CN103053188B - A kind of wireless link recovery method and device - Google Patents
A kind of wireless link recovery method and device Download PDFInfo
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- CN103053188B CN103053188B CN201180000934.XA CN201180000934A CN103053188B CN 103053188 B CN103053188 B CN 103053188B CN 201180000934 A CN201180000934 A CN 201180000934A CN 103053188 B CN103053188 B CN 103053188B
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Abstract
A kind of wireless link recovery method and device, described method includes: wireless link is detected by terminal；When detecting that wireless link goes wrong, in waiting the wireless link recovery time, described terminal alternately attempts recovering wireless link between the first frequency set in advance.In the embodiment of the present invention, for CR wireless communication system, when detecting that wireless link goes wrong, in the case of i.e. terminal cannot carry out proper communication with base station, this terminal alternately attempts recovering wireless link between the first frequency set in advance；Enable the terminals to be quickly switched into target frequency, complete frequency spectrum switching together with base station, recover business, keep the seriality of business.
Description
Technical field
The present invention relates to communication technical field, particularly to a kind of wireless link recovery method and device.
Background technology
Cognitive radio (CR, CognitiveRadio) is to solve the most promising technology that current frequency spectrum resource is nervous.Research shows, the most in the frequency spectrum of fixed allocation, has and is underutilized in a large number, which results in the significant wastage of frequency spectrum resource.Cognitive radio passes through cognitive radio spectrum environment, it appeared that these vacant frequency ranges, and these frequency ranges of dynamic access on the premise of not disturbing primary user (PU, PrimaryUser), thus improve the availability of frequency spectrum.Dynamically utilized the user of frequency spectrum resource by cognitive radio system, be referred to as time user (SU, SecondUser).
Frequency spectrum perception is the key technology of cognitive radio.The purpose of frequency spectrum perception is to monitor and the active situation of primary user's signal in detection special frequency channel, and when detecting that idle frequency spectrum exists when (being not detected by primary user's signal), cognitive radio system can use this frequency spectrum；And when detecting that primary user's signal occurs again, cognitive radio system must exit this frequency range within the time of regulation.But in order to ensure the seriality of business in cognitive radio system, after system exits certain frequency range, it is necessary to be immediately switched on new available frequency band work on.
Generally, handoff procedure is: after base station or network side decision-making to switch, and sends switching command and performs switching to terminal, terminal according to the requirement of order.But in cognitive radio system, when primary user occurs, and the signal of primary user strong especially time, the base station of cognitive radio system and the severe exacerbation that communicates of terminal may be caused, it is impossible to communicate again, thus directly result in service disconnection, therefore, need currently exist for a kind for the treatment of mechanism and solve problem in this case, during to ensure that strong primary user's signal occurs to greatest extent, the communication recovery of cognitive radio communication systems, it is to avoid service disconnection.
Summary of the invention
The embodiment of the present invention provides the method and device of a kind of wireless link recovery, to solve to recover the technical problem of wireless link when wireless link interrupts.
To this end, the embodiment of the present invention provides a kind of wireless link recovery method, described method includes:
Wireless link is detected by terminal；
When detecting that wireless link goes wrong, in waiting the wireless link recovery time, described terminal alternately attempts recovering wireless link between the first frequency set in advance.
Accordingly, the embodiment of the present invention also provides for a kind of wireless link recovery device, and described device includes:
Detector unit, for detecting wireless link；
First link-recovery unit, for when detector unit detects that wireless link goes wrong, in waiting the wireless link recovery time, alternately attempts recovering wireless link between the first frequency set in advance.
In the embodiment of the present invention, for CR wireless communication system, when detecting that wireless link goes wrong, in the case of i.e. terminal cannot carry out proper communication with base station, alternately attempt recovering wireless link between this terminal backup frequency in current frequency and backup frequency list successively；Enable the terminals to be quickly switched into target frequency, complete frequency spectrum switching together with base station, recover business, it is ensured that the seriality of business.
Accompanying drawing explanation
Fig. 1 provides the flow chart of a kind of wireless link recovery method for the embodiment of the present invention；
The flow chart of the wireless link recovery method of a kind of terminal without perceptive function that Fig. 2 provides for the embodiment of the present invention；
The flow chart of the wireless link recovery method of a kind of terminal with perceptive function that Fig. 3 provides for the embodiment of the present invention；
Fig. 4 is the structural representation of the embodiment of the present invention a kind of wireless link recovery device.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that the scheme of the embodiment of the present invention, with embodiment, the embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
Referring to Fig. 1, for the flow chart of a kind of wireless link recovery method that the embodiment of the present invention provides, be applied in cognitive radio (CR, CognitiveRadio) wireless communication system, described method includes:
Step 101: wireless link is detected by terminal；
Step 102: when detecting that wireless link goes wrong, in waiting the wireless link recovery time, described terminal alternately attempts recovering wireless link between the first frequency set in advance.
In the embodiment of the present invention, when terminal detects that wireless link goes wrong, in waiting the wireless link recovery time, alternately attempt successively recovering wireless link between the first frequency set in advance, solve terminal in the case of cannot carrying out proper communication with base station, enable the terminals to be quickly switched into target frequency, recover wireless link, thus complete frequency spectrum switching together with base station, recover business, keep the seriality of business.
Preferably, described first frequency set in advance may include that current frequency and the backup frequency in backup frequency list；Or the multiple backup frequencies in backup frequency list；But it is not limited to this.
In step 102, described when detecting that wireless link goes wrong, in waiting the wireless link recovery time, described terminal is alternately attempted recovering wireless link between the first frequency set in advance and is included:
When detecting that wireless link goes wrong, in waiting the wireless link recovery time, alternately attempt recovering wireless link between the described terminal backup frequency in current frequency and backup frequency list successively；Or
When detecting that wireless link goes wrong, in waiting the wireless link recovery time, alternately attempt recovering wireless link between the described terminal multiple backup frequencies in backup frequency list successively.
Wherein, alternately attempt recovering wireless link between the described terminal multiple backup frequencies in backup frequency list successively to specifically include: described terminal attempts whether recovering wireless link at current frequency, if can not, then a backup frequency in backup frequency list attempts whether recovering wireless link, if can not, then another backup frequency in backup frequency list attempts whether recovering wireless link, if wireless link can't be recovered at another backup frequency, the backup frequency then returned described in performing in backup frequency list attempts whether recovering the step of wireless link；Until recovering wireless link in waiting the wireless link recovery time.
Alternately attempt recovering wireless link between the described terminal backup frequency in current frequency and backup frequency list successively to specifically include: described terminal attempts whether recovering wireless link at current frequency, if can not, then at least one the backup frequency in backup frequency list attempts whether recovering wireless link, if can not, then return current frequency attempts whether recovering wireless link, if wireless link can't be recovered at current frequency, at least one the backup frequency then returned described in performing in backup frequency list attempts whether recovering the step of wireless link；Until recovering wireless link in waiting the wireless link recovery time；
That is, in this step, a kind of situation is: if attempting recovering Radio Link Failure at current frequency, first backup frequency in backup frequency list can be used to attempt recovering wireless link, if recovering Radio Link Failure at first backup frequency, then return current frequency to continue to attempt to recover wireless link, if still failed, then use second backup frequency in backup frequency list to attempt recovering wireless link；If recovering Radio Link Failure at second backup frequency, then return current frequency and continue to attempt to recover wireless link, if also failure, then use the 3rd backup frequency in backup frequency list to attempt recovering wireless link；If recovering Radio Link Failure at the 3rd backup frequency, then return current frequency and continue to attempt to recover wireless link, the like, until recovering wireless link or reaching presetting wait wireless link recovery time.It should be noted that attempt, at current frequency and all backup frequencies, the time recovering wireless link to wait the wireless link recovery time less than or equal to presetting.
Another kind of situation is: if attempting recovering Radio Link Failure at current frequency, first backup frequency in backup frequency list can be first used to attempt recovering wireless link, if recovering Radio Link Failure at first backup frequency, then second backup frequency in backup frequency list is used to attempt recovering wireless link；If recovering Radio Link Failure at second backup frequency, then return current frequency to continue to attempt to recover wireless link, if it is the most failed, the 3rd backup frequency in backup frequency list is then used to attempt recovering wireless link, if failure, the 4th backup frequency in backup frequency list is then used to attempt recovering wireless link, if the most failed；Then return current frequency to continue to attempt to recover wireless link, if also failure, then use the 5th backup frequency in backup frequency list to attempt recovering wireless link；If recovering Radio Link Failure at the 5th backup frequency, then the 6th backup frequency in backup frequency list is used to attempt recovering wireless link；If recovering Radio Link Failure at the 6th backup frequency, then return current frequency and continue to attempt to recover wireless link, the like, until recovering wireless link or reaching presetting wait wireless link recovery time.It should be noted that attempt, at current frequency and all backup frequencies, the time recovering wireless link to wait the wireless link recovery time less than or equal to presetting.
On the basis of above-described embodiment, it is also possible to using the backup frequency of three or more than three that back up frequency list to carry out attempting recovering wireless link successively, it is similar to the above that it realizes process, does not repeats them here.
Wherein, in the above-described embodiments, for the backup frequency attempted, it is also possible to again attempt to recover wireless link.
Certainly, in above-mentioned all embodiments, if in waiting the wireless link recovery time, all cannot recover wireless link at current frequency on all backup frequencies in backup frequency list, then return current frequency, and enter Radio Link Failure handling process.This Radio Link Failure handling process is the most also to know technology, does not repeats them here.
Preferably, before wireless link is detected by terminal, described method can also include: described terminal receives the backup frequency list of the different carrier that base station sends, and stores described backup frequency list.
Namely club, in CR wireless communication system, in order to avoid, strong primary user's signal occurs when, system communication is interrupted and cannot recover, CR wireless communication system can with proper communication when can safeguard one backup frequency list, this list between the base station and the terminal be synchronize；Radio link problem (such as strong primary user's signal occurs, or the situation such as big interference or decline) cause system cannot proper communication time, base station can first switch to frequency of certain backup up；And terminal also scheme according to the present invention can attempt to switch to certain backup frequency up, it is intended to again recover with base station to communicate.
Preferably, described can also include: when terminal detects and has primary user's signal to occur on wireless link, described terminal alternately attempts recovering wireless link between the second frequency set in advance；
Preferably, the backup frequency during described second frequency set in advance may include that backup frequency list and current frequency；Or the multiple backup frequencies in backup frequency list；But it is not limited to this；
Described when detect have primary user's signal to occur on wireless link time, described terminal alternately attempts recovering wireless link between described second frequency set in advance and includes:
When detect have primary user's signal to occur on wireless link time, waiting in the wireless link recovery time, the described terminal backup frequency in backup frequency list successively and alternately attempt between current frequency recovering wireless link；Or
When detect have primary user's signal to occur on wireless link time, waiting in the wireless link recovery time, alternately attempt recovering wireless link between the described terminal multiple backup frequencies in backup frequency list successively.
Wherein, alternately attempt recovering wireless link between the described terminal backup frequency in backing up frequency list successively and current frequency to specifically include:
Described terminal at least one backup frequency in backup frequency list attempts whether recovering wireless link, if can not, then return current frequency attempts whether recovering wireless link, if wireless link can not be recovered at current frequency, then return and perform described at least one backup frequency in backup frequency list attempts whether recovering wireless link；Until recovering wireless link in waiting the wireless link recovery time；
That is, in this step, a kind of situation is, when detecting have primary user's signal to occur on wireless link when terminal, the terminal first backup frequency in backup frequency list attempts whether recovering wireless link, if can not, then return current frequency attempts whether recovering wireless link, if can not, then second backup frequency in backup frequency list attempts whether recovering wireless link, if can't, then return current frequency attempts whether recovering wireless link, if can not, then the 3rd backup frequency in backup frequency list attempts whether recovering wireless link, if can't, then return current frequency attempts whether recovering wireless link, the like, until reaching wait the wireless link recovery time or recover wireless link；It should be noted that attempt, at current frequency and all backup frequencies, the time recovering wireless link to wait the wireless link recovery time less than or equal to presetting.
nullAnother kind of situation is，When detecting have primary user's signal to occur on wireless link when terminal，The terminal first backup frequency in backup frequency list attempts whether recovering wireless link，If can not，The terminal second backup frequency in backup frequency list attempts whether recovering wireless link，If can not，Then return current frequency attempts whether recovering wireless link，If can not recover at current frequency，Then the 3rd backup frequency in backup frequency list attempts whether recovering wireless link，If can't，Then the 4th backup frequency in backup frequency list attempts whether recovering wireless link，If still can not，Then return current frequency attempts whether recovering wireless link，If can not recover at current frequency，Then the 5th backup frequency in backup frequency list attempts whether recovering wireless link，If can't，Then the 6th backup frequency in backup frequency list attempts whether recovering wireless link；If wireless link can not be recovered at the 6th backup frequency, then return current frequency attempts whether recovering wireless link, the like, until recovering wireless link or reaching presetting wait wireless link recovery time；It should be noted that attempt, at current frequency and all backup frequencies, the time recovering wireless link to wait the wireless link recovery time less than or equal to presetting.
On the basis of above-described embodiment, it is also possible to using the backup frequency of three or more than three that back up frequency list to carry out attempting recovering wireless link successively, it is similar to the above that it realizes process, does not repeats them here.
Wherein, in the above-described embodiments, for the backup frequency attempted, it is also possible to again attempt to recover the process of wireless link.
Certainly, in above-mentioned all embodiments, if terminal is in waiting the wireless link recovery time, all of backup frequency in backup frequency list all cannot recover wireless link on current frequency, then return current frequency, continue with according to corresponding radio communication Radio Link Failure flow process.This Radio Link Failure handling process is the most also to know technology, does not repeats them here.
Preferably, in the above-described embodiments, described method can also include: when wireless link is detected by terminal, and recording from wireless link generation problem to the time spent when detecting that wireless link goes wrong is T1；And record is T2 from wireless link generation problem to primary user's signal time spent when occurring being detected；
If it is determined that T1 is more than T2, then explanation terminal first detects that wireless link goes wrong, and performs alternately to attempt recovering between described terminal backup frequency successively in current frequency and backup frequency list the step of wireless link；It implements process and refers to above-mentioned, is not repeating at this；
During if it is determined that T1 is less than T2, then explanation terminal first detects that PU user occurs, performs described terminal backup frequency successively in backup frequency list and alternately attempts between current frequency recovering wireless link.It implements process and refers to above-mentioned, is not repeating at this；
Generally, if primary user occurs, and terminal can also be properly received the data of base station, then terminal should not start the flow process of blind handover.If terminal judges primary user occurs, and the thresholding (Qout in such as LTE) that terminal sets less than certain in multiple subframe reception failures before or received signal quality, so just it is believed that wireless 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 system, when detecting that wireless link goes wrong, in the case of i.e. terminal cannot carry out proper communication with base station, alternately attempt recovering wireless link between this terminal backup frequency in current frequency and backup frequency list successively；Enable the terminals to be quickly switched into target frequency, complete frequency spectrum switching together with base station, recover business, keep the seriality of business.
Further, for CR wireless communication system, detecting that primary user occurs when, in the case of terminal cannot carry out proper communication with base station, alternately attempt recovering wireless link between the terminal backup frequency in backup frequency list successively and currently frequency, enable the terminals to be quickly switched into target frequency, complete frequency spectrum switching together with base station, recover business, keep the seriality of business.
In cognition radio communication system, typically there is the user terminal UE of two kinds of functions, a kind of user terminal being to have perceptive function, a kind of user terminal being not have perceptive function.For having the user terminal of perceptive function, it can detect on the frequency spectrum used at it always, if has primary user to occur.Generally, the appearance of user terminal perception primary user is all to carry out in the cycle, does and once determine whether that primary user occurs within a cycle.And for not having the terminal of perceptive function, it can not judge whether have primary user to occur on its frequency spectrum used.
For the ease of the understanding of those skilled in the art, illustrate with concrete application example below.
Embodiment 1
In this embodiment, it is provided that a kind of wireless link recovery method, the method is exactly to be in, under the service of all base stations, the blind handover processing method that connected state user terminal UE is all suitable for.The present embodiment does not consider whether UE has perceptive function, after UE judges that wireless link goes wrong, attempt jumping to communicate with base station on other standby frequency, as a example by i.e. alternately attempting recovering wireless link between the backup frequency in current frequency and backup frequency list, thus attempt to recover wireless link, i.e. recover business.
For being in the user terminal of connected state, after user terminal finds radio link problem, start intervalometer T1, within the T1 time, recovery business is attempted between the backup frequency (as a example by F1 and F2) in current frequency F0 and backup frequency list in user terminal cycle, the most as shown in Figure 2, the flow chart of the wireless link recovery method of a kind of terminal without perceptive function that Fig. 2 provides for the embodiment of the present invention, as shown in Figure 2, in this embodiment, F0, F1 and F2 is UE operating carriers (frequency) within the T1 time, Tf01, Tf1, Tf02 and Tf2 respectively attempts recovering the time of wireless link at this frequency:
In the t0 moment, wireless link starts to go wrong, but in the t1 time, UE detected radio link problem, is time-consumingly recorded as T01；
From the t1 moment, UE begins attempt to recover business on different carrier；First attempt whether to recover wireless link on F0；If it could not, one in backup list is backed up trial recovery on frequency F1；Continue to recover to attempt recovering wireless link if it could not, UE returns F0；If can't recover, UE recovers business in another backup frequency F2 (it is of course also possible to again attempting to an above-mentioned frequency) in backup list.The like, until within the time period of T1 to T2, recovering wireless link；
Certainly, in this embodiment, simply as a example by using current frequency and a backup frequency alternately to attempt recovering wireless link, but it is not limited to this, current frequency can also be used alternately to attempt recovering wireless link with multiple frequencies (attempting successively), the process that it realizes process and current frequency and backup frequency alternately attempts recovering wireless link is similar, does not repeats them here.
In this embodiment, if UE is within the time (i.e. waiting the wireless link recovery time) of T1 (i.e. time period between t0 to t2), also cannot alternately recover wireless link at current frequency on backup frequency, then UE is returned on current frequency F0 continue with.Handling process afterwards observes corresponding wireless communication protocol specification, such as 3GPP, enters Radio Link Failure handling process, and this failure handling flow process has been to know technology the most, does not repeats them here.
Wherein, in this embodiment, for time relationship, set according to the following rules:
T01:UE detects the time that wireless link goes wrong.Can be according to the difference of the detection method of different system, this time can be different, and the present embodiment illustrates the most one by one.
Tf01: relevant with system spectrum detection cycle T sens.Generally, it is desirable to detect that PU user occurs in system, after base station is switched to new backup frequency, terminal just can be switched to back up frequency at once and go to attempt recovery business.It is therefore proposed that Tf01=Tsens-T01.
Tf1: attempt the time of business recovery for UE at backup frequency f1.Different according to different system and the different methods confirming to recover.As a example by 3GPP, it is believed that physical layer reports in-sync, it is considered as wireless link recovery.
Tf02: be, after UE attempts recovering unsuccessfully on backup frequency f1, to return to f0 and continue the time needed for recovering.Different according to different system and the different methods confirming to recover.
In embodiments of the present invention, Tf2 with Tf1 definition is consistent, also consistent with Tf02 definition.
The time of T1: this time should be not more than system process common radio link problem time, wait wireless link recovery time.Such as, for LTE system, after bottom reports out-of-sync, the time of the Wait-to-Restore (in-sync) of acquiescence is 1s.If when time time-out, wireless link does not recover, then system thinks Radio Link Failure.
In the embodiment of the present invention, for CR wireless communication system, when detecting that wireless link goes wrong, in the case of i.e. terminal cannot carry out proper communication with base station, alternately attempt recovering wireless link between this terminal backup frequency in current frequency and backup frequency list successively；Enable the terminals to be quickly switched into target frequency, complete frequency spectrum switching together with base station, recover business, keep the seriality of business.
Embodiment 2
For having the terminal of perception, if it perception can go out the appearance of primary user rapidly, so it just can start rapidly blind handover process, reduce the time of service disconnection as far as possible, it is to say, the present embodiment is also as a example by alternately attempting recovering wireless link between current frequency and the backup frequency backed up in frequency list.
Refer to Fig. 3, the flow chart of wireless link recovery method for a kind of terminal with perceptive function that the embodiment of the present invention provides, this embodiment is the optimization in embodiment 1: in this embodiment, F0, F1 and F2 are UE operating carriers (frequency) within the T1 time, and Tf01, Tf1, Tf02 and Tf2 respectively attempt recovering the time of wireless link at this frequency:
In the t0 moment, PU user occurs, in the t1 time, UE detects PU user to be occurred, is time-consumingly recorded as T02；
From the t1 moment, UE begins attempt to recover business on different carrier；First attempt whether to recover wireless link on a backup frequency F1 in backup frequency list；Continue to recover if it could not, UE returns F0；If continuing still can not recover at F0, UE attempts recovering in another backup frequency F2 (it is of course also possible to again attempting to an above-mentioned frequency) in backup frequency list, if still can not recover, then returns F0 and continues to recover, the like；Until recovering wireless link in waiting the wireless link recovery time；
Wherein, in this embodiment, simply as a example by using current frequency and a backup frequency alternately to attempt recovering wireless link, but it is not limited to this, current frequency and multiple frequencies (attempting multiple frequency successively) can also be used alternately to attempt recovering wireless link, the process that it realizes process and current frequency and backup frequency alternately attempts recovering wireless link is similar, does not repeats them here.
Certainly, if UE is within T1 (i.e. time period between t0 to the t2) time (i.e. waiting the wireless link recovery time), also business cannot be recovered on current frequency or backup frequency, then UE is returned on current frequency F0 continue with.Handling process afterwards observes corresponding wireless communication protocol specification, such as 3GPP.
In this embodiment, arrange time relationship to set according to the following rules:
T02: occur for PU user, detect, to UE, the time that PU user occurs；Ordinary circumstance can be affected by UE detection PU user's cycle and detection algorithm.
Tf1 is that UE attempts the time of business recovery at backup frequency f1.Different according to different system and the different methods confirming to recover.
Tf01 is, after UE attempts recovering unsuccessfully on backup frequency f1, to return to f0 and continue the time needed for recovering.Different according to different system and the different methods confirming to recover.
Tf2 is that UE attempts the time of business recovery at backup frequency f2.Different according to different system and the different methods confirming to recover.
Tf02 is, after UE attempts recovering unsuccessfully on backup frequency f2, to return to f0 and continue the time needed for recovering.Different according to different system and the different methods confirming to recover.
In order to optimize the present embodiment, in above-described embodiment 1 and embodiment 2,
If T01 is ＜ T02, namely terminal first detects radio link problem, then terminal just carries out the trial of frequency spectrum switching according to embodiment 1.
If T01 is ＞ T02, namely terminal first detects 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 process of blind handover.
If terminal judges primary user occurs, and the thresholding (Qout in such as LTE) that terminal sets less than certain in multiple subframe reception failures before or received signal quality, then just it is believed that wireless link goes wrong, and start blind handover process.
In the embodiment of the present invention, for CR network, primary user occurs when, in the case of terminal cannot carry out proper communication with base station, alternately attempt recovering wireless link between the terminal backup frequency in backup frequency list successively and currently frequency, enable the terminals to be quickly switched into target frequency, complete frequency spectrum switching together with base station, recovery business, keeps the seriality of business.
The process of realization based on said method, the embodiment of the present invention also provides for a kind of wireless link recovery device, and its structural representation refers to Fig. 4, and described device includes: detector unit 41 and the first link-recovery unit 42.Wherein, described detector unit 41, detects wireless link for terminal；Described first link-recovery unit 42, for when detector unit 41 detects that wireless link goes wrong, in waiting the wireless link recovery time, alternately attempts recovering wireless link between the first frequency set in advance.Described first frequency set in advance includes: current frequency and the backup frequency in backup frequency list；Or the multiple backup frequencies in backup frequency list.
Preferably, described device can also include: receives unit and memory element, wherein, described reception unit, for before wireless link is detected by detector unit, receives the backup frequency list of the different carrier that base station sends；Described memory element, receives, for storing, the described backup frequency list that unit receives.
Wherein, described first link-recovery unit includes: the first alternate link recovery unit and/or the first backup link recovery unit, wherein, described first alternate link recovery unit, for when detecting that wireless link goes wrong, in waiting the wireless link recovery time, alternately attempt recovering wireless link between the backup frequency in current frequency and backup frequency list successively；Described first backup link recovery unit, for when detecting that wireless link goes wrong, in waiting the wireless link recovery time, alternately attempts between the multiple backup frequencies in backup frequency list recovering wireless link successively.
Wherein, described first alternate link recovery unit includes: first attempt unit and first backup attempt unit, it is also possible to farther include recover failure handling unit, wherein,
Described first attempts unit, for when detector unit detects that wireless link goes wrong, attempts whether recovering wireless link at current frequency, and the result that can not recover wireless link is sent to the first backup trial unit；And when receiving the first backup and attempting the result that can not recover wireless link that unit sends, continue current frequency attempts whether recovering wireless link；And the result that can not recover wireless link is sent to dynamic first backup trial unit；
Described first backup trial unit, attempts whether recovering wireless link at least one the backup frequency in backup frequency list, and the result that can not recover wireless link feeds back to described first trial unit；And when receiving the result that can not recover wireless link that the first trial unit sends, at least one the backup frequency continued in backup frequency list attempts whether recovering wireless link；And the result that can not recover wireless link is sent to described first trial unit；Until recovering wireless link in waiting the wireless link recovery time.
Described first recovers failure handling unit, in waiting the wireless link recovery time, all cannot recover wireless link at current frequency, then return current frequency, and enter Radio Link Failure handling process on all of backup frequency in backup frequency list.
Preferably, described first backup link recovery unit specifically for, when detector unit detects that wireless link goes wrong, in waiting the wireless link recovery time, if current frequency is attempted recovering wireless link, then a backup frequency in backup frequency list attempts whether recovering wireless link, if can not, then another backup frequency in backup frequency list attempts whether recovering wireless link, if wireless link can't be recovered at another backup frequency, the backup frequency then returned described in performing in backup frequency list attempts whether recovering the step of wireless link；Until recovering wireless link in waiting the wireless link recovery time.
Preferably, in the above-described embodiments, described device can also include: the second link-recovery unit, for when detector unit detects and has primary user's signal to occur on wireless link, in waiting the wireless link recovery time, alternately attempt recovering wireless link between the second frequency set in advance.
Wherein, described second frequency set in advance includes: the backup frequency in backup frequency list and current frequency；Or the multiple backup frequencies in backup frequency list；But it is not limited to this.
Preferably, described second link-recovery unit at least includes following one: the second alternate link recovery unit, and/or the second backup link recovery unit, wherein, second alternate link recovery unit, for detect have primary user's signal to occur on wireless link time, waiting in the wireless link recovery time, the backup frequency in backup frequency list and alternately attempt between current frequency recovering wireless link successively；Second backup link recovery unit, for detect have primary user's signal to occur on wireless link time, waiting in the wireless link recovery time, alternately attempt between the multiple backup frequencies in backup frequency list successively recovering wireless link.
Wherein, described second alternate link recovery unit includes: second attempts unit and unit is attempted in the second backup, can also include the second recovery failure handling unit further, wherein,
Described second attempts unit, for when detector unit detects and has primary user's signal to occur on wireless link, attempts unit transmission to the second backup and recovers the instruction of wireless link；And when receiving the result that can not recover wireless link that unit transmission is attempted in described second backup, continue to attempt whether recovering wireless link at current frequency, and the result that can not recover wireless link is sent to dynamic second backup trial unit；
Unit is attempted in described second backup, for when receiving the instruction recovering wireless link that the second trial unit sends, at least one backup frequency in backup frequency list attempts whether recovering wireless link, and the result that can not recover wireless link is sent to the second trial unit, and when receiving the result that can not recover wireless link that the second trial unit sends, continue at least one the backup frequency in backup frequency list and attempt whether recovering wireless link, and the result that can not recover wireless link is sent to described second trial unit；Until recovering wireless link in waiting the wireless link recovery time；
Described second recovers failure handling unit, in waiting the wireless link recovery time, all cannot recover wireless link at current frequency, then return current frequency, and enter Radio Link Failure handling process on all of backup frequency in backup frequency list.
Preferably, in above-mentioned all embodiments, described device can also include: timing unit and judging unit, wherein, described timing unit, for when wireless link is detected by terminal, recording from wireless link generation problem to the time spent when detecting that wireless link goes wrong is T01；And record is T02 from wireless link generation problem to primary user's signal time spent when occurring being detected；
Described judging unit, is used for judging whether described T01 is more than T02, if it is greater, then the judged result that will be greater than is sent to described first link-recovery unit；Otherwise, the judged result being less than is sent to the second link-recovery unit；
Described first link-recovery unit, it is additionally operable to when receiving the judged result being more than that the first link-recovery unit sends, in waiting the wireless link recovery time, alternately attempt recovering wireless link between the backup frequency in current frequency and backup frequency list successively；
Described second link-recovery unit, it is additionally operable to when receiving the judged result being less than that the first link-recovery unit sends, waiting in the wireless link recovery time, the backup frequency in backup frequency list and alternately attempt between current frequency recovering wireless link successively.
In described device, the function of unit and the process that realizes of effect refer in said method corresponding to realize process, do not repeat them here.
The present invention solves in cognitive radio networks, when primary user suddenly appears in the frequency range that time user is currently in use, if the interference that secondary user is formed by primary user is the biggest, the system causing time user cannot proper communication, the most secondary user uses and alternately attempts between current frequency and backup frequency recovering wireless link, communication will be continued, to avoid the business of secondary custom system is caused interruption by link switching on new idle frequency spectrum.For CR network, detecting that wireless link goes wrong or primary user occurs when, in the case of terminal cannot carry out proper communication with base station, enable the terminals to be quickly switched into target frequency, complete frequency spectrum switching together with base station, recover business, keep the seriality of business.
In the present embodiment, the fast quick-recovery wireless link when wireless link interrupts, and the method recovering wireless link in this case, referred to as blind switching method.
It should be noted that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation or sequentially that there is any this reality between these entities or operation.And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.
Through the above description of the embodiments, those skilled in the art is it can be understood that can add the mode of required general hardware platform by software to the present invention and realize, naturally it is also possible to by hardware, but a lot of in the case of the former is more preferably embodiment.Based on such understanding, the part that prior art is contributed by technical scheme the most in other words can embody with the form of software product, this computer software product can be stored in storage medium, such as ROM/RAM, magnetic disc, CD etc., including some instructions with so that a computer equipment (can be personal computer, server, or the network equipment etc.) perform each embodiment of the present invention or the method described in some part of embodiment.
The 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; can also make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (14)
1. a wireless link recovery method, it is characterised in that including:
Wireless link is detected by terminal；
When detecting that wireless link goes wrong, in waiting the wireless link recovery time, described terminal alternately attempts recovering wireless link between the first frequency set in advance, and described first frequency set in advance includes: current frequency and the backup frequency in backup frequency list；Or the multiple backup frequencies in backup frequency list；
When detect have primary user's signal to occur on wireless link time, described terminal alternately attempts recovering wireless link between the second frequency set in advance, and described second frequency set in advance includes: the backup frequency in backup frequency list and current frequency；Or the multiple backup frequencies in backup frequency list；
Wherein, also include:
When wireless link is detected by terminal, recording from wireless link generation problem to the time spent when detecting that wireless link goes wrong is T01；And record is T02 from wireless link generation problem to primary user's signal time spent when occurring being detected；
When T01 is less than T02, perform alternately to attempt recovering between described terminal backup frequency successively in current frequency and backup frequency list the step of wireless link；
When T01 is more than T02, performs described terminal backup frequency successively in backup frequency list and alternately attempt between current frequency recovering wireless link.
2. the method for claim 1, it is characterized in that, before wireless link is detected by terminal, described method also includes: described terminal receives the backup frequency list of the different carrier that base station sends, and storing described backup frequency list, the frequency wherein preset is in described backup frequency list.
3. the method for claim 1, it is characterised in that
Described when detecting that wireless link goes wrong, in waiting the wireless link recovery time, described terminal is alternately attempted recovering wireless link between the first frequency set in advance and is included:
When detecting that wireless link goes wrong, in waiting the wireless link recovery time, alternately attempt recovering wireless link between the described terminal backup frequency in current frequency and backup frequency list successively；Or when detecting that wireless link goes wrong, in waiting the wireless link recovery time, alternately attempt recovering wireless link between the described terminal multiple backup frequencies in backup frequency list successively.
4. method as claimed in claim 3, it is characterised in that alternately attempt recovering wireless link between the described terminal backup frequency in current frequency and backup frequency list successively and include:
Described terminal attempts whether recovering wireless link at current frequency, if can not, then at least one the backup frequency in backup frequency list attempts whether recovering wireless link, if can not, then return current frequency attempts whether recovering wireless link, if can't recover wireless link at current frequency, then at least one the backup frequency returned described in performing in backup frequency list attempts whether recovering the step of wireless link；Until recovering wireless link in waiting the wireless link recovery time.
5. the method for claim 1, it is characterised in that
Described when detect have primary user's signal to occur on wireless link time, described terminal alternately attempts recovering wireless link between described second frequency set in advance and includes:
When detect have primary user's signal to occur on wireless link time, waiting in the wireless link recovery time, the described terminal backup frequency in backup frequency list successively and alternately attempt between current frequency recovering wireless link；Or
When detect have primary user's signal to occur on wireless link time, waiting in the wireless link recovery time, alternately attempt recovering wireless link between the described terminal multiple backup frequencies in backup frequency list successively.
6. method as claimed in claim 5, it is characterised in that alternately attempt recovering wireless link between the described terminal backup frequency in backup frequency list successively and currently frequency and include:
Described terminal at least one backup frequency in backup frequency list attempts whether recovering wireless link, if can not, then return current frequency attempts whether recovering wireless link, if wireless link can not be recovered at current frequency, then return and perform described at least one backup frequency in backup frequency list attempts whether recovering wireless link；Until recovering wireless link in waiting the wireless link recovery time.
7. the method as described in claim 3 or 5, it is characterised in that alternately attempt recovering wireless link between the described terminal multiple backup frequencies in backup frequency list successively and specifically include:
Described terminal attempts whether recovering wireless link at current frequency, if can not, then a backup frequency in backup frequency list attempts whether recovering wireless link, if can not, then another backup frequency in backup frequency list attempts whether recovering wireless link, if can't recover wireless link at another backup frequency, then the backup frequency returned described in performing in backup frequency list attempts whether recovering the step of wireless link；Until recovering wireless link in waiting the wireless link recovery time.
8. a wireless link recovery device, it is characterised in that including:
Detector unit, for detecting wireless link；
First link-recovery unit, for when detector unit detects that wireless link goes wrong, in waiting the wireless link recovery time, alternately attempting recovering wireless link between the first frequency set in advance, described first frequency set in advance includes: current frequency and the backup frequency in backup frequency list；Or the multiple backup frequencies in backup frequency list；
Second link-recovery unit, for when detector unit detects and has primary user's signal to occur on wireless link, in waiting the wireless link recovery time, alternately attempting recovering wireless link between the second frequency set in advance, described second frequency set in advance includes: the backup frequency in backup frequency list and current frequency；Or the multiple backup frequencies in backup frequency list；
Wherein, also include:
Timing unit, for when wireless link is detected by terminal, recording from wireless link generation problem to the time spent when detecting that wireless link goes wrong is T01；And record is T02 from wireless link generation problem to primary user's signal time spent when occurring being detected；
Judging unit, is used for judging whether described T01 is less than T02, if it is less, the judged result being less than is sent to described first link-recovery unit；Otherwise, the judged result that will be greater than is sent to the second link-recovery unit；
Described first link-recovery unit, is additionally operable to when receiving the judged result being less than that described judging unit sends, and in waiting the wireless link recovery time, alternately attempts recovering wireless link successively between the backup frequency in current frequency and backup frequency list；
Second link-recovery unit, is additionally operable to when receiving the judged result being more than that described judging unit sends, waiting in the wireless link recovery time, and the backup frequency in backup frequency list and alternately attempt between current frequency recovering wireless link successively.
9. device as claimed in claim 8, it is characterised in that also include:
Receive unit, for before wireless link is detected by detector unit, receive the backup frequency list of the different carrier that base station sends；
Memory element, receives, for storing, the described backup frequency list that unit receives.
10. device as claimed in claim 8, it is characterised in that described first link-recovery unit at least includes following one:
First alternate link recovery unit, for when detecting that wireless link goes wrong, in waiting the wireless link recovery time, alternately attempts recovering wireless link between the backup frequency in current frequency and backup frequency list successively；
First backup link recovery unit, for when detecting that wireless link goes wrong, in waiting the wireless link recovery time, alternately attempts between the multiple backup frequencies in backup frequency list recovering wireless link successively.
11. devices as claimed in claim 10, it is characterised in that described first alternate link recovery unit includes: the first trial unit and the first backup trial unit, wherein,
Described first attempts unit, for when detector unit detects that wireless link goes wrong, attempts whether recovering wireless link at current frequency, and the result that can not recover wireless link is sent to the first backup trial unit；And when receiving the first backup and attempting the result that can not recover wireless link that unit sends, continue current frequency attempts whether recovering wireless link；And the result that can not recover wireless link is sent to the first backup trial unit；
Described first backup trial unit, attempts whether recovering wireless link at least one the backup frequency in backup frequency list, and the result that can not recover wireless link feeds back to described first trial unit；And when receiving the result that can not recover wireless link that the first trial unit sends, at least one the backup frequency continued in backup frequency list attempts whether recovering wireless link；And the result that can not recover wireless link is sent to described first trial unit；Until recovering wireless link in waiting the wireless link recovery time.
12. devices as claimed in claim 10, it is characterized in that, described first backup link recovery unit specifically for, when detector unit detects that wireless link goes wrong, in waiting the wireless link recovery time, if current frequency is attempted recovering wireless link, then a backup frequency in backup frequency list attempts whether recovering wireless link, if can not, then another backup frequency in backup frequency list attempts whether recovering wireless link, if wireless link can't be recovered at another backup frequency, the backup frequency then returned described in performing in backup frequency list attempts whether recovering the step of wireless link；Until recovering wireless link in waiting the wireless link recovery time.
13. devices as claimed in claim 8, it is characterised in that described second link-recovery unit at least includes following one:
Second alternate link recovery unit, for detect have primary user's signal to occur on wireless link time, waiting in the wireless link recovery time, the backup frequency in backup frequency list and alternately attempt between current frequency recovering wireless link successively；
Second backup link recovery unit, for detect have primary user's signal to occur on wireless link time, waiting in the wireless link recovery time, alternately attempt between the multiple backup frequencies in backup frequency list successively recovering wireless link.
14. devices as claimed in claim 13, it is characterised in that described second alternate link recovery unit includes: the second trial unit and the second backup trial unit, wherein,
Described second attempts unit, for when detector unit detects and has primary user's signal to occur on wireless link, attempts unit transmission to the second backup and recovers the instruction of wireless link；And when receiving the result that can not recover wireless link that unit transmission is attempted in described second backup, continue to attempt whether recovering wireless link at current frequency, and the result that can not recover wireless link is sent to dynamic second backup trial unit；
Unit is attempted in described second backup, for when receiving the instruction recovering wireless link that the second trial unit sends, at least one backup frequency in backup frequency list attempts whether recovering wireless link, and the result that can not recover wireless link is sent to the second trial unit, and when receiving the result that can not recover wireless link that the second trial unit sends, continue at least one the backup frequency in backup frequency list and attempt whether recovering wireless link, and the result that can not recover wireless link is sent to described second trial unit；Until recovering wireless link in waiting the wireless link recovery time.
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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| CN103053188A CN103053188A (en) | 2013-04-17 |
| CN103053188B true 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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Citations (4)
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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 |
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| WO2012159297A1 (en) | 2012-11-29 |
| CN103053188A (en) | 2013-04-17 |
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