CN101170812A - A signal receiving method for base station receiver - Google Patents
A signal receiving method for base station receiver Download PDFInfo
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- CN101170812A CN101170812A CNA2006101500378A CN200610150037A CN101170812A CN 101170812 A CN101170812 A CN 101170812A CN A2006101500378 A CNA2006101500378 A CN A2006101500378A CN 200610150037 A CN200610150037 A CN 200610150037A CN 101170812 A CN101170812 A CN 101170812A
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Abstract
The invention provides a signal receiving method for a base station receiver used in a 3G long term evolution (LTE) system. The method is essentially a user access process of performing multi-carrier demodulation and related tests to a receiving signal based on the uplink random access process of a user packet. The invention can effectively receive signal in a LTE uplink random access process based on the user packet and test the received signal, so as to realize access/collision detection, hence implementing multi-user random access. Meanwhile, the invention performs related computation in frequency domain, so as to reduce computation complexity.
Description
Technical field
The present invention relates to a kind of portable terminal access technology, particularly third generation mobile long evolving system, in the uplink random access procedure based on user grouping, the technology of base station receiver.
Background technology
As everyone knows, in cellular mobile communication, when the portable terminal application networks, earlier send the networking solicited message, the time synchronized of the up link of reentrying and can access network to the base station.In existing LTE (third generation mobile long evolving system) uplink random access method, there are TDM (time division multiplexing), FDM (frequency division multiplexing), CDM (code division multiplexing) and several access waies of TDM/FDM.
Packet-based LTE uplink random access procedure involves a plurality of users' competitive resource, can have the problem of a collision, and it will directly have influence on user's the access success rate and the resource allocation of system.At present, also there is not a cover to be fit to the signal acceptance method of the base station receiver of this process.
Summary of the invention
The present invention proposes a kind of signal acceptance method of base station receiver, at LTE (third generation mobile Long Term Evolution) uplink random access procedure based on user grouping, under the situation that a plurality of users insert at random, receive and detection signal, thereby finish user's access at random.
The technical solution used in the present invention is:
A kind of signal acceptance method of base station receiver is applied to third generation communication long evolving system, in the uplink random access procedure based on user grouping, it is characterized in that comprising:
Step 1: the radiofrequency signal of reception antenna (9) mobile terminal receive emission;
Step 2: rf receiver unit (10) obtains baseband signal with described radiofrequency signal down-conversion;
Step 3: A/D converting unit (11) is carried out the A/D conversion with described baseband signal, obtains discrete signal;
Step 4: serial (12) becomes described discrete signal into multi-path parallel signal by serial signal;
Step 5: Fourier transformation unit (13) is carried out Fourier transform to described parallel signal, obtains frequency-region signal, finishes the demodulation of multicarrier;
Step 6: subcarrier is separated map unit (14) described frequency-region signal is separated the signal that mapping reverts to transmission by subcarrier;
Step 7: coherent detection unit (15) carry out related operation with the signal of described recovery with local code element;
Step 8: Threshold detection decision unit (16) detects judgement to the result of described related operation, detects the access that signal is finished the user after leading.
Further, in the described step 8,, think that signal is leading to be detected when detected power during greater than a predefined threshold value.
Further, in the described step 5, Fourier transform adopts fast fourier algorithm.
Further, in the described step 7, the coherent reference code character that coherent detection unit (15) are adopted is identical with the current available leading code character in this sub-district.
Further, in the described step 5, for a plurality of users that insert simultaneously, a plurality of users' that coherent detection unit (15) are received with synchronization lead code superposition signal and reference signal are carried out related operation.
Adopt technical scheme of the present invention, can be in LTE uplink random access procedure based on user grouping, effective received signal, and it is detected realizing inserting collision determination, thereby finish a plurality of users' access at random; The present invention simultaneously is chosen in frequency domain and carries out related operation, has reduced the complexity of computing.
Description of drawings
Fig. 1 is the RACH frame assumption diagram of embodiment 1;
Fig. 2 is the subframe structure figure of the RACH of embodiment 1;
Fig. 3 is the flow chart that the base station receiver of embodiment 1 receives the RACH signal.
Embodiment
Embodiment 1, and a kind of signal acceptance method of base station receiver is applied to third generation communication long evolving system, in the uplink random access procedure based on user grouping; Present embodiment will be in conjunction with the method for reseptance of RACH signal, and the invention will be further described.
Usually the transmission of RACH signal has two parts, and a part is that transmission RACH is leading, and it is synchronous to be used for obtaining access and estimated time fast; Another part is the transmission of RACH information, comprises RACH packet information and related control information mutually.The present invention is applied in the LTE uplink random access procedure based on user grouping, and the invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is a RACH frame assumption diagram of the present invention.
A RACH frame is 10ms, and it is made up of 20 RACH subframes, and each subframe is 0.5ms, and each subframe is made up of 7 RACH symbols.
Fig. 2 is the subframe structure figure of RACH of the present invention.
The RACH symbol may reside in a RACH subframe.As shown in the figure, 7 RACH symbols are arranged in the subframe, can all be used for leadingly, also can partly be used for doing leading.In order to keep the character of targeting sequencing, the RACH symbol should not add CP in Fig. 2, if add CP, the character of RACH sequence is just destroyed.
In addition, for different radius of societies, the number of symbols difference that the RACH bandwidth needs.If the radius of sub-district is less than 5Km, leading cycle of RACH is in a period of sub-frame.Yet if the radius of sub-district surpasses 5Km, it is leading just to need more subframes to carry RACH.
LTE RACH structure has following characteristics:
(1) cycle of RACH symbol is different from the cycle of up voluntary scheduling channel.
(2) the RACH symbol does not add CP and can obtain the desirable sampling time; In order to keep the character of targeting sequencing, the RACH symbol should not add CP, if add CP, the character of RACH sequence is just destroyed.
(3) problem of estimating settling time is used the frequency domain detection device, and a plurality of symbols repeat to detect the RACH signal in order to gather enough energy.If adopt the detector of time domain, the complexity of Ji Suaning is just very big so.
(4) owing to be subjected to the influence of radius of society, the length of fixing each symbol is constant, can adopt repeated mode to detect.
The scheme that access is at random reused in many sub-districts is as follows: consider on a plurality of sub-districts, in each sub-district, be divided into a plurality of time slots on time domain, referring to Fig. 1, be divided into a plurality of RACH bandwidth on frequency domain, the RACH bandwidth is given each sub-district; In order to reduce the interference of many minizones, the CAZAC sign indicating number is divided into many subclass, each subclass is given each sub-district.The CAZAC subclass can be in the sub-district recycling that closes on, and RACH takies different frequency resources in these sub-districts.In same sub-district,, in these different frequency chunks resources, all adopt identical codeword set if a plurality of frequency chunks access-in resources are arranged.
Embodiment 1, base station receiver receives the method for RACH signal, its job step is as follows, referring to Fig. 3: reception antenna 9 receives the signal of emission in the base station receiver, at first carries out down-conversion by rf receiver unit 10, samples by A/D converting unit 11 again, obtain baseband signal, after obtaining the N channel parallel data by serial 12, obtain N road frequency-region signal, detect by frequency domain through Fourier transformation unit conversion 13.At first will be according to the subcarrier allocation table, separate map unit 14 by subcarrier and carry out subcarrier and separate mapping, recover to send the base band frequency-region signal of signal, detect by coherent detection unit 15 then; The correlation detector that the essence of coherent detection unit 15 is made up of K correlator, the base band frequency-region signal that sends is made related operation respectively with K local code element, detect the power of the signal behind each related operation, carry out Threshold detection by Threshold detection decision unit 16 then, in case the power that detects is greater than a predefined threshold value, the RACH signal is leading just to be detected.
The essence of base station receiver part of the present invention is the user's access procedure that carries out the multicarrier demodulation to received signal and carry out coherent detection.
The principles illustrated of coherent detection unit 15: in the design of targeting sequencing, will adopt to have good autocorrelation and the lower sequence of cross correlation improves the detection performance.Involve a plurality of users' competitive resource in the process that inserts at random, can have the problem of a collision, it will directly have influence on user's the access success rate and the resource allocation of system.The base station adopts related algorithm to realize inserting the detection of collision.The coherent reference code character that adopt the base station is identical with the current available leading code character in this sub-district.A plurality of users' that the base station is received with synchronization lead code superposition signal and reference signal are carried out related operation, by the detection of correlation peak, realize inserting collision determination.Its basic thought is to judge all possible sequence according to the power of the correlated series that receives, and inserts the user, and related operation can be finished in time domain or frequency domain.But understand the complexity that increases calculating in time domain.The present invention adopts the method for frequency domain detection.
The basic thought that detects is the power that the detection afterwards that carries out related calculation according to sequence that receives and all possible sequence receives.In case the power that detects is greater than a predefined threshold value, the RACH signal is leading just to be detected.Be easy to see that the selection of thresholding has determined the detection performance.Adopt probability of false detection and false alarm probability on Performance Evaluation, it is defined as:
Probability of false detection=Pr (signal is not detected | and the RACH signal transmits)
Claims (5)
1. the signal acceptance method of a base station receiver is applied to third generation communication long evolving system, in the uplink random access procedure based on user grouping, it is characterized in that comprising:
Step 1: the radiofrequency signal of reception antenna (9) mobile terminal receive emission;
Step 2: rf receiver unit (10) obtains baseband signal with described radiofrequency signal down-conversion;
Step 3: A/D converting unit (11) is carried out the A/D conversion with described baseband signal, obtains discrete signal;
Step 4: serial (12) becomes described discrete signal into multi-path parallel signal by serial signal;
Step 5: Fourier transformation unit (13) is carried out Fourier transform to described parallel signal, obtains frequency-region signal, finishes the demodulation of multicarrier;
Step 6: subcarrier is separated map unit (14) described frequency-region signal is separated the signal that mapping reverts to transmission by subcarrier;
Step 7: coherent detection unit (15) carry out related operation with the signal of described recovery with local code element;
Step 8: Threshold detection decision unit (16) detects judgement to the result of described related operation, detects the access that signal is finished the user after leading.
2. in accordance with the method for claim 1, it is characterized in that: in the described step 8,, think that signal is leading to be detected when detected power during greater than a predefined threshold value.
3. in accordance with the method for claim 1, it is characterized in that: in the described step 5, Fourier transform adopts fast fourier algorithm.
4. in accordance with the method for claim 1, it is characterized in that: in the described step 7, the coherent reference code character that coherent detection unit (15) are adopted is identical with the current available leading code character in this sub-district.
5. in accordance with the method for claim 1, it is characterized in that: in the described step 5, for a plurality of users that insert simultaneously, a plurality of users' that coherent detection unit (15) are received with synchronization lead code superposition signal and reference signal are carried out related operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101500378A CN101170812A (en) | 2006-10-24 | 2006-10-24 | A signal receiving method for base station receiver |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101500378A CN101170812A (en) | 2006-10-24 | 2006-10-24 | A signal receiving method for base station receiver |
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| CN101170812A true CN101170812A (en) | 2008-04-30 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010072178A1 (en) * | 2008-12-26 | 2010-07-01 | 大唐移动通信设备有限公司 | Transmitting and receiving method for carrier aggregation multi-carrier system and data transmission device |
| WO2010115304A1 (en) * | 2009-04-09 | 2010-10-14 | 华为技术有限公司 | A method for random accessing, evolution-node b and terminal equipment |
| CN101977170A (en) * | 2010-10-15 | 2011-02-16 | 北京星河亮点通信软件有限责任公司 | Random access detection device and detection method in TD-LTE (Time Division-Long Term Evolution) system |
| CN101765127B (en) * | 2009-12-14 | 2012-01-04 | 西安交通大学 | WLAN base station access system and intelligent positioning transceiving method |
| CN101997590B (en) * | 2009-08-10 | 2014-06-11 | 中兴通讯股份有限公司 | Method for detecting random access signal and baseband processing plate as well as base station |
-
2006
- 2006-10-24 CN CNA2006101500378A patent/CN101170812A/en not_active Withdrawn
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010072178A1 (en) * | 2008-12-26 | 2010-07-01 | 大唐移动通信设备有限公司 | Transmitting and receiving method for carrier aggregation multi-carrier system and data transmission device |
| WO2010115304A1 (en) * | 2009-04-09 | 2010-10-14 | 华为技术有限公司 | A method for random accessing, evolution-node b and terminal equipment |
| US8411642B2 (en) | 2009-04-09 | 2013-04-02 | Huawei Technologies Co., Ltd. | Random access method, evolved node B, and terminal equipment |
| US8488560B2 (en) | 2009-04-09 | 2013-07-16 | Huawei Technologies Co., Ltd. | Random access method, evolved node B, and terminal equipment |
| US8908646B2 (en) | 2009-04-09 | 2014-12-09 | Huawei Technologies Co., Ltd. | Random access method, evolved Node B, and terminal equipment |
| US9036606B2 (en) | 2009-04-09 | 2015-05-19 | Huawei Technologies Co., Ltd. | Random access method, evolved node B, and terminal equipment |
| US9554310B2 (en) | 2009-04-09 | 2017-01-24 | Huawei Technologies Co., Ltd. | Random access method, evolved Node B, and terminal equipment |
| CN101997590B (en) * | 2009-08-10 | 2014-06-11 | 中兴通讯股份有限公司 | Method for detecting random access signal and baseband processing plate as well as base station |
| CN101765127B (en) * | 2009-12-14 | 2012-01-04 | 西安交通大学 | WLAN base station access system and intelligent positioning transceiving method |
| CN101977170A (en) * | 2010-10-15 | 2011-02-16 | 北京星河亮点通信软件有限责任公司 | Random access detection device and detection method in TD-LTE (Time Division-Long Term Evolution) system |
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