L3 Relay Protocol Stack Scheduler for Wireless Coverage
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Solution Overview
Problem
Wireless communication networks face challenges in extending coverage and improving capacity due to limitations in existing relay node technologies, particularly in implementing relay nodes that can efficiently transmit and receive signals on the same frequency band simultaneously, leading to interference and performance degradation.
Innovation Solution
The introduction of a Relay Node (RN) in the Radio Access Network (RAN) that wirelessly connects between Base Station nodes and User Equipment, using the same radio access technology for both links and classified into different types based on protocol layers, such as L0/L1, L2, and L3 relays, which enable advanced functions like scheduling and Hybrid Automatic Repeat Request (HARQ), and in-band relays that aggregate user equipment traffic on a single transport channel to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a relay node transmits and receives signals on the same frequency band simultaneously, then network coverage and capacity are extended, but interference occurs and performance degrades
Solution Approach 1:
The relay node's operation is segmented into separate time slots for transmission and reception on the same frequency band. The relay node alternates between transmitting backhaul signals to the donor base station and receiving/access signals from user equipment, preventing simultaneous transmission and reception that would cause self-interference while still enabling coverage extension.
Solution Approach 2:
The relay node employs periodic time-division multiplexing where transmission and reception operations occur in periodic cycles. During designated transmission time slots, the relay node transmits signals to the donor base station, and during reception time slots, it receives signals from user equipment, creating a periodic pattern that avoids continuous interference.
2Adaptability or versatility
If multiple protocol layers are implemented in the relay node, then advanced functions like scheduling and HARQ are enabled, but device complexity increases
Solution Approach 1:
The relay node implements a universal protocol stack structure that can operate at multiple protocol layers (L0/L1, L2, or L3) depending on deployment requirements. The same basic relay node architecture supports different levels of protocol layer implementation, allowing it to perform basic signal relaying or advanced functions like scheduling and HARQ based on network needs without requiring fundamentally different hardware designs.
3Object-affected harmful factors
If in-band relay is used to aggregate user equipment traffic, then interference is minimized, but backhaul overhead increases
Solution Approach 1:
The in-band relay architecture merges the user equipment access traffic with the backhaul traffic on the same frequency band by aggregating multiple user equipment streams into a single combined signal for transmission to the donor base station. This consolidation minimizes interference by reducing the number of simultaneous transmissions while the protocol layer handling efficiently manages the aggregated traffic to control backhaul overhead.
Data Source
AI summary
This invention is a method for extending the coverage and/or improving the capacity of wireless communication networks comprising inserting a Relay Node (RN) in the Radio Access Network (RAN). The relay node relays the signal between the Base Station node (eNB) and the User Equipment (UE). The relay node is wirelessly connected to the base station. The base station uses the same radio access technology (RAT) for the base station to user equipment link and the base station to relay node link. The relay node uses the same radio access technology for the base station to relay node link and the relay node to user equipment link. The relay node is non-transparent and seen as base station by the user equipment.