Mobile Station Picocell Detection Using Neighbor List Correspondence
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Solution Overview
Problem
The challenge in wireless communication systems is efficiently identifying and locating picocells within a macrocell for accurate handovers, as existing methods require unique user-specific neighbor lists, leading to increased network complexity, signaling overhead, and energy wastage.
Innovation Solution
A mobile station stores a locating neighbor list and uses a detection module to determine correspondence with a current neighbor list, allowing it to identify when it is in the communication range of a picocell, thereby reducing network burden and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If unique user-specific neighbor lists are generated to include home or work picocells, then accurate handover identification is improved, but network complexity and signaling overhead increase significantly
Solution Approach 1:
The patent uses a representative neighbor list that is copied and distributed to multiple mobile stations instead of generating unique neighbor lists for each user. This representative list contains picocell identifiers that can be used by any mobile station in the service area, eliminating the need for complex individualized list generation while maintaining accurate picocell identification capability.
Solution Approach 2:
The neighbor list is designed to serve multiple functions and multiple users simultaneously. A single universal neighbor list structure is created that can be reused across different mobile stations and service areas, reducing network complexity while still enabling accurate handover identification for each user's home or work picocell.
2Reliability
If mobile station continuously searches for home or work picocell, then picocell detection capability is improved, but energy consumption increases and battery life decreases
Solution Approach 1:
The patent pre-configures mobile stations with neighbor lists containing picocell identifiers before the mobile stations need to detect or handover to these picocells. This preliminary provision of identification information eliminates the need for continuous searching, as mobile stations can directly identify and connect to their home or work picocells using the pre-provided identifiers.
Solution Approach 2:
Instead of continuous searching, the patent implements periodic updates of neighbor lists at appropriate intervals or triggered by specific events (such as entering a service area). This periodic approach maintains reliable picocell detection capability while significantly reducing energy consumption compared to continuous searching.
3Productivity
If scrambled code or PN offset re-use is implemented, then network resource efficiency is improved, but incorrect picocell identifications occur
Solution Approach 1:
The patent introduces an intermediary identifier (such as a picocell ID or specific signature) that mediates between the reused scrambled codes/PN offsets and the actual picocell identification. This intermediary allows the system to reuse physical layer resources (scrambled codes and PN offsets) for network efficiency while maintaining accurate picocell identification through the unique intermediary identifier that is not subject to re-use.
Data Source
AI summary
An exemplary method of communicating includes storing a locating neighbor list that corresponds to a mobile station being in a communication range of a selected picocell. Upon receiving a current neighbor list, a determination is made whether the current neighbor list corresponds to the stored, locating neighbor list. If there is sufficient correspondence, that indicates that the mobile station is in a communication range of the picocell.