5G Random Access Backoff Using Early Contention-Free Resources
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Solution Overview
Problem
The existing random access backoff mechanism in 5G wireless communication systems leads to unnecessary delays and increased collisions due to the inefficient use of contention-free random access resources, particularly in scenarios with channel congestion.
Innovation Solution
A method and apparatus that allow a terminal to determine criteria for selecting contention-free random access resources during a backoff timer, enabling early transmission of random access preambles when suitable synchronization signals are available, thereby reducing unnecessary delays and collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal waits for the backoff timer to expire before transmitting random access preambles, then collision probability is reduced, but access delay increases
Solution Approach 1:
The patent makes the random access procedure dynamic by allowing the terminal to adaptively switch between contention-based and contention-free random access modes based on real-time channel conditions and available resources. The terminal monitors for synchronization signals and contention-free resources during the backoff period, and can early-terminate the backoff timer when suitable resources become available, thus dynamically optimizing between collision avoidance and access speed.
Solution Approach 2:
The patent enables preliminary action by allowing the terminal to prepare and select contention-free random access resources in advance during the backoff timer period. When the terminal detects synchronization signals and identifies available contention-free resources before the backoff timer expires, it can pre-select these resources and early-transmit the random access preamble, eliminating the need to wait for the backoff timer to expire.
2Reliability
If the backoff timer is strictly enforced, then random access collision is reduced, but procedure efficiency decreases
Solution Approach 1:
The patent introduces dynamic behavior to the previously static backoff timer mechanism. The terminal continuously monitors channel conditions and contention-free resource availability during the backoff period, and can adaptively early-terminate the timer when optimal conditions are detected. This dynamic approach maintains collision reduction benefits while significantly improving procedure efficiency by avoiding unnecessary waiting when resources are available.
Solution Approach 2:
The terminal performs self-service by autonomously monitoring for synchronization signals and contention-free random access resources during the backoff period, and independently deciding when to early-terminate the backoff timer and proceed with transmission. This self-service mechanism eliminates the need for strict backoff enforcement while maintaining collision avoidance through intelligent resource selection.
3Speed
If contention-free resources are utilized early, then access speed increases, but resource availability requirements increase
Solution Approach 1:
The patent applies local quality by enabling early contention-free random access only in specific local conditions where synchronization signals are detected and contention-free resources are available. The terminal adaptively switches to early access mode locally when conditions permit, while maintaining standard backoff behavior in other scenarios. This localized application of early access optimizes speed where possible without requiring universal resource availability.
Data Source
AI summary
A communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for internet of things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology. The present disclosure provides a method and an apparatus for performing a random access by a terminal in a wireless communication system by starting a backoff timer for a random access preamble retransmission, determining whether a criterion to select a contention free random access resource is met during the backoff timer, selecting a random access resource for a transmission of a random access preamble when the criterion is met during the backoff timer, and transmitting, to a base station, the random access preamble in the selected random access resource.