PDCCH-Triggered RACH Occasion Adaptation for Lower Access Latency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communications systems face challenges in complex and dynamic environments that lead to signal attenuation, increased latency, and potential collisions due to sparse RACH configurations, which affect network energy efficiency and performance.
Innovation Solution
Implementing PDCCH order-based adaptation of RACH configuration to dynamically activate additional RACH occasions, reducing latency and collision likelihood while maintaining energy savings through sparse RACH configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a sparse RACH configuration is used, then network energy efficiency is improved, but latency increases and collision risk increases
Solution Approach 1:
The patent implements dynamic RACH configuration adaptation where the network can switch between sparse and dense RACH configurations based on real-time conditions. The network entity monitors random access activity and dynamically adjusts the RACH configuration index to activate additional RACH occasions when latency or collision risk increases, while maintaining sparse configuration when conditions are stable to preserve energy efficiency.
Solution Approach 2:
The patent changes the RACH configuration parameter dynamically by receiving an indication from the network entity to adapt the RACH configuration. This involves modifying the RACH configuration index to activate additional RACH occasions, thereby changing the system behavior from sparse to dense configuration when needed, while maintaining the ability to return to sparse mode for energy savings.
2Use of energy by moving object
If a sparse RACH configuration is used, then network energy efficiency is improved, but collision risk increases
Solution Approach 1:
The system dynamically adapts the RACH configuration based on detected collisions or near-miss conditions. When the network entity detects random access collisions or predicts high collision risk, it sends an indication to the UE to activate additional RACH occasions, thereby reducing collision risk while maintaining energy efficiency during normal operation.
Solution Approach 2:
The patent implements a feedback mechanism where the network entity monitors random access activity and collision conditions, then provides feedback by sending an indication to the UE to adapt the RACH configuration. This closed-loop feedback allows the system to respond to collision risks and adjust the RACH configuration accordingly, balancing reliability and energy efficiency.
3Loss of time
If additional RACH occasions are activated, then latency is reduced and collision risk is reduced, but device complexity increases
Solution Approach 1:
The patent reduces device complexity by implementing dynamic RACH configuration adaptation where the UE can switch between different RACH configurations based on network indications. The UE monitors the RACH configuration index and adjusts its behavior accordingly, allowing the system to activate additional RACH occasions only when needed to reduce latency, while maintaining simpler operation during normal conditions.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for random access channel (RACH) configuration. A method for wireless communications by an apparatus comprising: transmitting an indication of a random access channel (RACH) configuration indicating one or more RACH occasions (ROs); transmitting a physical downlink control channel (PDCCH) order comprising a first indication, wherein the first indication indicates activation of an adaptation of the RACH configuration, wherein the adaptation of the RACH configuration adapts the RACH configuration to further indicate one or more additional ROs; and monitoring the one or more ROs and the one or more additional ROs