Early Termination of Random Access Response Reception in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing latency and power consumption during random access procedures, particularly in scenarios with network overload or varying channel conditions, leading to inefficient resource allocation and increased contention between user equipment (UEs).
Innovation Solution
A method where User Equipment (UE) receives an indicator to early terminate the Random Access Response (RAR) reception step if certain conditions are met, such as channel quality thresholds or number of preamble transmissions, allowing the UE to stop monitoring the Physical Downlink Control Channel (PDCCH) addressed by the RA-RNTI, even if the RAR window has not ended, thereby prioritizing resource usage and reducing contention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors the PDCCH addressed by RA-RNTI throughout the entire RAR window, then the reliability of receiving random access response is improved, but the power consumption and latency increase
Solution Approach 1:
The eNB transmits an indicator in the eNB signal to the UE before the RAR window ends, preliminarily indicating that the UE should stop monitoring PDCCH. This allows the UE to terminate monitoring early without sacrificing reliability, as the indicator is sent in advance to coordinate the early termination action.
Solution Approach 2:
The eNB sends feedback information (the indicator) to the UE during the random access procedure to control the UE's monitoring behavior. This feedback mechanism enables the network to dynamically adjust the UE's action based on current system conditions, allowing early termination when appropriate while maintaining reliability when needed.
2Reliability
If the UE continuously monitors the PDCCH addressed by RA-RNTI throughout the entire RAR window, then the reliability of receiving random access response is improved, but the latency increases
Solution Approach 1:
The eNB transmits an indicator in the eNB signal to the UE before the RAR window ends, preliminarily indicating that the UE should stop monitoring PDCCH. This allows the UE to terminate monitoring early without sacrificing reliability, as the indicator is sent in advance to coordinate the early termination action.
Solution Approach 2:
The monitoring duration is made dynamic rather than fixed. The UE adjusts its monitoring behavior based on real-time conditions and network indicators, transitioning from continuous monitoring to early termination when the indicator is received, thereby optimizing latency while maintaining reliability.
3Device complexity
If the eNB waits for the RAR window to end before terminating monitoring, then the simplicity of the procedure is maintained, but the productivity and resource allocation efficiency decrease
Solution Approach 1:
The RAR window is segmented into two parts: a first period where the UE monitors PDCCH continuously, and a second period where the UE stops monitoring based on the indicator. This segmentation allows the procedure to maintain simplicity through clear phase division while achieving improved resource allocation efficiency through early termination.
Solution Approach 2:
The eNB transmits an indicator in the eNB signal to the UE before the RAR window ends, preliminarily indicating that the UE should stop monitoring PDCCH. This allows the UE to terminate monitoring early without sacrificing reliability, as the indicator is sent in advance to coordinate the early termination action.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for operating fast random access procedure in a wireless communication system, the method comprising: starting a Random Access Response (RAR) reception procedure by transmitting a Random Access Preamble (RAP) to an e-NodeB (eNB); receiving, from the eNB, an indicator indicating that the UE check a condition for whether the UE stops the RAR reception procedure or not, checking whether the condition is met or not; and stopping RAR reception procedure if the condition is met.