OTFS Basis Allocation for Inter-Symbol Interference Reduction
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Solution Overview
Problem
Current wireless communication systems, such as 3GPP LTE, face challenges in achieving low latency and high connectivity required for future 5G technologies, particularly with the advent of real-time control and tactile internet applications, where data request latency needs to be reduced to 1 ms and massive UE connectivity is necessary.
Innovation Solution
A method and device for receiving orthogonal time, frequency, and space (OTFS) basis allocation information in a wireless communication system using an OTFS transmission scheme, where user equipment receives control information about OTFS basis size and indexes data in an N×N OTFS transform matrix to maximize cyclic frequency and time shifts, mitigating inter-symbol interference (ISI).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional wireless communication systems (LTE) are used, then system compatibility and existing infrastructure are maintained, but data request latency remains at 10 ms and connectivity density is limited
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional LTE frame structure to OTFS transmission scheme, changing fundamental system parameters including latency (from 10ms to 1ms), connectivity density (to 1,000,000/km2), and transmission methodology (using N×N OTFS transform matrix with cyclic shifts in time and frequency domains)
2Reliability
If OTFS basis allocation is implemented, then communication performance improves and ISI is reduced, but system complexity increases due to N×N transform matrix processing
Solution Approach 1:
The patent applies segmentation by dividing the complex OTFS transmission process into distinct functional components: basis allocation module that receives and processes control information, transform matrix generation unit that creates N×N OTFS transform matrix, and indexing mechanism that organizes bases according to pre-defined rules. This modular approach manages complexity while maintaining performance benefits
3Quantity of substance
If massive UE connectivity is implemented, then network capacity increases, but interference management and resource allocation become more difficult
Solution Approach 1:
The patent applies dimensionality change by introducing a two-dimensional transform domain (time and frequency domains) through the N×N OTFS transform matrix. This additional dimensional structure enables more efficient resource allocation and interference management for massive connectivity scenarios by orthogonalizing signals across both time and frequency dimensions simultaneously
Data Source
AI summary
A method for receiving orthogonal time, frequency and space (OFTS) basis allocation information by an user equipment in a wireless communication system using an OTFS transmission scheme includes receiving control information including information on an OTFS basis size N from a base station; and receiving data on OTFS bases of a predetermined size indexed according to a pre-defined rule in an N×N OTFS transform matrix on time and frequency domains corresponding to the OTFS basis size, wherein the OTFS bases of the OTFS basis size N is represented into an N×N OTFS transform matrix, wherein in the N×N OTFS transform matrix, a row index represents a cyclic frequency shift index, and a column index represents a cyclic time shift index, wherein the indexing according to the pre-defined rule includes indexing the OTFS bases of the predetermined size in an order such that the cyclic frequency shift and the cyclic time shift in the N×N OTFS transform matrix are maximized.