Configurable Cell ID Partition for Wireless Network Entry
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Solution Overview
Problem
Current wireless communication systems face challenges in designing a cell ID partition scheme that provides flexible network deployment and efficient utilization of limited cell ID resources with short re-camping time, especially in heterogeneous networks with varying cell types.
Innovation Solution
The implementation of a method involving configurable cell ID partition schemes, including soft and hybrid partitions, where cell IDs are partitioned into non-overlapping subsets with adjustable sizes and indicated by broadcasted partition pointers, allowing mobile stations to quickly identify preferred cell types and adjust to different network environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If cell ID hard partition is used, then re-camping time is reduced and no signaling overhead is required, but adaptability to different network environments is lost
Solution Approach 1:
The patent applies dynamics by making the cell ID partition configuration adjustable and adaptable to different network environments. Instead of using fixed hard partition, the system dynamically configures partition pointers that divide cell IDs into subsets corresponding to different cell types (macrocell, microcell, picocell, femtocell). This allows the network to adapt the partitioning scheme according to deployment scenarios while maintaining fast cell type identification for reduced re-camping time.
Solution Approach 2:
The patent changes the parameter of cell ID partition configuration from fixed to variable. By introducing partition pointers that can be configured with different values to represent different partitioning schemes, the system can adjust the number and size of cell ID subsets based on network requirements. This parameter change enables both fast identification (when needed) and adaptability to various heterogeneous network deployments.
2Ease of operation
If direct broadcasting of cell type information is used, then cell type identification is simplified, but re-camping time increases due to BCH decoding requirement
Solution Approach 1:
The patent applies preliminary action by pre-associating specific cell ID subsets with specific cell types through the partition configuration. Mobile stations can identify cell types by examining cell IDs and comparing them against the partition pointers received in system information, without needing to decode BCH for cell type information. This preliminary association of cell IDs with cell types enables fast identification while maintaining ease of operation.
3Loss of information
If cell ID hard partition is used, then no signaling overhead is introduced, but cell ID efficiency is reduced and cell planning becomes difficult
Solution Approach 1:
The patent makes the cell ID partitioning dynamic and configurable to improve cell ID efficiency. The partition pointers can be configured to create optimal partitions based on network deployment, allowing efficient utilization of limited cell ID resources. This dynamic configuration enables better cell planning and higher cell ID efficiency compared to fixed hard partition, while the partition information is efficiently signaled through existing system information structures.
Data Source
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AI summary
Two preamble partition schemes are provided for flexible network deployment and efficient utilization of limited cell identification resources in a wireless network. In a soft partition scheme, the entire preamble sequences are partitioned into several configurable non-overlapping subsets, and each subset is associated with a corresponding cell type. In a hybrid partition scheme, a combination of fixed and configurable subsets is used for preamble partition. The partitioning information is carried in a broadcasting channel broadcasted from base stations to mobile stations. In one embodiment, after a mobile station performs scanning and synchronization with a first base station, it derives the cell type of the first base station from cell identification and partitioning information. The mobile station completes ranging and network entry with the first base station if the cell type is preferred, and starts to perform scanning and synchronization with a second base station if the cell type is non-preferred.