WO2011017913A1

WO2011017913A1 - Method and user equipment for determining radio link failure

Info

Publication number: WO2011017913A1
Application number: PCT/CN2010/001234
Authority: WO
Inventors: 刘佳敏; 谌丽; 李国庆
Original assignee: 大唐移动通信设备有限公司
Priority date: 2009-08-14
Filing date: 2010-08-13
Publication date: 2011-02-17
Also published as: CN101998431A

Abstract

Provided is a method for determining the Radio Link Failure (RLF), which is used for determining the radio link failure when the Carrier Aggregation (CA) technology is applied. Said method includes: the User Equipment (UE) configured with multiple Component Carriers (CC) performs radio link quality detection on the component carriers; and when the UE finds that the radio links of the specified component carriers of the multiple component carriers all fail, the radio link failure of the UE itself is determined. The present invention also discloses an equipment for implementing said method.

Description

Method for judging wireless link failure and user equipment

The present invention relates to the field of mobile communication technologies, and in particular, to a method for discriminating a radio link failure and a user equipment. Background technique

The peak rate of the upgraded Long Term Evolution (LTE-Advanced) (LTE-A) system is greatly improved compared with the LTE system. To meet this point, the LTE-A system introduces Carrier Aggregation (CA) technology. The carrier aggregation technology refers to a mode in which a plurality of component carriers (CCs) are included in uplink and downlink in one cell, instead of only one set of carriers in LTE and previous wireless communication systems. A plurality of component carriers that are consecutive or discontinuous are grouped together to serve a User Equipment (UE) while needed to provide the required rate. In order to ensure that the UE can work under each aggregated component carrier, the maximum bandwidth of each component carrier does not exceed 20 MHz.

In the prior art, the UE transmits information only through one carrier, and only needs to perform quality detection on one carrier. In the continuous receiving state, the physical layer of the UE evaluates the quality of the radio channel for each radio frame, and performs measurement in a certain period. When the measurement result of the single carrier satisfies the determination condition of the radio link failure, the single carrier wave is determined. Radio link failure (RLF). The radio link failure of the single carrier can determine that the radio link of the UE fails.

In the LTE-A system, the introduction of the CA technology causes the UE to be configured with multiple component carriers. Currently, there is no effective solution for determining the failure of the UE's radio link in the carrier aggregation technology. Summary of the invention

The embodiment of the invention provides a method for discriminating a radio link failure and a user equipment, which are used for discriminating a radio link failure when using a carrier aggregation technology.

A method for determining a failure of a wireless link includes the following steps:

A user equipment UE configured with multiple component carriers performs radio link quality detection on component carriers; When the UE finds that the radio links of the specified component carriers in the multiple component carriers fail, it determines that its own radio link fails.

A user equipment, which is configured with a carrier aggregation technology, where the user equipment is configured with multiple component carriers; the user equipment includes:

a detecting module, configured to perform radio link quality detection on the component carrier;

And a control module, configured to determine that its radio link fails when the radio link of the component carrier specified in the multiple component carriers is found to be faulty.

In the embodiment of the present invention, the radio link failure of the UE is determined by the failure of the radio link of the specified component carrier, and the determination of the radio link failure of the UE in the carrier aggregation technology is implemented. DRAWINGS

1 is a flowchart of a main method for determining a quality of a radio link according to an embodiment of the present invention;

2 is a flow chart of a method for determining a quality of a radio link by using all component carriers according to an embodiment of the present invention;

4 is a flow chart of a method for a UE to report a carrier failure of a radio link failure according to an embodiment of the present invention;

FIG. 5 is a main structural diagram of a UE according to an embodiment of the present invention;

FIG. 6 is a detailed structural diagram of a UE according to an embodiment of the present invention. detailed description

The inventor has found that if the prior art is applied to the LTE-A system, that is, as long as the radio link of one component carrier fails, it is obviously inappropriate to determine the radio link failure of the UE, because the other component carriers of the UE are still Information can be transmitted normally.

In the embodiment of the present invention, when the UE detects that all the specified component carriers of the multiple component carriers fail the radio link, the UE determines that the radio link fails, and solves the radio link in the carrier aggregation technology. The problem of determining the failure.

Referring to FIG. 1, the main method for determining the quality of the radio link in this embodiment is as follows:

Step 101: Configure a user equipment with multiple component carriers to perform radio link quality detection on the component carriers. The UE can detect all configured component carriers, and can also detect the specified member carriers.

Step 102: When the UE finds that the radio links of the specified component carriers of the multiple component carriers fail, determine that the radio link fails.

The component carrier specified in this embodiment is a component carrier for evaluating channel conditions, and may be all member carriers, or may be a component carrier configured with a physical dedicated control channel (PDCCH), or the designated member carrier wave is The RRC layer of the UE is configured to notify the component carrier that the physical layer of the UE needs to detect, or the component carrier where the scheduling information is located, or the primary carrier, or the member of the PDCCH that the UE needs to monitor, and may have other methods. , not listed here. In summary, all component carriers of the UE may be designated component carriers, or part of the component carriers of the UE may be designated component carriers. The implementation of these two cases is described in detail below by means of two embodiments.

Referring to FIG. 2, the method for determining the quality of a radio link by using all component carriers in this embodiment is as follows:

Step 201: The UE performs radio link quality detection on all configured component carriers. In particular, radio link quality detection is performed on all downlink component carriers. The UE performs detection according to the configured detection period, and processes a plurality of detection values in the configured processing period to form a link quality value output. For example, the detection period is 10ms and the processing period is 200ms. The UE detects once every 10 ms, obtains a detection value, and then processes 20 detection values in 200 ms, such as averaging, to obtain a link quality value. The following takes 1 frame as the detection cycle and the processing cycle as an example. The physical layer of the UE is used for wireless link quality detection.

Step 202: When the link quality of the component carrier is lower than the preset quality threshold Qout, the UE generates an out-of-sync indication and updates the out-of-step counter. Each member carrier performs this step when the link shield quantity is lower than the preset quality threshold Qout, and one component carrier corresponds to one out-of-step meter. Number. The initial value of the out-of-step counter is 0, and the out-of-step counter is incremented by one each time an out-of-step indication is received. The physical layer of the UE generates an out-of-synchronization indication and reports it to the Radio Resource Control (RRC) layer of the UE.

Step 203: The UE determines whether the out-of-synchronization counter reaches the preset out-of-synchronization threshold. If yes, proceed to step 204. Otherwise, proceed to step 201 to detect the next frame.

Step 204: The UE starts the T310 timer and stops the out-of-step counter. Continue with step 206. The T310 timer is only one type of timer. In this embodiment, the timer that is started when the out-of-step counter reaches the preset out-of-step threshold is called the T310 timer.

Step 205: When the link quality of the member carrier wave is higher than the preset quality threshold Qin, the UE generates an in-sync indication and clears the out-of-step counter. Proceed to step 201 to detect the next frame.

Step 206: The UE detects the radio link quality of the next frame of the member carrier wave.

Step 207: When the link quality of the component carrier is higher than the preset quality threshold Qin, the UE generates an in-sync indication and updates the synchronization counter. The initial value of the sync counter is 0, and the sync counter is incremented by 1 each time a sync indication is received. If the synchronization counter reaches the preset synchronization threshold, then step 210 is continued, otherwise step 206 is continued.

Step 208: When the link quality of the component carrier is lower than the preset quality threshold Qout, the UE generates an out-of-sync indication and clears the synchronization counter. Continuing to step 206, the next frame is detected.

Step 209: If the T310 timer expires, the UE determines that the radio link of the component carrier fails. Continue with step 211.

Step 210: If the synchronization counter reaches the preset synchronization threshold, the UE determines that the radio link of the component carrier is normal, and continues to step 201.

Step 211: The UE classifies the component carrier from the set A into the set^ and clears the synchronization counter to 0 and starts a recovery timer. The member carriers of the normal wireless link are all classified into the set A, and the member carriers of the failed wireless link are all classified into the set.

Step 212: The UE determines whether all the component carriers are classified into the set B. If yes, the process continues to step 213, otherwise the member is continuation of the step 214.

Step 213: The UE determines that its own radio link fails.

Step 214: The UE detects the radio link quality of the next frame of the component carrier. Continue to step 215, 216 or 218.

Step 215: When the link quality of the component carrier is higher than the preset quality threshold Qin, the UE generates an in-sync indication and updates the synchronization counter. If the synchronization counter reaches the preset synchronization threshold, then step 217 is continued, otherwise step 214 is continued to detect the next frame.

Step 216: When the link shield of the member carrier is lower than the preset shield threshold Qout, the UE generates an out-of-sync indication and clears the synchronization counter. Proceed to step 214 to detect the next frame.

Step 217: If the synchronization counter reaches the preset synchronization threshold, the UE determines that the radio link of the component carrier is normal, and proceeds to step 219.

Step 218: If the recovery timer expires, the UE determines that the radio link of the component carrier fails, and stops detecting the component carrier. Continue to detect other member carriers.

Step 219: The UE classifies the component carrier from the set B into the set A. Proceeding to step 201, the next frame is detected.

The UE may perform steps 201-219 for all component carriers, but if most of the component carriers first perform to step 211 and do not perform to step 217, the last member carrier in the set A will be executed until step 212 is performed. Step 213, that is to say, steps 214-219 may not need to be performed for the last member carrier.

In steps 211, 212, and 219, it is determined whether the radio links of all the component carriers fail by using the set A and the set B. This is only a specific implementation manner, and other implementation manners may be implemented, such as by using the wireless link. The component carrier that failed the path is counted to determine whether the number reaches all component carriers, and if so, the UE determines that its own radio link fails.

In this embodiment, after the T310 timer expires, the timer is automatically resumed to control the time of continuing to detect the member carrier failure of the radio link, which can avoid unrestricted detection and save the detection resources of the UE. Certainly, the recovery timer may not be used. After the T310 timer expires, the component carrier that fails the radio link is continuously detected until the component carrier is deactivated, reconfigured, or the radio link of the UE is determined to be failed. The method may find that the component carrier is restored to normal after the recovery timer expires, so that the link transmission of the component carrier can be restored, and the transmission bandwidth of the UE is restored. Referring to FIG. 3, in the embodiment, a method for determining a quality of a radio link by using a component carrier where a PDCCH is located is as follows:

The PDCCH may be configured on all component carriers, or the PDCCH may be configured on some member carriers. The UE may need to listen to all PDCCHs or monitor part of the PDCCH according to the configuration on the network side. In summary, one UE is configured with at least one PDCCH.

Step 301·. The UE performs radio link shield detection on all configured component carriers. In this embodiment, the UE is mainly concerned with the radio link status of the member carrier in which the PDCCH to be monitored is located, and the following is a description of the component carrier where the PDCCH monitored by the UE is located. For example, the component carriers in which the PDCCH monitored by the UE are located are component carrier 1 and component carrier 2.

Step 302: When the link quality of the component carrier 1 is lower than the preset quality threshold Qout, the UE generates an out-of-sync indication and updates the out-of-step counter.

Step 303: The UE determines whether the out-of-synchronization counter reaches the preset out-of-synchronization threshold. If yes, proceed to step 304. Otherwise, proceed to step 301 to detect the next frame.

Step 304: The UE starts the T310 timer and stops the out-of-step counter. Continue with step 306. Step 305: When the link quality of the component carrier 1 is higher than the preset quality threshold Qin, the UE generates an in-sync indication and clears the out-of-step counter. It can be judged first whether the out-of-step counter is 0. When it is not 0, the out-of-step counter is cleared. Proceed to step 301 to detect the next frame.

Step 306: The UE detects the radio link quality of the next frame of the component carrier 1. Continue with steps 307, 308 or 309.

Step 307: When the link quality of the member carrier wave 1 is higher than the preset quality threshold Qin, the UE generates an in-sync indication and updates the synchronization counter. If the synchronization counter reaches the preset synchronization threshold, then step 310 is continued, otherwise step 306 is continued to detect the next frame.

Step 308: When the link quantity of the component carrier 1 is lower than the preset quality threshold Qout, the UE generates an out-of-sync indication and clears the synchronization counter. Continuing to step 306, the next frame is detected.

Step 309: If the T310 timer expires, the UE determines that the radio link of the component carrier 1 fails. Continue to step 311. Step 310: If the synchronization counter reaches a preset synchronization threshold, the UE determines that the radio link of the component carrier 1 is normal.

Step 311: The UE classifies the component carrier 1 from the set C into the set 0. Clear the sync counter and start the recovery timer. The component carriers of the PDCCH that are normal and configured with the PDCCH are all assigned to the set C, and the component carriers of the PDCCH that need to be monitored by the radio link are classified into the set 0. Continue with step 312.

Step 312: The UE determines whether all the component carriers are classified into the set D. If yes, the process continues to step 313. Otherwise, the component carrier 1 is continued to step 314.

Step 313: The UE determines that its own radio link fails.

Step 314: The UE detects the radio link quality of the next frame of the component carrier 1. Continue with steps 315, 316 or 318.

Step 315: When the link quality of the component carrier 1 is higher than the preset quality threshold Qin, the UE generates an in-sync indication and updates the synchronization counter. If the synchronization counter reaches the preset synchronization threshold, proceed to step 317, otherwise proceed to step 314 to detect the next frame.

Step 316: When the link quality of the component carrier 1 is lower than the preset quality threshold Qout, the UE generates an out-of-sync indication and clears the synchronization counter. Proceed to step 314 to detect the next frame.

Step 317: If the synchronization counter reaches the preset synchronization threshold, the UE determines that the radio link of the member carrier 1 is normal, and proceeds to step 319.

Step 318: If the recovery timer expires, the UE determines that the radio link of the component carrier 1 fails, and stops detecting the component carrier 1. Continue to detect other member carriers.

Step 319: The UE classifies the component carrier 1 from the set D into the set C. Proceed to step 301 to detect the next frame.

The UE may perform steps 301-319 on the component carrier 2, but if the component carrier 1 first proceeds to step 311 and does not perform to step 317, the component carrier 2 must execute to step 313 when performing to step 312, that is, It is said that steps 314-319 may not need to be performed for component carrier 2.

The UE may also perform a step on a component carrier of the unlisted PDCCH and a component carrier not configured with the PDCCH. Steps 301-309, but these component carriers do not participate in the judgment of the radio link status of the UE.

When determining that the radio link of a component carrier fails, the UE may report the member carrier to the network side, especially by using dedicated signaling. Dedicated signaling includes dedicated signaling at the RRC layer, the Medium Access Control (MAC) layer, or the physical layer. This situation is described in detail below.

Referring to FIG. 4, in the embodiment, a method for reporting, by a UE, a component carrier that fails a radio link is as follows:

Step 401: The UE performs radio link shield detection on all configured component carriers.

Step 402: When the T310 timer corresponding to a member carrier timeout expires, the UE reports the identity of the component carrier to the network side through a dedicated signaling. For the process of determining the timeout of the T310 timer corresponding to a member carrier, see steps 202-209.

After receiving the dedicated signaling, the network side may not perform any processing. At this time, the UE continues the steps 210-220 for the component carrier. After the network side receives the dedicated signaling, it performs reconfiguration, activates a new component carrier, or deactivates the member. In addition, these operations affect the member carrier configured for the UE, that is, reduce the component carrier or increase. The new member carrier, etc., continues to step 403.

Step 403: The UE receives the response message returned by the network side, and updates the configured member carrier wave. Step 404: The UE detects the updated member carrier wave. The UE continues the procedure in Figure 2 for the original component carrier, and proceeds to step 401 for the newly configured component carrier (i.e., step 201).

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The UE may report only the component carrier where the PDCCH of the radio link fails, or report any member carrier of the radio link failure. After the network side receives the last 4, it may perform operations such as reconfiguration, activation, and deactivation. These operations may configure the UE with a new component carrier carrying the PDCCH. UE Pass The above process is mainly implemented by the UE. The internal structure and function of the UE are introduced below.

Referring to FIG. 5, the UE adopting the carrier wave aggregation technology in this embodiment includes a detection module 501 and a control module 502.

The detecting module 501 is configured to perform wireless link shield detection on the component carrier. The detecting module 501 is further configured to continue to refer to the finger when the radio link of the component carrier specified in the multiple component carriers fails The fixed component carrier performs radio link quality detection.

The control module 502 is configured to determine that its own radio link fails when it discovers that the radio links of the component carriers specified in the multiple component carriers fail.

The UE also includes an interface module 503, as shown in FIG. The interface module 503 is configured to interact with the network side device, for example, when the radio link of the specified member carrier of the plurality of component carriers is found to be failed, the component carrier is reported to the network side device, and the receiving network side device returns. Response message. When the network side device initiates a reconfiguration, activation, or deactivation operation according to the reported component carrier, the detecting module 501 performs radio link quality detection on the member carrier wave configured after the operation.

The UE also includes: a T310 timer 504 for timing. The control module 502 determines that the T310 timer 504 corresponding to the component carrier specified in the plurality of member carriers times out, and determines that the radio link of the designated member carrier fails.

The UE also includes: a recovery timer 505 for timing. The control module 502 is further configured to start a recovery timer corresponding to the specified component carrier when the radio link of the component carrier specified in the multiple component carriers is found to be failed. Before the recovery timer expires, the detecting module 501 performs a wireless link bulk detection process on the designated member carrier wave, and if the control module 502 continuously obtains a preset number of synchronization indications, determining the wireless chain of the specified component carrier. Road recovery.

The UE further includes: an out-of-step counter and a synchronization counter for counting, which are not shown in this figure. The out-of-step counter is used to count the out-of-step indication. The sync counter is used to count the sync indication. The detection module 501 is configured to generate an out-of-synchronization indication or a synchronization indication, and report it to the control module 502. The out-of-step counter and the sync counter are triggered by the control module 502, and the T310 timer 504 and the resume timer 505 are triggered. The control module 502 is further configured to receive a timeout trigger of the T310 timer 504 and the resume timer 505 and initiate subsequent operations.

The interface module 503 and the detection module 501 in this embodiment belong to the physical layer of the UE, and the control module 502, the T310 timer 504, the recovery timer 505, the out-of-step counter, and the synchronization counter belong to the RRC layer of the UE.

The software for implementing the embodiments of the present invention may be stored in a storage medium such as a floppy disk, a hard disk, an optical disk, and a flash memory. In the embodiment of the present invention, the radio link failure of the UE is determined by the failure of the radio link of the specified component carrier, and the determination of the radio link failure of the UE in the carrier aggregation technology is implemented. The specified component carrier may be used for all the component carriers or the component carrier where the special channel is located, for example, the component carrier where the PDCCH is located. The multiple implementation schemes may be applicable to multiple scenarios or different needs. On the side, the network side is triggered to perform reconfiguration, activation, or deactivation, so that the network can better maintain the network, configure sufficient bandwidth for the UE, and ensure the transmission efficiency of service data.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowcharts and/or block diagrams, and combinations of flow and/or blocks in the flowcharts and/or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. Instructions are provided for implementation in the flowchart The steps of a process or a plurality of processes and/or block diagrams of a function specified in a block or blocks.

Although the preferred embodiment of the invention has been described, it will be apparent to those skilled in the < Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and modifications

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, it is intended that the present invention cover the modifications and variations of the invention as claimed.

Claims

Rights request

A method for discriminating a radio link failure, comprising the steps of: configuring a user equipment UE having a plurality of component carriers to perform radio link quality detection on a component carrier; and the UE discovering a specified member of the plurality of component carriers When the radio link of the carrier fails, it determines that its own radio link fails.

2. The discriminating method according to claim 1, wherein the specified component carrier is the plurality of component carriers; or

a component carrier configured with a physical dedicated control channel PDCCH; or

Notifying the RRC layer of the UE of the UE's physical layer to detect the component carrier; or

Is the component carrier where the scheduling information is located; or

Main carrier; or

The component carrier where the PDCCH that the UE needs to monitor is located.

3. The discriminating method according to claim 1, further comprising:

When the UE finds that the radio link of the specified component carrier of the multiple component carriers fails, the UE reports the component carrier to the network side.

4. The discriminating method according to claim 3, further comprising:

When the UE initiates a reconfiguration, activation, or deactivation operation according to the reported component carrier, the UE performs radio link quality detection on the component carriers configured after the operation.

The discriminating method according to claim 1, wherein the step of the UE discovering that the radio link of the specified member carrier of the plurality of component carriers fails comprises:

The UE finds that the timer corresponding to the specified component carrier of the multiple component carriers times out, and determines that the radio link of the specified component carrier fails.

The discriminating method according to any one of claims 1 to 5, further comprising: when the UE finds that the radio link of the specified component carrier of the plurality of component carriers fails, continuing to the designated component carrier Perform wireless link quality detection; When it is detected that the component carrier whose radio link fails meets the condition of link recovery, it is determined that the radio link of the component carrier is normal.

The discriminating method according to claim 6, wherein, when detecting that the component carrier of the radio link failure meets the condition of the link recovery, determining that the radio link of the component carrier is normal includes:

When the UE finds that the radio link of the specified component carrier of the multiple component carriers fails, the UE starts the recovery timer corresponding to the specified component carrier;

Before the recovery timer expires, during the radio link quality detection process of the specified component carrier, if the synchronization indication that meets the preset number is continuously obtained, it is determined that the radio link of the specified component carrier is normal.

8. A user equipment, comprising:

a detecting module, configured to perform radio link quality measurement on multiple component carriers configured for the user equipment;

And a control module, configured to determine, by the detection module, that the radio link of the specified component carrier of the multiple component carriers fails, determining that the radio link fails.

9. The user equipment according to claim 8, wherein the designated member carrier is the plurality of component carriers; or

Planting waves for members of the scheduling information; or

Main carrier; or

The component carrier where the PDCCH that the UE needs to monitor is located.

The user equipment according to claim 8, further comprising an interface module, configured to report the component carrier to the network side when the radio link of the specified component carrier of the plurality of component carriers is found to be unsuccessful device.

The user equipment according to claim 10, wherein the detecting module, when the network side device initiates a reconfiguration, activation or deactivation operation according to the reported component carrier, The configured component carrier performs radio link quality detection.

12. The user equipment of claim 8, further comprising a T310 timer for timing;

The control module determines that the radio link of the specified component carrier fails when the T310 timer corresponding to the member carrier specified in the multiple component carriers is found to be out of time.

The user equipment according to any one of claims 8 to 12, wherein the detecting module is further configured to continue to perform the designated radio link when the specified component carrier of the plurality of component carriers fails. The component carrier performs radio link quality detection. When it is detected that the component carrier whose radio link fails meets the condition of link recovery, it is determined that the radio link of the component carrier is normal.

14. The user equipment of claim 13, further comprising a recovery timer for timing;

The control module is further configured to: when a radio link of the component carrier specified in the multiple component carriers fails, start a recovery timer corresponding to the specified component carrier;

Before the recovery timer expires, the detecting module performs radio link quality detection on the specified component carrier, and if the control module continuously obtains the synchronization indication that meets the preset number, the radio link of the specified component carrier is determined to be normal.