Non-Orthogonal Multiple Access Terminal-Specific Transmission Patterns
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Solution Overview
Problem
Current 5G communication systems face challenges in efficiently providing services that require high data rates, low latency, and wide coverage for diverse applications such as enhanced mobile broadband, massive machine-type communications, and ultra-reliable low-latency communications, particularly in IoT environments, where traditional multiple access schemes struggle to differentiate and manage data channels from multiple terminals effectively.
Innovation Solution
The implementation of a non-orthogonal multiple access (NOMA) scheme that involves terminal-specific transmission patterns, including bit-wise scrambling, interleaving, spreading, and power assignment, allows for effective data channel transmission and reception by using terminal-specific cyclic shifts, interleaver sizes, and multiple access signatures, enabling the base station to distinguish and decode data channels from different terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional multiple access schemes are used, then system implementation is simple, but the ability to differentiate and manage data channels from multiple terminals is insufficient
Solution Approach 1:
The patent segments the data channel into multiple components: base sequence, cyclic shift, and spreading code. Each terminal is assigned a unique combination of these segments, enabling fine-grained differentiation. The base sequence is divided into multiple cyclic shifts, and each cyclic shift is further divided into multiple spreading codes, creating a hierarchical segmentation structure that increases channel differentiation capability while maintaining manageable complexity.
Solution Approach 2:
The patent introduces an additional dimension for channel differentiation by applying spreading codes in the time domain across multiple symbols within each slot. This transforms the differentiation mechanism from a single-dimensional (cyclic shift only) to a multi-dimensional approach, where terminals are distinguished by combinations of cyclic shift values and spreading code patterns, significantly enhancing the number of available orthogonal channels.
2Adaptability or versatility
If non-orthogonal multiple access with terminal-specific patterns is implemented, then data channel differentiation is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-generating and storing spreading code sequences for each cyclic shift before actual data transmission. The terminal-specific transmission pattern, including the combination of cyclic shift and spreading code, is determined and configured in advance through RRC signaling. This preprocessing eliminates the need for complex real-time generation of terminal-specific patterns during data transmission, reducing processing complexity while maintaining high differentiation capability.
Solution Approach 2:
The patent introduces an intermediary layer in the form of a standardized function for generating spreading code sequences. This function takes the cyclic shift value as input and produces the corresponding spreading code sequence, acting as a mediator between the cyclic shift assignment and the actual spreading operation. This intermediary function simplifies the overall processing by providing a systematic and reusable mechanism for generating terminal-specific spreading codes.
3Adaptability or versatility
If terminal-specific transmission patterns are used, then service provision for diverse IoT applications is enhanced, but signaling overhead increases
Solution Approach 1:
The patent applies universality by designing a multi-functional terminal-specific transmission pattern that simultaneously supports multiple services and applications. The same pattern structure (base sequence + cyclic shift + spreading code) is used for different terminal types and service requirements, including IoT devices, enhanced mobile broadband, and ultra-reliable low-latency communications. This universal framework reduces signaling overhead by avoiding the need for separate configuration mechanisms for each service type.
Solution Approach 2:
The patent utilizes parameter changes to provide service diversity without increasing signaling overhead. By varying the parameters (cyclic shift value, spreading code sequence, and their combination), the system can adapt to different service requirements such as different data rates, latency constraints, and reliability needs. The base station dynamically adjusts these parameters based on channel conditions and service requirements, enabling flexible service provision while maintaining efficient signaling through a unified configuration approach.
Data Source
AI summary
Provided is a communication method using a non-orthogonal multiple access scheme of a terminal, the communication method including: obtaining configuration information about a transmission pattern of the terminal; determining a terminal-specific transmission pattern, based on the obtained configuration information; processing data to be transmitted, based on the determined terminal-specific transmission pattern; and transmitting the processed data.