Uplink On-Off Patterns for Unlicensed Band Frequency Hopping
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing uplink transmissions in shared radio frequency bands, particularly in unlicensed spectra, due to the need for listen-before-talk (LBT) procedures, which increase processing complexity and power consumption, and lack flexibility in scheduling.
Innovation Solution
Implementing uplink transmission on-off patterns and frequency-hopping techniques that allow devices to transmit without LBT by configuring multiple offset patterns and dynamically switching between them, enabling efficient resource usage and reduced overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If listen-before-talk (LBT) procedures are implemented in unlicensed bands, then channel access reliability is improved, but processing complexity and power consumption increase
Solution Approach 1:
The patent segments the unlicensed spectrum into multiple frequency channels and implements frequency hopping across these channels. By dividing the spectrum access into multiple frequency segments rather than continuous monitoring, the LBT procedure complexity is reduced while maintaining reliable channel access through distributed frequency sampling.
Solution Approach 2:
The patent implements periodic frequency hopping patterns where the transmitter systematically switches between predefined frequency channels at regular intervals. This periodic action allows the system to access multiple frequency resources over time, reducing the need for continuous LBT monitoring on a single channel and thereby lowering processing complexity while maintaining access reliability.
2Reliability
If listen-before-talk (LBT) procedures are implemented in unlicensed bands, then channel access reliability is improved, but power consumption increases
Solution Approach 1:
By segmenting the LBT process across multiple frequency channels through frequency hopping, the patent reduces the time and energy required for channel assessment on each individual channel. The transmitter performs brief LBT checks on multiple channels rather than prolonged monitoring on one channel, thereby reducing overall power consumption while maintaining access reliability.
Solution Approach 2:
The patent establishes a predefined frequency hopping sequence and channel access pattern in advance. This preliminary configuration allows the transmitter to follow a predetermined efficient path through the frequency spectrum, avoiding ad-hoc decision-making and reducing the computational energy required during actual transmission operations.
3Adaptability or versatility
If multiple uplink transmission on-off patterns are configured with time offsets, then scheduling flexibility is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic switching between multiple uplink transmission on-off patterns based on real-time scheduling requirements. By allowing the system to dynamically select and switch between predefined patterns with different time offsets, it achieves scheduling flexibility without permanently maintaining all pattern configurations simultaneously, thereby managing device complexity through time-multiplexed pattern activation.
Solution Approach 2:
The patent pre-configures multiple uplink transmission on-off patterns with different time offsets in advance, storing them as predefined templates. This preliminary configuration allows the system to quickly switch between patterns based on scheduling needs without performing complex real-time calculations, reducing the computational burden and device complexity during operation.
4Productivity
If frequency-hopping techniques are used in unlicensed bands, then resource utilization efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple discrete hopping channels and implements systematic frequency switching between these segments. By organizing frequency resources into predefined segments with clear hopping rules, the system achieves efficient resource utilization through frequency diversity while managing device complexity through structured rather than random frequency selection.
Data Source
AI summary
Wireless communications systems and methods related to uplink communications with transmission on-off patterns and frequency-hopping in a shared radio frequency band are provided. A first wireless communication device communicates, with a second wireless communication device, a configuration indicating a plurality of uplink (UL) transmission on-off patterns that are offset from each other in time. The first wireless communication device communicates, with the second wireless communication device in an unlicensed band, a first UL communication signal based on a first UL transmission on-off pattern of the plurality of UL transmission on-off patterns.