Inter-Carrier D2D Discovery Resource Allocation
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Solution Overview
Problem
In inter-carrier D2D communication, UEs face challenges when transitioning to a connected state for resource requests on a secondary carrier without assistance from the serving cell, leading to unnecessary signaling, and when simultaneous transmission on multiple carriers is required, causing power consumption and alignment issues with uplink and discovery transmission timings.
Innovation Solution
A method for a UE served by a primary cell on a first carrier to receive signaling for discovering resource configurations on a second carrier, determine TX gaps on the first carrier for discovery transmission on the second carrier, and transmit a TX gap request to the base station, allowing for efficient resource allocation and alignment of transmission timings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE transitions to a connected state to request resources for discovery transmission on a secondary carrier, then the UE can obtain dedicated resources, but unnecessary signaling overhead and power consumption increase
Solution Approach 1:
The UE autonomously selects discovery resources from pre-configured resource pools on the secondary carrier without needing to transition to connected state or request resources through signaling. This self-service approach eliminates unnecessary signaling overhead and reduces power consumption while ensuring reliable resource allocation through pre-configured resource pools
Solution Approach 2:
Resource pools for discovery transmission are pre-configured on secondary carriers during initial network setup or idle state. This preliminary action allows the UE to directly utilize these resources without transitioning to connected state, thereby avoiding unnecessary signaling and reducing power consumption while maintaining reliable resource allocation
2Productivity
If a UE performs simultaneous uplink transmission and discovery transmission on multiple carriers, then communication efficiency improves, but transmission timing alignment becomes difficult and power consumption increases
Solution Approach 1:
The system segments discovery transmission resources into specific time slots or subframes on secondary carriers that are separate from uplink transmission resources on the primary carrier. This segmentation allows the UE to perform uplink and discovery transmissions simultaneously without timing alignment complexity, as each transmission type operates in its designated resource segment
Solution Approach 2:
The system introduces a frequency dimension by allowing discovery transmission on secondary carriers while uplink transmission occurs on the primary carrier. This dimensional separation in the frequency domain enables simultaneous transmissions without requiring precise timing alignment in the time domain, thereby improving communication efficiency while reducing device complexity
Data Source
AI summary
A system and method for use in a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE) is disclosed. The method for performing a discovery transmission on a second carrier by a user equipment (UE) served by a primary cell (PCell) on a first carrier, includes receiving, from a base station, a signaling indicating that the UE read discovery resource configuration for the second carrier on the second carrier or that the UE should request the discovery resource configuration for the second carrier from the base station for acquiring the discovery resource configuration for the second carrier. The method also includes acquiring the discovery resource configuration based on the signaling.