5G NR Random Access Numerology for BWP Ambiguity Reduction
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Solution Overview
Problem
There is a need for improvements in 5G New Radio (NR) technology, particularly in random access procedures, to enhance efficiency and reliability, especially in heterogeneous networks and unlicensed frequency spectrums, where existing solutions do not adequately address issues such as UL BWP ambiguity and contention-free random access.
Innovation Solution
The proposed solution involves optimizing the random access procedure by employing a method for transmitting a random access message that includes selecting a random access resource based on down-link reference signals, such as SSBs or CSI-RS, and using beam-specific preamble sequences to improve synchronization and reduce ambiguity in bandwidth part operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam-specific preamble sequences are used for random access, then synchronization accuracy and beam alignment are improved, but device complexity and configuration requirements increase
Solution Approach 1:
The patent applies local quality by assigning different preamble sequences to different beams based on their specific characteristics and coverage areas. Each beam is configured with dedicated preamble sequences that are optimized for that particular beam's propagation properties, allowing UEs to select the most appropriate preamble for their location and improving overall synchronization accuracy without requiring uniform treatment of all beams.
2Adaptability or versatility
If multiple numerologies are supported for RMSI delivery, then adaptability to different network conditions is improved, but device complexity and configuration requirements increase
Solution Approach 1:
The patent implements universality by enabling the UE to support multiple numerologies for RMSI delivery simultaneously. The UE is configured with multiple numerology options and can automatically select the appropriate one based on network conditions, allowing the same UE hardware to efficiently handle diverse network scenarios without requiring separate dedicated hardware for each numerology type.
3Productivity
If dynamic BWP switching is implemented, then spectrum utilization and network flexibility are improved, but reliability andambiguity in BWP operation increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with multiple numerologies and BWP parameters before actual communication begins. The UE stores configuration information about different numerologies and their associated BWPs in advance, allowing for rapid and reliable switching without ambiguity during dynamic BWP transitions, thus maintaining reliability while enabling flexible spectrum utilization.
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AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives, in an active down-link bandwidth part, a random access response from a base station indicating an up-link resource in an active up-link bandwidth part for transmitting a random access message. The UE generates the random access message based on a numerology of the active up-link bandwidth part. The UE transmits the random access message at the up-link resource in the active up-link bandwidth part.