Satellite Uplink Resource Multiplexing With Orthogonal Sequences
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Solution Overview
Problem
In non-terrestrial networks, the uplink channel load is high due to retransmissions, leading to increased transmission load and reduced spectrum utilization efficiency, necessitating improvements in system capacity and coverage.
Innovation Solution
Utilizing orthogonal cover codes (OCC) to multiplex uplink transmissions among multiple terminal devices on the same resource block, ensuring orthogonality and reducing interference through synchronized channel estimation and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink channels support retransmission, then reliability of uplink communication is improved, but load of uplink transmission increases
Solution Approach 1:
The patent combines multiple terminal devices' uplink transmissions on the same physical resource block by using orthogonal sequences for multiplexing. This merging approach allows retransmission support while sharing the transmission load across multiple devices, reducing the individual load burden while maintaining reliability through orthogonal separation.
Solution Approach 2:
The patent introduces orthogonal sequences as an additional dimension for resource separation. Instead of allocating separate time-frequency resources for each terminal device, the invention adds a sequence dimension that allows multiple devices to share the same physical resource block while maintaining distinguishable transmissions, thus supporting retransmission without proportionally increasing load.
2Productivity
If multiple terminal devices share the same physical resource block, then spectrum utilization efficiency is improved, but interference among terminal devices increases
Solution Approach 1:
The patent applies local quality by assigning different orthogonal sequences to different terminal devices sharing the same physical resource block. Each device experiences a locally optimized transmission quality through its dedicated orthogonal sequence, which provides interference rejection capability. This allows multiple devices to share resources while maintaining individual transmission quality and minimizing mutual interference.
Solution Approach 2:
The patent changes the sequence parameter by using orthogonal sequences with different orthogonal cover codes for different terminal devices. This parameter change in the sequence domain enables multiple devices to transmit on the same physical resource block without causing harmful interference, as the orthogonal properties ensure zero cross-correlation between different devices' transmissions.
Data Source
AI summary
Provided are a method and an apparatus for satellite communication in a non-terrestrial network. One example method includes: receiving, by a first terminal device, first information from a network device in a non-terrestrial network; determining, by the first terminal device, a first sequence based on the first information; and determining, by the first terminal device, an uplink transmission resource on a first resource block based on the first sequence; wherein the first sequence is a sequence corresponding to the first terminal device in a first sequence set, the first sequence set comprises a plurality of mutually orthogonal sequences, the first terminal device is one of a plurality of terminal devices, and the plurality of terminal devices multiplex the first resource block with a plurality of slots based on the plurality of sequences.