CN100464608C - Method for confirming scheduling priority and scheduling method - Google Patents
Method for confirming scheduling priority and scheduling method Download PDFInfo
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- CN100464608C CN100464608C CNB2006100984434A CN200610098443A CN100464608C CN 100464608 C CN100464608 C CN 100464608C CN B2006100984434 A CNB2006100984434 A CN B2006100984434A CN 200610098443 A CN200610098443 A CN 200610098443A CN 100464608 C CN100464608 C CN 100464608C
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Abstract
The invention discloses an affirming method of dispatching priority grade, which affirms dispatching priority grade for base station according to terminal reported channel quality indication and terminal real transmission velocity. The invention also provides a dispatching method, which comprises the following steps: a. affirming dispatching priority grade for base station according to terminal reported channel quality indication and terminal real transmission velocity; b. distributing resource to user through base station from high to low sequence to finish dispatching. The invention is convenient to realize dispatching course based on fair algorithm.
Description
Technical field
The present invention relates to communication technique field, relate in particular to a kind of high speed downlink packet and insert (High SpeedDownlink Packet Access, HSDPA) method and the dispatching method of definite dispatching priority in the system.
Background technology
HSDPA is Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, WCDMA) enhancing aspect wireless transmission and evolution, in the HSDPA system, in order to improve the mobile packet data transmittability, select suitable dispatching algorithm to dispatch and to play important effect.
Dispatching algorithm commonly used in the current HSDPA system mainly contains three kinds: max carrier to interference algorithm (Maximum Carrier to Interference, Max C/I), repeating query algorithm (Round Robin, RR) and the direct ratio fair algorithm (Proportional Fair, PF).
Wherein the max carrier to interference algorithm is the method for according to the max carrier to interference measured value user being dispatched fully with a kind of, and the bad terminal of channel quality might can not get scheduling forever, so its fairness is non-constant; The repeating query algorithm is the algorithm that equates scheduling time to each terminal in the sub-district fully, thus the most fair going up from the time time, but it does not consider the channel quality status of different terminals fully, so throughput of system is minimum, wastes very much resource; The direct ratio fair algorithm is a kind ofly to have considered that promptly throughput of system considered the algorithm of fairness again, below we will introduce the direct ratio fair algorithm in detail.
The direct ratio fair algorithm all distributes a corresponding dispatching priority for each terminal in the sub-district, according to the height of dispatching priority terminal is dispatched Resources allocation then.
The formula that the direct ratio fair algorithm calculates dispatching priority is:
Wherein (C/I) (t) refers to that terminal is at t carrier/interface ratio (Carrier to Interference constantly, C/I), carrier/interface ratio is Carrier interference ratio, has embodied the relative scale of useful signal and interference, terminal has bigger carrier/interface ratio, represents that promptly this terminal has the good channel transmission conditions.λ (t) refers to the transmission quantity of this terminal in the time period that with t is ending constantly, i.e. the actual transmission rate of this terminal, and this time period is the time period of the regular length reserved in advance in advance.
The length of above-mentioned time period also has strict requirement in the direct ratio fair algorithm, because the intensity of wireless signal can change along with the variation of time or position, this variation might be very slow, be called as slow fading, also might be very quick, be called as rapid fading, if the curtailment that the time period is chosen is to cover the process of a rapid fading, calculate λ (t) value so and will not possess representativeness, so the length of time period generally will be enough to cover the rapid fading variation in the direct ratio fair algorithm, but oversize also is not all right, and oversize will not possess real-time.
The direct ratio fair algorithm is a molecule (t) with (C/I), under the identical situation of the λ of all terminals (t), carrier/interface ratio is higher be the Channel Transmission condition preferably terminal can obtain higher dispatching priority, the preferential acquisition served, improved throughput of system, simultaneously because the length of above-mentioned time period will be much larger than dispatching cycle, when terminal repeatedly obtains dispatch service, λ (t) as denominator can become big gradually, the dispatching priority of this terminal also can corresponding step-down, those are served up to acquisition owing to cause C/I relative will the uprising of dispatching priority of very low terminal always away from base station or other reasons like this.
Wait for that in to the sub-district when terminal of serving was dispatched, the most important standard of measurement dispatching algorithm was exactly: throughput of system and fairness.As seen from the above description, the direct ratio fair algorithm is a kind of when improving throughput of system as far as possible, guarantee the dispatching algorithm that all terminals are rationally served, and from for a long time, all users can obtain service under the state preferably at channel quality, can obtain comparatively similar speed, have taken into account throughput of system and fairness preferably, Here it is in the HSDPA system, more more options direct ratio fair algorithm reason that terminal is dispatched.
But need terminal that down channel is measured owing to obtain the C/I value, feed back to NodeB by certain approach again, uplink demodulation decoding module by NodeB receives, reinform the downlink coding modulation module, whole acquisition process is very complicated, be not easy to operation, cause the method for in the direct ratio fair algorithm, determining dispatching priority also very complicated, be not easy to realize.
Dispatching method based on the direct ratio fair algorithm is: give the terminal distribution resource successively according to dispatching priority order from high to low after determining dispatching priority, terminal is dispatched.
Based on the dispatching method of direct ratio fair algorithm, same owing to determine the C/I value of dispatching priority, acquisition process is very complicated, is not easy to operation, and becomes complicated, and is not easy to realize.
Summary of the invention
The technical problem to be solved in the present invention provides method and the dispatching method of determining dispatching priority in a kind of convenient high speed descending grouping access system that is easy to realize.
In order to reach the foregoing invention purpose, the invention provides the method for determining dispatching priority in a kind of high speed descending grouping access system, this method comprises:
The base station obtains the channel quality indication and the actual transmission rate of terminal of terminal to report;
The base station is inquired about the corresponding transmission block size of acquisition according to channel quality indication and terminal capability grade to the channel quality indication map form;
The transmission block size that obtains according to inquiry is determined the obtained speed of terminal; With the ratio of the obtained speed of terminal and the actual transmission rate of terminal dispatching priority as terminal.
Wherein, this method also comprises: by simulation result to the channel quality indication map form of truncation phenomenon there being, fictionalizing the transmission block size that can reflect different channels quality indication.
Wherein, described base station is inquired about the corresponding transmission block size of acquisition to the channel quality indication map form and is comprised according to channel quality indication and terminal capability grade:
Indicate according to channel quality the base station, is that 10 channel quality indication map form is inquired about and obtained corresponding transmission block size to ability rating.
Wherein, described base station is inquired about the corresponding transmission block size of acquisition to the channel quality indication map form and is comprised according to channel quality indication and terminal capability grade:
By simulation result, construct a channel quality indication map form that is fit to all ability ratings and all channel qualities indication distribution;
Indicate according to channel quality the base station, described channel quality indication map form is inquired about obtaining corresponding transmission block size.
The present invention also provides the dispatching method in a kind of high speed descending grouping access system,, this method comprises:
A, base station obtain the channel quality indication and the actual transmission rate of terminal of terminal to report;
The base station is inquired about the corresponding transmission block size of acquisition according to channel quality indication and terminal capability grade to the channel quality indication map form;
The transmission block size that obtains according to inquiry is determined the obtained speed of terminal; With the ratio of the obtained speed of terminal and the actual transmission rate of terminal dispatching priority as terminal;
User resource allocation is given successively according to dispatching priority order from high to low in b, base station, finishes scheduling.
Wherein, described base station is inquired about the corresponding transmission block size of acquisition to the channel quality indication map form and is comprised according to channel quality indication and terminal capability grade:
Indicate according to channel quality the base station, is that 10 channel quality indication map form is inquired about and obtained corresponding transmission block size to ability rating.
Because the channel quality indication map form that in the high speed descending grouping access system agreement, defines, embodied the corresponding relation of channel quality indication and transmission block size, and the transmission block size has directly determined the scheduling rates to terminal, so we can calculate the obtained speed of terminal by the transmission block size, the obtained speed of terminal is the terminal theoretical momentary rate that can obtain under current C QI corresponding channel quality just, indicate compared with channel quality, it is a value that more can truly reflect the terminal transmission ability, can obtain speed alternate channel quality indication calculating dispatching priority so use, obviously difference that more can the reactive terminal transmittability, transmittability is best, the higher terminal of speed can be obtained and more dispatcher meeting will be obtained, promoted throughput of system, and can guarantee better that all terminals are rationally served, and have taken into account fairness; Dispatch according to this dispatching priority, also more rational Resources allocation, the elevator system throughput has better fairness.
Description of drawings
Dispatching method system diagram in Fig. 1, the high speed descending grouping access system;
Embodiment one flow chart of Fig. 2, dispatching method of the present invention;
Embodiment two flow charts of Fig. 3, dispatching method of the present invention.
Embodiment
The invention provides method and the dispatching method of determining dispatching priority in a kind of high speed descending grouping access system, this method is utilized the channel quality indication that is very easy to acquisition in the HSDPA system, and (ChannelQuality Indicator CQI) makes the method for determining direct ratio fair algorithm dispatching priority and the dispatching method that adopts the direct ratio fair algorithm be easy to more realize.
Dispatching method in the high speed descending grouping access system is applicable to system as shown in Figure 1, this system comprises base station 101 and (N+1) individual terminal 102, share the cell transmission resource owing in the HSDPA system, be connected to the terminal of same sub-district, in order reasonably transfer resource to be distributed to cell terminal, just need dispatch Resources allocation according to certain algorithm to the terminal that needs in the sub-district to serve.
In the HSDPA system, terminal all can be at special physical controlling channel of upward (DedicatedPhysical Control Channel for HS-DSCH every 2ms, HS-DPCCH) the measured value CQI of last reporting channel quality, what CQI equally reflected with C/I is the quality of terminal channel transmission quality, both physical meaning are of equal value substantially, so use the CQI value to substitute the direct ratio fair algorithm of original C/I value, its effect does not change fully, and the result who uses this direct ratio fair algorithm to dispatch also can be basic identical with the result of the direct ratio fair algorithm that uses the C/I value.
The method embodiment one of definite dispatching priority provided by the invention is direct use CQI value and substitutes the dispatching priority that original C/I value is determined the direct ratio fair algorithm, and particular content is as described below:
The base station obtains the CQI value and the actual transmission rate λ of terminal (t) of terminal to report;
Pass through formula:
Calculate the dispatching priority of terminal.
The method embodiment two of definite dispatching priority provided by the invention obtains corresponding transmission block size (Transport Block Size TBSize), determines the dispatching priority of direct ratio fair algorithm for search CQI mapping form according to the CQI value.
Because the scheduling rates of terminal depends on the size of transmission block, and the transmission block size is determined by CQI, its corresponding relation is recorded on the CQI mapping form of agreement regulation, therefore we can be by knowing terminal CQI value, search CQI mapping form and obtain TBSize, calculate the scheduling rates of theoretic terminal, i.e. the obtained speed of terminal is utilized can obtain speedometer and calculate dispatching priority then.
The CQI mapping form of above-mentioned agreement regulation, according to the different ability ratings of the hardware case decision terminal of terminal, corresponding then different ability ratings have defined different CQI mapping forms; In use, different manufacturers can be optimized according to the CQI mapping form of actual conditions to the agreement regulation.
Determine the method embodiment two of dispatching priority, the specific implementation method is as described below:
The base station obtains the CQI value and the actual transmission rate λ of terminal (t) of terminal to report;
Search CQI mapping form according to CQI value and terminal capability grade, obtain corresponding TBSize;
Now illustrate the process of searching TBSize: two ability ratings CQI value that has been all 12 terminal to report is arranged, and NodeB knows that the CQI value of terminal A distributes near 15, and the CQI value of terminal B distributes near 14; Search terminal capability grade as shown in table 1 and be 12 CQI mapping form, the TBSize that can obtain terminal A is 3319, and the TBSize of terminal B is 2583.
Table 1, terminal capability grade are 12 CQI mapping form
The TBSize that obtains with inquiry calculates the obtained speed R (cqi) of terminal, the terminal theoretical momentary rate that under current C QI corresponding channel quality, can obtain just, and computing formula is:
R(cqi)＝TBSize/2ms
Utilize R (cqi) and λ (t) to calculate the dispatching priority of terminal then, computing formula is:
In the above-mentioned example of searching TBSize, terminal A that obtains by tabling look-up and the TBSize value of terminal B can obtain, the obtained speed ratio of terminal A and terminal B is 3319:2583=1.28:1, and the CQI that is not equal to both compares 15:14=1.07:1, as seen but the quality of channel quality does not reflect the terminal transmittability fully really, TBSize directly determines the obtained speed of terminal, use TBSize to carry out dispatching priority so and calculate obviously more reasonably Resources allocation, have better fairness.
Simultaneously, we have also seen a kind of phenomenon by table 1, when the CQI of terminal surpasses 15, the situation that TBSize reaches the upper limit can occur, are 15 to CQI to be that the TBSize of the terminal correspondence 30 is 3319 from CQI promptly, and this situation is called as truncation.In this case, even the terminal channel environment is good again, CQI is that 30 terminal can not send than CQI is 15 the bigger transmission block of terminal, for instance: if terminal A reports CQI is 16, it is 30 that terminal B reports CQI, they will obtain identical dispatching priority, and when dispatching, the terminal B that channel condition is good can't be by priority scheduling like this.
Because in practical operation, all there is the phenomenon of truncation in the CQI mapping form of a lot of different ability rating correspondences, the present invention has provided a kind of execution mode, fictionalizes the corresponding TBSize value that can reflect different CQI by simulation result, to eliminate the influence that truncation brings.Still be example with table 1, both fictionalized the TBSize value of CQI in 15 to 30 scopes by simulation result, these TBSize values can reflect different CQI, when tabling look-up, both values that CQI finds in 15 to 30 scopes the time for fictionalizing, the influence of having avoided truncation to bring.
Simultaneously, belong to different ability ratings if wait for the terminal of scheduling, NodeB need search different mapping forms, could to obtain TBSize separately, to search flow process in order simplifying, the present invention also provides a kind of embodiment, result by emulation, construct a CQI mapping form that is fit to all ability ratings and all CQI distribution, the terminal of all ability ratings all obtains TBSize by searching this form, carries out the scheduling based on the direct ratio fair algorithm.
Moreover, CQI mapping form owing to the different ability ratings that provide from agreement, we can think that the mapping form of other ability ratings all is that ability rating is a subclass of 10 mapping form, and it CQI can not occur and increase the situation that TBSize but no longer increases, and this mapping form is as shown in table 2.
Table 2, terminal capability grade are 10 CQI mapping form
The method embodiment three of definite dispatching priority provided by the invention both for unified inquiry terminal ability rating is that 10 CQI mapping form obtains corresponding TBSize, determined the dispatching priority in the direct ratio fair algorithm.
The base station obtains the CQI value and the actual transmission rate λ of terminal (t) of terminal to report;
Searching the terminal capability grade according to the CQI value is 10 CQI mapping form, obtains corresponding TBSize;
The TBSize that obtains with inquiry calculates the obtained speed R (cqi) of terminal, the terminal theoretical momentary rate that under current C QI corresponding channel quality, can obtain just, and computing formula is:
R(cqi)＝TBSize/2ms
Utilize R (cqi) and λ (t) to calculate the dispatching priority of terminal then, computing formula is:
Method embodiment one with respect to determining dispatching priority the invention provides the dispatching method embodiment one in the high speed descending grouping access system, the direct dispatching priority by CQI value calculating direct ratio fair algorithm, idiographic flow as shown in Figure 2:
Step 201, terminal report the CQI value at up channel.
Step 202, NodeB obtain the CQI value of terminal to report.
Step 203, NodeB calculate the dispatching priority that all wait for service terminal by the terminal CQI value of obtaining, and sort according to the dispatching priority size;
Wherein the dispatching priority computing formula is:
Step 204, NodeB give the terminal distribution resource successively according to dispatching priority order from high to low, and terminal is dispatched, and until resource exhaustion, flow process finishes.
In the HSDPA system, dispatching method based on the direct ratio fair algorithm uses CQI to calculate dispatching priority according to above-mentioned formula, under the CQI of each terminal value distributes similar situation, can obtain higher system throughput and fairness, the molecule CQI (t) that is dispatching priority has determined in the good terminal of certain instantaneous channel quality higher dispatching priority is arranged, and the chance of priority scheduling is arranged; And denominator λ (t) has guaranteed that certain fairness is arranged between each terminal, and the terminal that promptly can not get for a long time dispatching is understood the lifting dispatching priority, increases the chance that is scheduled.From general effect, similar if the CQI of each terminal distributes, can obtain similar average scheduling rates, guaranteed fairness.
With respect to the method embodiment two that determines dispatching priority, among the dispatching method embodiment two in the high speed descending grouping access system provided by the invention, the direct ratio fair algorithm is searched CQI mapping form according to the CQI value and is obtained corresponding TBSize, calculates dispatching priority.
This embodiment flow process as shown in Figure 3, detailed process is as follows:
The search procedure of the method embodiment two of search procedure and definite dispatching priority is in full accord.
Wherein R (cqi) is the theoretical momentary rate that terminal can obtain under current C QI corresponding channel quality, just can obtain speed, and computing formula is:
R(cqi)＝TBSize/2ms
So also we can say: dispatching priority=(TBSize/2ms)/λ (t)
With respect to the method embodiment three that determines dispatching priority, dispatching method embodiment three in the high speed descending grouping access system provided by the invention, both, carried out method based on the scheduling of direct ratio fair algorithm for unified inquiry terminal ability rating is that 10 CQI mapping form obtains corresponding TBSize.
This embodiment two that implements idiographic flow and dispatching method is basic identical, flow chart also can be with reference to figure 3, and difference only is, when proceeding to step 302, only searching the terminal capability grade according to the CQI value that reports is 10 CQI mapping form, obtains the TBSize of correspondence.
More than the dispatching method in a kind of high speed descending grouping access system provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. determine the method for dispatching priority in the high speed descending grouping access system, it is characterized in that this method comprises:
The base station obtains the channel quality indication and the actual transmission rate of terminal of terminal to report;
The base station is inquired about the corresponding transmission block size of acquisition according to channel quality indication and terminal capability grade to the channel quality indication map form;
The transmission block size that obtains according to inquiry is determined the obtained speed of terminal; With the ratio of the obtained speed of terminal and the actual transmission rate of terminal dispatching priority as terminal.
2. the method for definite dispatching priority as claimed in claim 1 is characterized in that, this method also comprises: by simulation result to the channel quality indication map form of truncation phenomenon there being, fictionalizing the transmission block size that can reflect different channels quality indication.
3. the method for definite dispatching priority as claimed in claim 1 is characterized in that, described base station is inquired about the corresponding transmission block size of acquisition to the channel quality indication map form and comprised according to channel quality indication and terminal capability grade:
Indicate according to channel quality the base station, is that 10 channel quality indication map form is inquired about and obtained corresponding transmission block size to ability rating.
4. the method for definite dispatching priority as claimed in claim 1 is characterized in that, described base station is inquired about the corresponding transmission block size of acquisition to the channel quality indication map form and comprised according to channel quality indication and terminal capability grade:
By simulation result, construct a channel quality indication map form that is fit to all ability ratings and all channel qualities indication distribution;
Indicate according to channel quality the base station, described channel quality indication map form is inquired about obtaining corresponding transmission block size.
5. the dispatching method in the high speed descending grouping access system is characterized in that this method comprises:
A, base station obtain the channel quality indication and the actual transmission rate of terminal of terminal to report;
The base station is inquired about the corresponding transmission block size of acquisition according to channel quality indication and terminal capability grade to the channel quality indication map form;
The transmission block size that obtains according to inquiry is determined the obtained speed of terminal; With the ratio of the obtained speed of terminal and the actual transmission rate of terminal dispatching priority as terminal;
User resource allocation is given successively according to dispatching priority order from high to low in b, base station, finishes scheduling.
6. dispatching method as claimed in claim 5 is characterized in that, described base station is inquired about the corresponding transmission block size of acquisition to the channel quality indication map form and comprised according to channel quality indication and terminal capability grade:
Indicate according to channel quality the base station, is that 10 channel quality indication map form is inquired about and obtained corresponding transmission block size to ability rating.
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| CN101242653B (en) * | 2008-01-30 | 2011-07-20 | 华为技术有限公司 | Access control method and device |
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| CN101272542B (en) * | 2008-05-07 | 2012-09-05 | 中兴通讯股份有限公司 | HSDPA scheduling method in communication system |
| CN101309460B (en) | 2008-07-14 | 2011-04-20 | 华为技术有限公司 | Method and apparatus for resource distribution between multiple users |
| CN101465808B (en) * | 2008-12-30 | 2012-02-22 | 华为技术有限公司 | Method, device and system for controlling network PRI |
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