CN101137125B - CDMA cluster communication system conventional group calling terminal side adjacent cell information maintenance method - Google Patents
CDMA cluster communication system conventional group calling terminal side adjacent cell information maintenance method Download PDFInfo
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- CN101137125B CN101137125B CN2007100975815A CN200710097581A CN101137125B CN 101137125 B CN101137125 B CN 101137125B CN 2007100975815 A CN2007100975815 A CN 2007100975815A CN 200710097581 A CN200710097581 A CN 200710097581A CN 101137125 B CN101137125 B CN 101137125B
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Abstract
This method includes: firstly, the terminal (TM) stores the neighboring area info (NAI) received from F_SCH (FS) into the NAI buffer. Then, when FS generates a hard-switching, TM renews the record in the NAI selected series (NSS) with the newly received NAI in the NAI buffer according to the comparison result comparing with a record in NSS. Further, when TM receives NAI from FS or the activating set changes, TM combines selectively the record in NSS with the current record in NAI buffer to form a supplement neighboring set (SNS). Finely, SNS is used to replace the original neighboring area set. This invention raises the success rate of searching the useful leading frequency when the traditional group-calling terminal actively switches. It also lowers the probability of call-cut due to the delay renewing of the TM NAI.
Description
Technical field
The present invention relates to the CDMA trunked communication system, relate in particular to CDMA cluster communication system conventional group calling terminal side adjacent cell information maintenance method.
Background technology
The CDMA cluster communication system is based on CDMA 2000 exploitations, and this system also possesses the colony dispatching service function except all business functions that possess CDMA 2000 systems, such as conventional group calling, enhancing group calling, broadcasting group calling and individual calling etc.
The principal character of conventional group calling business is: number of users is unrestricted in the group that single contained fan is supported down, can utilize Limited resources, supports a large number of users to concentrate on the command scheduling function under the situation of same place.When conventional group calling is set up, shared forward fundamental channel (the ForwardFundamental Channel of each sub-district assignment in the scheduling district, be called for short F_FCH) and say customer reverse channel (Reverse FundamentalChannel Talking, be called for short R_FCHT), forward complement channel (the ForwardSupplemental Channel that assignment is shared, be called for short F_SCH) and listen customer reverse channel (Reverse FundamentalChannel Listening is called for short R_FCHL).Wherein, the forward direction voice channel is responsible for transmitting forward direction speech frame and signaling message; Say the customer reverse voice channel, be responsible for transmitting reverse speech frame and signaling message; Forward signaling channel is responsible for sending system parameter and Neighboring Cell List message; Listen the customer reverse signaling channel, in the most of the time, be in the Transmitter Turn-Off state, when user applies is made a speech, be responsible for transmitting the right of speech demand signalling.
Because the resource of same conventional cluster under same sector is to share fully, may have the user of a lot of same groups under same sector, just switching like this can't be as normal speech switching that works the independent switching of each user of realization.It all is to adopt terminal independently to switch that conventional group calling switches, and what wherein F_FCH and R_FCHT carried out is soft handover, and what F_SCH and R_FCHL carried out is direct-cut operation.
Because F_SCH is corresponding with the sub-district, its Neighboring Cell List that issues is the content of sub-district, place in the Operation ﹠ Maintenance System setting, but not the adjacent area Assembly Listing mode of being implemented as the normal speech business.Terminal directly substitutes original neighboring BS information after receiving new neighboring BS information.Therefore, this adjacent area of conventional group calling update mode can't enter order by pilot tone in the Active Set and judge that the terminal moving direction comes the optimum organization adjacent area, joins adverse effect thereby can't overcome the adjacent area leakage.
By above as can be known, at present the terminal of CDMA cluster communication system conventional group calling autonomous switch exist neighboring BS information to upgrade to lag behind, the too simple shortcoming of processing mode.Like this, cause neighboring BS information not upgrade in time owing to F_SCH can't in time finish direct-cut operation, terminal may finally can't search useful pilot tone and then produce call drop.
Summary of the invention
Technical problem to be solved by this invention is that a kind of CDMA cluster communication system conventional group calling terminal side adjacent cell information maintenance method will be provided, and can't effective search when the terminal that solves conventional group calling in the prior art is independently switched produces the problem of call drop to useful pilot tone.
In order to solve the problems of the technologies described above, the invention provides a kind of CDMA cluster communication system conventional group calling terminal side adjacent cell information maintenance method, comprise the steps:
(1) when forward direction complement channel (F_SCH) when direct-cut operation does not take place, terminal will be saved to the current neighboring BS information buffer memory from the neighboring BS information that F_SCH receives;
(2) when direct-cut operation takes place in described F_SCH, terminal is according to the result that the record in the neighboring BS information of preserving in the current neighboring BS information buffer memory of newly receiving and the neighboring BS information candidate queue compares, and uses the neighboring BS information of newly receiving in the current neighboring BS information buffer memory to upgrade record in the described neighboring BS information candidate queue;
(3) when terminal when F_SCH receives that neighboring BS information or Active Set change, terminal is selected combination to the record in record in the neighboring BS information candidate queue and the current neighboring BS information buffer memory, forms to replenish the adjacent area set;
(4) use described additional adjacent area set to replace original adjacent area collection.
In the above-mentioned CDMA cluster communication system conventional group calling terminal side adjacent cell information maintenance method, the neighboring BS information of newly receiving in the current neighboring BS information buffer memory of the described use of step (2) upgrades the record in the described neighboring BS information candidate queue, can comprise:
(21) described terminal is to existing information to compare in described neighboring BS information of newly receiving and the described neighboring BS information candidate queue, if exist in the described neighboring BS information candidate queue and the described identical record of newly receiving of neighboring BS information source pilot tone, then change step (22), otherwise change step (23);
(22) described terminal covers in the described neighboring BS information candidate queue and the described identical record of newly receiving of neighboring BS information source pilot tone, terminal procedure with the described neighboring BS information of newly receiving;
(23) described terminal further judges whether the length of described neighboring BS information candidate queue has reached the upper limit, if do not reach then change step (24), otherwise changes step (25);
(24) described terminal is added the described neighboring BS information of newly receiving in the described neighboring BS information candidate queue to, terminal procedure;
(25) if there is its not record in Active Set of source pilot tone in the described neighboring BS information candidate queue, described terminal covers described its not record in Active Set of source pilot tone with the neighboring BS information in the described current neighboring BS information buffer memory; If all in described Active Set, described terminal covers the most weak record of corresponding source pilot frequency intensity in the described neighboring BS information candidate queue with the neighboring BS information in the described current neighboring BS information buffer memory to the source pilot tone that writes down in the described neighboring BS information candidate queue.
Further, step (25) if described in have its not record in Active Set of source pilot tone in the described neighboring BS information candidate queue, can further stop this and write down pairing timer.
In the above-mentioned CDMA cluster communication system conventional group calling terminal side adjacent cell information maintenance method, described step (2) can comprise: when pilot tone shifts out from Active Set, and exist when deriving from the record of this pilot tone in the described neighboring BS information candidate queue, start timer, if this pilot tone is not returned described Active Set yet before the described timer expiry, then delete the record that derives from this pilot tone in the described neighboring BS information candidate queue.Further, can comprise: described pilot tone turns back to described Active Set before described timer expiry, and described terminal stops described timer.
In the above-mentioned CDMA cluster communication system conventional group calling terminal side adjacent cell information maintenance method, when the described selection of step (3) was made up, the principle of being followed can comprise:
(a) the pilot tone number in the described additional adjacent area set is no more than the supported pilot number upper limit of described adjacent area collection;
(b) the many pilot tones of occurrence number in described neighboring BS information candidate queue and described current neighboring BS information buffer memory preferentially enter described additional adjacent area set.
Further, described principle (b) can comprise: the described pilot tone identical to occurrence number, the preferential higher described pilot tone of source pilot frequency intensity of selecting enters described additional adjacent area set.
Further, described principle (b) can comprise: for a plurality of selecteed described pilot tones, according to its selecteed time sequencing, enter into described additional adjacent area set.
The inventive method makes conventional group calling terminal side be safeguarded the available neighboring BS information of a cover, thereby improves the success rate of searching for useful pilot tone when conventional group calling terminal independently switches, and probability of call takes place because the terminal neighboring BS information upgrades untimely in minimizing.
Description of drawings
Fig. 1 is the inventive method embodiment schematic flow sheet;
Fig. 2 is the maintenance process embodiment schematic flow sheet of neighboring BS information candidate queue in the inventive method;
Fig. 3 is the schematic flow sheet of another maintenance process embodiment of neighboring BS information candidate queue in the inventive method.
Embodiment
The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
Shown in Fig. 1 is to replenish the process that the adjacent area set produces and uses in the inventive method, comprises the steps:
Step 101: when direct-cut operation does not take place F_SCH, terminal will be saved in from the neighboring BS information that F_SCH receives the current neighboring BS information buffer memory;
Step 102: when direct-cut operation takes place F_SCH, terminal at first compares the record in the neighboring BS information of newly receiving preserved in the current neighboring BS information buffer memory and the neighboring BS information candidate queue, and, the record in the neighboring BS information candidate queue is upgraded with this neighboring BS information of newly receiving according to comparative result;
Step 103: when terminal when F_SCH receives that neighboring BS information or Active Set change, terminal is selected combination to the record in record in the neighboring BS information candidate queue and the current neighboring BS information buffer memory, forms an additional adjacent area and gathers;
Step 104: terminal is used and is replenished the original adjacent area of set replacement, adjacent area collection, forms the adjacent area collection after upgrading.
Current neighboring BS information buffer memory in the above-mentioned steps 101 is mainly used in and preserves the current neighboring BS information of receiving from F_SCH; Neighboring BS information candidate queue in the above-mentioned steps 102 is mainly used in when direct-cut operation takes place F_SCH, and the neighboring BS information in the current neighboring BS information buffer memory is added formation, and queue length is N1; Additional adjacent area set in the above-mentioned steps 103 is mainly used in the additional neighboring BS information that preservation is produced by the neighboring BS information candidate queue.
In addition, each record in the neighboring BS information candidate queue is all to there being a timer T, when pilot tone shifts out from Active Set, and exist when deriving from the record of this pilot tone in the neighboring BS information candidate queue, start the corresponding timer T of this record, if this pilot tone was not returned Active Set yet before timer T was overtime, then delete the record that derives from this pilot tone in the neighboring BS information candidate queue.
In the above-mentioned steps 102, the detailed process with the neighboring BS information of newly receiving upgrades the record in the neighboring BS information candidate queue describes in conjunction with Fig. 2 and Fig. 3 hereinafter.
Shown in Fig. 2 is the maintenance process of neighboring BS information candidate queue, is the process of adding record in the neighboring BS information candidate queue specifically.
The process that the neighboring BS information that usefulness in the above-mentioned steps 102 is newly received upgrades the record in the neighboring BS information candidate queue as shown in Figure 2, specifically comprises as follows:
Step 201: terminal if there is the identical record of neighboring BS information source pilot tone therewith in the neighboring BS information candidate queue, is then changeed step 202, otherwise is changeed step 203 existing information to compare in this neighboring BS information and the neighboring BS information candidate queue;
Step 202: terminal covers this record in neighboring BS information candidate queue with this neighboring BS information;
Step 203: terminal is obtained the length of neighboring BS information candidate queue and is judged, if its length does not also reach default upper limit N1 (is 3 such as value), then changes step 204, otherwise changes step 205;
Step 204: terminal is added this neighboring BS information in the neighboring BS information candidate queue to as new record, and queue length is upgraded, and also is about to queue length and adds 1;
Step 205: terminal further judges whether there is its source pilot tone not record in Active Set in the neighboring BS information candidate queue, if exist then change step 206, otherwise changes step 207;
Step 206: stop the corresponding timer T of this record, cover this record with the neighboring BS information in the current neighboring BS information buffer memory;
Step 207: cover the most weak record of corresponding source pilot frequency intensity in the neighboring BS information candidate queue with the neighboring BS information in the current neighboring BS information buffer memory.
Shown in Fig. 3 is another maintenance process of neighboring BS information candidate queue, is specifically when having pilot tone to cut out in the Active Set, and the process of redundant recording comprises the steps: in the terminal deletion neighboring BS information candidate queue
Step 301: when Active Set cuts out, whether have the record that derives from this pilot tone in the terminal judges neighboring BS information candidate queue as pilot tone; If have such record then change step 302, otherwise finish;
Step 302: starting the corresponding timer T of this record, is 2 seconds such as the time span of timer;
Step 305: if before timer expiry, the source pilot tone that this record is corresponding turns back to Active Set, then changes step 304, otherwise changes step 305;
Step 304: terminal stops the corresponding timer of this record, and covers this record, process ends with the neighboring BS information in the current neighboring BS information buffer memory;
Step 305: terminal is deleted the record that derives from this pilot tone, process ends from the neighboring BS information candidate queue.
In above-mentioned steps 103, when terminal was combined to form the set of additional adjacent area to the record in record in the neighboring BS information candidate queue and the current neighboring BS information buffer memory, the principle of being followed comprised:
Principle 1: the pilot tone number of replenishing in the set of adjacent area is no more than the supported pilot number upper limit of terminal Neighbor Set, and set this and quantitatively be limited to N2, be 40 such as the N2 value;
Principle 2: according to the number of times that pilot tone occurs in candidate queue and current neighboring BS information buffer memory, the preferential selection of person enters and replenishes the adjacent area set often;
Principle 3: on principle 2 bases, the pilot tone identical to occurrence number, the preferential higher Pilot PN of source pilot frequency intensity of selecting enters the set of additional adjacent area;
Principle 4: on the basis of principle 3, for a plurality of pilot tone records that satisfy these two conditions simultaneously, according to its selecteed time sequencing, entering and replenish the adjacent area set, also is the selecteed record of elder generation, preferentially joins and replenishes in the set of adjacent area.
The present invention is according to the autonomous characteristics of switching of present CDMA cluster communication system conventional group calling, proposed a kind of CDMA cluster communication system conventional group calling terminal side adjacent cell information maintenance method, realized that terminal farthest independently safeguards the adjacent area set that a cover most possibly switches.By the inventive method, improved the success rate of search patterns available when conventional group calling terminal independently switches, and then reduced generation probability of call because the terminal neighboring BS information upgrades untimely.
More than describe the operation principle of the inventive method in detail, but the example of this visualization of just enumerating for the ease of understanding should not be considered to be limitation of the scope of the invention.Equally, according to the description of technical scheme of the present invention and embodiment, can make various possible being equal to and change or replacement, and all these changes or replacement all should belong within the protection range of claim of the present invention.
Claims (8)
1. a CDMA cluster communication system conventional group calling terminal side adjacent cell information maintenance method is characterized in that, comprises the steps:
(1) when forward direction complement channel (F_SCH) when direct-cut operation does not take place, terminal will be saved to the current neighboring BS information buffer memory from the neighboring BS information that F_SCH receives;
(2) when direct-cut operation takes place in described F_SCH, terminal is according to the result that the record in the neighboring BS information of preserving in the current neighboring BS information buffer memory of newly receiving and the neighboring BS information candidate queue compares, and uses the neighboring BS information of newly receiving in the current neighboring BS information buffer memory to upgrade record in the described neighboring BS information candidate queue;
(3) when terminal when F_SCH receives that neighboring BS information or Active Set change, terminal is selected combination to the record in record in the neighboring BS information candidate queue and the current neighboring BS information buffer memory, forms to replenish the adjacent area set;
(4) use described additional adjacent area set to replace original adjacent area collection.
2. the method for claim 1 is characterized in that, the neighboring BS information of newly receiving in the current neighboring BS information buffer memory of the described use of step (2) upgrades the record in the described neighboring BS information candidate queue, comprising:
(21) described terminal is to existing information to compare in described neighboring BS information of newly receiving and the described neighboring BS information candidate queue, if exist in the described neighboring BS information candidate queue and the described identical record of newly receiving of neighboring BS information source pilot tone, then change step (22), otherwise change step (23);
(22) described terminal covers in the described neighboring BS information candidate queue and the described identical record of newly receiving of neighboring BS information source pilot tone, terminal procedure with the described neighboring BS information of newly receiving;
(23) described terminal further judges whether the length of described neighboring BS information candidate queue has reached the upper limit, if do not reach then change step (24), otherwise changes step (25);
(24) described terminal is added the described neighboring BS information of newly receiving in the described neighboring BS information candidate queue to, terminal procedure;
(25) if there is the not record in Active Set of its source pilot tone in the described neighboring BS information candidate queue, described terminal covers the not record in Active Set of described its source pilot tone with the neighboring BS information in the described current neighboring BS information buffer memory; If all in described Active Set, described terminal covers the most weak record of corresponding source pilot frequency intensity in the described neighboring BS information candidate queue with the neighboring BS information in the described current neighboring BS information buffer memory to the source pilot tone that writes down in the described neighboring BS information candidate queue.
3. method as claimed in claim 2 is characterized in that, step (25) if described in have not record in Active Set of its source pilot tone in the described neighboring BS information candidate queue, further stop this and write down pairing timer.
4. the method for claim 1, it is characterized in that, described step (2) comprising: when pilot tone shifts out from Active Set, and exist when deriving from the record of this pilot tone in the described neighboring BS information candidate queue, start timer, if this pilot tone is not returned described Active Set yet before the described timer expiry, then delete the record that derives from this pilot tone in the described neighboring BS information candidate queue.
5. method as claimed in claim 4 is characterized in that, further comprises: described pilot tone turns back to described Active Set before described timer expiry, and described terminal stops described timer.
6. the method for claim 1 is characterized in that, when the described selection of step (3) was made up, the principle of being followed comprised:
(a) the pilot tone number in the described additional adjacent area set is no more than the supported pilot number upper limit of described adjacent area collection;
(b) the many pilot tones of occurrence number in described neighboring BS information candidate queue and described current neighboring BS information buffer memory preferentially enter described additional adjacent area set.
7. method as claimed in claim 6 is characterized in that, described principle (b) further comprises: the described pilot tone identical to occurrence number, the preferential higher described pilot tone of source pilot frequency intensity of selecting enters described additional adjacent area set.
8. method as claimed in claim 7 is characterized in that, described principle (b) further comprises: for a plurality of selecteed described pilot tones, according to its selecteed time sequencing, enter into described additional adjacent area set.
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| CN101640847B (en) * | 2009-08-31 | 2014-11-05 | 中兴通讯股份有限公司 | Calling switch method and system |
| CN102572926A (en) * | 2010-12-24 | 2012-07-11 | 中兴通讯股份有限公司 | Method and device for reporting neighbor information |
| WO2011147375A2 (en) | 2011-06-07 | 2011-12-01 | 华为技术有限公司 | Adjacent cell optimization method, base station and system |
| WO2011147376A2 (en) * | 2011-06-07 | 2011-12-01 | 华为技术有限公司 | Method and base station for adjacent cell optimization |
| CN103841613B (en) * | 2012-11-23 | 2017-10-27 | 京信通信系统（中国）有限公司 | A kind of cell switching method and device |
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| CN1601948A (en) * | 2003-09-22 | 2005-03-30 | 华为技术有限公司 | Method for clustered user's terminal switching between small zones |
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| CN1601948A (en) * | 2003-09-22 | 2005-03-30 | 华为技术有限公司 | Method for clustered user's terminal switching between small zones |
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