D2D Uplink Physical Channel Resource Mapping
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Solution Overview
Problem
The increasing bandwidth requirements and heavy loads on wireless communication networks due to high-data-rate services, such as high-definition video, necessitate improved spectral efficiency and data transmission rates, which existing LTE-A systems struggle to meet, particularly in device-to-device (D2D) communication scenarios.
Innovation Solution
The method involves configuring a D2D uplink physical channel using a physical resource block with orthogonal frequency division multiplexing (OFDM) symbols and subcarriers, where control information like MCS, RV, NDI, CQI, and PMI are mapped onto high-frequency resource elements, and data information is mapped onto blank elements, optimizing signal distribution to enhance spectral efficiency and data transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If LTE-A system uses Carrier Aggregation and MIMO enhancement technology to improve data rate, then peak data rate increases to 1 Gbits/s, but network load becomes heavier and bandwidth requirements increase
Solution Approach 1:
The patent extracts the communication function from the base station and enables direct device-to-device communication. User equipment can communicate directly with each other without base station forwarding, thereby extracting the data transmission burden from the base station and reducing network load while maintaining high data rates
2Productivity
If D2D communication shares spectral resources with existing mobile communication network, then spectral efficiency improves, but interference to existing network terminals may occur
Solution Approach 1:
The patent applies local quality by assigning different spectral resources to different communication scenarios. D2D communication uses uplink spectral resources while existing downlink communications use downlink spectral resources, creating localized resource allocation that improves spectral efficiency while preventing interference between different communication types
3Productivity
If D2D communication uses uplink spectral resources for time division multiplexing, then spectral resource utilization improves, but simultaneously receiving and sending is not supported
Solution Approach 1:
The patent segments the communication function into separate transmit and receive operations that occur at different time intervals. By dividing the communication process into discrete time slots where devices alternate between transmitting and receiving, the system achieves efficient spectral resource utilization through time division multiplexing while managing the limitation of not supporting simultaneous full-duplex operations
Data Source
AI summary
The present invention discloses a method for D2D communication. The method includes carrying control information and data information, to be sent, in a physical resource block, wherein the physical resource block comprises M OFDM symbols in the time domain and N subcarriers in the frequency domain. The control information comprises at least one of MCS, RV, and NDI, at least one of the MCS, the RV, and the NDI being mapped onto an RE in a high frequency part of the physical resource block. The data information is mapped onto a blank RE in the physical resource block excluding the RE onto which the control information is mapped. The method also includes sending the physical resource block to a target user equipment on a D2D communication link. Spectral efficiency and data transmission rate can be improved by reasonably configuring an uplink physical channel of D2D communication.