Antenna Port Segmentation for CSI Reporting
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Solution Overview
Problem
Existing communication methods in LTE networks with 2D antenna arrays lead to energy consumption and complexity issues at network nodes and wireless devices due to unnecessary measurements and transmissions, resulting in resource wastage and degraded channel efficiency.
Innovation Solution
A method where a network node indicates different sets of antenna ports to a wireless device for periodic and aperiodic channel state information (CSI) reporting, allowing the device to configure itself for measurements using fewer ports for periodic reporting, thereby reducing energy consumption and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wireless device performs measurements on all antenna ports in a 2D antenna array, then the channel state information accuracy is improved, but the energy consumption and device complexity increase
Solution Approach 1:
The patent segments the antenna ports into two distinct sets: a first set of antenna ports for periodic CSI reporting and a second set of antenna ports for aperiodic CSI reporting. This segmentation allows the wireless device to perform measurements selectively on different port sets depending on the reporting type, rather than continuously measuring all ports, thereby reducing energy consumption while maintaining measurement accuracy when needed.
Solution Approach 2:
The patent introduces dynamic configuration where the network node can indicate different sets of antenna ports based on reporting requirements. The wireless device dynamically adjusts its measurement behavior by configuring itself with the indicated port sets, switching between measuring all ports (for aperiodic reporting) and measuring only a subset (for periodic reporting), thus optimizing energy usage according to actual channel state information needs.
2Measurement precision
If the wireless device performs measurements on all antenna ports, then the channel state information accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent segments the antenna ports into two distinct sets: a first set of antenna ports for periodic CSI reporting and a second set of antenna ports for aperiodic CSI reporting. This segmentation allows the wireless device to perform measurements selectively on different port sets depending on the reporting type, rather than continuously measuring all ports, thereby reducing energy consumption while maintaining measurement accuracy when needed.
Solution Approach 2:
The patent introduces dynamic configuration where the network node can indicate different sets of antenna ports based on reporting requirements. The wireless device dynamically adjusts its measurement behavior by configuring itself with the indicated port sets, switching between measuring all ports (for aperiodic reporting) and measuring only a subset (for periodic reporting), thus optimizing energy usage according to actual channel state information needs.
3Measurement precision
If the network node transmits reference signals on all antenna ports periodically, then the channel state information accuracy is improved, but the resource wastage increases
Solution Approach 1:
The patent segments the antenna ports into two distinct sets: a first set of antenna ports for periodic CSI reporting and a second set of antenna ports for aperiodic CSI reporting. This segmentation allows the wireless device to perform measurements selectively on different port sets depending on the reporting type, rather than continuously measuring all ports, thereby reducing energy consumption while maintaining measurement accuracy when needed.
Solution Approach 2:
The patent implements different measurement configurations for periodic and aperiodic reporting. For periodic reporting, the wireless device measures only the first set of antenna ports at regular intervals, while for aperiodic reporting triggered by network events, it measures the second set of antenna ports. This periodic action principle reduces resource wastage by avoiding continuous full-array measurements while maintaining channel state information accuracy when actually needed.
Data Source
AI summary
Method performed by a network node (210) to indicate a first and a second set of antenna ports. The network node (210) indicates (803) to a wireless device (250) at least one of: a) a first indication of a first set (M′) of antenna ports for first measurements on first radio signals, the first measurements associated with periodic reporting, and b) a second indication of a second set (M) of antenna ports for second measurements on second radio signals, the second measurements associated with aperiodic reporting. The first set is different than the second set. The periodic and the aperiodic reporting are by the wireless device (250) and correspond to a same Channel State Information, CSI, process. The network node (210) also transmits (804), to the wireless device (250), the first radio signals, periodically, over the first set and the second radio signals over the second set.