Method and apparatus for performing random access

Patent metadata

Field	Value
Publication number	US-2019364603-A1
Application number	US-201816478460-A
Country	US
Kind code	A1
Filing date	Jan 16, 2018
Priority date	Jan 16, 2017
Publication date	Nov 28, 2019
Grant date	—

Abstract

The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present application discloses a method for generating a random access preamble, comprising the following steps of: receiving random access configuration information, the random access configuration information comprising preamble resource pool information, the preamble resource pool information comprising available base sequences; generating M sequences according to a base sequence, the M being greater than 1; and, generating a random access preamble according to the M sequences. The present application further discloses a device for generating a random access preamble, and a method and device for indicating random access configuration information. With the technical solutions disclosed by the present application, high frequency band multi-beam operations in 5G can be adapted, and the performance of the system in the random access process can be improved.

First claim

1 . A method for operating a terminal in a wireless communication system, the method comprising:
receiving, from a base station, random access configuration information, the random access configuration information comprising preamble resource pool information, the preamble resource pool information comprising a plurality of base sequences; determining a preamble sequence among a plurality of preamble sequences associated with a base sequence among the plurality of base sequences; generating a random access preamble based on the preamble sequence; and transmitting, to the base station, the random access preamble.

2 . The method according to claim 1 , wherein the generating the random access preamble comprises:
generating a plurality of time-domain sequences based on the plurality of preamble sequences and waveform information indicated by the base station; adding a cyclic prefix (CP) before each of the plurality of time-domain sequences; connecting the plurality of time-domain sequences added with the CP end to end; and adding a guard time (GT) at the end of the last sequence.

3 . The method according to claim 1 , further comprising:
based on each cyclic shift parameter in a cyclic shift group among a plurality of cyclic shift groups, obtaining a plurality of intermediate sequences by performing corresponding cyclic shift on the base sequence among the plurality of base sequences; and obtaining the plurality of preamble sequences by processing the plurality of intermediate sequences by using an orthogonal code among a plurality of orthogonal codes, wherein the preamble resource pool information further comprises the plurality of cyclic shift groups and the plurality of orthogonal codes, and wherein a random access preamble identifier comprises at least one of a base sequence identifier, a cyclic shift group index, or an orthogonal code index.

4 . The method according to claim 3 , further comprising:
generating at least one sequence group by processing at least one base sequence among the plurality of base sequences by using at least one cyclic shift group among the plurality of cyclic shift groups and at least one orthogonal code among the plurality of orthogonal codes; and obtaining the plurality of preamble sequences by repeating the at least one sequence group for at least one time, wherein a random access preamble identifier comprises at least one of a base sequence identifier, a cyclic shift group index, or an orthogonal code index.

5 . The method according to claim 3 , further comprising:
multiplying the at least one base sequence by an element of the orthogonal code.

6 . The method according to claim 1 , wherein the base sequence is selected from the plurality of base sequences by the terminal or configured from the plurality of base sequences to the terminal by the base station,
wherein a cyclic shift group used for performing cyclic shift on the base sequence is selected from a plurality of cyclic shift groups by the terminal or configured from the plurality of cyclic shift groups to the terminal by the base station, and wherein an orthogonal code used for processing the base sequence is selected from a plurality of orthogonal codes by the terminal or configured from the plurality of orthogonal codes to the terminal by the base station.

7 . The method according to claim 3 , wherein a cyclic shift parameter in the cyclic shift group is related to a cell identification (ID), and
wherein the cyclic shift group is determined based on at least one of a cyclic shift difference between two sequences, an allowable maximum cyclic shift, an initial cyclic shift, or the cell ID.

8 . (canceled)

9 . A base station in a wireless communication system, the base station comprising:
at least one processor; and a transceiver, operatively coupled to the at least one processor, configured to:
transmit random access configuration information to a terminal, the random access configuration information comprising preamble resource pool information, the preamble resource pool information comprising a plurality of base sequences, and
receive, from the terminal, a random access preamble generated based on a preamble sequence,
wherein the preamble sequence is determined among a plurality of preamble sequences associated with a base sequence among the plurality of base sequences.

10 . The base station according to claim 9 , wherein the resource pool information further comprises cyclic shift groups, and
wherein a parameter in the cyclic shift groups satisfies, after performing cyclic shift on each base sequence by using each cyclic shift group, a first condition that other base sequence among the plurality of base sequences cannot be obtained and a second condition that cyclic shifts between different cyclic shift groups will not be interfered with each other.

11 - 14 . (canceled)

15 . The base station of claim 9 , wherein the preamble resource pool information further comprises a plurality of cyclic shift groups and a plurality of orthogonal codes,
wherein the plurality of preamble sequences are obtained based on processing a plurality of intermediate sequences by using an orthogonal code among the plurality of orthogonal codes, wherein, based on each cyclic shift parameter in a cyclic shift group among the plurality of cyclic shift groups, the plurality of intermediate sequences are obtained by performing corresponding cyclic shift on the base sequence among the plurality of base sequences.

16 . The base station of claim 15 , wherein the transceiver is further configured to transmit a random access response for the random access preamble to the terminal, and
wherein the random access response comprises a base sequence identifier for the base sequence, a cyclic shift group index of the cyclic shift group, and an orthogonal code index of the orthogonal code.

17 . The base station of claim 9 , wherein the base sequence is selected from the plurality of base sequences by the terminal or configured from the plurality of base sequences to the terminal by the base station,
wherein a cyclic shift group used for performing cyclic shift on the base sequence is selected from a plurality of cyclic shift groups by the terminal or configured from the plurality of cyclic shift groups to the terminal by the base station, and wherein an orthogonal code used for processing the base sequence is selected from a plurality of orthogonal codes by the terminal or configured from the plurality of orthogonal codes to the terminal by the base station.

18 . The base station of claim 15 , wherein a cyclic shift parameter in the cyclic shift group is related to a cell identification (ID), and
wherein the cyclic shift group is determined based on at least one of a cyclic shift difference between two sequences, an allowable maximum cyclic shift, an initial cyclic shift, or the cell ID.

19 . A terminal a wireless communication system, the terminal comprising:
a transceiver configured to receive, from a base station, random access configuration information, the random access configuration information comprising preamble resource pool information, the preamble resource pool information comprising a plurality of base sequences; and at least one processor configured to:
determine a preamble sequence among a plurality of preamble sequences associated with a base sequence among the plurality of base sequence, and
generate a random access preamble based on the preamble sequence,
wherein the transceiver is further configured to transmit, to the base station, the random access preamble.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Qian Chen
• Yu Bin
• Xiong Qi
• Zhang Yingjie

Classifications

• H04W74/006

  in the downlink, i.e. towards the terminal · CPC title

• H04L27/2607

  Cyclic extensions · CPC title

• H04J13/12

  Generation of orthogonal codes · CPC title

• H04W56/001

  Synchronization between nodes · CPC title

• H04W74/0833 Primary

  Random access procedures, e.g. with 4-step access · CPC title