Interleaving Pre-Compensation for NTN Random Access
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Solution Overview
Problem
Current wireless communication systems, particularly in non-terrestrial networks (NTNs), face challenges such as long round-trip times, Doppler frequency shifts, and deep fading, which lead to repeated random access attempts and increased latency in establishing communication links.
Innovation Solution
The implementation of interleaving pre-compensation for random access transmissions, where user equipment (UE) sends multiple random access transmissions with differing pre-compensations for Doppler effects and timing delays, allowing for improved synchronization and increased success rate in random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple random access transmissions are sent with different pre-compensations, then the success rate of random access procedures increases, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing multiple pre-compensation values before random access transmissions. The UE determines a first pre-compensation value based on expected Doppler shifts and timing delays, then uses these pre-computed values across multiple transmissions without real-time calculation, reducing operational complexity while maintaining high success rates.
Solution Approach 2:
The patent changes parameters by varying pre-compensation values across multiple random access transmissions. The UE applies different pre-compensation values (first, second, third values) to different transmissions, where these values represent different combinations of Doppler shift compensations and timing delay compensations, allowing the system to adapt to varying channel conditions without increasing device complexity.
2Loss of time
If multiple random access transmissions are sent with different pre-compensations, then latency in establishing communication links is reduced, but the use of energy increases
Solution Approach 1:
The patent applies partial action by sending a limited number of pre-compensated transmissions (first, second, third transmissions) rather than continuous transmissions. The UE sends multiple transmissions with different pre-compensations but stops after receiving an acknowledgment or after a predetermined number of attempts, avoiding excessive energy consumption while still reducing latency compared to single transmission attempts.
Solution Approach 2:
By pre-calculating pre-compensation values before transmissions, the UE avoids real-time calculations during the random access procedure, reducing the time and energy required for each transmission attempt. This preliminary preparation allows faster execution of multiple transmissions without proportionally increasing energy consumption.
3Stability of the object's composition
If pre-compensation for Doppler effects and timing delays is applied, then synchronization is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by determining pre-compensation values in advance based on expected Doppler shifts and timing delays. The UE calculates these values before transmissions occur and stores them for use during random access procedures, eliminating the need for complex real-time calculation mechanisms while maintaining synchronization accuracy.
Solution Approach 2:
The patent manages device complexity by changing parameters in a controlled manner - using a finite set of pre-determined pre-compensation values rather than continuous parameter adjustment. The UE selects from predetermined combinations of Doppler shift compensations and timing delay compensations, simplifying the control logic while achieving effective synchronization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces latency, increases the success rate of random access procedures, and enhances the capacity of random access resources, thereby improving overall wireless communication performance in NTN environments.
Implementation Method 1
differing pre-compensations for Doppler effects and timing delays
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for applying interleaving pre-compensation for random access communications. A method for wireless communications by an apparatus includes obtaining a configuration for pre-compensating at least one transmission associated with at least one random access communication; sending a plurality of transmissions for random access in accordance with the configuration; in response to sending the plurality of transmissions, receiving one or more transmissions; and communicating with a network entity based at least in part on the one or more transmissions.