D2D MBMS Transmission Using Uplink Resources
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in providing efficient multimedia broadcast/multicast services due to limitations in device-to-device (D2D) communication, including coverage expansion and power consumption, especially in scenarios where user equipment (UE) is outside cellular coverage or in idle states.
Innovation Solution
A method and apparatus for providing multimedia broadcast/multicast services (MBMS) through device-to-device (D2D) communication using uplink resources, where control information is transmitted with an extended cyclic prefix, allowing D2D communication even in idle states, and enabling decoding and retransmission by base stations, thereby expanding coverage and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication is implemented for MBMS, then service availability is improved, but coverage expansion capability deteriorates
Solution Approach 1:
The patent introduces base stations as intermediary nodes that receive MBMS data from transmitting UEs and forward it to receiving UEs. This mediator approach enables D2D communication to extend beyond direct line-of-sight ranges, effectively expanding coverage area while maintaining service availability for UEs outside cellular coverage or in idle states
2Use of energy by moving object
If UEs communicate in idle states, then power consumption is reduced, but communication reliability deteriorates
Solution Approach 1:
The patent enables UEs in idle states to autonomously perform MBMS transmission and reception without requiring RRC connection establishment. The transmitting UE can directly send data to receiving UEs using pre-configured resources, allowing communication while maintaining idle state power savings, while the base station intermediary ensures reliable delivery
3Productivity
If uplink resources are used for MBMS, then resource utilization is improved, but interference levels worsen
Solution Approach 1:
The patent segments the wireless communication system into cellular mode and D2D mode, with distinct resource allocation mechanisms. By configuring specific uplink resources exclusively for D2D MBMS and separating them from conventional uplink resources, the system improves overall resource utilization while minimizing interference through spatial and spectral separation
Data Source
AI summary
The present invention relates to a method for providing, by a first UE, which conducts a device-to-device (D2D) communication, a multimedia broadcast/multicast service (MBMS) in a wireless communication system. In particular, the method comprises steps of: receiving, by a first UE, control information for a D2D communication; and providing, by the first UE, an MBMS to a second UE which is intended for the D2D communication, wherein the MBMS is configured to be transmitted using an uplink resource.