CN101820685B - Frequency selectivity dispatching method and base station - Google Patents

Frequency selectivity dispatching method and base station Download PDF

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CN101820685B
CN101820685B CN201010147384A CN201010147384A CN101820685B CN 101820685 B CN101820685 B CN 101820685B CN 201010147384 A CN201010147384 A CN 201010147384A CN 201010147384 A CN201010147384 A CN 201010147384A CN 101820685 B CN101820685 B CN 101820685B
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prb
channel quality
fixed time
value
snr value
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CN201010147384A
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CN101820685A (en
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吴松
徐铁铸
程履帮
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新邮通信设备有限公司
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Abstract

The invention discloses a frequency selectivity dispatching method and a base station. The method comprises that: the base station acquires the channel quality of each physical resource block (PRB) in a downlink subframe according to a channel quality index (CQI) measuring value reported by UE; the base station acquires the channel quality of each PRB in an uplink subframe according to a sounding reference sequence (SRS) sent by the UE and/or a demodulation reference sequence (DMRS) sent along with uplink data; and when the base station needs to perform uplink/downlink frequency selectivity dispatching on the UE, the base station distributes uplink/downlink PRB to the UE according to the channel quality of each PRB in the downlink subframe and the channel quality of each PRB in the uplink subframe in a specified time. The technical scheme of the invention improves the frequency selectivity dispatching performance.

Description

A kind of frequency selectivity dispatching method and a kind of base station

Technical field

The present invention relates to the mobile communication technology field, particularly relate to a kind of frequency selectivity dispatching method and a kind of base station.

Background technology

Long Term Evolution (LTE) system is a kind of wide-band mobile communication system, and the system bandwidth of support comprises: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz.For the ease of the distribution of resource, on frequency domain, be that the smallest particles degree carries out resource allocation in the LTE system at present with Physical Resource Block (PRB), wherein, a PRB comprises 12 number of sub-carrier, the bandwidth of each subcarrier is 15KHz.

For broadband system; Since different user equipment (UE) on each frequency band on the whole bandwidth suffered channel fading with disturb different; When therefore network side carried out scheduling of resource, to the difference in channel quality of different UE on the different frequency bands of whole bandwidth, selective channel quality bandwidth assignment was preferably given corresponding UE; Thereby obtain the frequency selective scheduling gain, systematic function is highly improved.

In present TD-LTE system; Detection reference sequences (the SRS that the scheduling of upstream frequency selectivity is mainly sent UE according to base station (eNB); Sounding ReferenceSequence) and/or follow the demodulation reference sequences (DMRS of UE upstream data; Demodulation Reference Sequence) measurement, according to measurement result select performance preferably band resource distribute to UE; The scheduling of downstream frequency selectivity then mainly is that UE receives down public guide frequency; And public guide frequency measured; Then to eNB feedback channel quality indication (CQI, Channel Quality Indicator), eNB according to the CQI of UE feedback select performance preferably frequency band give UE.

Fig. 1 is the flow chart of upstream frequency selectivity dispatching method of the prior art.As shown in Figure 1, may further comprise the steps:

Step 101, behind the UE access network, network side is that UE configuration SRS sends parameter through signaling.

In this step, SRS sends parameter and comprises: the transmission bandwidth of SRS, frequency domain position, frequency modulation pattern, sending duration, transmission cycle and vertical shift, transmission pectination etc.

Step 102, UE sends SRS according to the parameter configuration of network side on the frequency band that distributes, subframe.

Step 103, the DMRS that the eNB of network side receives the SRS of UE transmission and/or follows upstream data to send measures, thereby obtains the channel quality of each UE on special frequency band.

In this step, the method for measurement at first is that detected SRS and/or DMRS are carried out channel estimating, and through channel estimation results is measured, obtains Signal to Interference plus Noise Ratio (SINR) or signal to noise ratio (snr) that SRS and/or DMRS send each PRB on the bandwidth.The SINR of these PRB or SNR promptly as the foundation of frequency selective scheduling, when eNB dispatches to UE, preferentially select the high PRB of SINR or SNR to distribute to UE.

Step 104, eNB sorts by the channel quality quality to the PRB that has measured in the up-link bandwidth according to the measurement result of single or multiple.

In general, send bandwidth for SRS, eNB sends for single UE configuration full bandwidth or the part bandwidth is sent.

If adopt full bandwidth to send; Then UE is in a SRS sends; Take whole bandwidth, and network side is also through measuring the disposable channel information of this UE on whole bandwidth that obtain to the SRS on the whole bandwidth; Be that eNB can in time obtain the channel information of certain UE on whole frequency, help frequency selective scheduling this UE; But; If this UE just in time is in cell edge; Because the transmitted power of UE is limited, the UE full bandwidth sends the reduction that SRS must cause average transmitting power, causes SRS to detect mis-behave; The channel situation that can't truly reflect this UE each PRB on the whole system bandwidth, the performance of reduction frequency selective scheduling.In addition, if at a SRS delivery time, single UE adopts the full bandwidth send mode; The UE quantity that can send SRS in the sub-district is simultaneously sharply reduced, cause eNB can not in time obtain the channel situation of most of UE on whole frequency band in the sub-district, when frequency selective scheduling; Can not reasonably distribute suitable frequency band for each UE; Can't obtain frequency selective scheduling gain preferably, can not obtain multi-subscriber dispatching gain preferably, cause the reduction of whole system performance.

If adopt partial-band to send SRS, then UE need repeatedly send SRS, and eNB could obtain the channel quality of this UE on whole frequency band.The shortcoming of this scheme is: because UE once can only send SRS on partial-band; The channel quality that obtains on the whole scheduling bandwidth need repeatedly send SRS; When channel variation was very fast, for example when UE was in the fast moving process, the channel quality of repeatedly measuring is the channel situation constantly of reflection scheduling timely truly; Thereby cause eNB can not with channel quality preferably bandwidth assignment give corresponding UE, can not obtain desired frequency selectivity scheduling gain.

Step 105, eNB is according to dispatching algorithm, and when this UE need be scheduled, the data amount information that request is sent according to UE in conjunction with the measurement of eNB to each PRB quality of reception on the upstream bandwidth, was selected suitable PRB resource, distributes to this UE.Process ends.

The scheduling of downstream frequency selectivity; Similar on the principle with the scheduling of upstream frequency selectivity; Difference is because eNB can't directly measure down channel, so the channel quality of each PRB need be measured by UE on the downlink bandwidth, reports eNB through the control signaling then.According to present 3GPP LTE agreement regulation, at down direction, eNB can be fixed on and send sub-district common reference pilot frequency sequence (CRS in each descending sub frame; Cell-SpecificReference Sequence); UE receives descending CRS, and CRS is detected and channel estimating, measures SINR or the SNR of each PRB; Thereby obtain the channel quality of whole downlink bandwidth; UE is mapped as CQI to the SINR or the SNR that measure, reports eNB through Physical Uplink Control Channel (PUCCH) or physical uplink data channel (PUSCH), and idiographic flow is as shown in Figure 2.

Fig. 2 is the flow chart of downstream frequency selectivity dispatching method of the prior art.As shown in Figure 2, may further comprise the steps:

Step 201, eNB is that UE disposes the CQI measurement parameter and reports pattern in the sub-district.

Step 202, UE measures according to CQI and reports parameter configuration, and descending CRS is received detection, measures the SNR of each downlink physical Resource Block, and according to the CQI reporting types, SNR is mapped to CQI, reports eNB.

Measure for CQI, system can be divided into subband set S with whole bandwidth, and this subband set S is made up of a plurality of subbands, and it is relevant with system bandwidth that the PRB that each subband comprises counts k.If UE is configured to report broadband CQI, then the SNR of UE each RPB that whole downlink bandwidth is measured averages, and is mapped to broadband CQI, and this broadband CQI value is reported eNB.If the reporting types of UE is configured to the subband CQI of high-rise configuration; Then UE is except needs report a broadband CQI; Also need report the CQI of each subband, subband CQI adopts the coded system of difference, and promptly the value of reporting of subband CQI is the difference of subband CQI and broadband CQI.If the subband CQI that adopts UE to select reports; Then UE also need be in subband set S except needs report a broadband CQI, preferred M subband; Calculate a CQI and report the same mode that adopts actual measurement CQI and broadband CQI differential coding of the value of reporting of this CQI to this M subband.

Step 203, eNB receives the CQI that UE reports, and obtains the channel quality of each PRB on the whole downlink bandwidth.

Step 204, eNB sorts by channel quality to all PRB that measured on the downstream bands according to the CQI measurement result of single or multiple.

Step 205, eNB is based on dispatching algorithm, and when this UE need be scheduled, the CQI based on this UE feedback selected suitable PRB resource, sent downlink data for this UE.Process ends.

Dispatch for the downstream frequency selectivity; Because up signalling bandwidth is limited; Therefore UE is to the measurement and report of CQI, can't be by the mode reporting measurement value of each PRB, and can only report by the mode of subband; Cause the channel information of the downlink bandwidth that network side collects complete inadequately and accurate like this, can't truly reflect the channel quality of each PRB; In addition, because report cycle or reporting time delay restriction, eNB when channel variation is very fast, can not obtain desired frequency selectivity scheduling gain when carrying out descending scheduling.Particularly when the subband CQI that adopts UE to select reports pattern like this; M the subband that UE can only select oneself to think optimum reports; But eNB is when dispatching, might priority scheduling other UE, and to this UE; Part or whole PRB have been used by other UE in the M of its selection subband, cause carrying out frequency selective scheduling.

It is thus clear that, in existing frequency selective scheduling scheme,, receive SRS to send restrictions such as bandwidth and transmission cycle for up, be difficult in and obtain the complete channel information of UE in the scheduling interval, cause reaching perfect performance; For descending, the CQI of UE feedback is influenced by feedback resources, can't feed back effective information sooner more accurately, and the channel information that obtains when causing the scheduling of downstream frequency selectivity is insufficient, and scheduling performance descends.In sum, the performance of existing frequency selectivity dispatching method is lower.

Summary of the invention

The invention discloses a kind of frequency selectivity dispatching method, this method has improved the performance of frequency selective scheduling.

The invention also discloses a kind of base station, the performance of frequency selective scheduling has been improved in this base station.

For achieving the above object, technical scheme of the present invention is achieved in that

The invention discloses a kind of frequency selectivity dispatching method, this method is applied in the TDD system, and for a user equipment (UE), this method comprises:

The channel quality indicator (CQI) measured value that the base station reports according to this UE, the channel quality of each the Physical Resource Block PRB in the acquisition descending sub frame;

The detection reference sequences SRS that send according to this UE the base station, and/or the demodulation reference sequences DMRS that follows upstream data to send, the channel quality of each PRB in the acquisition sub-frame of uplink;

When in upstream frequency selectivity when scheduling, need be carried out to this UE in the base station, according to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, for this UE distributes up PRB;

And/or,

When in downstream frequency selectivity when scheduling, need be carried out to this UE in the base station, according to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, be this UE allocation of downlink PRB.

The invention also discloses a kind of base station, this base station comprises: down channel quality module, uplink signal-channel quality module and frequency selective scheduling module, wherein,

The down channel quality module is used for the CQI measured value that reports according to UE, obtains the channel quality of each PRB in the descending sub frame, and sends to the frequency selective scheduling module;

The uplink signal-channel quality module is used for the SRS according to said UE transmission, and/or the DMRS that follows upstream data to send, and obtains the channel quality of each PRB in the sub-frame of uplink, and sends to the frequency selective scheduling module;

The frequency selective scheduling module; Be used for when needs carry out the scheduling of upstream frequency selectivity to said UE; According to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, for this UE distributes up PRB; And/or, be used for said UE being carried out downstream frequency selectivity when scheduling at needs, according to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, be this UE allocation of downlink PRB.

By above-mentioned visible, the CQI measured value that this base station of the present invention reports according to this UE, the SRS that obtains the channel quality of each PRB in the descending sub frame, sends according to this UE; And/or the DMRS that follows upstream data to send; Obtain the channel quality of each PRB in the sub-frame of uplink, and at needs this UE is carried out up/during the scheduling of downstream frequency selectivity, according to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB; The technical scheme of distributing up/descending PRB for this UE; When carrying out frequency selective scheduling, out-hole run information and down-run survey information have been made full use of, with respect to the technical scheme of only using unidirectional metrical information in the prior art; The information of obtaining is accurate more and comprehensive, thereby has improved the performance of frequency selective scheduling.

Description of drawings

Fig. 1 is the flow chart of upstream frequency selectivity dispatching method of the prior art;

Fig. 2 is the flow chart of downstream frequency selectivity dispatching method of the prior art;

Fig. 3 is the flow chart of a kind of frequency selectivity dispatching method in the embodiment of the invention;

Fig. 4 is the composition structure chart of a kind of base station of the embodiment of the invention.

Embodiment

Core concept of the present invention is to utilize the reciprocity principle of uplink and downlink in time division duplex (TDD) system; In the frequency selective scheduling of TD-LTE; Comprehensive out-hole run information and down-run survey information; So that complete sum obtains the channel quality letter of each PRB on the whole system bandwidth more in time more, thereby ascending resource distributes and downlink resource distributes for UE carries out more exactly.Be that example is elaborated below with Fig. 3.

Fig. 3 is the flow chart of a kind of frequency selectivity dispatching method in the embodiment of the invention.As shown in Figure 3, may further comprise the steps for the frequency selectivity dispatching method of some UE:

Step 301, the channel quality indicator (CQI) measured value that the base station reports according to this UE, the channel quality of each the Physical Resource Block PRB in the acquisition descending sub frame.

In this step, can directly be corresponding CQI, also can CQI be mapped as SNR through the method for mapping to the basis for estimation of the channel quality of PRB.

Step 302, base station obtain the channel quality of each PRB in the sub-frame of uplink according to the SRS of this UE transmission and/or the demodulation reference sequences DMRS that follows upstream data to send.

Channel quality can adopt SNR to characterize, and SNR is big more, and channel quality is good more.

In the TDD system, in the TD-LTE system, uplink and downlink are with the shared bandwidth of time division way, so each PRB is each PRB in the sub-frame of uplink in the descending sub frame, and just these PRB are used for up transmission and descending transmission in different time.

Step 303, in certain scheduling of this UE constantly, the base station collect each PRB in the descending sub frame in the fixed time channel quality and should the sub-frame of uplink in the fixed time in the channel quality of each PRB.

In this step, certain scheduling of this UE is meant when need carry out the upstream or downstream frequency selective scheduling to this UE constantly.

In the step; The said fixed time is meant and dispatches constantly relevant a period of time, that is to say that the channel quality information in this correlation time is contributive when carrying out frequency selective scheduling; If channel variation is fast more, then constantly relevant with the scheduling time period is just short more.Correlation time, T can be provided with based on channel variance situation.

Step 304, the base station according to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, be that this UE distributes up and/or descending PRB.

After integrated treatment is carried out to the channel quality of each PRB of up-downgoing of obtaining in the base station in this step,, be specially: for a PRB as the foundation up and/or scheduling of downstream frequency selectivity i, establish this PRB iUp SNR value in the said fixed time (being T correlation time) is SNR u PRB-i, establish this PRB iDescending SNR value in the said fixed time is SNR d PRB-i, then calculate this PRB through following formula iComprehensive SNR value SNR PRB-i:

SNR PRB - i = p × SNR u PRB - i + ( 1 - p ) × SNR d PRB - i - - - ( 1 )

Wherein, i=1,2 ..., N, N is the sum of the RPB that comprised of whole system bandwidth, p is the arbitrary value between 0 to 1;

Then, according to the comprehensive SNR value of each PRB each PRB being sorted, is that UE distributes up and/or descending PRB according to ranking results, promptly when being dispatched to this UE, from the PRB of free time, selecting top-quality continuous P RB piece and distributes to this UE.For example, finding the highest PRB of comprehensive SNR value, is that starting point is distributed the up and/or descending PRB of M continuous PRB as this UE with this PRB, and wherein, M is the required PRB quantity of this UE; Perhaps, find out the maximum M of a total signal strength continuous PRB, distribute to this UE, promptly calculate the total signal strength of PRB collection, select the maximum PRB collection of signal strength signal intensity to distribute to this UE with sliding window M as up and/or descending PRB.

In the above-described embodiments, for a PRB iIf, in the said fixed time, at sub-frame of uplink corresponding channel measured value (promptly having corresponding SRS and/or DMRS to send) is arranged, but do not have corresponding CQI to report, then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, p gets 1; If in the said fixed time, do not have corresponding up channel measured value, but have corresponding CQI to report, then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, P gets 0; If in the said fixed time, the up channel measured value of existing correspondence also has corresponding CQI to report, and is then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, p gets greater than 0 less than 1 value, and the value of p can be confirmed through emulation particularly.

In an embodiment of the present invention, when UE being carried out the scheduling of upstream frequency selectivity, mainly still consider the up SNR value of each PRB, promptly p gets the value greater than 0.5 in formula (1); When this UE being carried out the scheduling of downstream frequency selectivity, mainly consider the descending SNR value of each PRB, promptly p gets the value less than 0.5.

According to the foregoing description, next provide the structure chart of a kind of base station among the present invention.

Fig. 4 is the composition structure chart of a kind of base station of the embodiment of the invention.As shown in Figure 4, this base station comprises: down channel quality module 401, uplink signal-channel quality module 402 and frequency selective scheduling module 403, wherein:

Down channel quality module 401 is used for the CQI measured value that reports according to UE, obtains the channel quality of each PRB in the descending sub frame, and sends to frequency selective scheduling module 403;

Uplink signal-channel quality module 402, the demodulation reference sequences DMRS that is used for the SRS that sends according to said UE and/or follows upstream data to send obtains the channel quality of each PRB in the sub-frame of uplink, and sends to frequency selective scheduling module 403;

Frequency selective scheduling module 403; Be used for when needs carry out the scheduling of upstream frequency selectivity to said UE; According to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, for this UE distributes up PRB; And/or, be used for this UE being carried out downstream frequency selectivity when scheduling at needs, according to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, be this UE allocation of downlink PRB.

In Fig. 4, said down channel quality module 401, the CQI measured value that is used for this UE is reported is mapped to the signal to noise ratio snr value, and the PRB collection corresponding according to the CQI measured value, obtains the descending SNR value of each concentrated PRB of PRB; Said uplink signal-channel quality module 402, the demodulation reference sequences DMRS that is used for the SRS that said UE is sent and/or follows upstream data to send measures, and obtains the up SNR value of each PRB.

In Fig. 4, for a PRB i, establish this PRB iUp SNR value in the said fixed time is SNR u PRB-i, establish this PRB iDescending SNR value in the said fixed time is SNR d PRB-i, then said frequency selective scheduling module 403 is used for calculating this PRB through following formula iComprehensive SNR value SNR PRB-i:

SNR PRB - i = p × SNR u PRB - i + ( 1 - p ) × SNR d PRB - i ;

Wherein, i=1,2 ..., N, N is the sum of RPB, p is the arbitrary value between 0 to 1;

Said frequency selective scheduling module 403 is used for according to the comprehensive SNR value of each PRB each PRB being sorted, and is that UE distributes up PRB according to ranking results; And/or, be used for each PRB being sorted according to the comprehensive SNR value of each PRB, be UE allocation of downlink PRB according to ranking results.

In Fig. 4; Said frequency selective scheduling module 403 is used to find the highest PRB of comprehensive SNR value, is that starting point is distributed the up PRB of M continuous PRB as said UE with this PRB; Wherein M is the required PRB quantity of this UE; Perhaps, be used to find out the maximum M of a total signal strength continuous PRB, distribute to said UE as up PRB; And/or, be used to find the highest PRB of comprehensive SNR value, be that starting point is distributed the descending PRB of M continuous PRB as said UE with this PRB; Wherein M is the required PRB quantity of this UE; Perhaps, be used to find out the maximum M of a total signal strength continuous PRB, distribute to the descending PRB of said UE conduct.

In Fig. 4, said frequency selective scheduling module 403 is used for for a PRB iIf, in the said fixed time, there are corresponding SRS and/or DMRS to send, but do not have corresponding CQI to report, then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, p gets 1; If between said appointment, do not have corresponding SRS and/or DMRS to send, but have corresponding CQI to report, then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, P gets 0; If in the said fixed time, the SRS of existing correspondence and/or DMRS send, and also have corresponding CQI to report, and are then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, p gets greater than 0 less than 1 value; Wherein, when this UE being carried out the scheduling of upstream frequency selectivity, p gets the value greater than 0.5 in one embodiment of the present of invention, and when this UE being carried out the scheduling of downstream frequency selectivity, p gets the value less than 0.5.

In sum, the CQI measured value that this base station of the present invention reports according to this UE, the SRS that obtains the channel quality of each PRB in the descending sub frame, sends according to this UE; And/or the demodulation reference sequences DMRS that follows upstream data to send; Obtain the channel quality of each PRB in the sub-frame of uplink, and at needs this UE is carried out up/during the scheduling of downstream frequency selectivity, according to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB; The technical scheme of distributing up/descending PRB for this UE; When carrying out frequency selective scheduling, out-hole run information and down-run survey information have been made full use of, with respect to the technical scheme of only using unidirectional metrical information in the prior art; The information of obtaining is accurate more and comprehensive, thereby has improved the performance of frequency selective scheduling.

The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.

Claims (8)

1. a frequency selectivity dispatching method is characterized in that, this method is applied in the TDD system, and for a user equipment (UE), this method comprises:
The channel quality indicator (CQI) measured value that the base station reports according to this UE, the channel quality of each the Physical Resource Block PRB in the acquisition descending sub frame;
The detection reference sequences SRS that send according to this UE the base station, and/or the demodulation reference sequences DMRS that follows upstream data to send, the channel quality of each PRB in the acquisition sub-frame of uplink;
When in upstream frequency selectivity when scheduling, need be carried out to this UE in the base station, according to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, for this UE distributes up PRB;
And/or,
When in downstream frequency selectivity when scheduling, need be carried out to this UE in the base station, according to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, be this UE allocation of downlink PRB; Wherein:
The CQI measured value that said base station reports based on this UE; The channel quality that obtains each PRB in the descending sub frame comprises: the base station is mapped to the signal to noise ratio snr value with the CQI measured value that this UE reports; And, obtain the descending SNR value of each concentrated PRB of PRB based on the corresponding PRB collection of CQI measured value;
Said base station is based on the SRS of this UE transmission and/or the demodulation reference sequences DMRS that follows upstream data to send; The channel quality that obtains each PRB in the sub-frame of uplink comprises: the base station is measured SRS and/or the DMRS that this UE sends, and obtains the up SNR value of each PRB;
Said according to each PRB in the descending sub frame in the fixed time channel quality and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, comprise for this UE distributes up PRB: for a PRB i, establish this PRB iUp SNR value in the said fixed time does If this PRB iDescending SNR value in the said fixed time does Then calculate this PRB through following formula iComprehensive SNR value SNR PRB-i:
wherein; I=1,2 ..., N; N is the sum of RPB, and p is the arbitrary value between 0 to 1;
Comprehensive SNR value according to each PRB sorts to each PRB, is that UE distributes up PRB according to ranking results;
Said according to each PRB in the descending sub frame in the fixed time channel quality and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, PRB comprises for this UE allocation of downlink: for a PRB i, establish this PRB iUp SNR value in the said fixed time does If this PRB iDescending SNR value in the said fixed time does Then calculate this PRB through following formula iComprehensive SNR value SNR PRB-i:
wherein; I=1,2 ..., N; N is the sum of RPB, and p is the arbitrary value between 0 to 1;
Comprehensive SNR value according to each PRB sorts to each PRB, is UE allocation of downlink PRB according to ranking results.
2. method according to claim 1 is characterized in that,
Said comprehensive SNR value according to each PRB sorts to each PRB; According to ranking results is that UE distributes up PRB to comprise: find the highest PRB of comprehensive SNR value; With this PRB is that starting point is distributed the up PRB of M continuous PRB as this UE, and wherein, M is the required PRB quantity of this UE; Perhaps, find out the maximum M of a total signal strength continuous PRB, distribute to this UE as up PRB;
Said comprehensive SNR value according to each PRB sorts to each PRB; According to ranking results is that UE allocation of downlink PRB comprises: find the highest PRB of comprehensive SNR value; With this PRB is that starting point is distributed the descending PRB of M continuous PRB as this UE, and wherein, M is the required PRB quantity of this UE; Perhaps, find out the maximum M of a total signal strength continuous PRB, distribute to this UE as descending PRB.
3. method according to claim 1 and 2 is characterized in that, for a PRB i:
If in the said fixed time, there are corresponding SRS and/or DMRS to send, but do not have corresponding CQI to report, then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, p gets 1;
If between said appointment, do not have corresponding SRS and/or DMRS to send, but have corresponding CQI to report, then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, P gets 0;
If in the said fixed time, the SRS of existing correspondence sends, and also has corresponding CQI to report, and is then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, p gets greater than 0 less than 1 value.
4. method according to claim 3 is characterized in that, if in the said fixed time, the SRS of existing correspondence sends, and also has corresponding CQI to report, and is then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, p gets greater than 0 and comprises less than 1 value:
When UE being carried out the scheduling of upstream frequency selectivity, p gets the value greater than 0.5; When this UE being carried out the scheduling of downstream frequency selectivity, p gets the value less than 0.5.
5. a base station is characterized in that, this base station comprises: down channel quality module, uplink signal-channel quality module and frequency selective scheduling module, wherein,
The down channel quality module is used for the CQI measured value that reports according to UE, obtains the channel quality of each PRB in the descending sub frame, and sends to the frequency selective scheduling module;
The uplink signal-channel quality module, the DMRS that is used for the SRS that sends according to said UE and/or follows upstream data to send obtains the channel quality of each PRB in the sub-frame of uplink, and sends to the frequency selective scheduling module;
The frequency selective scheduling module; Be used for when needs carry out the scheduling of upstream frequency selectivity to said UE; According to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, for this UE distributes up PRB; And/or, be used for this UE being carried out downstream frequency selectivity when scheduling at needs, according to the channel quality of each PRB in the descending sub frame in the fixed time and should the sub-frame of uplink in the fixed time in the channel quality of each PRB, be this UE allocation of downlink PRB; Wherein:
Said down channel quality module, the CQI measured value that is used for this UE is reported is mapped to the signal to noise ratio snr value, and the PRB collection corresponding according to the CQI measured value, obtains the descending SNR value of each concentrated PRB of PRB;
Said uplink signal-channel quality module is used for SRS and/or DMRS that said UE sends are measured, and obtains the up SNR value of each PRB;
For a PRB i, establish this PRB iUp SNR value in the said fixed time does If this PRB iDescending SNR value in the said fixed time does
Then said frequency selective scheduling module is used for calculating this PRB through following formula iComprehensive SNR value SN RPRB-i:
Wherein, i=1,2 ..., N, N is the sum of RPB, p is the arbitrary value between 0 to 1;
Said frequency selective scheduling module is used for according to the comprehensive SNR value of each PRB each PRB being sorted, and is that UE distributes up PRB according to ranking results; And/or, be used for each PRB being sorted according to the comprehensive SNR value of each PRB, be UE allocation of downlink PRB according to ranking results.
6. base station according to claim 5 is characterized in that,
Said frequency selective scheduling module; Be used to find the highest PRB of comprehensive SNR value; With this PRB is that starting point is distributed the up PRB of M continuous PRB as said UE, and wherein M is the required PRB quantity of this UE, perhaps; Be used to find out the maximum M of a total signal strength continuous PRB, distribute to said UE as up PRB; And/or, be used to find the highest PRB of comprehensive SNR value, be that starting point is distributed the descending PRB of M continuous PRB as said UE with this PRB; Wherein M is the required PRB quantity of this UE; Perhaps, be used to find out the maximum M of a total signal strength continuous PRB, distribute to said UE as descending PRB.
7. according to claim 5 or 6 described base stations, it is characterized in that,
Said frequency selective scheduling module is used for for a PRB iIf, in the said fixed time, there are corresponding SRS and/or DMRS to send, but do not have corresponding CQI to report, then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, p gets 1; If between said appointment, do not have corresponding SRS and/or DMRS to send, but have corresponding CQI to report, then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, p gets 0; If in the said fixed time, the SRS of existing correspondence and/or DMRS send, and also have corresponding CQI to report, and are then calculating this PRB iComprehensive SNR value SNR PRB-iThe time, p gets greater than 0 less than 1 value.
8. base station according to claim 7 is characterized in that, for a PRB iIf in the said fixed time, the SRS of existing correspondence and/or DMRS send, also there is corresponding CQI to report, then calculating this PRB iComprehensive SNR value SNR PRB-iThe time,
Said frequency selective scheduling module, when this UE being carried out the scheduling of upstream frequency selectivity, p gets the value greater than 0.5, and when this UE being carried out the scheduling of downstream frequency selectivity, p gets the value less than 0.5.
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