# US 2021/0345130 A1 · Positioning reference signal transmission method and apparatus, device, and storage medium

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- Number: US 2021/0345130 A1
- Document ID: US20210345130A1
- Status: Published application
- Kind: A1
- Application number: 17/273,344
- Filed: 2019-09-03
- Published: 2021-11-04
- Earliest claimed: 2018-09-04
- Assignees: Zte Corporation
- Applicants: Zte Corporation
- Inventors: Cheng BI; Shijun CHEN; Dawei CHEN; Yuanyuan WANG
- Web page: https://patentgrep.com/patent/US20210345130A1

## CPC

- H04W 16/28: using beam steering
- H04B 7/0617: {for beam forming}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 27/2613: {Structure of the reference signals}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 64/00: Locating users or terminals {or network equipment} for network management purposes, e.g. mobility management
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Provided are a positioning reference signal (PRS) transmission method and apparatus, and a storage medium. A PRS sending end presets PRS blocks having the same number as the number of shaped beams, a corresponding PRS sequence in each PRS block by using a preset sequence generation rule, and each PRS block containing the corresponding PRS sequence is sent according to a preset sending order of the PRS blocks in a polling manner through a shaped beam corresponding to the each PRS block. A PRS receiving end acquires a first PRS block sent by the PRS sending end; and when the first PRS block contains a block index, a sending index of a shaped beam corresponding to the first PRS block corresponding to the block index is determined according to preset correspondence; or when the first PRS block contains no block index, a sending index of a shaped beam corresponding to the first PRS block is determined according to a preset calculation rule. The sending index of the shaped beam is used for determining a time-domain position of the shaped beam.

## Claims

### Claim 1

A positioning reference signal (PRS) transmission method, applied to a PRS sending end, comprising:
presetting PRS blocks having a same number as a number of shaped beams, and setting a corresponding PRS sequence in each of the PRS blocks by using a preset sequence generation rule; and
sending, through a shaped beam corresponding to each of the PRS blocks, the each of the PRS blocks containing the corresponding PRS sequence in a polling manner according to a preset sending order of the PRS blocks.

### Claim 2 (depends on 1)

The method of claim 1, after presetting the PRS blocks having the same number as the number of shaped beams, further comprising:
setting a block index corresponding to each of the PRS blocks respectively according to the preset sending order.

### Claim 3 (depends on 2)

The method of claim 2, further comprising:
setting the block index on one of a preceding symbol before the PRS sequence or a next symbol after the PRS sequence in each of the PRS blocks, and sending the block index.

### Claim 4 (depends on 2)

The method of claim 2, wherein setting the corresponding PRS sequence in each of the PRS blocks by using the preset sequence generation rule comprises:
using a same PRS sequence or a different PRS sequence for each of the PRS blocks.

### Claim 5 (depends on 4)

The method of claim 4, wherein in a case of using the same PRS sequence for each of the PRS blocks, an expression for generating an initial value of the PRS sequence comprises one of:
cinit=212·(l mod NsymbPRSbeam+1)(2NIDPRS+1)+NIDPRS;
cinit=210·(l mod NsymbPRSbeam+1)(2(NIDPRS/1024)+1)+(NIDPRS/1024);
cinit=210(l mod NsymbPRSbeam+1(2nid+1)+nid;
cinit=212·(14·2μ·└ns,f/(5·2μ)┘+l mod NsymbPRSbeam+1)(2NIDPRS+1)+NIDPRS; or
cinit=213·(l mod NsymbPRSbeam+1)(2NIDPRS+1)+NIDPRS;
in a case of using the different PRS sequence for each of the PRS blocks, an expression for generating an initial value of the PRS sequence comprises one of:
cinit=(212·(14ns,f+l+1)(2NIDPRS+1)+NIDPRS)mod 231;
cinit=(210·(14ns,f+l+1)(2(NIDPRS/1024)+1)+(NIDPRS/1024))mod 231;
cinit=└NIDPRS/1024┘+(210·(14ns,f+l+1)(2(NIDPRS/1024)+1)+(NIDPRS/1024))mod 229;
cinit=(210·(14ns,f+l+1)(2nid+1)+nid)mod 231; or
cinit=212·(7lindexPRSB+l+1)(2NIDPRS++1)+NIDPRS)mod 231;
wherein cinit represents the initial value of the PRS sequence, l represents an index of a symbol in a slot where the PRS sequence is located, NIDPRS represents a PRS serial number, nid represents a scrambling code serial number, and μ has a value range of 0, 1, 2, 3 and 4, nid represents a slot index, lindexPRSB represents a block index, and NsymbPRSbeam represents a number of symbols contained in each of the PRS blocks.

### Claim 6

A positioning reference signal (PRS) transmission method, applied to a PRS receiving end, comprising:
acquiring a first PRS block sent by a PRS sending end; and
in a case where the first PRS block contains a block index, determining a sending index of a shaped beam corresponding to the first PRS block corresponding to the block index according to preset correspondence; or
in a case where the first PRS block contains no block index, determining a sending index of a shaped beam corresponding to the first PRS block according to a preset calculation rule;
wherein the sending index of the shaped beam is used for determining a time-domain position of the shaped beam.

### Claim 7 (depends on 6)

The method of claim 6, wherein determining the sending index of the shaped beam corresponding to the first PRS block according to the preset calculation rule comprises:
distinguishing each received PRS block according to a preset sequence generation rule acquired from the PRS sending end in advance, and determining the sending index of the shaped beam corresponding to the first PRS block according to a position of the first PRS block.

### Claim 8 (depends on 6)

The method of claim 6, further comprising: performing positioning through the following operations:
dividing a time difference of reception between the first PRS block and an acquired second PRS block by a time length of one symbol, and rounding down a divided quotient to obtain a symbol interval value between the sending index of the shaped beam corresponding to the first PRS and a sending index of a shaped beam corresponding to the second PRS block; and
subtracting a product of the symbol interval value and the time length of the one symbol from the time difference of reception between the first PRS block and the second PRS block, and determining a subtracted difference as a time difference of arrival between the first PRS block and the second PRS block.

### Claim 9

A positioning reference signal (PRS) transmission apparatus, configured on a PRS sending end, comprising: a setting module and a sending module, wherein
the setting module is configured to preset PRS blocks having a same number as a number of shaped beams, and set a corresponding PRS sequence in each of the PRS blocks by using a preset sequence generation rule; and
the sending module is configured to send, through a shaped beam corresponding to each of the PRS blocks, the each of the PRS blocks containing the corresponding PRS sequence in a polling manner according to a preset sending order of the PRS blocks.

### Claim 10 (depends on 9)

The apparatus of claim 9, wherein the setting module is further configured to set a block index corresponding to each of the PRS blocks respectively according to the preset sending order after presetting the PRS blocks having the same number as the number of shaped beams.

### Claim 11 (depends on 10)

The apparatus of claim 10, wherein the setting module is further configured to:
set the block index on one of a preceding symbol before the PRS sequence or a next symbol of the PRS sequence after the PRS sequence in each of the PRS blocks, and send the block index.

### Claim 12 (depends on 9)

The apparatus of claim 9, wherein the setting module is further configured to use a same PRS sequence or a different PRS sequence for each of the PRS blocks.

### Claim 13 (depends on 12)

The apparatus of claim 12, wherein the setting module is further configured to:
in a case of each of the PRS blocks using the same PRS sequence, use one of the following expressions for generating an initial value of the PRS sequence:
cinit=212·(l mod NsymbPRSbeam+1)(2NIDPRS+1)+NIDPRS;
cinit=210·(l mod NsymbPRSbeam+1)(2(NIDPRS/1024)+1)+(NIDPRS/1024);
cinit=210(l mod NsymbPRSbeam+1(2nid+1)+nid;
cinit=212·(14·2μ·└ns,f/(5·2μ)┘+l mod NsymbPRSbeam+1)(2NIDPRS+1)+NIDPRS; or
cinit=213·(l mod NsymbPRSbeam+1)(2NIDPRS+1)+NIDPRS; and
in a case of each of the PRS blocks using the different PRS sequence, use one of the following expressions for generating an initial value of the PRS sequence:
cinit=(212·(14ns,f+l+1)(2NIDPRS+1)+NIDPRS)mod 231;
cinit=(210·(14ns,f+l+1)(2(NIDPRS/1024)+1)+(NIDPRS/1024))mod 231;
cinit=└NIDPRS/1024┘+(210·(14ns,f+l+1)(2(NIDPRS/1024)+1)+(NIDPRS/1024))mod 229;
cinit=(210·(14ns,f+l+1)(2nid+1)+nid)mod 231; or
cinit=212·(7lindexPRSB+l+1)(2NIDPRS++1)+NIDPRS)mod 231;
wherein cinit represents the initial value of the PRS sequence, l represents an index of a symbol in a slot where the PRS sequence is located, NIDPRS represents a PRS serial number, nid represents a scrambling code serial number, and μ has a value range of 0, 1, 2, 3 and 4, ns,f represents a slot index, lindexPRSB represents a block index, and NsymbPRSbeam represents a number of symbols contained in each of the PRS blocks.

### Claim 14 (depends on 6)

A positioning reference signal (PRS) transmission apparatus, configured on a PRS receiving end and applied to the method of claim 6, comprising: an acquisition module and a determination module, wherein
the acquisition module is configured to acquire a first PRS block sent by a PRS sending end; and
the determination module is configured to, in a case where the first PRS block contains a block index, determine a sending index of a shaped beam corresponding to the first PRS block corresponding to the block index according to preset correspondence; or in a case where the first PRS block contains no block index, determine a sending index of a shaped beam corresponding to the first PRS block according to a preset calculation rule; wherein the sending index of the shaped beam is used for determining a time-domain position of the shaped beam.

### Claim 15 (depends on 14)

The apparatus of claim 14, wherein the determination module is further configured to:
distinguish each received PRS block according to a preset sequence generation rule acquired from the PRS sending end in advance, and determine the sending index of the shaped beam corresponding to the first PRS block according to a position of the first PRS block.

### Claim 16 (depends on 14)

The apparatus of claim 14, wherein the determination module is further configured to:
divide a time difference of reception between the first PRS block and an acquired second PRS block by a time length of one symbol, and round down a divided quotient to obtain a symbol interval value between the sending index of the shaped beam corresponding to the first PRS and a sending index of a shaped beam corresponding to the second PRS block; and
subtract a product of the symbol interval value and the time length of the one symbol from the time difference of reception between the first PRS block and the second PRS block, and determine a subtracted difference as a time difference of arrival between the first PRS block and the second PRS block.

### Claim 17 (depends on 1)

A computer-readable storage medium, storing a computer program, wherein the computer program, when executed by a processor, implements the method of claim 1.

### Claim 18 (depends on 1)

A positioning reference signal (PRS) transmission device, comprising: a processor and a memory configured to store a computer program executable on the processor,
wherein the processor is configured to, when executing the computer program, implement the method of claim 1.

### Claim 19 (depends on 3)

The method of claim 3, wherein setting the corresponding PRS sequence in each of the PRS blocks by using the preset sequence generation rule comprises:
using a same PRS sequence or a different PRS sequence for each of the PRS blocks.

### Claim 20 (depends on 10)

The apparatus of claim 10, wherein the setting module is further configured to use a same PRS sequence or a different PRS sequence for each of the PRS blocks.