CN101631352B - Rollback method, rollback system, access network equipment and core network equipment based on circuit switching - Google Patents
Rollback method, rollback system, access network equipment and core network equipment based on circuit switching Download PDFInfo
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Abstract
The invention discloses a rollback method, a rollback system, access network equipment and core network equipment based on circuit switching. The method comprises the steps of: receiving a CS call request based on the circuit switching; acquiring the wireless access capability of a target cell; and transmitting a CS rollback command containing the identification of a matching cell to user equipment when the matching cell matched with the wireless access capability of the user equipment exists in the target cell. When the embodiment of the invention is used for CS rollback, the wireless access capability of the target cell is pre-acquired, so the target cell matched with the wireless access capability supported by the user equipment can be aimingly transmitted to the user equipment when the rollback command is transmitted, and the user equipment can successfully roll back to the matched target cell, so the method reduces the failure rate of the CS rollback and improve the reliability of the CS rollback and user experience.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a fallback method and system based on circuit switching, an access network device, and a core network device.
Background
In the early stage of LTE (Long Term Evolution) EUTRAN (evolved universal Radio Access Network) deployment, IMS (IP multimedia Subsystem) cannot provide CS (Circuit Switched based) service in a VoIP manner, and if a UE (User Equipment) initiates a CS call in the Access Network, the call will fail due to termination. In the existing Network, GERAN (GSM EDGE radio Access Network, radio Access Network for GSM and EDGE), UTRAN and LET EUTRAN overlap coverage, GERAN or UTRAN can provide CS service, so in the existing Network with overlap coverage, if UE initiates a CS call in LTE EUTRAN, the call will be Fallback to Circuit domain, i.e. to GERAN or UTRAN supporting CS service, i.e. to CSFB (Circuit Switched Fallback, Fallback based on Circuit switching).
As shown in fig. 1, in a reference architecture of the CSFB, the CSFB function is implemented by reusing an SGs interface mechanism between an MSC (Mobile Switching center) Server and an MME (Mobility Management Entity), and is usually completed in a PS (Packet Switched) or NACC (Network Assisted Cell Change) manner when a UE is in an active state.
The inventor finds in the research process of the existing CS fallback that, after a call reaches the MSC of the CS domain of a called user, the MSC forwards the call to an eNodeB (base station) located in EUTRAN via an MME, and at this time, pages the called user UE in EUTRAN; under normal conditions, an eNodeB issues a measurement control command to request UE to report a measurement report so that the eNodeB can refer to the measurement report and make a decision of CS fallback by combining other information; and the eNodeB issues a rollback command to the UE according to the decision, wherein the rollback command comprises a target cell to be rolled back by the UE and a rollback mode (PS switching or NACC switching), and the UE executes a rollback flow after receiving the rollback command. However, when the UE falls back to the target cell according to the fallback command, if the target network where the target cell is located does not support the fallback mode used by the UE at this time, that is, the RAT (Radio Access Technology) capability of the target cell does not match the fallback mode (for example, the target cell only supports PS handover, and the fallback mode in the fallback command is NACC), the fallback will fail. Therefore, when the RAT capability of the target cell is not considered in decision making, the failure rate of CS fallback is increased, the establishment time of the call in the CS domain is delayed, and the user experience is reduced.
Disclosure of Invention
Embodiments of the present invention provide a fallback method and system based on circuit switching, an access network device, and a core network device, which reduce a failure rate of CSFB by considering RAT capability of a target cell during a CS fallback decision.
To achieve the purpose of the embodiment of the present invention, the embodiment of the present invention provides the following technical solutions:
a circuit-switched based fallback method, comprising:
receiving a circuit-switched based CS call request;
acquiring the wireless access capability of a target cell;
and when a matched cell matched with the wireless access capability of the user equipment exists in the target cell, issuing a CS fallback command containing the identifier of the matched cell to the user equipment.
A circuit-switched based fallback system, comprising: a base station, a mobility management entity MME and user equipment,
the base station is configured to receive a CS call request, send a request message for acquiring a radio access capability of a target cell to the MME, and send a CS fallback command to the user equipment, where the CS fallback command carries an identifier of a matching cell matching the radio access capability of the user equipment;
the MME is used for receiving the request message, matching the wireless access capability of the target cell with the wireless access capability of user equipment, and sending the identifier of the matched cell matched with the wireless access capability of the user equipment to the base station;
and the user equipment is used for executing rollback according to the CS rollback command.
A circuit-switched based fallback system, comprising: a base station, a mobility management entity MME and user equipment,
the base station is used for receiving a CS call request, sending a request message for acquiring the wireless access capability of a target cell to the MME, matching the received wireless access capability of the target cell with the wireless access capability of the user equipment, and sending a CS backspacing command to the user equipment, wherein the CS backspacing command carries an identifier of the matched cell;
the MME is used for receiving the request message and sending the acquired wireless access capability of the target cell to the base station;
and the user equipment is used for executing rollback according to the CS rollback command.
A circuit-switched based fallback system, comprising: a base station and a User Equipment (UE),
the base station is used for receiving a CS call request, sending a measurement control message to the user equipment, receiving a measurement report, and sending a CS fallback command to the user equipment when the wireless access capability of a target cell in the measurement report is matched with the wireless access capability supported by the user equipment, wherein the CS fallback command carries an identifier of a matched cell;
the user equipment is configured to receive the measurement control message, acquire the radio access capability of the target cell by reading a system broadcast message sent by a target network where the target cell is located, send a measurement report to the base station, where the measurement report includes the radio access capability of the target cell, and execute fallback according to the CS fallback command.
An access network device, comprising:
the system comprises an acquisition unit, a base station and a base station, wherein the acquisition unit is used for receiving a CS calling request based on circuit switching and acquiring the wireless access capability of a target cell;
a sending unit, configured to issue a CS fallback command including an identifier of a matching cell to the user equipment when the matching cell matching the radio access capability of the user equipment exists in the target cell.
A core network device, comprising:
the receiving unit is used for triggering the query unit after receiving the identifier of the target cell, receiving the wireless access capability corresponding to the identifier of the target cell and triggering the sending unit;
the query unit is used for sending a query request message carrying the identifier of the target cell after receiving the trigger of the receiving unit;
and the sending unit is used for sending the wireless access capability corresponding to the identifier of the target cell after receiving the trigger of the receiving unit.
When the embodiment of the invention is applied to CS fallback, the wireless access capability of the target cell is obtained in advance, so that the target cell matched with the wireless access capability supported by the target cell can be pertinently issued to the user equipment when a fallback command is issued, and the user equipment can successfully fallback to the matched target cell, thereby reducing the failure rate of CS fallback and improving the reliability of CS fallback and user experience.
Drawings
FIG. 1 is a reference architecture diagram of a CSFB;
FIG. 2 is a flowchart illustrating a circuit-switched fallback method according to a first embodiment of the present invention;
FIG. 3 is a flowchart illustrating a circuit-switched fallback method according to a second embodiment of the present invention;
FIG. 4 is a flowchart illustrating a circuit-switched fallback method according to a third embodiment of the present invention;
FIG. 5 is a flowchart illustrating a circuit-switched fallback based method according to a fourth embodiment of the present invention;
FIG. 6 is a block diagram of a fallback system based on circuit switching according to a first embodiment of the present invention;
FIG. 7 is a block diagram of a circuit-switched based fallback system in accordance with a second embodiment of the present invention;
fig. 8 is a block diagram of a first embodiment of an access network apparatus of the present invention;
fig. 9 is a block diagram of a second embodiment of an access network apparatus of the present invention;
fig. 10 is a block diagram of a third embodiment of an access network apparatus of the present invention;
fig. 11 is a block diagram of a fourth embodiment of an access network apparatus of the present invention;
fig. 12 is a block diagram of an embodiment of a core network device according to the present invention.
Detailed Description
The embodiment of the invention provides a fallback method and system based on circuit switching, access network equipment and core network equipment.
So that those skilled in the art can better understand the concept of the present invention and can better understand the objects, features, and advantages of the present invention, the present invention will be described in detail with reference to the accompanying drawings and the detailed description.
The first embodiment of the fallback method based on circuit switching according to the present invention is shown in fig. 2:
step 201: a CS call request based on circuit switching is received.
Step 202: and acquiring the wireless access capability of the target cell.
In this step, the wireless access capability of the target cell may be obtained by querying a target network function entity corresponding to the target cell in the target cell list. When the target network of the target cell is GERAN, the target network functional entity may be a functional entity such as BSC or SGSN that stores the radio access capability of the target cell; when the target network of the target cell is UTRAN, the target network functional entity may be a functional entity such as RNC or NodeB storing the radio access capability of the target cell.
In this step, the radio access capability of the target cell may also be obtained through a measurement report reported by the user equipment, and specifically, the user equipment may obtain the radio access capability of the target cell by reading a system broadcast message sent by a target network where the target cell is located, and then report the radio access capability of the target cell carried by the measurement report.
Step 203: and when a matched cell matched with the wireless access capability of the user equipment exists in the target cell, issuing a CS fallback command containing the identifier of the matched cell to the user equipment.
Wherein the CS fallback command comprises a PS handover command or a NACC command. When the user equipment supports PS switching, the wireless access capability of the matched cell must support PS switching, and a PS switching command containing the identifier of the matched cell is issued to the user equipment; when the user equipment supports NACC, the radio access capability of the matching cell must support NACC, and an NACC command containing the identification of the matching cell is issued to the user equipment.
Further, when the user equipment receives the CS fallback command, it can successfully fallback to the target cell matching the supported radio access capability according to the identifier of the matching cell included in the command.
Fig. 3 shows a flow of a second embodiment of the fallback method based on circuit switching according to the present invention, where both the UE and the eNodeB in this embodiment are located in EUTRAN as a source access network, and a target network where a target cell after the UE performs CS fallback is located is UTRAN or GERAN.
This embodiment shows a detailed flow of CS fallback, in which when matching of radio access capabilities is performed, it is checked by MME whether radio access capabilities of target cell and UE match:
step 301: after UE initiates a CS service call request to eNodeB, or UE as a called party receives a paging message sent by a CS service call, the eNodeB issues a measurement control message to the UE, and the UE triggers a measurement process according to the measurement control message and reports a measurement report containing a measurement result to the eNodeB. Since the source cell to which the UE attaches is located in EUTRAN, the RAT capabilities of the target network and the target cell are not included in the measurement report.
Step 302: and the eNodeB makes a pre-decision after receiving the measurement report, and generates a target cell list, wherein the target cell list comprises at least one target cell.
Step 303: the eNodeB sends a request message to the MME requesting to query the RAT capabilities of all target cells contained in the target cell list.
The request message in this step may specifically be an extended existing message for notifying the MME that the UE needs to perform CS fallback, where an added cell in the extended message carries a request field of the target cell RAT capability.
The request message in this step may also be a new message different from the existing message, where the new message carries the identifier of the target cell and the request field of the RAT capability of the target cell.
The request field of the RAT capability of the target cell indicates that the RAT capability of the target cell in the target cell list needs to be acquired, that is, the MME is requested to query the RAT capability of the target cell. In this embodiment, the MME is required to match the radio access capabilities, so that when the eNodeB sends the request message to the MME, no matter which of the two messages is used, the request message further includes information of the RAT capability that the target cell needs to support, where the RAT capability that the target cell needs to support is the RAT capability of the user equipment, and for example, if the UE supports PS handover, the information of the RAT capability that the target cell needs to support is PS handover.
Step 304: and the MME receives the request message, knows that the eNodeB requests to acquire the RAT capabilities of all the target cells, and sends a query request message to a functional entity storing the RAT capabilities of the target cells in a target network where the target cells are located according to the identification of the target cells.
In this step, when the MME needs to query the RAT capabilities of multiple target cells through the target network functional entity, the MME may implement the query by establishing association with the functional entity. In particular, when there is more than one target cell, the MME may establish multiple associations with multiple functional entities in the target network. Specifically, the MME may establish an association with each functional entity one by one according to a certain order, or may establish an association with each functional entity at the same time.
Specifically, when the target cell belongs to the GERAN network, the functional entity storing the RAT capability of the target cell may be a BSC, an SGSN, or an MSC; when the target cell belongs to the UTRAN network, the functional entity storing the RAT capability of the target cell may be an RNC, NodeB or MSC, etc.
Step 305: after receiving the query request message, the target network functional entity acquires the stored RAT capability of the target cell according to the target cell identifier in the message, and sends a query response message to the MME, wherein the message comprises the identifier of the target cell and the RAT capability corresponding to the identifier of the target cell.
Step 306: in this embodiment, since the eNodeB includes the RAT capability information that the target cell needs to support in the request message sent to the MME, the MME checks whether the RAT capability of the target cell included in the query response message matches the RAT capability information that the target cell needs to support.
If the RAT capability of the target cell contained in the query response message matches the RAT capability information that the target cell needs to support, execute step 307; otherwise, sending a response message of failed query to the eNodeB, and the eNodeB receiving the response message and knowing that the CS fallback can not be normally executed.
Step 307: and the MME sends a response message of successful query to the eNodeB, wherein the response message contains the identification of the matched cell.
If multiple associations are established one by one between the MME and the target network functional entity in step 304, the target network functional entity returns an inquiry response message corresponding to each target cell to the MME one by one, and when the MME performs RAT capability matching, only part of the RAT capabilities of the target cells may be matched with the RAT capabilities that need to be supported, and when at least one matching cell exists, the MME may send a response message that the inquiry is successful to the eNodeB, where the response message includes an identifier of the matching cell. Further, in order to reduce the time consumption for querying the target cell with the matching RAT capability, the MME may reject or ignore the subsequent query response message after receiving the query response message including the matching cell, and may further remove the association established with the target network function entity and send the response message including the successful query of the matching cell identifier to the eNodeB.
If the MME and the target network functional entity establish multiple associations at the same time in step 304, the target network functional entity may return multiple query response messages to the MME at the same time, and the MME may reject or ignore subsequent query response messages, remove the association established with the target network functional entity, and send a response message containing the identifier of the matching cell for successful query to the eNodeB as long as the MME receives one query response message containing the matching cell when performing RAT capability matching.
Step 308: and if a response message of successful query is received, the eNodeB makes a final CS fallback decision. Specifically, the eNodeB determines a target cell for finally performing CS fallback according to the received response message.
It should be noted that, if the MME rejects or ignores the subsequent query response message after receiving the query response message containing the matching cell in step 307, and sends the response message containing the identifier of the matching cell and indicating that the query is successful to the eNodeB, the eNodeB does not need to perform the CS fallback decision, and the matching cell is taken as the target cell for finally performing the CS fallback.
Step 309: and sending a backspacing command containing the identification of the matched cell to the UE, wherein the matched cell is a target cell determined according to the backspacing decision.
Step 310: the UE executes CS fallback according to the fallback command.
The scheme for UE to perform fallback in the prior art is applicable to the embodiments of the present invention, and is not described herein again.
In the second embodiment, since the MME is used to match the radio access capability, the eNodeB may directly receive the identifier of the target cell matched with the RAT capability supported by the UE, and issue the fallback command according to the matched cell, so that the UE may successfully fallback to the matched target cell, thereby reducing the failure rate of CS fallback and improving the reliability of CS fallback and user experience.
The third embodiment of the fallback method based on circuit switching according to the present invention is shown in fig. 4, and this embodiment shows another detailed CS fallback procedure, which is different from the second embodiment in that when the radio access capability is matched, the eNodeB performs a procedure of checking whether the radio access capability of the target cell matches the radio access capability of the UE:
steps 401 to 402 are similar to steps 301 to 302 in the second embodiment, and are not described again.
Step 403: the eNodeB sends a request message to the MME requesting to query the RAT capabilities of all target cells contained in the target cell list.
In this embodiment, the eNodeB performs matching of the radio access capabilities, so the query request message may not include information of the RAT capabilities that the target cell needs to support.
Steps 404 to 405 are similar to steps 304 to 305 in the second embodiment, and are not described herein again.
Step 406: in this embodiment, the request message sent by the eNodeB to the MME does not include RAT capability information that the target cell needs to support, so the MME converts the received query response message into a message format that can be identified by the eNodeB, and sends the message format to the eNodeB.
Step 407: the eNodeB checks whether the RAT capability of the target cell contained in the query response message matches the RAT capability that the target cell needs to support, and if so, performs step 408; otherwise, the CS fallback fails.
When the MME and the target network function entity establish a plurality of associations one by one, the target network function entity also returns an inquiry response message corresponding to each target cell to the MME one by one, and the MME sends the converted response message to the eNodeB one by one, so that when the eNodeB performs RAT capability matching, there may be a case where the RAT capability of a part of target cells matches the RAT capability that needs to be supported, and a part of target cells does not match, but the eNodeB can perform step 408 as long as there is a matching cell. In addition, in order to shorten the time consumption for inquiring the target cell of the matched RAT capability, after the eNodeB is matched with a matched cell corresponding to the needed RAT capability, a response message of successful matching can be sent to the MME, the MME rejects or ignores the subsequent inquiry response message, and the association established with the target network functional entity is removed.
Steps 408 to 410 are similar to steps 308 to 310 in the second embodiment, and are not described herein again.
In the third embodiment, the MME queries the radio access capability of the target cell, and the eNodeB matches the radio access capability, and the eNodeB can directly issue the fallback command to the target cell according to the matching result, so that the UE can successfully fallback to the matched target cell, thereby reducing the failure rate of CS fallback and improving the reliability of CS fallback and user experience.
A fourth embodiment of the fallback method based on circuit switching according to the present invention is shown in fig. 5, which shows a detailed procedure of CS fallback, and is different from the second and third embodiments in that the radio access capability of the target cell is obtained through a system broadcast message sent by the target network in this embodiment:
step 501: after UE initiates a CS service call request to eNodeB, or UE as a called receives a paging message sent by the CS service call, the eNodeB issues a measurement control message to the UE, wherein the measurement control message is used for triggering the UE to carry out a measurement process across a wireless access network.
Step 502: and the UE acquires the RAT capability of the target cell by reading a system broadcast message sent by a target network where the target cell is located. The system broadcast message in this embodiment is a message that is extended based on the existing system broadcast message, and the target network must carry the RAT capability of the extended target cell when broadcasting the message.
Step 503: and the UE puts the read RAT capability of the target cell into a measurement report and reports the measurement report to the eNodeB.
Step 504: and after reading the RAT capability of the target cell in the received measurement report, the eNodeB acquires the target cell matched with the RAT capability which needs to be supported by the UE.
Step 505: the eNodeB triggers a final CS fallback decision, i.e. determines a target cell for CS fallback from the matched target cells.
Step 506: and sending a back-off command containing the target cell identification to the UE.
Step 507: the UE executes CS fallback according to the fallback command.
Compared with the second embodiment and the third embodiment, the fourth embodiment does not need to acquire the radio access capability of the target cell through the MME, and the UE can acquire the radio access capability of the target cell by reading the extended system broadcast message.
Corresponding to the embodiment of the fallback method based on circuit switching, the invention also provides an embodiment of the fallback system based on circuit switching.
Fig. 6 is a block diagram of a first embodiment of a fallback system based on circuit switching according to the present invention, which includes: a base station 610, an MME620 and a user equipment 630.
After receiving the CS call request, the base station 610 sends a request message for acquiring the radio access capability of the target cell to the MME 620; the MME620 receives the request message, matches the radio access capability of the target cell with the radio access capability of the user equipment, and sends the identifier of the matching cell matched with the radio access capability of the user equipment to the base station 610; the base station 610 sends a CS fallback command to the user equipment 630, where the CS fallback command carries the identifier of the matching cell matching the radio access capability of the user equipment; the user equipment 630 performs fallback according to the CS fallback command.
As the same entities included in the block diagram of the first embodiment, another embodiment of the fallback system based on circuit switching according to the present invention also includes a base station, an MME and a user equipment.
The base station receives a CS call request and sends a request message for acquiring the wireless access capability of a target cell to the MME; the MME receives the request message and sends the acquired wireless access capability of the target cell to the base station; the base station receives the request message and sends the acquired wireless access capability of the target cell to the base station; and the user equipment executes the backspacing according to the CS backspacing command.
Fig. 7 is a block diagram of another embodiment of a circuit-switching based fallback system of the present invention, which includes: a base station 710 and a user equipment 720.
Wherein, the base station 710 receives the CS call request and sends a measurement control message to the user equipment 720; the ue 720 receives the measurement control message, obtains the radio access capability of the target cell by reading a system broadcast message sent by a target network where the target cell is located, and sends a measurement report to the base station, where the measurement report includes the radio access capability of the target cell; the base station 710 receives a measurement report, and when the radio access capability of a target cell in the measurement report matches with the radio access capability supported by the user equipment 720, sends a CS fallback command to the user equipment 720, where the CS fallback command carries an identifier of a matching cell; the user equipment 720 performs fallback according to the CS fallback command.
Corresponding to the embodiments of the fallback method and system based on circuit switching of the present invention, the present invention further provides embodiments of an access network device and a core network device, where the access network device is usually a base station, and the core network device is usually an MME.
Fig. 8 shows a block diagram of a first embodiment of an access network device according to the present invention, where the access network device includes: an acquisition unit 810 and a transmission unit 820.
The obtaining unit 810 is configured to receive a CS call request based on circuit switching, and obtain a radio access capability of a target cell; the sending unit 820 is configured to, when there is a matching cell matching the radio access capability of the user equipment in the target cell, issue a CS fallback command including an identifier of the matching cell to the user equipment.
Fig. 9 is a block diagram of a second embodiment of an access network device according to the present invention, where the access network device includes: an acquisition unit 910 and a transmission unit 920.
The obtaining unit 910 includes: a list generating unit 911, configured to generate a target cell list including at least one target cell according to the measurement report reported by the ue; an inquiry obtaining unit 912, configured to obtain the radio access capability of the target cell by inquiring a target network function entity corresponding to the target cell in the target cell list.
Specifically, the query obtaining unit 912 further includes: a request sending unit 9121, configured to send a request message to a mobility management entity MME, where the request message includes an identifier of the target cell, a request field of a target cell radio access capability, and a radio access capability that the target cell needs to support, where the radio access capability that the target cell needs to support is a radio access capability of the user equipment; a result reading unit 9122, configured to read an identifier of a matching cell that matches the radio access capability of the user equipment and is carried in the response message sent by the MME, and a corresponding radio access capability thereof.
The sending unit 920 is configured to, when there is a matching cell matching the radio access capability of the user equipment in the target cell, issue a CS fallback command including an identifier of the matching cell to the user equipment.
Fig. 10 is a block diagram of a third embodiment of an access network device according to the present invention, where the access network device includes: an acquisition unit 1010 and a transmission unit 1020.
Wherein the obtaining unit 1010 includes: a list generating unit 1011, configured to generate a target cell list including at least one target cell according to the measurement report reported by the ue; an inquiry obtaining unit 1012, configured to obtain the radio access capability of the target cell by inquiring a target network function entity corresponding to the target cell in the target cell list.
Specifically, the query obtaining unit 1012 further includes: a request sending unit 10121, configured to send a request message to an MME, where the request message includes an identifier of the target cell and a request field of a target cell radio access capability; a result reading unit 10122, configured to read the radio access capability of the target cell carried in the response message sent by the MME; a cell matching unit 10123, configured to check whether the radio access capability of the target cell matches the radio access capability of the user equipment.
The sending unit 1020 is configured to, when there is a matching cell matching the radio access capability of the user equipment in the target cell, issue a CS fallback command including an identifier of the matching cell to the user equipment.
Fig. 11 is a block diagram of a fourth embodiment of an access network device according to the present invention, where the access network device includes: an acquisition unit 1110 and a transmission unit 1120.
Wherein, the obtaining unit 1110 includes: a message issuing unit 1111, configured to issue a measurement control message to a user equipment, where the measurement control message is used to trigger the user equipment to read a system broadcast message carrying the wireless access capability of the target cell; a message reading unit 1112, configured to read the radio access capability of the target cell carried in the measurement message reported by the ue.
The sending unit 1120 is configured to, when there is a matching cell matching the radio access capability of the user equipment in the target cell, issue a CS fallback command including an identifier of the matching cell to the user equipment.
Fig. 12 shows a block diagram of an embodiment of a core network device of the present invention, where the core network device includes: a receiving unit 1210, a querying unit 1220 and a sending unit 1230.
The receiving unit 1210 is configured to trigger the querying unit 1220 after receiving the identifier of the target cell, and receive the radio access capability corresponding to the identifier of the target cell and trigger the sending unit 1230; the querying unit 1220 is configured to send a query request message carrying the identifier of the target cell after receiving the trigger of the receiving unit 1210; the sending unit 1230 is configured to send the radio access capability corresponding to the identifier of the target cell after receiving the trigger of the receiving unit 1210.
Further, the receiving unit 1210 is further configured to receive a radio access capability that needs to be supported by the target cell; the sending unit 1230 is further configured to send the identity of the target cell. The receiving unit 1210 further includes a matching subunit (not shown in the figure) configured to check whether the radio access capability corresponding to the received identifier of the target cell matches the radio access capability that needs to be supported by the target cell, and if so, execute the trigger sending unit 1230.
It should be noted that, although the foregoing embodiment of the present invention mainly describes the CS fallback procedure by taking the CS voice service as an example, the embodiment of the present invention does not limit the supported CS service, that is, the embodiment of the present invention may also be applied to other CS services such as short message SMS/multimedia message MMS service, location service LCS, and the like.
It can be known from the description of the embodiment of the present invention that, when the embodiment of the present invention is applied to CS fallback, due to the fact that the related information (such as the wireless access capability, etc.) of the target cell is obtained in advance, the target cell matched with the supported wireless access capability can be specifically issued to the user equipment when a fallback command is issued, and the user equipment can successfully fallback to the matched target cell, thereby reducing the failure rate of CS fallback, and improving the reliability of CS fallback and user experience. It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, where the program may be stored in a computer readable storage medium, and when executed, the program includes the following steps: after the incoming call is connected, the connection module provides the client identification to a service module which is separately arranged with the connection module; the connection module executes the connection control function, and the service module executes the service processing function according to the client identifier. The storage medium, such as: ROM/RAM, magnetic disk, optical disk, etc.
While the present invention has been described with respect to the embodiments, those skilled in the art will appreciate that there are numerous variations and permutations of the present invention without departing from the spirit of the invention, and it is intended that the appended claims cover such variations and modifications as fall within the true spirit of the invention.
Claims (16)
1. A circuit-switched based fallback method, comprising:
receiving a circuit-switched based CS call request;
acquiring the wireless access capability of a target cell;
and when a matched cell matched with the wireless access capability of the user equipment exists in the target cell, issuing a CS fallback command containing the identifier of the matched cell to the user equipment.
2. The method of claim 1,
acquiring the wireless access capability of a target cell by inquiring a target network functional entity corresponding to the target cell; or,
and acquiring the wireless access capability of the target cell through the measurement message reported by the user equipment.
3. The method of claim 2, wherein the acquiring the radio access capability of the target cell by querying a target network function entity corresponding to the target cell comprises:
generating a target cell list at least comprising one target cell according to the measurement report reported by the user equipment;
and acquiring the wireless access capability of the target cell by inquiring a target network functional entity corresponding to the target cell in the target cell list.
4. The method of claim 3, wherein the obtaining the radio access capability of the target cell by querying a target network function entity corresponding to the target cell in the target cell list comprises:
sending a request message to a Mobility Management Entity (MME), wherein the request message comprises an identifier of the target cell, a request field of the wireless access capability of the target cell and the wireless access capability required to be supported by the target cell, and the wireless access capability required to be supported by the target cell is the wireless access capability of the user equipment;
and reading the identifier of the matched cell matched with the wireless access capability of the user equipment and the corresponding wireless access capability carried in the response message sent by the MME.
5. The method of claim 4, wherein the process of obtaining the radio access capability of the target cell by querying a target network function entity corresponding to the target cell in the target cell list further comprises:
the MME receives the request message and sends a query request message to a target network function entity storing the wireless access capability of the target cell according to the request message;
and the MME receives an inquiry response message returned by the target network functional entity, checks whether the wireless access capability of the target cell contained in the inquiry response message is matched with the wireless access capability required to be supported by the target cell, and sends the response message, wherein the response message carries the identifier of the matched cell matched with the wireless access capability required to be supported and the corresponding wireless access capability.
6. The method of claim 3, wherein obtaining the radio access capability of the target cell by querying a target network function entity corresponding to the target cell in the target cell list comprises:
sending a request message to MME, wherein the request message comprises the identification of the target cell and a request field of the wireless access capability of the target cell;
reading the wireless access capability of the target cell carried by the response message sent by the MME;
checking whether the wireless access capability of the target cell is matched with the wireless access capability of the user equipment.
7. The method of claim 6, wherein the step of obtaining the radio access capability of the target cell by querying a target network function entity corresponding to the target cell in the target cell list further comprises:
the MME receives the request message and sends a query request message to a target network function entity storing the wireless access capability of the target cell according to the request message;
and the MME receives an inquiry response message returned by the target network functional entity, wherein the inquiry response message carries the identification of the target cell and the corresponding wireless access capability.
8. The method of claim 2, wherein the obtaining the radio access capability of the target cell through the measurement message reported by the ue comprises:
sending a measurement control message to user equipment, wherein the measurement control message is used for triggering the user equipment to read a system broadcast message carrying the wireless access capability of the target cell;
and reading the wireless access capability of the target cell carried by the measurement message reported by the user equipment.
9. A circuit-switched based fallback system, comprising: a base station, a mobility management entity MME and user equipment,
the base station includes:
the system comprises an acquisition unit, a base station and a base station, wherein the acquisition unit is used for receiving a CS calling request based on circuit switching and acquiring the wireless access capability of a target cell;
a sending unit, configured to issue a CS fallback command including an identifier of a matching cell to a user equipment when the matching cell matching a radio access capability of the user equipment exists in the target cell; wherein,
the acquisition unit includes:
a list generating unit, configured to generate a target cell list including at least one target cell according to the measurement report reported by the ue;
the query acquisition unit is used for acquiring the wireless access capability of the target cell by querying a target network functional entity corresponding to the target cell in the target cell list; the query acquisition unit includes:
a request sending unit, configured to send a request message to a mobility management entity MME, where the request message includes an identifier of the target cell, a request field of a target cell radio access capability, and a radio access capability that the target cell needs to support, and the radio access capability that the target cell needs to support is a radio access capability of the user equipment;
a result reading unit, configured to read an identifier of a matching cell that is carried in a response message sent by the MME and matches the radio access capability of the user equipment, and a corresponding radio access capability of the matching cell;
the MME is used for receiving the request message, matching the wireless access capability of the target cell with the wireless access capability of user equipment, and sending the identifier of the matched cell matched with the wireless access capability of the user equipment to the base station;
and the user equipment is used for executing rollback according to the CS rollback command.
10. A circuit-switched based fallback system, comprising: a base station, a mobility management entity MME and user equipment,
the base station includes:
the system comprises an acquisition unit, a base station and a base station, wherein the acquisition unit is used for receiving a CS calling request based on circuit switching and acquiring the wireless access capability of a target cell;
a sending unit, configured to issue a CS fallback command including an identifier of a matching cell to a user equipment when the matching cell matching a radio access capability of the user equipment exists in the target cell; wherein,
the acquisition unit includes:
a list generating unit, configured to generate a target cell list including at least one target cell according to the measurement report reported by the ue;
the query acquisition unit is used for acquiring the wireless access capability of the target cell by querying a target network functional entity corresponding to the target cell in the target cell list; the query acquisition unit includes:
a request sending unit, configured to send a request message to an MME, where the request message includes an identifier of the target cell and a request field of a target cell radio access capability;
a result reading unit, configured to read the radio access capability of the target cell carried in the response message sent by the MME;
a cell matching unit, configured to check whether the radio access capability of the target cell matches the radio access capability of the user equipment;
the MME is used for receiving the request message and sending the acquired wireless access capability of the target cell to the base station;
and the user equipment is used for executing rollback according to the CS rollback command.
11. A circuit-switched based fallback system, comprising: a base station and a User Equipment (UE),
the base station includes:
the system comprises an acquisition unit, a base station and a base station, wherein the acquisition unit is used for receiving a CS calling request based on circuit switching and acquiring the wireless access capability of a target cell;
a sending unit, configured to issue a CS fallback command including an identifier of a matching cell to a user equipment when the matching cell matching a radio access capability of the user equipment exists in the target cell; wherein,
the acquisition unit includes:
a message issuing unit, configured to issue a measurement control message to a user equipment, where the measurement control message is used to trigger the user equipment to read a system broadcast message carrying the wireless access capability of the target cell;
a message reading unit, configured to read the radio access capability of the target cell carried in the measurement message reported by the user equipment;
the user equipment is configured to receive the measurement control message, acquire the radio access capability of the target cell by reading a system broadcast message sent by a target network where the target cell is located, send a measurement report to the base station, where the measurement report includes the radio access capability of the target cell, and execute fallback according to the CS fallback command.
12. An access network device, comprising:
the system comprises an acquisition unit, a base station and a base station, wherein the acquisition unit is used for receiving a CS calling request based on circuit switching and acquiring the wireless access capability of a target cell;
a sending unit, configured to issue a CS fallback command including an identifier of a matching cell to the user equipment when the matching cell matching the radio access capability of the user equipment exists in the target cell.
13. The apparatus of claim 12, wherein the obtaining unit comprises:
a list generating unit, configured to generate a target cell list including at least one target cell according to the measurement report reported by the ue;
and the query acquisition unit is used for acquiring the wireless access capability of the target cell by querying a target network function entity corresponding to the target cell in the target cell list.
14. The apparatus of claim 13, wherein the query obtaining unit comprises:
a request sending unit, configured to send a request message to a mobility management entity MME, where the request message includes an identifier of the target cell, a request field of a target cell radio access capability, and a radio access capability that the target cell needs to support, and the radio access capability that the target cell needs to support is a radio access capability of the user equipment;
and a result reading unit, configured to read an identifier of a matching cell that is matched with the radio access capability of the user equipment and is carried in the response message sent by the MME, and a corresponding radio access capability of the matching cell.
15. The apparatus of claim 13, wherein the query obtaining unit comprises:
a request sending unit, configured to send a request message to an MME, where the request message includes an identifier of the target cell and a request field of a target cell radio access capability;
a result reading unit, configured to read the radio access capability of the target cell carried in the response message sent by the MME;
a cell matching unit, configured to check whether the radio access capability of the target cell matches the radio access capability of the user equipment.
16. The apparatus of claim 12, wherein the obtaining unit comprises:
a message issuing unit, configured to issue a measurement control message to a user equipment, where the measurement control message is used to trigger the user equipment to read a system broadcast message carrying the wireless access capability of the target cell;
and the message reading unit is used for reading the wireless access capability of the target cell carried by the measurement message reported by the user equipment.
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| CN2008101333124A CN101631352B (en) | 2008-07-15 | 2008-07-15 | Rollback method, rollback system, access network equipment and core network equipment based on circuit switching |
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| CN2008101333124A CN101631352B (en) | 2008-07-15 | 2008-07-15 | Rollback method, rollback system, access network equipment and core network equipment based on circuit switching |
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| CN105230083B (en) * | 2013-05-21 | 2019-04-30 | 三星电子株式会社 | The method and apparatus for selecting the cell in mobile communications network |
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| US8600390B2 (en) * | 2010-02-02 | 2013-12-03 | Telefonaktiebolet L M Ericsson (publ) | Returning user equipment to a source radio access network |
| US9699718B2 (en) * | 2010-04-12 | 2017-07-04 | Qualcomm Incorporated | System, apparatus, and method to enable domain selection in a multimode device |
| US20110312321A1 (en) * | 2010-06-22 | 2011-12-22 | Qualcomm Incorporated | System, apparatus, and method for improving circuit switched fallback call setup delay in wireless communication systems |
| PL2625921T3 (en) * | 2010-10-05 | 2018-01-31 | Ericsson Telefon Ab L M | Technique for connection attempt handling in a circuit switched fallback situation |
| CN103379557B (en) * | 2012-04-13 | 2016-10-05 | 华为技术有限公司 | Ability matching process, access network control node and user equipment |
| WO2014179987A1 (en) * | 2013-05-10 | 2014-11-13 | 华为技术有限公司 | Cell selection method, user equipment, and base station |
| CN103702393B (en) * | 2013-12-17 | 2017-02-08 | 中国联合网络通信集团有限公司 | CSFB (Circuit Switched Fallback) network switching method, MME (Mobile Management Entity) and base station |
| EP2989826A4 (en) | 2014-03-21 | 2017-04-19 | MediaTek Singapore Pte Ltd. | Cell selection and reselection for low cost machine-type communication ue |
| CN111770554B (en) * | 2019-03-30 | 2022-04-22 | 成都华为技术有限公司 | Network access method and device |
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