Two-Step Random Access Resource Mapping for PUSCH Conflict Avoidance
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Solution Overview
Problem
In radio communication systems, conflicts arise between uplink and downlink configurations during two-step random access procedures, particularly due to flexible uplink and downlink configurations and important downlink signals like synchronization signal blocks, making it challenging to determine valid random access and data transmission resources.
Innovation Solution
A method for determining valid random access and PUSCH resources based on received configurations, involving mapping between random access and PUSCH resources, ensuring they do not overlap with other uplink-downlink resources, and using specific conditions to validate these resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flexible uplink and downlink configurations are used to accommodate important downlink signals like synchronization signal blocks, then downlink signal transmission is improved, but conflicts arise between uplink and downlink resources making it difficult to determine valid random access resources
Solution Approach 1:
The patent applies preliminary action by establishing clear validity determination rules for uplink and downlink resources before random access procedures occur. The base station pre-configures validity indication information that tells the terminal whether specific uplink resources are valid for random access, eliminating the need for complex real-time conflict detection and resolution during random access operations.
2Adaptability or versatility
If uplink resources are allocated for random access and data transmission, then communication functionality is improved, but conflicts with downlink resources reduce the number of valid random access resources
Solution Approach 1:
The patent extracts the conflict resolution mechanism from the resource allocation process itself. By separating the validity determination (performed by the base station based on overall system configuration) from the resource usage (performed by the terminal), the system can allocate resources for multiple purposes while the base station selectively designates which uplink resources remain valid for random access, effectively extracting conflicting resources from the random access pool.
3Reliability
If the terminal determines valid resources based on configuration information, then resource conflict avoidance is improved, but the determination process becomes complex due to multiple validation conditions
Solution Approach 1:
The patent introduces validity indication information as an intermediary element between the base station's resource configuration and the terminal's resource selection. This intermediary carries pre-determined validity information from the base station to the terminal, simplifying the terminal's determination process from evaluating multiple complex conditions to simply checking the validity indication provided by the network.
Data Source
AI summary
A method for random access (RA) performed by a terminal in a communication system, is provided. The method includes receiving, from a base station, a first random access channel (RACH) configuration for 4-step RA, a second RACH configuration for 2-step RA, and physical uplink shared channel (PUSCH) configuration, in case that a type of the RA is the 2-step RA, identifying an RA occasion for the 2-step RA; identifying a valid PUSCH resource based on the PUSCH configuration, wherein the valid PUSCH resource is a PUSCH resource not overlapping with the RA occasion for the 2-step RA, and in case that a random access preamble in the RA occasion for the 2-step RA is not mapped to the valid PUSCH resource, transmitting, to the base station, the random access preamble in the RA occasion for the 2-step RA.