CN102523595B - Method and device for detecting center of reverse search window in cluster system - Google Patents

Abstract

The invention discloses a method and device for detecting the center of a reverse search window in a trunking system. The method includes: demodulating after obtaining a calling message sent by a terminal, obtaining the first EPN value reported periodically according to an EPN callback function; traversing Historical search data, the minimum value of the EPN obtained in the locked state is the second EPN value; when establishing the reverse traffic channel, determine the center of the reverse search window according to the EPN information carried by the upper layer service layer, wherein the reverse search window The size of the center is equal to the sum of the smaller of the first EPN value and the second EPN value and the reverse distribution time delay. In the present invention, the first EPN value is obtained through the EPN callback function and the second EPN value is obtained by searching the search data, and the smaller EPN value of the two is used as the effective EPN. The demodulation terminal can be accurately searched for the traffic channel, avoiding the situation that the terminal near the base station cannot be searched because the EPN is too large, and the call success rate is improved.

Description

Method and device for detecting center of reverse search window in cluster system

technical field

The present invention relates to the field of mobile communications, in particular to a method and device for detecting the center of a reverse search window in a GOTA (Global OpenTrunking Architecture, open trunking architecture) trunking system.

Background technique

GOTA is a new generation digital trunking communication system developed based on CDMA2000. GOTA supports the 500 millisecond fast access requirement, that is, the time interval from the start of a button call to the time when the caller can talk is within 500 milliseconds. Due to the fast access and stable performance of GOTA, it has been applied in many fields such as ports, hospitals, hotels, and security. As GOTA becomes the national standard of my country's digital trunking communication industry, it will be used in the future More fields are more widely used.

Since it takes a long time to search and demodulate call messages on ordinary access channels, it is difficult to meet the fast access requirements of the trunking system. Therefore, the GOTA trunking system introduces the function of searching and demodulating call messages on traffic channels. This service channel is similar to a common access channel, and it will always exist after the configuration is successful, and will not be deleted due to call release. The time for the traffic channel to demodulate the reverse traffic frame is relatively short, so that the requirement of fast access can be met. Since the traffic channel is shared by all GOTA terminals under the cell, the traffic channel is called a shared traffic channel here. The shared service channel continuously searches for call-out messages under its coverage. When a call-out message is found, it will report the call-out message to the upper layer service for processing, wherein the call-out message carries the demodulated call-out message of the terminal. The EPN value corresponding to the call message. Then the system will allocate a dedicated traffic channel for the call for voice calls. The dedicated traffic channel needs to use the EPN value reported by the shared traffic channel, and set the search window center of the dedicated traffic channel to the chip according to the EPN value, so that the dedicated traffic channel searches for voice and other service frames of the demodulation terminal near the center of the search window.

Wherein, the so-called center of the search window is the starting position where the chip first searches for the demodulation terminal. The chip uses a certain search window width as its diameter, and searches and demodulates the terminal near the center of the search window. And if the center of the search window deviates too much from the actual position of the demodulation terminal, the terminal cannot be searched and the call fails. In the prior art, due to the poor accuracy of the EPN reported by the system, the center of the search window is set too large, resulting in call failure and reducing the call success rate.

Contents of the invention

In view of the situation that the center of the service channel search window deviates too far from the actual distance of the terminal due to the inaccurate EPN reporting in the above-mentioned trunking call, which easily leads to call failure, the purpose of the present invention is to provide a reverse search window center in the trunking system. The detection method and device can greatly improve the call success rate.

In order to achieve the purpose of the present invention, the present invention adopts the following technical solutions to realize:

A method for detecting the center of a reverse search window in a cluster system, comprising:

Demodulate after obtaining the calling message sent by the terminal, and obtain the first EPN value reported periodically according to the EPN callback function;

Traverse the historical search data, and obtain the minimum value of the EPN in the locked state as the second EPN value;

Report the smaller value of the first EPN value and the second EPN value to the upper service layer, and determine the center of the reverse search window according to the EPN information carried by the upper service layer when establishing the reverse service channel, wherein the reverse The size toward the center of the search window is equal to the sum of the smaller of the first EPN value and the second EPN value and the reverse distribution time delay.

Preferably, the call initiation message sent by the terminal is acquired on the reverse access channel.

Preferably, the calling message sent by the terminal is acquired on the traffic channel.

Preferably, the EPN callback function is registered when the service channel is established.

Preferably, when traversing historical search data, it is judged whether the EPN value is in a locked state according to a preset lock times threshold value, and when the lock times of the EPN value exceeds the lock times threshold value, it is judged that the EPN value is in the locked state. In the locked state, otherwise, it is in the unlocked state; obtain the minimum value of the EPN in the locked state as the second EPN value.

Preferably, the detection method of the reverse search window center in the cluster system also includes:

According to the center of the search window and the preset search window width, the demodulation terminal is searched near the center of the search window.

A device for detecting the center of a reverse search window in a cluster system, comprising:

The first EPN value obtaining device is used to obtain the call-up message sent by the terminal and demodulate it, and obtain the first EPN value reported periodically according to the EPN callback function;

The second EPN value acquisition device is used to traverse the historical search data, and acquire the minimum value of the EPN in the locked state as the second EPN value;

Reverse search window center acquisition means, used to determine the reverse search window center according to the EPN information carried by the upper layer service layer when establishing the reverse traffic channel, wherein the EPN information carried by the upper layer service layer is the first EPN value and The smaller value of the second EPN value, the size of the center of the reverse search window is equal to the sum of the smaller one of the first EPN value and the second EPN value and the reverse distribution time delay.

Preferably, the first EPN value obtaining means obtains a call-up message sent by the terminal on a reverse access channel.

Preferably, the first EPN value obtaining means obtains the calling message sent by the terminal on the traffic channel.

Preferably, the EPN callback function is registered when the service channel is established.

Preferably, the second EPN value obtaining means judges whether the EPN value is in a locked state according to a preset lock times threshold value when traversing historical search data, when the lock times of the EPN value exceeds the lock times threshold value, it is judged that the EPN value is in the locked state, otherwise, it is in the unlocked state; the minimum value of the obtained EPN in the locked state is the second EPN value.

Preferably, the detection device for the center of the reverse search window in the cluster system further includes:

The demodulation terminal search device is used to search for demodulation terminals near the search window center according to the search window center and the preset search window width.

As can be seen from the above technical solutions of the present invention, the detection method and device for the center of the search window in the cluster system provided by the present invention obtain the EPN value through the EPN callback function and the EPN value obtained by searching the historical search data Finger, and take the comparison between the two. A small EPN value is used as the effective EPN. Such processing enables the service channel to accurately search for the demodulation terminal, avoids the situation that the terminal near the base station cannot be searched due to too large EPN, and greatly improves the call success rate.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is a schematic flow chart of a detection method for the center of a search window in a cluster system provided by the present invention;

FIG. 2 is a schematic structural diagram of a detection device for the center of the search window in the cluster system provided by the present invention;

FIG. 3 is a schematic flowchart of a detailed detection method for a search window center in a cluster system provided by an embodiment of the present invention.

detailed description

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The present invention obtains the EPN value through the EPN callback function and finds out the minimum value of the EPN under the locking condition through the convenient search data Finger, and takes the smaller value between the two as the effective EPN. This method can avoid the call failure caused by the reported EPN being too large, and greatly improve the call success rate.

Specifically, as shown in Figure 1, a method for detecting the center of a reverse search window in a cluster system provided by the present invention includes the following steps:

S101. Demodulate after obtaining the calling message sent by the terminal, and obtain the first EPN value reported periodically according to the EPN callback function;

S102. Traverse the historical search data, and obtain the minimum value of the EPN in the locked state as the second EPN value;

S103. Report the smaller value of the first EPN value and the second EPN value to the upper service layer, and determine the center of the reverse search window according to the EPN information carried by the upper service layer when establishing the reverse service channel, wherein the The size of the center of the reverse search window is equal to the sum of the smaller of the first EPN value and the second EPN value and the reverse distribution time delay.

In a preferred implementation manner, in the step S101, the base station system obtains the call initiation message sent by the terminal on the reverse access channel, and after demodulating the call initiation message, obtains the periodically reported first call message according to the EPN callback function. an EPN value.

In another preferred implementation manner, in the step S101, the base station system obtains the call initiation message sent by the terminal on the traffic channel, and after demodulating the call initiation message, obtains the periodically reported first call message according to the EPN callback function. EPN value. In this embodiment, the EPN callback function is registered when the service channel is established.

In a preferred embodiment, in the step S102, when traversing the historical search data, judge whether the EPN value is in the locked state according to the preset lock times threshold value, when the lock times of the EPN value exceeds the lock times threshold When the limit value is reached, it is judged that the EPN value is in the locked state, otherwise, it is in the unlocked state; the minimum value of the EPN obtained in the locked state is the second EPN value. Wherein, the search data appears in the form of an array, for example, the search data Finger corresponds to a two-dimensional array, various search algorithms can be used when facilitating the search data Finger, and the search data Finger is in a locked state And in the data whose locking times reach a certain threshold value, find out the corresponding minimum value of EPN as the second EPN value EPN_B. In this step, it is necessary to select an appropriate threshold value of the number of locks as the basis for judging whether the EPN value is in the locked state. If the threshold value of the number of locks selected is too large, it may cause the number of locks to fail to reach the threshold. If the corresponding EPN value cannot be found, if the selected lock times threshold value is too small, the EPN value that is actually not in the locked state may be mistaken for a valid EPN value.

In step S103, it is necessary to select a smaller EPN value from the first EPN value obtained in step S101 and step S102 and the second EPN value as an effective EPN, and when the traffic channel is established, set the corresponding EPN accurately according to the EPN value. The center of the search window ensures that the service channel can search for the corresponding demodulation terminal, and avoids the situation that the corresponding demodulation terminal cannot be found when the EPN is too large.

As shown in Figure 1, the detection method of the center of the reverse search window in the cluster system also includes:

S104. Search for demodulation terminals near the center of the search window according to the search window center and the preset search window width.

In the detection method of the search window center in the cluster system provided by the present invention, the EPN value is obtained through the EPN callback function and the search data Finger is used to obtain the EPN value, and the smaller EPN value between the two is used as the effective EPN. Such processing enables the service channel to accurately search for the demodulation terminal, avoids the situation that the terminal near the base station cannot be searched due to too large EPN, and greatly improves the call success rate.

With reference to Fig. 2, the present invention also provides a kind of detecting device of reverse search window center in the cluster system, described device comprises:

The first EPN value obtaining device 10 is used to obtain the demodulation after the calling message sent by the terminal, and obtain the first EPN value reported periodically according to the EPN callback function;

The second EPN value obtaining means 20 is used to traverse the historical search data, and obtain the minimum value of the EPN in the locked state as the second EPN value;

The reverse search window center acquisition device 30 is used to determine the reverse search window center according to the EPN information carried by the upper layer service layer when establishing the reverse traffic channel, wherein the EPN information carried by the upper layer service layer is the first EPN value and the smaller value of the second EPN value, the size of the center of the reverse search window is equal to the sum of the smaller one of the first EPN value and the second EPN value and the reverse distribution time delay.

In a preferred implementation manner, the first EPN value obtaining device 10 obtains the call-up message sent by the terminal on the reverse access channel, and after demodulating the call-up message, obtains the first EPN value reported periodically according to the EPN callback function. an EPN value.

In another preferred implementation manner, the first EPN value obtaining means 10 obtains a call-up message sent by a terminal on a traffic channel. , and after demodulating the calling message, obtain the first EPN value reported periodically according to the EPN callback function. In this embodiment, the EPN callback function is registered when the service channel is established.

In a preferred embodiment, when the second EPN value acquisition device 20 traverses historical search data, it judges whether the EPN value is in a locked state according to a preset lock times threshold value. When the lock times of the EPN value exceed the locked When the times threshold value is determined, it is judged that the EPN value is in the locked state, otherwise, it is in the unlocked state; the minimum value of the EPN obtained in the locked state is the second EPN value.

Wherein, the search data appears in the form of an array, for example, the search data Finger corresponds to a two-dimensional array, various search algorithms can be used when facilitating the search data Finger, and the search data Finger is in a locked state And in the data whose locking times reach a certain threshold value, find out the corresponding minimum value of EPN as the second EPN value EPN_B. In this step, it is necessary to select an appropriate threshold value of the number of locks as the basis for judging whether the EPN value is in the locked state. If the threshold value of the number of locks selected is too large, it may cause the number of locks to fail to reach the threshold. If the corresponding EPN value cannot be found, if the selected lock times threshold value is too small, the EPN value that is actually not in the locked state may be mistaken for a valid EPN value.

Continue to refer to Fig. 2, the detection device of reverse search window center in described cluster system also includes:

The demodulation terminal search device 40 is configured to search for demodulation terminals near the center of the search window according to the center of the search window and a preset search window width.

The detection device for the center of the search window in the cluster system provided by the present invention obtains the EPN value through the EPN callback function and the search data Finger to obtain the EPN value, and takes the smaller EPN value between the two as the effective EPN. Such processing enables the service channel to accurately search for the demodulation terminal, avoids the situation that the terminal near the base station cannot be searched due to too large EPN, and greatly improves the call success rate.

As shown in FIG. 3 , it is a schematic flowchart of a detailed detection method for a search window center in a cluster system provided by an embodiment of the present invention. The method for detecting the center of the search window in the cluster system provided by the present invention will be described in detail below with reference to FIG. 3 .

S201. The calling terminal sends a calling message, and after the reverse traffic channel of the base station demodulates the calling message, go to step S202;

S202. Obtain the periodically reported EPN value EPN_A according to the EPN callback function, and enter step S203;

S203, traverse all the claw and talon data in the Finger data, find out the minimum EPN value EPN_B in the locked state, and enter step S204;

S204. Take the smaller value MIN(EPN_A, EPN_B) of EPN_A and EPN_B, report this value as a valid EPN, and enter step S205;

S205. When the reverse traffic channel is established, determine the center of the reverse search window according to the obtained EPN value, wherein, the center of the search window=MIN(EPN_A, EPN_B)+reverse distribution time delay, enter step S206

S206. Set the center of the search window to the bottom chip, so that the bottom chip searches for demodulation terminals near the center of the search window according to a certain search window width, and then enters step S207;

S207. The reverse traffic channel demodulates a traffic frame of the terminal, such as a voice traffic frame, so as to enter a talking state.

Wherein, in step S201, the access messages for general ordinary calls are all accessed on the reverse access channel, and the connection is relatively slow. In order to meet the needs of fast access to the trunking system, the trunking call can be accessed on the traffic channel. The connection time is greatly shortened.

In step S202, the EPN callback function is registered when the service channel is established, and exists after the channel is successfully established. When it is detected that the EPN variation range exceeds a certain threshold, the latest EPN value will be reported.

In step S203, the service channel will save the search data in the search data Finger, each Finger data corresponds to 6 claws, and each claw corresponds to 4 talons, corresponding to 24 sets of data in total, and each set corresponds to the corresponding Finger locking times, According to various search algorithms, a value reaching a certain threshold of locking times and having the smallest EPN size can be found in these data, and this EPN can be regarded as a valid EPN. Wherein, the threshold value of the number of locking times may take a value between 20 and 48 according to empirical values.

In steps S204 and S205, the smaller EPN value is taken as the effective EPN. When the traffic channel is set up, the corresponding search window center is accurately set according to the EPN, so as to ensure that the traffic channel can search for the corresponding terminal, and avoid excessive EPN. to the terminal situation occurs.

The above description shows and describes a preferred embodiment of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various Various other combinations, modifications, and environments can be made within the scope of the inventive concept described herein, by the above teachings or by skill or knowledge in the relevant field. However, changes and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all be within the protection scope of the appended claims of the present invention.

Claims (10)

1. a kind of detection method of reverse search window center in cluster system, it is characterised in that including：

Obtain and demodulated after the call message that terminal is sent, the first EPN values of periodic report are obtained according to EPN call back functions；

Traversal history searches for data, and it is the 2nd EPN values to obtain the EPN minimum values under being in the lock state；

The smaller value of the first EPN values and the 2nd EPN values is reported into upper-layer service layer, when setting up reverse traffic channel, Reverse search window center is determined according to the EPN information that upper-layer service layer is carried, wherein, size of the reverse search window center etc. In the smaller and reverse distributed delay of the first EPN values and the 2nd EPN values and；

Wherein, during traversal history search data, judge EPN values whether in locking according to locking number of times threshold value set in advance Under state, when the locking number of times of EPN values exceedes the locking number of times threshold value, the EPN values are judged to be in the lock state down, Otherwise, under non-locking state；It is the 2nd EPN values to obtain the EPN minimum values under being in the lock state.

2. the detection method of reverse search window center in cluster system as claimed in claim 1, it is characterised in that reversely connecing Enter channel and obtain the call message that terminal is sent.

3. the detection method of reverse search window center in cluster system as claimed in claim 1, it is characterised in that in business letter The call message that terminal is sent is obtained on road.

4. the detection method of reverse search window center in cluster system as claimed in claim 3, it is characterised in that the EPN Call back function is registered when Traffic Channel is set up.

5. the detection method of reverse search window center in cluster system as claimed in claim 3, it is characterised in that also include：

According to the search window centre and search window width set in advance, the search demodulation terminal near search window centre.

6. a kind of detection means of reverse search window center in cluster system, it is characterised in that including：

First EPN value acquisition device, is demodulated, and obtained according to EPN call back functions for obtaining after the call message that terminal is sent First EPN values of periodic report；

2nd EPN value acquisition device, data are searched for for traversal history, and it is the to obtain and be in the lock state lower EPN minimum values Two EPN values；

Reverse search window center acquisition device, for when setting up reverse traffic channel, being believed according to the EPN that upper-layer service layer is carried Breath determines reverse search window center, wherein, the EPN information that upper-layer service layer is carried is the first EPN values and the 2nd EPN values Smaller value, the size of the reverse search window center is equal to smaller and the reversely distribution of the first EPN values and the 2nd EPN values The sum of time delay；

Wherein, the 2nd EPN values acquisition device is when traversal history searches for data, according to locking number of times thresholding set in advance Value judges whether EPN values are in the lock state down, when the locking number of times of EPN values exceedes the locking number of times threshold value, judges The EPN values is are in the lock state down, otherwise, under non-locking state；Obtain the EPN minimum values under being in the lock state For the 2nd EPN values.

7. the detection means of reverse search window center in cluster system as claimed in claim 6, it is characterised in that described first EPN values acquisition device obtains the call message that terminal is sent in Reverse Access Channel.

8. the detection means of reverse search window center in cluster system as claimed in claim 6, it is characterised in that described first EPN values acquisition device obtains the call message that terminal is sent on a traffic channel.

9. the detection means of reverse search window center in cluster system as claimed in claim 8, it is characterised in that the EPN Call back function is registered when Traffic Channel is set up.

10. the detection means of reverse search window center in cluster system as claimed in claim 8, it is characterised in that also include：

Terminal searching device is demodulated, for according to the search window centre and search window width set in advance, in search window Search demodulation terminal near the heart.