Transmission configuration and format for random access messages

Patent metadata

Field	Value
Publication number	US-10225867-B2
Application number	US-201615385058-A
Country	US
Kind code	B2
Filing date	Dec 20, 2016
Priority date	Sep 2, 2016
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

Wireless communications systems and methods related to performing random access procedures. A base station (BS) receives, from a user equipment (UE), a plurality of random access preambles from a plurality of beam directions, wherein each of the plurality of random access preambles is received from a different beam direction, and wherein the plurality of random access preambles are associated with multiple random access opportunities of a random access attempt. The BS sends, in response to the plurality of random access preambles, a plurality of random access response (RAR) messages in the plurality of beam directions.

First claim

What is claimed is:

1. A method of performing a random access procedure in a wireless communication network, the method comprising:
receiving, by a base station (BS) from a user equipment (UE), a plurality of random access preambles from a plurality of beam directions, wherein each of the plurality of random access preambles is received from a different beam direction, and wherein the plurality of random access preambles are associated with multiple random access opportunities of a random access attempt; and
sending, by the BS in response to the plurality of random access preambles, a plurality of random access response (RAR) messages in the plurality of beam directions by time-multiplexing a first RAR message of the plurality of RAR messages in a first beam direction of the plurality of beam directions with a second RAR message of the plurality of RAR messages in a second beam direction of the plurality of beam directions within a subframe, wherein the second beam direction is different from the first beam direction, and wherein each of the first RAR message and the second RAR message includes at least one orthogonal frequency division multiplexing (OFDM) symbol within the subframe,
wherein the sending the plurality of RAR messages includes:
sending, in the subframe, first control information and first data of the first RAR message in the first beam direction; and
sending, in the same subframe after sending the first control information and the first data, second control information and second data of the second RAR message in the second beam direction, or

wherein the sending the plurality of RAR messages includes:
sending, in the subframe, first control information of the first RAR message in the first beam direction;
sending, in the same subframe after sending the first control information, second control information of the second RAR message in the second beam direction;
sending, in the same subframe after sending the second control information, first data of the first RAR message in the first beam direction; and
sending, in the same subframe after sending the first data, second data of the second RAR message in the second beam direction.

2. The method of claim 1 , wherein the sending the plurality of RAR messages includes:
sending, in the subframe, the first control information and the first data of the first RAR message in the first beam direction; and
sending, in the same subframe after sending the first control information and the first data, the second control information and the second data of the second RAR message in the second beam direction.

3. The method of claim 1 , wherein the sending the plurality of RAR messages includes:
sending, in the subframe, the first control information of the first RAR message in the first beam direction;
sending, in the same subframe after sending the first control information, the second control information of the second RAR message in the second beam direction;
sending, in the same subframe after sending the second control information, the first data of the first RAR message in the first beam direction; and
sending, in the same subframe after sending the first data, the second data of the second RAR message in the second beam direction.

4. The method of claim 1 , further comprising sending, by the BS, a rule for transmissions of multiple rando access preambles using multiple random access opportunities in different beam directions per random access attempt.

5. The method of claim 1 , further comprising sending, by the BS, one or more downlink beams carrying a transmission configuration in at least the plurality of beam directions, wherein the transmission configuration indicates information associated with a random access message transmission time interval spanning less than a system nominal subframe.

6. The method of claim 5 , wherein the transmission configuration further indicates a reference numerology that defines the system nominal subframe, and wherein the reference numerology includes a tone spacing and at least one of a number of symbols or a symbol duration.

7. A method of performing a random access procedure in a wireless communication network, the method comprising:
sending, by a user equipment (UE) to a base station (BS), a plurality of random access preambles in a plurality of beam directions, wherein each of the plurality of random access preambles is transmitted in a different beam direction, and wherein the plurality of random access preambles are associated with multiple random access opportunities of a random access attempt; and
receiving, by the UE from the BS in response to at least a first random access preamble of the plurality of random access preambles, a first random access response (RAR) message in a first beam direction of the plurality of beam directions, wherein the first RAR message in the first beam direction is time-multiplexed with a second RAR message in a second beam direction of the plurality of beam directions within a subframe, wherein the second beam direction is different from the first beam direction, and wherein each of the first RAR message and the second RAR message includes at least one orthogonal frequency division multiplexing (OFDM) symbol within the subframe,
wherein the receiving the one or more RAR messages comprises:
receiving, in the subframe, first control information and first data of the first RAR message in the first beam direction; and
receiving, in the same subframe after receiving the first control information and the first data, second control information and second data of the second RAR message in the second beam direction, or

wherein the receiving the one or more RAR messages comprises:
receiving, in the subframe, first control information of the first RAR message in the first beam direction;
receiving, in the same subframe after receiving the first control information, second control information of the second RAR message in the second beam direction;
receiving, in the same subframe after receiving the second control information, first data of the first RAR message in the first beam direction; and
receiving, in the same subframe after receiving the first data, second data of the second RAR message in the second beam direction.

8. The method of claim 7 , wherein each RAR message spans at least a mini-slot including at least one OFDM symbol.

9. The method of claim 7 , wherein the receiving the one or more RAR messages comprises:
receiving, in the subframe, the first control information and the first data of the first RAR message in the first beam direction; and
receiving, in the same subframe after receiving the first control information and the first data, the second control information and the second data of the second RAR message in the second beam direction.

10. The method of claim 7 , wherein the receiving the one or more RAR messages includes:
receiving, in the subframe, the first control information of the first RAR message in the first beam direction;
receiving, in the same subframe after receiving the first control information, the second control information of the second RAR message in the second beam direction;
receiving, in the same subframe after receiving the second control information, the first data of the first RAR message in the first beam direction; and
receiving, in the same subframe after receiving the first data, the second data of the second RAR message in the second beam direction.

11. The method of claim 7 , further comprising:
receiving, by the UE from the BS, a rule for transmitting multiple random access preambles using multiple random access opportunities in different beam directions per random access attempt prior to R

Assignees

• Qualcomm Inc

Inventors

• Nagaraja Sumeeth
• Luo Tao
• Akkarakaran Sony
• John Wilson Makesh Pravin
• Ahmad Aitzaz
• Chakraborty Kaushik

Classifications

• H04W72/0446 Primary

  Resources in time domain, e.g. slots or frames · CPC title

• H04W16/28 Primary

  using beam steering · CPC title

• H04B7/00

  Radio transmission systems, i.e. using radiation field (H04B10/00, H04B15/00 take precedence) · CPC title

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W74/0833 Primary

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