RACH Priority Payload for Latency Reduction
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Solution Overview
Problem
Current wireless communication systems lack mechanisms to prioritize random access channel (RACH) procedures effectively, leading to increased latency in urgent situations such as handover or beam failure recovery, as they do not differentiate between RACH procedures based on priority.
Innovation Solution
The implementation of a method where user equipment (UE) generates a payload in the preamble message to indicate a higher priority for specific RACH procedures, such as handover or beam failure recovery, allowing for shorter response windows and different power-ramping steps, enabling quicker uplink timing synchronization and grant acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If all RACH procedures are treated equally without priority differentiation, then the system maintains simplicity in procedure handling, but latency increases in urgent scenarios such as handover or beam failure recovery
Solution Approach 1:
The patent introduces priority parameters (e.g., priority indicators, urgency flags) that modify the behavior of RACH procedures. Different priority levels trigger different response window durations, power-ramping steps, and procedural handling, allowing urgent procedures to be expedited without fundamentally changing the overall RACH framework
Solution Approach 2:
The patent segments RACH procedures into different priority categories (e.g., high priority for handover/beam failure recovery, normal priority for initial access). This segmentation allows the system to apply different handling rules to different procedure types while maintaining a unified RACH mechanism
2Reliability
If the response window duration is extended to accommodate all RACH procedures, then reliability of response reception improves, but latency increases for high-priority procedures that require faster response
Solution Approach 1:
The patent applies different response window durations based on the local characteristics of each RACH procedure's priority level. High-priority procedures receive shorter response windows with expedited handling, while normal-priority procedures use standard response windows, optimizing both speed and reliability for each case
3Reliability
If power-ramping steps are increased to ensure successful preamble transmission, then reliability of uplink synchronization improves, but energy consumption increases
Solution Approach 1:
The patent implements dynamic power-ramping adjustments based on RACH procedure priority and previous transmission outcomes. High-priority procedures may use more aggressive power-ramping to ensure rapid successful transmission, while normal-priority procedures use conservative power-ramping to minimize energy consumption, adapting the strategy to each situation
Data Source
AI summary
In an aspect of the disclosure, a first method, a first computer-readable medium, and a first apparatus are provided. The first apparatus may be a UE. The first apparatus may generate a payload of a first preamble message associated with a first RACH procedure, and the payload may indicate a first priority of the first RACH procedure that is relatively higher than a second priority of a second RACH procedure. The first apparatus may send the first preamble message including a RACH preamble and the payload to a base station, and the first preamble message may indicate an identifier (ID) of the first apparatus.