WO2012159297A1

WO2012159297A1 - Method and device for wireless link recovery

Info

Publication number: WO2012159297A1
Application number: PCT/CN2011/076405
Authority: WO
Inventors: 谢勇
Original assignee: 华为技术有限公司
Priority date: 2011-06-27
Filing date: 2011-06-27
Publication date: 2012-11-29
Also published as: CN103053188A; CN103053188B

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

Wireless link recovery method and device

The present invention relates to the field of communications technologies, and in particular, to a wireless link recovery method and apparatus.

Background technique

Cognitive Radio (CR) is the most promising technology to solve the current spectrum resource shortage. Studies have shown that a large number of currently allocated spectrums are underutilized, which results in a great waste of spectrum resources. By perceiving the wireless spectrum environment, cognitive radios can discover these unoccupied frequency bands and dynamically access these frequency bands without disturbing the primary user (PU, Primary User), thereby improving spectrum utilization. A user who dynamically utilizes spectrum resources through a cognitive radio system, referred to as a secondary user (SU, Second User)

Spectrum sensing is a key technology for cognitive radio. The purpose of spectrum sensing is to monitor and detect the activity of the primary user signal on a particular frequency band. When the presence of the idle spectrum is detected (the primary user signal is not detected), the cognitive radio system can use the spectrum; When the user signal reappears, the cognitive radio system must exit the band within the specified time. However, in order to ensure the continuity of services in the cognitive radio system, after the system exits a certain frequency band, it must immediately switch to the new available frequency band to continue working.

In general, the handover process is: After the base station or the network side decides to switch, the handover command is sent to the terminal, and the terminal performs handover according to the requirements of the command. However, in the cognitive radio system, when the primary user appears and the signal of the primary user is particularly strong, the communication between the base station and the terminal of the cognitive radio system may be seriously deteriorated, and communication may no longer be possible, thereby directly causing service interruption. Therefore, it is currently required. There is a processing mechanism to solve the problem in this case, in order to maximize the guarantee of the strong primary user signal, the cognitive radio communication system communication recovery, to avoid business interruption.

Summary of the invention

Embodiments of the present invention provide a method and apparatus for wireless link recovery to solve the technical problem of recovering a wireless link when a wireless link is interrupted.

To this end, an embodiment of the present invention provides a radio link recovery method, where the method includes: detecting, by a terminal, a radio link;

When it is detected that there is a problem with the wireless link, the terminal alternately attempts to recover the wireless link between the first predetermined frequency points while waiting for the wireless link recovery time. Correspondingly, the embodiment of the present invention further provides a radio link recovery apparatus, where the apparatus includes: a detecting unit, configured to detect a radio link;

And a first link recovery unit, configured to alternately attempt to recover the wireless link between the first preset frequency points while waiting for the wireless link recovery time when the detecting unit detects a problem of the wireless link.

In the embodiment of the present invention, for the CR wireless communication system, when a problem occurs in the wireless link, that is, when the terminal cannot perform normal communication with the base station, the terminal sequentially performs the backup frequency in the current frequency point and the backup frequency point list. Alternate attempts to restore the wireless link between the points; enable the terminal to quickly switch to the target frequency point, complete the spectrum switching with the base station, restore the service, and ensure the continuity of the service.

DRAWINGS

FIG. 1 is a flowchart of a method for restoring a wireless link according to an embodiment of the present invention;

2 is a flowchart of a method for restoring a radio link of a terminal without a sensing function according to an embodiment of the present invention;

3 is a flowchart of a method for recovering a wireless link of a terminal having a sensing function according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a wireless link recovery apparatus according to an embodiment of the present invention.

detailed description

The embodiments of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.

1 is a flowchart of a radio link recovery method according to an embodiment of the present invention, which is applied to a cognitive radio (CR) wireless communication system, where the method includes: Step 101: Terminal to wireless Link detection;

Step 102: When it is detected that there is a problem in the wireless link, the terminal alternately attempts to restore the wireless link between the first preset frequency points while waiting for the wireless link recovery time.

In the embodiment of the present invention, when the terminal detects that there is a problem in the wireless link, it waits for the wireless link recovery time to alternately try to restore the wireless link between the first preset frequency points, thereby solving the problem that the terminal cannot In the case of normal communication with the base station, the terminal can quickly switch to the target frequency point and recover the wireless link, thereby completing spectrum switching with the base station, restoring services, and maintaining service continuity.

Preferably, the first preset frequency point may include: a backup frequency point in the current frequency point and the backup frequency point list; or multiple backup frequency points in the backup frequency point list; but is not limited thereto.

In step 102, when it is detected that there is a problem in the wireless link, while waiting for the wireless link to recover, In the meantime, the terminal alternately attempts to recover the wireless link between the first preset frequency points: when detecting a problem of the wireless link, waiting for the wireless link recovery time, the terminal sequentially Trying to restore the wireless link between the frequency point and the backup frequency point in the backup frequency point list; or when detecting a problem with the wireless link, waiting for the wireless link recovery time, the terminal sequentially lists the backup frequency point Alternate attempts to restore the wireless link between multiple backup frequency points.

The terminal repeatedly attempts to recover the wireless link between the multiple backup frequency points in the backup frequency list in detail, including: the terminal attempts to recover the wireless link at the current frequency point, and if not, the backup A backup frequency point in the frequency list tries to recover the wireless link. If not, try another backup frequency in the backup frequency list to try to recover the wireless link. If it is not at another backup frequency, Upon restoration of the wireless link, the process of performing a backup frequency in the backup frequency list attempt to recover the wireless link is returned; until the wireless link is resumed while waiting for the wireless link recovery time.

The terminal sequentially attempts to recover the wireless link between the current frequency point and the backup frequency point in the backup frequency point list, including: the terminal attempts to recover the wireless link at the current frequency point, and if not, the backup At least one backup frequency point in the frequency list tries to recover the wireless link. If not, it returns to the current frequency point to try to recover the wireless link. If the wireless link cannot be recovered at the current frequency, return to the execution station. The step of attempting to recover the wireless link by at least one backup frequency point in the backup frequency list; until the wireless link is resumed while waiting for the wireless link recovery time;

That is to say, in this step, one case is: If the attempt to recover the wireless link fails at the current frequency point, the first backup frequency point in the backup frequency list can be used to try to recover the wireless link, if in the first If the backup frequency point fails to recover the wireless link, the current frequency point is returned to continue to try to recover the wireless link. If it still fails, the second backup frequency point in the backup frequency list is used to try to restore the wireless link; if in the second If the backup frequency point fails to recover the wireless link, the current frequency point is returned to continue to try to recover the wireless link. If it fails, the third backup frequency point in the backup frequency list is used to try to restore the wireless link; if in the third If the backup frequency point fails to recover the wireless link, the current frequency point is returned to continue to try to recover the wireless link, and so on, until the wireless link is restored or a predetermined waiting time for the wireless link recovery is reached. It should be noted that the time to try to recover the wireless link at the current frequency point and all the backup frequency points is less than or equal to the preset waiting wireless link recovery time.

Another situation is: If you try to recover the wireless link at the current frequency, you can first try to restore the wireless link by using the first backup frequency in the backup frequency list, if you recover at the first backup frequency. If the wireless link fails, try to restore the wireless link by using the second backup frequency in the backup frequency list. If the wireless link fails to recover at the second backup frequency, return to the current frequency point and continue to try to recover the wireless link. If it still fails, try to restore the wireless link using the third backup frequency in the backup frequency list. If it fails, try to restore the wireless link using the fourth backup frequency in the backup frequency list. Failure; return to the current frequency point to continue to try to recover the wireless link, if it still fails, try to restore the wireless link using the fifth backup frequency point in the backup frequency list; if the wireless link is restored at the fifth backup frequency If it fails, try to restore the wireless link by using the sixth backup frequency in the backup frequency list; if the wireless link fails to recover at the sixth backup frequency, return to the current frequency point and continue to try to recover the wireless link, and so on. Until the wireless link is restored or a predetermined waiting radio link recovery time is reached. It should be noted that the time to try to recover the wireless link at the current frequency point and all the backup frequency points is less than or equal to the preset waiting wireless link recovery time.

On the basis of the foregoing embodiments, the three or more backup frequency points of the backup frequency list are used to try to restore the wireless link. The implementation process is similar to the foregoing, and details are not described herein.

In the above embodiment, for the tried backup frequency, it is also possible to try to restore the wireless link again.

Of course, in all the foregoing embodiments, if the wireless link cannot be recovered at all the backup frequency points in the current frequency point and the backup frequency point list while waiting for the wireless link recovery time, return to the current frequency point, and enter The wireless link fails processing process. The radio link failure processing procedure is also well known to those skilled in the art, and details are not described herein again.

Preferably, before the terminal detects the radio link, the method may further include: the terminal receiving a backup frequency point list of different carriers sent by the base station, and storing the backup frequency point list.

That is, the clubhouse, in the CR wireless communication system, in order to avoid system communication being interrupted and unable to recover when a strong primary user signal occurs, the CR wireless communication system maintains a backup frequency point list when it can communicate normally, this list is in The base station and the terminal are synchronized; when the wireless link problem (such as the occurrence of a strong primary user signal, or a large interference or fading) causes the system to fail to communicate normally, the base station first switches to the frequency of a certain backup. The terminal also attempts to switch to a certain backup frequency point according to the scheme of the present invention, and attempts to resume communication with the base station.

Preferably, the method may further include: when the terminal detects that a primary user signal appears on the wireless link, the terminal alternately attempts to restore the wireless link between the second preset frequency points;

Preferably, the second preset frequency point may include: a backup frequency point in the backup frequency point list And the current frequency point; or multiple backup frequency points in the backup frequency point list; but not limited to this; when the primary user signal is detected on the wireless link, the terminal is preset in the second Alternating attempts to recover wireless links between frequency points include:

When it is detected that a primary user signal appears on the wireless link, the terminal alternately attempts to restore the wireless link between the backup frequency point in the backup frequency list and the current frequency point while waiting for the wireless link recovery time; Or

When it is detected that a primary user signal appears on the wireless link, the terminal sequentially attempts to restore the wireless link between the multiple backup frequency points in the backup frequency list while waiting for the wireless link recovery time.

The terminal sequentially attempts to restore the wireless link between the backup frequency point in the backup frequency list and the current frequency point, and specifically includes:

The terminal attempts to recover the wireless link in at least one backup frequency point in the backup frequency list, and if not, returns to the current frequency point to try to recover the wireless link, if the wireless link cannot be recovered at the current frequency point, Returning to the execution of the at least one backup frequency point in the backup frequency list to try to recover the wireless link; until the wireless link recovery time is resumed;

That is to say, in this step, in a case, when the terminal detects that a primary user signal appears on the wireless link, the terminal attempts to recover the wireless link at the first backup frequency point in the backup frequency list. If not, return to the current frequency point to try to recover the wireless link. If not, try to recover the wireless link at the second backup frequency in the backup frequency list. If not, return the current frequency. Click to try to recover the wireless link. If not, try to recover the wireless link at the third backup frequency in the backup frequency list. If not, return to the current frequency point and try to recover the wireless link. , and so on, until the wireless link recovery time is reached or the wireless link is restored; it should be noted that the time to try to restore the wireless link at the current frequency point and all the backup frequency points is less than or equal to the preset waiting wireless link recovery time.

In another case, when the terminal detects that a primary user signal appears on the wireless link, the terminal attempts to recover the wireless link at the first backup frequency point in the backup frequency list. If not, the terminal is backing up. The second backup frequency point in the frequency list attempts to recover the wireless link. If not, it returns to the current frequency point to try to recover the wireless link. If it cannot be recovered at the current frequency, the backup frequency list is The third backup frequency in the attempt tries to recover the wireless link. If not, try to recover the wireless link at the fourth backup frequency in the backup frequency list. If not, return the current frequency. Click to try to recover the wireless link. If it cannot be recovered at the current frequency, it will be backed up. The fifth backup frequency point in the frequency list tries to recover the wireless link. If not, try to recover the wireless link at the sixth backup frequency in the backup frequency list; if in the sixth If the backup frequency cannot recover the wireless link, it will return to the current frequency point to try to recover the wireless link, and so on, until the wireless link is restored or the preset waiting wireless link recovery time is reached. It should be noted that The frequency and all backup frequency points try to recover the wireless link for less than or equal to the preset waiting for the wireless link recovery time.

In the above embodiment, for the tried backup frequency, the process of restoring the wireless link may be tried again.

Of course, in all the above embodiments, if the terminal is unable to recover the wireless link at all the backup frequency points and the current frequency point in the backup frequency list, while waiting for the wireless link recovery time, the current frequency point is returned. The processing continues according to the corresponding wireless communication radio link failure procedure. The radio link failure processing procedure is also well known to those skilled in the art and will not be described herein.

Preferably, in the above embodiment, the method may further include: recording, when the terminal detects the wireless link, a time taken from a problem occurs in the wireless link to when a problem occurs in the wireless link is detected; and Recording the time taken from the problem of the wireless link to the detection of the presence of the primary user signal is T2;

If it is determined that T1 is greater than T2, the terminal first detects a problem of the wireless link, and performs the steps of the terminal sequentially attempting to restore the wireless link between the current frequency point and the backup frequency point in the backup frequency point list; The implementation process is detailed above, and is not described here;

If it is judged that T1 is smaller than T2, it indicates that the terminal first detects that the PU user appears, and the terminal performs an alternate attempt to restore the wireless link between the backup frequency point in the backup frequency list and the current frequency point. The specific implementation process is detailed above, and is not described here;

In general, if the primary user appears and the terminal can correctly receive the data of the base station, the terminal should not initiate the process of blind handover. If the terminal determines that the primary user is present, and the terminal fails to receive the previous multiple subframes or the received signal quality is lower than a certain threshold (such as Qout in LTE), then the wireless link may be considered to have a problem and the invention is activated. The blind handoff process in the described embodiment.

In the embodiment of the present invention, for the CR wireless communication system, when a problem occurs in the wireless link, that is, when the terminal cannot perform normal communication with the base station, the terminal sequentially selects the current frequency point and the backup frequency point. The backup frequency points in the list alternately try to recover the wireless link; enable the terminal to quickly switch to the target frequency point, complete the spectrum switching with the base station, restore the service, and maintain the continuity of the service.

Further, in the case of the CR wireless communication system, when the terminal cannot detect normal communication with the base station when the primary user is detected, the terminal sequentially attempts to recover between the backup frequency point in the backup frequency list and the current frequency point. The wireless link enables the terminal to quickly switch to the target frequency point, complete the spectrum switching with the base station, restore the service, and maintain the continuity of the service.

In a cognitive wireless communication system, a user terminal UE, which generally has two functions, is a user terminal having a sensing function, and a user terminal having no sensing function. For a user terminal with awareness, it always detects whether there is a primary user on the spectrum it uses. Under normal circumstances, the user terminal perceives that the appearance of the primary user is periodic, and makes a judgment in one cycle whether or not the primary user appears. For a terminal that does not have a sensing function, it cannot judge whether or not a primary user appears on the spectrum used.

In order to facilitate the understanding of those skilled in the art, the following is a specific application example.

Example 1

In this embodiment, a radio link recovery method is provided, which is a blind handover processing method applicable to all connected base station UEs under the service of all base stations. In this embodiment, the UE does not consider whether the UE has a sensing function. After the UE determines that the radio link has a problem, it attempts to jump to another alternate frequency point to communicate with the base station, that is, in the current frequency point and the backup frequency point list. As an example, an attempt is made to restore a wireless link between backup frequency points, thereby attempting to restore the wireless link, that is, to resume the service.

For the user terminal in the connected state, after the user terminal finds the wireless link problem, the timer T1 is started, and in the T1 time, the backup frequency of the user terminal period in the current frequency point F0 and the backup frequency point list (in F1) As shown in FIG. 2, FIG. 2 is a flowchart of a method for restoring a radio link of a terminal without a sensing function according to an embodiment of the present invention. In this embodiment, F0, F1, and F2 are working carriers (frequency points;) of the UE during T1 time, and Tf01, Tfl, Tf02, and Tf2 are times at which the attempt to resume the wireless link at the frequency point:

At time t0, the wireless link starts to have a problem, but at time tl, the UE detects the wireless link problem, and the time-consuming record is T01;

From time t1, the UE starts to try to recover the service on different carriers; first try to recover the wireless link on F0; if not, try to recover on a backup frequency point F1 in the backup list; if not, the UE returns F0 Continue to resume trying to recover the wireless link; if it still cannot be recovered, The UE resumes the service on another backup frequency point F2 in the backup list (of course, it is also possible to try one of the above-mentioned frequency points again). And so on, until the time period from T1 to T2, the wireless link is restored; of course, in this embodiment, just use the current frequency point and a backup frequency point to alternately try to recover the wireless link, but not In this case, the current frequency point and the multiple frequency points (sequential attempts) may be used to alternately attempt to recover the wireless link, and the implementation process is similar to the process of alternately attempting to restore the wireless link with the current frequency point and a backup frequency point. This will not be repeated here.

In this embodiment, if the UE is in T1 (ie, the time period between t0 and t2) (ie, waiting for the radio link recovery time), the radio link cannot be alternately restored at the current frequency and the backup frequency. Then, the UE returns to the current frequency point F0 to continue processing. The subsequent processing flow complies with the corresponding wireless communication protocol specifications, such as the 3GPP, and enters the radio link failure processing flow. The failure processing procedure is well known to those skilled in the art, and details are not described herein again.

In this embodiment, for the time relationship, the following rules are set:

T01: The time when the UE detects a problem with the wireless link. This time may vary depending on the detection method of the different systems, and this embodiment is no longer described.

TfOl: Corresponding to the system frequency detection period Tsens. In general, I hope to detect it in the system.

The PU user appears. After the base station switches to the new backup frequency, the terminal can immediately switch to the backup frequency to try to recover the service. Therefore it is recommended that TfOl = Tsens _ T01.

Tfl: Time for the UE to attempt service recovery at the backup frequency point fl. The method of recovery depends on different systems and different methods. Taking 3GPP as an example, it can be considered that the physical layer reports in-sync, and the wireless link is considered to be restored.

Tf02: It is the time required for the UE to resume recovery after returning to f0 after attempting to recover from the backup frequency fl. The method of recovery depends on different systems and different methods.

In the embodiment of the present invention, Tf2 is consistent with the definition of Tfl, and is also consistent with the definition of Tf02.

T1 time: This time should not be greater than the time the system waits for the wireless link to recover when dealing with normal wireless link problems. For example, for an LTE system, after the out-of-sync is reported at the bottom layer, the default in-sync time is ls. If the wireless link does not recover when the time expires, the system considers the wireless link to fail.

In the embodiment of the present invention, for the CR wireless communication system, when a problem occurs in the wireless link, that is, when the terminal cannot perform normal communication with the base station, the terminal sequentially performs the backup frequency in the current frequency point and the backup frequency point list. Alternate attempts to restore the wireless link between points; enabling the terminal to quickly switch to the target frequency Point, complete the spectrum switching with the base station, restore the service, and maintain the continuity of the service.

Example 2

For a terminal with awareness, if it can quickly perceive the appearance of the primary user, it can quickly initiate the blind handover process and minimize the time of service interruption. That is, this embodiment also uses the current frequency and backup. For example, alternately try to restore the wireless link between the backup frequency points in the frequency list.

Referring to FIG. 3, it is a flowchart of a radio link recovery method for a terminal with a sensing function according to an embodiment of the present invention. This embodiment is optimized in Embodiment 1: In this embodiment, F0, F1. And F2 is the working carrier (frequency point) of the UE in the T1 time, and TfOl, Tfl, Tf02, and Tf2 are respectively time to try to recover the wireless link at the frequency point:

At time t0, the PU user appears. At time tl, the UE detects that the PU user appears, and the time-consuming record is T02;

From time t1, the UE starts to try to recover the service on different carriers. First, try to recover the wireless link on a backup frequency point F1 in the backup frequency list; if not, the UE returns to F0 to continue to recover; if it continues at F0 Still can't recover, the UE tries to recover on another backup frequency point F2 in the backup frequency list (of course, it can also try one of the above frequency points again), if it still can't recover, it returns F0 to continue recovery, and so on; Recovering the wireless link until waiting for the radio link recovery time;

In this embodiment, the attempt to restore the wireless link by using the current frequency point and a backup frequency point is used as an example. However, the present invention is not limited thereto, and the current frequency point and the multiple frequency points may also be used. The frequency of each frequency is alternately attempted to restore the wireless link, and the implementation process is similar to the process of alternately attempting to restore the wireless link with the current frequency point and a backup frequency point, and details are not described herein again.

Of course, if the UE cannot recover the service at the current frequency or the backup frequency within the time T1 (ie, the time period between t0 and t2) (ie, waiting for the wireless link recovery time), the UE returns the current frequency. Processing continues on F0. Subsequent processing flows follow the corresponding wireless communication protocol specifications, such as 3GPP.

In this embodiment, the set time relationship is set as follows:

T02: Appears for the PU user, and the UE detects the time when the PU user appears; Generally, the UE detects the PU user cycle and the detection algorithm.

Tfl is the time when the UE attempts to recover the service at the backup frequency point fl. According to different systems and different The method of recovery is different.

TfOl is the time required for the UE to resume recovery after returning to f0 after attempting to recover from the backup frequency fl. The method of recovery depends on different systems and different methods.

Tf2 is the time when the UE attempts service recovery at the backup frequency f2. There are differences between different systems and different methods of confirming recovery.

Tf02 is the time required for the UE to resume recovery after returning to f0 after attempting to recover from the backup frequency f2. The method of recovery depends on different systems and different methods.

In order to optimize the embodiment, in the above-described Embodiment 1 and Embodiment 2,

If T01 < T02, that is, the terminal first detects the radio link problem, the terminal performs an attempt to perform spectrum switching according to the first embodiment.

If T01 > T02, that is, the terminal first detects that the PU user appears, the terminal attempts to perform spectrum switching according to the second embodiment.

In general, if the primary user appears and the terminal can correctly receive the data of the base station, the terminal should not initiate the process of blind handover.

If the terminal determines that the primary user is present, and the terminal fails to receive the previous multiple subframes or the received signal quality is lower than a certain threshold (such as Qout in LTE), then the wireless link may be considered to have a problem and the blind handover is initiated. process.

In the embodiment of the present invention, in the case of the CR network, when the terminal cannot perform normal communication with the base station when the primary user appears, the terminal sequentially attempts to restore the wireless between the backup frequency point in the backup frequency list and the current frequency point. The link enables the terminal to quickly switch to the target frequency point, complete spectrum switching with the base station, restore services, and maintain service continuity.

Based on the implementation process of the foregoing method, the embodiment of the present invention further provides a radio link recovery device, which is shown in FIG. 4, and includes: a detecting unit 41 and a first link restoring unit 42. The detecting unit 41 is configured to detect, by the terminal, the wireless link, and the first link restoring unit 42 is configured to wait for the wireless link recovery time when the detecting unit 41 detects that the wireless link has a problem. In the meantime, an attempt is made to restore the wireless link between the first predetermined frequency points. The first preset frequency point includes: a backup frequency point in the current frequency point and the backup frequency point list; or multiple backup frequency points in the backup frequency point list.

Preferably, the device may further include: a receiving unit and a storage unit, where the receiving unit is configured to receive a backup of different carriers sent by the base station before the detecting unit detects the wireless link. a frequency point list; the storage unit is configured to store the backup frequency point list received by the receiving unit. The first link recovery unit includes: a first alternate link recovery unit and/or a first backup link recovery unit, where the first alternate link recovery unit is configured to detect a wireless link When a problem occurs, waiting for the wireless link recovery time, alternately attempting to restore the wireless link between the current frequency point and the backup frequency point in the backup frequency list; the first backup link recovery unit is used to When a problem occurs in the wireless link, while waiting for the wireless link recovery time, the wireless link is alternately attempted to be restored between the multiple backup frequency points in the backup frequency list.

The first alternate link recovery unit includes: a first attempt unit and a first backup attempt unit, and may further include a recovery failure processing unit, where

The first attempting unit is configured to: when the detecting unit detects a problem of the wireless link, try to recover the wireless link at the current frequency point, and send a result that the wireless link cannot be restored to the first backup attempting unit; And when receiving the result of the unrecoverable wireless link sent by the first backup attempting unit, continuing to try to recover the wireless link at the current frequency point; and transmitting the result that the wireless link cannot be restored to the first backup attempting unit ;

The first backup attempting unit is configured to try to recover a wireless link in at least one backup frequency point in the backup frequency list, and feed back a result that the wireless link cannot be restored to the first attempting unit; Upon receiving the result of the unrecoverable wireless link sent by the first attempting unit, continuing to try to recover the wireless link in at least one backup frequency point in the backup frequency list; and transmitting the result that the wireless link cannot be restored to the The first attempt unit is described; until the wireless link is resumed while waiting for the radio link recovery time.

The first recovery failure processing unit is configured to: when waiting for the wireless link recovery time, fail to recover the wireless link at all the backup frequency points in the current frequency point and the backup frequency point list, return the current frequency point, And enter the wireless link failure processing flow.

Preferably, the first backup link recovery unit is specifically configured to: when the detecting unit detects a problem of the wireless link, while waiting for the wireless link recovery time, if the current frequency point fails to recover the wireless link, A backup frequency point in the backup frequency list tries to recover the wireless link. If not, try another backup frequency in the backup frequency list to try to recover the wireless link. If another backup frequency is used. If the wireless link cannot be recovered, the process of performing the backup frequency point in the backup frequency list attempt to recover the wireless link is returned; until the wireless link is resumed while waiting for the wireless link recovery time. Preferably, in the foregoing embodiment, the apparatus may further include: a second link recovery unit, configured to wait for a wireless link recovery time when the detecting unit detects that a primary user signal is present on the wireless link, Alternate attempts to recover the wireless link between the second predetermined frequency points.

The second preset frequency point includes: a backup frequency point and a current frequency point in the backup frequency point list; or multiple backup frequency points in the backup frequency point list; but is not limited thereto.

Preferably, the second link recovery unit includes at least one of the following: a second alternate link recovery unit, and/or a second backup link recovery unit, where the second alternate link recovery unit is configured to When detecting that a primary user signal appears on the wireless link, while waiting for the wireless link recovery time, alternately try to restore the wireless link between the backup frequency point in the backup frequency list and the current frequency point; the second backup chain The path recovery unit is configured to alternately try to restore the wireless link between the multiple backup frequency points in the backup frequency list list while waiting for the wireless link recovery time when detecting that the primary user signal appears on the wireless link. .

The second alternate link recovery unit includes: a second attempt unit and a second backup attempt unit, and further includes a second recovery failure processing unit, where

The second attempting unit is configured to: when the detecting unit detects that a primary user signal appears on the wireless link, send an indication to the second backup attempting unit to restore the wireless link; and receive the second backup attempting unit When the result of the transmission cannot recover the wireless link, it continues to try to recover the wireless link at the current frequency, and sends the result that the wireless link cannot be restored to the second backup attempt unit; the second backup attempt unit, When receiving the indication of the resumed wireless link sent by the second attempting unit, attempting to recover the wireless link in at least one backup frequency point in the backup frequency list, and sending the result that the wireless link cannot be restored to The second attempting unit, and upon receiving the result of the non-recoverable wireless link sent by the second attempting unit, continuing to attempt to recover the wireless link at the at least one backup frequency point in the backup frequency list, and the wireless connection cannot be restored The result of the link is sent to the second attempt unit; until the wireless link is resumed while waiting for the radio link recovery time;

The second recovery failure processing unit is configured to: when waiting for the wireless link recovery time, fail to recover the wireless link at all the backup frequency points in the current frequency point and the backup frequency point list, return the current frequency point, And enter the wireless link failure processing flow.

Preferably, in all the above embodiments, the apparatus may further include: a timing unit and a determining unit, wherein the timing unit is configured to record a problem from the wireless link when the terminal detects the wireless link The time it takes to detect a problem with the wireless link is T01; and the record is never The time taken by the line link to detect the occurrence of the primary user signal is T02; the determining unit is configured to determine whether the T01 is greater than T02, and if greater than, send a greater than the determination result to the first a link recovery unit; otherwise, transmitting a judgment result that is smaller than the second link recovery unit;

The first link recovery unit is further configured to: in the waiting time of the radio link recovery time, in the current frequency point and the backup frequency point list, when receiving the greater than the determination result sent by the first link recovery unit Alternate attempts to restore the wireless link between backup frequency points;

The second link recovery unit is further configured to: when receiving the less than the determination result sent by the first link recovery unit, waiting for the backup frequency in the backup frequency list in the wireless link recovery time Alternate attempts to restore the wireless link between the current frequencies.

For the implementation process of the functions and functions of the various units in the device, refer to the corresponding implementation process in the above method, and details are not described herein again.

The invention solves the problem that in the cognitive radio network, when the primary user suddenly appears in the frequency band that the secondary user is using, if the primary user has a great interference to the secondary user, the secondary user's system cannot communicate normally, and the secondary user Using the current frequency point and the backup frequency point to alternately try to recover the wireless link, that is, the link is switched to the new idle spectrum to continue communication, so as to avoid interruption of the service of the secondary user system. For the CR network, when the terminal detects that the wireless link is faulty or the primary user appears, the terminal cannot perform normal communication with the base station, so that the terminal can quickly switch to the target frequency point, complete the spectrum switching with the base station, and resume the service. Maintain business continuity.

In this embodiment, the method of recovering the wireless link quickly when the wireless link is interrupted, and the method of restoring the wireless link in this case is called a blind handover method.

It should be noted that, in this context, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply such entities or operations. There is any such actual relationship or order between them. Furthermore, the terms "including", "comprising" or "comprising" or "comprising" are intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that includes a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. An element defined by the statement "comprising a ..." without further limitation does not exclude the existence of additional identical elements in the process, method, article or device including the element.

Through the description of the above embodiments, those skilled in the art can clearly understand the present invention. It can be implemented by means of software plus the necessary general hardware platform, of course, it can also be through hardware, but in many cases the former is a better implementation. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product in essence or in the form of a software product, which may be stored in a storage medium such as a ROM/RAM or a disk. , an optical disk, etc., includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It is considered as the scope of protection of the present invention. .

Claims

Rights request

A radio link recovery method, comprising:

The terminal detects the wireless link;

When a problem with the wireless link is detected, the terminal alternately attempts to recover the wireless link between the first predetermined frequency points while waiting for the wireless link recovery time.

The method according to claim 1, wherein before the detecting the wireless link by the terminal, the method further includes: the terminal receiving a backup frequency point list of different carriers sent by the base station, and storing the The frequency point list is backed up, wherein the preset frequency point is in the backup frequency point list.

The method according to claim 1 or 2, wherein the first preset frequency point comprises: a backup frequency point in a current frequency point and a backup frequency point list; or in a backup frequency point list Multiple backup frequency points;

When detecting a problem in the wireless link, while waiting for the wireless link recovery time, the terminal alternately attempts to recover the wireless link between the first preset frequency points, including:

When detecting a problem with the wireless link, while waiting for the wireless link recovery time, the terminal alternately attempts to restore the wireless link between the current frequency point and the backup frequency point in the backup frequency list; or when detecting When there is a problem in the wireless link, the terminal alternately attempts to restore the wireless link between the multiple backup frequency points in the backup frequency list while waiting for the wireless link recovery time.

4. The method according to claim 3, wherein the terminal sequentially attempts to recover the wireless link between the current frequency point and the backup frequency point in the backup frequency point list, including:

Whether the terminal attempts to recover the wireless link at the current frequency point, and if not, attempts to recover the wireless link in at least one backup frequency point in the backup frequency list, and if not, returns to the current frequency point to try whether Recovering the wireless link, if the wireless link cannot be recovered at the current frequency point, returning to perform the step of attempting to recover the wireless link by performing at least one backup frequency point in the backup frequency list; until waiting for the wireless link The wireless link is restored within the recovery time.

The method according to any one of claims 1 to 4, further comprising: when detecting that a primary user signal appears on the wireless link, the terminal is at a second preset frequency point Alternate attempts to recover the wireless link.

The method according to claim 5, wherein the second preset frequency point comprises: a backup frequency point and a current frequency point in the backup frequency point list; or multiple in the backup frequency point list Backup frequency point; When detecting that a primary user signal appears on the wireless link, the terminal alternately attempts to recover the wireless link between the second preset frequency points, including:

The method according to claim 6, wherein the terminal sequentially attempts to recover the wireless link between the backup frequency point in the backup frequency list and the current frequency point, including:

The terminal attempts to recover the wireless link in at least one backup frequency point in the backup frequency list, and if not, returns to the current frequency point to try to recover the wireless link, if the wireless link cannot be recovered at the current frequency point, Returning to the execution of the at least one backup frequency point in the backup frequency list to try to recover the wireless link; until the wireless link recovery time is resumed while waiting for the wireless link recovery time.

The method according to any one of claims 1 to 7, further comprising: when the terminal detects the wireless link, recording when a problem occurs from the wireless link to when a problem occurs in the wireless link is detected The elapsed time is TO 1; and the time taken from the occurrence of a problem on the wireless link to the detection of the presence of the primary user signal is T02;

When T01 is greater than T02, performing the steps of the terminal sequentially attempting to restore the wireless link between the current frequency point and the backup frequency point in the backup frequency point list;

When T01 is less than T02, the terminal performs an attempt to restore the wireless link alternately between the backup frequency point in the backup frequency list and the current frequency point.

The method according to claim 3 or 6, wherein the terminal sequentially attempts to recover the wireless link between the multiple backup frequency points in the backup frequency list specifically includes:

Whether the terminal attempts to recover the wireless link at the current frequency point, and if not, attempts to recover the wireless link at a backup frequency point in the backup frequency list, and if not, the other in the backup frequency list A backup frequency point attempts to recover the wireless link. If the wireless link cannot be recovered at another backup frequency point, return to perform a backup frequency point in the backup frequency list to try to recover the wireless link. Step; until the wireless link is resumed while waiting for the radio link recovery time.

A radio link recovery device, comprising:

a detecting unit, configured to detect a wireless link; The first link recovery unit is configured to alternately try to recover the wireless link between the first preset frequency points while waiting for the wireless link recovery time when the detecting unit detects a problem of the wireless link.

The device of claim 10, further comprising:

a receiving unit, configured to receive a backup frequency point list of different carriers sent by the base station before the detecting unit detects the wireless link;

And a storage unit, configured to store the backup frequency point list received by the receiving unit.

The device according to claim 10 or 11, wherein the first link recovery unit comprises at least one of the following:

The first alternate link recovery unit is configured to alternately try to resume wireless between the current frequency point and the backup frequency point in the backup frequency point list while waiting for the wireless link recovery time when detecting a problem in the wireless link. Link

The first backup link recovery unit is configured to alternately try to recover the wireless link between the multiple backup frequency points in the backup frequency point list while waiting for the wireless link recovery time when detecting a problem of the wireless link .

The apparatus according to claim 12, wherein the first alternate link recovery unit comprises: a first attempt unit and a first backup attempt unit, wherein

The device according to claim 12, wherein the first backup link recovery unit is specifically configured to: when the detecting unit detects a problem of the wireless link, wait for the wireless link recovery time, if A current frequency point attempt cannot restore the wireless link, then a backup in the backup frequency list At the frequency point, try to recover the wireless link. If not, try to restore the wireless link at another backup frequency in the backup frequency list. If the wireless link cannot be recovered at another backup frequency, return. Performing the step of attempting to recover the wireless link at a backup frequency point in the backup frequency list; until the wireless link is resumed while waiting for the wireless link recovery time.

The device according to any one of claims 10 to 14, further comprising: a second link recovery unit, configured to wait while the detecting unit detects that a main user signal appears on the wireless link During the wireless link recovery time, an attempt is made to resume the wireless link between the second predetermined frequency points.

16. The apparatus according to claim 15, wherein the second link recovery unit comprises at least one of the following:

a second alternate link recovery unit, configured to periodically wait between the backup frequency point in the backup frequency list and the current frequency point when detecting that the primary user signal appears on the wireless link, while waiting for the wireless link recovery time Alternate attempts to recover the wireless link;

a second backup link recovery unit, configured to alternately try to alternate between multiple backup frequency points in the backup frequency point list while waiting for the wireless link recovery time when detecting that the primary user signal appears on the wireless link Restore the wireless link.

The apparatus according to claim 16, wherein the second alternate link recovery unit comprises: a second attempt unit and a second backup attempt unit, wherein

The second attempting unit is configured to: when the detecting unit detects that a primary user signal appears on the wireless link, send an indication to the second backup attempting unit to restore the wireless link; and receive the second backup attempting unit When the result of the transmission cannot recover the wireless link, it continues to try to recover the wireless link at the current frequency, and sends the result that the wireless link cannot be restored to the second backup attempt unit; the second backup attempt unit, When receiving the indication of the resumed wireless link sent by the second attempting unit, attempting to recover the wireless link in at least one backup frequency point in the backup frequency list, and sending the result that the wireless link cannot be restored to The second attempting unit, and upon receiving the result of the non-recoverable wireless link sent by the second attempting unit, continuing to attempt to recover the wireless link at the at least one backup frequency point in the backup frequency list, and the wireless connection cannot be restored The result of the link is sent to the second attempt unit; until the wireless link is resumed while waiting for the radio link recovery time.

The device according to any one of claims 10 to 17, further comprising: a timing unit, configured to record a problem from the wireless link when the terminal detects the wireless link The time taken to detect a problem with the wireless link is T01; and the time taken from the occurrence of the problem on the wireless link to the detection of the presence of the primary user signal is T02;

a determining unit, configured to determine whether the T01 is greater than T02, if greater than, send a greater than the determination result to the first link recovery unit; otherwise, send a smaller result to the second link recovery unit;

The first link recovery unit is further configured to: when receiving the greater than the determination result sent by the determining unit, wait for the backup frequency in the current frequency point and the backup frequency point list while waiting for the wireless link recovery time Alternate attempts to restore the wireless link between points;

The second link recovery unit is further configured to, when receiving the less than the determination result sent by the determining unit, wait for the backup frequency point and the current frequency point in the backup frequency point list in the waiting time of the wireless link recovery time. Alternate attempts to recover the wireless link.