Multicast Downlink Grant for CSI Reporting in 5G NR
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in channel state information (CSI) reporting for 5G new radio (NR) multicast, particularly in reducing network overhead and latency by minimizing downlink transmissions to groups of user equipment (UEs).
Innovation Solution
The system employs a multicast downlink grant to trigger channel measurements in UEs, allowing them to measure and report CSI based on received reference signals, thereby reducing the need for individual uplink grants and optimizing network resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual uplink grants are transmitted to each UE for CSI reporting, then channel measurement accuracy is improved, but network overhead increases
Solution Approach 1:
The patent combines multiple individual uplink grants into a single group uplink grant that triggers CSI reporting from multiple UEs simultaneously. This merging approach maintains the measurement accuracy function while reducing the quantity of downlink control information transmitted, directly resolving the contradiction between measurement precision and network overhead.
Solution Approach 2:
The group uplink grant is designed to serve multiple UEs universally, performing the function of triggering CSI reports from multiple user equipments with a single transmission. This multi-functional approach allows the system to maintain accurate channel state information collection across multiple UEs while minimizing the overhead of individual grant transmissions.
2Loss of information
If individual uplink grants are transmitted to each UE for CSI reporting, then channel state information collection is improved, but latency increases
Solution Approach 1:
By merging individual uplink grant transmissions into a single group uplink grant, the patent reduces the time required to trigger CSI reporting across multiple UEs. This simultaneous triggering mechanism eliminates sequential delays, maintaining comprehensive channel state information collection while significantly reducing the overall latency.
Solution Approach 2:
The group uplink grant is configured in advance to trigger CSI reporting from multiple UEs simultaneously, allowing the system to prepare and execute channel state information collection in a coordinated manner. This preliminary configuration enables efficient time-synchronized reporting, reducing the latency associated with individual sequential grant transmissions.
3Reliability
If multiple downlink transmissions are sent to UEs for multicast, then delivery reliability is improved, but network overhead increases
Solution Approach 1:
The patent merges multiple downlink grant transmissions into a single multicast downlink grant that is transmitted once to a group of UEs. This approach maintains delivery reliability by ensuring all group members receive the grant simultaneously, while reducing network overhead by eliminating redundant transmissions of the same grant information to multiple UEs.
Solution Approach 2:
The multicast downlink grant is designed to serve multiple UEs universally within a group, performing the function of scheduling and triggering CSI reporting for all group members with a single transmission. This multi-functional approach ensures reliable delivery to multiple UEs while minimizing the quantity of downlink transmissions required.
Data Source
AI summary
A method of wireless communication performed by a user equipment (UE) includes receiving, from a base station, a message comprising a multicast downlink grant for a downlink channel associated with a multicast transmission. The method also includes receiving, from the base station, a reference signal associated with the downlink channel. The method further includes transmitting, to the base station, a unicast message comprising a measurement report indicating a measurement of the reference signal associated with the downlink channel. The reference signal may be measured based on receiving the multicast downlink grant.