Multi-Receiver Carrier Selection Without Session Disruption
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Solution Overview
Problem
Existing wireless communication systems face disruptions and inefficiencies when wireless terminals need to switch between carrier frequencies due to changing conditions, as they typically use a single receiver chain that disrupts communication sessions to search for alternative carriers.
Innovation Solution
Implementing wireless communication devices with multiple receiver chains that can simultaneously evaluate and compare the quality of different carrier frequency bands without disrupting ongoing communications, allowing for seamless switching between carriers based on quality indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single receiver chain is used to reduce device complexity, then the wireless terminal can maintain simpler hardware architecture, but communication disruptions occur when switching between carriers
Solution Approach 1:
The receiver is divided into multiple independent receiver chains (first receiver chain and second receiver chain), each capable of independently processing different carrier frequencies. This segmentation allows simultaneous monitoring of multiple carriers without requiring a single complex receiver to handle all frequencies sequentially, thus maintaining communication continuity while managing complexity through modular design.
Solution Approach 2:
The second receiver chain proactively monitors alternative carrier frequencies before the current carrier becomes unavailable. By performing preliminary evaluation of backup carriers in advance, the system can switch frequencies without disruption when the current carrier experiences fading or interference, preventing communication breaks before they occur.
2Adaptability or versatility
If the receiver interrupts communications to search for alternative carriers, then carrier selection can be evaluated, but normal communication sessions are disrupted during search intervals
Solution Approach 1:
While the first receiver chain maintains the current communication session without interruption, the second receiver chain continuously monitors alternative carrier frequencies in parallel. This continuous dual-operation approach ensures that carrier evaluation occurs without breaking the ongoing communication, maintaining both adaptability and productivity simultaneously.
Solution Approach 2:
The system performs preliminary carrier evaluation using the second receiver chain before any communication disruption occurs. By having the alternative carrier already evaluated and ready, the switch can execute immediately when needed, eliminating the need to interrupt communication for search operations.
3Adaptability or versatility
If the receiver retunes the RF filter for each search frequency, then alternative carriers can be evaluated, but time is expended for retuning and signal collection
Solution Approach 1:
The second receiver chain is configured in advance to monitor alternative carrier frequencies, eliminating the need for real-time retuning during carrier searches. By pre-positioning the receiver to capture signals from potential alternative carriers, the system avoids time-consuming retuning operations and can evaluate multiple carriers simultaneously.
Solution Approach 2:
The receiver architecture is segmented into multiple independent chains, each dedicated to specific frequency monitoring tasks. This segmentation allows parallel signal collection from multiple carriers without requiring sequential retuning of a single receiver, significantly reducing the time loss associated with frequency switching and signal evaluation.
4Measurement precision
If a single receiver chain monitors current carrier, then the receiver can focus on one frequency, but alternative carriers cannot be tracked simultaneously
Solution Approach 1:
The monitoring function is segmented across multiple receiver chains, with each chain dedicated to monitoring specific carrier frequencies. The first receiver chain maintains precise measurement of the current carrier while the second receiver chain simultaneously tracks alternative carriers, enabling both precise measurement and multi-carrier tracking without compromise.
Solution Approach 2:
The second receiver chain performs preliminary monitoring of alternative carriers in advance, maintaining continuous track of potential backup frequencies. This preliminary tracking ensures that when carrier switching is needed, the alternative carrier is already evaluated and ready, enabling seamless transitions while maintaining measurement precision on the active carrier.
Data Source
AI summary
Receivers accommodating frequency band selection methods in wireless communications systems are described. Different frequency bands are associated with different alternative carrier frequencies and/or base station cell and/or sector transmitter connection alternatives. Mobile node receivers include two receiver chains, each chain processing signals corresponding to a carrier. In some embodiments, each receiver chain includes its own controllable RF module, and individual carrier band selection is performed in each RF module. In some embodiments, the two receiver chains share a common RF module; however, each chain includes its own controllable baseband filter. In various embodiments, the first chain has higher complexity than the second chain. In most embodiments, each chain uses the same technology, e.g., spread spectrum OFDM or CDMA. Each chain obtains a quality indicator value on a different band and a comparison of quality indicator values is used in selecting the channel and carrier band for downlink traffic signaling.