CN101778068A - 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

Method and device for determining frequency domain position of positioning reference signal

Technical Field

The invention relates to the field of communication, in particular to a method and a device for determining the frequency domain position of a positioning reference signal.

Background

Orthogonal Frequency Division Multiplexing (OFDM) technology is essentially a multi-carrier modulation communication technology, which is one of the core technologies in fourth generation mobile communication. In order to overcome the frequency selective fading characteristic, the channel is divided into a plurality of sub-channels in the frequency domain, the frequency spectrum characteristic of each sub-channel is approximately flat, and the sub-channels of the OFDM are orthogonal to each other, so that the frequency spectrums of the sub-channels are allowed to overlap with each other, and the frequency spectrum resources can be utilized to a large extent.

The Long Term Evolution (LTE) system is an important project for the third generation partnership. Fig. 1 is a diagram illustrating a radio frame structure of an LTE system according to the related art, in a Frequency Division Duplex (FDD) mode of the LTE system, a 10ms radio frame (radio frame) is composed of twenty slots (slots) with a length of 0.5ms and numbering ranges from 0 to 19, and slots 2i and 2i +1 are composed of subframes (subframes) i with a length of 1 ms. When the system adopts the normal cyclic prefix, a time slot comprises uplink/downlink symbols with the length of 7, and when the system adopts the extended cyclic prefix, a time slot comprises uplink/downlink symbols with the length of 6. Fig. 2 is a schematic diagram of a physical Resource Block of an LTE system with a system bandwidth of 5MHz according to the related art, and as shown in fig. 2, one Resource Element (RE) is one subcarrier in one OFDM symbol, and one downlink Resource Block (RB) is composed of 12 consecutive subcarriers and 7 consecutive (6 when a cyclic prefix is extended) OFDM symbols, and is 180kHz in a frequency domain and a time length of one general slot in a time domain. In resource allocation, allocation is performed by using resource blocks as basic units.

The LTE system supports Multiple Input Multiple Output (MIMO) applications with 4 antennas, and the corresponding antenna ports #0, #1, #2, and #3 use full-bandwidth Cell-specific reference signals (CRS), where when the cyclic prefix is a normal cyclic prefix, the positions of the common reference signals in the physical resource block are shown in fig. 3a, and when the cyclic prefix is an extended cyclic prefix, the positions of the common reference signals in the physical resource block are shown in fig. 3 b.

In addition, there is also a user-specific reference signal (UE-specific reference signals), which is transmitted only at a time-frequency domain position where a user-specific physical shared channel (PDSCH) is located, where the cell-common reference signal function includes downlink channel quality measurement and downlink channel estimation (demodulation), and an initial position of the cell-common reference signal in the physical resource block is a downlink channel quality measurement and downlink channel estimation (demodulation), where the initial position of the cell-common reference signal in the 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 is_ID ^cellIndicating the identity of the cell. The common reference signals of the adjacent cells are different through cell planning, so that the purpose of reducing the interference of the adjacent cells is achieved.

A base station needs to measure a location of a terminal (User Equipment, abbreviated as UE) in a cell, so as to perform effective configuration and scheduling on the UE, and currently, the measurement of the terminal by using a CRS reference signal has the following limitations:

each frame of a CRS sequence is repeated, and the cross correlation is poor;

when two antennas transmit, the maximum multiplexing factor is 3, and the interference between adjacent cells is large;

CRS power semi-static configuration and positioning performance limitation.

Currently, a solution to solve the above problem is to transmit a Positioning Reference Signal (PRS) for positioning, so as to ensure the positioning accuracy of the UE, where a transmission period of the PRS is 160ms, 320ms, 640ms, and 1280ms, and a number of consecutive subframes transmitted by the PRS is 1, 2, 4, and 6.

PRS sequences

Defined according to the following formula:

<math><mrow><msub><mi>r</mi><mrow><mi>l</mi><mo>,</mo><msub><mi>n</mi><mi>s</mi></msub></mrow></msub><mrow><mo>(</mo><mi>m</mi><mo>)</mo></mrow><mo>=</mo><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>&CenterDot;</mo><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>m</mi><mo>)</mo></mrow><mo>)</mo></mrow><mo>+</mo><mi>j</mi><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>&CenterDot;</mo><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>m</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>)</mo></mrow><mo>,</mo></mrow></math> $m=\mathrm{0,1},...,{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

c(n)＝(x₁(n+N_C)+x₂(n+N_C))mod2

x₁(n+31)＝(x₁(n+3)+x₁(n))mod2

x₂(n+31)＝(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod2，

wherein N is_C＝1600，x₁(0)＝1，x₁(n)＝0，n＝1，2，...，30，x₂According to <math><mrow><msub><mi>c</mi><mi>init</mi></msub><mo>=</mo><msubsup><mi>&Sigma;</mi><mrow><mi>i</mi><mo>=</mo><mn>0</mn></mrow><mn>30</mn></msubsup><msub><mi>x</mi><mn>2</mn></msub><mrow><mo>(</mo><mi>i</mi><mo>)</mo></mrow><mo>&CenterDot;</mo><msup><mn>2</mn><mi>i</mi></msup></mrow></math> Generation of c_initGenerated according to the following formula:

<math><mrow><msub><mi>c</mi><mi>init</mi></msub><mo>=</mo><msup><mn>2</mn><mn>10</mn></msup><mo>&CenterDot;</mo><mrow><mo>(</mo><mn>7</mn><mo>&CenterDot;</mo><mrow><mo>(</mo><msub><mi>n</mi><mi>s</mi></msub><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo><mi>l</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>&CenterDot;</mo><mrow><mo>(</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>ID</mi><mi>cell</mi></msubsup><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>ID</mi><mi>cell</mi></msubsup><mo>+</mo><msub><mi>N</mi><mi>CP</mi></msub><mo>,</mo></mrow></math>

wherein n is_sIs the index of a slot in a radio frame, l is the index of an OFDM symbol in a slot, k is the index of a subcarrier on the OFDM symbol l, N_RB ^PRSIs the PRS bandwidth configured for higher layer signaling. The pseudo-random sequence c (i) can be generated according to the above formula, N_ID ^cellIndicating the identity of the cell.

PRS sequence

Mapping to a time slot n according to the following formula_sModulation symbol a of subcarrier k of which antenna port p is 6 and OFDM symbol is l_k，l ^(p)The method comprises the following steps:

<math><mrow><msubsup><mi>a</mi><mrow><mi>k</mi><mo>,</mo><mi>l</mi></mrow><mrow><mo>(</mo><mi>p</mi><mo>)</mo></mrow></msubsup><mo>=</mo><msub><mi>r</mi><mrow><mi>l</mi><mo>,</mo><msub><mi>n</mi><mi>s</mi></msub></mrow></msub><mrow><mo>(</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>)</mo></mrow></mrow></math>

when the system cyclic prefix is a normal cyclic prefix:

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

<math><mrow><mi>m</mi><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>-</mo><mn>1</mn></mrow></math>

<math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup></mrow></math>

when the system cyclic prefix is an extended cyclic prefix:

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

<math><mrow><mi>m</mi><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>-</mo><mn>1</mn></mrow></math>

<math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup></mrow></math>

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，DLrepresents the maximum bandwidth that can be configured downstream, N_RB ^DLIndicating the bandwidth of the downstream configuration, N_RB ^max，DLAnd N_RB ^DLAre all expressed by taking 12 continuous subcarriers in the frequency domain as units, and the time-frequency position of the PRS in the physical resource block is shown in fig. 4a and fig. 4 b.

When N is present_RB ^DL-N_RB ^PRSWhen the number of the positioning reference signals PRS is odd, the starting physical resource block position h of the positioning reference signals PRS on the time domain orthogonal frequency division multiplexing OFDM symbol is according to $h=(N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}})/2,$ Due to N_RB ^DL-N_RB ^PRSThe number of the PRSs is an odd number, and the starting Physical resource block position is determined by taking 0.5 RB as a unit at this time, so that only one PRS is located in the first PRB and the last PRB where the PRS is located on one PRS time domain OFDM symbol, and two PRSs are located in the PRBs where other PRSs are located, which may cause the distribution of PRSs to be uneven, and in addition, since the resource allocation of a Physical downlink shared channel (PDSCH for short) is performed by taking a resource block as a unit, this also affects the scheduling of the PDSCH, which causes the system to be scheduledThe overall performance is degraded.

Disclosure of Invention

It is a primary object of the present invention to provide a positioning reference signal frequency domain position determination scheme to solve at least the above problems.

According to an aspect of the present invention, there is provided a method for determining a frequency domain position of a positioning reference signal, including: determining a starting physical resource block position h of a positioning reference signal PRS on a time domain Orthogonal Frequency Division Multiplexing (OFDM) symbol according to the following formula: $h=N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ or,

wherein N is_RB ^DLIndicating the bandwidth of the downstream configuration, N_RB ^DLExpressed in units of 12 subcarriers in succession in the frequency domain, N_RB ^PRSIs the bandwidth of the PRS, wherein,

indicating a rounding down.

Preferably, the subcarrier k on the time domain OFDM symbol l where the PRS is located in one subframe is determined according to the following formula: when the system cyclic prefix is a normal cyclic prefix:

k＝6(m+2×h)+(6-l+v_shift)mod6

when the system cyclic prefix is an extended cyclic prefix:

k＝6(m+2×h)+(5-l+v_shift)mod 6

wherein,

<math><mrow><mi>m</mi><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>-</mo><mn>1</mn><mo>;</mo></mrow></math>

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

N_RB ^max，DLrepresents the maximum bandwidth that can be configured downstream, N_RB ^max，DLAnd N_RB ^DLAre all expressed by taking 12 continuous subcarriers in the frequency domain as a unit, n_sIs the slot index in one radio frame.

Preferably, the PRS sequence is determined according to the following formula

Mapping to a time slot n_sModulation symbol a of subcarrier k of which antenna port p is 6 and OFDM symbol is l_k，l ^(p)The method of the above, wherein,

<math><mrow><msubsup><mi>a</mi><mrow><mi>k</mi><mo>,</mo><mi>l</mi></mrow><mrow><mo>(</mo><mi>p</mi><mo>)</mo></mrow></msubsup><mo>=</mo><msub><mi>r</mi><mrow><mi>l</mi><mo>,</mo><msub><mi>n</mi><mi>s</mi></msub></mrow></msub><mrow><mo>(</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>)</mo></mrow><mo>:</mo></mrow></math>

<math><mrow><msub><mi>r</mi><mrow><mi>l</mi><mo>,</mo><msub><mi>n</mi><mi>s</mi></msub></mrow></msub><mrow><mo>(</mo><mi>m</mi><mo>)</mo></mrow><mo>=</mo><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>&CenterDot;</mo><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>m</mi><mo>)</mo></mrow><mo>)</mo></mrow><mo>+</mo><mi>j</mi><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>&CenterDot;</mo><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>m</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>)</mo></mrow><mo>,</mo></mrow></math> $m=\mathrm{0,1},...,{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

c(n)＝(x₁(n+N_C)+x₂(n+N_C))mod2

x₁(n+31)＝(x₁(n+3)+x₁(n))mod2

x₂(n+31)＝(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod2，

<math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>,</mo></mrow></math> or, <math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><mn>2</mn><mo>&times;</mo><mrow><mo>(</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>)</mo></mrow><mo>,</mo></mrow></math> or,

wherein N is_C＝1600，x₁(0)＝1，x₁(n)＝0，n＝1，2，...，30，x₂According to <math><mrow><msub><mi>c</mi><mi>init</mi></msub><mo>=</mo><msubsup><mi>&Sigma;</mi><mrow><mi>i</mi><mo>=</mo><mn>0</mn></mrow><mn>30</mn></msubsup><msub><mi>x</mi><mn>2</mn></msub><mrow><mo>(</mo><mi>i</mi><mo>)</mo></mrow><mo>&CenterDot;</mo><msup><mn>2</mn><mi>i</mi></msup></mrow></math> Generation of c_initGenerated according to the following equation:

<math><mrow><msub><mi>c</mi><mi>init</mi></msub><mo>=</mo><msup><mn>2</mn><mn>10</mn></msup><mo>&CenterDot;</mo><mrow><mo>(</mo><mn>7</mn><mo>&CenterDot;</mo><mrow><mo>(</mo><msub><mi>n</mi><mi>s</mi></msub><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo><mi>t</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>&CenterDot;</mo><mrow><mo>(</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>ID</mi><mi>cell</mi></msubsup><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>ID</mi><mi>cell</mi></msubsup><mo>+</mo><msub><mi>N</mi><mi>CP</mi></msub><mo>,</mo></mrow></math>

wherein n is_sIs the slot index in a radio frame, t is the index of the OFDM symbol in a slot, k is the subcarrier index on OFDM symbol l, N_ID ^cellDenotes the identity of the cell, n_sIs the slot index in one radio frame.

Preferably, the method further comprises: and mapping the PRS on a physical resource according to the starting physical resource block position h.

According to another aspect of the present invention, there is also provided a positioning reference signal frequency domain position determining apparatus, including: a first determining module, configured to determine a starting physical resource block position h of a positioning reference signal PRS on a time domain orthogonal frequency division multiplexing, OFDM, symbol according to the following formula: $h=N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ or,

wherein N is_RB ^DLIndicating the bandwidth of the downstream configuration, N_RB ^DLExpressed in units of 12 subcarriers in succession in the frequency domain, N_RB ^PRSIs the bandwidth of the PRS.

Preferably, the above apparatus further comprises: a second determining module, configured to determine a subcarrier k on a time domain OFDM symbol l where the PRS is located in one subframe according to the following formula:

when the system cyclic prefix is a normal cyclic prefix:

k＝6(m+2×h)+(6-l+v_shift)mod6

when the system cyclic prefix is an extended cyclic prefix:

k＝6(m+2×h)+(5-l+v_shift)mod6

wherein,

<math><mrow><mi>m</mi><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>-</mo><mn>1</mn><mo>;</mo></mrow></math>

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

N_RB ^max，DLrepresents the maximum bandwidth that can be configured downstream, N_RB ^max，DLAnd N_RB ^DLAre all expressed by taking 12 continuous subcarriers in the frequency domain as a unit, n_sIs the slot index in one radio frame.

Preferably, the above apparatus further comprises:

a mapping module for mapping the PRS sequence

Mapping to a slot n according to the following formula_sModulation symbol a of subcarrier k of which antenna port p is 6 and OFDM symbol is l_k，l ^(p)To above, itIn (1),

<math><mrow><msubsup><mi>a</mi><mrow><mi>k</mi><mo>,</mo><mi>l</mi></mrow><mrow><mo>(</mo><mi>p</mi><mo>)</mo></mrow></msubsup><mo>=</mo><msub><mi>r</mi><mrow><mi>l</mi><mo>,</mo><msub><mi>n</mi><mi>s</mi></msub></mrow></msub><mrow><mo>(</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>)</mo></mrow><mo>:</mo></mrow></math>

<math><mrow><msub><mi>r</mi><mrow><mi>l</mi><mo>,</mo><msub><mi>n</mi><mi>s</mi></msub></mrow></msub><mrow><mo>(</mo><mi>m</mi><mo>)</mo></mrow><mo>=</mo><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>&CenterDot;</mo><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>m</mi><mo>)</mo></mrow><mo>)</mo></mrow><mo>+</mo><mi>j</mi><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>&CenterDot;</mo><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>m</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>)</mo></mrow><mo>,</mo><mi>m</mi><mo>=</mo><mn>0,2</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><msubsup><mrow><mn>2</mn><mi>N</mi></mrow><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><mn>1</mn></mrow></math>

c(n)＝(x₁(n+N_C)+x₂(n+N_C))mod2

x₁(n+31)＝(x₁(n+3)+x₁(n))mod2

x₂(n+31)＝(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod2，

<math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>,</mo></mrow></math> or, <math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><mn>2</mn><mo>&times;</mo><mrow><mo>(</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>)</mo></mrow><mo>,</mo></mrow></math> or,

wherein N is_C＝1600，x₁(0)＝1，x₁(n)＝0，n＝1，2，...，30，x₂According to <math><mrow><msub><mi>c</mi><mi>init</mi></msub><mo>=</mo><msubsup><mi>&Sigma;</mi><mrow><mi>i</mi><mo>=</mo><mn>0</mn></mrow><mn>30</mn></msubsup><msub><mi>x</mi><mn>2</mn></msub><mrow><mo>(</mo><mi>i</mi><mo>)</mo></mrow><mo>&CenterDot;</mo><msup><mn>2</mn><mi>i</mi></msup></mrow></math> Generation of c_initGenerated according to the following equation:

<math><mrow><msub><mi>c</mi><mi>init</mi></msub><mo>=</mo><msup><mn>2</mn><mn>10</mn></msup><mo>&CenterDot;</mo><mrow><mo>(</mo><mn>7</mn><mo>&CenterDot;</mo><mrow><mo>(</mo><msub><mi>n</mi><mi>s</mi></msub><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo><mi>t</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>&CenterDot;</mo><mrow><mo>(</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>ID</mi><mi>cell</mi></msubsup><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>ID</mi><mi>cell</mi></msubsup><mo>+</mo><msub><mi>N</mi><mi>CP</mi></msub><mo>,</mo></mrow></math>

wherein n is_sIs the slot index in a radio frame, t is the index of the OFDM symbol in a slot, k is the subcarrier index on OFDM symbol l, N_ID ^cellDenotes the identity of the cell, n_sIs the slot index in one radio frame.

By adopting the invention, the positions of the starting physical resource blocks of the PRS on the OFDM symbol are all even numbers, thereby solving the problem that N is caused in the related technology_RB ^DL-N_RB ^PRSThe scheduling of the PDSCH is affected by the uneven distribution of PRSs due to odd numbers, so that the uniform distribution of PRSs in each RB is ensured, the influence on the PDSCH is reduced, and the overall performance of the system is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic diagram of a radio frame structure of an LTE system according to the related art;

fig. 2 is a schematic diagram of physical resource blocks of an LTE system having a system bandwidth of 5MHz according to the related art;

fig. 3a is a diagram illustrating a location of a reference signal common to cells of an LTE system in a physical resource block according to the related art;

FIG. 3b is a diagram of a location of a reference signal common to cells of an LTE system in a physical resource block according to the related art;

FIG. 4a is a diagram illustrating a position of a PRS in a physical resource block when a system cyclic prefix is an extended cyclic prefix, according to the related art;

FIG. 4b is a diagram illustrating a position of a PRS in a physical resource block when a system cyclic prefix is a normal cyclic prefix according to the related art;

fig. 5 is a block diagram of a preferred structure of a positioning reference signal frequency domain position determining apparatus according to an embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

In this embodiment, a method for determining a frequency domain position of a positioning reference signal is provided, where the method is used to map a positioning reference signal sequence onto a physical resource, and the method includes: determining the initial physical resource block position h where the positioning reference signal is located on one time domain OFDM symbol according to the following expression:

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

formula (1)

Wherein N is_RB ^DLIndicating the bandwidth of the downstream configuration, N_RB ^DLExpressed in units of 12 subcarriers in succession in the frequency domain, N_RB ^PRSIs the PRS bandwidth configured for higher layer signaling,

indicating a rounding down.

Preferably, the subcarriers on the time domain OFDM symbol l where the positioning reference signal is located in one subframe are:

when the system cyclic prefix is a normal cyclic prefix:

k＝6(m+2×h)+(6-l+v_shift) mod6, equation (2-1)

When the system cyclic prefix is an extended cyclic prefix:

k＝6(m+2×h)+(5-l+v_shift) mod6, equation (2-2)

Wherein,

<math><mrow><mi>m</mi><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>-</mo><mn>1</mn><mo>;</mo></mrow></math>

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

N_RB ^PRSPRS Bandwidth, N, being a higher layer Signaling configuration_RB ^max，DLIndicating maximum band configurable downstreamWidth, N_RB ^DLIndicating the bandwidth of the downstream configuration, N_RB ^max，DLAnd N_RB ^DLAre all expressed by taking 12 continuous subcarriers in the frequency domain as a unit, n_sIs the slot index in one radio frame.

The calculation value of the starting physical resource position h is multiplied by 2 or rounded down, so that the starting physical resource position is prevented from being determined by taking 0.5 RB as a unit, and the problem that N is generated in the prior art can be solved_RB ^DL-N_RB ^PRSThe scheduling of the PDSCH is affected by the uneven distribution of PRSs due to odd numbers, and the system performance is ensured.

Preferably, the PRS sequence is divided into two parts

Mapping to slot n as follows_sModulation symbol a of subcarrier k of which antenna port p is 6 and OFDM symbol is l_k，l ^(p)In the above-mentioned manner, <math><mrow><msubsup><mi>a</mi><mrow><mi>k</mi><mo>,</mo><mi>l</mi></mrow><mrow><mo>(</mo><mi>p</mi><mo>)</mo></mrow></msubsup><mo>=</mo><msub><mi>r</mi><mrow><mi>l</mi><mo>,</mo><msub><mi>n</mi><mi>s</mi></msub></mrow></msub><mrow><mo>(</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>)</mo></mrow><mo>,</mo></mrow></math> the method comprises the following steps of (1) preparing,

<math><mrow><msub><mi>r</mi><mrow><mi>l</mi><mo>,</mo><msub><mi>n</mi><mi>s</mi></msub></mrow></msub><mrow><mo>(</mo><mi>m</mi><mo>)</mo></mrow><mo>=</mo><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>&CenterDot;</mo><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>m</mi><mo>)</mo></mrow><mo>)</mo></mrow><mo>+</mo><mi>j</mi><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>&CenterDot;</mo><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>m</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>)</mo></mrow><mo>,</mo></mrow></math> <math><mrow><mi>m</mi><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><mn>1</mn></mrow></math>

c(n)＝(x₁(n+N_C)+x₂(n+N_C))mod2

x₁(n+31)＝(x₁(n+3)+x₁(n))mod2

x₂(n+31)＝(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod2，

<math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>,</mo></mrow></math> or, <math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><mn>2</mn><mo>&times;</mo><mrow><mo>(</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>)</mo></mrow><mo>,</mo></mrow></math> or,

the formula in the upper group is formula (3);

wherein N is_C＝1600，x₁(0)＝1，x₁(n)＝0，n＝1，2，...，30，x₂According to <math><mrow><msub><mi>c</mi><mi>init</mi></msub><mo>=</mo><msubsup><mi>&Sigma;</mi><mrow><mi>i</mi><mo>=</mo><mn>0</mn></mrow><mn>30</mn></msubsup><msub><mi>x</mi><mn>2</mn></msub><mrow><mo>(</mo><mi>i</mi><mo>)</mo></mrow><mo>&CenterDot;</mo><msup><mn>2</mn><mi>i</mi></msup></mrow></math> Production of_initProduced according to the following formula,

<math><mrow><msub><mi>c</mi><mi>init</mi></msub><mo>=</mo><msup><mn>2</mn><mn>10</mn></msup><mo>&CenterDot;</mo><mrow><mo>(</mo><mn>7</mn><mo>&CenterDot;</mo><mrow><mo>(</mo><msub><mi>n</mi><mi>s</mi></msub><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo><mi>l</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>&CenterDot;</mo><mrow><mo>(</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>ID</mi><mi>cell</mi></msubsup><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>ID</mi><mi>cell</mi></msubsup><mo>+</mo><msub><mi>N</mi><mi>CP</mi></msub><mo>,</mo></mrow></math>

n_sis the slot index in a radio frame, t is the index of the OFDM symbol in a slot, k is the subcarrier index on OFDM symbol l, N_RB ^PRSPRS Bandwidth, N, being a higher layer Signaling configuration_ID ^cellIndicating the identity of the cell.

It is noted that

<math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>,</mo></mrow></math> Or, <math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><mn>2</mn><mo>&times;</mo><mrow><mo>(</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>)</mo></mrow><mo>,</mo></mrow></math> however, when <math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><mn>2</mn><mo>&times;</mo><mrow><mo>(</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>)</mo></mrow></mrow></math> Time, and formula $h=N_{\mathrm{RB}}^{\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{PRS}},$ In response, whenTime, and formula

Accordingly, a relatively good effect can be obtained.

In correspondence with the above description, there is also provided a positioning reference signal frequency domain position determining apparatus in the embodiment of the present invention, and fig. 5 is a block diagram of a preferred structure of the positioning reference signal frequency domain position determining apparatus according to the embodiment of the present invention, as shown in fig. 5, the apparatus includes a first determining module 52 for executing formula (1). A setting module 54 may also be included for setting the value of n to 1.

As shown in fig. 5, the apparatus further includes: a second determination module 56 for executing the formula (2-1) or the formula (2-2); and a mapping module 50 for mapping according to the formula (3). The above formula has already been described in detail, and is not described herein again.

The present embodiment will be described in detail with reference to preferred examples.

Example 1

PRS sequencesDefined according to the following formula:

<math><mrow><msub><mi>r</mi><mrow><mi>l</mi><mo>,</mo><msub><mi>n</mi><mi>s</mi></msub></mrow></msub><mrow><mo>(</mo><mi>m</mi><mo>)</mo></mrow><mo>=</mo><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>&CenterDot;</mo><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>m</mi><mo>)</mo></mrow><mo>)</mo></mrow><mo>+</mo><mi>j</mi><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>&CenterDot;</mo><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>m</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>)</mo></mrow><mo>,</mo></mrow></math> $m=\mathrm{0,1},...,{2N}_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

c(n)＝(x₁(n+N_C)+x₂(n+N_C))mod2

x₁(n+31)＝(x₁(n+3)+x₁(n))mod2

x₂(n+31)＝(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod2，

wherein N is_C＝1600，x₁(0)＝1，x₁(n)＝0，n＝1，2，...，30，x₂According to <math><mrow><msub><mi>c</mi><mi>init</mi></msub><mo>=</mo><msubsup><mi>&Sigma;</mi><mrow><mi>i</mi><mo>=</mo><mn>0</mn></mrow><mn>30</mn></msubsup><msub><mi>x</mi><mn>2</mn></msub><mrow><mo>(</mo><mi>i</mi><mo>)</mo></mrow><mo>&CenterDot;</mo><msup><mn>2</mn><mi>i</mi></msup></mrow></math> Generation of c_initProduced according to the following formula:

<math><mrow><msub><mi>c</mi><mi>init</mi></msub><mo>=</mo><msup><mn>2</mn><mn>10</mn></msup><mo>&CenterDot;</mo><mrow><mo>(</mo><mn>7</mn><mo>&CenterDot;</mo><mrow><mo>(</mo><msub><mi>n</mi><mi>s</mi></msub><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo><mi>l</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>&CenterDot;</mo><mrow><mo>(</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>ID</mi><mi>cell</mi></msubsup><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>ID</mi><mi>cell</mi></msubsup><mo>+</mo><msub><mi>N</mi><mi>CP</mi></msub><mo>,</mo></mrow></math>

n_sis the slot index in a radio frame, t is the index of the OFDM symbol in a slot, k is the subcarrier index on OFDM symbol l, N_RB ^PRSIs the PRS bandwidth configured for higher layer signaling. The pseudo-random sequence c (i) is generated by the following formula, N_ID ^cellIndicating the identity of the cell.

PRS sequence

Mapping to slot n as follows_sModulation symbol a of subcarrier k of which antenna port p is 6 and OFDM symbol is l_k，l ^(p)The method comprises the following steps:

<math><mrow><msubsup><mi>a</mi><mrow><mi>k</mi><mo>,</mo><mi>l</mi></mrow><mrow><mo>(</mo><mi>p</mi><mo>)</mo></mrow></msubsup><mo>=</mo><msub><mi>r</mi><mrow><mi>l</mi><mo>,</mo><msub><mi>n</mi><mi>s</mi></msub></mrow></msub><mrow><mo>(</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>)</mo></mrow></mrow></math>

when the system cyclic prefix is a normal cyclic prefix:

<math><mrow><mi>k</mi><mo>=</mo><mn>6</mn><mrow><mo>(</mo><mi>m</mi><mo>+</mo><mn>2</mn><mo>&times;</mo><mrow><mo>(</mo><msubsup><mi>N</mi><mi>RB</mi><mi>DL</mi></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>)</mo><mo>)</mo></mrow></mrow><mo>+</mo><mrow><mo>(</mo><mn>6</mn><mo>-</mo><mi>l</mi><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><mn>6</mn></mrow></math>

<math><mrow><mi>m</mi><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>-</mo><mn>1</mn></mrow></math>

<math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup></mrow></math>

or, <math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><mn>2</mn><mo>&times;</mo><mrow><mo>(</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>)</mo></mrow></mrow></math>

when the system cyclic prefix is an extended cyclic prefix:

<math><mrow><mi>k</mi><mo>=</mo><mn>6</mn><mrow><mo>(</mo><mi>m</mi><mo>+</mo><mn>2</mn><mo>&times;</mo><mrow><mo>(</mo><msubsup><mi>N</mi><mi>RB</mi><mi>DL</mi></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>)</mo></mrow><mo>)</mo></mrow><mo>+</mo><mrow><mo>(</mo><mn>5</mn><mo>-</mo><mi>l</mi><mo>+</mo><msub><mi>v</mi><mi>shift</mi></msub><mo>)</mo></mrow><mi>mod</mi><mn>6</mn></mrow></math>

<math><mrow><mi>m</mi><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>-</mo><mn>1</mn></mrow></math>

<math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup></mrow></math>

or, <math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><mn>2</mn><mo>&times;</mo><mrow><mo>(</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>)</mo></mrow><mo>,</mo></mrow></math>

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，DLrepresents the maximum bandwidth that can be configured downstream, N_RB ^DLIndicating the bandwidth of the downstream configuration, N_RB ^max，DLAnd N_RB ^DLAre expressed in units of 12 consecutive subcarriers in the frequency domain.

Example 2

PRS sequences

Defined according to the following formula:

<math><mrow><msub><mi>r</mi><mrow><mi>l</mi><mo>,</mo><msub><mi>n</mi><mi>s</mi></msub></mrow></msub><mrow><mo>(</mo><mi>m</mi><mo>)</mo></mrow><mo>=</mo><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>&CenterDot;</mo><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>m</mi><mo>)</mo></mrow><mo>)</mo></mrow><mo>+</mo><mi>j</mi><mfrac><mn>1</mn><msqrt><mn>2</mn></msqrt></mfrac><mrow><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>&CenterDot;</mo><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>m</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>)</mo></mrow><mo>,</mo></mrow></math> $m=\mathrm{0,1},...,2N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-1$

c(n)＝(x₁(n+N_C)+x₂(n+N_C))mod2

x₁(n+31)＝(x₁(n+3)+x₁(n))mod2

x₂(n+31)＝(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod2，

wherein N is_C＝1600，x₁(0)＝1，x₁(n)＝0，n＝1，2，...，30，x₂According to <math><mrow><msub><mi>c</mi><mi>init</mi></msub><mo>=</mo><msubsup><mi>&Sigma;</mi><mrow><mi>i</mi><mo>=</mo><mn>0</mn></mrow><mn>30</mn></msubsup><msub><mi>x</mi><mn>2</mn></msub><mrow><mo>(</mo><mi>i</mi><mo>)</mo></mrow><mo>&CenterDot;</mo><msup><mn>2</mn><mi>i</mi></msup></mrow></math> Generation of c_initProduced according to the following formula:

<math><mrow><msub><mi>c</mi><mi>init</mi></msub><mo>=</mo><msup><mn>2</mn><mn>10</mn></msup><mo>&CenterDot;</mo><mrow><mo>(</mo><mn>7</mn><mo>&CenterDot;</mo><mrow><mo>(</mo><msub><mi>n</mi><mi>s</mi></msub><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo><mi>l</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>&CenterDot;</mo><mrow><mo>(</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>ID</mi><mi>cell</mi></msubsup><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>ID</mi><mi>cell</mi></msubsup><mo>+</mo><msub><mi>N</mi><mi>CP</mi></msub><mo>,</mo></mrow></math>

n_sis the slot index in a radio frame, t is the index of the OFDM symbol in a slot, k is the subcarrier index on OFDM symbol l, N_RB ^PRSIs the PRS bandwidth configured for higher layer signaling. The pseudo-random sequence c (i) is generated by the following formula, N_ID ^cellIndicating the identity of the cell.

PRS sequence

Mapping to slot n as follows_sModulation symbol a of subcarrier k of which antenna port p is 6 and OFDM symbol is l_k，l ^(p)The method comprises the following steps:

<math><mrow><msubsup><mi>a</mi><mrow><mi>k</mi><mo>,</mo><mi>l</mi></mrow><mrow><mo>(</mo><mi>p</mi><mo>)</mo></mrow></msubsup><mo>=</mo><msub><mi>r</mi><mrow><mi>l</mi><mo>,</mo><msub><mi>n</mi><mi>s</mi></msub></mrow></msub><mrow><mo>(</mo><msup><mi>m</mi><mo>&prime;</mo></msup><mo>)</mo></mrow></mrow></math>

when the system cyclic prefix is a normal cyclic prefix:

<math><mrow><mi>m</mi><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>-</mo><mn>1</mn></mrow></math>

<math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup></mrow></math>

or, <math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><mn>2</mn><mo>&times;</mo><mrow><mo>(</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>)</mo></mrow></mrow></math>

when the system cyclic prefix is an extended cyclic prefix:

<math><mrow><mi>m</mi><mo>=</mo><mn>0,1</mn><mo>,</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>,</mo><mn>2</mn><mo>&CenterDot;</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup><mo>-</mo><mn>1</mn></mrow></math>

<math><mrow><msup><mi>m</mi><mo>&prime;</mo></msup><mo>=</mo><mi>m</mi><mo>+</mo><msubsup><mi>N</mi><mi>RB</mi><mrow><mi>max</mi><mo>,</mo><mi>DL</mi></mrow></msubsup><mo>-</mo><msubsup><mi>N</mi><mi>RB</mi><mi>PRS</mi></msubsup></mrow></math>

or,

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，DLrepresents the maximum bandwidth that can be configured downstream, N_RB ^DLIndicating the bandwidth of the downstream configuration, N_RB ^max，DLAnd N_RB ^DLAre expressed in units of 12 consecutive subcarriers in the frequency domain.

In summary, the embodiments of the present invention provide a positioning reference signal frequency domain position determination scheme, so as to ensure uniform distribution of PRS in each RB, reduce the influence on PDSCH, and ensure the overall performance of the system.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A method for determining the frequency domain position of a positioning reference signal (SRS), comprising:

determining a starting physical resource block position h of a positioning reference signal PRS on a time domain Orthogonal Frequency Division Multiplexing (OFDM) symbol according to the following formula:

or,

wherein,N_RB ^DLindicating the bandwidth of the downstream configuration, N_RB ^DLExpressed in units of 12 subcarriers in succession in the frequency domain, N_RB ^PRSIs the bandwidth of the PRS, wherein,

indicating a rounding down.

2. The method of claim 1, wherein a subcarrier k on a time domain OFDM symbol l where the PRS is located in a subframe is determined according to the following formula:

when the system cyclic prefix is a normal cyclic prefix:

k＝6(m+2×h)+(6-l+v_shift)mod6

when the system cyclic prefix is an extended cyclic prefix:

k＝6(m+2×h)+(5-l+v_shift)mod 6

wherein,

N_RB ^max，DLrepresents the maximum bandwidth that can be configured downstream, N_RB ^max，DLAnd N_RB ^DLAre all expressed by taking 12 continuous subcarriers in the frequency domain as a unit, n_sIs oneSlot index in radio frame.

3. Method according to claim 1 or 2, characterized in that the PRS sequence is defined according to the following formulaMapping to a time slot n_sModulation symbol a of subcarrier k of which antenna port p is 6 and OFDM symbol is l_k，l ^(p)The method of the above, wherein,

c(n)＝(x₁(n+N_C)+x₂(n+N_C))mod2

x₁(n+31)＝(x₁(n+3)+x₁(n))mod2

x₂(n+31)＝(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod2，

or,

or,

wherein N is_C＝1600，x₁(0)＝1，x₁(n)＝0，n＝1，2，...，30，x₂According to

Generation of c_initGenerated according to the following equation:

wherein n is_sIs the slot index in a radio frame, t is the index of the OFDM symbol in a slot, k is the subcarrier index on OFDM symbol l, N_ID ^cellDenotes the identity of the cell, n_sIs the slot index in one radio frame.

4. The method of claim 1 or 2, further comprising:

and mapping the PRS on a physical resource according to the starting physical resource block position h.

5. A positioning reference signal frequency domain position determination apparatus, comprising:

a first determining module, configured to determine a starting physical resource block position h of a positioning reference signal PRS on a time domain orthogonal frequency division multiplexing, OFDM, symbol according to the following formula:

or,

wherein N is_RB ^DLIndicating the bandwidth of the downstream configuration, N_RB ^DLExpressed in units of 12 subcarriers in succession in the frequency domain, N_RB ^PRSIs the bandwidth of the PRS.

6. The apparatus of claim 5, further comprising:

a second determining module, configured to determine a subcarrier k on a time domain OFDM symbol l where the PRS is located in one subframe according to the following formula:

when the system cyclic prefix is a normal cyclic prefix:

k＝6(m+2×h)+(6-l+v_shift)mod6

when the system cyclic prefix is an extended cyclic prefix:

k＝6(m+2×h)+(5-l+v_shift)mod 6

wherein,

N_RB ^max，DLrepresents the maximum bandwidth that can be configured downstream, N_RB ^max，DLAnd N_RB ^DLAre all expressed by taking 12 continuous subcarriers in the frequency domain as a unit, n_sIs the slot index in one radio frame.

7. The apparatus of claim 5 or 6, further comprising:

a mapping module for mapping the PRS sequence

Mapping to a slot n according to the following formula_sModulation symbol a of subcarrier k of which antenna port p is 6 and OFDM symbol is l_k，l ^(p)The method of the above, wherein,

c(n)＝(x₁(n+N_C)+x₂(n+N_C))mod2

x₁(n+31)＝(x₁(n+3)+x₁(n))mod2

x₂(n+31)＝(x₂(n+3)+x₂(n+2)+x₂(n+1)+x₂(n))mod2，

or,

or,

wherein N is_C＝1600，x₁(0)＝1，x₁(n)＝0，n＝1，2，...，30，x₂According to

Generation of c_initGenerated according to the following equation:

wherein n is_sIs the slot index in a radio frame, t is the index of the OFDM symbol in a slot, k is the subcarrier index on OFDM symbol l, N_ID ^cellDenotes the identity of the cell, n_sIs the slot index in one radio frame.

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