D2D Resource Pool Configuration for Latency and Power Trade-offs
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving device-to-device (D2D) control information and data, particularly in managing resource allocation and power control for D2D communication, which affects latency and power consumption.
Innovation Solution
A method for transmitting and receiving D2D control information and data through Radio Resource Control (RRC) signaling, utilizing pre-configured resource pools and scheduling assignments, with the ability to update resource allocation and operate in D2D reception or discontinuous transmission modes to optimize resource use and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring of D2D resources is performed, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous transmission modes where D2D resources are monitored periodically rather than continuously. The UE can be configured to monitor D2D resources at specific intervals or during specific time windows, reducing power consumption while maintaining detection reliability through strategic periodic sampling of the D2D resource pool.
Solution Approach 2:
The patent establishes D2D resource pools and monitoring configurations in advance through higher layer signaling (RRC configuration). The network pre-configures the UE with D2D resource pool information, monitoring occasions, and transmission parameters before actual D2D communication occurs, allowing the UE to prepare efficient monitoring schedules that balance detection reliability with power savings.
2Loss of time
If D2D control information is transmitted frequently, then latency is reduced, but signaling overhead increases
Solution Approach 1:
The patent combines D2D control information transmission with existing cellular uplink resources. D2D control information is multiplexed with uplink data transmissions or transmitted during scheduled uplink slots, thereby reducing additional signaling overhead while maintaining low latency through efficient resource utilization of already allocated uplink channels.
Solution Approach 2:
The patent implements dynamic D2D resource allocation where the timing and frequency of D2D control information transmission adapt based on traffic conditions, channel state, and QoS requirements. The network can dynamically adjust the periodicity and resource allocation for D2D control signaling, optimizing the balance between latency reduction and overhead minimization according to real-time system conditions.
3Adaptability or versatility
If resource allocation flexibility is increased, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments D2D resource pools into multiple logical groups with different configurations (e.g., different periodicities, frequencies, time resources). Each segment can be independently configured and activated based on specific service requirements. This segmentation allows the network to provide flexible resource allocation for different D2D applications while keeping the UE implementation complexity manageable through structured, modular resource organization.
Solution Approach 2:
The patent introduces higher layer signaling (RRC configuration) as an intermediary that manages complex D2D resource allocation parameters. The network uses RRC signaling to convey detailed resource pool configurations, monitoring occasions, and transmission parameters to the UE, thereby offloading the complexity of flexible resource management from the physical layer processing to the higher layer protocol stack, which handles complex configurations more efficiently.
Data Source
AI summary
The present disclosure relates to a method for transmitting and receiving data performed by a first user equipment (UE) in a wireless communication system that supports a device-to-device (D2D) communication includes receiving control information related to the D2D communication through Radio Resource Control (RRC) signaling from a base station (eNB); receiving resource allocation (RA) information related to a Scheduling Assignment (SA) transmission through a D2D grant from the eNB; transmitting the SA to a second UE based on the received resource allocation information; and transmitting a D2D data to the second UE, wherein the control information includes at least one of an SA resource pool or a D2D data resource pool, and wherein the SA resource pool and the D2D data resource pool are pre-configured by a high layer.