Uplink Power Control for Short-TTI SPS Transmissions
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Solution Overview
Problem
Existing communication processes that support long TTIs fail to effectively manage power control and reference signal transmission for short TTIs (sTTIs) in low-latency wireless communication, leading to degraded performance and lack of sTTI-specific mechanisms for semi-persistent scheduling (SPS) in uplink transmissions.
Innovation Solution
Implementing separate uplink power control information for SPS transmissions using sTTIs, independent of power control for long TTIs, and providing configuration information for reference signal transmissions, including cyclic shifts and index values to enable power control and resource allocation for multiple UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate uplink power control information is implemented for sTTI SPS transmissions, then power management efficiency and resource utilization are improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent segments power control information into separate entities for sTTI SPS transmissions, specifically introducing separate pathloss reference signals and power control parameters for sTTI SPS uplink transmissions. This segmentation allows independent optimization of power control for short TTIs without affecting long TTI operations, thereby improving power management efficiency while isolating the complexity to specific sTTI-related components.
Solution Approach 2:
The patent applies local quality by providing sTTI-specific power control parameters and pathloss reference signals only where needed for short TTI operations, rather than creating a completely separate power control system. This approach improves power management for sTTI transmissions while minimizing the increase in overall device complexity by reusing existing power control frameworks where applicable.
2Reliability
If sTTI-specific power control parameters are provided, then uplink transmission performance is improved, but signaling overhead increases
Solution Approach 1:
The patent implements multi-functionality by designing the sTTI-specific power control parameters to serve multiple purposes: they control power for sTTI SPS uplink transmissions, maintain compatibility with existing uplink power control frameworks, and enable flexible adaptation to different sTTI configurations. This universal approach improves uplink transmission performance while reducing redundant signaling by reusing existing parameter structures where possible.
3Measurement precision
If pathloss reference signals are provided for sTTI SPS uplink transmissions, then power control accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring pathloss reference signals and their associated parameters before sTTI SPS uplink transmissions occur. The base station provides the UE with pathloss reference signal configurations, association relationships, and power control parameters in advance through RRC signaling or downlink control information. This preliminary configuration enables accurate power control during actual transmissions while reducing real-time processing complexity by pre-establishing all necessary parameters and associations.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described that provide for indicating transmit power control information to a user equipment (UE) for semi-persistent scheduling (SPS) transmissions in short transmission time intervals (TTIs) from the UE, and for configuring reference signal transmissions in SPS transmissions of short TTIs. A UE may be configured with uplink power control information for SPS transmissions that use sTTIs that is separate from uplink power control for longer TTIs. A UE may receive the power control information and apply it in SPS transmissions that use sTTIs. Uplink transmit power for SPS sTTI transmissions may be independent of power control for regular sTTI transmissions and independent of power control for long TTI transmissions. UEs may apply a cyclic shift to reference signals transmitted is SPS transmissions according to a SPS configuration, rather than a cyclic shift indicated in a SPS activation command.