CN101494884B - Method for processing switch exception - Google Patents
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- CN101494884B CN101494884B CN200810004227A CN200810004227A CN101494884B CN 101494884 B CN101494884 B CN 101494884B CN 200810004227 A CN200810004227 A CN 200810004227A CN 200810004227 A CN200810004227 A CN 200810004227A CN 101494884 B CN101494884 B CN 101494884B
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Abstract
The invention discloses a switching abnormity call processing method. In the method, source base station sends a switching request message carrying terminal context information and timer information to target/alternative base station to initiate a switching process, and starting the first timer after sending a switching command to terminal; while the switching fails, the terminal selects a proper cell to initiate a wireless links recovery process, if the first timer times out and the terminal has not successively accesses into the network, the source base station releases the terminal context information; the target base station starts the second timer, if the second timer times out and the terminal has not successively accesses into the network, the target base station releases the terminal context information; Wherein, the second timer is set according to the timer information. Applying the invention, can enable the possible accessing target/alternative base station after terminal switching failure to determine the time length of timer, and determine when to release terminal context, then can avoid resource waste or drop call.
Description
Technical field
The present invention relates to the switching abnormality processing in the distributed cellular wireless telecommunication system, particularly, relate to a kind of method for processing switch exception.
Background technology
Fig. 1 shows the sketch map of distributed cellular wireless telecommunication system.As shown in Figure 1, the distributed cellular wireless telecommunication system mainly is made up of terminal (perhaps being called travelling carriage), base station (BaseStation abbreviates BS as) and core net (Core Network abbreviates CN as).
Can carry out as required between the base station that logic connects or physical connection, the network that the base station is formed is called wireless access network (Radio Access Network abbreviates RAN as), is responsible for Access Layer affairs (for example, the management of Radio Resource etc.); On/descending Radio Resource is responsible for scheduling according to the mode of shared channel by the base station.Each base station can be connected with one or more core net node.Core net is responsible for Non-Access Stratum affairs (for example, mobile management etc.).The terminal is meant the equipment that can carry out communication with network, for example, and mobile phone, personal digital assistant or notebook computer etc.Each terminal can only be connected to one of them base station in the network on up direction.
Switching is one of characteristics of cellular mobile network, is the important step that guarantees service quality.The so-called switching is meant when the terminal is shifted out former Serving cell and will be got into another Serving cell, replaced the process of the link between source base station and the terminal by the link between new base station and the terminal.Through switch can guarantee wireless in the sub-district continuity during with the minizone conversion.
Fig. 2 shows the base station switching flow of present employing.As shown in Figure 2, specifically can comprise following processing (201-212):
201: measurement report is sent to source base station in the terminal;
202: under the situation of source base station according to measurement report and the switching of switching control strategy judgement needs, the selected target BS that switches of source base station;
203: source base station sends handoff request message to target BS, and in handoff request message, carries necessary communication contextual information;
204: because the possibility handoff failure; In order to reduce subscriber equipment (UserEquipment behind the handoff failure; UE) rebuild the required time of link and between the network; Source base station can also send handoff request message and give other some candidate BS, and in handoff request message, carries necessary communication contextual information;
205: after candidate BS receives handoff request message, need not distribute the switching resource needed, only preserve the contextual information at terminal, so that use when recovering behind the Radio Link Failure;
206: target BS is the terminal distribution Radio Resource judging under the situation that allows to switch;
207: target BS sends switching request acknowledgement message to source base station, wherein, comprises in the switching request acknowledgement message that target BS is the Radio Resource of terminal distribution;
208: source base station sends switching command to the terminal, comprises in this switching command that target BS is the Radio Resource of terminal distribution;
209: the terminal is carried out at target BS and is switched;
210: the terminal is sent switching to target BS and is inserted message on the target BS assigned radio resource;
211: target BS sends to the terminal and switches access confirmation message;
212: handoff completion message is sent to target BS in the terminal, and switching flow finishes.
Under the situation of handoff failure, for example, owing to temporary transient wireless quality reason terminal can't obtain with target BS synchronously, step 210 can't be carried out to 212.And if source base station is not got back at the terminal behind the handoff failure, then source base station can't know also whether switching is successful, and therefore, target BS also can't be judged the context that when should discharge this terminal.
For the situation of above-mentioned handoff failure, regulation adopts the processing procedure similar with Radio Link Failure in long evolving system (Long TermEvolution abbreviates LTE as).Fig. 3 shows the processing procedure of Radio Link Failure, and is as shown in Figure 3, under the situation of Radio Link Failure, comprises following processing (301-305):
301: the terminal keeps being connected with the base station, is in normal condition;
302: physical layer continues to detect the state of Radio Link, if found then to report high-rise key-course unusually, like this, base station and terminal can find that all Radio Link is unusual;
303: after high-rise key-course found that link is unusual, base station and terminal started timer T1 respectively, if physical layer has detected wireless link recovery normally before T1 is overtime, then thought and interrupted base station and not being connected of terminal, and it is normal that communication keeps;
304:, think then Radio Link Failure has taken place that base station and terminal start timer T2 respectively if physical layer does not still detect wireless link recovery in the overtime back of T1; Before T2 was overtime, the terminal can not keep communicating by letter with original resident base station as original with having no effect, could be connected to wireless access network again but need to carry out wireless connections recovery process.Wireless connections recovery process allows the terminal to reselect a sub-district and is linked into network, and not necessarily is linked into original resident base station;
305: if terminal, the overtime back of T2 does not still have successfully to recover and being connected of Access Network, think that then original being connected fully of terminal and Access Network interrupt, call drop has promptly taken place, the terminal can be according to service needed re-accessing network once more.
In the said process 302 and 303 is called the phase I, and the characteristic in this stage is that the terminal can recover to be connected with original resident base station with having no effect.304 are called second stage, and the characteristic in this stage is the wireless connections recovery process re-accessing network that the terminal can be through protocol definition, keep original professional unaffected.Before this two stages, think that the terminal still is in connection status, promptly still there is the context at this terminal in Access Network, can recover professional.After these two stages accomplish, if do not have all the time can re-accessing network at the terminal, then Access Network will discharge the context at terminal, and the terminal will get into idle condition.
That is, can find out, fail if switch through top description; Can use the processing procedure of Radio Link Failure, a sub-district will be selected in the terminal, possibly be original resident sub-district; It also possibly be the Target cell that switches; Also possibly be other sub-districts, attempt through wireless connections recovery process re-accessing network, thereby avoid call drop.
In the processing of above-mentioned Radio Link Failure, the timer T1 of definition and T2 are the parameter of terminal in original resident sub-district (cell-of-origin) definition, possibly give the terminal by the sub-district with its configuration through Cell Broadcast CB or special-purpose signaling.
In above-mentioned processing, if handoff failure, other sub-districts (comprising Target cell and alternative cell) possibly selected to be linked in the terminal, but the T2 of different districts configuration maybe be inconsistent.Before Target cell T2 is overtime; The terminal all might be linked into network; Therefore other alternative cell that possibly insert should not discharge the context at terminal in advance before T2 is overtime; But in fact, other alternative cell that possibly insert can't be confirmed the time span of T2, also just can't determine when to discharge the terminal context.The alternative cell that if possible inserts is preserved the terminal context by the longest or long time, then possibly cause the wasting of resources, and the sub-district of if possible inserting discharges the terminal context by the shortest or short time, then possibly cause call drop behind the handoff failure.
Summary of the invention
Consider exist in the correlation technique in Radio Link Failure is handled; Owing to can't determining when the context that discharges the terminal, the alternative cell that possibly insert to cause the problem of the wasting of resources or call drop to propose the present invention; For this reason, the present invention aims to provide a kind of method for processing switch exception.
According to an aspect of the present invention, a kind of method for processing switch exception is provided, has been used under the situation of the handoff failure of terminal from the source base station to the target BS, switching abnormality processing.
Method for processing switch exception according to the embodiment of the invention comprises following processing: source base station sends handoff request message to initiate handoff procedure to target BS; The contextual information of carried terminal and timer information in handoff request message, and after sending switching command, start first timer to the terminal; Under the situation of handoff failure, the terminal selects proper cell to initiate the wireless link recovery process, if the terminal does not have successful access network when first timer is overtime, then source base station discharges the contextual information at terminal; Target BS starts second timer, if the terminal does not have successful access network when second timer is overtime, then target BS discharges the contextual information at terminal, wherein, according to timer information second timer is set.
Preferably, target BS starts second timer when receiving handoff request message.
Preferably; Source base station also sends to one or more candidate BS with handoff request message; Candidate BS starts second timer when receiving handoff request message, if the terminal does not have successful access network when second timer is overtime, then discharge the contextual information at terminal.
Comprise Te in the timer information, and Te=a*T+b, wherein, Te is the duration of second timer, and T is the duration of first timer, and a, b are real number.Preferably, the time difference between source base station, target BS and/or the candidate BS that causes according to handover delay is provided with a, b, and according to simulation optimization or actual measured results a, b is adjusted.
In addition, under the situation of Radio Link Failure, source base station and terminal also start the 3rd timer, and, T=c*T2+d, wherein, T2 is the 3rd length of timer, and T is the duration of first timer, and c, d are real number.
According to embodiments of the invention, a kind of method for processing switch exception is provided, be used under the situation of the handoff failure of terminal from the source base station to the target BS, switching abnormality processing.
Method for processing switch exception according to the present invention comprises following processing: source base station sends handoff request message to initiate handoff procedure to target BS; The contextual information of carried terminal in handoff request message, and after sending switching command, start timer to the terminal; Under the situation of handoff failure, the terminal selects proper cell to initiate the wireless link recovery process, if the terminal does not have successful access network during timer expiry, then source base station discharges the contextual information at terminal, and sends the free context notice to target BS.
Preferably, the free context notification package is contained in the independent free context notification message, or is carried in other message as cell.
Preferably, said method further comprises: in response to the free context notice, target BS discharges the contextual information at terminal.
Preferably, source base station also sends to one or more candidate BS with handoff request message, and source base station also sends to candidate BS with free context notice, and in response to the free context notice, candidate BS discharges the contextual information at terminal.
Through above-mentioned at least one technical scheme provided by the invention, can be so that handover-target base station that possibly insert behind the handoff failure of terminal and/or candidate BS can determine when the context that discharges the terminal, and then can avoid the problem of the wasting of resources or call drop.
Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the sketch map according to the LTE system of correlation technique;
Fig. 2 is the sketch map according to the base station switching flow of correlation technique;
Fig. 3 is the processing procedure sketch map according to the Radio Link Failure of correlation technique;
Fig. 4 is the flow chart according to the method for processing switch exception of the inventive method embodiment one;
Fig. 5 is the interaction diagrams according to the method for processing switch exception of the inventive method embodiment one;
Fig. 6 is the flow chart according to the method for processing switch exception of the inventive method embodiment two;
Fig. 7 is the interaction diagrams according to the method for processing switch exception of the inventive method embodiment two.
Embodiment
As stated; In present handoff failure processing or Radio Link Failure processing, because the time span that handover-target base station that possibly insert and/or candidate BS can't be confirmed timer, promptly; Can't determine when the context that discharges the terminal, cause the wasting of resources possibly or call drop occurs.In view of this, the invention provides a kind of method for processing switch exception, it can be so that handover-target base station and/or candidate BS determine when the context that discharges the terminal, and then can avoid the problem of the wasting of resources or call drop.
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 explanation and explains the present invention, and be not used in qualification the present invention.
Method embodiment one
According to the embodiment of the invention, a kind of method for processing switch exception at first is provided, be used under the situation of the handoff failure of terminal from the source base station to the target BS, switching abnormality processing.
Fig. 4 is the flow chart according to the method for processing switch exception of the embodiment of the invention, and is as shown in Figure 4, and this method comprises following processing (step S402-step S408):
Step S402; Source base station sends handoff request message to initiate handoff procedure to target BS; The contextual information of carried terminal and timer information in handoff request message, and after sending switching command, start first timer (representing) with T to the terminal in good time; In this step, because source base station and do not know to switch and whether can fail, so after sending switching command, start timer;
Step S404, under the situation of handoff failure, the terminal selects certain proper cell to initiate the wireless link recovery process; Here, proper cell is meant the sub-district that can select according to the terminal of pre-defined rule or protocol definition;
Step S406, if the terminal does not have successful access network when first timer is overtime, then source base station discharges the contextual information at terminal;
Step S408, target BS start second timer (representing with Te), if the terminal does not have successful access network when second timer is overtime, then target BS discharges the contextual information at terminal, wherein, according to timer information second timer is set.
In step S408, target BS can start second timer when receiving handoff request message.
Preferably; In step S402, source base station also sends to one or more candidate BS with handoff request message, and in step S408; Candidate BS is when receiving handoff request message; Also start second timer Te,, then discharge the contextual information at terminal if the terminal does not have successful access network when second timer is overtime.
Wherein, comprise Te in the above-mentioned timer information, and Te=a*T+b, wherein, Te is the duration of second timer, and T is the duration of first timer, and a, b are real number, that is, exist between first timer and the second timer to equate or linear relationship.Preferably, the time difference between source base station, target BS and/or the candidate BS that a, b can cause according to handover delay is provided with, and adjusts according to simulation optimization or actual measured results.
Need to prove that in addition above-mentioned processing procedure only is exemplary, for the ease of describing; Describe through introducing step number, should be appreciated that the step number of introducing and be not used in to limit the order that the present invention realizes; For example; For the startup of second timer, can, target BS start after receiving handoff request message in good time, also can start in other suitable moment.
In the present invention, from another aspects, under the situation of Radio Link Failure, source base station and terminal also start the 3rd timer; And, T=c*T2+d, wherein; T2 is the duration of the 3rd timer (Radio Link Failure timer), and T is the duration of first timer, and c, d are real number; That is to say that preferably have above-mentioned linear relationship between the duration of first timer and the 3rd length of timer, the duration of the two can equate.
Fig. 5 shows the detailed interaction flow of above-mentioned processing.As shown in Figure 5, comprise following operation according to the method for processing switch exception of the embodiment of the invention:
501: the terminal is sent measurement report and is given source base station;
502: source base station switches according to measurement report and switching control strategy judgement needs, and the selected target BS that switches;
503: source base station sends handoff request and gives target BS, comprises necessary communication context in the handoff request, comprises a timer information (for example, timer duration Te) simultaneously;
504: in order to prevent handoff failure, source base station can also send handoff request and give some other candidate BS, comprises necessary communication context in the message, timer information (for example, timer duration Te);
505: after candidate BS is received handoff request, need not distribute the switching resource needed, only preserve the context at terminal so that use when recovering behind the Radio Link Failure;
506: target BS is the terminal distribution Radio Resource after judging that permission is switched;
507: target BS sends Handover Request Acknowledge and gives source base station, comprises in the message that target BS is the Radio Resource of terminal distribution.
508: source base station sends switching command and gives the terminal, comprises in the message that target BS is the Radio Resource of terminal distribution.
509: the terminal can't be carried out at target BS and switched, and handoff failure gets into the Radio Link Failure flow process, and source base station starts timer T2;
510: after T2 was overtime, the terminal does not have can re-accessing network, and source base station discharges the terminal context;
511: in the time that Te confirms overtime after, the terminal does not have can re-accessing network, target BS and candidate BS discharge the terminal context respectively.
Can find out through above-described technical scheme; Through timer information being informed the target BS or the candidate BS that possibly insert behind the handoff failure of terminal; Make this base station can confirm the time span of timer; And then can confirm to discharge the contextual time of terminal, thereby can avoid the wasting of resources or call drop.To achieve these goals, the present invention also provides another kind of method, and it does not change the setting to timer, but directly passes through the mode informing base station release terminal context of signaling or message, specifically referring to method embodiment two.
According to embodiments of the invention, a kind of method for processing switch exception is provided, be used under the situation of the handoff failure of terminal from the source base station to the target BS, switching abnormality processing.
Fig. 6 shows the flow chart according to method for processing switch exception of the present invention; As shown in Figure 6, comprise following processing (step S602-step S606):
Step S602: source base station sends handoff request message with the initiation handoff procedure to target BS, the contextual information of carried terminal in handoff request message, and after sending switching command, starting timer to the terminal;
Step S604: under the situation of handoff failure, the terminal selects proper cell to initiate the wireless link recovery process;
Step S606: if the terminal does not have successful access network during timer expiry, then source base station discharges the contextual information at terminal, and sends the free context notice to target BS.
Wherein, free context notice above-mentioned can be contained in the independent free context notification message, or is carried in other present existing message (for example, handover cancelling message) as cell.
After step S606, in response to the free context notice, target BS discharges the contextual information at terminal.
Can find out,, realize that equally the base station can confirm to discharge the purpose of contextual time of terminal through top technical scheme.
Fig. 7 further shows the detailed interaction flow of above-mentioned processing.As shown in Figure 7, comprise following operation according to the method for processing switch exception of the embodiment of the invention:
701: the terminal is sent measurement report and is given source base station;
702: source base station switches according to measurement report and switching control strategy judgement needs, and the selected target BS that switches;
703: source base station sends handoff request and gives target BS, comprises necessary communication context in the message;
704: in order to prevent handoff failure, source base station can also send handoff request and give some other candidate BS, comprises necessary communication context in the message;
705: after candidate BS is received handoff request, need not distribute the switching resource needed, only preserve the context at terminal, so that use when recovering behind the Radio Link Failure;
706: target BS is the terminal distribution Radio Resource after judging that permission is switched;
707: target BS sends Handover Request Acknowledge and gives source base station, comprises in the message that target BS is the Radio Resource of terminal distribution;
708: source base station sends switching command and gives the terminal, comprises in the message that target BS is the Radio Resource of terminal distribution;
709: the terminal can't be carried out at target BS and switched, and handoff failure gets into the Radio Link Failure flow process, and source base station starts timer T2;
710: source base station is after T2 is overtime, and the affirmation message of yet not receiving handover success is not inserted at the terminal again, then thinks and sends a piece of news indicating terminal call drop to all target BS and candidate BS by the handoff failure call drop;
711: source base station, target BS and candidate BS discharge the terminal context respectively.
Preferably, source base station also sends to one or more candidate BS with handoff request message, and source base station also sends to candidate BS with the free context notice, and in response to the free context notice, candidate BS discharges the contextual information at terminal.
As stated; By means of the present invention; Can also can determine when the context that discharges the terminal so that target BS that possibly insert behind the handoff failure of terminal and candidate BS can be confirmed the time span of timer, and then can avoid the problem of the wasting of resources or call drop.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Several within spirit of the present invention and principle, 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 processing switch exception is used under the situation of the handoff failure of terminal from the source base station to the target BS, switching abnormality processing, it is characterized in that, comprising:
Source base station sends handoff request message with the initiation handoff procedure to target BS, the contextual information and the timer information of carried terminal in said handoff request message, and after sending switching command, starting first timer to the terminal;
Under the situation of handoff failure, said terminal selects proper cell to initiate the wireless link recovery process, if said terminal does not have successful access network when said first timer is overtime, then said source base station discharges the contextual information at said terminal;
Said target BS starts second timer, if said terminal does not have successful access network when said second timer is overtime, then said target BS discharges the contextual information at said terminal, and wherein, said second timer is according to said timer information setting.
2. method for processing switch exception according to claim 1 is characterized in that, said target BS starts said second timer when receiving said handoff request message.
3. method for processing switch exception according to claim 1; It is characterized in that; Said source base station also sends to one or more candidate BS with said handoff request message; Said candidate BS starts said second timer when receiving said handoff request message, and if said second timer do not have successful access network in said terminal when overtime, then discharge the contextual information at said terminal.
4. method for processing switch exception according to claim 1 is characterized in that, comprises Te in the said timer information, and Te=a*T+b, and wherein, Te is the duration of said second timer, and T is the duration of said first timer, and a, b are real number.
5. method for processing switch exception according to claim 4; It is characterized in that; The time difference between said source base station, said target BS and/or the candidate BS that causes according to handover delay is provided with a, b, and according to simulation optimization or actual measured results a, b is adjusted.
6. according to each described method for processing switch exception in the claim 1 to 5, it is characterized in that, under the situation of Radio Link Failure; Said source base station and said starting terminal the 3rd timer, and, T=c*T2+d; Wherein, T2 is said the 3rd length of timer, and T is the duration of said first timer, and c, d are real number.
7. a method for processing switch exception is used under the situation of the handoff failure of terminal from the source base station to the target BS, switching abnormality processing, it is characterized in that said method comprises:
Source base station sends handoff request message with the initiation handoff procedure to target BS, the contextual information of carried terminal in said handoff request message, and after sending switching command, starting timer to the terminal;
Under the situation of handoff failure; Said terminal selects proper cell to initiate the wireless link recovery process; If the said terminal of said timer expiry does not have successful access network, then said source base station discharges the contextual information at said terminal, and sends the free context notice to said target BS.
8. method for processing switch exception according to claim 7 is characterized in that, said free context notification package is contained in the independent free context notification message, or is carried in other message as cell.
9. method for processing switch exception according to claim 7 is characterized in that, further comprises:
In response to said free context notice, said target BS discharges the contextual information at said terminal.
10. method for processing switch exception according to claim 7; It is characterized in that; Said source base station also sends to one or more candidate BS with said handoff request message; And said source base station also sends to candidate BS with said free context notice, and in response to said free context notice, said candidate BS discharges the contextual information at said terminal.
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| CN200810004227A CN101494884B (en) | 2008-01-21 | 2008-01-21 | Method for processing switch exception |
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| CN200810004227A CN101494884B (en) | 2008-01-21 | 2008-01-21 | Method for processing switch exception |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102348231B (en) * | 2010-07-28 | 2016-07-20 | 中兴通讯股份有限公司 | A kind of subscriber equipment and the method reporting RLF correlation measurement information thereof |
| CN102857994A (en) * | 2011-06-30 | 2013-01-02 | 中兴通讯股份有限公司 | Methods and systems for channelizing network access of terminal |
| CN104302011A (en) * | 2013-07-16 | 2015-01-21 | 中兴通讯股份有限公司 | Method, system and device of reestablishing radio resource control connection |
| CN106413008A (en) * | 2015-07-27 | 2017-02-15 | 中兴通讯股份有限公司 | Timer value processing method and device |
| CN107371208B (en) * | 2016-05-13 | 2022-04-29 | 中兴通讯股份有限公司 | Switching method and device |
| CN107454627B (en) * | 2016-06-01 | 2019-12-27 | 美的集团股份有限公司 | Optimization system and optimization method for synchronous communication timeout |
| US11044642B2 (en) * | 2016-10-11 | 2021-06-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Data transmission during handover |
| AU2018442251A1 (en) | 2018-09-18 | 2021-03-11 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Switching processing method, terminal device and network device |
| CN111641977B (en) * | 2019-03-01 | 2022-01-07 | 大唐移动通信设备有限公司 | Cell switching processing method, device and equipment |
| CN112425206B (en) * | 2019-05-07 | 2023-10-24 | Oppo广东移动通信有限公司 | Context management method, device and storage medium |
| CN112399453B (en) * | 2019-08-12 | 2022-10-18 | 大唐移动通信设备有限公司 | Method and device for processing cell after access failure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1889785A (en) * | 2006-07-27 | 2007-01-03 | 华为技术有限公司 | Method and system for processing switch failure in group switching process |
| CN101052208A (en) * | 2006-04-06 | 2007-10-10 | 华为技术有限公司 | Switching method and switching network |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101052208A (en) * | 2006-04-06 | 2007-10-10 | 华为技术有限公司 | Switching method and switching network |
| CN1889785A (en) * | 2006-07-27 | 2007-01-03 | 华为技术有限公司 | Method and system for processing switch failure in group switching process |
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