Two-Step RACH Reference Signal Configuration Across Multiple Slots
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in the two-step random access channel (RACH) procedure, particularly in determining configuration information for random access messages, which affects the overall efficiency and reliability of establishing connections between user equipment (UE) and base stations.
Innovation Solution
The implementation of a two-step RACH procedure that spans multiple transmission slots, where reference signal resources are identified based on uplink shared channel transmission occasions, allowing UEs to select appropriate random access and uplink shared channel transmission occasions and determine reference signal sequences for transmitting reference signals with the first random access message, enhancing resource utilization and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference signal resources are configured in each transmission slot of a multi-slot uplink shared channel transmission occasion, then reliability of random access message transmission is improved, but device complexity increases
Solution Approach 1:
The uplink shared channel transmission occasion is divided into multiple transmission slots, with reference signal resources configured in each slot. This segmentation allows the transmission to be broken down into manageable time units, improving reliability through multiple opportunities while maintaining organized resource management.
Solution Approach 2:
Reference signal resources are pre-configured and identified before the actual random access message transmission. The UE determines the reference signal resources based on the selected uplink shared channel transmission occasion, preparing the necessary signaling resources in advance to ensure reliable transmission.
2Use of energy by moving object
If multiple uplink shared channel transmission occasions are provided, then UE power saving is improved, but loss of time increases
Solution Approach 1:
The system provides multiple uplink shared channel transmission occasions with dynamic selection capability. The UE can select from multiple available occasions based on channel conditions and power considerations, allowing flexible adaptation between power saving and time efficiency.
Solution Approach 2:
The system changes the time domain parameter by providing multiple transmission occasions at different time points. This allows the UE to adjust its transmission timing, potentially skipping earlier occasions to save power or selecting earlier occasions to reduce latency based on immediate needs.
3Reliability
If reference signal resources span multiple transmission slots, then reliability is improved, but use of energy increases
Solution Approach 1:
The reference signal resources are segmented across multiple transmission slots rather than concentrated in a single slot. This distribution allows the transmission energy to be spread out, providing reliability through multiple opportunities while potentially reducing peak power requirements.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described for a two-step random access channel (RACH) procedure in which uplink random access preamble and message transmission occasions may span multiple transmission slots. Reference signal resources for transmitting a reference signal with a first random access message of the two-step RACH procedure may include at least one symbol in each of the multiple transmission slots. The reference signal resources, reference signal sequence, or both, may be identified based on a particular uplink random access message transmission occasion, random access preamble transmission occasion, random access preamble sequence configuration, or any combinations thereof.