CN101192875A - 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 PDFInfo
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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 according to 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 zero autocorrelation 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 ensure that 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
Technical field
The present invention relates to a kind of uplink orthogonal reference signal distribution method, particularly a kind of uplink orthogonal reference signal distribution method that is used for general land wireless access system.
Background technology
At present, in the general land wireless access system (E-UTRA) of evolution, base station (Node B) is by the uplink reference signals that receives being analyzed to determine based on downlink transfer diversity (beamforming) method in the dispatching method of channel information and time division duplex (TDD) system, because E-UTRA standardization effort group will have the modulator approach of the single carrier frequency division multiplexing system (SC-FDMA) of Cyclic Prefix as uplink, and in SC-FDMA, the uplink subframe is made up of several OFDM (OFDM) symbols through discrete Fourier transform (DFT) (DFT) spread spectrum, therefore, E-UTRA standardization effort group determines to adopt in the uplink subframe DFT spread spectrum OFDM symbol (SB1 and SB2) of two weak points to come transmitting uplink reference signal (pilot), and permanent mould zero auto-correlation (CAZAC) sequence is defined as uplink reference signals.
Usually, permanent mould zero auto-correlation (CAZAC) sequence comprises Zadoff-Chu sequence and GCL sequence, and wherein the Zadoff-Chu sequence is a special case of GCL sequence.In the SC-FDAM communication system of certain bandwidth, the subcarrier number that uplink reference signals can occupy is specific, therefore the length of required reference signal (CAZAC sequence) also is specific, and the CAZAC sequence of length-specific can obtain by the following method: at first setting required sequence length is NP, wherein NG is the least prime greater than NP, producing length then is the optkmal characteristics of the CAZAC sequence of NG with assurance CAZAC sequence, the CAZAC sequence brachymemma that with length is NG again is the reference signal of NP to produce length, at last this reference signal is applied in the OFDM modulation (IFFT) and carries out modulation transmissions on the corresponding N P subcarrier, thereby form short symbol SB 1 or SB2 in the subframe.
Because in current E-UTRA standardization, the multiplexing method that offers a plurality of users' (UE) uplink orthogonal pilot channel comprises following several: frequency division multiplexing (FDM), code division multiplexing (CDM), mixing frequency division code division multiplexing, wherein, in frequency-division multiplexing method, produce the frequency division multiplexing reference signal of quadrature by the sub-carrier set that is used for pilot transmission of distributing different quadratures for each user; In the code division multiplexing method, because all reference signals all occupy one section public continuous sub-carriers collection, therefore the reference signal of distributing to different user is to produce by the cyclic shift of same CAZAC sequence being carried out different length, only need by the CDM reference signal that receives and the original CDM reference signal of transmission are carried out the relevant time domain channel response estimated value that can obtain a plurality of users of cyclic shift at receiving terminal, this shows, angle from supported maximum orthogonality sequence number and cell edge interference randomization, the method of code division multiplexing more has superiority than the method for frequency division multiplexing, from but a kind of uplink orthogonal pilot channel multiplexing method that gets a good chance of.
Referring to Fig. 1, it shows in the CDM method, is produced the process of a plurality of orthogonal sequences by the different cyclic shifts of same initial pilot tone CAZAC sequence.If initial pilot tone (CAZAC#1) sequence is c, the sequence that c cyclic shift Δ is produced is made as S
Δ(c), because sequence c has zero circulation autocorrelation performance, if (N-1) Δ surpasses the maximum delay expansion greater than all users (UE) of sequence length and Δ, then pilot tone (CAZAC#1) sequence respectively through the displacement figure place be 0, Δ, 2 Δs ... (N-1) obtain sequence S after the displacement of Δ
0(c), S
Δ(c), S
2 Δs(c) ... S
(N-1) Δ(c) keep pairwise orthogonal.Therefore, orthogonal sequence S
0(c), S
Δ(c), S
2 Δs(c) ... S
(N-1) Δ(c) can distribute to user UE#1, UE#2, UE#3 accordingly respectively ... UE#N is as these users' uplink reference signals.
Referring to Fig. 2, it shows the uplink reference signals production process of different user in the same area under one's jurisdiction.At first, at transmitting terminal, after the CAZAC sequence is handled through cyclic shift, again through having transformed to frequency domain after the discrete Fourier transform (DFT) isometric (DFT) with sequence length.Owing to remain a Zadoff-Chu/GCL sequence through the Zadoff-Chu/GCL sequence behind the Fourier transform, the time-domain cyclic shift of sequence can equivalence be the linear phase shift of frequency domain, so quadrature CAZAC sequence also can add at frequency domain without the DFT conversion.These CAZAC sequences with different linear phase shifts are mapped directly on the corresponding pilot sub-carrier of OFDM modulation, carry out discrete inverse Fourier transform (IFFT) operation and add carrier signal, at last, after also string conversion and adding Cyclic Prefix are operated, the reference signal sequence that obtains is a uplink reference signals, can on the SB1 of sub-frame of uplink or SB2 character position, transmit, that is launch by radio frequency.
In the system parameters of the SC-FDMA that has determined based on E-UTRA, the length of short symbol (SB) is generally 33.33 μ s.Therefore, guaranteeing that all sequences through obtaining after the cyclic shift still have under the prerequisite of orthogonality, considering that the maximum channel time delay is that a CAZAC sequence can produce 6 orthogonal sequences (Floor ((the short symbol lengths of 33.33 μ s)/(TU channel length))=6) by cyclic shift at most under the situation of 5 μ s (TU channel model)
Existing E-UTRA standardization motion is known by emulation: having only a sub-district only to use an initial CAZAC sequence and multiplexing number of users to be no more than at 4 ~ 6 o'clock, the CDM method can obtain the performance similar to the FDM method, if be that the number of users of supporting surpasses aforementioned range, just need to adopt second initial CAZAC sequence, can bring the remarkable deterioration on the performance like this.
Just because of an initial CAZAC sequence can only be used in a sub-district, and the cyclic shift interval of sequence must be greater than the length of the maximum delay of all users in sub-district expansion, so the orthogonal pilot channels that traditional C DM method can provide is very limited, and in the FDM method, in order to increase the number of orthogonal pilot channels, under the cost of sacrificing certain performance, can adopt two intersymbol staggered Comb Pilot distribution techniques of weak point in the subframe, even so, adopt two short symbols also can only maximum support 12 users' reference signal transmission simultaneously.Therefore, the number of users of transmission broadband reference signal is extremely limited simultaneously on two short character positions of sub-frame of uplink, if will in uplink, use based on the scheduling of channel information with the raising throughput of system, the user who needs base station (Node B) to dispatch can be very many, and existing all kinds of technical methods are difficult to satisfy user's demand.
In sum, since the user that is re-used need be in identical short symbolic blocks the uplink pilot signal of while transmission broadband, but the method for existing code division multiplexing is subjected to the restriction of CAZAC sequence length and circulation time shift length, its maximum user number that can support is very limited, simultaneously, for avoiding the interference in the sub-district, the length of circulation time shift must be greater than the maximum delay expansion of all users in the sub-district, the maximum user side decreased number that further causes existing code division multiplexing method to support, can't satisfy uply, how solve that the shortcoming of prior art is real to have become the technical task that industry needs to be resolved hurrily based on the channel information scheduling requirement.
Summary of the invention
The object of the present invention is to provide a kind of uplink orthogonal reference signal distribution method that is used for general land wireless access system,, improve capability of communication system to support more orthogonal pilot channels.
In order to achieve the above object, the invention provides a kind of uplink orthogonal reference signal distribution method that is used for general land wireless access system, it comprises step: 1) set the local packet group number for the treatment of the grouping user end in base station of described general land wireless access system, and according to the up channel length setting cyclic shift interval benchmark of described general land wireless access system; 2) up channel time delay expanding value of its each the local user side that obtains in advance according to described packet group number, described base station and described cyclic shift interval benchmark are determined cyclic shift interval of each group; 3) calculate the maximum user side number that each group can comprise according to the length value of initial permanent mould zero autocorrelation sequence of the cyclic shift interval of each group and described general land wireless access system and calculate the maximum user side number that each group can comprise; 4) the maximum user side number that can comprise according to the cyclic shift interval of each group and each group carries out the cyclic shift of corresponding number of times so that the relative users end acquisition uplink orthogonal reference signal separately that each group is comprised with described initial permanent mould zero autocorrelation sequence.
Wherein, described cyclic shift interval benchmark is the channel length values of the channel model of described general land wireless access system, if described packet group number is K, described cyclic shift interval benchmark is D, and each organizes corresponding cyclic shift interval is Δ
1, Δ
2..., Δ
K, then each cyclic shift interval satisfies condition: Δ
1＜Δ
2＜...＜Δ
K≤ D, and the cyclic shift interval of each group is greater than each user's that this group comprised up channel time delay expanding value, if the maximum user side number that each group comprises in the described K group is respectively N
1, N
2..., N
K, then the user side number that comprises of each group satisfies condition:
Wherein, L is the length value of described initial permanent mould zero autocorrelation sequence.
In sum, the uplink orthogonal reference signal distribution method that is used for general land wireless access system of the present invention is by dividing into groups to the local user side in same base station, realized adopting the mode of code division multiplexing can support the function of more orthogonal pilot channels.
Description of drawings
Fig. 1 is existing by same CAZAC sequence being carried out the schematic diagram of the different orthogonal sequence of cyclic shift generation.
Fig. 2 is the schematic diagram of the uplink reference signals production method of different user in the existing same area under one's jurisdiction.
Fig. 3 is the schematic diagram that is used for the uplink orthogonal reference signal distribution method of general land wireless access system of the present invention.
Fig. 4 is the schematic diagram of the code division multiplexing distribution method of existing uplink orthogonal reference signal.
Fig. 5 is the schematic diagram of the code division multiplexing distribution method of uplink orthogonal reference signal of the present invention.
Embodiment
See also Fig. 3, the uplink orthogonal reference signal distribution method that is used for general land wireless access system of the present invention may further comprise the steps:
1) the local packet group number for the treatment of the grouping user end in base station of the described general land wireless access system of setting, and according to the up channel length setting cyclic shift interval benchmark of described general land wireless access system, why can divide into groups to the local user side in a certain base station, according to as follows:
A, multidiameter delay characteristic from radio communication channel, because postponing expansion (RMS delay) parameter, all sides of described multidiameter delay characteristic available channel characterize, according to document 1 (L.J.Greenstein, V.Erceg, Y.S.Yeh, and M.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 ") a kind of modeling method that all sides of channel is postponed expansion of proposing, it thinks that all sides of channel postpone expansion and satisfy logarithm normal distribution, its average increases along with the growth of transmission range, no matter for the urban district, the suburbs, rural area and mountain area, the channel delay expanding value of user side can be calculated by following formula and obtain:
τ
rms＝T
1d
εy (1)
Wherein, τ
RmsFor channel delay expanding value (RMS delay), d are transmission range, T
1Be to be that average, the ε of all square time delay expansion under the 1km situation is that index, y between 0.5 ~ 1.0 is one and obeys the stochastic variable that standard lognormal distributes in transmission range, be noted that, owing to be subjected to the influence of many-sided factors such as landforms, distance, antenna direction, the local wireless channel time delay expanding value in base station can change to very big value (a few microsecond) from very little value (tens nanoseconds), it is not a fixed constant, but the stochastic variable that distribution changes with the user.
B, from the signal transmission bandwidth, because in E-TURA standardization motion, a kind of pilot channel transmission technology of adaptive bandwidth control has been proposed, in this technology, the bandwidth that is used for the pilot signal of channel quality detection be distance according to user (UE) and base station (Node B) by self adaptation from predefined alternative concentrated selection, be in the user's at edge, area under one's jurisdiction, base station many area interference and the accuracy that improves channel quality (CQI) detection with reduction, this shows, the local user side in same base station can adopt different signal transmission bandwidths, and then can cause each user side to have different channel transmission time delays.
C, from the channel of general land wireless access system because channel parameter is quasi-static in practice, therefore, the variation of the channel transmission time delay of user side is comparatively slow.
From the above mentioned as can be known, the channel transmission time delay for the treatment of the grouping user end that same base station is local is not quite similar, therefore can be to local the treating dividing into groups of grouping user end in same base station, and go ahead of the rest and set the group number of grouping, for example, setting the local packet group number of base station A is 3, and to set its cyclic shift interval benchmark be D, and the channel length values of the channel model of the described general land wireless access system of D=, the channel length values that can adopt typical city (TU) channel model usually is as described cyclic shift interval benchmark.
2) up channel time delay expanding value of its each the local user side that obtains in advance according to described packet group number, described base station and described cyclic shift interval benchmark are determined cyclic shift interval of each group, because the parameter of up channel is quasi-static, therefore, each user's time delay extend information can periodically be informed in the base station, therefore, the base station is the up channel time delay expanding value that can obtain its each local user side in advance, and if the user side that same base station is local is divided into the K group, each organizes corresponding cyclic shift interval is Δ
1, Δ
2..., Δ
K, then each cyclic shift interval satisfies condition: Δ
1＜Δ
2＜...＜Δ
K≤ D, simultaneously, the cyclic shift interval Δ of the i of group
iMust be greater than the time delay expanding value of the maximum of all user sides in the i of group.For example, if the local user side in same base station is divided into 3 groups, then can be with Δ
1, Δ
2, Δ
3Be defined as: Δ
1=D/3, Δ
2=D/2, Δ
3=D is noted that, the cyclic shift interval of each group is not to exceed with present embodiment, those skilled in the art can be determined according to actual conditions, for example, when more the concentrating between the D/3 to D of up channel time delay expanding value of each local user side, then can set
Δ
2＝D/2，Δ
3＝D。
3) length value according to initial permanent mould zero autocorrelation sequence of the cyclic shift interval of each group and described general land wireless access system calculates the maximum user side number that each group can comprise, for example, if user side is classified as K group in the same area under one's jurisdiction, the maximum user side number that each group comprises in the described K group is respectively N
1, N
2..., N
K, then the user side number that comprises of each group satisfies condition:
And each user's that each group is comprised up channel time delay expanding value is organized cyclic shift interval less than this, wherein, L is the length value of described initial permanent mould zero autocorrelation sequence, this shows, if K=3, the user side that will have less channel delay expanding value usually is classified as group 1, and the user side with medium channel delay expanding value is classified as group 2, and the user side with bigger channel delay expanding value is classified as group 3.Be noted that, because same some local user sides may be in states such as standby, therefore only any active ues end is divided into groups usually, described any active ues end comprises that needs send the user side of uplink orthogonal reference signal, and these user sides can send uplink reference signals according to affiliated base station or the needs of self.
4) the maximum user side number that can comprise according to the cyclic shift interval of each group and each group carries out the cyclic shift of corresponding number of times so that the relative users end acquisition uplink orthogonal reference signal separately that each group is comprised with described initial permanent mould zero autocorrelation sequence, usually the uplink orthogonal reference signal of distributing to the different user end in the same area under one's jurisdiction generates by same initial CAZAC sequence being carried out cyclic shift, for example, if this initial CAZAC sequence is c[n], i ∈ [1, K], wherein L is the length of initial CAZAC sequence, L equals the occupied subcarrier number of pilot signal, if be that the sequence that obtains behind the ring shift right of Δ is S to initial CAZAC sequence as length
Δ(c), then distribute to N in the group 1
1Individual user's uplink orthogonal reference signal can be expressed as:
{S
0(c)，S
Δ1(c)，…，S
(N1-1)Δ1(c)}(2)
Distribute to the N in the group 2
2Individual user's uplink orthogonal reference signal can be expressed as:
{S
N1Δ1(c)，S
N1Δ1+Δ2(c)，…，S
N1Δ1+(N2-1)Δ2(c)}(3)
Distribute to the m of the group (N among 1＜m＜K)
mIndividual user's uplink orthogonal reference signal can be expressed as:
Distribute to the N among the K of group
KIndividual user's uplink orthogonal reference signal can be expressed as:
The mode that above-mentioned each uplink orthogonal reference signal divides by sign indicating number be reusable on same short symbolic blocks (SB), in addition, all users' channel delay is expanded all less than Δ during satisfying group 1
1, in the group 2 all users' channel delay expansion all less than Δ
2..., in the K of group all users' channel delay expansion all less than Δ
KSituation under, above-mentioned all reference signals have the characteristic of pairwise orthogonal in the sign indicating number territory, this characteristic has been guaranteed the precision that time domain channel is estimated, the detection that makes the result of channel estimating both can be used for channel quality also can be used for data demodulates, the base station is according to the instantaneous time delay extend information of each user's up channel, adaptive the user is assigned to different groups.
See also Fig. 4 and Fig. 5 again, it further compares existing up user reference signal code division multiplexing method and up user reference signal code division multiplexing method proposed by the invention, suppose that L is the length of CAZAC sequence, it equals the length (33.33 μ s) of up short symbolic blocks, D is the maximum delay expansion, conventional code divides multiplexing method can support 6 orthogonal pilot channels at most, packet-based uplink orthogonal reference signal distribution method proposed by the invention is divided into 3 groups with user side, can support 12 orthogonal pilot channels simultaneously at most, its parameter setting can be: Δ
1=D/3, Δ
2=D/2, Δ
3=D; N
1=6, N
2=4, N
3=2.
In sum, the uplink orthogonal reference signal distribution method of general land wireless access system that is used for of the present invention is by carrying out the grouping based on channel delay length to up user, can support to compare more orthogonal pilot channels, can effectively improve capability of communication system with existing code division multiplexing method.
Claims (4)
1. uplink orthogonal reference signal distribution method that is used for general land wireless access system is characterized in that may further comprise the steps:
1) set the local packet group number for the treatment of the grouping user end in base station of described general land wireless access system, and according to the up channel length setting cyclic shift interval benchmark of described general land wireless access system;
2) up channel time delay expanding value of its each the local user side that obtains in advance according to described packet group number, described base station and described cyclic shift interval benchmark are determined cyclic shift interval of each group;
3) length value according to initial permanent mould zero autocorrelation sequence of the cyclic shift interval of each group and described general land wireless access system calculates the maximum user side number that each group can comprise;
4) the maximum user side number that can comprise according to the cyclic shift interval of each group and each group carries out the cyclic shift of corresponding number of times so that the relative users end acquisition uplink orthogonal reference signal separately that each group is comprised with described initial permanent mould zero autocorrelation sequence.
2. the uplink orthogonal reference signal distribution method that is used for general land wireless access system as claimed in claim 1 is characterized in that: described cyclic shift interval benchmark is the channel length values of the channel model of described general land wireless access system.
3. the uplink orthogonal reference signal distribution method that is used for general land wireless access system as claimed in claim 1 is characterized in that: if described packet group number is K, described cyclic shift interval benchmark is D, and each organizes corresponding cyclic shift interval is Δ
1, Δ
2..., Δ
K, then each cyclic shift interval satisfies condition: Δ
1＜Δ
2＜...＜Δ
K≤ D, and the cyclic shift interval of each group is greater than each user's that this group comprised up channel time delay expanding value.
4. the uplink orthogonal reference signal distribution method that is used for general land wireless access system as claimed in claim 3 is characterized in that: if the maximum user side number that each group comprises in the described K group is respectively N
1, N
2..., N
K, then the user side number that comprises of each group satisfies condition:
Wherein, L is the length value of described initial permanent mould zero autocorrelation sequence.
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| US11711166B2 (en) | 2017-06-16 | 2023-07-25 | Huawei Technologies Co., Ltd. | Information transmission method and apparatus |
| CN110475348A (en) * | 2018-05-11 | 2019-11-19 | 电信科学技术研究院有限公司 | A kind of method, apparatus and readable storage medium storing program for executing sending PUCCH |
| CN110475348B (en) * | 2018-05-11 | 2022-04-19 | 大唐移动通信设备有限公司 | Method and device for transmitting PUCCH and readable storage medium |
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