CN100433598C

CN100433598C - Method of judging complex pilot frequency biasing

Info

Publication number: CN100433598C
Application number: CNB031029566A
Authority: CN
Inventors: 杨宝国; 柯朝曦
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2002-08-29
Filing date: 2003-01-21
Publication date: 2008-11-12
Anticipated expiration: 2023-01-21
Also published as: CN1479467A

Abstract

The present invention puts forward a method for judging multiplexing pilot frequency biasing. Sectors C1, C2, C3, A are arranged; the times of switching occurring in the same time from the sector C1 to A, C2 to A, and C3 to A are respectively counted and are respectively marked as C1A, C2A and C3A. In C1A, C2A and C3A, if C1A is far greater than C2A and C3A or both C2A and C3A are 0, the n times of switching occurring from the sector A to pilot frequency biasing PN1 is determined to be the switching occurring from the sector A to C1. The method of the present invention uses reverse switching times to judge that the multiplexing pilot frequency biasing actually corresponds to which sector. The method makes onerous and bald adjacent region list optimization processes become simple and accurate, and greatly improves network optimization efficiency and quality. The method of the present invention is simple to realize, and avoids the disadvantage of depending on the latitude and longitude information of a base station transceiver. The method is likewise used under the condition of having no the latitude and longitude information of the base station transceiver, and has wide application.

Description

A kind of method of differentiating the multiplexed pilot biasing

Technical field

(Code Division Multiple Access, CDMA) system particularly relates to the adjacent area optimization method in the cdma system network planning to the present invention relates to code division multiple access.

Background technology

CDMA is a kind of multiple access interconnection technique based on broadband communication.In the CDMA communication system, base station and travelling carriage use same cdma wireless frequency band, shared same frequency, and different sectors is distinguished according to its pilot offset.Pilot offset always has 512, and its span is 0 ~ 511.

CDMA is a self-interference system, in order to prevent interference each other, considers the time delay of aerial signal simultaneously, and pilot offset generally concerns according to certain multiple and designs the multiple such as 4,6 or 8.Just still less after the sector number of a system reaches some, will inevitably there be the shared same pilot offset in two or more sectors in actual so operable pilot offset, promptly has the multiplexing situation of pilot offset.

In the handoff procedure in cdma system, travelling carriage can only switch to the sector its Neighboring Cell List from a sector; Otherwise can not switch.The adjacent area is called for short in sector in the Neighboring Cell List, and the adjacent area number is conditional, and regulation mostly is 20 most in the agreement.In order to guarantee that travelling carriage can normally switch and have good speech quality, reasonably configuring adjacent cell.It is an important component part of the network optimization that the adjacent area is optimized, by the network optimization add up, the actual operating data of analytical system, judge whether neighbor cell configuration reasonable? should comprise which sector in the decision Neighboring Cell List? the base station sends to travelling carriage to adjacent area list information by " Neighboring Cell List message ".The information that " Neighboring Cell List message " comprises is the pilot offset of adjacent area, does not have the special information such as position of sector.

The multiplexing problem of pilot offset is often run in the optimizing neighbor list process.There is the multiplexing cdma system of pilot offset for one, a pilot offset correspondence a plurality of sectors, be how to judge the switching that a sector to a pilot offset takes place, the switching which sector corresponding with this pilot offset takes place actually? these all are the problems that those skilled in that art press for solution.

At present, the method for prior art differentiation multiplexed pilot biasing is a discriminant by distance.The distance discrimination ratio juris is calculated the distance of each place, sector base station transceiver of current sector place base station transceiver and PN correspondence with regard to the latitude and longitude information that is to use base station transceiver, and nearest sector is exactly that sector of this pilot offset correspondence.

There is following defective in discriminant by distance:

Each base station transceiver must need accurate latitude and longitude information, if do not have latitude and longitude information or latitude and longitude information inaccurate, discriminant by distance can't adopt.In the cdma system of actual motion, often there is not the latitude and longitude information of base station; And the change information of base station transceiver position must real-time renewal.

Summary of the invention

In order to overcome the shortcoming that the discriminant by distance strictness depends on latitude and longitude of base station information, solve the problem that lacks the base station transceiver positional information that exists in the actual conditions, the present invention proposes a kind of method of differentiating the multiplexed pilot biasing, utilize this method only need be according to the real data of system operation, and oppositely how much judging of switching times do not need the base station transceiver positional information in the corresponding sector of multiplexed pilot biasing.

Technical scheme of the present invention is such:

Be provided with sector C1, C2, C3, A, add up sector C1 respectively toward A, C2 is toward A, and the switching times that C3 takes place in the identical time toward A is designated as C1A respectively, C2A, C3A;

When the data of the adjacent area of certain cdma base station system of statistics, have sector A and pilot offset PN1: n failure taken place toward PN1 and switched in sector A, but pilot offset PN1 is not in the Neighboring Cell List of sector A, and in current base station system, there are a plurality of sector C1, C2,, the pilot offset of Cm (m＞1) all is PN1

At C1A, C2A, among the C3A, if C1A is far longer than C2A, C3A, perhaps C2A and C3A are 0 (according to the pilot tone planning principle, C1A, C2A, C3A at most only have a value greater than 0), can determine that then n the switching that interior during this period of time sector A takes place toward pilot offset PN1 all is the switching that sector A takes place toward C1.

If all reverse switching times all are 0, then can ignore this pilot offset.

The method of the invention, be exactly in fact with reverse switching times differentiate multiplexing pilot offset actual be correspondence the method for which sector.Use this method, the optimizing neighbor list process can not realize under artificial the participation automatically.Make heavy, uninteresting optimizing neighbor list process become simple and accurate.The efficient and the quality of the network optimization have been improved greatly.

The method of the invention realizes simple, and the switch data that only needs to add up just can use well.Avoided discriminant by distance to depend on the shortcoming of base station transceiver latitude and longitude information, can use equally, had widely and use in the situation that does not have the base station transceiver latitude and longitude information.

Embodiment

The application of the method for the invention in the optimizing neighbor list process of the network planning is described below:

The first step: image data

The switch data of acquisition system operation, the sector, source when particularly switching and the information of target sector.When the travelling carriage request takes place once to switch, the pilot offset (i.e. the pilot offset of the target sector correspondence of Qie Huaning) in current sector, radio traffic channel place that takies of travelling carriage (i.e. the sector, source of Qie Huaning) and the current Candidate Set of travelling carriage (Candidate Set) is collected in the base station.When the data of the adjacent area of certain cdma base station system of statistics, have sector A and pilot offset PN1: n failure taken place toward PN1 and switched in sector A, but pilot offset PN1 is not in the Neighboring Cell List of sector A, and in current base station system, there are a plurality of sector C1, C2,, the pilot offset of Cm (m＞1) all is PN1.If base station system can accurately be judged the sector of each pilot offset correspondence in the Candidate Set, then collect the sector auxiliary information of pilot offset correspondence simultaneously.

The switch data of gathering being concentrated and filtering by network management center, is kept in the database of network management center.For the ease of statistics and analysis, the switch data that reports must have the timestamp information that switches.

Second step: statistics

Switch data in statistics a period of time.For each sector, according to the target sector statistic of classification of switching, the result that need add up comprises handoff request number of times, handover success rate and owing to is not the handover failure rate that the adjacent area caused.

For the reliability that guarantees to optimize, the time period of statistics was at least for 1 week.

The 3rd step: judge the sector that it is corresponding according to pilot offset

In the switch data that collect the base station, often can't report the information of its corresponding sector about pilot offset in the Candidate Set.Because the network planning is needed is that what to need is handoff relation between the clear and definite sector, so need to judge the sector of each pilot offset correspondence.

For there not being multiplexing pilot offset, be easy to just can judge its corresponding sector according to the configuration data of base station.

For multiplexing pilot offset,, can't judge the sector that it is corresponding because the shared identical pilot offset in a plurality of sector is directly used the configuration data of base station and the switch data of collection.Use the method for the invention just can judge the sector of each multiplexing pilot offset correspondence exactly.

According to the method for the invention, to each multiplexing pilot offset, add up the reverse switching times in the identical time, characteristics and balance principle according to wireless network, the C1A that is gathering, C2A ..., among the CmA, if C1A is far longer than C2A,, CmA, perhaps C2A, CmA is 0, n the switching that sector A takes place toward pilot offset PN1 in then can determining during this period of time all be sector A toward the switching that C1 takes place, just select the sector of reverse switching times maximum to regard the sector of this pilot offset correspondence.In particular cases, if all reverse switching times all are 0, then ignore this pilot offset.

The 4th step: revise Neighboring Cell List

According to the statistics in the 3rd step, the statistics of each sector is analyzed.From target sector, be chosen in the Neighboring Cell List, perhaps the handover failure rate that causes of " not being the adjacent area " reason greater than the sector of setting threshold value as the preliminary election Neighboring Cell List; From the preliminary election Neighboring Cell List, select 20 sectors of switching times maximum as Neighboring Cell List then.Revise Neighboring Cell List, new Neighboring Cell List data are kept in the database of Operation and Maintenance.

In the past, before the corresponding sector that can not differentiate the multiplexed pilot biasing automatically, can only carry out statistics and analysis to single sector at every turn.Must be under professional person's the guidance rule of thumb manual corresponding sector of selecting the multiplexed pilot biasing, the correction Neighboring Cell List of sector one by one then.Workload is very big, and makes mistakes easily; Because the difference of each one experience, the sector of choosing also may be inequality.

After adopting reverse switching diagnostic method, judge the corresponding sector of multiplexed pilot biasing automatically, once just can revise the Neighboring Cell List of sector in the whole network.Do not finish the whole process that the adjacent area is revised under artificial the participation.

The 5th step: synchrodata

Use the data sync instrument, in the database of new Neighboring Cell List data sync to the veneer.

Claims

1, a kind of method of differentiating the multiplexed pilot biasing is provided with sector C1, C2 ..., Cm, A adds up sector C1 respectively toward A, the past A of C2 ..., the switching times that Cm takes place in the identical time toward A is designated as C1A respectively, C2A ..., CmA; It is characterized in that:

When the data of the adjacent area of certain cdma base station system of statistics, have sector A and pilot offset PN1: n failure taken place toward PN1 and switched in sector A, but pilot offset PN1 is not in the Neighboring Cell List of sector A, and in current base station system, there are a plurality of sector C1, C2,, the pilot offset of Cm (m＞1) all is PN1;

At C1A, C2A ..., among the CmA, if C1A is far longer than C2A,, CmA, perhaps C2A, CmA is 0, n the switching that sector A takes place toward pilot offset PN1 in then can determining during this period of time all be sector A toward the switching that C1 takes place, promptly select the sector of reverse switching times maximum to regard the sector of this pilot offset correspondence.

2, the method for differentiation multiplexed pilot biasing according to claim 1 is characterized in that: if all C1A, C2A ..., the reverse switching times of CmA all is 0, then can ignore this pilot offset.

3, the method for differentiation multiplexed pilot biasing according to claim 1 and 2 is characterized in that also comprising:

From target sector, be chosen in the Neighboring Cell List, perhaps the handover failure rate that causes of " not being the adjacent area " reason greater than the sector of setting threshold value as the preliminary election Neighboring Cell List; From the preliminary election Neighboring Cell List, select 20 sectors of switching times maximum as Neighboring Cell List then;

Revise Neighboring Cell List, new Neighboring Cell List data are kept in the database of Operation and Maintenance.

4, the method for differentiation multiplexed pilot according to claim 3 biasing is characterized in that: use the data sync instrument, in the database of new Neighboring Cell List data sync to the veneer.

5, the method for differentiation multiplexed pilot according to claim 1 biasing is characterized in that: C1A, C2A ...., CmA at most only has a value greater than 0.