Wireless Communication Node Random Access Timing Management
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in supporting random access in Non-Terrestrial Networks (NTN) due to large delay differences, which are not effectively addressed by current designs optimized for terrestrial communications.
Innovation Solution
A method for wireless communications that involves grouping User Equipments (UEs) based on measurement results to reuse existing preamble designs or reduce time-domain resources, configuring specific time and frequency resources, and using flexible signaling to manage timing advances, thereby reducing resource overhead and ambiguity in random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing random access design is used for NTN, then device complexity is reduced, but reliability deteriorates due to large delay differences
Solution Approach 1:
The patent segments the random access procedure into distinct phases: a first phase for initial access and a second phase for timing adjustment. This segmentation allows the system to handle large delay differences by separating the random access process into manageable parts, each optimized for specific timing conditions, thereby improving reliability without significantly increasing overall complexity.
Solution Approach 2:
The patent introduces a preliminary action where the network provides timing advance information before the actual random access transmission. This preliminary timing adjustment prepares the UE for the upcoming transmission, accounting for large delay differences in advance, which improves access reliability while keeping the procedure relatively simple.
2Reliability
If larger time window is used for random access response, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent dynamically adjusts the time window parameters based on the specific access scenario and network conditions. Rather than using a fixed large time window, the system adapts the timing advance and response window to match the actual delay characteristics, improving reliability while minimizing time loss.
Solution Approach 2:
The patent implements feedback mechanisms where the network provides timing advance information to the UE based on measured delay conditions. This feedback allows the system to optimize the time window parameters dynamically, ensuring reliable access responses while reducing unnecessary time delays.
3Measurement precision
If multiple candidate measurement intervals are used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent changes the measurement interval parameter based on the specific access scenario and network conditions. Instead of using multiple fixed candidate intervals, the system dynamically selects appropriate interval lengths that match the actual delay characteristics, improving measurement precision while avoiding the complexity of managing multiple predetermined intervals.
Data Source
AI summary
The present disclosure provides a method and a device in a communication node for wireless communications. A communication node receives first information; determines a target measurement interval, the target measurement interval is one of X candidate measurement intervals; transmits a first signal, the first signal occupies a target time-frequency resource block; monitors a first-type signaling in a target time window; the X candidate measurement intervals respectively correspond to X time interval lengths, and the first information is used to determine a corresponding time interval length for each of the X candidate measurement intervals; a length of a time interval between a start time of the target time window and a reference time is equal to a target time interval length, the target time interval length is a time interval length corresponding to the target measurement interval in the X time interval lengths. The present disclosure improves random access performance.