Facilitating signaling and transmission protocols for enhanced beam management for initial access

Patent metadata

Field	Value
Publication number	US-10314082-B2
Application number	US-201815925822-A
Country	US
Kind code	B2
Filing date	Mar 20, 2018
Priority date	May 4, 2017
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

Enhanced beam management for a wireless communication system is provided. In one example, a method comprises: receiving, from a mobile device, a message indicating first beam information for a selected first beam of beams associated with the base station device, wherein the message is a first received message of a random access channel procedure; and receiving, from the mobile device, message indicating second beam information for a selected second beam of the beams associated with the base station device, wherein the selected second beam is an alternative to the selected first beam for transmission of downlink data to the mobile device from the base station device, and wherein the second beam is indicated in the first message of a two-step random access channel procedure. Methods of signaling the second beam and/or transmission diversity approaches employing the first beam and/or the second beam are described.

First claim

What is claimed is:

1. A method, comprising:
receiving, by a base station device comprising a processor from a mobile device, a message indicating first beam information for a selected first beam of beams associated with the base station device and indicating second beam information for a selected second beam of the beams, wherein the selected second beam is an alternative to the selected first beam for transmission of downlink data to the mobile device from the base station device, wherein the receiving the message comprises receiving the message as a first message of a multi-step random access channel procedure, wherein the first message comprises a random access preamble and a device identification message, and wherein the random access preamble is employed to facilitate a transfer of the mobile device from an idle state to a connected state; and
in response to the receiving the beam information, facilitating, by the base station device, transmitting, to the mobile device, a random access channel response as a second message of the two step random access channel procedure.

2. The method of claim 1 , wherein the multi-step random access channel procedure is a two-step random access channel procedure, wherein the method further comprises, prior to the receiving the message indicating the first beam information and the second beam information, facilitating, by the base station device, transmitting, to the mobile device, a signal comprising a command to the mobile device to transmit, to the base station device, information about an alternative beam that is an alternative to the selected first beam, and wherein the facilitating the transmitting of the signal comprises employing system information.

3. The method of claim 2 , wherein the facilitating the transmitting of the signal comprises facilitating the transmitting of a dedicated signal, to the mobile device, in lieu of a broadcast signal, and wherein the dedicated signal comprises the system information from the base station device.

4. The method of claim 2 , wherein the system information is included in a system information block comprising random access parameter information and transmitted using a downlink shared channel.

5. The method of claim 2 , wherein the system information indicates a format of the first message of the two step random access channel procedure and whether the mobile device is to report an identification of the alternative beam to the base station device.

6. The method of claim 1 , further comprising:
employing the selected second beam instead of the selected first beam; and
facilitating, by the base station device, transmitting, to the mobile device, the second message of the two step random access channel procedure and user data.

7. The method of claim 1 , further comprising:
facilitating, by the base station device, transmitting, to the mobile device, the second message of the two step random access channel procedure and user data, wherein the facilitating the transmitting of the second message and the user data comprises facilitating the transmitting of a same content of the user via the selected first beam and the selected second beam.

8. The method of claim 1 , further comprising:
combining, by the base station device, the selected first beam and the selected second beam into a third beam, wherein the third beam is wider than the selected first beam and the selected second beam; and
facilitating, by the base station device, transmitting, to the mobile device, the second message of the two step random access channel procedure and user data, via the third beam.

9. The method of claim 1 , wherein the first beam information is indicated by the random access preamble.

10. A base station device, comprising:
a processor; and
a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising:
receiving, from a mobile device, a first message indicating first beam information for a selected first beam of beams associated with the base station device, wherein the first message is a first message of a random access channel procedure that is received by the base station device, and wherein the random access channel procedure is employed to facilitate a transfer of the mobile device from an idle state to a connected state; and
receiving, from the mobile device, a second message indicating second beam information for a selected second beam of the beams associated with the base station device, wherein the selected second beam is an alternative to the selected first beam for transmission of downlink data to the mobile device from the base station device, and wherein the second message is a second message of the random access channel procedure that is transmitted by the base station device.

11. The base station device of claim 10 , wherein the operations further comprise, prior to the receiving the second message indicating the second beam information, signaling to the mobile device comprising signaling a command to the mobile device to transmit information to the base station device about an alternative beam, wherein the signaling employs system information, and wherein the system information is employed to convey system information blocks comprising random access parameters to the mobile device.

12. The base station device of claim 11 , wherein the signaling comprises signaling system information of a system information block or a master information block indicating a format of the second message indicating the second beam and further indicating whether the mobile device is to generate a report identifying the alternative beam.

13. The base station device of claim 10 , wherein the operations further comprise:
transmitting data to the mobile device, and wherein the transmitting the data comprises transmitting the data employing the selected second beam instead of the selected first beam.

14. The base station device of claim 10 , wherein the operations further comprise:
transmitting data to the mobile device, and wherein the transmitting the data comprises transmitting the data employing the selected first beam and the selected second beam with a result that a same content of the data is transmitted on the selected first beam and the selected second beam.

15. The base station device of claim 10 , wherein the operations further comprise:
combining the selected first beam and the selected second beam into a third beam, wherein the third beam is wider than the selected first beam and the selected second beam; and
transmitting data to the mobile device, wherein the transmitting comprises transmitting the data employing the third beam.

16. A non-transitory machine-readable storage medium, comprising executable instructions that, when executed by a processor of a mobile device, facilitate performance of operations, comprising:
facilitating transmitting a first message indicating first beam information for a selected first beam of beams associated with a base station device, wherein the first message is part of a random access channel procedure, and wherein the random access channel procedure is employed to facilitate a handover of the mobile device;
facilitating transmitting a second message indicating second beam information for a selected second beam of the beams associated with the base station device, wherein the selected second beam is an alternative to the selected first beam for transmission of downlink data to the mobile device from the base station device, and wherein the second message is transmitted as part of the random access channel procedure; and
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Assignees

• At & T Ip I Lp

Inventors

• Akoum Salam
• Novlan Thomas
• Wang Xiaoyi
• Ghosh Arunabha
• Bendlin Ralf

Classifications

• H04B7/0408 Primary

  using two or more beams, i.e. beam diversity · CPC title

• H04W74/006

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

• H04B7/0695

  using beam selection · CPC title

• H04W74/0833 Primary

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

• H04B7/06952

  Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping · CPC title