Access Control Barring for Coverage Enhancement Levels
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Solution Overview
Problem
In LTE and new generation telecommunication systems, particularly in enhanced coverage scenarios for NB-IOT and eMTC, the AC barring mechanism leads to excessive resource consumption due to repeated access attempts at a coverage enhancement level when they fail, as terminals continue trying without proper barring.
Innovation Solution
A method and apparatus for access control barring that involves performing an access attempt at a designated coverage enhancement level, determining a corresponding access attempt barring scheme based on a preset rule, and implementing barring actions such as terminating or continuing attempts based on error notifications, thereby reducing resource consumption and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals continue to attempt access at the current CE level after failure, then access reliability is improved, but resource consumption increases significantly
Solution Approach 1:
The patent applies preliminary action by performing AC barring check before the random access process. The terminal determines whether to allow access attempt based on AC barring parameters obtained prior to access, preventing unnecessary access attempts that would consume resources. This advance check mechanism stops terminals from continuously retrying at the same CE level when access conditions are not met, thus reducing resource consumption while maintaining access reliability for legitimate requests.
2Loss of energy
If AC barring is implemented based on CE level, then resource consumption is reduced, but access reliability deteriorates due to premature termination of attempts
Solution Approach 1:
The patent applies local quality by implementing differentiated AC barring strategies for different CE levels. Each CE level has its own AC barring parameters and check mechanisms, allowing the system to optimize resource consumption at each specific coverage enhancement level while maintaining appropriate access reliability. The terminal performs AC barring check at the designated CE level where the random access message is to be sent, ensuring that barring is applied locally and appropriately rather than uniformly across all CE levels.
3Reliability
If multiple access attempts are allowed at designated CE level, then access reliability is improved, but device complexity increases due to additional barring schemes
Solution Approach 1:
The patent applies universality by using a unified AC barring mechanism that works across all CE levels. The same AC barring parameters and check procedures are universally applied regardless of which CE level the terminal is operating at. This multi-functional approach allows the AC barring mechanism to serve all coverage enhancement scenarios with a single standardized process, avoiding the need for separate complex barring schemes for each CE level while still enabling multiple access attempts with appropriate resource management.
Data Source
AI summary
The present disclosure relates to a method and an apparatus for access control barring. The method includes: performing an access attempt at a designated coverage enhancement level; when the access attempt fails, determining a corresponding access attempt barring scheme based on a preset rule; and performing corresponding access attempt barring based on the corresponding access attempt barring scheme. Therefore, the present disclosure can avoid unlimited access attempts at the designated coverage enhancement level, thereby reducing resource consumption and improving the reliability of access control barring.