CN101162967B - Velocity allocating algorithm of forward supplementary channel - Google Patents
Velocity allocating algorithm of forward supplementary channel Download PDFInfo
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- CN101162967B CN101162967B CN2006101403772A CN200610140377A CN101162967B CN 101162967 B CN101162967 B CN 101162967B CN 2006101403772 A CN2006101403772 A CN 2006101403772A CN 200610140377 A CN200610140377 A CN 200610140377A CN 101162967 B CN101162967 B CN 101162967B
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Abstract
The invention discloses a rate assignment algorithm of forward supplemental channel, concerning a high-speed data download service in CDMA2000 and invented for solving the problem that the system resources cannot be fully utilized in the existing rate assignment. The rate assignment algorithm of forward supplemental channel comprises the following steps: (1) the conditional parameters of the forward supplemental channel are set up. (2) The current error frame rate of the used forward supplemental channel between a base station and a terminal is obtained. (3) The rate of built forward supplemental channel when the next scheduling applies is set up according to the current error frame rate and the conditional parameters. The invention adjusts the rate of the forward supplemental channel in real time according to the current rate and the error frame rate, improving the data transmission rate as much as possible, thereby making full use of the channel. The invention is mainly applied to the adjustment of the rate of the forward supplemental channel of the high-speed data download service in CDMA2000 reasonably.
Description
Technical field
The present invention relates to CDMA2000 high speed data download service, particularly the velocity allocating algorithm of the forward complement channel of CDMA2000 high speed data download service (FSCH).
Background technology
CDMA2000 provides data download service, the data download service of low speed is realized by setting up primary channel (FCH) between terminal (comprising mobile phone, fixed station, card of surfing Internet etc.) and the base station, and the high-speed data downloading service is to realize by the forward complement channel (FSCH) of setting up different rates between terminal and the base station.The forward complement channel message transmission rate adopts 1X, 2X, and 4X, 8X, 16X, the form of 32X is expressed, and wherein X is a basic rate, and the basic rate of stipulating in the IS2000 standard has two kinds of 9600bit/s and 14400bit/s.Message transmission rate is high more, and system is also many more to the resource that this physical channel distributes, and both are directly proportional.The resource that forward complement channel uses comprises: Channel Elements, walsh code, frame biasing and power resource.
If need to set up FSCH at a high speed between certain sub-district of terminal and base station, one group of spreading code with high-quality autocorrelation performance and crosscorrelation performance inferior) and remaining power resource the base station can be decided the speed of the actual FSCH that can set up according to the current available radio resources in this sub-district, and Radio Resource mainly comprises CE (Channel Elements), available WalshCode (walsh codes:; If CE, WalshCode resource are enough, can set up FSCH so and depend on the remaining power in this sub-district fully, decide according to dump power and to set up FSCH and may have following two problems: algorithm is too conservative, the speed that assignment is come out is low excessively, and in fact can set up the FSCH of higher rate, cause the user can not use original operable downloading rate faster; Algorithm is too taken a risk, the speed that assignment is come out is too high, even reach the upper limit by power control transmitting power, frame error rate is also very high, so just cause active data service downloading speed very low, both wasted the power resource of base station on the one hand, and also made the user can not use the data download service of higher rate.
Summary of the invention
For overcoming above-mentioned defective, the object of the present invention is to provide a kind of velocity allocating algorithm that had not only guaranteed that frame error rate is low but also realized the forward complement channel of higher rate.
To achieve the above object of the invention, the velocity allocating algorithm of forward complement channel of the present invention may further comprise the steps:
(1) obtain the maximum rate of the forward complement channel of service negotiation in the call establishment, the minimum-rate of permission, and the target frame error rate of different rates forward complement channel, the higher limit of frame error rate and the lower limit of frame error rate;
(2) obtain the current frame error rate of the forward complement channel of this use between base station and the terminal;
(3) in the current frame error rate of the forward complement channel of described this use lower limit less than described frame error rate, and the forward complementary channel velocity of current foundation is during less than described maximum rate, and next time, the speed of the forward complement channel that the scheduling application is set up improved a grade at least on the basis of the forward complementary channel velocity of described current foundation; Greater than the forward complementary channel velocity of the higher limit of described frame error rate and current foundation during greater than described minimum-rate, next time, the speed of the forward complement channel that the scheduling application is set up reduced a grade at least on the basis of the forward complementary channel velocity of described current foundation in the current frame error rate of the forward complement channel of described this use.
Wherein, described step (2) is specially:
(21) base station sends Extended Supplemental Channel Assignment Message to terminal;
(22) terminal is received Extended Supplemental Channel Assignment Message, reports Power Measurement Report Message to the base station after current forward complement channel finishing scheduling;
(23) the current frame error rate of forward complement channel is calculated in the base station according to the Power Measurement Report Message of receiving.
Wherein, described step (3) also comprises the steps: when the time overtime threshold value of continuously scheduling or when scheduling times surpasses frequency threshold value continuously afterwards, the base station with the next one continuously scheduling use the scheduling that discontinuously dispatching carries out forward complement channel instead.
Wherein, described time threshold values or number of times threshold values are by base station sets.
According to the described method of technique scheme in the process of implementation, the speed of keeping forward complement channel in the time of in frame error rate maintains permissible range is constant; When too high and speed did not drop to the minimum-rate of permission when frame error rate, the base station will reduce the speed of the forward complement channel of less important foundation down; Cross low and speed when not reaching maximum when frame error rate, the speed of the forward complement channel of less important foundation down will be improved in the base station.Can guarantee that by such control the speed of frame error rate and forward complement channel maintains a comparatively desirable level, under the prerequisite that guarantees transmission quality, obtain higher transmission rate, satisfy the demand of more users.And also added the function of scheduling flow control among the present invention, made FSCH can not be in the state of continuous scheduling always, guaranteed the correct transmission of power measurement report (PMRM) message.
Description of drawings
Fig. 1 closes interacting message schematic diagram between the terminal for the base station;
Fig. 2 is the flow chart of the velocity allocating algorithm of forward complement channel of the present invention;
Fig. 3 is the scheduling mode control flow chart of the velocity allocating algorithm of forward complement channel of the present invention.
Embodiment
The speed that all needs the assignment transfer of data when base station in each distribution cdma system and the forward complement channel between the terminal (FSCH), causing data to pass in order to make speed be unlikely to too high is that quality descends, also be unlikely to low and do not make full use of the resource of the forward complement channel of distribution, cause the wasting of resources, the present invention maintains a suitable level with message transmission rate.The principle of the velocity allocating algorithm of forward complement channel of the present invention is: the base station is after ESCAM (Extended Supplemental Channel Assignment Message) message of FSCH is set up in transmission to terminal, and terminal reports PMRM (power measurement report) message to the base station; After PMRM message is received in the base station, calculate current FSCH frame error rate, and the target frame error rate corresponding with current FSCH speed compare, will set up the speed of FSCH with decision scheduling application next time.
The principle of above-mentioned algorithm can realize with following flow process:
Step 1:, the upper limit MaxFer and the lower limit MinFer of FSCH frame error rate is set earlier according to target frame error rate TargetFer;
Step 2: after the base station sent ESCAM message to terminal, terminal reported PMRM message to the base station, as shown in fig. 1;
Step 3: after the PMRM message of terminal to report is received in the base station, calculate the current frame error rate of the FSCH of this use, the speed of FSCH is set up in the definite application next time of the scanning frequency of going forward side by side rate allocating algorithm.Above-mentioned frame error rate is meant the wrong frame number received and the ratio of totalframes.
According to above-mentioned method, the speed of forward complement channel of the present invention domination algorithm is by obtaining the frame error rate of FSCH in real time, and dynamically adjusts the speed of FSCH according to frame error rate, makes channel reach higher utilance.
Be in better in order to ensure terminal transmission behind the reduction of speed that continuous scheduling does not report PMRM and can not raising speed always, when the time of continuous scheduling overtime threshold value or when continuously scheduling times surpasses frequency threshold value, the base station is dispatched the next one continuously and is used the scheduling that discontinuously dispatching carries out forward complement channel instead, so that allow PMRM message of terminal to report.
The present invention is useful in the cdma system and distributes in the forward complement channel between system base-station and terminal, be example with the CDMA2000 communication system below, in conjunction with Fig. 2 to one of the velocity allocating algorithm of forward complement channel of the present invention comparatively specific embodiment be described in detail, after the base station has sent the solicited message of setting up FSCH, enter following steps in terminal:
201, the base station obtains the minimum-rate MinRate of FSCH of FSCH maximum rate MaxRate, the permission of service negotiation in the call establishment, and the target frame error rate of different rates FSCH, the upper limit value M axFer of frame error rate, the lower limit MinFer of frame error rate;
202, the base station sends ESCAM message to terminal, be used for setting up the FSCH between base station and the terminal, FOR_SCH_FER_REP field among the ESCAM extends this as TRUE, with the expression of 1 in the binary system, so that terminal can report PMRM message to the base station after current FSCH finishing scheduling;
203, the PMRM message of terminal to report is received in the base station, calculates the current frame error rate CurrentFer of the FSCH of this use;
204, the base station is with CurrentFer with set in advance frame error rate lower limit MinFer and upper limit MaxFer compares; If satisfy MinFer≤CurrentFer≤MaxFer, turn to step 209; If satisfy CurrentFer＞MaxFer, turn to step 207; If satisfy CurrentFer＜MinFer, turn to step 205;
205, judge that whether the complementary channel velocity CurrentRate of current foundation is less than consulting maximum rate MaxRate, if then turn to step 206, if not then turning to step 209;
206, the next time application speed RequestRate that sets up FSCH also just is equivalent to speed is promoted one times at the CurrentRate first-rate that rises, and becomes original 2 times;
207, judge that whether the complementary channel velocity CurrentRate of current foundation is greater than the minimum-rate MinRate that allows, if then turn to step 208, if not then turning to step 209;
208, first-rate falls in the next time application speed RequestRate that sets up FSCH on CurrentRate, also just is equivalent to speed is reduced half, becomes original half;
209, scheduling application is next time set up FSCH speed RequestRate to keep CurrentRate constant.
It is constant that the present invention keeps the speed of forward complement channel in frame error rate maintains permissible range the time; When too high and speed did not drop to the minimum-rate of permission when frame error rate, the base station will reduce the speed of the forward complement channel of less important foundation down; Cross low and speed when not reaching maximum when frame error rate, the speed of the forward complement channel of less important foundation down will be improved in the base station.Make the high-speed data downloading service of CDMA2000 after the adjustment by above-mentioned speed under the prerequisite that guarantees low frame error rate, improve message transmission rate as much as possible, reach the making full use of of channel, and satisfy the requirement of user simultaneously speed and quality.
The forward complement channel of above-mentioned each scheduling application can also can be realized by the discontinuously dispatching application by scheduling application realization continuously.So-called continuous scheduling is meant during transmission article one forward complement channel, initiates the request of forward complement channel next time, and is at interval not free to realize between two forward complement channels, reduces the time delay of scheduling; So-called discontinuously dispatching is meant after the transfer of data in article one forward complement channel is intact, just initiate the request of forward complement channel next time, bigger scheduling time delay is so just arranged, in Chinese patent application 200310112108.1, introduced the specific implementation process of continuous scheduling.When once needing data quantity transmitted bigger, and resource of this scheduling application is can't finish this transfer of data the time, if adopt discontinuously dispatching will cause repeatedly allocated channel continually, increased the processing expenditure of channel configuration, also increased the time delay of forward complement channel, can cause limited waste of network resources, so general the employing dispatched application continuously.
But scheduling does not need terminal to send PMRM message to the base station continuously, as long as terminal transmission better will be in continuous scheduling and not report PMRM message always, just may be under the lower situation of speed because be in continuous scheduling always, terminal does not report PMRM message, cause transmission rate to improve according to current PMRM message, this is just need use discontinuously dispatching instead, makes terminal can report PMRM message, thus realize forward complementary channel velocity can make full use of resource.
Influence terminal in order to make the present invention can not be in continuous dispatch state always and report PMRM message to the base station, the present invention also needs a scheduling method control flow, its principle is as follows: the base station judges that the time or the number of times of scheduling surpass a threshold value to FSCH continuously, if next scheduling still is continuous scheduling, must dispatch continuously and change discontinuously dispatching into, so that terminal to report PMRM message.The conversion and control of scheduling and discontinuously dispatching mainly may further comprise the steps continuously:
Step 1: the number of times or the time of scheduling is continuously added up in the base station when FSCH dispatches continuously;
Step 2: the base station judges that the base station is dispatched the next one continuously and changed to discontinuously dispatching after continuous scheduling times or time surpass preset threshold value.
Below in conjunction with Fig. 3 this scheduling method control flow is done detailed description:
301, the request message of FSCH is set up in the base station request of receiving;
302, the base station judges whether this request message is continuous scheduling flow, if then turn to step 303, if not then turning to step 306;
303, the number of times or the time of the continuous scheduling of base station statistics;
304, the number of times of scheduling continuously or time are judged greater than preset threshold value in the base station whether, if greater than preset threshold value then turn to step 305, otherwise turn to step 306;
305, the scheduling that continuous scheduling flow is handled FSCH is carried out in the base station;
306, the scheduling of discontinuously dispatching flow processing FSCH is carried out in the base station.
Added after the control of above-mentioned scheduling flow, can avoid behind the reduction of speed terminal transmission to be in always better that continuous scheduling does not report PMRM and can not raising speed.After if wireless environment variation, base station report the frame error rate reduction of speed according to PMRM, the FSCH of low rate transmission situation is fine, can be in continuous scheduling always; After wireless environment improved, FSCH can still be in continuous scheduling and can't report PMRM message; After surpassing certain threshold values, the one-time continuous scheduling is interrupted in the base station, so that allow radio receiver report PMRM message; After PMRM is received in the base station, then can whether can raising speed according to current frame error rate situation decision scheduling next time; Be used for avoiding speed " to keep dropping "! Generally speaking, transmit under the good situation, can be in continuous scheduling always; Transmit under the bad situation, can often be in discontinuously dispatching, scheduling can not report PMRM message continuously, and discontinuously dispatching just can report PMRM message; So when the wireless environment variation, can be with reference to PMRM reduction of speed rate, when wireless environment improved, the base station must forced interruption be dispatched continuously, so that radio receiver reports PMRM message, realized speed-raising.
The execution that cooperatively interacts of flow process by Fig. 2 and Fig. 3, the speed domination algorithm of forward complement channel of the present invention can be optimized the speed of the forward complement channel in the CDMA2000 system, allow the user under the prerequisite that guarantees transmission quality, improve speed of download as much as possible, realize optimal control downloading rate in the high-speed data downloading service.
Claims (4)
1. the velocity allocating algorithm of a forward complement channel is characterized in that: may further comprise the steps:
(1) obtain the maximum rate of the forward complement channel of service negotiation in the call establishment, the minimum-rate of permission, and the target frame error rate of different rates forward complement channel, the higher limit of frame error rate and the lower limit of frame error rate;
(2) obtain the current frame error rate of the forward complement channel of this use between base station and the terminal;
(3) in the current frame error rate of the forward complement channel of described this use lower limit less than described frame error rate, and the forward complementary channel velocity of current foundation is during less than described maximum rate, and next time, the speed of the forward complement channel that the scheduling application is set up improved a grade at least on the basis of the forward complementary channel velocity of described current foundation; Greater than the forward complementary channel velocity of the higher limit of described frame error rate and current foundation during greater than described minimum-rate, next time, the speed of the forward complement channel that the scheduling application is set up reduced a grade at least on the basis of the forward complementary channel velocity of described current foundation in the current frame error rate of the forward complement channel of described this use.
2. according to the velocity allocating algorithm of the described forward complement channel of claim 1, it is characterized in that: described step (2) is specially:
(21) base station sends Extended Supplemental Channel Assignment Message to terminal;
(22) terminal is received Extended Supplemental Channel Assignment Message, reports Power Measurement Report Message to the base station after current forward complement channel finishing scheduling;
(23) the current frame error rate of forward complement channel is calculated in the base station according to the Power Measurement Report Message of receiving.
3. according to the velocity allocating algorithm of claim 1 or 2 described forward complement channels, it is characterized in that: described step (3) also comprises the steps: when the time overtime threshold value of continuously scheduling or when scheduling times surpasses frequency threshold value continuously afterwards, the base station with the next one continuously scheduling use the scheduling that discontinuously dispatching carries out forward complement channel instead.
4. according to the velocity allocating algorithm of the described forward complement channel of claim 3, it is characterized in that: described time threshold or frequency threshold value are by base station sets.
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| KR20020058616A (en) * | 2000-12-30 | 2002-07-12 | 엘지전자 주식회사 | Method for controlling supplemental channel in is-95c 1x system |
| KR20040014796A (en) * | 2002-08-12 | 2004-02-18 | 엘지전자 주식회사 | Outer loop power control method in reverse link |
| CN1852547A (en) * | 2005-11-11 | 2006-10-25 | 华为技术有限公司 | Carrier frequency scheduling method for data business |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20020058616A (en) * | 2000-12-30 | 2002-07-12 | 엘지전자 주식회사 | Method for controlling supplemental channel in is-95c 1x system |
| KR20040014796A (en) * | 2002-08-12 | 2004-02-18 | 엘지전자 주식회사 | Outer loop power control method in reverse link |
| CN1852547A (en) * | 2005-11-11 | 2006-10-25 | 华为技术有限公司 | Carrier frequency scheduling method for data business |
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