Sidelink Relay Feedback and Traffic Differentiation for Reliable Relaying
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Solution Overview
Problem
Existing wireless communication systems lack an overall feedback mechanism for the transmitting entity to determine the success or failure of transmissions relayed through a relay node, and there is a need to differentiate between control and data traffic intended for the relay node versus the receiving entity.
Innovation Solution
Implementing a feedback mechanism where the relay node transmits HARQ feedback to the transmitting entity indicating successful or unsuccessful receipt of transmissions at the receiving entity, and differentiating between transmissions intended for relaying and those meant for the relay node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a relay node is introduced to extend wireless coverage and support connectivity, then the coverage area and connectivity are improved, but the complexity of the communication system increases due to the need for feedback mechanisms and traffic differentiation
Solution Approach 1:
The patent segments the feedback mechanism into two distinct parts: HARQ feedback for transmission reliability and RLC feedback for traffic differentiation. This segmentation allows the system to handle different types of information separately, improving clarity and reducing the complexity of managing combined feedback streams. The relay node can process and forward specific feedback types independently, making the overall system more manageable despite the added complexity of relay operations.
Solution Approach 2:
The relay node acts as an intermediary between the transmitting entity and the receiving entity, facilitating communication while implementing intelligent feedback handling. The relay node receives feedback from the receiving entity, determines whether it is HARQ or RLC feedback based on traffic differentiation information, and forwards the appropriate feedback to the transmitting entity. This intermediary role enables coverage extension while maintaining structured feedback management that mitigates system complexity.
2Reliability
If feedback mechanisms are implemented for relayed transmissions, then transmission reliability is improved, but the communication overhead and processing complexity increase
Solution Approach 1:
The feedback mechanism is segmented into HARQ feedback (for error correction and retransmission decisions) and RLC feedback (for traffic type identification). This segmentation allows the relay node to process different feedback types through dedicated logic paths, reducing the cognitive load and processing complexity compared to handling undifferentiated feedback. The transmitting entity can also optimize its operations by processing specific feedback types independently.
Solution Approach 2:
The patent implements preliminary traffic differentiation at the relay node before forwarding feedback to the transmitting entity. The relay node预先 determines the type of feedback (HARQ or RLC) using traffic differentiation information, allowing the transmitting entity to prepare appropriate processing routines in advance. This preliminary classification reduces the processing complexity at the transmitting entity when the actual feedback arrives, as it can immediately route the feedback through the appropriate processing path.
3Productivity
If traffic differentiation is implemented at the relay node, then communication efficiency is improved, but the device complexity of the relay node increases
Solution Approach 1:
Traffic differentiation is segmented into distinct identification and processing stages. The relay node uses traffic differentiation information (such as specific fields in control messages or resource allocation patterns) to identify whether a transmission is for relaying or for the relay node itself. This segmented approach allows the relay node to implement differentiation logic in a modular fashion, improving communication efficiency while managing complexity through structured design.
Solution Approach 2:
The patent applies local quality by implementing traffic differentiation specifically at the relay node where it is most needed, rather than throughout the entire system. The relay node has the specific capability to differentiate traffic types, while the transmitting and receiving entities focus on their primary functions. This localized implementation improves communication efficiency at the critical relay point without unnecessarily increasing complexity across all system components.
Data Source
AI summary
A user device, UE, for a wireless communication network, acta as a relay UE so as to provide functionality to support connectivity between a transmitting entity and one or more receiving entities of the wireless communication network. The UE differentiates a transmission, which is received from the transmitting entity, between a first transmission to be relayed to a receiving entity and a second transmission that is intended for the UE. The UE differentiates the received transmission by control information associated with the transmission and/or resources on which the transmission and/or the associated control information is received.