Macro Node B Handover to Home Node B Using Unique Cell IDs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in wireless mobile networks is to enable seamless handover from macro Node B to home Node B, as the dynamic nature of home Node B deployment and high density of home Node Bs within a macro Node B's coverage area complicates the configuration and updating of neighboring cell lists, leading to issues with signal detection and system resource management.
Innovation Solution
A method where the source radio network control node informs the UE to measure and report the unique ID of the home Node B, allowing the destination radio network control node to establish a radio bearer, using dedicated primary scrambling codes and unique IDs to differentiate home Node Bs within the macro Node B's neighboring cell list, thereby facilitating handover without modifying existing network structures or message formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual configuration of neighboring cell list is used for macro Node B, then network stability is maintained, but the system cannot adapt to dynamic home Node B deployment and high density scenarios
Solution Approach 1:
The macro Node B automatically discovers home Node Bs by monitoring measurement control messages from UEs and autonomously updates its neighboring cell list without manual intervention. This self-service mechanism enables the system to adapt to dynamic home Node B deployment while avoiding the complexity of manual configuration updates.
2Reliability
If all home Node Bs are added to neighboring cell list, then handover capability is improved, but system resource consumption increases due to frequent updates
Solution Approach 1:
The macro Node B adds only those home Node Bs to its neighboring cell list that are actually detected through UE measurement reports, rather than pre-configuring all possible home Node Bs. This partial action approach ensures handover capability for active home Node Bs while minimizing unnecessary system resource consumption.
Solution Approach 2:
The system uses feedback from UE measurement control messages to dynamically determine which home Node Bs should be added to the neighboring cell list. This feedback mechanism ensures that only relevant home Node Bs are included, optimizing the balance between handover capability and resource efficiency.
3Productivity
If primary scrambling codes are reused among home Node Bs, then code resource utilization is improved, but cell identification becomes ambiguous
Solution Approach 1:
The system transitions from relying solely on primary scrambling codes for cell identification to a two-dimensional identification approach: primary scrambling codes for signal detection and unique cell IDs for precise cell identification. This dimensional expansion resolves the ambiguity caused by code reuse while maintaining efficient code resource utilization.
Data Source
AI summary
A method for supporting handover from macro Node B to home Node B is proposed according present invention, comprising: informing, by a source radio network control node of a UE1 the UE of configuration parameters of a cell to be measured and indicating the UE to report a unique ID of the measured cell; measuring, by the UE, a signal from the home Node B, and after reading the home Node B's unique ID from the home Node B's system information, reporting the measurement result to said source radio network control node of the UE, said measurement result including the home Node B's unique ID; and sending, by said source radio network control node, a message to a destination radio network control node of said home Node B specified by said unique ID, so that the destination radio network control node can establish radio bearer in the home Node B for the UE.