CN102625380B - Changing method and system - Google Patents
Changing method and system Download PDFInfo
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- CN102625380B CN102625380B CN201110033999.6A CN201110033999A CN102625380B CN 102625380 B CN102625380 B CN 102625380B CN 201110033999 A CN201110033999 A CN 201110033999A CN 102625380 B CN102625380 B CN 102625380B
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Abstract
The invention discloses a kind of changing method, including：After source SA receives handover request, notify that target SA is that to be switched user equipment (UE) prepares resource by sip message；Target SA prepares resource for the to be switched UE, sets up and the carrying between the source SA, and notifies that the source SA switchings are ready to complete；The source SA notifies that the to be switched UE is switched to objective network.The present invention discloses a kind of switched system.This invention simplifies handover request flow process, relative to prior art, improves the efficiency of system switching, user does not feel as the exception of business switching, is not in switching concussion problem, improves the Consumer's Experience effect of business.
Description
Technical field
The present invention relates to cutting in IP Multimedia System (IMS, the IP Multimedia Subsystem) network architecture
Technology is changed, more particularly to one kind is based on the changing method of IMS centralized traffics (ICS, IMS Centralized Service) and cuts
Change system.
Background technology
From the point of view of the evolution and development of communication network, the development of core network architecture presents two main trend：One is net
The IP (Internet Protocol) of network changes, and two is the fusion of various networks.Therefore following core net will not be further divided into circuit
Various core nets such as (CS, Circuit Switched) domain, packet switch (PS, PacketSwitching) domain and IMS are exchanged,
And an IP-based unified service control system is would is that, all of business (includes speech business, supplementary service and increment
Business etc.) all by the unified service control system realizing.
IP-based unified service control system (hereinafter referred to as unified IP kernel heart net) has two features, and one is voice
Session initiation protocol (SIP, Session Initiation Protocol) is adopted etc. the realization of business；Two is the Service control
System is unrelated with access technology, i.e., user can be accessed by PS and can also be accessed by CS.What PS access ways here referred to
It is that user can pass through GPRS (general packet radio service) (GPRS, GeneralPacket Radio Service), WLAN
Packet networks such as (WLAN, Wireless Local Area Network) is linked into core net.And CS access ways refer to use
Family is by circuit domain Radio Access Network such as base station sub-system (BSS, Base Station Subsystem) or wireless network
The equipment such as subsystem (RNS, RadioNetwork Subsystem) are linked into core net.Whether which kind of access way is adopted,
Business is all provided by above-mentioned unified IP kernel heart net.
Fig. 1 is the application scenarios schematic diagram that unified IP kernel heart net is linked into using CS access ways, as shown in figure 1, using
Family equipment (UE, User Equipment) 101 passes through circuit domain access network (such as BSS or RNS) 102 and signaling adaptation device
103 are linked in unified IP kernel heart net 104, and signaling adaptation device 103 plays necessary Signalling conversion effect, all of business
There is provided by unified IP kernel heart net 104.
Fig. 2 is the Organization Chart that CS accesses unified IP kernel heart net, as shown in Fig. 2 CS accesses the frame of unified IP kernel heart net
Structure includes following network element：User equipment (UE, User Equipment) 201, base station controller (BSC, Base Station
Controller) or radio network controller (RNC, Radio NetworkController) 202, signaling adaptation device (SA,
Signalling Adapter) 203, WMG (MGW, Media Gateway) 204, integrated service control function (ISCF,
Integrated Service ControlFunction) 205, wherein, BSC and RNC202 is used to realize that the user in CS domains to access
With the function such as the management and control of Radio Resource.Interface between BSC and SA203 adopts Base Station Subsystem Application Part
(BSSAP, Base Station System Application Part) signaling, the interface between RNC and SA203 is using wireless
Access network application obscure portions (RANAP, Radio Access Network ApplicationPart) signaling, BSSAP and RANAP
Signaling is referred to as CS access signalings.Interface between SA203 and equipment 202 adopts CS access signalings, the interface and ISCF between
Using Session Initiation Protocol, SA203 realizes the translation function between CS access signalings and sip message and the control to MGW204.
MGW204 mainly realizes continuing and processing, set up the functions such as the carrying of medium surface for Media Stream.ISCF 205 plays mobility pipe
The function such as reason, business route, Call- Control1, Service control, data storage.It can come real by one or more functions entity
It is existing.
Specifically, UE 201 is linked into SA 203 by BSC or RNC, and SA203 receives the CS of BSC or RNC transmissions and connects
SIP signalings are converted into after entering signaling and are sent to ISCF205, now SA replaces user to set equivalent to user agent is served as
Standby 201 are linked into ISCF205, carry out business route and Call- Control1 by ISCF205, and thus user UE201 can be used with distal end
Family is set up and connects and conversed.
In a wireless communication system, when UE moves to another from a cell (referring to the coverage of base station or base station)
During cell, need to carry out channel switching to not interrupt communication.
Whether same RNC (or BSC) is according to user before and after switching, and switching can be divided into cutting for RNC (or BSC) inside
Change and across the switching of RNC (or BSC).RNC (or BSC) internal switching only needs to be completed by RNC (or BSC), and core net is not joined
With process, and the switching across RNC (or BSC) then needs core net to be also carried out corresponding service switchover to process.It is according to the present invention
It is the service switchover across RNC or BSC.For all across RNC and the service switchover across BSC, differing only in access signaling is
RANAP or BSSAP, and the process logic of the service switchover of core-network side is all identical.
Fig. 3 is the flow chart of switching of the prior art, as shown in figure 3, UE1 is the user terminal for switching, UE2 is
The user terminal conversed with UE1, source RNC are the RNC of user's access before switching, and Target RNC is that user will be switched to
RNC, source SA are the SA of the source network before user's switching, and target SA is the SA of the objective network that user will be switched to, and ISCF is
The ISCF of source network.Business scenario is that UE1 is switched to Target RNC from source RNC in UE1 and UE2 communication process.
ICS strengthens registration process and comprises the following steps：
Step 301：UE sends measurement report (Measurement Report) to source RNC.
Step 302：According to measurement report, source RNC judges that UE1 needs to switch over.
Step 303：Source RNC sends handover request (RELOCATION REQUIRED) to source SA；
Step 304：Handover request is converted into call transfer request (REFER) and is sent to ISCF by source SA.The call forwarding
The address parameter carried during destination address (Refer-To) header field for contacting is required in request message is target position to be switched to
Area's mark (Target LAI) is put, method (method) parameter is HANDOVER, due to HANDOVER and be not belonging in method
The standard method title of definition, it is therefore desirable to which method parameters are extended.Additionally, in the handover requests that receive of source SA
Parameter necessary to switching is carried, including but not limited to：Switch reasons, switching type, cell-of-origin, Target cell etc..It is above-mentioned
Handoff parameter is sent to ISCF in being also placed in REFER message, these parameters be placed on REFER Session Description Protocol (SDP,
Session Description Protocol) in pass through extensible markup language (XML, Extensible Markup
Language) extension carrying.
Step 305：ISCF returns call transfer request received message (202Accepted) to source SA after receiving REFER.
According to the HANDOVER values in method parameters in REFER message, ISCF can determine that the message is a handover request, further,
According to operator's configuration and parameter it may also be determined that the address of target SA.
Step 306：REFER message is forwarded it to target SA by ISCF.
Step 307：Target SA returns call transfer request received message to ISCF after receiving REFER
(202Accepted)。
Step 308：Target SA is the reserved resource of switching terminal, rear send handover request (RELOCATION to Target RNC
REQUEST)。
Step 309：Target RNC carries out access network resource reservation procedure, is that UE1 accesses 3G network distribution phase from Target RNC
The Radio Resource answered.Target RNC sends switching request response (RELOCATION REQUEST ACK) to target SA afterwards.
Step 310：Target SA sends a notification message (NOTIFY) to ISCF, notifies that ISCF switchings are ready to complete.
Step 311：ISCF is returned after receiving notice and is confirmed message (200OK).
Step 312：ISCF initiates calling to target SA and invites (INVITE), carries the media information of UE2 in sdp.
Step 313：Distant end media surface information is updated to target SA the media information of UE2, it is rear to ISCF send response
Message (200OK), carries local terminal media information SDP1 in message.
Step 314：ISCF sends response to target SA and confirms message (ACK).
Step 315：ISCF conversates description information negotiations process with UE2, and UE2 is by the distant end media information updating of itself
For the media information in the SDP1 of target SA.
Step 316：ISCF sends a notification message (NOTIFY) to source SA, notifies that SA switchings in source are ready to complete.
Step 317：Source SA is returned after receiving notice and is confirmed message (200OK).
Step 318：Source SA sends switching command (Relocation Command) to source RNC.
Step 319：Source RNC sends switching command to UE1.
Step 320：UE1 switches to Target RNC, and UE1 starts the Radio Resource of access target RNC.
Step 321：After Target RNC detects UE1, switching probe message (Relocation is sent to target SA
Detect)。
Step 322：After Target RNC receives the handover success message of UE1 transmissions, switching is sent to target SA and completed
Message (Relocation Complete).
Step 323：Target SA sends a notification message (NOTIFY) to ISCF, notifies that ISCF switchings are completed.
Step 324：After ISCF receives notification message, return to target SA and confirm message (200OK).
Step 325：To source SA forwardings notification message (NOTIFY), ISCF notifies that SA switchings in source are completed.
Step 326：After source SA receives notification message, return to ISCF and confirm message (200OK).
Step 327：Source SA notifies source RNC release signalings link and bearing resource.
Though prior art can complete basic service switchover, there is problems：
1st, process messages number is excessive, and flow process interaction is complicated.In the prior art, switching control is completed by ISCF, and ISCF connects
After receiving the handover request of source SA transmissions, next have two process, one is that notice target SA switches over process, two be with
Target SA carries out medium surface SDP negotiation.In the prior art, the two processing procedures are to be disappeared by separate two respectively
Come what is realized, i.e. ISCF first passes through call transfer request and notifies that target SA switches over process (step 306～step breath interaction flow
It is rapid 311), subsequently further through calling invite request and target SA carry out SDP negotiation (step 312～step 314).This realization side
Method causes that the interacting message between ISCF and target SA is excessive and flow process is complicated, so as to affect system treatment effeciency.
2nd, the SDP renewal processes of ISCF and target SA may result in switching concussion problem.It is ISCF elder generations in prior art
The distant end media surface information of target SA is consulted into the SDP (step 306～step 307) for UE2, then distant end media is carried out to UE2
Face updates.Carry out UE2 medium surface to update is held consultation (step 315) using the SDP and UE2 of target SA, and this may lead
Cause UE2 apply again a new port for and switching terminal communicate, now the media surface information of UE2 will change, this
Will be the SDP of the UE2 consulted before causing target SA invalid, subsequently also need to again with UE2 new media surface information again and target
SA carries out medium surface negotiation, that is, result in switching concussion problem.
The content of the invention
In view of this, present invention is primarily targeted at providing a kind of changing method and switched system, can realize that ICS strengthens
Communication service of the network to other mobile network users is compatible.
To reach above-mentioned purpose, the technical scheme is that what is be achieved in that：
A kind of changing method, including：
After source SA receives handover request, notify that target SA is that to be switched user equipment (UE) prepares money by sip message
Source；
Target SA prepares resource for the to be switched UE, sets up and the carrying between the source SA, and notifies described
SA switchings in source are ready to complete；
The source SA notifies that the to be switched UE is switched to objective network.
Preferably, the relevant parameter and/or switching mark of switching are carried in the sip message.
Preferably, the relevant parameter and/or switching mark that switching is carried in the sip message is specially：
The relevant parameter and/or switching mark of switching are carried in the message body of the sip message.
Preferably, the relevant parameter of the switching includes switching target small area and target radio network controller RNC
The coding/decoding information that the media coding/decoding information and current business that information, the source SA are supported is adopted.
Preferably, the relevant parameter and/or switching mark that switching is carried in the sip message is specially：
Switching mark is carried in the message header of the sip message.
Preferably, the sip message is transfer request REFER message, and/or, INVITE is invited in calling.
Preferably, carry switching mark to be specially in the message header of the sip message：
For the REFER message, the switching mark be carried on the Route header fields of the REFER message or
In Request-URI header fields.
Preferably, by sip message, source SA notifies that target SA is that to be switched UE preparations resource is specially：
The source SA directly notifies target SA by sip message and prepares resource for be switched UE；
Or, by sip message Jing integrated service control function entity ISCF, the source SA notifies that target SA is
To be switched UE prepares resource.
Preferably, the source SA notifies target SA for be switched UE preparation resource tools by sip message Jing ISCF
Body is：
After the source SA receives handover request, by ISCF described in REFER message informings；The ISCF according to
Switching mark judgement in REFER message need to be switched over, and obtain the target SA address, and pass through SIP session invitations
INVITE notifies target SA and prepares resource for be switched UE.
Preferably, the source SA passes through ISCF described in REFER message informings, and is disappeared by SIP INVITE by the ISCF
Breath notify target SA for be switched UE prepare resource when, do not carry in the INVITE and the to be switched UE sessions
Opposite end UE conversation media information.
Preferably, the ISCF obtains the target SA address and is specially：
The ISCF selects target SA according to Target cell and operator's configuration strategy；
Or, by source SA selection targets SA and the address of target SA is carried on and is sent to the ISCF's
In REFER message, the ISCF is notified.
Preferably, methods described also includes：
After target SA receives the switching sip message that the source SA sends, identified according to the switching in sip message
It is determined that needing switching, handover request is sent to the Target RNC；Receive the switching request response that the Target RNC sends
Afterwards, it is current session reserved media face resource, and notifies the ISCF；
The ISCF by sip message carry the medium surface resource information of target SA with the to be switched UE sessions
Opposite end UE carry out medium surface negotiation, make opposite end UE by media that the distant end media face resource updates of itself are target SA
Face resource.
Preferably, the source SA passes through ISCF described in REFER message informings, and is disappeared by SIP INVITE by the ISCF
Breath notify target SA for be switched user equipment (UE) prepare resource when, target SA by call proceeding message 183 lead to
Know the ISCF；
When the source SA notifies that target SA prepares resource for be switched UE by sip message directly or by the ISCF,
Target SA notifies the ISCF by INVITE.
Preferably, when the source SA notifies target SA by sip message Jing ISCF and prepares resource for be switched UE,
Methods described also includes：
Complete opposite end UE of target SA with the to be switched UE sessions complete IP carry set up after, the source SA connects
Receive switching and be ready to complete notice, notify that the source SA switching be ready to complete by sip message by the ISCF.
The source SA by sip message directly notify target SA for be switched UE prepare resource when, methods described is also
Including：
Complete opposite end UE of target SA with the to be switched UE sessions complete IP carry set up after, the source SA connects
Receive switching and be ready to complete notice, notify that the source SA switching be ready to complete by sip message by target SA.
Preferably, methods described also includes：
After target SA receives the handoff completion message of the Target RNC, notify that source SA has switched by sip message
Into.
Preferably, when the source SA notifies target SA by sip message Jing ISCF and prepares resource for be switched UE,
By sip message, target SA notifies that the source SA switchings complete to be specially：Target SA sends response to the ISCF
Message 200OK notifies that the ISCF switchings are completed, and the ISCF sends to the source SA after receiving the 200OK message and notifies
Message NOTIFY notifies that the ISCF switchings are completed；
The source SA by sip message directly notify target SA for be switched UE prepare resource when, target SA
Notify that the source SA switchings complete to be specially by sip message：Target SA directly sends NOTIFY to the source SA and notifies
The source SA switchings are completed.
A kind of switched system, is applied in wireless communication system, the switched system include source SA, source RNC, Target RNC,
Target SA, to be switched UE and the UE with to be switched UE sessions, wherein,
Source SA, for, after handover request is received, notifying that target SA is that to be switched UE prepares money by sip message
Source；And, after target SA prepares resource for the to be switched UE, notify that the to be switched UE is switched to objective network；
Target SA, for preparing resource for the to be switched UE, sets up and the carrying between the source SA, and notifies described
SA switchings in source are ready to complete；
Preferably, the relevant parameter and/or switching mark of switching are carried in the sip message.
Preferably, the relevant parameter and/or switching mark of switching are carried in the message body of the sip message, wherein, it is described
The relevant parameter of switching includes information, the media coding/decoding information of source AG supports of switching target small area and Target RNC
And the coding/decoding information that current business is adopted.
Preferably, switching mark is carried in the message header of the sip message.
Preferably, the sip message is transfer request REFER message, or calls invitation INVITE；Wherein, it is described
Carry switching mark to be specially in the message header of sip message：For the REFER message, the switching mark is carried on described
In the Route header fields or Request-URI header fields of REFER message.
Preferably, the source SA is further used for directly notifying target SA for be switched UE preparations by sip message
Resource；
Or, the source SA is further used for by sip message and Jing ISCF notify that target SA is that to be switched UE is accurate
Standby resource.
Preferably, the source SA is further used for by sip message and Jing ISCF notify that target SA is to be switched UE
Prepare resource to be specially：
The source SA further after handover request is received, by ISCF described in REFER message informings；The ISCF
Need to be switched over according to the switching mark judgement in REFER message, obtain the target SA address, and pass through SIP session invitations
INVITE notifies target SA and prepares resource for be switched user equipment (UE).
Preferably, the source SA further passes through ISCF described in REFER message informings, and passes through SIP by the ISCF
INVITE notify target SA for be switched user equipment (UE) prepare resource when, do not carry in the INVITE with
The conversation media information of the opposite end UE of the to be switched UE sessions.
Preferably, the ISCF further selects target SA according to Target cell and operator's configuration strategy；
Or, source SA selection targets SA, and the address of target SA is carried on is sent to the ISCF's
In REFER message, the ISCF is notified.
In the present invention, after source SA receives the handover request of source RNC, notify that target SA is to be cut by sip message
Change UE and prepare resource；After receiving sip message, target SA is that to be switched UE prepares resource, and sets up the holding and SA of source between
Carry, notify that SA switchings in source are ready to complete afterwards；Source SA notifies that to be switched UE is switched to objective network.Relative to prior art, this
Invention simplifies handover request flow process, relative to prior art, improves the efficiency of system switching, and user does not feel as business
The exception of switching, is not in switching concussion problem, improves the Consumer's Experience effect of business.
Description of the drawings
Fig. 1 is the application scenarios schematic diagram that unified IP kernel heart net is linked into using CS access ways；
Fig. 2 is the Organization Chart that CS accesses unified IP kernel heart net；
Fig. 3 is the flow chart of switching of the prior art；
Flow charts of the Fig. 4 for the changing method of the embodiment of the present invention one；
Flow charts of the Fig. 5 for the changing method of the embodiment of the present invention two.
Specific embodiment
The basic thought of the present invention is, after source SA receives the handover request of source RNC, to notify mesh by sip message
Mark SA is that to be switched UE prepares resource；After receiving sip message, target SA is that to be switched UE prepares resource, and is set up and source
Carrying between SA, notifies that SA switchings in source are ready to complete afterwards；Source SA notifies that to be switched UE is switched to objective network.
It is to make the object, technical solutions and advantages of the present invention become more apparent, by the following examples and referring to the drawings, right
The present invention is further described.
The switched system of the present invention, is applied in wireless communication system, specifically includes source SA, source RNC, Target RNC, target
SA, to be switched UE (UE1) and the UE (UE2) with to be switched UE sessions, wherein, after source SA receives the handover request message of source RNC,
Notify that target SA prepares resource by sip message；Target SA is prepared resource and IP carryings is set up between user equipment (UE) 2；Source
SA notifies that user terminal UE1 is switched to objective network.In the switched system of the present invention, network structure and existing network structure phase
More do not change, simply, the function realized by each network element is no longer identical, the message interacted between each network element and message
The information of middle carrying is no longer identical, and after network element receives these message, performed function is also unlike the prior art.The present invention
Interactive mode between the main function of realizing network element and each network element is described in detail.
By conversation initiating protocol message sip message, above-mentioned source SA notifies that target SA prepares resource, specifically, source SA passes through
Sip message directly notifies that target SA or source SA notify target SA via ISCF by sip message.
Source SA notifies target SA via source integrated service control function ISCF by sip message, specifically, source SA passes through
According to the switching mark in REFER message, REFER message informing ISCF, ISCF judge that needs are switched over after, target SA is obtained
Address, and target SA is notified by SIP session invitation messages INVITE.
The relevant parameter and/or switching mark of switching are carried in above-mentioned sip message.
Or, the relevant parameter and/or switching mark of switching are carried in the message body of sip message, wherein, the correlation of switching
Parameter includes that switching target small area and information, the media coding/decoding information of source AG supports and the current business of Target RNC are adopted
Coding/decoding information.
Specifically, switching mark is carried in the message header of sip message.
Above-mentioned sip message is transfer request REFER message, or calls invitation INVITE；Wherein, sip message disappears
Carry switching mark to be specially in breath head：For REFER message, switching mark be carried on the Route header fields of REFER message or
In Request-URI header fields.
Above-mentioned INVITE body adopts XML format.
Source SA is further used for directly notifying target SA for be switched UE preparation resources by sip message；
Or, source SA is further used for by sip message and Jing sources integrated service control function entity ISCF notifies target
SA is that to be switched UE prepares resource；Specifically, source SA is after handover request is received, by REFER message informing ISCF；
ISCF need to be switched over according to the switching mark judgement in REFER message, obtained target SA address, and passed through SIP session invitations
INVITE notifies that target SA is that to be switched user equipment (UE) prepares resource.
Above-mentioned source SA is further by REFER message informing ISCF, and notifies mesh by SIP INVITE by ISCF
When mark SA is that to be switched user equipment (UE) prepares resource, the meeting with the opposite end UE of to be switched UE sessions in INVITE, is not carried
Words media information.
Above-mentioned ISCF is further according to Target cell and operator's configuration strategy selection target SA；
Or, source SA selection targets SA, and the address of target SA is carried on is sent in the REFER message of ISCF, lead to
Know ISCF.
Target SA is that to be switched UE prepares resource, specifically, target SA receives above-mentioned INVITE or REFER (sources
SA receives the handoff notification message sent to target SA after handover request) after message, judged according to the switching mark in message
After needs are switched over, handover request is sent to Target RNC.After target SA receives the switching request response of Target RNC transmission, mesh
Mark SA is by setting up IP carryings between ISCF and user equipment (UE) 2.
ISCF carries the medium surface resource information of target SA with carrying out with the opposite end UE of to be switched UE sessions by sip message
Medium surface consult, make opposite end UE by the distant end media face resource updates of itself for target SA medium surface resource.
Source SA is by REFER message informing ISCF, and notifies that target SA be to be cut by SIP INVITE by ISCF
When changing user equipment (UE) preparation resource, target SA notifies ISCF by call proceeding message 183；Source SA is direct by sip message
Or by ISCF notify target SA be to be switched UE prepare resource when, target SA notifies ISCF by INVITE.Above-mentioned 183
The reserved medium surface resource of target SA is carried in the SDP of message and INVITE, and carries switching mark.ISCF is received
After 183 message or above-mentioned INVITE, ISCF carries out media with UE2 by the media information that sip message carries target SA
Face is consulted, and the distant end media surface information of oneself is updated to UE2 the media surface information of target SA, and by the media surface information of oneself
ISCF is brought by sip message, ISCF sends the media surface information that sip message carries the UE2 for getting to target SA.
ISCF sends the media surface information that sip message carries the UE2 for getting to target SA, specifically, sip message is referred to
Temporary Response message PRACK or response message 200OK.
Source SA receive switching be ready to complete notice after, to source RNC send switching command.
If source SA is to notify that target SA is switched over using REFER message and INVITE, then source SA before
It is, after completing target SA and UE2 completes IP loading establishing process, to be disappeared by SIP by ISCF that the switching for receiving is ready to complete notice
The source SA switchings of breath notice are ready to complete.If source SA directly passes through sip message or notifies target by sip message Jing ISCF before
SA is switched over, then it is to complete target SA and UE2 completes IP loading establishing process that the switching that source SA is received is ready to complete notice
Afterwards, notify that source SA switching be ready to complete by sip message by target SA.Here sip message each means notification message NOTIFY.
If source SA is to notify that target SA is switched over using REFER message and INVITE, then target before
By sip message, SA notifies that SA switchings in source complete to refer to, target SA sends response message 200OK to ISCF and notifies that ISCF has switched
Notify that ISCF switchings are completed to the source SA NOTIFY that send a notification message after 200OK message is received into, ISCF.If source SA is straight before
Connected sip message or notified that target SA was switched over by sip message Jing ISCF, then target SA was notified by sip message
Source SA switching complete to refer to, target SA directly to source SA send a notification message NOTIFY notify source SA switching complete.
Fig. 4 is the flow chart of the changing method of the embodiment of the present invention one, describes in UE1 and UE2 communication process, such as Fig. 4
Shown, UE1 specifically includes following steps from the switching that source RNC is switched to Target RNC：
Step 401, UE send measurement report (Measurement Report) to source RNC.
According to measurement report, step 402, source RNC judge that UE1 needs to switch over.
Step 403, source RNC send handover request (RELOCATION REQUIRED) to source SA.
The request is converted into call transfer request (REFER) and is sent to ISCF by step 404, source SA, and the call forwarding please
The address parameter carried during destination address (Refer-To) header field for contacting is required in seeking message is target location to be switched to
Area identifies (target LAI), and method (method) parameter is HANDOVER as switching mark.As HANDOVER does not belong to
Standard method title defined in method, it is therefore desirable to which method parameters are extended.Additionally, what source SA was received
Parameter necessary to some other switching carried in handover request is sent to ISCF in being also placed in REFER message, these parameters
Carried by XML during the SDP of REFER can be placed on, it would however also be possible to employ other suitable methods.
Step 405, ISCF return call transfer request received message (202Accepted) to source SA after receiving REFER.
According to the HANDOVER values in method parameters in REFER message, ISCF can determine that the message is a handover request.ISCF is selected
The method of target SA can be passed through according to the configuration strategy of Target cell and operator, or after being selected by source SA
REFER message brings ISCF, for example, can bring ISCF by the route header fields in REFER message, it is also possible to expanded by XML
Exhibition is carried.
Step 406, ISCF send calling to target SA and invite request (INVITE).Switching mark is carried in INVITE
Know.It can be come real by the method for method parameter spreads in route header fields that INVITE carries the method for switching mark
It is existing, can for example adopt following form, route：Destination address；Method=handover.INVITE carries switching mark
The method of knowledge can also be by Request-URI header fields to the method for parameter spread to realize, for example, can adopt as follows
Form：Destination address；Method=handover.Additionally, the switching that the REFER that ISCF is received from source SA is carried in asking
Necessary parameter is sent to target SA in being also placed in INVITE, and the mode that these parameters are carried is using of the prior art
Method, can be extended XML extensions in being also placed on the SDP of REFER and carry to refer header fields.Do not take in the request message
The media surface information of tape terminal.
Step 407, target SA are the reserved resource of switching terminal.It is rear to Target RNC send handover request (RELOCATION
REQUEST), switching-related parameters are carried in message.
Step 408, Target RNC carry out access network resource reservation procedure, are that UE1 accesses 3G network point from Target RNC in the future
With corresponding resource.Target RNC sends switching request response (RELOCATION REQUEST ACK) to target SA afterwards.
Step 409, target SA send call proceeding message (183 call progressing) to ISCF, carry in SDP
The media surface information of target SA.
Step 410, ISCF carry out medium surface session negotiation with UE2 by the media surface information that sip message carries target SA,
The distant end media surface information of itself is updated to UE2 the media surface information of target SA, and the media surface information of itself is passed through SIP
Message is sent to ISCF.Thus ISCF can obtain the terminal media surface information after the possible renewals of UE2, and follow-up ISCF is used
The terminal media surface information of the UE2 after renewal and target SA carry out SDP negotiation.
Step 411, ISCF send call proceeding message (PRACK) to target SA, the UE2 got in carrying step 410
Media surface information.
The distant end media surface information of itself, after target SA receives PRACK, is updated to the medium surface of UE2 by step 412
Information, it is rear to ISCF send Temporary Response confirm message (200OK).
Step 413, ISCF judge source SA by the Temporary Response for receiving the transmission of target SA is confirmed after message
Switching is ready to complete, and ISCF sends a notification message (NOTIFY) to source SA, notifies that SA switchings in source are ready to complete.
Step 414, source SA are returned after receiving notice and confirm message (200OK).
Step 415, source SA send switching command (Relocation Command) to source RNC.
Step 416, source RNC send switching command to UE1.
Step 417, UE1 switch to Target RNC, and UE1 starts the Radio Resource of access target RNC.
Step 418, after Target RNC detects UE1, sends switching probe message (Relocation to target SA
Detect)。
Step 419, after Target RNC receives the handover success message of UE1 transmissions, sends switching to target SA and completes
Message (Relocation Complete).
Step 420, target SA send response (200OK) to ISCF.
Step 421, after ISCF receives response message, can determine whether out that switching has been completed, and ISCF is responded to target SA
Answer confirmation message (ACK).
Step 422, ISCF send a notification message (NOTIFY) to source SA, notify that SA switchings in source are completed.
Step 423, after source SA receives notification message, returns to ISCF and confirms message (200OK).
Step 424, source SA notify source RNC release signalings link and bearing resource.
As can be seen that the present embodiment one solves two problems present in prior art from above-mentioned flow process：
1st, notice target SA being performed separately in prior art is switched over by the present embodiment process and with target SA
The process of medium surface SDP negotiation is carried out, is realized in being merged into INVITE flow processs (step 406), so that switching flow
More simplify.
2nd, SDP (step 410) of the present invention by first acquisition UE2, then distal end SDP renewal (steps are carried out to target SA
411) method, has evaded switching concussion problem present in prior art.
Fig. 5 is the flow chart of the changing method of the embodiment of the present invention one, describes in UE1 and UE2 communication process, such as Fig. 5
Shown, UE1 specifically includes following steps from the switching that source RNC is switched to Target RNC：
Step 501, UE send measurement report (Measurement Report) to source RNC.
According to measurement report, step 502, source RNC judge that UE1 needs to switch over.
Step 503, source RNC send handover request (RELOCATION REQUIRED) to source SA.
The handover request for receiving is converted into call transfer request (REFER) and is sent to target by step 504, source SA
SA.The selection of target SA can be according to Target cell and operator's configuration strategy.The destination address for contacting is required in the request
(Refer-To) address parameter carried in header field is that target location area to be switched to identifies (target LAI), method
(method) parameter is HANDOVER.Due to HANDOVER and the standard method title defined in method is not belonging to, therefore is needed
Method parameters are extended.Additionally, some other switching institute carried in the handover requests that receive of source SA is required
Parameter be also placed in REFER message in be sent to target SA, the mode that these parameters are carried adopts method of the prior art, can
XML extensions carrying in the SDP of REFER can be also placed on to be extended to REFER header fields.Additionally, source SA is also by the address of ISCF
Target SA is sent in being placed on REFER, succeeding target SA can find ISCF accordingly.The address carrying mode of ISCF can pass through
XML extensions in the SDP of REFER message are carried.
Step 505, target SA return call transfer request received message to source SA after receiving REFER
(202Accepted)。
According to the HANDOVER values in method parameters in REFER message, step 506, target SA judge that this is one and cuts
Change request, be then the reserved resource of switching terminal, rear send handover request (RELOCATION REQUEST) to Target RNC.
Step 507, Target RNC carry out access network resource reservation procedure, are that UE1 accesses 3G network point from Target RNC in the future
With corresponding resource.Target RNC sends switching request response (RELOCATION REQUEST ACK) to target SA afterwards.
Step 508, target SA send session invitation to ISCF according to the ISCF addresses in the REFER message for receiving
(INVITE), carry the media surface information of target SA.Also carry switching mark simultaneously in INVITE, switch the carrying method of mark
With step 406.
Step 509, ISCF understand to need to carry out at related switching according to switching mark therein after receiving INVITE
Reason, ISCF carry out medium surface session negotiation with UE2 by the media surface information of sip message carrying target SA, and UE2 is by the remote of itself
Media surface information of the end medium surface information updating for target SA, and the media surface information of itself is sent to by sip message
ISCF.Thus ISCF can obtain the terminal media surface information after the possible renewals of UE2, after follow-up ISCF is i.e. using updating
The terminal media surface information of UE2 and target SA carry out SDP negotiation.
Step 510, ISCF send response message (200OK) to target SA, the end of the UE2 got in carrying step 509
End media surface information.
The distant end media surface information of itself, after target SA receives response message, is updated to UE2's by step 511
Media surface information, responds afterwards and answers confirmation message (ACK).
Step 512, target SA send a notification message (NOTIFY) to source SA, notify that SA switchings in source are ready to complete.
Step 513, source SA are returned after receiving notice and confirm message (200OK).
Step 514, source SA send switching command (Relocation Command) to source RNC.
Step 515, source RNC send switching command to UE1.
Step 516, UE1 switch to Target RNC, and UE1 starts the Radio Resource of access target RNC.
Step 517, after Target RNC detects UE1, sends switching probe message (Relocation to target SA
Detect)。
Step 518, after Target RNC receives the handover success message of UE1 transmissions, sends switching to target SA and completes
Message (Relocation Complete).
Step 519, target SA send a notification message (NOTIFY) to source SA, notify that SA switchings in source are completed.
Step 520, after source SA receives notification message, returns to target SA and confirms message (200OK).
Step 521, source SA notify source RNC release signalings link and bearing resource.
As can be seen that the present embodiment two equally solves two problems present in prior art from above-mentioned flow process：
1st, the present embodiment eliminates existing skill by way of directly notifying switching (step 504) to target SA from source SA
The step of switching notice is forwarded via ISCF in art, so that switching flow more simplifies, reduces prior art flow process
Complexity.
2nd, SDP (step 509) of the present embodiment by first acquisition UE2, then distal end SDP renewal (steps are carried out to target SA
510) method, has evaded switching concussion problem present in prior art.
More than, only presently preferred embodiments of the present invention is not intended to limit protection scope of the present invention.
Claims (21)
1. a kind of changing method, it is characterised in that methods described includes：
After source signaling adaptation device SA receives handover request, notify that target SA is to be cut by session initiation protocol sip message
Change user equipment (UE) and prepare resource；
Target SA prepares resource for the to be switched UE, sets up and the carrying between the source SA, and notifies the source SA
Switching is ready to complete；
The source SA notifies that the to be switched UE is switched to objective network；
Wherein, sip message is transfer request REFER message, and/or, INVITE is invited in calling；Calling invites INVITE to disappear
Breath does not include the media information of the opposite end UE of to be switched UE；
By sip message, source SA notifies that target SA is that to be switched UE preparations resource is specially：The source SA is direct by sip message
Notify target SA and prepare resource for be switched UE；Or, the source SA passes through sip message Jing integrated service control functions
Entity ISCF notifies target SA and prepares resource for be switched UE.
2. method according to claim 1, it is characterised in that carry in the sip message switching relevant parameter and/
Or switching mark.
3. method according to claim 2, it is characterised in that carry in the sip message switching relevant parameter and/
Or switching mark is specially：
The relevant parameter and/or switching mark of switching are carried in the message body of the sip message.
4. according to the method in claim 2 or 3, it is characterised in that the relevant parameter of the switching includes that switching target is little
The media coding/decoding information and current business that the information of area and target radio network controller RNC, the source SA are supported is adopted
Coding/decoding information.
5. method according to claim 2, it is characterised in that carry in the sip message switching relevant parameter and/
Or switching mark is specially：
Switching mark is carried in the message header of the sip message.
6. method according to claim 1, it is characterised in that switching mark tool is carried in the message header of the sip message
Body is：
For the REFER message, the switching mark is carried on the Route header fields or Request-URI of the REFER message
In header field.
7. method according to claim 1, it is characterised in that the source SA is by sip message and Jing ISCF notify described
Target SA is that to be switched UE preparations resource is specially：
After the source SA receives handover request, by ISCF described in REFER message informings；The ISCF is according to REFER message
In switching mark judgement need to switch over, obtain the target SA address, and by SIP session invitations INVITE notice
Target SA is that to be switched UE prepares resource.
8. method according to claim 1, it is characterised in that the ISCF obtains the target SA address and is specially：
The ISCF selects target SA according to Target cell and operator's configuration strategy；
Or, the REFER for being sent to the ISCF is carried on by source SA selection targets SA and by the address of target SA
In message, the ISCF is notified.
9. method according to claim 1, it is characterised in that methods described also includes：
After target SA receives the switching sip message that the source SA sends, need are determined according to the switching mark in sip message
Switch, handover request is sent to the Target RNC；After receiving the switching request response that the Target RNC sends, it is current
Session reserved media face resource, and notify the ISCF；
The ISCF carries the medium surface resource information of target SA with right with the to be switched UE sessions by sip message
End UE carries out medium surface negotiation, makes opposite end UE provide the medium surface that the distant end media face resource updates of itself are target SA
Source.
10. method according to claim 9, it is characterised in that the source SA by ISCF described in REFER message informings,
And by the ISCF by SIP INVITE notify target SA for be switched user equipment (UE) prepare resource when, it is described
Target SA notifies the ISCF by call proceeding message 183；
It is when the source SA notifies that target SA prepares resource for be switched UE by sip message directly or by the ISCF, described
Target SA notifies the ISCF by INVITE.
11. methods according to claim 1, it is characterised in that the source SA is by sip message and Jing ISCF notify described
When target SA is that to be switched UE prepares resource, methods described also includes：
Complete opposite end UE of target SA with the to be switched UE sessions complete IP carry set up after, the source SA is received
Switching is ready to complete notice, notifies that the source SA switching be ready to complete by sip message by the ISCF；
The source SA by sip message directly notify target SA for be switched UE prepare resource when, methods described also includes：
Complete opposite end UE of target SA with the to be switched UE sessions complete IP carry set up after, the source SA is received
Switching is ready to complete notice, notifies that the source SA switching be ready to complete by sip message by target SA.
12. methods according to claim 11, it is characterised in that methods described also includes：
After target SA receives the handoff completion message of the Target RNC, notify that SA switchings in source are completed by sip message.
13. methods according to claim 12, it is characterised in that the source SA is by sip message and Jing ISCF notify institute
When stating target SA and preparing resource for be switched UE, by sip message, target SA notifies that source SA switching completes to be specially：
Target SA sends response message 200OK to the ISCF and notifies that the ISCF switchings are completed, and the ISCF receives described
The backward source SA of the 200OK message NOTIFY that send a notification message notify that the ISCF switchings are completed；
The source SA by sip message directly notify target SA for be switched UE prepare resource when, target SA passes through
Sip message notifies that the source SA switchings complete to be specially：Target SA directly sends NOTIFY to the source SA and notifies described
SA switchings in source are completed.
A kind of 14. switched systems, are applied in wireless communication system, the switched system include source SA, source RNC, Target RNC,
Target SA, to be switched UE and the UE with to be switched UE sessions, it is characterised in that：
Source SA, for, after handover request is received, notifying that target SA is that to be switched UE prepares resource by sip message；And,
After target SA prepares resource for the to be switched UE, notify that the to be switched UE is switched to objective network；
Wherein, the sip message is transfer request REFER message, and/or, INVITE is invited in calling；The calling
Conversation media information with the opposite end UE of the to be switched UE session is not carried in INVITE；
By sip message, source SA notifies that target SA is that to be switched UE preparations resource is specially：The source SA is direct by sip message
Notify target SA and prepare resource for be switched UE；Or, the source SA passes through sip message Jing integrated service control functions
Entity ISCF notifies target SA and prepares resource for be switched UE；
Target SA, for preparing resource for the to be switched UE, sets up and the carrying between the source SA, and notifies the source SA
Switching is ready to complete.
15. systems according to claim 14, it is characterised in that the relevant parameter of switching is carried in the sip message
And/or switching mark.
16. systems according to claim 15, it is characterised in that the phase of switching is carried in the message body of the sip message
Related parameter and/or switching mark, wherein, the relevant parameter of the switching include switching target small area and Target RNC information,
The coding/decoding information that the media coding/decoding information and current business that source AG is supported is adopted.
17. systems according to claim 15, it is characterised in that switching mark is carried in the message header of the sip message.
18. systems according to any one of claim 14 to 17, it is characterised in that hold in the message header of the sip message
Carry switching mark to be specially：For the REFER message, the switching mark is carried on the Route header fields of the REFER message
Or in Request-URI header fields.
19. systems according to claim 14, it is characterised in that the source SA is further used for by sip message and Jing
ISCF notifies target SA and is specially for be switched UE preparations resource：
The source SA further after handover request is received, by ISCF described in REFER message informings；The ISCF according to
Switching mark judgement in REFER message need to be switched over, and obtain the target SA address, and pass through SIP session invitations
INVITE notifies target SA and prepares resource for be switched user equipment (UE).
20. systems according to claim 14, it is characterised in that the source SA further passes through REFER message informings institute
ISCF is stated, and target SA is notified by SIP INVITE by the ISCF and prepare resource for be switched user equipment (UE)
When, it is described.
21. systems according to claim 14, it is characterised in that the ISCF is further according to Target cell and operator
Configuration strategy selects target SA；
Or, source SA selection targets SA, and the address of target SA is carried on is sent to the REFER of the ISCF and disappears
In breath, the ISCF is notified.
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| CN101043701A (en) * | 2006-03-23 | 2007-09-26 | 华为技术有限公司 | Method for IP multimedia subsystem to provide register and call continuousness for mobile circuit domain user and system thereof |
| CN101400091A (en) * | 2007-09-30 | 2009-04-01 | 华为技术有限公司 | Method, system and device for conversion of session control signaling |
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| CN101043701A (en) * | 2006-03-23 | 2007-09-26 | 华为技术有限公司 | Method for IP multimedia subsystem to provide register and call continuousness for mobile circuit domain user and system thereof |
| CN101400091A (en) * | 2007-09-30 | 2009-04-01 | 华为技术有限公司 | Method, system and device for conversion of session control signaling |
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