D2D Base Pattern Selection for Network-Independent LTE Communication
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Solution Overview
Problem
Current LTE communication systems are limited by requiring network coverage, which hampers public safety applications such as police, firefighters, and paramedics who need communication tools that function independently of network availability.
Innovation Solution
Implementing a method for device-to-device (D2D) communication in LTE systems, where a wireless transmit/receive unit (WTRU) determines and selects a base pattern for D2D communication independently of a network, with pre-defined durations and transmission opportunities, allowing for efficient data packet transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE communication requires network coverage, then communication reliability is improved, but adaptability to public safety scenarios is worsened
Solution Approach 1:
The patent segments the communication system into two operational modes: network-dependent mode for normal operation and network-independent D2D mode for public safety scenarios. This segmentation allows the system to maintain high reliability through network coverage while adapting to scenarios where network coverage is unavailable, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The patent implements dynamic mode switching capability that allows the communication system to transition between network-dependent and network-independent operations based on availability. This dynamic adaptation enables the system to maintain reliability when network is available while becoming adaptable when network coverage is lost, particularly for public safety applications.
2Adaptability or versatility
If D2D communication operates independently of network, then adaptability to public safety scenarios is improved, but resource allocation efficiency is worsened
Solution Approach 1:
The patent applies preliminary action by pre-configuring base patterns with predefined transmission opportunities, durations, and resource allocations before D2D communication begins. These base patterns include predetermined parameters such as transmission timing, resource blocks, and power levels, allowing devices to independently manage resources without network intervention while maintaining efficient allocation through advance planning.
3Productivity
If base patterns have pre-defined duration with transmission opportunities, then resource allocation is optimized, but flexibility in transmission timing is worsened
Solution Approach 1:
The patent implements dynamics by allowing the selection of different base patterns with varying durations and transmission opportunity structures. While each individual base pattern has predefined characteristics for efficient resource allocation, the system can dynamically select among multiple base patterns with different timing characteristics, thereby maintaining flexibility in transmission timing while preserving resource allocation efficiency through structured patterns.
Data Source
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AI summary
Embodiments include methods and apparatuses for the design, construction and selection of base patterns and associated control signaling for direct device-to-device (D2D) communication, independent of a network. An embodiment includes the selection and transmission, by a wireless transmit and receive unit (WTRU), of base patterns in a scheduling period when the number of medium access control (MAC) protocol data units (PDUs) is larger than the number of MAC PDUs that a family of pre-determined base patterns can support. An embodiment may include the selection and transmission, by a WTRU, of base patterns in a scheduling period when the number of MAC PDUs is smaller than the number of MAC PDUs that a family of pre-determined base patterns can support. In addition, embodiments may include the selection, by a WTRU, of a base pattern or base patterns to minimize interference with other communications and to use resources efficiently.