CN103053188A - Method and device for wireless link recovery - Google Patents
Method and device for wireless link recovery Download PDFInfo
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- CN103053188A CN103053188A CN201180000934XA CN201180000934A CN103053188A CN 103053188 A CN103053188 A CN 103053188A CN 201180000934X A CN201180000934X A CN 201180000934XA CN 201180000934 A CN201180000934 A CN 201180000934A CN 103053188 A CN103053188 A CN 103053188A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W76/10—Connection setup
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Abstract
A method and device for a wireless link recovery are provided, wherein the method includes: a terminal performs detection for the wireless link; when detecting that a problem occurs in the wireless link, the terminal tries to recover the wireless link alternately among the first predetermined frequency points during the period waiting for the wireless link recovery. In the embodiments of the present invention, for a Cognitive Radio (CR) wireless communication system, when detecting that a problem occurs in the wireless link, i.e. the terminal can not perform normal communication with a base station, the terminal tries to recover the wireless link alternately among the first predetermined frequency points; and it is possible for the terminal to hand over to a destination frequency point quickly, to accomplish the spectrum handover together with the base station, to recover the service and to keep the continuity of the service.
Description
A kind of wireless link recovery method and engineering device technique field
The present invention relates to communication technical field, more particularly to a kind of wireless link recovery method and device.
Background technology
Cognitive radio（CR, Cognitive Radio) it is to solve the nervous most promising technology of current frequency spectrum resource.Research shows have and be largely underutilized in the frequency spectrum of fixed allocation at present, which results in the significant wastage of frequency spectrum resource.Cognitive radio is by cognitive radio spectrum environment, it can be found that these vacant frequency ranges, and do not disturbing primary user（PU, Primary User) on the premise of dynamic access these frequency ranges, so as to improve the availability of frequency spectrum.By cognitive radio system dynamically using the user of frequency spectrum resource, it is referred to as time user（SU, Second User )„
Frequency spectrum perception is the key technology of cognitive radio.The purpose of frequency spectrum perception is the active situation of monitoring and primary user's signal in detection special frequency channel, and (primary user's signal is not detected when detecting when idle frequency spectrum is present）, cognitive radio system can use the frequency spectrum；And when detecting primary user's signal and occurring again, cognitive radio system must exit the frequency range within the defined time.But in order to ensure the continuity of business in cognitive radio system, after system exits some frequency range, it is necessary to be immediately switched to work on new available frequency band.
Generally, handoff procedure is：After base station or network side decision-making will switch, switching command is sent to terminal, terminal performs switching according to the requirement of order.But in cognitive radio system, when primary user occurs, and primary user signal it is especially strong when, the base station of cognitive radio system and the communication severe exacerbation of terminal may be caused, it is impossible to communicate again, so as to directly result in service disconnection, therefore, the problem of a kind for the treatment of mechanism is to solve in this case is needed currently exist for, during ensureing that strong primary user's signal occurs to greatest extent, the communication recovery of cognitive radio communication systems, it is to avoid service disconnection.
The content of the invention
The embodiment of the present invention provides a kind of method and device of wireless link recovery, to solve the technical problem for recovering Radio Link when Radio Link is interrupted.
Therefore, the embodiment of the present invention provides a kind of wireless link recovery method, methods described includes：Terminal-pair Radio Link is detected；
When detecting Radio Link and going wrong, waiting in the wireless link recovery time, the terminal is alternately attempted to recover Radio Link between the first frequency set in advance.
Accordingly, the embodiment of the present invention also provides a kind of wireless link recovery device, and described device includes：Detection unit, for being detected to Radio Link；
First link-recovery unit, for when detection unit detects Radio Link and gone wrong, waiting in the wireless link recovery time, alternately attempts to recover Radio Link between the first frequency set in advance.
In the embodiment of the present invention, for CR wireless communication systems, when detecting Radio Link and going wrong, i.e., in the case that terminal can not carry out proper communication with base station, the terminal replace between current frequency and the backup frequency in backup frequency list successively attempts recovery Radio Link；Enable the terminals to be quickly switched into target frequency, frequency spectrum switching is completed together with base station, recovers business, it is ensured that the continuity of business.
Brief description of the drawings
Fig. 1 provides a kind of flow chart of wireless link recovery method for the embodiment of the present invention；
Fig. 2 is a kind of flow chart of the wireless link recovery method of the terminal without perceptional function provided in an embodiment of the present invention；
Fig. 3 is a kind of flow chart of the wireless link recovery method of the terminal with perceptional function provided in an embodiment of the present invention；
Fig. 4 is a kind of structural representation of wireless link recovery device of the embodiment of the present invention.
Embodiment
In order that those skilled in the art more fully understand the scheme of the embodiment of the present invention, the embodiment of the present invention is described in further detail with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is referred to, is a kind of flow chart of wireless link recovery method provided in an embodiment of the present invention, applied to cognitive radio（CR, Cognitive Radio) in wireless communication system, methods described includes：Step 101:Terminal-pair Radio Link is detected；
Step 102:When detecting Radio Link and going wrong, waiting in the wireless link recovery time, the terminal is alternately attempted to recover Radio Link between the first frequency set in advance.
In the embodiment of the present invention, when terminal, which detects Radio Link, to go wrong, waiting in the wireless link recovery time, alternately attempt to recover Radio Link between the first frequency set in advance successively, solve terminal in the case where proper communication can not be carried out with base station, enable the terminals to be quickly switched into target frequency, recover Radio Link, so as to complete frequency spectrum switching together with base station, recover business, keep the continuity of business.
It is preferred that, first frequency set in advance can include：Current frequency and the backup frequency in backup frequency list；Or multiple backup frequencies in backup frequency list；But it is not limited to this.
It is described when detecting Radio Link and going wrong in step 102, when waiting wireless link recovery
In, the terminal alternately attempts recovery Radio Link between the first frequency set in advance to be included：When detecting Radio Link and going wrong, waiting in the wireless link recovery time, the terminal replace between current frequency and the backup frequency in backup frequency list successively attempts recovery Radio Link；Or when detecting Radio Link and going wrong, waiting in the wireless link recovery time, recovery Radio Link is alternately attempted between the multiple backup frequencies of the terminal successively in backup frequency list.
Wherein, recovery Radio Link is alternately attempted between the multiple backup frequencies of the terminal successively in backup frequency list to specifically include：The terminal attempts whether Radio Link can be recovered in current frequency, if can not, then a backup frequency in backup frequency list attempts whether Radio Link can be recovered, if can not, then another backup frequency in backup frequency list attempts whether Radio Link can be recovered, if Radio Link can't be recovered in another backup frequency, return and perform a step of backup frequency in backup frequency list attempts whether Radio Link can be recovered；Until recovering Radio Link waiting in the wireless link recovery time.
The terminal replaces trial recovery Radio Link between current frequency and the backup frequency in backup frequency list and specifically included successively：The terminal attempts whether Radio Link can be recovered in current frequency, if can not, then at least one backup frequency in backup frequency list attempts whether Radio Link can be recovered, if can not, then return to current frequency attempts whether Radio Link can be recovered, if Radio Link can't be recovered in current frequency, return and perform the step of described at least one backup frequency in backup frequency list attempts whether Radio Link can be recovered；Until recovering Radio Link waiting in the wireless link recovery time；
That is, in the step, a kind of situation is：If attempting to recover Radio Link Failure in current frequency, first backup frequency in backup frequency list can be used to attempt to recover Radio Link, if recovering Radio Link Failure in first backup frequency, current frequency is then returned to continue to attempt to recover Radio Link, if still failed, attempt to recover Radio Link using second backup frequency in backup frequency list；If recovering Radio Link Failure in second backup frequency, return to current frequency and continue to attempt to recover Radio Link, if also failed, attempt to recover Radio Link using the 3rd backup frequency in backup frequency list；If recovering Radio Link Failure in the 3rd backup frequency, return to current frequency and continue to attempt to recover Radio Link, the like, until recovering Radio Link or reaching the presetting wait wireless link recovery time.It should be noted that being less than or equal to the default wait wireless link recovery time in the time that current frequency and all backup frequencies attempt to recover Radio Link.
Another situation is：If attempting to recover Radio Link Failure in current frequency, first backup frequency in backup frequency list can be first used to attempt to recover Radio Link, if recovered in first backup frequency
Radio Link Failure, then attempt to recover Radio Link using second backup frequency in backup frequency list；If recovering Radio Link Failure in second backup frequency, current frequency is then returned to continue to attempt to recover Radio Link, if still failed, then attempt to recover Radio Link using the 3rd backup frequency in backup frequency list, if failure, then attempt to recover Radio Link using the 4th backup frequency in backup frequency list, if still failed；Then return to current frequency to continue to attempt to recover Radio Link, if also failed, attempt to recover Radio Link using the 5th backup frequency in backup frequency list；If recovering Radio Link Failure in the 5th backup frequency, attempt to recover Radio Link using the 6th backup frequency in backup frequency list；If recovering Radio Link Failure in the 6th backup frequency, return to current frequency and continue to attempt to recover Radio Link, the like, until recovering Radio Link or reaching the presetting wait wireless link recovery time.It should be noted that being less than or equal to the default wait wireless link recovery time in the time that current frequency and all backup frequencies attempt to recover Radio Link.
On the basis of above-described embodiment, it can also carry out attempting to recover Radio Link using the backup frequency of three or more than three of backup frequency list successively, its implementation process is similar to the above, will not be repeated here.
Wherein, in the above-described embodiments, for the backup frequency attempted, it can also again attempt to recover Radio Link.
Certainly, in above-mentioned all embodiments, if waited in the wireless link recovery time, Radio Link can not be all recovered on all backup frequencies in current frequency and backup frequency list, current frequency is then returned, and enters Radio Link Failure handling process.The Radio Link Failure handling process is also to know technology to those skilled in the art, be will not be repeated here.
It is preferred that, before terminal-pair Radio Link is detected, methods described can also include：The terminal receives the backup frequency list for the different carrier waves that base station is sent, and stores the backup frequency list.
Namely club, in CR wireless communication systems, in order to avoid when strong primary user's signal occurs, system communication is interrupted and can not recovered, CR wireless communication systems can safeguard a backup frequency list can be with proper communication when, and this list is synchronous between the base station and the terminal；In radio link problem, (such as strong primary user's signal occurs, or situations such as big interference or decline）Cause system can not proper communication when, base station can first switch to some backup frequency up；And terminal also can scheme according to the present invention attempt to switch to some backup frequency up, it is intended to recover to communicate again with base station.
It is preferred that, it is described to include：When terminal, which is detected on Radio Link, has primary user's signal to occur, the terminal is alternately attempted to recover Radio Link between the second frequency set in advance；
It is preferred that, second frequency set in advance can include：Backup frequency in backup frequency list
With current frequency；Or multiple backup frequencies in backup frequency list；But it is not limited to this；It is described when detect on Radio Link there is primary user's signal to occur when, the terminal between the described second frequency set in advance alternately attempt recover Radio Link include：
When detect on Radio Link there is primary user's signal to occur when, wait the wireless link recovery time in, replace between the backup frequency of the terminal successively in backup frequency list and current frequency attempt recovery Radio Link；Or
When detect on Radio Link there is primary user's signal to occur when, wait the wireless link recovery time in, between the multiple backup frequencies of the terminal successively in backup frequency list alternately attempt recovery Radio Link.
Wherein, replace trial recovery Radio Link between the backup frequency of the terminal successively in backup frequency list and current frequency to specifically include：
At least one the backup frequency of the terminal in backup frequency list attempts whether Radio Link can be recovered, if can not, then return to current frequency attempts whether Radio Link can be recovered, if Radio Link can not be recovered in current frequency, return and perform described at least one backup frequency in backup frequency list attempts whether Radio Link can be recovered；Until recovering Radio Link waiting in the wireless link recovery time；
That is, in the step, a kind of situation is, when terminal detects on Radio Link and has primary user's signal to occur, first backup frequency of the terminal in backup frequency list attempts whether Radio Link can be recovered, if can not, then return to current frequency attempts whether Radio Link can be recovered, if can not, then second backup frequency in backup frequency list attempts whether Radio Link can be recovered, if can't, then return to current frequency attempts whether Radio Link can be recovered, if can not, then the 3rd backup frequency in backup frequency list attempts whether Radio Link can be recovered, if can't, then return to current frequency attempts whether Radio Link can be recovered, the like, until reaching the wait wireless link recovery time or recovering Radio Link；It should be noted that being less than or equal to the default wait wireless link recovery time in the time that current frequency and all backup frequencies attempt to recover Radio Link.
Another situation is, when terminal detects on Radio Link and has primary user's signal to occur, first backup frequency of the terminal in backup frequency list attempts whether Radio Link can be recovered, if can not, second backup frequency of the terminal in backup frequency list attempts whether Radio Link can be recovered, if can not, then return to current frequency attempts whether Radio Link can be recovered, if can not recover in current frequency, then the 3rd backup frequency in backup frequency list attempts whether Radio Link can be recovered, if can't, then the 4th backup frequency in backup frequency list attempts whether Radio Link can be recovered, if still can not, then return to current frequency attempts whether Radio Link can be recovered, if can not recover in current frequency, then in backup
The 5th backup frequency in frequency list attempts whether Radio Link can be recovered, if can't, the 6th backup frequency in backup frequency list attempts whether Radio Link can be recovered；If Radio Link can not be recovered in the 6th backup frequency, return to current frequency attempts whether Radio Link can be recovered, the like, until recovering Radio Link or reaching the presetting wait wireless link recovery time；It should be noted that being less than or equal to the default wait wireless link recovery time in the time that current frequency and all backup frequencies attempt to recover Radio Link.
On the basis of above-described embodiment, it can also carry out attempting to recover Radio Link using the backup frequency of three or more than three of backup frequency list successively, its implementation process is similar to the above, will not be repeated here.
Wherein, in the above-described embodiments, for the backup frequency attempted, it can also again attempt to recover the process of Radio Link.
Certainly, in above-mentioned all embodiments, if terminal was waited in the wireless link recovery time, it can not all recover Radio Link on all backup frequencies and current frequency in backup frequency list, current frequency is then returned, is continued with according to corresponding radio communication Radio Link Failure flow.The Radio Link Failure handling process is also to know technology to those skilled in the art, be will not be repeated here.
It is preferred that, in the above-described embodiments, methods described can also include：When terminal-pair Radio Link is detected, it is T1 that from Radio Link problem, which occurs, for record to the time spent when Radio Link goes wrong is detected;And it is T2 to record from Radio Link generation problem to the time spent when primary user's signal occurs is detected;
If it is determined that T1 is more than T2, then illustrate that terminal first detects that Radio Link goes wrong, perform the terminal and replace the step of trial recovers Radio Link between current frequency and the backup frequency in backup frequency list successively；It implements process and refers to above-mentioned, is not repeating herein；
If it is determined that when T1 is less than T2, then illustrate that terminal first detects that PU user occurs, perform replace between terminal backup frequency successively in backup frequency list and current frequency and attempt recovery Radio Link.It implements process and refers to above-mentioned, is not repeating herein；
Generally, if primary user occurs, and terminal can also be properly received the data of base station, then terminal should not start the flow of blind handover.If terminal judges that primary user occurs, and terminal is less than the thresholding (Qout in such as LTE) of some setting in multiple subframe reception failures before or received signal quality, it so just can consider that Radio Link goes wrong, and start the blind handover process in embodiment of the present invention.
In the embodiment of the present invention, for CR wireless communication systems, when detecting Radio Link and going wrong, i.e., in the case that terminal can not carry out proper communication with base station, the terminal is successively in current frequency and backup frequency
Alternately attempt to recover Radio Link between backup frequency in list；Enable the terminals to be quickly switched into target frequency, frequency spectrum switching is completed together with base station, recovers business, the continuity of business is kept.
Further, for CR wireless communication systems, when detecting primary user and occurring, in the case that terminal can not carry out proper communication with base station, replace between the backup frequency of terminal successively in backup frequency list and current frequency and attempt recovery Radio Link, enable the terminals to be quickly switched into target frequency, frequency spectrum switching is completed together with base station, recovers business, the continuity of business is kept.
In cognition radio communication system, the general user terminal UE with two kinds of functions ,-kind it is the user terminal with perceptional function, a kind of is the user terminal without perceptional function.For the user terminal with perceptional function, it can be detected on its used frequency spectrum always, if having primary user's appearance.Generally, the appearance that user terminal perceives primary user is all to carry out in the cycle, is done in a cycle and once determines whether that primary user occurs.And for the terminal without perceptional function, it can not judge whether there is primary user's appearance on the frequency spectrum used at it.
For the ease of the understanding of those skilled in the art, illustrated below with specific application example.
Embodiment 1
In this embodiment there is provided a kind of wireless link recovery method, this method is exactly the lower blind handover processing method being all suitable in connected state user terminal UE of all base station services.Do not consider whether UE has perceptional function in the present embodiment, after UE judges that Radio Link goes wrong, trial is jumped to be communicated on other standby frequencies with base station, i.e. exemplified by replacing between current frequency and the backup frequency in backup frequency list and attempt to recover Radio Link, so as to attempt to recover Radio Link, that is, recover business.
For the user terminal in connected state, after user terminal finds radio link problem, start timer T1, within the T1 times, the backup frequency in current frequency F0 and backup frequency list in user terminal cycle（By taking F1 and F2 as an example）Between attempt recovery business, specifically as shown in Fig. 2 Fig. 2 is a kind of flow chart of the wireless link recovery method of the terminal without perceptional function provided in an embodiment of the present invention, as shown in Fig. 2, in this embodiment, F0, F1 and F2 are operating carriers of the UE within the T1 times（Frequency；), Tf01, Tfl, Tf02 and Tf2 are respectively to attempt to recover the time of Radio Link in the frequency：
At the t0 moment, Radio Link starts to go wrong, but in the tl times, UE detected radio link problem, time-consuming to be recorded as T01;
From the tl moment, UE begins attempt to recover business on different carrier waves；Attempt whether Radio Link can be recovered on F0 first；If it could not, attempting to recover on a backup frequency F1 in backup list；Continue to recover to attempt to recover Radio Link if it could not, UE returns to F0；If can't recover,
Another backup frequency F2s of the UE in backup list is (it is of course also possible to again attempt to an above-mentioned frequency）Upper recovery business.The like, until in the period in T1 to T2, recovering Radio Link；Certainly, in this embodiment, simply exemplified by carrying out replacing trial recovery Radio Link using current frequency and a backup frequency, but this is not limited to, current frequency and multiple frequencies can also be used（Attempt successively) carry out alternately attempting to recover Radio Link, its implementation process is similar with the process that current frequency and a backup frequency carry out alternately attempting to recover Radio Link, will not be repeated here.
In this embodiment, if UE is in T1 (i.e. t0 to the period between t2）Time（Wait the wireless link recovery time）It is interior, it can not also replace recovery Radio Link with backup frequency in current frequency, then UE is returned on current frequency F0 and continued with.Handling process afterwards observe corresponding wireless communication protocol specification, such as 3GPP, into Radio Link Failure handling process, the failure handling flow to those skilled in the art be know technology, will not be repeated here.
Wherein, in this embodiment, for time relationship, set according to the following rules：
T01 :UE detects the time that Radio Link goes wrong.Can be according to the difference of the detection method of different system, this time can be different, the present embodiment no longer --- explanation.
TfOl:It is relevant with system frequency language detection cycle Tsens.Generally, it is desirable to arrived in system detectio
PU user occurs, and base station is switched to after new backup frequency, and terminal can just be switched to backup frequency at once and go to attempt recovery business.It is therefore proposed that TfOl=Tsens _ T01.
Tfl :The time of business recovery is attempted in backup frequency fl for UE.It is different according to the method that different system and different confirmations recover.By taking 3GPP as an example, it is believed that physical layer reports in-sync, wireless link recovery is considered as.
Tf02:It is that UE attempts to recover after failure on backup frequency fl, the time returned to needed for f0 continuation recovers.It is different according to the method that different system and different confirmations recover.
In embodiments of the present invention, Tf2 and Tfl definition is consistent, also consistent with Tf02 definition.
T1 time：The time should be not more than system when handling common radio link problem, wait the time of wireless link recovery.For example, for LTE system, after bottom reports out-of-sync, the time of the Wait-to-Restore (in-sync) of acquiescence is ls.If when the time is overtime, Radio Link does not recover, then system thinks Radio Link Failure.
In the embodiment of the present invention, for CR wireless communication systems, when detecting Radio Link and going wrong, i.e., in the case that terminal can not carry out proper communication with base station, the terminal replace between current frequency and the backup frequency in backup frequency list successively attempts recovery Radio Link；Enable the terminals to be quickly switched into target frequency
Point, frequency spectrum switching is completed together with base station, recovers business, the continuity of business is kept.
Embodiment 2
For the terminal with perception, if it can perceive out the appearance of primary user rapidly, so it can just start blind handover process rapidly, the time of service disconnection is reduced as far as possible, that is, the present embodiment is also exemplified by replacing between current frequency and the backup frequency in backup frequency list and attempt to recover Radio Link.
Referring to Fig. 3, being a kind of flow chart of the wireless link recovery method of the terminal with perceptional function provided in an embodiment of the present invention, the embodiment is the optimization in embodiment 1：In this embodiment, F0, F1 and F2 are operating carriers of the UE within the T1 times（Frequency), TfOl, Tfl, Tf02 and Tf2 are respectively to attempt to recover the time of Radio Link in the frequency：
At the t0 moment, PU user occurs, in the tl times, and UE detects PU user's appearance, time-consuming to be recorded as T02;
From the tl moment, UE begins attempt to recover business on different carrier waves；On a backup frequency F1 first in backup frequency list attempt whether Radio Link can be recovered；Continue to recover if it could not, UE returns to F0；If continuing still recover in F0, UE is in another backup frequency F2 in backup frequency list (it is of course also possible to again attempt to an above-mentioned frequency）It is upper to attempt to recover, if can not still recover, return to F0 and continue to recover, the like；Until recovering Radio Link waiting in the wireless link recovery time；
Wherein, in this embodiment, simply exemplified by carrying out replacing trial recovery Radio Link using current frequency and a backup frequency, but this is not limited to, current frequency and multiple frequencies can also be used（Multiple frequencies are attempted successively) carry out alternately attempting to recover Radio Link, its implementation process is similar with the process that current frequency and a backup frequency carry out alternately attempting to recover Radio Link, will not be repeated here.
Certainly, if UE is in T1 (i.e. t0 to the period between t2）Time（Wait the wireless link recovery time）It is interior, also it can not recover business on current frequency or backup frequency, then UE is returned on current frequency F0 and continued with.Handling process afterwards observes corresponding wireless communication protocol specification, such as 3GPP.
In this embodiment, time relationship is set to set according to the following rules：
T02:Occur for PU user, the time of PU user's appearance is detected to UE；Ordinary circumstance can be detected that PU user's cycle and detection algorithm are influenceed by UE.
Tfl is the time that UE attempts business recovery in backup frequency fl.According to different system with Bu Tong really
The method for recognizing recovery is different.
TfOl is that UE attempts to recover after failure on backup frequency fl, the time returned to needed for f0 continuation recovers.It is different according to the method that different system and different confirmations recover.
Tf2 is the time that UE attempts business recovery in backup frequency f2.It is different according to the method that different system and different confirmations recover.
Tf02 is that UE attempts to recover after failure on backup frequency f2, the time returned to needed for f0 continuation recovers.It is different according to the method that different system and different confirmations recover.
In order to optimize the present embodiment, in above-described embodiment 1 and embodiment 2,
If T01<T02, that is, terminal first detect radio link problem, then terminal just carries out the trial of frequency spectrum switching according to embodiment 1.
If T01>T02, that is, terminal first detect that PU user occurs, then terminal just carries out the trial of frequency spectrum switching according to embodiment 2.
Generally, if primary user occurs, and terminal can also be properly received the data of base station, then terminal should not start the flow of blind handover.
If terminal judges that primary user occurs, and terminal is less than the thresholding (Qout in such as LTE) of some setting in multiple subframe reception failures before or received signal quality, it so just can consider that Radio Link goes wrong, and start blind handover process.
In the embodiment of the present invention, for CR networks, when primary user occurs, in the case that terminal can not carry out proper communication with base station, replace trial between the backup frequency of terminal successively in backup frequency list and current frequency and recover Radio Link, enable the terminals to be quickly switched into target frequency, frequency spectrum switching is completed together with base station, recovery business, keeps the continuity of business.
Implementation process based on the above method, the embodiment of the present invention also provides a kind of wireless link recovery device, and its structural representation refers to Fig. 4, and described device includes：The link-recovery unit 42 of detection unit 41 and first.Wherein, the detection unit 41, is detected for terminal-pair Radio Link；The first link-recovery unit 42, for when detection unit 41 detects Radio Link and gone wrong, waiting in the wireless link recovery time, alternately attempts to recover Radio Link between the first frequency set in advance.First frequency set in advance includes：Current frequency and the backup frequency in backup frequency list；Or multiple backup frequencies in backup frequency list.
It is preferred that, described device can also include：Receiving unit and memory cell, wherein, the receiving unit, for before detection unit is detected to Radio Link, receiving the backup for the different carrier waves that base station is sent
Frequency list；The memory cell, for storing the backup frequency list that receiving unit is received.Wherein, the first link-recovery unit includes：First alternate link recovery unit and/or the first backup link recovery unit, wherein, the first alternate link recovery unit, for when detecting Radio Link and going wrong, waiting in the wireless link recovery time, replacing trial between current frequency and the backup frequency in backup frequency list successively and recover Radio Link；The first backup link recovery unit, for when detecting Radio Link and going wrong, waiting in the wireless link recovery time, alternately attempts recovery Radio Link successively between multiple backup frequencies in backup frequency list.
Wherein, the first alternate link recovery unit includes：First attempts unit and the first backup trial unit, can further include recovery failure handling unit, wherein,
Described first attempts unit, for when detection unit detects Radio Link and gone wrong, attempting Radio Link whether can be recovered in current frequency, and the result that can not recover Radio Link being sent into the first backup to attempt unit；And when can not recover the result of Radio Link of unit transmission is attempted receiving the first backup, continue attempt whether Radio Link can be recovered in current frequency；And the result that can not recover Radio Link is sent to dynamic first backup trial unit；
Unit is attempted in first backup, attempts Radio Link whether can be recovered at least one backup frequency in backup frequency list, and the result that can not recover Radio Link is fed back into described first to attempt unit；And when can not recover the result of Radio Link of the first trial unit transmission is being received, continue at least one backup frequency in backup frequency list attempts whether Radio Link can be recovered；And the result that can not recover Radio Link is sent to the first trial unit；Until recovering Radio Link waiting in the wireless link recovery time.
Described first recovers failure handling unit, for waiting in the wireless link recovery time, it can not all recover Radio Link on all backup frequencies in current frequency and backup frequency list, then return to current frequency, and enter Radio Link Failure handling process.
It is preferred that, the first backup link recovery unit specifically for, when detection unit detects Radio Link and gone wrong, waiting in the wireless link recovery time, if current frequency attempts that Radio Link can not be recovered, then a backup frequency in backup frequency list attempts whether Radio Link can be recovered, if can not, then another backup frequency in backup frequency list attempts whether Radio Link can be recovered, if Radio Link can't be recovered in another backup frequency, then return and perform a step of backup frequency in backup frequency list attempts whether Radio Link can be recovered；Until recovering Radio Link waiting in the wireless link recovery time.
It is preferred that, in the above-described embodiments, described device can also include：Second link-recovery unit, for when detection unit detects on Radio Link and has primary user's signal to occur, waiting in the wireless link recovery time, alternately attempts to recover Radio Link between the second frequency set in advance.
Wherein, the described second frequency set in advance includes：Backup frequency and current frequency in backup frequency list；Or multiple backup frequencies in backup frequency list；But it is not limited to this.
It is preferred that, the second link-recovery unit at least includes following one kind：Second alternate link recovery unit, and/or the second backup link recovery unit, wherein, second alternate link recovery unit, during for there is primary user's signal to occur on Radio Link is detected, waiting in the wireless link recovery time, replacing trial between the backup frequency in backup frequency list and current frequency successively and recover Radio Link；Second backup link recovery unit, during for there is primary user's signal to occur on Radio Link is detected, is being waited in the wireless link recovery time, alternately attempts to recover Radio Link successively between multiple backup frequencies in backup frequency list.
Wherein, the second alternate link recovery unit includes：Second attempts unit and the second backup trial unit, can also further include second and recover failure handling unit, wherein,
Described second attempts unit, for when detection unit detects on Radio Link and has primary user's signal to occur, the instruction that unit sends recovery Radio Link to be attempted to the second backup；And when can not recover the result of Radio Link of unit transmission is attempted receiving second backup, continue to attempt Radio Link whether can be recovered in current frequency, and the result that can not recover Radio Link be sent to dynamic second backup to attempt unit；Unit is attempted in second backup, for when receiving the instruction of recovery Radio Link of the second trial unit transmission, at least one backup frequency in backup frequency list attempts whether Radio Link can be recovered, and the result that can not recover Radio Link is sent to the second trial unit, and receiving when can not recover the result of Radio Link of the second trial unit transmission, continue at least one backup frequency in backup frequency list attempts whether Radio Link can be recovered, and the result that can not recover Radio Link is sent to the second trial unit；Until recovering Radio Link waiting in the wireless link recovery time；
Described second recovers failure handling unit, for waiting in the wireless link recovery time, it can not all recover Radio Link on all backup frequencies in current frequency and backup frequency list, then return to current frequency, and enter Radio Link Failure handling process.
It is preferred that, in above-mentioned all embodiments, described device can also include：Timing unit and judging unit, wherein, the timing unit, for when terminal-pair Radio Link is detected, it to be T01 that from Radio Link problem, which occurs, for record to the time spent when Radio Link goes wrong is detected;And record from nothing
It is T02 that problem, which occurs, for wired link to the time spent when primary user's signal occurs is detected;The judging unit, for judging whether the T01 is more than T02, if it is greater, then the judged result that will be greater than is sent to the first link-recovery unit；Otherwise, by less than judged result be sent to the second link-recovery unit；
The first link-recovery unit, it is additionally operable to when receiving the judged result being more than of the first link-recovery unit transmission, waiting in the wireless link recovery time, replacing trial between current frequency and the backup frequency in backup frequency list successively and recover Radio Link；
The second link-recovery unit, it is additionally operable to when receiving the judged result being less than of the first link-recovery unit transmission, waiting in the wireless link recovery time, replacing trial between the backup frequency in backup frequency list and current frequency successively and recover Radio Link.
The function of unit and the implementation process of effect refer to corresponding implementation process in the above method in described device, will not be repeated here.
The present invention is solved in cognitive radio networks, when primary user suddenly appears in the frequency range that time user is using, if the interference that primary user is formed to secondary user is very big, cause the system of time user can not proper communication, now secondary user recovers Radio Link using trial is replaced between current frequency and backup frequency, it will continue to communicate on link switching to new idle frequency spectrum, to avoid causing the business of secondary custom system interrupting.For CR networks, gone wrong or when primary user occurs detecting Radio Link, in the case that terminal can not carry out proper communication with base station, enable the terminals to be quickly switched into target frequency, frequency spectrum switching is completed together with base station, recovers business, the continuity of business is kept.
In the present embodiment, the fast quick-recovery Radio Link when Radio Link is interrupted, and recover the method for Radio Link in this case, referred to as blind switching method.
It should be noted that, herein, such as first and second or the like relational terms are used merely to make a distinction an entity or operation with another entity or operation, and not necessarily require or imply between these entities or operation there is any this actual relation or order.And, term " including ", " including " or any other variant thereof is intended to cover non-exclusive inclusion, so that process, method, article or equipment including a series of key elements not only include those key elements, but also other key elements including being not expressly set out, or also include for this process, method, article or the intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence " including one ... ", it is not excluded that also there is other identical element in the process including the key element, method, article or equipment.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention
The mode of required general hardware platform can be added to realize by software, naturally it is also possible to by hardware, but the former is more preferably embodiment in many cases.Understood based on such, the part that technical scheme substantially contributes to prior art in other words can be embodied in the form of software product, the computer software product can be stored in storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions are to cause a computer equipment（Can be personal computer, server, or network equipment etc.）Perform the method described in some parts of each embodiment of the invention or embodiment.
Described above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention..
Claims (18)
- Claim1st, a kind of wireless link recovery method, it is characterised in that including：Terminal-pair Radio Link is detected；When detecting Radio Link and going wrong, waiting in the wireless link recovery time, the terminal is alternately attempted to recover Radio Link between the first frequency set in advance.2nd, the method as described in claim 1, it is characterised in that before terminal-pair Radio Link is detected, methods described also includes：The terminal receives the backup frequency list for the different carrier waves that base station is sent, and stores the backup frequency list, wherein the default frequency is in the backup frequency list.3rd, method as claimed in claim 1 or 2, it is characterised in that first frequency set in advance includes：Current frequency and the backup frequency in backup frequency list；Or multiple backup frequencies in backup frequency list；Described to be waited when detecting Radio Link and going wrong in the wireless link recovery time, the terminal is alternately attempted to recover Radio Link to include between the first frequency set in advance：When detecting Radio Link and going wrong, waiting in the wireless link recovery time, the terminal replace between current frequency and the backup frequency in backup frequency list successively attempts recovery Radio Link；Or when detecting Radio Link and going wrong, waiting in the wireless link recovery time, recovery Radio Link is alternately attempted between the multiple backup frequencies of the terminal successively in backup frequency list.4th, method as claimed in claim 3, it is characterised in that the terminal replaces trial between current frequency and the backup frequency in backup frequency list successively, which recovers Radio Link, includes：The terminal attempts whether Radio Link can be recovered in current frequency, if can not, then at least one backup frequency in backup frequency list attempts whether Radio Link can be recovered, if can not, then return to current frequency attempts whether Radio Link can be recovered, if Radio Link can't be recovered in current frequency, return and perform the step of described at least one backup frequency in backup frequency list attempts whether Radio Link can be recovered；Until recovering Radio Link waiting in the wireless link recovery time.5th, the method as described in any one of Claims 1-4, it is characterised in that also include：When detect on Radio Link there is primary user's signal to occur when, the terminal between the second frequency set in advance alternately attempt recover Radio Link.6th, method as claimed in claim 5, it is characterised in that second frequency set in advance includes：Backup frequency and current frequency in backup frequency list；Or multiple backup frequencies in backup frequency list； It is described when detect on Radio Link there is primary user's signal to occur when, the terminal between the described second frequency set in advance alternately attempt recover Radio Link include：When detect on Radio Link there is primary user's signal to occur when, wait the wireless link recovery time in, replace between the backup frequency of the terminal successively in backup frequency list and current frequency attempt recovery Radio Link；OrWhen detect on Radio Link there is primary user's signal to occur when, wait the wireless link recovery time in, between the multiple backup frequencies of the terminal successively in backup frequency list alternately attempt recovery Radio Link.7th, method as claimed in claim 6, it is characterised in that replacing trial recovery Radio Link between the backup frequency of the terminal successively in backup frequency list and current frequency includes：At least one the backup frequency of the terminal in backup frequency list attempts whether Radio Link can be recovered, if can not, then return to current frequency attempts whether Radio Link can be recovered, if Radio Link can not be recovered in current frequency, return and perform described at least one backup frequency in backup frequency list attempts whether Radio Link can be recovered；Until recovering Radio Link waiting in the wireless link recovery time.8th, the method as described in any one of claim 1 to 7, it is characterised in that also include：When terminal-pair Radio Link is detected, it is TO 1 that from Radio Link problem, which occurs, for record to the time spent when Radio Link goes wrong is detected；And it is T02 to record from Radio Link generation problem to the time spent when primary user's signal occurs is detected;When T01 is more than T02, performs the terminal and replace the step of trial recovers Radio Link between current frequency and the backup frequency in backup frequency list successively；When T01 is less than T02, performs replace between terminal backup frequency successively in backup frequency list and current frequency and attempt recovery Radio Link.9th, the method as described in claim 3 or 6, it is characterised in that recovery Radio Link is alternately attempted between the multiple backup frequencies of the terminal successively in backup frequency list and is specifically included：The terminal attempts whether Radio Link can be recovered in current frequency, if can not, then a backup frequency in backup frequency list attempts whether Radio Link can be recovered, if can not, then another backup frequency in backup frequency list attempts whether Radio Link can be recovered, if Radio Link can't be recovered in another backup frequency, return and perform a step of backup frequency in backup frequency list attempts whether Radio Link can be recovered；Until recovering Radio Link waiting in the wireless link recovery time.10th, a kind of wireless link recovery device, it is characterised in that including：Detection unit, for being detected to Radio Link； First link-recovery unit, for when detection unit detects Radio Link and gone wrong, waiting in the wireless link recovery time, alternately attempts to recover Radio Link between the first frequency set in advance.11st, device as claimed in claim 10, it is characterised in that also include：Receiving unit, for before detection unit is detected to Radio Link, receiving the backup frequency list for the different carrier waves that base station is sent；Memory cell, for storing the backup frequency list that receiving unit is received.12nd, the device as described in claim 10 or 11, it is characterised in that the first link-recovery unit at least includes following one kind：First alternate link recovery unit, for when detecting Radio Link and going wrong, waiting in the wireless link recovery time, replace between current frequency and the backup frequency in backup frequency list attempt recovery Radio Link successively；First backup link recovery unit, for when detecting Radio Link and going wrong, waiting in the wireless link recovery time, alternately attempts recovery Radio Link successively between multiple backup frequencies in backup frequency list.13rd, device as claimed in claim 12, it is characterised in that the first alternate link recovery unit includes：First attempts unit and the first backup trial unit, wherein,Described first attempts unit, for when detection unit detects Radio Link and gone wrong, attempting Radio Link whether can be recovered in current frequency, and the result that can not recover Radio Link being sent into the first backup to attempt unit；And when can not recover the result of Radio Link of unit transmission is attempted receiving the first backup, continue attempt whether Radio Link can be recovered in current frequency；And the result that can not recover Radio Link is sent to dynamic first backup trial unit；Unit is attempted in first backup, attempts Radio Link whether can be recovered at least one backup frequency in backup frequency list, and the result that can not recover Radio Link is fed back into described first to attempt unit；And when can not recover the result of Radio Link of the first trial unit transmission is being received, continue at least one backup frequency in backup frequency list attempts whether Radio Link can be recovered；And the result that can not recover Radio Link is sent to the first trial unit；Until recovering Radio Link waiting in the wireless link recovery time.14th, device as claimed in claim 12, it is characterized in that, the first backup link recovery unit specifically for, when detection unit detects Radio Link and gone wrong, waiting in the wireless link recovery time, if current frequency attempts that Radio Link can not be recovered, a backup in backup frequency list Frequency attempts whether Radio Link can be recovered, if can not, then another backup frequency in backup frequency list attempts whether Radio Link can be recovered, if Radio Link can't be recovered in another backup frequency, return and perform a step of backup frequency in backup frequency list attempts whether Radio Link can be recovered；Until recovering Radio Link waiting in the wireless link recovery time.15th, the device as described in any one of claim 10 to 14, it is characterised in that also include：Second link-recovery unit, for when detection unit detects on Radio Link and has primary user's signal to occur, waiting in the wireless link recovery time, alternately attempts to recover Radio Link between the second frequency set in advance.16th, device as claimed in claim 15, it is characterised in that the second link-recovery unit at least includes following one kind：Second alternate link recovery unit, during for there is primary user's signal to occur on Radio Link is detected, waiting in the wireless link recovery time, replacing trial between the backup frequency in backup frequency list and current frequency successively and recovering Radio Link；Second backup link recovery unit, during for there is primary user's signal to occur on Radio Link is detected, is being waited in the wireless link recovery time, alternately attempts to recover Radio Link successively between multiple backup frequencies in backup frequency list.17th, device as claimed in claim 16, it is characterised in that the second alternate link recovery unit includes：Second attempts unit and the second backup trial unit, wherein,Described second attempts unit, for when detection unit detects on Radio Link and has primary user's signal to occur, the instruction that unit sends recovery Radio Link to be attempted to the second backup；And when can not recover the result of Radio Link of unit transmission is attempted receiving second backup, continue to attempt Radio Link whether can be recovered in current frequency, and the result that can not recover Radio Link be sent to dynamic second backup to attempt unit；Unit is attempted in second backup, for when receiving the instruction of recovery Radio Link of the second trial unit transmission, at least one backup frequency in backup frequency list attempts whether Radio Link can be recovered, and the result that can not recover Radio Link is sent to the second trial unit, and receiving when can not recover the result of Radio Link of the second trial unit transmission, continue at least one backup frequency in backup frequency list attempts whether Radio Link can be recovered, and the result that can not recover Radio Link is sent to the second trial unit；Until recovering Radio Link waiting in the wireless link recovery time.18th, the device as described in any one of claim 10 to 17, it is characterised in that also include：Timing unit, for when terminal-pair Radio Link is detected, from Radio Link problem to occur for record It is T01 to the time spent when Radio Link goes wrong is detected;And it is T02 to record from Radio Link generation problem to the time spent when primary user's signal occurs is detected;Judging unit, for judging whether the T01 is more than T02, if it is greater, then the judged result that will be greater than is sent to the first link-recovery unit；Otherwise, by less than judged result be sent to the second link-recovery unit；The first link-recovery unit, it is additionally operable to when receiving the judged result being more than that the judging unit is sent, waiting in the wireless link recovery time, replacing trial between current frequency and the backup frequency in backup frequency list successively and recover Radio Link；Second link-recovery unit, is additionally operable to, when receiving the judged result being less than that the judging unit is sent, waiting in the wireless link recovery time, replaces trial between the backup frequency in backup frequency list and current frequency successively and recover Radio Link.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2011/076405 WO2012159297A1 (en) | 2011-06-27 | 2011-06-27 | Method and device for wireless link recovery |
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| Publication Number | Publication Date |
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| CN103053188A true CN103053188A (en) | 2013-04-17 |
| CN103053188B CN103053188B (en) | 2016-08-03 |
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| CN201180000934.XA Active CN103053188B (en) | 2011-06-27 | 2011-06-27 | A kind of wireless link recovery method and device |
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| WO (1) | WO2012159297A1 (en) |
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| US5517677A (en) * | 1993-05-13 | 1996-05-14 | Uniden America Corporation | Adaptive weighting of a scanning sequence |
| CN1343428A (en) * | 1999-03-05 | 2002-04-03 | 摩托罗拉公司 | Method for recovering communication service |
| CN101325461A (en) * | 2008-07-25 | 2008-12-17 | 浙江大学 | Method for establishing and maintaining cognition radio communication link based on non-speed code |
| CN101702635A (en) * | 2009-10-28 | 2010-05-05 | 北京邮电大学 | Method for switching frequency spectrum based on cognitive radio technology and system thereof |
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2011
- 2011-06-27 CN CN201180000934.XA patent/CN103053188B/en active Active
- 2011-06-27 WO PCT/CN2011/076405 patent/WO2012159297A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5517677A (en) * | 1993-05-13 | 1996-05-14 | Uniden America Corporation | Adaptive weighting of a scanning sequence |
| CN1343428A (en) * | 1999-03-05 | 2002-04-03 | 摩托罗拉公司 | Method for recovering communication service |
| CN101325461A (en) * | 2008-07-25 | 2008-12-17 | 浙江大学 | Method for establishing and maintaining cognition radio communication link based on non-speed code |
| CN101702635A (en) * | 2009-10-28 | 2010-05-05 | 北京邮电大学 | Method for switching frequency spectrum based on cognitive radio technology and system thereof |
Also Published As
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|---|---|
| CN103053188B (en) | 2016-08-03 |
| WO2012159297A1 (en) | 2012-11-29 |
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