Terminal PUSCH Resource Positioning for Two-Step Random Access
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Solution Overview
Problem
In the two-step random access procedure of NR, user terminals face challenges in determining the proper PUSCH resources for MsgA transmission due to unclear specifications.
Innovation Solution
A technique is provided where the user terminal determines the position of the PUSCH resource based on its relative position with respect to the preamble resource, using RRC messages or absolute positions specified by the base station, allowing for accurate resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a two-step random access procedure is implemented to reduce latency and power consumption, then the delay and power usage are reduced, but the specification clarity for PUSCH resource determination is insufficient
Solution Approach 1:
The terminal determines the PUSCH resource position autonomously by calculating the offset from the preamble resource position according to the received offset indicator, without requiring additional base station signaling or coordination. This self-determination mechanism maintains the fast access benefits while ensuring clear resource allocation through standardized offset calculation rules.
2Adaptability or versatility
If PUSCH resource position is determined by offset from preamble resource, then resource allocation flexibility is improved, but resource determination complexity increases
Solution Approach 1:
The base station configures an offset indicator parameter that the terminal uses to calculate the PUSCH resource position relative to the preamble resource. By changing the offset parameter value, the system can flexibly allocate PUSCH resources in different time-frequency positions while the terminal only needs to perform simple offset addition based on the received parameter, maintaining low computational complexity.
Data Source
AI summary
A terminal including: a control unit configured to determine a position of a PUSCH resource to be used in a first step in a two step random access procedure based on a relative position with respect to a position of a preamble resource; and a transmission unit configured to transmit a message of the first step using the preamble resource and the PUSCH resource.