CN101437284B - Method, apparatus and system for determining emission power of physical down link sharing channel - Google Patents
Method, apparatus and system for determining emission power of physical down link sharing channel Download PDFInfo
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- CN101437284B CN101437284B CN2008102409629A CN200810240962A CN101437284B CN 101437284 B CN101437284 B CN 101437284B CN 2008102409629 A CN2008102409629 A CN 2008102409629A CN 200810240962 A CN200810240962 A CN 200810240962A CN 101437284 B CN101437284 B CN 101437284B
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Abstract
The embodiment of the invention relates to a method, a device and a system for determining the transmission power of a physical downlink shared channel. The method comprises: determining a target CQI value according to the information on the service rate of user equipment UE; calculating power offset value of PDSCH according to the target CQI value and initial channel conditions; and determining the transmission power of the PDSCH according to the power of a reference signal RS and the power offset value obtained through calculation. In the embodiment of the invention, the power offset of the PDSCH is calculated according to the target CQI value and the initial channel conditions, and the transmission power of the PDSCH is determined according to the power offset value obtained through calculation and the power of the reference signal RS, so the transmission power of the PDSCH can be calculated more accurately to meet requirements of the user equipment on data transmission rate and improve the throughput of a mobile communication system.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly a kind of method of definite emission power of physical down link sharing channel, Apparatus and system.
Background technology
Development along with wireless access technology, current mobile communication system can not satisfy the demand of new business, simultaneously in order to fill up huge technological disparity between 3G and the 4G mobile communication system, 3G (Third Generation) Moblie partner (3GPP) tissue has started Long Term Evolution (Long Term Evolution, LTE) standardization effort of technology.On the frequency band of existing 3G mobile communication system, adopt a series of new technology to improve the spectrum efficiency and the traffic rate of system.LTE supports band configurations flexibly, and maximum system bandwidth is 20MHz, and peak transfer rate is descending 100Mbps, up 50Mbps, has guaranteed the demand of different new business.
An important technology in the LTE technology is power control, and it is divided into uplink power control and descending power control.Wherein the main purpose of descending power control is the validity that guarantees downlink transmission.Take different power control strategies at different physical down link channels, can guarantee the Data Receiving quality of each down physical channel, and improve the utilance of gross power.
Physical down link sharing channel (Physical Downlink Shared Channel, the purpose of descending power control PDSCH) is in order to determine and adjust the transmitting power of PDSCH, thereby can be used for improving the message transmission rate of the Cell Edge User of mobile communication system, maximize the throughput of mobile communication system, reduce the power consumption of e-Node B simultaneously.
The transmitting power of this PDSCH is to be determined by the power of distributing to each subscriber equipment, the power of each subscriber equipment is again by each Resource Block (the Resource Block that distributes to it, RB) power on is determined, and a plurality of Resource Units that the power on each RB can be comprised by this RB (Resource Element, the gross energy in unit interval RE) calculates.As long as therefore obtain not comprising among the PDSCH reference signal (Reference Signal, RS) OFDM (Orthogonal Frequency Division Multiplexing, OFDM) every Resource Unit energy of symbol (Energy Per Resource Element, EPRE), contracted notation can be expressed as E
A, just can obtain the transmitting power of PDSCH.The EPRE of RS can be expressed as E
RS, power bias P
ABe expressed as E
AWith E
RSRatio, E then
A=P
AE
RSAs from the foregoing, because in the bandwidth range of down link, the power of the RS in subframe is constant, as long as therefore determined P
A, just can determine E
A, also just can determine the transmitting power of PDSCH.
The inventor finds in realizing process of the present invention, determines that the key of the transmitting power of PDSCH is better to determine P
AValue, and also do not have ripe definite P in the prior art
AThe scheme of value.
Summary of the invention
The embodiment of the invention provides a kind of method, Apparatus and system of definite emission power of physical down link sharing channel, to calculate the transmitting power of PDSCH more exactly, determines the transmitting power of PDSCH.
According to an aspect of the present invention, provide a kind of method of definite physical down link sharing channel PDSCH transmitting power, having comprised:
Service rate information according to user equipment (UE) is determined the channel quality indicator (CQI) desired value;
According to described CQI desired value and initial channel conditions, calculate the power bias value of PDSCH;
According to the power of reference signal RS and the described power bias value that calculates, determine the transmitting power of PDSCH;
Described service rate information according to UE determines that the CQI desired value comprises:
Service rate information calculations average transmission block size TBS desired value according to described UE;
According to the described average T BS desired value that calculates, from the TBS form, obtain the TBS index that satisfies described average T BS desired value;
According to the described TBS index that obtains, mapping obtains the CQI desired value;
Described according to described CQI desired value and initial channel conditions, the power bias value that calculates PDSCH comprises:
Power bias value=KCQI of described PDSCH
Target-SINR
RS-kCO, wherein,
CQI
TargetRepresent described CQI desired value, SINR
RSThe initialize signal interference-to-noise ratio of expression RS, k represents the SINR of CQI and PDSCH signal
PDSCHBetween linear factor,
B is a constant.
According to a further aspect in the invention, provide a kind of device of definite physical down link sharing channel PDSCH transmitting power, having comprised:
The desired value determination module is used for determining the channel quality indicator (CQI) desired value according to the service rate information of user equipment (UE);
The power bias computing module is used for calculating the power bias value of PDSCH according to initial channel conditions and the definite described CQI desired value of described desired value determination module;
The transmitting power determination module is used for the described power bias value that power and described power bias computing module according to reference signal RS calculate, and determines the transmitting power of PDSCH;
Described desired value determination module comprises:
First computing unit is used for the service rate information calculations average transmission block size TBS desired value according to described UE;
Acquiring unit is used for the described average T BS desired value that calculates according to described first computing unit, obtains the TBS index that satisfies described average T BS desired value from the TBS form;
Map unit is used for the described TBS index that obtains according to described acquiring unit, and mapping obtains the CQI desired value;
Power bias value=kCQI of described PDSCH
Target-SINR
RS-kCO, wherein,
CQI
TargetRepresent described CQI desired value, SINR
RSThe initialize signal interference-to-noise ratio of expression RS, k represents the SINR of CQI and PDSCH signal
PDSCHBetween linear factor,
B is a constant.
According to a further aspect in the invention, provide a kind of system of definite physical down link sharing channel PDSCH transmitting power, having comprised: the device of definite PDSCH transmitting power as previously described, and the subscriber equipment of communicating by letter with described device.
By above technical scheme as can be known, the embodiment of the invention is method, the Apparatus and system of earnest reason downlink sharied signal channel PDSCH transmitting power really, calculate the power bias value of PDSCH by CQI desired value and initial channel conditions, and according to the power of reference signal RS and the power bias value that calculates, determine the transmitting power of PDSCH, thereby can realize calculating more accurately the transmitting power of PDSCH, to satisfy the demand of subscriber equipment, improve the throughput of mobile communication system to message transmission rate.
Description of drawings
Fig. 1 determines the schematic flow sheet of method first embodiment of PDSCH transmitting power for the present invention;
Fig. 2 determines the schematic flow sheet of method second embodiment of PDSCH transmitting power for the present invention;
Fig. 3 determines the schematic flow sheet of method the 3rd embodiment of PDSCH transmitting power for the present invention;
Fig. 4 determines the structural representation of device first embodiment of PDSCH transmitting power for the present invention;
Fig. 5 determines the structural representation of device second embodiment of PDSCH transmitting power for the present invention;
Fig. 6 determines the structural representation of the system embodiment of PDSCH transmitting power for the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 1 determines the schematic flow sheet of method first embodiment of PDSCH transmitting power for the present invention.As shown in Figure 1, comprise the steps:
In the mobile communication system of the embodiment of the invention, evolved Node B (e-Node B) transmits down physical channel and distributes power to UE by down link, wherein down physical channel includes PDSCH, and main reference UE was to the service rate information and the CQI information of its transmission when e-Node B carried out power division.Here, every Resource Unit energy (EPRE) of PDSCH is used E
AExpression, the EPRE E of RS
RSExpression, E
AWith E
RSBetween power bias symbol P
AExpression is for convenience of calculation, herein to E
AAnd E
RSCarry out number conversion, after the conversion, can adopt E
AWith E
RSBetween difference represent power bias P
AWherein, power bias P
ASpan be 3,2,1,0 ,-1 ,-2 ,-3 ,-6}, P
ABe defined as:
P
A＝E
A-E
RS (1)
Power bias value=SINR
PDSCH-SINR
RS(2)
Wherein, SINR
PDSCHThe Signal Interference and Noise Ratio of expression PDSCH, SINR
RSThe Signal Interference and Noise Ratio of expression RS.(1) the power bias P in the formula
AObtain after can rounding processing by the power bias value that (2) formula calculates, thereby according to E
RSAnd P
ACalculate E
A
I
MCSExpression modulation coding mode (Modulation and Coding Scheme is hereinafter to be referred as MCS) index, wherein MCS can include 28 kinds of coded systems, and 28 kinds of coded system corresponding codes speed are hanged down and are composed of sequence number 1～28 respectively to height.At SINR
PDSCHAnd I
MCSBetween following relation arranged:
SINR
PDSCH＝k·I
MCS+b (3)
Wherein, k represents the SINR of CQI (wherein CQI is corresponding with MCS) and PDSCH signal
PDSCHBetween linear factor, the physical significance of this value represents that the sequence number as MCS differs when being 1, the power difference of the PDSCH of MCS correspondence, b is a constant, k, b are determined by physical layer emulation.
With (3) formula substitution (2) Shi Kede:
Power bias value=kI
MCS-SINR
RS-kCO (4)
Because I
MCSCan equivalent representation be CQI desired value CQI
Target, then (4) formula can be write as:
Power bias value=kCQI
Target-SINR
RS-kCO (5)
Wherein,
CQI
TargetThe value of the CQI of expression PDSCH target expectation.
For the CQI value of reporting CQI
Report, definition NMPO is the power bias information between the EPRE of the EPRE of PDSCH and RS, then
SINR
PDSCH＝SINR
RS+NMPO (6)
With (6) formula substitution (3) Shi Kede:
SINR
RS＝k·CQI
report-NMPO-k·CO (7)
In step 101 and step 102, by (5) formula as can be known, as long as calculate CQI desired value CQI
Target, and determined channel condition, promptly can calculate the power bias value of PDSCH.This channel condition can be initial channel conditions, for example comprises the Signal Interference and Noise Ratio SINR of RS
RSOr signal noise ratio etc.In step 103, obtain power bias P after the power bias value that calculates rounded processing
A, with P
AIn substitution (1) formula, can determine E
A, and then finally obtain the transmitting power of PDSCH.
The method of definite PDSCH transmitting power that present embodiment provides, calculate the power bias value of PDSCH by CQI desired value and initial channel conditions, and according to the power of reference signal RS and the power bias value that calculates, determine the transmitting power of PDSCH, thereby can realize calculating more accurately the transmitting power of PDSCH, to satisfy the demand of subscriber equipment, improve the throughput of mobile communication system to message transmission rate.
Fig. 2 determines the schematic flow sheet of method second embodiment of PDSCH transmitting power for the present invention.In the present embodiment, (Long Term Evolution, LTE) system is an example, is presented in e-Node B first when UE transmits PDSCH or when the business of transmitting between UE and the e-Node B changes, and determines power bias P with Long Term Evolution
AProcess, this sentences e-Node B, and to transmit PDSCH to UE first be example, by calculating the initial power bias, and then obtains power bias P
AAs shown in Figure 2, comprise the steps:
E-Node B is first when UE transmits PDSCH, the service rate that UE sends comprises a plurality of assurance bit rates (Guarantee Bit Rate, hereinafter to be referred as GBR) value of professional GBR and gathering maximum bit rate (Aggregated Maximum Bit Rate, value AMBR) of non-GBR business.At first calculate the targeted rate R of UE
TargetFor:
R
Target＝K
overhead·(GBR
1+GBR
2+Λ+GBR
n+AMBR)(n≤8) (8)
Wherein, K
OverheadBe illustrated in P
AThe asking in the process of value to targeted rate R
TargetCalculating use when obtaining, corresponding to the weighted factor of removing the actual data rate after the expense of GBR and AMBR.
Corresponding average transmission block size desired value TB
TargetFor:
TB
Target＝0.001·R
Target (9)
The average T BS desired value that step 202, basis calculate is obtained the TBS index that satisfies average T BS desired value from the TBS form.
Wherein, satisfy TB if from the TBS form, obtain
TargetThe TBS index have a plurality ofly, (Resource Block, the RB) mode of choosing of utilance balance from a plurality of TBS index that obtain, filter out a TBS index then to use power utilization and Resource Block.In addition, there are corresponding relation in this TBS index and RB number, i.e. (TBS
Index, RB).
The concrete computational process of step 202 is:
At first, from the TBS form, obtain and to satisfy TB according to 3GPP TS 36.213 agreements
TargetThe TBS index and corresponding RB number (TBS
Index, RB), wherein the TBS form is 26 row * 110 row, the corresponding TBS index of 26 row wherein, 110 row are corresponding RB number respectively, and columns just represents the number of RB, as the 8th row corresponding is exactly 8 RB.Find out each TBS index pairing suitable R B number of being expert at, i.e. Dui Ying row, the TBS index of selecting by this mode has a plurality of, in order to choose only TBS index and its corresponding RB number, can take power utilization η
Power_Line[i] and RB utilance η
RBThe mode of choosing of [i] relative equilibrium, the purpose of doing like this are that RB also has residue or RB to exhaust and the power of e-Node B also has remaining situation to take place for the power drain that prevents e-Node B, thus the utilance of the power of maximization e-Node B.It is as follows that it specifically chooses mode:
For (i=0; I＜26; I++)/and * i represents row, corresponding TBS index, and row circulation */
The capable * of the corresponding i of/*/
if i≤9 then
{η
Power_dB[i]＝10log
10(12*RB(i))-10log
10((66.67)·10
-6)
+(k·i-SINR
RS-k·CO+P
RS)-P
max；}
The RB number * of the TBS index correspondence that the i that/* RB (i) expression is obtained is capable/
elseif i≤15 then
{η
Power_dB[i]＝10log
10(12*RB(i))-10log
10((66.67)·10
-6)
+(k·(i+1)-SINR
RS-k·CO+P
RS)-P
max；}
else
{η
Power_dB[i]＝10log
10(12*RB(i))-10log
10((66.67)·10
-6)
+(k·(i+2)-SINR
RS-k·CO+P
RS)-P
max；}
(10)/* power utilization linear value
*/
Δ[i]＝|η
Power_Line[i]-η
RB[i]|； (12)
Deviation * between/* power utilization and the RB utilance/
}
Wherein, P
MaxBe the maximum transmission power of e-Node B, M
DLDownstream transmission bandwidth for e-Node B to UE.Obtain minimum corresponding TBS index and the RB number of i value of deviation delta [i] between above-mentioned power utilization and the RB utilance then, wherein TBS index symbol TBS
Target_IndexExpression, that is:
TBS
Target_Index＝f(min{Δ[1]，Δ[2]，Λ，Δ[26]}) (13)
Wherein, function f represents to obtain the i value of Δ [i].
The TBS index that step 203, basis are obtained, mapping obtains CQI desired value CQI
Target
Be understandable that, though in the description of step 202, related to choosing of RB number, because there are corresponding relation in TBS index and RB number, so, with regard to CQI desired value CQI in the step 203
TargetChoose, just can realize by the TBS index.
The TBS index TBS concrete, that step 202 is chosen
Target_IndexBe mapped to CQI
TargetValue, be specially:
if TBS
Target_Index≤9 then CQI
Target＝TBS
Target_Index；
elseif TBS
Target_Index≤15 then CQI
Target＝TBS
Target_Index+1；
else CQI
Target＝TBS
Target_Index+2。
Initial channel conditions can be initial (or claiming first) Signal Interference and Noise Ratio SINR of RS herein
RS, the power bias value of PDSCH is initial power bias P
O_PDSCH(0); Calculate P according to following formula
O_PDSCH(0):
P
o_PDSCH(0)＝k·CQI
Target-SINR
RS-k·CO (14)
To initial power bias P
O_PDSCH(0) to power bias P
AMapping, based on following mapping criterion:
(a) P
O_PDSCHGreater than 0, think that UE is apart from e-Node B (SINR wherein far away
RSLess), then to P
O_PDSCHRound downwards and obtain P
A, the promptly corresponding P that reduces
AValue;
(b) P
O_PDSCHLess than 0, think that UE is apart from the nearer (SINR wherein of e-Node B
RSBigger), then to P
O_PDSCHRound up and obtain P
A, promptly corresponding increase P
AValue;
(c) at above-mentioned P
O_PDSCHIn the mapping,, increase transmitting power,, reduce transmitting power (being the water filling theorem) UE away from e-Node B to UE near e-Node B.
As follows based on the mapping process that above-mentioned mapping criterion is carried out:
If P
O_PDSCH(0)＞0 then/* P
ABe provided with round downwards */
{ if P
o_PDSCH(0)≥2 then P
A(0)＝3；
Else
/ * is to P
ARound downwards */
}
Else P
O_PDSCH(0)≤0/* P
ASetting round up */
{ if P
o_PDSCH(0)≤-4 then P
A(0)＝-6；
elseif P
o_PDSCH(0)＜-2 then P
A(0)＝-3；
Else P
A(0)=| P
O_PDSCH(0) |; / * is to P
ARound up */
}
Above-mentioned steps 205 and step 206 have been determined the power bias P of PDSCH
AAfter, again with the power bias P that calculates
AIn substitution (1) formula, obtain E
A, can determine the Initial Trans of PDSCH, or the transmitting power of the PDSCH of the business of transmitting between UE and the e-Node B when changing.
Present embodiment has mainly been introduced at e-Node B first when UE transmits PDSCH or when the business of transmitting between UE and the e-Node B changes, according to service rate information calculations targeted rate, and then calculate average transmission block size desired value, determine the CQI desired value, the rated output bias, at last power bias value is rounded the process of determining power bias of handling, thereby can more reasonably determine the value of e-Node B to the transmitting power of PDSCH distribution, can satisfy the demand of the service data transmission rate of UE, improve the throughput of mobile communication system.
For the variation of the transmitting power that makes PDSCH compensate for channel decline adaptively, to the P that calculates in the foregoing description
ACan also carry out the self adaptation adjustment, promptly upgrade.To power bias P
ARenewal promptly to the renewal of power bias value, take method of adjustment based on the CQI value of reporting, but in adjustment, can all adjust power bias value one time to each CQI value of reporting, but, just power bias value is upgraded when the difference of this CQI value of reporting that reports and CQI reference value during greater than a default thresholding.
Further, can be with preceding CQI value of reporting when once trigger upgrading power bias value, as the value of CQI reference value next time.Certainly, a value also can be set, as the CQI reference value.
Wherein the variation of the CQI value of reporting that reports according to the UE step of adjusting power bias value can be carried out after the initial power bias is determined.This step can be according to the CQI value of reporting CQI
Report(7) formula of utilization is calculated the Signal Interference and Noise Ratio SINR of RS
RS, and then (7) formula substitution (5) formula can be obtained according to CQI
ReportThe power bias value of the PDSCH that adjusts.
Fig. 3 determines the schematic flow sheet of method the 3rd embodiment of PDSCH transmitting power for the present invention.The power bias value that how to describe in detail PDSCH upgrades.As shown in Figure 3, comprise the steps:
The current demand signal interference-to-noise ratio SINR of step 304, use RS
RSUpgrade CQI desired value CQI
Target
Wherein, if with preceding CQI value of reporting when once trigger upgrading power bias value, as the value of CQI reference value next time, then judge that in step 302 difference between this CQI value of reporting and the CQI reference value when presetting thresholding, can also upgrade CQI reference value CQI
Filter_ref, make it equal the CQI value of reporting CQI that this UE reports
Filter
Concrete, in step 302～step 304, according to the CQI information that UE reports, e-NodeB can adopt the CQI adjustment algorithm to calculate this CQI value of reporting CQI
FilterAnd judge whether relatively that according to following formula needs recomputate SINR
RS, CQI wherein
Filter_refBe CQI reference value, CQI
ThBe default thresholding.
if |CQI
filter(i)-CQI
filter_ref|＞CQI
Th then
/ * carries out following calculating SINR greater than the CQI threshold value
RSStep */
{ SINR
RS(i)＝k·CQI
filter(i)-NMPO-k·CO (15)
CQI
filter_ref＝CQI
filter(i)； (16)
Use SINR
RS(i) recomputate and obtain CQI desired value CQI
Target,, just calculate η in the step 202 with step 202～step 203
Power_dBThe SINR that uses in [i]
RS(i) change to the SINR that obtained by (15) formula this moment
RS(i);
}
Else/* does not surpass threshold value, CQI
TargetConstant, CQI
Filter_refConstant */
CQI
Target(i)＝CQI
Target(i-1)； (17)
Wherein, CQI
Filter_refCan be along with each CQI
TargetThe renewal of value and being replaced, its initial value is
Wherein, SINR
RS_InitialInitialize signal interference-to-noise ratio for RS.
In step 305,, upgraded CQI when whether the difference of the CQI value of reporting and CQI reference value surpasses the CQI threshold value
TargetThe time, will be according to current CQI
TargetValue rated output bias P
O_PDSCH(n), that is,
P
o_PDSCH(n)＝k·CQI
Target-k·CQI
filter(n)+NMPO (18)
(18) formula of being somebody's turn to do is according to (7) formula substitution (5) formula is got.Refer step 205 and step 206 are with power bias value P then
O_PDSCH(n) be mapped to power bias P according to above-mentioned mapping criterion
AThereby, realize power bias P
AAdjustment and renewal.
Present embodiment has mainly been introduced the variation for the transmitting power compensate for channel decline adaptively that makes PDSCH, and the power bias P that carries out
AAdjustment and update method, thereby realize the adjustment of the transmitting power of the PDSCH that distributes is realized the control to the descending power of PDSCH, to satisfy the demand of UE, improve the throughput of mobile communication system to message transmission rate.
Fig. 4 determines the structural representation of device first embodiment of PDSCH transmitting power for the present invention.As shown in Figure 4, this device 4 of determining the PDSCH transmitting power comprises: desired value determination module 41, power bias computing module 42 and transmitting power determination module 43.Desired value determination module 41 is used for determining channel quality indication (CQI) desired value according to the service rate information of subscriber equipment (UE); Power bias computing module 42 is used for the CQI desired value determined according to initial channel conditions and desired value determination module 41, calculates the power bias value of PDSCH; Transmitting power determination module 43 is used for the power bias value that calculates according to the power of reference signal (RS) and power bias computing module 42, determines the transmitting power of PDSCH.
The device of definite PDSCH transmitting power that present embodiment provides provides the module of the transmitting power of rated output bias and definite PDSCH, and its detailed process of determining the PDSCH transmitting power can realize by the description of the concrete grammar step among the method embodiment of above-mentioned definite PDSCH transmitting power.
The device of definite PDSCH transmitting power that present embodiment provides, can the rated output bias by the CQI desired value, thus can determine the transmitting power of PDSCH, determine the PDSCH transmitting power, to satisfy the demand of subscriber equipment, improve the throughput of mobile communication system to message transmission rate.
Fig. 5 determines the structural representation of device second embodiment of PDSCH transmitting power for the present invention.As shown in Figure 5, this determines that the device 5 of PDSCH transmitting power comprises desired value determination module 51, power bias computing module 52 and transmitting power determination module 53.
Wherein, desired value determination module 51 can comprise: first computing unit 511 is used for service rate information calculations average transmission block size (TBS) desired value according to UE; Acquiring unit 512 is used for the average T BS desired value that calculates according to first computing unit 511, obtains the TBS index that satisfies average T BS desired value from the TBS form; Map unit 513 is used for the TBS index that obtains according to acquiring unit 512, and mapping obtains the CQI desired value.Wherein acquiring unit 512 can also comprise screening subelement 5121, be used for having a plurality of if obtain the TBS index that satisfies average T BS desired value from the TBS form, then use the mode of choosing of power utilization and Resource Block (RB) utilance balance, from a plurality of TBS index that obtain, filter out a TBS index.
Transmitting power determination module 53 can comprise: round unit 531 and be used for the power bias value that power bias computing module 52 calculates is rounded processing, obtain the power bias of PDSCH; Second computing unit 532 is used for determining the transmitting power of PDSCH according to the power of RS with by rounding the power bias after unit 531 rounds.
The device 5 that should determine the PDSCH transmitting power can also comprise first update module 54 be used for when the difference of this CQI value of reporting and CQI reference value when presetting thresholding, power bias value is upgraded.Wherein first update module 54 can comprise: the 3rd computing unit 541 is used for calculating the current demand signal interference-to-noise ratio of RS according to this CQI value of reporting; The 3rd upgrades unit 542 is used to use the current demand signal interference-to-noise ratio of the RS that the 3rd computing unit 541 calculates to upgrade the CQI desired value; Heavy determining unit 543 is used for the current demand signal interference-to-noise ratio according to the RS that calculates by CQI desired value after 542 renewals of the 3rd renewal unit and the 3rd computing unit 541, redefines power bias value.
Should determine that the device 5 of PDSCH transmitting power can also comprise that second update module 55 is used to upgrade the CQI reference value, and make it equal this CQI value of reporting.
The device of definite PDSCH transmitting power that present embodiment provides provides to be determined and adjusts concrete computing module in the module of power bias, determine and the adjustment power bias by each module, thereby the detailed process of determining the transmitting power of PDSCH can realize by the description of the concrete grammar step among the method embodiment of above-mentioned definite PDSCH transmitting power.
Present embodiment has mainly been introduced the transmitting power for definite PDSCH, and makes the variation of its compensate for channel decline adaptively, and the power bias P that carries out
ADetermine and method of adjustment, thereby realize the determining and adjust of the transmitting power of the PDSCH that distributes realized the control to the descending power of PDSCH, to satisfy the demand of UE, improve the throughput of mobile communication system to message transmission rate.
Fig. 6 determines the structural representation of the system embodiment of PDSCH transmitting power for the present invention.As shown in Figure 6, this system comprises: the device 6 of definite PDSCH transmitting power described above, and the subscriber equipment 7 of communicating by letter with the device 6 of definite PDSCH transmitting power.Wherein, subscriber equipment 7 can send the device 6 of business information and the extremely definite PDSCH transmitting power of the CQI value of reporting.Should determine that the device 6 of PDSCH transmitting power can be integrated on the e-Node B equipment, or be integrated on other network element devices.
The system of definite PDSCH transmitting power that present embodiment provides can determine and adjust power bias, thereby determine the transmitting power of PDSCH, its detailed process can realize by the description of the concrete grammar step among the above-mentioned physical down link sharing channel method for controlling downlink power embodiment.
The system of definite PDSCH transmitting power that present embodiment provides, determine power bias by the CQI desired value, and can further adjust power bias by CQI value of reporting that subscriber equipment sends, thereby can determine and adjust the transmitting power of PDSCH, realize the control of the descending power of PDSCH, to satisfy the demand of subscriber equipment, improve the throughput of mobile communication system to message transmission rate.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in a computer and can obtain in the storage medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (15)
1. the method for a definite physical down link sharing channel PDSCH transmitting power is characterized in that, comprising:
Service rate information according to user equipment (UE) is determined the channel quality indicator (CQI) desired value;
According to described CQI desired value and initial channel conditions, calculate the power bias value of PDSCH;
According to the power of reference signal RS and the described power bias value that calculates, determine the transmitting power of PDSCH;
Described service rate information according to UE determines that the CQI desired value comprises:
Service rate information calculations average transmission block size TBS desired value according to described UE;
According to the described average T BS desired value that calculates, from the TBS form, obtain the TBS index that satisfies described average T BS desired value;
According to the described TBS index that obtains, mapping obtains the CQI desired value;
Described according to described CQI desired value and initial channel conditions, the power bias value that calculates PDSCH comprises:
Power bias value=kCQI of described PDSCH
Target-SINR
RS-kCO, wherein,
CQI
TargetRepresent described CQI desired value, SINR
RSThe initialize signal interference-to-noise ratio of expression RS, k represents the SINR of CQI and PDSCH signal
PDSCHBetween linear factor,
B is a constant.
2. method according to claim 1 is characterized in that, has a plurality ofly if obtain the TBS index that satisfies described average T BS desired value from the TBS form, and then described method also comprises:
Use the mode of choosing of power utilization and Resource Block RB utilance balance, from a plurality of TBS index that obtain, filter out a TBS index.
3. method according to claim 1 is characterized in that, described initial channel conditions is the initialize signal interference-to-noise ratio of RS.
4. method according to claim 1 is characterized in that, and is described according to the power of reference signal RS and the described power bias value that calculates, and determines that the transmitting power of PDSCH comprises:
The described power bias value that calculates is rounded processing, obtain the power bias of PDSCH;
According to the power of RS with the described power bias after rounding, determine the transmitting power of PDSCH.
5. according to each described method of claim 1 to 4, it is characterized in that described method also comprises:
When the difference of this CQI value of reporting and CQI reference value during, described power bias value is upgraded greater than default thresholding.
6. method according to claim 5 is characterized in that, also comprises: upgrade described CQI reference value, make it equal described this CQI value of reporting.
7. method according to claim 6 is characterized in that, described described power bias value is upgraded comprises:
According to described this CQI value of reporting, calculate the current demand signal interference-to-noise ratio of described RS;
Use the current demand signal interference-to-noise ratio of described RS to upgrade described CQI desired value;
According to described CQI desired value after upgrading and the current demand signal interference-to-noise ratio of described RS, redefine described power bias value.
8. according to each described method of claim 1 to 4, it is characterized in that described method is applied to Long Term Evolution LTE system.
9. the device of a definite physical down link sharing channel PDSCH transmitting power is characterized in that, comprising:
The desired value determination module is used for determining the channel quality indicator (CQI) desired value according to the service rate information of user equipment (UE);
The power bias computing module is used for calculating the power bias value of PDSCH according to initial channel conditions and the definite described CQI desired value of described desired value determination module;
The transmitting power determination module is used for the described power bias value that power and described power bias computing module according to reference signal RS calculate, and determines the transmitting power of PDSCH;
Described desired value determination module comprises:
First computing unit is used for the service rate information calculations average transmission block size TBS desired value according to described UE;
Acquiring unit is used for the described average T BS desired value that calculates according to described first computing unit, obtains the TBS index that satisfies described average T BS desired value from the TBS form;
Map unit is used for the described TBS index that obtains according to described acquiring unit, and mapping obtains the CQI desired value;
Power bias value=kCQI of described PDSCH
Target-SINR
RS-kCO, wherein,
CQI
TargetRepresent described CQI desired value, SINR
RSThe initialize signal interference-to-noise ratio of expression RS, k represents the SINR of CQI and PDSCH signal
PDSCHBetween linear factor,
B is a constant.
10. device according to claim 9 is characterized in that, described acquiring unit also comprises:
The screening subelement is used for then using the mode of choosing of power utilization and Resource Block RB utilance balance if obtaining the TBS index that satisfies described average T BS desired value from the TBS form has a plurality ofly, from a plurality of TBS index that obtain, filters out a TBS index.
11. device according to claim 9 is characterized in that, described transmitting power determination module comprises:
Round the unit, be used for the described power bias value that described power bias computing module calculates is rounded processing, obtain the power bias of PDSCH;
Second computing unit is used for determining the transmitting power of PDSCH according to the power of described RS with by the described described power bias that rounds after the unit rounds.
12. according to each described device of claim 9 to 11, it is characterized in that, also comprise:
First update module is used for when the difference of this CQI value of reporting and CQI reference value during greater than default thresholding described power bias value being upgraded.
13. device according to claim 12 is characterized in that, also comprises:
Second update module is used to upgrade described CQI reference value, makes it equal described this CQI value of reporting.
14. device according to claim 12 is characterized in that, described first update module comprises:
The 3rd computing unit is used for calculating the current demand signal interference-to-noise ratio of described RS according to described this CQI value of reporting;
The 3rd upgrades the unit, is used to use the current demand signal interference-to-noise ratio of the described RS that described the 3rd computing unit calculates to upgrade described CQI desired value;
Heavy determining unit is used for the current demand signal interference-to-noise ratio according to the described RS that calculates by described CQI desired value after described the 3rd renewal unit renewal and described the 3rd computing unit, redefines described power bias value.
15. the system of a definite physical down link sharing channel PDSCH transmitting power is characterized in that, comprising: as the device of each described definite PDSCH transmitting power of claim 9 to 14, and the subscriber equipment of communicating by letter with described device.
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| CN101720123B (en) * | 2009-12-02 | 2012-10-17 | 华为技术有限公司 | Method, device and base station for setting power offset of channel |
| CN102088759B (en) * | 2009-12-03 | 2015-05-20 | 中兴通讯股份有限公司 | Downlink power control system and method |
| CN102413557B (en) * | 2011-11-25 | 2015-06-17 | 中国电信股份有限公司 | Uplink reference signal transmission method, terminal and multi-antenna communication system |
| JP2013219507A (en) * | 2012-04-06 | 2013-10-24 | Ntt Docomo Inc | Radio communication method, local area base station device, mobile terminal device, and radio communication system |
| CN103582148A (en) * | 2012-08-10 | 2014-02-12 | 中兴通讯股份有限公司 | Method and device for adjusting scheduling strategy and base station |
| CN103686926A (en) * | 2012-09-11 | 2014-03-26 | 普天信息技术研究院有限公司 | Acceptance judgment method for uplink bearer request |
| CN106888477B (en) * | 2017-02-08 | 2019-07-09 | 中国联合网络通信集团有限公司 | A kind of method and apparatus for assessing integrated service bearing capacity |
| CN111491355B (en) * | 2019-01-29 | 2021-10-01 | 大唐移动通信设备有限公司 | Downlink power configuration method and device |
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