CN100397937C - Wireless link detecting method - Google Patents

Abstract

The invention discloses a wireless link detection method, which comprises the following steps: when a dedicated channel transitions from a link-building-in-progress state to a link-building-completed state, a module that knows the link-building completion sends a primitive; During the period from receiving the channel activation confirmation to the channel release confirmation, whether the signaling processing module receives the primitive, so as to determine whether the uplink and downlink directions of the dedicated channel are normal. Therefore, the wireless link detection method of the present invention can simultaneously detect whether the uplink and downlink directions of the dedicated channel are normal. The invention also discloses a wireless link detection method, comprising the following steps: setting a reference value; obtaining the level of the dedicated channel in the uplink direction and the downlink direction; calculating the level difference between the uplink direction and the downlink direction; If the absolute value of the level difference is not greater than the reference value, it means that the dedicated channel detected this time is normal. It can detect that the dedicated channel is not normal due to the imbalance in the uplink and downlink directions.

Description

Wireless Link Detection Method

technical field

The invention relates to a detection method of a wireless link in a communication system.

Background technique

In the field of communication, the way of wireless link transmission data has been widely used, such as in the Global System for Mobile Communications (GSM, Global System for Mobile Communications). The GSM system mainly includes: Mobile Station (MS, Mobile Station), Base Station Subsystem (BSS, Base StationSystem), Network and Switching Subsystem (NSS, Network and Switch System) and Operation and Maintenance Center (OMC, Operation and Maintenance Center) . in,

MS is used to receive and transmit mobile user requests and information; NSS is used to manage communication between mobile users; BSS is responsible for allocating and managing the transmission path between MS and NSS, especially the wireless link between MS and other GSM devices Road; OMC is used for configuration management and maintenance operations on the BSS.

The BSS further includes a base transceiver station (BTS, Base Transceiver Station) and a base station controller (BSC, Base Station Controller). in,

BTS is a wireless transceiver device serving a certain cell, and is used to establish a connection with MS through a wireless link; BSC is responsible for wireless network management, wireless resource management, and monitoring and management of wireless base stations, and controls the wireless link between MS and BTS Establishment, connection and dismantling management, control and complete MS handover, transmission and call.

The information transmission process of GSM is as follows:

Step 10) MS sends access request to BTS through common channel;

Step 11) After the BTS receives the access request in the uplink direction of the public channel, it further sends the information to the BSC;

Step 12) After the BCS sends the access request according to the BTS, it allocates a dedicated channel for this communication and sends the allocated dedicated channel information to the MS through the BTS;

Step 13) The BTS notifies the MS of the dedicated channel information allocated by the BSC for this communication through the downlink direction of the common channel;

Step 14) The MS receives the dedicated channel information allocated for this communication in the downlink direction of the common channel;

Step 15) The MS can perform call signaling interaction through the dedicated channel.

It can be seen from the above that the wireless link of the GSM system is divided into public channels and dedicated channels according to functions. The dedicated channels are used for the interaction of actual call signaling; the public channels are used to transmit information before the actual call signaling. Whether it is a common channel or a dedicated channel, there are two directions. One is the channel in the downlink direction, such as the channel for BTS to send information to the MS; the other is the channel for the uplink direction, that is, the channel for MS to send information to the BTS.

The quality of the wireless link directly affects the service capability and performance of GSM, so an effective wireless link detection method is very necessary for timely discovery of system problems and improvement of system maintainability.

The existing wireless link detection method is to send a signal on the BTS side, measure the actual output value of the transmitted signal, and compare the actual output value with the expected output value. If the comparison results are equal, it means normal, otherwise it means abnormal. Since the prior art uses the BTS side to send signals, it can only detect whether the wireless link is normal in the downlink direction.

Since there is no comparison reference value in the uplink direction, that is, after the BTS receives the signal sent by the MS, it cannot know the size of the signal that the MS expects to send, so it cannot detect whether the wireless link in the uplink direction is normal, that is, the existing technology can only detect Whether the outbound dedicated channel or public channel is normal in the downlink direction.

Only when the dedicated channel is normal in the downlink direction and also normal in the uplink direction can it be indicated that the dedicated channel is normal. The prior art cannot detect whether the uplink direction is normal, that is, the detection of whether the dedicated channel is normal cannot be realized. Similarly, it is also impossible to detect whether the public channel is normal.

Even if the existing technology can realize the detection of the uplink direction of the dedicated channel, but to determine whether the dedicated channel is normal, it is necessary to separately detect whether the uplink and downlink directions are normal. By considering the detection results of the uplink direction and the detection results of the downlink direction, and then judge and draw a conclusion, it cannot be based on One detection result simultaneously detects whether the uplink and downlink directions are normal, that is, determines whether the dedicated channel is normal according to one detection result.

Contents of the invention

The problem to be solved by the present invention is to provide a wireless link detection method capable of simultaneously detecting whether the wireless link in the uplink and downlink directions of the dedicated channel is normal.

In order to solve the above problems, the technical solution of the wireless link detection method of the present invention:

A wireless link detection method is characterized in that, comprising the following steps:

When the dedicated channel transitions from the link-building-in-progress state to the link-building-completed state, the module that knows the link-building completion sends primitives;

Detect whether the signaling processing module receives the primitive during the period from receiving the channel activation acknowledgment to the channel release acknowledgment on the dedicated channel, so as to determine whether the uplink and downlink directions of the dedicated channel are normal.

The wireless link detection method of the present invention also includes the following steps:

Set the value of the detection base, abnormal threshold and recovery threshold, where,

The detection base is used to represent the number of detections,

The abnormal threshold is used to indicate the lowest limit value of the ratio of abnormality after the detection base number of detections, and if the ratio exceeds the lowest limit value, it means that the dedicated channel is abnormal,

The recovery threshold is used to indicate the highest value to which the abnormality ratio drops after an abnormality occurs, and if the abnormality ratio drops to the highest value, it means that the dedicated channel abnormality disappears;

After the number of times of detection by the detection base, count the abnormal ratio of the dedicated channel;

When the ratio reaches the value of the abnormal threshold, alarm processing is triggered and fault self-repair processing is performed;

After the alarm processing has been triggered, after a certain period of time, the abnormal rate of the dedicated channel is counted again;

When the ratio of the abnormality of the dedicated channel drops to the value of the recovery threshold, alarm disappearance processing is triggered.

The wireless link detection method of the present invention also includes the following steps:

making statistics on the random access and handover access of the common channel;

If there is random access, it means that the uplink and downlink directions of the common channel are normal;

If there is only handover access but no random access, it means that the common channel is abnormal in the uplink direction but normal in the downlink direction;

If there is neither handover access nor random access, it indicates that the downlink direction of the common channel is abnormal.

The present invention also provides a wireless link detection method, comprising the following steps:

set benchmarks;

Obtain the level of the uplink direction and downlink direction of the dedicated channel;

Calculate the level difference between the uplink direction and the downlink direction;

The fact that the absolute value of the level difference is not greater than the reference value indicates that the dedicated channel detected this time is normal.

The wireless link detection method of the present invention also includes the following steps:

Set the value of the alarm threshold and recovery threshold, where,

The alarm threshold is used to indicate the lowest limit of the ratio of abnormalities within a predetermined period of time, and if the ratio reaches the lowest limit, it means that the dedicated channel is abnormal;

Statistical detection of the number of abnormal occurrences of the dedicated channel;

Calculate the abnormal rate of the dedicated channel;

When the ratio reaches the alarm threshold, alarm processing is triggered;

After the alarm processing has been triggered, count and calculate the abnormal ratio of the dedicated channel again at intervals of time;

When the ratio drops to the recovery threshold, the alarm disappears processing will be triggered

The wireless link detection method of the present invention also includes the following steps:

making statistics on the random access and handover access of the common channel;

If there is random access, it means that the uplink and downlink directions of the common channel are normal;

If there is only handover access but no random access, it means that the common channel is abnormal in the uplink direction but normal in the downlink direction;

If there is neither handover access nor random access, it indicates that the downlink direction of the common channel is abnormal.

Compared with the prior art, the beneficial effects of the wireless link detection method of the present invention:

The technical solution of the wireless link detection method of the present invention is to send primitives when the dedicated channel transitions from the link-building-in-progress state to the link-building-completed state, and during the period from receiving the channel activation confirmation to the channel release confirmation of the dedicated channel, Detect if said primitive was received. If the primitive is received, it means that the dedicated channel detected this time is normal; otherwise, it means that the dedicated channel detected this time is abnormal. It can detect whether the uplink and downlink of dedicated channels are normal.

Another wireless link detection method provided by the present invention judges that the dedicated channel is abnormal due to the imbalance in the uplink and downlink directions by counting and calculating the level difference between the uplink and downlink directions of the dedicated channel.

Finally, the wireless link detection method of the present invention judges whether the public channel is normal in the uplink and downlink directions by counting the times of switching access and random access on the public channel, and by analyzing whether there is a message of switching access and random access .

Description of drawings

Fig. 1 is the information transmission flowchart of GSM;

Fig. 2 is a flow chart of the wireless link detection method of the present invention;

Fig. 3 is the flow chart of the further improvement of detection dedicated channel normal situation;

Fig. 4 is the flow chart that detects common channel normal situation;

Fig. 5 is a flow chart of detecting dedicated channels due to unbalanced uplink and downlink directions;

Fig. 6 is the process of further improving the detection of dedicated channels due to imbalance in the uplink and downlink directions;

Fig. 7 is a detection schematic diagram of an embodiment of a wireless link detection method of the present invention;

Fig. 8 is a schematic diagram of occurrences of an embodiment of a wireless link detection method of the present invention.

Detailed ways

As shown in Figure 2, the wireless link detection method of the present invention includes the following steps:

Step 20) When the dedicated channel transitions from the link-building-in-progress state to the link-building-completed state, send primitives;

Step 21) Detect whether the primitive is received during the period from receiving channel activation acknowledgment to channel release acknowledgment on the dedicated channel;

If the primitive is received, it means that the dedicated channel detected this time is normal; otherwise, it means that the dedicated channel detected this time is abnormal.

The state of link establishment in progress refers to the period from the start of link establishment to the completion of link establishment after the dedicated channel has been activated; the state of completion of link establishment refers to the actual interaction of call signaling between mobile devices. When the state transitions from the state of link building in progress to the state of link building completion, it means that the link building has been completed. Since the process of link building requires interaction between the two parties, that is to say, the link building primitives transmitted in the downlink direction have been received, and the chain building primitives transmitted in the uplink direction have been received. The transmitted link establishment acknowledgment primitive has also been received, indicating that the link establishment was successfully completed. Since the link establishment primitive transmitted in the downlink direction has been received, it indicates that the downlink direction is normal; the link establishment confirmation primitive transmitted in the uplink direction is received, indicating that the uplink direction is normal, so the primitive is sent when the link establishment has been completed. During the period from receiving the channel activation confirmation to the channel release confirmation, check whether the primitive is received. If the primitive is received, it indicates that the link establishment is successfully completed and both the uplink and downlink directions are normal. Otherwise, it indicates that the link establishment is not successful. Completed successfully, i.e. there was an exception in at least one direction.

It is unreasonable to conclude whether the dedicated channel is normal through one detection. Maybe the dedicated channel is abnormal during the detection alone, but it is normal at other times. Therefore, it is possible to set a detection number and count the abnormalities within the detection number. situation to judge. Therefore, further, the wireless link detection method of the present invention measures whether the dedicated channel is normal through the detection base, threshold and recovery threshold, wherein,

The detection base is used to represent the number of detections;

The abnormality threshold is used to indicate the lowest limit value of the ratio of abnormality after the detection base number of detections, and if the ratio exceeds the lowest limit value, it means that the dedicated channel is abnormal;

The recovery threshold is used to indicate the highest value to which the abnormality ratio drops after an abnormality occurs, and if the abnormality ratio drops to the highest value, it means that the dedicated channel abnormality disappears;

As shown in Figure 3, the wireless link detection method also includes the following steps:

Step 30) setting the values of detection base, abnormal threshold and recovery threshold;

Step 31) after the detection base number of detections, count the abnormal ratio of the dedicated channel;

Step 32) judging whether the ratio reaches the value of the abnormal threshold;

If the value of the abnormal threshold is not reached, it means that the dedicated channel is normal, otherwise the following steps are performed,

Step 33) triggering alarm processing and performing fault self-repair processing;

Step 34) After the alarm processing has been triggered, count again the abnormal rate of the dedicated channel at intervals;

Step 35) judging whether the ratio drops to the value of the recovery threshold;

If the judgment result is affirmative, then execute step 36) to trigger the alarm disappear processing;

If the judgment result is negative, repeat step 34).

For a dedicated channel, if the levels in the uplink and downlink directions are unbalanced, the dedicated channel will also be abnormal. The abnormal detection method for the dedicated channel caused by this reason is shown in Figure 5. The wireless link detection method Also includes the following steps:

Step 50) setting a reference value, which is used to measure whether the dedicated channel is normal;

Step 51) Obtain the level of the dedicated channel in the uplink direction and downlink direction;

Step 52) Calculate the level difference between the uplink direction and the downlink direction;

Step 53) judging whether the absolute value of the level difference is greater than a reference value;

If the judgment result is affirmative, it means that the dedicated channel in this detection is abnormal;

If the judgment result is negative, it means that the dedicated channel detected this time is normal.

In the same way, it is not reasonable to judge whether the dedicated channel is normal through only one detection. Therefore, further, through the alarm threshold and recovery threshold, it is also determined whether to trigger alarm processing and alarm disappearance processing. Among them,

The alarm threshold is used to indicate the lowest limit value of the abnormality ratio within a predetermined period of time, and if the ratio reaches the lowest limit value, it means that the dedicated channel is abnormal;

As shown in Figure 6, the wireless link detection method also includes the following steps:

Step 60) setting the value of alarm threshold and recovery threshold;

Step 61) Statistically detect the number of times that the dedicated channel is abnormal;

Step 62) Calculate the abnormal ratio of the dedicated channel;

Step 63) judging whether the ratio reaches the alarm threshold;

If the alarm threshold is not reached, it means that the dedicated channel is normal; otherwise, the following steps are performed,

Step 64) trigger alarm processing;

Step 65) at intervals, count and calculate again the abnormal ratio of the dedicated channel;

Step 66) judging whether the ratio falls to the recovery threshold;

If the judgment result is negative, execute step 65), otherwise execute step 67) to trigger the alarm disappearing process.

Furthermore, the wireless link detection method of the present invention can also be used to detect whether the common channel is normal. As shown in Figure 4, the wireless link detection method also includes the following steps:

Step 40) Statistical random access and handover access of the common channel;

Step 41) judging the situation of random access and handover access,

If there is random access, it means that the common channel is normal in the uplink and downlink directions;

If there is only handover access but no random access, it means that the uplink direction of the common channel is abnormal but the downlink direction is normal;

If there is neither random cut-in nor random access, it indicates that the downlink direction of the common channel is abnormal.

For public channels, if the uplink direction is abnormal, the public channel will not have random access; if the downlink direction is abnormal, the public channel will not have handover access, and there will be no random access; only when the uplink and downlink directions are normal can there be random access. enter.

The radio link detection between the BTS and the MS in GSM is taken as an example below for illustration.

In GSM, BSC is used to establish, connect, release and manage wireless links. This example is used to detect the dedicated channel of the link access procedure (LAPDm, Link Access Procedure on the Dm channel) layer. As shown in Figure 7, the specific process is as follows:

The BSC sends a channel activation request to the signaling processing module of the BTS;

After receiving the channel activation request, the signaling processing module sends a channel activation confirmation to the BSC;

In this way the dedicated channel between the BTS and the MS is activated.

After the dedicated channel is activated, perform the following steps:

The MS sends a link establishment primitive (such as SABME) to the LAPDm layer module of the LAPDm layer wireless link;

The LAPDm layer module sends an acknowledgment primitive (such as: UA) to the MS;

The MS sends a connection primitive (such as: I) to the LAPDm layer module;

When the wireless link at the LAPDm layer transitions from the state of establishing the link (that is, the sending of the link building primitive SABME) to the state of establishing the link (that is, entering the call signaling process), the LAPDm layer module sends a primitive to the signaling processing module (eg: LAPDm Est Done);

Enter the call signaling process, that is, perform signaling interaction;

After the signaling interaction ends, the BSC sends a channel release primitive (such as RF ChannelRelease) to the signaling processing module;

The signaling processing module sends a channel release confirmation primitive (such as: RF Channel Rel Ack) to the BSC.

The dedicated channel established so far is released.

During the period from receiving the channel activation confirmation to receiving the channel release confirmation, the signaling processing module detects whether it has received the LAPDm layer wireless link from the link establishment in progress state to the link establishment completion state, and the LAPDm layer module sends a message to it. If the original language sent (such as: LAPDm Est Done) is received, it means that the uplink and downlink directions of the dedicated channel are normal during this detection, otherwise it means that the dedicated channel is abnormal.

The state of link building in progress means that the MS sends a SABME to the LAPDm layer module until the LAPDm layer module receives the I sent by the mobile device (link building is completed). The link establishment completion status means that the link establishment has been successfully completed, and the call signaling interaction process is started.

If the uplink direction is abnormal but the downlink direction is normal, after the dedicated channel is activated, the LAPDm layer module cannot receive the SABME, and the link establishment cannot be completed, so after a period of time, the BSC will send a channel release request, and the LAPDm layer module will send a channel release confirmation;

If the downlink direction is abnormal but the uplink direction is normal, after the dedicated channel is activated, the LAPDm layer module receives the SABME, and the LAPDm layer module receives the SABME and sends a UA to the MS. The MS cannot receive the UA in the downlink direction, so that the link establishment cannot be successful. Complete, so after a period of time the BSC will send a channel release request;

If both the uplink and downlink directions are abnormal, the link establishment cannot be successfully completed, so after a period of time, the BSC will send a channel release request.

From the above, it can be seen that since the link building cannot be successfully completed, the primitive sent when the link building is in progress (that is, the sending of the chain building primitive SABME) is switched to the link building completion state (that is, entering the call signaling process) is sent on the channel The BTS will not receive this primitive during the period from Activation Confirmation to Channel Release Confirmation.

If this primitive is received, it means that both the uplink and downlink directions are normal, otherwise it means that at least one direction is abnormal.

As shown in Figure 8, the LAPDm layer module did not receive the link establishment primitive (SABME) sent by the MS, and the signaling processing module did not receive the primitive sent by the LAPDm layer module, indicating that the link was not established successfully, let alone The actual signaling interaction is over.

The setting of the detection base, abnormal threshold and recovery threshold shall be determined according to the current cell traffic situation. For a cell with a relatively large traffic volume, the detection base can be configured larger, and the abnormality threshold and recovery threshold can be configured smaller, for example: the detection base is 20, the abnormality threshold is 60% and the recovery threshold is 40%; For smaller cells, the detection base can be configured smaller, while the abnormal threshold and recovery threshold can be configured larger, for example: the detection base is 10, the abnormal threshold is 80%, and the recovery threshold is 50%.

In order to prevent the wireless link status from repeatedly oscillating between normal and normal, the value of the recovery threshold should be lower than the value of the abnormal threshold.

In this example, the detection base is set to 40, the abnormal threshold is 60%, and the recovery threshold is 40%, and the occurrence of dedicated channels is counted in units of time slots. For example, a time slot is configured as a half-rate traffic channel type, so there are two half-rate physical channels in this time slot for communication on a dedicated channel. When the sum of the number of channel detection times) reaches 20×2, that is, 40, it means that the detection times have reached the detection base of 40. At this time, it can be counted whether the dedicated channel is normal.

The channel occupancy occurring on this time slot is numbered 1, 2, and 3 sequentially in chronological order. . . 40, 41, 42, when the channel occupancy has accumulated to the 40th time, the detection base has been reached, and the statistical number is 1 to 40, a total of 40 channel occupancy abnormalities; the next channel occupancy occurs, and the number is 41 , at this time, statistics will be made of the occurrences of 40 channel occupations from 2 to 41; another channel occupation occurs, numbered 42, and the abnormal ratio of 40 channel occupations from 3 to 42 will be counted at this time; and so on. If the half-rate physical channel of the time slot is continuously occupied, only the latest 40 channel occupations are counted each time, which is equivalent to a detection window that is constantly moving forward to ensure that the statistical information reflects the latest status. For example, if the detected dedicated channels: 1~8, 9~20 are normal, 21~35, 36~39 are normal, 40, at this time, the total 40 detections of 1~40 are counted as (8+15+1)/ 40 is equal to 60%, and when the value of the abnormal threshold is reached, the alarm process will be triggered and the fault self-repair process will be carried out; the next 7 channel occupations 41 to 47 are normal, and the 47th time the statistics are 8 to 47, a total of 40 channel occupations are in progress The ratio of abnormality is (1+15+1)/40 equal to 42.5%, if the recovery threshold of 40% is not reached, no further processing will be done; once again, channel occupation of 48 is considered normal, at this time, a total of 40 occupational abnormalities from 9 to 48 will be counted The ratio of (15+1)/40 is equal to 40%, and when the recovery threshold of 40% is reached, the alarm disappearing process is triggered.

For the dedicated channel of the wireless link, if the level of the uplink direction and the downlink direction are unbalanced, that is, there is a large difference between the uplink and downlink coverage areas, a large number of calls will be abnormal, and only some calls will be normal. The detection method for the abnormality of the dedicated channel caused by this reason is shown in FIG. 5 .

In this example, first set a benchmark value, which is 30dbm;

Extracting the uplink direction and the level of the uplink direction of the dedicated channel from the measurement report reported by the BTS to the BSC;

Calculate the level difference between the uplink direction and the downlink direction;

If the absolute value of the level difference is within the reference value, ie, 30dbm, it indicates normal, otherwise it indicates abnormal.

When calculating the absolute value of the difference between the uplink and downlink levels, it is necessary to compensate for the effect of power control, and adjust the uplink and downlink comparison benchmarks to 0 power level, for example: the uplink level is -60dbm, and the MS power level is level 4 , the level in the downlink direction is -70dbm, and the BTS power level is level 3, then the judgment level in the uplink direction is -60+2×4 equal to -52dbm, the judgment level in the downlink direction is -70+2×3 equal to -64dbm, up and down The level difference in the row direction is -64-(-52) or -12dbm, which means that the downlink is weaker than the downlink by 12dbm, and 12dbm is less than 30dbm, so this test is within the effective range of uplink and downlink balance, and the test result is normal.

The setting of the alarm threshold and the recovery threshold should be determined according to the current traffic volume of the cell. In this example, the alarm threshold and the recovery threshold are set to 80% and 50% respectively.

Since the level balance in the uplink and downlink directions is for the entire carrier frequency and does not distinguish between time slots and channels, each measurement report reported for this carrier frequency is analyzed. In this example, 0:00 every night is used for a The level data accumulated in the uplink and downlink directions throughout the day is counted, and the ratio is checked. If it reaches 80% of the set alarm threshold, alarm processing will be triggered. Moreover, once the alarm occurs, the level imbalance in the uplink and downlink directions will be counted again every hour. If the ratio drops to 50% of the recovery threshold, the alarm disappearing process will be triggered; otherwise, no further processing will be performed.

For the common channel of the wireless link, if the BTS can successfully receive the random access message reported by the MS, it indicates that the uplink and downlink directions of the common channel are normal; If there is no random access message, it indicates that the uplink direction of the public channel is abnormal and the downlink direction is normal; if there is neither a switch access message nor a random access message within a period of time, it indicates that the uplink and downlink of the public channel The directions are abnormal. According to this principle, the process shown in Figure 4 is used to detect the common channel. In a period of time, a conclusion can be drawn by counting the times of handover access and random access. The selection of the specific detection time period (including: detection start time and termination time, and the length of the detection time period) needs to comprehensively consider the general traffic situation of the current cell and the user's living habits. For example: in the middle of the night, the traffic will be very small, so this period of time is generally not used as a detection period. Selecting time periods with heavy traffic for statistics can better reflect the real situation of public channels.

To sum up, the radio link detection method of the present invention can simultaneously detect whether the dedicated channel is normal or not, and can also detect whether the common channel is normal.

The above is only a preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the principle of the wireless link detection method of the present invention. These improvements and modifications should also be regarded as the scope of protection of the wireless link detection method of the present invention.

Claims (6)

1. a wireless link detection method, is characterized in that, comprises the following steps: When the dedicated channel transitions from the link-building in-progress state to the link-building complete state, the module that knows the link-building completion sends primitives; Detect whether the signaling processing module receives the primitive during the period from receiving the channel activation acknowledgment to the channel release acknowledgment on the dedicated channel, so as to determine whether the uplink and downlink directions of the dedicated channel are normal. 2. The radio link detection method according to claim 1, further comprising the steps of: Set the value of the detection base, abnormal threshold and recovery threshold, where, The detection base is used to represent the number of detections, The abnormal threshold is used to indicate the lowest limit value of the ratio of abnormality after the detection base number of detections, and if the ratio exceeds the lowest limit value, it means that the dedicated channel is abnormal, The recovery threshold is used to indicate the highest value to which the abnormality ratio drops after an abnormality occurs, and if the abnormality ratio drops to the highest value, it means that the dedicated channel abnormality disappears; After the number of times of detection by the detection base, count the abnormal ratio of the dedicated channel; When the ratio reaches the value of the abnormal threshold, alarm processing is triggered and fault self-repair processing is performed; After the alarm processing has been triggered, after a certain period of time, the abnormal rate of the dedicated channel is counted again; When the ratio of the abnormality of the dedicated channel drops to the value of the recovery threshold, alarm disappearance processing is triggered. 3. The radio link detection method according to claim 1 or 2, further comprising the steps of: Statistical random access and handover access of common channels; If there is random access, it means that the uplink and downlink directions of the common channel are normal; If there is only handover access but no random access, it means that the common channel is abnormal in the uplink direction but normal in the downlink direction; If there is neither handover access nor random access, it indicates that the downlink direction of the common channel is abnormal. 4. A wireless link detection method, is characterized in that, comprises the following steps: set benchmarks; Obtain the level of the uplink direction and downlink direction of the dedicated channel; Calculate the level difference between the uplink direction and the downlink direction; The fact that the absolute value of the level difference is not greater than the reference value indicates that the dedicated channel detected this time is normal. 5. The radio link detection method according to claim 4, further comprising the steps of: Set the value of the alarm threshold and recovery threshold, where, The alarm threshold is used to indicate the lowest limit of the ratio of abnormalities within a predetermined period of time, and if the ratio reaches the lowest limit, it means that the dedicated channel is abnormal; Statistical detection of the number of abnormal occurrences of the dedicated channel; Calculate the abnormal rate of the dedicated channel; When the ratio reaches the alarm threshold, alarm processing is triggered; After the alarm processing has been triggered, count and calculate the abnormal ratio of the dedicated channel again at intervals of time; When the ratio falls to the recovery threshold, alarm disappearance processing is triggered. 6. The radio link detection method according to claim 4 or 5, further comprising the steps of: Statistical random access and handover access of common channels; If there is random access, it means that the uplink and downlink directions of the common channel are normal; If there is only handover access but no random access, it means that the common channel is abnormal in the uplink direction but normal in the downlink direction; If there is neither handover access nor random access, it indicates that the downlink direction of the common channel is abnormal.

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