Dynamic Multi-Panel Uplink Precoding for 5G Scheduling
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Solution Overview
Problem
Current 5G wireless communication systems face inefficiencies in multi-panel user equipment (UE) due to limited coherent combining capabilities, resulting in underutilization of panels during sounding reference signal (SRS) transmission and configured grant physical uplink shared channel (PUSCH) transmissions, which can lead to spatial interference and reduced diversity gains.
Innovation Solution
The proposed solution involves dynamic configuration of multiple sounding reference signal (SRS) resource indicators (SRIs), transmit precoding matrix indicators (TPMIs), and antenna ports during configured grant PUSCH transmissions, allowing for enhanced multi-panel uplink (UL) multiple input multiple output (MIMO) transmission by enabling the use of various resource combinations for both initial and retransmission phases, with new interpretation rules and DCI formats to support flexible switching of resource parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If only a single TPMI with a single associated SRI is configured for configured grant PUSCH transmission, then the device complexity is reduced and the operation is simplified, but the spectral efficiency is reduced and spatial diversity is lost due to underutilization of panels
Solution Approach 1:
The patent applies dynamics by transitioning from a static single-TPMI configuration to a dynamic multi-TPMI configuration. The network can dynamically indicate different TPMIs and SRIs for different panels during PUSCH transmission, allowing the system to adaptively utilize multiple panels based on channel conditions while maintaining operational simplicity through network-controlled switching.
Solution Approach 2:
The patent segments the uplink transmission into multiple panel-specific resource combinations, each associated with a specific TPMI-SRI pair. This segmentation allows independent configuration and activation of different panel combinations, enabling the system to activate only the necessary panels for optimal performance while maintaining overall system simplicity.
2Adaptability or versatility
If multiple panels are configured for SRS transmission but coherent combining capability is not supported, then the device complexity is increased, but the spatial diversity and diversity gains are reduced due to inability to coherently combine panels
Solution Approach 1:
The patent applies local quality by treating each panel independently with its own TPMI-SRI configuration. Instead of requiring coherent combining across all panels, the system configures different precoding matrices and SRS resources for different panels based on their individual channel conditions, maximizing local performance while avoiding the complexity of coherent combining.
Solution Approach 2:
The patent changes the parameters (TPMI and SRI) independently for each panel configuration. By allowing different TPMIs and SRIs to be configured for different panels, the system can adapt each panel's transmission parameters to its specific channel conditions without requiring coherent combining, thus maintaining spatial diversity gains while reducing system complexity.
3Device complexity
If panels are not dynamically activated for retransmission based on DCI indication, then the device complexity is reduced, but the loss of time increases due to inability to optimize retransmission resources dynamically
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TPMI-SRI resource combinations in the UE before retransmission occurs. When a retransmission is needed, the UE can quickly select from the pre-configured combinations based on the DCI indication, avoiding the need for complex real-time configuration and reducing retransmission latency.
Solution Approach 2:
The patent implements feedback through the DCI mechanism, where the network indicates which TPMI-SRI combination should be used for retransmission based on channel conditions. This feedback loop allows the system to dynamically optimize retransmission parameters while maintaining low complexity through network-controlled selection from pre-configured options.
Data Source
AI summary
In conventional wireless communication systems, only a single transmit precoding matrix indicator (TPMI) with a single associated sounding reference signal (SRS) resource indicator (SRI) is configured/activated in downlink control signal (DCI) for retransmission of data. To enable better performance in retransmission, the UE may dynamically turn on/off/switch panels for retransmissions.