PUSCH Power Headroom Reporting with Dynamic Pathloss Updates
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately estimating pathloss for power headroom reporting, which affects the efficient utilization of uplink resources and overall communication performance.
Innovation Solution
A wireless device receives RRC messages with configuration parameters for pathloss reference signals and power control sets, enabling dynamic pathloss estimation and updating these parameters through MAC-CE, to compute and transmit power headroom reports based on these settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pathloss estimation uses static reference signals, then device complexity is reduced, but pathloss estimation accuracy deteriorates due to inability to capture dynamic channel conditions
Solution Approach 1:
The patent applies dynamics by transitioning from static pathloss reference signals to dynamic pathloss reference signals that can be configured and updated through MAC-CE signaling. The network can dynamically indicate which reference signals should be used for pathloss estimation based on current channel conditions, enabling accurate pathloss measurement while maintaining manageable complexity through network-controlled signal selection.
2Reliability
If power control parameters are updated dynamically through MAC-CE, then power control accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by updating only the necessary power control parameters through MAC-CE signaling rather than transmitting complete parameter sets. The network selectively indicates updates to specific reference signals or power control settings, achieving accurate power control while minimizing the amount of signaling information that needs to be transmitted.
3Measurement precision
If pathloss reference signals are dynamically selected, then pathloss estimation accuracy is improved, but device complexity increases due to additional configuration requirements
Solution Approach 1:
The patent applies feedback by implementing a mechanism where the network provides feedback information through MAC-CE signaling about which pathloss reference signals should be used. The wireless device uses this feedback to select the appropriate reference signals for accurate pathloss estimation, reducing the complexity burden on the device by having the network provide the selection guidance rather than requiring the device to autonomously determine optimal signals.
Data Source
AI summary
A wireless device receives one or more radio resource control (RRC) messages comprising one or more configuration parameters, wherein the one or more configuration parameters indicate: physical uplink shared channel (PUSCH) pathloss reference signals (RSs) for pathloss estimation; sounding RS resource indicator (SRI)-PUSCH power control sets; and a pathloss RS update parameter that enables pathloss RS update for PUSCH by a medium-access control control element (MAC-CE), wherein the MAC-CE updates mapping between the SRI-PUSCH power control sets and the PUSCH pathloss reference RSs. The wireless device computes, for a power headroom report and based on the one or more configuration parameters comprising the pathloss RS update parameter, a pathloss estimation of an RS associated with a PUSCH pathloss reference RS index mapped to an SRI-PUSCH power control set with an identifier equal to zero. The wireless device transmits the power headroom report.