CN101370261A - Resource preparation method and communication equipment for switching from CS field to PS field - Google Patents
Resource preparation method and communication equipment for switching from CS field to PS field Download PDFInfo
- Publication number
- CN101370261A CN101370261A CNA2007101405861A CN200710140586A CN101370261A CN 101370261 A CN101370261 A CN 101370261A CN A2007101405861 A CNA2007101405861 A CN A2007101405861A CN 200710140586 A CN200710140586 A CN 200710140586A CN 101370261 A CN101370261 A CN 101370261A
- Authority
- CN
- China
- Prior art keywords
- address
- target
- domain
- voice
- access gateway
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004891 communication Methods 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims description 34
- 102000018059 CS domains Human genes 0.000 claims abstract description 77
- 108050007176 CS domains Proteins 0.000 claims abstract description 77
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000012545 processing Methods 0.000 claims description 8
- 238000010295 mobile communication Methods 0.000 claims description 7
- 230000000977 initiatory effect Effects 0.000 claims description 5
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 230000011664 signaling Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- GVVPGTZRZFNKDS-JXMROGBWSA-N geranyl diphosphate Chemical compound CC(C)=CCC\C(C)=C\CO[P@](O)(=O)OP(O)(O)=O GVVPGTZRZFNKDS-JXMROGBWSA-N 0.000 description 1
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The embodiment of the invention provides a resource preparing method of switching from a CS domain to a PS domain, including: when user equipment (UE) needs to be switched to a packet switching (PS) domain from a circuit switching (CS) domain, sending the requirements of requiring to obtain the needed IP address when the UE is switched to the PS domain, and requiring the IP address from the target access gateway according to the received requirements by the target mobile management entity; receiving the IP address sent by the target mobile management entity. The embodiment of the invention further provides a communication device. The technical proposal provided by the embodiment of the invention is the resource preparing for the UE switching from the CS domain to the PS domain, thereby being capable of implementing the UE switching from the CS domain to the PS domain, guaranteeing the continuity of the user's voice service in the switching process, and enhancing the user experience.
Description
Technical Field
The present invention relates to the field of mobile communication technologies, and in particular, to a resource preparation method for switching a User Equipment (UE) from a Circuit Switched (CS) domain to a Packet Switched (PS) domain, and a communication device.
Background
The third Generation Partnership Project (3 GPP), in its R7(Release 7) version, proposes a Voice Call Continuity (VCC) technique for implementing fixed mobile network convergence to implement the conversion of Voice calls between the CS System and the IMS System of the 3GPP, such as an Evolved Packet System (EPS). The 3GPP proposes VCC technology, and mainly aims to solve the coverage and handover problems of the mobile communication system and the Wireless Local Area Network (WLAN). The implementation of VCC requires that the UE has the capability of accessing the mobile communication system and the WLAN simultaneously, and the UE with the capability is referred to as VCC UE.
However, since the UE does not support simultaneous access to different mobile communication systems, such as a 2G system and a 3G system, in order to ensure the voice call continuity when the voice service of the user is switched from the CS domain to the PS domain, the 3GPP proposes a single access VCC (SR VCC) technology in its R8 version, so as to expect that the voice call continuity of the UE can be still ensured when the UE is switched from the CS domain to the PS domain, such as from the CS domain of the 2G system to the PS domain of the EPS, or from the CS domain of the 3G system to the PS domain of the EPS system.
However, in the prior art, the SR VCC technology is also a few assumptions, and no specific solution is given in R8 for how to specifically implement the handover, e.g., how to prepare for the resources required for the handover of the UE from the CS domain to the PS domain.
Disclosure of Invention
The embodiment of the invention provides a resource preparation method for switching from a CS domain to a PS domain, which can prepare switching resources for switching UE from the CS domain to the PS domain.
A resource preparation method for switching from a CS domain to a PS domain comprises the following steps:
when User Equipment (UE) needs to be switched from a Circuit Switching (CS) domain to a Packet Switching (PS) domain, sending a request for acquiring an IP address required by switching the UE to the PS domain to a target mobile management entity, and requesting the IP address from a target access gateway by the target mobile management entity according to the received request;
receiving the IP address sent by the target mobile management entity.
An embodiment of the present invention further provides a communication device, configured to control handover from a CS domain to a PS domain, including: a transmitting unit and a receiving unit; wherein,
a sending unit, configured to send a request for acquiring an IP address required for the UE to switch to the PS domain to a target mobility management entity;
a receiving unit, configured to receive the IP address sent by the target mobility management entity.
An embodiment of the present invention further provides another communication device, configured to perform mobility management in mobile communication, where the communication device includes: the device comprises a request receiving unit, a processing unit and an address sending unit;
a request receiving unit, configured to receive a request for applying a target access gateway for an IP address required for the UE to switch to the PS domain;
the processing unit is used for applying for the IP address to a target access gateway and receiving the IP address returned by the target access gateway;
and the address sending unit is used for sending out the IP address.
In the technical solution provided by the embodiment of the present invention, the target mobility management entity obtains, from the target access gateway, the IP address required for the UE to switch from the CS domain to the PS domain, and performs resource preparation for the UE to switch from the CS domain to the PS domain, so that the UE can be switched from the CS domain to the PS domain, thereby ensuring continuity of the voice service of the user during the switching process and improving user experience.
Drawings
FIG. 1 is a flowchart of a resource preparation method for handover of a UE from a CS domain to a PS domain according to an embodiment of the present invention;
FIG. 2a is a flow chart of a preparation process before a UE is handed over from a CS domain to a PS domain according to a first embodiment of the present invention;
FIG. 2b is a flowchart illustrating a handover of a UE from a CS domain to a PS domain in the first embodiment;
FIG. 3 is a flow chart of a preparation process before a UE switches from a CS domain to a PS domain according to a fourth embodiment of the present invention;
FIG. 4a is a flow chart of preparation before the UE switches from the CS domain to the PS domain according to the fifth embodiment of the present invention;
FIG. 4b is a signaling flow diagram illustrating a UE handover from a CS domain to a PS domain according to a fifth embodiment;
fig. 5 is a handover flow diagram of an existing UE from a PS domain of 3G to an EPS network;
FIG. 6 is a schematic diagram of an ICCC channel between existing IMS and CS domains;
fig. 7 is a schematic structural diagram of a communication device 700 in an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a communication device 800 in an embodiment of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention are further described in detail below with reference to the accompanying drawings.
The embodiment of the invention provides a resource preparation scheme for switching UE from a CS domain to a PS domain, and the resource preparation can comprise the step of acquiring an IP address of the PS domain for the UE. Wherein, an intermediate network element can be set for realizing the signaling adaptation between the PS domain and the CS domain. In the embodiment of the present invention, if the UE is switched from the CS domain to the PS domain under the control of the CS, the intermediate network element may be a Mobile Switching Center (MSC) on the target side, which is called an eMSC; if the handover is performed under the Control of the IMS, the intermediate network element may be a PS and CS handover Control Function (PCHCF, PS-CSHandover Control Function).
Referring to fig. 1, fig. 1 is a flowchart of a resource preparation method for handover of a UE from a CS domain to a PS domain according to an embodiment of the present invention, where the flowchart may include the following steps:
step 101, when user equipment UE needs to switch from circuit switched CS domain to packet switched PS domain, the intermediate network element sends a request for acquiring an IP address required for switching the UE to PS domain to a target Mobility Management Entity (MME), and the target Mobility management entity requests the IP address from a target access gateway according to the received request.
And 102, the intermediate network element receives the IP address sent by the target mobile management entity.
In the following, taking an example that the handover of the UE from the CS domain to the PS domain is performed under the CS control, how to perform resource preparation for the UE from the CS domain to the PS domain in the embodiment of the present invention is described in detail, including acquiring an IP address required for the handover of the UE from the CS domain to the PS domain.
The first embodiment is as follows:
referring to fig. 2a, fig. 2a is a flowchart of preparation before a UE switches from a CS domain to a PS domain according to a first embodiment of the present invention, where the process includes the following steps:
step 201, the UE notifies the source BSS of the measurement report of the neighboring cell, and the source BSS determines to initiate a handover procedure according to the cell measurement report.
Step 202, the source BSS sends a handover request (HO Required) message to the source MSC.
The HO Required Message carries information such as a Message Type (Message Type), a handover reason (Cause), a Cell Identifier List (Cell Identifier List), and the like.
Step 203, after receiving the HO Required message, the source MSC initiates inter-office Handover according to the target cell identifier, and sends a Handover preparation request (MAP-Prep-Handover req) message to the eMSC.
The MAP-Prep-Handover req message carries Information such as transaction Id, Target Cell Id, session routing Number (HO Number), International Mobile Subscriber Identity (IMSI), Integrity Protection Information (Integrity Protection Information), and Encryption Information (Encryption Information). The message is primarily to notify the eMSC to do target side resource preparation.
Step 204, the eMSC determines that the voice call needs to be switched from the CS domain to the PS domain according to the target cell identifier, configures a special Access Point (APN) according to the user service characteristics, the requirement and other configuration information, and brings the APN to the target MME through a Forward relocation request (Forward relocation request) message.
In the embodiment of the invention, the eMSC instructs the target MME to apply for the IP address required by the UE switching to the PS domain from the target access gateway through a Forward Relocation Request message, and the message carries the APN serving as the IP address application instruction information. Because the APN and the address of the target access gateway have a corresponding relation, after the target MME receives the Forward Relocation Request message, the corresponding target access gateway can be found according to the special APN in the Forward Relocation Request message.
In addition, the Forward location Request message may also carry information such as a target cell identifier, a target base station identifier, and an IMSI, in addition to the APN parameter.
Step 205, after receiving the Forward location Request message, the MME finds a corresponding target access gateway according to a dedicated APN therein, and sends a Request (Create Bearer Context Request) message for establishing a default Bearer Context to the target access gateway; and the target access gateway returns the IP address allocated for the UE to the target MME by establishing a Default Bearer Response (Create Default Bearer Response) message.
In the embodiment of the present invention, the target access Gateway may be a packet data Gateway (PDN GW), or a combination of the PDN GW and the Serving GW. The PDN GW has a function of allocating an IP address. In the embodiment of the invention, after an MME finds a corresponding PDN GW according to the corresponding relation between the APN and the PDNGW, the MME requests the PDN GW to allocate an IP address of a PS domain for UE by sending a CreateBearer Context Request message to the PDN GW. In addition, the Create Bearer Context Request message carries information such as IMSI and MME Context id of the UE.
In step 206, the MME sends a Forward relocation request response (Forward relocation response) message to the eMSC, where the message carries information of the IP address and the port number of the PS domain allocated to the UE.
So far, the intermediate network element acquires the IP address required for the UE to be switched from the CS domain to the PS domain. The intermediate network element then needs to further prepare the UE for the voice-specific bearer it needs to place the voice call in the PS domain.
Step 207, the eMSC sends a MAP-Prep-Handover rsp message to the source MSC. The message carries information such as Invoke Id, Handover Number, selected UMTS Algorithms (selected UMTS Algorithms), selected Radio resource information (Chosen Radio resource information), and the like.
Step 208, the source MSC sends an Initial Address Message (IAM) message to the eMSC, where the IAM message carries User Service information (User Service information) in addition to information such as a Destination signaling Point Code (DPC), a Destination signaling Point Code (OPC), a Service indication (Service Code), and the like. The User service information source includes information such as a service type and a service bandwidth, wherein the service type may correspond to a quality of service type identifier (QCI, QoS Class identifier) in QoS.
Step 209, the eMSC sends an address Request (add Request) message to the target MGW to Request the address information of the target MGW; the target MGW informs the eMSC of its IP address and port number via an address Response (add Response) message.
The step is used for switching into the PS domain for the UE, and requesting and acquiring the information of the uplink channel of the UE in the target cell.
Steps 210 to 217, the eMSC, as an application Function entity (AF), requests a Policy and Charging Function (PCRF) to establish Policy Control and Charging (PCC) Rules for the dedicated voice bearer, and instructs the PDN GW to establish the voice dedicated bearer between the target base station (eNB) and the PDN GW to be used after the UE is switched to the PS domain. The method comprises the following steps: eMSC sends Application Request (Application Request) message to PCRF, the message carries user service information and IMSI of UE, and requests PCC rule to PCRF through the message; the PCRF returns the PCC rule to the PDN GW through a PCC Provision (PCC Provision) message according to the user service information; after receiving the PCC rule, the PDN GW sends a Dedicated bearer establishment Request (dedicate bearer Request) message to the target MME; after receiving the dedicated bearer establishment Request message, the target MME packs the IP address, the default bearer and the dedicated bearer in a Relocation Request (Relocation Request) message and informs the eNB of establishing the bearer; the eNB returns a Relocation Request acknowledgement (Relocation Request Acknowledge) message, which indicates that the voice special bearing is successfully established; the target MME returns a response (decrypted bearer response) message of the special bearer establishment request to the PDN GW to inform the PDN SGW of the downlink tunnel information, and the target MME can inform the PDN SGW of the downlink tunnel information by using a plurality of pieces of response messages; the PDN SGW returns a Pcc provisionAck message to the PCRF; and after receiving the Pcc Provision Ack message, the PCRF returns an Application Ack message to the eMSC.
In the foregoing step, in the Relocation Request sent by the target MME to the eNB, the IP address allocated to the UE and the parameter related to the dedicated voice bearer established on the PDN GW may be carried, and after the dedicated voice bearer is successfully established, in step 224 of this embodiment one, the eNB may use the IP address of the UE in the PS domain and the parameter related to the dedicated voice bearer, where the steps include: and establishing voice special bearer related parameters on the PDN GW and establishing voice special bearer related parameters on the eNB, and bringing the parameters to the UE. If the target MME does not carry the IP address and the related parameters of the special voice bearer established on the PDN GW to the eNB through the RelocationRequest message, the MME sends an NAS message to carry the IP address and the related parameters of the special voice bearer to the UE after the UE is switched to the target cell.
Step 218, the eMSC sends a modification Request (Mod Request) message to the target MGW to inform the target MGW of the UE IP address and the port number; the target MGW returns a modification response (ModResponse) message to the eMSC.
Step 219, the eMSC sends an Address Complete Message (ACM) message to notify the source MSC that the target side resource preparation is completed.
Referring to fig. 2b, fig. 2b is a flowchart illustrating handover of a UE from a CS domain to a PS domain in the first embodiment. The process may include the steps of:
in steps 220 to 221, the source MSC sends a handover Command (HO Command) to the source BSS, and the source BSS sends the HO Command to the UE.
Step 222, the UE is switched to the target cell of the PS domain from the CS domain.
Step 223, the UE sends a Handover Detect (Handover Detect) message to the target eNB to notify the target eNB that it has accessed the target cell.
Step 224, the eNB brings the IP address of the UE in the PS domain and the voice specific bearer related parameters to the UE through an RRC message Eutran mobility information message.
Step 225 to step 232, after the UE accesses the target cell, the source side is notified to release the resource.
The handover procedure shown in fig. 2b may be performed based on the existing inter-cell handover related signaling procedure, which is not described in detail.
To this end, in this embodiment, the first step completes resource preparation required for the UE to switch from the CS domain to the PS domain, establishes the voice specific bearer of the UE in the PS domain, and notifies the UE of the IP address of the UE in the PS domain and the parameters related to the voice specific bearer; the handover of the UE from the CS domain to the PS domain is realized.
Example two:
the difference between this second embodiment and the first embodiment is that the eMSC indicates that the target MME applies for the IP address required for the UE to switch to the PS domain from the target access gateway in a different manner. Still referring to fig. 2a and 2b, the second embodiment of the present invention for implementing the handover of the UE from the CS domain to the PS domain includes the following steps:
the flow of steps 301 to 303 is the same as the flow of steps 201 to 203.
Step 304, the eMSC determines that the voice service of the UE in the CS domain needs to be switched to the PS domain, configures a CS voice indicator (CS voice indicator) according to the configuration information such as the user service characteristics and requirements, and brings the CS voice indicator to the target MME through a Forward Relocation Request (Forward Relocation Request) message.
That is, the IP address application indication information carried in the Forward location Request message is not an APN, but a CS voice indicator.
Step 305, the target MME may directly configure the address of the PGW according to the CS voice indicator, or configure a dedicated APN first, then find the corresponding PGW address according to the APN, and apply for the IP address required by the UE to the PGW.
The flow of steps 306 to 330 may be the same as the flow of steps 206 to 230 described above.
To this end, in the second embodiment, resource preparation is performed for the UE to switch from the CS domain to the PS domain, so as to implement the handover of the voice call service of the UE from the CS domain to the PS domain.
Example three:
a difference between the third embodiment and the first and second embodiments is also that the eMSC instructs the target MME to apply the target access gateway for the IP address required for the UE to handover to the PS domain. Still referring to fig. 2a and fig. 2b, the second embodiment of the present invention for implementing the handover of the UE from the CS domain to the PS domain includes the following steps:
the flow of steps 401 to 403 is the same as the flow of steps 201 to 203.
Step 404, the eMSC determines that the call is a voice call in a tangential PS domain, configures an address of the PDN GW according to configuration information such as user service features and requirements, and sends the address of the PDN GW to the target MME through a ForwardRelocation Request message.
The IP address application indication information carried in the Forward Relocation Request message is not an APN, is not a CS voice indicator, but is directly an address of a PDN GW.
Step 405, the target MME may directly find a corresponding PGW address according to the obtained address of the PDN PGW, and apply for the IP address required by the UE to the PGW.
The flow of steps 406 to 430 may be the same as the flow of steps 206 to 230 described above.
To this end, in the third embodiment, resource preparation is performed for the UE to switch from the CS domain to the PS domain, so as to implement the handover of the voice call service of the UE from the CS domain to the PS domain.
Example four:
in the first to third embodiments, the intermediate network element is used as the AF to instruct the PDN GW to complete the establishment of the voice dedicated bearer. In the fourth embodiment, the establishment of the voice-specific bearer is completed by the target MME instructing the PDN GW.
Referring to fig. 3, fig. 3 is a flow chart of preparation before the UE switches from the CS domain to the PS domain in the fourth embodiment of the present invention, where the flow chart may include the following steps:
the flow of steps 501 to 502 may be the same as the flow of steps 201 to 202 described above.
Step 503, after receiving the HO Required message, the source MSC initiates inter-office Handover according to the target cell identifier, and sends a MAP-Prep-Handover req message to the eMSC.
In the fourth embodiment, a cell, that is, a User Service information, needs to be added to the MAP-Prep-Handover req message sent by the source MSC to the eMSC.
Step 504, after receiving the MAP-Prep-Handover req message, the eMSC determines that the voice call needs to be switched from the CS domain to the PS domain according to the target cell identifier therein, and issues an IP address application indication message to the target MME through a ForwardRelocation Request message, where the IP address application indication message may be a dedicated APN, a CS voice indicator, or an address of a PDN GW; and the eMSC brings the User Service information to the target MME through the MAP-Prep-Handover req message.
And 505, the target MME applies for the IP address of the UE in the PS domain from the PDNGW by adopting a corresponding method according to the IP address application indication information, and the PDN GW returns an IP address to the target MME.
Step 506, the target MME brings User Service information to the PDN GW through a Dedicated bearersesetup Request message, instructing the PDN GW to establish a Dedicated voice bearer.
Step 507 to step 508, after receiving the dedicate bearerequest message sent by the target MME, the PDN GW sending a PCC Rule Request (PCC Rule Request) message to the PCRF, and bringing User Service information to the PCRF through the PCC Rule Request message; and the PCRF returns the corresponding PCC rule to the PDN GW according to the User Service information.
Step 509, the PDN GW returns a dedicate bearer Setup Response message to the target MME.
Step 510 to 511, the target MME sends a Relocation Request message to the target eNB, wherein the message carries the IP address allocated to the UE and the related parameters of the built voice special bearer on the PDN GM; and after receiving the Relocation Request message, the target eNB creates a voice special bearer and returns a Relocation Request acknowledgement to the target MME.
Step 512 to step 513, the target MME returns the dedicaterbearsetsetsetpoint message and the dedicaterbearsetsetpoint Response message to the PDN GW.
And 514, the PDN GW returns a PCC Provision Acknowledgemessage to the PCRF.
Step 515, the target MME returns a Forward Relocation Response message to the eMSC.
The execution sequence of the above steps 512, 513 and 515 is not strictly limited, and the sending of the PCCProvision acknowledgement message in step 514 needs to be executed after the PDN GW receives the dedicate beartersetup acknowledgement message.
Step 516, eMSC sends MAP-Prep-Handover rsp message to source MSC. The message carries information such as Invoke Id, Handover Number, selected UMTS Algorithms (selected UMTS Algorithms), selected Radio resource information (Chosen Radio resource information), and the like.
Step 517 to step 518, the source MSC sends an IAM message to the eMSC, and the eMSC sends an ACM message to notify the source MSC that the resource preparation of the target side is completed.
The flow of steps 519 to 531 may be the same as the flow of steps 220 to 232 described above.
To this end, in the fourth embodiment, resource preparation is performed for the handover of the UE from the CS domain to the PS domain, and the process of handover of the voice call service of the UE from the CS domain to the PS domain is completed.
In the first to fourth embodiments, the IP address and the voice specific bearer related parameter required by the UE are brought to the UE by the target MME or the target base station on the target side. In the fifth embodiment, in order to bring the IP address of the UE in the PS domain and the related parameters of the dedicated voice bearer to the UE after the dedicated voice bearer is successfully established, a message from the target MME to the eMSC is added in the signaling flow of the CS domain, the IP address of the UE in the PS domain and the related parameters of the dedicated voice bearer are first brought to the eMSC by the message, and then the IP address of the UE in the PS domain and the related parameters of the dedicated voice bearer are brought to the source MSC by the eMSC and are delivered to the UE by the source MSC.
Example five:
referring to fig. 4a, fig. 4a is a flow chart of preparation before the UE switches from the CS domain to the PS domain in the fifth embodiment of the present invention, where the flow chart may include the following steps:
step 601 to step 602, the UE initiates a call in the CS domain, and the source BSS sends a HO Required message to the source MSC.
603, after receiving the HO Required message, the source MSC initiates interoffice switching according to the target cell identification carried in the message; and the source MSC sends a MAP-Prep-Handover req message to the eMSC and informs the eMSC to prepare switching resources on the target side.
In the step, a source MSC sends a MAP-Prep-Handover req message to eMSC, which needs to add a new cell User Service information.
Steps 604 to 605 are the same as the above-described flow of steps 204 to 205.
Step 606, the target MME sends a Forward Relocation Rsp message to the eMSC. The message carries the IP address allocated to the UE and the IMSI of the UE.
Step 607, the eMSC sends Mod Request message to the target MGW to inform the target MGW of the UE IP address and the port number; the target MGW returns a Mod Response message to the eMSC.
The flow of steps 608 to 612 is the same as the flow of steps 210 to 214 described above.
Step 613, after the target MME receives the Bearer establishment response message returned by the PDN GW, bringing the IP address of the UE in the PS domain and the voice specific Bearer related parameter to the eMSC by providing a Bearer information provision message.
In this step 613, an NAS message, that is, a Bearer information provision message, is newly added, so that the IP address of the UE in the PS domain and the parameters related to the dedicated voice Bearer can be sent to the eMSC.
In addition, there is no strict order restriction between the transmission of the new message and the transmission of the decrypted router setup ack.
Step 614 to 615, the PDN GW returns PCC provision Acknowledgement to the PCRF; and the PCRF returns an Application acknowledgement corresponding to the Application Request to the eMSC.
Step 616, the eMSC sends Mod Request message to the target MGW to inform the target MGW of the UE IP address and the port number; the target MGW returns a Mod Response message to the eMSC.
Step 617, eMSC sends MAP-Prep-Handover rsp message source MSC. The MAP-Prep-Handover rsp message carries the IP address of the UE in the PS domain and the related parameters of the voice special bearer.
Step 618, the source MSC sends an IAM message to notify the eMSC.
Step 619, the eMSC sends an ACM message to notify the source MSC that the resource preparation of the target side is completed.
So far, the IP address required by the UE tangential PS domain and the establishment of the voice special bearing are all prepared.
Referring to fig. 4b, fig. 4b is a signaling flow diagram of handover of a UE from a CS domain to a PS domain in the fifth embodiment. The process may include the steps of:
step 620 to step 621, the source MSC sends the IP address of the UE in the PS domain and the voice dedicated bearer related parameter to the source BSS through the HO Command; and the source BSS sends the HOCommand to the UE, and further brings the IP address of the UE in the PS domain and the related parameters of the voice special bearer to the UE.
Step 622, the UE is switched to the target cell of the PS domain from the CS domain.
Step 623, the UE sends a Handover Detect (Handover Detect) message to the target eNB to notify the target eNB that it has accessed the target cell.
The flow of steps 624 to 631 is the same as the flow of steps 225 and 232 described above.
In this fifth embodiment, a Bearer information provision message sent by the target MME to the eMSC is added in the signaling flow of the CS domain, the message notifies the eMSC of the IP address of the UE in the PS domain and the voice-specific Bearer related parameters, and then the eMSC brings the IP address of the UE in the PS domain and the voice-specific Bearer related parameters to the UE through the source MSC.
Example six:
in the first to fifth embodiments, the UE may have the voice service in the CS domain and the data service in the PS domain at the same time. In the sixth embodiment, for resource preparation of the UE switching from the CS domain to the PS domain, the related schemes given in the above five embodiments can be adopted, and the sixth embodiment gives a technical scheme how to bring the IP address allocated to the UE and the voice-specific bearer related parameters to the UE.
Referring to fig. 5, fig. 5 is a handover flowchart of an existing UE from a PS domain to an EPS network. In the sixth embodiment, it is configured that the UE first initiates switching of the data service of the PS domain from the 3G PS domain to the EPS network; and then, initiating switching of the voice service of the CS domain from the CS domain to the EPS network, sending the IP address allocated to the UE and the voice specific bearer related parameter to a source side mobile management entity through a Forward relocation response message of PS switching, where the source SGSN brings the IP address and the voice specific bearer related parameter to the UE after a source Serving GPRS Support Node (SGSN) is used.
In the above embodiments, the resource preparation for the UE to switch from the CS domain to the PS domain is described in detail by using the eMSC as an intermediate network element. In practical application, for switching under control of an IP Multimedia Subsystem (IMS), eMSC may be directly replaced with PCHCF, so as to implement resource preparation for switching UE from CS domain to PS domain under control of IMS, and further implement switching UE from CS domain to PS domain.
Example seven:
referring to fig. 6, fig. 6 is a schematic diagram of an inter-IMS and CS Control Channel (ICCC) between existing IMS and CS domains. In the seventh embodiment, it is assumed that the handover of the UE from the CS domain to the PS domain is performed under IMS control. In the IMS control mode, an ICCC channel is established between the CS domain and the IMS domain, and the ICCC channel can be used for signaling transmission between the CS domain and the IMS domain.
In the switching process of the UE from the CS domain to the PS domain, the intermediate network element, namely the PCHCF, transmits the IP address of the UE and the voice special bearing related parameters to the UE through the ICCC channel after acquiring the IP address of the UE and the voice special bearing related parameters.
An embodiment of the present invention further provides a communication device 700, configured to control handover from a CS domain to a PS domain, where the communication device 700 is the above intermediate network element, and the communication device 700 may be the above eMSC or PCHCF. Referring to fig. 7, fig. 7 is a schematic structural diagram of a communication device 700 according to an embodiment of the present invention, where the communication device 700 may include: a transmitting unit 701 and a receiving unit 702; wherein,
a sending unit 701, configured to send a request for acquiring an IP address required for UE to switch to a PS domain to a target mobility management entity;
a receiving unit 702, configured to receive an IP address sent by a target mobility management entity.
The communication device 700 may further include: a resource preparation notification receiving unit 703, configured to receive a notification sent by the source MSC, requesting resource preparation for the UE to switch from the CS domain to the PS domain.
Correspondingly, referring to fig. 8, fig. 8 is a schematic structural diagram of another communication device 800 in the embodiment of the present invention. The communication device 800 may be the target MME described above, for mobility management in mobile communications, and the communication device 800 may include: a request receiving unit 801, a processing unit 802, and an address transmitting unit 803;
a request receiving unit 801, configured to receive a request for applying for an IP address required for the UE to switch to the PS domain from a target access gateway;
a processing unit 802, configured to apply for the IP address to a target access gateway, and receive the IP address returned by the target access gateway;
an address sending unit 803, configured to send out the IP address.
The sending unit of the communication device 700 in fig. 7 may be specifically configured to send a message carrying IP address application indication information to the target MME. Correspondingly, the processing unit 802 in fig. 8 may include: a gateway searching unit 8021, an application unit 8022 and a bearing information receiving unit 8023;
a gateway searching unit 8021, configured to find, according to the IP address application indication information carried in the request received by the request receiving unit 801, a target access gateway corresponding to the IP address application indication information;
an application unit 8022, configured to request the target access gateway to allocate the IP address to the UE;
a bearer information receiving unit 8023, configured to receive the IP address returned by the target access gateway.
After applying for the UE to the IP address required by the UE in the PS domain, a dedicated voice bearer required by the UE to perform the voice service needs to be established in the PS domain, and the bearer is established between the target access gateway and the target base station. The establishment of the voice-specific bearer may be performed by the communication device 700 instructing the target access gateway, or may be performed by the communication device 800 instructing the target access gateway.
Accordingly, the communication device 700 may further include a bearer establishment initiating unit 704 for sending user traffic information to the target PCRF. The user information can be carried to the target access gateway by the Application Request, and after receiving the Request, the target access gateway starts to establish a voice special bearer between the target access gateway and the target base station, wherein the voice special bearer is used after the UE is switched to the PS domain.
The sending unit 701 is further operable to bring user traffic information to the communication device 800 via a MAP-pre-Handover request if establishing a voice specific bearer is initiated by the communication device 800. The communication device 800 may further comprise: a service information receiving unit 804 and a bearer establishment initiating unit 805,
a service information receiving unit 804, configured to receive user service information sent from an external device, that is, the sending unit 701 of the communication device 700;
a bearer establishment initiating unit 805, configured to bring the user service information to the target access gateway through the Dedicated bearer setup Request, where the target access gateway starts to establish a Dedicated voice bearer between the target access gateway and the target base station, where the Dedicated voice bearer is used after the UE is switched to the PS domain after receiving the Request.
After the IP address required by the UE tangential PS domain is acquired and the establishment of the voice dedicated bearer is completed, the IP address and the voice dedicated bearer related parameters need to be brought to the UE. The communication device 700 may further include: the bearer information issuing unit 705 is configured to issue a bearer information,
a receiving unit 702, further receiving parameters related to the voice specific bearer from the target mobility management entity;
the bearer information issuing unit 705 is configured to send the IP address and the parameter related to the voice specific bearer received by the receiving unit to the source MSC. After receiving the relevant information sent by the bearer information issuing unit, the source MSC issues the IP address and the parameters related to the special voice bearer to the UE.
IP addresses and parameters associated with voice-specific bearers may also be issued by the communication device 800. Accordingly, the communication device 800 may also further include: and a bearer information issuing unit 806, configured to issue the IP address and the parameter related to the dedicated bearer of the voice to the target base station, or directly to the UE.
In summary, in the above technical solution provided in the embodiments of the present invention, the target mobility management entity obtains, from the target access gateway, the IP address required for the UE to switch from the CS domain to the PS domain, so as to prepare resources for the UE to switch from the CS domain to the PS domain, thereby implementing the UE to switch from the CS domain to the PS domain, ensuring continuity of the voice service of the user during the switching process, and improving user experience.
Claims (22)
1. A resource preparation method for switching from a CS domain to a PS domain, comprising:
when User Equipment (UE) needs to be switched from a Circuit Switching (CS) domain to a Packet Switching (PS) domain, sending a request for acquiring an IP address required by switching the UE to the PS domain to a target mobile management entity, and requesting the IP address from a target access gateway by the target mobile management entity according to the received request;
receiving the IP address sent by the target mobile management entity.
2. The method of claim 1, wherein the step of the target mobility management entity requesting the IP address from the target access gateway comprises:
and the target mobile management entity configures a target access gateway corresponding to the IP address application indication information according to the IP address application indication information carried in the received request, requests the target access gateway to distribute the IP address for the UE, and receives the IP address returned by the target access gateway.
3. The method of claim 2, wherein the IP address application indication information is: the special access point name APN has a corresponding relation with the address of the target access gateway;
the step of configuring the target access gateway by the target mobile management entity comprises the following steps: and the target mobile management entity configures the address of the target access gateway according to the acquired APN and the corresponding relation.
4. The method of claim 2, wherein the IP address application indication information is: a CS Voice service indicator for indicating the target mobile management entity to obtain the address of the target access gateway;
the step of configuring the target access gateway by the target mobile management entity comprises the following steps:
the target mobile management entity directly configures the address of the target access gateway according to the indication of the CS Voice indicator; or,
according to the indication of CS Voice indicator, a special APN corresponding to the address of a target access gateway is firstly configured, and then the address of the target access gateway is configured according to the APN and the corresponding relation.
5. The method of claim 2, wherein the IP address application indication information is: the address of the target access gateway.
6. The method of claim 1, wherein after receiving the IP address from the target mobility management entity, the method further comprises:
and informing the target access gateway to establish a voice special bearer between the target access gateway and the target base station, wherein the voice special bearer is used after the UE is switched to the PS domain, through the PCRF (policy and charging function).
7. The method of claim 6, wherein the step of notifying a target access gateway of the establishment of the voice-specific bearer comprises:
sending the received user service information sent by the source MSC to a target PCRF, and issuing a corresponding policy control and charging PCC rule to a target access gateway by the target PCRF according to the user service information;
and the target access gateway sends a request for establishing the voice special bearer to a target base station through a target mobile management entity according to the received PCC rule, and the target base station establishes the voice special bearer.
8. The method of claim 1, wherein before receiving the IP address from the target mobility management, the method further comprises:
and sending the received user service information sent by the source MSC to a target mobile management entity, and informing a target access gateway to establish the voice special bearer by the target mobile management entity through a target PCRF (policy and charging rules function) by using the received user service information.
9. The method of claim 8, wherein the step of notifying a target access gateway of the establishment of the voice-specific bearer comprises:
the target mobile management entity sends the user service information to a target PCRF through a target access gateway, and the target PCRF sends a corresponding PCC rule to the target access gateway according to the user service information;
and the target access gateway sends a request for establishing the voice special bearer to a target base station through a target mobile management entity according to the received PCC rule, and the target base station establishes the voice special bearer.
10. The method of claim 7 or 9, wherein the step of sending a request for establishing the voice-specific bearer to a target base station through a target mobility management entity comprises:
and the target mobile management entity issues the IP address and the voice special bearing related parameters to a target base station through the request.
11. The method of claim 10, wherein after creating the voice-specific bearer, the method further comprises:
and after the UE is switched from the CS domain to the PS domain, the target base station issues the IP address and the parameters related to the special voice bearer to the UE.
12. The method of claim 6 or 8, wherein after establishing the voice-specific bearer, the method further comprises:
the target mobile management entity directly issues the IP address and the voice special bearing related parameters to the UE; or,
and receiving the IP address and the parameters related to the voice special bearing sent by a target mobile management entity, and sending the IP address and the parameters related to the voice special bearing to UE through a source MSC.
13. The method of claim 6 or 8, wherein after establishing the voice-specific bearer, the method further comprises:
and when the UE further needs to be switched from the PS domain to the PS domain, the IP address and the parameters related to the voice special bearer are issued to the UE by the target mobile management entity through the source mobile management entity.
14. The method of claim 6 or 8, wherein after establishing the voice-specific bearer, the method further comprises:
and sending the IP address and the parameters related to the voice special bearer to the UE through a control channel ICCC channel between the IMS domain and the CS domain of the IP multimedia subsystem.
15. A communication device for controlling handover from a CS domain to a PS domain, comprising: a transmitting unit and a receiving unit; wherein,
a sending unit, configured to send a request for acquiring an IP address required for the UE to switch to the PS domain to a target mobility management entity;
a receiving unit, configured to receive the IP address sent by the target mobility management entity.
16. The communications device of claim 15, wherein the communications device further comprises: a resource preparation notification receiving unit, configured to receive a notification sent by the source MSC, that the communication device is required to perform resource preparation for the UE to switch from the CS domain to the PS domain.
17. The communications device of claim 15, wherein the communications device further comprises a bearer establishment initiation unit configured to send user traffic information to a target PCRF.
18. The communications device of claim 15, wherein the communications device further comprises: a unit for sending down the bearing information,
the receiving unit is further used for receiving the parameters related to the voice special bearing from a target mobile management entity;
and the bearing information issuing unit is used for sending the IP address and the parameters related to the voice special bearing to the source MSC.
19. A communication device for mobility management in mobile communications, comprising: the device comprises a request receiving unit, a processing unit and an address sending unit;
a request receiving unit, configured to receive a request for applying a target access gateway for an IP address required for the UE to switch to the PS domain;
the processing unit is used for applying for the IP address to a target access gateway and receiving the IP address returned by the target access gateway;
and the address sending unit is used for sending out the IP address.
20. The communication device of claim 19, wherein the processing unit comprises: the gateway searching unit, the applying unit and the bearing information receiving unit;
the gateway searching unit is used for finding a target access gateway corresponding to the IP address application indication information according to the IP address application indication information carried in the request received by the request receiving unit;
an application unit, configured to request the target access gateway to allocate the IP address to the UE;
and the bearing information receiving unit is used for receiving the IP address returned by the target access gateway.
21. The communications device of claim 19, wherein the communications device further comprises: a service information receiving unit and a bearing establishment indicating unit,
a service information receiving unit, which is used for receiving user service information sent from the outside;
and the bearing establishment indicating unit is used for sending the user service information to the target PCRF.
22. The communications device of claim 21, wherein the communications device further comprises: a load bearing information issuing unit;
the bearer information receiving unit is further configured to receive parameters related to the voice specific bearer;
and the bearing information issuing unit is used for issuing the IP address and the parameters related to the special voice bearing to a target base station or directly issuing the IP address and the parameters related to the special voice bearing to the UE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101405861A CN101370261B (en) | 2007-08-15 | 2007-08-15 | Resource preparation method and communication equipment for switching from CS field to PS field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101405861A CN101370261B (en) | 2007-08-15 | 2007-08-15 | Resource preparation method and communication equipment for switching from CS field to PS field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101370261A true CN101370261A (en) | 2009-02-18 |
| CN101370261B CN101370261B (en) | 2011-12-07 |
Family
ID=40413822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101405861A Active CN101370261B (en) | 2007-08-15 | 2007-08-15 | Resource preparation method and communication equipment for switching from CS field to PS field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101370261B (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888677A (en) * | 2009-05-13 | 2010-11-17 | 宏达国际电子股份有限公司 | Method of handling handover message decoding and related communication device |
| CN102076043A (en) * | 2009-11-24 | 2011-05-25 | 中兴通讯股份有限公司 | Method and system for implementing incoming relocation |
| WO2011134334A1 (en) * | 2010-04-26 | 2011-11-03 | 中兴通讯股份有限公司 | Implementing method and system for reverse single radio voice call continuity |
| WO2011134311A1 (en) * | 2010-04-26 | 2011-11-03 | 中兴通讯股份有限公司 | Method and system for implementing single channel voice continuity |
| CN102238678A (en) * | 2010-05-04 | 2011-11-09 | 中兴通讯股份有限公司 | Method and system for implementing single radio voice call continuity (SRVCC) |
| CN102244910A (en) * | 2010-05-10 | 2011-11-16 | 中兴通讯股份有限公司 | Communication system and method for enhancing single radio voice call service continuity |
| CN102415150A (en) * | 2009-04-23 | 2012-04-11 | 瑞典爱立信有限公司 | Ps to cs handover indicator |
| CN103905378A (en) * | 2012-12-25 | 2014-07-02 | 华为技术有限公司 | Data transmission method and device thereof |
| US9078173B2 (en) | 2010-04-30 | 2015-07-07 | Huawei Technologies Co., Ltd. | Method for handover from circuit switched domain to packet switched domain, device, and communications system |
| WO2015149430A1 (en) * | 2014-04-01 | 2015-10-08 | 中兴通讯股份有限公司 | Methods and devices for supporting voice service switchover between cs domain and ps domain and mobile terminals |
| US9307453B2 (en) | 2010-08-30 | 2016-04-05 | Huawei Technologies Co., Ltd. | Method, device and system for processing reverse single radio voice call continuity |
| CN109983781A (en) * | 2016-10-27 | 2019-07-05 | 日商艾菲克泽股份有限公司 | Content playing program and content reproduction device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8437368B2 (en) * | 2003-06-04 | 2013-05-07 | Nokia Corporation | System and method for handing over a call from a packet-switched network to a circuit-switched network |
| CN1889756B (en) * | 2005-07-16 | 2010-05-12 | 华为技术有限公司 | Method for double-mode terminal switching between block field and circuit field |
| CN101374160B (en) * | 2007-08-21 | 2012-08-22 | 华为技术有限公司 | Method, apparatus and system for distributing user address of packet network |
-
2007
- 2007-08-15 CN CN2007101405861A patent/CN101370261B/en active Active
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102415150B (en) * | 2009-04-23 | 2014-09-24 | 瑞典爱立信有限公司 | Method, node and system for communicating telecommunication network of user equipment |
| US9980181B2 (en) | 2009-04-23 | 2018-05-22 | Telefonaktiebolaget L M Ericsson (Publ) | PS to CS handover indicator |
| CN102415150A (en) * | 2009-04-23 | 2012-04-11 | 瑞典爱立信有限公司 | Ps to cs handover indicator |
| CN101888677A (en) * | 2009-05-13 | 2010-11-17 | 宏达国际电子股份有限公司 | Method of handling handover message decoding and related communication device |
| CN102076043A (en) * | 2009-11-24 | 2011-05-25 | 中兴通讯股份有限公司 | Method and system for implementing incoming relocation |
| CN102076043B (en) * | 2009-11-24 | 2015-09-16 | 中兴通讯股份有限公司 | A kind of method and system realizing Incoming reorientation |
| WO2011134334A1 (en) * | 2010-04-26 | 2011-11-03 | 中兴通讯股份有限公司 | Implementing method and system for reverse single radio voice call continuity |
| WO2011134311A1 (en) * | 2010-04-26 | 2011-11-03 | 中兴通讯股份有限公司 | Method and system for implementing single channel voice continuity |
| CN102238677A (en) * | 2010-04-26 | 2011-11-09 | 中兴通讯股份有限公司 | Method and system for implementing single radio voice call continuity (SRVCC) |
| CN102238677B (en) * | 2010-04-26 | 2016-04-13 | 中兴通讯股份有限公司 | The implementation method of single radio voice call continuity and system |
| US9078173B2 (en) | 2010-04-30 | 2015-07-07 | Huawei Technologies Co., Ltd. | Method for handover from circuit switched domain to packet switched domain, device, and communications system |
| WO2011137715A1 (en) * | 2010-05-04 | 2011-11-10 | 中兴通讯股份有限公司 | Method and system for realizing single radio voice call continuity |
| CN102238678B (en) * | 2010-05-04 | 2016-01-20 | 中兴通讯股份有限公司 | Single radio voice call continuity realization method and system |
| CN102238678A (en) * | 2010-05-04 | 2011-11-09 | 中兴通讯股份有限公司 | Method and system for implementing single radio voice call continuity (SRVCC) |
| CN102244910B (en) * | 2010-05-10 | 2014-12-10 | 中兴通讯股份有限公司 | Communication system and method for enhancing single radio voice call service continuity |
| WO2011140888A1 (en) * | 2010-05-10 | 2011-11-17 | 中兴通讯股份有限公司 | Communication system and method for enhanced single radio voice call continuity |
| CN102244910A (en) * | 2010-05-10 | 2011-11-16 | 中兴通讯股份有限公司 | Communication system and method for enhancing single radio voice call service continuity |
| US9307453B2 (en) | 2010-08-30 | 2016-04-05 | Huawei Technologies Co., Ltd. | Method, device and system for processing reverse single radio voice call continuity |
| CN103905378A (en) * | 2012-12-25 | 2014-07-02 | 华为技术有限公司 | Data transmission method and device thereof |
| CN103905378B (en) * | 2012-12-25 | 2017-04-12 | 华为技术有限公司 | Data transmission method and device thereof |
| US9936534B2 (en) | 2012-12-25 | 2018-04-03 | Huawei Technologies Co., Ltd. | Method and apparatus for data transmission |
| WO2015149430A1 (en) * | 2014-04-01 | 2015-10-08 | 中兴通讯股份有限公司 | Methods and devices for supporting voice service switchover between cs domain and ps domain and mobile terminals |
| CN109983781A (en) * | 2016-10-27 | 2019-07-05 | 日商艾菲克泽股份有限公司 | Content playing program and content reproduction device |
| CN109983781B (en) * | 2016-10-27 | 2022-03-22 | 日商艾菲克泽股份有限公司 | Content playback apparatus and computer-readable storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101370261B (en) | 2011-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101370261B (en) | Resource preparation method and communication equipment for switching from CS field to PS field | |
| KR102415078B1 (en) | Methods to support handover and corresponding devices | |
| RU2287912C2 (en) | Communication system containing a set of communication networks | |
| KR102282005B1 (en) | Method and apparatus for establishing user plane bearer | |
| EP2036382B1 (en) | An apparatus and method for transferring pdp context information for a terminal in the case of intersystem handover | |
| CN111182600B (en) | Method and apparatus for supporting UE mobility in wireless communication system | |
| JP6683383B2 (en) | Handover device and method | |
| EP3192305B1 (en) | Fast wifi to lte handover | |
| KR20140132747A (en) | Methods and apparatus for enhancing circuit-switched call fallback(csfb) service for a shared network node | |
| KR20220093403A (en) | Method for supporting handover and corresponding apparatus | |
| EP2952057B1 (en) | Methods and apparatus for notifying a switch of bearers in a system supporting carrier aggregation using a core network based separation architecture | |
| CN113079586B (en) | Method for handling multiple access protocol data unit session handover and user equipment thereof | |
| WO2009024082A1 (en) | A handing-off method and a terminal re-location method | |
| CN104349394B (en) | Method, system and the equipment for supporting business locally to shunt in a kind of cell framework | |
| CN109315008B (en) | Multi-connection communication method and device | |
| CN110719613B (en) | Method and device for establishing voice service | |
| KR20150131902A (en) | Method and apparatus for improving voice service quality in mobile wireless communication systems | |
| EP3255922B1 (en) | Service flow offloading method and apparatus | |
| CN103037452A (en) | Methods for supporting continuity of voice service | |
| WO2012041073A1 (en) | Method and system for carrying out flow transfer | |
| WO2015018304A1 (en) | Method and device for host configuration | |
| WO2012152130A1 (en) | Bearer processing method and device | |
| WO2009149656A1 (en) | Method, device and system for implementing service handover | |
| CN101374160B (en) | Method, apparatus and system for distributing user address of packet network | |
| WO2006037664A2 (en) | Method for managing communication sessions and related devices |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20090218 Assignee: Apple Computer, Inc. Assignor: Huawei Technologies Co., Ltd. Contract record no.: 2015990000755 Denomination of invention: Resource preparation method and communication equipment for switching from CS field to PS field Granted publication date: 20111207 License type: Common License Record date: 20150827 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model |