Base Station AoA Candidate Reporting for Ambiguous Angle Resolution
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the angle of arrival (AoA) of signals to locate moving user equipment (UE) due to limitations in measuring and reporting AoA data effectively.
Innovation Solution
An electronic device, such as a base station, equipped with multiple antennas, obtains AoA measurements and transmits them to a location management server through a transceiver, along with candidate AoAs identified based on the interval between antennas, enabling precise AoA determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If only a single AoA measurement is transmitted to the location management server, then the signaling overhead is reduced, but the positioning accuracy deteriorates due to inability to resolve angle ambiguity
Solution Approach 1:
The patent extracts only the necessary candidate AoA values from the full set of possible AoA measurements. Instead of transmitting all possible AoA values, the system identifies and transmits only those candidate AoA values that are most likely to be the actual angle of arrival, based on the antenna interval and signal characteristics. This reduces the amount of data transmitted while maintaining sufficient information for accurate positioning.
Solution Approach 2:
The patent changes the parameter being transmitted from a single AoA value to a selective set of candidate AoA values. By modifying what information is transmitted (from one value to multiple selected values), the system resolves the contradiction between reducing signaling overhead and maintaining positioning accuracy. The location management server can then select the most accurate candidate from the transmitted set.
2Measurement precision
If multiple candidate AoAs are transmitted to resolve angle ambiguity, then the positioning accuracy is improved, but the signaling overhead increases
Solution Approach 1:
The patent applies partial action by transmitting only a subset of candidate AoA values rather than all possible values. The system identifies the minimum necessary number of candidate AoA values required to resolve angle ambiguity and transmits only those. This partial transmission approach maintains positioning accuracy while minimizing signaling overhead, avoiding the excessive transmission of all possible AoA measurements.
3Measurement precision
If the antenna interval is increased to improve AoA measurement resolution, then the measurement precision is improved, but the angle ambiguity increases leading to more candidate AoAs that must be transmitted
Solution Approach 1:
The patent uses feedback by having the base station transmit information about the antenna interval configuration to the location management server. This allows the server to understand the specific antenna geometry and adjust its candidate AoA selection process accordingly. The feedback mechanism enables the server to resolve angle ambiguity more effectively by knowing the exact antenna spacing, thereby reducing the number of candidate AoAs that need to be transmitted and processed.
Data Source
AI summary
An apparatus of a base station is provided. The apparatus includes memory for storing instructions, at least one transceiver, and at least one processor communicatively coupled to the at least one transceiver and the memory, wherein the instructions, when executed by the at least one processor individually or collectively, cause the apparatus to: obtain signals received from a terminal through a plurality of antennas, obtain a first angle of arrival (AoAs) for a first direction of the plurality of antennas based on the signals, and transmit, to a location management server through the at least one transceiver, a measurement message including the first AoA and at least one first candidate AoA associated with the first AoAs, wherein the at least one first candidate AoA is identified based on the first AoA and a first interval between antennas disposed along the first direction.