Multiuser Superposition Transmission for Wireless Coverage
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing downlink data transmission to user equipment (UE) due to limitations in resource allocation and interference management, particularly in scenarios with varying numbers of active UEs, affecting coverage and performance.
Innovation Solution
A method involving joint transmission (JT) from multiple cells using multiuser superposition transmission (MUST), where eNodeBs receive and configure channel state information (CSI) to optimize power allocation and precoding matrices for UE pairs, enabling constructive signal formation and improved reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiuser superposition transmission (MUST) is applied to improve coverage for near UEs when active UEs are few, then coverage is improved, but interference management complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting power allocation factors and precoding matrices based on the number of active UEs and channel conditions. When active UEs are few, the system changes transmission parameters to favor near UE coverage through optimized power distribution and precoding, thereby improving coverage while managing interference through parameter optimization rather than complex control mechanisms
Solution Approach 2:
The system implements dynamics by adapting MUST application decisions, power allocation, and precoding configurations in real-time based on the number of active UEs and channel state information. This dynamic adaptation allows the system to switch between MUST and non-MUST transmission modes, adjusting coverage and interference management strategies according to current network conditions without requiring complex static configurations
2Reliability
If joint transmission from multiple cells is implemented to improve downlink reception for far UEs, then reception performance is improved, but system complexity and resource coordination overhead increase
Solution Approach 1:
The patent applies merging by combining transmissions from multiple eNodeBs (first eNodeB and second eNodeB) to serve the same far UE simultaneously. This joint transmission merges resources and signals from multiple cells to improve downlink reception performance for far UEs, achieving reliability enhancement through coordinated multiplication of transmission points rather than through complex individual link optimizations
Solution Approach 2:
The system changes transmission parameters including power allocation factors and precoding matrices specifically configured for joint transmission scenarios. These parameter changes enable coordinated multi-point transmission by optimizing the combined signal from multiple eNodeBs, improving far UE reception while managing system complexity through parameter-based coordination rather than complex control protocols
3Reliability
If power allocation and precoding are dynamically adjusted to manage interference in MUST, then interference management performance is improved, but computational complexity and signaling overhead increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting power allocation factors and precoding matrices based on channel state information and the number of active UEs. This approach improves interference management performance by optimizing transmission parameters in real-time, achieving reliable interference control through parameter adaptation rather than through computationally intensive signal processing or complex coordination protocols
Solution Approach 2:
The system implements feedback mechanisms where channel state information from UEs is used to determine appropriate power allocation and precoding configurations. This feedback-driven approach improves interference management by using actual channel conditions to guide parameter selection, reducing computational complexity compared to open-loop optimization while maintaining reliable interference control through adaptive parameter adjustment
Data Source
AI summary
A method for multiuser superposition transmission (MUST) in a wireless communication system, and a device therefor are disclosed. Particularly, a method by which a first base station (eNodeB (eNB)) performs MUST involving joint transmission in a wireless communication system can comprise the steps of: receiving, from a MUST-paired near user equipment (UE), first channel state information (CSI) for the first eNB participating in the joint transmission; setting a parameter required to perform the MUST involving the joint transmission for the MUST-paired UE, on the basis of the first CSI and the second CSI for a second eNB participating in the joint transmission; and transmitting the parameter to the MUST-paired UE and the second eNB.