US Patent No. 10,772,135

TWO-STEP CONTENTION-BASED RANDOM ACCESS OVER RADIO RESOURCES IN LAA


Patent No. 10,772,135
Issue Date September 08, 2020
Title Two-step Contention-based Random Access Over Radio Resources In Laa
Inventorship Amitav Mukherjee, Fremont, CA (US)
Assignee TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)

Claim of US Patent No. 10,772,135

1. A contending radio node configured for attempting contention-based random access over one or more radio resources, the contending radio node comprising:processing circuitry and a memory, the memory containing instructions executable by the processing circuitry whereby the contending radio node is configured to:
obtain a timing advance sequence based on which a timing advance for transmission from the contending radio node to a recipient radio node is derivable, wherein the timing advance sequence is susceptible to contention;
obtain a contention-resolving identity of the contending radio node;
transmit, via radio circuitry, using the same transmission advancement timing, the timing advance sequence and the contention-resolving identity to the recipient radio node on the one or more radio resources;
responsive to said transmitting, receive from the recipient radio node a response signal that indicates a contention-resolving identity as well as a timing advance derived from a timing advance sequence received by the recipient radio node;
resolve the contention in favor of the contending radio node when the contention-resolving identity indicated by the response signal corresponds to the contention-resolving identity that the contending radio node transmitted; and
responsive to resolving the contention in favor of the contending radio node, adjust the transmission advancement timing that governs the timing advancement of transmissions from the contending radio node to the recipient radio node, according to the timing advance indicated by the response signal.