CN106656370A - Signal to interference and noise ratio measuring method for LTE-A (Long Term Evolution-Advanced) system - Google Patents

Abstract

The invention provides a signal to interference and noise ratio measuring method for an LTE-A (Long Term Evolution-Advanced) system. The method comprises the following steps: processing a PUCCH (Physical Uplink Control Channel) received signal at a receiving end to obtain a balanced soft symbol, and performing CQI (Channel Quality Indicator) decoding or HARQ (Hybrid Automatic Repeat Request) decision; performing symbol reconstruction with a decoded result; and calculating a signal to interference and noise ratio according to the reconstructed symbol and the balanced soft symbol. The technical scheme is suitable for all PUCCH formats, and the problems that signal to interference and noise ratio estimation is limited to the PUCCH formats and the estimation is inaccurate in the prior art are solved. Through adoption of the signal to interference and noise ratio measuring method, the signal to interference and noise ratio of a PUCCH in the LTE-A system can be measured effectively, and an effective reference value is provided for uplink power control and adjustment, thereby enhancing the performance of an uplink receiving end.

Description

A kind of Signal to Interference plus Noise Ratio measuring method for lte-a system

Technical field

The present invention relates to wireless communication technology field, more particularly it relates to a kind of be applied to LTE-Advanced The measuring method of the Signal to Interference plus Noise Ratio of system.

Background technology

Advanced Long Term Evolution LTE-Advanced (Long Term Evolution-Advanced) is on the basis of LTE Smooth evolution, abbreviation LTE-A.LTE-A enhances the spectral flexibility of LTE on the basis of LTE by carrier aggregation, further Multi-antenna transmitting transmission scheme is extended, the support to relaying is introduced, and there is provided to the lower presence of intercell interference of heterogeneous network deployment Improvement in terms of coordination, is greatly improved transmission data speed, cell mean spectral efficiency, the cell boarder of wireless communication system User performance, using the teaching of the invention it is possible to provide higher-quality mobile service.

In lte-a system, PUCCH (physical uplink control channel, Physical Uplink Control Channel) For sending ascending control information, the shared channel in lte-a system can be received and dispatched normally with important effect.LTE systems In system, PUCCH supports that form 1/1a/1b and form 2/2a/2b, form 1 are used for UE and send dispatch request, form to eNodeB 1a is used for HARQ (Hybrid Automatic Repeat reQuest, the mixed automatic retransfer that UE sends 1 bit to eNodeB Request) ACK (Acknowledge, correct response) or NACK (Non-Acknowledge, wrong responses), form 1b be used for UE The HARQ ACK or NACK of 2 bits are sent to eNodeB；Form 2,2a, 2b, CQI (Channel are sent for UE to eNodeB Quality Indicator, channel quality is indicated) and HARQ ACK or NACK.With LTE system Comparatively speaking, LTE-A systems System has increased a kind of form, i.e. form 3 newly, for transmitting most 10 bit HARQ information under multi-carrier aggregation scene.

Lte-a system is allowed in a subframe using multiple time-frequency RB (Resource Block, Resource Block) to cell Interior multiple UE distribute PUCCH to transmit ACK/NACK, CQI or SR message, wherein, a PUCCH is used in a subframe One RB, RB 2 time slots of correspondence, each time slot has 7 symbols (correspondence general cyclic prefix) or 6 symbols, and (correspondence expands Exhibition Cyclic Prefix), each symbol has 12 subcarriers.

Signal to Interference plus Noise Ratio (Signal to Interference plus Noise Ratio, SINR) estimates it is that PUCCH is received End need realize a critical function, be reflect active user's channel quality a measurement index, and its can be used for it is up Receive signal Effective judgement and the target SINR reference value as uplink power control.Accurate PUCCH SINR estimation sides Case can ensure that the adjustment of user's effective power and receiving end signal Effective judgement etc..PUCCH SINR estimate in lte-a system The purpose of meter can exactly reflect current channel conditions, there is provided to effective reference value of uplink power control adjustment, so as to improve Uplink receiving end performance.

In prior art, have various to the scheme that PUCCH SINR estimate, such as according to feedback information ACK/NACK in PUCCH The characteristics of modulation, the modulates information of ACK/NACK thus connects to the I roads (component in the same direction) or Q roads (quadrature component) that correspond to symbol Receiving end can calculate SNR according to the real part of the soft bit symbol for obtaining and imaginary part, but this scheme estimates SNR and the non-critical meaning for True SNR in justice, brings difficulty, and this scheme to be only applicable to carry HARQ letters to the uplink power control of PUCCH The form of breath, is not suitable for the form of this carrying CQI information of form 2.

Method also is also the data division and pilot tone letter received in signal for form 1/1a/1b under common prefix Number part, is utilized respectively code channel the allocated in 36 code channels and carrys out power estimator signal, using remaining without the code channel for distributing To estimate noise-plus-interference power.This method used in UE do not exist when it is inclined in the case of it is relatively more accurate.Once in the presence of UE partially, then The transmit power of the UE can be leaked on adjacent code channel, so that the noise-plus-interference power estimated is bigger than normal, it is final to cause to estimate The signal to noise ratio of meter is less than normal, increased the probability of the DTX for judging by accident ACK or NACK, have impact on eNodeB to corresponding upload control Information makes correct response, and then reduces systematic function.

The content of the invention

It is an object of the present invention to provide a kind of Signal to Interference plus Noise Ratio measuring method of PUCCH, is done with the letter for improving lte-a system Make an uproar than the accuracy for measuring.

The technical solution adopted in the present invention provides a kind of Signal to Interference plus Noise Ratio measuring method for lte-a system, including with Lower step,

Step one, receiving signal to PUCCH carries out receiving terminal process, the soft symbol after being equalized, if PUCCH is received The soft symbol that obtains after data balancing of signal be d_n, n=0,1 ..., N-1, N be a sub- frame in data symbol Number；CQI decodings or HARQ judgements are carried out in QPSK demodulation and after descrambling, the result after being decoded is a₀,a₁,a₂, a₃,...,a_A-1, A is the bit number after decoding；

Step 2, with result a after decoding₀,a₁,a₂,a₃,...,a_A-1Carry out symbol reconstruct and obtain d_hard_n；

For PUCCH format 1/1a/1b, carrying out the process of symbol reconstruct is, to 1 bit that obtains after decoded or 2 ratios Special HARQ information first carries out channel coding, and ACK is encoded into into binary bits " 1 ", and NACK is encoded into binary bits " 0 ", right Result after coding carries out obtaining reconstruction signal d_hard after BPSK modulation_n, n=1；

For PUCCH format 2/2a/2b, carrying out the process of symbol reconstruct is, to result a obtained after decoded₀,a₁, a₂,a₃,...,a_A-1, using the coded system of (20, A) carries out channel coding, and the bit sequence after coding is b₀,b₁,b₂, b₃,...,b_B-1, B=20, by the result after channel coding scrambled respectively and QPSK modulation, obtain reconstruction signal d_hard_n, N=0,1 ..., 9；

For PUCCH format 3, carrying out the process of symbol reconstruct is, to result a obtained after decoded₀,a₁,a₂, a₃,...,a_A-1, using the coded system of (32, A) carries out channel coding, and the bit sequence after coding is b₀,b₁,b₂,b₃,..., b_B-1, B=48, the result after channel coding is carried out respectively scrambling and QPSK is modulated, and obtains reconstruction signal d_hard_n, n=0, 1,...,11；

Step 3, according to the gained soft symbol d after data balancing_nWith symbol d_hard after reconstruct_n, obtain signal power P_sFor

Interference and noise power are as follows,

Try to achieve Signal to Interference plus Noise Ratio as follows,

Wherein, N is the data symbol number of a sub- frame in, for form 1/1a/1b, N=1；For form 2/2a/ 2b, N=10；For form 3, N=24.

And, when lte-a system has the antenna of more than 2, signal power P of each UE to obtaining under all antennas_s Merge, jamming power P of the PUCCH to obtaining under all antennas_IMerge, calculate the signal work(of each UE after merging Rate P_sWith merge after PUCCH jamming power P_IRatio, obtain the signal to noise ratio of each UE.

The present invention carries out symbol reconstruct according to the characteristics of the PUCCH of lte-a system to CQI the or HARQ bits after decoding, Using the symbol after reconstruct with it is balanced after soft symbol feature calculating Signal to Interference plus Noise Ratio, it is adaptable to PUCCH all formats, solve Signal to Interference plus Noise Ratio is estimated to be confined to PUCCH format and the inaccurate problem of estimation in prior art.Using the present invention, can effectively survey The Signal to Interference plus Noise Ratio of PUCCH in amount lte-a system, there is provided up so as to improve to effective reference value of uplink power control adjustment Receiving terminal performance, with important market value.

Description of the drawings

Fig. 1 is the flow chart of the Signal to Interference plus Noise Ratio measuring method preferred embodiment of PUCCH of the present invention；

Fig. 2 is the planisphere of embodiment of the present invention reconstruction signal and receiving terminal signal after equalization；

Fig. 3 is the default SINR of the embodiment of the present invention and measurement SINR simulation curve figures.

Specific embodiment

In order that those skilled in the art more fully understand technical solution of the present invention, and make above-mentioned purpose of the present invention, feature and Advantage can become apparent from it is understandable, technical solution of the present invention is described in further detail with reference to the accompanying drawings and examples.

A kind of possessive case of Signal to Interference plus Noise Ratio measuring method PUCCH suitable for lte-a system of PUCCH that the present invention is provided Formula, including form 1/1a/1b, form 2/2a/2b and form 3.Referring to Fig. 1, PUCCH is configured to form 2 in embodiment, up System bandwidth is 10MHz, 2 reception antennas, and for every antenna, each OFDM symbol PUCCH takes 12 subcarriers.Implement The configuration that example is adopted is as follows：

The embodiment of table 1 is configured

Bandwidth	10M
		Antenna configuration	1*2
User's number	1
		PUCCH format	Form 2
CQI bit sequences	[1 1 1 1]
		Cyclic shift interval	2
Ncs_1	0
		CP types	Common CP
Channel model	EVA5
		Target SINR	0dB、3dB、6dB、9dB、12dB、15dB、18dB、20dB

Step one, receiving signal to PUCCH carries out receiving terminal process, the soft symbol after being equalized, what PUCCH was received The soft symbol that signal is obtained after data balancing is d_n(n=0,1 ..., N-1), and carry out in QPSK demodulation and after descrambling CQI is decoded or HARQ judgements, and the result after being decoded is a₀,a₁,a₂,a₃,...,a_A-1, A is the bit number after decoding；

In embodiment,

For form 2, the soft symbol that the signal that PUCCH is received is obtained after equilibrium is d_n, n=0,1 ..., 9, always Totally 10 symbols, N=10；After QPSK is demodulated and descrambled, CQI decodings are carried out, bit is a after being decoded₀,a₁,a₂, a₃,...,a_A-1, A be decoding after bit number, A=4 in embodiment；Data balancing, QPSK demodulation and descrambling can adopt existing Technology, it will not go into details for the present invention.

Step 2, with result a after decoding₀,a₁,a₂,a₃,...,a_A-1(CQI bits or HARQ bits after decoding) enters The reconstruct of row symbol obtains d_hard_n

Preferably for PUCCH format 1/1a/1b, carrying out the process of symbol reconstruct is：To 1 ratio obtained after decoded Special or 2 bit HARQ information first carry out channel coding, and the channel coding of format 1/1a/1b is that ACK is encoded into into binary system ratio Special " 1 ", NACK is encoded into binary bits " 0 ", BPSK (Binary Phase Shift is carried out to the result after coding Keying, binary phase shift keying) modulation after obtain reconstruction signal d_hard_n, n=1.

Preferably for PUCCH format 2/2a/2b, carrying out the process of symbol reconstruct is：To the CQI obtained after decoded Bit result a₀,a₁,a₂,a₃,...,a_A-1, A is the bit number (1≤A≤13) after decoding, and the coded system for using (20, A) is entered Row channel coding, the bit sequence after coding is b₀,b₁,b₂,b₃,...,b_B-1, B=20 carries out the result after channel coding Respectively scrambling and QPSK modulation, obtain reconstruction signal d_hard_n, n=0,1 ..., 9.

Preferably for PUCCH format 3, carrying out the process of symbol reconstruct is：To the HARQ bits obtained after decoded a₀,a₁,a₂,a₃,...,a_A-1, A is the bit number (4≤A≤10) after decoding, and using the coded system of (32, A) carries out channel volume Code, the bit sequence after coding is b₀,b₁,b₂,b₃,...,b_B-1, B=48 respectively scrambled the result after channel coding With QPSK modulation, reconstruction signal d_hard is obtained_n, n=0,1 ..., 11.

In embodiment, for PUCCH format 2, restructuring procedure is：

CQI bit a after 1.1 pairs of decodings₀,a₁,a₂,a₃,...,a_A-1, using the coded system of (20, A) carries out channel Coding, wherein the basic sequence of (20, A) coded system is as shown in table 2, the bit after coding is expressed as b₀,b₁,b₂,b₃,..., b_B-1, thenThen i=0,1,2 ..., B-1.A=4, B=20 in the present embodiment, then according to M_i,0 To M_i,3Symbol after channel coding is b (0) ..., b (19).M_i,jRepresent the element of the i-th row of basic sequence jth row.

The basic sequence of table 2 (20, A) coded system

Signal b (0) after 1.2 pairs of channel codings ..., b (19) carries out scrambling and obtainsScrambler c (i) is specified by the agreements of 3GPP 36.211, be will not be described here.

Signal after 1.3 pairs of scramblingsQPSK modulation is carried out, the signal d (0) ..., d after being modulated (9), that is, reconstruct after signal d_hard_n, n=0,1 ..., 9.

Fig. 2 show in channel added SINR when being 0dB, reconstruction signal d_hard_nWith receiving terminal signal after equalization d_nStar Seat figure, wherein the constellation point represented by ' o ' is signal after equalization, the constellation point represented by ' ☆ ' is reconstruction signal.As can be seen that Signal after reconstruct is standard constellation point, is clean signal, and the soft symbol after equilibrium is then more at random, is utilized therebetween Euclidean distance can measure SINR value.

Step 3, by symbol d_hard after reconstruct_nIt is considered clean signal, obtains accordingly and after data balancing Soft symbol d_nObtain signal power P_sForInterference and noise power are thenTry to achieve Signal to Interference plus Noise RatioWherein N is a sub- frame in Data symbol number, for form 1/1a/1b, N=1；For form 2/2a/2b, N=10；For form 3, N=24.It is right In the present embodiment, N=10.

When being embodied as, method provided by the present invention can realize automatic running using software mode.

Preferably, above-mentioned Signal to Interference plus Noise Ratio measuring method, for having in system during the antenna of more than 2, under all antennas Signal power P of each UE for obtaining_sMerge；Jamming power P of the PUCCH to obtaining under all antennas_IMerge；With And signal power P of each UE after calculating merging_sWith merge after PUCCH jamming power P_IRatio, obtain the noise of each UE Than.

2 reception antennas in for the present embodiment, then signal power P of the UE to obtaining under 2 reception antennas_sCarry out Merge, jamming power P of the PUCCH to obtaining under 2 antennas_IMerge, then calculate signal power P of the UE after merging_s With merge after PUCCH jamming power P_IRatio, obtain the Signal to Interference plus Noise Ratio of the UE.

Referring to Fig. 3, the scheme provided with the embodiment of the present invention, the curve of the SINR and default SINR of measurement is obtained, As can be seen that in default 0～20dB SINR, with the true SINR and default estimation SINR curve bases of present invention measurement Originally it is consistent, it is seen that the technique effect of the present invention.

Examples detailed above is not limited for the present invention preferably embodiment, but embodiments of the present invention by above-described embodiment System, other any Spirit Essences and changes, modification, replacement made under principle for not running counter to the present invention, combine, simplification all should For equivalent substitute mode, it is included within protection scope of the present invention.

Claims (2)

1. a kind of Signal to Interference plus Noise Ratio measuring method for lte-a system, it is characterised in that：Comprise the following steps,

Step one, receiving signal to PUCCH carries out receiving terminal process, the soft symbol after being equalized, if the letter that PUCCH is received Number soft symbol obtained after data balancing is d_n, n=0,1 ..., N-1, N be a sub- frame in data symbol number； CQI decodings or HARQ judgements are carried out in QPSK demodulation and after descrambling, the result after being decoded is a₀,a₁,a₂,a₃,..., a_A-1, A is the bit number after decoding；

Step 2, with result a after decoding₀,a₁,a₂,a₃,...,a_A-1Carry out symbol reconstruct and obtain d_hard_n；

For PUCCH format 1/1a/1b, carrying out the process of symbol reconstruct is, to 1 bit that obtains after decoded or 2 bits HARQ information first carries out channel coding, and ACK is encoded into into binary bits " 1 ", and NACK is encoded into binary bits " 0 ", to compiling Result after code carries out obtaining reconstruction signal d_hard after BPSK modulation_n, n=1；

For PUCCH format 2/2a/2b, carrying out the process of symbol reconstruct is, to result a obtained after decoded₀,a₁,a₂, a₃,...,a_A-1, using the coded system of (20, A) carries out channel coding, and the bit sequence after coding is b₀,b₁,b₂,b₃,..., b_B-1, B=20, by the result after channel coding scrambled respectively and QPSK modulation, obtain reconstruction signal d_hard_n, n=0, 1,...,9；

For PUCCH format 3, carrying out the process of symbol reconstruct is, to result a obtained after decoded₀,a₁,a₂,a₃,..., a_A-1, using the coded system of (32, A) carries out channel coding, and the bit sequence after coding is b₀,b₁,b₂,b₃,...,b_B-1, B= 48, the result after channel coding is carried out respectively scrambling and QPSK modulation, obtain reconstruction signal d_hard_n, n=0,1 ..., 11；

Step 3, according to the gained soft symbol d after data balancing_nWith symbol d_hard after reconstruct_n, obtain signal power P_sFor

Interference and noise power are as follows,

$P_I=\underset{n=0}{\overset{N-1}{\Σ}}\left|\right|d_n-d\_{\mathrm{hard}}_n|{|}^2,$

Try to achieve Signal to Interference plus Noise Ratio as follows,

$SINR=\frac{P_s}{P_I}=\frac{\underset{n=0}{\overset{N-1}{\Σ}}\left|\right|d\_{\mathrm{hard}}_n|{|}^2}{\underset{n=0}{\overset{N-1}{\Σ}}\left|\right|d_n-d\_{\mathrm{hard}}_n|{|}^2}$

Wherein, N is the data symbol number of a sub- frame in, for form 1/1a/1b, N=1；For form 2/2a/2b, N= 10；For form 3, N=24.

2. the Signal to Interference plus Noise Ratio measuring method of lte-a system is used for according to claim 1, it is characterised in that：In lte-a system When having the antenna of more than 2, signal power P of each UE to obtaining under all antennas_sMerge, to obtaining under all antennas PUCCH jamming power P_IMerge, calculate signal power P of each UE after merging_sWith merge after PUCCH interference Power P_IRatio, obtain the signal to noise ratio of each UE.