IAB Donor Switching With Proactive RNA Updates
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Solution Overview
Problem
In mobile devices with integrated access and backhaul (IAB) nodes, frequent switching of IAB donors leads to unnecessary radio access network-based notification area updates (RNAU) and tracking area updates (TAU), increasing network complexity and power consumption.
Innovation Solution
A communication method that prohibits RNAU and TAU by updating the terminal device's notification area with new area information when the IAB donor changes, ensuring correct paging without initiating updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device initiates RNAU or TAU frequently due to IAB donor switching, then the network can maintain accurate area information for the terminal device, but the network implementation complexity and signaling overheads increase
Solution Approach 1:
The network side performs preliminary actions by determining the second area information in advance when the IAB donor is switched, and adds this information to the terminal device's RNA before the terminal device would need to initiate RNAU. This proactive update eliminates the need for frequent RNAU initiation while maintaining accurate area information.
2Reliability
If the terminal device initiates RNAU or TAU frequently due to IAB donor switching, then the network can maintain accurate area information for the terminal device, but the signaling overheads increase
Solution Approach 1:
The network side determines the second area information in advance and adds it to the terminal device's RNA before the terminal device would need to initiate RNAU. This preliminary update prevents the need for subsequent RNAU signaling exchanges, thereby reducing overall signaling overheads while maintaining accurate area information.
3Reliability
If the terminal device initiates RNAU or TAU frequently due to IAB donor switching, then the network can maintain accurate area information for the terminal device, but the power consumption of the terminal device increases
Solution Approach 1:
The network side proactively determines the second area information and adds it to the terminal device's RNA in advance, eliminating the need for the terminal device to initiate RNAU or TAU procedures. This prevents unnecessary power consumption from frequent update initiations while ensuring the terminal device has accurate area information for network paging operations.
Data Source
AI summary
A communication method includes sending first information to a terminal device accessing a first relay node. The first information is used for prohibiting the terminal device from sending a radio access network-based notification area update (RNAU). The communication method also includes determining second area information. The second area information indicates a second area in which the terminal device is located in response to the first relay node being connected to a second donor. The communication method also includes adding the second area to a radio access network-based notification area (RNA) of the terminal device. The RNA of the terminal device includes a first area. The first area is an area in which the terminal device is located in response to the first relay node being connected to a first donor.