CN101296485A - State query method and switch method - Google Patents
State query method and switch method Download PDFInfo
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- CN101296485A CN101296485A CNA2007100972662A CN200710097266A CN101296485A CN 101296485 A CN101296485 A CN 101296485A CN A2007100972662 A CNA2007100972662 A CN A2007100972662A CN 200710097266 A CN200710097266 A CN 200710097266A CN 101296485 A CN101296485 A CN 101296485A
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Abstract
The invention provides a status query method for status query in a mobile communication system and a switching method for the switching of the mobile communication system. The status query method comprises the following steps: step (S402) when a terminal needs to be switched to a target base station, a source base station transmits a switching instruction that is added with the query information of wireless link layer status; step (S404) the terminal receives the switching instruction and reports a wireless link layer status report to the source base station before a switching access is transmitted to the target base station. Therefore, through the method of the invention, RLC layer status query information is combined to a switching instruction message, and the RLC status query information transmitted from the RLC layer of the source base station can be omitted during the switching process, thus shortening the time interrupt for the switching.
Description
Technical field
The present invention relates to distributed cellular radio communication system, more specifically, relate to a kind of method for inquiring status and changing method.
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.
When terminal because a variety of causes need be when source base station switches to a target BS, communication that terminal needs earlier and source base station breaks, insert target BS according to the handover information (being commonly referred to as switching command message) that obtains from source base station then, that is, this is a direct-cut operation.The chain of command processing procedure of switching can adopt the process of synchronous switching, that is, base station and terminal are consulted one and switched the time started when switching, and is switching before the time started, keeps in communication in terminal and cell-of-origin; Switching the communication link that time started terminal and cell-of-origin disconnect up-downgoing, turn to Target cell then.Certainly, also can adopt the method for asynchronous switching, i.e. the uncertain switching time started between base station and the terminal, terminal oneself decides the switching time started according to the temporal information of the Target cell that measures and the schedule information of Random Access Channel.Yet, because Random Access Channel is discontinuous on time domain, so in general terminal can not left the cell-of-origin yet after receiving switching command at once.
In addition, 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 preceding the forwarding on the target BS of Service Data Unit (being called for short SDU) that does not also have in the packet convergence-level on the down direction (being called for short PDCP) to confirm, detailed process as shown in Figure 2.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.If the PDU of certain RLC of terminal responds, lost such as the affirmation message that becomes PDU M, the base station can think that this RLC PDU M does not send success so, thereby also can think the PDCP SDU relevant with this RLC PDU, such as SDU N does not send successfully yet.If this incident occurs in the handoff procedure, source base station will be forwarding target BS to before the PDCP SDU N so.Terminal is after switching to target BS, and target BS can resend PDPC SDU N to terminal, thereby overlapping phenomenon has taken place.This overlapping phenomenon has been wasted valuable wireless interface resource.Because transmit unwanted PDCP SDU bag, also wasted the transfer resource of network internal simultaneously in addition.
A kind of method of avoiding the problems referred to above is the status report of a RLC of terminal to report before switching, thereby the state at the rlc layer agreement carries out synchronously between source base station and the terminal.In general wireless telecommunication system, source base station can carry out inquiry initiatively by the control PDU of rlc layer agreement.Below be the switching flow that adopts the rlc layer active inquiry, detailed process may further comprise the steps as shown in Figure 3:
Step S302, terminal sends measurement report to source base station, and wherein, source base station judges that according to measurement report and switching control strategy needs switch, and the selected target BS that switches;
Step S304, source base station send handoff request to target BS, and wherein, target BS is prepared the incision Radio Resource after judging that permission is switched;
Step S306: target BS sends Handover Request Acknowledge to source base station, comprises a transparent container in the message, comprises in this container that target BS sends to the switching command message of terminal;
Step S308: source base station sends switching command to terminal, and above-mentioned step S302 is the signaling process between radio resource control layer (abbreviation RRC) agreement of source base station and terminal to step S308;
Step S310: the RRC protocol entity of source base station sends a primitive for the rlc layer protocol entity, requires rlc layer to send interim RLC status poll control messages;
Step S312: terminal can be received STATUS ENQUIRY message at rlc layer after receiving the switching command of rrc layer;
Step S314: the status report messages of terminal responds rlc layer;
Step S316: terminal begins to insert target BS;
Step S318: target BS sends to terminal and switches access confirmation message; And
Step S320: terminal sends handoff completion message to target BS.
Yet when switching, the radio propagation conditions between terminal and the source base station has dropped to certain degree, and might also continue decline, thereby, when the source base station decision is switched, communication time in the middle of terminal and the source base station is short more, and is favourable more to the decline that prevents systematic function.According to method shown in Figure 3, source base station also needs to send the STATUS ENQUIRY message of a rlc layer after having sent switching command.And the STATUS ENQUIRY message that sends rlc layer needs the regular hour.Distributed wireless telecommunication system, nearly 30 milliseconds of the break period of the direct-cut operation between the base station, and the STATUS ENQUIRY message that sends a rlc layer needs a mixed automatic retransmission (being called for short HARQ) loopback cycle (being called for short RTT) at least, about 3 milliseconds, so just increased by about 10% HO-break duration.
Thereby being badly in need of a kind of method can address the above problem, thereby reaches the purpose that shortens HO-break duration.
Summary of the invention
In view of the above problems, the present invention proposes a kind of method for inquiring status and changing method.Because the rlc layer status poll process of handoff procedure itself is triggered by handoff procedure, the status poll that is to say rlc layer always appears at after the source base station transmission switching command, so the present invention merges the STATUS ENQUIRY message of rlc layer and the switching command message of rrc layer, like this in handoff procedure, just can be omitted in RLC STATUS ENQUIRY message of extra transmission on the source base station, thereby shorten HO-break duration.
One aspect of the present invention provides a kind of method for inquiring status, and it can may further comprise the steps: step S402, and when terminal need be switched to target BS, source base station sent the additional switching command that the wireless link layer state Query Information is arranged to terminal; And step S404, terminal before initiating to switch access to target BS, reports the wireless link layer state report to source base station after receiving switching command.
Wherein, switching command is a radio resource control layer message.The wireless link layer state report is a radio link layer message.
Another aspect of the present invention provides a kind of changing method, be used for switching at mobile communcations system, it can may further comprise the steps: step S502, when source base station when coming the measurement report of self terminal and switching control strategy to judge that needs switch, the selected target base station, and carry out alternately with target BS; Step S504, source base station sends the additional switching command that the wireless link layer state Query Information is arranged to terminal; Step S506, terminal before initiating to switch access to target BS, reports the wireless link layer state report to source base station after receiving switching command; And step S508, terminal and target BS carry out alternately to finish switching.
Wherein, carry out mutual step with target BS among the step S502 and can comprise following processing: source base station sends handoff request to target BS; And the target BS judgement allows to send switching request acknowledgement message to source base station after the switching.
According to another aspect of the present invention, comprise in the switching request acknowledgement message that target BS sends to the switching command message of terminal.
In addition, in step S508, can comprise following processing: terminal sends to switch to target BS and enters message to begin to insert target BS; Target BS switches access confirmation message receiving to switch to send to terminal after entering message; And terminal sends handoff completion message to target BS after switching is finished.
Wherein, switching command is a radio resource control layer message, and the wireless link layer state report is a radio link layer message.
Terminal is after receiving switching command, and radio resource control layer is passed to radio link layer with the wireless link layer state Query Information.
Thereby, by method of the present invention, rlc layer status poll information is merged in the switching command message, in handoff procedure, can omit the RLC STATUS ENQUIRY message that sends from the rlc layer of source base station, thereby shorten HO-break duration.
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 that target BS repeats to receive PDCP SDU under the situation that does not have the rlc layer status poll;
Fig. 3 is the signal flow graph of the method for source base station active inquiry RLC state in the handoff procedure of prior art;
Fig. 4 is the flow chart according to method for inquiring status of the present invention;
Fig. 5 is the flow chart according to changing method of the present invention; And
Fig. 6 is the signal flow graph that comprises the method for inquiry RCL state according to the switching command message of the source base station of the embodiment of the invention.
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.
Fig. 4 is the flow chart according to method for inquiring status of the present invention.As shown in Figure 4, this method may further comprise the steps:
Step S402, when terminal need be switched to target BS, source base station sent the additional switching command that the wireless link layer state Query Information is arranged to terminal; And
Step S404, terminal before initiating to switch access to target BS, reports the wireless link layer state report to source base station after receiving switching command.
Wherein, switching command is a radio resource control layer message.The wireless link layer state report is a radio link layer message.
Fig. 5 is the flow chart according to changing method of the present invention.As shown in Figure 5, this method may further comprise the steps:
Step S502, when source base station when coming the measurement report of self terminal and switching control strategy to judge that needs switch, selected target base station, and carry out alternately with target BS;
Step S504, source base station sends the additional switching command that the wireless link layer state Query Information is arranged to terminal;
Step S506, terminal before initiating to switch access to target BS, reports the wireless link layer state report to source base station after receiving switching command; And
Step S508, terminal and target BS carry out alternately to finish switching.
Wherein, carry out mutual step with target BS among the step S502 and comprise following processing: source base station sends handoff request to target BS; And the target BS judgement allows to send switching request acknowledgement message to source base station after the switching.Comprise in this switching request acknowledgement message that target BS sends to the switching command message of terminal.
In addition, in step S508, can comprise following processing: terminal sends to switch to target BS and enters message to begin to insert target BS; Target BS switches access confirmation message receiving to switch to send to terminal after entering message; And terminal sends handoff completion message to target BS after switching is finished.
Wherein, switching command is a radio resource control layer message, and the wireless link layer state report is a radio link layer message.
Terminal is after receiving switching command, and radio resource control layer is passed to radio link layer with the wireless link layer state Query Information.
Fig. 6 is the signal flow graph that comprises the method for inquiry RCL state according to the switching command message of the source base station of the embodiment of the invention.As shown in Figure 6, specifically may further comprise the steps:
Step S602, terminal sends measurement report to source base station, and wherein, source base station judges that according to measurement report and switching control strategy needs switch, and the selected target BS that switches;
Step S604, source base station send handoff request to target BS, after target BS is judging to allow switching, prepare the incision Radio Resource;
Step S606, target BS send Handover Request Acknowledge to source base station, comprise a transparent container in the message, comprise in this container that target BS sends to the switching command message of terminal;
Step S607, source base station send switching command to terminal, in this switching command, and additional RLC-POLLING information unit;
Step S610, terminal sends control primitive a: RRC-RLC-POLLING-REQUEST can for the rlc layer agreement after receiving the switching command of rrc layer, requires the rlc layer agreement to report a RLC status report;
Step S612, the rlc layer of terminal sends RLC-STATUS-REPROT message;
Step S614, terminal begins to insert target BS;
Step S616, target BS send to terminal and switch access confirmation message; And
Step S618, terminal sends handoff completion message to target BS.
In sum, adopt method of the present invention, can in handoff procedure, omit the RLC STATUS ENQUIRY message that sends from the rlc layer of source base station, thereby shorten HO-break duration.
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 (10)
1. a method for inquiring status is used for carrying out status poll at mobile communcations system, it is characterized in that, may further comprise the steps:
Step S402, when terminal need be switched to target BS, source base station sent the additional switching command that the wireless link layer state Query Information is arranged to described terminal; And
Step S404, described terminal before initiating to switch access to described target BS, reports the wireless link layer state report to described source base station after receiving described switching command.
2. method for inquiring status according to claim 1 is characterized in that, described switching command is a radio resource control layer message.
3. method for inquiring status according to claim 1 is characterized in that, described wireless link layer state report is a radio link layer message.
4. method for inquiring status according to claim 1 is characterized in that, described terminal is after receiving described switching command, and radio resource control layer is passed to radio link layer with described wireless link layer state Query Information.
5. a changing method is used for switching at mobile communcations system, it is characterized in that,
May further comprise the steps:
Step S502, when source base station when coming the measurement report of self terminal and switching control strategy to judge that needs switch, selected target base station, and carry out alternately with described target BS;
Step S504, described source base station sends the additional switching command that the wireless link layer state Query Information is arranged to described terminal;
Step S506, described terminal before initiating to switch access to described target BS, reports the wireless link layer state report to described source base station after receiving described switching command; And
Step S508, described terminal and described target BS carry out alternately to finish switching.
6. changing method according to claim 5 is characterized in that, carries out mutual step with described target BS and comprise following processing in described step S502:
Described source base station sends handoff request to described target BS; And
Described target BS sends switching request acknowledgement message to described source base station after judging that permission is switched.
7. changing method according to claim 6 is characterized in that, comprises in the described switching request acknowledgement message that described target BS sends to the switching command message of described terminal.
8. changing method according to claim 7 is characterized in that, in described step S508, comprises following processing:
Described terminal sends to switch to described target BS and enters message to begin to insert described target BS;
Described target BS switches access confirmation message receiving to send to described terminal after described switching enters message; And
Described terminal sends handoff completion message to described target BS after switching is finished.
9. changing method according to claim 5 is characterized in that, described switching command is a radio resource control layer message, and the report of described wireless link layer state is a radio link layer message.
10. changing method according to claim 5 is characterized in that, described terminal is after receiving described switching command, and radio resource control layer is passed to radio link layer with described wireless link layer state Query Information.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100972662A CN101296485A (en) | 2007-04-28 | 2007-04-28 | State query method and switch method |
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| CNA2007100972662A CN101296485A (en) | 2007-04-28 | 2007-04-28 | State query method and switch method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771982B (en) * | 2009-01-07 | 2013-04-17 | 华为技术有限公司 | Method for realizing emergency alarm as well as system and device therefor |
| WO2017201743A1 (en) * | 2016-05-27 | 2017-11-30 | 华为技术有限公司 | Transmission method, base station and terminal |
| WO2018126450A1 (en) * | 2017-01-06 | 2018-07-12 | 华为技术有限公司 | Wireless communication method and device |
-
2007
- 2007-04-28 CN CNA2007100972662A patent/CN101296485A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771982B (en) * | 2009-01-07 | 2013-04-17 | 华为技术有限公司 | Method for realizing emergency alarm as well as system and device therefor |
| WO2017201743A1 (en) * | 2016-05-27 | 2017-11-30 | 华为技术有限公司 | Transmission method, base station and terminal |
| WO2018126450A1 (en) * | 2017-01-06 | 2018-07-12 | 华为技术有限公司 | Wireless communication method and device |
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Application publication date: 20081029 |