Random-access response with analog beamforming

Patent metadata

Field	Value
Publication number	US-2024406963-A1
Application number	US-202418804564-A
Country	US
Kind code	A1
Filing date	Aug 14, 2024
Priority date	Jan 30, 2015
Publication date	Dec 5, 2024
Grant date	—

Abstract

A system and method of Random-Access Response, RAR, messaging when a base station employs narrow beamforming. Multiple RAR messages are successively transmitted from the base station to a User Equipment, UE, before any response to a RAR message is received from the UE. Thus, despite any calibration mismatch between Uplink, U L, and Downlink, DL, beams in the beamformed system, a RAR message is not only received by the UE, but is received over the most-suitable DL beam for that UE. Each RAR message may contain a message-specific scheduling-delay indicator in the UL grant carried in the RAR message to provide an adjustable time delay for the UE's uplink transmission scheduled by the UL grant. Multiple RAR transmissions can schedule a single UL transmission at a specific time instance or different UL transmissions at different time intervals. The UE may report to the base station the best DL RAR transmission detected by the UE.

First claim

What is claimed is:

1 . A method of transmitting a Random-Access Response (RAR) from a network entity to a User Equipment (UE) when the network entity employs narrow beamforming, wherein the method comprises performing the following by the network entity:
generating a plurality of RAR messages, wherein each RAR message carries a respective Uplink (UL) grant for the UE to enable the UE to respond to the RAR message; for each RAR message, providing a RAR message-specific time-delay indicator in the respective UL grant carried by the RAR message; configuring each RAR message-specific time-delay indicator to provide to the UE an indication of a time interval in which the UE is scheduled to transmit in the UL to respond to a respective RAR message; and successively transmitting the plurality of RAR messages to the UE before any response from the UE is received by the network entity in the UL.

Assignees

• Ericsson Telefon Ab L M

Inventors

• Furuskog Johan
• Sahlin Henrik
• Bergström Andreas
• Andersson Håkan
• Wiberg Niclas
• Zhang Qiang

Classifications

• H04W74/0833 Primary

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

• H04W74/08

  Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) · CPC title

• H04W72/1268

  of uplink data flows · CPC title

• H04W72/12

  Wireless traffic scheduling · CPC title

• H04W16/28 Primary

  using beam steering · CPC title