D2D Resource Signaling for Dynamic LTE-TDD Reconfiguration
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Solution Overview
Problem
Current LTE-TDD systems face challenges in dynamically adapting to device-to-device (D2D) transmissions, leading to interference issues when switching between uplink and downlink configurations, which affects network efficiency and user experience.
Innovation Solution
Implementing a method to dynamically signal changes in LTE-TDD configurations by broadcasting configuration update messages that indicate new subframe allocations for D2D transmissions, allowing UEs to adjust their operations and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE-TDD dynamically reconfigures uplink-downlink subframe allocations to adapt to traffic patterns, then network efficiency and spectral utilization are improved, but interference occurs between D2D transmissions and cellular traffic due to mismatched resource allocations
Solution Approach 1:
The base station pre-configures D2D resources in semi-persistent manner before dynamic TDD reconfigurations occur. When uplink-downlink subframe allocations change, the pre-configured D2D resources are automatically adjusted to match the new cellular traffic pattern, preventing interference before it occurs. This is achieved through RRC signaling that updates D2D resource configurations based on current TDD configuration.
Solution Approach 2:
The system implements feedback mechanisms where the base station monitors both cellular traffic patterns and D2D transmission quality. Based on this feedback, the base station dynamically adjusts D2D resource allocations to maintain optimal performance. The feedback loop ensures that D2D resources are reallocated when interference is detected or when traffic patterns change, resolving the contradiction between network efficiency and interference reduction.
2Reliability
If D2D resources are semi-persistently allocated to ensure stable D2D transmissions, then D2D communication reliability is improved, but flexibility to adapt to dynamic TDD reconfigurations is reduced
Solution Approach 1:
The patent implements dynamic D2D resource allocation where semi-persistent resources are initially assigned for stability, but these resources can be dynamically updated through RRC signaling when TDD reconfigurations occur. The system transitions from static semi-persistent allocation to a hybrid approach that maintains reliability through persistent allocation while enabling adaptability through dynamic update mechanisms. This resolves the contradiction by making the allocation scheme itself dynamic rather than purely static or purely dynamic.
Data Source
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AI summary
A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be a UE. The apparatus receives a D2D resource message based on a change in an uplink-downlink subframe configuration of at least one frame. The D2D resource message enables the apparatus to determine D2D resources allocated for D2D transmissions after the change in the uplink-downlink subframe configuration. The apparatus determines a subset of the D2D resources to be used for performing D2D transmissions based on the received D2D resource message.