PRACH and Msg3 Repetition Interaction in 5G NR
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently managing random access channel (RACH) procedures, especially in scenarios requiring PRACH and PUSCH repetitions, which can lead to inefficiencies and potential collisions.
Innovation Solution
The proposed solution involves a method where a user equipment (UE) receives an indication of PRACH resources from a base station and transmits PRACH repetitions using these resources. The base station then grants a PUSCH repetition based on the received PRACH repetitions, allowing for implicit indication of PUSCH repetitions through PRACH repetitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRACH repetitions are transmitted using dedicated resources, then coverage is improved, but resource collision and inefficiency occur
Solution Approach 1:
The patent combines PRACH repetition transmission with uplink data transmission by allowing the UE to transmit both random access preambles and uplink data simultaneously on the same physical resources. This merging eliminates dedicated PRACH repetition resources, prevents resource collision, and improves overall resource efficiency while maintaining coverage enhancement through repeated transmissions.
2Device complexity
If separate resources are allocated for PRACH and PUSCH, then resource management is simplified, but system complexity increases
Solution Approach 1:
The patent makes uplink resources universal by allowing them to serve multiple purposes: both random access preamble transmission and uplink data transmission. The base station can dynamically indicate whether allocated uplink resources should be used for PRACH repetitions, Msg3 transmission, or regular uplink data, providing system flexibility without requiring separate dedicated resources for each function.
Data Source
AI summary
Methods, apparatuses, and computer readable medium for PRACH repetition and Msg 3 repetition are provided. An example method may include receiving, from a base station, an indication associated with a set of PRACH resources. The example method may further include transmitting, to the base station, one or more PRACH repetitions using the set of PRACH resources. The example method may further include receiving, from the base station based on the one or more PRACH repetitions, a grant associated with a PUSCH repetition.