MAC Layer Relay Transmission for D2D Latency Reduction
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Solution Overview
Problem
Conventional Device-to-Device (D2D) relay technologies face high complexity and long data processing delays due to the need for sequential processing across multiple layers (L1 to L3) in the Internet Protocol (IP) layer for data relaying between D2D terminals and network equipment.
Innovation Solution
Implementing a bottom-layer relay method where the relay terminal equipment processes and forwards data frames directly at the Media Access Control (MAC) layer, reducing the need for higher-layer processing and utilizing relay-specific identifiers and resources for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data relaying is performed through sequential processing across Layer 1, Layer 2, and Layer 3, then complete protocol handling is achieved, but relay transmission complexity increases and data processing delay increases
Solution Approach 1:
The patent segments the relay transmission process by introducing a dedicated relay transmission layer that handles only the essential relaying function, separating it from the complete protocol stack processing. This allows the relay node to process data without performing full de-capsulation and re-encapsulation across all layers, thereby reducing complexity while maintaining reliability.
Solution Approach 2:
The patent extracts the relay transmission function from the conventional multi-layer protocol processing by introducing a specific relay transmission layer. This extracted layer handles only the necessary relaying operations, removing the burden of sequential processing through L1, L2, and L3 at relay nodes, thus reducing complexity while preserving essential protocol handling.
2Reliability
If data relaying is performed through sequential processing across Layer 1, Layer 2, and Layer 3, then complete protocol handling is achieved, but data processing delay increases
Solution Approach 1:
By segmenting the relay function into a dedicated layer, the patent enables parallel or simplified processing paths that avoid the sequential delays of traditional multi-layer processing. The relay transmission layer can operate independently and efficiently, reducing the time required for data relaying while maintaining protocol integrity.
Solution Approach 2:
The patent establishes the relay transmission layer in advance within the protocol stack structure, allowing relay nodes to be pre-configured with the necessary processing capabilities. This preliminary setup eliminates the need for dynamic multi-layer processing during actual data transmission, thereby reducing processing delay while ensuring reliable protocol handling.
3Reliability
If a D2D relay relays data through IP layer (Layer 3), then complete protocol processing is performed, but relay transmission complexity increases
Solution Approach 1:
The patent segments the protocol processing responsibilities by introducing a dedicated relay transmission layer that handles only the essential relaying function. This segmentation allows the relay node to bypass complex de-capsulation and re-encapsulation operations across L1, L2, and L3, reducing transmission complexity while maintaining complete protocol processing through the specialized layer.
4Adaptability or versatility
If conventional D2D relay technology is used with sequential layer processing, then protocol compatibility is maintained, but system performance decreases due to high complexity and long delay
Solution Approach 1:
The patent implements a relay transmission layer that can operate within existing protocol stacks, making it universally compatible with current D2D and cellular communication systems. This multi-functional layer can handle both traditional and relayed traffic efficiently, maintaining protocol compatibility while significantly improving system performance by reducing complexity and processing delay.
Data Source
AI summary
Disclosed in the present invention are a relay transmission method and, device, enabling reduction of complexity of relay transmission and a decrease of transmission latency. The method comprises: a relay terminal apparatus receives a first lower-level data frame sent by a transmitting-end apparatus to a receiving-end apparatus, wherein the first lower-layer data frame is obtained by the transmitting-end apparatus by means of processing a MAC PDU carrying identifier information of a remote terminal apparatus; the relay terminal apparatus determines, at the lower layer, whether the first lower layer data frame is required to be forwarded; and the relay terminal apparatus forwards, at the lower layer, the first lower-layer data frame, wherein the transmitting-end apparatus is the remote terminal apparatus, and the receiving-end apparatus is a network apparatus; alternatively, the transmitting-end apparatus is a network apparatus, and the receiving-end apparatus is the remote terminal apparatus.