MAC Layer Load Information Transmission in LTE Relay Networks
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Solution Overview
Problem
In wireless communication systems, particularly in LTE-Advanced networks, the transfer of load information between access nodes and relay nodes via wireline connections is inefficient, leading to high latency and protocol overhead, which hampers interference coordination and resource management, especially in scenarios with high-frequency bands and shadowing environments.
Innovation Solution
Implementing a method to transmit load information through a Media Access Control (MAC) layer channel over the backhaul link between eNodeBs and RNs, using newly defined MAC control elements and logical channel identification values to convey High Interference Indication (HII) and Overload Indication (OI) messages, reducing latency and protocol overhead by lowering the message location in the protocol stack and enabling efficient interference coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If load information is transferred via wireline connections between access nodes and relay nodes, then connection stability is maintained, but latency increases and protocol overhead increases
Solution Approach 1:
The patent replaces the wireline connection mechanism with a wireless MAC layer communication mechanism. Instead of using traditional wired backhaul connections for load information transfer, the system uses MAC control elements transmitted over the wireless backhaul link, eliminating the need for complex wireline infrastructure and reducing associated overhead and latency.
Solution Approach 2:
The patent moves the load information transfer from the traditional wireline physical layer to the MAC layer of the wireless protocol stack. This dimensional shift allows the system to leverage wireless communication capabilities for backhaul traffic, integrating load information transfer with the existing wireless access link management mechanisms.
2Area of stationary object
If relay nodes are introduced to extend coverage, then network coverage is improved, but interference coordination complexity increases
Solution Approach 1:
The patent enables relay nodes to autonomously manage interference coordination by directly exchanging load information with neighboring relay nodes through the MAC layer. Each relay node independently monitors and reports its own load status, eliminating the need for centralized coordination and reducing the complexity of managing interference in extended coverage areas.
Solution Approach 2:
The patent implements a feedback mechanism where relay nodes continuously exchange load information through MAC control elements. This feedback loop allows relay nodes to adapt their transmission parameters based on real-time load conditions from neighboring cells, enabling dynamic interference coordination that scales efficiently with network coverage expansion.
Data Source
AI summary
An apparatus includes means for providing load information, said load information for sending from one of an access node and a relay node associated with said access node to the other of said relay node and access node.