Relay Cycle Coordination for D2D Cellular Latency
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Solution Overview
Problem
Current D2D communication systems face challenges in coordinating cellular and device-to-device (D2D) communication, leading to high latency and packet loss due to simultaneous cellular and D2D operation constraints, particularly in UE-to-network relay scenarios where resource collisions and limited TX/RX capabilities result in suspended D2D communication.
Innovation Solution
A method and system that configure a relay cycle with distinct time periods for D2D and cellular communication, allowing the relay UE to receive D2D data during one period and transmit it via cellular communication in another, enabling coordinated and low-latency UE-to-network relay functionality by broadcasting a relay cycle configuration and reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If simultaneous cellular and D2D communication operations are performed, then network coverage and service continuity are improved, but latency increases and packet loss occurs due to resource collisions
Solution Approach 1:
The patent segments the communication operations by introducing a relay cycle that divides time into distinct periods: D2D communication periods and cellular communication periods. This temporal segmentation prevents resource collisions between simultaneous operations while maintaining both service continuity and low latency by ensuring dedicated time slots for each communication type.
2Reliability
If simultaneous cellular and D2D communication operations are performed, then network coverage is improved, but packet loss occurs due to resource collisions
Solution Approach 1:
The relay cycle structure segments communication resources in the time domain, allocating specific periods for D2D communication and specific periods for cellular communication. This prevents resource collisions that cause packet loss while maintaining service continuity through coordinated switching between communication modes at defined cycle boundaries.
3Adaptability or versatility
If frequent RX retuning is performed to handle simultaneous cellular and D2D operations, then communication flexibility is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by establishing a relay cycle with fixed periods for D2D communication and cellular communication. The UE retunes its receiver periodically at cycle boundaries rather than frequently during operations, maintaining communication flexibility through structured periodic switching while significantly reducing power consumption compared to frequent ad-hoc retuning.
Data Source
AI summary
A system and method of data communication is provided for use in a wireless communication system. The wireless communication system includes a base station, a relay user equipment (UE) and an out of coverage UE (OOC-UE). The method includes receiving, at the relay UE and from the base station, a relay cycle configuration, the relay cycle configuration defining a relay cycle including a first time period for device to device (D2D) communication, and a second time period for cellular communication. The method then includes receiving, at the relay UE by D2D communication, within the first time period and from the out of coverage UE (OOC-UE), relay data, and providing, from the relay UE by cellular communication, within the second time period and to the BS, the relay data.