Independent Uplink Downlink Frequency Selection
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Solution Overview
Problem
Conventional mobile station frequency selection methods lead to inefficiencies and increased risk of inter-frequency handoffs due to differing available carrier frequencies in neighboring areas, resulting in higher dropped call rates and uneven resource utilization.
Innovation Solution
A mobile station independently selects both uplink and downlink carrier frequencies from a list provided by a base station, allowing for flexible frequency pairing that does not necessarily adhere to standard frequency separations, thereby reducing inter-frequency handoffs and optimizing RF resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mobile station automatically uses a corresponding uplink carrier frequency based on standard frequency separation after selecting a downlink carrier frequency, then the frequency selection process is simple and fast, but it leads to uneven resource utilization and increased risk of inter-frequency handoffs when neighboring areas have different available carrier frequencies
Solution Approach 1:
The patent segments the frequency selection process into two independent parts: downlink frequency selection and uplink frequency selection. Instead of automatically pairing uplink frequency with downlink frequency based on standard separation, the mobile station independently selects uplink frequency from available uplink frequencies and downlink frequency from available downlink frequencies. This segmentation allows each frequency selection to be optimized separately for the specific area, reducing inter-frequency handoffs while maintaining operational simplicity through independent selection algorithms.
2Quantity of substance
If multiple uplink and downlink carrier frequencies are used to increase network capacity, then more mobile stations can communicate simultaneously, but it becomes difficult to balance the usage of different carriers and manage frequency resources efficiently
Solution Approach 1:
The patent changes the parameter of frequency pairing by allowing independent selection of uplink and downlink frequencies rather than maintaining fixed standard frequency separation. The base station provides separate listings of available uplink frequencies and downlink frequencies, and the mobile station independently selects from each list. This parameter change enables flexible frequency pairing that adapts to local availability, balancing carrier usage across multiple frequencies while simplifying mobile station implementation.
3Adaptability or versatility
If neighboring areas have different available carrier frequencies, then each area can optimize for local conditions, but mobile stations experience increased inter-frequency handoffs and higher dropped call rates when moving between areas
Solution Approach 1:
The patent introduces dynamics into the frequency selection system by allowing the set of available uplink and downlink frequencies to vary by geographic area while maintaining a consistent selection mechanism. Each area can dynamically configure which frequencies are available in its uplink and downlink listings, and mobile stations adapt to local conditions by selecting from the provided listings. This dynamic approach allows local optimization while ensuring seamless handoffs, as the independent frequency selection continues to work effectively across area boundaries.
Data Source
AI summary
A mobile station receives at least one frequency listing that identifies M downlink frequencies that may be used to receive communications from a wireless telecommunications network and N uplink frequencies that may be used to transmit communications to the wireless telecommunications network (M and N are integers greater than one). The mobile station selects a downlink frequency from among the M downlink frequencies and selects an uplink frequency from among the N uplink frequencies, independently of the downlink frequency. To make these selections, the mobile station may use a downlink hashing algorithm to map an identifier of the mobile station (such as MDN, MIN, IMSI, or ESN) to one of the M downlink frequencies and an uplink hashing algorithm to map the identifier to one of the N uplink frequencies.