Spatial Filtering for Random Access Channel Reliability
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring reliable and efficient random access channel (RACH) procedures, particularly in millimeter wave (mmW) networks, due to issues such as interference, channel fading, and high failure rates of preamble messages, which can lead to coverage limitations and increased signaling overhead.
Innovation Solution
Implementing spatial domain filtering for multiple preamble message transmissions during RACH procedures, allowing for PRACH repetition and diverse spatial domain filtering to enhance coverage and reduce transmission failures by increasing the likelihood of successful message reception at the network node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spatial domain filtering is applied to multiple preamble message transmissions, then RACH procedure reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the single RACH preamble transmission into multiple transmissions with different spatial domain filters. Each preamble message is transmitted using a distinct spatial filter from a configured set, dividing the transmission task into multiple independent attempts that collectively improve reliability without requiring complex adaptive filtering algorithms.
Solution Approach 2:
The system dynamically selects different spatial domain filters for each preamble transmission based on the configured set of filters. This dynamic switching between predefined filters allows the system to adapt to varying channel conditions while maintaining manageable complexity through pre-configuration rather than real-time optimization.
2Area of stationary object
If multiple preamble messages are transmitted with diverse spatial domain filtering, then coverage is enhanced, but signaling overhead increases
Solution Approach 1:
The network node pre-configures the set of spatial domain filters to be used for RACH preamble transmissions. By establishing the filter set in advance through RACH configuration messages, the system enables coverage enhancement through multiple filtered transmissions without requiring extensive real-time signaling to negotiate filter selections during the access procedure.
Solution Approach 2:
The patent changes the spatial domain filter parameter across multiple preamble transmissions. By varying the spatial filter parameter according to the pre-configured set, the system expands coverage area through diverse spatial paths while keeping signaling overhead minimal, as the filter selection follows predetermined patterns rather than requiring explicit confirmation exchanges.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a user equipment (UE) or a component thereof. The apparatus may be configured to receive a random access channel (RACH) configuration for a RACH procedure with a network node. The apparatus may be further configured to determine a set of spatial domain filters for the RACH procedure based on the RACH configuration, and each respective spatial domain filter of the set of spatial domain filters corresponds to a respective reference signal of a set of reference signals. The apparatus may be further configured to perform the RACH procedure, and to perform the RACH procedure, the apparatus may be configured to transmit, to the network node, a plurality of preamble messages using the set of spatial domain filters based on the RACH configuration.