D2D Resource Allocation for Interference Mitigation in LTE
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face inefficiencies in providing real-time information due to complexity and time delays, and struggle to minimize interference during device-to-device (D2D) communication between user equipment (UEs) in LTE systems, which affects the quality of service and system performance.
Innovation Solution
A method and apparatus for allocating resources in a wireless communication system that distinguishes between cellular and D2D UEs, alternately allocating resources to prevent interference by including a transmission period for D2D uplink symbols with control information, allowing efficient communication and scheduling by the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resources are shared between cellular UE and D2D UE in LTE systems, then system capacity and coverage are improved, but symbol interference occurs between cellular communication and D2D communication
Solution Approach 1:
The patent segments the uplink resources by introducing separate PUCCH resources for D2D UEs distinct from cellular UEs. D2D UEs are assigned specific PUCCH resource blocks that do not overlap with cellular UE resources, thereby dividing the resource space to eliminate interference while maintaining overall system capacity.
Solution Approach 2:
The patent applies local quality by configuring D2D UEs with specific PUCCH resource parameters (frequency offset, resource block index, cyclic shift) that are locally optimized for D2D communication. This localized resource configuration ensures that D2D control information is transmitted on resources tailored to D2D requirements, preventing interference with cellular uplink control channels.
2Loss of time
If D2D communication is introduced without passing through base station, then real-time information sharing between UEs is enabled, but interference with cellular communication resources occurs
Solution Approach 1:
The patent segments control channel resources by creating dedicated PUCCH resources for D2D UEs that are separate from cellular UE resources. This segmentation allows D2D control information to be transmitted independently without interfering with cellular control channels, enabling direct UE-to-UE communication while protecting cellular resources from interference.
Solution Approach 2:
The base station acts as an intermediary by configuring and managing separate PUCCH resources for D2D UEs. Although D2D data communication occurs directly between UEs, the base station mediates the resource allocation and control information transmission, ensuring that D2D control signals use dedicated resources that do not conflict with cellular communication resources.
3Productivity
If same resources are allocated for cellular UE and D2D UE, then resource utilization efficiency is improved, but quality of service deteriorates due to interference
Solution Approach 1:
The patent segments the uplink control channel resources by allocating separate PUCCH resources for D2D UEs. This segmentation maintains high resource utilization by keeping D2D control channels within the LTE framework while preventing interference through spatial and frequency separation of control resources, thereby preserving service quality.
Solution Approach 2:
The patent applies local quality by configuring D2D UEs with specific PUCCH resource parameters optimized for their communication needs. Each D2D UE receives locally tailored resource assignments (frequency offsets, resource block indices, cyclic shifts) that ensure reliable control information transmission without interfering with cellular UEs, maintaining both efficiency and service quality.
Data Source
AI summary
Provided are an apparatus and a method for allocating resources in a wireless communication system. In particular, the present invention includes the feature of alternately allocating resources for D2D communication and resources for cellular communication, or allocating resources of a D2D link to not be adjacent to each other. In addition, the present invention prevents interference with the cellular communication and interference with other D2D links by allocating a partial area of the resources allocated for the D2D communication to an area for transmitting a D2D uplink symbol to an eNB, or by adding a GP symbol to a partial area of the resources for the D2D communication. Furthermore, in the case of applying a TDD scheme, the present invention prevents interference with symbols for performing the cellular communication by defining a partial section of a special subframe as a section for transmitting the D2D uplink symbol, or by reflecting a time delay of N OFDM symbol durations. Accordingly, the present invention prevents the D2D communication from causing interference.