RACH Preamble Sequence Selection for High-Mobility Wireless Access
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Solution Overview
Problem
Conventional wireless communication systems require additional signaling overhead for user equipment (UE) in restricted circular shift areas to acquire sequence type information for random access, which is inefficient and increases complexity.
Innovation Solution
A method for user equipment to select a random access channel (RACH) preamble sequence using parameter information, where the parameter information is analyzed differently for high-mobility and low-mobility modes, allowing the UE to generate the sequence without additional signaling overhead by reanalyzing sequence-set signaling information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional signaling overhead is used to provide sequence type information to UE in restricted circular shift areas, then the UE can acquire sequence type information accurately, but the signaling overhead and system complexity increase
Solution Approach 1:
The UE independently determines the sequence type (first type or second type) by analyzing the parameter information received from the base station according to predetermined rules. The base station does not need to explicitly signal the sequence type, as the UE self-determines it based on whether the parameter information value is less than a threshold. This eliminates the need for additional signaling overhead while ensuring accurate sequence type acquisition.
Solution Approach 2:
The patent uses the value of parameter information (specifically whether it is less than a threshold) to implicitly indicate the sequence type. By changing the interpretation of the parameter information based on its value, the system can convey sequence type information without adding explicit signaling. The UE interprets parameter values differently based on the high-mobility or low-mobility mode, effectively using parameter changes to encode sequence type information.
2Adaptability or versatility
If the system supports both high-mobility and low-mobility modes with different sequence types, then the system adapts to different mobility conditions, but the device complexity and configuration management increase
Solution Approach 1:
The system dynamically adapts the sequence type based on the mobility condition of the UE. The base station configures different parameter information values for high-mobility and low-mobility modes, and the UE determines the appropriate sequence type dynamically based on the received parameter value and its mobility state. This allows the system to adapt to different mobility conditions without requiring complex static configuration management.
Solution Approach 2:
The parameter information serves multiple functions: it both configures the random access parameters and implicitly indicates the sequence type. The same parameter information is used for both high-mobility and low-mobility modes, with the UE interpreting it differently based on the mobility condition. This multi-functionality reduces the need for separate configuration mechanisms for different mobility modes.
Data Source
AI summary
A method for selecting a RACH preamble sequence for a high-speed mode and a low-speed mode is disclosed. In the case of acquiring sequence-type information to be used by a specific UE contained in a high-mobility region, a signaling reanalysis method under a general circular shift condition is disclosed, and a method for acquiring sequence-type information via the signaling using the sequence set configured by a restricted circular shift condition is also disclosed. Finally, a method for constructing a sequence set is disclosed.