Dynamic Physical Cell ID Assignment for Mobile Relay Nodes
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Solution Overview
Problem
The limited number of available physical cell IDs in mobile communication networks restricts the number of active mobile relay nodes and mobile radio cells, leading to confusion and collision situations due to the reuse of IDs, especially among neighboring cells.
Innovation Solution
A method of dynamically assigning physical cell IDs to mobile relay nodes, allowing fixed nodes to manage the allocation of IDs for mobility, including signal strength measurement for handover procedures and ID reassignment through RRC and X2 messages, ensuring unique identification and preventing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If physical cell IDs are statically assigned to mobile relay nodes, then the network configuration is simple, but the number of active mobile relay nodes is limited by the finite pool of physical cell IDs
Solution Approach 1:
The patent implements dynamic physical cell ID assignment where the pool of physical cell IDs is not statically allocated but dynamically assigned to mobile relay nodes based on current network conditions and availability. This allows the system to adapt to varying numbers of active relay nodes without being constrained by a fixed ID allocation scheme.
Solution Approach 2:
The system changes the assignment parameters of physical cell IDs from static to dynamic, allowing the same physical cell ID to be reused across different mobile relay nodes at different times. This parameter change enables the network to support more relay nodes than the size of the physical cell ID pool would otherwise allow.
2Adaptability or versatility
If physical cell IDs are reused in neighboring cells, then the number of supported radio cells increases, but confusion and collision situations occur
Solution Approach 1:
The patent implements feedback mechanisms where the network monitors for conflicts and collisions when assigning physical cell IDs to mobile relay nodes. When a conflict is detected or predicted, the system adjusts future ID assignments to avoid the problematic IDs, ensuring that neighboring cells do not receive conflicting identifiers.
Solution Approach 2:
The system performs preliminary checks and validations before assigning physical cell IDs to mobile relay nodes. By proactively checking for potential conflicts with existing assignments in neighboring cells, the system prevents confusion and collision situations before they occur, maintaining identification uniqueness even as IDs are reused across the network.
3Adaptability or versatility
If dynamic physical cell ID assignment is implemented, then the number of active mobile relay nodes increases, but the complexity of ID management increases
Solution Approach 1:
The patent introduces intermediary management entities and procedures that handle the complexity of dynamic physical cell ID assignment. These intermediaries automate the allocation, tracking, and conflict resolution processes, shielding the core network functions from the complexity of managing a dynamic ID pool while still enabling support for numerous mobile relay nodes.
Data Source
AI summary
The present invention concerns a method of providing communication over a mobile communication network (1) and components for providing communication over the communication network (1). The network (1) includes two or more fixed nodes (2a, 2b) each operating a fixed radio cell (3a, 3b) for serving one or more user equipments (4) via a first radio interface (5a, 5b). Each of these fixed radio cells (3a, 3b) is identified by a physical cell ID (6a, 6b) selected out of a set of N physical cell IDs. In addition, the network (1) includes one or more mobile relay nodes (7) served by the one or more fixed nodes (2a, 2b) via a second radio interface (8a, 8b). The mobile relay nodes (7) each operate a mobile radio cell (9) for serving one or more user equipments (4) via a third radio interface (10). Each of these mobile radio cells (9) is identified by a physical cell ID (6c) selected out of the set of N physical cell IDs. The method includes the step of dynamically assigning a physical cell ID (6c) of the set of N physical cell IDs to the one or more mobile radio cells (9).