Wireless Random Access Gating for Satellite IoT Coverage Time
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Solution Overview
Problem
In satellite-integrated internet of things networks, the high mobility of satellites leads to a high access failure rate during random access procedures due to insufficient coverage time and prolonged time occupied by repeated transmissions, resulting in reduced communication efficiency and power wastage.
Innovation Solution
A wireless communication method that determines an access condition based on parameters like location, timing advance rate, Doppler values, and remaining coverage time, allowing access only when the condition is met, thereby reducing the probability of failed random access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random access is performed without checking coverage time conditions, then access procedure is simple, but access failure rate increases due to insufficient coverage time
Solution Approach 1:
The patent applies preliminary action by evaluating coverage time conditions before initiating the random access procedure. The terminal device checks whether the current cell or beam will provide sufficient coverage time for the required repeated transmissions before starting random access. This preliminary evaluation prevents access attempts that would inevitably fail due to insufficient coverage, thereby improving access success rate without requiring complex real-time adjustments during the access process.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal device receives and processes information about coverage time, location, and other parameters from the network side. The terminal evaluates these feedback parameters to determine whether to proceed with random access. This feedback loop enables the system to adapt access decisions based on actual coverage conditions, resolving the contradiction between simple access procedure and high access success rate.
2Reliability
If repeated transmissions are performed to enhance coverage, then coverage is improved, but time occupied by random access is prolonged
Solution Approach 1:
The patent applies preliminary action by determining in advance whether the current cell or beam provides sufficient coverage time for the required repeated transmissions. The terminal evaluates coverage time parameters before initiating random access, so that access is only attempted when the coverage window is adequate. This prevents time-wasting repeated transmissions that would occur if the terminal waited for coverage to improve during the access process, thereby reducing overall access time while maintaining coverage reliability.
Solution Approach 2:
The patent implements dynamic adaptation by adjusting access decisions based on real-time coverage conditions. The terminal continuously monitors coverage time, location, and other parameters to dynamically determine whether to proceed with random access or wait for better conditions. This dynamic approach optimizes the balance between coverage reliability and access time, allowing the system to respond flexibly to changing satellite positions and coverage characteristics.
3Adaptability or versatility
If random access is performed in satellite-integrated internet of things networks, then connectivity is established, but access failure rate increases due to satellite mobility
Solution Approach 1:
The patent applies preliminary action by evaluating coverage time and location conditions before initiating random access in the satellite-integrated internet of things network. The terminal device checks whether the current cell or beam will maintain connectivity long enough to complete the random access procedure and subsequent data transmissions. This preliminary evaluation is particularly important in satellite-mobile networks where rapid satellite movement creates dynamic coverage conditions, and it prevents access attempts that would fail due to insufficient connectivity time, thereby reducing access failure rate while maintaining network adaptability.
Solution Approach 2:
The patent implements parameter changes by adjusting access parameters based on satellite mobility characteristics and coverage conditions. The terminal modifies access timing, repetition counts, and other parameters according to the evaluated coverage time and location parameters. This adaptive parameter adjustment enables the system to accommodate the high mobility of satellites while maintaining reliable access, resolving the contradiction between network connectivity and access failure rate.
Data Source
AI summary
Embodiments of this application provide a wireless communication method and an apparatus. The method includes: A first communication apparatus receives first information, where the first information indicates a determining threshold of a parameter in a first parameter set, and the first parameter set includes at least one of the following parameters: location information, delay information, a timing advance rate, a rate of the timing advance rate, a Doppler value, a Doppler rate, and remaining coverage time. The first communication apparatus determines, based on the first information, whether an access condition is met, and performs random access when the access condition is met. This avoids a random access failure in a current cell and re-access in a next cell due to random access performed when the condition is not met.