Multi-hop Relay Frame Structure for Interference-Free Signal Routing
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Solution Overview
Problem
Conventional relay stations in mobile communication systems require two RF devices and are costly to implement interference cancellation, making it difficult to form a Mobile Multi-hop Relay (MMR) system with multiple hops, as the frame structure becomes overly complex.
Innovation Solution
A method and frame structure for relay stations that allow simultaneous data reception from both higher and lower layers and transmission to both layers, simplifying the RF device structure and eliminating the need for additional interference cancellation functions, applicable to both two-hop and multi-hop MMR systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional relay station receives signals from a base station and simultaneously re-transmits signals to terminals, then signal relay function is achieved, but two RF devices are required and interference cancellation is needed
Solution Approach 1:
The frame structure is segmented into distinct receive zones and transmit zones. During receive zones, the relay station receives signals from higher layers; during transmit zones, it transmits signals to lower layers. This temporal segmentation eliminates the need for simultaneous transmission and reception, removing the requirement for two RF devices and interference cancellation functions.
Solution Approach 2:
The relay station operates in periodic cycles of receiving and transmitting. The frame structure alternates between receive zones (for receiving from higher layers) and transmit zones (for transmitting to lower layers). This periodic action allows single RF device to handle both functions sequentially, reducing device complexity while maintaining reliable signal relay.
2Object-affected harmful factors
If interference cancellation function is added to conventional relay station, then signal interference is reduced, but costs and implementation effort increase
Solution Approach 1:
The harmful interference issue is extracted and eliminated by fundamentally changing the operational mode. Instead of adding interference cancellation to the conventional simultaneous transmit-receive architecture, the patent extracts the interference problem by implementing sequential operation through frame structure segmentation. This removes the need for costly interference cancellation functions while maintaining signal quality.
3Adaptability or versatility
If conventional frame structure is applied to multi-hop MMR system, then basic communication is supported, but frame formation becomes too complicated for three or more hops
Solution Approach 1:
The frame structure is designed with universal applyability to multi-hop systems of any depth. By segmenting frames into receive zones and transmit zones that can be recursively applied at each hop level, the same basic frame structure serves multiple functions across two-hop, three-hop, and beyond systems. This universal design prevents frame formation complexity from increasing with system scale.
Solution Approach 2:
The frame structure implements a nested organization where each relay station's frame is composed of receive zones and transmit zones that can contain nested frames from lower-layer relay stations. This nested doll structure allows the same frame format to scale recursively through multiple hops without increasing complexity, as each level uses the identical structural template.
Data Source
AI summary
A method of forming a frame in a Mobile Multi-hop Relay (MMR) system, and a system for implementing the method are provided. In a multi-hop relay system, when a relay station of a specific layer receives data, the relay station receives data from both a higher layer and a lower layer. When the relay station transmits data, the relay station transmits data to both the higher layer and the lower layer. By doing so, data reception and data transmission are exclusively performed without interfering with each other, and the method and the system are easily applied to the multi-hop MMR system.