Uplink OCC Timing Alignment for NTN Capacity and Coverage
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Solution Overview
Problem
In non-terrestrial network (NTN) systems, the uplink transmission burden is increased due to the limited availability and alignment issues of orthogonal cover codes (OCC) sequences, leading to challenges in enhancing uplink capacity and coverage.
Innovation Solution
A method for determining a start time-domain position for uplink transmissions using an OCC sequence, aligned based on first information related to the OCC sequence set and multiple uplink transmissions, ensuring synchronization among terminal devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If orthogonal cover codes (OCC) sequences are used to enhance uplink capacity and coverage, then uplink performance is improved, but alignment issues and limited availability of OCC sequences increase the uplink transmission burden
Solution Approach 1:
The patent changes the timing parameters of OCC sequences by introducing a start time-domain position that is aligned across multiple terminal devices. This parameter adjustment allows OCC sequences to be applied at synchronized time points, resolving the alignment issue while maintaining uplink capacity enhancement without increasing transmission burden
Solution Approach 2:
The patent performs preliminary alignment of OCC sequence timing before uplink transmissions occur. By determining and communicating the start time-domain position in advance, terminal devices can synchronize their OCC sequence application, eliminating alignment issues during actual transmission and reducing the overall uplink transmission burden
2Productivity
If orthogonal cover codes (OCC) sequences are used to enhance uplink capacity and coverage, then uplink performance is improved, but alignment issues of OCC sequences worsen synchronization among terminal devices
Solution Approach 1:
The patent modifies the timing parameter of OCC sequences by defining a specific start time-domain position that is common across multiple terminal devices. This parameter change ensures that all terminal devices apply their OCC sequences at the same time points, achieving synchronization while maintaining the uplink capacity benefits of OCC usage
3Productivity
If orthogonal cover codes (OCC) sequences are used for multiple uplink transmissions, then uplink capacity is enhanced, but the limited availability of OCC sequences becomes a constraint
Solution Approach 1:
The patent makes the OCC sequence timing arrangement universal across multiple terminal devices by establishing a common start time-domain position. This allows the same OCC sequences to be reused by different terminal devices at synchronized time points, effectively increasing the availability and utility of limited OCC sequences while enhancing overall uplink capacity
Solution Approach 2:
The patent performs preliminary determination and communication of the start time-domain position for OCC sequences before uplink transmissions. This advance planning allows multiple terminal devices to coordinate their use of limited OCC sequences, maximizing their utilization across multiple transmissions without requiring additional OCC sequences
Data Source
AI summary
Disclosed are a method and apparatus for wireless communication. One example method includes: determining a first orthogonal cover code (OCC) sequence; determining, based on first information, a start time-domain position for an uplink transmission based on the first OCC sequence; and performing, an uplink transmission by using the first OCC sequence, wherein the first OCC sequence is an OCC sequence in an OCC sequence set that is received from a network device, and the first information is associated with timing of at least one of the OCC sequence set or the uplink transmission.