WO2014198070A1

WO2014198070A1 - Method and device for realizing csfb

Info

Publication number: WO2014198070A1
Application number: PCT/CN2013/077279
Authority: WO
Inventors: 梁健; 查双六; 舒文杰; 舒文江
Original assignee: 华为技术有限公司
Priority date: 2013-06-14
Filing date: 2013-06-14
Publication date: 2014-12-18
Also published as: CN103858484A; CN103858484B

Abstract

A method and device for realizing CSFB are disclosed. The method of the present invention includes: a network device in a first network receives an access request carrying CSFB indication information and transmitted from a terminal , the CSFB indication information is used for indicating that the terminal is a CSFB terminal falling back to the first network for accessing from a second network in which the terminal resides; if the network device recognizes that the terminal is a CSFB terminal based on the CSFB indication information, then the network device allocates radio resource to the terminal according to a resource configuration strategy preset for the CFSB terminal; the network device transmits signaling with the terminal on the allocated radio resource.

Description

CSFB implementation method and device

The present invention relates to the field of wireless communication technologies, and in particular, to a CSFB implementation method and apparatus. Background technique

The LTE (Long Term Evolution) network is a full packet switched network, but voice services will remain an indispensable and important service for a long time. In order to ensure the smooth implementation of high-profile voice services on the LTE network, various standards organizations have actively researched and proposed a variety of voice service solutions.

CSFB (Circuit Switched Fall Back) is one of the results of research projects in 3GPP R8. The background of this research topic is that the wireless modules of LTE and CS (Circuit Switch Domain) dual-mode terminals are single wireless modes, ie, LTE and UTRAN (UMTS Terrestrial Radio Access Network, UMTS Terrestrial Radio Access Network; UMTS) : Universal Mobile Telecommunications System, /GERAN (GSM/EDGE Radio Access Network, GSM/EDGE Radio Access Network; GSM: Global System of Mobile communication, meaning Global System for Mobile Communications; EDGE: Enhanced Data Rate for GSM Evolution, which means an enhanced data rate GSM evolution technology) dual-mode or multi-mode terminal with access capability, cannot receive/transmit circuit domain service signals when using LTE access. In order to enable the terminal to initiate a CS service such as a voice service and receive a paging of a CS service such as voice under the LTE access, and can perform a PS (Packet Switched Domain) service that the terminal is performing in the LTE network. Properly processed, CSFB technology is produced.

In the initial stage of building an LTE network, if the operator already has a mature UTRAN/GERAN network, in order to protect the CS investment, combined with the deployment strategy of the LTE network, the operator can use the original CS domain voice solution to provide voice services. The LTE network only processes data services (including IMS data services; IMS: IP Multimedia Subsystem, meaning IP Multimedia Subsystem). In this case, the CSFB technology is used, that is, when the UE under the LTE coverage processes the voice service, the terminal first falls back to the CS domain and processes the voice service in the CS domain, thus achieving the reuse of the existing CS domain device. Users in LTE networks provide traditional voice services.

As shown in FIG. 1 , in the current CSFB scheme, when the UE (User Equipment) is in an idle state or performs PS data transmission, it works in the LTE network; when the UE initiates a voice call as a calling party or receives the call as a called party When the call is requested, it is dropped back to the 2G network or the 3G network through the handover or reselection process. Among them, the 2G network is represented by GSM, and the 3G network is represented by UMTS.

When the UE falls back from the LTE network to the 2G/3G network, the network device of the 2G/3G network first allocates resources for transmitting signaling to the UE, and allocates resources on the allocated resources. After completing the signaling transmission, it is the UE Assign service transmission resources to carry voice service data.

At present, in the process of the UE falling back from the LTE to the 2G/3G network, the signaling transmission delay is large, which affects the user experience. SUMMARY OF THE INVENTION Embodiments of the present invention provide a method and a device for implementing CSFB, which are used to specifically assign a wireless resource to a CSFB terminal.

In a first aspect, a circuit domain fallback CSFB implementation method is provided, where the method includes:

The network device in the first network receives the access request sent by the terminal, where the access request carries the CSFB indication information, where the CSFB indication information is used to indicate that the terminal falls back from the second network that resides to the first a CSFB terminal that is accessed by a network;

If the network device identifies that the terminal is a CSFB terminal according to the CSFB indication information, assigning a radio resource to the terminal according to a resource configuration policy set in advance for the CSFB terminal;

The network device performs signaling transmission with the terminal on the assigned radio resource.

With reference to the first aspect, in a first possible implementation, the first network is a global mobile communication system GSM network, and the resource configuration policy includes: assigning a service channel TCH to the CSFB terminal, where the TCH is used. For signaling transmission; or,

The first network is a universal mobile communication system UMTS network, and the resource configuration policy includes: a first policy and/or a second policy, where the first policy is that a call initiated at the CSFB terminal is in a radio resource control An RRC establishment phase, wherein the CSFB terminal is assigned a specific signaling radio bearer SRB rate for signaling transmission; the second policy is that the call initiated by the CSFB terminal is in a radio access bearer RAB establishment phase, The CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, when the first network is the GSM network, the access request is a channel request message;

The resource configuration policy set in advance for the CSFB terminal, the assigning the radio resource to the terminal includes: the base station controller BSC assigning a TCH to the terminal according to the resource configuration policy;

The BSC sends the assigned TCH to the terminal and a base station serving the terminal, and instructs the terminal and the base station to use the assigned TCH for signaling transmission.

With the second possible implementation of the first aspect, in a third possible implementation manner, after the network device performs signaling transmission with the terminal on the allocated radio resource, the method further includes:

The BSC instructs the terminal to adjust the assigned TCH to a voice service transmission mode.

With reference to the first, second or third possible implementation of the first aspect, in a fourth possible implementation, the CSFB indication information includes a CSFB identifier and a call type, and the call type includes a calling Or called. With reference to the first possible implementation manner of the first aspect, in a fifth possible implementation manner, when the first network is the UMTS network, the access request is an RRC connection request message;

The resource configuration policy that is set in advance for the CSFB terminal, and the assigning the radio resource to the terminal includes: if the resource configuration policy includes the first policy, the call initiated by the terminal is in the During the RRC setup phase, the radio network controller RNC assigns the specific SRB rate to the terminal according to the second policy; the RNC sends the specific SRB rate to the radio link setup request message to The base station served by the terminal sends the specific SRB to the terminal by using an RRC connection setup message; or

If the resource configuration policy includes the second policy, when the call initiated by the terminal is in the RAB establishment phase, the RNC allocates an air interface asynchronous transmission to the terminal according to the second policy. a mode: the RNC indicates, by using a radio bearer RB setup message, that the terminal and the base station serving the terminal use the air interface asynchronous mode for signaling transmission; or

If the resource configuration policy includes the first policy and the second policy, the call initiated by the CSFB terminal is in an RRC establishment phase, and the RNC is configured to be the terminal assignment according to the first policy. Deriving the specific SRB rate, sending the specific SRB rate to the base station serving the terminal by using the radio link setup request message, and sending the specific SRB to the terminal by using the RRC connection setup message When the call initiated by the terminal is in the RAB establishment phase, the RNC assigns the air interface asynchronous transmission mode to the terminal according to the second policy, and indicates, by using the RB establishment message The terminal and the base station serving the terminal perform signaling transmission by using the air interface asynchronous transmission mode.

In a second aspect, a circuit domain fallback CSFB implementation method is provided, where the method includes:

The terminal sends an access request to the network device in the first network, where the access request carries CSFB indication information, where the CSFB indication information is used to indicate that the terminal falls back from the second network that resides to the first a CSFB terminal that the network accesses;

Receiving, by the terminal, the radio resource that is allocated by the network device, where the radio resource is that the network device identifies, according to the CSFB indication information carried in the access request, that the terminal is a CSFB terminal, Said

The resource configuration policy set by the CSFB terminal is assigned to the terminal;

The terminal performs signaling transmission with the network device on the assigned radio resource.

With reference to the second aspect, in a first possible implementation, the first network is a global mobile communication system GSM network, and the resource configuration policy includes: assigning a service channel TCH to the CSFB terminal, where the TCH is used. For signaling transmission; or,

The first network is a universal mobile communication system UMTS network, and the resource configuration policy includes: a first policy and/or a second policy, where the first policy is that a call initiated at the CSFB terminal is in a radio resource control An RRC establishment phase, wherein the CSFB terminal is assigned a specific signaling radio bearer SRB rate for signaling transmission; the second policy is that the call initiated by the CSFB terminal is in a radio access bearer RAB establishment phase, The CSFB terminal The assigned air interface asynchronous transmission mode is used for signaling transmission.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, when the first network is the GSM network, the access request is a channel request message; The method includes: the TCH that the BSC assigns to the terminal according to the resource configuration policy, where the assigned TCH is used for signaling transmission.

With the second possible implementation of the second aspect, in a third possible implementation, after the terminal performs signaling transmission with the network device on the allocated radio resource, the terminal further includes:

The terminal receives the channel mode modification indication information sent by the BSC, and adjusts the assigned TCH to a voice service transmission mode according to the indication information.

With reference to the first, second or third possible implementation of the second aspect, in a fourth possible implementation, the CSFB indication information includes a CSFB identifier and a call type, and the call type includes a calling Or called.

With reference to the first possible implementation manner of the second aspect, in a fifth possible implementation manner, when the first network is the UMTS network, the access request is an RRC connection request message;

Receiving, by the terminal, the radio resources assigned by the network device includes:

When the call initiated by the terminal is in the RRC setup phase, the terminal receives an RRC connection setup message sent by the radio network controller RNC, and obtains the specific SRB rate carried in the RRC connection setup message; The specific SRB rate is that the RNC assigns to the terminal according to the first policy; and/or,

When the call initiated by the terminal is in the RAB establishment phase, the terminal receives a radio bearer RB setup message sent by the RNC, and acquires an air interface asynchronous transmission mode carried in the RB setup message; The air interface asynchronous transmission mode is that the RNC assigns the terminal according to the second policy.

In a third aspect, a network device is provided, including:

a receiving module, configured to receive an access request sent by the terminal, where the access request carries CSFB indication information, where the CSFB indication information is used to indicate that the terminal is back from the second network that resides to the network device. The first network to access the CSFB terminal;

a resource assignment module, configured to: according to the CSFB indication information carried in the access request received by the receiving module, when the terminal is a CSFB terminal, according to a resource configuration preset for the CSFB terminal a policy, assigning a radio resource to the terminal;

And a signaling processing module, configured to perform signaling transmission with the terminal on the radio resource that is allocated by the resource assignment module.

With reference to the third aspect, in a first possible implementation, the first network is a global mobile communication system GSM network, and the resource configuration policy includes: assigning a service channel TCH to the CSFB terminal, where the TCH is used. For signaling transmission; or,

The first network is a universal mobile communication system UMTS network, and the resource configuration policy includes: the call initiated by the CSFB terminal is in a radio resource control RRC establishment phase, and the CSFB terminal is assigned a specific signaling wireless bearer. The SRB rate is used for signaling transmission, and/or the call initiated by the CSFB terminal is in a radio access bearer RAB establishment phase, and the CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner, when the first network is the GSM network, the network device is a base station controller BSC, and the accessing The request is a channel request message; the resource assignment module is specifically configured to: assign a TCH to the terminal according to the resource configuration policy, and send the assigned TCH to the terminal and serve the terminal a base station, and indicating that the terminal and the base station of the assigned TCH are used for signaling transmission.

With the second possible implementation of the third aspect, in a third possible implementation, the resource assignment module is further configured to perform signaling transmission with the terminal on the allocated radio resource. Afterwards, the terminal is instructed to adjust the assigned TCH to a voice service transmission mode.

With reference to the first, second or third possible implementation of the third aspect, in a fourth possible implementation, the CSFB indication information includes a CSFB identifier and a call type, and the call type includes a calling Or called.

With reference to the first possible implementation manner of the third aspect, in a fifth possible implementation manner, when the first network is the UMTS network, the network device is a radio network controller RNC, and the The incoming request is an RRC connection request message;

The resource assignment module is specifically configured to: if the resource configuration policy includes that the call initiated by the CSFB terminal is in an RRC setup phase, and the CSFB terminal is assigned a specific SRB rate for signaling transmission, When the call initiated by the terminal is in the RRC setup phase, the radio resource is allocated to the terminal according to the resource configuration policy, and the specific SRB rate is included in the radio resource assigned to the terminal; Transmitting the specific SRB rate to a base station serving the terminal by using a radio link setup request message, and transmitting the specific SRB to the terminal by using an RRC connection setup message; or

And if the resource configuration policy includes that the call initiated by the CSFB terminal is in an RAB establishment phase, and the CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission, the call initiated by the terminal When the RAB is established, the air interface asynchronous transmission mode is assigned to the terminal according to the resource configuration policy; the radio bearer RB establishment message is used to indicate that the terminal and the base station serving the terminal use the The air interface asynchronous transmission mode performs signaling transmission.

The fourth aspect provides a terminal device, including:

a sending module, configured to send an access request to the network device in the first network, where the access request carries CSFB indication information, where the CSFB indication information is used to indicate that the terminal is back from the second network that resides to The first network is connected to the CSFB terminal;

a resource configuration module, configured to receive a radio resource that is assigned by the network device, where the radio resource is that the network device identifies, when the terminal is a CSFB terminal, according to the CSFB indication information carried in the access request Determining, according to the resource configuration policy set for the CSFB terminal, the terminal; And a signaling processing module, configured to perform signaling transmission with the network device on the allocated radio resource. With reference to the fourth aspect, in a first possible implementation, the first network is a global mobile communication system GSM network, and the pre-configuring the resource includes: assigning a service channel TCH to the CSFB terminal, The TCH is used for signaling transmission; or

The first network is a universal mobile communication system (UMTS) network, and the resource configuration policy includes: the call initiated by the CSFB terminal is in a radio resource control RRC establishment phase, and the CSFB terminal is assigned a specific signaling radio bearer SRB. The rate is signaled, and/or the call initiated by the CSFB terminal is in a radio access bearer RAB setup phase, and the CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner, when the first network is the GSM network, the access request is a channel request message;

The resource configuration module is specifically configured to: receive, by the BSC, a TCH that is assigned to the terminal according to the resource configuration policy in advance, where the assigned TCH is used for signaling transmission.

With reference to the second possible implementation manner of the fourth aspect, in a third possible implementation, the resource configuration module is further configured to: receive channel mode modification indication information sent by the BSC, and according to the indication information The assigned TCH is adjusted to a voice service transmission mode.

With reference to the first, second or third possible implementation of the fourth aspect, in a fourth possible implementation, the CSFB indication information includes a CSFB identifier and a call type, and the call type includes a calling Or called.

With reference to the first possible implementation manner of the foregoing aspect, in a fifth possible implementation manner, when the first network is the UMTS network, the access request is an RRC connection request message;

The resource configuration module is specifically configured to: if the resource configuration policy includes that the call initiated by the CSFB terminal is in an RRC setup phase, and the CSFB terminal is assigned a specific SRB rate for signaling transmission, When the terminal initiated call is in the RRC setup phase, the RRC connection setup message sent by the radio network controller RNC is received, and the radio resource carried in the RRC connection setup message is acquired, and the radio resource carried in the RRC connection setup message is received. Include the specific SRB rate, where the specific SRB rate is that the RNC assigns to the terminal according to the resource configuration policy;

And if the resource configuration policy includes that the call initiated by the CSFB terminal is in an RAB establishment phase, and the CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission, the call initiated by the terminal Receiving a radio bearer RB setup message sent by the RNC, and acquiring an air interface asynchronous transmission mode according to the RB setup message, where the air interface asynchronous transmission mode is the RNC according to the resource configuration policy. Assigned to the terminal.

In a fifth aspect, a network device is provided, including:

An access unit, configured to receive an access request sent by the terminal, where the access request carries CSFB indication information, where

The CSFB indication information is used to indicate that the terminal is back from the second network that resides to the first network where the network device is located. The CSFB terminal that accesses the network;

a processing unit, configured to: according to the CSFB indication information carried in the access request received by the access unit, when the terminal is a CSFB terminal, according to a resource configuration policy set in advance for the CSFB terminal And assigning a radio resource to the terminal; and performing signaling transmission with the terminal on the radio resource that is allocated by the resource assignment module.

With reference to the fifth aspect, in a first possible implementation, the first network is a global mobile communication system GSM network, and the resource configuration policy includes: assigning a service channel TCH to the CSFB terminal, where the TCH is used. For signaling transmission; or,

With reference to the first possible implementation manner of the fifth aspect, in a second possible implementation manner, when the first network is the GSM network, the network device is a base station controller BSC, and the accessing The request is a channel request message; the processing unit is specifically configured to: assign a TCH to the terminal according to the resource configuration policy, and send the assigned TCH to the terminal and serve the terminal a base station, and indicating that the terminal and the base station of the assigned TCH are used for signaling transmission.

With reference to the second possible implementation manner of the fifth aspect, in a third possible implementation, the processing unit is further configured to: after performing signaling transmission with the terminal on the allocated radio resource, Instructing the terminal to adjust the assigned TCH to a voice service transmission mode.

With reference to the first, second or third possible implementation of the fifth aspect, in a fourth possible implementation, the CSFB indication information includes a CSFB identifier and a call type, and the call type includes a calling Or called.

With reference to the first possible implementation manner of the fifth aspect, in a fifth possible implementation manner, when the first network is the UMTS network, the network device is a radio network controller RNC, and the The incoming request is an RRC connection request message;

The processing unit is specifically configured to: if the resource configuration policy includes that the call initiated by the CSFB terminal is in an RRC setup phase, and the CSFB terminal is assigned a specific SRB rate for signaling transmission, When the terminal-initiated call is in the RRC setup phase, the terminal allocates the radio resource to the terminal according to the resource configuration policy, and includes the specific SRB rate in the radio resource assigned to the terminal; a link setup request message transmitting the specific SRB rate to a base station serving the terminal, and transmitting the specific SRB to the terminal by using an RRC connection setup message; or

And if the resource configuration policy includes that the call initiated by the CSFB terminal is in an RAB establishment phase, and the CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission, the call initiated by the terminal At When the RAB is established, the terminal allocates an air interface asynchronous transmission mode according to the resource configuration policy; and the radio bearer RB establishment message indicates that the terminal and the base station serving the terminal use the air interface Asynchronous transmission mode for signaling transmission.

In a sixth aspect, a terminal device is provided, including:

a radio unit, configured to send an access request to the network device in the first network, where the access request carries CSFB indication information, where the CSFB indication information is used to indicate that the terminal is back from the second network that resides to The first network is connected to the CSFB terminal;

a baseband processing unit, configured to receive, by the radio frequency unit, a radio resource that is allocated by the network device, where the radio resource is that the network device identifies, according to the CSFB indication information carried in the access request, When the terminal is a CSFB terminal, the resource configuration policy set for the CSFB terminal is assigned to the terminal; and, on the allocated radio resource, signaling by using the radio frequency unit and the network device transmission.

With reference to the sixth aspect, in a first possible implementation, the first network is a global mobile communication system GSM network, and the pre-configuring the resource includes: assigning a service channel TCH to the CSFB terminal, The TCH is used for signaling transmission; or

With reference to the first possible implementation manner of the sixth aspect, in a second possible implementation manner, when the first network is the GSM network, the access request is a channel request message;

The baseband processing unit is configured to receive, by the radio frequency unit, the TCH that is allocated to the terminal according to the resource configuration policy in advance, and the assigned TCH is used for signaling transmission.

With reference to the second possible implementation manner of the sixth aspect, in a third possible implementation, the baseband processing unit is further configured to receive, by using the radio frequency unit, channel mode modification indication information that is sent by the BSC, and And adjusting the assigned TCH to a voice service transmission mode according to the indication information.

With reference to the first, second or third possible implementation manner of the sixth aspect, in a fourth possible implementation, the CSFB indication information includes a CSFB identifier and a call type, and the call type includes a calling Or called.

With reference to the first possible implementation manner of the sixth aspect, in a fifth possible implementation manner, when the first network is the UMTS network, the access request is an RRC connection request message;

The baseband processing unit is specifically configured to: if the resource configuration policy includes that the call initiated by the CSFB terminal is in an RRC setup phase, and the CSFB terminal is assigned a specific SRB rate for signaling transmission, Receiving, by the radio frequency unit, the radio network controller RNC sends the call initiated by the terminal in the RRC establishment phase.

An RRC connection setup message is obtained, and the radio resource carried in the RRC connection setup message is obtained, where the RRC connection is established. The radio resource carried in the information includes the specific SRB rate, where the specific SRB rate is that the RNC assigns to the terminal according to the resource configuration policy;

And if the resource configuration policy includes that the call initiated by the CSFB terminal is in an RAB establishment phase, and the CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission, the call initiated by the terminal Receiving, by the radio frequency unit, a radio bearer RB setup message sent by the RNC, and acquiring an air interface asynchronous transmission mode according to the RB setup message, wherein the air interface asynchronous transmission mode is the RNC according to the RNC. The resource configuration policy is assigned to the terminal.

In the foregoing embodiment of the present invention, a resource configuration policy is set in advance for the CSFB terminal. After receiving the access request sent by the terminal, the network device identifies the terminal as a CSFB terminal according to the CSFB indication information carried in the access request. The CSFB terminal is assigned a radio resource according to the resource configuration policy set for the CSFB terminal, and the CSFB terminal performs signaling transmission with the terminal on the assigned radio resource, so that the CSFB terminal can be specifically targeted to the CSFB terminal. Assigning radio resources, and thus assigning highly efficient radio resources to CSFB terminals to reduce CSFB delay. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a CSFB scheme in the prior art;

2A is a schematic flowchart of a CSFB implementation solution according to an embodiment of the present invention;

2B is a schematic flowchart of another CSFB implementation solution according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of CSFB flow signaling from an LTE network to a GSM network according to an embodiment of the present invention; FIG. 4 is a schematic diagram of RRC establishment in a CSFB flow from an LTE network to a UMTS network according to an embodiment of the present invention; Stage signaling diagram;

FIG. 5 is a schematic diagram of signaling in an RAB establishment phase in a CSFB process of an LTE network falling back to a UMTS network according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a network device according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of another network device according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of another terminal device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS Embodiments of the present invention provide a CSFB implementation scheme, in which a resource configuration policy is set for a CSFB terminal in advance, and a CSFB terminal that falls back from the LTE network to the 2G/3G network is identified, and when the CSFB terminal is identified, The resource configuration policy is set in advance for the CSFB terminal, and a signaling connection is established to transmit signaling. Among them, by setting the CSFB terminal in advance The resource allocation policy is configured to perform signaling transmission for the CSFB terminal to assign the "preferred resource", thereby reducing the signaling transmission delay in the CSFB process compared with the prior art. The so-called "advantageous resources" are resources with a high transmission rate.

FIG. 2A is a schematic flowchart of a CSFB implementation solution according to an embodiment of the present invention. The implementation is implemented by a network side, as follows.

Step 201: The network device in the first network receives an access request sent by the terminal, where the access request carries CSFB indication information, where the CSFB indication information is used to indicate that the terminal falls back from the second network that resides to The first network is connected to the CSFB terminal;

Step 202: If the network device identifies that the terminal is a CSFB terminal according to the CSFB indication information, assigning a radio resource to the terminal according to a resource configuration policy set in advance for the CSFB terminal;

Step 203: The network device performs signaling transmission with the terminal on the allocated radio resource.

Specifically, in a scenario where the first network is a GSM network, the resource configuration policy may include: assigning a TCH (traffic channel) to the CSFB terminal, where the TCH is used for signaling transmission; the network device may be BSC (Base Station Controller); The access request may be a channel request message.

In the foregoing step 202, assigning the radio resource to the terminal according to the resource configuration policy set by the CSFB terminal in advance may include:

Assigning a TCH to the terminal according to the resource configuration policy;

And transmitting the assigned TCH to the terminal and the base station serving the terminal, and instructing the terminal and the base station to use the assigned TCH for signaling transmission.

Further, after the BSC performs signaling transmission with the terminal on the allocated radio resource, the method may further include: instructing the terminal to adjust the assigned TCH to a voice service transmission mode.

Specifically, in a scenario where the first network is a UMTS network, the resource configuration policy may include: a first policy: a call initiated by a CSFB terminal is in a radio resource control RRC (Radio Resource Control) establishment phase. Transmitting, by the CSFB terminal, a specific signaling radio bearer (SRB) rate for signaling transmission; and/or,

The second strategy: The call initiated by the CSFB terminal is in the radio access bearer RAB (Radio Access Bearer) establishment phase, and the CSFB terminal is assigned the air interface asynchronous transmission mode for signaling transmission. The network device is an RNC (Radio Network Controller), and the access request is an RRC connection request message.

When the resource configuration policy includes the foregoing first policy, the call initiated by the CSFB terminal is in an RRC establishment phase, and the RNC assigns the specific SRB rate to the terminal according to the first policy. Transmitting the specific SRB rate to the base station serving the terminal by using a radio link setup request message, and establishing by using an RRC connection Sending the specific SRB to the terminal; or

When the resource configuration policy includes the foregoing second policy, when the call initiated by the terminal is in the RAB establishment phase, the RNC allocates an air interface asynchronous transmission to the terminal according to the second policy. a mode of indicating that the terminal and the base station serving the terminal use the air interface asynchronous transmission mode to perform signaling transmission by using an RB setup message; or

When the resource configuration policy includes the foregoing first policy and the foregoing second policy, the call initiated by the CSFB terminal is in an RRC establishment phase, and the RNC assigns the terminal to the terminal according to the first policy. a specific SRB rate, the specific SRB rate is sent to the base station serving the terminal by a radio link setup request message, and the specific SRB is sent to the terminal by using an RRC connection setup message; When the initiated call is in the RAB establishment phase, the RNC assigns an air interface asynchronous transmission mode to the terminal according to the second policy, and indicates the terminal and the terminal by using an RB setup message. The serving base station uses the air interface asynchronous transmission mode for signaling transmission.

It can be seen that the resource configuration policy is set for the CSFB terminal in advance. After the network device receives the access request sent by the terminal, if the network device identifies the terminal as a CSFB terminal according to the CSFB indication information carried in the access request, Assigning a radio resource to the CSFB terminal according to the resource configuration policy set for the CSFB terminal, so that the CSFB terminal performs signaling transmission with the terminal on the assigned radio resource, so that the CSFB terminal can be targeted to the CSFB terminal. It is equipped with radio resources with high transmission efficiency, which can reduce the CSFB delay.

As shown in FIG. 2B, it is a schematic flowchart of another CSFB implementation solution provided by an embodiment of the present invention. The embodiment is implemented by a terminal, as follows.

Step 210: The terminal sends an access request to the network device in the first network, where the access request carries the CSFB indication information, where the CSFB indication information is used to indicate that the terminal is back from the second network that resides. a CSFB terminal that accesses the first network;

Step 211: The terminal receives the radio resource assigned by the network device, where the radio resource is that the network device identifies that the terminal is a CSFB terminal according to the CSFB indication information carried in the access request. Determining, according to the resource configuration policy set for the CSFB terminal, the terminal;

Step 212: The terminal performs signaling transmission with the network device on the allocated radio resource.

Specifically, in a scenario where the first network is a GSM network, the resource configuration policy is consistent with the related description in the embodiment shown in FIG. 2A; the access request is a channel request message; and the network device is a BSC. .

The terminal receives the TCH that the BSC assigns to the terminal according to a resource configuration policy set in advance for the CSFB terminal, and the assigned TCH is used for signaling transmission. The terminal performs signaling transmission with the network device on the assigned radio resource, and further, after performing signaling transmission with the network device, the terminal receives a channel mode modification sent by the BSC. Instructing information, and adjusting the assigned TCH to a voice service transmission mode according to the indication information. Specifically, in a scenario where the first network is a UMTS network, the resource configuration policy may include a first policy and/or a second policy in the embodiment shown in FIG. 2A; the network device is an RNC, and the The incoming request is an RRC Connection Request message.

In a scenario where the first network is a UMTS network, step 211 may include:

When the call initiated by the terminal is in the RRC setup phase, the terminal receives an RRC connection setup message sent by the RNC, and acquires a specific SRB rate carried in the RRC connection setup message, where the specific SRB rate Determining, by the RNC, the terminal according to the first policy; and/or,

The embodiments of the present invention are described in detail below by taking an example from the LTE network to the 2G network and the LTE network to the 3 network.

After the voice call request is initiated by the terminal residing in the LTE network, the LTE network is returned to the GSM network for voice call service. The specific implementation process of the embodiment of the present invention is described in detail.

The GSM network is mainly composed of MS (Mobile Station), Base Station Subsystem (BSS) and Switching Network Subsystem (NSS). The MS is a device used by users in the GSM mobile communication network. The BTS (Base Transceiver Station) and the BSC form a base station subsystem. The base station subsystem is directly connected to the MS through a wireless interface, and is responsible for wireless transmission and reception and radio resource management. The base station subsystem is connected to the MSC (Mobile Switching Center) in the switching network subsystem to implement communication connections between users, and to transmit system signals and user information.

In the embodiment of the present invention, after the terminal currently camping on the LTE network initiates a voice call, an eNB (evolved NodeB, ie, a base station) in the LTE network selects a target cell in the GSM network for the UE, and indicates the terminal. Returning to the GSM network for voice call service, the terminal initiates a voice caller CSFB procedure to the BTS of the target cell according to the indication.

Usually, in the calling CSFB process, during the access phase, the terminal is in the SDCCH ( Stand-Alone Dedicated Control).

The signaling interaction is performed on the channel (independent dedicated control channel). After the signaling interaction is completed, the terminal is assigned a TCH to transmit voice services in the TCH (traffic channel) assignment phase.

In the embodiment of the present invention, the following resource configuration policy is set in advance for the CSFB terminal: Assigning a TCH to the CSFB terminal Line signaling transmission. In the access phase, the channel request (Channel Request) sent by the terminal carries the CSFB indication information, which is used to indicate that the terminal is a CSFB terminal, and after receiving the channel request sent by the terminal, the BSC recognizes that the terminal is a CSFB terminal. Then, the terminal is assigned a TCH channel to transmit signaling according to the foregoing resource configuration policy, and the terminal completes a signaling interaction process on the designated TCH channel. Further, after the signaling completes the interaction, the BSC adjusts the TCH mode modification process to adjust the TCH channel allocated to the terminal for transmitting signaling to transmit the voice service, enter the voice phase, and perform a normal voice conversation.

In the channel request (Channel Request) initiated by the terminal of the GSM network, since the CSFB indication information is not carried therein, the existing mode is still used for access, for example, the terminal is assigned the SDCCH channel for transmission during the access phase. Signaling, in the TCH assignment phase, the terminal is assigned a TCH channel to transmit voice traffic.

The SDCCH channel can only transmit 23 bytes per 235ms, and the TCH channel transmission rate theory is twice that of the SDCCH channel. Therefore, using the TCH channel instead of the SDCCH channel to transmit signaling can improve the signaling transmission efficiency and reduce the CSFB delay compared with the prior art.

Figure 3 shows the signaling interaction process of the above process. As shown in the figure, after the terminal camping on the LTE network initiates a voice call, the e B indicates that the terminal falls back to the GSM network to perform voice service, and the terminal performs CSFB fallback according to the indication, and the signaling interaction process of the CSFB fallback process may include :

Step 301: The MS sends a Channel Request message to the BTS on the RACILh (Random Access Channel). The request message carries CSFB indication information to indicate that the MS is a CSFB terminal, that is, a terminal that falls back from the LTE network to the GSM network.

In the embodiment of the present invention, the Channel Request message may be extended to carry the CSFB indication information, and the CSFB indication information may include the CSFB indication identifier, and may also include the call type (ie, whether the CSFB terminal is a calling user or a called user). Specifically, for the terminal that falls back from the LTE network to the GSM network (including the calling party and the called party), the bit value that is not used in the access reason in the Channel Request message is defined, for example, the unused access reason is used. The bit value 1111 is used as a CSFB indication flag to identify the CSFB terminal. Of course, the MS can also carry the CSFB indication information in the Channel Request message by other means, for example, adding a new information unit in the Channel Request message to carry the CSFB indication information, which is no longer enumerated.

Step 302: The BTS sends a Channel Required message to the BSC according to the received Channel Request message, where the CSFB carries the CSFB indication information.

Step 303: After receiving the Channel Required message, the BSC identifies that the MS is a CSFB terminal according to the CSFB indication information carried in the message, and assigns the radio resource to the MS according to the resource configuration policy set for the CSFB terminal. The BSC sends a Channel Activation message to the BTS to indicate the assigned radio resource.

In this step, the BSC-assigned radio resource includes a TCH channel, which will be used to transmit signaling during the call setup process, and the BSC sends the assigned TCH to the BTS through the Channel Activation message.

Step 304: After receiving the Channel Activation message, the BTS opens a power amplifier on the indicated TCH channel. Start receiving information in the upstream direction. The BTS sends a Channel Activation Acknowledge message to the BSC; the message is sent on the AGCH (Access Grant Channel) in the Um interface, and is used to indicate to the MS the assigned TCH channel;

Step 306: The MS performs signaling transmission with the BTS and the BSC on the TCH assigned to it. The signaling transmission process performed may include some or all of the following steps:

The MS sends a SABM (Set Asynchronous Balanced Mode) frame access on the TCH channel, and the BTS returns a UA frame on the TCH channel for confirmation;

The BTS sends an Establishment Indication message to the BSC, where the message includes the CM Service Request (CM: Connection Management, meaning connection management) message content; the BSC establishes the A interface (ie, the interface between the BSC and the MSC) The SCCP (Skinny Call Control Protocol) link sends a CM Service Request message to the MSC; the MSC returns a link confirmation message to the BSC; the MSC sends a CM Service Accepted message to the MS, on the Um interface (ie The message between the BTS and the MS) is sent on the TCH channel;

The MS performs some or all of the following processes according to the actual situation: LAU (Location Area Update), RAU (Routing Area Update), GPRS Suspend (GPRS SUSPEND; GPRS: General Packet Radio Service, meaning General Processes such as packet radio service, class acquisition, authentication, encryption, identity, TMSI (Temporary Mobile Subscriber Identity), and the signaling of the interaction in these processes is transmitted on the TCH channel.

Step 307: The MS sends a Setup message on the TCH channel.

Step 308: The MSC sends a Call Proceeding message to the MS. In the Um interface, the message is sent on the TCH channel.

Step 309: The MSC sends an Alerting message to the MS, and the calling MS hears a ringback tone, and the message is sent on the FACCH (Fast Associated Control Channel) channel in the Um interface.

Step 310: The MSC sends an Assignment Request message to the BSC to request the assignment of the TCH channel. Step 311: After receiving the Assignment Request message, the BSC indicates that the TCH channel is adjusted by the BTS. For the transmission of voice services.

In this step, the BSC may send a Mode Modify message to the BTS to indicate that the TCH channel is adjusted to transmit a voice service, and the message is sent on the TCH;

Step 312: After modifying the mode of the TCH channel according to the indication of the BSC, the BTS returns to the BSC.

Acknowledge message, which is sent on the TCH;

Step 313: The BSC instructs the MS to adjust the TCH channel to transmit voice traffic. In this step, the MSC can send to the MS Channel Mode Modify message to indicate that the TCH channel is adjusted to transmit voice traffic; Step 314: The MS modifies the mode of the TCH channel according to the Channel Mode Modify message, accesses the voice channel, and

The MSC returns a Channel Mode Modify ACK message;

Step 315: The BSC sends an Assignment Complete message to the MSC, and considers the call to be in a call state;

Step 316: The MSC sends a Connect message to the MS, and the message is sent on the FACCH channel in the Um interface.

Step 317: The MS returns a Connect Acknowledge message to the MSC on the FACCH channel. Step 318: The calling MS and the called MS enter a voice call state.

Through the above process, it can be seen that the calling subscriber who falls back to the 2G network by CSFB identifies the 2G network when it is initially accessed, and achieves the purpose of identifying the CSFB terminal, and has high transmission efficiency through the assignment in the call flow. The TCH channel replaces the SDCCH channel for signaling transmission, thereby accelerating the transmission of air interface signaling and reducing the interaction delay.

For the case where the called user falls back from the LTE network to the 2G network, the processing manner is similar to the process in which the calling user drops back from the LTE network to the 2G network, and details are not described herein.

Through the above process, it can be seen that, in the scenario of falling back to the GSM network, a resource configuration policy is set in advance for the CSFB terminal, and when the network device receives the access request sent by the terminal, according to the CSFB indication information carried in the access request. Recognizing that the terminal is a CSFB terminal, the CSFB terminal is assigned a TCH to transmit signaling according to a resource configuration policy set for the CSFB terminal, so that the CSFB can be reduced compared with the prior art for assigning the SDCCH to the terminal to transmit signaling. Delay.

After the voice call request is initiated by the terminal residing in the LTE network, the VoIP network is dropped from the LTE network to the UMTS network for voice call service. The specific implementation process of the embodiment of the present invention is described in detail.

The UMTS network consists of a Core Network (CN) and a Radio Network Subsystem (RNS). The RNS includes an RNC that controls radio resources in the access network. Each RNC can cover multiple NodeBs. The NodeB is a logical entity equivalent to the base transceiver station, which is controlled by the RNC to provide physical wireless link connection between the mobile device (UE) and the Radio Network Subsystem (RNS).

The call setup procedure initiated by the UE in the UMTS network includes two phases: first, the RRC setup phase, and then the RAB setup phase. The UE and the network perform signaling interaction through the RRC connection established in the RRC establishment phase, and the RAB transmits voice data and multimedia service data between the UE and the core network through the RAB establishment phase.

In the embodiment of the present invention, the following resource configuration policy is set in advance for the CSFB terminal: the CSFB terminal is assigned a specific SRB rate for signaling transmission in the RRC establishment phase, and/or the air interface asynchronous transmission mode is assigned to the CSFB terminal in the RAB establishment phase. Signaling is performed. In the RRC setup phase, the RNC identifies the CSFB terminal according to the RRC Connect Request message sent by the UE, and uses the higher SRB rate for the CSFB terminal to speed up the air interface signaling transmission and reduce the signaling interaction delay. In the RAB establishment phase, for the CSFB terminal, the air interface asynchronous transmission mode is used. Signaling interaction to speed up RAB establishment and reduce signaling interaction delay. The measures for reducing the signaling interaction delay used in the foregoing RRC establishment phase, and the measures for reducing the signaling interaction delay used in the RAB establishment phase may be used separately or in combination, that is, only in the RRC establishment phase. Using the process provided by the embodiment of the present invention, the existing process is still used in the RAB establishment phase; or the existing process is used in the RRC establishment phase, and the process provided by the embodiment of the present invention is used in the RAB establishment phase; or, in the RRC establishment phase. In the establishment phase of the RAB, the process provided by the embodiment of the present invention is used.

4 is a schematic diagram of a signaling process in an RRC setup phase according to an embodiment of the present invention. After a terminal camping on an LTE network initiates a voice call, e B in the LTE network indicates that the terminal falls back to the UNTS network for voice service. The terminal performs the CSFB fallback according to the indication, and the RRC establishment process in the CSFB fallback process may include:

Step 401: The UE sends an RRC Connection Request message through the uplink CCCH (Common Control Channel) to request to establish an RRC connection. The UE is a UE that returns from the LTE network to the UMTS network for voice call service. Therefore, the UE carries the CSFB indication information in the RRC Connection Request message.

Step 402: The RNC identifies that the UE is a CSFB terminal according to the RRC Connection Request message, and therefore assigns a radio resource to the UE according to a resource configuration policy set in advance for the CSFB terminal, and sends a BAP (NodeB Application Part) protocol to the NodeB. Radio Link Setup Request message.

In this step, the radio resource allocated by the RRC for the UE may include an RNTI (Radio Network Temporary Identity), an SRB rate, an L1 resource, an L2 resource, and the like for the UE, where the UE is assigned The SRB rate is 27.2 kbps (for the RRC Connection Request message initiated by the UE residing in the UMTS network, since the CSFB indication information is not carried therein, the SRB rate assigned to the UE is 13.6 kbps).

Step 403: After the NodeB resource is successfully prepared, answer the Radio Link Setup Response message to the RNC.

Step 404: The RNC establishes an Iub interface (that is, an interface between the NodeB and the RNC) user plane transport bearer by using an Access Link Control Application Part (ALCAP) protocol.

Steps 405~406: The uplink and downlink synchronization process is performed between the RNC and the NodeB.

Step 407: The RNC sends an RRC Connection Setup message to the UE through the downlink CCCH channel, where the message includes the radio resource assigned by the RNC, where the SRB of 27.2 kbps is indicated.

Step 408: The NodeB sends a Radio Link Restore Indication message to the RNC. Step 409: After confirming that the RRC connection is successfully established, the UE sends an RRC Connection Setup Complete (RRC Connection Setup Complete) message to the RNC on the established uplink DCCH (Dedicated Control Channel). The RRC connection establishment process ends.

Through the above process, it can be seen that after the RNC recognizes that the CSFB terminal is dropped from the LTE network to the UMTS network, the SRB rate assigned to the user is 27.2 kbps when the radio resource is assigned to it; Original station Users who remain in the UMTS network as well as CSFB terminals typically have an SRB rate of 13.6 kbps. It can be seen that, compared with the prior art, the embodiment of the present invention provides a reduced signaling interaction delay for the CSFB fallback process of the CSFB terminal.

Referring to FIG. 5, it is a schematic diagram of a signaling process in an RAB establishment phase according to an embodiment of the present invention. After completing the RRC connection establishment process, the UE performs the following RAB establishment process:

Step 501: The CN sends a RAB Assignment Request message of the RANAP (Radio Access Network Application Part) protocol to the RNC, and initiates a RAB establishment process. Steps 502~503: The RNC receives the RAB Assignment After the request message, the QoS (Quality of Service) parameter of the RAB is mapped to the AAL2 link characteristic parameter and the radio resource characteristic parameter, and the ALCAP of the Iu interface initiates the user plane transmission of the Iu interface according to the AAL2 link characteristic parameter therein. Bearer establishment process (this step does not exist for the PS domain);

Step 504: The RNC sends a BAP protocol Radio Link Reconfiguration Prepare to the controlled NodeB.

(Radio Link Reconfiguration Preparation) message, requesting NodeB to establish a new Dedicated Transport Channel (DCH) on the existing radio link.

Step 505: After receiving the Radio Link Reconfiguration Prepare message, the NodeB assigns a corresponding resource, and sends a Radio Link Reconfiguration Ready message to the RNC to notify the RNC radio link reconfiguration.

Steps 506-509: The ALCAP protocol of the Iub interface in the RCN initiates the user plane transmission bearer establishment process of the Iub interface, and the NodeB and the RNC establish synchronization by exchanging uplink and downlink synchronization frames of the DCH frame protocol.

Step 510: The RNC sends a Radio Bearer Setup message of the RRC protocol to the UE.

In this step, if the RNC identifies that the UE is a CSFB terminal (for example, it can be identified according to the RRC Connection Request message received in the RRC setup phase), the RNC indicates the UE and other network devices (including the UE) through the Radio Bearer Setup message. The NodeB of the service uses the air interface asynchronous transmission mode for signaling interaction.

Step 511: The RNC sends a BAP Radio Link Reconfiguration Commit message to the NodeB.

Step 512: The UE sends an RB Setup Complete message to the RNC.

In step 510 of the foregoing process, when the air interface asynchronous transmission mode is used for interaction, the network device and the UE immediately start the new configuration after receiving the configuration message of the RNC. In the air interface synchronization mode, after the network device and the UE receive the configuration message of the RNC, the new configuration needs to be enabled at the synchronization time in the message. It can be seen that the signaling interaction delay when using the air interface asynchronous transmission mode is lower than the signaling interaction delay when using the air interface synchronization mode.

Of course, in this embodiment, the RNC may also assign a "preferred resource" to the CSFB terminal, that is, in the RRC establishment process or the RAB establishment process, that is, the UE is assigned a higher transmission efficiency for the voice service to fall back to the UMTS network. The resources are signaled for transmission.

Through the above process, it can be seen that in the scenario of falling back to the UMTS network, the following resources are set in advance for the CSFB terminal. The source configuration policy: signaling a specific SRB rate for the CSFB terminal in the RRC setup phase, and/or signaling the CSFB terminal to the air interface asynchronous transmission mode during the RAB establishment phase. In the RRC setup phase, the RNC identifies the CSFB terminal according to the RRC Connect Request message sent by the UE, and uses a higher SRB rate for the CSFB terminal to speed up the air interface signaling transmission and reduce the signaling interaction delay. In the RAB establishment phase, for CSFB terminals, the air interface asynchronous transmission mode is used for signaling interaction to speed up RAB establishment and reduce signaling interaction delay.

Based on the same technical concept, an embodiment of the present invention further provides a network device and a terminal device.

FIG. 6 is a schematic structural diagram of a network device according to an embodiment of the present invention. The network device can be applied to the foregoing embodiment, and can be used as a BTS in a 2G network and as an RNC in 3G. As shown, the network device 60 can include: a receiving module 61, a resource assignment module 62, and a signaling processing module 63, wherein:

The receiving module 61 is configured to receive an access request sent by the terminal, where the access request carries CSFB indication information, where the CSFB indication information is used to indicate that the terminal falls back from the resident second network to the network device. a CSFB terminal to which the first network is connected;

a resource assignment module 62, configured to identify, according to the CSFB indication information carried in the access request received by the receiving module 61, that the terminal is a CSFB terminal, according to a preset for the CSFB terminal a resource allocation policy, assigning a radio resource to the terminal;

The signaling processing module 63 is configured to perform signaling transmission with the terminal on the radio resource assigned by the resource assignment module 62.

In an implementation scenario, the first network is a GSM network, and the resource configuration policy includes: assigning a TCH to the CSFB terminal, where the TCH is used for signaling transmission; or

Further, when the first network is the GSM network, the network device is a BSC, and the access request is a channel request message. The resource assignment module 62 is specifically configured to: assign a TCH to the terminal according to the resource configuration policy, send the assigned TCH to the terminal, and a base station serving the terminal, and indicate the terminal The assigned TCH with the base station is used for signaling transmission.

Further, the resource assignment module 62 is further configured to: after the signaling transmission with the terminal on the allocated radio resource, instruct the terminal to adjust the assigned TCH to a voice service transmission mode.

Specifically, the CSFB indication information may include a CSFB identifier and a call type, and the call type may include a calling or called party.

In another implementation scenario, the first network is the UMTS network, the network device is an RNC, and the access request is an RRC connection request message. Correspondingly, the resource assignment module 62 is specifically configured to: if the resource configuration policy Including the call initiated by the CSFB terminal is in an RRC setup phase, and the CSFB terminal is assigned a specific SRB rate for signaling transmission, and when the call initiated by the terminal is in the RRC establishment phase, according to the Determining, by the resource configuration policy, the radio resource, the radio resource allocated to the terminal, including the specific SRB rate; sending the specific SRB rate to the radio link establishment request message a base station serving the terminal, transmitting the specific SRB to the terminal by using an RRC connection setup message; or

The logical structure of the network device is shown in FIG. 6. The hardware structure of the network device may be as shown in FIG. 7, and may include: an access unit 71 and a processing unit 73, and further may further include an exchange unit 72. The access unit 71 can provide an interface with the core network device, and an interface between the base station (for example, the GSM network, where the base station refers to the BTS, and the UMTS network, where the base station refers to the NodeB), etc. The entry unit 71 can be implemented by a series of single boards. The switching unit 72 provides a large-capacity, non-blocking switching function for system control management, service processing inter-board communication, and service flow connection between multiple access units 81. The access unit 71 can also be implemented by a series of boards. The processing unit 73 implements protocol processing on the control plane and the user plane, and can be implemented by a series of boards. The embodiment of the present invention pre-sets a resource configuration policy for the CSFB terminal in the processing unit 73, and improves the control plane protocol software in the processing unit 73 to implement the resource assignment module 61 and the signaling processing module 63 in FIG. The function.

As shown in FIG. 7, in the network device 70:

The access unit 71 is configured to receive an access request sent by the terminal, where the access request carries CSFB indication information, where the CSFB indication information is used to indicate that the terminal falls back from the resident second network to the network. The CSFB terminal to which the first network where the device is located is connected;

The processing unit 73 is configured to: according to the CSFB indication information carried in the access request received by the access unit, when the terminal is a CSFB terminal, according to a resource configuration preset for the CSFB terminal a policy, assigning a radio resource to the terminal; and performing signaling transmission with the terminal on the radio resource that is allocated by the resource assignment module.

Specifically, the first network is a GSM network, and the resource configuration policy includes: assigning the CSFB terminal

TCH, the TCH is used for signaling transmission; or the first network is a UMTS network, and the resource configuration policy includes: the call initiated by the CSFB terminal is in a radio resource control RRC establishment phase, and is the CSFB terminal. Assigning a specific signaling radio bearer SRB rate for signaling transmission, and/or, the call initiated by the CSFB terminal is in an RAB setup phase, and the CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission.

Specifically, when the first network is the GSM network, the network device is a base station controller BSC, The access request is a channel request message. The processing unit 73 is specifically configured to: assign, according to the resource configuration policy, a TCH to the terminal, and send the assigned TCH to the terminal and a base station serving the terminal. And indicating that the terminal and the base station of the assigned TCH are used for signaling transmission.

Further, the processing unit 73 is further configured to: after the signaling transmission with the terminal on the allocated radio resource, instruct the terminal to adjust the assigned TCH to a voice service transmission mode.

Specifically, the CSFB indication information includes a CSFB identifier and a call type, and the call type includes a calling or a called.

When the first network is the UMTS network, the network device is a radio network controller RNC, and the access request is an RRC connection request message. The processing unit 73 is specifically configured to: if the resource configuration policy includes The call initiated by the CSFB terminal is in an RRC setup phase, and the CSFB terminal is assigned a specific SRB rate for signaling transmission, and when the call initiated by the terminal is in the RRC establishment phase, according to the resource And configuring, by the terminal, the radio resource, where the radio resource allocated to the terminal includes the specific SRB rate; and sending, by using a radio link setup request message, the specific SRB rate to the radio resource The base station of the terminal service sends the specific SRB to the terminal by using an RRC connection setup message; or if the resource configuration policy includes that the call initiated by the CSFB terminal is in a RAB establishment phase, The CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission, and the call initiated by the terminal is established in the RAB. In the segment, the air interface asynchronous transmission mode is assigned to the terminal according to the resource configuration policy; the radio bearer RB setup message is used to indicate that the terminal and the base station serving the terminal use the air interface asynchronous transmission mode. Signaling transmission.

FIG. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present invention, where the terminal device is applicable to the foregoing embodiment. As shown, the terminal device 80 can include: a sending module 81, a resource configuration module 82, and a signaling processing module 83, where:

The sending module 81 is configured to send an access request to the network device in the first network, where the access request carries CSFB indication information, where the CSFB indication information is used to indicate that the terminal is configured to fall back from the second network that resides. a CSFB terminal that accesses the first network;

The resource configuration module 82 is configured to receive the radio resource that is allocated by the network device, and further configure the resource according to the allocated radio resource, where the radio resource is the network device according to the access request When the CSFB indication information carried in the CSCC terminal is identified as a CSFB terminal, the resource allocation policy set for the CSFB terminal is assigned to the terminal;

The signaling processing module 83 is configured to perform signaling transmission with the network device on the allocated radio resource. Specifically, the first network is a GSM network, and the pre-configuring the resource includes: assigning a service channel TCH to the CSFB terminal, where the TCH is used for signaling transmission; or, the first network For the UMTS network, the resource configuration policy includes: the call initiated by the CSFB terminal is in an RRC setup phase, and the CSFB terminal is assigned a specific signaling radio bearer SRB rate for signaling transmission, and/or Said call initiated by the CSFB terminal The call is in the RAB establishment phase, and the CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission.

Specifically, when the first network is the GSM network, the access request is a channel request message, and the resource configuration module 82 is specifically configured to: receive the BSC according to the resource configuration policy in advance as the terminal Assigned TCH, the assigned TCH is used for signaling transmission.

Further, the resource configuration module 82 is further configured to: receive channel mode modification indication information sent by the BSC, and adjust the assigned TCH to a voice service transmission mode according to the indication information.

When the first network is the UMTS network, the access request is an RRC connection request message; the resource configuration module 82 is specifically configured to: if the resource configuration policy includes the call initiated by the CSFB terminal In the RRC setup phase, the CSFB terminal is assigned a specific SRB rate for signaling transmission, and when the call initiated by the terminal is in the RRC setup phase, the RRC connection setup message sent by the radio network controller RNC is received, and the RRC connection setup message is obtained. a radio resource carried in the RRC connection setup message, where the radio resource carried in the RRC connection setup message includes the specific SRB rate, where the specific SRB rate is the RNC according to the resource configuration policy Assigned to the terminal;

The logical structure of the terminal device is shown in FIG. 8. The hardware structure of the terminal device may be as shown in FIG. 9, and may include: a radio frequency module 91, a baseband processing module 92, and a memory 93. The radio frequency module 91 can be implemented by a radio frequency circuit or a radio frequency chip, and is configured to convert a time domain signal into a frequency domain signal and transmit it through an antenna; the baseband processing module 92 is configured to perform communication protocol processing, and can be a series of chips including a CPU. achieve. The embodiment of the present invention improves the communication protocol processing software in the baseband processing module 92 to implement the functions of the resource configuration module 82 and the signaling processing module 83 in FIG.

As shown in FIG. 9, in the terminal device 90:

The memory 93 stores a resource configuration policy set for the CSFB terminal;

The radio frequency unit 91 is configured to send an access request to the network device in the first network, where the access request carries CSFB indication information, where the CSFB indication information is used to indicate that the terminal is falling from the second network that is camped on. a CSFB terminal that accesses the first network;

The baseband processing unit 92 is configured to receive the radio resource that is allocated by the network device by using the radio frequency unit, and further perform resource configuration according to the allocated radio resource; where the radio resource is based on the network device Place When the CSFB indication information carried in the access request identifies that the terminal is a CSFB terminal, the resource configuration policy set for the CSFB terminal is assigned to the terminal; and, on the assigned radio resource, Transmitting signaling with the network device by the radio frequency unit.

The first network is a GSM network, and the foregoing resource configuration policy includes: assigning a traffic channel TCH to the CSFB terminal, where the TCH is used for signaling transmission; or, the first network is a UMTS network The resource configuration policy includes: the call initiated by the CSFB terminal is in an RRC setup phase, the CSFB terminal is assigned a specific signaling radio bearer SRB rate for signaling transmission, and/or, at the CSFB terminal The initiated call is in the RAB setup phase, and the CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission.

When the first network is the GSM network, the access request is a channel request message; the baseband processing unit 92 is specifically configured to: receive, by the radio frequency unit, the BSC according to the resource configuration policy in advance The terminal assigned TCH, the assigned TCH is used for signaling transmission.

Further, the baseband processing unit 92 is further configured to: receive, by using the radio frequency unit, channel mode modification indication information sent by the BSC, and adjust the assigned TCH to a voice service transmission mode according to the indication information.

When the first network is the UMTS network, the access request is an RRC connection request message; the baseband processing unit 92 is specifically configured to: if the resource configuration policy includes the call initiated by the CSFB terminal is In the RRC setup phase, the CSFB terminal is assigned a specific SRB rate for signaling transmission, and when the call initiated by the terminal is in the RRC setup phase, the radio frequency unit receives the RRC sent by the radio network controller RNC. a connection establishment message, the radio resource carried in the RRC connection setup message, where the radio resource carried in the RRC connection setup message includes the specific SRB rate, where the specific SRB rate is the RNC according to the RNC The resource configuration policy is assigned to the terminal; if the resource configuration policy includes the call initiated by the CSFB terminal in the RAB establishment phase, the CSFB terminal is assigned an air interface asynchronous transmission mode to perform a message. The transmission is performed, and when the call initiated by the terminal is in the RAB establishment phase, the radio unit is connected. The radio bearer RB setup message sent by the RNC is received, and the air interface asynchronous transmission mode is obtained according to the RB setup message. The air interface asynchronous transmission mode is that the RNC allocates the terminal according to the resource configuration policy.

In the foregoing embodiment of the present invention, a resource configuration policy is set in advance for the CSFB terminal. After receiving the access request sent by the terminal, the network device identifies the terminal as a CSFB terminal according to the CSFB indication information carried in the access request. The CSFB terminal is assigned a radio resource according to the resource configuration policy set for the CSFB terminal, and the CSFB terminal performs signaling transmission with the terminal on the assigned radio resource, so that the CSFB terminal can be specifically targeted to the CSFB terminal. Assigning radio resources, and thus assigning highly efficient radio resources to CSFB terminals to reduce CSFB delay.

The present invention is directed to a flowchart of a method, apparatus (system), and computer program product in accordance with an embodiment of the present invention. And / or block diagram to describe. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, it is intended that the present invention cover the modifications and modifications of the inventions

Claims

Rights request

1. A circuit domain fallback CSFB implementation method, characterized in that the method includes:

The network device in the first network receives an access request sent by the terminal. The access request carries CSFB indication information. The CSFB indication information is used to instruct the terminal to fall back to the third network from the second network where it resides. CSFB terminal for network access;

If the network device identifies that the terminal is a CSFB terminal according to the CSFB indication information, it allocates wireless resources to the terminal according to the resource configuration policy preset for the CSFB terminal;

The network device performs signaling transmission with the terminal on the assigned wireless resource.

2. The method of claim 1, wherein the first network is a Global System for Mobile Communications (GSM) network, and the resource configuration strategy includes: assigning a traffic channel TCH to the CSFB terminal, and the TCH uses for signaling transmission; or,

The first network is a Universal Mobile Communications System UMTS network, and the resource configuration strategy includes: a first strategy and/or a second strategy, wherein the first strategy is that calls initiated at the CSFB terminal are under radio resource control In the RRC establishment phase, the CSFB terminal is assigned a specific signaling radio bearer SRB rate for signaling transmission; the second strategy is that the call initiated by the CSFB terminal is in the radio access bearer RAB establishment phase, which is The CSFB terminal assigns an air interface asynchronous transmission mode for signaling transmission.

3. The method of claim 2, wherein when the first network is the GSM network, the access request is a channel request message;

Based on the resource configuration policy set in advance for the CSFB terminal, assigning wireless resources to the terminal includes: the base station controller BSC assigns TCH to the terminal according to the resource configuration policy;

The BSC sends the assigned TCH to the terminal and the base station serving the terminal, and instructs the terminal and the base station that the assigned TCH is used for signaling transmission.

4. The method according to claim 3, characterized in that, after the network device performs signaling transmission with the terminal on the assigned wireless resource, it further includes:

5. The method according to any one of claims 2 to 4, characterized in that the CSFB indication information includes a CSFB identification and a call type, and the call type includes the calling party or the called party.

6. The method of claim 2, wherein when the first network is the UMTS network, the access request is an RRC connection request message;

Based on the resource configuration policy set in advance for the CSFB terminal, assigning wireless resources to the terminal includes: if the resource configuration policy includes the first policy, then the call initiated by the terminal is in the During the RRC establishment phase, the radio network controller RNC assigns the specific SRB rate to the terminal according to the second policy; The RNC sends the specific SRB rate to the base station serving the terminal through a wireless link establishment request message, and sends the specific SRB to the terminal through an RRC connection establishment message; or,

If the resource configuration policy includes the second policy, when the call initiated by the terminal is in the RAB establishment phase, the RNC assigns air interface asynchronous transmission to the terminal according to the second policy mode; the RNC instructs the terminal and the base station serving the terminal to use the air interface asynchronous mode for signaling transmission through a radio bearer RB establishment message; or,

If the resource configuration policy includes the first policy and the second policy, the call initiated by the CSFB terminal is in the RRC establishment phase, and the RNC assigns the terminal to the RRC according to the first policy. The specific SRB rate is sent to the base station serving the terminal through the wireless link establishment request message, and the specific SRB is sent to the terminal through the RRC connection establishment message. ; When the call initiated by the terminal is in the RAB establishment phase, the RNC assigns the air interface asynchronous transmission mode to the terminal according to the second policy, and indicates the air interface asynchronous transmission mode through the RB establishment message. The terminal and the base station serving the terminal adopt the air interface asynchronous transmission mode for signaling transmission.

7. A circuit domain fallback CSFB implementation method, characterized in that the method includes:

The terminal sends an access request to the network device in the first network. The access request carries CSFB indication information. The CSFB indication information is used to instruct the terminal to fall back to the first network from the second network where it resides. CSFB terminal for network access;

The terminal receives the wireless resource assigned by the network device; wherein, the wireless resource is when the network device identifies the terminal as a CSFB terminal according to the CSFB indication information carried in the access request, according to: The resource configuration policy set by the CSFB terminal is assigned by the terminal;

The terminal performs signaling transmission with the network device on the assigned wireless resource.

8. The method of claim 7, wherein the first network is a Global System for Mobile Communications (GSM) network, and the resource configuration strategy includes: assigning a traffic channel TCH to the CSFB terminal, and the TCH uses for signaling transmission; or,

9. The method of claim 8, wherein when the first network is the GSM network, the access request is a channel request message; the wireless resources include: the BSC according to the The resource configuration policy is a TCH assigned to the terminal, and the assigned TCH is used for signaling transmission.

10. The method according to claim 9, characterized in that: the terminal is on the assigned wireless resource, and After the network device performs signaling transmission, it also includes:

The terminal receives the channel mode modification indication information sent by the BSC, and adjusts the assigned TCH to the voice service transmission mode according to the indication information.

11. The method according to any one of claims 8 to 10, wherein the CSFB indication information includes a CSFB identifier and a call type, and the call type includes the calling party or the called party.

12. The method of claim 8, wherein when the first network is the UMTS network, the access request is an RRC connection request message;

The terminal receiving the wireless resources assigned by the network device includes:

When the call initiated by the terminal is in the RRC establishment stage, the terminal receives the RRC connection establishment message sent by the radio network controller RNC, and obtains the specific SRB rate carried in the RRC connection establishment message; wherein, The specific SRB rate is assigned by the RNC to the terminal according to the first policy; and/or,

When the call initiated by the terminal is in the RAB establishment stage, the terminal receives the radio bearer RB establishment message sent by the RNC, and obtains the air interface asynchronous transmission mode carried in the RB establishment message; wherein, The air interface asynchronous transmission mode is assigned by the RNC to the terminal according to the second policy.

13. A network device, characterized by including:

A receiving module, configured to receive an access request sent by the terminal, where the access request carries CSFB indication information, and the CSFB indication information is used to instruct the terminal to fall back from the second network where it resides to where the network device is located. The CSFB terminal that accesses the first network;

A resource allocation module, configured to configure the resource according to the resource configuration preset for the CSFB terminal when the terminal is identified as a CSFB terminal according to the CSFB indication information carried in the access request received by the receiving module. A strategy to allocate wireless resources to the terminal;

A signaling processing module, configured to perform signaling transmission with the terminal on the wireless resources assigned by the resource assignment module.

14. The network device according to claim 13, wherein the first network is a Global System for Mobile Communications GSM network, and the resource configuration strategy includes: assigning a traffic channel TCH to the CSFB terminal, and the TCH for signaling transmission; or,

The first network is a Universal Mobile Communications System UMTS network, and the resource configuration strategy includes: assigning a specific signaling radio bearer SRB to the CSFB terminal when a call initiated by the CSFB terminal is in the Radio Resource Control (RRC) establishment phase. The CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission when the call initiated by the CSFB terminal is in the radio access bearer RAB establishment stage.

15. The network device according to claim 14, wherein when the first network is the GSM network, the network device is a base station controller BSC, and the access request is a channel request message;

The resource assignment module is specifically configured to assign a TCH to the terminal according to the resource configuration policy, and assign the TCH to the terminal. The assigned TCH is sent to the terminal and the base station serving the terminal, and the terminal and the base station are instructed to use the assigned TCH for signaling transmission.

16. The network device according to claim 15, wherein the resource assignment module is further configured to, after performing signaling transmission with the terminal on the assigned wireless resources, instruct the terminal to The assigned TCH is adjusted to a voice service transmission mode.

17. The network device according to any one of claims 14 to 16, wherein the CSFB indication information includes a CSFB identifier and a call type, and the call type includes the calling party or the called party.

18. The network device according to claim 14, wherein when the first network is the UMTS network, the network device is a radio network controller RNC, and the access request is an RRC connection request message. ;

The resource assignment module is specifically configured to assign a specific SRB rate to the CSFB terminal for signaling transmission if the resource configuration policy includes that the call initiated at the CSFB terminal is in the RRC establishment phase. When the call initiated by the terminal is in the RRC establishment stage, the wireless resource is assigned to the terminal according to the resource configuration policy, and the wireless resource assigned to the terminal includes the specific SRB rate; Send the specific SRB rate to the base station serving the terminal through a wireless link establishment request message, and send the specific SRB to the terminal through an RRC connection establishment message; or

If the resource configuration policy includes that the call initiated by the CSFB terminal is in the RAB establishment phase and the air interface asynchronous transmission mode is assigned to the CSFB terminal for signaling transmission, then the call initiated by the terminal When in the RAB establishment phase, the air interface asynchronous transmission mode is assigned to the terminal according to the resource configuration policy; and the terminal and the base station serving the terminal are instructed to use the radio bearer RB establishment message. The air interface asynchronous transmission mode is used for signaling transmission.

19. A terminal device, characterized by: including:

A sending module, configured to send an access request to the network device in the first network, where the access request carries CSFB indication information, and the CSFB indication information is used to instruct the terminal to fall back to the second network where it resides. CSFB terminal accessed by the first network;

Resource configuration module, configured to receive wireless resources assigned by the network device; wherein, the wireless resources are when the network device identifies that the terminal is a CSFB terminal according to the CSFB indication information carried in the access request. , assigned to the terminal according to the resource configuration policy set for the CSFB terminal;

A signaling processing module, configured to perform signaling transmission with the network device on the assigned wireless resources.

20. The terminal device according to claim 19, wherein the first network is a Global System for Mobile Communications (GSM) network, and the pre-configuration strategy for the resource includes: assigning a traffic channel TCH to the CSFB terminal. , the TCH is used for signaling transmission; or,

The first network is a Universal Mobile Communications System UMTS network, and the resource configuration strategy includes: when a call initiated by the CSFB terminal is in the Radio Resource Control (RRC) establishment phase, assigning a specific signaling radio bearer to the CSFB terminal. The SRB rate is used for signaling transmission, and/or when the call initiated by the CSFB terminal is in the radio access bearer RAB establishment stage, the CSFB terminal is assigned an air interface asynchronous transmission mode for signaling transmission.

21. The terminal device according to claim 20, wherein when the first network is the GSM network, the access request is a channel request message;

The resource configuration module is specifically configured to receive the TCH assigned by the BSC to the terminal according to the resource configuration policy in advance, and the assigned TCH is used for signaling transmission.

22. The terminal device according to claim 21, wherein the resource configuration module is further configured to receive the channel mode modification indication information sent by the BSC, and modify the assigned TCH according to the indication information. Adjust to voice service transmission mode.

23. The terminal device according to any one of claims 20 to 22, characterized in that the CSFB indication information includes a CSFB identifier and a call type, and the call type includes the calling party or the called party.

24. The terminal device according to claim 20, wherein when the first network is the UMTS network, the access request is an RRC connection request message;

The resource configuration module is specifically configured to assign a specific SRB rate to the CSFB terminal for signaling transmission if the resource configuration policy includes that the call initiated at the CSFB terminal is in the RRC establishment phase. When the call initiated by the terminal is in the RRC establishment stage, receive the RRC connection establishment message sent by the radio network controller RNC, and obtain the radio resources carried in the RRC connection establishment message, and the radio resources carried in the RRC connection establishment message. includes the specific SRB rate; wherein, the specific SRB rate is assigned by the RNC to the terminal according to the resource configuration policy;

If the resource configuration policy includes that the call initiated by the CSFB terminal is in the RAB establishment phase and the air interface asynchronous transmission mode is assigned to the CSFB terminal for signaling transmission, then the call initiated by the terminal When in the RAB establishment phase, receive the radio bearer RB establishment message sent by the RNC, and obtain the air interface asynchronous transmission mode according to the RB establishment message; wherein, the air interface asynchronous transmission mode is the air interface asynchronous transmission mode that the RNC determines according to the resource configuration policy. assigned to the terminal.