Superposition Modulated Wireless Data Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in increasing system capacity, particularly in scenarios like homogeneous and heterogeneous network deployments, due to interference issues when implementing Multi User Superposition Transmission (MUST) techniques.
Innovation Solution
The method involves selecting UEs based on channel state information (CSI) to transmit a superposition modulated stream of data, where precoded symbols for extended UEs are superimposed on those for based UEs, using advanced base stations to manage transmit power and CSI reporting configurations, enabling flexible UE pairing and interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Multi User Superposition Transmission (MUST) techniques are implemented to increase system capacity, then spectrum efficiency and bit rate per channel are improved, but interference issues arise in homogeneous and heterogeneous network deployments
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the superposition factor (beta) based on channel state information, SINR conditions, and network deployment type. This allows the system to optimize the balance between capacity improvement and interference management by modifying transmission parameters adaptively rather than using fixed superposition coding schemes
Solution Approach 2:
The patent implements dynamics through adaptive MUST configuration where the base station dynamically selects between MUST and non-MUST transmission modes, adjusts superposition factors in real-time based on CSI feedback, and modifies resource allocation patterns. This dynamic adaptation enables the system to respond to changing interference conditions and maintain optimal performance across different network scenarios
2Productivity
If advanced receiver design with interference cancellation is used to achieve higher transmission rates, then spectrum efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies partial action by implementing selective MUST configuration where not all users or all resource blocks use superposition transmission. The base station selectively enables MUST only for user pairs and resource allocations where the channel conditions and interference patterns are suitable, thereby achieving capacity improvements without requiring full-blown advanced interference cancellation in all receiver paths
Solution Approach 2:
The patent uses parameter changes to control the complexity of receiver design by adjusting the superposition factor beta and selecting between different MUST modes (e.g., power-domain vs. space-domain). These parameter adjustments allow the system to simplify receiver processing when interference conditions are manageable while still providing advanced interference cancellation capabilities when needed for higher transmission rates
3Productivity
If superposition coding is used to allow multiple users to share the same resources without spatial separation, then capacity is improved, but measurement precision and interference management become more difficult
Solution Approach 1:
The patent implements feedback mechanisms where user equipment reports channel state information (CSI) including SINR measurements and interference levels back to the base station. This feedback loop enables the base station to accurately assess channel conditions, select appropriate MUST configurations, and adjust superposition factors to maintain measurement precision despite the presence of superimposed signals from multiple users
Solution Approach 2:
The patent applies preliminary action by having the base station perform user pairing and MUST configuration decisions based on predicted channel conditions and historical CSI data before actual transmission begins. This preliminary configuration allows the system to pre-compute optimal superposition factors and select user pairs that minimize interference, thereby maintaining measurement precision without requiring real-time complex measurements during active superposition transmission
Data Source
AI summary
An advanced wireless communication system and method of use thereon is disclosed. The method comprises: selecting, according to first CSI provided by the plurality of UEs, one or more based UEs and one or more extended UEs; transmitting, from the advanced based station to extended UEs, a second configuration including configuration information elements for second CSI measurement and reporting assisting UEs pairing and HARQ retransmission; transmitting, from the advanced based station, a superposition modulated stream of data to the one or more based UEs and the one or more extended UEs, wherein the stream of data comprises a string of precoded symbols for the one or more based UEs and a string of precoded symbols for the one or more extended UEs, and wherein the precoded symbols for the one or more extended UEs are superposition modulated on the precoded symbols for the one or more based UEs.