CN1286285C - Carrier frequency selecting method for CDMA base station system with multiple carrier frequencies - Google Patents
Carrier frequency selecting method for CDMA base station system with multiple carrier frequencies Download PDFInfo
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- CN1286285C CN1286285C CN 02136171 CN02136171A CN1286285C CN 1286285 C CN1286285 C CN 1286285C CN 02136171 CN02136171 CN 02136171 CN 02136171 A CN02136171 A CN 02136171A CN 1286285 C CN1286285 C CN 1286285C
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Abstract
The present invention provides a carrier frequency selection method of a CDMA base station system under the condition of multiple carrier frequencies, which is suitable for treatment when a mobile station sets up a call. Firstly, a base station transceiver determines a district where the mobile station is positioned according to the call initiating position of the mobile station and obtains the correlation parameters of the district; then, the access carrier frequencies of the mobile station are determined according to the correlation parameters of the district and the mobile station; the call conditions of the initiated mobile station of the district where the mobile station is positioned are inquired to determine the business load condition of each of the carrier frequencies; finally, the working carrier frequency of the call of the mobile station is determined according to the business load conditions and the performance conditions of the access carrier frequencies of the mobile station. The present invention detects the service condition of each of carrier frequency resources of a multiple carrier frequency system at any moment in real time and selects the working carrier frequency of the mobile station according to the load condition of the carrier frequency so as to reduce the correlativity of the carrier frequencies, reduce the probability of carrier frequency straddling resource assignment and guarantee the load sharing and the full utilization of the resources among the carrier frequencies.
Description
Technical field
The present invention relates to code division multiple access (CDMA) mobile communcations system, specifically, relate to cdma base station system and setting up the method for carrying out the carrier frequency selection when calling out.
Background technology
In the CDMA mobile communcations system, base station transceiver (BTS) all adopts a high speed pseudo-random binary sequence to carry out spread spectrum to each signal, this random binary sequence is the Walsh function of 1.2288Mbit/s bit rate, and marks off a plurality of forward direction Code Channels thus.Different signal energies is assigned in the different pseudo random sequences, sends in a common frequency band (carrier frequency of 1.25MHz frequency bandwidth).The information of one's own useful signal is discerned and extracted to travelling carriage with the signal that receives according to the forward direction Code Channel of different forward direction Code Channels or different time biasing, and all travelling carriages also are to work under same carrier frequency.
In recent years, the CDMA mobile communcations system has all obtained all over the world developing swift and violently, and number of users is also in continuous rising.Because the forward direction Code Channel under carrier frequency of cdma system is limited, and all travelling carriages all are operated under the same carrier frequency, exist each other and disturb, when therefore the number of mobile stations of working down when the same sub-district of a base station transceiver increases, their interference each other also can increase thereupon, cause speech quality to reduce the most at last.In order to adapt to user's increase, need the capacity of raising system, increase carrier frequency exactly and improve the most direct effective way of power system capacity, overloading base station transceiver frequently is with respect to the base station transceiver of a single carrier frequency, and its capacity has growth at double.
In cdma base station system, set up when calling out and to use a lot of resources, comprise selector/vocoder, Channel Elements and Traffic Channel etc., therefore must before call setup, be the various resources of call distribution, and determine the relevant parameter of various resources, the resource that relates at the base station transceiver pusher side mainly contains Channel Elements, frame biasing, forward direction Code Channel etc.And under overloading frequency situation, the resource of different carrier frequency is separate, travelling carriage need be determined working carrier frequency when setting up calling, just relate to the problem that carrier frequency is selected, if carrier frequency is selected incorrectly, occur the low situation of call successful rate easily, and cause the waste of resource, reduce the performance of system, improved system cost.
Used carrier frequency selecting method is absolute mean allocation method at present, this method does not consider that travelling carriage is at the access carrier that rises when exhaling, and,, also brought a lot of problems though can guarantee the equilibrium utilization of each carrier frequency resource in the sector so only to the minimum carrier frequency distribution resource of affiliated resource occupation.At first, this method causes the performance of multi-carrier frequency system obviously to descend with respect to single loading system, mainly show a large amount of situation of striding the carrier frequency assignment resource that occurred, it is very big to the performance impact of system to stride the carrier frequency assignment resource, with different with assignment frequently, travelling carriage is higher to the performance requirement of target carrier frequency, and in actual environment, overloading is separate frequently, there is certain difference, and stride frequency and have mutual assignment problem, all might become target carrier frequency or source carrier frequency separately, therefore can't guarantee that the target carrier frequency forward signal can be suitable with the source carrier frequency; This flow process situation of Traffic Channel that the travelling carriage that is wherein increased simultaneously need transit to another carrier frequency work and accurately search appointment is the unpredictable and control of base station system, and the increase flow process will increase the possibility of failure.See with practical conditions, no matter the overloading of which kind of situation frequently, its performance descends during all than single year a lot, particularly when overloading frequently all disposed control channel, its call successful rate obviously descended, and has only 4～5 percentage points.Secondly, adopt this method all very difficult to overloading maintenance and optimization frequently, any problem appears in arbitrary carrier frequency all can ground wave and other carrier frequency, be difficult to the performance of another carrier frequency of direct estimation simultaneously by the performance of a carrier frequency, the coverage of each carrier frequency also can't be made accurate comparison, tracing it to its cause, mainly is that the existing resources distribution method directly causes overloading that too high correlation is arranged frequently, all the more so when particularly a plurality of carrier frequency all are furnished with control channel.Adopt this method the situation that causes whole sector to collapse after the carrier frequency collapse also can occur at last.
Summary of the invention
Technical problem to be solved by this invention is to provide the carrier frequency selecting method of a kind of cdma base station system when setting up calling, sets up problems such as the call successful rate that is brought when calling out is low, difficult in maintenance under the situation to solve prior art frequently in overloading.
Cdma base station system of the present invention is set up the carrier frequency selecting method when calling out under overloading frequency situation, may further comprise the steps:
Sub-district, travelling carriage place is determined in the position that first step base station transceiver is called out according to Mobile Origination, and obtains the relevant parameter of this sub-district;
Second step was determined the access carrier of travelling carriage according to the relevant parameter of sub-district, place and travelling carriage;
The 3rd step was inquired about the travelling carriage call case of having initiated under each carrier frequency of sub-district, travelling carriage place, determined the traffic load situation of each carrier frequency;
The 4th step is according to the traffic load situation and the performance situation of the access carrier of travelling carriage, determine the working carrier frequency that travelling carriage is this time called out: if the traffic load situation of the access carrier of travelling carriage and performance situation allow, the working carrier frequency of selecting this access carrier this time to call out as travelling carriage; Otherwise, the working carrier frequency of selecting the lightest carrier frequency of load this time to call out as travelling carriage.
Carrier frequency selecting method of the present invention, by real-time each carrier frequency resource of detection multi-carrier frequency system operating position at any one time, select the working carrier frequency of travelling carriage according to the carrier frequency load condition, thereby reduce the correlation of each carrier frequency, reduce the probability of striding the carrier frequency assignment resource, strengthen the stability of multi-carrier frequency system and maintainable, improved the performance of system, can guarantee making full use of of load sharing between each carrier frequency and resource simultaneously again.
Description of drawings
Fig. 1 is the flow chart of carrier frequency selecting method of the present invention.
Fig. 2 is the flow chart of a specific embodiment of the present invention.
Embodiment
The present invention considers, if the access carrier of travelling carriage and working carrier frequency are inconsistent, just need travelling carriage to transit to working carrier frequency search lock signal again from access carrier, and travelling carriage can be inside and outside locking signal on the new working carrier frequency be limited by system the various factors that are difficult to expect, thereby cause success rate not high, have a strong impact on every performance of system.And in fact, related protocol according to cdma system, travelling carriage can go out according to the HASH algorithm computation of appointment should under which specific carrier frequency standby and access, on the whole, the HASH algorithm can be assigned to each travelling carriage standby and access on each carrier frequency equably, therefore the unbalanced situation of mobile station calling access quantity under each carrier frequency can not occur, and the present invention has made full use of this characteristic.By determining the access carrier of travelling carriage, whether load condition and performance situation to the access carrier of travelling carriage allow to judge, the preferential working carrier frequency of selecting this access carrier this time to call out as travelling carriage, stride carrier frequency assignment resource odds thereby reduce, make multi-carrier frequency system be equivalent to a plurality of single loading systems, reduce the correlation between each carrier frequency.
Fig. 1 is the schematic flow sheet of carrier frequency selecting method of the present invention.At first, the sub-district, place that the Mobile Origination calling inserts is determined in the position that base station transceiver is called out according to Mobile Origination, and obtains the relevant parameter of this sub-district simultaneously.Determine the access carrier of travelling carriage according to the relevant parameter of this sub-district that obtains and travelling carriage.In the sub-district that travelling carriage inserts, obtain the traffic load situation of this each carrier frequency of sub-district.At last under the traffic load situation of the access carrier of travelling carriage and condition that the performance situation allows, the working carrier frequency of selecting this access carrier this time to call out as travelling carriage, can reduce to greatest extent like this and stride assigned resources odds frequently, and only under the situation of the access carrier overload of power of travelling carriage, just adopt the minimum principle of resource occupation to select the working carrier frequency of travelling carriage, do to make full use of system resource like this, the resources occupation rate between simultaneously also can balanced each carrier frequency.After choosing working carrier frequency, base station transceiver is the call distribution resource this time of travelling carriage on this carrier frequency.
In the present invention, for the working carrier frequency of determining travelling carriage is introduced two threshold values: stride assignment thresholding (Carrier Call Threshold) and calling balanced thresholding (Call Com Threshold) frequently, these two threshold values generally are chosen for the percent value of the peak load that can bear with respect to a carrier frequency.Stride assignment thresholding frequently and refer to load when a certain carrier frequency and be in this thresholding when following, its performance is more satisfactory, increases a user and can should not consider to select this access carrier as working carrier frequency at this moment to the too big influence of this carrier frequency formation; And when the load of carrier frequency met or exceeded this thresholding, it is many that its performance has descended relatively, and continuing to increase the user will be bigger to this carrier frequency influence, should consider to select other carrier frequency as working carrier frequency.Call out difference that balanced thresholding refers to the load of any two carrier frequency and be in this thresholding when following, these two residing performance state of carrier frequency can be thought the same basically, select any one carrier frequency the same substantially to the carrier frequency Effect on Performance as user's working carrier frequency between these two carrier frequency, should select access carrier as working carrier frequency this moment as far as possible.Therefore from above-mentioned definition to two threshold values, when certain access carrier is having under the assignable situation of resource, if surpassing, load do not stride the thresholding of assignment frequently, though or above striding the thresholding of assignment frequently, but compare with the load of these other carrier frequency of sub-district all not exceed and call out counterbalanced gate in limited time, should select this access carrier as working carrier frequency, otherwise should choose the lightest carrier frequency of load as working carrier frequency.
Fig. 2 is the flow chart of a specific embodiment of the present invention.When Mobile Origination is called out, the sub-district at travelling carriage place is determined in the position that the base station transceiver chance is called out according to Mobile Origination, obtain the relevant parameter of this sub-district simultaneously, as (steps 101) such as occupation condition of cell carrier frequencies configuration parameter, paging channel configuration parameter and each carrier frequency.Employed carrier frequency (step 102) when the feature identification sign indicating number of the paging channel configuring condition of this access sub-district and travelling carriage is determined that by the HASH algorithm travelling carriage inserts.Obtain each carrier frequency traffic load situation of this access sub-district then, and each carrier frequency is sorted (step 103) according to resources occupation rate order from small to large, can simplify subsequent step like this, improve the carrier frequency efficiency of selection.Whether the carrier frequency of judging the resources occupation rate minimum has assignable resource (step 104), if do not have, then illustrating has not had available resources under this sector, finishes carrier frequency and selects flow process; If have, then continue step 105.Whether the access carrier of judging travelling carriage still has allowable resource (step 105), if do not have, goes to step 108; If have, continue step 106, whether the resources occupation rate of judging the access carrier of travelling carriage surpasses strides the thresholding of assignment frequently, this step is to be used for judging whether increase a user again at this access carrier exerts an influence to performance, if do not surpass, then go to step 109, select the working carrier frequency of the access carrier of travelling carriage, finish carrier frequency then and select flow process as travelling carriage; If surpass, then continue execution in step 107, whether the resources occupation rate of judging the access carrier of travelling carriage exceeds one than the resources occupation rate of the carrier frequency of this local resource occupancy minimum and calls out balanced thresholding, this step is to satisfy under the prerequisite of step 106, whether the load of judging all carrier frequency in this sub-district is suitable, if quite, the influence of selecting any one carrier frequency so and being produced all is the same, in order to reduce the probability of striding assigned resources generation frequently, the access carrier that should select travelling carriage is as working carrier frequency.Call out balanced thresholding if result relatively exceeds, then select the working carrier frequency (step 108) of the carrier frequency of resources occupation rate minimum, finish carrier frequency then and select flow process as travelling carriage; Do not call out balanced thresholding if exceed, then select the working carrier frequency (step 109) of the access carrier of travelling carriage, finish carrier frequency and select flow process as travelling carriage.
One of key point of the present invention is to have introduced to stride the thresholding of assignment frequently and call out balanced thresholding.To the concrete calculating of each carrier frequency traffic load, and choosing of above-mentioned two threshold values should be determined according to the characteristic and the actual application environment of different system.For choosing of threshold value, should determine the maximum variance that allows of load between the design load of maximum of carrier frequency of system and carrier frequency according to the design capacity of system, these two threshold values are just got the percent value of the peak load that can bear with respect to a carrier frequency so, wherein striding the thresholding of assignment frequently value should be near the upper limit of system stable operation, the suggestion value is between 60%～80%, calling out balanced thresholding value should be near the maximum variance that allows of load between carrier frequency, and the suggestion value is between 10%～20%.And the capacity of calculating carrier frequency and the method for load have multiple, it mainly is the occupancy that calculates a certain or a few resources in the carrier frequency, each resource comprises each rank Walsh function, Channel Elements, forward direction rated power, frame biasing etc., mainly comes calculated capacity and load with 64 rank Walsh functions and forward direction rated power at present.
Claims (9)
1, the carrier frequency selecting method of a kind of CDMA base station system under overloading frequency situation is characterized in that, may further comprise the steps:
Sub-district, travelling carriage place is determined in the position that first step base station transceiver is called out according to Mobile Origination, and obtains the relevant parameter of this sub-district;
Second step was determined the access carrier of travelling carriage according to the relevant parameter of sub-district, place and travelling carriage;
The 3rd step was inquired about the travelling carriage call case of having initiated under each carrier frequency of sub-district, travelling carriage place, determined the traffic load situation of each carrier frequency;
The 4th step is according to the traffic load situation and the performance situation of the access carrier of travelling carriage, determine the working carrier frequency that travelling carriage is this time called out: if the traffic load situation of the access carrier of travelling carriage and performance situation allow, the working carrier frequency of selecting this access carrier this time to call out as travelling carriage; Otherwise, the working carrier frequency of selecting the lightest carrier frequency of load this time to call out as travelling carriage.
2, the carrier frequency selecting method of CDMA base station system according to claim 1 under overloading frequency situation, it is characterized in that the access carrier of described definite travelling carriage of second step is that the paging channel configuring condition of the sub-district of travelling carriage access and the feature identification sign indicating number of travelling carriage are determined by the HASH algorithm.
3, CDMA base station system according to claim 1 and 2 is characterized in that at the overloading carrier frequency selecting method under the situation frequently, and described the 3rd step also comprises sorts according to its resources occupation rate each carrier frequency by from small to large order.
4, the carrier frequency selecting method of CDMA base station system according to claim 1 and 2 under overloading frequency situation is characterized in that, described the 4th step further comprises:
1) whether the carrier frequency of judging the resources occupation rate minimum has assignable resource, if do not have, then illustrating has not had available resources under this sector, finishes carrier frequency and selects flow process; If have, then execution in step 2);
2) whether the access carrier of judging travelling carriage has allowable resource, if do not have, then goes to step 5); If have, then execution in step 3);
3) whether the resources occupation rate of judging the access carrier of travelling carriage surpasses and strides the thresholding of assignment frequently, if do not surpass, then goes to step 6); If surpass, then execution in step 4);
4) judge whether the resources occupation rate of the access carrier of travelling carriage surpasses balanced thresholding of calling of resources occupation rate of the carrier frequency of this local resource occupancy minimum; Call out balanced thresholding if result relatively exceeds, then execution in step 5); Do not call out balanced thresholding if exceed, then go to step 6);
5) select the working carrier frequency of the carrier frequency of resources occupation rate minimum, finish carrier frequency and select flow process as travelling carriage;
6) select the working carrier frequency of the access carrier of travelling carriage, finish carrier frequency and select flow process as travelling carriage.
5, the carrier frequency selecting method of CDMA base station system according to claim 3 under overloading frequency situation is characterized in that, described the 4th step further comprises:
1) whether the carrier frequency of judging the resources occupation rate minimum has assignable resource, if do not have, then illustrating has not had available resources under this sector, finishes carrier frequency and selects flow process; If have, then execution in step 2);
2) whether the access carrier of judging travelling carriage has allowable resource, if do not have, then goes to step 5); If have, then execution in step 3);
3) whether the resources occupation rate of judging the access carrier of travelling carriage surpasses and strides the thresholding of assignment frequently, if do not surpass, then goes to step 6); If surpass, then execution in step 4);
4) judge whether the resources occupation rate of the access carrier of travelling carriage surpasses balanced thresholding of calling of resources occupation rate of the carrier frequency of this local resource occupancy minimum; Call out balanced thresholding if result relatively exceeds, then execution in step 5); Do not call out balanced thresholding if exceed, then go to step 6);
5) select the working carrier frequency of the carrier frequency of resources occupation rate minimum, finish carrier frequency and select flow process as travelling carriage;
6) select the working carrier frequency of the access carrier of travelling carriage, finish carrier frequency and select flow process as travelling carriage.
6, CDMA base station system according to claim 4 is characterized in that at the overloading carrier frequency selecting method under the situation frequently, describedly strides the thresholding of assignment frequently and calls out the percent value that balanced thresholding is got the peak load that can bear with respect to a carrier frequency.
7, CDMA base station system according to claim 5 is characterized in that at the overloading carrier frequency selecting method under the situation frequently, describedly strides the thresholding of assignment frequently and calls out the percent value that balanced thresholding is got the peak load that can bear with respect to a carrier frequency.
8, the carrier frequency selecting method of CDMA base station system according to claim 6 under overloading frequency situation is characterized in that, the described thresholding of the assignment frequently value of striding is between 60%～80%; The balanced thresholding value of described calling is between 10%～20%.
9, the carrier frequency selecting method of CDMA base station system according to claim 7 under overloading frequency situation is characterized in that, the described thresholding of the assignment frequently value of striding is between 60%～80%; The balanced thresholding value of described calling is between 10%～20%.
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| CN 02136171 CN1286285C (en) | 2002-07-20 | 2002-07-20 | Carrier frequency selecting method for CDMA base station system with multiple carrier frequencies |
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| CN 02136171 CN1286285C (en) | 2002-07-20 | 2002-07-20 | Carrier frequency selecting method for CDMA base station system with multiple carrier frequencies |
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| CN1286285C true CN1286285C (en) | 2006-11-22 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100375558C (en) * | 2004-06-29 | 2008-03-12 | 中兴通讯股份有限公司 | Method for dynamically regulating auxiliary carrier frequency of multiple carrier frequency small village in radio communication system |
| CN100431380C (en) * | 2004-07-09 | 2008-11-05 | 中兴通讯股份有限公司 | Auxiliary carrier signal quality estimating and carrier selecting method for TD-SCDMA system |
| CN100362894C (en) * | 2004-07-13 | 2008-01-16 | 中兴通讯股份有限公司 | Method of carrier frequency resource configuration and carrier frequency state information report |
| WO2006005240A1 (en) * | 2004-07-14 | 2006-01-19 | Zte Corporation | A method for reporting and managing wireless resources in tdm system |
| CN100421480C (en) * | 2004-12-01 | 2008-09-24 | 华为技术有限公司 | Base station multiple carrier resource managing method |
| CN100382635C (en) * | 2005-02-18 | 2008-04-16 | 大唐移动通信设备有限公司 | Method for establishing multiple carrier frequency samll area |
| CN1917411B (en) * | 2005-08-16 | 2012-03-07 | 中兴通讯股份有限公司 | System and method for realization of accessing high speed down going packets in multiple carriers |
| CN100442891C (en) * | 2005-12-20 | 2008-12-10 | 华为技术有限公司 | Method, system and application of mobile terminal reporting frequency information |
| CN101159976B (en) * | 2007-08-24 | 2010-11-17 | 中国移动通信集团设计院有限公司 | Method and device of predicting telephone traffic and channel configuration |
| CN101883396B (en) * | 2009-05-05 | 2013-03-27 | 中兴通讯股份有限公司 | Method and device for selecting carrier frequency for mobile station |
| CN101959283B (en) * | 2010-08-27 | 2016-01-20 | 中兴通讯股份有限公司 | A kind of method and base station sending paging channel message in mobile station access process |
| CN103026747B (en) * | 2011-07-29 | 2015-07-08 | 华为技术有限公司 | Hard assignment method and radio access network device |
| CN102333319B (en) * | 2011-10-13 | 2017-07-21 | 南京中兴软件有限责任公司 | 1X strengthens the carrier frequency selecting method and device of business |
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