5G Random Access Resource Indication Overhead Reduction
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Solution Overview
Problem
In the 5G NR wireless communication system, indicating resources for contention-free random access increases signaling overhead due to the need to specify positions in the time and frequency domains and preamble indexes for RACH resources.
Innovation Solution
A user apparatus is provided with a reception unit to receive blocks and indications of resources for contention-free random access, a control unit to identify these resources, and a transmission unit to transmit preambles using the identified resources, reducing signaling overhead by sharing or separating resource domains between contention-based and contention-free random access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all information items for specifying RACH resources (positions in time domain and frequency domain, preamble index, associated CSI-RS, associated SS blocks) are indicated to the user apparatus, then the user apparatus can perform contention-free random access, but signaling overhead is increased
Solution Approach 1:
The patent extracts only the necessary subset of RACH resource information from the complete set of parameters. Instead of indicating all information items (time domain positions, frequency domain positions, preamble indexes, CSI-RS associations, SS block associations), the invention selectively transmits only the essential elements required for contention-free random access, thereby reducing signaling overhead while maintaining functional capability
Solution Approach 2:
The patent makes RACH resource information serve multiple functions. The indicated RACH resource information is used both for contention-free random access and can be derived or adapted for contention-based random access scenarios. This multi-functionality allows the system to reduce dedicated signaling for contention-free access while maintaining flexibility for other access types
Data Source
AI summary
A user apparatus communicates with a base station apparatus. The user apparatus includes a reception unit configured to receive, from the base station apparatus, a plurality of blocks and an indication including information specifying a part of resources used for contention-free random access, a control unit configured to identify resources used for contention-free random access based on information specifying resources that are associated with the blocks and are used for random access, and based on the information specifying a part of resources used for contention-free random access, and a transmission unit configured to transmit a preamble to the base station apparatus using the identified resources used for contention-free random access.