CN102404034B - Method for adjusting weight vector of transmit diversity and terminal equipment - Google Patents
Method for adjusting weight vector of transmit diversity and terminal equipment Download PDFInfo
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- CN102404034B CN102404034B CN201110378665.2A CN201110378665A CN102404034B CN 102404034 B CN102404034 B CN 102404034B CN 201110378665 A CN201110378665 A CN 201110378665A CN 102404034 B CN102404034 B CN 102404034B
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- weight vector
- tpc
- code book
- assessment cycle
- book index
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Abstract
The embodiment of the invention provides a method for selecting a weight vector, a method for adjusting the weight vector of transmit diversity and terminal equipment, which relate to the communication field. The accuracy of a value of the updated weight vector can be improved and meanwhile a good receiving signal can be obtained by the receiving end. The method for adjusting the weight vector of the transmit diversity comprises the following steps of: accumulating transmit power control (TPC) command values in an evaluation cycle; selecting the weight vector adjustment quantity corresponding to the TPC accumulated value in the evaluation cycle; and adjusting the weight vector according to the weight vector adjustment quantity. The method provided by the embodiment of the invention is applied to the terminal equipment.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of weight vector method of adjustment and terminal equipment of transmit diversity.
Background technology
In wireless transmitting system, the principal element that affects signal transmission quality is exactly the decline of channel, and adopts transmit diversity techniques can resist to a certain extent channel fading, ensures effective transmission of signal.
The kind of transmit diversity techniques is a lot, and OLTD (open loop transmit diversity, Open-Loop Transmit Diversity) is wherein a kind of.OLTD comprises two kinds of form: AS (Antenna Switch, antenna switches) and BF (Beamforming, beam forming).BF general principle: baseband signal, by its data phase weighting, is placed on respectively two transmit antennas and sends, makes receiver obtain maximum signal to noise ratio, thereby obtains diversity gain.
In 3GPP, BFTD (Beam Forming Transmission Diversity, wave beam the forms transmit diversity) reference scheme in CELL DCH (CELL Dedicated Channel, cell private channel) is:
1, every 6 time slots (4ms), weight vector of transmitting antenna renewal and the code book index of UE (User Equipment, subscriber equipment).
2, cumulative TPC (transmit power-control, transmitting power control) bid value within an assessment cycle, assessment cycle is that twice weight vector upgrades interval, described assessment cycle duration be 6 time slots.
3, new weight vector by the upper basis of code book index of once upgrading ± 1 obtain new code book index and obtain; If cumulative TPC bid value is for negative, code book index direction remains unchanged, otherwise changes direction.
Wherein, code book index is provided with direction, each TPC order represents with+1 or-1,-1 is down (decline) order, + 1 is up (rising) order, and TPC bid value is pressed the cumulative rear result of time slot and 0 relatively, and result is for negative, mean that the number of down order is greater than the number of up order, code book index direction remains unchanged; Result, for just, means that the number of down order is less than the number of up order, and code book index changes direction.
In the time that UE chooses best weight value vector, it is the strongest that it receives signal, and in prior art scheme, TPC order is pressed the cumulative rear result of time slot and 0 relatively, and this process has been ignored the size of slot time.Taking two assessment cycles as example, the information that the information that 6 time slot TPC values "+1+1+1+1+1+1 " reflect and 6 time slot TPC values " 1+1+1-1+1+1 " reflect is different, but all means that in the prior art identical code book index changes direction.Weight vector is relevant to code book index, and therefore, the weight vector value accuracy of renewal is low, causes receiving end signal of poor quality simultaneously.
Summary of the invention
Embodiments of the invention provide a kind of weight vector method of adjustment and terminal equipment of transmit diversity, can make the weight vector value accuracy of renewal high, make receiving terminal obtain good reception signal simultaneously.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, provide a kind of weight vector method of adjustment of transmit diversity, comprising:
Cumulative transmitting power control TPC bid value within an assessment cycle;
Choose the weight vector adjustment amount corresponding with the size of the TPC accumulated value in described assessment cycle;
Carry out the adjustment of weight vector according to described weight vector adjustment amount.
On the other hand, provide a kind of terminal equipment, comprising:
Cumulative unit, for cumulative transmitting power control TPC bid value within an assessment cycle;
Selected cell, for choosing the weight vector adjustment amount corresponding with the size of the TPC accumulated value in described assessment cycle;
Updating block, for carrying out the adjustment of weight vector according to described weight vector adjustment amount.
Weight vector method of adjustment and the terminal equipment of the weight vector method of adjustment transmit diversity of the transmit diversity that embodiments of the invention provide, be included in cumulative transmitting power control TPC bid value in the assessment cycle; Choose the weight vector adjustment amount corresponding with the size of the TPC accumulated value in described assessment cycle; Carry out the adjustment of weight vector according to described weight vector adjustment amount.Therefore, different transmitting power TPC accumulated value correspondences different weight vector adjustment amounts, instead of look like in prior art only with positive and negative differentiation transmitting power TPC accumulated value result, therefore, the weight vector adjustment amount that transmitting power TPC accumulated value is corresponding is more distinguished to refinement, and then making the weight vector value accuracy of renewal high, received signal quality is good.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The weight vector method of adjustment flow chart of a kind of transmit diversity that Fig. 1 provides for the embodiment of the present invention;
The weight vector method of adjustment flow chart of the another kind of transmit diversity that Fig. 2 provides for the embodiment of the present invention;
The weight vector method of adjustment flow chart of another transmit diversity that Fig. 3 provides for the embodiment of the present invention;
A kind of terminal equipment structural representation that Fig. 4 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment mono-
The weight vector method of adjustment of the transmit diversity that the embodiment of the present invention provides as shown in Figure 1, comprising:
S101, within an assessment cycle cumulative transmitting power control TPC bid value.
S102, choose the weight vector adjustment amount corresponding with the size of the TPC accumulated value in assessment cycle.
S103, carry out the adjustment of weight vector according to weight vector adjustment amount.
Therefore, different TPC accumulated value correspondences different weight vector adjustment amounts, instead of look like in prior art only with positive and negative differentiation TPC accumulated value result, therefore, the weight vector adjustment amount that TPC accumulated value is corresponding is more distinguished to refinement, and then make the weight vector value accuracy of renewal high, make receiving terminal obtain good reception signal simultaneously.
It should be noted that, this assessment cycle is that twice weight vector upgrades interval, and its duration is N time slot, upgrades a weight vector every the transmitting antenna of N time slot UE.
Step S102 specific implementation method is: the TPC accumulated value in assessment cycle obtains by following formula:
wherein, l
1≤ l
2≤ ...≤l
n; TPC
ifor i TPC bid value in assessment cycle, l
iit is the weights coefficient of i slot time; I slot time is the time difference in i TPC bid value feedback moment and assessment cycle in last TPC bid value feedback moment.Because assessment cycle, duration was N time slot, so i slot time is N-i time slot, example, if an assessment cycle is 6 time slots, the 1st slot time is 5 time slots.L
ican represent the weights coefficient of i slot time and TPC accumulated value correlation.L
ican be that slot time is larger, weights coefficient be less, and i slot time and TPC accumulated value correlation are less.Certainly, except the accumulation method of mentioning here, also can carry out the cumulative of TPC bid value according to the method for prior art, do not consider the impact in the time interval, and think that each TPC bid value weight is identical in certain hour, do not need to do weighted accumulation, but direct each TPC value in accumulation period.
Prior art is only cumulative to the TPC bid value of feedback, thereby only considers the TPC bid value of all time slot feedbacks in each assessment cycle, and has ignored the detailed information that each time slot feeds back, and its result only has negative value and two kinds of situations of nonnegative value.The implementation method of taking steps in S102, within an assessment cycle, according to the TPC bid value of feedback and the slot time size of the TPC receiving, TPC is done to weighted accumulation processing, not only consider the TPC bid value of time slot feedback, the slot time size of also having considered TPC, its result has multiple situation.Therefore, make the adjustment of weight vector more accurately, rapidly, thus the energy consumption of having saved UE.
Meanwhile, weight vector adjustment amount comprises code book index adjustment increment and weight vector adjustment amount, and because code book index has relation one to one with weight vector in a code book, both can be considered as equivalence.In step S102, specifically comprise: adjust the increment relation table of comparisons with reference to TPC accumulated value and code book index, choose the code book index corresponding with TPC accumulated value in assessment cycle and adjust increment; The code book index using when code book index is adjusted to increment and front weight vector adjustment is added and obtains new code book index, and the code book index based on new is determined weight vector adjustment amount.
The weight vector method of adjustment of this transmit diversity also comprises the code book index that the front weight vector of storage uses while adjustment.
, in step S102, also can specifically comprise: with reference to TPC accumulated value and weight vector adjustment amount comparison table, choose the weight vector adjustment corresponding with the size of the TPC accumulated value in assessment cycle meanwhile.Can directly do weight vector adjustment based on TPC accumulated value like this.
Example, the weight vector that the embodiment of the present invention provides is chosen concrete grammar can be as shown in Figure 2, S201, cumulative transmitting power TPC bid value within an assessment cycle.
S202, adjust the increment relation table of comparisons according to transmitting power TPC accumulated value and predefined transmitting power TPC accumulated value and code book index, choose code book index and adjust increment.
S203, add that with the last code book index upgrading code book index adjusts increment and obtain new code book index, according to predefined code book index and weight vector comparison table, obtain the weight vector that new code book index is corresponding.
It should be noted that, TPC accumulated value, code book index are adjusted the corresponding relation of increment can be predefined according to the character of UE, and UE, carrying out weight vector while choosing, can obtain new weight vector according to this table of comparisons, and l is being set
itime, need to meet l
1≤ l
2≤ ...≤l
nrelation, therefore l
ivalue have multiple, example, work as l
i=1 o'clock, the corresponding relation of TPC accumulated value and code book index adjustment increment can be as shown in table 1, within an assessment cycle, have+6, + 4, + 2, 0,-2,-4,-6 totally 7 kinds of TPC accumulated value situations, correspondence-3 respectively,-2,-1, 0, 1, 2, 3 code book index is adjusted increment, new weight vector is to obtain new code book index by renewal on the basis at the upper code book index once upgrading to obtain, the TPC accumulated value even obtaining is+2, it is-1 that the code book index of mapping is adjusted increment, the last code book index upgrading is X, X adds that code book index adjustment increment-1 obtains new code book index, again according to predefined code book index and weight vector comparison table, obtain the weight vector that new code book index is corresponding.
Table 1
It should be noted that, in each embodiment of the present invention, can adjust for adjusting weight vector and code book index simultaneously, also can be only adjust for wherein one.
The weight vector that the embodiment of the present invention provides is chosen concrete grammar can be as shown in Figure 3, S301, cumulative transmitting power TPC bid value within an assessment cycle.
S302, according to transmitting power TPC accumulated value and predefined TPC accumulated value and weight vector adjustment amount comparison table, choose weight vector adjustment amount.
S303, on the basis of upper weight vector once, rotate the angle of weight vector adjustment amount, obtain new weight vector.
It should be noted that, the corresponding relation of TPC accumulated value, weight vector adjustment amount can be predefined according to the character of UE, and UE, carrying out weight vector while choosing, can obtain new weight vector according to this table of comparisons, example, work as l
i=1 o'clock, the corresponding relation of TPC accumulated value and weight vector adjustment amount can be as shown in table 2, has+6 ,+4 ,+2,0 ,-2 ,-4 ,-6 totally 7 kinds of TPC accumulated value situations, respectively correspondence-θ within an assessment cycle
3,-θ
2,-θ
1, θ
0, θ
1, θ
2, θ
3weight vector adjustment amount, the last corresponding angle of weight vector adjustment of new weight vector obtains, the TPC accumulated value even obtaining is+2, the weight vector adjustment amount of mapping is-θ
1, last weight vector rotates the angle-θ of weight vector adjustment amount
1, obtain new weight vector.
Table 2
In the weight vector method of adjustment of the transmit diversity that the embodiment of the present invention provides, different TPC accumulated value correspondences different weight vector adjustment amounts, instead of look like in prior art only with positive and negative differentiation TPC accumulated value result, therefore, the weight vector adjustment amount that TPC accumulated value is corresponding is more distinguished to refinement, and then making the weight vector value accuracy of renewal higher, renewal speed is fast, makes receiving terminal obtain good reception signal simultaneously.
Embodiment bis-
A kind of terminal equipment 40 that the embodiment of the present invention provides, as shown in Figure 4, comprising:
Selected cell 402, for carrying out the adjustment of weight vector according to weight vector adjustment amount.
Updating block 403, for carrying out the adjustment of weight vector according to weight vector adjustment amount.
Therefore, after cumulative unit is cumulative, obtain TPC accumulated value, selected cell carrys out corresponding different weight vector adjustment amount according to different TPC accumulated values, instead of look like in prior art only with positive and negative differentiation TPC accumulated value result, therefore, the weight vector adjustment amount that TPC accumulated value is corresponding is more distinguished to refinement, and then the weight vector value accuracy that updating block is upgraded is high, makes receiving terminal obtain good reception signal simultaneously.
This cumulative unit 401 is specifically within an assessment cycle cumulative TPC bid value, and the TPC accumulated value in assessment cycle obtains by following formula:
wherein, l
1≤ l
2≤ ...≤l
n; TPC
ifor i TPC bid value in assessment cycle, l
iit is the weights coefficient of i slot time; Described i slot time is the time difference in i TPC bid value feedback moment and described assessment cycle in last TPC bid value feedback moment.
Selected cell 402 specifically for: adjust the increment relation table of comparisons with reference to TPC accumulated value and code book index, choose the code book index corresponding with TPC accumulated value in assessment cycle and adjust increment; The code book index using when code book index is adjusted to increment and front weight vector adjustment is added and obtains new code book index, and the code book index based on new is determined weight vector adjustment amount.
Updating block 403 can also be used for: store the code book index using when a front weight vector is adjusted.
Selected cell also can be for: with reference to TPC accumulated value and weight vector adjustment amount comparison table, choose the weight vector adjustment amount corresponding with the size of the TPC accumulated value in assessment cycle.
Assessment cycle can be that twice weight vector upgrades interval, assessment cycle duration be N time slot.
The terminal equipment that the embodiment of the present invention provides, after its cumulative unit is cumulative, obtain TPC accumulated value, selected cell carrys out corresponding different weight vector adjustment amount according to different TPC accumulated values, instead of look like in prior art only with positive and negative differentiation TPC accumulated value result, therefore, the weight vector adjustment amount that TPC accumulated value is corresponding is more distinguished to refinement, and then the weight vector value accuracy that updating block is upgraded is high, renewal speed is fast, makes receiving terminal obtain good reception signal simultaneously.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (8)
1. a weight vector method of adjustment for transmit diversity, is characterized in that, comprising:
Cumulative transmitting power control TPC bid value within an assessment cycle;
Choose the weight vector adjustment amount corresponding with the size of the TPC accumulated value in described assessment cycle;
Carry out the adjustment of weight vector according to described weight vector adjustment amount;
The described TPC bid value that adds up within an assessment cycle comprises:
TPC accumulated value in described assessment cycle obtains by following formula:
wherein, l
1<l
2<...<l
n; TPC
ifor i TPC bid value in described assessment cycle, l
iit is the weights coefficient of i slot time; Described i slot time is the time difference in i TPC bid value feedback moment and described assessment cycle in last TPC bid value feedback moment.
2. method according to claim 1, is characterized in that, described in choose the weight vector adjustment amount corresponding with the size of the TPC accumulated value in described assessment cycle and comprise:
Adjust the increment relation table of comparisons with reference to TPC accumulated value and code book index, choose the code book index corresponding with TPC accumulated value in described assessment cycle and adjust increment;
The code book index using when described code book index is adjusted to increment and front weight vector adjustment is added and obtains new code book index, determines weight vector adjustment amount based on described new code book index.
3. method according to claim 2, is characterized in that, also comprises:
Store the code book index using when a described front weight vector is adjusted.
4. method according to claim 1, is characterized in that, described in choose the weight vector adjustment amount corresponding with the size of the TPC accumulated value in described assessment cycle and comprise:
With reference to TPC accumulated value and weight vector adjustment amount comparison table, choose the weight vector adjustment amount corresponding with the size of the TPC accumulated value in described assessment cycle.
5. a terminal equipment, is characterized in that, comprising:
Cumulative unit, for cumulative transmitting power control TPC bid value within an assessment cycle;
Selected cell, for choosing the weight vector adjustment amount corresponding with the size of the TPC accumulated value in described assessment cycle;
Updating block, for carrying out the adjustment of weight vector according to described weight vector adjustment amount;
Described cumulative unit is used for:
Cumulative TPC bid value within an assessment cycle, the TPC accumulated value in described assessment cycle obtains by following formula:
wherein, l
1<l
2<...<l
n; TPC
ifor i TPC bid value in described assessment cycle, l
iit is the weights coefficient of i slot time; Described i slot time is the time difference in i TPC bid value feedback moment and described assessment cycle in last TPC bid value feedback moment.
6. terminal equipment according to claim 5, is characterized in that, described selected cell is used for:
Adjust the increment relation table of comparisons with reference to TPC accumulated value and code book index, choose the code book index corresponding with TPC accumulated value in described assessment cycle and adjust increment;
The code book index using when described code book index is adjusted to increment and front weight vector adjustment is added and obtains new code book index, determines weight vector adjustment amount based on described new code book index.
7. terminal equipment according to claim 6, is characterized in that, described updating block also for:
Store the code book index using when a described front weight vector is adjusted.
8. terminal equipment according to claim 5, is characterized in that, described selected cell is used for:
With reference to TPC accumulated value and weight vector adjustment amount comparison table, choose the weight vector adjustment amount corresponding with the size of the TPC accumulated value in described assessment cycle.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1317891A (en) * | 2000-04-10 | 2001-10-17 | 三星电子株式会社 | Method and appts. for reckoning optimum weighting of mobile communication closed transmitting diversity |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1317891A (en) * | 2000-04-10 | 2001-10-17 | 三星电子株式会社 | Method and appts. for reckoning optimum weighting of mobile communication closed transmitting diversity |
Non-Patent Citations (4)
| Title |
|---|
| Ericsson, ST-Ericsson."Algorithm descriptions for UL Tx diversity for HSPA".《3GPP TSG RAN WG1 Meeting #59，R1-094982》.2009,第2-3页. |
| Ericsson, ST-Ericsson."Algorithm descriptions for UL Tx diversity for HSPA".《3GPP TSG RAN WG1 Meeting #59,R1-094982》.2009,第2-3页. * |
| Huawei."Link level simulation results for beamforming transmit diversity".《3GPP TSG RAN WG1 Meeting #59bis，R1-100155》.2010,全文. |
| Huawei."Link level simulation results for beamforming transmit diversity".《3GPP TSG RAN WG1 Meeting #59bis,R1-100155》.2010,全文. * |
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