D2D UE Data Transmission Using TRP Bitmaps

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In Device-to-Device (D2D) communication systems, existing methods fail to effectively minimize interference and collision between User Equipments (UEs) during data transmission, leading to inefficiencies in resource allocation and network overhead.

Innovation Solution

A method and apparatus for D2D data transmission in a wireless communication system, where a bitmap is determined using a Time Resource Pattern (TRP) to identify suitable subframes for data transmission, with the Radio Resource Control (RRC) information element restricting the usable bitmaps to minimize interference, allowing UEs to transmit data in specific subframes indicated by the bitmap.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If D2D communication is introduced to reduce network overhead, then network overhead is reduced, but interference and collision between UEs increases

Engineering Contradiction:

Improvenetwork overheadVSAvoidinterference and collision between UEs

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The resource pool is segmented into multiple subsets, each associated with different TRP values. UEs are assigned to specific subsets based on their TRP, which divides the transmission space and reduces interference between different UE groups. This segmentation allows simultaneous D2D communications to occur in different resource subsets without causing mutual interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The network performs preliminary configuration of TRP values and resource pool subsets before D2D data transmission begins. The eNodeB assigns specific TRP values to UEs and pre-configures which resource pool subsets each UE should use, preventing interference and collision before they occur by establishing a structured resource allocation framework in advance.

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If resource allocation is optimized to minimize interference, then interference and collision are reduced, but device complexity increases

Engineering Contradiction:

Improveinterference and collision between UEsVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

UEs autonomously determine their own resource allocations based on pre-configured TRP values and resource pool subset mappings. Each UE independently selects appropriate resources from its assigned subset without requiring complex real-time coordination with other UEs, reducing device complexity while maintaining interference minimization through the self-organizing nature of the TRP-based allocation scheme.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11039436B2Method and device by which device-to-device user equipment transmits data in wireless communication system

Publication Date: 2021.06.15 LG ELECTRONICS INC

AI summary

A method by which a user equipment (UE) transmits device-to-device (D2D) data in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: determining a bitmap to be applied to a subframe pool for data transmission by using information indicating a time resource pattern (TRP); and transmitting D2D data in a subframe indicated by the bitmap, wherein a set of bitmaps indicatable by the information indicating the TRP when a radio resource control (RRC) information element related to a TRP subset is configured in the UE is a subset of a bitmap set indicatable by the information indicating the TRP when the UE is not concerned in the RRC information element related to the TRP subset.