CN101296483A - Condition informing method of switch course of mobile communication system - Google Patents
Condition informing method of switch course of mobile communication system Download PDFInfo
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- CN101296483A CN101296483A CNA2007100972569A CN200710097256A CN101296483A CN 101296483 A CN101296483 A CN 101296483A CN A2007100972569 A CNA2007100972569 A CN A2007100972569A CN 200710097256 A CN200710097256 A CN 200710097256A CN 101296483 A CN101296483 A CN 101296483A
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Abstract
The invention provides a status notification method for the switching process of a mobile communication system. The method comprises the following steps: when a terminal needs to be switched to a target base station, a source base station transmits a wireless link layer status report to the terminal; and the synchronization between the wireless link status of the terminal and the wireless link status of the source base station can be realized according to the wireless link layer status report. Therefore, through the invention, the RLC layer status report is notified to the terminal in the switching process, and the synchronization between the layer status of the source base station and the layer status of the terminal RLC is realized, thus avoiding the re-transmission of a data packet which is correctly received already by the source base station after the terminal is switched.
Description
Technical field
The present invention relates to distributed cellular radio communication system, more specifically, relate to the state notice method in a kind of mobile communcations system handoff procedure.
Background technology
With reference to figure 1, the distributed cellular wireless telecommunication system mainly comprises terminal, base station and core net.The connection of logic or physics can be arranged between the base station as required, and the network that the base station is formed is called wireless access network (RAN), is responsible for the Access Layer affairs, and for example, the management of Radio Resource and the Radio Resource of up-downgoing are according to the scheduling of the mode of shared channel.Each base station can link to each other with one or more than one core net node (CN).Core net is responsible for the Non-Access Stratum affairs, for example, and mobile management etc.Terminal is meant the equipment that can carry out communication with network, for example mobile phone or notebook computer etc.Each terminal can only be connected to a base station in the network on up direction.
In order to guarantee that handoff procedure is a harmless process, guarantee that promptly Bao Buhui loses, switch at first, source base station need be in the packet convergence-level on the up direction (being called for short PDCP) not being preceding the forwarding on the target BS of Service Data Unit (being called for short SDU) of receiving according to the order of sequence, and terminal is after switching to target BS, can retransmit and also not obtain the PDCPSDU that confirms.Whether the SDU of certain PDCP obtains to confirm, depends on whether the radio link layer relevant with this SDU protocol data bag of (being called for short RLC) (being called for short PDU) sends success.With reference to figure 2, the flow process of user's face and chain of command comprises:
Step 205, at this moment terminal is required to switch to target BS, and the RRC protocol layer of source base station sends switching command to terminal;
Step 207, terminal begin to insert target BS;
Step 208, target BS send to terminal switches access confirmation message;
Step 209, terminal send handoff completion message to target BS; And
In above-mentioned flow process, if PDCP PDU N receives that according to the order of sequence target BS can directly send to core net to the PDCP SDU N of correspondence so.Because same reason, terminal has been retransmitted PDCP SDU N after switching, will receive identical packet in core net like this, equally the packet overlapping phenomenon can take place.So the essential reason of packet overlapping phenomenon takes place is because the rlc layer acknowledge message of source base station feedback is lost.
Thereby, be badly in need of a kind of scheme and solve the problems referred to above, thereby avoid terminal after switching, retransmit the packet that source base station has correctly been received.
Summary of the invention
In order to overcome above-mentioned difficulties, the invention provides the state notice method in a kind of mobile communcations system handoff procedure, wherein, switching at first, source base station sends a RLC status report to terminal, so that the state at the rlc layer agreement carries out synchronously between terminal and the source base station.
The invention provides the state notice method in a kind of mobile communcations system handoff procedure, it may further comprise the steps: step S302, and when terminal need be switched to target BS, source base station sent the wireless link layer state report to described terminal; And step S304, report realizes wireless link layer state synchronous between described terminal and the described source base station according to described wireless link layer state.
In said method, comprise the affirmation information of the radio link layer protocol data bag that success receives in the described wireless link layer state report.The radio link layer of described terminal upgrades the send state information of described radio link layer according to the described wireless link layer state report of receiving.The radio link layer of described terminal sends the affirmation information of relevant PDCP packet according to the described send state information after upgrading to the packet data convergence protocol of described terminal.It is that described source base station has been determined described terminal is switched to described target BS that described terminal need be switched to target BS, and described target BS also confirms to allow described terminal incision.
Described source base station sends the wireless link layer state report to described terminal and realizes by by described source base station described wireless link layer state report being carried in the switching command message.
Described source base station is to described terminal after to send the wireless link layer state report be to have sent described switching command by described source base station, and the radio link layer of described source base station sends directly that radio link layer that described wireless link layer state reports to described terminal realizes.
Thereby, by the present invention,, reaching source base station and terminal rlc layer state synchronization, thereby avoided terminal after switching with rlc layer status report notice terminal when switching, retransmit the packet that source base station has correctly been received.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structured flowchart of distributed cellular wireless telecommunication system of the prior art;
Fig. 2 is the signal flow graph of the packet that terminal re-sends has correctly been received behind of the prior art the switching;
Fig. 3 is the flow chart according to the state notice method in the mobile communcations system handoff procedure of the present invention;
Fig. 4 is the signal flow graph that sends to the process of terminal according to the RLC status report of first embodiment of the invention by switching command; And
Fig. 5 is the signal flow graph that sends to the process of terminal according to the RLC status report of second embodiment of the invention by rlc layer control signaling.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
The present invention is being switched at first, makes source base station send a RLC status report to terminal, so that the state at the rlc layer agreement carries out synchronously between terminal and the source base station.This RLC status report can directly be included in the switching command message.Source base station will require a RLC status report to rlc layer sending before the switching command, is embedded in then in the switching command of rrc layer and sends to terminal.The rrc layer agreement of terminal before terminal switches to target BS, is handed to rlc layer to this RLC status report after receiving switching command, thereby realizes the rlc layer state synchronization.Above process is with reference to the description of figure 3 about the state notice method in first kind of mobile communcations system handoff procedure.
Fig. 3 is the flow chart according to the state notice method in first kind of mobile communcations system handoff procedure of the present invention.As shown in Figure 3, this state notice method may further comprise the steps:
Step S302, when terminal need be switched to target BS, source base station sent the wireless link layer state report to described terminal; And
Step S304, report realizes wireless link layer state synchronous between described terminal and the described source base station according to described wireless link layer state.
In said method, comprise the affirmation information of the radio link layer protocol data bag that success receives in the described wireless link layer state report.The radio link layer of described terminal upgrades the send state information of described radio link layer according to the described wireless link layer state report of receiving.The radio link layer of described terminal sends the affirmation information of relevant PDCP packet according to the described send state information after upgrading to the packet data convergence protocol of described terminal.It is that described source base station has been determined described terminal is switched to described target BS that described terminal need be switched to target BS, and described target BS also confirms to allow described terminal incision.
Described source base station sends the wireless link layer state report to described terminal and realizes by by described source base station described wireless link layer state report being carried in the switching command message.
Described source base station is to described terminal after to send the wireless link layer state report be to have sent described switching command by described source base station, and the radio link layer of described source base station sends directly that radio link layer that described wireless link layer state reports to described terminal realizes.
First embodiment
Fig. 4 is the signal flow graph that sends to the process of terminal according to the RLC status report of first embodiment of the invention by switching command.As shown in Figure 4, when switching, source base station is attached to the RLC status report in the switching command message, sends to terminal, and the process of switching is as follows:
Step S402, the PDCP layer of terminal send PDCP PDU N to rlc layer;
Step S404, rlc layer converts PDCP PDU N to RLC PDU M, and issues the rlc layer of source base station;
Step S406, source base station successfully receive RLC PDU M, and RLC PDU M is converted to PDCP PDU N.Because this PDCP PDU does not receive according to the order of sequence, so temporarily be stored on the PDCP layer of source base station;
Step S408, the rlc layer of source base station has responded the affirmation message of RLCPDU M for then the rlc layer of terminal, but for a certain reason, incorrect this acknowledge message that receives of terminal, so the rlc layer of terminal thinks that RLC PDU M does not also send successfully, relevant therewith, the PDCP layer of terminal thinks that PDCP PDU N does not send successfully yet;
Step S410, at this moment terminal is required to switch to target BS, and the RRC protocol layer of source base station sends switching command to terminal, in switching command, in source base station is included in the state report information of rlc layer, comprising the affirmation information of RLC PDU M;
Step S410.1, the RRC protocol layer of terminal are after receiving switching command, and notice rlc protocol layer RLC PDU M correctly receives;
Step S410.2, the PDCP protocol layer PDCPPDU N of the rlc protocol layer terminal of terminal correctly receives;
Step S412, source base station are given to target BS before the PDCP SDU N that will be corresponding with PDCP PDU N after having sent switching command;
Step S414, terminal is received after the switching command, begins to insert target BS;
Step S416, target BS send to terminal and switch access confirmation message;
Step S418, terminal sends handoff completion message to target BS; And
Step S420, the PDCP layer of terminal recovers to send PDCP SDU to target BS by underlying protocol, because the known road of terminal PDCP SDU N has sent success, so thereby no longer retransmit PDCP SDU N and avoid the repeating transmission phenomenon of identical data packet for target BS.
Second embodiment
Fig. 5 is the signal flow graph that sends to the process of terminal according to the RLC status report of second embodiment of the invention by rlc layer control signaling.As shown in Figure 5, the process of switching is as follows:
Step S502, the PDCP layer of terminal send PDCP PDU N to rlc layer;
Step S504, rlc layer converts PDCP PDU N to RLC PDU M, and issues the rlc layer of source base station;
Step S506, source base station successfully receive RLC PDU M, and RLC PDU M is converted to PDCP PDU N.Because this PDCP PDU does not receive according to the order of sequence, so temporarily be stored on the PDCP layer of source base station;
Step S508, the rlc layer of source base station has responded the affirmation message of RLCPDU M for then the rlc layer of terminal, but for a certain reason, incorrect this acknowledge message that receives of terminal, so the rlc layer of terminal thinks that RLC PDU M does not also send successfully, relevant therewith, the PDCP layer of terminal thinks that PDCP PDU N does not send successfully yet;
Step S510, at this moment terminal is required to switch to target BS, and the RRC protocol layer of source base station sends switching command to terminal;
Step S510.1, source base station are after having sent switching command, and the rrc layer agreement requires rlc layer to send a status report to terminal by primitive STATUS REPORT REUQEST;
Step S510.2, rlc layer send a status report to terminal, have confirmed successfully to receive RLC PDU M;
Step S510.3, the rlc layer notice PDCP protocol layer PDCP PDU N of terminal has sent success;
Step S512, source base station are given to target BS before the PDCP SDU N that will be corresponding with PDCP PDU N after having sent switching command;
Step S514, terminal begins to insert target BS according to the switching command of receiving;
Step S516, target BS send to terminal and switch access confirmation message;
Step S518, terminal sends handoff completion message to target BS; And
Step S520, the PDCP layer of terminal recovers to send PDCP SDU to target BS by underlying protocol, N has sent success because terminal has been known PDCP SDU, so thereby no longer retransmit PDCP SDU N and avoid the repeating transmission phenomenon of identical data packet for target BS.
In sum, adopt method of the present invention, can be with rlc layer status report notice terminal when switching, reaching source base station and terminal rlc layer state synchronization, thereby avoided after switching, retransmitting the packet that source base station has correctly been received.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the state notice method in the mobile communcations system handoff procedure is characterized in that,
May further comprise the steps:
Step S302, when terminal need be switched to target BS, source base station sent the wireless link layer state report to described terminal; And
Step S304, report realizes wireless link layer state synchronous between described terminal and the described source base station according to described wireless link layer state.
2. state notice method according to claim 1 is characterized in that, comprises the affirmation information of the radio link layer protocol data bag that success receives in the described wireless link layer state report.
3. state notice method according to claim 2 is characterized in that, the radio link layer of described terminal upgrades the send state information of described radio link layer according to the described wireless link layer state report of receiving.
4. state notice method according to claim 2, it is characterized in that, the radio link layer of described terminal sends the affirmation information of relevant PDCP packet according to the described send state information after upgrading to the packet data convergence protocol of described terminal.
5. according to each described state notice method in the claim 1 to 4, it is characterized in that, it is that described source base station has been determined described terminal is switched to described target BS that described terminal need be switched to target BS, and described target BS also confirms to allow described terminal incision.
6. according to each described state notice method in the claim 1 to 4, it is characterized in that described source base station sends the wireless link layer state report to described terminal and realizes by by described source base station described wireless link layer state report being carried in the switching command message.
7. according to each described state notice method in the claim 1 to 4, it is characterized in that, described source base station is to described terminal after to send the wireless link layer state report be to have sent described switching command by described source base station, and the radio link layer of described source base station sends directly that radio link layer that described wireless link layer state reports to described terminal realizes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100972569A CN101296483A (en) | 2007-04-28 | 2007-04-28 | Condition informing method of switch course of mobile communication system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100972569A CN101296483A (en) | 2007-04-28 | 2007-04-28 | Condition informing method of switch course of mobile communication system |
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| CN101296483A true CN101296483A (en) | 2008-10-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105165061A (en) * | 2013-05-09 | 2015-12-16 | 株式会社Ntt都科摩 | Handover method and wireless base station |
| CN109155951A (en) * | 2016-05-27 | 2019-01-04 | 华为技术有限公司 | transmission method, base station and terminal |
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2007
- 2007-04-28 CN CNA2007100972569A patent/CN101296483A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105165061A (en) * | 2013-05-09 | 2015-12-16 | 株式会社Ntt都科摩 | Handover method and wireless base station |
| CN105165061B (en) * | 2013-05-09 | 2018-09-18 | 株式会社Ntt都科摩 | Switching method and wireless base station |
| CN109155951A (en) * | 2016-05-27 | 2019-01-04 | 华为技术有限公司 | transmission method, base station and terminal |
| CN109155951B (en) * | 2016-05-27 | 2021-01-29 | 华为技术有限公司 | Transmission method, base station and terminal |
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Application publication date: 20081029 |