CN102595595B - CQI adjusting method based on position information and base station - Google Patents
CQI adjusting method based on position information and base station Download PDFInfo
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- CN102595595B CN102595595B CN201210073247.7A CN201210073247A CN102595595B CN 102595595 B CN102595595 B CN 102595595B CN 201210073247 A CN201210073247 A CN 201210073247A CN 102595595 B CN102595595 B CN 102595595B
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- travelling carriage
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Abstract
A CQI (Channel Quality Indicator) adjusting method based on position information and a base station belong to the technical field of wireless communication. The base station partitions the covering area firstly, determines the reference CQI corresponding to each partitioned small area according to specific rules, and saves each small area and the reference CQI corresponding to each small area; then position information of a mobile station is predicted in scheduling time according to the obtained position information of the mobile station, the small area where the mobile station is positioned in the time can be determined according to position information of the mobile station in scheduling time, and the reference CQI corresponding to small area that the mobile station is positioned in scheduling time is determined by finding each saved small area and the reference CQI corresponding to each saved small area; and finally, the reference CQI corresponding to small area that the mobile station is positioned in scheduling time can be adjusted according to the number of acknowledgment signals or disacknowledgment signals. The feedback overhead and the complexity of the mobile station are reduced, and the matching with a real channel environment can be ensured at the same time.
Description
Technical field
The CQI method of adjustment and the base station that the present invention relates to a kind of position-based information, belong to wireless communication technology field.
Background technology
In cell mobile communication systems, in order to meet growing Packet Service demand, especially downlink business demand, 3GPP has introduced HSDPA (High Speed Downlink Packet Access, high speed downlink packet access) technology in R5 standard.HSDPA is by adopting AMC (Adaptive Modulation and Coding, adaptive modulation and coding), HARQ (Hybrid Automatic Repeat Request, mixed automatic retransfer request) and the technology such as high order modulation, thereby the variation of quick self-adapted subscriber channel, improves transmission rate and throughput of system.
Wherein AMC adjusts code rate and modulation system adaptively according to channel condition in fact exactly.In the time that channel condition is good, select high efficiency code modulating method, to improve transmission rate; In the time of bad channel conditions, select inefficient code modulating method, to guarantee communication quality.AMC process comprises: first, base station sends Downlink Control Information by HS-SCCH (High Speed Shared Control Channel, High-Speed Shared Control Channel) to travelling carriage; Then, travelling carriage is measured the channel quality of eating dishes without rice or wine of current reception data after receiving this Downlink Control Information, produces a CQI, and this CQI is fed back to base station according to the channel of measuring; Finally, first base station is adjusted the CQI of travelling carriage feedback, then distributes corresponding resource according to the CQI after adjusting, and notifies mobile station resources distribution condition, and then travelling carriage is carried out to the scheduling of next round.
In prior art, travelling carriage needs first channel quality to be measured, produce accordingly again a CQI and feed back to base station, then base station is adjusted according to the CQI of travelling carriage feedback again, visible, in said method, travelling carriage needs independent measurement channel quality and feeds back CQI information, has increased the complexity of feedback overhead and travelling carriage.
Summary of the invention
The invention provides a kind of CQI method of adjustment and base station of position-based information, need independent measurement channel quality and feed back CQI information to solve travelling carriage in prior art, the problem that causes the complexity of feedback overhead and travelling carriage to increase, the present invention adopts following technical scheme for this reason:
The embodiment of the present invention provides a kind of CQI method of adjustment of position-based information, comprising:
Base station is divided the region of its covering according to the distribution of signal strength in overlay area, and determines and divide corresponding benchmark CQI in rear each zonule according to specific rule, preserves each zonule and its corresponding benchmark CQI;
Base station dopes the positional information of travelling carriage described in the scheduling moment according to the positional information of the travelling carriage that obtains, determine the zonule at described scheduling moment travelling carriage place according to the positional information of described scheduling moment travelling carriage;
Benchmark CQI corresponding to each zonule that base station lookups is preserved, determines described benchmark CQI corresponding to zonule that dispatches moment travelling carriage place;
The number of the confirmation signal that feed back according to travelling carriage base station or not confirmation signal is adjusted the benchmark CQI corresponding to zonule at described scheduling moment travelling carriage place.
The embodiment of the present invention also provides a kind of base station, comprising:
Divide module, for the region of its covering being divided according to the distribution of signal strength in overlay area;
Benchmark CQI determination module, determines and divides corresponding benchmark CQI in rear each zonule for the specific rule of basis;
Preserve module, divide each zonule of Module Division and the benchmark CQI determination module definite benchmark CQI corresponding with it for preserving;
Position acquisition prediction module, the positional information of obtaining for the positional information obtained according to travelling carriage current time and a upper moment dopes the positional information of travelling carriage described in the scheduling moment, determines the zonule at described scheduling moment travelling carriage place according to the positional information of described scheduling moment travelling carriage;
Search determination module, preserve for searching each zonule and its corresponding benchmark CQI that module is preserved, thereby determine the benchmark CQI corresponding to zonule at described scheduling moment travelling carriage place;
Adjusting module, for according to the confirmation signal of travelling carriage feedback or not the number of confirmation signal the benchmark CQI corresponding to zonule at the described scheduling moment travelling carriage place of searching determination module and determining adjusted.
Benchmark CQI is determined according to the positional information of travelling carriage in the base station that embodiment of the present invention provides, travelling carriage is without channel quality being measured again and being fed back CQI information, reduce the complexity of feedback overhead and travelling carriage, the confirmation signal simultaneously feeding back according to travelling carriage or the not number of confirmation signal are finely tuned this benchmark CQI, guarantee and the mating of real channel environment, thereby greatly improved base station and carry out according to CQI the efficiency of scheduling of resource.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic flow sheet of the CQI method of adjustment of a kind of position-based information of the present invention;
Fig. 2 is the structural representation of a kind of base station of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
In the technical scheme of the CQI method of adjustment of a kind of position-based information providing in embodiment of the present invention, as shown in Figure 1, comprising:
11, base station is divided the region of its covering according to the distribution of signal strength in overlay area, and determines and divide corresponding benchmark CQI in rear each zonule according to specific rule, preserves each zonule and its corresponding benchmark CQI.
As optionally, base station can be divided the region of its covering according to the data of the distribution map of signal strength in overlay area and actual measurement.And set up the database of the each zonule benchmark CQI corresponding with it after dividing, after general division, in each zonule, the benchmark CQI of correspondence determines by actual measurement or emulation the CQI that makes throughput of system maximum after described division in each zonule.Specifically can be as shown in table 1:
| Area information | Corresponding benchmark CQI |
| Region 1 | 25 |
| Region 2 | 10 |
Table 1
12, base station dopes the positional information of travelling carriage described in the scheduling moment according to the positional information of the travelling carriage that obtains, determines the zonule at described scheduling moment travelling carriage place according to the positional information of described scheduling moment travelling carriage.
As optionally, base station can obtain based on cellular localization mode the positional information of travelling carriage, the positional information of GPS (global positioning system) acquisition of information travelling carriage that can also be based on travelling carriage feedback.
Particularly, speed and the moving direction of travelling carriage can be determined according to the moment of positional information of the positional information of the positional information of the travelling carriage last time obtaining, current time travelling carriage and the travelling carriage last time obtaining and the time interval of current time in base station, thereby dope the positional information of travelling carriage described in the scheduling moment.For example base station is successively at t
1the positional information that moment gets travelling carriage is Pt
1(x, y), at t
2the positional information that moment gets travelling carriage is Pt
2(x, y), at t
3the positional information that moment gets travelling carriage is Pt
3(x, y), current time is t
3in the moment, the positional information of the travelling carriage that base station basis was last time obtained is at t
2the Pt that moment gets
2the positional information Pt of (x, y), current time travelling carriage
3(x, y) and the time interval are (t
3-t
2) determine moving direction and the speed of travelling carriage, thus dope the positional information of travelling carriage described in the scheduling moment.Further, the zonule (for example region 1) at described scheduling moment travelling carriage place is determined in base station according to the positional information of predetermined scheduling moment travelling carriage.
13, each zonule that base station lookups is preserved and its corresponding benchmark CQI table, determine described benchmark CQI corresponding to zonule that dispatches moment travelling carriage place.For example, the benchmark CQI value that can determine region 1 correspondence by look-up table 1 is 25.
The number of the confirmation signal that 14, feed back according to travelling carriage base station or not confirmation signal is adjusted the benchmark CQI corresponding to zonule at described scheduling moment travelling carriage place.
Particularly, be 1 if travelling carriage feeds back the not number of confirmation signal, benchmark CQI corresponding to zonule that adjusts described travelling carriage place subtracts 1; If the accumulative total number of travelling carriage feedback acknowledgment signal reaches predetermined value, benchmark CQI corresponding to zonule that adjusts described travelling carriage place adds 1; If the continuous number of travelling carriage feedback acknowledgment signal reaches predetermined value, benchmark CQI corresponding to zonule that adjusts described travelling carriage place adds 2; Described predetermined value is definite according to actual requirement, and concrete predetermined value N can be expressed as: N=(1-BLER
target)/BLER
target, wherein BLER
targetthe target error rate of expression system.
Be much better than benchmark CQI because the continuous number of travelling carriage feedback acknowledgment signal reaches predetermined value explanation actual channel quality, add 2 therefore need to adjust benchmark CQI corresponding to the zonule at described travelling carriage place.If but a certain moment actual channel quality is far short of what is expected more than benchmark CQI, thus need to be in the time that travelling carriage feed back that the continuous number of confirmation signal does not reach threshold value, and adjustment CQI is initial value; Or, to adjust CQI according to the signal-to-noise ratio (SNR) estimation of channel and adopt the CQI value of travelling carriage feedback to dispatch, this threshold value determines according to actual requirement or practical operation experience is determined.
A kind of base station that the specific embodiment of the present invention provides, as shown in Figure 2, comprising:
Benchmark CQI determination module 22, determines and divides corresponding benchmark CQI in rear each zonule for the specific rule of basis.After general division, in each zonule, the benchmark CQI of correspondence determines by actual measurement or emulation the CQI that makes throughput of system maximum after described division in each zonule.
Position acquisition prediction module 24, for dope the positional information of travelling carriage described in the scheduling moment according to the positional information of the travelling carriage that obtains, determines the zonule at described scheduling moment travelling carriage place according to the positional information of described scheduling moment travelling carriage;
As optionally, base station can obtain based on cellular localization mode the positional information of travelling carriage, the positional information of GPS (global positioning system) acquisition of information travelling carriage that can also travelling carriage feedback.
Particularly, speed and the moving direction of travelling carriage can be determined according to the moment of positional information of the positional information of the positional information of the travelling carriage last time obtaining, current time travelling carriage and the travelling carriage last time obtaining and the time interval of current time in base station, thereby dope the positional information of travelling carriage described in the scheduling moment.
Adjusting module 26, for according to the confirmation signal of travelling carriage feedback or not the number of confirmation signal the benchmark CQI corresponding to zonule at the described scheduling moment travelling carriage place of searching determination module 25 and determining adjusted.
Particularly, be 1 if travelling carriage feeds back the not number of confirmation signal, benchmark CQI corresponding to zonule that adjusts described travelling carriage place subtracts 1; If the accumulative total number of travelling carriage feedback acknowledgment signal reaches predetermined value, benchmark CQI corresponding to zonule that adjusts described travelling carriage place adds 1; If the continuous number of travelling carriage feedback acknowledgment signal reaches predetermined value, benchmark CQI corresponding to zonule that adjusts described travelling carriage place adds 2; Described predetermined value is definite according to actual requirement, and concrete predetermined value N can be expressed as: N=(1-BLER
target)/BLER
target, wherein BLER
targetthe target error rate of expression system.
Be much better than benchmark CQI because the continuous number of travelling carriage feedback acknowledgment signal reaches predetermined value explanation actual channel quality, add 2 therefore need to adjust benchmark CQI corresponding to the zonule at described travelling carriage place.If but a certain moment actual channel quality is far short of what is expected more than benchmark CQI, thus need to be in the time that travelling carriage feed back that the continuous number of confirmation signal does not reach threshold value, and adjustment CQI is initial value; Or, to adjust CQI according to the signal-to-noise ratio (SNR) estimation of channel and adopt the CQI value of travelling carriage feedback to dispatch, this threshold value determines according to actual requirement or practical operation experience is determined.
The specific implementation of the processing capacity of the each module comprising in above-mentioned base station is described in embodiment of the method before, is no longer repeated in this description at this.
It should be noted that in above-mentioned whole base station embodiment, included modules is just divided according to function logic, but be not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional module also, just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
In addition, one of ordinary skill in the art will appreciate that all or part of step realizing in above-mentioned each embodiment of the method is can carry out the hardware that instruction is relevant by program to complete, corresponding program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
Benchmark CQI is determined according to the positional information of travelling carriage in the base station that embodiment of the present invention provides, travelling carriage is without channel quality being measured again and being fed back CQI information, reduce the complexity of feedback overhead and travelling carriage, the confirmation signal simultaneously feeding back according to travelling carriage or the not number of confirmation signal are finely tuned this benchmark CQI, guarantee and the mating of real channel environment, thereby greatly improved base station and carry out according to CQI the efficiency of scheduling of resource.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the embodiment of the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (8)
1. a CQI method of adjustment for position-based information, is characterized in that, comprising:
Base station is divided the region of its covering according to the distribution of signal strength in overlay area, and determines and divide corresponding benchmark CQI in rear each zonule according to specific rule, preserves each zonule and its corresponding benchmark CQI;
Base station dopes the positional information of travelling carriage described in the scheduling moment according to the positional information of the travelling carriage that obtains, determine the zonule at described scheduling moment travelling carriage place according to the positional information of described scheduling moment travelling carriage;
Each zonule that base station lookups is preserved and its corresponding benchmark CQI determine the benchmark CQI corresponding to zonule at described scheduling moment travelling carriage place;
The number of the confirmation signal that feed back according to travelling carriage base station or not confirmation signal is adjusted the benchmark CQI corresponding to zonule at described scheduling moment travelling carriage place;
The specific rule of described basis is determined corresponding benchmark CQI in the rear each zonule of division, comprising:
Determine the CQI that makes throughput of system maximum after described division in each zonule by actual measurement or emulation, and using this maximum CQI corresponding benchmark CQI in each zonule after described division.
2. method according to claim 1, is characterized in that, described base station dopes the positional information of travelling carriage described in the scheduling moment according to the positional information of the travelling carriage obtaining, comprising:
Speed and the moving direction of travelling carriage are determined according to the moment of positional information and the time interval of current time of the positional information of the positional information of the travelling carriage that last time obtained, current time travelling carriage and the travelling carriage that last time obtained in base station, thereby dope the positional information of dispatching travelling carriage described in the moment.
3. method according to claim 1, is characterized in that, the confirmation signal that feed back according to travelling carriage described base station or the not number of confirmation signal are adjusted benchmark CQI corresponding to the zonule at described travelling carriage place, comprising:
If it is 1 that travelling carriage feeds back the not number of confirmation signal, benchmark CQI corresponding to zonule that adjusts described travelling carriage place subtracts 1; If the accumulative total number of travelling carriage feedback acknowledgment signal reaches predetermined value, benchmark CQI corresponding to zonule that adjusts described travelling carriage place adds 1; If the continuous number of travelling carriage feedback acknowledgment signal reaches predetermined value, benchmark CQI corresponding to zonule that adjusts described travelling carriage place adds 2; Described predetermined value is determined according to actual requirement.
4. method according to claim 3, is characterized in that, also comprises:
If travelling carriage feeds back when the continuous number of confirmation signal does not reach threshold value, adjusting CQI is initial value; Or, adjust CQI according to the signal-to-noise ratio (SNR) estimation of channel.
5. a base station, is characterized in that, comprising:
Divide module, for the region of its covering being divided according to the distribution of signal strength in overlay area;
Benchmark CQI determination module, determines and divides corresponding benchmark CQI in rear each zonule for the specific rule of basis;
Preserve module, divide each zonule of Module Division and the benchmark CQI determination module definite benchmark CQI corresponding with it for preserving;
Position acquisition prediction module, for dope the positional information of travelling carriage described in the scheduling moment according to the positional information of the travelling carriage that obtains, determines the zonule at described scheduling moment travelling carriage place according to the positional information of described scheduling moment travelling carriage;
Search determination module, each zonule and its corresponding benchmark CQI of preserving module preservation for searching determine described benchmark CQI corresponding to zonule that dispatches moment travelling carriage place;
Adjusting module, for according to the confirmation signal of travelling carriage feedback or not the number of confirmation signal the benchmark CQI corresponding to zonule at the described scheduling moment travelling carriage place of searching determination module and determining adjusted;
Described benchmark CQI determination module, specifically for determine the CQI that makes throughput of system maximum after described division in each zonule by actual measurement or emulation, and using this maximum CQI corresponding benchmark CQI in each zonule after described division.
6. base station according to claim 5, it is characterized in that, described position acquisition prediction module, specifically for determining speed and the moving direction of travelling carriage according to the moment of positional information and the time interval of current time of the positional information of the positional information of the travelling carriage that last time obtained, current time travelling carriage and the travelling carriage that last time obtained, thereby dope the positional information of dispatching travelling carriage described in the moment.
7. base station according to claim 5, is characterized in that, described adjusting module is 1 if feed back the not number of confirmation signal specifically for travelling carriage, and benchmark CQI corresponding to zonule that adjusts described travelling carriage place subtracts 1; If the accumulative total number of travelling carriage feedback acknowledgment signal reaches predetermined value, benchmark CQI corresponding to zonule that adjusts described travelling carriage place adds 1; If the continuous number of travelling carriage feedback acknowledgment signal reaches predetermined value, benchmark CQI corresponding to zonule that adjusts described travelling carriage place adds 2; Described predetermined value is determined according to actual requirement.
8. base station according to claim 7, is characterized in that, described adjusting module, if while also feeding back for travelling carriage that the continuous number of confirmation signal does not reach threshold value, adjusting CQI is initial value; Or, adjust CQI according to the signal-to-noise ratio (SNR) estimation of channel.
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| CN101414893A (en) * | 2007-10-16 | 2009-04-22 | 大唐移动通信设备有限公司 | Method and system for correcting channel quality indication |
| CN101686117A (en) * | 2008-09-24 | 2010-03-31 | 大唐移动通信设备有限公司 | Method and device for user equipment (UE) to feed back data stream under multi-streaming transmission mode |
| CN102118198A (en) * | 2009-12-31 | 2011-07-06 | 中兴通讯股份有限公司 | System and method for enabling terminals to feed back broadband channel quality indications |
| EP2369771A1 (en) * | 2005-08-24 | 2011-09-28 | Interdigital Technology Corporation | Method and apparatus for adjusting channel quality indicator feedback period to increase uplink capacity |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2369771A1 (en) * | 2005-08-24 | 2011-09-28 | Interdigital Technology Corporation | Method and apparatus for adjusting channel quality indicator feedback period to increase uplink capacity |
| CN101414893A (en) * | 2007-10-16 | 2009-04-22 | 大唐移动通信设备有限公司 | Method and system for correcting channel quality indication |
| CN101686117A (en) * | 2008-09-24 | 2010-03-31 | 大唐移动通信设备有限公司 | Method and device for user equipment (UE) to feed back data stream under multi-streaming transmission mode |
| CN102118198A (en) * | 2009-12-31 | 2011-07-06 | 中兴通讯股份有限公司 | System and method for enabling terminals to feed back broadband channel quality indications |
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