RU Uplink Power Mapping for Per-Device Wireless Geo-Location
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Solution Overview
Problem
In multi-radio distributed wireless communication systems, the simultaneous transmission of uplink communication signals by multiple user devices makes it difficult to distinguish which devices are responsible for specific uplink communication signals, leading to a loss of identity regarding downlink signal strength information, which hinders accurate geo-location determination.
Innovation Solution
User devices are scheduled to transmit uplink reference signals, such as sounding reference signals (SRS), at different times, allowing radio units (RUs) to measure power and time of arrival (TOA) of these signals, which are then used to create a user device report for geo-location determination based on differences in power and TOA across multiple RUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple user devices transmit uplink communication signals simultaneously, then system productivity is improved, but measurement precision of individual device geo-location deteriorates
Solution Approach 1:
The patent segments the uplink signal transmission by assigning different time slots to different user devices. Each user device transmits its uplink reference signal in a dedicated time slot, which segments the overall transmission into distinct temporal portions. This allows the base station to measure uplink power for each device separately without interference from other devices, thereby maintaining geo-location accuracy while supporting multiple users.
Solution Approach 2:
The patent implements periodic transmission of uplink reference signals by user devices in scheduled time slots. Each user device periodically transmits reference signals at predetermined intervals, creating a structured temporal pattern. This periodic action enables the base station to consistently measure uplink power at specific time points, ensuring accurate geo-location determination while maintaining continuous system operation.
2Measurement precision
If uplink reference signals are transmitted at different times for each user device, then geo-location accuracy is improved, but loss of time for system operation increases
Solution Approach 1:
The patent applies preliminary action by pre-scheduling time slots for uplink reference signal transmissions before actual geo-location measurement is needed. The base station configures and communicates the time slot allocation to user devices in advance, allowing devices to prepare and transmit at the predetermined times. This eliminates the need for real-time scheduling decisions and reduces measurement delays.
Solution Approach 2:
The patent maintains continuity of useful action by overlapping reference signal transmission time slots with normal data transmission activities. The scheduled reference signal transmissions are integrated into the ongoing system operation rather than being separate interruptive events. This allows the system to continuously perform both data communication and geo-location measurement without significant idle time.
Data Source
AI summary
Determining geo-location of user devices in a multi-radio distributed wireless communication system (WCS) using measured uplink power in radio units (RUs) on a per user device basis is disclosed. Active user devices in the WCS are scheduled to transmit an uplink reference signal (e.g., a sounding reference signal (SRS)) at different times so that uplink power in the uplink reference signal received by multiple RUs can be analyzed on a per user device basis. The measured uplink power of a received uplink reference signal in each RU can be measured in the time domain before any combining of uplink communication signals and then reported to create a user device report. The user device report includes the measured uplink power in multiple RUs that each received the uplink reference signal transmitted by the scheduled remote unit that can be analyzed to determine the geo-location of the user device within the WCS.