Co-scheduled UE Interference Signaling via Zero Power Resource Elements
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Solution Overview
Problem
In multi-user multiple input multiple output (MU-MMIMO) operations, detecting the modulation order of co-scheduled user equipment (UEs) is challenging due to interference and limited information provided by network nodes.
Innovation Solution
The system receives a configuration for resource elements with zero power from a network node and downlink control information with an aperiodic indication. Based on this information, the system determines the number of co-scheduled UEs in a physical downlink shared channel, using indices, number of resource elements, or number of elements triggered by the aperiodic indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If blind detection is performed for modulation order of co-scheduled UEs, then detection capability is improved, but detection accuracy deteriorates due to interference and limited information
Solution Approach 1:
The network node performs preliminary actions by configuring resource elements with zero power and providing aperiodic indications before the UE performs detection. This preliminary signaling provides the UE with advance information about the number of co-scheduled UEs and their modulation orders, enabling more accurate detection without relying solely on blind detection methods
Solution Approach 2:
Resource elements with zero power act as an intermediary mechanism between the network node and the UE. These specialized resource elements carry implicit information about co-scheduled UEs that the UE can detect, serving as a mediator that bridges the information gap without requiring direct signaling of modulation orders
2Loss of information
If network assisted signaling is provided, then information availability is improved, but signaling overhead increases
Solution Approach 1:
The invention changes the parameter representation by using resource element configurations (indices and counts) to indirectly indicate modulation orders and UE counts. Instead of directly signaling modulation order values, the system uses configurable parameters like the number of resource elements with zero power and their indices, which convey the same information more efficiently
Solution Approach 2:
The system uses copies of resource element patterns and configurations to convey information about multiple co-scheduled UEs. By configuring and indicating resource element sets that correspond to different UE scenarios, the system efficiently communicates modulation order information without requiring separate explicit signaling for each UE
Data Source
AI summary
An apparatus configured to: receive, from a network node, a configuration for one or more resource elements having zero power; receive downlink control information, wherein the downlink control information comprises, at least, an aperiodic indication for triggering resource elements having zero power; and determine a number of co-scheduled user equipments in a physical downlink shared channel based, at least partially, on at least one of: an index associated with the one or more resource elements, a number of the one or more resource elements, or a number of the one or more resource elements triggered with the aperiodic indication; and identify co-scheduled-UE interferer information based on the number of co-scheduled-UEs and the resource elements having zero power. The co-scheduled-UE interferer information includes determination of the MO, FDRA and DMRS ports of each co-scheduled UE.