CN1168330C - Method for configurating offset of down link in CDMA cellular mobile communication system - Google Patents
Method for configurating offset of down link in CDMA cellular mobile communication system Download PDFInfo
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- CN1168330C CN1168330C CNB001275054A CN00127505A CN1168330C CN 1168330 C CN1168330 C CN 1168330C CN B001275054 A CNB001275054 A CN B001275054A CN 00127505 A CN00127505 A CN 00127505A CN 1168330 C CN1168330 C CN 1168330C
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Abstract
The present invention relates to a method for configuring a downlink offset in a CDMA cellular mobile communication system. The method comprises the steps that the configurable range of the offset is segmented according to sequence numbers, and the sequence number of each offset corresponds to an offset; a database which stores all offset configuring information and can be retrieved through the sequence numbers of the offset is created; frame segment numbers, time slot segment numbers and sub-segment numbers are determined in a delaminated mode, and positions of the offset to be configured are found out; the values of the offset are determined according to the positions of the offset and are output; the database is updated. The present invention expands the pilot frequency signals of different users, dispatches the service of the different users and reduces the peak emission power of the base station and the data processing load of the base station in different time.
Description
Technical field
The present invention relates to a kind of CDMA (code division multiple access) cell mobile communication systems, relate in particular to a kind of in the cdma cellular mobile communication system method of configurating offset of down link.
Background technology
Along with the development of mobile communication and the increase day by day of communication requirement, worldwide focus has all focused on the 3-G (Generation Three mobile communication system), as Future Public Land Mobile Telecommunication System (FPLMTS)---and the international mobile communication system (IMT-2000) in 2000 of the ITU of International Telecommunication Association or the universal mobile telecommunications system (UMTS) in Europe.And in 3-G (Generation Three mobile communication system), adopt CDMA technology, and also become a kind of common recognition, at present, there are three kinds of schemes to be received to the selection of IMT-2000 air interface, be respectively: wideband CDMA (WCDMA), CDMA 2000 and TD-SCDMA.The mobile communication system of a new generation is also had higher requirement aspect multimedia service, except supporting general speech business and low-speed data service, also needs to support image communication, high-speed data service and Packet Service etc. at a high speed.The jumbo characteristics of the system that adds have many users to carry out the communication of multiple business simultaneously with the base station in the synchronization, this is also with regard to requiring the base station in the system to have higher load disposal ability, can handle the business datum from up-downgoing in time.If but many user's data are all when identical moment emission in the sub-district, the base station just probably has little time to handle lot of data like this, causes very big processing delay, influences communication quality, has also reduced the capacity of system to a certain extent.
On the other hand, the superiority of CDMA digital mobile communication system is to have adopted many key technologies, if the key technology of system can not finely solve, then the high power capacity of code division multiple access system, high-quality just can not be realized.Wherein, power control is considered to the core of all key technologies.Because in the CDMA Digital Cellular System, because the cross-correlation effect of channel address sign indicating number will produce the influence of two aspects: the one, any one channel will be subjected to the interference of other different address code channels, and promptly multiple access disturbs; The 2nd, with serious interference distance receiver channel far away, make the strong signal of near-end cover the far-end weak signal apart from the near channel of receiver, Here it is near-far interference.Cdma system is a self-interference system, the accumulation of various interference all will the detract capacity and the quality of system.The purpose of power control is to make system can keep high quality communication, other Code Channel of co-channel (adjective) is not produced again and disturbs.Simultaneously, in mobile environment, there is serious signal fadeout,, therefore in cdma system, adopted the reference signal of special pilot frequency for user symbol as channel estimating for the very difficult phase reference that obtains of the coherent detection of data modulated signal.The special pilot frequency for user symbol can be time division multiplexing or code division multiplexing.For time-multiplexed frequency pilot sign, frequency pilot sign is all in the fixed position of all time slots of physical frame, and its length is according to the difference of Doppler frequency shift and difference.In order to obtain the precise channels parameter Estimation, generally speaking, frequency pilot sign is compared with data symbol has higher transmitting power.So, may there be a kind of totally unfavorable situation: when many users have the pilot transmission moment (timing relationship) in the identical moment with the service in base station channel, very high peak value must appear in the down transmitting power of base station, and it is corresponding to the x time of frequency pilot sign.This situation has improved the ratio (the Crest factor) of base station down peak power and average power on the one hand, the unexpected raising in this moment of self-interference level makes intrasystem communication quality seriously descend in the system on the other hand, thereby has also reduced the capacity of system.
Shown in Figure 1A and Figure 1B, in order to solve the problem of top two aspects, adopt effective method to control the x time of frequency pilot sign in the downlink radio frame of different user correspondence, make them on time-domain, be expanded, thereby eliminate the peak transmitted power problem (shown in Figure 1A) that pilot signal causes.Simultaneously, also need to dispatch the business of different user, make the base station also can on time-domain, launch, and needn't handle, thereby reduce the data processing load (shown in Figure 1B) of base station in the identical moment to the processing of these data.This can be by realizing for the different emission timing (side-play amount) of the physical channel radio frames configuration of different user.
At present, be that the concrete grammar of a new physical channel configuration side-play amount is, at first measure the processing loading condition of current time base station and the situation of change of base station down transmitting power, determine suitable side-play amount according to measuring the gained result then.This method can obtain the related parameter that has of needs more accurately, provides reliable foundation for disposing new side-play amount.
But, when adopting the processing loading condition directly measure base station sometime and down transmitting power to determine the method for down physical channel side-play amount, need the directly following major parameter of measurement:
1) the load processing variation situation of interior base station of the time period of a fixed length before and after the current time comprises mainly whether the occupation rate situation of change of base station buffering area, buffering occupation rate surpass maximum;
2) distribution situation of pilot signal on time domain of different physical channels, the just situation of change on time domain of base station down transmitting power in the current time certain hour section.
That is to say,, at first will obtain the measurement result of above-mentioned Several Parameters if when adopting this method to carry out the configuration of side-play amount.Do the shortcoming that has the following aspects like this:
1) measurement to base station loading condition and down transmitting power all is that data processing amount is big to the analysis of its situation of change in a period of time, the complexity height, thus the specific implementation of system has been proposed the requirement of very high data-handling capacity aspect;
2) all be analysis to the measurement of base station loading condition and down transmitting power to its situation of change in a period of time, measure and to continue one long period (reaching tens ms), real-time is relatively poor, be unfavorable for the side-play amount configuring request is reacted fast, thereby influence the access rate that the user serves;
3) all be analysis to their situations of change in a period of time to the measurement of base station loading condition and down transmitting power, the different length of (measuring period) also can influence the reliability of measurement result to a certain extent during this period of time.
Summary of the invention
The object of the present invention is to provide a kind of simple in the cdma cellular mobile communication system method of configurating offset of down link, rapid and reliable request response can be provided when reducing the data processing load, reducing the processing load and the base station down peak transmitted power of base station, thereby further improve the capacity and the service quality of system.
The object of the present invention is achieved like this, a kind of in the cdma cellular mobile communication system method of configurating offset of down link, comprise the following steps: the configurable range of side-play amount to be carried out segmentation, and make corresponding side-play amount of sequence number of each son section by sequence number; When carrying out new side-play amount configuration, adopt the step of following ' layering ': at first, determine the scope of the side-play amount that will dispose according to the load disposition of base station, this scope is a unit with a time slot section, comprises the time slot segment number in the residing frame segment number of this side-play amount and this frame section; Secondly, the configuration according to side-play amount in the time slot section of determining makes pilot signal can evenly distribute when launching on time domain, determines sub-segment number; At last, determine the position of side-play amount, obtain corresponding offset, more new database.
Above-mentioned in the cdma cellular mobile communication system method of configurating offset of down link, wherein, the content of the data field of each side-play amount sequence number correspondence record is in database: the traffic channel information that uses this side-play amount.
Above-mentioned in the cdma cellular mobile communication system method of configurating offset of down link, wherein, determine that the process of frame segment number, time slot segment number and the process of determining sub-segment number are separate.
Above-mentioned in the cdma cellular mobile communication system method of configurating offset of down link, wherein, can be that 15 time slot sections, each time slot section are that 5 son sections are carried out segmentation by 8 frame sections, each frame section to the configurable range of side-play amount.
Above-mentioned in the cdma cellular mobile communication system method of configurating offset of down link, wherein, the Traffic Channel of corresponding different user, the base station has specific down channel emission regularly, be side-play amount, these information all are kept in the side-play amount allocation list, when carrying out new side-play amount configuration, be done as follows by visit: calculate the load in each frame section, obtain the minimum value and the corresponding frame segment number of a load data in the side-play amount allocation list; In the frame section at the frame segment number place of this load minimum value correspondence, calculate the load in each time slot section, obtain the minimum value and the time slot corresponding segment number of load; In the time slot section at this load minimum value time slot corresponding segment number place, calculate the pilot signal strength in each son section, obtain the minimum value and the corresponding sub-segment number of pilot signal strength.
Above-mentioned in the cdma cellular mobile communication system method of configurating offset of down link, wherein, traffic channel information comprises transmission rate, transmitting power and uses this professional user ID.
Owing to adopted above-mentioned method, promptly utilize the side-play amount configuring condition of existing all downward special physical channels in the current area to estimate the traffic load at place, base station sometime, handle load, and the distribution situation of all down physical channel pilot signals in the sub-district, this indirect mode obtains the needed related parameter that has, handle load and base station down transmitting power with existing direct measurement base station and determine that the method for down physical channel side-play amount compares, avoided the data processing of the large amount of complex that brings because of the measurement demand, reduced when implementation algorithm requirement the device data disposal ability; Avoided the data processing time delay that causes because measure, and can database have been analyzed in advance, the desired value that acquisition will be disposed has further improved the real-time of configuration; Owing to do not need to measure the situation of change of interior base station load of a period of time and down transmitting power, the influence with regard to having avoided the measurement result reliable rows being brought like this because of the difference of measuring period.
Thereby reduce base station load and base station down emission peak power, improve power system capacity and service quality.
Description of drawings
Figure 1A is the schematic diagram that the configuration of existing employing side-play amount comes the x time of scattered pilot signal;
Figure 1B is that the configuration of existing employing side-play amount comes balanced base station to handle the schematic diagram of the division of load;
Fig. 2 is the schematic diagram that the present invention divides the segmentation of side-play amount configurable range;
Fig. 3 is the basic flow sheet of side-play amount placement algorithm of the present invention;
Fig. 4 is that the user makes a call in the sub-district and sets up the schematic diagram of a new Traffic Channel;
Fig. 5 is the user sets up Traffic Channel at Target cell by direct-cut operation a schematic diagram.
Embodiment
The present invention, promptly a kind of in the cdma cellular mobile communication system method of configurating offset of down link, its process is:
1) configurable range of side-play amount (the processing cycle of load, i.e. weaving length are handled in the base station) being carried out segmentation divides.As shown in Figure 2, at first be that unit is divided into 8 ' frame sections ' with the frame, be again that unit is divided into 15 ' time slot sections ' with the time slot in each frame section then, each time slot section is divided into 5 son sections more at last, and the resolution of side-play amount is exactly the length of son section.The side-play amount (the sub-segment length of sequence number *) of the corresponding reality of sequence number of each son section, the sequence number of n son section of for example corresponding the 1st frame section m time slot Duan Zhongdi is: (1*75+m*15+n), corresponding offset is the sub-segment length of (1*75+m*15+n) *.
2) set up a database, come the side-play amount of the downward special physical channel of all different links in the recording cell, and can retrieve by the sequence number of side-play amount with it, each side-play amount sequence number all corresponding the Traffic Channel of this side-play amount of use of some.In running, this database is dynamically updated, make it can be in real time, the pilot signal distribution situation of downward special physical channel in the processing load of the different base stations constantly of indirect reaction and the sub-district accurately: when being a newly-established traffic channel configuration after the side-play amount, the new configuration information of increase in this database just; Equally, when Traffic Channel disconnects, just in this database, discharge corresponding information.Traffic channel information comprises transmission rate, transmitting power and uses this professional user ID.
3) when carrying out new side-play amount configuration, adopt the method for following ' layering ':
As shown in Figure 3, when a new downward special physical channel need be set up, it is the side-play amount configuring request, at first determine the scope of the side-play amount that will dispose by the load disposition at base station place, as shown in Figure 2, this scope is a unit with a time slot section, comprises residing time slot section in the residing frame section of this side-play amount and this frame section.When determining this scope, can realize that the simplest method is utilized canned data in the database exactly by different algorithms, relatively the dedicated channel number that comprises in the different range is found out wherein minimum one.Accurate more algorithm it is also conceivable that the out of Memory of channel, for example the message transmission rate of each channel etc.If there are a plurality of side-play amounts optional, then select one of them arbitrarily.
Then the configuration of considering side-play amount in this time slot section of determining is to the expansion effect of pilot signal on time domain, to determine sub-segment number.Simple implementation method is exactly to find out the sub-segment number with minimum channel in determined time slot section, so that pilot signal evenly distributes can launch on time domain the time; Accurate more algorithm it is also conceivable that the out of Memory of channel, for example the pilot bits number in each channel, the transmitting power of pilot signal etc.If have a plurality of then select one of them arbitrarily.
In conjunction with two above-mentioned processes, promptly determine frame segment number, time slot segment number process and sub-segment number process, determine the definite position of side-play amount, obtain suitable side-play amount, more new database.
These two processes are separate, because the emission of pilot signal is the cycle with a time slot, can only consider in a time slot its distribution.So the present invention determines the residing son section of side-play amount from reducing the angle of base station down emission peak power; And, determine residing frame section of side-play amount and time slot section from reducing the angle that load is handled in the base station.
As shown in Figure 4, if the user UEn request of making a call in certain sub-district to set up Traffic Channel, at this moment, has a plurality of other users and communicates with the base station in the sub-district.The Traffic Channel of corresponding different user, base station have specific down channel emission regularly, i.e. side-play amount, and these information all are kept in the side-play amount allocation list (database).
At first do as giving a definition:
Load-F
1: frame section internal burden refers to the load that all Traffic Channels cause the base station in the 1st frame section in the side-play amount configurable range;
Load-S
1, m: time slot section internal burden refers to the load that all Traffic Channels cause the base station in m time slot of the 1st frame Duan Zhongdi;
Load-T
1, m, n: son section internal burden refers to the load that all Traffic Channels of n side-play amount correspondence of m time slot Duan Zhongdi of the 1st frame section cause the base station.Wherein:
Concern as follows: Load-F
1=∑ Load-S
1, mM=0～14
Load-S
1，m＝∑Load-T
1，m，n n＝0～4
Load-F-min:Load-F
1Minimum value;
Load-S-min:Load-S
1, mMinimum value;
N-Load-F-min: the frame segment number of corresponding Load-F-min;
N-Load-S-min: the time slot segment number of corresponding Load-S-min;
PilotStrength
n: the pilot signal strength on the son section, the just pilot signal strength that all links produce on the n side-play amount in the sub-district.
PilotStrength-min:PilotStrength
nMinimum value (n=0～4)
N-PilotStrength-min: the sub-segment number of corresponding PilotStrength-min.
When carrying out new side-play amount configuration, be done as follows by visit to data in the side-play amount allocation list:
1) Load-F1 of each frame section of calculating in the configurable range of side-play amount obtains minimum value Load-F-min and corresponding N-Load-F-min;
2) Load-S of each time slot of calculating in the frame section of N-Load-F-min correspondence
1, m, obtain minimum value Load-S-min and corresponding N-Load-S-min;
3) PilotStrength of each sub-field offset amount correspondence of calculating in N-Load-S-min time slot corresponding section
n, obtain minimum value PilotStrength-min and corresponding N-PilotStrength-min;
4), obtain definite side-play amount in conjunction with the result of above-mentioned three steps.
As shown in Figure 5, when the mobile subscriber sets up new Traffic Channel by direct-cut operation in Target cell in moving process, also to carry out new side-play amount configuration for it.The method of configuration and process repeat no more with embodiment 1 herein.
Claims (6)
1. the method for a configurating offset of down link in the cdma cellular mobile communication system is characterized in that, comprises the following steps:
By sequence number the configurable range of side-play amount is carried out segmentation, and make corresponding side-play amount of sequence number of each son section;
When carrying out new side-play amount configuration, adopt the step of following ' layering ':
At first, determine the scope of the side-play amount that will dispose according to the load disposition of base station, this scope is a unit with a time slot section, comprises the time slot segment number in the residing frame segment number of this side-play amount and this frame section; Secondly, the configuration according to side-play amount in the time slot section of determining makes pilot signal can evenly distribute when launching on time domain, determines sub-segment number; At last, determine the position of side-play amount, obtain corresponding offset, more new database.
2. according to claim 1 a kind of in the cdma cellular mobile communication system method of configurating offset of down link, it is characterized in that the content of the data field of each side-play amount sequence number correspondence record is in database: the traffic channel information that uses this side-play amount.
3. according to claim 1 a kind of in the cdma cellular mobile communication system method of configurating offset of down link, it is characterized in that, determine that the process of frame segment number, time slot segment number and the process of determining sub-segment number are separate.
4. according to claim 1 a kind of in the cdma cellular mobile communication system method of configurating offset of down link, it is characterized in that, can be that 15 time slot sections, each time slot section are that 5 son sections are carried out segmentation by 8 frame sections, each frame section to the configurable range of side-play amount.
5. according to claim 1 a kind of in the cdma cellular mobile communication system method of configurating offset of down link, it is characterized in that, the Traffic Channel of corresponding different user, the base station has specific down channel emission regularly, it is side-play amount, these information all are kept in the side-play amount allocation list, when carrying out new side-play amount configuration, are done as follows by the visit to data in the side-play amount allocation list:
Calculate the load in each frame section, obtain the minimum value and the corresponding frame segment number of a load;
In the frame section at the frame segment number place of this load minimum value correspondence, calculate the load in each time slot section, obtain the minimum value and the time slot corresponding segment number of load;
In the time slot section at this load minimum value time slot corresponding segment number place, calculate the pilot signal strength in each son section, obtain the minimum value and the corresponding sub-segment number of pilot signal strength.
6. according to claim 2 a kind of in the cdma cellular mobile communication system method of configurating offset of down link, it is characterized in that described traffic channel information comprises transmission rate, transmitting power and uses this professional user ID.
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| CNB001275054A CN1168330C (en) | 2000-11-23 | 2000-11-23 | Method for configurating offset of down link in CDMA cellular mobile communication system |
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| CNB001275054A CN1168330C (en) | 2000-11-23 | 2000-11-23 | Method for configurating offset of down link in CDMA cellular mobile communication system |
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| CN1168330C true CN1168330C (en) | 2004-09-22 |
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| TWI455509B (en) * | 2002-08-07 | 2014-10-01 | Intel Corp | Channel switching for support of multimedia broadcast and multicast services |
| CN100397914C (en) * | 2003-07-03 | 2008-06-25 | 华为技术有限公司 | A method for implementing location update registration |
| CN100415013C (en) * | 2004-10-09 | 2008-08-27 | 华为技术有限公司 | Method for recognition state and position of listener in trunking communication procedure |
| CN100426702C (en) * | 2005-03-25 | 2008-10-15 | 上海华为技术有限公司 | Method for configuring downlink transmission timing offset in CDMA system |
| CN100444556C (en) * | 2005-09-02 | 2008-12-17 | 中兴通讯股份有限公司 | HSMAC dispatching method based on dispatching pattern |
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