PRACH PUSCH TDM Multiplexing for 2-Step RACH
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently multiplexing and configuring physical random access channels (PRACH) and physical uplink shared channels (PUSCH) for the 2-step random access channel (RACH) procedure, particularly in determining the appropriate occasions and time offsets for these channels to support both 2-step and 4-step RACH procedures.
Innovation Solution
The method involves multiplexing PRACH and PUSCH occasions using time division multiplexing (TDM) schemes at both slot-level and symbol-level, with specific configurations for PRACH and PUSCH occasions, and configuring time offsets between them, allowing for sharing or separation of resources based on the RACH procedure type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PRACH and PUSCH occasions are multiplexed using TDM schemes, then resource allocation efficiency is improved, but device complexity increases due to multiple configuration schemes
Solution Approach 1:
The patent implements dynamic TDM multiplexing schemes where PRACH and PUSCH occasions can be flexibly configured at different time granularities (slot-level or symbol-level). The system can adaptively select between slot-level TDM (separating PRACH in one slot and PUSCH in another slot) and symbol-level TDM (separating PRACH and PUSCH within the same slot using different symbols), allowing the configuration to dynamically adjust based on traffic conditions and resource availability, thereby improving resource allocation efficiency while managing complexity through structured flexibility
Solution Approach 2:
The patent segments the time domain into different granularities (slots and symbols) to multiplex PRACH and PUSCH occasions. By dividing the time resource into slot-level segments or symbol-level segments, the system can independently configure PRACH and PUSCH in different segments, enabling efficient resource allocation without requiring complex spatial or frequency separation, thus improving productivity while maintaining manageable device complexity through temporal segmentation
2Productivity
If PRACH occasions are shared between 2-step and 4-step RACH procedures, then resource utilization is improved, but reliability deteriorates due to potential conflicts
Solution Approach 1:
The patent introduces a configuration parameter that acts as an intermediary to control PRACH occasion sharing between 2-step and 4-step RACH procedures. This parameter enables or disables the sharing function, allowing the system to mediate between resource utilization and reliability requirements. When sharing is enabled, resources are efficiently utilized; when disabled, reliability is prioritized by dedicating separate PRACH occasions, thus resolving the contradiction through configurable mediation
Solution Approach 2:
The patent changes the operational parameter of PRACH occasion allocation from fixed to configurable, allowing the system to adjust the sharing behavior between 2-step and 4-step RACH procedures based on network conditions. By parameterizing the sharing capability, the system can optimize resource utilization when conditions permit while ensuring reliability when needed, effectively managing the trade-off between productivity and reliability
3Device complexity
If slot-level TDM is used for multiplexing, then device complexity is reduced, but loss of time increases due to larger time offsets
Solution Approach 1:
The patent implements a dynamic selection mechanism between slot-level TDM and symbol-level TDM multiplexing schemes. The system can adaptively choose the appropriate granularity based on timing requirements and resource availability. When low latency is critical, symbol-level TDM is selected to minimize time offset; when simplicity is prioritized, slot-level TDM is used, thus dynamically balancing device complexity and time loss
4Loss of time
If symbol-level TDM is used for multiplexing, then latency is reduced, but device complexity increases due to finer time granularity
Solution Approach 1:
The patent enables dynamic selection between symbol-level TDM and slot-level TDM schemes, allowing the system to activate symbol-level TDM (with finer time granularity and lower latency) only when performance requirements demand it. Otherwise, the simpler slot-level TDM is used, thus dynamically adjusting device complexity to match performance needs and avoiding unnecessary complexity in normal operation
Data Source
AI summary
A method of user equipment in a wireless communication system includes transmitting a message A including a physical random access channel (PRACH) preamble and a physical uplink shared channel (PUSCH), wherein the PRACH occasions for transmitting the PRACH preamble and the PUSCH occasions for transmitting the PUSCH are time division multiplexed (TDM) on the basis of one method among one or more pre-set methods, the one or more pre-set methods including a first method related to slot level TDM.