Random access procedure timing designs

Patent metadata

Field	Value
Publication number	US-10327265-B2
Application number	US-201715648313-A
Country	US
Kind code	B2
Filing date	Jul 12, 2017
Priority date	Nov 4, 2016
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

A configurable new radio (NR) RACH procedure that may be executed by a UE and a base station is disclosed. A first message can be transmitted, in an inactive or idle state, a on a physical random access channel, where the first message includes a random access preamble. A second message can be received on a downlink channel in response to the first message, where the second message includes a temporary cell radio network temporary identifier and an uplink grant for the user equipment. A request can be transmitted on an uplink channel based on the uplink grant. A common search space of a downlink control channel can be monitored, such as for an acknowledgement message or a negative acknowledgement message corresponding to the request and identifiable based on the temporary cell radio network temporary identifier.

First claim

What is claimed is:

1. A method of wireless communications, comprising:
receiving, by a user equipment, a configuration indicating one or more parameters related to determining a random access procedure timeline, wherein the one or more parameters include user equipment capability information for selecting one or more configurable timing variables corresponding to a delay between different messages of a random access procedure timeline;
transmitting, by the user equipment in an inactive or idle state, a first message on a physical random access channel, wherein the first message includes a random access preamble;
receiving, by the user equipment, a second message on a downlink channel in response to the first message, wherein the second message includes a temporary cell radio network temporary identifier and an uplink grant for the user equipment, wherein at least one of the transmitting the first message or receiving the second message is based at least in part on the one or more configurable timing variables;
transmitting, by the user equipment and based on the random access procedure timeline, a request on an uplink channel based on the uplink grant; and
monitoring, by the user equipment, a common search space of a downlink control channel for an acknowledgement message or a negative acknowledgement message corresponding to the request and identifiable based on the temporary cell radio network temporary identifier.

2. The method of claim 1 , further comprising:
retransmitting, by the user equipment, the request in response to detecting the negative acknowledgement message corresponding to the request.

3. The method of claim 1 , wherein receiving the one or more parameters includes receiving, by the user equipment, base station capability information regarding a random access procedure, wherein at least one of the transmitting the first message or receiving the second message are also based on the random access procedure timeline determined based at least in part on the base station capability information.

4. The method of claim 3 , wherein receiving the one or more parameters includes receiving, by the user equipment and from a serving base station, the base station capability information for a target base station.

5. The method of claim 3 , wherein the one or more parameters include one or more of a carrier frequency of a base station, a cell size or class of the base station, or a processing capability of the base station or a corresponding network.

6. The method of claim 1 , further comprising transmitting, by the user equipment, the user equipment capability information.

7. The method of claim 1 , wherein the one or more parameters include one or more of an ability of the user equipment to support a self-contained slot, a latency requirement of the user equipment, a processing capability of the user equipment, or a carrier frequency configured for the user equipment.

8. The method of claim 1 , wherein transmitting the first message is based on a reference random access procedure timeline associated with a reference numerology of a base station with which the user equipment is connected, and wherein the reference random access procedure timeline is different than the random access procedure timeline.

9. The method of claim 1 , further comprising communicating with a serving base station based on a current random access procedure timeline, wherein the random access procedure timeline is associated with the user equipment being in a handover to a target base station, and the at least one of the transmitting the first message, receiving the second message, or transmitting the request is performed based on the random access procedure timeline, and wherein the current random access procedure timeline is different than the random access procedure timeline.

10. The method of claim 1 , wherein the second message also includes a request flexible transmission indicator, and further comprising determining a conflict in a first resource for sending the request, wherein transmitting the request on the uplink channel is based on the uplink grant and using a second resource based on the request flexible transmission indicator.

11. The method of claim 10 , wherein the request flexible transmission indicator indicates a delay value for delaying the transmitting of the request.

12. An apparatus, comprising:
a transceiver for communicating one or more wireless signals via one or more antennas;
a memory configured to store instructions; and
one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to:
receive a configuration indicating one or more parameters related to determining a random access procedure timeline, wherein the one or more parameters include user equipment capability information for selecting one or more configurable timing variables corresponding to a delay between different messages of a random access procedure timeline;
transmit, in an inactive or idle state, a first message on a physical random access channel, wherein the first message includes a random access preamble;
receive a second message on a downlink channel in response to the first message, wherein the second message includes a temporary cell radio network temporary identifier and an uplink grant for the apparatus, wherein the one or more processors are configured to at least one of the transmit the first message or receive the second message based at least in part on the one or more configurable timing variables;
transmit, based on the random access procedure timeline, a request on an uplink channel based on the uplink grant; and
monitor a common search space of a downlink control channel for an acknowledgement message or a negative acknowledgement message corresponding to the request and identifiable based on the temporary cell radio network temporary identifier.

13. The apparatus of claim 12 , wherein the one or more processors are further configured to retransmit the request in response to detecting the negative acknowledgement message corresponding to the request.

14. The apparatus of claim 12 , wherein the one or more processors are configured to receive the one or more parameters as base station capability information regarding a random access procedure, wherein the one or more processors are also configured to at least one of transmit the first message, or receive the second message based on the random access procedure timeline determined based at least in part on the base station capability information.

15. The apparatus of claim 14 , wherein the one or more processors are configured to receive the one or more parameters, from a serving base station, as the base station capability information for a target base station.

16. The apparatus of claim 14 , wherein the one or more parameters include one or more of a carrier frequency of a base station, a cell size or class of the base station, or a processing capability of the base station or a corresponding network.

17. The apparatus of claim 12 , wherein the one or more processors are further configured to transmit the user equipment capability information.

18. The apparatus of claim 12 , wherein the one or more parameters include one or more of an ability of the apparatus to support a self-contained slot, a latency requirement of the apparatus, a processing capability of the apparatus, or a carrier frequency configured for the apparatus.

19. The apparatus of claim 12 , wherein the one or more processors are configured to transmit the firs

Assignees

• Qualcomm Inc

Inventors

• Ly Hung
• Xu Hao
• Chen Wanshi
• Ji Tingfang
• Wang Renqiu
• Gaal Peter
• Aminzadeh Gohari Amir

Classifications

• H04L5/0055 Primary

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/0044

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title

• H04L5/001

  the frequencies being arranged in component carriers · CPC title

• H04W24/02

  Arrangements for optimising operational condition · CPC title