Relay Network Scheduling via Transmission Time Difference
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Solution Overview
Problem
Current relay technologies in 4G LTE and new radio (NR) systems face challenges in flexible resource allocation between backhaul and access links due to half-duplex constraints, leading to inefficient use of resources and conflicts between signal sending and receiving.
Innovation Solution
A scheduling method that determines and communicates the transmission time difference between control and data channels on a link, allowing for dynamic scheduling and resource allocation between backhaul and access links, enabling flexible resource utilization and conflict avoidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resources are reserved for backhaul link transmission, then sending and receiving conflict is avoided, but unoccupied backhaul resources cannot be used for access link
Solution Approach 1:
The patent introduces dynamic resource allocation mechanisms where the relay node can flexibly switch between reserving resources for backhaul transmission and making them available for access link transmission based on real-time traffic conditions. The system dynamically adjusts resource reservation policies to balance conflict avoidance with resource utilization efficiency.
Solution Approach 2:
The patent changes the parameter of resource reservation from static to dynamic by introducing timing information and conditional reservation mechanisms. The system modifies reservation behavior based on transmission timing, traffic conditions, and link status to optimize both conflict avoidance and resource utilization.
2Reliability
If relay node reserves resources for backhaul link, then half-duplex conflict is avoided, but resource utilization efficiency decreases
Solution Approach 1:
The patent applies partial reservation strategy where the relay node reserves resources for backhaul transmission only when necessary, rather than continuously reserving resources. This partial action approach reduces unnecessary resource reservation overhead and improves overall resource utilization efficiency while maintaining conflict avoidance where needed.
Solution Approach 2:
The relay node autonomously determines when to reserve resources for backhaul transmission based on local traffic conditions and link status. The self-service mechanism allows the relay to make intelligent decisions about resource reservation without continuous external control, optimizing both conflict avoidance and resource utilization efficiency.
3Reliability
If fixed resource reservation is used for backhaul link, then sending and receiving conflict is avoided, but scheduling flexibility is reduced
Solution Approach 1:
The patent transforms fixed resource reservation into dynamic reservation mechanisms that adapt to changing network conditions. The system introduces timing information, conditional reservation, and flexible resource allocation that allow the relay node to adjust scheduling decisions in real-time while maintaining conflict avoidance guarantees.
Data Source
AI summary
A scheduling method implements flexible scheduling in a relay network. A method includes: determining, by a first device, information about a transmission time difference, where the transmission time difference is a time difference between a control channel of a first link and a data channel that is of the first link and that is scheduled by the control channel of the first link; notifying a second device of the information about the transmission time difference; and performing, by the second device, scheduling based on the information about the transmission time difference. In this way, the second device determines whether a resource needs to be reserved for the data channel of the first link, and it is possible that a time division resource, a frequency division resource, or a space division resource is shared for data of the first link and data of a second link.