CN1173598C - Method for adapting service model changed by GPRS coding mode - Google Patents
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Abstract
The present invention discloses a method for adapting to a service model changed by a GPRS coding mode, which comprises the steps: a database is established for a mobile phone currently carrying out a data communication service, and is used for recording the measurement result of each interference estimation point of a plurality of recent TBFs; during the establishment of a new TBF between a GPRS system and the mobile phone and the data transmission process of each TBF, a coding mode estimating algorithm is invoked once every a plurality of interference estimation points according to records in the database of the interference estimation points so as to determine that whether coding mode conversion is carried out. The method has the advantages of enhanced precision of radio interference estimation, reduced frequency of the coding mode conversion and capability of enhancing the adaptability to the change of the relative position of the mobile phone.
Description
Technical field
The present invention relates to wireless communication system, relate in particular in GPRS (GPRS) system selection wireless channel Interference Estimation and coded system.
Background technology
Gprs system is at wireless air interface, be to adopt packet dedicated control channel (PDCH) to carry gprs service, PDCH has four kinds of channel coding methods, be that channel coding method is: CS-1, CS-2, CS-3 and CS-4, their RLC/MAC data block size (byte) is respectively 23,33,39 and 53, its speed (bps) be respectively 9050,1340,1560 and 2140.
To CS-4, transfer rate improves coded system successively from CS-1, CS-2, CS-3, but wireless antijamming capability is descended successively.Air interference generally represents with carrier/interface ratio, and the retransmission rate that the performance of coded system can radio block is represented, at GSM05.50 agreement (" Digital cellular telecommunications system (Phase 2+); Background for Radio Frequency (RF) requirements ") accompanying drawing in disclose under the desirable frequency hopping model of TU50, the piece retransmission rate is 10% o'clock, the message transmission rate curve of different channels coded system under different carrier/interface ratios.
From improving utilization ratio of wireless resources, gprs system need be selected best coded system according to the disturbed condition of wireless transmission.In GSM0550 agreement accompanying drawing, disclose high-throughput curve, represented that the forced coding mode under different carrier/interface ratios is selected.
The coded system that wireless air interface adopts is determined by gprs system.Need when carrying out up or downlink data transmission, all need set up a connection between gprs system and travelling carriage between gprs system and travelling carriage, we are referred to as Temporary Block Flow (TBF) at every turn.GPRS network is being set up the time marquis of TBF, the coded system initial value of specifying travelling carriage to adopt; GPRS network also can change the coded system that adopts in the life cycle of TBF, on down direction, initiatively change the coded system of downlink data block by gprs system, on up direction, change the coded system of uplink data block by control messages notice travelling carriage by gprs system.
Gprs system is mainly determined the coded system that adopt according to the situation of air interference.Because gprs system itself can't directly be measured the carrier/interface ratio value that characterizes air interference, so generally the power measurement that receives mobile station signal by the piece retransmission rate in the TBF transmission course, up direction and the up direction parameters such as the error rate that receive mobile station signal are come indirect Estimation.Hereinafter, the estimation operation that we will be so each time is called one " Interference Estimation point ".A kind of possible way is at present:
1) when setting up TBF, adopt a fixing coded system, be generally CS-1 or CS-2, this coded system is determined by data configuration;
2) at data transmission procedure, utilize the measurement result of " Interference Estimation point ", call " coded system algorithm for estimating ".In the coded system algorithm for estimating: if judge air interference greater than a certain higher limit, coded system is adjusted one-level to the low direction of speed; If judge air interference less than a certain lower limit, coded system is adjusted one-level to the high direction of speed.Threshold value determines by data configuration, and can be at different coded systems and difference.Then according to the coded system results estimated, the transform coding mode.
There is following problem in above-mentioned algorithm:
One, when setting up TBF, adopt a fixing coded system to have bigger blindness.Air interference between travelling carriage and the gprs system is decided by the relative position of travelling carriage to a great extent.For example, travelling carriage is all the time in the poor place of certain network coverage, and air interference will be very big all the time, and vice versa.If the coded system initial value that the air interference between gprs system and certain travelling carriage and gprs system adopt is inconsistent, will produce that the original transmission bandwidth is on the low side, the phenomenon of coded system frequent transitions, cause quality of wireless services to descend.And the relative position of travelling carriage has randomness, can't predict in advance concerning gprs system, therefore always has a certain proportion of travelling carriage the problems referred to above can occur.
Two, relatively poor to the estimated accuracy of air interference, erroneous judgement easily.From the characteristics of gprs service, frequent but the less business of data volume is a main flow.With regard to this type of was professional, the life cycle of each TBF was all shorter, and this estimates to bring difficulty to air interference.If with the input that the piece retransmission rate in the TBF transmission course is estimated as air interference, suppose that the data block quantity in the TBF process is N, the precision that the piece retransmission rate is calculated can not surpass 1/N, and in the less situation of every TBF data volume, precision is very poor; If receive the input that the power measurement of mobile station signal and the error rate that up direction receives mobile station signal are estimated as air interference with up direction, because the scope of these two parameter fluctuations itself is very big, need average it, and gprs system receives that whenever a data block can only produce a current measured value, therefore under the less situation of every TBF data volume, be difficult to obtain result more accurately.
Three, because above-mentioned 2 problems, gprs system is judging that adopt what coded system the time, the mistake probability is bigger.The result causes: it is higher that network is initiated coded system change frequency; Radio transmission performance descends; Waste of radio resources; QoS of customer descends.
Summary of the invention
The objective of the invention is, at the characteristics of gprs service model, provide a kind of we be referred to as the technical scheme of " GPRS coded system change business model adaptive method ", solve the problem that former scheme exists.So-called " the GPRS coded system changes the method that business model adapts to ", the measurement result of " Interference Estimation point " takes place in main technical schemes by log history, improve the accuracy of " coded system algorithm for estimating ", finally reach and reduce the purpose that coded system changes frequency, raising radio transmission performance, raising wireless resource utility efficiency, improves QoS of customer.
The method of a kind of adapting service model changed by GPRS coding mode of the present invention when carrying out up or downlink data transmission between gprs system and mobile phone, may further comprise the steps:
(1) between gprs system and mobile phone, sets up a connection, i.e. Temporary Block Flow (TBF);
(2) GPRS network is being set up the time marquis of TBF, the coded system initial value that designated mobile phone adopts;
(3) in the life cycle of GPRS network, change the coded system that adopts: wherein on down direction, initiatively change the coded system of downlink data block by gprs system at TBF; On up direction, change the coded system of uplink data block by control messages notice mobile phone by gprs system;
It is characterized in that: GPRS network is adapted coding mode and is adopted following method to realize in the life cycle of TBF:
(a) in the data transmission procedure of each TBF, define several " Interference Estimation points ";
(b) set up a database for the current mobile phone that carries out data communication service, be used to write down the measurement result of several TBF each " Interference Estimation point " recently;
(c) in the data transmission procedure of each TBF, measurement result is charged to number " Interference Estimation point " database at each " Interference Estimation point ";
When (d) setting up new TBF between gprs system and mobile phone, the record according in " Interference Estimation point " database calls " coded system algorithm for estimating ", and according to the definite coded system that should adopt of result;
(e) in the data transmission procedure of each TBF, call once " coded system algorithm for estimating " every several " Interference Estimation points ", according to the result, determine whether to carry out the coded system conversion.
In " coded system algorithm for estimating " mentioned above, for occurring in the early measurement result of time " Interference Estimation point ", charge to the input of algorithm for estimating by a weight, its weight is successively decreased by curve sometime.Method according to claim 2 is characterized in that: described by curve sometime successively decrease be linearly reduce, till 0.
The Processing Algorithm of " Interference Estimation point " mentioned above further comprises the steps:
Calculate current piece retransmission rate;
The coded system of piece retransmission rate, current employing and the absolute time of current time are deposited in " Interference Estimation point " database;
Call " coded system algorithm for estimating ";
If the coded system that " coded system algorithm for estimating " returns and current different starts the coded system conversion; Otherwise do not carry out the coded system conversion.
" coded system algorithm for estimating " mentioned above comprises step:
(A) calculate current Interference Estimation I, the life cycle of setting " Interference Estimation point " historical measurements M is T, it is decayed by the time first power to the contribution when leading decision, and remove coded system and the inconsistent measured value of present encoding mode, when " coded system algorithm for estimating " is used to judge TBF coded system initial value, need the current coded system of supposition earlier, this coded system can determine by data configuration, weight C computing formula should for:
C=(1-t/T), as t＜life cycle T, and coded system is consistent with the present encoding mode
0, as t＞=life cycle T, perhaps coded system and present encoding mode are inconsistent
Wherein t is the time of " Interference Estimation point " distance to current time,
In " Interference Estimation point " database, only keep recent N piece retransmission rate measured value M
Current Interference Estimation value I=SUM (Mi*Ci ...)/SUM (Ci ...)
B) return coded system
By the data configuration setup parameter, then according to current coded system, current Interference Estimation value I and respective threshold are compared, determine the coded system of returning.
The present invention utilizes the history value of air interference measurement, determines the initial value of coded system, improves the estimated capacity that current wireless is disturbed, and its weight is successively decreased by a time graph.
From the rule of gprs service, based on business frequent but that data volume is little, and travelling carriage and gprs system relative position change not quite between the professional emergence period, and under this situation, the present invention has following effect:
One, when setting up TBF, the possibility that the coded system that gprs system is selected is consistent with the air interference situation increases.Because generally speaking, travelling carriage is between secondary time transfer of data not far from one another, the amplitude that air interference changes all is smaller.
Two, increased the precision that air interference is estimated.Owing to the input of the result of more " Interference Estimation point " as algorithm for estimating arranged, so estimated accuracy also can increase.On average have only 10 piece situations to be exemplified below with each TBF.If adopt the piece retransmission rate as the foundation of estimating, former certainty of measurement has only 1/10=10%, and if consider the piece retransmission rate of a nearest N TBF now, certainty of measurement will be 1/ (N*10), has improved N times; If the power of the mobile station signal that the employing up direction is received and the error rate of the mobile station signal that up direction is received are as the foundation of estimating, originally it is average to have only 10 measured values to participate at most, if and now consider a nearest N TBF, participate in average measured value and be N*10.
Three, reduced the frequency of coded system conversion.Because the raising of estimated accuracy in the raising of initial value predictive ability and the transmission course, the chance that coded system changes obviously reduces.Gprs system begins just can select suitable coded system at TBF, also can make the comparison right judgement with regard to whether wanting the transform coding mode in transmission course.
Four, owing to adopt weight by the method that curve sometime successively decreases, change at the travelling carriage relative position, when air interference changed, gprs system also can adapt to this situation.
Further specify the flesh and blood of method of the present invention below in conjunction with the accompanying drawing of embodiment.
Description of drawings
Fig. 1 is the message transmission rate curve chart of the prior art of method of the present invention;
Fig. 2 is the forced coding mode selection figure of the prior art of method of the present invention;
Fig. 3 is the schematic diagram of method step of the present invention;
Fig. 4 is the tabulation schematic diagram of the coded system condition of returning of method of the present invention.
Embodiment
Fig. 1 is the message transmission rate curve chart of the prior art of method of the present invention.Figure Chinese and English explanation: Throughput=throughput; The BLER=block error rate; C/I: carrier/interface ratio (ratio of strength of carrier and interference strength).The figure shows four kinds of channel coding methods is: CS-1, CS-2, CS-3 and CS-4.To CS-4, transfer rate improves coded system successively from CS-1, CS-2, CS-3, but wireless antijamming capability is descended successively.Air interference generally represents with carrier/interface ratio, and the retransmission rate that the performance of coded system can data block represents that the piece retransmission rate is at 10% o'clock, the message transmission rate curve of different channels coded system under different carrier/interface ratios.As shown in the figure.As we can see from the figure, under different carrier/interface ratio (interference) situation, coded system different, message transmission rate the best is arranged.Radio Resource is very valuable, by implementing rational coded system change method, can improve utilization ratio of wireless resources effectively, guarantees the quality of communication simultaneously, and this is the very important problem of radio communication.
Fig. 2 is the forced coding mode selection figure of the prior art of method of the present invention.The high-throughput of figure Chinese and English explanation: Highestthroughput=; The BLER=block error rate; C/I: carrier/interface ratio (ratio of strength of carrier and interference strength).The forced coding mode that the figure shows under different carrier/interface ratios is selected.In theory, reasonably coded system changes algorithm, and its result should drop on the curve shown in the figure.We are bright to be exactly to propose a kind of reasonable method, can guarantee the result that coded system changes largely, meets above-mentioned curve.
Fig. 3 is the schematic diagram of method step of the present invention.As shown in Figure 3, in a TBF process, each gprs system receives that from travelling carriage the moment of data block is defined as one " Interference Estimation point ".In " Interference Estimation point " computing block retransmission rate, as the foundation of Interference Estimation.In the present embodiment, all repay examination at each " Interference Estimation point " and carry out coded system conversion, can consider also that under actual conditions several " Interference Estimation points " just once judge.The Processing Algorithm step of each " Interference Estimation point " is as follows:
1) calculates current piece retransmission rate.
2) coded system of piece retransmission rate, current employing and the absolute time of current time are deposited in " Interference Estimation point " database.
3) call " coded system algorithm for estimating ".
4) if the coded system that " coded system algorithm for estimating " returns and current different starts the coded system conversion; Otherwise return.
As shown in Figure 3,, promptly be labeled as the moment of " judging the coded system initial value " among Fig. 3, call " coded system algorithm for estimating ", determine the coded system that current TBF should adopt in the startup moment of TBF.Algorithm steps is as follows:
1) calls " coded system algorithm for estimating ".
2) start TBF and set up, the coded system of specifying coded system that travelling carriage should adopt and gprs system to adopt according to return value.
Two, " coded system algorithm for estimating "
1) calculates current Interference Estimation I
The life cycle of setting " Interference Estimation point " historical measurements M is T, and it is decayed by the time first power to the contribution when leading decision, and removes coded system and the inconsistent measured value of present encoding mode.When " coded system algorithm for estimating " is used to judge TBF coded system initial value, need the current coded system of supposition earlier, this coded system can be determined by data configuration.
Weight C computing formula should for:
C=(1-t/T), as t＜life cycle T, and coded system is consistent with the present encoding mode
0, as t＞=life cycle T, perhaps coded system and present encoding mode are inconsistent
Wherein t is the time of " Interference Estimation point " distance to current time.
In " Interference Estimation point " database, only keep recent N piece retransmission rate measured value M
Current Interference Estimation value I=SUM (Mi*Ci ...)/SUM (Ci ...)
Wherein M is the mark of measured value, and following C is the mark of weight, and its subscript i represents the calculating of the i time " Interference Estimation point ", and SUM () expression is sued for peace to the numerical value in the bracket.
2) return coded system
Set following parameter by data configuration:
T12: coded system from CS-1 to the CS-2 switching threshold
T23: coded system from CS-2 to the CS-3 switching threshold
T34: coded system from CS-3 to the CS-4 switching threshold
T43: coded system from CS-4 to the CS-3 switching threshold
T32: coded system from CS-3 to the CS-2 switching threshold
T21: coded system from CS-2 to the CS-1 switching threshold
According to current coded system, current Interference Estimation value I and respective threshold are compared then, can determine the coded system of returning.Fig. 4 is the tabulation schematic diagram of the coded system condition of returning of method of the present invention.After obtaining concrete coded system, gprs system is implemented this coded system two kinds of possibilities.At down direction, be gprs system control owing to adopt which kind of coded system, only need directly to implement.At up direction, adopting which kind of coded system is the travelling carriage operation, and gprs system can be notified travelling carriage by control command.
Three, " Interference Estimation point " data base administration
Because travelling carriage is mobile, and the internal memory of gprs system itself is limited, so when management " Interference Estimation point " database, will consider following 2 points: one, the professional generation arranged for the first time, be its storage allocation, set up " Interference Estimation point " database at travelling carriage; Two, detect in longer a period of time, the generation of the business of this travelling carriage is not out-of-date, removes " Interference Estimation point " database, and discharges internal memory.
Claims (5)
1, a kind of method of adapting service model changed by GPRS coding mode when carrying out up or downlink data transmission between gprs system and mobile phone, may further comprise the steps:
(1) between gprs system and mobile phone, sets up a connection, i.e. Temporary Block Flow (TBF);
(2) GPRS network is being set up the time marquis of TBF, the coded system initial value that designated mobile phone adopts;
(3) in the life cycle of GPRS network, change the coded system that adopts: wherein on down direction, initiatively change the coded system of downlink data block by gprs system at TBF; On up direction, change the coded system of uplink data block by control messages notice mobile phone by gprs system;
It is characterized in that: GPRS network is adapted coding mode and is adopted following method to realize in the life cycle of TBF:
(a) in the data transmission procedure of each TBF, define several " Interference Estimation points ";
(b) set up a database for the current mobile phone that carries out data communication service, be used to write down the measurement result of several TBF each " Interference Estimation point " recently;
(c) in the data transmission procedure of each TBF, measurement result is charged to number " Interference Estimation point " database at each " Interference Estimation point ";
When (d) setting up new TBF between gprs system and mobile phone, the record according in " Interference Estimation point " database calls " coded system algorithm for estimating ", and according to the definite coded system that should adopt of result;
(e) in the data transmission procedure of each TBF, call once " coded system algorithm for estimating " every several " Interference Estimation points ", according to the result, determine whether to carry out the coded system conversion.
2, method according to claim 1, it is characterized in that: in described " coded system algorithm for estimating ", for occurring in the early measurement result of time " Interference Estimation point ", charge to the input of algorithm for estimating by a weight, its weight is successively decreased by curve sometime.
3, method according to claim 2 is characterized in that: described by curve sometime successively decrease be linearly reduce, till 0.
4, method according to claim 2 is characterized in that: the Processing Algorithm of described " Interference Estimation point " further comprises the steps:
Calculate current piece retransmission rate;
The coded system of piece retransmission rate, current employing and the absolute time of current time are deposited in " Interference Estimation point " database;
Call " coded system algorithm for estimating ";
If the coded system that " coded system algorithm for estimating " returns and current different starts the coded system conversion; Otherwise do not carry out the coded system conversion.
5, method according to claim 4 is characterized in that: described " coded system algorithm for estimating " comprises step:
(A) calculate current Interference Estimation I, the life cycle of setting " Interference Estimation point " historical measurements M is T, it is decayed by the time first power to the contribution when leading decision, and remove coded system and the inconsistent measured value of present encoding mode, when " coded system algorithm for estimating " is used to judge TBF coded system initial value, need the current coded system of supposition earlier, this coded system can determine by data configuration, weight C computing formula should for:
C=(1-t/T), as t＜life cycle T, and coded system is consistent with the present encoding mode 0, and as t＞=life cycle T, perhaps coded system and present encoding mode are inconsistent
Wherein t is the time of " Interference Estimation point " distance to current time,
In " Interference Estimation point " database, only keep recent N the current Interference Estimation value of piece retransmission rate measured value M I=SUM (Mi*Ci ...)/SUM (Ci ...)
B) return coded system
By the data configuration setup parameter, then according to current coded system, current Interference Estimation value I and respective threshold are compared, determine the coded system of returning.
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