Method and apparatus for supporting flexible UE bandwidth in next generation communication system

Patent metadata

Field	Value
Publication number	US-11985547-B2
Application number	US-202318149404-A
Country	US
Kind code	B2
Filing date	Jan 3, 2023
Priority date	Aug 10, 2016
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

A method and a system for supporting flexible user equipment (UE) bandwidth by the UE during a random access are provided. The method includes transmitting, to a base station, a random access preamble over a first bandwidth selected among a plurality of channel bandwidths of the UE, receiving, from the base station, a random access response over a second bandwidth selected among the plurality of channel bandwidths, and transmitting, to the base station, a scheduled transmission message over a third bandwidth selected among the plurality of channel bandwidths of the UE.

First claim

What is claimed is:

1. A method performed by a terminal in a wireless communication system, the method comprising:
transmitting, to a base station, a random access preamble;
receiving, from the base station, a first physical downlink control channel (PDCCH) associated with a random access response (RAR);
receiving, from the base station, the RAR on a physical downlink shared channel (PDSCH) based on the first PDCCH;
transmitting, to the base station, a physical uplink shared channel (PUSCH) scheduled by an uplink grant of the RAR; and
receiving, from the base station, second PDCCH associated with a contention resolution message,
wherein a bandwidth of the first PDCCH for RAR and a bandwidth of the second PDCCH for the contention resolution message is less than or equal to a reception channel bandwidth of the terminal, and
wherein the reception channel bandwidth of the terminal is less than a carrier bandwidth of a serving cell of the base station.

2. The method of claim 1 , further comprising:
receiving, from the base station, a system information block (SIB),
wherein the SIB incudes first information on a first bandwidth part for the first PDCCH, second information on a second bandwidth part for the PUSCH.

3. The method of claim 2 ,
wherein the SIB further includes third information on a frequency resource for the second PDCCH, and
wherein the second PDCCH is monitored based on the frequency resource indicated by the third information.

4. The method of claim 2 ,
wherein the SIB further includes fourth information on a time resource for the first PDCCH for the RAR, and
wherein the first PDCCH is monitored based on the time resource and the first bandwidth part.

5. The method of claim 2 ,
wherein the carrier bandwidth of the serving cell of the base station is divided into a plurality of bandwidth parts, and
wherein the SIB indicates the first bandwidth part and the second bandwidth part among the plurality of bandwidth parts, respectively.

6. The method of claim 5 ,
wherein a bandwidth of a physical random access channel (PRACH), to which the random access preamble is transmitted, is less than a transmission channel bandwidth of the terminal, and
wherein the transmission channel bandwidth of the terminal is less than the carrier bandwidth of the serving cell of the base station.

7. The method of claim 1 , further comprising:
receiving, from the base station, a master information block (MIB) on a broadcast channel (BCH), the MIB including information indicating an offset from a frequency resource for the first PDCCH to a frequency resource in which the BCH is received; and
identifying the offset based on the MIB,
wherein the first PDCCH is received on the frequency resource identified based on the offset.

8. The method of claim 1 , further comprising:
in response to receiving the second PDCCH associated with the contention resolution message, transmitting hybrid automatic repeat request (HARQ) feedback, in case the contention resolution message is successfully decoded,
wherein the second PDCCH associated with the contention resolution message is received based on a temporary cell radio network temporary identifier (TC-RNTI), and
wherein the HARQ feedback is transmitted based on a C-RNTI.

9. A method performed by a base station in a wireless communication system, the method comprising:
receiving, from a terminal, a random access preamble;
transmitting, to the terminal, a first physical downlink control channel (PDCCH) associated with a random access response (RAR);
transmitting, to the terminal, the RAR on a physical downlink shared channel (PDSCH) based on the first PDCCH;
receiving, from the terminal, a physical uplink shared channel (PUSCH) scheduled by an uplink grant of the RAR; and
transmitting, to the terminal, second PDCCH associated with a contention resolution message,
wherein a bandwidth of the first PDCCH for RAR and a bandwidth of the second PDCCH for the contention resolution message is less than or equal to a reception channel bandwidth of the terminal, and
wherein the reception channel bandwidth of the terminal is less than a carrier bandwidth of a serving cell of the base station.

10. The method of claim 9 , further comprising:
transmitting, to the terminal, a system information block (SIB),
wherein the SIB incudes first information on a first bandwidth part for the first PDCCH, second information on a second bandwidth part for the PUSCH.

11. The method of claim 10 ,
wherein the SIB further includes third information on a frequency resource for the second PDCCH and fourth information on a time resource for the first PDCCH for the RAR,
wherein the first PDCCH is transmitted based on the time resource and the first bandwidth part, and
wherein the second PDCCH is transmitted based on the frequency resource indicated by the third information.

12. The method of claim 10 ,
wherein the carrier bandwidth of the serving cell of the base station is divided into a plurality of bandwidth parts, and
wherein the SIB indicates the first bandwidth part and the second bandwidth part among the plurality of bandwidth parts, respectively.

13. The method of claim 12 ,
wherein a bandwidth of a physical random access channel (PRACH), to which the random access preamble is received, is less than a transmission channel bandwidth of the terminal, and
wherein the transmission channel bandwidth of the terminal is less than the carrier bandwidth of the serving cell of the base station.

14. The method of claim 9 , further comprising:
transmitting, to the terminal, a master information block (MIB) on a broadcast channel (BCH), the MIB including information indicating an offset from a frequency resource for the first PDCCH to a frequency resource in which the BCH is received,
wherein the first PDCCH is transmitted on the frequency resource identified based on the offset.

15. A terminal in a wireless communication system, the terminal comprising:
a transceiver configured to transmit or receive a signal; and
at least one processor coupled with the transceiver and configured to:
transmit, to a base station, a random access preamble,
receive, from the base station, a first physical downlink control channel (PDCCH) associated with a random access response (RAR),
receive, from the base station, the RAR on a physical downlink shared channel (PDSCH) based on the first PDCCH,
transmit, to the base station, a physical uplink shared channel (PUSCH) scheduled by an uplink grant of the RAR, and
receive, from the base station, second PDCCH associated with a contention resolution message,

wherein a bandwidth of the first PDCCH for RAR and a bandwidth of the second PDCCH for the contention resolution message is less than or equal to a reception channel bandwidth of the terminal, and
wherein the reception channel bandwidth of the terminal is less than a carrier bandwidth of a serving cell of the base station.

16. The terminal of claim 15 ,
wherein the at least one processor is further configured to receive, from the base station, a system information block (SIB), and
wherein the SIB incudes first information on a first bandwidth part for the first PDCCH, second information on a second bandwidth part for the PUSCH.

17. The terminal of claim 16 ,
wherein a bandwidth of a physical random access channel (PRACH), to which the random access preamble is transmitted, is less than a transmission channel bandwidth of the terminal, and
wherein the transmission channel bandwidth of the terminal is less than the carrier bandwidth o

Assignees

• Samsung Electronics Co Ltd

Inventors

• Agiwal Anil
• Chang Youngbin

Classifications

• H04W74/0838

  using contention-free random access [CFRA] · CPC title

• H04W74/0833

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

• H04W72/02

  Selection of wireless resources by user or terminal · CPC title

• H04W74/006 Primary

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

• H04W28/20 Primary

  Negotiating bandwidth · CPC title