Antenna Port Selection Using Offset Adjustments
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently selecting the optimal downlink transmit antenna port for user equipment, particularly in multi-beam operations, as existing methods do not effectively account for varying conditions and interference levels, leading to suboptimal random access latency and system capacity.
Innovation Solution
The method involves receiving reference signals from multiple downlink transmit antenna ports, determining measurable characteristics, and applying specific offset values to select the best serving antenna port based on adjusted values, which are transmitted by the network entity to the user equipment for optimal beam selection and random access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional antenna port selection methods are used without antenna port specific adjustments, then the device complexity is lower, but the random access latency increases and system capacity deteriorates
Solution Approach 1:
The network entity pre-calculates and provides antenna port specific adjustments (offset values) to the user equipment before the antenna port selection process. This allows the UE to make informed selection decisions without performing complex real-time calculations, thereby reducing random access latency while maintaining manageable device complexity.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network entity provides adjustment parameters that mediate between the raw reference signal measurements and the final antenna port selection. These offset values act as intermediaries that guide the UE's selection process, reducing the computational burden on the device while improving selection accuracy and reducing latency.
2Productivity
If antenna port specific adjustments are implemented, then the system capacity improves, but the device complexity increases due to additional parameters and calculations
Solution Approach 1:
The network entity pre-computes the antenna port specific adjustments based on network conditions and provides them to the UE in advance. This preliminary action allows the system to achieve improved capacity through sophisticated parameter adjustments without requiring the UE to perform complex real-time calculations, thus managing device complexity effectively.
Solution Approach 2:
The network entity performs the complex calculation and optimization work itself by determining the appropriate offset values for each antenna port. The UE then simply applies these pre-determined adjustments to its measurements, allowing the system to benefit from enhanced capacity optimization while the UE maintains relatively simple processing requirements.
3Measurement precision
If offset values are applied to reference signal measurements, then the accuracy of antenna port selection improves, but the loss of information increases due to additional parameter transmission
Solution Approach 1:
The patent modifies the measurement parameters by introducing antenna port specific offset values that adjust the reference signal measurements. These parameter changes enable more accurate antenna port selection by compensating for variations in transmission conditions. The offset values are efficiently transmitted as compact numerical parameters, minimizing information overhead while significantly improving measurement precision.
Data Source
AI summary
A method and apparatus is provided, where a respective reference signal associated with each of one or more downlink transmit antenna ports in a wireless communication network is received. A value is determined for each of one or more measurable characteristics relative to each of the received reference signals. One or more parameters are received, the parameters including one or more adjustments, where each adjustment is specific to one of the downlink transmit antenna ports and include adjustments in the form of one or more respective offset values to be applied to at least some of the one or more determined values of the measurable characteristics of the received reference signals. At least one downlink transmit antenna port is then to function as a serving downlink transmit antenna port for the user equipment, based upon a comparison of the resulting values of the measurable characteristics of the received reference signals after the received one or more adjustments have been applied to the corresponding determined values.