CN102413476B - Dynamic combination and allocation method of CRB (Cognitive Resource Block) resource in cognitive LTE (Long-Term Evolution) system - Google Patents
Dynamic combination and allocation method of CRB (Cognitive Resource Block) resource in cognitive LTE (Long-Term Evolution) system Download PDFInfo
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- CN102413476B CN102413476B CN201210001642.4A CN201210001642A CN102413476B CN 102413476 B CN102413476 B CN 102413476B CN 201210001642 A CN201210001642 A CN 201210001642A CN 102413476 B CN102413476 B CN 102413476B
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Abstract
The invention discloses a dynamic combination and allocation method of CRB (Cognitive Resource Block) resource in a cognitive LTE (long-term evolution) system. The method comprises the specific operation steps of: firstly, detecting a broadband frequency spectrum in a current wireless condition by all cognitive terminals distributed in a cell controlled by a base station so as to form frequency spectrum measurement reports; secondly, collecting all the frequency spectrum measurement reports on all the cognitive terminals by the base station so that a plurality of available subcarriers are formed by an available frequency spectrum through carrier processing; thirdly, numbering and sequencing subcarrier information, and dynamically selecting a plurality of subcarrier combinations by the base station to form the CRB resource; and finally, dynamically allocating the CRB resource to each cognitive terminal by the base station according to the service request sent by multiple cognitive terminals to the base station. With the adoption of the dynamic combination and allocation method of CRB resource in the cognitive LTE system, the available frequency spectrum hole resource in the cognitive LTE system can be fully mined, and the CRB resources are dynamically combined as required from two dimensionalities of time and frequency; and therefore, a technical support is provided for efficiently using time-frequency resources in the cognitive LTE system.
Description
Technical field
The invention belongs to communication technical field, further relate to dynamic combined and the distribution method of cognitive resources piece (Cognitive Resource Block, CRB) resource in a kind of cognitive Long Term Evolution (Long-Term Evolution, LTE) system.The present invention is directed in cognitive Long Term Evolution LTE system towards different service types, dynamic combined and the distribution method of cognitive resources piece CRB resource are flexibly proposed, meet the demand of different service types running time-frequency resource.The present invention can fully excavate available frequency spectrum cavity-pocket resource in cognitive Long Term Evolution LTE system, is combined as CRB resource from time and two dimension dynamic on-demands of frequency, for efficiently utilizing the running time-frequency resource in cognitive Long Term Evolution LTE system that technical support is provided.
Background technology
In Long Term Evolution LTE system, mainly adopted orthogonal frequency division multiplexi (Orthogonal Frequency Division Multiplex, OFDM).In frequency domain, given channel is divided into a plurality of orthogonal sub-carriers, on each subcarrier, is adjusted to respectively signal, and individual subcarrier parallel transmission.In Long Term Evolution LTE system, because resource occurs with time and frequency two dimension, therefore, it is very complicated that resource management and distribution method become, when especially usable spectrum bandwidth is larger, should consider the flexibility that resource is distributed, consider again the requirements such as size of coherence bandwidth.Long Term Evolution LTE system regulation, subframe length is in time 1ms, two equal time slots, consists of, the time span of each time slot is 0.5ms.A Resource Unit contains an OFDM symbol, and its resource representation method is a definition basic Resource Block (Resource Block, RB), then with Resource Block RBWei unit, carries out resource distribution.OFDMA technology (OFDM Access, OFDMA), to develop on the basis of OFDM technology, that a kind of OFDM of utilization technology is carried out after subcarrier channel, on each subcarrier, load the multiple access technique of transmission data, the good subcarrier of each user's selective channel condition transmits, and can obtain the diversity gain in frequency.
In current Long Term Evolution LTE system, adopt the resource allocation mechanism of OFDMA very flexible, can take suitable mode dynamic assignment number of subcarriers according to user's actual conditions.In recent years because cognitive radio technology can obtain current mandate frequency spectrum temporary transient no frequency spectrum cavity-pocket in time or frequency by cognitive radio environment, by the mode of selecting a good opportunity, realize dynamic spectrum access, therefore, can effectively improve current spectrum utilization efficiency and efficiently guarantee QoS of customer.The object of the LTE system that studies for a long period of time is better demand and the more application that meets future wireless system market.The real-time dynamic change of mobile communications network, and along with the introducing of the equipment such as micro-base station, femto base station relay station and Home eNodeB causes bringing severe challenge for the LTE system management that studies for a long period of time.Internal system minizone meets interference between distribution, frequency resource, power resource and system etc. all in continuous variation, therefore operator strengthens day by day for the control and management energy difficulty of base station, therefore wish by introducing cognitive radio technology, form cognitive Long Term Evolution LTE system.In cognitive Long Term Evolution LTE system, according to network practical operation situation, can adaptive adjustment network parameter, optimize allocation of resources and cut operating costs and manual intervention.Therefore, there is self-configuring, self-optimization function cognitive techniques writes in LTE standard, give the more awareness of network itself, independence and intelligent.
In cognition wireless network, utilizable frequency spectrum is all discontinuous in time and frequency, there is isomerism in the frequency spectrum that can recycle that is usually said a plurality of cognitive terminal perception gained, therefore, according in traditional Long Term Evolution LTE system for the combination of Resource Block RB with distribute thinking, can realize the best of breed of frequency spectrum resource in time and frequency in cognitive Long Term Evolution LTE system, form cognitive resources piece CRB resource, for solving towards the resource request of different service types and the service quality of the efficient cognitive terminal of assurance, there is absolute attraction.Yet, current in for cognitive Long Term Evolution LTE systematic research process, especially investigate in the dynamic self-adapting management and assigning process of cognitive resources piece CRB resource, still lack for the dynamic combined of cognitive resources piece CRB resource and the research of distribution method.
The patent application document of ZTE Co., Ltd " for the method to Resource Block by resource unit mapping of long evolving system " (publication number CN 101399761A, application number 200710162604.6, applying date 2007.09.27) disclose that a kind of subcarrier based on fixing distributes, for the method to Resource Block by resource unit mapping of long evolving system.The method can realize data to the mapping of physical sub-carrier.The deficiency that the method exists is that all subcarriers in long evolving system are fixed allocation, lack flexibility, are not suitable for Dynamic Resource Allocation for Multimedia in cognitive LTE system.
The patent application document of Xingheliangdian Communication Software Co Ltd, Beijing (the publication number CN 102098679A that " utilizes cognitive techniques to reduce the method for LTE wireless communication system area interference ", application number 201110030375.9, applying date 2011.01.27) disclose and a kind ofly based on newly adding access customer, adopt cognitive techniques independently to select usable spectrum resource to reduce the method for LTE wireless communication system area interference.The availability of frequency spectrum of effective improvement system when the method can improve the service quality of Cell Edge User.The deficiency that the method exists is that only the reduction LTE wireless communication system area interference based on cognitive techniques in the realization of frequency spectrum category, can not further optimize resource utilization from time dimension.Above-mentioned two methods all can not provide the cognitive resources piece CRB dynamic composition method of resource according to type of service flexibly in addition, can not be that cognitive terminal dynamic assignment has the cognitive resources piece CRB resource that meets its performance requirement according to type of service.
Summary of the invention
The object of the invention is to, for above-mentioned prior art deficiency, propose dynamic combined and the distribution method of CRB resource in a kind of cognitive LTE system.The present invention is directed in cognitive LTE system towards multiple business type, propose dynamic combined and the distribution method of cognitive resources piece CRB resource flexibly, meet the demand of different service types running time-frequency resource.The present invention can fully excavate available frequency spectrum cavity-pocket resource in cognitive Long Term Evolution LTE system, is combined as CRB resource from time and two dimension dynamic on-demands of frequency, for efficiently utilizing the running time-frequency resource in cognitive Long Term Evolution LTE system that technical support is provided.
The concrete thought that the present invention realizes above-mentioned purpose is, first, the all cognitive terminal that are distributed in the community of controlling base station detect the broader frequency spectrum in current wireless environment, and through base station information processing module, analysis obtains the current spectrum utilization state information detecting, and form spectrum measurement report; Then, base station is collected the spectrum measurement that all cognitive terminal report and has been reported that usable spectrum carries out subcarrier processing, realizes usable spectrum carrier wave and turns to a plurality of available subcarriers; Subsequently, base station to subcarrier information be numbered, sequence and a plurality of subcarrier combination of choice of dynamical form cognitive resources piece CRB resource; Finally, the service request that send to base station according to a plurality of cognitive terminal base station, dynamically for each cognitive terminal is distributed cognitive resources piece CRB resource.
The concrete steps of the inventive method comprise as follows:
Dynamic combined and the distribution method of CRB resource in cognitive LTE system, its step comprises as follows:
(1) cognitive terminal spectrum measurement
The all cognitive terminal that are distributed in the community of controlling base station detect the broader frequency spectrum in current wireless environment, through base station information processing module, analysis obtains the current spectrum utilization state information detecting, the report of formation spectrum measurement, cognitive terminal reports spectrum measurement report to base station;
(2) usable spectrum carrier waveization is processed
2a) the spectrum measurement report that all cognitive terminal report is collected in base station, obtain the data message of corresponding perception gained usable spectrum information, adopt carrier wave rule to carry out subcarrier processing to usable spectrum, realize usable spectrum carrier wave and turn to a plurality of available subcarriers;
2b) base station adopts time-frequency two-dimensional array to store successively available subcarrier information;
(3) CRB resource dynamic combination
3a) subcarrier information of cognitive resources piece CRB resource dynamic polymerization is extracted in base station, according to subcarrier number method, time-frequency two-dimensional array is carried out to subcarrier number according to row vector frequency with according to the column vector time;
3b) data statistics is carried out for the service request in current area in base station, community requested service is divided into delay sensitive business or bandwidth sensitive type of service, according to community requested service type, complete time-frequency two-dimensional array sort, more the time-frequency two-dimensional array after new sort;
3c) base station is according to current area practical business type, and the time-frequency two-dimensional array choice of dynamical from upgrading meets a plurality of subcarriers of traffic carrying capacity request, and a plurality of subcarrier combination form cognitive resources piece CRB resource;
(4) CRB resource dynamic is distributed
The service request that send to base station according to a plurality of cognitive terminal base station, dynamically for each cognitive terminal is distributed cognitive resources piece CRB resource.
The present invention compared with prior art has the following advantages
The first, the subcarrier the present invention is directed in current LTE system is fixed allocation, lacks flexibility problem, proposes dynamic combined and the distribution method of CRB resource in cognitive LTE system, meets the demand of different service types.
The second, the present invention fully excavates frequency spectrum cavity-pocket resource available in LTE system, is combined as CRB resource from time and two dimension dynamic on-demands of frequency, for efficiently utilizing the running time-frequency resource in cognitive LTE system that technical support is provided.
The 3rd, in the cognitive LTE system that the present invention proposes, the dynamic combined of CRB resource and distribution method have the flexibility of height, can obtain concrete type of service according to base station, realize cognitive resources piece CRB resource dynamic as required and distribute.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention;
Fig. 2 is time-frequency two-dimensional array schematic diagram of the present invention;
Fig. 3 is cognitive resources piece CRB resource dynamic combination flow chart of the present invention;
Fig. 4 is cognitive resources piece CRB resource dynamic allocation flow figure of the present invention.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in detail.
With reference to accompanying drawing 1, the present invention will be further described.
The all cognitive terminal that are distributed in the community of controlling base station detect the broader frequency spectrum in current wireless environment, through base station information processing module, analysis obtains the current spectrum utilization state information detecting, formation can characterize the actual parameter of the broader frequency spectrum that cognitive terminal detects, can reflect the spectrum measurement report of the data message of usable spectrum information, cognitive terminal reports spectrum measurement to report to base station.
Step 2, usable spectrum carrier waveization is processed
The spectrum measurement report that all cognitive terminal report is collected in base station, obtains the data message of corresponding perception gained usable spectrum information, adopts carrier wave rule to carry out subcarrier processing to usable spectrum, realizes usable spectrum carrier wave and turns to a plurality of available subcarriers.Carrier wave rule specifically refers within the scope of the time-frequency of Long Term Evolution LTE standard, dynamic random ground bulk usable spectrum resource division be a plurality of subcarriers or dynamic random fritter frequency spectrum carrier aggregation, be a plurality of subcarriers, realize the operation that usable spectrum carrier wave turns to a plurality of available subcarriers; A plurality of number of subcarriers are to be obtained by usable spectrum resource size and each the subcarrier size ratio round numbers according to the time-frequency scope dictates of Long Term Evolution LTE standard.Usable spectrum carrier wave turns to after many available subcarriers, base station adopts time-frequency two-dimensional array sign and stores many available subcarrier information, if accompanying drawing 2 is time-frequency two-dimensional array schematic diagram of the present invention, its abscissa is that row vector frequency and ordinate are the column vector time.In usable spectrum carrier wave processing procedure, the dynamic random subcarrier polymeric rule within the scope of the time-frequency of Long Term Evolution LTE standard, comprises the processing of bulk frequency spectrum carrier wave or fritter frequency spectrum carrier aggregation.It is minimum T that the time-frequency scope of Long Term Evolution LTE standard can be defined as time range
minbe T to the maximum
max; Frequency range is minimum F
minwith maximum F
maxtime-frequency scope.Then, base station adopts the cognitive terminal perception gained usable spectrum information by cognitive Long Term Evolution LTE system intermediate frequency spectrum resource distribution diverse geographic location in community, and the time-frequency two-dimensional array that the recorded information in time and frequency dimension forms is stored available subcarrier information successively.
Step 3, the combination of CRB resource dynamic
The subcarrier information of cognitive resources piece CRB resource dynamic polymerization is extracted in base station, according to subcarrier number method, time-frequency two-dimensional array is carried out to subcarrier number according to row vector frequency with according to the column vector time.Subcarrier number method, as accompanying drawing 2, is according to frequency from low to high, for described available subcarrier increases successively and is numbered k=1 since 1 ...., K or according to the time from small to large order, for described available subcarrier increases successively and is numbered s=1 since 1 ...., S.The CRB of cognitive resources piece shown in accompanying drawing 3 resource dynamic combination process, data statistics is carried out for the service request in current area in base station, community requested service is divided into delay sensitive business or bandwidth sensitive type of service, according to community requested service type, complete time-frequency two-dimensional array sort, more the time-frequency two-dimensional array after new sort.Concrete sort method is according to the column vector time of the time-frequency two-dimensional array after subcarrier number or row vector frequency, to sort respectively according to current area practical business type difference, if specifically practical business type in current area is delay sensitive business, the time-frequency two-dimensional array of base station after to subcarrier number, according to the ascending sequence of carrying out subcarrier number of column vector time.If current area practical business type is bandwidth sensitive business, the time-frequency two-dimensional array of base station after to subcarrier number, carries out the sequence of subcarrier number from low to high according to row vector frequency.Finally, base station is according to current area practical business type, and the time-frequency two-dimensional array choice of dynamical from upgrading meets a plurality of subcarriers of traffic carrying capacity request, and a plurality of subcarrier combination form cognitive resources piece CRB resource.Subcarrier choosing method is if current area practical business type is delay sensitive business herein, base station, from according in ascending time-frequency two-dimensional array of carrying out subcarrier number sequence of column vector time, is chosen subcarrier number and is formed the cognitive resources piece CRB resource with delay character.If current area practical business type is bandwidth sensitive business, base station, from carrying out from low to high in the time-frequency two-dimensional array subcarrier number sequence according to row vector frequency, is chosen subcarrier number and is formed the cognitive resources piece CRB resource with bandwidth characteristic.
Step 4, CRB resource dynamic is distributed
Accompanying drawing 4 is described cognitive resources piece CRB resource dynamic allocation flow, and the service request that send to base station according to a plurality of cognitive terminal base station, dynamically for each cognitive terminal is distributed cognitive resources piece CRB resource.Resource Block CRB resource allocation methods is if the service request that cognitive terminal is sent to base station is delay sensitive business, and base station has the cognitive resources piece CRB resource of delay character for its distribution.If the service request that cognitive terminal is sent to base station is bandwidth sensitive business, base station has the cognitive resources piece CRB resource of bandwidth characteristic for its distribution.
Claims (7)
1. dynamic combined and the distribution method of CRB resource in cognitive LTE system, its step comprises as follows:
(1) cognitive terminal spectrum measurement
The all cognitive terminal that are distributed in the community of controlling base station detect the broader frequency spectrum in current wireless environment, processing module analysis through base station information obtains the current spectrum utilization state information detecting, the report of formation spectrum measurement, cognitive terminal reports spectrum measurement report to base station;
(2) usable spectrum carrier waveization is processed
2a) the spectrum measurement report that all cognitive terminal report is collected in base station, obtain the data message of corresponding perception gained usable spectrum information, adopt carrier wave rule to carry out subcarrier processing to usable spectrum, realize usable spectrum carrier wave and turn to a plurality of available subcarriers;
2b) base station adopts time-frequency two-dimensional array to store successively available subcarrier information;
(3) CRB resource dynamic combination
3a) subcarrier information of cognitive resources piece CRB resource dynamic polymerization is extracted in base station, according to subcarrier number method, time-frequency two-dimensional array is carried out to subcarrier number according to row vector frequency with according to the column vector time;
3b) data statistics is carried out for the service request in current area in base station, community requested service is divided into delay sensitive business or bandwidth sensitive type of service, according to community requested service type, complete time-frequency two-dimensional array sort, more the time-frequency two-dimensional array after new sort;
3c) base station is according to current area practical business type, and the time-frequency two-dimensional array choice of dynamical from upgrading meets a plurality of subcarriers of traffic carrying capacity request, and a plurality of subcarrier combination form cognitive resources piece CRB resource;
Described subcarrier choosing method is:
If current area practical business type is delay sensitive business, base station, from according in ascending time-frequency two-dimensional array of carrying out subcarrier number sequence of column vector time, is chosen subcarrier number and is formed the cognitive resources piece CRB resource with delay character;
If current area practical business type is bandwidth sensitive business, base station, from carrying out from low to high in the time-frequency two-dimensional array subcarrier number sequence according to row vector frequency, is chosen subcarrier number and is formed the cognitive resources piece CRB resource with bandwidth characteristic;
(4) CRB resource dynamic is distributed
The service request that send to base station according to a plurality of cognitive terminal base station, dynamically for each cognitive terminal is distributed cognitive resources piece CRB resource.
2. dynamic combined and the distribution method of CRB resource in a kind of cognitive LTE system according to claim 1, it is characterized in that, the spectrum measurement report that step (1) is described, comprise the actual parameter that can characterize the broader frequency spectrum that cognitive terminal detects, can reflect the data message of usable spectrum information.
3. dynamic combined and the distribution method of CRB resource in a kind of cognitive LTE system according to claim 1, it is characterized in that, step 2a) described carrier wave rule refers within the scope of the time-frequency of Long Term Evolution LTE standard, dynamic random ground bulk usable spectrum resource division be a plurality of subcarriers or dynamic random fritter frequency spectrum carrier aggregation, be a plurality of subcarriers, realize the operation that usable spectrum carrier wave turns to a plurality of available subcarriers; A plurality of number of subcarriers are to be obtained by usable spectrum resource size and each the subcarrier size ratio round numbers according to the time-frequency scope dictates of Long Term Evolution LTE standard.
4. dynamic combined and the distribution method of CRB resource in a kind of cognitive LTE system according to claim 1, it is characterized in that, the time-frequency two-dimensional array that step (2b) is described, be the cognitive terminal perception gained usable spectrum information by cognitive Long Term Evolution LTE system intermediate frequency spectrum resource distribution diverse geographic location in community, the recorded information in time and frequency dimension forms.
5. dynamic combined and the distribution method of CRB resource in a kind of cognitive LTE system according to claim 1, is characterized in that step 3a) described subcarrier number method is:
According to frequency from low to high, for described available subcarrier increases numbering successively since 1;
According to the time from small to large order, for described available subcarrier increases numbering successively since 1.
6. dynamic combined and the distribution method of CRB resource in a kind of cognitive LTE system according to claim 1, is characterized in that step 3b) described sort method is:
If current area practical business type is delay sensitive business, the time-frequency two-dimensional array of base station after to subcarrier number, according to the ascending sequence of carrying out subcarrier number of column vector time;
If current area practical business type is bandwidth sensitive business, the time-frequency two-dimensional array of base station after to subcarrier number, carries out the sequence of subcarrier number from low to high according to row vector frequency.
7. dynamic combined and the distribution method of CRB resource in a kind of cognitive LTE system according to claim 1, is characterized in that, the described Resource Block CRB of step (4) resource allocation methods is,
If the service request that cognitive terminal is sent to base station is delay sensitive business, base station has the cognitive resources piece CRB resource of delay character for its distribution;
If the service request that cognitive terminal is sent to base station is bandwidth sensitive business, base station has the cognitive resources piece CRB resource of bandwidth characteristic for its distribution.
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| CN102984810A (en) * | 2012-11-12 | 2013-03-20 | 东南大学 | Centralized-control-free satellite information channel dynamic access method |
| CN105636072A (en) * | 2014-10-31 | 2016-06-01 | 中国移动通信集团公司 | Method and device for detecting frequency spectrum resource, terminal and base station |
| WO2016189893A1 (en) * | 2015-05-22 | 2016-12-01 | 株式会社Ｎｔｔドコモ | User device |
| CN106413120B (en) | 2015-07-31 | 2021-09-21 | 华为技术有限公司 | Data sending method, device and system |
| WO2018145269A1 (en) * | 2017-02-08 | 2018-08-16 | 广东欧珀移动通信有限公司 | Service transmission method, terminal and network device |
| CN108738024A (en) * | 2017-04-18 | 2018-11-02 | 中国移动通信有限公司研究院 | A kind of method, apparatus and network for realizing that frequency spectrum is backsetted |
| CN115374188B (en) * | 2022-10-24 | 2023-01-31 | 沐曦科技(成都)有限公司 | Resource state query method and device, electronic equipment and storage medium |
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| CN101621846B (en) * | 2008-07-01 | 2012-10-10 | 中兴通讯股份有限公司 | Frequency spectrum resource classification and division method |
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