Overlapping RACH Resources for Implicit Repetition Requests
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently managing random access channel (RACH) resources for reduced capability devices, leading to increased signaling overhead and reduced communication efficiency due to the need for explicit repetition requests and number indications.
Innovation Solution
The system employs overlapping RACH resources for both reduced capability reports and PUSCH repetition requests, allowing implicit indication of additional repetition requests or number indications, thereby reducing signaling overhead and enhancing communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit repetition requests and number indications are used for reduced capability devices, then communication reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent combines the capability report and repetition request into a single uplink message transmission. The reduced capability device sends both its capability information and repetition request simultaneously in one uplink message, eliminating the need for separate signaling and reducing overall signaling overhead while maintaining communication reliability
Solution Approach 2:
The uplink message is designed to serve multiple functions: it simultaneously reports device capability information and conveys repetition requests. This multi-functional approach allows the same signaling resources to carry multiple types of information, reducing the total signaling overhead required for reduced capability devices
2Ease of operation
If separate RACH resources are allocated for capability reports and repetition requests, then resource allocation clarity is improved, but device complexity increases
Solution Approach 1:
The patent merges the capability report and repetition request into a single uplink message that is transmitted through unified RACH resources. This consolidation simplifies the device's transmission process by eliminating the need to manage separate resources for different types of signaling, reducing device complexity while maintaining resource allocation clarity
3Loss of information
If multiple separate messages are transmitted for capability reporting and repetition requests, then information completeness is improved, but transmission time increases
Solution Approach 1:
The patent incorporates the repetition request directly into the capability report message that is transmitted in the initial uplink transmission. By including all necessary information (capability report and repetition request) in the first message rather than requiring follow-up transmissions, the system achieves complete information exchange while minimizing transmission time
Data Source
AI summary
Methods, apparatuses, and computer-readable medium for reducing signaling overhead for a RedCap UE are provided. An example method may include receiving, from a base station, a grant associated with a set of random access channel (RACH) resources, a first part of the set of RACH resources for a reduced capability report including a set of overlapping resources that overlaps with a second part of the set of RACH resources for a physical uplink shared channel (PUSCH) repetition request. The example method may further include transmitting, in the set of overlapping resources to the base station, one or more repetition requests or one or more repetition number indications.