Wireless Device Random Access Priority Backoff Mechanism
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Solution Overview
Problem
Existing wireless network access methods treat all user equipment equally, leading to inefficiencies in connection handovers and reestablishment, particularly under high traffic loads, which can result in increased latency and reduced user satisfaction.
Innovation Solution
Implementing a priority mechanism for random access attempts in wireless networks, where initial backoff times are set based on traffic conditions, and subsequent attempts are adjusted using a backoff multiplier and prioritized power settings to minimize contention and ensure timely access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If equal treatment of all user equipment is applied in random access, then simplicity of access procedure is maintained, but latency increases and user satisfaction decreases under high traffic loads
Solution Approach 1:
The patent applies local quality by differentiating access procedures based on user equipment type and traffic conditions. Different backoff multipliers are assigned to different UE categories (e.g., URLLC, eMBB, mMTC) and access types (e.g., handover, scheduling request, random access), allowing critical services to prioritize access while maintaining simple procedures for standard traffic.
Solution Approach 2:
The backoff multiplier is made dynamic rather than static. The network can adjust the backoff multiplier value based on current traffic conditions, load levels, and service requirements. This dynamic adjustment allows the system to optimize access latency in real-time without requiring complex reconfiguration of the entire access procedure.
2Reliability
If backoff time is increased to reduce contention under high traffic load, then collision probability decreases, but access latency increases
Solution Approach 1:
The patent changes the backoff parameter from a fixed value to a multiplied value based on traffic conditions. The backoff multiplier (configured by gNB) adjusts the effective backoff time dynamically. When traffic load is high, the multiplier increases to reduce collisions; when load is low, the multiplier decreases to minimize latency, thus resolving the contradiction between reliability and speed.
Solution Approach 2:
The network monitors traffic conditions and adjusts the backoff multiplier accordingly, creating a feedback loop. Based on observed collision rates, queue lengths, and traffic patterns, the gNB dynamically modifies the backoff multiplier to optimize the balance between access success rate and latency, ensuring reliable access without excessive delays.
3Ease of operation
If priority-based access is implemented for different user equipment types, then user satisfaction improves, but system complexity increases
Solution Approach 1:
The patent implements priority-based access through local quality differentiation. Different UE types (URLLC, eMBB, mMTC) and access types (handover, scheduling request, random access) are assigned different backoff multiplier values. This allows critical services like handovers and URLLC traffic to access the network with lower effective backoff times, improving user satisfaction without requiring complete redesign of the access control system.
Solution Approach 2:
The backoff multiplier values are pre-configured by the network based on UE type and access type classifications. This preliminary categorization and configuration simplifies the actual access process, as UEs simply apply their assigned multiplier without real-time complex decision-making, reducing operational complexity while maintaining priority-based performance.
Data Source
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AI summary
A method for wireless accessing a node of a radio access network by a wireless device comprises the steps of launching by the wireless device a first access try to a node of said data network through a wireless access channel provided by said node, and if the first access try fails, launching by the wireless device a second access try to a network node through a wireless access channel after expiry of a second backoff time. The second backoff time is set in the wireless device in accordance with a priority value applying to the second access try.