CN101754376A - Method for allocating downlink resources of a orthogonal frequency division multiplexing system - Google Patents
Method for allocating downlink resources of a orthogonal frequency division multiplexing system Download PDFInfo
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- CN101754376A CN101754376A CN200810218227A CN200810218227A CN101754376A CN 101754376 A CN101754376 A CN 101754376A CN 200810218227 A CN200810218227 A CN 200810218227A CN 200810218227 A CN200810218227 A CN 200810218227A CN 101754376 A CN101754376 A CN 101754376A
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Abstract
The invention discloses a method for allocating downlink resources of an orthogonal frequency division multiplexing system, which comprises the steps that: 1) initial value setting: an downward adjustment threshold for decreasing the number of the control channel symbols and an upward adjustment threshold for increasing the number of the control channel symbols are set; the time length of a timer is set; the number of the symbols for the occupation of the initial control channel resources is set; 2) during the operation of the system, statistics are made about the information on the occupation of the control channel resources within the time length of the timer; 3) the number of the symbols for the occupation of the control channel resources is adjusted based on the value about which the statistics are made and the comparison between two thresholds in Step 2) and Step 2) is executed. By predicting the time resources occupied by the downlink control channel based on the historical occupation condition of the downlink control channel and reasonably allocating the proportion of time occupied by the downlink control channel and downlink data channel, the method for allocating downlink resources of the orthogonal frequency division multiplexing system of the invention increases the efficiency of the allocation of downlink resources in the LTE system.
Description
Technical field
The technology of the present invention field relates to OFDM (orthogonal frequency divisionmultiplexing, abbreviation OFDM) distribution method of the downlink resource of system, be particularly related to the method that the downlink resource in Long Term Evolution (Long Term Evolution the is called for short LTE) system distributes.
Background technology
OFDM is mapped to parallel transmission on a plurality of subcarriers as a kind of multi-transceiver technology with serial data stream at a high speed, each subcarrier spectrum quadrature, thus improve spectrum utilization efficiency.LTE is the new generation of wireless mobile communication system, adopt the transmission of key technology realization wireless high-speed datas such as OFDM, adopt the OFDM technology, distribution to resource mainly is the distribution of subcarrier in frequency domain, add the distribution of time resource, thereby form the basic bidimensional Radio Resource of ofdm system, i.e. the resource allocation of time domain and frequency domain.
In the LTE system, the resource of up-downgoing all adopts the central controlled strategy in base station, in each subframe (1ms) cycle, the base station is carried out prioritization and Resources allocation to the terminal request of up-downgoing according to certain strategy, and by the descending control channel terminal that distribution result notice is relevant, descending control channel also takies descending frequency domain and time-domain resource, and down control channel and downstream data channel are time-multiplexed.A period of sub-frame, if the number of users of scheduling is many more, the extra control information that needs is just many more, and the time that down control channel distributes is just many more, symbolic number that control channel takies that corresponding is exactly is many more, in this case just corresponding minimizing of resource that take of data channel.On the contrary, just fewer at the number of users of a subframe scheduling in the time of perhaps will satisfying the demand of some high rate user when base station overall user number is few, especially under the situation of bandwidth ratio broad, the control character number that need this moment is just fewer.When the needed control channel resource of system is fewer, just can redistribute to the more resources of data channel, so just can transmit more downlink data.Otherwise when the needed control channel resource of system is many, need overabsorption to give control channel, with guarantee fairness, the realization of regulation goal such as quality of service.
Present existing dispatching algorithm patent, mainly be at how distributing the data channel resource of time scale under determining, for example how to select different terminals according to certain strategy, to the frequency domain resource of the terminal distribution of each scheduling what etc., the priority selection algorithm that its problem that will solve is a terminal and the allocation algorithm of frequency domain resource, time scale for data channel and control channel concerns the dynamic adjustments algorithm, and patent and pertinent literature do not relate to temporarily at present.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method of ofdm system downlink resource distribution, by the time scale relation of PREDICTIVE CONTROL channel and data channel, brings than higher downlink resource utilance and raising downstream rate.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
The method that a kind of ofdm system downlink resource distributes, this method comprises the steps:
1) setting of initial value:
Set needed two threshold values of prediction: one is the downward adjustment thresholding that reduces the control channel symbolic number, and one is the thresholding that adjusts upward that increases the control channel symbolic number; Interval between two threshold values is exactly the interval of system resource reasonable distribution, and the fluctuation in this is interval does not trigger the modification of control channel resource occupation parameter;
Set timer time length, statistics control channel occupied information in this time cycle is so that relatively make prediction with threshold value;
Set initial control channel resource occupation symbolic number;
2) statistics control channel resource occupation information:
At system's run duration, in timer time length, statistics control channel resource occupation information, occupied information mainly comprises the resource allocation of actual needs and the comparison of control channel resource occupation symbolic number;
3) adjust control channel and take symbolic number:
According to step 2) numerical value of statistics and two thresholdings relatively adjust control channel resource occupation symbolic numbers in the next timer cycle, execution in step 2 in the back).
In the described step 1), also comprise and set minimum symbolic number and the maximum symbolic number that control channel takies.
Described step 2) comprises the steps:
In each period of sub-frame:
I. the value with timer counter adds 1;
Ii. dispatch terminal, the initial control channel resource occupation symbolic number mapping (enum) data channel and the control channel that set according to described step 1);
If the iii. actual control channel symbolic number of using is less than initial control channel resource occupation symbolic number, then the value with control channel resource occupation counter subtracts 1, if the situation of terminal scheduling takes place to abandon because the control channel resource is not enough, then the value with control channel resource occupation counter adds 1, and the value of retentive control channel resource usage count device is constant under other situations;
Iv. whether the value of judging timer counter if then carry out described step 3), otherwise continues to carry out described step 2 more than or equal to timer time length).
Comparison and adjustment that control channel described in the described step 3) takies symbolic number comprise the steps:
If i. the value of control channel resource occupation counter is greater than the thresholding that adjusts upward of control channel symbolic number, and the maximum symbolic number that takies less than the control channel that sets of the symbolic number that takies of control channel, then the symbolic number that control channel is taken adds 1;
If ii. the value of control channel resource occupation counter is less than the downward adjustment thresholding of control channel symbolic number, and the minimum symbolic number that takies greater than the control channel that sets of the symbolic number that takies of control channel, then the symbolic number that control channel is taken subtracts 1;
Iii. restart timer counter;
Iv. reset control channel resource occupation counter.
The method that ofdm system downlink resource of the present invention distributes is based on the Forecasting Methodology of historical information, by setting different threshold values and the time cycle of adjusting the control channel symbolic number, make that the adjustment variance is less, the randomness of effectively level and smooth system run duration, simultaneously can be under the condition that does not influence terminal demodulation performance, time span by the reasonable distribution control channel, thereby improved the service efficiency of downlink resource, and then the total descending throughput in raising sub-district, and algorithm is simple, realizes easily.
Description of drawings
Fig. 1 is a down time-frequency resource schematic diagram;
Fig. 2 is the overview flow chart of the embodiment of the invention;
Fig. 3 is the flow chart of statistics control channel resource occupation information among the present invention;
Fig. 4 adjusts the flow chart that control channel takies symbolic number among the present invention.
Embodiment
The core of the method that ofdm system downlink resource of the present invention distributes is by the shared time resource of prediction down control channel, the time scale of reasonable distribution down control channel and downstream data channel, thus the efficient that downlink resource distributes in the LTE system improved.Forecasting Methodology is based on the historical operating position of down control channel, when the cell terminal number reduces or need the terminal of scheduling to need big flow downstream rate, the situation that the control channel resource occupation reduces all can occur; And more when number of terminals, in order to guarantee scheduling fairness and quality of service, need a period of sub-frame to dispatch more terminal, thereby need the more control channel resource.Fig. 1 is the schematic diagram of LTE down time-frequency resource, as can be seen control channel and data channel proportionate relationship in time.
The present invention adopts the Forecasting Methodology based on historical information, and the control channel resource setting in the next time cycle is adjusted.In this cycle, when the control channel resource of using when reality reaches downward adjustment thresholding less than the ratio of the value of setting, illustrate that the control channel resource of actual needs is less, can reduce the ratio of controlling resource, so that provide more resources to data channel.In this cycle, when the control channel resource needed reaches when adjusting upward thresholding more than the ratio of configured number, illustrate that the control channel resource of actual needs is more, need to increase the ratio of control resource, so that guarantee the realization of goal of dispatching algorithm.And adjust thresholding downwards and adjust upward zone between the thresholding, do not adjust the control channel resource.
Below in conjunction with accompanying drawing embodiments of the invention are further described.
As shown in Figure 2, the method for ofdm system downlink resource distribution of the present invention comprises the steps:
1) the initial value (see figure 2) is set:
It is NUM_SYMBOL_PDCCH that the symbolic number that control channel takies is set;
Setting timer time length is TIMER_NUM_1MS;
It is Threshold_Down that setting control channel symbolic number is adjusted thresholding downwards;
It is Threshold_Up that setting control channel symbolic number adjusts upward thresholding;
Start timer counter T_timer, establish T_timer and equal 0;
It is 0 that control channel resource occupation counter Counter is set;
The minimum symbolic number that the setting control channel takies is MINNUM_SYMBOL_PDCCH;
The maximum symbolic number that the setting control channel takies is MAXNUM_SYMBOL_PDCCH.
2) run duration, statistics control channel resource occupation information (seeing shown in Figure 3):
In each subframe (1ms) cycle
i.T_timer＝T_timer+l；
Ii. dispatch terminal, the NUM_SYMBOL_PDCCH parameter maps data channel and the control channel that set according to step 1);
If the iii. actual control channel symbolic number of using is less than NUM_SYMBOL_PDCCH, Counter=Counter-1 then, if the situation of terminal scheduling takes place to abandon because the control channel resource is not enough, Counter=Counter+1 then, Counter is constant under other situations;
Iv. whether judge T_timer more than or equal to TIMER_NUM_1MS, if execution in step 3 then), otherwise continue execution in step 2).
3) adjust the symbolic number (see figure 4) that control channel takies:
Symbolic number according to historical information prediction next cycle control channel takies, compare Counter and two threshold values:
If i. Counter is greater than Threshold_Up, and NUM_SYMBOL_PDCCH＜MAXNUM_SYMBOL_PDCCH, then NUM_SYMBOL_PDCCH=NUM_SYMBOL_PDCCH+ 1;
If ii. Counter is less than Threshold_Down, and NUM_SYMBOL_PDCCH＞MINNUM_SYMBOL_PDCCH, then NUM_SYMBOL_PDCCH=NUM_SYMBOL_PDCCH-1;
Iii. restart timer counter T_timer, establish T_timer and equal 0;
Iv. resetting control channel resource occupation counter Counter is 0;
V. execution in step 2).
Claims (4)
1. the method that the ofdm system downlink resource distributes is characterized in that this method comprises the steps:
1) setting of initial value:
Set needed two threshold values of prediction: one is the downward adjustment thresholding that reduces the control channel symbolic number, and one is the thresholding that adjusts upward that increases the control channel symbolic number;
Set timer time length;
Set initial control channel resource occupation symbolic number;
2) statistics control channel resource occupation information:
At system's run duration, in timer time length, statistics control channel resource occupation information, occupied information mainly comprises the resource allocation of actual needs and the comparison of control channel resource occupation symbolic number;
3) adjust control channel and take symbolic number:
According to step 2) numerical value of statistics and two thresholdings relatively adjust control channel resource occupation symbolic numbers in the next timer cycle, execution in step 2 in the back).
2. the method that ofdm system downlink resource according to claim 1 distributes is characterized in that: in the described step 1), also comprise and set minimum symbolic number and the maximum symbolic number that control channel takies.
3. the method that ofdm system downlink resource according to claim 2 distributes is characterized in that described step 2) comprise the steps:
In each period of sub-frame:
I. the value with timer counter adds 1;
Ii. dispatch terminal, the initial control channel resource occupation symbolic number mapping (enum) data channel and the control channel that set according to described step 1);
If the iii. actual control channel symbolic number of using is less than initial control channel resource occupation symbolic number, then the value with control channel resource occupation counter subtracts 1, if the situation of terminal scheduling takes place to abandon because the control channel resource is not enough, then the value with control channel resource occupation counter adds 1, and the value of retentive control channel resource usage count device is constant under other situations;
Iv. whether the value of judging timer counter if then carry out described step 3), otherwise continues to carry out described step 2 more than or equal to timer time length).
4. the method that ofdm system downlink resource according to claim 3 distributes is characterized in that comparison and adjustment that control channel described in the described step 3) takies symbolic number comprise the steps:
If i. the value of control channel resource occupation counter is greater than the thresholding that adjusts upward of control channel symbolic number, and the maximum symbolic number that takies less than the control channel that sets of the symbolic number that takies of control channel, then the symbolic number that control channel is taken adds 1;
If ii. the value of control channel resource occupation counter is less than the downward adjustment thresholding of control channel symbolic number, and the minimum symbolic number that takies greater than the control channel that sets of the symbolic number that takies of control channel, then the symbolic number that control channel is taken subtracts 1;
Iii. restart timer counter;
Iv. reset control channel resource occupation counter.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103024908A (en) * | 2011-09-23 | 2013-04-03 | 普天信息技术研究院有限公司 | Method for self-adaptive adjustment on symbol occupation amount of PDCCH (Physical Downlink Control Channel) |
| CN103260241A (en) * | 2012-02-15 | 2013-08-21 | 普天信息技术研究院有限公司 | Time division multiplexing method and time division multiplexing device for physical downlink control channel and physical downlink shared channel |
| CN103916881A (en) * | 2013-01-04 | 2014-07-09 | 中国移动通信集团公司 | Method and device for adjusting packet detection threshold |
| WO2016033962A1 (en) * | 2014-09-05 | 2016-03-10 | 中兴通讯股份有限公司 | Method and device for channel multiplexing |
| WO2017193559A1 (en) * | 2016-05-12 | 2017-11-16 | 华为技术有限公司 | Data transmission method and apparatus |
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| US6219554B1 (en) * | 1998-09-04 | 2001-04-17 | Nortel Networks Limited | System and method of integrating dynamic frequency association with channel borrowing techniques |
| CN101137182B (en) * | 2006-09-01 | 2010-05-12 | 华为技术有限公司 | Resource allocation method and system for wireless communication system |
| CN101291172B (en) * | 2007-04-17 | 2012-12-19 | 电信科学技术研究院 | Method and apparatus for controlling configuration of signed number, updating method and apparatus thereof |
| CN101299630B (en) * | 2007-04-30 | 2012-07-04 | 华为技术有限公司 | Method for scheduling dispersion transmission user, data communication method and net element equipment |
| CN101588632B (en) * | 2009-06-17 | 2011-04-20 | 华为技术有限公司 | Allocation method, device and base station for physical downlink control channel time domain symbolic number |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103024908A (en) * | 2011-09-23 | 2013-04-03 | 普天信息技术研究院有限公司 | Method for self-adaptive adjustment on symbol occupation amount of PDCCH (Physical Downlink Control Channel) |
| CN103024908B (en) * | 2011-09-23 | 2015-07-22 | 普天信息技术研究院有限公司 | Method for self-adaptive adjustment on symbol occupation amount of PDCCH (Physical Downlink Control Channel) |
| CN103260241A (en) * | 2012-02-15 | 2013-08-21 | 普天信息技术研究院有限公司 | Time division multiplexing method and time division multiplexing device for physical downlink control channel and physical downlink shared channel |
| CN103260241B (en) * | 2012-02-15 | 2016-06-15 | 普天信息技术研究院有限公司 | The time-division multiplexing method of down control channel and DSCH Downlink Shared Channel and device |
| CN103916881A (en) * | 2013-01-04 | 2014-07-09 | 中国移动通信集团公司 | Method and device for adjusting packet detection threshold |
| CN103916881B (en) * | 2013-01-04 | 2018-03-23 | 中国移动通信集团公司 | A kind of method and apparatus for adjusting parcel detection threshold |
| WO2016033962A1 (en) * | 2014-09-05 | 2016-03-10 | 中兴通讯股份有限公司 | Method and device for channel multiplexing |
| CN105471561A (en) * | 2014-09-05 | 2016-04-06 | 中兴通讯股份有限公司 | Channel multiplexing method and device |
| WO2017193559A1 (en) * | 2016-05-12 | 2017-11-16 | 华为技术有限公司 | Data transmission method and apparatus |
| US10750530B2 (en) | 2016-05-12 | 2020-08-18 | Huawei Technologies Co., Ltd. | Data transmission method and apparatus |
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Application publication date: 20100623 Assignee: SHENZHEN ZTE MICROELECTRONICS TECHNOLOGY CO., LTD. Assignor: ZTE Corporation Contract record no.: 2015440020319 Denomination of invention: Method for allocating downlink resources of a orthogonal frequency division multiplexing system Granted publication date: 20120606 License type: Common License Record date: 20151123 |
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