In-band Wireless Relay Time-Division Multiplexing
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Solution Overview
Problem
Wireless communication networks face challenges in extending coverage and improving capacity due to limitations in relay node implementation, particularly in simultaneous frequency band transmission and reception, which affects system performance and introduces interference.
Innovation Solution
The implementation of relay nodes that use the same radio access technology for links between the base station and user equipment, and between the base station and relay nodes, supporting at least Physical Layer, Medium Access Control, and Radio Link Control protocol layers, with classifications based on protocol stack availability, enabling in-band and out-band relay operations to enhance coverage and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If relay nodes use the same frequency band for both backhaul and access links, then spectrum utilization is improved, but interference between simultaneous transmission and reception increases
Solution Approach 1:
The time domain is segmented into different slots for downlink backhaul transmission and uplink access transmission. The relay node transmits backhaul data in downlink slots and receives access data in uplink slots, preventing simultaneous transmission and reception on the same frequency band. This time-division approach resolves the interference issue while maintaining spectrum utilization efficiency.
2Area of stationary object
If relay nodes are deployed to extend coverage, then network coverage is improved, but system complexity increases
Solution Approach 1:
The relay node is designed as a universal device that performs multiple functions: it acts as a base station for downlink backhaul transmission, as a mobile station for uplink access transmission, and as a relay for signal forwarding. This multi-functionality reduces the need for separate dedicated devices for each function, thereby extending coverage while controlling system complexity.
3Ease of manufacture
If in-band relay is used to reduce operational expenses, then cost is reduced, but interference management becomes more difficult
Solution Approach 1:
The relay node employs periodic time-slot allocation where downlink backhaul transmission occurs in specific slots and uplink access transmission occurs in other slots. This periodic alternation creates a structured interference management mechanism that is simpler to implement than continuous frequency separation, reducing operational expenses while maintaining manageable interference levels through temporal multiplexing.
Data Source
AI summary
This invention extends the coverage and improves the capacity of wireless communication networks using relay nodes. The relay nodes are wirelessly connected to the base station. The base station uses the same radio access technology for a link between the base station and user equipment and between the base station and the relay node. The relay node uses the same radio access technology for a link between the base station and the relay node and between the relay node and the user equipment. The relay node supports at least a Physical Layer (PHY), a Medium Access Control (MAC) sub-layer and a Radio Link Control (RLC) sub-layer protocol.