Feedback-Based Frequency Hopping for Wireless Communication Efficiency
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Solution Overview
Problem
In short-range wireless communication, devices perform blind frequency hopping without channel quality indication, leading to wasted air time, increased power consumption, and reduced communication efficiency due to unnecessary retransmissions.
Innovation Solution
A processor in user equipment tunes a transceiver to a first frequency, transmits a short packet to a secondary device, and determines if the channel meets predetermined criteria before transmitting primary data, thereby avoiding blind frequency hopping and retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If blind frequency hopping is performed without channel quality indication, then device complexity is reduced, but communication efficiency deteriorates due to wasted air time and unnecessary retransmissions
Solution Approach 1:
The patent implements a feedback mechanism where the receiving device sends channel quality indicators (CQI) back to the transmitting device. This feedback allows the transmitter to make informed frequency hopping decisions based on actual channel conditions, resolving the contradiction by adding minimal feedback overhead to significantly improve communication efficiency without requiring full-blown channel assessment protocols.
Solution Approach 2:
The patent performs preliminary channel quality assessment by transmitting probe packets before actual data transmission. This preliminary action allows the system to identify suitable frequencies in advance, avoiding wasted retransmissions during actual data transfer while maintaining relatively simple protocol structure.
2Ease of operation
If blind frequency hopping is performed without channel quality indication, then ease of operation is improved, but loss of time increases due to wasted air time and retransmissions
Solution Approach 1:
Channel quality feedback from the receiving device enables the transmitting device to select optimal frequencies without extensive probing, reducing air time wastage while maintaining ease of operation. The feedback mechanism provides just enough information to make quick, informed decisions.
Solution Approach 2:
By performing preliminary channel assessment using probe packets before actual data transmission, the system identifies suitable frequencies in advance. This preliminary action minimizes air time wastage during actual data transfer while keeping the operation simple and automated.
3Device complexity
If blind frequency hopping is performed without channel quality indication, then device complexity is reduced, but use of energy increases due to unnecessary retransmissions
Solution Approach 1:
The feedback mechanism provides channel quality information that enables energy-efficient frequency selection. By knowing which frequencies are suitable, the device avoids repeated transmissions on poor channels, significantly reducing power consumption without requiring complex channel assessment hardware or protocols.
Solution Approach 2:
Preliminary channel assessment using lightweight probe packets consumes minimal energy compared to repeated full-data retransmissions. This preliminary action identifies good frequencies in advance, preventing energy-wasting retransmissions while keeping the assessment mechanism simple.
4Productivity
If channel quality indication is implemented before data transmission, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements preliminary channel assessment using simple probe packets transmitted before actual data. This preliminary action provides sufficient channel quality information to improve communication efficiency without requiring complex continuous monitoring or assessment systems during data transfer.
Solution Approach 2:
Instead of implementing full continuous channel assessment, the patent uses partial assessment through probe packets at key moments (before transmission, after interruptions). This partial action provides enough information to improve efficiency without the overhead of complete continuous monitoring systems.
Data Source
AI summary
A user equipment (UE) tunes a transceiver of the UE to a first frequency associated with a first channel, transmits a first short packet to a second UE on the first channel and determines whether a first indication was received from the second UE in response to the first short packet. The first indication indicates that the first channel satisfies one or more predetermined criteria. The UE transmits then the primary data to the second UE on the first channel in response to the first indication being received from the second UE.