CN100461951C - A method and device for multicast switching - Google Patents
A method and device for multicast switching Download PDFInfo
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- CN100461951C CN100461951C CNB2005101159232A CN200510115923A CN100461951C CN 100461951 C CN100461951 C CN 100461951C CN B2005101159232 A CNB2005101159232 A CN B2005101159232A CN 200510115923 A CN200510115923 A CN 200510115923A CN 100461951 C CN100461951 C CN 100461951C
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Abstract
The disclosed multicast switching method comprises: when UE moves from source BS to target BS, the source BS sends information to target BS to trigger switch preparation process; the information detection device of target BS detects switching request from source BS to send information to the information extraction device, the latter extracts IP address of the registered multicast router to transfer to the register; the latter sends register request to the router; meanwhile, the target BS builds UE loading with service gateway of source BS, allocates resource to UE when receiving registered data duplicate and sends switching command to source BS; finally, the source BS terminates the preparation and triggers to execute switching process.
Description
Technical field
The present invention relates to a kind of mobile communication system, relate in particular to a kind of multicast switching method and equipment in the mobile communication system.
Background technology
UMTS is the 3-G (Generation Three mobile communication system) that adopts the WCDMA air interface technologies, is called universal mobile telecommunications system, also the UMTS system is called the WCDMA communication system usually.The UMTS system has adopted and the similar structure of second generation mobile communication system, comprise Radio Access Network (Radio AccessNetwork, RAN) and core network (Core Network, CN).Wherein, Radio Access Network is used to handle all and wireless function associated, and CN handles that all voice calls are connected with data in the UMTS system, and the exchange of realization and external network and routing function.CN from be divided in logic circuit commutative field (Circuit Switched Domain, CS) and packet-switched domain (Packet Switched Domain, PS).(User Equipment UE) has constituted whole UMTS system together for UTRAN, CN and subscriber equipment.Its system configuration as shown in Figure 1.
UTRAN is a land radio access web, and it comprises one or several RNS (RNS).A RNS is made up of a radio network controller (RNC) and one or more base station (NodeB).Interface between RNC and the CN is the Iu interface, and NodeB is connected by Iub interface with RNC.In UTRAN inside, interconnected by Iur between the radio network controller (RNC), Iur can be that the direct physical between the RNC connects or the connection by transmission network.RNC is used for distributing and is attached thereto with control or the Radio Resource of relevant NodeB.NodeB then finishes the conversion of the data flow between Iub interface and the Uu interface, also participates in a part of RRM simultaneously.The structure of UTRAN is as shown in Figure 2:
NodeB is the base station (being radio receiving-transmitting unit) of WCDMA system, comprises radio receiving-transmitting unit and Base-Band Processing parts.By the Iub interface and the RNC interconnection of standard, mainly finish the processing of Uu interface physical layer protocol.Its major function is spread spectrum, modulation, chnnel coding and despreading, demodulation, channel-decoding, also comprises the functions such as mutual conversion of baseband signal and radiofrequency signal.
RNC is a radio network controller, is used to control the Radio Resource of UTRAN, mainly finishes functions such as connection foundation and disconnection, switching, the merging of grand diversity, RRM control.Specific as follows:
(1) executive system information broadcast and system's access control function;
(2) switching and RNC migration mobile management functions such as (Relocation are also referred to as reorientation);
(3) RRM and controlled function such as grand diversity merging, power control, radio bearer distribution.
3GPP considers the competitiveness of future network, is considering that at present network in this how evolution in future, has a variety of evolution schemes to launch discussion at 3GPP.The purpose of network evolution is to be desirable to provide a kind of low time delay, high data rate, high power system capacity and covering, low cost, complete IP-based network.
Network evolution has multiple candidate scheme, and wherein popular have a two-layer node network architecture.Fig. 3 illustrates a kind of existing two-layer node network architecture, and under this framework, wireless base station, edge (ERS, EdgeRadio Station) is the Node B after the evolution, has most of function of former RNC, and takes new physical-layer techniques, such as OFDM; IP IAD (IAGW, IP Access Gateway) has the function of part SGSN and the function of former GGSN.Between ERS and IAGW, then adopt the tunnel related protocol of GPRS Tunnel Protocol user face (GTP-U).
Below with reference to Fig. 4, be described in a kind of existing double playing switching method under the above-mentioned two-layer node framework.
In evolution architecture, ERS directly inserts IAGW, if want to realize between ERS the soft handover of employing macro diversity mode, only adopts two modes of broadcasting at the IAGW place, sends data to wireless base station, edge, source (SERS) and object edge wireless base station (TERS) respectively.
In step 401, UE periodically sends the measurement report of the signal quality of cell-of-origin and neighbor cell to SERS.
In step 402, SERS needs to switch to TERS according to collected measurement data judgement UE.Because in evolution architecture, no Iur interface can't exchange data between SERS and TERS.SERS sends transmission link to IAGW and sets up requirement (TL Setup Required) message, triggers handoff procedure.
In step 403, after IAGW receives TL Setup Required message, send transmission link and set up request (TL Setup Request) message to TERS, request TERS is a UE preassignment resource needed.
In step 404, after TERS receives TL Setup Request message, start relevant resource allocator, set up RRC connection, RAB (RAB), this process comprises the steps: to set up PDCP/Radio Link control/medium access control (PDCP/RLC/MAC) entity, set up new Radio Link, and be enabled in transmission and reception on the new Radio Link; Startup is simultaneously set up the GTP-U passage (GTP-U Tunnels for PS RABs) that is used for packet switching RAB and is come transmission bearer, sets up the user plane bearer between TERS and the IAGW.After all essential resources become the distribution of work, TERS will send transmission link and set up response (TL Setup Response) message to IAGW, confirm the resource allocation success.
In step 405, receive TL Setup Response message after, the data that IAGW will mail to SERS are duplicated portion, issue TERS by the GTP-U passage between newly-established and TERS.The collaborative function of finishing diversity transmission of TERS and SERS.IAGW sends transmission link foundation and finishes (TL Setup Complete) message to SERS simultaneously, and notice SERS triggers the implementation of soft handover.
In step 406, after receiving TL Setup Complete message, SERS stops the soft handover set-up procedure, and carries out following operation: SERS and send activating set updating (Active Set Update) message to UE, and the notice UE Radio Link that TERS is newly-built adds its Active Set.
In step 407, receive Active Set Update message after, the information that UE will provide according to this message is reshuffled interface-free resources, and new Radio Link is added Active Set.After UE successfully inserts Target cell, will send activating set updating and finish (Active Set Update Complete) message, notice SERS handover success.
Because as the IAGW of core net node and the radio access node ERS segment distance very far away of often being separated by, therefore directly adopt IAGW to carry out two broadcasting, the branch two paths of data sends to UE by SERS and TERS respectively, can affect to transmission resource of network.
Summary of the invention
At the above-mentioned problems in the prior art, the invention provides a kind of multicast switching method and equipment.
On the one hand, a kind of multicast switching method is proposed.When a subscriber equipment (UE) from source base station when target BS moves, the method comprising the steps of: A, determine that according to the measurement data that obtains UE needs when target BS switches when source base station, source base station triggers the switching set-up procedure to target BS transmission handoff request message; B, in switching set-up procedure, target BS is set up the user plane bearer between the gateway with source base station, the multicast router under source base station is registered simultaneously; C, when target BS receives that its multicast router of registering mails to the copy of data of source base station, for this subscriber equipment (UE) distributes resource requirement and sends switching command to source base station being allocated successfully the back; D, source base station are received after the switching command, stop switching set-up procedure and triggering hand-off execution process.
Above-mentioned steps B further comprises: according to the handoff request message of receiving from source base station, set up between target BS and this gateway with identical user plane bearer between source base station and gateway.
Above-mentioned handoff request message contains the IP address of source base station gateway and source base station be that current business is distributed and gateway between the GTP tunnel sign of GTP passage.
Above-mentioned handoff request message also comprises User Datagram Protoco (UDP) udp port sign.
Above-mentioned steps B further comprises: target BS is according to the multicast router registration of the handoff request message of receiving from source base station under source base station.
Above-mentioned handoff request message contains the IP address of the multicast router that source base station registers.
Above-mentioned steps C further comprises: multicast router duplicates portion with the data that mail to source base station and mails to target BS after receiving the register requirement that target BS sends.
The hand-off execution process of above-mentioned steps D further comprises: source base station sends activating set updating message to this subscriber equipment (UE), and subscriber equipment (UE) receives that the Radio Link of after this message target BS being built adds its Active Set.
The hand-off execution process of above-mentioned steps D further comprises: when described when switching to soft handover, when the Radio Link that subscriber equipment (UE) is built target BS adds its Active Set, the Radio Link of source base station is retained in the Active Set.
The hand-off execution process of above-mentioned steps D further comprises:, when the Radio Link that subscriber equipment (UE) is built target BS adds its Active Set, the Radio Link of source base station is deleted from Active Set when switching to direct-cut operation when described.
Said method comprises also after step: E, the finishing switching that target BS is switched to the elite tree of shortest path by shared tree according to the beta pruning flow process.
In the said method, base station and gateway are respectively wireless base station, edge (ERS) and the IP IADs (IAGW) under the two-layer node network architecture.
On the other hand, a kind of multicast switching device is proposed.For the subscriber equipment that moves to target BS from source base station (UE), this equipment is positioned on the target BS, comprise: the message detection device is used to detect message of the base station at its place receiving and the handoff request message that detected source base station is sent and sends to information extracting device; Information extracting device is used for the IP address of the multicast router registered from the handoff request message extraction source base station of receiving and sends to the multicast registration device; The multicast registration device, register requirement is sent to the multicast router of correspondence in the IP address that is used for the multicast router registered according to source base station.
In the said equipment, the base station is the wireless base station, edge (ERS) under the two-layer node network architecture.
Advantage and characteristics that the present invention is main are as follows:
1. adopt the multicast mode to switch and overcome existing procedure taking effectively transmission bandwidth.
2. for the business that transfer by telegram for receiving, only there is downlink data in this class of video request program, technical scheme of the present invention has shielded the switching of UE between ERS to IAGW, has reduced the signaling traffic between ERS and the IAGW, has reduced the live load of IAGW effectively.
Description of drawings
Fig. 1 is the structural representation of UMTS system;
Fig. 2 is the schematic network structure of UTRAN;
Fig. 3 illustrates a kind of existing two-layer node network evolution architecture;
Fig. 4 is the flow chart of a kind of existing double playing switching method under the two-layer node framework;
Fig. 5 illustrates the application architecture according to the described multicast switching flow of one embodiment of the invention;
Fig. 6 is the flow chart of the described multicast switching method of one embodiment of the invention;
Fig. 7 is the structural representation of the described multicast switching device of one embodiment of the invention.
Embodiment
Because technical scheme of the present invention adopts the switching mode based on the IP multicast, so the application architecture of the multicast switching flow employing transmission network of forming by multicast router as shown in Figure 5.And, suppose between SERS in this technical scheme application architecture and the TERS to have interface, can exchange data.Downlink data between IAGW and the UE sends to the SERS that UE is stationed by the multicast tree with specific multicast address sign.By there is the position of a plurality of multicast dispense path the subordinate, the multicast router duplicated multicast grouping that is the position existence of multicast dispense path difference also only sends to the multicast dispense path that needs distribution, the traffic on the multicast dispense path can be increased to required more than, can effectively utilize the network bandwidth.
Below, an embodiment of the multicast switching method that the present invention proposes is described with reference to Fig. 6.When UE is constantly moved to TERS by SERS in communication process, the radio link quality between UE and SERS constantly worsens.SERS needs to switch to TERS according to collected measurement data judgement UE, and sends handoff request (Handover Required) message to TERS, triggers handoff procedure.
In step 601, SERS needs to switch to TERS according to collected measurement data judgement UE.SERS sends Handover Required message to TERS, triggers handoff procedure.IP address, SERS that this message comprises the service IAGW of SERS are the GTP tunnel sign this time traffic assignments and that serve the GTP passage between IAGW and the IP address of the multicast router that SERS registered, and can also comprise the information of User Datagram Protoco (UDP) (UDP) port and other needs.
In step 602, after TERS receives handoff request, application SERS identifies by IP address and the GTP tunnel of the service IAGW that Handover Required message is sent, also need to use the udp port that comprises in this message number in some cases, startup is set up the GTP-U passage (GTP-U Tunnels for PS RABs) that is used for packet switching RAB and is come transmission bearer, same user plane bearer between setting up with SERS and IAGW between TERS and the IAGW.TERS initiates register requirement (Multicast Group Join) according to the IP address of the multicast router that SERS registered to this router (Router) simultaneously.
In step 603, multicast router (Router) duplicates portion with the data that mail to SERS after receiving the log-on message that TERS sends, and (Multicast IP Flow) mails to TERS by the IP multicast data flow.
In step 604, TERS starts relevant resource allocator after receiving the data that the multicast router (Router) of its registration sends, and is that UE distributes the required radio bearer of eating dishes without rice or wine, and is enabled in transmission and reception on the new Radio Link.After all essential resources become the distribution of work, TERS will send switching command (Handover Command) message to SERS, confirm the resource allocation success, and notice SERS triggers the implementation of soft handover.At this moment, SERS and TERS transmit the processing mode of data in full accord for the multicast router (Router) of their registrations.
In step 605, receive after the Handover Command message, SERS stops the soft handover set-up procedure, and carries out following operation: SERS and send activating set updating (Active Set Update) message to UE, and the notice UE Radio Link that TERS is newly-built adds its Active Set.
In step 606, receive Active Set Update message after, UE will reshuffle interface-free resources according to the information that this message provides.If the current soft handover that switches to adds its Active Set with new Radio Link when then UE keeps the Radio Link of original SERS.If the current direct-cut operation that switches to, then UE deletes the Radio Link of original SERS from its Active Set, and new Radio Link is added Active Set.After UE successfully inserts Target cell, will send activating set updating and finish (Active Set UpdateComplete) message, notice SERS handover success.
Under the situation of soft handover, receive data behind the UE access Target cell simultaneously from SERS and TERS.
At this, soft handover is described further with direct-cut operation with contrasting.The Ec/I of the Common Pilot Channel of UE measure neighbor cells (CPICH)
0, according to measuring foundation and safeguarding a dedicated channel (DCH) Active Set, keep soft handover with the sub-district in the DCH Active Set and be connected, keep transfer of data.Sub-district in the Active Set can belong to same base station also can belong to different base stations.Can only carry out the direct-cut operation of different base station minizone compares with the gsm system that belongs to second generation mobile communication system, soft handover has improved the data smoothing transmission of user in the different base station minizone, make that professional service quality is relatively good, be not easy to cause loss of data.
After whole switching flow finished, TERS also may be according to the beta pruning flow process of routine, switched to the elite tree of shortest path by shared tree, to optimize the transmission path between itself and IAGW.
Below, an embodiment of the multicast switching device that the present invention proposes is described with reference to Fig. 7.
For the UE that moves to TERS from SERS, the multicast switching device on the TERS comprises: the message detection device is used to detect the message the base station at its place received and detected handoff request message is sent to information extracting device; Information extracting device is used for extracting the IP address of the multicast router that SERS registered and sending to the multicast registration device from the handoff request message of receiving; The multicast registration device, register requirement is sent to the multicast router of correspondence in the IP address that is used for the multicast router registered according to SERS.
For technical scheme of the present invention is more readily understood, in this specification, be that example is described with the two-layer node evolution architecture.In fact, multicast switching method and equipment that the present invention proposes can be applied under any network architecture, comprise two-layer, the three node layer network architectures and other any type of network architectures.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1. multicast switching method, when a user equipment (UE) from source base station when target BS moves, this method may further comprise the steps:
A, determine that according to the measurement data that obtains UE needs when target BS switches when source base station, source base station triggers the switching set-up procedure to target BS transmission handoff request message;
B, in switching set-up procedure, target BS is set up the user plane bearer between the gateway with source base station, the multicast router under source base station is registered simultaneously;
C, when target BS receives that its multicast router of registering mails to the copy of data of source base station, for described user equipment (UE) distributes resource requirement and sends switching command to source base station being allocated successfully the back;
D, source base station are received after the switching command, stop switching set-up procedure and triggering hand-off execution process.
2. the method for claim 1 is characterized in that described step B further comprises: according to the handoff request message of receiving from source base station, between target BS and described gateway, set up with source base station and gateway between identical user plane bearer.
3. method as claimed in claim 2, it is characterized in that described handoff request message to contain the IP address of source base station gateway and source base station be that current business is distributed and gateway between the GTP tunnel sign of GTP passage.
4. method as claimed in claim 3 is characterized in that described handoff request message also comprises User Datagram Protoco (UDP) udp port sign.
5. the method for claim 1 is characterized in that described step B further comprises: the multicast router registration of handoff request message under source base station that the target BS basis is received from source base station.
6. method as claimed in claim 5 is characterized in that described handoff request message contains the IP address of the multicast router that source base station registers.
7. the method for claim 1 is characterized in that described step C further comprises: multicast router duplicates portion with the data that mail to source base station and mails to target BS after receiving the register requirement that target BS sends.
8. the method for claim 1, the hand-off execution process that it is characterized in that described step D further comprises: source base station sends activating set updating message to described user equipment (UE), and user equipment (UE) receives that the Radio Link of after the described message target BS being built adds its Active Set.
9. method as claimed in claim 8, the hand-off execution process that it is characterized in that described step D further comprises: when described when switching to soft handover, when the Radio Link that user equipment (UE) is built target BS adds its Active Set, the Radio Link of source base station is retained in the Active Set.
10. method as claimed in claim 8, the hand-off execution process that it is characterized in that described step D further comprises: when described when switching to direct-cut operation, when the Radio Link that user equipment (UE) is built target BS adds its Active Set, the Radio Link of source base station is deleted from Active Set.
11. the method for claim 1 is characterized in that also comprising after step: E, the finishing switching, target BS is switched to the elite tree of shortest path by shared tree according to the beta pruning flow process.
12. the method for claim 1 is characterized in that described base station and gateway are respectively wireless base station, edge ERS and the IP IAD IAGW under the two-layer node network architecture.
13. a multicast switching device, for from source base station to the user equipment (UE) that target BS moves, it is characterized in that this equipment is positioned on the target BS, comprising:
The message detection device is used to detect message of the base station at its place receiving and the handoff request message that detected source base station is sent and sends to information extracting device;
Information extracting device is used for the IP address of the multicast router registered from the handoff request message extraction source base station of receiving and sends to the multicast registration device;
The multicast registration device, register requirement is sent to the multicast router of correspondence in the IP address that is used for the multicast router registered according to source base station.
14. equipment as claimed in claim 13 is characterized in that described base station is wireless base station, the edge ERS under the two-layer node network architecture.
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| CNB2005101159232A CN100461951C (en) | 2005-11-11 | 2005-11-11 | A method and device for multicast switching |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101267593B (en) * | 2007-03-15 | 2011-04-20 | 华为技术有限公司 | Method and base station for activating multicast and broadcast multimedia service in target cells |
| CN101325500B (en) * | 2007-06-13 | 2012-12-12 | 华为技术有限公司 | Method, system and apparatus for implementing multicast load-bearing resource |
| CN101494885B (en) * | 2008-01-21 | 2011-11-30 | 中兴通讯股份有限公司 | Multi-load-bearing shared AMBR switching control method |
| CN101616404B (en) * | 2008-06-23 | 2011-12-21 | 华为技术有限公司 | method, device and system for selecting gateway |
| JP2011078024A (en) * | 2009-10-01 | 2011-04-14 | Ntt Docomo Inc | Mobile communication method, mobile station, and radio base station |
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|---|---|---|---|---|
| US6804221B1 (en) * | 2000-06-26 | 2004-10-12 | Alcatel | Micromobility using multicast |
| CN1605168A (en) * | 2001-12-12 | 2005-04-06 | 三星电子株式会社 | Method for performing a handoff in a mobile communication system |
| WO2005053187A1 (en) * | 2003-11-26 | 2005-06-09 | Electronics And Telecommunications Research Institute | Access router based mobile ipv6 fast handover method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6804221B1 (en) * | 2000-06-26 | 2004-10-12 | Alcatel | Micromobility using multicast |
| CN1605168A (en) * | 2001-12-12 | 2005-04-06 | 三星电子株式会社 | Method for performing a handoff in a mobile communication system |
| WO2005053187A1 (en) * | 2003-11-26 | 2005-06-09 | Electronics And Telecommunications Research Institute | Access router based mobile ipv6 fast handover method |
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