TA-NOMA Time Offset Allocation for Multi-UE Interference Control
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Solution Overview
Problem
The challenge in implementing time-asynchronous nonorthogonal multiple access (TA-NOMA) systems is determining optimal individual-time offsets for each user equipment (UE) due to continuously changing channel conditions, requiring methods to set and manage these offsets effectively.
Innovation Solution
A method for transmitting and receiving signals using a time offset in TA-NOMA systems involves identifying bit streams for multiple UEs, determining time offsets based on the number of UEs and pulse shape, configuring pre- and post-coding matrices, and allocating resources to maximize data rate and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If time offsets are determined based on continuously changing channel conditions, then transmission efficiency is improved, but system complexity increases due to dynamic offset management
Solution Approach 1:
The patent implements dynamic time offset adjustment where the base station determines and updates time offsets for each UE based on real-time channel conditions. The time offset is not fixed but adapts dynamically through feedback mechanisms, allowing the system to optimize transmission efficiency while managing complexity through structured adaptation rules.
Solution Approach 2:
The system employs feedback loops where UEs report channel state information and reception status to the base station. The base station uses this feedback to determine optimal time offsets and adjusts them dynamically. This feedback mechanism enables efficient adaptation without requiring overly complex centralized control, as each adjustment is guided by actual system performance data.
2Reliability
If individual time offsets are set for each UE, then interference is minimized and spectral efficiency improves, but device complexity and offset management burden increase
Solution Approach 1:
The patent assigns individualized time offsets to each UE based on their specific channel conditions, distance from the base station, and interference environment. This local optimization ensures that each user experiences minimized interference tailored to their unique situation, rather than applying a uniform offset strategy that would be less effective for all users.
Solution Approach 2:
The system changes the time offset parameter dynamically for each UE based on varying channel conditions. By adjusting this critical parameter individually and adaptively, the system achieves better interference minimization and spectral efficiency while managing complexity through parameter-based control rather than structural complexity.
3Quantity of substance
If time-asynchronous NOMA is implemented to support more UEs, then network capacity increases, but difficulty in detecting and measuring optimal offsets increases
Solution Approach 1:
The patent segments the time offset determination process into manageable components: channel condition assessment, initial offset calculation, feedback collection, and iterative refinement. This segmentation allows the base station to handle multiple UEs systematically, determining offsets in an organized manner rather than attempting to optimize all offsets simultaneously, thereby reducing detection and measurement difficulty.
Solution Approach 2:
The system performs preliminary time offset determination based on initial channel conditions before actual data transmission begins. This preliminary action establishes a starting point for offset values that can be refined through feedback. By preparing offset values in advance based on available information, the system reduces the complexity of real-time offset detection and measurement during active communication.
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate than a 4G system such as LTE. A method in which a base station transmits a signal by using a time offset in a time-asynchronous non-orthogonal multiple access (TA-NOMA) system, according to an embodiment of the present disclosure, comprises the steps of: checking a first bit stream for a first terminal, and a second bit stream for a second terminal; determining a time offset for the second terminal on the basis of the number of terminals operating in the TA-NOMA system and a pulse shape used in the TA-NOMA system; and transmitting a first signal corresponding to the first bit stream and a second signal corresponding to the second bit stream on resources that are allocated based on the time offset.