D2D Resource Allocation With Network-Mediated Bearer Setup
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing device-to-device (D2D) communication by efficiently establishing direct data paths and service discovery, particularly in scenarios where devices are in proximity, requiring enhanced architectures and procedures for call establishment and maintenance, especially in inter-operator environments.
Innovation Solution
A method and apparatus are developed to optimize proximity data path setup by enabling direct WTRU-to-WTRU communication through various bearer configurations, including end-to-end and indirect paths via network nodes, with mechanisms for device discovery, call establishment, and policy management, supported by a D2D server and MME interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If direct D2D communication paths are established between devices, then communication efficiency and speed are improved, but network complexity and resource allocation difficulty increase
Solution Approach 1:
The patent introduces network nodes (eNB, MME) as intermediaries to manage and coordinate D2D communication paths. These intermediaries handle bearer setup, resource allocation, and path optimization, reducing the complexity burden from end devices while maintaining direct communication benefits. The network infrastructure mediates between direct device-to-device links and core network connectivity.
Solution Approach 2:
The patent segments the communication path into multiple bearers (default bearer, dedicated bearer, D2D-specific bearer) with distinct functions and QoS parameters. This segmentation allows independent optimization of each path type, enabling direct D2D communication for speed while managing complexity through structured, modular bearer management at different network layers.
2Adaptability or versatility
If multiple bearer configurations are supported for D2D communication, then service versatility and adaptability are improved, but system complexity and configuration overhead increase
Solution Approach 1:
The patent creates a universal bearer framework where a single D2D bearer type can serve multiple service types (unicast, multicast, broadcast) and multiple QoS requirements. The default bearer provides universal connectivity, while dedicated bearers can be configured for specific services, reducing the need for entirely separate communication paths for each service type.
Solution Approach 2:
The patent applies local quality by configuring different QoS parameters and bearer characteristics specific to each service requirement and local network condition. Each bearer can be optimized locally for its specific function (e.g., low latency for voice, high throughput for data) without affecting the overall system structure, allowing versatility through localized optimization.
3Productivity
If D2D communication paths are established without network intermediation, then resource allocation efficiency is improved, but reliability and quality of service control deteriorate
Solution Approach 1:
The patent applies partial intermediation where the network provides selective control rather than full management. The network establishes and configures bearers initially (partial action) to ensure QoS and reliability, but then allows direct device-to-device communication to proceed with minimal network involvement, achieving resource allocation efficiency while maintaining necessary quality control.
Solution Approach 2:
The patent performs preliminary network-mediated actions (bearer setup, resource reservation, QoS configuration) before direct D2D communication begins. This preliminary intervention ensures reliability and QoS control are established in advance, allowing subsequent direct communication to achieve high resource efficiency without compromising service quality.
4Object-affected harmful factors
If discovery and communication frequencies are separated, then interference management is improved, but measurement accuracy and link quality assessment deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where devices measure link quality on the discovery frequency and translate these measurements to predict performance on the communication frequency. The network receives these translated quality assessments and uses them to make informed decisions about bearer configuration and resource allocation, compensating for the frequency separation through intelligent feedback processing.
Solution Approach 2:
The patent creates a copied or translated representation of link quality from the discovery frequency to the communication frequency. Instead of directly measuring communication frequency quality (which would cause interference), the system copies quality assessment information from the discovery frequency measurements, maintaining measurement precision without direct interference on the communication channel.
Data Source
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AI summary
A method and apparatus are described for receiving, by a wireless transmit/receive unit (WTRU) from a network in a radio resource control (RRC) message, resource allocation information, for a plurality of WTRUs, including frequency information for device to device (D2D) communication, wherein the resource allocation information for D2D communication is different than WTRU to network device communication; selecting, by the WTRU from the received resource allocation information, a subset of resources for a D2D channel; and transmitting, by the WTRU using the selected subset of resources, data directly to another WTRU.