CN101778068B - Frequency domain position-confirming method and device of positioning reference signal - Google Patents

Abstract

The invention discloses frequency domain position-confirming method and device of a positioning reference signal. The method comprises the following step of: confirming a start physical resource block position h of a positioning reference signal on a time-domain orthogonal-frequency division multiplexing (OFDM) signal according to the following formula, wherein h is equal to N<DL>RB-N<PRS>RB or floor((N<DL>RB-N<PRS>RB)/2), NRBDL presents a downlink configured bandwidth by using continuous subcarriers in a frequency domain as a unit, NRBPRS is a PRS bandwidth, and [] presents downward rounding. The invention ensures the whole performance of the system.

Description

Location reference signals frequency domain position-confirming method and device

Technical field

The present invention relates to the communications field, in particular to a kind of location reference signals frequency domain position-confirming method and device.

Background technology

On OFDM (Orthogonal Frequency Division Multiplexing, referred to as OFDM) technological essence, be a kind of multi-carrier modulation communication technology, this technology is one of core technology in the 4th third-generation mobile communication.On frequency domain, the multipath channel of OFDM presents the frequency selective fading characteristic, in order to overcome this decline, channel is divided on frequency domain to a plurality of subchannels, the spectral characteristic of every sub-channels is near flat all, and each sub-channels of OFDM is mutually orthogonal, therefore allow the frequency spectrum of subchannel overlapped, thus can very large limit land productivity frequency spectrum resource.

Long Term Evolution (Long Term Evolution, referred to as LTE) system is the essential planning of third generation partnership.Fig. 1 is the schematic diagram according to the LTE system wireless frame structure of correlation technique, Frequency Division Duplexing (FDD) (Frequency Division Duplex in the LTE system, referred to as FDD) under pattern, the radio frames of a 10ms (radio frame) is 0.5ms by 20 length, the time slot (slot) of numbering 0～19 forms, and time slot 2i and 2i+1 form subframe (subframe) i that length is 1ms.When system adopts the regular circulation prefix, a up/down row symbol that time slot comprises 7 length, when system adopts extended cyclic prefix, a up/down row symbol that time slot comprises 6 length.Fig. 2 is the Physical Resource Block schematic diagram of the LTE system that is 5MHz of the system bandwidth according to correlation technique, as shown in Figure 2, a Resource Unit (Resource Element, referred to as RE) be a subcarrier in an OFDM symbol, and a downlink resource piece (Resource Block, referred to as RB) by continuous 12 subcarriers and continuous 7 (being 6 in the time of extended cyclic prefix) OFDM symbols, formed, on frequency domain, being 180kHz, is the time span of a general time slot on time domain.Divide timing in resource, the Resource Block of take is distributed as base unit.

The LTE system is supported multiple-input and multiple-output (the Multiple Input MultipleOutput of 4 antennas, referred to as MIMO) application, corresponding antenna port #0, antenna port #1, antenna port #2, antenna port #3 adopts the publicly-owned reference signal in community (the Cell-specific reference signals of full bandwidth, referred to as CRS) mode, when Cyclic Prefix is the regular circulation prefix, these publicly-owned reference signal positions in Physical Resource Block as shown in Figure 3 a, when Cyclic Prefix is extended cyclic prefix, these publicly-owned reference signals in the position in Physical Resource Block as shown in Fig. 3 b.

In addition, also has the proprietary reference signal of a kind of user (UE-specific referencesignals), this reference signal is proprietary Physical Shared Channel (the Physicaldownlink shared channel the user only, referred to as PDSCH) transmit on the time-frequency domain position at place, wherein, the publicly-owned reference signal function in community comprises to be measured and down channel estimation (demodulation) down channel quality, and the publicly-owned reference signal in community initial position in described Physical Resource Block is $v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="Cell\; ID\; mod"\; filenames="H200910265590XE00012.png,H200910265590XE00031.png"\; state="\{\{state\}\}">Cell</figure-callout>}}^{\mathrm{ID}}\mathrm{mod}6,$ Wherein, N _iD ^cellthe sign that means community.Can realize the publicly-owned reference signal difference of neighbor cell by plot planning, thereby reach, reduce the purpose that disturb adjacent area.

The position of terminal in community (User Equipment, referred to as UE) need to be measured in base station, could effectively configure and dispatch for UE like this, at present, adopts the CRS reference signal to be measured for terminal, exists following restrictions:

The every frame of CRS sequence repeats, and cross correlation is bad;

In the time of two antenna transmission, the maximum multiplexing factor is 3, and the interference between neighbor cell is larger;

The semi-static configuration of CRS power, positioning performance is limited.

At present, solution of the above problems is to position by sending location reference signals (Positionreference signal, referred to as PRS), thereby guarantees the positioning precision of UE, the transmission cycle of PRS is 160ms, 320ms, 640ms, 1280ms, the continuous subframes quantity that PRS sends is 1,2,4,6.

The PRS sequence

according to following formula, define:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\&CenterDot;c\left(2m\right))+\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="H200910265590XE00011.png,H200910265590XE00031.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{1}{\sqrt{2}}(1-2\&CenterDot;c(2m+1)),$ $m=\mathrm{0,1},...,{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

c(n)＝(x ₁(n+N _C)+x ₂(n+N _C))mod2

x ₁(n+31)＝(x ₁(n+3)+x ₁(n))mod2

x ₂(n+31)＝(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n))mod2，

Wherein, N _c=1600, x ₁(0)=1, x ₁(n)=0, n=1,2 ..., 30, x ₂according to $c_{\mathrm{init}}={\mathrm{\&Sigma;}}_{i=0}^{30}{x}_2\left(i\right)\&CenterDot;2^i$ Produce c _initaccording to following formula, produce:

$c_{\mathrm{init}}=2^{10}\&CenterDot;(7\&CenterDot;(n_s+1)+l+1)\&CenterDot;(2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+1)+2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+N_{\mathrm{CP}},$

Wherein, n _sbe a time slot index in radio frames, l is the index of OFDM symbol in a time slot, and k is the sub-carrier indices on OFDM symbol l, N _rB ^pRSit is the PRS bandwidth of high-level signaling configuration.Pseudo random sequence c (i) can produce according to above-mentioned formula, N _iD ^cellthe sign that means community.

By the PRS sequence

be mapped to time slot n according to following formula _sthe modulation symbol a of the subcarrier k that the OFDM symbol of antenna port p=6 is l _{k, l} ^(p)upper:

$a_{k,l}^{\left(p\right)}=r_{l,n_s}\left(m^{\&prime;}\right)$

When the systemic circulation prefix is the regular circulation prefix:

$k=6(m+N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}})+(6-l+v_{\mathrm{shift}})\mathrm{<figure-callout\; id="6"\; label="mod"\; filenames="H200910265590XE00012.png,H200910265590XE00031.png"\; state="\{\{state\}\}">mod</figure-callout>}6$

$m=\mathrm{0,1},...,2\&CenterDot;N_{\mathrm{RB}}^{\mathrm{PRS}}-1$

$m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}$

When the systemic circulation prefix is extended cyclic prefix:

$k=6(m+N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}})+(5-l+v_{\mathrm{shift}})\mathrm{<figure-callout\; id="6"\; label="mod"\; filenames="H200910265590XE00012.png,H200910265590XE00031.png"\; state="\{\{state\}\}">mod</figure-callout>}6$

$m=\mathrm{0,1},...,2\&CenterDot;N_{\mathrm{RB}}^{\mathrm{PRS}}-1$

$m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}$

Wherein, $v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="Cell\; ID\; mod"\; filenames="H200910265590XE00012.png,H200910265590XE00031.png"\; state="\{\{state\}\}">Cell</figure-callout>}}^{\mathrm{ID}}\mathrm{mod}6,$ N _rB ^{max, DL}mean the descending maximum bandwidth that can configure, N _rB ^dLthe bandwidth that means downstream arrangements, N _rB ^{max, DL}and N _rB ^dLall that to take continuous 12 subcarriers of frequency domain be unit representation, PRS in the time-frequency position in Physical Resource Block as shown in Fig. 4 a and Fig. 4 b.

Work as N _rB ^dL-N _rB ^pRSduring for odd number, the initial physics resource block location h of location reference signals PRS on time domain orthogonal frequency division multiplex OFDM symbol is basis $h=(N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}})/2,$ Due to N _rB ^dL-N _rB ^pRSfor odd number, now take 0.5 RB as unit determines initial physics resource block location, therefore, only has a PRS in first PRB at PRS place and last PRB on a PRS time domain OFDM symbol, and two PRS are arranged in the PRB at other PRS places, this will cause the PRS skewness, in addition, due to Physical Downlink Shared Channel (Physical downlink shared channel, referred to as PDSCH) resource to distribute be to take Resource Block to carry out as unit, the scheduling that this has also affected PDSCH, cause the hydraulic performance decline of entire system.

Summary of the invention

Main purpose of the present invention is to provide a kind of location reference signals frequency domain position to determine scheme, at least to address the above problem.

According to an aspect of the present invention, provide a kind of location reference signals frequency domain position-confirming method, having comprised: according to following formula, determined the initial physics resource block location h of location reference signals PRS on time domain orthogonal frequency division multiplex OFDM symbol: $h=N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ Perhaps,

wherein, N _rB ^dLthe bandwidth that means downstream arrangements, N _rB ^dLto take continuous 12 subcarriers of frequency domain to be meaned as unit, N _rB ^pRSthe bandwidth of described PRS, wherein,

mean to round downwards.

Preferably, determine the subcarrier k on the time domain OFDM symbol l at PRS place described in a subframe according to following formula: when the systemic circulation prefix is the regular circulation prefix:

k＝6(m+2×h)+(6-l+v _shift)mod6

When the systemic circulation prefix is extended cyclic prefix:

k＝6(m+2×h)+(5-l+v _shift)mod?6

Wherein,

$m=\mathrm{0,1},...,2\&CenterDot;N_{\mathrm{RB}}^{\mathrm{PRS}}-1;$

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="Cell\; ID\; mod"\; filenames="H200910265590XE00012.png,H200910265590XE00031.png"\; state="\{\{state\}\}">Cell</figure-callout>}}^{\mathrm{ID}}\mathrm{mod}6$

N _rB ^{max, DL}mean the descending maximum bandwidth that can configure, N _rB ^{max, DL}and N _rB ^dLall that to take continuous 12 subcarriers of frequency domain be unit representation, n _sit is a time slot index in radio frames.

Preferably, according to following formula by described PRS sequence

be mapped to time slot n _sthe modulation symbol a of the subcarrier k that the OFDM symbol of antenna port p=6 is l _{k, l} ^(p)upper, wherein,

$a_{k,l}^{\left(p\right)}=r_{l,n_s}\left(m^{\&prime;}\right):$

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\&CenterDot;c\left(2m\right))+\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="H200910265590XE00011.png,H200910265590XE00031.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{1}{\sqrt{2}}(1-2\&CenterDot;c(2m+1)),$ $m=\mathrm{0,1},...,{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

c(n)＝(x ₁(n+N _C)+x ₂(n+N _C))mod2

x ₁(n+31)＝(x ₁(n+3)+x ₁(n))mod2

x ₂(n+31)＝(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n))mod2，

$m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ Perhaps, $m^{\&prime;}=m+2\&times;(N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}),$ Perhaps,

Wherein, N _c=1600, x ₁(0)=1, x ₁(n)=0, n=1,2 ..., 30, x ₂according to $c_{\mathrm{init}}={\mathrm{\&Sigma;}}_{i=0}^{30}{x}_2\left(i\right)\&CenterDot;2^i$ Produce c _initaccording to following formula, produce:

$c_{\mathrm{init}}=2^{10}\&CenterDot;(7\&CenterDot;(n_s+1)+t+1)\&CenterDot;(2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+1)+2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+N_{\mathrm{CP}},$

Wherein, n _sbe a time slot index in radio frames, t is the index of OFDM symbol in a time slot, and k is the sub-carrier indices on OFDM symbol l, N _iD ^cellthe sign that means community, n _sit is a time slot index in radio frames.

Preferably, said method also comprises: according to described initial physics resource block location h, described PRS is mapped on physical resource.

According to a further aspect in the invention, also provide a kind of location reference signals frequency domain position to determine device, comprise: the first determination module, for determine the initial physics resource block location h of location reference signals PRS on time domain orthogonal frequency division multiplex OFDM symbol according to following formula: $h=N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ Perhaps,

wherein, N _rB ^dLthe bandwidth that means downstream arrangements, N _rB ^dLto take continuous 12 subcarriers of frequency domain to be meaned as unit, N _rB ^pRSit is the bandwidth of described PRS.

Preferably, said apparatus also comprises: the second determination module, for determine the subcarrier k on the time domain OFDM symbol l at PRS place described in a subframe according to following formula:

When the systemic circulation prefix is the regular circulation prefix:

k＝6(m+2×h)+(6-l+v _shift)mod6

When the systemic circulation prefix is extended cyclic prefix:

k＝6(m+2×h)+(5-l+v _shift)mod6

Wherein,

$m=\mathrm{0,1},...,2\&CenterDot;N_{\mathrm{RB}}^{\mathrm{PRS}}-1;$

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="Cell\; ID\; mod"\; filenames="H200910265590XE00012.png,H200910265590XE00031.png"\; state="\{\{state\}\}">Cell</figure-callout>}}^{\mathrm{ID}}\mathrm{mod}6$

N _rB ^{max, DL}mean the descending maximum bandwidth that can configure, N _rB ^{max, DL}and N _rB ^dLall that to take continuous 12 subcarriers of frequency domain be unit representation, n _sit is a time slot index in radio frames.

Preferably, said apparatus also comprises:

Mapping block, for by the PRS sequence

be mapped to time slot n according to following formula _sthe modulation symbol a of the subcarrier k that the OFDM symbol of antenna port p=6 is l _{k, l} ^(p)upper, wherein,

$a_{k,l}^{\left(p\right)}=r_{l,n_s}\left(m^{\&prime;}\right):$

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\&CenterDot;c\left(2m\right))+\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="H200910265590XE00011.png,H200910265590XE00031.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{1}{\sqrt{2}}(1-2\&CenterDot;c(2m+1)),m=\mathrm{0,2},...,{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

c(n)＝(x ₁(n+N _C)+x ₂(n+N _C))mod2

x ₁(n+31)＝(x ₁(n+3)+x ₁(n))mod2

x ₂(n+31)＝(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n))mod2，

$m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ Perhaps, $m^{\&prime;}=m+2\&times;(N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}),$ Perhaps,

Wherein, N _c=1600, x ₁(0)=1, x ₁(n)=0, n=1,2 ..., 30, x ₂according to $c_{\mathrm{init}}={\mathrm{\&Sigma;}}_{i=0}^{30}{x}_2\left(i\right)\&CenterDot;2^i$ Produce c _initaccording to following formula, produce:

$c_{\mathrm{init}}=2^{10}\&CenterDot;(7\&CenterDot;(n_s+1)+t+1)\&CenterDot;(2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+1)+2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+N_{\mathrm{CP}},$

Wherein, n _sbe a time slot index in radio frames, t is the index of OFDM symbol in a time slot, and k is the sub-carrier indices on OFDM symbol l, N _iD ^cellthe sign that means community, n _sit is a time slot index in radio frames.

By the present invention, adopting and making the initial physics resource block location of PRS on the OFDM symbol is all even number, has solved in correlation technique due to N _rB ^dL-N _rB ^pRSaffect the problem of the scheduling of PDSCH for odd number causes the PRS skewness, and then guaranteed PRS being uniformly distributed in each RB, reduced the impact on PDSCH, guarantee the overall performance of system.

The accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention the present invention does not form inappropriate limitation of the present invention for explaining.In the accompanying drawings:

Fig. 1 is the schematic diagram according to the LTE system wireless frame structure of correlation technique;

Fig. 2 is the Physical Resource Block schematic diagram of the LTE system that is 5MHz of the system bandwidth according to correlation technique;

Fig. 3 a is the schematic diagram one of reference signal in Physical Resource Block the position publicly-owned according to the LTE system cell of correlation technique;

Fig. 3 b is the schematic diagram two of reference signal in Physical Resource Block the position publicly-owned according to the LTE system cell of correlation technique;

Fig. 4 a is the schematic diagram of PRS position in Physical Resource Block when the systemic circulation prefix is extended cyclic prefix according to correlation technique;

Fig. 4 b is the schematic diagram of PRS position in Physical Resource Block when the systemic circulation prefix is the regular circulation prefix according to correlation technique;

Fig. 5 determines the preferred structured flowchart of device according to the location reference signals frequency domain position of the embodiment of the present invention.

Embodiment

Hereinafter with reference to accompanying drawing, also describe the present invention in detail in conjunction with the embodiments.It should be noted that, in the situation that do not conflict, embodiment and the feature in embodiment in the application can combine mutually.

A kind of location reference signals frequency domain position-confirming method is provided in the present embodiment, for by the location reference signals sequence mapping to physical resource, the method comprises: the initial physics resource block location h that determines location reference signals place on a time domain OFDM symbol according to following expression:

$h=N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ Perhaps,

formula (1)

Wherein, N _rB ^dLthe bandwidth that means downstream arrangements, N _rB ^dLthat to take continuous 12 subcarriers of frequency domain be unit representation, N _rB ^pRSthe PRS bandwidth of high-level signaling configuration,

mean to round downwards.

Preferably, in a subframe, the subcarrier on the time domain OFDM symbol l at location reference signals place is:

When the systemic circulation prefix is the regular circulation prefix:

K=6 (m+2 * h)+(6-l+v _shift) mod6, formula (2-1)

When the systemic circulation prefix is extended cyclic prefix:

K=6 (m+2 * h)+(5-l+v _shift) mod 6, formula (2-2)

Wherein,

$m=\mathrm{0,1},...,2\&CenterDot;N_{\mathrm{RB}}^{\mathrm{PRS}}-1;$

$v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="Cell\; ID\; mod"\; filenames="H200910265590XE00012.png,H200910265590XE00031.png"\; state="\{\{state\}\}">Cell</figure-callout>}}^{\mathrm{ID}}\mathrm{mod}6$

N _rB ^pRSthe PRS bandwidth of high-level signaling configuration, N _rB ^{max, DL}mean the descending maximum bandwidth that can configure, N _rB ^dLthe bandwidth that means downstream arrangements, N _rB ^{max, DL}and N _rB ^dLall that to take continuous 12 subcarriers of frequency domain be unit representation, n _sit is a time slot index in radio frames.

Be multiplied by 2 or round downwards by the calculated value to initial physics resource location h, avoided take 0.5 RB as unit determines its initial physics resource location, can solve in prior art due to N _rB ^dL-N _rB ^pRSaffect the problem of the scheduling of PDSCH for odd number causes the PRS skewness, guaranteed the service system performance.

Preferably, by the PRS sequence

be mapped to according to the following formula time slot n _sthe modulation symbol a of the subcarrier k that the OFDM symbol of antenna port p=6 is l _{k, l} ^(p)it is upper, $a_{k,l}^{\left(p\right)}=r_{l,n_s}\left(m^{\&prime;}\right),$ Have,

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\&CenterDot;c\left(2m\right))+\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="H200910265590XE00011.png,H200910265590XE00031.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{1}{\sqrt{2}}(1-2\&CenterDot;c(2m+1)),$ $m=\mathrm{0,1},...,2\&CenterDot;N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

c(n)＝(x ₁(n+N _C)+x ₂(n+N _C))mod2

x ₁(n+31)＝(x ₁(n+3)+x ₁(n))mod2

x ₂(n+31)＝(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n))mod2，

$m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ Perhaps, $m^{\&prime;}=m+2\&times;(N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}),$ Perhaps,

upper group of formula is formula (3);

Wherein, N _c=1600, x ₁(0)=1, x ₁(n)=0, n=1,2 ..., 30, x ₂according to $c_{\mathrm{init}}={\mathrm{\&Sigma;}}_{i=0}^{30}{x}_2\left(i\right)\&CenterDot;2^i$ Produce .c _initaccording to following formula, produce,

$c_{\mathrm{init}}=2^{10}\&CenterDot;(7\&CenterDot;(n_s+1)+l+1)\&CenterDot;(2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+1)+2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+N_{\mathrm{CP}},$

N _sbe a time slot index in radio frames, t is the index of OFDM symbol in a time slot, and k is the sub-carrier indices on OFDM symbol l, N _rB ^pRSthe PRS bandwidth of high-level signaling configuration, N _iD ^cellthe sign that means community.

It should be noted that, can make

$m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ Perhaps, $m^{\&prime;}=m+2\&times;(N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}),$ But, when $m^{\&prime;}=m+2\&times;(N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}})$ The time, with formula $h=N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ Corresponding, when

the time, with formula

corresponding, can obtain reasonable effect.

Corresponding to above-mentioned explanation, also provide in embodiments of the present invention a kind of location reference signals frequency domain position to determine device, Fig. 5 determines the preferred structured flowchart of device according to the location reference signals frequency domain position of the embodiment of the present invention, as shown in Figure 5, this device comprises the first determination module 52, for carrying out formula (1).Can also comprise module 54 is set, for the value of n, be set to 1.

As shown in Figure 5, this device also comprises: the second determination module 56, for carrying out formula (2-1) or formula (2-2); Mapping block 50, for being shone upon according to formula (3).Above-mentioned formula, carrying out detailed description, does not repeat them here.

Below in conjunction with preferred embodiment, the present embodiment is elaborated.

Embodiment 1

The PRS sequence

according to following formula, define:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\&CenterDot;c\left(2m\right))+\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="H200910265590XE00011.png,H200910265590XE00031.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{1}{\sqrt{2}}(1-2\&CenterDot;c(2m+1)),$ $m=\mathrm{0,1},...,{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

c(n)＝(x ₁(n+N _C)+x ₂(n+N _C))mod2

x ₁(n+31)＝(x ₁(n+3)+x ₁(n))mod2

x ₂(n+31)＝(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n))mod2，

Wherein, N _c=1600, x ₁(0)=1, x ₁(n)=0, n=1,2 ..., 30, x ₂according to $c_{\mathrm{init}}={\mathrm{\&Sigma;}}_{i=0}^{30}{x}_2\left(i\right)\&CenterDot;2^i$ Produce c _initaccording to following formula, produce:

$c_{\mathrm{init}}=2^{10}\&CenterDot;(7\&CenterDot;(n_s+1)+l+1)\&CenterDot;(2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+1)+2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+N_{\mathrm{CP}},$

N _sbe a time slot index in radio frames, t is the index of OFDM symbol in a time slot, and k is the sub-carrier indices on OFDM symbol l, N _rB ^pRSit is the PRS bandwidth of high-level signaling configuration.Pseudo random sequence c (i) produce formula according to as give a definition, N _iD ^cellthe sign that means community.

By the PRS sequence

be mapped to according to the following formula time slot n _sthe modulation symbol a of the subcarrier k that the OFDM symbol of antenna port p=6 is l _{k, l} ^(p)upper:

$a_{k,l}^{\left(p\right)}=r_{l,n_s}\left(m^{\&prime;}\right)$

When the systemic circulation prefix is the regular circulation prefix:

$k=6(m+2\&times;(N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}))+(6-l+v_{\mathrm{shift}})\mathrm{<figure-callout\; id="6"\; label="mod"\; filenames="H200910265590XE00012.png,H200910265590XE00031.png"\; state="\{\{state\}\}">mod</figure-callout>}6$

$m=\mathrm{0,1},...,2\&CenterDot;N_{\mathrm{RB}}^{\mathrm{PRS}}-1$

$m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}$

Perhaps, $m^{\&prime;}=m+2\&times;(N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}})$

When the systemic circulation prefix is extended cyclic prefix:

$k=6(m+2\&times;(N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}))+(5-l+v_{\mathrm{shift}})\mathrm{<figure-callout\; id="6"\; label="mod"\; filenames="H200910265590XE00012.png,H200910265590XE00031.png"\; state="\{\{state\}\}">mod</figure-callout>}6$

$m=\mathrm{0,1},...,2\&CenterDot;N_{\mathrm{RB}}^{\mathrm{PRS}}-1$

$m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}$

Perhaps, $m^{\&prime;}=m+2\&times;(N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}),$

Wherein, $v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="Cell\; ID\; mod"\; filenames="H200910265590XE00012.png,H200910265590XE00031.png"\; state="\{\{state\}\}">Cell</figure-callout>}}^{\mathrm{ID}}\mathrm{mod}6,$ N _rB ^{max, DL}mean the descending maximum bandwidth that can configure, N _rB ^dLthe bandwidth that means downstream arrangements, N _rB ^{max, DL}and N _rB ^dLall that to take continuous 12 subcarriers of frequency domain be unit representation.

Embodiment 2

The PRS sequence according to following formula, define:

$r_{l,n_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\&CenterDot;c\left(2m\right))+\mathrm{<figure-callout\; id="1"\; label="j"\; filenames="H200910265590XE00011.png,H200910265590XE00031.png"\; state="\{\{state\}\}">j</figure-callout>}\frac{1}{\sqrt{2}}(1-2\&CenterDot;c(2m+1)),$ $m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

c(n)＝(x ₁(n+N _C)+x ₂(n+N _C))mod2

x ₁(n+31)＝(x ₁(n+3)+x ₁(n))mod2

x ₂(n+31)＝(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n))mod2，

Wherein, N _c=1600, x ₁(0)=1, x ₁(n)=0, n=1,2 ..., 30, x ₂according to $c_{\mathrm{init}}={\mathrm{\&Sigma;}}_{i=0}^{30}{x}_2\left(i\right)\&CenterDot;2^i$ Produce c _initaccording to following formula, produce:

$c_{\mathrm{init}}=2^{10}\&CenterDot;(7\&CenterDot;(n_s+1)+l+1)\&CenterDot;(2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+1)+2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+N_{\mathrm{CP}},$

N _sbe a time slot index in radio frames, t is the index of OFDM symbol in a time slot, and k is the sub-carrier indices on OFDM symbol l, N _rB ^pRSit is the PRS bandwidth of high-level signaling configuration.Pseudo random sequence c (i) produce formula according to as give a definition, N _iD ^cellthe sign that means community.

By the PRS sequence be mapped to according to the following formula time slot n _sthe modulation symbol a of the subcarrier k that the OFDM symbol of antenna port p=6 is l _{k, l} ^(p)upper:

$a_{k,l}^{\left(p\right)}=r_{l,n_s}\left(m^{\&prime;}\right)$

When the systemic circulation prefix is the regular circulation prefix:

$m=\mathrm{0,1},...,2\&CenterDot;N_{\mathrm{RB}}^{\mathrm{PRS}}-1$

$m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}$

Perhaps, $m^{\&prime;}=m+2\&times;(N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}})$

When the systemic circulation prefix is extended cyclic prefix:

$m=\mathrm{0,1},...,2\&CenterDot;N_{\mathrm{RB}}^{\mathrm{PRS}}-1$

$m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}$

Perhaps,

Wherein, $v_{\mathrm{shift}}=N_{\mathrm{<figure-callout\; id="6"\; label="Cell\; ID\; mod"\; filenames="H200910265590XE00012.png,H200910265590XE00031.png"\; state="\{\{state\}\}">Cell</figure-callout>}}^{\mathrm{ID}}\mathrm{mod}6,$ N _rB ^{max, DL}mean the descending maximum bandwidth that can configure, N _rB ^dLthe bandwidth that means downstream arrangements, N _rB ^{max, DL}and N _rB ^dLall that to take continuous 12 subcarriers of frequency domain be unit representation.

In sum, by the above embodiment of the present invention, provide a kind of location reference signals frequency domain position to determine scheme, guaranteed PRS being uniformly distributed in each RB, reduced the impact on PDSCH, guaranteed the overall performance of system.

Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order be different from herein, perhaps they are made into respectively to each integrated circuit modules, perhaps a plurality of modules in them or step being made into to the single integrated circuit module realizes.Like this, the present invention is not restricted to any specific hardware and software combination.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (7)

1. a location reference signals frequency domain position-confirming method, is characterized in that, comprising:

Determine the initial physics resource block location h of location reference signals PRS on time domain orthogonal frequency division multiplex OFDM symbol according to following formula:

perhaps,

wherein,

the bandwidth that means downstream arrangements,

to take continuous 12 subcarriers of frequency domain to be meaned as unit, the bandwidth of described PRS, wherein, mean to round downwards.

2. method according to claim 1, is characterized in that, according to following formula, determines the subcarrier k on the time domain OFDM symbol l at PRS place described in a subframe:

When the systemic circulation prefix is the regular circulation prefix:

k=6(m+2×h)+(6-l+V _shift)mod6

When the systemic circulation prefix is extended cyclic prefix:

k=6(m+2×h)+(5-l+v _shift)mod6

Wherein,

$m=\mathrm{0,1},...,2\&CenterDot;N_{\mathrm{RB}}^{\mathrm{PRS}}-1;$

$v_{\mathrm{shift}}=N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}6$

N _sit is a time slot index in radio frames.

3. method according to claim 1 and 2, is characterized in that, according to following formula by described PRS sequence

(m) be mapped to time slot n _sthe modulation symbol of the subcarrier k that the OFDM symbol of antenna port p=6 is l

upper, wherein,

$r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\&CenterDot;c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\&CenterDot;c(2m+1)),m=\mathrm{0,1},...{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

c(n)=(x ₁(n+N _C)+x ₂(n+N _C))mod2

x ₁(n+31)-(x ₁(n+3)x ₁(n))mod2

x ₂(n+31)=(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n))mod2,

$m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ Perhaps, $m^{\&prime;}=m+2\&times;(N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}),$ Perhaps,

Wherein, N _c=1600, x ₁(0)=1, x ₁(n)=0, n=1,2 ..., 30, x ₂according to produce,

mean the descending maximum bandwidth that can configure,

that to take continuous 12 subcarriers of frequency domain be unit representation, c _initaccording to following formula, produce:

$c_{\mathrm{init}}=2^{10}\&CenterDot;(7\&CenterDot;(n_s+1)+t+1)\&CenterDot;(2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+1)+2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+N_{\mathrm{CP}},$

Wherein, n _sbe a time slot index in radio frames, t is the index of OFDM symbol in a time slot, and k is the sub-carrier indices on OFDM symbol l, the sign that means community, n _sit is a time slot index in radio frames.

4. method according to claim 1 and 2, is characterized in that, also comprises:

According to described initial physics resource block location h, described PRS is mapped on physical resource.

5. a location reference signals frequency domain position is determined device, it is characterized in that, comprising:

The first determination module, for determine the initial physics resource block location h of location reference signals PRS on time domain orthogonal frequency division multiplex OFDM symbol according to following formula:

perhaps,

wherein,

the bandwidth that means downstream arrangements,

to take continuous 12 subcarriers of frequency domain to be meaned as unit,

it is the bandwidth of described PRS.

6. device according to claim 5, is characterized in that, also comprises:

The second determination module, for determine the subcarrier k on the time domain OFDM symbol l at PRS place described in a subframe according to following formula:

When the systemic circulation prefix is the regular circulation prefix:

k=6(m+2×h)+(6-l+v _shift)mod6

When the systemic circulation prefix is extended cyclic prefix:

k=6(n+2×h)+(5-l+v _shift)mod6

Wherein,

$m=\mathrm{0,1},...,2\&CenterDot;N_{\mathrm{RB}}^{\mathrm{PRS}}-1;$

$v_{\mathrm{shift}}=N_{\mathrm{ID}}^{\mathrm{cell}}\mathrm{mod}6$

N _sit is a time slot index in radio frames.

7. according to the described device of claim 5 or 6, it is characterized in that, also comprise:

Mapping block, for by the PRS sequence

be mapped to time slot n according to following formula _sthe modulation symbol of the subcarrier k that the OFDM symbol of antenna port p=6 is l upper, wherein, $a_{k,l}^{\left(p\right)}=r_{{l,n}_s}\left(m^{\&prime;}\right):$

$r_{{l,n}_s}\left(m\right)=\frac{1}{\sqrt{2}}(1-2\&CenterDot;c\left(2m\right))+j\frac{1}{\sqrt{2}}(1-2\&CenterDot;c(2m+1)),m=\mathrm{0,1},...{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

c(n)=(x ₁(n+N _C)+x ₂(n+N _C))mod2

x ₁(n+31)=(x ₁(n+3)+x ₁(n))mod2

x ₂(n+31)=(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n))mod2,

$m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ Perhaps, $m^{\&prime;}=m+2\&times;(N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}}),$ Perhaps,

Wherein, N _c=1600, x ₁(0)=1, x ₁(n)=0, n=1,2 .., 30, x ₂according to

produce, mean the descending maximum bandwidth that can configure, that to take continuous 12 subcarriers of frequency domain be unit representation, c _initaccording to following formula, produce:

$c_{\mathrm{init}}=2^{10}\&CenterDot;(7\&CenterDot;(n_s+1)+t+1)\&CenterDot;(2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+1)+2\&CenterDot;N_{\mathrm{ID}}^{\mathrm{cell}}+N_{\mathrm{CP}},$

Wherein, n _sbe a time slot index in radio frames, t is the index of OFDM symbol in a time slot, and k is the sub-carrier indices on OFDM symbol l,

the sign that means community, n _sit is a time slot index in radio frames.

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