LTE-A Relay Node Location Determination via Donor Cell
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Solution Overview
Problem
In high-speed moving environments, such as railways, existing methods for determining the location of User Equipment (UE) in LTE-A systems are inaccurate due to the assumption that no significant movement occurs when the serving cell information is reported, leading to incorrect location-based charging.
Innovation Solution
A method and device for transmitting location information from a Relay Node (RN) to a control plane management device, which includes receiving and determining the location of the UE based on donor cell information, and sending this information to a charging function node when a change in location occurs, ensuring accurate location determination even when the RN moves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If serving cell information is used to determine UE location, then the location determination is simple, but the location accuracy deteriorates when RN moves
Solution Approach 1:
The patent introduces donor cell information as an intermediary to accurately reflect the UE's location. Instead of directly using serving cell information which becomes inaccurate when RN moves, the system uses the donor cell (to which RN is connected) as a mediator to determine the true location of the UE, thereby resolving the contradiction between simplicity and accuracy
Solution Approach 2:
The patent changes the parameter used for location determination from serving cell information to donor cell information. When RN moves to a different donor cell, the donor cell parameter changes to reflect the new location, maintaining location accuracy without increasing system complexity
2Reliability
If RN moves to a different donor cell, then the UE location changes, but the serving cell information remains unchanged
Solution Approach 1:
The patent implements a feedback mechanism where the control plane management device monitors changes in donor cell information and triggers location updates accordingly. When the donor cell changes (indicating RN movement), the system receives feedback and updates the UE location information, ensuring reliable location-based charging
Solution Approach 2:
The patent performs preliminary action by proactively detecting donor cell changes and updating location information before location-based charging operations are affected. The control plane management device monitors donor cell information and prepares location updates in advance, preventing information loss
Data Source
AI summary
Disclosed is a method for transmitting location information about user equipment, used for determining the location of user equipment more accurately by the core network, benefitting operations such as accurate charging by the core network. The method includes: a control plane management device receiving location information reported by a relay node (RN), wherein the location information includes relevant information about the donor cell where the RN is located; and the control plane management device determining the location of UE according to the received location information, and sending the latest location information about the UE to a charging function node after the location of the UE has changed. Also disclosed is an implementing method for the charging function node side, and a device used for implementing these methods.