CN104426627B - The sending method of uplink detection reference signal in a kind of TDD system - Google Patents
The sending method of uplink detection reference signal in a kind of TDD system Download PDFInfo
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- CN104426627B CN104426627B CN201310364955.0A CN201310364955A CN104426627B CN 104426627 B CN104426627 B CN 104426627B CN 201310364955 A CN201310364955 A CN 201310364955A CN 104426627 B CN104426627 B CN 104426627B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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Abstract
The present invention provides a kind of method that uplink detection reference signal is sent in TDD wireless communication systems, and this method includes：Step A：As the parameter needed for base station selected terminal sends uplink detection reference signal, and by parameter configuration to terminal；Step B：Terminal produces uplink detection reference signal according to the parameter received, and the uplink detection reference signal is sent on the fixed position of sub-frame of uplink.The present invention solve the problems, such as detective bandwidth is imperfect, interfering between the terminal under same base station and uplink channel information measurement not in time.
Description
Technical field
The present invention relates to wireless communication field, more particularly to one kind in TDD（Time division duplex）System in send it is up
The method of detection reference signal.
Background technology
In a wireless communication system, between terminal and base station in addition to sending data-signal, generally also need to send
Known reference signal, for estimating radio channel state, carry out coherent demodulation.Particularly in time division duplex（TDD）In system,
Because uplink and downlink channel uses identical frequency, therefore channel status has reciprocity, i.e., by being carried out to reception signal
Channel estimation, in addition to it can obtain the our channel status to link, the channel status that can also obtain opposite direction link is estimated
Meter, can be the offer references such as Power Control, scheduling of resource.
When system uses orthogonal frequency division multiplexing multiple access mode（OFDMA）Or single carrier frequency division multiplexing multi-access mode（SC-
FDMA）When, the data of different terminals are to take different subcarriers to be transmitted on frequency domain.Because broad-band channel has frequency
The characteristics of rate Selective intensity, channel fading of the different terminals on different subcarriers are different, and base station side is adjusted in resource
Selection relatively good subcarrier of channel quality for some user transmits the data of the terminal when spending, and can significantly improve
The transmission rate of whole system.The dispatching method requirement of this frequency selection can obtain each terminal in base station side and be entirely
Channel condition information on regiment commander's width.
Terminal would generally send some ascending pilot frequencies, the coherent demodulation for upstream data in upward signal with data.
Base station can utilize the uplink channel status of these upstream data pilot tones estimation terminal in common system.But this method is present
Problems with：First, data pilot generally only occupies certain bandwidth, therefore base station side can not obtain the channel estimation of full frequency band,
So as to which the Optimized Operation of frequency domain can not be carried out.Second, when the data pilot of different terminals generally takes up different in sub-frame of uplink
Gap, for distributing for the terminal for starting time slot transmission in sub-frame of uplink, the channel condition information that measures be applied to it is descending
Time delay during transmission has at least lagged the length of a sub-frame of uplink.For frame length, long and fast channel variation system is come
Say, the uplink channel status so measured is ageing poor.
For problem above, employed in some wireless communication systems and special detection is sent in upward signal
（Sounding）The method of signal obtains uplink channel status.Such as in Long Term Evolution（Long Term Evolution,
LTE）In system, base station can send uplink SRS with dispatch terminal（Sounding Reference Signal）To carry out up letter
Road measures.The sending method of SRS specified in LTE is：
Last SC_FDMA symbol in the sub-frame of uplink that each length is 1ms can be used for sending SRS.Often
Individual UE can select different bandwidth to send SRS, and in the Sounding bandwidth of selection, each terminal is with comb spectrum（comb-
likespectrum）Mode send SRS, i.e., at regular intervals, every RPF（RePetition Factor）Individual subcarrier
A SRS symbol is sent, and provides RPF=2.Different UE can send SRS signal within identical time and bandwidth, as long as
The comb spectrum of their occupancy is different, or the different cyclic shifts using SRS signal.Generally up SRS signal has
Good circulation autocorrelation performance, the i.e. sequence and the sequence as caused by the sequence cyclic shift are orthogonal, so as to ensure
Base station side can detect the SRS signal for coming from different terminals respectively.
Find out from the above description, the sending method of the SRS in LTE at least has problems with：
First, terminal sends SRS bandwidth still less than system bandwidth under normal circumstances so that every time can only in base station side
Obtain the channel estimation in local frequency.Can be by selecting frequency hopping in LTE（Frequency Hopping）Scheme makes up
Sounding bandwidth it is imperfect, but this to need to obtain in complete system bandwidth by multiple Sounding
Channel estimation, the time delay and expense of measurement are all bigger.
Second, distinguishing different terminals using the cyclic shift of same SRS sequences in LTE, this requires each terminal
The delay spread of channel be less than cyclic shift, otherwise the Sounding signals of different terminals can produce crosstalk.Allow 8 in LTE
Kind cyclic shift, corresponding maximum delay extension are less than 4us.For some special GSMs, particularly great Qu systems
The GSM of covering, the delay spread of channel is much larger than 4us, therefore available cyclic shift number is seldom.
Third, in LTE when different terminals is sending Sounding signals in different bandwidth, its Sounding signal
Length it is different.It can not ensure preferable cross correlation between the Sounding signals of these different lengths, cause different UE
Sounding signals between there may be different degrees of interference.
The content of the invention
Present invention mainly solves technical problem include：
Orthogonal frequency division multiplexing multiple access mode is used up（OFDMA）Or single carrier frequency division multiplexing multi-access mode（SC-
FDMA）TDD wireless communication systems in, the method that sends uplink detection reference signal, this method can cause base station timely
Obtain uplink channel status information；Base station can obtain the channel condition information in the full frequency band of each terminal；What terminal was sent
Detectable signal is not limited by channel delay spread；It is not present and interferes between the detectable signal that different terminals are sent.
The invention discloses a kind of method that uplink detection reference signal is sent in TDD wireless communication systems, this method
Including：
Step A：As the parameter needed for base station selected terminal sends uplink detection reference signal, and by parameter configuration to eventually
End；
Step B：End side produces uplink detection reference signal according to the configuration parameter received, and in the fixation of sub-frame of uplink
The uplink detection reference signal is sent on position.
Step A as described above, base station, which configures parameter required for each terminal sends uplink detection reference signal, to be included：This
The uplink detection reference signal that base station selects according to identity information is numbered, and wherein adjacent base station selects different uplink detection references
Signal is numbered, and all terminals of same base station are numbered using identical uplink detection reference signal.
As above the step A described in all schemes, base station are configured required for each terminal transmission uplink detection reference signal
Parameter also includes：The frequency domain parameter needed for reference signal is sent, specifically includes the sub-band number M of uplink detection bandwidth, each subband
Sub-carriers number K, and it is positive integer that terminal, which sends uplink detection reference signal subcarrier start offset amount k, wherein M, K, k
Nonnegative integer no more than K-1；Uplink detection bandwidth is evenly dividing as M subband, and each subband include K it is equally spaced
Subcarrier；Different terminals under same base station have different starting sub-carrier offset amounts.
As above the step A described in all schemes, base station are configured required for each terminal transmission uplink detection reference signal
Parameter also includes：The uplink detection reference signal initial frame number and send interval that each terminal is sent, send interval with radio frames
For base unit.
As above in all schemes, described step B includes：Terminal is according to the uplink detection that the base station received configures with reference to letter
Number numbering, produce basic reference signal x (i), i=0,1 ..., M-1；The basic reference signal characteristics are that its non-zero circulation moves
Position auto-correlation is 0, and the cross correlation very little between the basic reference signal according to caused by different numberings.
As above in all schemes, described step B includes, and calculates current frame reference siganl sub-carrier offset amount m, wherein m
For the nonnegative integer no more than K.The method of frequency hopping or non-frequency hopping can be selected to determine that the subcarrier of the reference signal of present frame is inclined
Shifting amount.
Calculating the method for current frame reference siganl sub-carrier offset amount as described above includes：If select the side of not frequency hopping
Method, terminal are used as current frame reference siganl sub-carrier offset amount by the use of the starting sub-carrier offset amount that base station configures.
Calculating the method for current frame reference siganl sub-carrier offset amount as described above includes：If select the side of frequency hopping
Method, terminal is according to current frame number, each subband sub-carriers number, the starting sub-carrier offset amount of base station configuration and fixation
Frequency hopping pattern calculates current frame reference siganl sub-carrier offset amount.
As above in all schemes, the method for uplink detection reference signal is produced in described step B to be included：According to described
Basic reference sequences x (i), sub-carrier offset amount m, produces current frame reference siganl y (n), n=0,1 ..., M*K-1.Wherein join
Examine signal y (n) to be characterised by, its length is M*K symbols；Its frequency-region signal Y (n) and basic reference sequences x (i) noted earlier
Frequency domain signal X (i) meet following relationWherein X (i), i=0,
1 ..., M-1, Y (n), n=0,1 ..., M*K-1 are respectively Fast Fourier Transform (FFT) corresponding to x (i), y (n)（FFT）As a result,The maximum integer no more than x is expressed as, mod (A, B) represents A to B modulo operations.
The method of uplink detection reference signal is produced in step B as described above to be included：Cyclic prefix is added to y (n), obtained
To uplink detection reference signal to be sent.
As above in all schemes, described step B includes：Initial frame number that terminal configures according to base station, send interval with
And current frame number, judge whether need to send uplink detection reference signal in present frame
Step B as described above, in the fixation for needing to send the sub-frame of uplink in the radio frames of uplink detection reference signal
Uplink detection reference signal is sent on position.Wherein sending detection reference signal should be big to the interval of the initial time of descending sub frame
In the processing time of uplink detection reference signal measurement and the processing time of generation ascending resource scheduling parameter, and in satisfaction
On the premise of stating condition, ended up as far as possible close to sub-frame of uplink at the time of sending uplink detection reference signal.
According to method proposed by the present invention it can be seen from the description of above-mentioned technical proposal, each terminal is in full frequency band
Upper transmission detection reference signal, solves the incomplete problem of detective bandwidth.The starting sub-carrier offset amount of different terminals is different,
And subcarrier spacing is identical, therefore completely orthogonal when on frequency domain, solve mutual between the terminal under same base station
Interference.Uplink detection reference signal signal is always sent in the position of the ending close to sub-frame of uplink, solves up channel letter
The problem of breath measures not in time.
Embodiment
The present invention proposes a kind of method of uplink detection reference signal, and this method can be used for using orthogonal frequency up
Divide multiplexing multi-access mode（OFDMA）Or single carrier frequency division multiplexing multi-access mode（SC-FDMA）TDD wireless communication systems in, it is auxiliary
Help base station to complete the measurement of each terminal uplink channel quality, optimize the scheduling scheme of terminal.With reference to specific implementation
Example is described further to technical scheme of the present invention.
Using system bandwidth as 4MHz, exemplified by character rate is 3.584MHz TDD wireless communication system.System bandwidth is equal
It is even to be divided into M=7 subband, a width of 512KHz of band of each subband.It is K=32 subcarrier by each sub-band division, each
Subcarrier at intervals of 16KHz.
Basic reference signal is from the ZC that length is 7（Zadoff-Chu) sequence, the ZC sequences that numbering is p can be expressed as
I=0,1 ..., 6
Wherein p=1,2 ..., 6.ZC sequences meet that non-zero cyclic shift auto-correlation is mutual for the ZC sequences of 0 and different numberings
The feature of related very little.Define the numbering that p is corresponding basic reference signal.
Each base station selects the numbering of a basic reference signal according to the identity information of this base station.It is all available basic
Reference signal number is 6.Generally the number of base stations of adjacent base station is no more than 6 two-by-two, so according to certain mapping rule
It can ensure that different basic reference signals is selected in adjacent base station.
Assuming that the basic reference signal that certain base station selected numbering is 1, the basic reference signal can be expressed as：
I=0,1 ..., 6
Corresponding frequency-region signal is：
X (i)=FFT (x (i)), i=0,1 ..., 6
Wherein FFT (x) represents to carry out FFT to sequence x.
End side sends uplink detection reference signal subcarrier start offset amount k and current frame number Fn situation obtaining
Under, current frame reference siganl sub-carrier offset amount m can be calculated according to following criterion：
M=mod (Fn+k, K)
Mod (A, B) represents A to B modulo operations.
Terminal produces present frame after current frame reference siganl sub-carrier offset amount m is calculated, according to following steps
Reference signal：
First, in the subcarrier that the frequency-region signal of basic reference signal is mapped to whole frequency band according to following rule, obtain
Present frame frequency domain reference signal signal Y (n), n=0,1 ..., 223：
Then, frequency-region signal Y (n), n=0,1 ..., 223 are subjected to IFFT conversion, obtain current frame reference siganl y
(n), n=0,1 ..., 223：
Y (n)=IFFT (Y (n)), n=0,1 ..., 223
Finally, current frame reference siganl y (n) additions cyclic prefix forms uplink detection reference signal caused by will be above-mentioned.
Base station configurating terminal sends the frame number of uplink detection reference signal and sent and is spaced, such as configures certain terminal from t frames
Start, uplink detection reference signal is sent at intervals of 1, then for terminal in t, t+1, t+2 ..., frame sends uplink detection with reference to letter
Number, until base station configurating terminal stops sending or changing sending mode.
End side, in requisition for the radio frames for sending uplink detection reference signal, up spy is sent at sub-frame of uplink end in phase
Survey reference signal.
The invention is not limited in above-mentioned embodiment, the present invention can have various modifications and substitutions forms, detailed
Describe in detail it is bright in some specific embodiments be intended only as example and stated.It should be understood that these detailed descriptions are in no way intended to
Limit the present invention on disclosed concrete form, on the contrary, the present invention should be included in scope as defined in the claims
Whole modification, equivalents and alternative forms.
Claims (8)
- A kind of 1. method that uplink detection reference signal is sent in TDD wireless communication systems, it is characterised in that：This method bag Include：Step A：As the parameter needed for base station selected terminal sends uplink detection reference signal, and by parameter configuration to terminal；Step B：Terminal produces uplink detection reference signal according to the parameter received, and on the fixed position of sub-frame of uplink Send the uplink detection reference signal；Parameter needed for terminal transmission uplink detection reference signal includes wherein described in step A：Send needed for the reference signal Frequency domain parameter, specifically includes sub-band number M, each subband sub-carriers number K of uplink detection bandwidth, and terminal send it is up Subcarrier start offset the amount k, wherein M, K of detection reference signal are positive integer, and k is the nonnegative integer no more than K-1；Up spy Measuring tape is wide to be evenly dividing as M subband, and each subband includes K equally spaced subcarriers；Difference under same base station Terminal has different subcarrier start offset amounts；The method of terminal generation uplink detection reference signal includes wherein described in step B：The uplink detection reference signal that terminal configures according to the base station that receives is numbered, and produces basic reference signal x (i), i=0, 1 ..., M-1, M be uplink detection bandwidth sub-band number；The basic reference signal characteristics are, its non-zero cyclic shift auto-correlation For 0, and the cross correlation very little between the basic reference signal according to caused by different numberings；It is the nonnegative integer no more than K to calculate present frame uplink detection reference signal sub-carrier offset amount m, wherein m, and K is each Subband sub-carriers number；According to described basic reference signal x (i), present frame uplink detection reference signal sub-carrier offset amount m, present frame is produced The uplink detection reference signal that reference signal y (n), n=0,1 ..., M*K-1, wherein terminal configure according to the base station received is compiled Number, produce the basic reference signal x (i), i=0,1 ..., sub-band number that M-1, M are uplink detection bandwidth；This refers to letter substantially Number it is characterised by, its non-zero cyclic shift auto-correlation is 0, and mutual between the basic reference signal according to caused by different numberings Correlation very little；The current frame reference siganl y (n) is that its length is M*K symbols, and K is each subband sub-carriers number；Its Frequency-region signal Y (n) and the basic reference sequences x (i) frequency domain signal X (i) meet following relationWherein X (i), i=0,1 ..., M-1, Y (n), n=0,1 ..., M* K-1 is respectively Fast Fourier Transform (FFT) (FFT) result corresponding to x (i), y (n),The maximum integer no more than x is expressed as, Mod (A, B) represents A to B modulo operations.
- 2. the method as described in claim 1, it is characterised in that terminal sends uplink detection reference signal wherein described in step A Required parameter includes：The uplink detection reference signal that this base station selects according to identity information is numbered, and wherein adjacent base station selects not Same uplink detection reference signal numbering, all terminals of same base station are numbered using identical uplink detection reference signal.
- 3. the method as described in claim 1, it is characterised in that terminal sends uplink detection reference signal wherein described in step A Required parameter includes uplink detection reference signal initial frame number and the transmission interval that each terminal is sent, and sends interval with wireless Frame is base unit.
- 4. the method as described in any one of claims 1 to 3, it is characterised in that the method for selection frequency hopping or non-frequency hopping determines to work as The sub-carrier offset amount of the reference signal of previous frame.
- 5. method as claimed in claim 4, it is characterised in that：If selecting the method for not frequency hopping, terminal is configured with base station Subcarrier start offset amount as current frame reference siganl sub-carrier offset amount,If selecting the method for frequency hopping, the starting that terminal configures according to current frame number, each subband sub-carriers number, base station is sub Carrier shift amount and the frequency hopping pattern of fixation calculate current frame reference siganl sub-carrier offset amount.
- 6. method as claimed in claim 5, it is characterised in that uplink detection reference signal is produced wherein in step step B Method includes：Cyclic prefix is added to y (n), obtains uplink detection reference signal to be sent.
- 7. the method as described in any one of claims 1 to 3, it is characterised in that the method wherein described in step B includes：Terminal Initial frame number, transmission interval and the current frame number configured according to base station, judges whether need to send up spy in present frame Survey reference signal.
- 8. method as claimed in claim 7, it is characterised in that the method wherein described in step B includes：It is up needing to send Uplink detection reference signal is sent on the fixed position of sub-frame of uplink in the radio frames of detection reference signal, wherein sending up The interval of detection reference signal to the initial time of descending sub frame should be greater than uplink detection reference signal measurement processing time and The processing time of ascending resource scheduling parameter is produced, and on the premise of above-mentioned condition is met, sends uplink detection with reference to letter Number at the time of as far as possible close to sub-frame of uplink end up.
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| CN105025579B (en) * | 2015-07-23 | 2018-08-14 | 京信通信系统（中国）有限公司 | A kind of SRS dispatching methods and device |
| CN106455094B (en) * | 2015-08-13 | 2020-01-07 | 中国移动通信集团公司 | Transmission method of sounding reference signal, network side equipment and user equipment |
| CN106877984B (en) * | 2015-12-10 | 2019-08-20 | 上海朗帛通信技术有限公司 | A kind of method and apparatus in narrowband wireless transmission |
| CN107733601B (en) | 2016-08-12 | 2020-11-10 | 电信科学技术研究院 | Uplink SRS sending method, terminal and network side equipment |
| WO2018058855A1 (en) * | 2016-09-30 | 2018-04-05 | 华为技术有限公司 | Data transmission method, device and system |
| WO2018076361A1 (en) * | 2016-10-31 | 2018-05-03 | 华为技术有限公司 | Uplink transmission method, terminal device and access network device |
| CN108365937B (en) * | 2017-01-26 | 2020-05-15 | 中国移动通信有限公司研究院 | Transmission method, transmission system, base station and terminal of reference signal |
| CN110417523B (en) * | 2018-04-28 | 2022-05-31 | 上海华为技术有限公司 | Channel estimation method and device |
| CN109413573B (en) * | 2018-11-23 | 2020-09-04 | 武汉虹信通信技术有限责任公司 | Internet of things terminal positioning method and device |
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| RU2351073C2 (en) * | 2004-06-07 | 2009-03-27 | Самсунг Электроникс Ко., Лтд. | Handover system in bwa communication system and corresponding method |
| CN101286762B (en) * | 2007-04-10 | 2013-08-28 | 华为技术有限公司 | Method for transmitting sounding pilot and transmitting device |
| CN101651469B (en) * | 2008-08-15 | 2013-07-24 | 三星电子株式会社 | Frequency hopping method for sending uplink monitoring reference mark in LET system |
| KR101319903B1 (en) * | 2009-09-21 | 2013-10-18 | 엘지전자 주식회사 | Method for transmitting a sounding reference signal in a wireless communication system, and apparatus for same |
| CN102761968B (en) * | 2011-04-27 | 2017-03-01 | 艾利森电话股份有限公司 | The detection reference signal uplink resource allocating method of multi-user installation and base station |
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