Hybrid MIMO Control Apparatus Reference Signal Timing Alignment
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Solution Overview
Problem
In hybrid mobile communication systems, the terrestrial user transceiver minimizes satellite signals, preventing the achievement of the diversity effect expected from receiving MIMO terrestrial signals and satellite signals.
Innovation Solution
A control apparatus that estimates the delay time of communication between a communication terminal and non-terrestrial and terrestrial communication apparatuses, controlling the insertion timing of reference signals into signal sequences transmitted to these apparatuses to align with the delay time, ensuring the communication terminal receives reference signals from either apparatus within a predetermined period, thereby achieving the diversity effect in MIMO communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the terrestrial user transceiver minimizes satellite signals, then interference of satellite signal with MIMO terrestrial signal is reduced, but the diversity effect cannot be achieved
Solution Approach 1:
The patent applies preliminary action by having the control apparatus estimate the delay time in advance before transmitting signals. The control apparatus calculates the timing difference between terrestrial and satellite signal paths and pre-adjusts the reference signal transmission timing to compensate for this delay, ensuring signals arrive synchronously at the communication terminal without requiring the terminal to minimize satellite signals
Solution Approach 2:
The control apparatus acts as an intermediary between the signal sources and the communication terminal. It estimates the delay time and controls the transmission timing of reference signals to both terrestrial and satellite paths, mediating the timing coordination so that signals arrive synchronously at the terminal, thereby achieving diversity effect without interference
2Reliability
If reference signals are transmitted simultaneously through both terrestrial and non-terrestrial paths, then signal quality is improved, but timing misalignment occurs due to different propagation delays
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmission timing parameter of reference signals based on the estimated delay time. The control apparatus modifies the timing parameter for signals transmitted through the non-terrestrial path relative to the terrestrial path, ensuring that despite different propagation delays, both signals arrive at the communication terminal with proper timing alignment
Data Source
AI summary
A control apparatus capable of exhibiting the diversity effect in a hybrid mobile communication system using a terrestrial communication apparatus and a non-terrestrial communication apparatus is provided. A control apparatus according to the present disclosure includes a communication unit configured to communicate with a non-terrestrial communication apparatus and a terrestrial communication apparatus, an estimation unit configured to estimate a delay time of communication with a communication terminal through the non-terrestrial communication apparatus from communication with the communication terminal through the terrestrial communication apparatus, a control unit configured to, when MIMO communication is performed with the communication terminal using the non-terrestrial communication apparatus and the terrestrial communication apparatus, control an insertion timing of reference signals to be inserted into a first signal sequence transmitted to the non-terrestrial communication apparatus and a second signal sequence transmitted to the terrestrial communication apparatus, based on the delay time.