D2D Relay Grouping for Wireless Broadcast Efficiency
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Solution Overview
Problem
In wireless communication systems, existing methods for information relaying are inefficient due to reliance on channel states of base stations and users, leading to prolonged transmission times and energy consumption, especially when channel environments are poor, which can result in failed information relay.
Innovation Solution
A method is proposed that divides terminals into groups based on channel states to enable efficient D2D communication, where users with good channel conditions relay information to those with poor conditions using D2D communication, employing techniques like V-MIMO and DSTC, and minimizing feedback through threshold-based user division.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base station relays information to all users using traditional broadcasting, then all users can receive information, but transmission time and energy consumption increase especially when channel conditions are poor
Solution Approach 1:
The patent segments users into two groups based on channel conditions: a first group with good channel conditions and a second group with poor channel conditions. This segmentation allows the base station to broadcast information efficiently to the first group while the second group receives information through D2D communication from the first group, thereby reducing overall transmission time while maintaining reliability for all users.
2Reliability
If base station uses traditional broadcasting to transmit information, then information can be delivered to all users, but energy consumption increases due to prolonged transmission
Solution Approach 1:
By dividing users into two groups based on channel conditions, the patent enables the base station to transmit information only to the first group (good channel conditions) using traditional broadcasting, while the second group (poor channel conditions) receives information through D2D communication. This segmentation significantly reduces the base station's transmission time and energy consumption while ensuring all users receive the information reliably.
3Reliability
If users wait for base station to relay information to all users sequentially, then information can be delivered to everyone, but transmission time is prolonged
Solution Approach 1:
The patent applies preliminary action by having the base station first broadcast information to the first group of users (with good channel conditions) before the second group needs the information. This preliminary transmission to the first group enables them to subsequently relay the information to the second group through D2D communication, thereby reducing the overall time required for complete information delivery and improving relay efficiency.
4Ease of operation
If traditional broadcasting is used without D2D communication, then base station controls information transmission, but users with poor channel conditions cannot receive information efficiently
Solution Approach 1:
The patent introduces D2D communication as an intermediary mechanism between the base station and users with poor channel conditions. The first group of users (with good channel conditions) acts as intermediaries who receive information from the base station and relay it to the second group through D2D communication. This intermediary approach maintains base station control for initial information distribution while ensuring reliable delivery to users with poor channel conditions through the cooperative D2D relay mechanism.
Data Source
AI summary
Disclosed is a method in which a base station (BS) transmits information to a plurality of terminals in a wireless communication system. Specifically, the method comprises the steps of: dividing the plurality of terminals into two or more groups according to a channel state of each of the BS and the plurality of terminals and a channel state between the plurality of terminals; and broadcasting the information to a first group among the two or more groups, wherein the first group transmits the information to another group among the two or more groups through D2D communication.