Random Access Channel Repetition Configuration for IoT Coverage
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Solution Overview
Problem
Current methods for configuring the number of repetitions in random access channels for IoT services, such as video surveillance and industrial sensor detection, lack effectiveness, particularly in establishing connections between base stations and user terminals, leading to inadequate coverage enhancement for high transmission rate and delay requirements.
Innovation Solution
A method for configuring candidate numbers of repetitions by obtaining a configuration parameter set predefined in specifications or notified by broadcasting channels, which includes predefined sets of candidate numbers of repetitions for determining the number of repetitions of random access channels, allowing for pre-connection configuration and enhancing channel coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission method is adopted for coverage enhancement, then transmission reliability is improved, but transmission delay increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple candidate numbers of repetitions in a configuration parameter set before random access occurs. The user terminal can select an appropriate repetition number from the pre-configured candidates based on channel conditions, avoiding the need for repeated retransmissions and reducing delay while maintaining reliability.
Solution Approach 2:
The patent implements dynamics by allowing the user terminal to dynamically select from multiple candidate repetition numbers based on current channel conditions. The configuration parameter set contains multiple candidates (e.g., different coverage enhancement levels) that can be adaptively chosen, making the system flexible rather than fixed.
2Reliability
If coverage enhancement is performed through repeated transmissions, then transmission reliability is improved, but transmission rate decreases
Solution Approach 1:
The patent applies parameter changes by modifying the repetition number parameter from a fixed value to a selectable set of candidates. Different candidate values represent different coverage enhancement levels, allowing the system to adjust the repetition parameter based on channel conditions to balance reliability and transmission rate.
Solution Approach 2:
The configuration parameter set with multiple candidate repetition numbers is prepared in advance through broadcasting or dedicated signaling. This preliminary configuration enables the user terminal to select an optimal repetition number before transmission, avoiding excessive retransmissions that would reduce transmission rate while maintaining necessary reliability.
3Device complexity
If fixed number of repetitions is used for random access channel, then configuration simplicity is maintained, but adaptability to different channel conditions deteriorates
Solution Approach 1:
The patent implements universality by designing a configuration parameter set that serves multiple functions: it provides default repetition numbers for different coverage scenarios, enables adaptive selection based on channel conditions, and maintains backward compatibility. The same configuration mechanism works for various user terminal types and channel conditions without requiring separate configurations.
Solution Approach 2:
Multiple candidate repetition numbers are pre-configured in the configuration parameter set through broadcasting or dedicated signaling before random access occurs. This preliminary action provides the user terminal with multiple options tailored to different channel conditions, enabling adaptability without increasing configuration complexity during the actual access process.
Data Source
AI summary
A method for configuring a candidate number of repetitions, performed by a base station, including: obtaining a configuration parameter set related to candidate numbers of repetitions predefined in a specification or notified by a broadcasting channel, wherein the configuration parameter set related to candidate numbers of repetitions comprises at least one set of candidate numbers of repetitions, and the set of candidate numbers of repetitions is used to determine a number of repetitions of at least one random access channel.