CN107872830A - Calculate the method and apparatus of channel quality instruction - Google Patents

Calculate the method and apparatus of channel quality instruction Download PDF

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Publication number
CN107872830A
CN107872830A CN201610859534.9A CN201610859534A CN107872830A CN 107872830 A CN107872830 A CN 107872830A CN 201610859534 A CN201610859534 A CN 201610859534A CN 107872830 A CN107872830 A CN 107872830A
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subband
channel quality
bandwidth
base station
weighted factor
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CN107872830B (en
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章钱
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Chenxin Technology Co ltd
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Leadcore Technology Co Ltd
Datang Semiconductor Design Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to the communications field, discloses a kind of method and apparatus for calculating channel quality instruction.In the present invention, dispatch situation of the terminal according to each subband bandwidth of current persistent district and base station to each subband, the weighted factor of each subband is calculated, further according to each subband bandwidth and each weighted factor, calculate the channel quality indicator (CQI) value of cell system bandwidth.Pass through this operation, dispatch situation of the terminal according to base station to each subband, the CQI weighted factors of adjustment different sub-band in real time, effectively improve broadband CQI accuracy, make terminal to the rational broadband CQI of base station feedback, so as to improve the reasonability of whole descending scheduling, the transmission rate of descending handling capacity and terminal is improved.

Description

Calculate the method and apparatus of channel quality instruction
Technical field
The present invention relates to the communications field, more particularly to a kind of method and apparatus for calculating channel quality instruction.
Background technology
In Long Term Evolution LTE (Long Term Evolution) system, terminal periodic or aperiodic to network side Or base station feedback channel condition information CSI (Channel Status Indicator), wherein, CSI includes order instruction RI (Rank Indicator), pre-coding matrix instruction PMI (Precoding Matrix Index), channel quality indicator (CQI) (Channel Quality Indicator).For CQI, two kinds of feedback, respectively broadband feedback and son are supported Band feedback, as shown in figure 1, in broadband feedback (horizontal line fill part in figure), all moneys in a subframe in system bandwidth Source unit REs (Resource Elements) be may serve to calculate feedback information, and (figure bend is filled in subband feedback Part), the REs in the specific bandwidth of a subframe is just used to calculate feedback information.Reporting for broadband CQI decides eNodeB The code check and modulation system of the transmission block of dispatch terminal, therefore the accuracy that broadband CQI is reported has to the transmission rate of terminal Important influence.
In LTE system, terminal broadband CQI calculating is typically the letter to each RE in system bandwidth in a subframe Channel estimation matrix carries out computing, calculates each RE metric, such as equivalent Signal to Interference plus Noise Ratio SINR (Signal-to- Interference and Noise Ratio), the final metric obtained in system bandwidth on all RE average, and Suitable broadband CQI is selected to report network according to the metric on this average.Null terminator Null band CQI is also to the subband Interior each RE metrics carry out calculating the CQI value for obtaining the subband.After the CQI value of calculating is reported network by terminal, network The CQI value reported according to terminal dispatches corresponding resource.
Understood according to being described above, network configuration terminal reports the CQI two ways to be：Broadband CQI and subband CQI, Under some transmission modes (periodic feedback as shown in table 1), terminal can only feed back broadband CQI without feeding back subband CQI, net Network can only be according to broadband CQI come the resource information of dispatch terminal.
Table 1
Note：In table 1, transmission mode 1,2,3,7 selectable modes 1-0 or 2-0 in LTE, transmission mode 4,5,6 can modeling Formula 1-1 or 2-1, transmission mode 8 have been configured to given the correct time on PMI/RI selection mode 1-1 or 2-1 in terminal, nothing are configured in terminal Selection mode of being given the correct time on PMI/RI 1-0 or 2-0.
The complexity of communication system and the interference of surrounding radio, inevitably occur dry in different frequency domain resources Situation difference, that is, the situation that subband CQI is otherwise varied are disturbed, but broadband CQI is the degree according to each RE in whole bandwidth Magnitude calculation, averaged again equivalent to the CQI for calculating each subband, get broadband CQI and report network, i.e.,： Broadband CQI=(CQI1+CQI2+...+CQIN)/N, wherein, CQIiRepresent the CQI value of i-th of subband, N is subband number, i= 1,2,...,N.The scheduling of resource of network, such as：Modulation and coding strategy MCS (Modulation and Coding Scheme), transport block size TBS (Transport Block Size) etc. is, it is necessary to which the broadband CQI reported according to terminal is adjusted Degree.
However, inventors herein have recognized that, because network does not know which subband of terminal has interference, it is possible to adjust Just always on noisy subband, the broadband CQI that terminal reports situations bigger than normal thus occur in the frequency domain resource of degree, after And the demodulation ability of terminal and the CQI value actually reported is caused to mismatch.
The content of the invention
The purpose of embodiment of the present invention is to provide a kind of method and apparatus for calculating channel quality instruction, effectively improved Broadband CQI accuracy, terminal is fed back rational broadband CQI, improve the reasonability of descending scheduling, and be advantageous under raising Capable handling capacity and the transmission rate of terminal.
In order to solve the above technical problems, embodiments of the present invention provide a kind of method for calculating channel quality instruction, Including：
Obtain each subband bandwidth T of current persistent districti；
Dispatch situation according to base station side to each subband, calculate the weighted factor a of each subbandi；
According to each subband bandwidth TiWith each weighted factor ai, calculate the channel quality instruction of cell system bandwidth CQI value；
Wherein, i=1,2 ..., N, N be subband number.
Embodiments of the present invention additionally provide a kind of equipment for calculating channel quality instruction, including：
Acquisition module, for obtaining each subband bandwidth T of current persistent districti；
Weighted factor computing module, for the dispatch situation according to base station side to each subband, calculate the weighting of each subband because Sub- ai；
Channel quality indicator (CQI) value computing module, for according to each subband bandwidth TiWith each weighted factor ai, Calculate the channel quality indicator (CQI) value of the system bandwidth；
Wherein, i=1,2 ..., N, N be subband number.
In terms of existing technologies, terminal obtains each subband bandwidth T of current persistent district to embodiment of the present inventioni Afterwards, the dispatch situation according to base station side to each subband, the CQI weighted factors a of different sub-band is adjusted in real timei, so as to adjust in real time Proportion shared in the CQI of broadband each subband CQI so that the broadband CQI calculated accurately reflects base station scheduling frequency as far as possible The channel quality of domain position, it is easy to base station more efficiently, reasonably to carry out the scheduling of whole downlink bandwidth, is advantageous to improve descending Handling capacity and terminal transmission rate.
In addition, in the dispatch situation according to base station side to each subband, the weighted factor a of each subband is calculatediBefore, also Including：Initialize the weighted factor a of each subbandiFor identical value：a1=a2=...=aN=1/N.Initially divide equally each The weighted factor of individual subband, it ensure that the fairness between each subband so that can be just and sound when calculating broadband CQI consider is each Individual subband.
In addition, the dispatch situation according to base station side to each subband, the weighted factor a of each subband is calculatedi, specific bag Include：Scheduling times M of the base station to each subband in record preset timei；According to the scheduling times Mi, calculate each subband Weighted factor ai；Wherein, ai=Mi/(M1+M2+...+MN).According to the actual schedule situation of each subband, pass through the scheduling of each subband Number intuitively embodies, and readjusts the weighted factor of each subband, increases the weighted factor for the subband frequently dispatched, subtracts It is small will not be by the weighted factor of the subband of height so that the distribution of weighted factor is more reasonable.
In addition, scheduling times M of the base station to each subband in the record preset timei, specifically include：Record preset time The index of each subband residing for the frequency domain position of interior base station scheduling；The number occurred to the index of each subband adds up, Obtain the scheduling times M of each subbandi.Base station will pass through the frequency domain position of base station scheduling to the dispatch situation of each subband Residing each subband obtains, and distinguishes or records for convenience, each subband has a corresponding index, so as to basis The number that the index of each subband occurs, easily count the scheduled number of each subband.
Brief description of the drawings
Fig. 1 is broadband feedback CQI and subband feedback CQI schematic diagram in the prior art；
Fig. 2 is the method flow diagram indicated according to a kind of calculating channel quality of first embodiment of the invention；
Fig. 3 is the method flow diagram indicated according to a kind of calculating channel quality of second embodiment of the invention；
Fig. 4 is the device structure schematic diagram indicated according to a kind of calculating channel quality of third embodiment of the invention；
Fig. 5 is the device structure schematic diagram indicated according to a kind of calculating channel quality of four embodiment of the invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, each reality below in conjunction with accompanying drawing to the present invention The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the present invention, In order that reader more fully understands the application and proposes many ins and outs.But even if without these ins and outs and base Many variations and modification in following embodiment, the application technical scheme claimed can also be realized.
The first embodiment of the present invention is related to a kind of method for calculating channel quality instruction.Idiographic flow is as shown in Figure 2.
In step 201, each subband bandwidth of current persistent district is obtained, i.e., terminal is according to the system of current persistent district Bandwidth obtains each subband bandwidth T of the celli。
Specifically, terminal pre-establishes the corresponding relation of cell system bandwidth and subband bandwidth, further according to current resident The system bandwidth of cell, the corresponding relation is searched, obtain each subband bandwidth T of current persistent districti, and can be further somebody's turn to do The subband number N, i=1,2 ..., N of cell.Wherein, the corresponding relation of cell system bandwidth and subband bandwidth, such as table 2 below institute Show.
Table 2
Further, cell system bandwidth is generally represented with resource block RB (Resource Block) numbers taken, when Cell system bandwidth does not divide subband when 6RB is to 7RB scopes, when cell system bandwidth in 8RB to 10RB scopes when, then should Each a width of 4RB of subband band of cell, when cell system bandwidth in 11RB to 26RB scopes when, each a width of 4RB of subband band of the cell, when Cell system bandwidth is when 27RB is to 63RB scopes, each a width of 6RB of subband band of the cell, when cell system bandwidth in 64RB extremely During 110RB scopes, each a width of 8RB of subband band of the cell.Then, according to the corresponding relation of cell system bandwidth and subband bandwidth, Obtain the bandwidth and subband number N of each subband of the cell.
In step 202, the weighted factor and scheduling times of each subband are initialized, in advance to the weighted factor of each subband with Scheduling times give an initial value respectively.
Specifically, by the weighted factor a of each subbandiIt is initialized as identical value：a1=a2=...=aN=1/N, will be each The scheduling times M of subbandiIt is initialized as 0：M1=M2=...=MN=0, wherein, N is subband number.
In step 203, the scheduled number of each subband is obtained, that is, obtains scheduling of the base station to each subband in preset time Number Mi.Specifically, the index of each subband in preset time residing for the frequency domain position of base station scheduling is recorded, then to each subband The number that occurs of index added up, obtain each subband and be scheduled number Mi。
In step 204, the weighted factor of each subband is calculated, the dispatch situation according to base station to each subband, calculates each son The weighted factor a of bandi.Specifically, the scheduling times M according to base station in preset time to each subbandi, readjust each subband Weighted factor ai, wherein, ai=Mi/(M1+M2+...+MN), i=1,2 ..., N.
In step 205, the broadband CQI value of cell is calculated, according to each subband bandwidth TiWith each weighted factor ai, calculate small The channel quality indicator (CQI) value of sound zone system bandwidth.Specifically, below equation, the CQI value of computing system bandwidth are passed through：W=a1 ×T1+a2×T2+...+aN×TN, wherein, W represents the CQI value.
In step 206, whether terminal stops asking base station, that is, judges whether terminal has stopped sending base station and control Request in terms of signaling or data service, if terminal stops the request to base station, terminate, otherwise return to step 201, continue Carry out broadband CQI corresponding calculating process.
Compared with prior art, in the present embodiment, terminal is according to each subband bandwidth of current persistent district and base station To the dispatch situation of each subband, the weighted factor of each subband is calculated, further according to each subband bandwidth and each weighted factor, is calculated The CQI value of cell system bandwidth.By this operation, dispatch situation of the terminal according to base station to each subband, adjustment is different in real time The CQI weighted factors of subband, broadband CQI accuracy is effectively improved, make terminal to the rational broadband CQI of base station feedback, so that The reasonability of whole descending scheduling is improved, improves the transmission rate of descending handling capacity and terminal.
Second embodiment of the present invention is related to a kind of method for calculating channel quality instruction.Second implements to be real to first The further improvement of mode is applied, is mainly theed improvement is that：In second embodiment of the invention, it furthermore present acquisition and work as The precondition of each subband bandwidth of preceding persistent district：Judge that terminal is resident another new cell again, taken into full account terminal Actual motion situation, make terminal to the more rational broadband CQI of base station feedback, it is specific as shown in Figure 3.
In step 301, judge whether to be resident another new cell, that is, judge terminal whether because mobile or other reasons And be resident again in another new cell, if so, step 302 is then performed, if otherwise performing step 304.
Specifically, only when terminal is resident another new cell again, just need to obtain each of current persistent district Subband bandwidth, that is, perform step 302.If terminal is not resident another new cell again, it is small that terminal is resident this at the beginning Qu Shi, has just got each subband bandwidth of institute persistent district, and completes weighted factor and the scheduling time of each subband Several initialization, as long as the follow-up dispatch situation according to base station to each subband, the scheduling times of each subband are obtained, that is, are performed Step 304.
Step 302 in present embodiment is to 306 and the substantially phase of the step 201 of second embodiment of the present invention to 205 Together, will not be repeated here.
In step 307, whether terminal stops asking base station, that is, judges whether terminal has stopped sending base station and control Request in terms of signaling or data service, if terminal stops the request to base station, terminate, otherwise return to step 301, continue Carry out broadband CQI corresponding calculating process.
In the present embodiment, the precondition for each subband bandwidth for obtaining current persistent district is given：Judge terminal Again another new cell is resident, the actual motion situation of terminal has been taken into full account, has made terminal more rational to base station feedback Broadband CQI, further improve the reasonability of whole descending scheduling.
The step of various methods divide above, be intended merely to describe it is clear, can be merged into when realizing a step or Some steps are split, are decomposed into multiple steps, as long as including identical logical relation, all protection domain in this patent It is interior；To either adding inessential modification in algorithm in flow or introducing inessential design, but its algorithm is not changed Core design with flow is all in the protection domain of the patent.
Third embodiment of the invention is related to a kind of equipment for calculating channel quality instruction, as shown in figure 4, including：Obtain Module 41, initialization module 42, computing module 43, weighted factor computing module 44 and channel quality indicator (CQI) value computing module 45, it is specific as shown in Figure 4.
Acquisition module 41, for obtaining each subband bandwidth of current persistent district, i.e., terminal is according to current persistent district System bandwidth obtains each subband bandwidth T of the celli。
Initialization module 42, for initializing the weighted factor and scheduling times of each subband, by the weighted factor of each subband aiIt is initialized as identical value：a1=a2=...=aN=1/N, by the scheduling times M of each subbandiIt is initialized as 0：M1=M2=... =MN=0, wherein, N is subband number.
Computing module 43, the number being scheduled for each subband, that is, obtain scheduling of the base station to each subband in preset time Number Mi。
Weighted factor computing module 44, for calculating the weighted factor of each subband, according to scheduling feelings of the base station to each subband Condition, calculate the weighted factor a of each subbandi。
Channel quality indicator (CQI) value computing module 45, for calculating the broadband CQI value of cell, according to each subband bandwidth Ti With each weighted factor ai, the channel quality indicator (CQI) value of calculating cell system bandwidth.
It is seen that present embodiment is the system embodiment corresponding with first embodiment, present embodiment can be with First embodiment is worked in coordination implementation.The relevant technical details mentioned in first embodiment still have in the present embodiment Effect, in order to reduce repetition, is repeated no more here.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in In first embodiment.
In present embodiment, dispatch situation of the terminal according to base station to each subband, the CQI weightings of different sub-band are adjusted in real time The factor, broadband CQI accuracy is effectively improved, make terminal to the rational broadband CQI of base station feedback, so as to improve whole descending tune The reasonability of degree, improve the transmission rate of descending handling capacity and terminal.
It is noted that each module involved in present embodiment is logic module, and in actual applications, one Individual logic unit can be a part for a physical location or a physical location, can also be with multiple physics lists The combination of member is realized.In addition, in order to protrude the innovative part of the present invention, will not be with solving institute of the present invention in present embodiment The unit that the technical problem relation of proposition is less close introduces, but this is not intended that in present embodiment and other lists are not present Member.
Four embodiment of the invention is related to a kind of equipment for calculating channel quality instruction.4th embodiment is to the 3rd The further improvement implemented, is mainly theed improvement is that：In four embodiment of the invention, it furthermore present and perform acquisition The precondition of module 41：Detect that terminal is resident another new cell again by detection module 46, so as to take into full account end The actual motion situation at end, make terminal to the more rational broadband CQI of base station feedback, it is specific as shown in Figure 5.
Detection module 46 in Fig. 5, another new cell whether is resident for detection terminal, i.e., detection terminal whether because Mobile or other reasons and be resident again in another new cell.
Specifically, only when terminal is resident another new cell again, just need to obtain by acquisition module 41 and work as Each subband bandwidth of preceding persistent district.If terminal is not resident another new cell again, it is small that terminal is resident this at the beginning Qu Shi, has just got each subband bandwidth of institute persistent district, and completes weighted factor and the scheduling time of each subband Several initialization, as long as the follow-up scheduling times that each subband is obtained according to computing module 43.
Because second embodiment is mutually corresponding with present embodiment, therefore present embodiment can be mutual with second embodiment It is engaged implementation.The relevant technical details mentioned in second embodiment are still effective in the present embodiment, implement second The technique effect that can reach in mode can similarly be realized in the present embodiment, no longer superfluous here in order to reduce repetition State.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in second embodiment.
In the present embodiment, the precondition for each subband bandwidth for obtaining current persistent district is given：Utilize detection Whether module detection terminal is resident another new cell again, has taken into full account the actual motion situation of terminal, has made terminal to base The more rational broadband CQI of feedback of standing, further improve the reasonability of whole descending scheduling.
It will be appreciated by those skilled in the art that realize that all or part of step in above-described embodiment method is to pass through Program instructs the hardware of correlation to complete, and the program storage is in the storage medium, including some instructions are causing one Individual equipment (can be single-chip microcomputer, chip etc.) or processor (processor) perform each embodiment methods described of the application All or part of step.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey The medium of sequence code.
It will be understood by those skilled in the art that the respective embodiments described above are to realize the specific embodiment of the present invention, And in actual applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.

Claims (12)

  1. A kind of 1. method for calculating channel quality instruction, it is characterised in that including：
    Obtain each subband bandwidth T of current persistent districti；
    Dispatch situation according to base station to each subband, calculate the weighted factor a of each subbandi；
    According to each subband bandwidth TiWith each weighted factor ai, the channel quality indicator (CQI) of calculating cell system bandwidth Value；
    Wherein, i=1,2 ..., N, N be subband number.
  2. 2. it is according to claim 1 calculate channel quality instruction method, it is characterised in that it is described according to base station to each The dispatch situation of subband, calculate the weighted factor a of each subbandiBefore, in addition to：
    Initialize the weighted factor a of each subbandiFor identical value：a1=a2=...=aN=1/N.
  3. 3. the method according to claim 1 or 2 for calculating channel quality instruction, it is characterised in that described according to base station pair The dispatch situation of each subband, calculate the weighted factor a of each subbandi, specifically include：
    Scheduling times M of the base station to each subband in acquisition preset timei；
    According to the scheduling times Mi, the weighted factor a of calculating each subbandi；
    Wherein, ai=Mi/(M1+M2+...+MN)。
  4. 4. the method according to claim 3 for calculating channel quality instruction, it is characterised in that in the record preset time Scheduling times M of the interior base station to each subbandiBefore, in addition to：
    Initialize the scheduling times M of each subbandiFor 0：M1=M2=...=MN=0.
  5. 5. the method according to claim 3 for calculating channel quality instruction, it is characterised in that in the acquisition preset time Scheduling times M of the base station to each subbandi, specifically include：
    Record the index of each subband in preset time residing for the frequency domain position of base station scheduling；
    The number occurred to the index of each subband adds up, and obtains the scheduling times M of each subbandi。
  6. 6. the method according to claim 1 for calculating channel quality instruction, it is characterised in that described according to each subband Bandwidth TiWith each weighted factor ai, the channel quality indicator (CQI) value of cell system bandwidth is calculated, is specifically included：
    By below equation, the CQI value of the system bandwidth is calculated：
    W=a1×T1+a2×T2+...+aN×TN
    Wherein, W represents the CQI value.
  7. 7. the method according to claim 1 for calculating channel quality instruction, it is characterised in that the acquisition is currently resident small Each subband bandwidth T in areai, specifically include：
    The corresponding relation of default cell system bandwidth and subband bandwidth；
    According to the system bandwidth of current persistent district, the corresponding relation is searched, gets each subband band of current persistent district Wide Ti。
  8. 8. the method according to claim 7 for calculating channel quality instruction, it is characterised in that be currently resident in the basis The system bandwidth of cell, the corresponding relation is searched, get each subband bandwidth T of current persistent districtiBefore, in addition to：
    Judge that terminal is resident another new cell again.
  9. A kind of 9. equipment for calculating channel quality instruction, it is characterised in that including：
    Acquisition module, for obtaining each subband bandwidth T of current persistent districti；
    Weighted factor computing module, for the dispatch situation according to base station side to each subband, calculate the weighted factor a of each subbandi；
    Channel quality indicator (CQI) value computing module, for according to each subband bandwidth TiWith each weighted factor ai, calculate The channel quality indicator (CQI) value of the system bandwidth；
    Wherein, i=1,2 ..., N, N be subband number.
  10. 10. the equipment according to claim 9 for calculating channel quality instruction, it is characterised in that also include：Initialize mould Block；
    The initialization module, for initializing the weighted factor a of each subbandiFor identical value：a1=a2=...=aN=1/ N。
  11. 11. the equipment for calculating channel quality instruction according to claim 9 or 10, it is characterised in that the weighted factor Computing module specifically includes：Record sub module and calculating sub module；
    The record sub module, for recording in preset time base station to the scheduling times M of each subbandi；
    The calculating sub module, for according to the scheduling times Mi, the weighted factor a of calculating each subbandi；Wherein, ai= Mi/(M1+M2+...+MN)。
  12. 12. the equipment according to claim 11 for calculating channel quality instruction, it is characterised in that the initialization module, It is additionally operable to initialize the scheduling times M of each subbandiFor 0：M1=M2=...=MN=0.
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