Waveform-dependent random access channel procedure

Patent metadata

Field	Value
Publication number	US-11140715-B2
Application number	US-201715793223-A
Country	US
Kind code	B2
Filing date	Oct 25, 2017
Priority date	Oct 26, 2016
Publication date	Oct 5, 2021
Grant date	Oct 5, 2021

Abstract

Techniques are described for wireless communication. A method for wireless communication at a user equipment (UE) includes receiving an indication of at least one receive capability of a network access device; transmitting a first message of a random access channel (RACH) procedure; receiving a random access response (RAR) message in response to transmitting the first message; and interpreting the RAR message according to a format based at least in part on the received indication. A method for wireless communication at a network access device includes transmitting an indication of at least one receive capability of the network access device; receiving, from a UE, a first message of a RACH procedure; and transmitting a RAR message to the UE in response to receiving the first message. The RAR message has a format based at least in part on the at least one receive capability of the network access device.

First claim

What is claimed is:

1. A method for wireless communication at a user equipment (UE), comprising:
receiving an indication of at least one receive capability of a network access device;
transmitting a first message of a random access channel (RACH) procedure;
receiving a random access response (RAR) message in response to transmitting the first message;
interpreting the RAR message according to a format based at least in part on the received indication;
identifying, based at least in part on the indication, both a CP-OFDM waveform receive capability and a discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform receive capability of the network access device;
determining a type of uplink resource assignment included in the RAR message based at least in part on a second indication included in the RAR message; and
interpreting an uplink resource assignment included in the RAR message as the determined type of uplink resource assignment.

2. The method of claim 1 , further comprising:
identifying, based at least in part on the indication, only a cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) waveform receive capability of the network access device; and
interpreting an uplink resource assignment included in the RAR message as a CP-OFDM waveform resource assignment.

3. The method of claim 2 , further comprising:
transmitting, based at least in part on the uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH), or a combination thereof.

4. The method of claim 1 , wherein the determined type of uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

5. The method of claim 1 , further comprising:
transmitting, based at least in part on the uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a PUSCH, or a PUCCH, or a combination thereof.

6. The method of claim 1 , wherein the indication of the at least one receive capability of the network access device is received in system information.

7. The method of claim 6 , wherein the system information is received in at least one of: a minimum system information (MSI) received on a physical broadcast channel (PBCH), or a remaining minimum system information (RMSI) received on a physical downlink shared channel (PDSCH), or a combination thereof.

8. The method of claim 1 , wherein the first message is transmitted according to a predetermined uplink resource assignment.

9. The method of claim 8 , wherein the predetermined uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

10. An apparatus for wireless communication at a user equipment (UE), comprising:
means for receiving an indication of at least one receive capability of a network access device;
means for transmitting a first message of a random access channel (RACH) procedure;
means for receiving a random access response (RAR) message in response to transmitting the first message;
means for interpreting the RAR message according to a format based at least in part on the received indication;
means for identifying, based at least in part on the indication, both a CP-OFDM waveform receive capability and a discrete Fourier transform spread orthogonal frequency- division multiplexing (DFT-s-OFDM) waveform receive capability of the network access device;
means for determining a type of uplink resource assignment included in the RAR message based at least in part on a second indication included in the RAR message; and
means for interpreting an uplink resource assignment included in the RAR message as the determined type of uplink resource assignment.

11. The apparatus of claim 10 , further comprising:
means for identifying, based at least in part on the indication, only a cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) waveform receive capability of the network access device; and
means for interpreting an uplink resource assignment included in the RAR message as a CP-OFDM waveform resource assignment.

12. The apparatus of claim 11 , further comprising:
means for transmitting, based at least in part on the uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH), or a combination thereof.

13. The apparatus of claim 10 , wherein the determined type of uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

14. The apparatus of claim 10 , further comprising:
means for transmitting, based at least in part on the uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a PUSCH, or a PUCCH, or a combination thereof.

15. The apparatus of claim 10 , wherein the indication of the at least one receive capability of the network access device is received in system information.

16. The apparatus of claim 15 , wherein the system information is received in at least one of: a minimum system information (MSI) received on a physical broadcast channel (PBCH), or a remaining minimum system information (RMSI) received on a physical downlink shared channel (PDSCH), or a combination thereof.

17. The apparatus of claim 10 , wherein the first message is transmitted according to a predetermined uplink resource assignment.

18. The apparatus of claim 17 , wherein the predetermined uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

19. An apparatus for wireless communication at a user equipment (UE), comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory, the instructions being executable by the processor to:
receive an indication of at least one receive capability of a network access device;
transmit a first message of a random access channel (RACH) procedure;
receive a random access response (RAR) message in response to transmitting the first message;
interpret the RAR message according to a format based at least in part on the received indication;
wherein the instructions are executable by the processor to:
identify, based at least in part on the indication, both a CP-OFDM waveform receive capability and a discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform receive capability of the network access device;
determine a type of uplink resource assignment included in the RAR message based at least in part on a second indication included in the RAR message; and
interpret an uplink resource assignment included in the RAR message as the determined type of uplink resource assignment.

20. The apparatus of claim 19 , wherein the instructions are executable by the processor to:
identify, based at least in part on the indication, only a cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) waveform receive capability of the network access device; and
interpret an uplink resource assignment included in the RAR message as a CP- OFDM waveform resource assignment.

21. The apparatus of claim 20 , wherein the instructions are executable by th

Assignees

• Qualcomm Inc

Inventors

• Ly Hung
• Xu Hao
• Chen Wanshi

Classifications

• H04W74/0833 Primary

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

• H04W74/0836

  with 2-step access · CPC title

• H04W74/0838

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

• H04W74/002

  Transmission of channel access control information · CPC title

• H04L1/0023

  characterised by the signalling · CPC title