CN1601946A - Closed-loop transmitting diversity method combined with closed-loop power control - Google Patents
Closed-loop transmitting diversity method combined with closed-loop power control Download PDFInfo
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- CN1601946A CN1601946A CNA031348513A CN03134851A CN1601946A CN 1601946 A CN1601946 A CN 1601946A CN A031348513 A CNA031348513 A CN A031348513A CN 03134851 A CN03134851 A CN 03134851A CN 1601946 A CN1601946 A CN 1601946A
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- 238000000034 method Methods 0.000 title claims description 17
- 230000010363 phase shift Effects 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 claims 2
- 238000012163 sequencing technique Methods 0.000 claims 1
- 230000002452 interceptive effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
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- 238000012546 transfer Methods 0.000 description 1
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Abstract
The invention provides capability of closed loop diversity for CDMA system of using single bit closed loop power control already. Controlling closed loop power and sending closed loop diversity can be realized at same time through redefining command of feedback, adding a pair of antennas, a phase shifter, power divider and relevant control circuit at base station under condition of not increasing additional feedback load at mobile station, and not increasing additional assistant pilot frequency at base station. Mobile station does not need to estimate channel conditions from two antennas respectively, does not need to know number of antenna at base station. When there is only one pair of antenna at base station, it still is a single bit closed loop power control system; when there is two pair of antenna at base station, it possesses function for sending closed loop diversity automatically.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to the closed-loop diversity transmitting and the purpose of closed loop transmit power control method of forward direction in the cdma system.
Background technology
Cdma system is interference-limited system, and the transmitting power of reasonable distribution base station makes that the base station is that each user's emitted power reaches the purpose that the quantity that needs can reach the saving base station transmitting power and reduce interference just, thereby effectively increases the capacity of system.Because a variety of causes such as travelling carriage motion, shade, rapid fading, interference variations, system need adopt closed loop transmission power control (hereinafter to be referred as closed-loop power control) technology to achieve the above object.A kind of closed-loop power control method commonly used is power or a wanted to interfering signal ratio of periodically being measured received signal by travelling carriage, and periodically sends the instruction of one 1 bit to the base station, requires the base station that its transmitting power is improved or reduce a fixed step size.This cycle is called a power control group.
If the base station has multiple antenna, rationally use these antenna to bring income for systematic function.One of average case of using many antennas at the base station end is, transmitting terminal (base station) has two slave antennas, and receiving terminal (travelling carriage) has common antenna.Send diversity technique and utilize the information of many antenna transmission identical content at transmitting terminal.Sending diversity can be (as STBC, STCC, the OTD etc.) of open loop, also can be (as STD, CL1, the CL2 etc.) of closed loop.The mode that open loop transmit diversity sends information is not controlled by travelling carriage; Closed-Loop Transmit Diversity sends by the control of travelling carriage.Because closed-loop diversity transmitting has the extra information from travelling carriage, so its performance is better than open loop transmit diversity, but in the system of Frequency Division Duplexing (FDD), the shortcoming of closed-loop diversity transmitting is to need extra reverse transfer ability so that travelling carriage can send the control information that realizes that closed loop diversity needs to the base station.Increasing extra feedback capability means will pay certain cost aspect reverse capacity.Some sends diversity system, the diversity (for example STBC, OTD, STD etc.) that comprises open loop and closed loop, need the base station to send auxiliary pilot being that travelling carriage can be measured the channel condition from two antennas respectively at second slave antenna, this point means that also forward-link capacity loses except having increased certain complexity.
Summary of the invention
Pin of the present invention designed single bit closed loop power control cdma system, additionally do not increase feedback load at travelling carriage, the base station does not additionally increase under the situation of auxiliary pilot, can realize the function of closed power control and closed loop diversity simultaneously.
In order to realize goal of the invention, the method that the present invention proposes comprises:
1, travelling carriage has redefined the single-bit control command of feedback.In the different power control group time, replace by the time, feedback bits is divided into two kinds of category-A bit and category-B bits.Category-A bit reflection moving table measuring to received power (perhaps wanted to interfering signal ratio) be higher than or be lower than the power control target value; Category-B bit reflection travelling carriage) received power (perhaps wanted to interfering signal ratio) that measures is higher than or is lower than the measured value in last power control group cycle, reflects promptly that also channel condition is to improve or degenerating.
2, two slave antennas are settled in the base station, and the signal that was sent to common antenna is originally sent two slave antennas simultaneously by half power separately, increase a phase shifter on second slave antenna.
3, the base station is controlled the phase-shift phase of phase shifter on the total transmitted power and second slave antenna simultaneously according to the feedback command that receives.The method that realize to send diversity is, the base station makes phase shifter move a fixing phase-shift value according to current phase shift direction in each power control group time, if receive the category-B bit and its indicating channel is degenerating, then changes the phase shift direction.The method that realizes transmission power control is: if receive the category-A bit, then also control transmitted power in a conventional way; When receiving the category-B bit,, then increase transmitting power with a bigger step-length if channel continues to degenerate and be lower than power control target; If channel continues to improve and be higher than power control target, then reduce transmitting power with a bigger step-length; If do not belong to both of these case, it is constant then to keep transmitting power.
The present invention to the air interface transformation of original system seldom.Travelling carriage does not need to know that there is common antenna the base station or two slave antennas are arranged, travelling carriage does not need to measure respectively the characteristic of channel of two slave antennas, travelling carriage does not need for realizing that closed-loop diversity transmitting additionally increases feedback command, and it is the Auxiliary Pilot Channel that the second slave antenna increase is used for the travelling carriage channel estimating that the base station does not need.
Description of drawings
Fig. 1. the system when adopting method of the present invention constitutes schematic diagram
Fig. 2. the concrete grammar of transmitted power and phase shift is controlled simultaneously according to receiving instruction in the base station
Embodiment
Further specify the present invention below in conjunction with drawings and Examples.
When adopting method of the present invention, the embodiment that system constitutes as shown in Figure 1, this figure comprises base station (11) and travelling carriage (12) two large divisions.
In base station portion, 12,13 is respectively first and second slave antenna; The 14th, the amplifier that power can be controlled; The 15th, power divider, it is assigned to the power averaging that sends signal on two antennas; The 16th, can stepping the phase shifter of control, its phase shift range must reach 360 °; Circuit 17 is used for controlling 15 and 16; 18 parts are the circuit that receive identification travelling carriage feedback command.Compare with the system of existing employing single bit closed loop power control, the part that the present invention increases newly is 13,15,16, and it is 17 that the present invention has done what change, remaining the 12,14, the 18th, the original part of existence just.
At travelling carriage part, the 22nd, reception antenna; The 23rd, the signal quality measuring circuit of travelling carriage, signal quality can show as the power of received signal, perhaps shows as the wanted to interfering signal ratio of received signal; 24 is delay storage circuits, and the input of its left side is 23 current measurement results, and its right output is 23 measurement results in the previous power control group cycle; Switch 25 is subjected to clock control, alternately switches by the power control group cycle.When switch was put, what the C point was exported was the category-B bit, and C=1 represents that the quality of travelling carriage received signal is improving; When switch deposited, what the C point was exported was the category-A bit, and C=1 represents that the quality of travelling carriage received signal is higher than power control target P
TargetThe C of comparator 26 outputs is binary bits.27 will instruct C to send to the base station, and each power control group time sends a bit.Compare with the system of existing employing single bit closed loop power control, the part that the present invention increases newly is 24,25, remaining the 22,23,26, the 27th, the original part that just exists.
Fig. 2 is the concrete operation method of 17 among Fig. 1, comprises power controlling and control phase two parts content.
1, transmission power control
(1) if C
1Be category-A bit, then C
1The quality of=1 expression received signal is better than power control target, and this moment, transmitted power reduced Δ
1Decibel; C
1The quality of=0 expression received signal is lower than power control target, and this moment, transmitted power increased Δ
1Decibel.
(2) if C
1Be the category-B bit, then
(a) C
1The quality of=1 expression received signal is changing towards good direction, and (this point shows as C if the signal quality of last cycle travelling carriage is higher than power control target
2=1), then transmitted power is reduced Δ
2Decibel, Δ
2Compare Δ
1Big; (this point shows as C if the signal quality of last cycle travelling carriage is lower than power control target
2=0) it is constant, then to keep original transmitted power.
(b) C
1The quality of=0 expression received signal is changing towards bad direction, and (this point shows as C if the signal quality of last cycle travelling carriage is lower than power control target
2=0), then transmitted power is increased Δ
2Decibel; (this point shows as C if the signal quality of last cycle travelling carriage is higher than power control target
2=1) it is constant, then to keep original transmitted power.
2, the control of the phase shift on second slave antenna
(1) in any power control group cycle, phase shifter all moves θ ° according to the phase shift direction of current setting.The forward phase shift is arranged the phase shift direction of current setting and oppositely two kinds of phase shifts are different, and its initial value can arbitrarily be provided with.
(2) work as C
1Be category-B bit and C
1=0 o'clock, the signal quality of travelling carriage was degenerating, and reverse the phase shift direction this moment.
Such phase control process will make the signal that sends on two slave antennas trend towards in the addition of travelling carriage homophase, thereby reach the purpose of closed-loop diversity transmitting.
Claims (5)
1. method that closed-loop diversity transmitting is provided for the cdma system that has adopted the single bit closed loop power control technology, it is characterized in that: travelling carriage redefines the implication of feedback bits, and the base station utilizes the feedback command of single-bit to realize closed power control and closed-loop diversity transmitting simultaneously.
2. the method for claim 1, it is characterized in that: travelling carriage alternately feeds back two types single-bit instruction by power control group time sequencing, the comparative result of category-A bit indication travelling carriage received signal and power control target, the comparative result of category-B bit indication travelling carriage received signal and previous moment measured value.
3. the method for claim 1, it is characterized in that: the base station increases by second slave antenna, and a phase shifter is set on second slave antenna, and the base station will send and send by two slave antennas simultaneously after signal is divided power equally.
4. the method for claim 1, it is characterized in that: in each power control group time, phase shifter moves a fixing phase shift value according to current phase shift direction, and the instruction of receiving when the base station is the category-B bit and represents channel when degenerating that current phase shift direction is reverse.
5. the method for claim 1 is characterized in that: carry out transmission power control when the category-A bit is received in the base station in a conventional manner.When the category-B bit is received in the base station,, then increase transmitting power with a bigger step-length if channel continues to degenerate and be lower than power control target; If channel continues to improve and be higher than power control target, then reduce transmitting power with a bigger step-length; If do not belong to both of these case, it is constant then to keep transmitting power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031348513A CN1601946A (en) | 2003-09-26 | 2003-09-26 | Closed-loop transmitting diversity method combined with closed-loop power control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031348513A CN1601946A (en) | 2003-09-26 | 2003-09-26 | Closed-loop transmitting diversity method combined with closed-loop power control |
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| CN1601946A true CN1601946A (en) | 2005-03-30 |
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| CNA031348513A Pending CN1601946A (en) | 2003-09-26 | 2003-09-26 | Closed-loop transmitting diversity method combined with closed-loop power control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101682385A (en) * | 2007-06-12 | 2010-03-24 | 艾利森电话股份有限公司 | Diversity transmission using a single power amplifier |
| CN102215055A (en) * | 2011-06-08 | 2011-10-12 | 中兴通讯股份有限公司 | Method and device for sending data |
| WO2012155547A1 (en) * | 2011-08-16 | 2012-11-22 | 中兴通讯股份有限公司 | Method and system for controlling uplink closed loop transmit diversity |
| CN103326824A (en) * | 2012-03-23 | 2013-09-25 | 中兴通讯股份有限公司 | Configuration method, system and network controller transmitting diversity in an uplink and closed-loop mode |
-
2003
- 2003-09-26 CN CNA031348513A patent/CN1601946A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101682385A (en) * | 2007-06-12 | 2010-03-24 | 艾利森电话股份有限公司 | Diversity transmission using a single power amplifier |
| CN102215055A (en) * | 2011-06-08 | 2011-10-12 | 中兴通讯股份有限公司 | Method and device for sending data |
| WO2012155547A1 (en) * | 2011-08-16 | 2012-11-22 | 中兴通讯股份有限公司 | Method and system for controlling uplink closed loop transmit diversity |
| CN102938664A (en) * | 2011-08-16 | 2013-02-20 | 中兴通讯股份有限公司 | Method and system for controlling uplink closed-loop transmit diversity |
| CN102938664B (en) * | 2011-08-16 | 2017-12-15 | 中兴通讯股份有限公司 | A kind of method and system for controlling uplink closed loop transmitting diversity |
| CN103326824A (en) * | 2012-03-23 | 2013-09-25 | 中兴通讯股份有限公司 | Configuration method, system and network controller transmitting diversity in an uplink and closed-loop mode |
| CN103326824B (en) * | 2012-03-23 | 2019-02-05 | 中兴通讯股份有限公司 | A kind of uplink closed loop sends configuration method, system and the network controller of diversity |
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