CN102308629A - Method of voice falling back and device thereof - Google Patents

Method of voice falling back and device thereof Download PDF

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Publication number
CN102308629A
CN102308629A CN2011800011049A CN201180001104A CN102308629A CN 102308629 A CN102308629 A CN 102308629A CN 2011800011049 A CN2011800011049 A CN 2011800011049A CN 201180001104 A CN201180001104 A CN 201180001104A CN 102308629 A CN102308629 A CN 102308629A
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China
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access network
cell
radio access
network
fallback
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Chinese (zh)
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帅扬来
饶琼
胡春丽
秦亚丽
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery

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

Abstract

The invention discloses a method of voice falling back and a device thereof. If a user device UE in an area of second wireless access network is stored with context information in an area of a first wireless access network, and the user device UE is ensured to fall back to the first wireless access network, the UE reorients to the area of the first wireless access network based on the context information of the area of the first wireless access network. The version of the second wireless access network is higher than the version of the first wireless access network. The invention can reduce time of voice falling back and improve the efficiency of voice falling back.

Description

Voice fallback method and device
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for voice fallback.
Background
With the development of communication technology, in some areas with telephone traffic hot spots, wireless access networks with different versions exist; when a UE (User Equipment) resides in a cell of a high-version radio access network and needs to perform a service that is not supported by the high-version radio access network, the UE needs to perform voice fallback to a cell of a low-version radio access network to perform the service.
For example, a high-release radio access network takes an LTE (Long Term Evolution) network as an example, a low-release radio access network takes a 2G or 3G network as an example, the LTE network only supports PS (Packet Switching) services but not CS (Circuit Switching) services, and when a UE resides in the LTE network and needs to perform CS services, the UE needs to perform voice fallback to a cell of the 2G or 3G network and perform CS services in the 2G or 3G network.
In the existing voice fallback method, the UE registers and resides in a cell of the LTE network, and if the UE detects that it needs to fall back to the 2G network or the 3G network for CS service, the UE requests the network side to fall back to the 2G network or the 3G network, and measures the 2G network or the 3G network cell and reads system information according to the requirement of the network side, and then sends a measurement report of each cell. The network side selects a cell according to the measurement report and then sends an indication to the UE, and then the UE falls back to the cell selected by the network side to carry out CS service. It can be seen that the UE in the prior art needs a long time to complete the voice fallback procedure.
Disclosure of Invention
In order to reduce the time of voice fallback, the invention provides a method and equipment for voice fallback.
One aspect of the present invention provides a method of voice fallback, the method comprising:
if the context information of the cell of the first radio access network is stored in the user equipment UE residing in the cell of the second radio access network and the UE determines that the UE needs to fall back to the first radio access network, the UE redirects to the cell of the first radio access network according to the context information of the cell of the first radio access network; wherein the version of the second radio access network is higher than the version of the first radio access network.
Another aspect of the present invention provides a method of voice fallback, the method comprising:
a second wireless access network device residing in User Equipment (UE) receives a fallback indication and an identifier of the UE, wherein the fallback indication is used for requesting voice to fall back to a cell of a first wireless access network;
the second radio access network equipment determines that the UE is registered in the cell of the first radio access network according to the identity of the UE;
and the second radio access network equipment sends a Circuit Switching (CS) priority fallback indication to the UE, wherein the CS priority fallback indication is used for triggering the UE to fall back to the cell of the first radio access network in a voice mode.
Another aspect of the invention provides an apparatus comprising:
the processor is configured to determine that the device needs to fall back to the first radio access network when the device resides in the cell of the second radio access network, and redirect the device to the cell of the first radio access network according to the context information of the cell of the first radio access network stored in the memory; wherein the version of the second radio access network is higher than the version of the first radio access network.
Another aspect of the invention provides an apparatus comprising:
a receiver, configured to receive a fallback indication and an identifier of a user equipment UE, where the fallback indication is used to request a voice to fall back to a cell of a first radio access network, and the UE resides in a second radio access network controlled by the UE;
a processor, configured to determine, according to the identity of the UE, that the UE is registered in a cell of the first radio access network;
a transmitter, configured to send a circuit switched, CS, priority fallback indication to the UE, where the CS priority fallback indication is used to trigger the UE to fall back to a cell of the first radio access network in a voice mode.
In the technical scheme, the UE resides in the cell of the second radio access network and stores the context information of the cell of the first radio access network, and when the UE determines that the UE needs to fall back to the cell of the first radio access network in the cell of the second radio access network, the UE redirects to the cell of the first radio access network according to the context information of the cell of the first radio access network, so that the UE does not need to measure the cell and read the system information of the cell in the process of falling back to the first radio access network, the time of voice falling back is shortened, and the efficiency of voice falling back is improved.
Drawings
FIG. 1 is a flow diagram of a method for a voice fallback provided by an embodiment of the present invention;
FIG. 2 is a flow chart of a first method for a voice fallback provided by another embodiment of the present invention;
fig. 3 is a flow chart of suspending an ongoing PS service of a UE provided by another embodiment of the present invention;
fig. 4 is a flow diagram of recovering suspended PS traffic provided by another embodiment of the present invention;
FIG. 5 is a flow diagram of a method for a second speech fallback provided by another embodiment of the present invention;
FIG. 6 is a flow diagram of a method for a third speech fallback provided by another embodiment of the present invention;
FIG. 7 is a schematic diagram of a first apparatus provided in accordance with another embodiment of the present invention;
fig. 8 is a schematic diagram of a second apparatus provided by another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
One embodiment of the present invention provides a method for voice fallback, comprising: if the UE residing in the cell of the second radio access network stores the context information of the cell of the first radio access network and determines that the UE needs to fall back to the first radio access network, the UE redirects to the cell of the first radio access network according to the context information of the cell of the first radio access network; wherein the version of the second radio access network is higher than the version of the first radio access network. For example, as shown in fig. 1, in this embodiment, it is first determined whether a UE residing in a cell of a second radio access network stores context information of a cell of a first radio access network, and it is determined whether a fallback to the first radio access network is required (step 101). If so, the cell is redirected to the cell of the first radio access network according to the context information of the cell of the first radio access network (step 102). The two determination operations in step 101 may be performed simultaneously, or may be performed first and then, for example: performing the second determination if the first determination result is yes, and performing step 102 if the second determination result is yes; alternatively, the first determination is performed again when the second determination result is yes, and step 102 is performed again when the first determination result is yes.
Further, the method further comprises:
when the UE registers with a cell of the first radio access network, context information of the cell of the first radio access network is stored.
Optionally, if the UE is a UE with CS priority, the method further includes:
after registering to a cell of a first radio access network, the UE resides in the cell of the first radio access network;
when the UE carries out the PS service, the UE is registered in a cell of a second wireless access network and resides in the cell of the second wireless access network; or,
optionally, if the UE is a non-CS-prioritized UE, the method further includes:
when the UE is registered with the cell of the first radio access network, it is also registered with and camped on the cell of the second radio access network.
Optionally, before the UE determines that it needs to fall back to the first radio access network, the method further includes:
and the UE sends double receiving and single sending capability information to the second wireless access network equipment, wherein the double receiving and single sending capability information is used for indicating that the UE is registered to a cell of the first wireless access network and a cell of the second wireless access network.
Optionally, after the UE determines that it needs to fall back to the first radio access network, the method further includes:
the UE sends a fallback indication and the identity of the UE to the second radio access network equipment, wherein the fallback indication is used for requesting voice to fall back to a cell of the first radio access network;
and the UE receives a CS priority fallback indication sent by the second radio access network equipment, wherein the CS priority fallback indication is used for triggering the UE to preferentially fall back to the cell of the first radio access network.
Optionally, when the UE determines that it needs to fall back to the first radio access network, and the UE is performing a PS service in a cell of the second radio access network, the method further includes:
and the UE requests the second wireless access network equipment to suspend the PS service.
Optionally, the method further includes:
and after the CS service in the cell of the first radio access network is finished, the UE requests the second radio access network equipment to recover the suspended PS service.
In the embodiment of the invention, the UE resides in the cell of the second radio access network and stores the context information of the cell of the first radio access network, and when the UE determines that the UE needs to fall back to the cell of the first radio access network in the cell of the second radio access network, the UE is redirected to the cell of the first radio access network according to the context information of the cell of the first radio access network, so that the UE does not need to measure the cell and read the system information of the cell in the process of falling back to the first radio access network, the time of voice falling back is reduced, and the efficiency of voice falling back is improved.
Another embodiment of the present invention provides a method of voice fallback. When the UE performs the PS service in the LTE network, if the CS service needs to be performed, the UE needs to fall back to the 2G network or the 3G network to perform the CS service; the procedure of dropping the UE from the LTE network to the 2G network may be the same as the procedure of dropping the UE from the LTE network to the 3G network, and in this embodiment, the dropping of the UE to the 2G network is only used as an example for explanation, referring to fig. 2, the method includes:
step 201: after starting up, UE registers to a cell of a 2G network through an initial attachment process and stores context information of the cell of the 2G network;
the context information of the cell comprises the identification of the cell and system information; when the UE performs an initial attachment process, the UE measures a cell of the 2G network and reads a system message of the cell, sends a measurement report to a network side, the network side selects a cell according to the measurement report and informs the UE, the UE is registered in the cell selected by the network side, and meanwhile, the UE also stores an identifier, the system message and the like of the cell selected by the network side.
When the UE performs the initial attach procedure, the UE also completes registration from the UE to an MSC (Mobile Services switching center) and registration from the MSC to an HSS (Home Subscriber Server), so that after the UE completes the initial attach procedure, the MSC stores an identifier, location information, and the like of the UE, and the HSS stores an identifier of the MSC registered by the UE, address information, an identifier, and the like of the UE.
It should be noted that the UE may be divided into a CS-preferred UE and a non-CS-preferred UE, where the CS-preferred UE is a UE biased to initiate a service through a CS domain, and the non-CS-preferred UE is a UE biased to initiate a service through a PS domain. In this embodiment, for a UE with a priority CS, the UE is preferentially registered in a cell of a 2G network through an initial attach procedure and resides in the cell of the 2G network, and the initial attach procedure is not initiated to the LTE network until the UE needs to perform PS service access; for the UE with non-CS priority, the UE is first registered in the cell of the 2G network through the initial attach procedure, and then immediately performs step 202 to register in the cell of the LTE network.
Step 202: the UE scans and selects the LTE network, registers the LTE network in a cell of the LTE network through an initial attachment process and stores context information of the cell of the LTE network;
the UE scans and selects an LTE network, registers to a selected cell of the LTE network by executing an initial attachment process, measures the cell of the LTE network and reads system information of the cell in the process of executing the initial attachment process, sends a measurement report to a network side, selects a cell by the network side according to the measurement report and informs the UE, and registers to the cell selected by the network side, and simultaneously stores the identification, the system information and the like of the cell selected by the network side.
When the UE performs the initial process, the UE further completes registration from the UE to an MME (Mobility Management Entity) and registration from the MME to an HSS, so that after the UE is registered in a cell selected by the network side, the MME stores an identifier, location information, and the like of the UE, and the HSS stores the identifier of the MME registered by the UE, address information, an identifier, and the like of the UE.
Step 203: after registering in a cell of an LTE network and a cell of a 2G network, the UE immediately sends dual-radio/single-radio capability information to an eNB (evolved NodeB);
in this embodiment, the UE is configured to have dual-transceiver capability, that is, the UE may be attached to two access networks and may receive data transmitted from the two access networks simultaneously, but the UE may transmit data only in one access network, so in this embodiment, the UE may be attached to a cell of an LTE network and a cell of a 2G network.
Step 204: the eNB receives the dual-radio-single-radio capability information sent by the UE, and stores the corresponding relation between the identity of the UE and the cell of the 2G network to which the UE is registered;
further, the UE may also store a correspondence between the identity of the UE and the cell to which the UE has registered with the LTE network.
For example, when the UE performs a procedure of initially attaching to a cell of the LTE network, the UE establishes a connection with an eNB in which the cell of the LTE network is located, and the eNB may acquire an identifier of the UE; after the UE is registered to the LTE network and the 2G network and before the UE releases the connection with the eNB, the UE can send double-receiving single-sending capability information to the eNB through the connection with the eNB; after receiving the dual-transceiver capability information sent by the UE, the eBN determines the identity of the UE according to the connection of receiving the dual-transceiver capability information sent by the UE, and stores the corresponding relation between the identity of the UE and the received dual-transceiver capability information.
For another example, if the UE registers in the LTE network and the 2G network and releases the connection with the eNB, the UE sends the dual-receive single-transmit capability information to the eNB, and at this time, the UE also needs to send the identifier of the UE itself to the eNB; and the eNB receives the dual-receiving single-sending capability information and the identification of the UE and stores the corresponding relation between the identification of the UE and the dual-receiving single-sending capability information.
For the non-CS-priority UE, when the UE is registered in the cell of the LTE network, the UE resides in the cell of the LTE network, and if the non-CS-priority UE needs to perform the PS service, the non-CS-priority UE can directly perform the PS service in the resident cell of the LTE network.
The UE with the priority CS resides in a cell of the 2G network when being registered in the cell of the 2G network, and the UE is registered in the cell of the LTE network through an initial attachment process and performs PS service in the cell of the LTE network only when needing to perform PS service.
Further, in this embodiment, for a UE with non-CS preference, after being powered on, the UE may first register in a cell of the LTE network through an initial attach procedure, then select the 2G network and register in the cell of the 2G network through the initial attach procedure, and after completing registering in the cell of the 2G network, the UE re-accesses the cell of the registered LTE network and resides in the cell of the LTE network.
The UE resides in a cell of an LTE network, and if the UE needs to perform PS service, the UE performs the PS service through connection with a network side.
Wherein, the UE camping in the LTE network may cause the UE to fall back to a cell of the 2G network for CS services due to one or more of the following reasons, including:
(1) and when the UE is switched to the location area, the UE needs to fall back to the cell of the 2G network from the cell of the LTE network, and the location area is updated in the cell of the 2G network.
Further, after the UE completes the location area update, the UE updates the stored context information of the cell of the 2G network to the context information of the cell where the UE is located after the location area update.
(2) And the registration period of the 2G network of the UE is expired, and at the moment, the UE needs to fall back to the cell of the 2G network from the cell of the LTE network and register again in the cell of the 2G network.
When the UE resides in a cell of the LTE network, and the UE starts the registration period of the 2G network in the UE itself, and the UE needs to request to fall back to the cell of the 2G network to restart registration each time the registration period of the 2G network expires.
(3) The UE actively calls other users through the CS domain, and at the moment, the UE needs to fall back to the cell of the 2G network from the cell of the LTE network and initiates a calling process in the cell of the 2G network through the CS domain;
(4) and the UE as a called party and a calling party carry out voice conversation through the CS domain, and at the moment, the UE needs to fall back to the cell of the 2G network from the cell of the LTE network and carry out voice conversation with the calling party through the CS domain in the cell of the 2G network.
When a calling party needs to perform voice conversation with UE through a CS domain, the UE is paged first, and after the UE receives paging, the calling party is detected to perform voice conversation with the UE; when the calling party pages the UE, the paging is firstly sent to the MSC to which the UE belongs, because the MSC stores the identifier and the position information of the UE, when the MSC receives the paging sent to the UE by the calling party, the MSC can acquire the position information of the UE from the identifier and the position information of the stored UE according to the identifier of the UE carried in the paging, and directly sends the paging to the UE according to the position information of the UE, and the paging does not need to be sent to the MME first and then sent to the UE by the MME.
Step 205: when the UE detects that the UE needs to fall back to a cell of a 2G network in a cell of the LTE network, the UE sends an extended service request message to an MME, and the extended service request message at least carries a CS fall back indication and an identifier of the UE;
wherein the CS fallback indication is for requesting voice fallback into a cell of the 2G network.
Step 206: MME receives an extended service request message carrying a CS fallback indication and a UE identifier, and sends a UE context modification request message to eNB, wherein the UE context modification request message carries the CS fallback indication and the UE identifier;
specifically, the MME receives an extended service request message sent by the UE, determines that the UE needs to perform voice fallback according to a CS fallback indication carried in the extended service request message and an identifier of the UE, and sends a UE context modification request message carrying the CS fallback indication and the identifier of the UE to the eNB.
Step 207: the eNB receives the UE context modification request message and returns a UE context modification response message to the MME;
step 208: the eBN determines that the UE needs to perform voice fallback according to the CS fallback indication carried by the UE context modification request message and the UE identification, and executes step 209;
step 209: the eNB determines whether the UE is attached to the cell of the 2G network or not according to the stored corresponding relation between the UE identifier and the cell in which the UE is registered to the 2G network and the UE identifier;
specifically, the eNB searches for a correspondence between the UE identifier and a cell in which the UE has registered in the 2G network according to the UE identifier, and determines that the UE has attached to the cell in the 2G network if the corresponding cell in the 2G network is found.
Step 210: if the eNB determines that the UE is attached to a cell of a 2G network, the eNB sends an RRC connection release message carrying a CS priority fallback indication, wherein the CS priority fallback indication is used for triggering the UE to preferentially perform voice fallback;
step 211: the UE receives the RRC connection release message, and executes step 212 according to the trigger of the CS fallback priority indication carried in the RRC connection release message;
further, if the UE detects that the UE needs to fall back to the 2G network when performing the PS service through the connection with the network side in the LTE network, the UE also releases the connection with the network side after receiving the RRC connection release message.
Step 212: the UE redirects to the registered cell of the 2G network according to the stored context information of the cell of the 2G network, and carries out corresponding CS service in the cell of the 2G network;
in this embodiment, since the UE is registered in the cell of the 2G network after being powered on and stores the context information of the cell of the 2G network, including the identifier of the cell and the system message, after receiving the RRC connection release message, the UE is redirected to the registered cell of the 2G network directly according to the stored identifier of the cell and the system message, without measuring the cell and reading the system message of the cell, thereby reducing the time for the UE to perform the voice fallback and improving the efficiency of the voice fallback.
After the UE is redirected to the cell of the 2G network, the UE establishes a connection with the network side in the cell of the 2G network, and performs a CS service through the connection, including:
(1) if the UE needs to update the location area in the 2G network, the UE initiates a location updating process in the registered cell of the 2G network;
(2) if the UE needs to perform periodic registration in the 2G network, the UE initiates a re-registration process in a cell of the registered 2G network;
(3): if the UE needs to pass through the CS domain, the UE is used as a calling party to initiate a calling process in a cell of the registered 2G network through the CS domain;
(4): if the UE needs to perform the voice session with the calling party through the CS domain, the UE is used as a called party to start the process of performing the voice session through the CS domain in the cell of the registered 2G network.
Further, if the UE detects that the UE needs to fall back to the 2G network when performing the PS service through the connection with the network side in the LTE network, the UE may further perform step 213.
Step 213: the UE sends a PS service suspension request message to an SGSN (Serving GPRS (General Packet radio service) Support Node, and the PS service suspension request message carries an identifier of the UE; this step is an optional step.
Step 214: SGSN receives the PS service suspension request message, and according to the identifier of UE carried by the PS service suspension request message, MME suspends the ongoing PS service of UE, and triggers HSS to set the state of MME as a suspension state; this step is an optional step.
Referring to fig. 3, the SGSN may suspend the ongoing PS service of the UE by the MME according to the following procedures (a) - (E), and trigger the HSS to set the state of the MME to the suspension state, including:
(A) the method comprises the following steps After receiving the PS service suspension request message, the SGSN sends a suspension trigger command message to the MME, and the suspension trigger command message carries the identifier of the UE;
(B) the method comprises the following steps The MME receives the suspension trigger command message and suspends the ongoing PS service of the UE according to the identity of the UE carried by the suspension trigger command message;
when the UE performs the PS service, the MME stores the UE identifier and the PS service corresponding to the UE identifier, so that the MME can obtain the ongoing PS service of the UE according to the UE identifier.
(C) The method comprises the following steps The MME sends a state setting request message to the HSS, wherein the state setting request message at least carries a suspension indication, a UE identifier and an MME identifier;
(D) the method comprises the following steps The HSS receives the request message for setting the state, sets the state of the MME as the suspension state according to the suspension indication carried by the request message for setting the state, and stores the corresponding relation between the identity of the UE, the identity of the MME and the set suspension state;
(E) the method comprises the following steps And the HSS returns a setting state request response message to the MME.
Among them, it should be noted that: if the UE falls back to the 3G network from the LTE network, the eNB sends a PS service suspension request message carrying the identity of the UE to the MME when sending an RRC connection release message to the UE, the MME receives the PS service suspension request message, suspends the ongoing PS service of the UE according to the identity of the UE carried by the PS service suspension request message, and sends a state setting request message to the HSS; in addition, after receiving the RRC connection release message sent by the eNB, the UE is directly redirected to the registered cell of the 3G network without sending a PS service suspension request message.
When an SMS-GMSC (Short Message Service Gateway MSC) receives a Short Message sent to UE by other users through a PS domain, the SMS-GMSC sends an inquiry request Message carrying an identification of the UE to an HSS, the inquiry request Message is used for requesting an MME address to which the UE belongs from the HSS, when the HSS receives the inquiry request Message, the state of the MME to which the UE belongs is detected to be a hanging state according to the corresponding relation between the identification of the UE carried by the inquiry request Message and the self-stored identification of the UE, the identification of the MME and the hanging state, and the HSS does not return the address of the MME to which the UE belongs to the SMS-GMSC, so that the SMS-GMSC cannot send the Short Message to the UE, and the UE is not affected by the CS Service.
If the UE completes the corresponding CS service procedure in the attached cell of the 2G network and the MME suspends the PS service of the UE, the UE may re-access the cell of the LTE network and continue to perform the suspended PS service, that is, the UE may perform the following step 215.
Step 215: when the CS service is finished, the UE re-accesses the cell of the LTE network according to the stored context information of the LTE network and sends an NAS (Non Access Stratum) message carrying the self identification to the MME; this step is an optional step.
Step 216: after receiving the NAS message, the MME recovers the suspended PS service according to the identity of the UE carried by the NAS message and enables the HSS to cancel the suspended state set for the MME; this step is an optional step.
Referring to fig. 4, the step of the MME notifying the HSS to cancel the suspension state set for the MME may be divided into the following steps (a) to (c), including:
(a) the method comprises the following steps The MME receives an NAS message sent by the UE, and recovers the suspended PS service according to the UE identifier carried by the NAS message;
and the MME acquires the corresponding PS service according to the identity of the UE carried by the NAS message and recovers the acquired PS service.
(b) The method comprises the following steps The MME sends a state canceling request message to the HSS, and the state canceling request message carries a recovery indication, a UE identifier and an MME identifier;
(c) the method comprises the following steps The HSS receives the request message for canceling the state, deletes the corresponding relation between the identity of the UE, the identity of the MME and the suspension state, and sends a response message for canceling the state to the MME;
(d) the method comprises the following steps And the HSS sends a cancellation state response message to the MME.
Step 217: and the UE continues to carry out the recovered PS service in the accessed cell of the LTE network. This step is an optional step.
The method provided in this embodiment is also applicable to the UE dropping from the cell of the 3G network to the cell of the 2G network, and the specific dropping process is not described in detail.
In the embodiment of the invention, the UE is registered in both the LTE network cell and the 2G network cell, and stores the context information of the LTE network cell and the context information of the 2G network cell, when the UE detects that the UE needs to fall back to the 2G network for CS service in the LTE network cell, the UE is directly redirected to the registered 2G network cell according to the context information of the 2G network cell, so that the 2G network cell does not need to be measured and the system message of the 2G network cell is read in the process of falling back to the 2G network, the voice falling time is reduced, and the voice falling efficiency is improved; in addition, because the UE is registered in the 2G network, the MSC stores the identifier and location information of the UE, so when the MSC receives a call from another user to the UE, the MSC can directly send the call to the UE according to the stored identifier and location information of the UE, and the call does not need to be sent to the MME first and then to the UE by the MME, so that there is no need to have an interface connection between the MME and the MSC, thereby reducing the operation cost.
Another embodiment of the present invention provides a method of voice fallback. When the UE performs the PS service in the LTE network, if the CS service needs to be performed, the UE needs to fall back to the 2G network or the 3G network to perform the CS service; the procedure of dropping the UE from the LTE network to the 2G network is substantially the same as the procedure of dropping the UE from the LTE network to the 3G network, and in this embodiment, taking the UE dropping to the 2G network as an example, referring to fig. 5, the method includes:
step 301-304: are respectively the same as the steps 201-204 of the embodiment 2, and are not described in detail herein;
step 305: if the UE detects that the UE needs to fall back to the 2G network because the UE is switched in a position area or the registration period of the 2G network is out of date in a cell of the LTE network, an extended service request message is sent to the MME, and the extended service request message carries a session maintenance instruction and the identity of the UE;
when the UE is switched to the location area, the UE needs to be switched to other cells through a location updating process to maintain a session with the 2G network; when the registration period of the 2G network of the UE expires, the session with the 2G network needs to be maintained through the re-registration procedure, and the time required by the location update procedure and the re-registration procedure is short, so that the UE notifies the network side through the session maintenance indication that the network side falls back to the 2G network this time in order to maintain the session with the 2G network, which takes a short time and does not need to switch the ongoing PS service.
Step 306: MME receives the request message of the extended service, and sends a request message of UE context modification to eNB, and the request message of UE context modification carries the session maintenance indication and the UE identification carried by the request message of the extended service;
after receiving the extended service request message, the MME determines that the UE needs to fall back to the 2G network due to maintaining the session with the 2G network according to the session maintenance indication and the UE identification carried by the extended service request message, and then sends the context modification request message of the UE to the eNB.
Step 307: the eNB receives the UE context modification request message and returns a UE context modification response message to the MME;
step 308: the eNB determines that the UE needs to perform session maintenance and perform voice fallback according to the session maintenance indication carried by the UE context modification request message and the UE identifier, and executes step 309;
step 309: the eNB determines whether the UE is attached to the cell of the 2G network or not according to the stored identification, the corresponding relation of the cell in which the UE is registered to the 2G network and the identification of the UE;
specifically, the eNB searches for a correspondence between the UE identifier and a cell in which the UE has registered in the 2G network according to the UE identifier, and determines that the UE has dual-radio/single-radio capability if the corresponding cell in the 2G network is found, and determines that the UE has attached to the cell in the 2G network.
Step 310: if the eNB determines that the UE is attached to a cell of a 2G network, the eNB sends an RRC connection release message carrying a CS priority fallback indication, wherein the CS priority fallback indication is used for triggering the UE to preferentially perform voice fallback;
step 311-317: are respectively the same as step 211-217 of embodiment 2, and will not be described in detail here.
The method provided in this embodiment is also applicable to the UE dropping from the cell of the 3G network to the cell of the 2G network, and the specific dropping process is not described in detail.
In the embodiment of the invention, the UE is registered in both the LTE network cell and the 2G network cell, when the UE detects that the UE needs to fall back to the 2G network for session maintenance in the process of carrying out PS service in the LTE network cell, the UE directly redirects to the attached 2G network cell after receiving an RRC connection release message sent by the eNB, and the UE does not need to measure the 2G network cell and read the system message of the 2G network cell in the process of falling back to the 2G network, thereby reducing the time of voice falling back and improving the efficiency of voice falling back; in addition, because the UE is already attached to the 2G network, the MSC stores the identifier and location information of the UE, so when the MSC receives a call from another user to the UE, the MSC can directly send the call to the UE according to the stored identifier and location information of the UE, and the call does not need to be sent to the MME first and then to the UE by the MME, so that there is no need to have an interface connection between the MME and the MSC, thereby reducing the operation cost.
As shown in fig. 6, another embodiment of the present invention provides a method of voice fallback, including:
step 401: a second wireless access network device where the UE resides receives a fallback indication and an identifier of the UE, wherein the fallback indication is used for requesting voice to fallback to a cell of a first wireless access network;
step 402: the second radio access network equipment determines that the UE is registered in the cell of the first radio access network according to the stored corresponding relation between the identity of the UE and the dual-radio-receiving-and-transmitting capability information and the identity of the UE;
step 403: and the second radio access network equipment sends a CS priority fallback indication to the UE, wherein the CS priority fallback indication is used for triggering the UE to fall back to the cell of the first radio access network in a voice mode.
Optionally, the method further includes:
the second radio access network equipment stores the corresponding relation between the identity of the UE and the cell of the first radio access network to which the UE is registered; and/or the presence of a gas in the gas,
the second radio access network device stores the correspondence between the identity of the UE and the cell of the second radio access network to which the UE has registered.
Optionally, the method further includes:
and the second wireless access network equipment receives dual-receiving single-transmitting capability information sent by the UE, wherein the dual-receiving single-transmitting capability information is used for indicating that the UE is registered to the cell of the first wireless access network and/or the cell of the second wireless access network.
Optionally, the method further includes:
and the second wireless access network equipment suspends the ongoing Packet Switched (PS) service of the UE.
Optionally, the method further includes:
and recovering the suspended PS service when the UE requests to recover the suspended PS service.
In the embodiment of the invention, the network side determines that the UE is registered in the cell of the first wireless access network and then sends the CS priority fallback indication to the UE to trigger the UE to preferentially fall back to the cell of the first wireless access network, and the network side does not require the UE to measure the cell and read the system information of the cell, so that the UE does not need to measure the cell and read the system information of the cell in the process of falling back to the first wireless access network, the time of voice fallback is shortened, and the efficiency of voice fallback is improved.
As shown in fig. 7, another embodiment of the present invention provides an apparatus comprising: a processor 501 and a memory 502;
the processor 501 is configured to determine that the device needs to fall back to the first radio access network when the device resides in the cell of the second radio access network, and redirect the device to the cell of the first radio access network according to the context information of the cell of the first radio access network stored in the memory 502; wherein the version of the second radio access network is higher than the version of the first radio access network.
Further, the processor 401 is configured to store context information of a cell of the first radio access network in the memory 502 when the device is registered with the cell of the first radio access network.
Further, the apparatus also includes a transceiver;
the transceiver is used for sending the dual-receiving single-sending capability information to the second wireless access network equipment; and/or, the CS priority fallback notification device is configured to send a fallback indication and an identifier of the device to the second radio access network device, and receive a CS priority fallback indication sent by the second radio access network device;
wherein the dual receive-single transmit capability information is used to indicate that the device is registered to a cell of a first radio access network and a cell of a second radio access network; the fallback indication is for requesting a voice fallback into a cell of a first radio access network; the CS priority fallback indication is used to trigger the device to prioritize voice fallback into a cell of the first radio access network.
Wherein the transceiver is further configured to request suspension of ongoing PS traffic from the second radio access network device when the processor 501 determines that the device needs to fall back to the first radio access network.
The transceiver is further configured to request, by the device, the second radio access network device to recover the suspended PS service after the CS service in the cell of the first radio access network is completed.
The device provided by the embodiment may be a user equipment UE. In addition, the device may also be configured to implement actions performed by the UE in the method provided in the foregoing embodiment, which is not described herein again.
In the embodiment of the invention, the UE resides in the cell of the second radio access network and stores the context information of the cell of the first radio access network, and when the UE determines that the UE needs to fall back to the cell of the first radio access network in the cell of the second radio access network, the UE is redirected to the cell of the first radio access network according to the context information of the cell of the first radio access network, so that the UE does not need to measure the cell and read the system information of the cell in the process of falling back to the first radio access network, the time of voice falling back is reduced, and the efficiency of voice falling back is improved.
As shown in fig. 8, another apparatus of the present invention comprises:
a receiver 601, configured to receive a fallback indication and an identifier of the UE sent by the UE, where the fallback indication is used to request a voice fallback to a cell of a first radio access network, and the UE resides in a second radio access network controlled by the device;
a processor 602 configured to determine that the UE is registered in a cell of a first radio access network according to the identity of the UE;
a transmitter 603, configured to send a CS-first fallback indication to the UE, where the CS-first fallback indication is used to trigger the UE to fall back to a cell of the first radio access network in a voice mode.
Further, the apparatus also includes a memory;
a memory for storing a correspondence between the identity of the UE and a cell of the first radio access network to which the UE has registered, and/or a correspondence between the identity of the UE and a cell of the second radio access network to which the UE has registered.
Further, the processor 602 is also configured to suspend ongoing PS traffic of the UE and/or recover suspended PS traffic of the UE.
The device provided in this embodiment may be a network side device, such as an eNB. In addition, the device may also be configured to implement actions performed by the eNB in the method provided in the foregoing embodiment, which is not described herein again.
In the embodiment of the invention, the network side determines that the UE is registered in the cell of the first wireless access network and then sends the CS priority fallback indication to the UE to trigger the UE to preferentially fall back to the cell of the first wireless access network, and the network side does not require the UE to measure the cell and read the system information of the cell, so that the UE does not need to measure the cell and read the system information of the cell in the process of falling back to the first wireless access network, the time of voice fallback is shortened, and the efficiency of voice fallback is improved.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit of the present invention are intended to be included therein.

Claims (20)

1. A method of voice fallback, the method comprising:
if the context information of the cell of the first radio access network is stored in the user equipment UE residing in the cell of the second radio access network and the UE determines that the UE needs to fall back to the first radio access network, the UE redirects to the cell of the first radio access network according to the context information of the cell of the first radio access network; wherein the version of the second radio access network is higher than the version of the first radio access network.
2. The method of claim 1, wherein the method further comprises:
storing context information of a cell of the first radio access network when the UE registers with the cell of the first radio access network.
3. The method of claim 2,
if the UE is a UE with circuit switched CS priority, the method further comprises:
after registering to the cell of the first radio access network, the UE resides in the cell of the first radio access network;
when the UE carries out PS service of packet switching, the UE is registered in a cell of a second wireless access network and resides in the cell of the second wireless access network; or,
if the UE is a UE with non-CS priority, the method further comprises the following steps:
when registering with the cell of the first radio access network, the UE also registers with the cell of the second radio access network and camps on the cell of the second radio access network.
4. The method of any of claims 1-3, wherein the UE determines that a fallback to the first radio access network is needed, the method further comprising:
and the UE sends dual-receiving single-sending capability information to second wireless access network equipment, wherein the dual-receiving single-sending capability information is used for indicating that the UE is registered to a cell of the first wireless access network and a cell of the second wireless access network.
5. The method of any one of claims 1-4, wherein after the UE determines that a fallback to a first radio access network is needed, the method further comprises:
the UE sends a fallback indication and the identity of the UE to second radio access network equipment, wherein the fallback indication is used for requesting voice to fall back to a cell of the first radio access network;
and when the UE receives a CS priority fallback indication sent by the second radio access network equipment, the CS priority fallback indication is used for triggering the UE to preferentially fall back to the cell of the first radio access network in a voice mode.
6. The method of any of claims 1-5, wherein after the UE determines that a fallback to a first radio access network is needed, the UE is engaged in PS traffic in a cell of the second radio access network, and the UE is redirected to the cell of the first radio access network, the method further comprises:
and the UE requests the second wireless access network equipment to suspend the PS service.
7. The method of claim 6, wherein the method further comprises:
and the UE requests the network side to recover the suspended PS service after the CS service in the cell of the first radio access network is completed.
8. A method of voice fallback, the method comprising:
a second wireless access network device residing in User Equipment (UE) receives a fallback indication and an identifier of the UE, wherein the fallback indication is used for requesting voice to fall back to a cell of a first wireless access network;
the second radio access network equipment determines that the UE is registered in the cell of the first radio access network according to the identity of the UE;
and the second radio access network equipment sends a Circuit Switching (CS) priority fallback indication to the UE, wherein the CS priority fallback indication is used for triggering the UE to fall back to the cell of the first radio access network in a voice mode.
9. The method of claim 8, further comprising:
the second radio access network equipment stores the corresponding relation between the identity of the UE and the cell of the first radio access network to which the UE is registered; and/or the presence of a gas in the gas,
the second radio access network device stores a correspondence between the identity of the UE and a cell of the second radio access network to which the UE has registered.
10. The method of claim 9, further comprising:
and the second wireless access network equipment receives dual-receiving single-sending capability information sent by the UE, wherein the dual-receiving single-sending capability information is used for indicating that the UE is registered to the cell of the first wireless access network and/or the cell of the second wireless access network.
11. The method of claim 8, 9 or 10, further comprising:
and the second radio access network equipment suspends the ongoing Packet Switched (PS) service of the UE.
12. The method of claim 11, further comprising:
and recovering the suspended PS service when the UE requests to recover the suspended PS service.
13. An apparatus, comprising a processor and a memory;
the processor is configured to determine that the device needs to fall back to the first radio access network when the device resides in the cell of the second radio access network, and redirect the device to the cell of the first radio access network according to the context information of the cell of the first radio access network stored in the memory; wherein the version of the second radio access network is higher than the version of the first radio access network.
14. The apparatus of claim 13,
the processor is further configured to store context information of a cell of the first radio access network in the memory when the device registers with the cell of the first radio access network.
15. The apparatus of claim 13 or 14, wherein the apparatus further comprises a transceiver;
the transceiver is used for sending dual-transceiver capability information to the second radio access network equipment; and/or, the CS priority fallback notification device is configured to send a fallback indication and an identifier of the device to the second radio access network device, and receive a CS priority fallback indication sent by the second radio access network device;
wherein the dual receive-single transmit capability information is used to indicate that the device is registered with a cell of the first radio access network and a cell of a second radio access network; the fallback indication is for requesting voice fallback into a cell of the first radio access network; the CS priority fallback indication is used to trigger the device priority voice fallback into a cell of the first radio access network.
16. The device of any of claims 13-15, wherein the transceiver is further configured to request suspension of ongoing PS traffic from the second radio access network device when the processor determines that the device needs to fall back to a first radio access network.
17. The device of claim 16, wherein the transceiver is further for the device to request recovery of the suspended PS traffic from the second radio access network device after CS traffic in the cell of the first radio access network is completed.
18. An apparatus, characterized in that the apparatus comprises:
a receiver, configured to receive a fallback indication and an identifier of a user equipment UE, where the fallback indication is used to request a voice to fall back to a cell of a first radio access network, and the UE resides in a second radio access network controlled by the UE;
a processor, configured to determine, according to the identity of the UE, that the UE is registered in a cell of the first radio access network;
a transmitter, configured to send a circuit switched, CS, priority fallback indication to the UE, where the CS priority fallback indication is used to trigger the UE to fall back to a cell of the first radio access network in a voice mode.
19. The apparatus of claim 18, wherein the apparatus further comprises a memory;
the memory is configured to store a correspondence between an identifier of the UE and a cell of the first radio access network to which the UE has registered, and/or a correspondence between an identifier of the UE and a cell of the second radio access network to which the UE has registered.
20. The apparatus of claim 18 or 19,
the processor is further configured to suspend ongoing PS traffic of the UE and/or recover suspended PS traffic of the UE.
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Inventor after: Shuai Yanglai

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Application publication date: 20120104