CN102045801B - Iur-g interface-based switching method - Google Patents
Iur-g interface-based switching method Download PDFInfo
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- CN102045801B CN102045801B CN 200910236572 CN200910236572A CN102045801B CN 102045801 B CN102045801 B CN 102045801B CN 200910236572 CN200910236572 CN 200910236572 CN 200910236572 A CN200910236572 A CN 200910236572A CN 102045801 B CN102045801 B CN 102045801B
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Abstract
The invention discloses an Iur-g interface-based switching method, which comprises that: user equipment (UE) is switched to a target base station controller (BSC) from a service radio network controller (RNC); in the switching process, after the service RNC sends a null interface switching command to the UE, the service RNC copies the downlink data to be sent and sends the downlink data through a wireless link of a source cell in which the UE is positioned and an Iur-g link; and when the service RNC receives a relocation detection message sent by the target BSC, the service RNC switches off the sending and receiving processing with the UE on the wireless link of the source cell, and the user plane of the UE is switched into the Iur-g interface. Through the method, the voice interruption time of a user can be shortened.
Description
Technical field
The present invention relates to the handoff technique in the communication system, particularly a kind of changing method based on the Iur-g interface.
Background technology
Under the environment of 2G and 3G coexistence, need to consider the switching between the two.At present, the switching between 2G and 3G all is to switch to 2G by 3G.Wherein, before the switching, exist between UE and Serving RNC (SRNC) to be connected, and through the SRNC core network access, in other words, UE and core net communicate by SRNC; Switch finish after, exist between UE and target BS C to be connected, and pass through target BS C core network access, in other words, UE and core net communicate by target BS C.
In handoff procedure, carry out the processing of UE side and the hand-off process of network side, particularly, the phase I of switching, with UE with switch to being connected of UE and target BS C being connected of SRNC, the second stage of switching switches to BSC with the intermediate entities between this UE and core net by SRNC.
After finishing, arrives the phase I transition period that has a transfer of data before second stage finishes, within this period, UE with switch to being connected of UE and target BS C being connected of SRNC, but intermediate entities is not yet finished to the switching of BSC by SRNC, at this moment, by the interface between SRNC and the target BS C (Iur-g interface), realize communicating by letter between UE and core net, in other words, upstream data sends to target BS C by UE, send to core net by target BS C through SRNC again, downlink data sends to SRNC by core net, sends to UE by SRNC through target BS C again.That is to say that 3G is based on the Iur-g interface to the handoff procedure of 2G at present.Concrete switching flow as shown in Figure 1.
Step 1, UE sends measurement report (MEASUREMENTREPORT) to Serving RNC (SRNC), triggers switching flow.
Step 2, SRNC sends reorientation resource request (ENHANCEDRELOCATION RESOURCE REQUEST) to the target BS C that switches.
Step 3, target BS C is to SRNC feedback reorientation resource response (ENHANCEDRELOCATION RESOURCE RESPONSE).
Step 5, after UE receives HANDOVER FROM UTRAN COMMAND, the link between cut-out and the SRNC, and to target BS C transmission switching access message (HANDOVERACCESS).
Step 6, target BS C sends reorientation probe message (ENHANCEDRELOCATION DETECT) to SRNC.
Step 7 after the UE access target BS C success, sends handoff completion message (HANDOVER COMPLETE) to target BS C.
Step 8, target BS C sends reorientation to SRNC and finishes message (ENHANCEDRELOCATION COMPLETE), after SRNC receives this message, changes user's face of UE over to the Iur-g interface.
After the user's face with UE changes the Iur-g interface over to, namely enter the transition period of previously described transfer of data, communicating by letter between UE and core net needs finish through the forwarding of SRNC and target BS C.
Next carry out the switching of the intermediate entities between UE and core net, until whole switching flow finishes.
In the above-mentioned switching flow, at network side, SRNC receives message " ENHANCED RELOCATION COMPLETE " that target BS C sends in step 8 before, remains on the old link of TD side always and receives and dispatches processing.SRNC only after receiving the handoff completion message that target BS C sends, thinks that just UE cuts the GSM residential quarter fully, changes user's face over to the Iur-g interface and receives and dispatches.
And in the UE side, such as aforementioned flow process, after UE receives the switching command of eating dishes without rice or wine " HANDOVER FROMURTAN COMMAND ", will cut off and SRNC between old link, and attempt access to target BS C.Wherein, in a single day UE finishes access, sets up the new link between UE and target BS C, and after target BS C transmission message " HANDOVER COMLETE ", just can carry out the transmitting-receiving of packet by the new link between UE and BSC.
Therefore in the whole handoff procedure, from the UE side, receive that at UE " HANDOVER FROMURTAN COMMAND " disconnects old link afterwards, just set up new link until send " HANDOVER COMLETE ", during this old link disconnection, new link are not yet set up again, because there are not communication link in UE and network side, so voice interruption is inevitable.
And from network side, SRNC in the message " ENHANCEDRELOCATION COMPLETE " of receiving target BS C transmission before, user's face of UE remains on the old link between UE and RNC always, until after receiving " ENHANCED RELOCATION COMPLETE " message, just change user's face over to the IUR-G interface.Before user's face does not change the Iur-g interface over to, behind the old link between UE disconnection and SRNC, even set up new link between UE and target BS C, but because user's face does not change the Iur-g interface over to, still can't communicate between UE and the target BS C.Based on this, the whole voice interruption time of UE will be on the basis of the aforementioned voice interruption time that is obtained by the analysis of UE side, adds the processing delay of propagation delay time, BSC and the RNC of message 7 and message 8 among Fig. 1 and user's face conversion time delay of RNC etc.As seen, because the processing of network side, even so that set up link connection between UE and target BS C, but still can't finish transfer of data, strengthen the time of voice interruption.
Summary of the invention
In view of this, the invention provides a kind of changing method based on the Iur-g interface, can reduce the time of voice interruption.
For achieving the above object, the present invention adopts following technical scheme:
A kind of changing method based on the Iur-g interface switches to target BS C with UE by Serving RNC, in described handoff procedure,
After described Serving RNC sent the switching command of eating dishes without rice or wine to described UE, described Serving RNC copied the downlink data that sends, and sent by Radio Link and the Iur-g link of cell-of-origin, UE place;
After described Serving RNC is received the reorientation probe message that described target BS C sends, described Serving RNC cut off with described UE between transmitting-receiving processing on the Radio Link of cell-of-origin, change user's face of described UE over to the Iur-g interface.
Preferably, the method further comprises: after described Serving RNC sent the switching command of eating dishes without rice or wine to described UE, described Serving RNC was further monitored upstream data on the Radio Link of cell-of-origin and the upstream data on the Iur-g link;
Before described Serving RNC receives that the reorientation of described target BS C is surveyed, if described Serving RNC monitors the legal upstream data that described UE sends at the Iur-g link, then described Serving RNC is directly carried out the described operation of receiving and dispatching processing and conversion UE user face on the Radio Link of cell-of-origin that is breaking at.
Preferably, when described UE access target BS C failure, send the switch failure information of eating dishes without rice or wine to described Serving RNC, after described Serving RNC received this message, the downlink data that stops on the Iur-g link sent and the upstream data monitoring.
As seen from the above technical solution, among the present invention, when UE was switched to target BS C by SRNC, after SRNC sent the switching command of eating dishes without rice or wine to UE, SRNC copied the downlink data that sends, and sent by Radio Link and the Iur-g link of cell-of-origin, UE place; After SRNC received the reorientation probe message that target BS C sends, the transmitting-receiving that SRNC cuts off on the Radio Link of cell-of-origin was processed, and changed user's face of UE over to the Iur-g interface.Pass through aforesaid operations, the opportunity of converting users face in the prior art, SRNC has carried out the conversion of user's face in advance, and two the sending out by the old and new's link up-downgoing data processed, after the conversion of user's face, UE can pass through new link downlink data receiving immediately, thereby has reduced the time that user speech interrupts.
Further, SRNC is after sending the switching command of eating dishes without rice or wine to UE, further monitor the upstream data on old link and the Iur-g link, if before the reorientation probe message that receiving target BSC sends, monitor legal upstream data from the Iur-g link, then directly carry out the cut-out of old link and the conversion of user's face.Thereby further considered that SRNC receives the time-delay of reorientation probe message, avoided further having reduced the voice interruption time because the propagation delay time of reorientation probe message causes missing UE by the upstream data that new link sends.
Description of drawings
The switching flow schematic diagram of Fig. 1 for carrying out based on the Iru-g interface.
Fig. 2 is the two schematic diagrames of processing of sending out of SRNC among the present invention.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, below in conjunction with accompanying drawing the present invention is described in further details.
As described in the background art, SRNC sends the switching command of eating dishes without rice or wine to UE in step 4, after UE receives this switching command of eating dishes without rice or wine, will cut off Radio Link old between self and SRNC, and carry out access attempts in new GSM residential quarter, in case access successfully, will send " HANDOVERCOMPLETE " message, this moment, UE can receive and dispatch processing at new link.Therefore the conversion opportunity of choose reasonable RNC side on the old and new's link changes user's face over to the IUR-G interface from the TD side fully, will directly affect the break period of UE on user's face.
Based on this, basic thought of the present invention is: adjust SRNC and change UE user's face opportunity of Iur-g interface over to, carry out in advance the conversion of UE user's face, thereby utilize as early as possible the Iur-g link to carry out data communication between core net and UE.
Further analyze as can be known, after UE cuts off old link, namely can't utilize old link to carry out communicating by letter between UE and core net.Before old link is disconnected to new link establishment during this period of time in, do not exist between UE and network to be connected, therefore during this period of time voice interruption can't be eliminated by the processing of network side merely.To improve for other voice interruption times except this voice interruption time (hereinafter referred to as time period 1) among the present invention.
Particularly, the zero-time of time period 1 is that UE receives the switching command of eating dishes without rice or wine, and the concluding time is that UE sends handoff completion message.Before the zero-time of time period 1, UE utilizes old link and core net to communicate, and after the concluding time of time period 1, the new link establishment of UE and target BS C considers to utilize communicating by letter of Iur-g Interface realization UE and core net.
In the specific implementation process, the zero-time of time period 1 and concluding time all are the time that message was received or sent to the UE side joint, and network side can't accurately be known.Based on this, be thought of as this time period among the present invention to reserve certain affluence amount, guarantee the transmitting of packet.
Zero-time for the time period 1: SRNC can determine that self sends the time of the switching command of eating dishes without rice or wine, and should the time also one fix on UE and receive before the switching command of eating dishes without rice or wine, therefore, among the present invention, after SRNC sends the switching command of eating dishes without rice or wine, carry out immediately the preparation that the user is about to cut off old link, the downlink data of core net being issued UE sends by the Iur-g link; Simultaneously, receive this order because SRNC sends the switching command of eating dishes without rice or wine to UE, have certain propagation delay time, in this process, old link is still effective, and therefore, the downlink data that SRNC also further issues core net UE also sends by old link.Wherein, the old link Radio Link of cell-of-origin, UE place namely.
For the concluding time of time period 1: by flow process shown in Figure 1 as seen, target BS C sends the time of reorientation probe message, be early than the concluding time of time period 1, in the situation of normal process, SRNC receives the time of reorientation probe message, also should be early than the concluding time of time period 1; Simultaneously, when SRNC received the reorientation probe message, UE had necessarily cut off old link, necessarily can't communicate by old link.Based on this, among the present invention, the time advance of conversion UE user face is received time of reorientation probe message to SRNC, SRNC is after this reorientation probe message of reception, the user's face that is about to UE changes the Iru-g interface over to, and the transmitting-receiving on the old link is processed between cut-out and UE.
Based on above-mentioned analysis and concrete processing mode, among the present invention the switching flow based on the Iur-g interface is improved, specifically comprise: when carrying out hand-off process shown in Figure 1,
After SRNC sent the switching command of eating dishes without rice or wine to UE in step 4, SRNC begins that immediately downlink data is carried out two sending out to be processed.The downlink data that sends is copied, and send by Radio Link and the Iur-g link of cell-of-origin, UE place;
After SRNC receives the reorientation probe message that target BS C sends, SRNC cut off immediately and UE between transmitting-receiving on the Radio Link of cell-of-origin process, and change user's face of UE over to the Iur-g interface;
In step 8, after SRNC receives that message is finished in reorientation, just do not need to cut off again the operation of old link and the conversion of user's face.
Wherein, the schematic diagram of two processing on the one hand, carries out Packet Generation by the old link shown in the left-half among the figure as shown in Figure 2, on the other hand, carries out Packet Generation by the Iur-g link shown in the right half part among the figure.
Through after the above-mentioned processing, carry out two sending out at down direction and process, and determine (being after SRNC receives the reorientation probe message) after UE has cut off old link at SRNC, also cut off immediately old link, change user's face over to the Iur-g interface.Like this, as long as user's face leads on the Radio Link of UE cell-of-origin or the arbitrary link between UE and target BS C, UE just can receive downlink data.In more detail, before UE cut off old link, its user's face also remained on the old link, and the downlink data that issues by old link can arrive UE; After UE cuts off old link, downlink data also can issue by the Iur-g link, until after SRNC changes user's face over to the Iur-g interface, can be immediately with the transfer of data that issues by the Iur-g link to UE, thereby reduce the voice interruption time at down direction, greatly improve user's susceptibility.
Further, the present invention can also further reduce the time of voice interruption under special circumstances by the further processing on up link.Specific as follows:
As previously mentioned, target BS C sends the time of reorientation probe message, be early than the concluding time of time period 1, in the situation of normal process, SRNC receives the time of reorientation probe message, also should be early than the concluding time of time period 1, and namely UE sends the time of handoff completion message.But, because user's face and signaling plane are separate on the IUR-G interface, consider the delay of signalling and the processing delay of SRNC, have following possibility: SRNC receives and processes before " ENHANCEDRELOCATION DETECT " message, UE has sent handoff completion message, and sent the active data bag at up direction, in this case, if carry out the conversion of user's face receive " ENHANCEDRELOCATION DETECT " message at SRNC after, just may be lost in SRNC and receive the upstream data bag that sends before " ENHANCED RELOCATION DETECT " message.
Based on above-mentioned analysis, among the present invention, further after SRNC sends the switching command of eating dishes without rice or wine, begin immediately to carry out up two the receipts and process.Particularly, on the Radio Link of UE cell-of-origin and Iur-g link, carry out simultaneously the monitoring of upstream data bag, before SRNC receives the reorientation detection and carries out the conversion of user's face, in case monitor legal upstream data bag is arranged on the Iur-g interface, just show UE by and target BS C between new link sent upstream data, at this moment, although SRNC does not receive the reorientation detection, SRNC also changes user's face of UE over to the Iur-g interface, and the transmitting-receiving of cutting off on the old Radio Link is processed, with reduce disturbance.
After processing through this, the problem of missing the UE upstream data that just can avoid the propagation delay time owing to the reorientation probe message to cause.Can when the signalling time delay is larger, further reduce user's voice interruption, greatly improve user's susceptibility.
In addition, consider the problem of UE possibility handoff failure, the present invention also further comprises the abnormality processing mode:
At present, after the new GSM residential quarter failure of UE access, UE can send switch failure information " HANDOVER FROM UNTRAN FAIL " to SRNC; Among the present invention, after SRNC receives " HANDOVER FROM UNTRAN FAIL " message of UE transmission, (specifically comprising the monitoring of upstream data on the Iur-g link and the transmission of downlink data) processed in the transmitting-receiving that is breaking on the Iur-g link, and user's face of UE is remained on the Radio Link of cell-of-origin always.
By the specific implementation of the invention described above as seen, among the present invention, on the one hand, receive and dispatch processing in dual link, on the one hand after definite UE has cut off old link, carry out in advance the conversion of user's face, thereby reduce the time based on voice interruption in the novel handoff procedure of IUR-G, improve to the full extent user's voice impression.
Being preferred embodiment of the present invention only below, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. the changing method based on the Iur-g interface switches to target BS C with UE by Serving RNC, it is characterized in that, and in described handoff procedure,
After described Serving RNC sent the switching command of eating dishes without rice or wine to described UE, described Serving RNC copied the downlink data that sends, and sent by Radio Link and the Iur-g link of cell-of-origin, UE place;
After described Serving RNC is received the reorientation probe message that described target BS C sends, described Serving RNC cut off with described UE between transmitting-receiving processing on the Radio Link of cell-of-origin, change user's face of described UE over to the Iur-g interface;
After described Serving RNC sent the switching command of eating dishes without rice or wine to described UE, described Serving RNC was further monitored upstream data on the Radio Link of cell-of-origin and the upstream data on the Iur-g link;
Before described Serving RNC is received the reorientation probe message of described target BS C, if described Serving RNC monitors the legal upstream data that described UE sends at the Iur-g link, then described Serving RNC is directly carried out and is breaking at the operation of receiving and dispatching processing and conversion UE user face on the Radio Link of cell-of-origin.
2. method according to claim 1, it is characterized in that, when described UE access target BS C failure, send the switch failure information of eating dishes without rice or wine to described Serving RNC, after described Serving RNC received the described switch failure information of eating dishes without rice or wine, the downlink data that stops on the Iur-g link sent and the upstream data monitoring.
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| CN104796945B (en) * | 2014-01-16 | 2019-07-02 | 中国移动通信集团广东有限公司 | A kind of dual link data transmission method, device, system and a kind of terminal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1893720A (en) * | 2005-07-08 | 2007-01-10 | 华为技术有限公司 | Method of switching-over between systems |
| CN1984452A (en) * | 2006-06-13 | 2007-06-20 | 华为技术有限公司 | Method for acquiring system information as switching residence |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1893720A (en) * | 2005-07-08 | 2007-01-10 | 华为技术有限公司 | Method of switching-over between systems |
| CN1984452A (en) * | 2006-06-13 | 2007-06-20 | 华为技术有限公司 | Method for acquiring system information as switching residence |
Non-Patent Citations (2)
| Title |
|---|
| "Iur-g interface";3rd Generation Partnership Project;《3GPP TS 43.130 V8.0.0(Release 8)》;20081231;全文 * |
| 3rd Generation Partnership Project."Iur-g interface".《3GPP TS 43.130 V8.0.0(Release 8)》.2008, |
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