单元 502和发送单元 503。
接收单元 501 , 用于接收到位于长期演进 LTE网络的用户设备 UE发起的请 求消息, 所述请求消息用于请求电路域回落 CSFB。
生成单元 502, 用于根据所述接收单元接收的所述请求消息, 生成第一通 知消息, 所述第一通知消息用于指示所述演进基站 eNB为所述 CSFB将所述 UE 从所述 LTE网络移动到 2G或 3G网络。
发送单元 503 , 用于向演进基站 eNB发送所述第一通知消息。
所述接收单元 501 , 还用于接收所述 eNB发送的切换要求消息。
所述生成单元 502, 还用于根据所述接收单元接收的所述切换要求消息, 生成第一切换请求消息, 所述第一切换请求消息用于请求所述 MSC将所述 UE 从所述 LTE网络切换到所述 2G或 3G网络的 CS域。
所述发送单元 503, 还用于向移动交换中心 MSC发送所述第一切换请求消 息。
对于本实施例中的移动管理实体可以执行图 1、 图 2、 图 3方法实施例中描
与现有技术中相比, 本发明实施例提供的移动管理实体, 对于不支持从 LTE网络切换到 2G或 3G网络的 UE , 在 UE从 LTE网络重定向到 2G或 3G网络时, 网络触发了从 LTE网络切换到 2G或 3G网络的 CS域, 从而网络能够提前准备 CS
域的语音资源, 缩短语音呼叫时长。
参阅图 8, 本发明实施例提供的一种移动交换中心 MSC的一实施例包括: 接收单元 601、 生成单元 602、 发送单元 603。
接收单元 601 , 用于接收移动管理实体 MME发送的第一切换请求消息, 所 述第一切换请求消息用于请求所述 MSC为电路域回落 CSFB将用户设备 UE从 长期演进 LTE网络切换到 2G或 3G网络的电路交换 CS域。
生成单元 602, 用于根据所述接收单元接收的所述第一切换请求消息, 生 成第二切换请求消息, 所述第二切换请求消息用于请求所述 2G或 3G网络的基 站为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域, 所 述第二切换请求消息包含所述 UE的标识, 以便所述基站根据所述标识向所述 UE发送所述基站根据所述第二切换请求消息分配的 CS域无线接入承载 RAB。
发送单元 603 , 用于向所述 2G或 3G网络的基站发送所述第二切换请求消 息。
所述接收单元 601 ,还用于接收所述 2G或 3G网络的基站发送的第二切换请 求确认消息。
所述接收单元 601 , 还用于接收所述基站发送的切换完成消息, 所述切换 完成消息用于指示所述 UE已经从所述 LTE网络移动到所述 2G或 3G网络。
所述接收单元 601 , 还用于接收所述 UE发送的第一 CS呼叫连接请求消息。 所述生成单元 602, 还用于根据所述接收单元接收的所述第一 CS呼叫连接 请求消息为所述 CSFB为所述 UE生成第一会话。
所述发送单元 603,还用于向所述 UE发送第二 CS呼叫连接请求消息,所述 第二 CS呼叫连接请求消息用于请求所述 UE为所述 CSFB生成第二会话。
所述接收单元 601 ,还用于接收所述 UE发送的连接管理业务请求消息和寻 呼响应消息。
所述发送单元 603 , 还用于在收到至少一条下列消息之后, 发送第二通知 消息给所述基站, 所述第二通知消息用于请求所述基站为所述 UE分配 CS域资 源, 其中, 所述下列消息包括: 所述切换完成消息, 所述连接管理业务请求消 息, 所述第一 CS呼叫连接请求消息, 所述寻呼响应消息。
所述发送单元 603, 还用于在所述发送单元发送所述第二 CS呼叫连接请求 消息之后,发送所述生成单元生成的第二通知消息给所述基站, 所述第二通知 消息用于请求所述基站为所述 UE分配 CS域资源。
对于本实施例中的 MSC可以执行图 1、 图 2、 图 4方法实施例中描述的 MSC
与现有技术中相比, 本发明实施例提供的移动交换中心, 对于不支持从 LTE网络切换到 2G或 3G网络的 UE, 在 UE从 LTE网络重定向到 2G或 3G网络时, 网络触发了从 LTE网络切换到 2G或 3G网络的 CS域, 从而网络能够提前准备 CS 域的语音资源, 缩短语音呼叫时长。
参阅图 9, 本发明实施例提供的 2G或 3G网络的基站的一实施例包括: 接收 单元 701、 处理单元 702、 发送单元 703。
接收单元 701 , 用于接收移动交换中心 MSC发送的第二切换请求消息, 所 述第二切换请求消息包含用户设备 UE的第一标识, 所述第二切换请求消息用 于请求所述基站将所述 UE切换到所述 2G或 3G网络的电路交换 CS域。
所述接收单元 701 , 还用于接收所述 UE移动到所述 2G或 3G网络后发送的 无线连接请求消息。
处理单元 702,用于根据所述接收单元 701接收的所述无线连接请求消息建 立与所述 UE之间的无线连接。
所述处理单元 702, 还用于从所述 UE获取所述 UE的第二标识, 确定所述 第一标识和第二标识相同。
所述处理单元 702,还用于根据所述接收单元 701接收的所述第二切换请求 消息为所述 UE分配 CS域无线接入承载 RAB。
所述处理单元 702, 还用于生成第三通知消息, 所述第三通知消息包含所 述 CS域 RAB。
发送单元 703, 用于向所述 UE发送第三通知消息。
所述处理单元 702,还用于确定所述 UE不支持从 LTE网络到 2G或 3G网络的 切换。
所述接收单元 701 ,还用于接收所述 UE发送给所述 MSC的信令消息,其中, 所述处理单元用于从所述无线连接请求消息或所述信令消息提取所述第二标 识。
或者,
所述发送单元 703 , 还用于发送标识请求消息给所述 UE; 所述接收单元
701 , 还用于接收所述 UE发送的标识请求响应消息, 其中, 所述处理单元 702 用于从所述标识请求响应消息提取所述第二标识。
所述接收单元 701 ,还用于接收所述 UE发送的呼叫建立消息或者呼叫确认 消息, 或者, 接收所述 MSC发送的呼叫处理消息; 其中, 所述发送单元 703是 在所述接收单元 701接收所述 UE发送的呼叫建立消息或者呼叫确认消息后,或 者在所述接收单元接收所述 MSC发送的呼叫处理消息后,发送所述第三通知消 息给所述 UE的。
所述发送单元 703,还用于向所述 UE发送通用移动通信系统陆地无线接入 网 UTRAN移动性信息, 所述 UTRAN移动性信息不包含位置域标识 LAI, 在预 定的时间后, 向所述 UE发送 LAI。
所述发送单元 703,还用于向所述 UE发送通用移动通信系统陆地无线接入 网 UTRAN移动性信息, 所述 UTRAN移动性信息不包含位置域标识 LAI; 所述 接收单元 701 , 还用于接收所述 MSC发送的呼叫释放命令或者呼叫连接接通消 息或者所述 UE发送的呼叫连接接通消息; 所述发送单元 703, 还用于在所述接 收单元 701接收所述呼叫释放命令或者所述呼叫连接接通消息之后向所述 UE 发送 LAI。
所述接收单元 701 , 还用于接收所述 MSC发送的呼叫释放消息, 所述处理 单元 703, 还用于根据所述呼叫释放消息将所述 UE重定向到所述 LTE网络, 或 者根据所述呼叫释放消息将所述 UE切换到所述 LTE网络。
所述接收单元 701 , 还用于接收所述 UE发送的位置更新请求消息, 所述处 理单元 702, 还用于确定不向所述 MSC发送所述位置更新请求消息, 所述发送 单元 703,还用于在确定不向所述 MSC发送所述位置更新请求消息时向所述 UE 发送所述位置更新请求消息。
对于本实施例中的基站可以执行图 1、 图 2、 图 5方法实施例中描述的基站 站中各单元执行的动作以及各单元之间的关系。
与现有技术中相比, 本发明实施例提供的基站, 对于不支持从 LTE网络切 换到 2G或 3G网络的 UE, 在 UE从 LTE网络重定向到 2G或 3G网络时, 网络触发 了从 LTE网络切换到 2G或 3G网络的 CS域, 从而网络能够提前准备 CS域的语音 资源, 缩短语音呼叫时长。
参阅图 10, 本发明实施例提供的演进基站 80的一实施例包括: 接收单元 801、 生成单元 802、 发送单元 803和确定单元 804。
接收单元 801 , 用于接收移动管理实体 MME发送来的第一通知消息, 所述 第一通知消息用于指示所述 eNB为电路域回落 CSFB将用户设备 UE从所述 LTE 网络移动到 2G或 3G网络。
生成单元 802,用于根据所述接收单元 801接收的所述第一通知消息生成切 换要求消息, 所述切换要求消息用于为所述 CSFB发起从所述 LTE网络到所 述 2G或 3G网络的 CS域的切换。
发送单元 803, 用于向所述 MME发送所述切换要求消息。
所述发送单元 803, 还用于向所述 UE发送重定向请求消息, 所述重定向请 求消息指示所述 UE从所述 LTE网络重定向到所述 2G或 3G网络。
确定单元 804, 用于在所述发送单元 803向所述 MME发送所述切换要求消 息之前, 确定所述 UE不支持从所述 LTE网络到所述 2G或 3G网络的切换; 和 / 或, 用于在所述发送单元发送所述重定向请求消息之前, 确定所述 UE不支持 从所述 LTE网络到所述 2G或 3G网络的切换。
对于本实施例中的演进基站可以执行图 1、 图 2、 图 6方法实施例中描述的
与现有技术中相比, 本发明实施例提供的演进基站, 对于不支持从 LTE网 络切换到 2G或 3G网络的 UE, 在 UE从 LTE网络重定向到 2G或 3G网络时, 网络 触发了从 LTE网络切换到 2G或 3G网络的 CS域, 从而网络能够提前准备 CS域的
语音资源, 缩短语音呼叫时长。
本领域技术人员能够理解, 上述图 7 - 10的实施例中, 用于发送消息的发 送单元可以采用发送器实现, 用于接收消息的接收单元可以采用接收器实现。 或者, 发送单元和接收单元都可以采用收发器实现。 在物理实现上, 发送器或 者收发器可以用一个物理实体实现,也可采用多个物理实体实现,发送器和收 发器可以采用一个物理实体实现,也可以采用多个物理实体实现, 本发明对此 不做限制。 其他单元, 如生成单元、 处理单元、 确定单元等单元可以采用一个 或多个处理器实现, 本发明对此不做限制, 处理器执行的本发明实施例中的程 序可以存储在存储器中。
参阅图 11 , 本发明实施例提供的网络切换系统, 包括: 移动管理实体 50、 演进基站 80、 移动交换中心 60、 基站 70和用户设备 90。
移动管理实体 50、 演进基站 80、 移动交换中心 60、 基站 70和用户设备 90 各自执行的动作以及它们之间的交互, 可以参见图 1和图 2的描述, 以及图 3至 图 10的方法实施例和装置实施例的描述, 此处不再赘述。 本领域普通技术人员可以意识到,结合本文中所公开的实施例描述的各示 例的单元及算法步骤, 能够以电子硬件、 计算机软件或者二者的结合来实现, 为了清楚地说明硬件和软件的可互换性,在上述说明中已经按照功能一般性地 描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行,取决 于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用 来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本发明的范 围。 所属领域的技术人员可以清楚地了解到, 为了描述的方便和筒洁, 上述描 述的系统、装置和单元的具体工作过程, 可以参考前述方法实施例中的对应过 程, 在此不再赘述。 在本申请所提供的几个实施例中, 应该理解到, 所揭露的系统、 装置和方 法, 可以通过其它的方式实现。 例如, 以上所描述的装置实施例仅仅是示意性 的, 例如, 所述单元的划分, 仅仅为一种逻辑功能划分, 实际实现时可以有另
外的划分方式, 例如多个单元或组件可以结合或者可以集成到另一个系统, 或 一些特征可以忽略, 或不执行。 另外, 所显示或讨论的相互之间的耦合或直接 耦合或通信连接可以是通过一些接口、装置或单元的间接耦合或通信连接, 也 可以是电的, 机械的或其它的形式连接。 所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为 单元显示的部件可以是或者也可以不是物理单元, 即可以位于一个地方, 或者 也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部 单元来实现本发明实施例方案的目的。 另外, 在本发明各个实施例中的各功能单元可以集成在一个处理单元中, 也可以是各个单元单独物理存在,也可以是两个或两个以上单元集成在一个单 元中。上述集成的单元既可以采用硬件的形式实现,也可以采用软件功能单元 的形式实现。 所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售 或使用时, 可以存储在一个计算机可读取存储介质中。基于这样的理解, 本发 明的技术方案本质上或者说对现有技术做出贡献的部分,或者该技术方案的全 部或部分可以以软件产品的形式体现出来,该计算机软件产品存储在一个存储 介质中, 包括若干指令用以使得一台计算机设备(可以是个人计算机,服务器, 或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。 而前述 的存储介质包括: U盘、 移动硬盘、 只读存储器(ROM, Read-Only Memory )、 随机存取存储器(RAM, Random Access Memory ), 磁碟或者光盘等各种可以 存储程序代码的介质。
以上所述,仅为本发明的具体实施方式,但本发明的保护范围并不局限于 此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易想到 各种等效的修改或替换, 这些修改或替换都应涵盖在本发明的保护范围之内。 因此, 本发明的保护范围应以权利要求的保护范围为准。
Claims
1、 一种网络切换的方法, 其特征在于, 包括:
移动管理实体 MME接收到位于长期演进 LTE网络的用户设备 UE发起的请 求消息, 所述请求消息用于请求电路域回落 CSFB;
根据所述请求消息, 所述 MME向演进基站 eNB发送第一通知消息, 所述 第一通知消息用于指示所述 eNB为所述 CSFB将所述 UE从所述 LTE网络移动到 2G或 3G网络;
所述 MME接收所述 eNB发送的切换要求消息;
所述 MME向移动交换中心 MSC发送第一切换请求消息, 所述第一切换请 求消息用于请求所述 MSC将所述 UE从所述 LTE网络切换到所述 2G或 3G网络 的电路交换 CS域。
2、 根据权利要求 1所述的方法, 其特征在于,
所述第一切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络。
3、 根据权利要求 1或 2所述的方法, 其特征在于,
所述切换要求消息用于指示所述 MME为所述 CSFB将所述 UE从所述 LTE 网络切换到所述 2G或 3G网络的 CS域;
或者, 所述切换要求消息用于指示所述 MME为所述 CSFB将所述 UE从所 述 LTE网络切换到所述 2G或 3G网络的 CS域, 并且还用于指示所述 UE不支持从 所述 LTE网络切换到所述 2G或 3G网络。
4、 根据权利要求 1 - 3任一所述的方法, 其特征在于,
所述第一通知消息还用于指示所述 LTE网络和所述 2G或 3G网络支持为所 述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域。
5、 根据权利要求 4所述的方法, 其特征在于, 所述 LTE网络和所述 2G 网络的 CS域, 包括:
所述 LTE网络和所述 2G或 3G网络支持单一无线语音呼叫连续性 SRVCC 切换。
6、 一种网络切换的方法, 其特征在于, 包括:
移动交换中心 MSC接收移动管理实体 MME发送的第一切换请求消息, 所 述第一切换请求消息用于请求所述 MSC为电路域回落 CSFB将用户设备 UE从 长期演进 LTE网络切换到 2G或 3G网络的电路交换 CS域;
所述 MSC向所述 2G或 3G网络的基站发送第二切换请求消息, 所述第二切 换请求消息用于请求所述基站为所述 CSFB将所述 UE从所述 LTE网络切换到所 述 2G或 3G网络的 CS域, 所述第二切换请求消息包含所述 UE的标识, 以便所述 基站根据所述标识向所述 UE发送所述基站根据所述第二切换请求消息分配的 CS域无线接入承载 RAB;
所述 MSC接收所述基站发送的第二切换请求确认消息;
所述 MSC接收所述基站发送的切换完成消息,所述切换完成消息用于指示 所述 UE已经从所述 LTE网络移动到所述 2G或 3G网络。
7、 根据权利要求 6所述的方法, 其特征在于, 还包括:
所述 MSC接收所述 UE发送的第一 CS呼叫连接请求消息, 所述 MSC为所述 UE生成第一会话。
8、 根据权利要求 6所述的方法, 其特征在于, 还包括:
所述 MSC向所述 UE发送第二 CS呼叫连接请求消息, 所述第二 CS呼叫连接 请求消息用于请求所述 UE生成第二会话。
9、 根据权利要求 7所述的方法, 其特征在于, 所述方法还包括:
所述 MSC收到至少一条下列消息之后,发送第二通知消息给所述基站,所 述第二通知消息用于请求所述基站为所述 UE分配 CS域资源,
其中, 所述下列消息包括: 所述切换完成消息, 所述 UE发送的连接管理 业务请求消息,所述第一 CS呼叫连接请求消息, 所述 UE发送的寻呼响应消息。
10、 根据权利要求 8所述的方法, 其特征在于, 所述方法还包括: 所述 MSC发送所述第二 CS呼叫连接请求消息之后, 发送第二通知消息给 所述基站, 所述第二通知消息用于请求所述基站为所述 UE分配 CS域资源。
11、 根据权利要求 6 - 10任一所述的方法, 其特征在于,
所述第二切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到
所述 2G或 3G网络; 或者,
所述第一切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络。
12、 一种网络切换的方法, 其特征在于, 包括:
2G或 3G网络的基站接收移动交换中心 MSC发送的第二切换请求消息, 所 述第二切换请求消息包含用户设备 UE的第一标识, 所述第二切换请求消息用 于请求所述基站为电路域回落 CSFB将所述 UE切换到所述 2G或 3G网络的电路 交换 CS域;
所述基站接收所述 UE移动到所述 2G或 3G网络后发送的无线连接请求消 息, 建立与所述 UE之间的无线连接;
所述基站从所述 UE获取所述 UE的第二标识;
所述基站确定所述第一标识和第二标识相同; 所述基站向所述 UE发送第 三通知消息,所述第三通知消息包含所述基站根据所述第二切换请求消息为所 述 UE分配的 CS域 RAB。
13、 根据权利要求 12所述的方法, 其特征在于,
所述第二切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络。
14、 根据权利要求 12或 13所述的方法, 其特征在于, 所述基站从所述 UE 获取所述 UE的第二标识, 包括:
所述基站从所述 UE发送的无线连接请求消息中提取所述第二标识; 或者, 所述基站从所述 UE发送给所述 MSC的信令消息中提取所述第二标识; 或 者,
所述基站发送标识请求消息给所述 UE, 所述基站接收所述 UE发送的标识 请求响应消息, 所述基站从所述标识请求响应消息中提取所述 UE的标识。
15、 根据权利要求 12-14任一所述的方法, 其特征在于,
在所述基站接收所述 UE发送的呼叫建立消息或者呼叫确认消息后, 所述 基站发送所述第三通知消息给所述 UE;
或者在所述基站接收所述 MSC发送的呼叫处理消息后,所述基站发送所述
第三通知消息给所述 UE。
16、 根据权利要求 12-15任一所述的方法, 其特征在于, 所述方法还包括: 在所述基站接收所述无线连接请求消息之后, 所述基站向所述 UE发送通 用移动通信系统陆地无线接入网 UTRAN移动性信息,所述 UTRAN移动性信息 不包含位置域标识 LAI, 在预定的时间后, 所述基站向所述 UE发送 LAI;
或者, 在所述基站接收所述无线连接请求消息之后, 所述基站向所述 UE 发送 UTRAN移动性信息, 所述 UTRAN移动性信息不包含位置域标识 LAI, 在 接收所述 MSC发送的呼叫释放命令或者呼叫连接接通消息或者所述 UE发送的 呼叫连接接通消息之后, 所述基站向所述 UE发送 LAI。
17、根据权利要求 12 - 16任一所述的方法,其特征在于,所述方法还包括: 所述基站接收所述 UE发送的位置更新请求消息,
所述基站确定不向所述 MSC发送所述位置更新请求消息,并发送位置更新 接受消息给所述 UE。
18、 一种网络切换的方法, 其特征在于, 包括:
位于长期演进 LTE网络的演进基站 eNB接收移动管理实体 MME发送的第 一通知消息, 所述第一通知消息用于指示所述 eNB为电路域回落 CSFB将用户 设备 UE从所述 LTE网络移动到 2G或 3G网络;
所述 eNB向所述 MME发送切换要求消息, 所述切换要求消息用于请求所 述 MME为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS 域;
所述 eNB指示所述 UE从所述 LTE网络重定向到所述 2G或 3G网络, 以便所 述 UE从所述 LTE网络移动到所述 2G或 3G网络。
19、 根据权利要求 18所述的方法, 其特征在于, 所述方法还包括
在所述 eNB向所述 MME发送所述切换要求消息之前, 所述 eNB确定所述 UE不支持从所述 LTE网络到所述 2G或 3G网络的切换;
和 /或, 在所述 eNB指示所述 UE从所述 LTE网络重定向到所述 2G或 3G网络 之前,所述 eNB确定所述 UE不支持从所述 LTE网络到所述 2G或 3G网络的切换。
20、 根据权利要求 18述的方法, 其特征在于, 所述方法还包括:
所述切换要求消息包含第一指示信息, 所述第一指示信息用于请求所述 MME为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域, 或者,所述一指示信息用于请求所述 MME为所述 CSFB将所述 UE从所述 LTE网 络切换到所述 2G或 3G网络的 CS域, 并且指示所述 UE不支持从所述 LTE网络切 换到所述 2G或 3G网络;
或者, 所述切换要求消息中的源到目标容器中包含第二指示信息, 所述第 二指示信息用于请求所述 2G或 3G网络的基站为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域;
或者, 所述切换要求消息中的源到目标容器中包含第二指示信息, 所述第 二指示信息用于请求所述 2G或 3G网络的基站为所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域, 并且指示所述 UE不支持从所述 LTE 网络切换到所述 2G或 3G网络。
21、 一种移动管理实体 MME, 其特征在于, 包括:
接收单元, 用于接收位于长期演进 LTE网络的用户设备 UE发起的请求消 息, 所述请求消息用于请求电路域回落 CSFB;
生成单元, 用于根据所述接收单元接收的所述请求消息, 生成第一通知消 息, 所述第一通知消息用于指示演进基站 eNB为所述 CSFB将所述 UE从所述 LTE网络移动到 2G或 3G网络;
发送单元, 用于向所述 eNB发送所述生成单元生成的所述第一通知消息; 所述接收单元, 还用于接收所述 eNB发送的切换要求消息;
所述生成单元,还用于根据所述接收单元接收的所述切换要求消息, 生成 第一切换请求消息,所述第一切换请求消息用于请求移动交换中心 MSC将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域;
所述发送单元,还用于向所述 MSC发送所述生成单元生成的所述第一切换 请求消息。
22、 根据权利要求 21所述的移动管理实体, 其特征在于,
所述第一切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络。
23、 根据权利要求 21或 22所述的移动管理实体, 其特征在于, 所述切换要求消息用于指示所述 MME为所述 CSFB将所述 UE从所述 LTE 网络切换到所述 2G或 3G网络的 CS域;
或者, 所述切换要求消息用于指示所述 MME为所述 CSFB将所述 UE从所 述 LTE网络切换到所述 2G或 3G网络的 CS域, 并且还用于指示所述 UE不支持从 所述 LTE网络切换到所述 2G或 3G网络。
24、 根据权利要求 21 - 23任一所述的移动管理实体, 其特征在于, 所述第一通知消息还用于指示所述 LTE网络和所述 2G或 3G网络支持为所 述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域。
25、 根据权利要求 24所述的移动管理实体, 其特征在于,
所述 LTE网络和所述 2G或 3G网络支持单一无线语音呼叫连续性 SRVCC 切换。
26、 一种移动交换中心 MSC, 其特征在于, 包括:
接收单元, 用于接收移动管理实体 MME发送的第一切换请求消息, 所述 第一切换请求消息用于请求所述 MSC为电路域回落 CSFB将用户设备 UE从长 期演进 LTE网络切换到 2G或 3G网络的电路交换 CS域;
生成单元, 用于根据所述接收单元接收的所述第一切换请求消息, 生成第 二切换请求消息, 所述第二切换请求消息用于请求所述 2G或 3G网络的基站为 所述 CSFB将所述 UE从所述 LTE网络切换到所述 2G或 3G网络的 CS域, 所述第 二切换请求消息包含所述 UE的标识, 以便所述基站根据所述标识向所述 UE发 送所述基站根据所述第二切换请求消息分配的 CS域无线接入承载 RAB;
发送单元, 用于向所述 2G或 3G网络的基站发送所述生成单元生成的所述 第二切换请求消息;
所述接收单元, 还用于接收所述 2G或 3G网络的基站发送的第二切换请求 确认消息;
所述接收单元,还用于接收所述基站发送的切换完成消息, 所述切换完成 消息用于指示所述 UE已经从所述 LTE网络移动到所述 2G或 3G网络。
27、 根据权利要求 26所述的 MSC, 其特征在于,
所述接收单元, 还用于接收所述 UE发送的第一 CS呼叫连接请求消息; 所述生成单元, 还用于根据所述接收单元接收的所述第一 CS呼叫连接请 求消息为所述 UE生成第一会话。
28、 根据权利要求 26所述的 MSC, 其特征在于,
所述发送单元, 还用于向所述 UE发送第二 CS呼叫连接请求消息, 所述第 二 CS呼叫连接请求消息用于请求所述 UE生成第二会话。
29、 根据权利要求 27所述的方法, 其特征在于,
所述接收单元, 还用于接收所述 UE发送的连接管理业务请求消息, 和 /或 寻呼响应消息;
所述发送单元,还用于在所述接收单元接收到至少一条下列消息之后,发 送第二通知消息给所述基站, 所述第二通知消息用于请求所述基站为所述 UE 分配 CS域资源,
其中, 所述下列消息包括: 所述切换完成消息, 所述连接管理业务请求消 息, 所述第一 CS呼叫连接请求消息, 所述寻呼响应消息。
30、 根据权利要求 28所述的方法, 其特征在于,
所述发送单元, 还用于在发送所述第二 CS呼叫连接请求消息之后, 发送 所述生成单元生成的第二通知消息给所述基站,所述第二通知消息用于请求所 述基站为所述 UE分配 CS域资源。
31、 根据权利要求 26 - 30任一所述的方法, 其特征在于,
所述第二切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络; 或者,
所述第一切换请求消息还用于指示所述 UE不支持从所述 LTE网络切换到 所述 2G或 3G网络。
32、 一种 2G或 3G网络的基站, 其特征在于, 包括:
接收单元,用于接收移动交换中心 MSC发送的第二切换请求消息,所述第 二切换请求消息包含用户设备 UE的第一标识, 所述第二切换请求消息用于请 求所述基站将所述 UE从长期演进 LTE网络切换到所述 2G或 3G网络的电路交换 CS域;
所述接收单元, 还用于接收所述 UE移动到所述 2G或 3G网络后发送的无线 连接请求消息;
处理单元,用于根据所述接收单元接收的所述无线连接请求消息建立与所 述 UE之间的无线连接;
所述处理单元, 还用于从所述 UE获取所述 UE的第二标识, 确定所述第一 标识和第二标识相同;
所述处理单元,还用于根据所述接收单元接收的所述第二切换请求消息为 所述 UE分配 CS域无线接入承载 RAB;
所述处理单元,还用于生成第三通知消息, 所述第三通知消息包含所述处 理单元分配的所述 CS域 RAB;
发送单元, 用于向所述 UE发送所述处理单元生成的所述第三通知消息。
33、 根据权利要求 32所述的基站, 其特征在于,
所述处理单元, 还用于确定所述 UE不支持从 LTE网络到 2G或 3G网络的切 换。
34、 根据权利要求 32或 33所述的基站, 其特征在于,
所述接收单元, 还用于接收所述 UE发送给所述 MSC的信令消息, 其中, 所述处理单元用于从所述无线连接请求消息或所述信令消息提取所述第二标 识;
或者,
所述发送单元, 还用于发送标识请求消息给所述 UE;
所述接收单元, 还用于接收所述 UE发送的标识请求响应消息, 其中, 所 述处理单元用于从所述标识请求响应消息提取所述第二标识。
35、 根据权利要求 32-34任一所述的基站, 其特征在于,
所述接收单元, 还用于接收所述 UE发送的呼叫建立消息或者呼叫确认消 息, 或者, 接收所述 MSC发送的呼叫处理消息;
其中, 所述发送单元是在所述接收单元接收所述 UE发送的呼叫建立消息 或者呼叫确认消息后,或者在所述接收单元接收所述 MSC发送的呼叫处理消息 后, 发送所述第三通知消息给所述 UE的。
36、 根据权利要求 32-35任一所述的基站, 其特征在于,
所述发送单元, 还用于向所述 UE发送通用移动通信系统陆地无线接入网 UTRAN移动性信息, 所述 UTRAN移动性信息不包含位置域标识 LAI, 在预定 的时间后, 向所述 UE发送 LAI。
37、 根据权利要求 32-35任一所述的基站, 其特征在于,
所述发送单元, 还用于向所述 UE发送通用移动通信系统陆地无线接入网 UTRAN移动性信息, 所述 UTRAN移动性信息不包含位置域标识 LAI;
所述接收单元,还用于接收所述 MSC发送的呼叫释放命令或者呼叫连接接 通消息或者所述 UE发送的呼叫连接接通消息;
所述发送单元,还用于在所述接收单元接收所述呼叫释放命令或者所述呼 叫连接接通消息之后向所述 UE发送 LAI。
38、 根据权利要求 32-37任一所述的基站, 其特征在于,
所述接收单元, 还用于接收所述 MSC发送的呼叫释放消息,
所述处理单元 ,还用于根据所述呼叫释放消息将所述 UE重定向到所述 LTE 网络, 或者根据所述呼叫释放消息将所述 UE切换到所述 LTE网络。
39、 根据权利要求 32-38任一所述的基站, 其特征在于,
所述接收单元, 还用于接收所述 UE发送的位置更新请求消息,
所述处理单元, 还用于确定不向所述 MSC发送所述位置更新请求消息, 新请求消息时向所述 UE发送所述位置更新请求消息。
40、 一种演进基站 eNB, 其特征在于, 包括:
接收单元, 用于接收移动管理实体 MME发送的第一通知消息, 所述第一 通知消息用于指示所述 eNB为电路域回落 CSFB将用户设备 UE从长期演进 LTE 网络移动到 2G或 3G网络;
生成单元,用于根据所述接收单元接收的所述第一通知消息生成切换要求 消息,所述切换要求消息用于请求所述 MME为所述 CSFB将所述 UE从所述 LTE 网络切换到所述 2G或 3G网络的 CS域;
发送单元,用于向所述 MME发送所述生成单元生成的所述切换要求消息;
所述发送单元, 还用于向所述 UE发送重定向请求消息, 所述重定向请求 消息指示所述 UE从所述 LTE网络重定向到所述 2G或 3G网络。
41、根据权利要求 40所述的演进基站,其特征在于,所述演进基站还包括: 确定单元,用于在所述发送单元向所述 MME发送所述切换要求消息之前, 确定所述 UE不支持从所述 LTE网络到所述 2G或 3G网络的切换; 和 /或, 用于在 所述发送单元发送所述重定向请求消息之前, 确定所述 UE不支持从所述 LTE 网络到所述 2G或 3G网络的切换。
42、 一种网络切换系统, 其特征在于, 包括: 移动管理实体、 演进基站、 移动交换中心、 基站和用户设备;
所述移动管理实体为上述权利要求 21~25任意一项所述的移动管理实体; 所述移动交换中心为上述权利要求 26~31任意一项所述的移动交换中心; 所述基站为上述权利要求 32~39任意一项所述的基站;
所述演进基站为上述权利要求 40或 41所述的演进基站。
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