CN101583123B - Handover method among packet switching domain systems, device and system - Google Patents
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Abstract
The embodiment of the invention relates to a handover method among packet switching domain systems, a device and a system. The method comprises: a BSS receives a handover request message through a first interface between the BSS and an SRNS, and the handover request message contains identification information of MS and relevant information of RAB; according to the identification information of theMS and the relevant information of the RAB, the BSS sets up a first communication link between the BSS and the SRNS and a second communication link between the BSS and the MS for the handover. In the embodiment of the invention, the BSS receives the handover request message which is sent by the SRNS and contains the identification information of the MS and the relevant information of the RAB thro ugh the first interface, and sets up the first communication link between the BSS and the SRNS and the second communication link between the BSS and the MS for the handover according to the identification information of the MS and the relevant information of the RAB. Compared with the technical proposal in the prior art, the interaction with a core network in the process of handover among the packet switching domain systems can be reduced, thus reducing signaling load of the core network and shortening time delay of the core network.
Description
Technical field
The embodiment of the invention relates to the mobile communication technology field, changing method, Apparatus and system between particularly a kind of grouping (PacketSwitching is called for short PS) domain system.
Background technology
Third generation digital communication (3rd Generation is called for short 3G) network mainly comprises Access Network and core net two parts.Broadband CDMA system (Wideband Code Division Multiple Access, be called for short WCDMA) be a kind of of 3G, its Access Network is universal mobile telecommunications system (UniversalMobile Telecommunication System, be called for short UMTS) land radio access web (UniversalMobile Telecommunication System Territorial Radio Access Network is called for short UTRAN).And the Access Network of 2.5G communication system includes but not limited to: general packet radio service (General Packet Radio Service, be called for short GPRS)/GSM evolution technology (the Enhanced Data rate for GSM Evolution of data rate improved, be called for short EDGE) wireless access network wireless access networks such as (GSM EDGE Radio Access Network are called for short GERAN).
In the prior art, can realize that UMTS switches between the PS of GPRS domain system by cell re-selection procedure.But the inventor finds that in realizing process of the present invention there is following defective in prior art:
On the one hand, Serving GPRS Support Node in the core net (Serving GPRS SupportNode, be called for short SGSN) need to pass through and source SRNS Serving Radio Network Subsystem (Serving RadioNetwork Subsystem, abbreviation SRNS) the SRNS context transfer flow process between is obtained next Packet Data Unit (the Packet Data Unit of up-downgoing transmission, be called for short PDU) sequence number, increased the signaling traffic load and the time delay for switching of system; On the other hand, the SGSN under forwarding to before the packet data package on the SRNS of source also needs is transmitted to subsystem of objective base station (Base StationSubsystem is called for short BSS) by SGSN again, has also increased time delay for switching.
Be understandable that, aforementionedly only between the PS of GPRS domain system, switch to example and be illustrated, but other 3G switch between the PS of 2.5G system domain system and also have similar problem with UMTS.
Summary of the invention
The embodiment of the invention provides changing method, the Apparatus and system between a kind of PS domain system, in order to the Signalling exchange between minimizing and the core net, realizes reducing the signaling traffic load and the time delay for switching of core net.
The embodiment of the invention provides the changing method between a kind of PS domain system, comprising:
BSS receives the handoff request message that SRNS sends by first interface between described BSS and the SRNS, carries the relevant information of identification information and the RAB of MS in the described handoff request message;
Described BSS is according to the relevant information of identification information and the described RAB of described MS, for first communication link between described BSS and the described SRNS and the second communication link between described BSS and the MS are set up in this switching.
The embodiment of the invention also provides a kind of BSS, comprising:
Receiver module, be used for by and SRNS between first interface receive the handoff request message that SRNS sends, carry the relevant information of identification information and the RAB of MS in the described handoff request message;
Set up module, be used for relevant information according to identification information and the described RAB of described MS, for the switching between the PS domain system set up and described SRNS between first communication link and and MS between the second communication link.
The embodiment of the invention provides the switched system between a kind of PS domain system again, comprises above-mentioned BSS, and the SRNS that communicates by letter with described BSS.
As shown from the above technical solution, in the embodiment of the invention, BSS receives the handoff request message of the relevant information of identification information that carries MS that SRNS sends and RAB by first interface between BSS and the SRNS, and utilize the relevant information of identification information and the RAB of this MS, for first communication link between BSS and the SRNS and the second communication link between BSS and the MS are set up in this switching.Technical scheme has compared to existing technology reduced between the PS domain system mutual in the handoff procedure and between the core net, thereby can reduce the signaling traffic load and the time delay for switching of core net.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The schematic flow sheet of the changing method between the PS domain system that Fig. 1 provides for the embodiment of the invention one;
The schematic flow sheet of the changing method between the PS domain system that Fig. 2 provides for the embodiment of the invention two;
Fig. 3 is the user face protocol stack schematic diagram of Iur-g interface in the embodiment of the invention two;
The schematic flow sheet of the changing method between the PS domain system that Fig. 4 provides for the embodiment of the invention three;
Fig. 5 is a chain of command protocol stack schematic diagram in PS territory in the embodiment of the invention three;
The structural representation of the base station sub-system that Fig. 6 provides for the embodiment of the invention four;
The structural representation of the base station sub-system that Fig. 7 provides for the embodiment of the invention five;
The structural representation of the base station sub-system that Fig. 8 provides for the embodiment of the invention six.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
In the embodiment of the invention, describe with the example that switches between the PS domain system of the travelling carriage under CELL_FACH or the CELL_DCH state (Mobile Station is called for short MS) from UMTS to GPRS.
The schematic flow sheet of the changing method between the PS domain system that Fig. 1 provides for the embodiment of the invention one, as shown in Figure 1, the changing method between the PS domain system of present embodiment can may further comprise the steps:
In the present embodiment, BSS receives the handoff request message of the relevant information of identification information that carries MS that SRNS sends and RAB by first interface between BSS and the SRNS, and utilize the relevant information of identification information and the RAB of this MS, for first communication link between BSS and the SRNS and the second communication link between BSS and the MS are set up in this switching.Changing method between the PS domain system that the technical scheme compared to existing technology, present embodiment provide has reduced between the PS domain system mutual in the handoff procedure and between the core net, thereby can reduce the signaling traffic load and the time delay for switching of core net.
The schematic flow sheet of the changing method between the PS domain system that Fig. 2 provides for the embodiment of the invention two in the present embodiment, supposes that the affiliated SGSN of SGSN and target BS S under the SRNS of source is same SGSN (switching under this kind scene the not switching of SGSN-spanning).What deserves to be explained is that the flow process of SGSN-spanning has just increased the flow process between source SGSN and target SGSN, and flow process is a prior art between SGSN, present embodiment is not described in detail.
As shown in Figure 2, the changing method between the PS domain system of present embodiment can may further comprise the steps:
Step 201, source SRNS send cell re-selection command (Cell Change Order) message to MS, and the transmission that stops current downlink grouped data bag, and the above-mentioned downlink grouped data bag of buffer memory;
In this step, the MS that carries out the PS domain data service in UMTS starts compact model when carrying out isosystem measurement, and the cycle reports the measurement report that includes adjacent GPRS cell measurement results to source SRNS.When the measurement result that has GPRS sub-district (being switching target small area) satisfies the trigger condition of sub-district gravity treatment, source SRNS can send cell re-selection command (Cell Change Order) message to MS, starting different system with order MS switches, and stop the transmission of current downlink grouped data bag and the above-mentioned downlink grouped data bag of buffer memory.Wherein, the above-mentioned trigger condition that satisfies the sub-district gravity treatment preestablishes, for example: the received signal intensity indication of GPRS sub-district (Received Signal Strength Indicator is called for short RSSI) when surpassing the threshold value of system definition, is considered as satisfying the sub-district reselection conditions.
Step 202, source SRNS send handoff request (HandoverRequest) message by the Iur-g interface to target BS S, carry the relevant information of identification information and the RAB of MS in this handoff request message;
Wherein, the identification information of MS can be the Temporary Mobile Station Identity (P-TemporaryMobile Station Identity is called for short P-TMISI) in PS territory.
Wherein, the relevant information of RAB can comprise: RAB sign, RAB service quality (Quality ofService is called for short QoS) parameter, parameters such as transport layer address.
Step 203, target BS S receive handoff request message, set up first communication link between target BS S and the source SRNS and the second communication link between target BS S and the MS according to the identification information of the relevant information of RAB and MS;
In this step, above-mentioned first communication link that target BS S set up and above-mentioned second communication link can be used for the Signalling exchange of the follow-up routing region updating that carries out, particularly, target BS S can carry out the Signalling exchange of routing region updating by above-mentioned first communication link, above-mentioned second communication link respectively with source SRNS, MS, after routing region updating was finished, target BS S then sent handover acknowledge message by above-mentioned first communication link (connection of Iur-g interface) to source SRNS.
Step 214, target BS S send handover acknowledge (HandoverAcknowledge) message by first communication link (connection of Iur-g interface) to source SRNS after routing region updating is finished;
Step 215, source SRNS receive handover acknowledge message, send the downlink grouped data bag of buffer memory to target BS S by first communication link;
In the above-mentioned steps 202, source SRNS can also carry the context of SRNS by the Iur-g interface in the handoff request message that target BS S is sent, send this downlink grouped data bag for target BS S by second communication chain road direction MS.This SRNS context has been preserved next with GPRS Tunnel Protocol (the GPRS Tunneling Protocol that is transmitted, be called for short GTP) Packet Data Unit (Packet DataUnit, be called for short PDU) sequence number, for harmless PDCP (Packet DataConvergence Protocol, be called for short PDCP) process, the next PDCP sequence number that is transmitted also preserved in the SRNS context.
In the present embodiment, target BS S receives after the handoff request message, sets up first communication link between target BS S and the source SRNS and the second communication link between target BS S and the MS according to the relevant information of the identification information of MS entrained in this handoff request message and RAB.Target BS S and MS, source SRNS are mutual, then source SRNS is mutual with SGSN again, by second communication link, first communication link and third communication link transfer MS and the related news of SGSN in the routing region updating flow process, to finish routing region updating, routing update success back target BS S returns handover acknowledge message to source SRNS.Afterwards, source SRNS sends the downlink grouped data bag of its buffer memory by first communication link to target BS S, and target BS S sends the downlink grouped data bag by second communication chain road direction MS.
In the present embodiment, by the target BS S of foundation and first communication link between the SRNS of source, source SRNS can be directly and target BS S carry out Signalling exchange, and need not by affiliated SGSN, reduce between the PS domain system mutual in the handoff procedure and between the core net, thereby can reduce the signaling traffic load and the time delay for switching of core net; By the target BS S of foundation and first communication link between the SRNS of source, the downlink grouped data bag on the SRNS of source can directly transfer to target BS S by this first communication link, and the SGSN under forwarding to before need not has further reduced time delay for switching.
Among the invention described above embodiment two, by signaling plane (signaling plane of first communication link) Radio Network Subsystem Application Part (Radio NetworkSubsystem Application Part to the Iur-g interface between source SRNS and the target BS S, abbreviation RNSAP) agreement is expanded, to support the transmission of above-mentioned handoff request message and handover acknowledge message.In addition, can also be by user's face (user's face of first communication link) of the Iur-g interface that increases newly, directly hand to target BS S with the downlink grouped data bag of supporting institute's buffer memory on the SRNS of source, and after switching, the ascending packet data bag of MS directly connects by the Iur-g interface hands to SGSN by source SRNS.Fig. 3 is the user face protocol stack schematic diagram of Iur-g interface in the embodiment of the invention two, as shown in Figure 3, its processing protocol is GPRS Tunnel Protocol (the GPRS Tunneling Protocol for the user plane of user's face, be called for short GTP-U), can go up configuration GTP-U layer, UDP layer, IP layer, L2 layer and L1 layer at BSS and SRNS (both interfaces are the Iur-g interface), the concrete agreement that adopts can comprise GTP-U agreement, udp protocol, IP agreement, L2 agreement and L1 agreement, for example: can be GTP-U/UDP/IP/L2/L1 from top to bottom.Wherein, target BS S need support the processing of 2G network user's face, the logic link control that originally on SGSN, realizes (Logic Link Control, be called for short LLC)/the relevant convergence protocol of subnet (SubNetworkDependent Convergence Protocol is called for short SNDCP) protocol function need be displaced downwardly to target BS S and realize.In the protocol processes process of target BS S, SNDCP will be correlated with from the subnet of LLC layer and transfer to the GTP-U processing as network protocol packet data unit (N-PDU) after convergence protocol Packet Data Unit (SN-PDU) compresses.
The schematic flow sheet of the changing method between the PS domain system that Fig. 4 provides for the embodiment of the invention three in the present embodiment, supposes that the affiliated SGSN of SGSN and target BS S under the SRNS of source is same SGSN (switching under this kind scene the not switching of SGSN-spanning).What deserves to be explained is that the flow process of SGSN-spanning has just increased the flow process between source SGSN and target SGSN, and flow process is a prior art between SGSN, present embodiment is not described in detail.
As shown in Figure 4, the changing method between the PS domain system of present embodiment can may further comprise the steps:
Step 401, source SRNS send cell re-selection command message to MS, and the transmission that stops current downlink grouped data bag, and the above-mentioned downlink grouped data bag of buffer memory;
In this step, the MS that carries out the PS domain data service in UMTS starts compact model when carrying out isosystem measurement, and the cycle reports the measurement report that includes adjacent GPRS cell measurement results to source SRNS.When the measurement result that has GPRS sub-district (being switching target small area) satisfies the trigger condition of sub-district gravity treatment, source SRNS can send cell re-selection command message to MS, starting different system with order MS switches, and stop the transmission of current downlink grouped data bag and the above-mentioned downlink grouped data bag of buffer memory.Wherein, the above-mentioned trigger condition that satisfies the sub-district gravity treatment preestablishes, for example: when the RSSI of GPRS sub-district surpasses the threshold value of system definition, be considered as satisfying the sub-district reselection conditions.
Step 402, source SRNS send handoff request message by the Iur-g interface to target BS S, carry the relevant information of identification information and the RAB of MS in this handoff request message;
Wherein, the identification information of MS can be P-TMISI.
Wherein, the relevant information of RAB can comprise RAB sign, RAB qos parameter, parameters such as transport layer address.
Step 403, target BS S receive handoff request message, set up first communication link between target BS S and the source SRNS and the second communication link between target BS S and the MS according to the identification information of the relevant information of RAB and MS;
In this step, the above-mentioned second communication link that target BS S set up can be used for the Signalling exchange of routing region updating, and can set up the four-way letter link between target BS S and the SGSN in the subsequent step, particularly, target BS S can carry out the Signalling exchange of routing region updating by above-mentioned second communication link, above-mentioned four-way letter link respectively with MS, SGSN, after routing region updating was finished, target BS S sent handover acknowledge message by above-mentioned first communication link (connection of Iur-g interface) to source SRNS.
Step 404, MS receive cell re-selection command message, send the routing region updating request message by above-mentioned second communication chain road direction target BS S, carry the identification information of MS in the above-mentioned routing region updating request message;
Step 405, target BS S receive the routing region updating request message, set up target BS S and believe link (Iu-PS interface is connected) with the four-way between the SGSN, and transmit this routing region updating request message by newly-built above-mentioned four-way letter chain road direction SGSN;
Step 406, SGSN receive the routing region updating request message, and MS is after new Routing Area is legal, for MS sets up mobile management (MM) context and packet data protocol (PDP) context in checking;
Step 407, SGSN return routing region updating by four-way letter link (Iu-PS interface connection) to target BS S and accept message;
Step 408, target BS S receive routing region updating and accept message, send this routing region updating by second communication chain road direction MS and accept message;
Step 409, MS receive routing region updating and accept message, send routing region updating by second communication chain road direction target BS S and finish message;
Step 410, target BS S receive routing region updating and finish message, transmit this routing region updating by above-mentioned four-way letter link (Iu-PS interface connection) to SGSN and finish message;
Step 411, target BS S send handover acknowledge message by first communication link (connection of Iur-g interface) to source SRNS after routing region updating is finished;
Step 412, source SRNS receive handover acknowledge message, send the downlink grouped data bag of buffer memory to target BS S by first communication link;
Step 413, target BS S receive the downlink grouped data bag, send the downlink grouped data bag according to the context of above-mentioned source SRNS by second communication chain road direction MS.
In the above-mentioned steps 402, source SRNS can also carry the context of SRNS by the Iur-g interface in the handoff request message that target BS S is sent, send this downlink grouped data bag for target BS S by second communication chain road direction MS.This SRNS context has been preserved next with the GTPPDU sequence number that is transmitted, and for harmless PDCP process, the next PDCP sequence number that is transmitted also preserved in the SRNS context.
In the present embodiment, target BS S receives after the handoff request message, sets up first communication link between target BS S and the source SRNS and the second communication link between target BS S and the MS according to the relevant information of the identification information of MS entrained in this handoff request message and RAB.Target BS S and MS, SGSN carry out alternately, the target BS S that sets up by second communication link and target BS S believes link (Iu-PS interface is connected) transfer MS and the related news of SGSN in the routing region updating flow process with the four-way between the SGSN, to finish routing region updating, routing update success back target BS S returns handover acknowledge message to source SRNS.Afterwards, source SRNS sends the downlink grouped data bag of its buffer memory by first communication link to target BS S, and target BS S sends the downlink grouped data bag by second communication chain road direction MS.
In the present embodiment, by the target BS S of foundation and first communication link between the SRNS of source, source SRNS can be directly and target BS S carry out Signalling exchange, and need not by affiliated SGSN, reduce between the PS domain system mutual in the handoff procedure and between the core net, thereby can reduce the signaling traffic load and the time delay for switching of core net; By the target BS S of foundation and first communication link between the SRNS of source, the downlink grouped data bag on the SRNS of source can directly transfer to target BS S by this first communication link, and the SGSN under forwarding to before need not has further reduced time delay for switching.
Compare with the invention described above embodiment two, routing region updating flow process in the present embodiment is finished alternately by target BS S and MS, SGSN, and source SRNS goes up the downlink grouped data bag of buffer memory and remains and transmit by first communication link and second communication link, thereby the characteristic that the carrying that has realized the PS territory separates with control, support the difference dilatation of chain of command and user's face, increased the flexibility of networking.
Fig. 5 is a chain of command protocol stack schematic diagram in PS territory in the embodiment of the invention three, as shown in Figure 5, can go up configuration LLC layer, Radio Link control (RLC) layer, media interviews controls (MAC) layer and physical radio (RF) layer at MS and BSS (both interfaces are Um Interface), the concrete agreement that adopts can comprise LLC agreement, rlc protocol, MAC agreement and RF agreement, for example: can be LLC/RLC/MAC/RF from top to bottom; Can go up configuration Radio Access Network Application Part (Radio Access Network Application Part at SGSN and BSS (both interfaces are Iu-PS interface), be called for short RANAP) layer, SCCP (Signaling Conne ction Control Part, be called for short SCCP) layer, signaling bear (Signaling Bearer) layer, L2 layer and L1 layer, the concrete agreement that adopts can comprise RANAP, SCCP, Signaling Bearer agreement, L2 agreement and L1 agreement, for example: can be RANAP/SCCP/SignalingBearer/L2/L1 from top to bottom.Among the invention described above embodiment three, by the unification of the Gb Interface signaling between the SGSN of target BS S and core net is the Iu-PS interface signaling, target BS S and MS, SGSN are mutual, be connected transfer MS and the related news of SGSN in the routing region updating flow process by the Iu-PS interface between the SGSN of second communication link and above-mentioned target BS S and core net, to finish routing region updating.
Need to prove: the invention described above embodiment only is illustrated the transmission of the downlink grouped data bag on the source SRNS in the handoff procedure between the PS domain system from UMTS to GPRS, after successfully switching to GPRS, the transmission of the ascending packet data bag of MS is identical with the communication link of downlink grouped data bag transmission, just direction is opposite, repeats no more herein.
Need to prove: for aforesaid each method embodiment, for simple description, so it all is expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not subjected to the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in the specification all belongs to preferred embodiment, and related action and module might not be that the present invention is necessary.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, do not have the part that describes in detail among certain embodiment, can be referring to the associated description of other embodiment.
The structural representation of the base station sub-system that Fig. 6 provides for the embodiment of the invention four, as shown in Figure 6, the base station sub-system of present embodiment can comprise receiver module 61 and set up module 62.Wherein, receiver module 61 by and SRNS between first interface receive the handoff request message that SRNS sends, carry the relevant information of identification information and the RAB of MS in the above-mentioned handoff request message, set up the relevant information of module 62 according to identification information and the above-mentioned RAB of above-mentioned MS, for the switching between the PS domain system set up and SRNS between first communication link and and MS between the second communication link.
Among the invention described above embodiment one in BSS, the embodiment of the invention two in BSS and the embodiment of the invention three function of BSS all can realize by the BSS that present embodiment provides.
In the present embodiment, receiver module receives the handoff request message of the relevant information of identification information that carries MS that SRNS sends and RAB by first interface between BSS and the SRNS, and utilize the relevant information of identification information and the RAB of this MS by setting up module, for switching first communication link set up between BSS and the SRNS and the second communication link between BSS and the MS between this PS domain system.The BSS that technical scheme compared to existing technology, present embodiment provide has reduced between the PS domain system mutual in the handoff procedure and between the core net, thereby can reduce the signaling traffic load and the time delay for switching of core net.
The structural representation of the base station sub-system that Fig. 7 provides for the embodiment of the invention five, as shown in Figure 7, set up the Signalling exchange that above-mentioned first communication link that module 62 set up and above-mentioned second communication link are used for routing region updating in the present embodiment, the BSS of present embodiment can further include first update module 71 and first responder module 72.Wherein, first update module 71 is carried out the Signalling exchange of routing region updating respectively with SRNS, MS by above-mentioned first communication link of being set up of setting up module 62, above-mentioned second communication link, first responder module 72 sends handover acknowledge message by above-mentioned first interface to SRNS after routing region updating is finished.
In the present embodiment, first update module and MS, source SRNS are mutual, by setting up second communication link and the first communication link transfer MS and the related news of SGSN in the routing region updating flow process that module is set up, to finish routing region updating.
Further, also carry the context of SRNS in the received above-mentioned handoff request message of receiver module 61, the BSS of present embodiment can further include first and transmits module 73, be used for context according to above-mentioned SRNS, receive the downlink grouped data bag of its buffer memory that SRNS sends by above-mentioned first communication link of setting up module 62 and being set up, and send above-mentioned downlink grouped data bag to above-mentioned MS by setting up the above-mentioned second communication link that module 62 set up.
In the present embodiment, by setting up target BS S that module sets up and first communication link between the SRNS of source, source SRNS can be directly and target BS S carry out Signalling exchange, and need not by affiliated SGSN, reduce between the PS domain system mutual in the handoff procedure and between the core net, thereby can reduce the signaling traffic load and the time delay for switching of core net; By setting up target BS S that module sets up and first communication link between the SRNS of source, the downlink grouped data bag on the SRNS of source can directly transfer to target BS S by this first communication link, and the SGSN under forwarding to before need not has reduced time delay for switching.
The structural representation of the base station sub-system that Fig. 8 provides for the embodiment of the invention six, as shown in Figure 8, set up the Signalling exchange that above-mentioned second communication link that module 62 set up is used for routing region updating in the present embodiment, and have four-way letter link between BSS and the SGSN, the BSS of present embodiment can further include second update module 81 and second responder module 82.Wherein, second update module 81 is carried out the Signalling exchange of routing region updating respectively with MS, SGSN by the above-mentioned second communication link of being set up of setting up module 62, above-mentioned four-way letter link, second responder module 82 sends handover acknowledge message by above-mentioned first interface to SRNS after routing region updating is finished.
In the present embodiment, second update module and MS, SGSN carry out alternately, by setting up four-way letter link (Iu-PS interface is connected) transfer MS and the related news of SGSN in the routing region updating flow process between target BS S that second communication link that module sets up and target BS S set up and the SGSN, to finish routing region updating.Compare with the invention described above embodiment five, second update module in the present embodiment is the routing region updating flow process by finishing alternately with MS, SGSN, and source SRNS goes up the downlink grouped data bag of buffer memory and remains and transmit by first communication link and second communication link, thereby the characteristic that the carrying that has realized the PS territory separates with control, support the difference dilatation of chain of command and user's face, increased the flexibility of networking.
Further, also carry the context of SRNS in the received above-mentioned handoff request message of receiver module 61, the BSS of present embodiment can further include first and transmits module 83, be used for context according to above-mentioned SRNS, receive the downlink grouped data bag of its buffer memory that SRNS sends by above-mentioned first communication link of setting up module 62 and being set up, and send above-mentioned downlink grouped data bag to above-mentioned MS by setting up the above-mentioned second communication link that module 62 set up.
In the present embodiment, by setting up target BS S that module sets up and first communication link between the SRNS of source, source SRNS can be directly and target BS S carry out Signalling exchange, and need not by affiliated SGSN, reduce between the PS domain system mutual in the handoff procedure and between the core net, thereby can reduce the signaling traffic load and the time delay for switching of core net; By setting up target BS S that module sets up and first communication link between the SRNS of source, the downlink grouped data bag on the SRNS of source can directly transfer to target BS S by this first communication link, and the SGSN under forwarding to before need not has reduced time delay for switching.
The embodiment of the invention can also provide the switched system between a kind of PS domain system, comprises the BSS that the invention described above embodiment four, the embodiment of the invention five and the embodiment of the invention six provide, and the SRNS that communicates by letter with above-mentioned BSS.Wherein, SRNS can comprise sending module, be used for by and BSS between first interface send above-mentioned handoff request message to BSS.Can also further carry the context of SRNS in the above-mentioned handoff request message, correspondingly, SRNS can further include second and transmits module, is used for above-mentioned first communication link that module sets up sends the downlink grouped data bag from its buffer memory to BSS of setting up by BSS.
In the present embodiment, target BS S that is set up by target BS S and first communication link between the SRNS of source, source SRNS can be directly and target BS S carry out Signalling exchange, and need not by affiliated SGSN, reduce between the PS domain system mutual in the handoff procedure and between the core net, thereby can reduce the signaling traffic load and the time delay for switching of core net; Target BS S that is set up by target BS S and first communication link between the SRNS of source, the downlink grouped data bag on the SRNS of source can directly transfer to target BS S by this first communication link, and the SGSN under forwarding to before need not has reduced time delay for switching.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. the changing method between a grouping domain system is characterized in that, comprising:
Subsystem of objective base station carries the relevant information of the identification information and the RAB of travelling carriage by the handoff request message that the first interface reception sources SRNS Serving Radio Network Subsystem between described subsystem of objective base station and the source SRNS Serving Radio Network Subsystem sends in the described handoff request message;
Described subsystem of objective base station is according to the relevant information of the identification information and the described RAB of described travelling carriage, for first communication link between described subsystem of objective base station and the described source SRNS Serving Radio Network Subsystem and the second communication link between described subsystem of objective base station and the travelling carriage are set up in this switching; Wherein:
Described first communication link and described second communication link are used for the Signalling exchange of routing region updating; Described method also comprises:
Described subsystem of objective base station carries out the Signalling exchange of routing region updating respectively with described source SRNS Serving Radio Network Subsystem, described travelling carriage by described first communication link, described second communication link;
After routing region updating was finished, described subsystem of objective base station sent handover acknowledge message by described first communication link to described source SRNS Serving Radio Network Subsystem;
Perhaps
Described second communication link is used for the Signalling exchange of routing region updating, and has four-way letter link between described subsystem of objective base station and the service universal grouping wireless serving GPRS support node; Described method also comprises:
Described subsystem of objective base station carries out the Signalling exchange of routing region updating respectively with described travelling carriage, described service universal grouping wireless serving GPRS support node by described second communication link, described four-way letter link;
After routing region updating was finished, described subsystem of objective base station sent handover acknowledge message by described first communication link to described source SRNS Serving Radio Network Subsystem.
2. method according to claim 1 is characterized in that, also carries the context of active SRNS Serving Radio Network Subsystem in the described handoff request message, and described method also comprises:
Described subsystem of objective base station is according to the context of described source SRNS Serving Radio Network Subsystem, receive the downlink grouped data bag of described source SRNS Serving Radio Network Subsystem, and send described downlink grouped data bag by the described travelling carriage of described second communication chain road direction by its buffer memory of described first communication link transmission.
3. method according to claim 2 is characterized in that, described first interface is the Iur-g interface, and the processing protocol of described first communication link is the general packet radio service tunnel agreement of user's face.
4. a subsystem of objective base station is characterized in that, comprising:
Receiver module, be used for by and the source SRNS Serving Radio Network Subsystem between the handoff request message that sends of the first interface reception sources SRNS Serving Radio Network Subsystem, carry the relevant information of the identification information and the RAB of travelling carriage in the described handoff request message;
Set up module, be used for relevant information according to the identification information and the described RAB of described travelling carriage, for the switching between grouping domain system set up and described source SRNS Serving Radio Network Subsystem between first communication link and and travelling carriage between the second communication link; Wherein:
Described first communication link and described second communication link are used for the Signalling exchange of routing region updating; Described subsystem of objective base station also comprises:
First update module is used for carrying out with described source SRNS Serving Radio Network Subsystem, described travelling carriage respectively by described first communication link, described second communication link the Signalling exchange of routing region updating;
First responder module after being used for routing region updating and finishing, sends handover acknowledge message by described first communication link to described source SRNS Serving Radio Network Subsystem;
Perhaps
Described second communication link is used for the Signalling exchange of routing region updating, and has four-way letter link between described subsystem of objective base station and the service universal grouping wireless serving GPRS support node; Described subsystem of objective base station also comprises:
Second update module is used for believing that by described second communication link, described four-way link carries out the Signalling exchange of routing region updating respectively with described travelling carriage, described service universal grouping wireless serving GPRS support node;
Second responder module after being used for routing region updating and finishing, sends handover acknowledge message by described first communication link to described source SRNS Serving Radio Network Subsystem.
5. subsystem of objective base station according to claim 4 is characterized in that, also carries the context of active SRNS Serving Radio Network Subsystem in the described handoff request message, and described subsystem of objective base station also comprises:
First transmits module, be used for context according to described source SRNS Serving Radio Network Subsystem, receive the downlink grouped data bag of described source SRNS Serving Radio Network Subsystem, and send described downlink grouped data bag by the described travelling carriage of described second communication chain road direction by its buffer memory of described first communication link transmission.
6. the switched system between a grouping domain system is characterized in that, comprise as claim 4 or 5 described subsystem of objective base station, and the source SRNS Serving Radio Network Subsystem of communicating by letter with described subsystem of objective base station; Wherein,
Described source SRNS Serving Radio Network Subsystem comprises sending module, be used for by and described subsystem of objective base station between first interface send described handoff request message to described subsystem of objective base station.
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| CN2009100872979A CN101583123B (en) | 2009-06-15 | 2009-06-15 | Handover method among packet switching domain systems, device and system |
| PCT/CN2010/073745 WO2010145490A1 (en) | 2009-06-15 | 2010-06-10 | Method, apparatus and system for handoff between systems in packet domains |
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| CN100484267C (en) * | 2006-03-29 | 2009-04-29 | 华为技术有限公司 | SRNS migrating method based on mobile network multicast service data |
| CN101150838B (en) * | 2006-09-18 | 2010-06-23 | 大唐移动通信设备有限公司 | A method and system for inter-system switching |
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