U2U Relay Backoff Handling for Rejected WTRU Connections
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Solution Overview
Problem
Existing wireless communication systems face challenges in handling connection rejections effectively, particularly when a target WTRU rejects connection requests from a source WTRU, leading to inefficiencies and potential congestion.
Innovation Solution
A relay WTRU is introduced to manage connection rejections on behalf of a source WTRU by retrying connection establishment, tracking backoff times, and sending appropriate rejection messages based on predefined thresholds and backoff values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a source WTRU directly attempts connection establishment with a target WTRU upon rejection, then connection establishment speed is improved, but network congestion increases and system stability deteriorates
Solution Approach 1:
The relay WTRU performs preliminary actions by maintaining a backlog of connection requests from multiple source WTRUs and proactively attempting connection establishment with the target WTRU before the sources would otherwise retry. This preliminary action prevents subsequent congestion when sources simultaneously retry after backoff periods expire.
Solution Approach 2:
The relay WTRU acts as an intermediary between source WTRUs and the target WTRU. It receives connection requests from sources, manages them in a backlog, and coordinates retry attempts with the target. This intermediary role smooths out traffic patterns and prevents direct congestion between sources and target while maintaining connection establishment progress.
2Reliability
If a relay WTRU performs multiple retry attempts on behalf of source WTRUs, then connection establishment success rate is improved, but relay device complexity increases
Solution Approach 1:
The relay WTRU performs multiple functions: it acts as a connection manager for multiple sources, maintains backlogs, coordinates with the target WTRU, and handles retry logic. This multi-functionality consolidates what would otherwise be distributed complexity across multiple source devices into a single relay device, improving overall reliability without proportionally increasing total system complexity.
Solution Approach 2:
The relay WTRU autonomously manages the connection establishment process for multiple sources without requiring direct intervention from each source. It self-manages the backlog, determines when to retry based on target responses, and coordinates retransmissions independently, reducing the operational complexity burden on source devices.
3Object-affected harmful factors
If backoff times are enforced strictly after rejection, then network congestion is reduced, but connection establishment time increases
Solution Approach 1:
While source WTRUs are enforcing backoff and waiting, the relay WTRU continuously attempts connection establishment with the target WTRU on their behalf. This continuous useful action ensures that when the backoff period expires and sources retry, the connection can be established immediately if successful, minimizing the effective connection establishment time while maintaining congestion control.
Solution Approach 2:
The relay performs connection attempts preliminarily during the source backoff period. By the time the source backoff expires, the relay may have already successfully established the connection or determined failure, making the source's subsequent retry action redundant but harmless. This preliminary action effectively reduces the perceived connection establishment time from the source perspective while maintaining backoff discipline.
Data Source
AI summary
Systems and methods are described herein for handling connection rejects via a wireless transmit/receive unit (WTRU)-to-WTRU (U2U) relay associated with backoff times on behalf of a source end WTRU. A relay WTRU may retry to establish connection with a target WTRU on behalf of a source WTRU, for example, based on receiving a rejection (e.g., with a backoff value) from the target WTRU. The source WTRU may associate the reject message to the target WTRU, and the relay WTRU may be available to reach other target WTRUs. The relay WTRU may send a reject message to other source WTRUs (e.g., if the back off duration is active, running) for the same target WTRU.