Home NodeB Interference Management via NodeB Controller
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Solution Overview
Problem
Existing interference management systems between Home NodeB (HNB) and macro cells face challenges in timely and effective interference reduction due to terminal capabilities and time delays in acquiring interference source identities, leading to service interruptions and dropped calls.
Innovation Solution
A method and system where the Home NodeB registers with a NodeB Controller, allowing for the determination of interference sources based on measurement information from terminals, enabling power adjustments to be made by the NodeB Controller to reduce interference, thereby avoiding the need for terminals to acquire interference source identities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal reads the system message of the interference source HNB to acquire cell identity, then interference management can be performed, but service interruption occurs and call drops happen due to time delay
Solution Approach 1:
The HNB performs preliminary actions by proactively sending its cell identity and other information to the RNC before interference occurs. The RNC stores this information in advance, so when interference is detected through uplink quality degradation, the RNC can immediately identify the interfering HNB without requiring the terminal to read system messages, thus eliminating time delay
Solution Approach 2:
The RNC acts as an intermediary between the HNB and the macro cell. Instead of the terminal directly acquiring the interfering HNB's cell identity, the RNC mediates by receiving advance information from the HNB, processing interference detection, and coordinating power adjustment, thereby streamlining the interference management process
2Reliability
If the terminal reads the system message to acquire cell identity, then interference source can be identified, but terminal capability limitations prevent receiving the system message
Solution Approach 1:
The RNC serves as an intermediary that collects cell identity information from the HNB in advance. When interference is detected, the RNC uses this pre-collected information to identify the interfering HNB, eliminating the need for the terminal to read system messages and thus overcoming terminal capability limitations
Solution Approach 2:
The HNB proactively provides its own cell identity and information to the RNC without requiring the terminal to request or read it. This self-service approach ensures that the interference management system has the necessary information regardless of terminal capabilities
3Productivity
If the HNB and macro cell use the same frequency for networking, then network resource utilization improves, but same frequency interference occurs between macro cell and HNB
Solution Approach 1:
The system implements feedback mechanisms where the RNC continuously monitors uplink signal quality from terminals. When degradation is detected, the RNC identifies the interfering HNB and triggers power adjustment. This closed-loop feedback enables dynamic interference management that allows same-frequency operation while mitigating interference effects
Solution Approach 2:
The HNB transmit power is made dynamic rather than fixed. The RNC adjusts the HNB's power level in real-time based on interference conditions, allowing the system to adaptively balance network resource utilization with interference mitigation by varying power levels according to operational needs
Data Source
AI summary
Disclosed in the present invention are a method, an apparatus and a system for interference management. In the embodiments of the present invention, a Home NodeB (HNB) registers in a macro cell in advance, so that a NodeB Controller (NBC) knows the information of a potential interference source HNB beforehand. Thus simply through a normal measurement and a report subsequently performed by a terminal, an interference source HNB can be found easily, and an interference management of the interference source HNB also can be performed. The solution can avoid the situation in the prior art that the interference management is performed necessarily with a cell identity of the interference source HNB obtained by the terminal. With the application of the solution, the interference management to the HNB can be performed timely and effectively and the interference experienced by the terminal from the HNB is reduced.