Antenna Port Count Adjustment for Wireless Coherence
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Solution Overview
Problem
In wireless telecommunication systems, especially those using multiple antennas, channel estimation becomes less accurate over time due to changing channel conditions, leading to poor Quality of Service (QoS) and increased control signaling and processing requirements, as the coherence interval shortens, necessitating frequent channel updates.
Innovation Solution
A method to dynamically adjust the number of antenna ports used in communications based on a balance between performance metrics related to coherence interval, such as data rate, error rate, power consumption, and control signaling load, to maintain effective channel stability and reduce the need for frequent channel updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of antenna ports is increased to improve data rate and channel estimation accuracy, then the coherence interval decreases, requiring more frequent channel updates and increasing control signaling load
Solution Approach 1:
The system dynamically adjusts the number of antenna ports based on channel conditions, receiver capabilities, and coherence interval measurements. The transmitting node can switch between different antenna port configurations (e.g., full MIMO, reduced MIMO, or beamforming modes) to optimize the trade-off between channel estimation accuracy and control signaling overhead in real-time
Solution Approach 2:
The patent changes the parameter of antenna port count adaptively rather than using a fixed configuration. By modifying this key parameter based on channel coherence measurements and performance metrics, the system achieves variable channel estimation precision that matches actual channel stability, reducing unnecessary control signaling during stable periods while maintaining accuracy during rapid channel changes
2Productivity
If the number of antenna ports is increased to improve data rate, then power consumption increases due to more frequent channel estimation and processing requirements
Solution Approach 1:
The system implements dynamic antenna port selection that adapts to channel conditions and receiver mobility. When channel conditions are stable or receiver mobility is low, the system reduces the number of active antenna ports, thereby lowering the frequency of channel estimation operations and reducing power consumption while maintaining adequate data rates
Solution Approach 2:
The patent dynamically changes the antenna port configuration parameter based on measured channel coherence and performance metrics. This parameter adjustment allows the system to optimize the balance between data rate and power consumption by using fewer antenna ports when high data rates are not critical or when channel conditions permit reduced estimation frequency
3Reliability
If channel estimation is performed frequently to maintain accuracy in changing channel conditions, then the coherence interval is reduced, increasing processing requirements at both transmitter and receiver
Solution Approach 1:
The system employs feedback mechanisms where the receiver measures channel coherence and reports back to the transmitter. Based on this feedback, the transmitter adjusts the channel estimation frequency and antenna port configuration, creating a closed-loop system that maintains QoS while optimizing processing requirements by avoiding unnecessary frequent estimations
Solution Approach 2:
The patent applies partial channel estimation by using a reduced set of antenna ports or reference signals when full channel estimation is not necessary. This partial action approach maintains adequate QoS for many scenarios while significantly reducing the processing burden at both transmitter and receiver by performing only the necessary subset of estimation operations
Data Source
AI summary
A method and a controller for controlling a transmitting node in a wireless telecommunications network, the wireless telecommunications network including a receiving node, wherein the transmitting node includes a plurality of antenna ports, the method including determining a count of antenna ports, being one or more of the transmitting node's plurality of antenna ports, to use in communications with the receiving node based on: a balance between a first performance metric related to a coherence interval and having a positive relationship with the count of antenna ports and a second performance metric related to the coherence interval and having a negative relationship with the count of antenna ports, and/or a measure of the coherence interval in communications with the receiving node; and causing the transmitting node to use the count of antenna ports in communications with the receiving node.