Local Manager HARQ Scheduling for Wireless Cellular Sidelink
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Next-generation wireless cellular communication systems, such as 5G, face challenges in managing local traffic and ensuring seamless connectivity for services like vehicular communications, where traditional handover procedures are inadequate due to the need for dynamic scheduling and acknowledgement mechanisms in sidelink transmissions between user equipment nodes.
Innovation Solution
Implementing a Hybrid Automatic Repeat Request (HARQ) and scheduling system that utilizes a local manager node (Node-S) to send common downlink control information to transmitting and receiving nodes (Node-T and Node-R) via sidelink interfaces, enabling explicit and implicit acknowledgement of data transmission and facilitating unicast and broadcast/multicast schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional handover procedures are used for user equipment moving between base stations, then connectivity is maintained, but dynamic scheduling and acknowledgement mechanisms are insufficient for local traffic management in sidelink transmissions
Solution Approach 1:
The system segments the traditional base station control function into separate roles: a first node (local manager/Node-S) that performs scheduling control and a second node (transmitter/Node-T) that performs data transmission. This segmentation allows independent optimization of scheduling decisions and data transmission, enabling HARQ mechanisms to operate effectively in sidelink communications while maintaining adaptability to local traffic management requirements.
Solution Approach 2:
The patent introduces downlink control information as an intermediary mechanism that carries scheduling decisions from the first node to the second node. This intermediary enables the system to maintain reliable data transmission through explicit scheduling control while allowing the nodes to adapt to local traffic conditions. The downlink control information acts as a mediator that coordinates the interaction between scheduling and transmission functions.
2Device complexity
If a single base station serves the entire geographic area, then control is simplified, but local traffic management and dynamic scheduling capabilities are limited
Solution Approach 1:
The control function is segmented between multiple nodes: the first node (local manager) handles scheduling decisions and the second node (transmitter) handles data transmission. This segmentation enables sophisticated local traffic management while distributing the control burden, making the system more adaptable to dynamic local conditions without requiring a completely complex centralized control structure.
Solution Approach 2:
The system dynamically assigns roles and scheduling decisions based on local traffic conditions. The first node can schedule transmissions adaptively, and the second node can perform transmissions with HARQ feedback mechanisms. This dynamic capability allows the system to respond to changing local traffic patterns while maintaining a relatively simple overall control architecture that builds complexity only where needed.
3Reliability
If explicit acknowledgement mechanisms are implemented for data transmission, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent implements feedback through HARQ (Hybrid Automatic Repeat Request) mechanisms where the second node sends acknowledgement information back to the first node. This feedback loop enables the system to improve transmission reliability by detecting and correcting errors without requiring complex error correction codes. The feedback mechanism is integrated into the existing communication protocol, adding reliability while minimizing the increase in system complexity.
Solution Approach 2:
The system changes the parameter of transmission reliability through hybrid ARQ mechanisms that combine automatic repeat requests with channel feedback. Instead of fundamentally changing the system architecture to improve reliability, the patent modifies transmission parameters and control information to achieve reliable data delivery. This approach improves reliability while keeping the complexity increase manageable by working within the existing protocol framework.
Data Source
AI summary
The disclosed subject matter is directed towards scheduling and Hybrid Automatic Repeat Request (HARQ) operations by which nodes in a three party communication system can communicate. To schedule a data transmission from a transmitter node to receiver node(s), a local manager/scheduler node sends common downlink control information to the transmitter and receiver nodes. Via a scheduling request, the transmitting node can request the scheduling of the data transmission by the local manager node. The technology facilitates unicast and broadcast/multicast data transmissions; for a unicast data transmission, the scheduling request identifies the receiving node. The transmitting node can explicitly acknowledge reception of the downlink control information to the local manager node, or the local manager node can detect the data transmission, when it occurs, as an implicit acknowledgment that the common downlink control information was successfully received.