Layer-1 Destination Address Pre-configuration for D2D Latency Reduction
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Solution Overview
Problem
Current device-to-device (D2D) communication systems in LTE networks rely on the core network for address management, which can lead to increased latency and resource utilization, as they do not utilize Layer-1 destination addresses for direct communication between User Equipments (UEs).
Innovation Solution
A controller in the network derives and pre-configures Layer-1 destination addresses for D2D communications between UEs, allowing them to transmit data directly using cellular or WLAN resources without routing through the core network, by identifying application codes, UE identities, or communication modes to facilitate direct communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs use core network routing for D2D communication, then address management is centralized, but latency increases and core network resources are overutilized
Solution Approach 1:
The patent segments address management into two parts: Layer-1 destination addresses are pre-configured locally at UEs for direct communication, while Layer-3 addresses remain managed by the core network for routing and control purposes. This segmentation allows D2D traffic to bypass core network routing, reducing latency while maintaining centralized management for non-real-time functions.
Solution Approach 2:
The controller pre-configures Layer-1 destination addresses at UEs before actual D2D communication occurs. This preliminary action stores address information locally at the UE, enabling immediate direct transmission without real-time core network involvement during data transfer, thus reducing communication latency.
2Device complexity
If UEs route all traffic through the core network, then address management is simplified, but resource utilization increases and power efficiency decreases
Solution Approach 1:
The patent divides communication protocols into multiple layers with different address management approaches. Layer-1 uses pre-configured destination addresses for direct transmission, while higher layers use traditional network addresses. This segmentation reduces the need for complex real-time address resolution and core network routing, lowering UE power consumption.
Solution Approach 2:
UEs self-configure Layer-1 destination addresses locally without continuous core network involvement. The controller provides initial address configuration, but UEs autonomously use these addresses for direct communication, reducing repeated signaling and core network resource utilization, thereby improving power efficiency.
3Adaptability or versatility
If traditional addressing (directory numbers, MAC addresses) is used for D2D communication, then higher layer protocols are maintained, but direct Layer-1 transmission is not enabled
Solution Approach 1:
The patent separates addressing functions by protocol layer: Layer-1 uses dedicated destination addresses for direct radio transmission, while Layer-3 maintains traditional IP addressing for end-to-end communication. This segmentation enables efficient direct Layer-1 transmission while preserving protocol compatibility at higher layers.
Solution Approach 2:
The patent introduces Layer-1 destination addresses as an intermediary addressing mechanism between the physical layer and network layer. This intermediary layer enables direct radio transmission without requiring traditional network addressing at Layer-1, bridging the gap between direct communication needs and protocol compatibility requirements.
Data Source
AI summary
Systems and methods that configured a Layer-1 destination address for D2D communications. One embodiment is a controller in a network that receives a discovery request from first User Equipment (UE), identifies an application code to announce the first UE during a discovery procedure, and provides the application code to the first UE. The controller receives an address request from the first UE for a D2D communication with one or more second UEs identified during the discovery procedure. The controller derives a Layer-1 destination address for the D2D communication, and provides the Layer-1 destination address to the first UE and to the at least one second UE for pre-configuration of the Layer-1 destination address at the first UE and the at least one second UE before the D2D communication.