Network Switching via Channel Quality Feedback
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Solution Overview
Problem
In the initial stage of 5G New Radio (NR) network deployment, especially during scenarios like network congestion or the need for voice services, there is a fallback from 5G NR to 4G Long Term Evolution (LTE) network, and there is a lack of efficient methods to quickly return to the 5G NR network, affecting user experience.
Innovation Solution
A method is proposed where a network device determines whether to switch the service network from a first network to a second network based on channel quality status information, obtained and reported by a terminal device, to ensure optimal use of the 5G NR network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network falls back from 5G NR to 4G LTE network, then network service continuity is maintained, but the network switching speed and user experience deteriorate
Solution Approach 1:
The network device performs preliminary actions by obtaining channel quality status information of the second network before the first service actually ends. This advance preparation enables the network to quickly determine whether to switch back to 5G NR network when the service ends, rather than waiting and then making the decision, thus resolving the contradiction between maintaining service continuity and achieving fast switching speed.
2Speed
If the network device obtains channel quality status information in advance, then the network switching decision speed improves, but the network device complexity increases
Solution Approach 1:
The terminal device performs self-service by autonomously measuring and reporting the channel quality status information of the second network to the network device. This eliminates the need for the network device to complexly acquire this information through multiple network nodes, thus achieving fast switching decision speed while keeping the network device complexity low.
Solution Approach 2:
The terminal device acts as an intermediary that bridges the network device and the second network. It measures the channel quality of the second network and reports this information to the network device, simplifying the information acquisition process for the network device and enabling fast switching decisions without increasing network device complexity.
3Loss of information
If the network device periodically receives measurement result reports, then the channel quality information availability improves, but the network signaling overhead increases
Solution Approach 1:
The terminal device provides feedback by reporting channel quality status information to the network device. The network device configures the reporting parameters (period, number of times, specific time unit) based on actual needs, creating an efficient feedback mechanism that ensures channel quality information availability while controlling signaling overhead through selective and targeted information collection.
Data Source
AI summary
Provided are a network switching method, a network device, and a terminal device. The method comprises: a network device acquiring channel quality state information, the channel quality state information being used to reflect the channel quality of a second network; and when the network device determines that a first service ends or a serving network of a terminal device does not support the first service, determining, according to the channel quality state information, whether to switch the serving network from a first network to the second network.