Reverse-Link Control Signal Transmission Scheduling
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Solution Overview
Problem
The simultaneous transmission of multiple reverse-link control signals in a wireless communication system leads to undesirable interference on the reverse link, as all mobile devices within a coverage area typically transmit these signals at the same time across the full bandwidth, affecting the RAN's ability to accurately evaluate air-interface conditions and allocate resources effectively.
Innovation Solution
The RAN identifies a mobile device whose reverse-link control signal best represents the air-interface conditions of other devices and causes only this device to transmit its signal at a given time, while the other devices refrain from transmitting, thereby reducing interference and allowing the RAN to use the representative signal for resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all mobile devices transmit reverse-link control signals simultaneously at the same time, then each device can independently evaluate its own air-interface conditions, but the interference on the reverse link increases significantly
Solution Approach 1:
The patent segments the simultaneous transmission of reverse-link control signals by different mobile devices into separate time slots. Instead of all devices transmitting at once, the RAN schedules and segments their transmissions sequentially, thereby reducing interference while maintaining evaluation accuracy for each device.
Solution Approach 2:
The patent implements periodic transmission of reverse-link control signals where mobile devices transmit these signals at scheduled periodic intervals rather than simultaneously. The RAN coordinates these periodic transmissions to occur at different times, reducing interference while ensuring each device's air-interface conditions are evaluated.
2Productivity
If the RAN receives reverse-link control signals from multiple mobile devices simultaneously, then resource allocation can be performed for all devices, but the scheduling complexity and difficulty of evaluating air-interface conditions increase
Solution Approach 1:
The patent applies preliminary action by having the RAN pre-schedule and coordinate the transmission times of reverse-link control signals from different mobile devices before actual transmission occurs. This preliminary scheduling simplifies the subsequent resource allocation process by ensuring signals arrive in an organized, non-interfering sequence.
Solution Approach 2:
The patent uses feedback mechanisms where the RAN evaluates the reverse-link control signals received from mobile devices and uses this information to adjust future scheduling decisions. This feedback loop enables the RAN to optimize resource allocation while managing scheduling complexity based on actual air-interface conditions observed from each device.
3Loss of information
If mobile devices transmit reverse-link control signals across the full bandwidth, then comprehensive air-interface condition information is obtained, but the interference level on the reverse link increases
Solution Approach 1:
The patent segments both the time and frequency resources for reverse-link control signal transmissions. By dividing the full bandwidth into different resource blocks and assigning them to different devices at different times, the system maintains comprehensive air-interface condition information while reducing peak interference levels through temporal and spectral separation.
Data Source
AI summary
A method and system for dynamically controlling the transmission of reverse-link control signals to help reduce interference on the reverse link. A RAN identifies a mobile device whose transmission of reverse-link control signals best represents the reverse-link air interface condition of each other mobile device in a plurality of mobile devices. Then the RAN causes each mobile device in the plurality other than the identified mobile device to not send its respective reverse-link control signal at a given time, thereby reducing the number of mobile devices that transmit reverse-link control signals at the given time.