CN1992717B - Wireless access network framework and method for realizing real-time service nondestructive migration thereof - Google Patents
Wireless access network framework and method for realizing real-time service nondestructive migration thereof Download PDFInfo
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Abstract
The invention relates to a wireless access network and a method for realizing service non-damage transfer, wherein said network comprises physical node ERS (edge wireless base station), IAGW (IP access network gate), and relative distributed E_RLC (expanded wireless chain control layer) protocol. And the method comprises that: when UE working at AM (answer mode) is not switched, RRLC sends CRLC descending data via E_MAC layer to UE, UE sends ACK/NACK (answer/mistake answer) message to RRLC, via said message, ERS and IAGW will process; when UE has switched regions, and the target ERS has build wireless chain with UE, UE sends all unsent ACK/NACK message to target ERS, via target ERS/IAGW to send the data in IAGW retransmit buffer to said UE. The invention can confirm the real-time property in UE switch, and realize non-damage transfer of service data between source base station and target base station.
Description
Technical field
The present invention relates to network communication field, relate in particular to the implementation method of a kind of Radio Access Network framework and service nondestructive thereof migration.
Background technology
UMTS (Universal Mobile Telecommunications System, universal mobile telecommunications system) is a kind of employing WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA)) 3-G (Generation Three mobile communication system) of air interface technologies also calls the WCDMA communication system to the UMTS system usually.The UMTS system has adopted and the similar system configuration of second generation mobile communication system, and its system configuration as shown in Figure 1.This system configuration mainly comprises RAN (Radio AccessNetwork, Radio Access Network) and CN (Core Network, core network).Wherein RAN 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, CS) and PS (Packet Switched, packet-switched domain).UTRAN (UMTS Territorial Radio Access Network, UMTS Terrestrial radio access network), CN have constituted whole UMTS system with subscriber equipment.
The network configuration of UTRAN comprises one or several RNS (RNS) as shown in Figure 2.A RNS is made up of a RNC (Radio Network Controller, radio network controller) and one or more NodeB (base station).Interface between RNC and the CN is the lu interface, and NodeB is connected by the lub interface with RNC.In UTRAN inside, interconnected by lur between the RNC, lur can connect or connect by transmission network by the direct physical between the RNC.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 lub interface and the Uu interface, also participates in a part of RRM simultaneously.
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 lub 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 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, mobile management function such as switching and RNC Relocation (migration) or reorientation;
3, RRM and controlled function such as grand diversity merging, power control, radio bearer distribution.
3GPP (Third Generation Partnership Projects, third generation partnership project) considers the competitiveness of future network, considering that at present network is in this how evolution in future, have 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.
Existing a kind of network evolution scheme is the two-layer node framework, and the schematic diagram of this framework as shown in Figure 3.Under this framework, ERS (Edge Radio Station, wireless station, border) be the NodeB after the evolution, the function of most RNC before having, and take new physical-layer techniques, as OFDM (orthogonal frequency division multiplexing, OFDM), IAGW (IPAccess GateWay, the IP IAD) has part SGSN (Serving GPRSSupporting Node, service universal grouping wireless business supporting node) function of function and former GGSN (Gateway GPRS Supporting Node, ggsn).
In order to guarantee the smooth evolution of existing UTRAN framework, the two-layer node framework has been reused existing protocol to greatest extent.At the wireless interface oral-lateral, ERS is owing to merged the function of most RNC in the past, except keeping original physical layer function (L1), added MAC (Mdium Access Control again, medium access control layer) layer, RLC (Radio Link Control, Radio Link control) layer, PDCP (Packet Data Convergence Protocol, packet data convergence protocol) layer, RRC (Radio Resources Control, radio resource control) layer wait the function of protocol layer.Between ERS and IAGW, adopt GTP-U (GPRS Tunneling Protocol for User Plane, GPRS Tunnel Protocol user plane) tunnel transmission agreement.Two-layer node framework after the evolution because moving down of Radio interface protocols stack or user face protocol stack reduced transmission node, makes call setup time-delay and transmission delay shorten, and has improved data transmission performance.
Under above-mentioned two-layer node framework, because being displaced downwardly to ERS, handles in the air protocol stack, and when the switching flow between generation ERS, source ERS must be forwarded to the UE context of preserving in it among target ERS through IAGW, and whole migration flow process is as shown in Figure 4.In flow process shown in Figure 4, SERS is source ERS, and TERS is target ERS.Comprise the steps:
1, SERS needs to switch to TERS according to collected measurement data judgement UE.Because in evolution architecture, no lur interface can't exchange data between SERS and TERS.So SERS adjudicates in direct-cut operation, the lu interface need carry out reorientation, sends RELOCATION REQUIRED (needing reorientation) message to IAGW, triggers the Relocation process.
2, after IAGW receives above-mentioned RELOCATION REQUIRED message, send RELOCATION REQUEST (re-positioning request) message to TERS, request TERS is the required resource of UE preassignment.
3, after TERS receives RELOCATION REQUEST message, start relevant resource allocator, set up RRC connection, RAB (Radio Access Bearer RAB) carrying.Concrete processing procedure is: set up the PDCP/RLC/MAC entity, set up new Radio Link, and start transmission and reception on the new Radio Link; Start simultaneously and set up GTP-U Tunnels for PS RABs (setting up the GTP_U tunnel of PS territory RAB) transmission bearer, set up the user plane bearer between TERS and the IAGW.After all essential resources are successfully set up, distributed, target ERS will send RELOCATION REQUEST ACKNOWEDGE (re-positioning request affirmation) message to IAGW, confirm the resource allocation success.
4, after IAGW received RELOCATION REQUEST ACKNOWEDGE message, the resource allocation of judgement goal systems was ready, and decision continues the reorientation flow process.IAGW will send RELOCATION COMMAND (reorientation order) message to source ERS, the execution of notification source ERS trigger re-positioning this moment.
5, after source ERS receives RELOCATION COMMAND message, stop the reorientation set-up procedure, and read the switching-related parameters of RELOCATION COMMAND message, prepare PHYSICAL CHANNEL RECONFIGURATION (physical channel reconfigures) message of direct-cut operation, by the Uu interface this PHYSICAL CHANNEL RECONFIGURATION message is sent to UE, triggers UE and insert Target cell.
6, after UE receives PHYSICAL CHANNEL RECONFIGURATION message, will insert Target cell according to the information that PHYSICAL CHANNEL RECONFIGURATION message provides.After successfully inserting Target cell, UE will send PHYSICAL CHANNELRECONFIGURATION COMPLETE (physical channel reconfigures and finishes) message and give TERS, and notice TERS handover success triggers the execution of TERS reorientation.
7, after TERS receives PHYSICAL CHANNEL RECONFIGURATIONCOMPLETE message, begin to carry out the SERS function; And send RELOCATION DETECT (reorientation detection) message to IAGW, point out to detect SRNS (Serving Radio NetWorkSubsystem, SRNS Serving Radio Network Subsystem) and carry out reorientation.After IAGW receives this message, user's face is switched to TERS by SERS.
8, TERS sends RELOCATION COMPLETE (reorientation is finished) message to IAGW, and notice IAGW target ERS has finished the RELOCATION process.IAGW receives RELOCATION COMPLETE message, carries out lu release order, and the lu interface that is discharged into SERS connects.Under real-time condition, source ERS will abandon the Frame of its preservation.
The shortcoming of above-mentioned migration flow process is: whole migration flow process more complicated.In order to guarantee the time-delay of handoff procedure, in the process that realizes migration, the data among the ERS of source, such as, the UE contextual information of its preservation can't be transferred to target ERS from source ERS like that according to the lossless migration flow process, thereby cause lot of data to lose.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the implementation method that the purpose of this invention is to provide the migration of a kind of Radio Access Network framework and real-time service nondestructive thereof, thereby can when guaranteeing UE handoff procedure real-time, realize real time business data lossless migration between source base station and purpose base station of UE.
The objective of the invention is to be achieved through the following technical solutions:
A kind of Radio Access Network framework comprises, wireless base station, border ERS and IP IAD IAGW is characterized in that:
Air protocol stack among the ERS comprises the medium access control layer E-MAC of expansion and the wireless chain control layer E-RLC of distributed expansion;
IAGW has comprised the Radio interface protocols stack of distributed E-RLC and the Radio interface protocols stack of radio resource control rrc layer.
Described distributed E-RLC comprises:
Core net Radio Link control CRLC module: for adopting answer-mode AM data carried by data business, IAGW passes to the RRLC module by this module with this data service, and the CRLC module also provides retransmission buffer to preserve this data service;
Access Network Radio Link control RRLC module: ERS gives UE by this module with the described employing AM data carried by data service delivery that the CRLC module passes over, and the RRLC module also provides retransmission buffer to preserve this data service;
Reply ACK/ wrong responses NACK module: ERS and receive the ACK/NACK message that UE sends, acknowledge message or retransmit and correctly do not accept message in the retransmission buffer of deletion RRLC by this module.
Described distributed E-RLC comprises:
Reach the Flow Control module synchronously: cycle or condition trigger the flow process of the retransmission buffer that upgrades CRLC, and the while is carried out the Flow Control function of data service according to service quality QOS and Radio Link situation.
Described distributed E_RLC realizes by the RNS application protocol GTP_U agreement of revising radio protocol stack rlc protocol and lu interface.
The harmless method that does not repeatedly send Frame in a kind of Radio Access Network comprises step:
A, when the UE that is operated in AM does not switch, IAGW arrives ERS with data distributing, simultaneously preserve this data at the retransmission buffer of CRLC, the RRLC of ERS is issued to UE to the data that receive by the E_MAC layer, also preserves this data at the retransmission buffer of described RRLC simultaneously;
A2, after UE receives described data, if receive correctly, then send ACK message to ERS, after ERS receives this message, the corresponding data frame in the retransmission buffer of deletion RRLC; Otherwise, sending NACK message to ERS, after ERS received this message, the corresponding data frame that resends in the retransmission buffer of RRLC was given UE;
B, the sub-district takes place when switching as UE, after target ERS and UE had set up Radio Link, UE sent to target ERS to all ACK/NACK message of not sending out, by target ERS or IAGW the data of IAGW retransmission buffer was sent to described UE.
Described steps A also comprises:
When reaching certain setting moment or threshold value, reach the retransmission buffer of Flow Control module synchronously, the confirmed Frame of deletion RRLC according to the renewal of the retransmission buffer situation among RRLC CRLC.
Described step B specifically comprises:
B1, the sub-district takes place when switching as UE, after the retransmission buffer of source ERS fills up, RRLC abandons Frame or the indication CRLC that CRLC issues to be stopped to issue Frame to it, and after target ERS and UE set up Radio Link, UE sent to target ERS to all ACK/NACK message of not sending out;
B2, target ERS send to IAGW to the ACK/NACK message that receives, and the CRLC of IAGW is according to this ACK/NACK message, and the data of the retransmission buffer of CRLC are confirmed or retransmitted to described UE; Perhaps, target ERS receives the data of the retransmission buffer of CRLC, utilizes the ACK/NACK message that receives, the work that these data are confirmed or retransmitted.
Described step B1 specifically comprises:
B11, when UE carry out to switch, IAGW notification target ERS is that described UE sets up Radio Link and lu+ transmission bearer, IAGW also notifies described UE to carry out the air protocol stack by source ERS and reshuffles, switch to the sub-district that target ERS is covered;
B12, UE reshuffle after its air protocol stack finishes, and send handoff completion message to IAGW, and UE also uploads all ACK/NACK message that do not send to target ERS.
As seen from the above technical solution provided by the invention, the present invention is by redesigning the ERS of existing two-layer node network architecture and the function of IAGW, adopt distributed E_RLC to replace the contextual transfer of UE, simplified the migration flow process of the real time business data of UE.Can be under the prerequisite of not interrupting the data transmission, the reconstruction in that switching anchor point place has finished the downlink data buffer memory when guaranteeing the handoff procedure real-time, has guaranteed the business datum lossless migration in the handoff procedure.
Description of drawings
Fig. 1 is the structural representation of UMTS system;
Fig. 2 is the schematic network structure of UTRAN;
Fig. 3 is the schematic diagram of existing wireless access network network two-layer node framework;
Fig. 4 is for following the flow chart of transition process in the existing wireless access network network two-layer node framework;
Fig. 5 is the process chart of the specific implementation of the method for the invention;
Radio interface protocols stack E_RLC example by using on the ERS of source when Fig. 6 switches for not having is at the retransmission processes schematic diagram of the enterprising line data frame of source ERS;
When switching for UE, Fig. 7 carries out the retransmission processes schematic diagram of Frame by the Radio interface protocols stack E_RLC example that between IAGW and target ERS, uses.
Embodiment
The invention provides the implementation method of a kind of Radio Access Network framework and real-time service nondestructive thereof migration, core of the present invention is: adopt distributed E_RLC agreement to replace the contextual transfer of UE, simplified the migration flow process.
The Radio Access Network framework that the present invention proposes is a kind of new two-layer node network architecture.This framework designs again to the ERS of existing two-layer node network architecture and the function of IAGW.Specific as follows:
Air protocol stack among the ERS is evolved into E-MAC (MAC of expansion)/distributed E-RLC (RLC of expansion) by original MAC/RLC/PDCP, and wherein E-MAC has kept original MAC layer function.For the data service of adopting AM (answer-mode) mode carrying, distributed E-RLC has inherited ARQ (automatic repeat request) function of original execution buffering of rlc layer and retransmission mechanism, to guarantee the sequence delivery of data.And for the real time business that adopts UM (unacknowledged mode) and TM (telecommunication management) mode carrying, distributed E-RLC layer then need provide certain buffer memory ability, with in data transmission procedure, the flow-control mechanism between E-RLC protocol layer and E-MAC protocol layer is provided, guarantee carrying out smoothly of transfer of data.
IAGW has also comprised the radio protocol stack of distributed E-RLC layer, rrc layer except realizing original core net node function.
Described distributed E-RLC comprises:
Core net Radio Link control CRLC module: for adopting answer-mode AM data carried by data business, IAGW passes to the RRLC module by this module with this data service, and the CRLC module also provides retransmission buffer to preserve this data service;
Access Network Radio Link control RRLC module: ERS gives UE by this module with the described employing AM data carried by data service delivery that the CRLC module passes over, and the RRLC module also provides retransmission buffer to preserve this data service;
Reply ACK/ wrong responses NACK module: ERS and receive the ACK/NACK message that UE sends, acknowledge message or retransmit and correctly do not accept message in the retransmission buffer of deletion RRLC by this module;
Reach the Flow Control module synchronously: cycle or condition trigger the flow process of the retransmission buffer that upgrades CRLC, and the while is carried out the Flow Control function of data service according to service quality QOS and Radio Link situation.
Described distributed E_RLC can realize by GTP_U (RNS application protocol) agreement of revising radio protocol stack rlc protocol and lu interface.
Based on above-mentioned Radio Access Network framework, the invention provides a kind of harmless method that does not repeatedly send Frame, the handling process of the specific implementation of this method comprises the steps: as shown in Figure 5
Step 5-1, when the UE that is operated in AM does not switch, UE sends ACK/NACK message to RRLC, according to this ACK/NACK message, ERS and IAGW handle accordingly to the data in the retransmission buffer.
When UE does not switch, when UE was operated in AM, CRLC to RRLC, kept a copy at retransmission buffer with data distributing simultaneously, RRLC is issued to UE by E MAC layer after these data are done relevant treatment again, and the while keeps a copy at the retransmission buffer of oneself too.After UE receives data, correctly just send ACK message to ERS if receive; Just send NACK message to ERS if receive mistake.
After the RRLC of ERS receives the ACK/NACK message of UE, if ACK message is then deleted the corresponding data frame in the retransmission buffer of ERS; If NACK message then resends the corresponding data frame in the retransmission buffer of ERS.
When reaching sometime or during certain threshold value, reach the Flow Control module synchronously and upgrade the retransmission buffer of IAGW, the confirmed Frame of deletion RRLC according to the retransmission buffer situation among the ERS.
Above-mentioned retransmission processes schematic diagram at the enterprising line data frame of source ERS as shown in Figure 6.
Step 5-2, the sub-district takes place when switching as UE, after target ERS and UE set up Radio Link, UE sent to target ERS to all ACK/NACK message of not sending out, by target ERS or IAGW the data of IAGW retransmission buffer was sent to described UE.
When UE the sub-district takes place when switching, because the Radio Link of source ERS and UE interrupts, the RRLC on the ERS of source can not receive any ACK/NACK message, and the retransmission buffer of source ERS can be filled, and RRLC will abandon the Frame that CRLC issues or indicate CRLC to stop to issue.
When UE carries out switching, IAGW by and target ERS between the lu+ interface, notification target ERS is that described UE sets up Radio Link and lu+ transmission bearer, notifies described UE to carry out the air protocol stack by source ERS simultaneously and reshuffles, switch to the sub-district that target ERS is covered;
UE reshuffles after its air protocol stack finishes, and sends handoff completion message to IAGW, indicates its handoff procedure to finish, and subsequently, after target ERS and UE had set up Radio Link, UE uploaded all ACK/NACK message that do not send to target ERS.
After target ERS and IAGW had set up data transmission link, target ERS sent to CRLC among the IAGW to the ACK/NACK message that receives, and CRLC is according to this ACK/NACK message, and the data of IAGW retransmission buffer are confirmed or retransmitted to described UE; Perhaps, target ERS receives the data of IAGW retransmission buffer, utilizes the ACK/NACK message that receives, the work that these data are confirmed or retransmitted.
The above-mentioned retransmission processes schematic diagram that carries out Frame by the Radio interface protocols stack E_RLC example that uses between IAGW and target ERS as shown in Figure 7.
In a word, this improvement project is a kind of rlc protocol evolution scheme of effectively optimizing, switching flow in the two-layer node framework after the described improvement of the invention described above and real time business transition process are simpler than existing switching flow and real time business transition process, do not need extra signaling just can guarantee that harmless unduplicated Frame sends.And can deal with more exception.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (7)
1. a Radio Access Network framework comprises, wireless base station, border ERS and IP IAD IAGW is characterized in that:
Air protocol stack among the ERS comprises the medium access control layer E-MAC of expansion and the wireless chain control layer E-RLC of distributed expansion;
IAGW has comprised the Radio interface protocols stack of distributed E-RLC and the Radio interface protocols stack of radio resource control rrc layer.
Described distributed E-RLC comprises:
Core net Radio Link control CRLC module: for adopting answer-mode AM data carried by data business, IAGW passes to the RRLC module by this module with this data service, and the CRLC module also provides retransmission buffer to preserve this data service;
Access Network Radio Link control RRLC module: ERS gives UE by this module with the described employing AM data carried by data service delivery that the CRLC module passes over, and the RRLC module also provides retransmission buffer to preserve this data service;
Reply ACK/ wrong responses NACK module: ERS and receive the ACK/NACK message that UE sends, acknowledge message or retransmit and correctly do not accept message in the retransmission buffer of deletion RRLC by this module.
2. Radio Access Network framework according to claim 1 is characterized in that, described distributed E-RLC comprises:
Reach the Flow Control module synchronously: cycle or condition trigger the flow process of the retransmission buffer that upgrades CRLC, and the while is carried out the Flow Control function of data service according to service quality QOS and Radio Link situation.
3. Radio Access Network framework according to claim 1 is characterized in that, described distributed E_RLC realizes by the RNS application protocol GTP_U agreement of revising radio protocol stack rlc protocol and Iu interface.
4. can't harm the method that does not repeatedly send Frame in a Radio Access Network, it is characterized in that, comprise step:
A, when the UE that is operated in AM does not switch, IAGW arrives ERS with data distributing, simultaneously preserve this data at the retransmission buffer of CRLC, the RRLC of ERS is issued to UE to the data that receive by the E_MAC layer, also preserves this data at the retransmission buffer of described RRLC simultaneously;
A2, after UE receives described data, if receive correctly, then send ACK message to ERS, after ERS receives this message, the corresponding data frame in the retransmission buffer of deletion RRLC; Otherwise, sending NACK message to ERS, after ERS received this message, the corresponding data frame that resends in the retransmission buffer of RRLC was given UE;
B, the sub-district takes place when switching as UE, after target ERS and UE had set up Radio Link, UE sent to target ERS to all ACK/NACK message of not sending out, by target ERS or IAGW the data of IAGW retransmission buffer was sent to described UE.
5. method according to claim 4 is characterized in that, described steps A also comprises:
When reaching certain setting moment or threshold value, reach the retransmission buffer of Flow Control module synchronously, the confirmed Frame of deletion RRLC according to the renewal of the retransmission buffer situation among RRLC CRLC.
6. according to claim 4 or 5 described methods, it is characterized in that described step B specifically comprises:
B1, the sub-district takes place when switching as UE, after the retransmission buffer of source ERS fills up, RRLC abandons Frame or the indication CRLC that CRLC issues to be stopped to issue Frame to it, and after target ERS and UE set up Radio Link, UE sent to target ERS to all ACK/NACK message of not sending out;
B2, target ERS send to IAGW to the ACK/NACK message that receives, and the CRLC of IAGW is according to this ACK/NACK message, and the data of the retransmission buffer of CRLC are confirmed or retransmitted to described UE; Perhaps, target ERS receives the data of the retransmission buffer of CRLC, utilizes the ACK/NACK message that receives, the work that these data are confirmed or retransmitted.
7. method according to claim 6 is characterized in that, described step B1 specifically comprises:
B11, when UE carry out to switch, IAGW notification target ERS is that described UE sets up Radio Link and Iu+ transmission bearer, IAGW also notifies described UE to carry out the air protocol stack by source ERS and reshuffles, switch to the sub-district that target ERS is covered;
B12, UE reshuffle after its air protocol stack finishes, and send handoff completion message to IAGW, and UE also uploads all ACK/NACK message that do not send to target ERS.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030036387A1 (en) * | 2001-08-20 | 2003-02-20 | Andras Kovacs | Relocation method, system and network element |
| CN1399856A (en) * | 1999-11-23 | 2003-02-26 | 艾利森电话股份有限公司 | SRNS relocation in UMTS network |
| EP1592275A1 (en) * | 2004-04-29 | 2005-11-02 | Matsushita Electric Industrial Co., Ltd. | Relocation also of parts of radio resource management control functionality from one BTS to a second in a distributed radio access networks |
| CN1921481A (en) * | 2005-08-26 | 2007-02-28 | 华为技术有限公司 | User protocol depot and method for realizing nondestructive transfer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1399856A (en) * | 1999-11-23 | 2003-02-26 | 艾利森电话股份有限公司 | SRNS relocation in UMTS network |
| US20030036387A1 (en) * | 2001-08-20 | 2003-02-20 | Andras Kovacs | Relocation method, system and network element |
| EP1592275A1 (en) * | 2004-04-29 | 2005-11-02 | Matsushita Electric Industrial Co., Ltd. | Relocation also of parts of radio resource management control functionality from one BTS to a second in a distributed radio access networks |
| CN1921481A (en) * | 2005-08-26 | 2007-02-28 | 华为技术有限公司 | User protocol depot and method for realizing nondestructive transfer |
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