Radio Controller Mass Random Access Management
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Solution Overview
Problem
In radio access networks, mass registration events can lead to collisions on random access radio channels, causing interference and delaying or preventing group-call services, as numerous subscriber devices attempt to register simultaneously, making it difficult to distinguish between mere interference and mass random access events.
Innovation Solution
A method and apparatus that involves monitoring radio channels for synchronization and error correction, broadcasting instructions to subsets of subscriber devices to manage random access requests, and determining the cause of interference conditions to differentiate between interferers and mass random access events, thereby managing channel access effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If all subscriber devices are allowed to transmit random access requests simultaneously on the radio channel, then registration speed is improved, but channel interference increases and collision probability increases
Solution Approach 1:
The radio controller segments the subscriber devices into different subsets and assigns different time slots or frequency resources for random access transmission. This segmentation reduces simultaneous transmissions on the same channel, lowering collision probability while maintaining overall registration speed through parallel processing of different subsets.
Solution Approach 2:
The system implements periodic random access opportunities where subscriber devices transmit in scheduled intervals rather than continuously. The radio controller broadcasts periodic random access grants that allow devices to transmit at specific times, reducing interference while ensuring all devices can eventually register.
2Reliability
If the radio controller monitors and manages random access requests, then service reliability is improved, but system complexity increases
Solution Approach 1:
Subscriber devices autonomously monitor channel conditions and self-adjust their random access transmission timing based on broadcasted interference levels and collision patterns. The radio controller only provides guidance signals rather than direct control, reducing controller complexity while maintaining service reliability through distributed intelligence.
Solution Approach 2:
The radio controller implements feedback mechanisms where it monitors random access collision rates and broadcasts adjustment parameters to subscriber devices. Devices use this feedback to modify their transmission behavior, creating a closed-loop system that improves reliability without requiring complex centralized control logic.
3Object-affected harmful factors
If random access requests are restricted to subsets of subscriber devices, then channel interference is reduced, but registration time increases
Solution Approach 1:
The system dynamically adjusts the size and composition of subscriber device subsets allowed to transmit random access requests based on real-time channel conditions. When interference is high, fewer devices are restricted; when conditions improve, more devices are permitted to transmit, optimizing the balance between interference reduction and registration speed.
Solution Approach 2:
The radio controller performs preliminary assessments of channel conditions and pre-schedules random access opportunities for different subscriber subsets before actual transmissions occur. This advance planning allows devices to prepare and transmit efficiently when their turn arrives, minimizing total registration time while preventing interference.
Data Source
AI summary
A radio controller monitors a radio channel for a first period of time and determines a first indication of signals received without detecting synchronization or with detecting synchronization but failing error correction during that time. Responsive to determining that the first indication is above a predetermined threshold indicative of an interference condition, causing an instruction to be broadcast identifying a subset of subscriber devices allowed transmitting random access requests on the radio channel. The radio controller monitors the radio channel for a second period of time and determines a second indication during that time. If the second indication is an improvement over the first indication, the radio controller determines that the interference condition is caused by the mass random access event.