CN106851697B

CN106851697B - Method and device for detecting synchronization and synchronization loss of wireless link

Info

Publication number: CN106851697B
Application number: CN201510881919.0A
Authority: CN
Inventors: 程迎辉; 张勇; 李纪奎
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2015-12-03
Filing date: 2015-12-03
Publication date: 2020-03-20
Anticipated expiration: 2035-12-03
Also published as: CN106851697A

Abstract

A method and a device for detecting synchronization and de-synchronization of wireless links are provided, the method for detecting synchronization and de-synchronization of wireless links comprises the following steps: detecting a special channel of TPC or a special channel of CRC to obtain a synchronization or desynchronization primitive; when the synchronization primitive or the desynchronization primitive does not meet the radio link failure criterion, acquiring the packet loss state of an RLC layer; when the RLC layer loses packets, detecting a special channel of the TPC to obtain a first out-of-step frame number; detecting a special channel of the CRC and a special channel of the DP to respectively obtain a second out-of-step frame number and a third out-of-step frame number; comparing the first out-of-step frame number with a first threshold to obtain the synchronous out-of-step state of the TPC, and comparing the second out-of-step frame number and the third out-of-step frame number with a second threshold and a third threshold respectively to obtain the synchronous out-of-step state of the CRC and the synchronous out-of-step state of the DP; and when the TPC, the CRC or the DP is in an out-of-step state, the wireless link is in an out-of-step state. The method and the device for detecting the synchronization and the de-synchronization of the wireless link improve the accuracy of the synchronization and the de-synchronization of the wireless link.

Description

Method and device for detecting synchronization and synchronization loss of wireless link

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for detecting synchronization and synchronization loss of a wireless link.

Background

In a mobile communication system, the uplink refers to the physical channel from a mobile device to a base station, and the downlink refers to the physical channel from the base station to the mobile device. Uplink and downlink are out of synchronization due to the interaction of the uplink and downlink during communication. The loss of synchronization is characterized in that asynchronous signals will interfere signals of adjacent time slots, and when the phase shift is serious, uplink signals are transmitted in downlink time slots or downlink signals are transmitted in uplink time slots, which causes serious interference to communication in a service area, resulting in degradation of call quality and telephone traffic indexes of the service area, for example: the noise is large during the call, the number of downlink paging response frames is low, the frequency blocking rate is high and the like; in severe cases, lost time slots and base station blocking are also caused.

In the prior art, a synchronization and de-synchronization detection method in a Radio Link is specified in a protocol 25.332, and data in a Radio Link Control protocol (RLC) layer is detected; the RLC layer is located above a Media Access Control (MAC) sublayer, and provides a segmentation and retransmission service for user and Control data. The prior art can also determine whether there is a problem with the physical channel link by detecting the quality of the decoded data and the quality of the power control word. User Equipment (UE) monitors the Channel quality of a Dedicated Physical Channel (DPCH) of a high-speed downlink shared Channel serving cell, and if the Channel quality of the DPCH is higher than a preset threshold Qin within the nearest 160ms, a Physical layer of the UE generates a synchronization primitive (CPHY-Sync-IND); if the channel quality of the DPCH is lower than a preset threshold Qout, the physical layer of the UE generates an Out-of-synchronization primitive (CPHY-Out-of-Sync-IND). By using the synchronization primitive and the out-of-synchronization primitive, a Radio Resource Control (RRC) layer of the UE further determines whether the link is out-of-synchronization, and the specific processing procedure is specified in the 25.331 protocol as follows: if the UE continuously receives preset N313 out-of-sync primitives reported by the physical layer, a timer T313 is started. Before the timer T313 is overtime, if the UE continuously receives synchronous primitives reported by N315 preset physical layers, the timer is reset; otherwise, if T313 times out and the UE fails to continuously receive the synchronization primitives reported by the preset N315 physical layers, the UE determines that the radio link is out of synchronization, and performs corresponding link out-of-synchronization processing, for example, initiates a cell update procedure, and notifies the network side that the radio link is out of synchronization.

However, in the radio link synchronization and de-synchronization detection method in the prior art, the detection of data in the RLC layer depends on parameters such as the number of trigger frames of a restart (Reset) procedure, the maximum number of retransmission frames of the data, the window size, and the like; the detection of the quality of the decoded data and the quality of the power control word depends on the control of parameters such as N313, N315, T313 and the like; the synchronous and asynchronous detection process depends on the configuration, so that the time from the beginning of asynchronous to the disconnection of a real link is long, the transmission quality of a wireless link is influenced, and the quality of service (QoS) of a user is reduced; under the condition that a problem occurs in the channel configuration change process, the accuracy of synchronous and asynchronous detection is low.

Disclosure of Invention

The invention solves the technical problem of how to improve the accuracy of synchronous and asynchronous detection of a wireless link.

In order to solve the above technical problem, an embodiment of the present invention provides a method for detecting synchronization and synchronization of a wireless link, where the method for detecting synchronization and synchronization of a wireless link includes:

detecting a special channel of TPC or a special channel of CRC to obtain a synchronization or desynchronization primitive;

when the synchronization primitive or the desynchronization primitive does not meet the radio link failure criterion, acquiring the packet loss state of an RLC layer;

when the RLC layer loses packets, detecting a special channel of the TPC to obtain a first out-of-step frame number;

detecting the special channel of the CRC and the special channel of the DP to respectively obtain a second out-of-step frame number and a third out-of-step frame number;

comparing the first out-of-step frame number with a first threshold to obtain the synchronous out-of-step state of the TPC, and comparing the second out-of-step frame number and the third out-of-step frame number with a second threshold and a third threshold respectively to obtain the synchronous out-of-step state of the CRC and the synchronous out-of-step state of the DP;

and when the TPC, the CRC or the DP are in an out-of-step state, the wireless link is in an out-of-step state.

Optionally, when the TPC is in a synchronous state or both the CRC and the DP are in a synchronous state, the radio link is in a synchronous state.

Optionally, when the TPC is in a synchronous state, the first out-of-sync frame number is compared with a first threshold, and the dedicated channels of the CRC and the DP are detected to obtain a second out-of-sync frame number and a third out-of-sync frame number.

Optionally, the method for detecting synchronization and synchronization loss of a wireless link further includes: when the in-synchronization or out-of-synchronization primitive satisfies a radio link failure criterion, releasing the link and triggering a radio link failure procedure.

Optionally, the method for detecting synchronization and synchronization loss of a wireless link further includes: and when the TPC is in an out-of-step state or both the CRC and the DP are in an out-of-step state, releasing the link and triggering a radio link failure process.

Optionally, the first threshold, the second threshold, and the third threshold are set according to a signal quality of a serving cell.

Optionally, when the first out-of-step frame number is greater than or equal to the first threshold, determining that the TPC is out-of-step; when the second out-of-step frame number is greater than or equal to the second threshold, judging the CRC to be out-of-step; and when the third out-of-step frame number is greater than or equal to the third threshold, determining that the DP is out-of-step.

In order to solve the above technical problem, an embodiment of the present invention further discloses a device for detecting synchronization and synchronization of a wireless link, where the device for detecting synchronization and synchronization of a wireless link includes:

the out-of-step detection unit detects the special channels of the TPC and the CRC to obtain a synchronization or out-of-step primitive;

the RLC state acquisition unit acquires the packet loss state of an RLC layer when the synchronization primitive or the desynchronization primitive does not meet the radio link failure criterion;

a TPC step-out detection unit, which detects a special channel of the TPC when the RLC layer loses packets to obtain a first step-out frame number;

the CRC and DP out-of-step detection unit is used for detecting the special channels of the CRC and the DP to obtain a second out-of-step frame number and a third out-of-step frame number;

the step-out comparison unit compares the first step-out frame number with a first threshold to obtain the synchronous step-out state of the TPC, and compares the second step-out frame number and the third step-out frame number with a second threshold and a third threshold respectively to obtain the synchronous step-out state of the CRC and the DP;

and the out-of-step judging unit is used for judging that the wireless link is in an out-of-step state when the TPC, the CRC or the DP is in the out-of-step state.

Optionally, the apparatus for detecting synchronization and synchronization loss of wireless links further includes:

and the triggering unit is coupled with the out-of-step judging unit and is suitable for releasing the link and triggering a radio link failure process.

Optionally, the triggering unit is coupled to the RLC state acquisition unit, and enters the triggering unit when the in-synchronization or out-of-synchronization primitive meets a radio link failure criterion.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

the embodiment of the invention detects the special channel of TPC or the special channel of CRC to obtain the synchronization or desynchronization primitive, and obtains the packet loss state of RLC layer when the synchronization or desynchronization primitive does not meet the failure criterion of wireless link; detecting the special channel of the TPC, the special channel of the CRC and the special channel of the DP to respectively obtain a first out-of-step frame number, a second out-of-step frame number and a third out-of-step frame number; and comparing the first out-of-step frame number, the second out-of-step frame number and the third out-of-step frame number with a first threshold, a second threshold and a third threshold respectively to obtain the synchronous out-of-step state of the TPC, the CRC and the synchronous out-of-step state of the DP, and judging the synchronous out-of-step state of the wireless link according to the synchronous out-of-step state of the TPC, the CRC or the DP. According to the embodiment of the invention, the packet loss state of the RLC layer, the TPC and the out-of-step state of the CRC physical layer are judged in a combined manner, and DP, TPC and CRC are introduced for evaluation in a matched manner, so that the accuracy of synchronous out-of-step detection of the wireless link is improved; meanwhile, under the condition that a problem occurs in the channel configuration change process, the link problem can be detected better and quickly in time, and the problem link resource is released quickly, so that better user experience is obtained.

Further, the first threshold, the second threshold, and the third threshold in the embodiment of the present invention are set according to the signal quality of the serving cell; the first threshold, the second threshold and the third threshold are dynamically adjusted through dynamic change of signal quality, and accuracy of synchronous out-of-step detection of the wireless link is improved.

Drawings

Fig. 1 is a flow chart of a method for detecting synchronization and synchronization loss of a wireless link according to an embodiment of the present invention;

FIG. 2 is a flow chart of another method for detecting synchronization loss of a wireless link according to an embodiment of the present invention;

FIG. 3 is a flow chart of a method for determining an out-of-synchronization status according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a device for detecting synchronization and synchronization loss of a wireless link according to an embodiment of the present invention.

Detailed Description

As described in the background art, in the radio link synchronization and de-synchronization detection method in the prior art, the detection of data in the RLC layer depends on parameters such as the number of trigger frames of a restart (Reset) procedure, the maximum number of retransmission frames of the data, and the window size; the detection of the quality of the decoded data and the quality of the power control word depends on the control of parameters such as N313, N315, T313 and the like; the synchronous and asynchronous detection process depends on the configuration, so that the time from the beginning of asynchronous to the disconnection of a real link is long, the transmission quality of a wireless link is influenced, and the quality of service (QoS) of a user is reduced; under the condition that a problem occurs in the channel configuration change process, the accuracy of synchronous and asynchronous detection is low.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Fig. 1 is a flowchart of a method for detecting synchronization and synchronization loss of a wireless link according to an embodiment of the present invention.

Referring to fig. 1, the method for detecting synchronization and synchronization loss of a wireless link includes: step S101, a radio link detection state is entered.

In this embodiment, the UE and a UMTS Terrestrial Radio Access Network (UTRAN) perform communication data transmission through an uplink and a downlink, and enter a Radio link detection state after establishing Radio Resource Control (RRC) connection with the UTRAN.

Step S102, the synchronous and asynchronous detection of the wireless link is carried out frame by frame.

In this embodiment, after configuring a downlink or an uplink for a UE, a base station (Node B) monitors the uplink or downlink channel condition of the UE in each uplink or downlink radio frame allocated to the UE. The data transmission state of each frame of the wireless link is detected to obtain the out-of-step frame number of the wireless link, and the synchronous out-of-step state of the wireless link is judged according to the out-of-step frame number and a judgment threshold.

Step S103, releasing the wireless link.

In this embodiment, after the synchronization and de-synchronization detection of the wireless link is completed, the link is released. When the UE determines that the radio link is in an out-of-step state, the UE releases the link and triggers a radio link failure process, and executes a corresponding link out-of-step process, for example, initiates a cell update process to notify a network side that the radio link is out-of-step; and when the UE judges that the wireless link is in a synchronous state, releasing the link.

Fig. 2 is a flow chart of another method for detecting synchronization and synchronization loss of a wireless link according to an embodiment of the present invention.

Referring to fig. 2, the radio link synchronization and de-synchronization detection method shown in fig. 2 is a specific flowchart of step S102, and the radio link synchronization and de-synchronization detection method includes:

step S201, detects the dedicated channel of TPC or the dedicated channel of CRC to obtain the synchronization or desynchronization primitive.

In this embodiment, Transmission Power Control (TPC) is Control data information for Power Control in the 3G communication network. Cyclic Redundancy Check (CRC) uses the principle of division and remainder for Error detection (Error detection). In practical application, Node B calculates CRC value and sends it to UE along with data, UE recalculates CRC value for received data and compares it with received CRC value, if two CRC values are different, it shows that data communication error occurs.

In this embodiment, the RRC sublayer is divided into an idle mode and a connected mode according to whether an RRC connection exists. Triggering the migration between RRC sublayer states according to the change of the radio resource allocation condition; while the transition between idle and connected modes is triggered by the establishment and release of the RRC connection.

In one embodiment, synchronization is referred to as In-Sync and Out-of-Sync is referred to as Out-of-Sync. In a dedicated channel connection state, i.e., a CELL _ DCH state, a UE physical layer periodically reports In-Sync to an upper layer using a synchronization primitive (CPHY-Sync-IND) or reports Out-of-Sync to the upper layer using an Out-of-Sync primitive (CPHY-Out-of-Sync-IND), and when a set number of Out-of-Sync are continuously received, the UE determines that the radio link fails and notifies a Node B of the radio link failure.

In a specific implementation, the radio link failure criterion includes: the UE physical layer needs to report In-Sync with a synchronization primitive (CPHY-Sync-IND) if any of the following conditions is met.

a. UE estimates that the burst quality of the special channel is higher than a threshold Qin in the last 160ms period, wherein Qin is a preset value;

b. in the last 160ms period, the UE detects at least one special burst whose quality is higher than a threshold value Qsbin, which is a preset value;

c. at least one transport module with CRC in a TTI ends with the correct CRC value in the current frame.

In a specific implementation, the radio link failure criterion includes: an Out-of-Sync primitive (CPHY-Out-of-Sync-IND) needs to be reported if the following three conditions are met simultaneously.

a. UE estimates that the burst quality of the dedicated channel is lower than a threshold value Qout in the last 160ms period, and the numerical value Qout is a preset value;

b. in the last 160ms period, no special burst with quality higher than the threshold value Qsbout is detected, and the value Qsbout is a preset value;

c. within the first 160ms, no data with the correct CRC value is received.

Step S202, judging whether the synchronization or out-of-synchronization primitive meets the wireless link failure criterion, if so, entering step S203, otherwise, entering step S204.

Step S203, release the link and trigger the radio link failure procedure.

In this embodiment, the radio link failure procedure includes executing a corresponding link out-of-step process, for example, initiating a cell update procedure, and notifying the network side that the radio link is out-of-step, so as to quickly release the radio link with problems and establish a new radio link.

Step S204, the packet loss state of the RLC layer is obtained.

It should be noted that, the embodiment of the present invention triggers the evaluation of the channel synchronization status by detecting the data loss of the downlink.

Step S205, judging whether the RLC layer has lost packet, if yes, entering step S206, otherwise, ending the synchronous out-of-sync detection of the wireless link.

Step S206, determine whether the dedicated channel of the wireless link is F-DPCH, if yes, go to step S207, otherwise go to step S208.

In this embodiment, a Fractional Dedicated Physical Channel (F-DPCH) is introduced as a substitute for a downlink associated Dedicated Physical Control Channel (DPCCH) in order to improve a downlink Channel code utilization rate by an R6 protocol, and the F-DPCH may transmit a Control command at 10 UEs per timeslot; the enhanced F-DPCH may keep more UEs in the in-use channel connected state (CELL _ DCH) state at the same time. When the dedicated Channel of the radio link is not the F-DPCH, the dedicated Channel of the radio link is a Dedicated Physical Channel (DPCH). The DPCH is used for transmitting user data and an FDPCH channel may be introduced in order to be able to convey control information in the downlink direction.

Step S207, out-of-step evaluation is performed on the TPC.

In this embodiment, when the dedicated channel is a fractional dedicated physical channel (F-DPCH), the TPC is subjected to out-of-step estimation, and the dedicated channel of the TPC is detected to obtain a first out-of-step frame number.

Step S208, the CRC and the DP are evaluated for out-of-synchronization.

In this embodiment, when the dedicated channel is the DPCH, the dedicated channel of the CRC and the dedicated channel of the Dedicated Pilot (DP) are detected to obtain a second out-of-sync frame number and a third out-of-sync frame number, respectively. The DP serves, among other things, to demodulate the dedicated control signaling and the transmitted data.

Step S209, judging whether the state is out-of-step state, if yes, entering step S203, otherwise, ending the synchronous out-of-step detection of the wireless link.

In this embodiment, when the first out-of-step frame number is greater than or equal to the first threshold, the TPC is determined to be out-of-step; when the second out-of-step frame number is greater than or equal to the second threshold, judging the CRC to be out-of-step; and when the third out-of-step frame number is greater than or equal to the third threshold, determining that the DP is out-of-step.

In this embodiment, when the TPC, the CRC, or the DP is in an out-of-synchronization state, the radio link is released, and a radio link failure procedure is triggered, where the radio link failure procedure includes executing a corresponding link out-of-synchronization process, for example, initiating a cell update procedure, and notifying a network side that the radio link is out-of-synchronization, so as to quickly release a radio link with a problem and establish a new radio link.

In this embodiment, when the TPC is in a synchronous state or both the CRC and the DP are in a synchronous state, the radio link is in a synchronous state, and the synchronous out-of-synchronization detection of the radio link is completed.

In a specific implementation, the first threshold, the second threshold, and the third threshold are set according to a signal quality of a serving cell.

In this embodiment, by adding the DP evaluation to the existing TPC and CRC out-of-sync evaluation, when the channel of the radio link changes from the DPCH configuration to the FDPCH configuration, the data transmission from the DP to the UE is not affected by the change in the channel configuration.

In specific implementation, the method for determining the out-of-synchronization state of the TPC, the CRC, or the DP may refer to fig. 3, and fig. 3 is a flowchart of the out-of-synchronization state determination method according to an embodiment of the present invention.

Referring to fig. 3 and fig. 2, the out-of-step state determination method includes: step S301, detecting the special channel of TPC to obtain the synchronization or desynchronization primitive.

In this embodiment, In the dedicated channel connection state (CELL _ DCH), the UE physical layer periodically reports In-Sync to the upper layer using a synchronization primitive (CPHY-Sync-IND) or reports Out-of-Sync to the upper layer using an Out-of-Sync primitive (CPHY-Out-of-Sync-IND).

Step S302, judging whether the TPC is out of step, if so, entering step S304, otherwise, entering step S303.

In this embodiment, the synchronization and synchronization status of the TPC is determined according to the synchronization and synchronization primitive of the TPC.

For the specific implementation, reference may be made to the foregoing embodiments, which are not described in detail herein.

In step S303, Utpc is set to 0.

In this embodiment, Utpc represents the number of frames in which the TPC is continuously out of step. And when the state of one frame of TPC is judged to be synchronous, the value of Utpc is reset to zero and counted again.

In step S304, Utpc adds 1.

In this embodiment, each time the state of one frame of TPC is determined to be out-of-sync, the value of Utpc is incremented by 1.

Step S305, judging whether Utpc is larger than or equal to Xtpc, if so, entering step S306, otherwise, entering step S307.

In this embodiment, Xtpc is a first threshold used to determine the out-of-step state, and the first threshold Xtpc is set according to the signal quality of the serving cell, and may be adaptively adjusted according to the change in the signal quality of the serving cell.

In step S306, the out-of-step state is determined.

In this embodiment, when Utpc is greater than or equal to Xtpc, it is determined that the wireless link is in an out-of-synchronization state.

Step S307, determine whether the dedicated channel of the wireless link is F-DPCH, if yes, go to step S308, otherwise go to step S309.

In step S308, it is determined as a synchronous state.

In this embodiment, when the dedicated channel of the wireless link is the F-DPCH, it indicates that there is no CRC or DP, and it is determined that the wireless link is in the synchronous state.

Step S309, judging whether the CRC is out of step, if so, entering step S311, otherwise, entering step S310.

In this embodiment, whether CRC is out of sync is determined by whether data with the correct CRC value is received within a certain time, for example, the first 160 ms.

In step S310, Ucrc is set to 0.

In this embodiment, Ucrc represents the number of frames in which CRC is continuously out of synchronization. And when the state of one CRC frame is judged to be synchronous, the value of Ucrc is reset to zero and counted again.

Step S311, Ucrc plus 1.

In this embodiment, each time the status of CRC frame is determined to be out of sync, 1 is added to the value of Ucrc.

In step S312, it is determined whether Ucrc is equal to or greater than Xcrc, and if so, the process proceeds to step S306, otherwise, the process proceeds to step S313.

In this embodiment, when Ucrc is equal to or greater than Xcrc, it is determined that the radio link is in an out-of-synchronization state.

In this embodiment, Xcrc is a second threshold, and is used to determine the out-of-synchronization state, where the second threshold Xcrc is set according to the signal quality of the serving cell, and may be adaptively adjusted according to the change of the signal quality of the serving cell.

And step 313, judging whether the DP is out of step, if so, entering step 315, and otherwise, entering step 314.

In this embodiment, whether the DP is out of synchronization is determined according to the synchronization primitive and the out-of-synchronization primitive of the DP.

In step S314, Udp is set to 0.

In this embodiment, Udp represents the number of frames in which DP continuously steps out. And when the state of one frame of the DP is judged to be synchronous, the value of the Udp is reset to zero, and counting is carried out again.

In step S315, Udp is incremented by 1.

In this embodiment, every time it is determined that the state of one frame of DP is out-of-sync, 1 is added to the value of Udp.

Step S316, judging whether Udp is larger than Xdp, if yes, entering step S306, otherwise entering step S308.

In this embodiment, when Udp is greater than or equal to Xdp, it is determined that the radio link is in an out-of-synchronization state.

In this embodiment, Xdp is a third threshold, which is used to determine step loss, and the third threshold Xdp is set according to the signal quality of the serving cell, and may be adaptively adjusted according to the change of the signal quality of the serving cell.

It can be understood that, when the signal quality of the serving cell is better, the first threshold, the second threshold and the third threshold may be set to smaller values, in which case, the probability of RLC layer packet loss is small; in a dual-card mode of sharing radio frequency resources, the setting of the first threshold, the second threshold and the third threshold can effectively cover the problem of packet loss caused by radio frequency resource conflict.

Referring to fig. 4 and fig. 2, the apparatus for detecting synchronization and synchronization loss of a wireless link includes:

the out-of-sync detection unit 401 detects the dedicated channels of TPC and CRC to obtain the synchronization or out-of-sync primitive.

The RLC status acquiring unit 402 acquires a packet loss status of the RLC layer when the synchronization primitive or the out-of-synchronization primitive does not satisfy a radio link failure criterion.

A TPC out-of-step detecting unit 403, configured to detect a dedicated channel of the TPC when the RLC layer loses packet, to obtain a first out-of-step frame number.

The CRC and DP out-of-sync detection unit 404 detects the dedicated channels of the CRC and DP to obtain a second out-of-sync frame number and a third out-of-sync frame number.

And the out-of-step comparison unit 405 compares the first out-of-step frame number with a first threshold to obtain the out-of-step synchronization state of the TPC, and compares the second out-of-step frame number and the third out-of-step frame number with a second threshold and a third threshold, respectively, to obtain the out-of-step synchronization state of the CRC and the DP.

And an out-of-synchronization determining unit 406, configured to determine that the wireless link is in an out-of-synchronization state when the TPC, the CRC, or the DP is in an out-of-synchronization state.

A triggering unit 407, coupled to the out-of-synchronization determining unit 406, adapted to release the link and trigger a radio link failure procedure.

In this embodiment, the triggering unit 407 is coupled to the RLC status acquiring unit 402, and when the in-synchronization or out-of-synchronization primitive meets a radio link failure criterion, the triggering unit 407 is entered.

In this embodiment, the triggering unit 407 releases the link and triggers a radio link failure procedure, where the radio link failure procedure includes executing a corresponding link out-of-step process, for example, initiating a cell update procedure and notifying a network side that the radio link is out-of-step, so as to quickly release a problematic radio link and establish a new radio link.

According to the embodiment of the invention, the packet loss state of the RLC layer, the TPC and the out-of-step state of the CRC physical layer are judged in a combined manner, and DP, TPC and CRC are introduced for evaluation in a matched manner, so that the accuracy of synchronous out-of-step detection of the wireless link is improved; meanwhile, under the condition that a problem occurs in the channel configuration change process, the link problem can be detected better and quickly in time, and the problem link resource is released quickly, so that better user experience is obtained.

Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for detecting synchronization and synchronization loss of a wireless link is characterized by comprising the following steps:

when the synchronization primitive or the desynchronization primitive does not meet a radio link failure criterion, acquiring a packet loss state of RLC;

when the RLC loses packets, detecting a special channel of the TPC to obtain a first out-of-step frame number;

and when the TPC, the CRC or the DP are in an out-of-step state, the wireless link is in an out-of-step state, wherein the TPC is transmission power control, the CRC is cyclic redundancy check, the RLC is a wireless link control protocol layer, and the DP is a special pilot.

2. The method of claim 1, wherein the radio link is in a synchronous state when the TPC is in a synchronous state or the CRC and the DP are both in a synchronous state.

3. The method of claim 1, wherein the first out-of-sync frame number is compared with a first threshold to obtain a second out-of-sync frame number and a third out-of-sync frame number by detecting the dedicated channels of the CRC and the DP when the TPC is in a synchronous state.

4. The method of claim 1, further comprising:

when the in-synchronization or out-of-synchronization primitive satisfies a radio link failure criterion, releasing the link and triggering a radio link failure procedure.

5. The method of claim 1, further comprising:

and when the TPC is in an out-of-step state or both the CRC and the DP are in an out-of-step state, releasing the link and triggering a radio link failure process.

6. The method of claim 1, wherein the first threshold, the second threshold, and the third threshold are set according to a signal quality of a serving cell.

7. The method of claim 1, wherein when the first out-of-sync frame number is greater than or equal to the first threshold, the TPC is determined to be out-of-sync; when the second out-of-step frame number is greater than or equal to the second threshold, judging the CRC to be out-of-step; and when the third out-of-step frame number is greater than or equal to the third threshold, determining that the DP is out-of-step.

8. A wireless link synchronization and loss of synchronization detection apparatus, comprising:

the RLC state acquisition unit acquires the packet loss state of the RLC when the synchronization primitive or the desynchronization primitive does not meet the radio link failure criterion;

a TPC step-out detection unit, which detects a special channel of the TPC when the RLC loses packets to obtain a first step-out frame number;

and an out-of-step determining unit, configured to determine that the radio link is in an out-of-step state when the TPC, the CRC, or the DP is in an out-of-step state, where the TPC is transmission power control, the CRC is cyclic redundancy check, the RLC is a radio link control protocol layer, and the DP is a dedicated pilot.

9. The apparatus of claim 8, further comprising:

10. The RLC status acquisition unit of claim 9, wherein the triggering unit is coupled to the RLC status acquisition unit, and wherein the triggering unit is entered when the in-synchronization or out-of-synchronization primitive satisfies a radio link failure criterion.