D2D Signal Reception via Quasi-Co-Location in Wireless Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently transmitting and receiving signals between User Equipment (UE) and eNode B (eNB) using direct communication schemes, particularly in terms of cost reduction, service availability, flexible frequency band use, and power consumption, while maintaining competitive performance.
Innovation Solution
A method for UE to receive and transmit signals using Device-to-Device (D2D) communication by comparing large-scale properties of D2D signals with downlink signals, allowing for signal transmission and reception through uplink resources, and utilizing quasi-co-location assumptions to enhance channel estimation and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication is implemented using uplink resources, then service availability and flexible frequency band use are improved, but device complexity and power consumption increase
Solution Approach 1:
The patent enables user equipment to perform both traditional downlink reception and D2D communication functions using the same radio frequency components and baseband processing capabilities. The UE can simultaneously or alternatively use uplink resources for D2D transmission, making the device multi-functional without requiring separate dedicated hardware paths for D2D operations.
Solution Approach 2:
The patent implements dynamic resource allocation where the UE can flexibly switch between using downlink resources for traditional communication and uplink resources for D2D communication based on network conditions and service requirements. The resource selection and configuration are dynamically adjusted through RRC signaling and scheduling decisions, allowing the system to adapt to varying service availability needs.
2Adaptability or versatility
If D2D communication uses uplink resources, then flexible frequency band use is improved, but power consumption increases
Solution Approach 1:
The patent changes the operational parameters of the UE by configuring it to transmit and receive D2D signals on uplink frequency resources instead of dedicated D2D resources. This parameter change enables flexible frequency band utilization as uplink bands can be dynamically selected. The power consumption impact is managed through efficient resource allocation and scheduling by the eNodeB, which optimizes transmission power and resource assignment.
3Measurement precision
If quasi-co-location assumptions are used for channel estimation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies quasi-co-location assumptions by copying channel estimation parameters and large-scale properties from the downlink signal to the D2D signal. Instead of independently estimating channel characteristics for D2D communication, the UE reuses synchronization and channel state information obtained from downlink synchronization signals and reference signals, thereby improving measurement precision while avoiding the complexity of separate channel estimation procedures.
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
Disclosed in the present specification is a method by which a terminal receives a signal by using device-to-device (D2D) communication in a wireless communication system. Particularly, the method comprises the steps of: receiving, through an upper layer, information related to whether the large scale properties of a D2D communication signal and a downlink signal from a base station are the same; and receiving the D2D communication signal from the base station through an uplink resource on the basis of the information related to whether the large scale properties are the same.