CN101192875B - Uplink orthogonal reference signal distribution method for universal land wireless access system - Google Patents

Uplink orthogonal reference signal distribution method for universal land wireless access system Download PDF

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CN101192875B
CN101192875B CN 200610118789 CN200610118789A CN101192875B CN 101192875 B CN101192875 B CN 101192875B CN 200610118789 CN200610118789 CN 200610118789 CN 200610118789 A CN200610118789 A CN 200610118789A CN 101192875 B CN101192875 B CN 101192875B
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cyclic shift
group
uplink
access system
reference signal
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CN101192875A (en
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周斌
王海峰
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上海无线通信研究中心
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Abstract

The invention relates to an uplink orthogonal reference signal allocation method used for universal land wireless access system, which comprises the following steps: the number of the groups of the user terminals to be grouped in the base station scope of the universal land wireless access system is first set and the cyclic shift interval base is set according to the uplink channel length of the universal land wireless access system; then the cyclic shift intervals of various groups are determined according to the number of the groups, the delay extension values of the uplink channel of various user terminals the base station obtains beforehand in the scope and the cyclic shift interval base; then the maximum number of the user terminals contained in various groups is calculated accordingto the signal length of the initial constant module zero autocorrelation sequence of the universal land wireless access system; finally the cyclic shift is applied to the initial constant module zeroautocorrelation sequence for the corresponding times according to the cyclic shift intervals of various groups and the maximum number of the user terminals contained in various groups so as to ensurethat the corresponding user terminals contained in various groups respectively acquire the uplink orthogonal reference signal. The invention can ensure that the communication system supports more orthogonal pilot channels.

Description

用于通用陆地无线接入系统的上行正交参考信号分配方法 An uplink orthogonal reference signal allocation method for Universal Terrestrial Radio Access System

技术领域 FIELD

[0001] 本发明涉及一种上行正交参考信号分配方法,特别涉及一种用于通用陆地无线接入系统的上行正交参考信号分配方法。 [0001] The present invention relates to a method for allocating orthogonal uplink reference signal, and more particularly to an uplink orthogonal reference signal allocation method for universal terrestrial radio access system is provided.

背景技术 Background technique

[0002] 目前,在演进的通用陆地无线接入系统(E-UTRA)中,基站(Node B)是通过对接收到的上行参考信号进行分析以确定基于信道信息的调度方法和时分双工(TDD)系统中下行传输分集(beamforming)方法,由于E-UTRA标准化工作组已经将具有循环前缀的单载波频分复用系统(SC-FDMA)作为上行传输的调制方法,而在SC-FDMA中,上行传输子帧是由若干个经过离散傅立叶变换(DFT)扩频的正交频分复用(OFDM)符号组成的,因此,E-UTRA标准化工作组确定在上行传输子帧中采用两个短的DFT扩频OFDM符号(SBl和SB》来传输上行参考信号(Pilot),并将恒模零自相关(CAZAC)序列确定为上行参考信号。 [0002] At present, Evolved Universal Terrestrial Radio Access System (E-UTRA), the base station (Node B) is analyzed by the received uplink reference signal to determine a scheduling method and a time division duplex based on the channel information ( TDD) system, downlink transmit diversity (Beamforming) method, the E-UTRA standardization working group has a single carrier cyclic prefix frequency division multiplexing system (SC-FDMA) as the uplink transmission modulation method, whereas in SC-FDMA , uplink transmission sub-frame is composed of several through discrete Fourier transform (DFT) spread orthogonal frequency division multiplexing (OFDM) symbols, and therefore, E-UTRA standardization working group is determined using two uplink transmission subframe DFT-spread OFDM symbols short (and SBl SB "to transmit uplink reference signal (Pilot), and constant modulus zero autocorrelation (the CAZAC) sequence determination of the uplink reference signal.

[0003] 通常,恒模零自相关(CAZAC)序列包括Zadoff-Chu序列和GCL序列,其中Zadoff-Chu序列是GCL序列的一个特例。 [0003] Generally, a constant modulus zero autocorrelation (the CAZAC) sequence comprises a Zadoff-Chu sequence and GCL sequence, wherein the Zadoff-Chu sequence is a special case of the GCL sequence. 在一定带宽的SC-FDAM通信系统中,上行参考信号可以占据的子载波个数是特定的,因此所需的参考信号(CAZAC序列)的长度也是特定的,而特定长度的CAZAC序列可以通过如下方法获得:首先设定所需的序列长度为NP,其中NG为大于NP的最小素数,然后产生长度为NG的CAZAC序列以保证CAZAC序列的最佳特性, 再将长度为NG的CAZAC序列截短以产生长度为NP的参考信号,最后将此参考信号应用到OFDM调制(IFFT)中相应的NP个子载波上进行调制传输,从而形成子帧中的短符号SBl或者SB2 ο In certain bandwidth of SC-FDAM communication system, the number of sub-carriers occupied by the uplink reference signal may be a specific length of the reference signal (CAZAC sequence) is thus required specific, the CAZAC sequence length can be specified by method obtained: first, set the required sequence length of NP, where NG is a prime number greater than the minimum NP, and then generate CAZAC sequences of length NG to ensure optimum characteristics of CAZAC sequences, the CAZAC sequence length and then truncated NG NP length to produce a reference signal, and finally transmitted on this modulated reference signal is applied to an OFDM modulation (IFFT) in the corresponding NP subcarriers, thereby forming a short symbols SBl subframe or SB2 ο

[0004] 由于在当前E-UTRA标准化中,提供给多个用户(UE)的上行正交导频信道的复用方法包括以下几种:频分复用(FDM)、码分复用(CDM)、混合频分码分复用,其中,在频分复用方法中,通过为每个用户分配不同的正交的用于导频传输的子载波集来产生正交的频分复用参考信号;在码分复用方法中,由于所有的参考信号都占据一段公共的连续的子载波集,因此分配给不同用户的参考信号是通过对同一个CAZAC序列进行不同长度的循环移位产生的,在接收端只需通过对接收到的CDM参考信号和传输的原始CDM参考信号进行循环移位相关即可获得多个用户的时域信道响应估计值,由此可见,从可支持的最大正交序列个数以及小区边缘干扰随机化的角度来说,码分复用的方法比频分复用的方法更有优势, 从而是一种很有希望的上行正交导频信道复用方法。 [0004] Since the current E-UTRA standardization, provided to multiple users (UE), an uplink pilot channel orthogonal multiplexing method comprising the following: frequency division multiplexing (FDM), code division multiplexing (CDM ), mixed frequency division multiplexing code division, wherein, in a frequency division multiplexing method, by assigning each user a different pilot set of pilot subcarriers orthogonal transmission to generate orthogonal frequency division multiplexing reference signal; code-division multiplexing method, since all the period of the reference signals occupying a common set of contiguous subcarriers, so different users assigned to the reference cycle signal by a different length to the same CAZAC sequence generated by the shift , correlation can be obtained by cyclically shifting the plurality of users in the original time-domain channel CDM CDM only the reference signal input terminal and the reference signal received by the transmission response estimate, it follows from the positive maximum supportable the number of orthogonal sequence and a cell edge interference randomization angle, the code division multiplexing method than the method of frequency division multiplexing advantage thereby is a promising uplink pilot channel orthogonal multiplexing method.

[0005] 参见图1,其示出了在CDM方法中,由同一个初始导频CAZAC序列的不同循环位移而产生多个正交序列的过程。 [0005] Referring to Figure 1, which shows a process in the CDM method, the initial turn by the same frequency cyclic shifts of different CAZAC sequence to generate a plurality of orthogonal sequences. 设初始导频(CAZAC#1)序列为c,对c循环移位Δ产生的序列设为S, (c),由于序列c具有零循环自相关特性,如果(NI) · Δ没有超过序列长度并且Δ大于所有用户(UE)的最大时延扩展,则导频(CAZAC#1)序列分别经过移位位数为O、Δ、 2 Δ……(NI) Δ的移位后得到序列,S. (c),S2. (c). . . Sfrl) Δ (c)保持两两正交。 The initial set of pilot (CAZAC # 1) c sequence, the cyclic shift of [Delta] c is set to produce a sequence S, (c), since the zero-sequence c having a cyclic autocorrelation characteristic, if (NI) · Δ does not exceed the length of the sequence and [Delta] is greater than all the users (UE), the maximum delay spread, the pilots (CAZAC # 1) sequences are shifted through the median of O, Δ, 2 Δ ...... (NI) Δ shift sequences obtained, S . (c), S2. (c)... Sfrl) Δ (c) are orthogonal to each holder. 因此,正交序列4(c),S, (c),S2 ,(^...Sfrl) .(c)可以相应的分别分配给用户UE#1、UE#2、 UE#3……UE#N,作为该等用户的上行参考信号。 Thus, the orthogonal sequence 4 (c), S, (c), S2, (^ ... Sfrl). (C) can be respectively assigned to respective users UE # 1, UE # 2, UE # 3 ...... UE #N, such as the user's uplink reference signal. [0006] 参见图2,其示出了同一辖区中不同用户的上行参考信号产生过程。 [0006] Referring to Figure 2, which shows the same area different users uplink reference signal generation process. 首先,在发射端,CAZAC序列经过循环移位处理后,再经过一个与序列长度等长的离散傅立叶变换(DFT) 后变换到了频域。 First, at the transmitting end, after the CAZAC sequence cyclic shift processing, and then after a long sequence length discrete Fourier transform (DFT) to the converted frequency domain. 由于经过傅立叶变换后W^idoff-Chu/GCL序列仍然是一Ahdoff-Chu/ GCL序列,序列的时域循环移位可以等效为频域的线性相移,因此正交CAZAC序列也可以不经过DFT变换而在频域加入。 Since after the Fourier transform W ^ idoff-Chu / GCL sequences still a Ahdoff-Chu / GCL sequence, the time-domain cyclic shift sequence can be equivalent to a linear phase shift in the frequency domain, the CAZAC sequence may be orthogonal so without DFT transform in the frequency domain is added. 这些具有不同的线性相移的CAZAC序列被直接映射到OFDM调制的相应导频子载波上,进行离散逆傅立叶变换(IFFT)操作并加入载波信号,最后,在并串转换和加入循环前缀操作后,得到的参考信号序列即上行参考信号,可在上行子帧的SBl 或SB2符号位置上传输了,亦即通过射频进行发射。 Respective guide these have different linear phase shifts of the CAZAC sequence is mapped directly to an OFDM modulated frequency subcarriers, discrete inverse Fourier transform (IFFT) operation and added to the carrier signal, and finally, after the parallel-serial conversion and added cyclic prefix operator , i.e. the reference signal sequence to obtain an uplink reference signal, may be transmitted in symbol positions SBl or SB2 on the uplink subframe, i.e. transmission by the radio.

[0007] 基于E-UTRA已经确定的SC-FDMA的系统参数中,短符号(SB)的长度通常为33. 33 μ S。 [0007] SC-FDMA system parameters of the E-UTRA been determined based, short symbols (SB) length typically 33. 33 μ S. 因此,在保证所有经循环移位后得到的序列仍然具有正交性的前提下,在考虑最大信道时延为5 μ s的情况下(TU信道模型),一个CAZAC序列最多能够通过循环移位产生6个正交序列(Floor ((33. 33 μ s短符号长度)/(TU信道长度))=6) Therefore, to ensure that all the cyclically shifted sequence is still obtained under the premise of having orthogonality, in consideration of the maximum channel delay is a 5 μ s (TU channel model), a CAZAC sequence can be shifted through the up cycle generating orthogonal sequences 6 (Floor ((33. 33 μ s short symbol length) / (TU channel length)) = 6)

[0008] 现有E-UTRA标准化提案通过仿真已获知:在只有一个小区只使用一个初始CAZAC 序列且复用的用户数不超过4飞时,CDM方法可以获得与FDM方法相似的性能,如果要是支持的用户数超过前述范围,就需要采用第二个初始CAZAC序列,这样会带来性能上的显著 [0008] The conventional E-UTRA standardization proposal has been known through simulation: a cell only when using only one initial CAZAC sequence and the number of multiplexed users fly no more than 4, the CDM method can be obtained with properties similar to FDM method, If we the number of users supported than the above range, the second option requires the initial CAZAC sequences, this will result in significant performance on

T^ ο T ^ ο

[0009] 正因为一个小区只能使用一个初始CAZAC序列,并且序列的循环移位间隔必须大于小区内所有用户的最大时延扩展的长度,所以传统CDM方法能够提供的正交导频信道是非常有限的,而在FDM方法中,为了增加正交导频信道的数目,在牺牲一定性能的代价下可采用子帧内两个短符号间的交错梳状导频分配技术,即使如此,采用两个短符号也只能最大同时支持12个用户的参考信号传输。 [0009] Because of a cell use only one initial CAZAC sequence and the cyclic shift interval must be greater than the sequence length of the extension maximum delay for all users in the cell, the orthogonal pilot CDM conventional method can provide a pilot channel is limited, but in the FDM method, the pilot channel in order to increase the number of orthogonal pilot channels, at the cost of sacrificing the performance of certain sub-frame can be staggered between the two guide comb symbols in the frequency allocation techniques shorter, even so, the use of two short symbols can only support a maximum reference signal 12 transmitted user. 因此,在上行子帧的两个短符号位置上同时传输宽带参考信号的用户数量是极为有限的,若要在上行传输中使用基于信道信息的调度以提高系统吞吐量,需要基站(Node B)调度的用户会非常多,现有各类技术方法难以满足用户的需求。 Thus, two short symbol uplink subframe positions on the number of simultaneous users transmit wideband reference signal is extremely limited, the channel to use based on the scheduling information to improve the system throughput in uplink transmission, the base station needs (Node B) multi-user scheduling will be very, existing variety of technical methods can not meet the needs of users.

[0010] 综上所述,由于被复用的用户需要在相同的短符号块内同时传输宽带的上行导频信号,但现有码分复用的方法受到CAZAC序列长度和循环时移长度的限制,其所能支持的最大用户数目是非常有限的,同时,为避免小区内的干扰,循环时移的长度必须大于小区内所有用户的最大时延扩展,进一步导致现有码分复用方法所能支持的最大用户端数目减少,无法满足上行基于信道信息调度的需求,如何解决现有技术的缺点实已成为业界亟待解决的技术课题。 [0010] As described above, since the user needs to multiplexed uplink pilot signal transmission of broadband pilot symbols within the same short block, but the conventional method by the code division multiplexing shifted CAZAC sequence length and the cycle length limit, which can support the maximum number of users is limited, while, in order to avoid intra-cell interference, shift the loop must be longer than the maximum delay spread for all users in the cell, resulting in further conventional code division multiplexing method reduce the maximum number of clients that can be supported, unable to meet the uplink channel information based on scheduling needs, how to solve the shortcomings of the prior art has become a real industry technical problem to be solved.

发明内容 SUMMARY

[0011] 本发明的目的在于提供一种用于通用陆地无线接入系统的上行正交参考信号分配方法,以支持更多的正交导频信道,提高通信系统的容量。 [0011] The object of the present invention is to provide an uplink orthogonal reference signal allocation method of a universal terrestrial radio access systems to support more pilot channels orthogonal pilot channels to improve the capacity of the communication system.

[0012] 为了达到上述目的,本发明提供一种用于通用陆地无线接入系统的上行正交参考信号分配方法,其包括步骤:1)设定所述通用陆地无线接入系统的基站辖区内的待分组用户端的分组组数,并根据所述通用陆地无线接入系统的上行信道长度设定循环移位间隔基准;2)根据所述分组组数、所述基站预先获得的其辖区内的各用户端的上行信道时延扩展值及所述循环移位间隔基准确定各组的循环移位间隔;幻根据各小组的循环移位间隔及所述通用陆地无线接入系统的初始恒模零自相关序列的长度值计算各组能包含的最大用户端数目计算各组能包含的最大用户端数目;4)根据各组的循环移位间隔及各组能包含的最大用户端数目将所述初始恒模零自相关序列进行相应次数的循环移位以使各组所包含的相应用户端获得各自的上行正交参考信号。 [0012] To achieve the above object, the present invention provides an uplink orthogonal reference signal allocation method of a universal terrestrial radio access system, comprising the steps of: 1) setting the area within a base station Universal Terrestrial Radio Access System the number of packets to be packets UE groups, and the cyclic shift interval is set according to the uplink reference channel length of the universal terrestrial radio access systems; 2) according to the number of the packet group, obtained in advance of the base station within its jurisdiction each UE uplink channel delay spread value and the reference to determine the cyclic shift interval of cyclic shift interval of each group; magic shift interval and the universal terrestrial radio access system according to the cycle of the groups of zero from the initial constant modulus correlation sequence length value to calculate the maximum number of clients in each group can be included in calculating the maximum number of clients in each group can be included; 4) according to the cyclic shift interval of each group the maximum number of clients and each of the groups can contain initial constant modulus zero autocorrelation sequences corresponding to the number of cyclic shifts corresponding to the UE group each included in an uplink to obtain respective quadrature reference signal.

[0013] 其中,所述循环移位间隔基准为所述通用陆地无线接入系统的信道模型的信道长 Channel Channel Model [0013] wherein the cyclic shift interval of the reference universal terrestrial radio access systems with long

度值,若所述分组组数为K,所述循环移位间隔基准为D,每一组对应循环移位间隔为Δ” Value, if the number of packet groups is K, the cyclic shift interval criterion is D, each group corresponding to the cyclic shift interval Δ "

Δ2, ... , Δκ,则每一循环移位间隔满足条件:A1 <、◊··< AK<D,且每一组的循环 Δ2, ..., Δκ, the cyclic shift interval each satisfy the condition: A1 <, ◊ ·· <AK <D, and the cycle of each group

移位间隔大于该组所包含的每一用户的上行信道时延扩展值,若所述K个小组中每一小 Shift interval greater than the uplink channel delay spread value for each of the users included in the group, if each of the K Group small

组包括的最大用户端数目分别为N1, N2, ... , Nk,则每一小组包括的用户端数目满足条件: κ The maximum number of clients included in the group are N1, N2, ..., Nk, each group comprising a number of the UE satisfy the condition: κ

Σ4 'Ni=L其中,L是所述初始恒模零自相关序列的长度值。 Σ4 'Ni = L where, L is the length of the initial zero-constant modulus values ​​from related sequences. '=1 , '= 1,

[0014] 综上所述,本发明的用于通用陆地无线接入系统的上行正交参考信号分配方法通过对同一基站辖区内的用户端进行分组,实现了采用码分复用的方式能够支持更多的正交导频信道的功能。 [0014] In summary, an uplink orthogonal reference signal allocation method for universal terrestrial radio access system according to the present invention by grouping the client area of ​​the same base station, implemented using a code division multiplexing manner capable of supporting additional orthogonal pilot channel function.

附图说明 BRIEF DESCRIPTION

[0015] 图1为现有的通过对同一个CAZAC序列进行循环移位产生不同的正交序列的示意图。 [0015] FIG. 1 is a schematic of a cyclic shift orthogonal sequence generated will be different for the same CAZAC sequence by existing.

[0016] 图2为现有的同一辖区中不同用户的上行参考信号产生方法的示意图。 [0016] FIG. 2 is a schematic diagram of the method of generating an uplink reference signal of different users in the same area in the conventional.

[0017] 图3为本发明的用于通用陆地无线接入系统的上行正交参考信号分配方法的示意图。 [0017] FIG. 3 is a schematic orthogonal uplink reference signal allocation method for universal terrestrial radio access system of the present invention.

[0018] 图4为现有的上行正交参考信号的码分复用分配方法的示意图。 [0018] FIG. 4 is a schematic diagram of the multiplexing method for allocating orthogonal codes conventional uplink reference signal points.

[0019] 图5为本发明的上行正交参考信号的码分复用分配方法的示意图。 It assigns a schematic diagram of multiplexing orthogonal codes uplink reference signal [0019] of the present invention FIG 5 minutes.

具体实施方式 Detailed ways

[0020] 请参阅图3,本发明的用于通用陆地无线接入系统的上行正交参考信号分配方法包括以下步骤: [0020] Referring to FIG 3, an uplink orthogonal reference signal allocation method for universal terrestrial radio access system according to the present invention comprises the steps of:

[0021] 1)设定所述通用陆地无线接入系统的基站辖区内的待分组用户端的分组组数,并根据所述通用陆地无线接入系统的上行信道长度设定循环移位间隔基准,之所以可以对某一基站辖区内的用户端进行分组,依据如下: [0021] 1) the number of packet groups is set to be the client packet in the base station area of ​​the universal terrestrial radio access systems, and the cyclic shift interval is set according to the uplink reference channel length of the universal terrestrial radio access system, the reason why the UE may be grouped within a certain area of ​​the base station, based on the following:

[0022] A、从无线通信信道的多径时延特性而言,由于所述多径时延特性可用信道的均方延迟扩展(RMS delay)参数来表征,根据文献1 (LJ Greenstein, V. Erceg, YS Yeh, and Μ.V. Clark,"A new path-gain/delay-spread propagation model for digitalcellular channels,,,IEEE Trans. Veh. Technol. , vol. 46, no. 2, May 1997)以及文献2 (IEEE 802. 16. 3c-01/29r4, "channel models for fixed wirelessapplications")提出的一种对信道的均方延迟扩展的建模方法,其认为信道的均方延迟扩展满足对数正态分布,其均值随着传输距离的增长而增大,无论对于市区、近郊、农村和山区,用户端的信道时延扩展值可通过下式计算获得: [0022] A, in terms of the multi-path delay characteristics of the wireless communication channel, due to the multipath delay characteristic of the available channels to characterize the mean square delay spread (RMS delay) parameters, according to Document 1 (LJ Greenstein, V. Erceg, YS Yeh, and Μ.V. Clark, "A new path-gain / delay-spread propagation model for digitalcellular channels ,,, IEEE Trans. Veh. Technol., vol. 46, no. 2, May 1997) and Document 2 (IEEE 802. 16. 3c-01 / 29r4, "channel models for fixed wirelessapplications") One proposed mean-square delay spread of the channel modeling, which that channel the mean square delay spread meet logarithmic normal normal distribution, the mean with increasing transmission distance is increased, both for urban, suburban, rural and mountainous areas, the UE channel delay spread values ​​can be obtained by the following formula:

[0 [0

Figure CN101192875BD00051

[0024] 其中,τ rms为信道时延扩展值(RMS delay)、(!为传输距离、T1是在传输距离为Ikm 情况下均方时延扩展的均值、ε是介于0. 5^1. 0之间的指数、y是一个服从标准Iognormal 分布的随机变量,需注意的是,由于受到地貌、距离、天线方向等多方面因素的影响,一个基站辖区内的无线信道时延扩展值可以从很小的值(十几毫微秒)变化到很大的值(几微秒),其并非一个固定常数,而是一个分布随用户变化的随机变量。 [0024] wherein, τ rms value of the channel delay spread (RMS delay), (! Is a transmission distance, T1 is the transmission distance is extended Fangshi Yan Ikm circumstances mean, ε is between 0.5 ^ 1 exponent between 0, y is a random variable distribution Iognormal standard, to be noted that, due to many factors topography, distance, direction, etc. of the antenna, the wireless channel delay spread value in a base station area can is changed from a small value (ten nanoseconds) to a large value (several microseconds), it is not a fixed constant, but is a random variable with a user change.

[0025] B、从信号传输带宽而言,由于在E-TURA标准化提案中,提出了一种自适应带宽控制的导频信道传输技术,在该技术中,用于信道质量检测的导频信号的带宽是依据用户(UE)和基站(Node B)的距离被自适应从预先设定的备选集中选择,以降低处于基站辖区边缘的用户的多小区干扰和提高信道质量(CQI)检测的准确性,由此可见,同一基站辖区内的用户端会采用不同的信号传输带宽,进而会导致各用户端具有不同的信道传输时延。 [0025] B, the signal transmission bandwidth, since the E-TURA standardization proposal, the proposed pilot channel transmission technique adaptive bandwidth control, in this technique, a channel quality detected pilot signal bandwidth is based on the distance between the user (UE) and a base station (Node B) is adaptively selecting alternative concentration from a preset, in order to reduce the user interference in multi-cell area of ​​the base station and the edge of the channel to improve the quality (CQI) detected accuracy, we can see, the client area of ​​the same base station use different transmission bandwidths of signals, in turn leading to the UE having different channel transmission delay.

[0026] C、从通用陆地无线接入系统的信道而言,由于在实际中信道参数是准静态的,因此,用户端的信道传输时延的变化较为缓慢。 [0026] C, from the channel in terms of universal terrestrial radio access system, since the actual parameters of the channel is quasi-static, and therefore, variation of the channel propagation delay of the UE is slow.

[0027] 由上所述可知,同一基站辖区内的待分组用户端的信道传输时延不尽相同,因此可以对同一基站辖区内的待分组用户端的进行分组,并先行设定分组的组数,例如,设定基站A辖区内的分组组数为3,并设定其循环移位间隔基准为D,且D =所述通用陆地无线接入系统的信道模型的信道长度值,通常可采用典型城区(TU)信道模型的信道长度值作为所述循环移位间隔基准。 [0027] From the result said to be grouped in the same area of ​​the base station the UE's channel transmission delay varies, and therefore the user may be grouped in the same group area of ​​the base station side, and a packet group number set in advance, For example, setting the number of packets in the base station group a is the area 3, and set the cyclic shift interval which reference is D, and D = the value of the channel length of the channel model universal terrestrial radio access systems, generally employed is typically channel length value (TU) channel model city as the cyclic shift interval criterion.

[0028] 2)根据所述分组组数、所述基站预先获得的其辖区内的各用户端的上行信道时延扩展值及所述循环移位间隔基准确定各组的循环移位间隔,由于上行信道的参数是准静态的,因此,基站会被周期性的告知各个用户的时延扩展信息,因此,基站是可以预先获得其辖区内的各用户端的上行信道时延扩展值的,而若将同一基站辖区内的用户端分为K组, 每一组对应循环移位间隔为A1, Δ2,...,Δκ,则每一循环移位间隔满足条件:A1 < A2 <-< Δκ<ϋ,同时,小组i的循环移位间隔Ai必须大于小组i内所有用户端的最大的时延扩展值。 [0028] 2) The number of packets to the group, the base obtained in advance for each client within their jurisdiction upstream channel delay spread value and the reference to determine the cyclic shift interval of cyclic shift interval of each group, due to the upward parameter channel is quasi-static, and therefore, the base station is periodically informed of the delay spread information of each user, therefore, the base station can be obtained in advance channel uplink channel delay spread value for each client within their jurisdiction, and if UE the same base station area into K groups, each group corresponding to the cyclic shift interval A1, Δ2, ..., Δκ, the cyclic shift interval each satisfy the condition: A1 <A2 <- <Δκ <ϋ while the cyclic shift interval i Ai group must be greater than the maximum delay spread value for all clients in the group i. 例如,若同一基站辖区内的用户端分为3组,则可将Δ” Δ2,Δ3确定为:Δ1 = D/3,Δ2 = D/2, A3 = D,需注意的是,每一组的循环移位间隔并非以本实施方式为限,本领域技术人员可根据实际情况予以确定,例如,当辖区内的各用户端的上行信道时延扩展值 For example, if the client area of ​​the same base station are divided into 3 groups, can be Δ "Δ2, Δ3 determined as: Δ1 = D / 3, Δ2 = D / 2, A3 = D, to be noted that, each group cyclic shift interval is not limited to the present embodiment, those skilled in the art can be determined according to actual conditions, e.g., when the uplink channel delay spread value for each UE within the jurisdiction

较多的集中在D/3至D之间,则可设定 More concentrated in the D / 3 to D, may be set

Figure CN101192875BD00061

,Δ2 = D/2,Δ3 = D。 , Δ2 = D / 2, Δ3 = D.

[0029] 3)根据各小组的循环移位间隔及所述通用陆地无线接入系统的初始恒模零自相 [0029] 3) According to the initial constant modulus of cyclic shift interval of each group and the Universal Terrestrial Radio Access System zero autocorrelation

关序列的长度值计算各组能包含的最大用户端数目,例如,若同一辖区中用户端被归为K OFF sequence length value to calculate the maximum number of clients in each group can contain, for example, if the same area of ​​the UE is classified as K

个小组,所述K个小组中每一小组包括的最大用户端数目分别为N1, N2,. . .,Νκ,则每一小组包括的用户端数目满足条件 The number of client groups, the maximum number of clients for each of the K Group are included in the group N1, N2 ,..., Νκ, then each group satisfies the condition comprises

Figure CN101192875BD00062

且每一组所包含的每一用户的上行信道时延 Each group and each user's channel included in the uplink delay

扩展值小于该组循环移位间隔,其中,L是所述初始恒模零自相关序列的长度值,由此可见, 若K = 3,通常将具有较小的信道时延扩展值的用户端归为小组1,具有中等的信道时延扩展值的用户端被归为小组2,具有较大的信道时延扩展值的用户端被归为小组3。 The user is smaller than the set value of the extended cyclic shift interval, where, L is the length of the initial value of the constant modulus zero autocorrelation sequences, Thus, if K = 3, will generally have a small delay spread value of the channel end classified as group 1, having an intermediate channel delay spread value UE is classified as group 2, with a larger value of the channel delay spread of the UE is classified as group 3. 需注意的是,由于同一辖区内的一些用户端可能会处于待机等状态,因此通常仅对活跃用户端进行分组,所述活跃用户端包括需要发送上行正交参考信号的用户端,该等用户端可根据所属基站或自身的需要发送上行参考信号。 It is noted that, because some clients may be in the same area and the like in the standby state, the UE is generally only active group, the active end including a user needs to send an uplink signal of the UE orthogonal reference, such a user terminal may transmit uplink reference signal or the base station according to your own needs. [0030] 4)根据各组的循环移位间隔及各组能包含的最大用户端数目将所述初始恒模零自相关序列进行相应次数的循环移位以使各组所包含的相应用户端获得各自的上行正交参考信号,通常分配给同一个辖区中的不同用户端的上行正交参考信号是通过对同一个初始CAZAC序列进行循环移位生成的,例如,设该初始CAZAC序列为c [n],ie [1,K],其中L 是初始CAZAC序列的长度,L等于导频信号所占据的子载波个数,若对初始CAZAC序列作长度为Δ的循环右移后得到的序列为S,(c),则分配给小组1中的N1个用户的上行正交参考信号可以表示为: [0030] 4) The cyclic shift interval of each group the maximum number of clients and each of the groups can contain constant modulus initial zero autocorrelation sequences corresponding to cyclic shift number so that the user terminal included in each group obtaining respective uplink orthogonal reference signal, is typically assigned to a different area of ​​the same UE in an uplink orthogonal reference signal is obtained by an initial CAZAC sequence with a cyclic shift, for example, it is assumed that the initial CAZAC sequence C [ n], ie [1, K], where L is the length of the initial CAZAC sequence, L is equal to the number of sub-carrier frequency signal is turned occupied, as if the initial CAZAC sequence of length Δ cyclic sequence obtained right after N1 user's S, (c), allocated to the group 1 uplink orthogonal reference signals can be expressed as:

[0031] [0031]

Figure CN101192875BD00071

[0032] 分配给小组2中的N2个用户的上行正交参考信号可以表示为: [0032] N2 allocated to users in the group 2 uplink orthogonal reference signals can be expressed as:

[0033] [0033]

Figure CN101192875BD00072

[0034] 分配给小组m(l <m<K)中的Nm个用户的上行正交参考信号可以表示为 [0034] assigned to group m (l <m <K) of the uplink user Nm orthogonal reference signals can be expressed as

[0035] [0035]

Figure CN101192875BD00073

[0036] 分配给小组K中的Nk个用户的上行正交参考信号可以表示为: [0036] K is assigned to the group users Nk orthogonal uplink reference signal may be expressed as:

Figure CN101192875BD00074

上述各上行正交参考信号通过码分的方式即可复用在同一个短符号块(SB)上, 此外,在满足小组1内所有的用户的信道时延扩展都小于A1、小组2内所有的用户的信道 Each uplink signal by way of quadrature reference to the code division multiplexing symbol in the same short block (SB), in addition, in the group 1 satisfies all of the user the channel delay spread is less than the A1, all Group 2 user channel

时延扩展都小于Δ2.....小组K内所有的用户的信道时延扩展都小于情况下,上述 Delay spread is less than Delta] 2 ..... all users within the group of K channel delay spread is less than the case where the

所有参考信号在码域具有两两正交的特性,这个特性确保了时域信道估计的精度,使信道估计的结果既可以用于信道质量的检测也可以用于数据解调,基站根据各个用户的上行信道的瞬时时延扩展信息,自适应的将用户分配到不同的小组。 Results All reference signal having a characteristic code are orthogonal to each domain, and this feature ensures the accuracy of the time-domain channel estimation, channel estimation may be used to detect the channel quality it can also be used for data demodulation, the base station according to each user delay spread of the instantaneous uplink channel information, adaptively assign users to different groups.

[0039] 再请参见图4及图5,其进一步对现有上行用户参考信号码分复用方法和本发明所提出的上行用户参考信号码分复用方法进行了比较,假设L为CAZAC序列的长度,其等于上行短符号块的长度(33. 33 μ s),D为最大时延扩展,传统码分复用方法最多可以支持6个正交导频信道,本发明所提出的基于分组的上行正交参考信号分配方法将用户端分为3个小组,最多可以同时支持12个正交导频信道,其参数设置可为=A1 = D/3,A2 = D/2, A3 =D ;^ = 6,N2 = 4,N3 = 2。 [0039] Referring again to Figure 4 and 5, the number of uplink user reference signal is further proposed that the existing uplink user reference signal and code-division multiplexing method of the present invention is a method for division multiplexing comparison, it is assumed for the CAZAC sequence L the length of which is equal to the length of the short uplink symbol block (33. 33 μ s), D is the maximum delay spread, a conventional code division multiplexing can support up to six orthogonal pilot channel method, the present invention is proposed based on packet orthogonal uplink reference signal allocation method of a user terminal is divided into three groups, it can support up to 12 orthogonal pilot channels simultaneously, which may be a parameter set = A1 = D / 3, A2 = D / 2, A3 = D ; ^ = 6, N2 = 4, N3 = 2.

[0040] 综上所述,本发明的用于通用陆地无线接入系统的上行正交参考信号分配方法通过对上行用户进行基于信道时延长度的分组,可以支持与现有码分复用方法相比更多正交导频信道,可有效的提高通信系统的容量。 [0040] In summary, an uplink orthogonal reference signal allocation method for universal terrestrial radio access system according to the present invention by grouping the uplink user based on the length of the channel delay, can be supported with the existing code division multiplexing method compared more orthogonal pilot channels, can effectively increase the capacity of the communication system.

Claims (2)

1. 一种用于通用陆地无线接入系统的上行正交参考信号分配方法,其特征在于包括以下步骤:1)设定所述通用陆地无线接入系统的基站辖区内的待分组用户端的分组组数,并根据所述通用陆地无线接入系统的上行信道长度设定循环移位间隔基准;2)根据所述分组组数、所述基站预先获得的其辖区内的各用户端的上行信道时延扩展值及所述循环移位间隔基准确定各组的循环移位间隔;3)根据各小组的循环移位间隔及所述通用陆地无线接入系统的初始恒模零自相关序列的长度值计算各组能包含的最大用户端数目;4)根据各组的循环移位间隔及各组能包含的最大用户端数目将所述初始恒模零自相关序列进行相应次数的循环移位以使各组所包含的相应用户端获得各自的上行正交参考信号;若所述分组组数为K,所述循环移位间隔基准为D,每一组对应循环移位间 An uplink orthogonal reference signal allocation method for universal terrestrial radio access system is provided, comprising the steps of: 1) setting a packet to be grouped within the base station area of ​​the universal terrestrial radio access system user terminal 2) the number of packets to the group, the base station uplink channel obtained in advance for each client within their jurisdiction; group number, and the cyclic shift interval is set according to the uplink reference channel length of the universal terrestrial radio access system length value 3) of each group according to a cyclic shift interval and the universal terrestrial radio access system constant modulus initial zero autocorrelation sequence; delay spread value and the reference to determine the cyclic shift interval of cyclic shift interval of each group calculating the maximum number of clients in each group can be included; 4) according to the cyclic shift interval of each group the maximum number of clients and each of the groups can contain constant modulus initial zero autocorrelation sequences corresponding to cyclic shift frequency so each group included in the user terminal uplink to obtain respective quadrature reference signal; if the number of packet groups is K, the cyclic shift interval criterion is D, each group corresponds to a cyclic shift among 隔为A1, Δ2,...,Δκ,则每一循环移位间隔满足条件:A1S Δ2<···< AK<D,且每一组的循环移位间隔大于该组所包含的每一用户的上行信道时延扩展值;若所述K个小组中每一小组包括的最大用户端数目分别为N1, N2, ... , Nk,则每一小组包括的用户端数目满足条件: Compartment is A1, Δ2, ..., Δκ, then each cyclic shift interval satisfies the condition: A1S Δ2 <··· <AK <D, and the cyclic shift interval is larger than each of the groups included in the group for each uplink channel delay spread value of the user; if the maximum number of clients in each group of the K group are included in the N1, N2, ..., the number of the UE Nk, then each group satisfies the condition comprises:
Figure CN101192875BC00021
其中,L是所述初始恒模零自相关序列的长度 Where, L is the length of the initial constant modulus zero autocorrelation sequence
2.如权利要求1所述的用于通用陆地无线接入系统的上行正交参考信号分配方法, 其特征在于:所述循环移位间隔基准为所述通用陆地无线接入系统的信道模型的信道长度值。 2. The quadrature reference signal for uplink allocation method for universal terrestrial radio access system according to claim 1, wherein: the cyclic shift interval of the reference model as a channel universal terrestrial radio access system channel length value.
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