Random Access Channel Resource Segmentation for Latency and Interference
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Solution Overview
Problem
Existing random-access procedures in wireless networks face significant latency and reduced reliability due to increased interference, particularly in shortened procedures like the 2-step RACH procedure.
Innovation Solution
The implementation of a RACH procedure where resources for transmitting a preamble and data are offset by a time gap, allowing for the determination of optimal beam configurations and reducing the need for additional grants, thereby minimizing latency and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a shortened RACH procedure (e.g., 2-step) is implemented, then latency is reduced, but reliability deteriorates due to increased interference
Solution Approach 1:
The patent segments the RACH procedure into distinct resource sets: first resources for preamble transmission and second resources for data transmission, separated by a time gap. This segmentation allows the UE to transmit both preamble and data in a single access attempt while providing the network time to process and reduce interference, thus maintaining low latency while improving reliability.
Solution Approach 2:
The patent applies preliminary action by having the UE transmit data in the second resources immediately after the preamble in the first resources, within the same RACH procedure. This preliminary transmission of data eliminates the need for additional scheduling grants and reduces overall latency, while the time gap between resource sets allows the network to prepare for reduced interference in subsequent transmissions.
2Loss of time
If resources for preamble and data are transmitted simultaneously, then latency is reduced, but interference increases and reliability decreases
Solution Approach 1:
The patent divides transmission resources into two separate sets with a time gap: first resources for preamble and second resources for data. This segmentation in time domain reduces simultaneous interference while maintaining low latency by eliminating the need for additional scheduling exchanges.
Solution Approach 2:
The time gap between first resources and second resources acts as an intermediary element. It provides the network with processing time to handle the preamble reception and prepare for the data transmission, reducing interference while maintaining efficient low-latency operation.
3Reliability
If additional grants and higher-layer connections are established, then reliability is improved, but latency increases
Solution Approach 1:
The patent implements preliminary action by including data transmission in the second resources as part of the initial RACH procedure. This eliminates the need for subsequent scheduling grants and higher-layer connection setup, thereby maintaining reliability while significantly reducing the latency that would otherwise be introduced by additional signaling exchanges.
Solution Approach 2:
The patent merges the data transmission function with the initial RACH procedure by allocating second resources for data within the same access attempt. This combining of functions eliminates the need for separate scheduling and connection setup procedures, reducing latency while maintaining reliability through proper resource management.
Data Source
AI summary
At least one information block is received from a base station of a network, the at least one information block indicating one or more first resources (511) and one or more second resources (512) for a random-access procedure, the second resources (512) being offset from the first resources (511) by a time gap (550). A preamble (2011) of the random-access procedure is transmitted to the base station using the one or more first resources (511) and data (2012) is transmitted to the base station using the one or more second resources (512).