CN101056156A - A channel quality feedback method and its user terminal and system - Google Patents
A channel quality feedback method and its user terminal and system Download PDFInfo
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Abstract
The present invention provides a channel quality feedback method and user terminals and a system including a base station and user terminals. The base station also includes a sub-carrier dividing module for dividing the whole frequency band into N sub-bands (N is a positive integral bigger than 1), and a major-minor sub-band allocating module for allocating the main frequency sub-band and the minor frequency sub-band to each cell for communication; the base station communicates with the user terminals according the sub-band division and the allocating information and the base station also includes a determining module of the sub-band using for determining that the user terminal uses at least one of the main frequency sub-band and the minor frequency sub-band; the user terminal also includes a sub-band using information generating module for generating the sub-band using information of the corresponding user terminal and transmitting the information to the a channel quality feedback module for sending back the channel quality information to the base stations according to the sub-band using information.
Description
Technical field
The present invention relates to wireless communication technology, particularly a kind of channel-quality feedback technology in frequency reuse system.
Background technology
Wireless communication system utilizes the geographic area to distinguish usually, and each communication zone in the wireless communication system can be called as a sub-district (cell), for example cellular radio Communication system.
Some multi-transceiver technologies for improving system of broadband wireless communication capacity and spectrum efficiency, developing, its basic thought is that a bandwidth carrier is divided into a plurality of subcarriers, and transmits data simultaneously on a plurality of subcarriers.In the middle of using, require the coherence bandwidth of the width of subcarrier less than system channel, the decline on each subcarrier is a flat fading like this, thereby can reduce intersymbol interference, and does not need complicated channel equalization, is fit to the transmission of high-speed data.Multi-transceiver technology has various ways, as OFDM (OFDM, Orthogonal Frequency Division Multiplexing), CDMA multiple carrier (MC-CDMA, Multicarrier-Code Division Multiple Access), multicarrier is directly expanded CDMA (MC-DS-CDMA, Multicarrier-Direct Sequence-Code Division Multiple Access), multi-tone CDMA (MT-CDMA, Multitone-Code Division Multiple Access), multicarrier TDMA (MC-TDMA, Multicarrier-Time Division Multiple Access), the time-frequency domain two-dimensional expansion, and the multiple expansion technique on above basis.
The OFDM technology is more representational a kind of technology in the multi-transceiver technology, this technology is in frequency domain given channel to be divided into many orthogonal sub-channels, and allow subcarrier spectrum to overlap,, just can isolate data-signal from the subcarrier of aliasing as long as satisfy between subcarrier mutually orthogonally.
For effectively utilizing limited frequency spectrum resources, communication network is usually in different geographical position frequency reuse resources.As shown in Figure 1, for a kind of frequency re-use factor is 1 cellular network channeling schematic diagram, five jiaos of block representation sub-districts, the frequency 1 that grey colour specification is adopted, as shown in the figure, same frequency 1 transmission data are all adopted in each sub-district of this cellular network.Though being 1 multiplexing method, frequency re-use factor can utilize limited frequency spectrum resources well, but for frequency re-use factor 1 network, the user terminal that is in cell edge can be subjected to the interference from its adjacent cell, therefore the signal interference ratio of Cell Edge User terminal can reduce, thus, need to adopt some technology to improve the cell edge signal interference ratio.
And the simplest way of improving the cell edge signal interference ratio increases frequency duplex factor as one exactly, as shown in Figure 2, it for a kind of multiplexing factor 3 cellular network channeling schematic diagram, with frequency partition is three sub-frequencies: frequency 1,2,3, concerning this cellular network, the multiplexing factor 3 can guarantee that the frequency of any two neighbor cells use is all different, is merely able to use 1/3 original frequency but its shortcoming is each sub-district.
Therefore, a kind of frequency soft multiplexing technology for further improving spectrum utilization efficiency, developing, its main thought is: frequency duplex factor as one greater than 1 is adopted in the more serious cell edge area of interference ratio, then adopt 1 frequency duplex factor as one in inside, sub-district.
Specifically as shown in Figure 3, with the multiplexing factor is 3 example, is 3 to divide frequencies with all subcarriers in the multicarrier system according to the multiplexing factor, obtains three boss's carrier waves: dominant frequency 1,2,3, as the clause part among Fig. 3, each sub-district obtains dominant frequency separately; For certain concrete sub-district, the frequency beyond its gained dominant frequency is frequently secondary as it, such as, for sub-district 1,1 the inside just becomes frequently secondary in the sub-district for dominant frequency 2,3, and boss's carrier wave is mainly used in the communication of cell edge, and auxiliary son carrier waves is mainly used in the communication of inside, sub-district.
For avoiding the shortcoming of frequency multiplexing method shown in Figure 2, dominant frequency and secondary transmitting power frequently to need be done some restrictions usually, the transmitting power thresholding that generally is dominant frequency is than secondary transmitting power thresholding height frequently.If dominant frequency is the same with secondary transmitting power frequently, it is 1 that so soft multiplexing just degeneration becomes the multiplexing factor.In addition, from the dominant frequency and secondary frequently the zone of action, the secondary zone of action frequently is to be equivalent to general channeling at 0 o'clock; It is 1 that the secondary zone of action frequently is equivalent to the multiplexing factor when being whole sub-district.
No matter but which kind of frequency multiplexing method is communication system adopt, the decline of wireless channel is frequency selectivity normally, that is to say, at a time, decline on the subcarrier in correlation bandwidth of a certain user terminal can be thought identical, but it is identical that the decline on the farther subcarrier just can not be thought, and the decline of different user terminals is normally different.So, if the decline value of each user terminal on each subcarrier can be known in the base station, so the base station just can based on certain dispatching criterion be different user terminals select as far as possible they separately the reasonable subcarrier of condition transmit data, thereby make that the propagation conditions of most user terminals is all relatively good, realize the multiple users diversity gain, improve spectrum efficiency.Owing to become when decline is, so the distribution of subcarrier need not stop to upgrade so-called a kind of frequency scheduling technology that Here it is.
For realizing the multiple users diversity gain by the scheduling on frequency domain, transmitting terminal just must be known the instantaneous fading value of all user terminals on all subcarriers.For the FDD system, because up-downgoing is at same frequency band, the decline of up-downgoing is different, so receiving terminal must be given transmitting terminal with feedback of channel information by another reverse link.The shared OFDM running time-frequency resource of feedback of channel quality indication all is few more good more, gives user terminal data to reserve running time-frequency resource as much as possible.
Consider that the subcarrier in coherence bandwidth has approximate decline value, therefore some adjacent subcarriers can be divided into a subband, receiving terminal just can be indicated at signal quality of each subband feedback in the regular hour, and needn't feed back at each subcarrier.As shown in Figure 4, for a kind of ofdm system schematic diagram with 16 subcarriers, four adjacent subcarriers are divided into a subband, such one has the ofdm system of 16 subcarriers can be divided into 4 subbands: subband 1, subband 2, subband 3, subband 4.In the regular hour, normally a TTI only needs 4 channel quality indications of feedback to get final product, and promptly feeds back the channel quality of subband 1,2,3,4, and need not to feed back the channel quality of 16 subcarriers, thereby reduce feedback overhead greatly.The width of above-mentioned subband needs the Xiao Yu coherence bandwidth, to obtain multiple users diversity gain preferably.
If user terminal terminal UE (User Equipment) is fed back all subbands, as shown in Figure 5, a kind of channel quality schematic diagram with a certain moment of 12 subbands, 12 subbands shown in the figure, feed back the channel quality of each subband respectively, the details of each subband are just known in the base station so.But for reducing the amount of information of channel-quality feedback, usually can simplify feedback information, such as a kind of Best-M scheme, it is the top-quality M of an indicating channel subband only, as M=4, feedback information top-quality 2/3/4/11 the subband that is numbered of indicating channel only then; For further reducing feedback quantity, may only feed back mean value (the 8+11+9+8)/4=9 of these four sub-band channel quality, rather than feed back four channel quality value respectively.
In frequency soft multiplexing system, generally speaking, user terminal only takies dominant frequency or only takies secondary frequency, rather than takies major-minor simultaneously frequently.At this moment, the channel quality feedback method that is similar to the simplification of Best-M etc. need be done certain optimization at These characteristics.In above-mentioned example, it is better that UE feedback is numbered the channel quality of 2/3/4/11 subband, if being numbered 0/1/2/3 subband is dominant frequency, other subband is frequently secondary, so for the user terminal that takies dominant frequency, it is nonsensical that feedback is numbered 4/11 subband, otherwise can make channel quality feedback information occupied information amount; For taking secondary user terminal frequently, it is nonsensical that feedback is numbered 2/3 subband, otherwise can make channel quality feedback information occupied information amount.
In addition, because the transmitting power of dominant frequency is bigger, interference ratio is less, cause the channel quality of (particularly inside, sub-district) dominant frequency in some zone to be better than secondary channel quality frequently, the channel quality that makes UE always select dominant frequency feeds back, and also can cause system works undesired.
Therefore, it in the above-mentioned described technical scheme amount of information that reduces channel-quality feedback, the simplification feedback information technology that is adopted, may make the feedback information of simplification comprise some garbages or what in particular cases feed back at some is garbage entirely, and can cause system works undesired.
Soft multiplexing similar with said frequencies, can also adopt the method for partial frequency multiplexing, improve spectrum utilization efficiency: frequency duplex factor as one greater than 1 is adopted in the more serious cell edge area of interference ratio, then adopt 1 frequency duplex factor as one in inside, sub-district.
Specifically as shown in Figure 6, be that 3 example illustrates with the multiplexing factor of dominant frequency, the subcarrier in the multicarrier system is divided into 2 parts: dominant frequency and frequently secondary.Concerning the pair frequency, its multiplexing factor is 1; The multiplexing factor of dominant frequency is 3, is about to the dominant frequency part and is divided into three sub-dominant frequency parts again according to the sub-district: sub-dominant frequency 1,2,3, and as the striped part among Fig. 6, each sub-district obtains sub-dominant frequency separately, and identical secondary frequency is adopted in all sub-districts.Sub-dominant frequency is mainly used in the communication of cell edge, the secondary communication that is mainly used in inside, sub-district frequently.
In frequency soft multiplexing about the problem of channel-quality feedback, in partial frequency multiplexing shown in Figure 6, exist equally, may make the feedback information of simplification comprise some garbages or what in particular cases feed back at some is garbage entirely, and can cause system works undesired.
Summary of the invention
Have in view of that, the invention provides a kind of channel quality feedback method and user terminal thereof, system, can make adopt interference coordination technique such as frequency soft multiplexing network normally, work efficiently.
A kind of channel quality feedback method wherein, comprises
Steps A, dividing whole frequency band is N subband, N is the positive integer greater than 1, and is used for the dominant frequency subband and the secondary subband frequently of cell communication for each cell allocation;
Step B determines that user terminal uses dominant frequency subband, secondary subband frequently one of at least;
Step C, user terminal according to its information of using subband respectively to transmitting terminal feedback channel quality information.
A kind of channel-quality feedback system, this system mainly comprises base station and user terminal, this base station further comprises subcarrier division module, major-minor allocation of subbands module, it is N subband that subcarrier is divided the Module Division whole frequency band, N is the positive integer greater than 1, major-minor allocation of subbands module is according to dividing the result is used for cell communication for each cell allocation dominant frequency subband and secondary subband frequently, then base station and user terminal communicate according to above-mentioned sub-band division and assignment information, wherein, the base station comprises that also being used for definite user terminal uses the dominant frequency subband, secondary subband frequently subband one of at least uses determination module, user terminal comprises that also subband uses information-generation module and channel-quality feedback module, subband uses information-generation module to use the information of subband to produce respective sub-bands according to this user terminal and uses information and pass to the channel-quality feedback module, and the channel-quality feedback module uses information respectively to the base station feedback channel quality information according to this subband.
A kind of user terminal of channel-quality feedback, this user terminal is used for communicating with the base station, wherein, this user terminal comprises that subband uses information-generation module and channel-quality feedback module, subband uses information-generation module to use the information of subband to produce respective sub-bands according to this user terminal and uses information and pass to the channel-quality feedback module, and the channel-quality feedback module is according to this subband use information difference feedback channel quality information.
Compared with prior art, the present invention is because in the frequency soft multiplexing system, the subband of user terminal uses information-generation module to use the information of subband to produce respective sub-bands according to this user terminal and uses information, and this information is passed to the channel-quality feedback module of user terminal, then the channel-quality feedback module can be according to this subband use information difference feedback channel quality information, therefore, channel-quality feedback technology of the present invention can reduce the amount of information that channel quality feedback information takies, and can feed back some useful informations, thereby make system normal always, work efficiently.
Description of drawings
Fig. 1 is that a kind of frequency re-use factor of prior art is 1 cellular network channeling schematic diagram.
Fig. 2 is that a kind of multiplexing factor of prior art is 3 cellular network channeling schematic diagram.
Fig. 3 is that a kind of frequency duplex factor as one of prior art is 3 cellular network frequency soft multiplexing schematic diagram.
Fig. 4 is a kind of ofdm system schematic diagram with 16 subcarriers of prior art.
Fig. 5 is a kind of channel quality schematic diagram with a certain moment of 12 subbands of prior art.
Fig. 6 is the cellular network frequency soft multiplexing schematic diagram of a kind of partial frequency multiplexing of prior art.
Fig. 7 is the workflow block diagram of the channel-quality feedback of the present invention's better embodiment.
Fig. 8 is divided into the schematic diagram of subband for the subcarrier of the present invention's better embodiment.
Fig. 9 is each sub-district boss's allocation of carriers schematic diagram of the present invention's better embodiment.
Figure 10 is the channel-quality feedback system configuration block diagram of the present invention's better embodiment.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is further detailed explanation.
The present invention's a kind of channel quality feedback method and user terminal thereof, system are not only applicable in the system with frequency soft multiplexing, equally are applicable to the system that adopts some other channeling interference coordination technique such as partial frequency multiplexing yet.
For realizing the multiple users diversity gain, improve spectrum efficiency, and the base station can based on certain dispatching criterion be different user terminals select they separately the reasonable subcarrier of condition transmit data, thereby make that the propagation conditions of most user terminals is all relatively good, therefore in frequency soft multiplexing system, need to the transmitting terminal feedback channel quality.
In frequency soft multiplexing system, general dominant frequency is different with secondary channel quality characteristic frequently, so their channel-quality feedback needs to handle respectively.Therefore, the channel quality feedback method of the present invention's one better embodiment as shown in Figure 7, it mainly comprises step as described below.
As shown in Figure 8, system has M subcarrier, and M is the positive integer greater than 1, all subcarriers of system are divided into the N group, and N is the positive integer greater than 1, and M is 4 multiple in the present embodiment, be N=M/4, so in the present embodiment, also can be expressed as the subband that M subcarrier is divided into the M/4 group.
The relation that subcarrier is divided into subband can immobilize, and also can carry out dynamic change according to the time, but the i.e. grouping random variation of subcarrier.
System takies 1/3 frequency band according to dominant frequency, and secondary 2/3 the rule of frequently taking is each cell allocation dominant frequency subband and secondary subband frequently, but can adjust in the reality, as adjusting according to business demand.
System passes through base station controller, for different neighbor cells is selected the boss carrier wave of above-mentioned different subband as this sub-district, other subband is as the auxiliary son carrier waves of this sub-district, boss's carrier wave is mainly used in the communication of Cell Edge User terminal, and auxiliary son carrier waves is mainly used in the communication of sub-district internal user terminal.
Boss's carrier wave to each sub-district is provided with different transmitting power thresholdings with auxiliary son carrier waves, and the transmitting power thresholding of boss's carrier wave is higher than the transmitting power thresholding of auxiliary son carrier waves, determines cell boarder with the coverage of boss's carrier wave.Like this, for inside, sub-district, the main low-power auxiliary son carrier waves transmission user terminal data that adopts, because closer from the base station, terminal can receive this sub-district signal clearly, and because auxiliary son carrier waves power is little, interference ratio to neighbor cell is less, i.e. the terminal of inside, sub-district is because each base station is by the restriction to transmitting power, can not be subjected to the interference of adjacent base station signal, perhaps disturb very little; And at each neighbor cell fringe region, adopt high power boss carrier transmission user terminal data, what be in that the terminal of fringe region mainly receives is boss's carrier wave of its affiliated subdistrict, because boss's carrier wave non-overlapping of different neighbor cells is not in on the frequency, be in quadrature, so the phase mutual interference will reduce greatly.
In addition, the division that subcarrier is divided into subband and boss's carrier wave and auxiliary son carrier waves can immobilize, also can carry out dynamic change according to the time, but be the grouping of subcarrier and the division random variation of boss's carrier wave and auxiliary son carrier waves, as long as neighbor cell does not use same subcarrier simultaneously in guaranteeing at one time.
For example, as shown in Figure 9,6 subcarriers are arranged, respective identification is respectively 1,2,3,4,5 and 6, in a period of time, the subcarrier that is designated 1 and 2 is divided into one group of subcarrier, the subcarrier that is designated 3 and 5 is divided into one group of subcarrier, the subcarrier that is designated 4 is divided into one group of subcarrier, the subcarrier that is designated 6 is divided into one group of subcarrier, and sub-district 1 is to be designated this group subcarrier of 1 and 2 as boss's carrier wave of this sub-district, and all the other subcarriers are as the auxiliary son carrier waves of this sub-district, neighbor cell 2 is to be designated this group subcarrier of 4 as boss's carrier wave of this sub-district, and all the other subcarriers are as the auxiliary son carrier waves of this sub-district; After a period of time, these 5 subcarriers can be divided into groups again, the subcarrier that is designated 2 and 5 is divided into one group of subcarrier, the subcarrier that is designated 4 and 6 is divided into one group of subcarrier, the subcarrier that is designated 1 is divided into one group of subcarrier, the subcarrier that is designated 3 is divided into one group of subcarrier, sub-district 1 is to be designated this group subcarrier of 4 and 6 as boss's carrier wave of this sub-district, all the other subcarriers are as the auxiliary son carrier waves of this sub-district, neighbor cell 2 is to be designated this group subcarrier of 3 as boss's carrier wave of this sub-district, and all the other subcarriers are as the auxiliary son carrier waves of this sub-district.
Component frequency soft multiplexing in, the subcarrier in the multicarrier system is divided into 2 parts: dominant frequency and secondary frequently.Concerning the pair frequency, its multiplexing factor is 1; The multiplexing factor of dominant frequency is 3, is about to the dominant frequency part and is divided into three sub-dominant frequency parts again according to the sub-district: sub-dominant frequency 1,2,3, and as the striped part among Fig. 6, each sub-district obtains sub-dominant frequency separately, and identical secondary frequency is adopted in all sub-districts.Sub-dominant frequency is mainly used in the communication of cell edge, the secondary communication that is mainly used in inside, sub-district frequently.
When user terminal need transmit data, user terminal is to base station feedback current C QI information, the base station determines that according to the CQI information of active user's terminal whether this user terminal only uses boss's carrier wave, only uses auxiliary son carrier waves, perhaps still uses the major-minor subcarrier simultaneously.
Generally be, the base station is a use subcarrier situation of determining user terminal according to the interference size, and when promptly disturbing big (it is poor to can be regarded as CQI), this user terminal only uses boss's carrier wave; When disturbing little (it is good to can be regarded as CQI), user terminal only uses auxiliary son carrier waves; But in actual applications, also to consider the user terminal data conditions of demand simultaneously,, may will use major and minor subcarrier simultaneously if when the user terminal data amount is very big.
Whether only use boss's carrier wave, only use auxiliary son carrier waves for user terminal, perhaps still use the situation of major-minor subcarrier simultaneously, the broadcast channel informing user terminal can be passed through in the base station, also can pass through other channel notification user terminal, also informing user terminal not.
Whether user terminal only uses boss's carrier wave, only uses auxiliary son carrier waves or use the subband of major-minor subcarrier to use information simultaneously according to it, and whether notify this operating position by broadcast channel according to the base station, user terminal is respectively to the transmitting terminal feedback channel quality, and is specific as follows described.
If user terminal only uses boss's carrier wave, and the base station is by the broadcast channel informing user terminal, i.e. known this operating position of user terminal, and then user terminal only feeds back the channel quality of this boss's carrier wave to transmitting terminal.
If user terminal only uses boss's carrier wave, and the base station is not by the broadcast channel informing user terminal, be that user terminal is not known this operating position, then user terminal need feed back boss's carrier wave of its affiliated subdistrict, the channel quality of auxiliary son carrier waves respectively to transmitting terminal.
If user terminal only uses auxiliary son carrier waves, and the base station is by the broadcast channel informing user terminal, i.e. known this operating position of user terminal, and then user terminal only feeds back the channel quality of this auxiliary son carrier waves to transmitting terminal.
If user terminal only uses auxiliary son carrier waves, and the base station is not by the broadcast channel informing user terminal, be that user terminal is not known this operating position, then user terminal need feed back boss's carrier wave of its affiliated subdistrict, the channel quality of auxiliary son carrier waves respectively to transmitting terminal.
If user terminal had both used boss's carrier wave, also use auxiliary son carrier waves, no matter whether the base station is by the broadcast channel informing user terminal so, no matter promptly whether user terminal knows this operating position, user terminal need feed back boss's carrier wave of its affiliated subdistrict, the channel quality of auxiliary son carrier waves respectively to transmitting terminal.
The invention still further relates to a kind of channel-quality feedback system, as shown in figure 10, structured flowchart for the preferable a kind of channel-quality feedback of the present invention system, this system mainly comprises base station and user terminal, this base station comprises that further subcarrier division module, major-minor allocation of subbands module, transmitting power are provided with module, subband uses information broadcast module, subband to use determination module, sending module, user terminal comprises that further receiver module, subband use information-generation module, channel-quality feedback module, and wherein the base station can not comprise that also subband uses the information broadcast module.
Subcarrier is divided module M the subcarrier that system is all and is divided into N group subband, and N is the positive integer greater than 1, and M is the positive integer greater than 1, and M is 4 multiple in the present embodiment, i.e. N=M/4, and subcarrier division module will be divided the result and be passed to sending module.
Subcarrier is divided module M subcarrier is divided into the relation of N group subband, and the relation that reaches N=M/4 can immobilize, and also can carry out dynamic change according to the time, but the i.e. grouping random variation of subcarrier.
Major-minor allocation of subbands module is divided module according to subcarrier division result is each cell allocation dominant frequency subband and secondary subband frequently according to certain rule.Major-minor allocation of subbands module generally is to take 1/3 frequency band according to dominant frequency, secondary 2/3 the rule of frequently taking is each cell allocation dominant frequency subband and secondary subband frequently, but can adjust in the reality, as adjusting according to business demand, the major-minor allocation of subbands is passed to sending module with allocation result.
Major-minor allocation of subbands module can be the base station controller of system, the major-minor allocation of subbands is that different neighbor cells is selected the boss carrier wave of above-mentioned different subband as this sub-district, other subband is as the auxiliary son carrier waves of this sub-district, boss's carrier wave is mainly used in the communication of Cell Edge User terminal, and auxiliary son carrier waves is mainly used in the communication of sub-district internal user terminal.
Transmitting power is provided with module boss's carrier wave of each sub-district is provided with different transmitting power thresholdings with auxiliary son carrier waves, and the transmitting power thresholding of boss's carrier wave is higher than the transmitting power thresholding of auxiliary son carrier waves, coverage with boss's carrier wave is determined cell boarder, and transmitting power is provided with module and the result will be set pass to sending module.
Like this, for inside, sub-district, the main low-power auxiliary son carrier waves transmission user terminal data that adopts, because closer from the base station, terminal can receive this sub-district signal clearly, and because auxiliary son carrier waves power is little, interference ratio to neighbor cell is less, i.e. the terminal of inside, sub-district is because each base station is by the restriction to transmitting power, can not be subjected to the interference of adjacent base station signal, perhaps disturb very little; And at each neighbor cell fringe region, adopt high power boss carrier transmission user terminal data, what be in that the terminal of fringe region mainly receives is boss's carrier wave of its affiliated subdistrict, because boss's carrier wave non-overlapping of different neighbor cells is not in on the frequency, be in quadrature, so the phase mutual interference will reduce greatly.Transmitting power is provided with module can also dynamically adjust boss's carrier wave and the set transmitting power thresholding of auxiliary son carrier waves.
In addition, the division that subcarrier is divided subband and boss's carrier wave and auxiliary son carrier waves can immobilize, also can carry out dynamic change according to the time, but be the grouping of subcarrier and the division random variation of boss's carrier wave and auxiliary son carrier waves, as long as neighbor cell does not use same subcarrier simultaneously in guaranteeing at one time.
When user terminal need transmit data, user terminal is to base station feedback current C QI information, subband uses the CQI information of determination module according to active user's terminal, determines that whether this user terminal only uses boss's carrier wave, only uses auxiliary son carrier waves, perhaps still uses the major-minor subcarrier simultaneously.
In addition, subband uses determination module whether user terminal only can also be used boss's carrier wave, only use auxiliary son carrier waves, perhaps still use the subband of major-minor subcarrier to use information further to pass to subband use information broadcast module simultaneously, use the information of subband and pass to sending module about user terminal by the generation of subband use information broadcast module is corresponding; Subband uses determination module also can directly whether user terminal only be used boss's carrier wave, only use auxiliary son carrier waves, perhaps still use the information of major-minor subcarrier to pass to sending module simultaneously, then described user terminal is used the information of subband by the broadcast channel informing user terminal by sending module at last, also can pass through other channel notification user terminal, also informing user terminal not.
The subband of user terminal uses information-generation module whether only to use boss's carrier wave, only use auxiliary son carrier waves or use the situation of major-minor subcarrier to produce respective sub-bands respectively simultaneously and use information and pass to the channel-quality feedback module according to user terminal.
If the information that whether sending module of base station only used described user terminal boss's carrier wave, only use auxiliary son carrier waves or use the major-minor subcarrier simultaneously is by the broadcast channel informing user terminal, then the receiver module of relative users terminal also needs this information is passed to the channel-quality feedback module after receiving this information.
Whether the channel-quality feedback module is only used boss's carrier wave, is only used auxiliary son carrier waves or use the subband of major-minor subcarrier to use information simultaneously according to user terminal, and use this operating position of information broadcast module broadcasting according to whether receiving subband, to the transmitting terminal feedback channel quality, specific as follows described respectively.
If user terminal only uses boss's carrier wave, and the sending module of base station is by the broadcast channel informing user terminal, then the subband of user terminal uses information-generation module generation user terminal only to use boss's carrier information and pass to the channel-quality feedback module, and the user terminal that receiver module receives described broadcasting only uses boss's carrier information and passes to the channel-quality feedback module, and the channel-quality feedback module is only fed back the channel quality of this boss's carrier wave to transmitting terminal according to these two kinds of information.
If user terminal only uses boss's carrier wave, and the sending module of base station is not by the broadcast channel informing user terminal, then the subband of user terminal uses information-generation module generation user terminal only to use boss's carrier information and pass to the channel-quality feedback module, and the channel-quality feedback module is fed back boss's carrier wave of this user terminal affiliated subdistrict, the channel quality of auxiliary son carrier waves according to this information respectively to transmitting terminal.
If user terminal only uses auxiliary son carrier waves, and the sending module of base station is by the broadcast channel informing user terminal, then the subband of user terminal uses information-generation module generation user terminal only to use auxiliary son carrier waves information and pass to the channel-quality feedback module, and the user terminal that receiver module receives described broadcasting only uses auxiliary son carrier waves information and passes to the channel-quality feedback module, and the channel-quality feedback module is only fed back the channel quality of this auxiliary son carrier waves to transmitting terminal according to these two kinds of information.
If user terminal only uses auxiliary son carrier waves, and the sending module of base station is not by the broadcast channel informing user terminal, then subband uses information-generation module generation user terminal only to use auxiliary son carrier waves information and pass to the channel-quality feedback module, and the channel-quality feedback module is fed back boss's carrier wave of this user terminal affiliated subdistrict, the channel quality of auxiliary son carrier waves according to this information respectively to transmitting terminal.
If user terminal had both used boss's carrier wave, also use auxiliary son carrier waves, then subband uses information-generation module generation user terminal all to use boss's carrier wave and auxiliary son carrier waves information and pass to the channel-quality feedback module, no matter whether the sending module of base station is by the broadcast channel informing user terminal so, the channel-quality feedback module all needs to feed back boss's carrier wave of this user terminal affiliated subdistrict, the channel quality of auxiliary son carrier waves respectively to transmitting terminal.
In sum, by the better embodiment of the invention described above as can be known, to a kind of channel quality feedback method of the present invention and user terminal thereof, system, because the subband of user terminal uses information-generation module to use the information of subband to produce respective sub-bands according to this user terminal and uses information and pass to the channel-quality feedback module, the channel-quality feedback module can be according to this subband use information difference feedback channel quality information, therefore, channel-quality feedback technology of the present invention can reduce the amount of information that channel quality feedback information takies, and can feed back some useful informations, thereby make system normal always, work efficiently.
But above-mentioned only is better embodiment of the present invention; be not to be used to limit protection scope of the present invention; any those skilled in the art of being familiar with will be appreciated that; all within the spirit and principles in the present invention scope; any modification of being done, equivalence replacement, improvement etc. all should be included within the scope of the present invention.
Claims (19)
1. a channel quality feedback method is characterized in that, comprises
Steps A, dividing whole frequency band is N subband, N is the positive integer greater than 1, and is used for the dominant frequency subband and the secondary subband frequently of cell communication for each cell allocation;
Step B determines that user terminal uses dominant frequency subband, secondary subband frequently one of at least;
Step C, user terminal according to its information of using subband respectively to transmitting terminal feedback channel quality information.
2. a kind of channel quality feedback method as claimed in claim 1 is characterized in that, and: step B further comprises according to the current CQI information of user terminal and determines that user terminal uses dominant frequency subband, secondary subband frequently one of at least.
3. a kind of channel quality feedback method as claimed in claim 1, it is characterized in that: the dominant frequency subband is used for the communication of cell boundary users terminal, secondary subband frequently is used for the communication of sub-district internal user terminal, and the transmitting power thresholding of dominant frequency subband is greater than the transmitting power thresholding of pair frequency subband.
4. as claim 1,2 or 3 each described a kind of channel quality feedback methods, it is characterized in that: among the step B, only use dominant frequency subband, secondary one of subband frequently if determine user terminal, and user terminal is not known the information that it uses subband, and then user terminal feeds back the dominant frequency subband of its affiliated subdistrict, the secondary channel quality information of subband frequently respectively to transmitting terminal.
5. a kind of channel quality feedback method as claimed in claim 1 is characterized in that: step B comprises that further the information that user terminal is used subband is by the broadcast channel informing user terminal.
6. a kind of channel quality feedback method as claimed in claim 5, it is characterized in that: among the step B, only use dominant frequency subband, secondary one of subband frequently if determine user terminal, then user terminal only feeds back the channel quality information of its corresponding employed subband to transmitting terminal.
7. as claim 1,2,3 or 5 each described a kind of channel quality feedback methods, it is characterized in that: among the step B, use dominant frequency subband, secondary subband frequently simultaneously if determine user terminal, then user terminal feeds back the dominant frequency subband of its affiliated subdistrict, the secondary channel quality information of subband frequently respectively to transmitting terminal.
8. channel-quality feedback system, this system mainly comprises base station and user terminal, this base station further comprises subcarrier division module, major-minor allocation of subbands module, it is N subband that subcarrier is divided the Module Division whole frequency band, N is the positive integer greater than 1, major-minor allocation of subbands module is according to dividing the result is used for cell communication for each cell allocation dominant frequency subband and secondary subband frequently, then base station and user terminal communicate according to above-mentioned sub-band division and assignment information, it is characterized in that, the base station comprises that also being used for definite user terminal uses the dominant frequency subband, secondary subband frequently subband one of at least uses determination module, user terminal comprises that also subband uses information-generation module and channel-quality feedback module, subband uses information-generation module to use the information of subband to produce respective sub-bands according to this user terminal and uses information and pass to the channel-quality feedback module, and the channel-quality feedback module uses information respectively to the base station feedback channel quality information according to this subband.
9. a kind of channel-quality feedback as claimed in claim 8 system is characterized in that the base station also comprises a sending module, and sending module uses the information informing user terminal by broadcast channel with subband.
10. a kind of channel-quality feedback system that states as claim 8 is characterized in that, subband uses determination module to determine that according to the current CQI information of user terminal user terminal uses dominant frequency subband, secondary subband frequently one of at least.
11. a kind of channel-quality feedback as claimed in claim 8 system, it is characterized in that: the dominant frequency subband is used for the communication of cell boundary users terminal, secondary subband frequently is used for the communication of sub-district internal user terminal, and the base station comprises that also a transmitting power is provided with module the transmitting power thresholding of the transmitting power thresholding of dominant frequency subband greater than pair frequency subband is set.
12. as claim 8,10 or 11 each described a kind of channel-quality feedback systems, it is characterized in that: subband uses determination module to determine that user terminal only uses dominant frequency subband, secondary one of subband frequently, and user terminal is not known the information that it uses subband, and then the channel-quality feedback module of user terminal is fed back the dominant frequency subband of its affiliated subdistrict, the secondary channel quality information of subband frequently respectively to the base station.
13. a kind of channel-quality feedback as claimed in claim 9 system, it is characterized in that: subband uses determination module to determine that user terminal only uses dominant frequency subband, secondary one of subband frequently, and then the channel-quality feedback module of user terminal is only fed back the channel quality information of its corresponding employed subband to the base station.
14. as claim 8,9,10 or 11 each described a kind of channel-quality feedback systems, it is characterized in that: subband uses determination module to determine that user terminal uses dominant frequency subband, secondary subband frequently simultaneously, and then the channel-quality feedback module of user terminal is fed back the dominant frequency subband of its affiliated subdistrict, the secondary channel quality information of subband frequently respectively to transmitting terminal.
15. the user terminal of a channel-quality feedback, this user terminal is used for communicating with the base station, it is characterized in that, this user terminal comprises that subband uses information-generation module and channel-quality feedback module, subband uses information-generation module to use the information of subband to produce respective sub-bands according to this user terminal and uses information and pass to the channel-quality feedback module, and the channel-quality feedback module is according to this subband use information difference feedback channel quality information.
16. the user terminal of a kind of channel-quality feedback as claimed in claim 15, it is characterized in that: user terminal only uses dominant frequency subband, secondary one of subband frequently, and user terminal is not known the information that it uses subband, and then the channel-quality feedback module is fed back the dominant frequency subband of its affiliated subdistrict, the secondary channel quality information of subband frequently respectively.
17. the user terminal of a kind of channel-quality feedback as claimed in claim 16 is characterized in that: user terminal also comprises a receiver module, and receiver module receives subband by broadcast channel and uses information and pass to the channel-quality feedback module.
18. the user terminal of a kind of channel-quality feedback as claimed in claim 17, it is characterized in that: user terminal only uses dominant frequency subband, secondary one of subband, the then channel quality information of a channel-quality feedback module corresponding employed subband of feedback user terminal frequently.
19. user terminal as claim 15 or 17 described a kind of channel-quality feedback, it is characterized in that: user terminal uses dominant frequency subband, secondary subband frequently simultaneously, and then the channel-quality feedback module is fed back the dominant frequency subband of its affiliated subdistrict, the secondary channel quality information of subband frequently respectively.
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