DMRS Port Scheduling via Co-Scheduled UE Indicators
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Solution Overview
Problem
In wireless communication systems, co-scheduling of demodulation reference signals (DMRS) for multiple users in MIMO communications introduces interference, complicating channel estimation and decoding, and existing methods lack effective indicators for co-scheduled users.
Innovation Solution
The method involves transmitting signaling that schedules shared channels and indicates sets of DMRS ports, including fields for conveying indicators of co-scheduled users, allowing target UEs to improve channel estimation by accounting for co-scheduled UEs through orthogonal cover codes and resource block allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If co-scheduling of DMRS for multiple users is implemented to improve resource utilization, then system productivity increases, but interference between users increases and channel estimation accuracy deteriorates
Solution Approach 1:
The patent introduces an intermediary field in DCI signaling that carries indicators of co-scheduled UEs and their resource allocations. This intermediary information acts as a mediator that enables the target UE to identify and compensate for interference from co-scheduled users, thereby maintaining channel estimation accuracy while allowing co-scheduling to proceed for improved resource utilization.
Solution Approach 2:
The patent applies preliminary anti-action by providing the target UE with advance information about co-scheduled UEs through DCI signaling. This allows the UE to pre-compensate for expected interference from other users before channel estimation is performed, counteracting the harmful interference effects before they degrade estimation accuracy.
2Productivity
If co-scheduling is implemented to increase system capacity, then productivity improves, but device complexity increases due to additional interference management requirements
Solution Approach 1:
The DCI signaling field acts as an intermediary that simplifies the interference management process. Instead of requiring complex blind detection and interference analysis at the UE, the network provides structured indicator information about co-scheduled UEs, reducing the computational complexity at the device while enabling multi-user scheduling.
3Measurement precision
If indicators of co-scheduled UEs are added to signaling to improve channel estimation, then measurement precision improves, but signaling overhead increases
Solution Approach 1:
The patent uses parameter changes by encoding co-scheduled UE information in a compact format within existing DCI signaling structures. By efficiently representing interference information through optimized parameter encoding, the signaling overhead is minimized while still providing sufficient information for accurate channel estimation and interference compensation.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive signaling that schedules a shared channel and indicates a set of demodulation reference signal (DMRS) ports scheduled for the UE, the signaling including a field for conveying an indicator of a co-scheduled UE for the set of DMRS ports. The UE may communicate a set of DMRSs based at least in part on the signaling. Numerous other aspects are described.