Mobile Station Band Selection Using Equivalent Indicators
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Solution Overview
Problem
In W-CDMA and LTE schemes, mobile stations are required to pass authentication tests in all bands for connection, but there is no clear guidance on which band indicator to use when multiple overlapping bands are indicated, leading to ambiguity in connection processes.
Innovation Solution
A mobile communication method where a radio base station broadcasts both a primary band indicator and an equivalent band indicator, allowing the mobile station to perform connections in the primary band if compatible, and in an overlapping band if not compatible with the primary band but compatible with the equivalent band, ensuring appropriate band usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a radio base station broadcasts only one band indicator, then the signaling is simple and clear, but the mobile station cannot connect in overlapping frequency bands that it may be compatible with
Solution Approach 1:
The band indicator is segmented into multiple parts: a first band indicator for the primary band and a second band indicator for the equivalent overlapping band. This segmentation allows the system to provide both simplicity (by having clear primary band indication) and adaptability (by providing fallback equivalent band indication) without significantly increasing overall signaling complexity.
Solution Approach 2:
The second band indicator acts as an intermediary or fallback option. When the mobile station cannot connect to the first band indicated by the first band indicator, it uses the second band indicator as an intermediate step to find an equivalent overlapping band where connection is possible, thus resolving the contradiction between simple signaling and broad adaptability.
2Adaptability or versatility
If equivalent band indicators are broadcast for overlapping bands, then the mobile station can connect in more bands, but it is not defined which band indicator the mobile station must use
Solution Approach 1:
Instead of allowing the mobile station to choose arbitrarily between multiple band indicators, the system inverts the approach by establishing a clear hierarchy: the mobile station must first attempt to connect using the first band indicator, and only if that fails should it consider the second band indicator. This inversion of the selection logic provides clarity while maintaining adaptability.
Solution Approach 2:
The system performs preliminary action by pre-defining the connection priority: the mobile station is instructed to attempt connection in the first band before considering equivalent bands. This preliminary guidance eliminates ambiguity in the connection process while still allowing flexible band selection based on compatibility.
3Reliability
If the mobile station attempts connection in all indicated bands, then it ensures finding a compatible band, but the connection process becomes inefficient and time-consuming
Solution Approach 1:
The connection process is made dynamic through a hierarchical approach: the mobile station first attempts connection in the primary band indicated by the first band indicator, and only dynamically transitions to attempting equivalent bands if the primary attempt fails. This dynamic adaptation maintains high connection success rates while preserving efficiency by avoiding unnecessary attempts in all bands simultaneously.
Data Source
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AI summary
A mobile communication method and a mobile station appropriately use equivalent band indicators. The mobile communication method includes: a step of broadcasting, by a radio base station BS, a band indicator indicating a band 19 and an equivalent band indicator indicating bands 5 and B26 overlapping the band 19; and a step of performing, by a mobile station UE, an connection process in a band 5 or B26 when the mobile station is not compatible with the band 19 indicated by the received first band indicator and is compatible with the band 5 or B26 indicated by the received equivalent band indicator.