Layer-2 Relay Transmission Method Reducing D2D Processing Complexity
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Solution Overview
Problem
Conventional Device-to-Device (D2D) relay transmission methods in communication systems involve complex processing across multiple protocol layers, leading to increased complexity and data processing delays.
Innovation Solution
A relay transmission method and device that operates at layer-2, using layer-2 Protocol Data Units (PDUs) with identification information to reduce processing complexity and delay, by omitting the IP layer and utilizing Physical Downlink Control Channels (PDCCH) with Radio Network Temporary Identity (RNTI) for scheduling and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If D2D relay performs decapsulation and encapsulation processing sequentially through layer 1, layer 2, and layer 3, then data transmission can be achieved, but processing complexity is high and data processing delay is long
Solution Approach 1:
The patent extracts the IP layer (layer 3) processing from the relay transmission path, operating exclusively at layer 2. The relay terminal equipment directly processes layer-2 PDUs without performing decapsulation and encapsulation through layer 3, thereby removing unnecessary processing steps and reducing both complexity and delay
Solution Approach 2:
The patent segments the protocol stack processing by separating layer 2 operations from layer 3 operations. The relay terminal equipment handles only layer 2 PDU processing while layer 3 processing is performed separately at the remote terminal equipment and network equipment, avoiding sequential processing through all layers
2Productivity
If D2D relay uses IP layer (layer 3) for data transmission, then comprehensive data processing can be achieved, but the relay process becomes complex and time-consuming
Solution Approach 1:
The patent removes layer 3 processing from the relay terminal equipment's functionality, extracting IP layer operations from the relay path. This extraction simplifies the relay process while maintaining data forwarding capability through optimized layer 2 processing
Solution Approach 2:
The patent performs layer 3 processing in advance at the remote terminal equipment before transmission to the relay, and at the network equipment after reception from the relay. This preliminary action eliminates the need for the relay to perform complex layer 3 processing, improving forwarding efficiency
Data Source
AI summary
Disclosed in the present invention are a relay transmission method and device, enabling reduction of complexity and latency of data processing. The method comprises: a relay terminal apparatus receives a first layer-two PDU sent by a transmitting-end apparatus to a receiving-end apparatus, wherein the first layer-two PDU carries identifier information of a remote terminal apparatus, or the first layer-two PDU schedules a scrambled PDCCH by means of an RNTI of the remote terminal apparatus; the relay terminal apparatus generates, according to the first layer-two PDU, a second layer-two PDU; and the relay terminal apparatus sends to the receiving-end apparatus the second layer-two PDU, 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.