CN1829115A - Downlink closed-loop transmitting and diversity method when uplink discontinuous transmitting of wireless system - Google Patents
Downlink closed-loop transmitting and diversity method when uplink discontinuous transmitting of wireless system Download PDFInfo
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- CN1829115A CN1829115A CN 200610072789 CN200610072789A CN1829115A CN 1829115 A CN1829115 A CN 1829115A CN 200610072789 CN200610072789 CN 200610072789 CN 200610072789 A CN200610072789 A CN 200610072789A CN 1829115 A CN1829115 A CN 1829115A
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Abstract
The present invention discloses down closed loop transmitting diversity method in uplink discontinuance transmission of wireless system. It contains 1, when uplink is not DTX, base station utilizes regular closed loop transmission diversity method to calculate aerial weight(ed) value, weighing aerial and to proceed relevant down link downgoing signal transmission, 2, when uplink enters DTX state, base station takes the measurements to two aerials respectively received uplink SB signal quality in each SBGP cycle, selecting aerial with preferable signal receiving quality as down link signal transmission aerial in relevant SBGP cycle, 3, when uplink exits DTX state, base station recovering utilizing regular closed loop transmission diversity method to calculate aerial weight(ed) value, weighing aerial and to proceed down link downgoing signal transmission, and changing to step 1.Said method raises downlink performance in uplink DTX state.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the downlink closed-loop emission diversity method in up discontinuous when emission in a kind of TDD wireless communication system.
Background technology
Diversity technique is an important anti-fading technology, is widely used in mobile communication particularly in the 3-G (Generation Three mobile communication system).The transmit diversity of the tdd mode of 3-G (Generation Three mobile communication system) just utilizes two antennas, and is separated by a distance, sends respectively on time or space, thereby is convenient to the quality that independence that receiving terminal utilizes two paths of signals is improved received signal.
In UTRA (Universal Telecommunication Radio Access) TDD 1.28Mcps system, the diversity mode of supporting comprises time switched transmit diversity (TSTD), Closed-Loop Transmit Diversity (CLTD) and bell idles transmitting diversity (SCTD), TSTD wherein and CLTD pattern are very little to the receiver structure influence of terminal, are widely used.
In UTRA TDD 3.84/1.28Mcps system, most of wireless environment for the non-high-speed mobile of subscriber equipment, use in the base station under the situation of equal transmit power, adopt CLTD than adopting TSTD can improve the performance of down link significantly, so for the UTRATDD base station that is equipped with double antenna, using the CLTD transmit diversity is the means of raising down-link performance effective and commonly used.
For UTRA TDD system, when if the high level of base station or subscriber equipment does not have data to offer coded combination transmission channel (CCTrCH) in Transmission Time Interval (TTI), base station and subscriber equipment can be that unit implements discontinuous emission (DTX) with the coded combination transmission channel.When discontinuous emission acts on certain CCTrCH, this CCTrCH stops conventional data transmission, change into certain cycle emission special burst (SBs, Special Bursts), the up SB emission cycle is called SBGP (special burst generation period), and the descending SB emission cycle is called SBSP (special burst schedulingperiod).The enforcement of discontinuous emission eats dishes without rice or wine to disturb, save the subscriber equipment energy consumption to minimizing and implement between the frequency of wireless system/and switch between system positive role is arranged.
For UTRA TDD 3.84/1.28Mcps system, when discontinuous emission acts on up CCTrCH, can exert an influence for the base station down performance that adopts Closed-Loop Transmit Diversity.
Referring to Fig. 1, among the figure transmitter architecture figure of the downlink closed-loop transmit diversity of UTRATDD 1.28Mcps system.When non-up DTX, the TDD base station is according to the upward signal that two antennas receive, when calculating corresponding downlink to the weighted value w1 and the w2 of two antennas; When up DTX, up CCTrCH is in discontinuous emitting state, the base station except receive with cycle of SBGP radio frames do not have the SB upward signal can so that the base station in order to calculating antenna weight w 1 and w2, during promptly up DTX, the closed loop condition of downlink closed-loop transmit diversity does not exist.If the corresponding downlink when at this moment adopting the mode of non diversity (single antenna) emission to finish up DTX, down-link performance can't obtain descending diversity gain, and the down-link performance during to up DTX has a negative impact.
Summary of the invention
Downlink closed-loop emission diversity method when the technical problem that the present invention solves provides up discontinuous emission in a kind of TDD wireless system overcomes the shortcoming that the TDD base station down link when up DTX that adopts Closed-Loop Transmit Diversity can't carry out descending diversity.
The present invention specifically is achieved in that
Downlink closed-loop transmitting and diversity method when uplink discontinuous transmitting in the wireless system may further comprise the steps:
Step 1, during the non-DTX of up link, the base station utilizes conventional Closed-Loop Transmit Diversity method to calculate the antenna weights, to antenna weighting and carry out the downstream signal emission of corresponding downstream link;
Step 2, when up link enters the DTX state, the base station is measured at the up special burst signal quality that receives respectively on to two antennas in each up emission cycle, and selective reception better quality of signal antenna is as the signal transmitting antenna of interior corresponding downstream link of this up emission cycle;
Step 3, up link withdraw from the DTX state, and the base station recover to utilize conventional Closed-Loop Transmit Diversity method to calculate the antenna weights, to antenna weighting and carry out the downstream signal emission of corresponding downstream link, and forward step 1 to.
Described step 1 to three is implemented respectively each uplink coding combination of transmitted channel in the system by the base station.
Described step 2 is carried out downlink sky line options one time in each up emission cycle, the downlink closed-loop antenna selectivity diversity process when finishing up DTX.
The signal strength indicator that up special burst signal quality in the described step 2 is up SB, and/or the signal to noise ratio index of up SB.
Can see by technique scheme, during up DTX, the method of the invention relies on the uplink/downlink antenna selective diversity of the closed loop that up SB signal realized to the TDD base station of using closed loop transmit diversity techniques, makes down link can both obtain certain downlink closed-loop diversity gain when up DTX and non-up DTX.
Non diversity (single antenna) downlink transmission method of method of the present invention during with respect to up DTX, during up DTX, obtained the uplink/downlink antenna selective diversity gain of closed loop, especially for SBGP cycle of up discontinuous emission hour, the down-link performance when said method can be to up DTX produces bigger raising.
Description of drawings
Fig. 1 is the transmitter architecture figure of downlink closed-loop transmit diversity;
Fig. 2 is the flow chart of the inventive method.
Embodiment
Below in conjunction with accompanying drawing specific implementation of the present invention is made and to be further described.
Be the flow chart of the inventive method as shown in Figure 2, concrete steps are as follows:
Step 1: up link is in non-DTX state, and the base station utilizes conventional Closed-Loop Transmit Diversity method to calculate the antenna weights, to antenna weighting and carry out the downstream signal emission of corresponding downstream link;
Step 2: when up link enters the DTX state, the base station is measured at up special burst (SB) signal quality that each SBGP received respectively on to two antennas in the cycle, selective reception better quality of signal antenna is as the signal transmitting antenna of this SBGP corresponding downstream link in the cycle, the process of step 2 is carried out during up DTX circularly continuously, be to carry out downlink sky line options every SBGP cycle one time, the downlink closed-loop antenna selectivity diversity process when finishing up DTX;
Step 3: up link withdraws from the DTX state, and the base station recover to utilize conventional Closed-Loop Transmit Diversity method to calculate the antenna weights, to antenna weighting and carry out the downstream signal emission of corresponding downstream link, and forwards step 1 to.
Said method is implemented respectively each up link (CCTrCH) in the system by the base station.
" signal quality " described in the step 2 in " base station is measured at up special burst (SB) signal quality that each SBGP received respectively on to two antennas in the cycle ", can be but be not limited to be the signal strength indicator of up SB, and/or the signal to noise ratio index of up SB.
The form of two descending diversity of antenna has been adopted in the above-mentioned description at UTRA TDD of the present invention, according to thought of the present invention, also can use method of the present invention in more than the TDD down transmission diversity equipment of two antennas.
Method of the present invention has also obtained the diversity gain that the uplink/downlink antenna selection is produced when being in up DTX in the diversity base station, especially for SBGP cycle of up discontinuous emission hour, the down-link performance when said method can be to up DTX produces bigger raising.
Claims (4)
1, downlink closed-loop transmitting and diversity method when uplink discontinuous transmitting in the wireless system is characterized in that, may further comprise the steps:
Step 1, during the non-DTX of up link, the base station utilizes conventional Closed-Loop Transmit Diversity method to calculate the antenna weights, to antenna weighting and carry out the downstream signal emission of corresponding downstream link;
Step 2, when up link enters the DTX state, the base station is measured at the up special burst signal quality that receives respectively on to two antennas in each up emission cycle, and selective reception better quality of signal antenna is as the signal transmitting antenna of interior corresponding downstream link of this up emission cycle;
Step 3, up link withdraw from the DTX state, and the base station recover to utilize conventional Closed-Loop Transmit Diversity method to calculate the antenna weights, to antenna weighting and carry out the downstream signal emission of corresponding downstream link, and forward step 1 to.
2, downlink closed-loop transmitting and diversity method when uplink discontinuous transmitting in the wireless system as claimed in claim 1 is characterized in that:
Described step 1 to three is implemented respectively each uplink coding combination of transmitted channel in the system by the base station.
3, downlink closed-loop transmitting and diversity method when uplink discontinuous transmitting in the wireless system as claimed in claim 1 or 2 is characterized in that:
Described step 2 is carried out downlink sky line options one time in each up emission cycle, the downlink closed-loop antenna selectivity diversity process when finishing up DTX.
4, downlink closed-loop transmitting and diversity method when uplink discontinuous transmitting in the wireless system as claimed in claim 1 or 2 is characterized in that:
The signal strength indicator that up special burst signal quality in the described step 2 is up SB, and/or the signal to noise ratio index of up SB.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100727897A CN100472982C (en) | 2006-04-11 | 2006-04-11 | Downlink closed-loop transmitting and diversity method when uplink discontinuous transmitting of wireless system |
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| CNB2006100727897A CN100472982C (en) | 2006-04-11 | 2006-04-11 | Downlink closed-loop transmitting and diversity method when uplink discontinuous transmitting of wireless system |
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| CN1829115A true CN1829115A (en) | 2006-09-06 |
| CN100472982C CN100472982C (en) | 2009-03-25 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011157107A3 (en) * | 2011-05-30 | 2012-04-19 | 华为技术有限公司 | Method and device for data transmission in multiple antennas system |
| CN101207422B (en) * | 2007-11-30 | 2012-06-27 | 上海华为技术有限公司 | Apparatus, base station and method for sending data |
| CN102647256A (en) * | 2011-02-18 | 2012-08-22 | 华为技术有限公司 | Transmission method and device of precoding control indication information |
| CN101388701B (en) * | 2007-09-10 | 2012-11-07 | 大唐移动通信设备有限公司 | Customer data receiving/transmitting method, apparatus and distributed intelligent antenna system |
| CN112511207A (en) * | 2020-11-03 | 2021-03-16 | 广州技象科技有限公司 | Multi-antenna diversity transmission method and device based on power consumption management |
-
2006
- 2006-04-11 CN CNB2006100727897A patent/CN100472982C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388701B (en) * | 2007-09-10 | 2012-11-07 | 大唐移动通信设备有限公司 | Customer data receiving/transmitting method, apparatus and distributed intelligent antenna system |
| CN101207422B (en) * | 2007-11-30 | 2012-06-27 | 上海华为技术有限公司 | Apparatus, base station and method for sending data |
| CN102647256A (en) * | 2011-02-18 | 2012-08-22 | 华为技术有限公司 | Transmission method and device of precoding control indication information |
| CN102647256B (en) * | 2011-02-18 | 2014-12-31 | 华为技术有限公司 | Transmission method and device of precoding control indication information |
| WO2011157107A3 (en) * | 2011-05-30 | 2012-04-19 | 华为技术有限公司 | Method and device for data transmission in multiple antennas system |
| CN102918780A (en) * | 2011-05-30 | 2013-02-06 | 华为技术有限公司 | Method and device for data transmission in multiple antennas system |
| US9008219B2 (en) | 2011-05-30 | 2015-04-14 | Huawei Technologies Co., Ltd. | Method and apparatus for transmitting data in multiple-antenna system |
| CN102918780B (en) * | 2011-05-30 | 2016-03-09 | 华为技术有限公司 | Data transmission method for uplink in a kind of multiaerial system and device |
| CN112511207A (en) * | 2020-11-03 | 2021-03-16 | 广州技象科技有限公司 | Multi-antenna diversity transmission method and device based on power consumption management |
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| CN100472982C (en) | 2009-03-25 |
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