Transceiver CSI Status Indicator for Massive MIMO Resource Optimization
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Solution Overview
Problem
Conventional CSI reporting methods are inefficient and resource-intensive, especially in Massive MIMO systems with a large number of antennas, as they require significant downlink and uplink resources for explicit CSI reports, and are not well-suited for explicit CSI reporting.
Innovation Solution
A transceiver generates and transmits a CSI status indicator to indicate the need for a beamforming matrix update, allowing for efficient resource allocation and reduced reporting costs by indicating when a new CSI report is available or when previously reported CSI is outdated, enabling the second transceiver to request and transmit CSI reports only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit CSI reports are transmitted in Massive MIMO systems, then channel state information accuracy is improved, but downlink and uplink resource consumption increases
Solution Approach 1:
The patent extracts only the essential CSI status information (whether a new CSI report is available or previous CSI is outdated) from the full CSI report, transmitting this condensed status indicator instead of the complete CSI data. This extraction principle reduces uplink resource consumption while maintaining the ability to obtain accurate CSI when needed by the network side.
Solution Approach 2:
The patent transmits partial CSI information (status indicator) rather than the complete CSI report continuously. The network side can request full CSI reports selectively based on the status indicator, implementing partial action that reduces resource consumption while maintaining measurement precision when required.
2Reliability
If periodic CSI reports are transmitted, then channel state information is continuously updated, but uplink resource usage increases
Solution Approach 1:
The patent implements periodic transmission of compact CSI status indicators instead of periodic full CSI reports. The network side can configure the periodicity of these status indicator transmissions, allowing flexible balance between CSI freshness and resource consumption. Full CSI reports are transmitted only when triggered by the network based on the status indicator.
Solution Approach 2:
The transmitting side autonomously monitors its own CSI status and generates status indicators indicating when new CSI reports are available or when previous CSI is outdated. This self-service mechanism eliminates the need for continuous network-side requests and reduces uplink resource usage while maintaining reliability.
3Productivity
If full-dimension beamforming matrix determination is performed, then beamforming performance is improved, but computational cost increases
Solution Approach 1:
The transmitting side performs preliminary determination of full-dimension beamforming matrices and generates status indicators in advance, indicating when beamforming matrix updates are needed. This preliminary action allows the network side to request updated CSI reports only when necessary, reducing overall computational cost while maintaining beamforming performance when required.
Data Source
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Figure 3A~3B
AI summary
In one aspect of this disclosure, a transceiver obtains and transmits a CSI status indicator. In one example, the CSI status indicator indicates that previously reported CSI is outdated and/or that a new CSI report is available at the transceiver. In some embodiments, the transceiver generates or transmits the CSI status indicator according to a particular configuration, which may be set by a supporting wireless communication network. The configuration may include criteria on when to transmit the CSI status indicator, such as configuration criteria indicating that the transceiver should transmit the CSI status indicator responsive to completing its determination of a full-dimension beamforming matrix to be used for controlling beamforming towards the transceiver. The transceiver comprises, for example, a wireless device operating within a wireless communication network and the CSI status indicator corresponds to the status of downlink CSI.