Relay Terminal Device Layer 2 Adaptation Protocol Stack
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Solution Overview
Problem
Conventional Device-to-Device (D2D) relay technologies experience high complexity and long data processing delays due to the use of IP layer 3 for data relay between D2D terminals and network devices, which affects system performance.
Innovation Solution
Implementing a method and device for relay transmission that uses a layer 1 and layer 2 protocol stack, excluding layer 3, where the relay terminal device recognizes and forwards data using identifier information within the ADP-layer PDU, reducing processing complexity and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If layer 3 (IP layer) is used for data relay processing, then data transmission reliability is improved, but processing complexity and transmission delay increase significantly
Solution Approach 1:
The patent extracts and removes layer 3 (IP layer) processing from the relay terminal device's protocol stack, retaining only layer 1 and layer 2 processing. This extraction eliminates the complex IP encapsulation/decapsulation operations while maintaining basic data transmission functionality through lower-layer protocols, directly reducing processing complexity and delay.
Solution Approach 2:
The patent segments the protocol stack into distinct layers, with the relay terminal device handling only layer 1 and layer 2 functions while layer 3 processing is performed by endpoint devices. This segmentation allows the relay device to focus on simple forwarding operations without the burden of complex IP layer processing.
2Reliability
If layer 3 (IP layer) encapsulation and decapsulation processing is performed sequentially through layers 1, 2, and 3, then complete data relay functionality is achieved, but processing delay increases
Solution Approach 1:
The patent removes layer 3 encapsulation and decapsulation operations from the relay processing path. The relay terminal device performs only layer 1 and layer 2 processing, extracting the time-consuming IP layer operations and leaving them to be handled by endpoint devices that have full protocol stacks.
Solution Approach 2:
The patent implements preliminary action by having endpoint devices perform layer 3 encapsulation before transmission and layer 3 decapsulation after reception. This shifts the time-consuming IP processing to occur before and after the relay operation, rather than during the relay process itself, reducing overall transmission delay.
3Reliability
If the relay terminal device performs sequential encapsulation and decapsulation through layers 1, 2, and 3, then complete protocol processing is achieved, but processing complexity increases
Solution Approach 1:
The patent extracts layer 3 processing requirements from the relay terminal device, configuring it with a truncated protocol stack that includes only layer 1 and layer 2. This extraction eliminates the need for complex IP encapsulation/decapsulation logic in the relay device while maintaining protocol processing completeness through endpoint device participation.
Solution Approach 2:
The patent segments protocol processing responsibilities across different devices: relay terminal devices handle layer 1 and layer 2 functions, while endpoint devices handle layer 3 functions. This segmentation distributes processing complexity appropriately, allowing relay devices to remain simple forwarding nodes while endpoint devices perform comprehensive protocol processing.
Data Source
AI summary
A method and device for relay transmission are provided. The method includes: a relay terminal device receives a PDU transmitted by a remote terminal device to a network device, where the adaptation layer PDU carries identity information of the remote terminal device, and the adaptation layer PDU is acquired by the remote terminal device by packaging, via a layer 2 adaptation layer, data carried in the adaptation layer PDU; the relay terminal device acquires in the layer 2 adaptation layer the identity information of the remote terminal device carried in the adaptation layer PDU; and the relay terminal device forwards, on the basis of the identity information of the remote terminal device acquired, the data carried in the adaptation layer PDU to the network device.