Baseband Unit Terminal Positioning via Uplink Signal Selection
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Solution Overview
Problem
Current indoor positioning methods in mobile communications, such as those using GPS and indoor distributed NodeB systems, face challenges like increased terminal power consumption, long positioning measurement periods, and high network load, especially in dense scenarios, due to the need for frequent signal exchanges and modifications to existing cellular communication protocols.
Innovation Solution
A terminal positioning method that selects target RRUs based on uplink positioning signals in an existing indoor coverage system, performing positioning calculations on the network side, which reduces terminal power consumption and network load by allowing calculations to be performed once, using signal angles of arrival and preset algorithms to determine the terminal's location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If positioning calculation is performed on the terminal side, then positioning function is achieved, but terminal power consumption increases
Solution Approach 1:
The patent introduces a baseband unit as an intermediary that performs positioning calculations on the network side rather than on the terminal. The baseband unit receives uplink positioning signals from multiple RRUs, performs the computational operations, and returns positioning results to the terminal, thereby achieving positioning functionality while relieving the terminal of heavy computational burden and reducing its power consumption.
2Reliability
If PRSs are sent at intervals to distinguish different RRUs, then positioning measurement is enabled, but positioning measurement period becomes long, affecting data communication efficiency
Solution Approach 1:
The patent replaces the mechanical time-based differentiation method (sending PRSs at intervals) with a signal processing-based approach. Different RRUs send PRSs simultaneously but with different scrambling codes or cyclic shifts, allowing the baseband unit to distinguish and process signals from different RRUs concurrently through code division multiplexing, thereby eliminating the need for sequential measurement and improving data communication efficiency.
3Area of stationary object
If a large quantity of positioning signals are exchanged in dense scenarios, then positioning coverage is improved, but network load increases and normal data service is interrupted
Solution Approach 1:
The patent merges positioning signal processing with existing uplink data transmission resources. Instead of establishing separate dedicated positioning signal channels, the system utilizes existing uplink resource blocks for positioning signal transmission, allowing positioning measurements to be performed using resources already allocated for data communication, thereby improving positioning coverage without significantly increasing network load or interrupting normal data services.
Data Source
AI summary
The present disclosure describes methods, terminals, and base stations for terminal positioning method. One example method applied to a baseband unit (BBU) in an indoor distributed NodeB system includes: receiving an uplink positioning signal forwarded by multiple remote radio units RRUs, where the uplink positioning signal is sent by a to-be-positioned terminal to the multiple RRUs; selecting, from the multiple RRUs, at least two RRUs as target RRUs according to the uplink positioning signal and a preset rule; and respectively obtaining signal angles of arrival corresponding to the target RRUs, and determining a location of the to-be-positioned terminal according to the signal angles of arrival, locations of the target RRUs, and a preset algorithm.