2-Step RACH Msg-A PUSCH for Early Sensing and Positioning
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Solution Overview
Problem
The 2-step RACH procedure in 5G NR faces challenges with deteriorated detection performance of Msg-A PUSCH due to lack of initial timing estimation and adjustment, leading to potential communication inefficiencies and increased latency.
Innovation Solution
Incorporating sensing and positioning information into the Msg-A physical uplink shared channel (PUSCH) of the 2-step RACH procedure, enabling early sensing and positioning capabilities through UE and network device interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If 2-step RACH procedure is used to enable early initial PUSCH transmission with lower latency, then access latency is reduced, but detection performance of Msg-A PUSCH deteriorates due to lack of initial timing estimation and adjustment
Solution Approach 1:
The patent applies preliminary action by performing timing estimation and adjustment before the Msg-A PUSCH transmission. The network device estimates timing based on the PRACH preamble reception and generates a timing adjustment indication that is transmitted to the UE before the PUSCH is sent, allowing the UE to compensate for timing offsets in advance and ensuring accurate detection at the network side.
2Measurement precision
If sensing and positioning information is included in Msg-A PUSCH, then early sensing and positioning capability is enabled, but message complexity and processing requirements increase
Solution Approach 1:
The patent applies universality by designing the Msg-A PUSCH to serve multiple functions simultaneously: it carries both the traditional uplink data transmission and the sensing information (such as channel state information, reference signal received power, or positioning reference signal measurements). This multi-functional approach allows the network to obtain positioning and sensing data without requiring separate dedicated channels or messages.
Data Source
AI summary
Mechanisms for early uplink (UL) sensing and/or positioning are provided by including sensing and/or positioning information in Msg-A PUSCH of a 2-step RACH procedure. Other embodiments involve collaborative sensing by neighbor UEs over RACH occasions, exploiting sensing and/or positioning information that is included in Msg-A PUSCH of a 2-step RACH procedure.