CN101431791B - HSPA power distribution method, system and apparatus - Google Patents
HSPA power distribution method, system and apparatus Download PDFInfo
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Abstract
The invention claims a HSPA power distribution method, a device and a system. The method comprises steps of: receiving a channel condition indication reported and estimated by user equipment UE; calculating a power difference of currently available maximal power and a channel power for estimating the channel condition indication; determining an available maximal channel condition indication and corresponding transmission block size TBS combined with the channel condition indication reported by the UE via a detailed channel condition indication mapping relationship according to calculated power difference; distributing the HSPA power required by the TBS to the TBS. Technical solution of the embodiment of the invention can improve a distribution power of a subdistrict available power distribution, reduce waste of resources, improve a throughput rate of the subdistrict and improve integral performance of the system.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly relate to a kind of HSPA power distribution method, system and device.
Background technology
Along with the development of mobile communication technology, 3G technology is also in constantly development evolution.Manyly need system that higher transmission rate and shorter time delay are provided to flow and data service such as video, Streaming Media and the download etc. of delaying having relatively high expectations, high speed downlink packet inserts (High Speed Downlink Packet Access, be called for short " HSDPA ") and high speed uplink packet to insert (High Speed Uplink Packet Access, abbreviation " HSUPA ") be exactly the important evolution of 3G technology.Be different from the scheduling and the re-transmission of packet in the R99 version, the scheduling of packet and re-transmission etc. are by base stations control among HSDPA and the HSUPA, and this control faster better adaptive channel changes, and reduces propagation delay time, increases data throughout.
HSDPA adopts shorter Transmission Time Interval (Transmission Timing Interval, be called for short " TTI ") and frame length (2ms or 10ms) to realize quick self-adapted control, use adaptive coding and modulation (Adaptive Modulation and Coding in physical layer, be called for short " AMC ") and mix automatic repeat requests (Hybrid Auto Repeat reQuest, be called for short " HARQ "), introduce 16 rank quadrature amplitude modulations (Quadrature Amplitude Modulation is called for short " QAM ") modulation and improve the availability of frequency spectrum.Among the HSDPA, the HARQ technology adopts multi-process, uses stop-and-wait protocol (Stop And Wait is called for short " SAW "), and the user feeds back the ACK/NACK indication whether designation data correctly receives after receiving data, so that the base station decision retransmits or the transmission new data.The descending channel quality indication (Channel Quality Indicator is called for short " CQI ") that AMC specification requirement user feedback measures is so that the base station determines the code rate and the transformat of descending HSDPA data.
After HSDPA, HSUPA has been incorporated in 2004 in the version of 3GPP the 6th edition (Release 6, are called for short " R6 ") as the high speed uplink data packet access technique.Be similar to HSDPA, HSUPA adopts shorter TTI and frame length (2ms or 10ms) to realize quick self-adapted control, uses HARQ and based on the fast uplink dispatching technique of base station, has improved up spectrum efficiency.
From 3GPP (3rd Generation Partnership Project, third generation partner program) begin to introduce HSDPA from R5 (3GPP Release 5 agreements) since, network side is by high-speed downstream physical channel HS-PDSCH (High Speed Physical Data Sharing Channel in HSDPA, high-speed physical data sharing channel) transmits data for the user, use HS-SCCH (High Speed SharingControl Channel, High-Speed Shared Control Channel) control channel of following as HS-PDSCH, the relevant control information of indication HS-PDSCH.UE (User Equipment, subscriber equipment) side uses up HS-DPCCH to report CQI (Channel Quality Indicator, channel condition indication) to give network side, the residing channel circumstance of indication current UE.
30 CQI values in above-mentioned R5 agreement, have been defined, wherein the combination of each indication of CQI value a TBS (Transmit Block Size, transmission block size), the number of channel and modulation system.When UE reported some CQI values, this CQI value representation was under current channel condition, and network uses the combination of CQI to TBS, the number of channel and the modulation system of this UE indication.Can guarantee that in AWGN (additive white Gaussian noise) channel UE receives this TBS with 10% BLER (Block Error Rate, Block Error Rate).Because the correct probability of acceptance of TBS and the SNR (Single Noise Ratio, signal to noise ratio) of reception are relevant, therefore CQI can be mapped as the combination of TBS, the number of channel and modulation system, simultaneously also corresponding to certain SNR value.Just can improve the SNR value by improving transmitting power like this, also can increase the size of TBS.
3GPP begins to introduce HSDPA 64QAM (64Quadratureamplitude modulation, octal system quadrature amplitude modulation, a kind of high-order debud mode) from R7 (3GPP Release 7 agreements).With respect to R5HSDPA, the main variation is that downstream data channel HS-PDSCH introduces new modulation system 64QAM, and changed the mapping relations of CQI-SNR.
As shown in Figure 1, be the schematic diagram that concerns of CQI and SNR among prior art R5 and the R7HSDPA 64QAM, the relation of CQI and SNR is that step pitch increases with 1dB in R5HSDPA; And in R7HSDPA 64QAM, it was that step pitch increases less than 25 o'clock with 1dB that the pass of CQI and SNR ties up to CQI, was that step pitch increases being higher than at 25 o'clock with 2dB.
In realizing embodiment of the invention process, the inventor finds that there are the following problems at least in the prior art: existing power distribution method is subject to the step pitch of CQI, such as, when the CQI step pitch is 2dB, if the sub-district available horsepower is than the high 1.5dB of power P cpich+MPO+DeltaCqiSNR (dBw) of current dispensed, then owing to the power that quantizes this 1.5dB of reason can't dispense.If in the following example dB is converted to linear percentage, just can find out the waste of resource very big.For example: supposition sub-district HS-PDSCH available horsepower is 11.5dB, Pcpich+MPO is 10dBw, the CQI of current R7HSDPA64QAM reporting of user is 25, and then network side calculates the distribution power P cpich+MPO+DeltaCqiSNR of HS-PDSCH, and the DeltaCqiSNR maximum can only be 1.5dB.And CQI is 25 o'clock (being that step pitch increases greater than 25 o'clock with 2dB as shown in Figure 1), if raise CQI, corresponding SNR is changed to 2dB, surpasses the maximum of current DeltaCqiSNR, therefore can only distribute power with DeltaCqiSNR=0 this moment.The actual allocated performance number of calculating is 10w, and sub-district HS-PDSCH available horsepower is 14w, thereby has wasted 40% power.
Summary of the invention
The problem that the embodiment of the invention will solve provides a kind of HSPA power distribution method, system and device, to solve the transmitting power that can't accurately adjust the base station in the prior art, causes power dissipation.
For achieving the above object, the embodiment of the invention proposes a kind of high-speed packet on the one hand and inserts the HSPA power distribution method, may further comprise the steps: receive the channel condition indication that user equipment (UE) is estimated and reported; Calculate the difference power of current available maximum power and channel condition indication used channel power when estimating; According to the difference power that calculates,,, determine maximum available channel condition indication and corresponding transmission block size TBS in conjunction with the channel condition indication that the UE that receives reports by the channel condition indication map relation of refinement; For this TBS that determines distributes the required HSPA power of this TBS of transmission.
On the other hand, the embodiment of the invention also provides a kind of base station of the HSPA of distribution power, and this base station comprises receiving element, is used to receive the channel condition indication that UE estimates and reports; Computing unit, the difference power of used channel power when being used to calculate current available maximum power and channel condition indication and estimating; Determining unit, be used for the difference power that calculates according to computing unit, by the channel condition indication map relation of refinement,, determine maximum available channel condition indication and corresponding transmission block size TBS in conjunction with the channel condition indication that the received UE of receiving element reports; Allocation units are used to the determined TBS of determining unit to distribute the required HSPA power of this TBS of transmission.
Again on the one hand, the embodiment of the invention also provides a kind of HSPA power distribution system, and this system comprises user equipment (UE), and above-mentioned base station, and wherein, described UE is used to estimate and the channel condition that reports is indicated to this base station.
The technical scheme of the embodiment of the invention adopts the channel condition indication map of refinement to concern, determines the maximum available channel condition indication and the TBS of correspondence, and is that this TBS that determines distributes the required HSPA power of this TBS of transmission.Therefore, less than normal, the insufficient problem of power division of actual selection TBS that can avoid the restriction owing to the CQI quantization step to cause, thus the allocative efficiency that the sub-district available horsepower is distributed can be improved, reduce the waste of resource, improve the throughput of sub-district, increase the entire system performance.
Description of drawings
Fig. 1 be among prior art R5 and the R7 among the HSDPA CQI and SNR concern schematic diagram;
Fig. 2 is an embodiment of the invention HSPA power distribution method flow chart;
Fig. 3 is the not power division schematic diagram of refinement of prior art;
Fig. 4 is the power division schematic diagram after the embodiment of the invention refinement;
Fig. 5 is an embodiment of the invention difference algorithm schematic diagram;
Fig. 6 be prior art CQI not the TBS during refinement select schematic diagram;
Fig. 7 selects schematic diagram for the embodiment of the invention adopts the TBS after the CQI refinement;
Fig. 8 is an embodiment of the invention HSPA power distribution system structure chart.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail:
From Fig. 1, CQI is corresponding with SNR as can be seen, has certain quantitative relationship between CQI and SNR.Such as when CQI quantification step pitch is 1dB, the every increase one-level of CQI, SNR is with regard to corresponding increase 1dB; Simultaneously CQI again and have relation one to one between the TBS, a CQI value is corresponding to a TBS, the combination of code word and modulation system.Because that the SNR of CQI correspondence indication is the SNR that receives under the current channel when transmitted power is CPICH+MPO (dBw/dBm).So can improve SNR by improving through-put power, thereby reach the purpose that improves CQI.If yet SNR improve when not crossing over the quantification step pitch of CQI and SNR, CQI can not improve, TBS can not increase, finally the through-put power of selecting according to rating formula does not increase yet.
The network side scheduling is adjusted CQI according to current available transmitted power when having adequate data etc. to be transmitted, and the TBS that finds maximum to transmit is for the user is transmitted data.The fully lifting of using current available transmitted power can bring the sub-district throughput.And the quantitative relationship between CQI and the SNR causes transmitted power often can not fully to be used.The power dissipation that this quantitative relationship brings during the 2dB step pitch in R7HSDPA 64QAM is particularly evident.For example, suppose that current available horsepower can allow SNR increase 1.9dB, but because SNR is 2dB to the step pitch of CQI.Even can not make CQI increase by 1 grade so all power are all used, thereby TBS can not increase.Also can only rest on the level that current available horsepower deducts 1.9dB and calculate the through-put power that needs under the current C QI according to the computing formula of CQI and power.Therefore not only power does not fully use, and user rate does not reach maximization yet.
Under certain CQI, in requisition for the transmit power calculation formula be: Pcpich+MPO+DeltaCqiSNR (dBw), wherein Pcpich is sub-district CPICH (Common Pilot Channel, Common Pilot Channel) transmitting power, DeltaCqiSNR is the difference of the SNR of the CQI of current selection use and the CQI correspondence that UE reports.For example: the CQI of reporting of user is 10, and network side is adjusted into 12 and transmit data to CQI as required, and then DeltaCqiSNR is 2dB (graph of a relation of CQI-SNR as shown in Figure 1).For HSDPA 64QAM user, be 25 if report CQI, network side is adjusted into 26 and transmit data to CQI as required, the 2dB because the SNR of HSDPA 64QAM CQI25 and CQI 26 correspondences is separated by, so DeltaCqiSNR is 2dB.
For addressing the above problem, the embodiment of the invention provides a kind of HSPA power distribution method, may further comprise the steps:
Receive the channel condition indication that user equipment (UE) is estimated and reported; Calculate the difference power of current available maximum power and channel condition indication used channel power when estimating; According to the difference power that calculates,,, determine maximum available channel condition indication and corresponding transmission block size TBS in conjunction with the channel condition indication that the UE that receives reports by the channel condition indication map relation of refinement; For this TBS that determines distributes the required HSPA power of this TBS of transmission.
Wherein, the channel condition indication can be CQI.Channel condition indication map relation comprises: the CQI-SNR mapping relations of CQI and signal to noise ratio snr and the CQI-TBS mapping relations of CQI and TBS.
Can adopt following two kinds of thinkings to realize the details of the embodiment of the invention.
Mode one:
The CQI mapping relations of refinement comprise the refinement CQI-SNR mapping relations and the corresponding refinement CQI-TBS mapping relations of the quantification step pitch that employing is littler.In other words, the CQI-SNR mapping relations of refinement are the CQI-SNR mapping relations of the more small quantization granularity that minimizing CQI-SNR quantization granularities obtains on the basis of original CQI-SNR mapping relations, the CQI-TBS mapping relations of refinement are according to original CQI-TBS mapping relations, the TBS value of correspondence behind the refinement CQI that extrapolates.Wherein, more the step pitch of refinement such as is at a step pitch, or step pitch such as non-.
In this case, can search refinement CQI-SNR mapping relations,, determine to adjust the maximum available CQI value that obtains in conjunction with the CQI that the UE that receives reports according to the difference power that calculates; Further,, search refinement CQI-TBS mapping relations, obtain corresponding TBS according to the maximum available CQI value of determining.Can distribute power to the TBS that determines to obtain afterwards.
In addition, can also comprise the steps: to judge whether definite TBS is fit to the medium data volume waiting for transmission of buffer memory.Be not suitable for the medium data volume waiting for transmission of buffer memory if judge the TBS that determines, then reselect new TBS according to the medium data volume waiting for transmission of buffer memory.After medium data volume waiting for transmission is reselected new TBS according to buffer memory again, also need the TBS that is new to distribute power, specifically comprise: according to the new TBS that reselects, the refinement CQI value of the CQI-TBS mapping relationship searching correspondence by refinement; Obtain corresponding SNR according to refinement CQI value; Calculate the difference of the SNR of the CQI correspondence that this SNR and UE report; On the basis of the through-put power of when CQI estimates, using, add the difference of SNR, needing to obtain the power of distribution.
What deserves to be explained is, though adopt the channel condition indication map relation of refinement, determine maximum available channel condition indication and corresponding TBS, and be that the required HSPA power of this TBS is transmitted in this TBS that determines distribution, but in available power, still have unallocated part of going out, in the case, unappropriated available horsepower can be appended and distribute to each UE.
Mode two:
The CQI mapping relations of refinement are for passing through determined CQI-SNR mapping relations of interpolation calculation and corresponding C QI-TBS mapping relations.In such cases, determine that the specific implementation of CQI and TBS is: according to the difference power that calculates, the CQI in conjunction with the UE that receives reports by interpolation calculation, determines pairing CQI value and corresponding TBS value between two adjacent S NR.
In addition, can also comprise the steps: to judge whether definite TBS is fit to the medium data volume waiting for transmission of buffer memory.Be not suitable for the medium data volume waiting for transmission of buffer memory if judge the TBS that determines, then reselect new TBS according to the medium data volume waiting for transmission of buffer memory.After medium data volume waiting for transmission is reselected new TBS according to buffer memory again, also need specifically to comprise: according to the new TBS that reselects, by the SNR of interpolation calculation correspondence for new TBS distributes power; Calculate the difference of the SNR of the CQI correspondence that this SNR and UE report; On the basis of the through-put power of when CQI estimates, using, add the difference of above-mentioned SNR, needing to obtain the power of distribution.
An alternative embodiment of the invention provides a kind of base station of the HSPA of distribution power, comprising: receiving element is used to receive the channel condition indication that UE estimates and reports; Computing unit, the difference power of used channel power when being used to calculate current available maximum power and channel condition indication and estimating; Determining unit, be used for the difference power that calculates according to computing unit, by the channel condition indication map relation of refinement,, determine maximum available channel condition indication and corresponding transmission block size TBS in conjunction with the channel condition indication that the received UE of receiving element reports; Allocation units are used to the determined TBS of determining unit to distribute the required HSPA power of transmission TBS.
Same, can adopt dual mode:
Mode one: the CQI mapping relations of refinement comprise the refinement CQI-SNR mapping relations and the corresponding refinement CQI-TBS mapping relations of the quantification step pitch that employing is littler.
In such cases, determining unit comprises: first subelement, be used for the difference power that calculates according to computing unit, and search refinement CQI-SNR mapping relations, in conjunction with the CQI that the UE that receives reports, determine to adjust the maximum available CQI that obtains; Second subelement is used for the maximum available CQI definite according to first subelement, searches refinement CQI-TBS mapping relations, obtains corresponding TBS.
Same, if still have unappropriated available horsepower, the base station also comprises: append allocation units, be used for unappropriated available horsepower appended and distribute to each UE.
Further, this base station can also comprise: judging unit is used to judge whether the determined TBS of determining unit is fit to the medium data volume waiting for transmission of buffer memory, and judged result is sent to determining unit; Determining unit also is used to receive the judged result that judging unit sends, if the judged result of the judging unit that determining unit receives is that then determining unit also is not used for reselecting new TBS according to the medium data volume waiting for transmission of buffer memory.
Mode two: the CQI mapping relations of refinement are for passing through determined CQI-SNR mapping relations of interpolation calculation and corresponding C QI-TBS mapping relations.
In such cases, determining unit comprises the 3rd subelement, is used for according to the difference power that calculates, and the CQI in conjunction with the UE that receives reports by interpolation calculation, determines pairing CQI value and corresponding TBS value between two adjacent S NR.
Further, this base station also can also comprise: judging unit is used to judge whether the determined TBS of determining unit is fit to the medium data volume waiting for transmission of buffer memory, and judged result is sent to determining unit; Determining unit also is used to receive the judged result that judging unit sends, if the judged result of the judging unit that determining unit receives is that then determining unit also is not used for reselecting new TBS according to the medium data volume waiting for transmission of buffer memory.
Another embodiment of the present invention also provides a kind of HSPA power distribution system, comprises user equipment (UE) in this system, and above-mentioned base station, and wherein, UE is used to estimate and the channel condition that reports is indicated to this base station.
Below in the mode of specific embodiment, the scheme of the embodiment of the invention is described in detail:
As shown in Figure 2, be embodiment of the invention HSPA power distribution method flow chart, may further comprise the steps:
Step S201, UE periodically report the CQI of himself to the base station according to network configuration.
A kind of implementation of this step is: UE estimates according to current channel conditions, supposes that network side is with P
CPICHThe power of+MPO is in HS-PDSCH channel data, and then UE calculates the SNR (signal to noise ratio is used to weigh the quality of received signal) of HS-PDSCH channel.The SNR of data channel (HS-PDSCH) of estimation is mapped as CQI.In HSDPA R5, CQI definition has 30 values, and wherein CQI 1 is corresponding to-3.5dB, and the every increase one-level of CQI SNR adds 1dB, and corresponding to-2.5dB, CQI3 is corresponding to-1.5dB as CQI2; And for 64QAM among the R7HSPA+, greater than 25 o'clock, the every increase one-level of CQI then SNR can the corresponding 2dB that adds at CQI.Therefore UE can calculate corresponding C QI according to the SNR that obtains, and the CQI that measures is reported the base station with the HS-DPCCH channel.
Step S202, the base station receives the CQI that UE reports, and calculates the maximum CQI of described UE according to this CQI.
The MAC-hs or the MAC-ehs protocol entity that wherein are positioned at the base station are that UE selects transfer resource, these transfer resources mainly comprise modulation system, the HS-PDSCH number of channel (data channel code word number), TBS and through-put power etc., the HSDPA user who mainly is responsible for being scheduling in the sub-district is transmitted data.The embodiment of the invention mainly selects the base station that this UE is carried out TBS and the through-put power that transfer of data is used.Be specially: current maximum available power and P are calculated in the base station
CpichPoor (unit is dBw or dBm) of the dB value of+MPO power, wherein power P
CpichHS-PDSCH data channel power when+MPO is the CQI estimation.
By this power difference and CQI step pitch, calculate the adjustable progression of CQI.When difference＞0, CQI adjusts upward, and promptly increases the CQI value, otherwise reduces the CQI value.Typical computing formula is as follows:
When power difference＞0,
When power difference＜0,
The CQI of aforementioned calculation is adjusted progression and the CQI addition that UE reports, and just can obtain is that this UE transmits the operable maximum CQI values of data.Wherein, the normal step pitch of CQI is 1dB in the R5 agreement, or in the R7 agreement, the CQI value was 1dB less than 25 o'clock, and the CQI value was 2dB greater than 25 o'clock.The CQI value that reports as UE is 25, through calculating current HSDPA data channel available horsepower and P
CipchThe difference of the dB value of+MPO power is 1.5dB, if then so just can't adjust the CQI value according to the CQI-SNR step pitch (2dB) in the prior art this moment, also just can't improve the through-put power of down channel.
Therefore, can improve power division efficient by the CQI-SNR step pitch is carried out refinement.Original CQI form is 0-30, and it is that 25 following step pitches are 1dB that the pass of CQI and SNR ties up to CQI, and CQI is that 25 step pitches when above are 2dB.The embodiment of the invention can be by refinement CQI-SNR form, the CQI and the SNR mapping relations of small step distances such as realization 0.25,0.5dB or 1dB.For example, be example with the step pitch 0.5dB after the refinement, the CQI value that current UE reports is 23, through calculating current HSDPA data channel available horsepower and P
CipchThe difference of the dB value of+MPO power is 0.5dB, and the SNR that then searches CQI-SNR step pitch correspondence when the CQI value is 23 of above-mentioned refinement is 18.5dB, is 19dB behind the lifting 0.5dB, and the CQI adjusted value is 0.5, and the final CQI that determines is 23.5.
Step S203, the through-put power of the current needs of calculation base station.
According to the CQI value of current selection, according to formula P
Cpich+ MPO-SNR
ReportCQI+ SNR
SelectCQICalculate the through-put power of current needs, wherein SNR
ReportCQIBe the corresponding SNR of CQI value that reports, SNR
SelectCQBe the pairing SNR of CQI selective value.
As shown in Figure 3, be the prior art power division schematic diagram of refinement not; As shown in Figure 4, be the power division schematic diagram after the embodiment of the invention refinement.As can be seen from the figure the through-put power of wasting among Fig. 3 is far longer than the through-put power among Fig. 4.Because Fig. 4 adopts the step pitch after the refinement, at CQI
I+1-CQI
I+1.5Middle corresponding through-put power also has been assigned to UE, and therefore, the down channel through-put power of determining by the embodiment of the invention can cut the waste.
Step S204 obtains current C QI according to adjusted CQI-TBS expansion table and selects corresponding TBS.
Therefore the TBS that obtains like this can not only can reduce the waste of through-put power, and can improve transmission rate greater than the TBS that does not adopt CQI refinement step pitch to obtain.
The embodiment of the invention has proposed two kinds of modes of calculating TBS according to adjusted CQI value.
Mode one:
Original CQI form is 0-30, and it is that 25 following step pitches are 1dB that the pass of CQI and SNR ties up to CQI, and CQI is that 25 step pitches when above are 2dB.The embodiment of the invention can be by refinement CQI-TBS form, the CQI and the TBS mapping relations of small step distances such as realization 0.25,0.5dB or 1dB, and obtain the CQI-TBS expansion table of small step apart from following CQI and TBS.So just can improve transmission speed, increase the efficient that base station power distributes by reducing the quantification step pitch between the CQI-TBS.
As a preferred embodiment, the embodiment of the invention has proposed a kind of method of refinement CQI-TBS form.By calculate small step apart from the time relation between CQI and the SNR; Find TBS and the modulation system of small step by emulation again apart from the CQI correspondence.Base station scheduling just can select these small steps also to distribute more efficiently power with small step apart from CQI apart from the TBS of CQI correspondence like this.For example CQI-TBS expansion table (step pitch of refinement is 0.5dB) is as follows in R5HSDPA:
Wherein SNR 19dB and CQI 23.5 are one that CQI refinement interpolation increases, can search receiving HS-PDSCH SNR by emulation is 19dB, use 6 HS-PDSCH channel transmission datas, BLER is 10% transmission block size, therefore this TBS is customized to TBS2.
Divide timing at base station power, by selection TBS and CQI in the CQI of refinement table, thus the minimizing of realization power division quantization error, the lifting of power service efficiency, and transmission rate also gets a promotion.The CQI value that reports as current UE is 23, the difference that process is calculated the dB value of current HSDPA data channel available horsepower and Pcipch+MPO power is 0.5dB, then searching table SNR of correspondence when the CQI value is 23 is 18.5dB, behind the lifting 0.5dB is 19dB, the final CQI that determines is 23.5, according to above-mentioned CQI-TBS expansion table the TBS of this UE correspondence is customized to TBS2.Like this, when power division,, realize the minimizing of power division quantization error by in the CQI of refinement table, selecting TBS and CQI, the lifting of power service efficiency, and transmission rate also can access corresponding lifting.
Further, wherein the refinement of CQI step-length can give thinner step pitch to the frequent CQI value of using of part as required, can not refinement or adopt the refinement of bigger step pitch for the value of seldom using, that is to say that the refinement of CQI step-length can not wait the step pitch refinement.
And at HSPA+, the down high speed transmission time all has aforesaid CQI report the process of selecting with the network side scheduled transmission among the HSPA, so the embodiment of the invention is not limited among the HSDPA, all can use in HSPA and HSPA+.
Mode two:
According to the CQI adjusted value of determining, by the TBS of interpolation algorithm calculating to described UE.Because reduce power dissipation and increase transmission rate the most basic be to find the SNR of a suitable power division and the TBS of this SNR correspondence, therefore the embodiment of the invention also can be according to current available horsepower, need not existing C QI-TBS form is carried out refinement and expansion, according to directly obtaining SNR calculates the current SNR correspondence then according to the relation of quantization step SNR and corresponding TBS by interpolation algorithm TBS size.Thereby make the HSDPA power division distribute power with any step pitch, and choose relatively accurate TBS, realization power makes full use of the lifting with throughput.As shown in Figure 5, be embodiment of the invention interpolation algorithm schematic diagram.If current available horsepower is P
x, each CQI value in requisition for through-put power be P
CQIi, corresponding transmission block size is TBS
CQIiThen with P
CQIiBeing reference, is P by interpolation calculation power
xThe time, corresponding transmission block size TBS
xWherein interpolation method has multiplely, includes but not limited to linear interpolation, cubic interpolation etc.
Optionally, can further include following steps:
Step S205, the TBS of aforementioned calculation is further judged much larger than the wait data quantity transmitted in the base station whether, if, execution in step S207, if not, execution in step S206.
When waiting data to be transmitted inadequate, may be excessive according to the TBS that the sub-district available horsepower is selected, much larger than waiting for data quantity transmitted.Need be according to waiting for data quantity transmitted selection CQI and further computes transmit power.As shown in Figure 6, for prior art CQI not the TBS during refinement select schematic diagram; As shown in Figure 7, select schematic diagram for the TBS after the embodiment of the invention employing CQI refinement.In order to guarantee the data in the transmission buffer as much as possible, so will select the TBS bigger as far as possible than data volume in the buffer memory.Not during refinement, the TBS spacing is also bigger in the CQI-TBS expansion table at CQI, and the TBS principle bigger than normal according to foregoing selection selected TBS
I+1, and obtain corresponding CQI
I+1Calculate the power P ower that needs by CQI
I+1After adopting the CQI refinement, the TBS spacing also diminishes in the CQI-TBS table, can be seen under the identical wait data quantity transmitted by figure, has selected TBS
I+0.5, the CQI of this TBS correspondence is CQI
I+0.5The through-put power that calculates needs according to CQIi+0.5 is Power
I+0.5Power
I+0.5＜Power
I+1So, transmit identical data volume, adopt the CQI refinement more to save power.
Step S206 if the TBS of aforementioned calculation is not much larger than waiting for data quantity transmitted, is the TBS of UE correspondence with the TBS value that calculates then.
Step S207 is if the TBS of aforementioned calculation then according to the medium data volume waiting for transmission of buffer memory, reselects new TBS much larger than waiting for data quantity transmitted.
That is, select and the approaching TBS of the medium data volume waiting for transmission of buffer memory, but TBS is greater than the wait data quantity transmitted as far as possible.Such as, can select and the immediate TBS of wait data quantity transmitted in the CQI-TBS expansion table after expansion.
Step S208 according to the immediate TBS that above-mentioned steps is calculated, recomputates the CQI of this UE correspondence.
Can obtain corresponding CQI according to the CQI-TBS expansion table after the expansion.
Step S209 is according to the CQI computes transmit power that obtains among the step S208.
Wherein, preferably, the base station also can be appended unappropriated available horsepower and be distributed among each UE that inserts described base station in the above-described embodiments.For remaining unallocated power, for example, can append according to each user power ratio of current transmission and distribute to each user less than the unallocated power of CQI step pitch 1dB less than the CQI step pitch.The embodiment of the invention has provided a kind of mode of appending distribution, passes through formula
Calculating is appended to the power of each UE, wherein P
UE, jBe the power that j user distributes, P
TotalBe the total HS-PDSCH available horsepower in sub-district.By appending the distribution dump power, can fully use the HSDPA power of sub-district to increase the correct probability that receives of transmission data.The method of appending power has multiple, and above-mentioned formula is to be that weight is appended dump power in the transmission that is assigned to each UE with the power division ratio.Can also be that weight is appended distribution with transmission TBS, formula be as follows:
TBS wherein
UEjBe TBS to j UE transmission.The method of appending power should include but not limited to the method that the foregoing description is enumerated.
By the HSPA power distribution method of the foregoing description, can be by the lower quantization step pitch so that choose higher CQI, thus corresponding increase finally reaches the dual lifting of transmission rate and power division efficient to TBS and the through-put power of this UE.With sub-district HS-PDSCH available horsepower is 15.5dBw (being about 35.5), P
Cpich+ MPO is that 10dBw is an example, and the CQI of current R7HSDPA 64QAM reporting of user is 25, if current CQI step pitch is 2dB, can raise 2 grades of CQI.The power of actual allocated is 14dBw (being about 25.1w), and power dissipation is (35.5-25.1)/35.5=30% approximately.By the foregoing description refinement CQI value, reducing the CQI step pitch is 0.5dB, and the CQI that then can raise the 0.5dB step pitch is
Level, power makes full use of, not waste.High CQI chooses high TBS simultaneously, thereby promotes the current transmission rate of UE.And the embodiment of the invention can also improve the correct probability that receives of HSDPA transmission data by appending the distribution dump power.
As shown in Figure 8, be embodiment of the invention HSPA power distribution system structure chart, this distribution system comprises the UE2 of base station 1 and 1 service of at least one base station, and UE2 is used for reporting to base station 1 the CQI value of self; Base station 1 is used for the CQI value that reports according to base station 1 current available horsepower and UE2, calculates the whole CQI value of maximum adjustable by the CQI step pitch of refinement, and according to the down channel through-put power of the CQI value adjustment 1 couple of UE2 in base station.
Wherein, base station 1 comprises receiver module 11, CQI value computing module 12 and power regulation module 13, and receiver module 11 is used to receive the CQI value that UE2 reports; CQI value computing module 12 is used for the CQI value that reports according to the current available horsepower in base station and UE2, calculates the whole CQI value of maximum adjustable by the CQI step pitch of refinement; Power regulation module 13 is used for according to the down channel through-put power of CQI value computing module 12 adjusted CQI values adjustment to UE2.
Wherein, base station 1 also comprises CQI-TBS mapping block 14, is used under certain code word number, selects TBS according to the CQI value that described CQI value computing module 12 calculates by expansion CQI-TBS table, or selects CQI according to TBS by expansion CQI-TBS table.
Wherein, CQI-TBS mapping block 14 comprises the expansion table preservation submodule 141 and the submodule 142 of tabling look-up, expansion table is preserved submodule 141 and is used to preserve the CQI-TBS expansion table of refinement, the CQI-TBS expansion table of refinement is by emulation or calculates in advance that this table has provided the CQI of refinement and the relation between the TBS; The submodule 142 of tabling look-up is used for looking into CQI-TBS table according to the CQI adjusted value and preserves CQI-TBS expansion table that submodule preserves and obtain TBS to described UE.
Wherein, CQI-TBS mapping block 14 comprises interpolation calculation submodule 143, and the CQI adjusted value that is used for calculating according to CQI value computing module 12 is by the TBS of interpolation algorithm calculating to UE2.
Wherein, base station 1 also comprises data to be transmitted amount judge module 15 and TBS estimation block 16, and whether the TBS that data to be transmitted amount judge module 15 is used to judge the 14 current selections of CQI-TBS mapping block suitable wait data quantity transmitted; TBS estimation block 16 is used for when judging that data to be transmitted amount judge module 15 is judged the improper wait data quantity transmitted of the TBS of current selection, again according to waiting for that data quantity transmitted selects TBS.
Wherein, base station 1 also comprises appends distribution module 17, is used for unappropriated available horsepower is appended each UE2 that distributes to access base station 1 service.
Adopt the step pitch of more refinement by above-mentioned HSPA power distribution system, so when the base station assigns through-put power, can quantize the power division waste that remainder brings thereby reduce, suitably heightened the CQI value of selection simultaneously with littler step pitch.Thereby can improve the allocative efficiency that the sub-district available horsepower is distributed, reduce the waste of resource, improve the throughput of sub-district, increase the entire system performance.And thereby this embodiment can also increase the transmission speed of UE by the corresponding TBS of CQI adjusted value adjustment.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (16)
1. a high-speed packet inserts the HSPA power distribution method, it is characterized in that, may further comprise the steps:
Receive the channel condition indication that user equipment (UE) is estimated and reported;
Calculate the difference power of current available maximum power and channel condition indication used channel power when estimating;
According to the described difference power that calculates,,, determine maximum available channel condition indication and corresponding transmission block size TBS in conjunction with the channel condition indication that the UE that receives reports by the channel condition indication map relation of refinement;
For described TBS distributes the required HSPA power of the described TBS of transmission.
2. the method for claim 1 is characterized in that, described channel condition is designated as CQI, and described channel condition indication map relation comprises:
The CQI-SNR mapping relations of described CQI and signal to noise ratio snr and the CQI-TBS mapping relations of described CQI and TBS.
3. method as claimed in claim 2 is characterized in that, the CQI mapping relations of described refinement comprise the refinement CQI-SNR mapping relations and the corresponding refinement CQI-TBS mapping relations of the quantification step pitch that employing is littler;
Then,,,, determine maximum available channel condition indication and corresponding transmission block size TBS, comprising in conjunction with the channel condition indication that the UE that receives reports by the channel condition indication map relation of refinement according to the described difference power that calculates:
According to the described difference power that calculates, search described refinement CQI-SNR mapping relations, in conjunction with the CQI that the UE that receives reports, determine to adjust the maximum available CQI value that obtains;
According to described definite maximum available CQI value, search described refinement CQI-TBS mapping relations, obtain the TBS of described correspondence.
4. method as claimed in claim 3 is characterized in that, the step pitch of described more refinement such as is at a step pitch, or step pitch such as non-.
5. as claim 3 or 4 described methods, it is characterized in that described method also comprises:
Judge whether described definite TBS is fit to the medium data volume waiting for transmission of buffer memory;
Be not suitable for the medium data volume waiting for transmission of buffer memory if judge the TBS that determines, then reselect new TBS according to the medium data volume waiting for transmission of buffer memory.
6. method as claimed in claim 5 is characterized in that, reselects after the new TBS according to the medium data volume waiting for transmission of buffer memory, also comprises:
According to the described new TBS that reselects, the refinement CQI value of the CQI-TBS mapping relationship searching correspondence by refinement;
Obtain corresponding SNR according to described refinement CQI value;
Calculate the difference of the SNR of the CQI correspondence that this SNR and UE report;
On the basis of the through-put power of when CQI estimates, using, add the difference of the above SNR, needing to obtain the power of distribution.
7. as each described method of claim 1 to 4, it is characterized in that, also comprise:, then unappropriated available horsepower is appended and distribute to each UE if still have unappropriated available horsepower.
8. method as claimed in claim 2 is characterized in that, the CQI mapping relations of described refinement are for passing through determined CQI-SNR mapping relations of interpolation calculation and corresponding C QI-TBS mapping relations;
Then,,,, determine maximum available channel condition indication and corresponding transmission block size TBS, comprising in conjunction with the channel condition indication that the UE that receives reports by the channel condition indication map relation of refinement according to the described difference power that calculates:
According to the described difference power that calculates, the CQI in conjunction with the UE that receives reports by interpolation calculation, determines pairing CQI value and corresponding TBS value between two adjacent S NR.
9. method as claimed in claim 8 is characterized in that, described method also comprises:
Judge whether described definite TBS is fit to the medium data volume waiting for transmission of buffer memory;
Be not suitable for the medium data volume waiting for transmission of buffer memory if judge the TBS that determines, then reselect new TBS according to the medium data volume waiting for transmission of buffer memory.
10. method as claimed in claim 9 is characterized in that, reselects after the new TBS according to the medium data volume waiting for transmission of buffer memory, also comprises:
According to the described new TBS that reselects, by the SNR of interpolation calculation correspondence;
Calculate the difference of the SNR of the CQI correspondence that this SNR and UE report;
On the basis of the through-put power of when CQI estimates, using, add the difference of the above SNR, needing to obtain the power of distribution.
11. a base station of distributing HSPA power is characterized in that, comprising:
Receiving element is used to receive the channel condition indication that UE estimates and reports;
Computing unit, the difference power of used channel power when being used to calculate current available maximum power and channel condition indication and estimating;
Determining unit, be used for the difference power that calculates according to described computing unit, by the channel condition indication map relation of refinement,, determine maximum available channel condition indication and corresponding transmission block size TBS in conjunction with the channel condition indication that the received UE of described receiving element reports;
Allocation units are used to the determined TBS of described determining unit to distribute the required HSPA power of the described TBS of transmission.
12. base station as claimed in claim 11 is characterized in that, described channel condition is designated as CQI, and the CQI mapping relations of described refinement comprise the refinement CQI-SNR mapping relations and the corresponding refinement CQI-TBS mapping relations of the quantification step pitch that employing is littler;
Described determining unit comprises:
First subelement is used for the difference power that calculates according to described computing unit, searches described refinement CQI-SNR mapping relations, in conjunction with the CQI that the described UE that receives reports, determines to adjust the maximum available CQI that obtains;
Second subelement is used for the maximum available CQI definite according to described first subelement, searches described refinement CQI-TBS mapping relations, obtains the TBS of described correspondence.
13. base station as claimed in claim 11 is characterized in that, described base station also comprises:
Append allocation units, be used for:, then unappropriated available horsepower is appended and distribute to each UE if still have unappropriated available horsepower.
14. base station as claimed in claim 11 is characterized in that, described channel condition is designated as CQI, and the CQI mapping relations of described refinement are for passing through determined CQI-SNR mapping relations of interpolation calculation and corresponding C QI-TBS mapping relations;
Described determining unit comprises:
The 3rd subelement is used for the difference power that calculates according to described, and the CQI in conjunction with the UE that receives reports by interpolation calculation, determines pairing CQI value and corresponding TBS value between two adjacent S NR.
15., it is characterized in that described base station also comprises as each described base station of claim 11 to 14:
Judging unit is used to judge whether the determined TBS of described determining unit is fit to the medium data volume waiting for transmission of buffer memory, and judged result is sent to described determining unit;
Described determining unit also is used for: receive the judged result that described judging unit sends, if the judged result of the described judging unit that described determining unit receives is that then described determining unit also is not used for reselecting new TBS according to the medium data volume waiting for transmission of buffer memory.
16. a HSPA power distribution system is characterized in that described system comprises user equipment (UE), and as each described base station of claim 11 to 15, wherein, described UE is used for the channel condition of estimating and report is indicated to described base station.
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| CN102186230B (en) * | 2011-05-12 | 2013-10-02 | 上海华为技术有限公司 | Method and device for processing channel quality |
| CN103634888B (en) * | 2012-08-28 | 2017-07-28 | 普天信息技术研究院有限公司 | User's equipment downward transmitting power division method and device in a kind of MU mimo systems |
| US10142945B2 (en) * | 2014-06-05 | 2018-11-27 | Samsung Electronics Co., Ltd. | Power control for transmission of uplink control information on two cells in carrier aggregation |
| CN104135722B (en) * | 2014-08-22 | 2017-08-08 | 电子科技大学 | A kind of method of base stations and multiuser broadcast transmission data |
| CN109392100B (en) * | 2017-08-04 | 2021-09-10 | 大唐移动通信设备有限公司 | Method, device and equipment for determining size of transmission block |
| PT3577874T (en) | 2017-11-17 | 2021-07-12 | Zte Corp | Methods, apparatus and systems for determining a transport block size in a wireless communication |
| CN109495958B (en) * | 2018-10-29 | 2021-09-28 | 常熟理工学院 | Transmission power control method using buffer feedback in energy capture communication system |
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