TDD Subframe Configuration for Device-to-Device Communication
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Solution Overview
Problem
In time division duplex (TDD) wireless communication systems, existing technologies face challenges in enabling device-to-device (D2D) communication as UEs require distinct uplink-downlink subframe configurations, which are not compatible with the standard configurations used for communication with base stations.
Innovation Solution
The method involves configuring at least two subframes for D2D communication between UEs, where one subframe is designated as uplink for one UE and downlink for the other, and vice versa, along with specific transmission and reception parameter settings to facilitate D2D data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs use the same uplink-downlink subframe configuration as in standard TDD communication with base stations, then system compatibility is maintained, but D2D communication between TDD UEs cannot be established because both UEs would transmit uplink simultaneously without dedicated downlink reception opportunities
Solution Approach 1:
The patent divides the TDD subframe configuration into separate uplink and downlink subframe sets for D2D communication. Each UE is assigned specific subframes for uplink transmission and different subframes for downlink reception, enabling full-duplex D2D communication while maintaining compatibility with standard TDD configurations for base station communication.
Solution Approach 2:
The patent applies different subframe configurations locally for D2D communication versus standard TDD communication. While the overall TDD configuration remains standard for compatibility, specific subframes are designated with unique uplink-downlink assignments tailored for D2D operations, allowing flexible resource allocation without disrupting the global system structure.
2Productivity
If separate uplink and downlink subframes are configured for D2D communication, then full-duplex communication is enabled, but the configuration becomes incompatible with standard TDD configurations used for base station communication
Solution Approach 1:
The patent implements dynamic subframe configuration where the network can flexibly assign uplink and downlink subframes for D2D communication based on traffic demands. The configuration can be adjusted through RRC signaling to match different D2D service requirements while maintaining the standard TDD configuration for base station communication, achieving both high productivity and adaptability.
3Reliability
If the network configures different uplink-downlink subframe assignments for communicating UEs, then D2D communication is enabled, but the number of configuration parameters and signaling overhead increases
Solution Approach 1:
The patent modifies specific TDD configuration parameters for D2D communication, particularly the uplink-downlink subframe assignment parameters. By changing these parameters locally for D2D while keeping the overall TDD framework standard, the patent enables reliable D2D communication with minimal impact on system-wide configuration complexity.
Data Source
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AI summary
A method of handling communication between time division duplex (TDD) devices for a network in a wireless communication system includes selecting at least two subframes to be used for a device to device (D2D) communication between a first user equipment (UE) and a second UE in the wireless communication system; indicating to the first UE to use a first subframe of the at least two subframes as an uplink subframe for the D2D communication and use a second subframe of the at least two subframes as a downlink subframe for the D2D communication; and indicating to the second UE to use the first subframe of the at least two subframes as a downlink subframe for the D2D communication and use the second subframe of the at least two subframes as an uplink subframe for the D2D communication.