SRS Power Control Using Additional NTN Scheduling Offsets
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Solution Overview
Problem
Existing SRS transmission power control techniques in non-terrestrial networks (NTNs) do not adequately account for the additional scheduling offset required due to larger propagation delays, leading to sub-optimal power control adjustments.
Innovation Solution
Implement techniques that adjust SRS transmission power control by incorporating both conventional scheduling offset (k2) and an additional scheduling offset (Koffset) specific to NTNs, using cell-specific and UE-specific offset values to determine accurate power control adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional SRS power control techniques are used in NTNs, then the power control mechanism is simple, but the power control adjustments are sub-optimal due to not accounting for additional scheduling offset
Solution Approach 1:
The patent modifies the power control parameters by introducing an additional scheduling offset (Koffset) specific to NTNs. This parameter change accounts for the larger propagation delays in satellite communications, transforming the conventional power control formula to: P_SRS = P_0 + α·PL + f(ΔTPC), where the timing parameter now includes both conventional scheduling offset (k2) and NTN-specific additional offset (Koffset). This resolves the contradiction by improving accuracy through parameter adaptation without fundamentally changing the power control mechanism structure.
2Loss of time
If additional scheduling offset is incorporated into SRS power control, then the signal transmission timing is accurate, but the power control calculation complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the additional scheduling offset parameter (Koffset) through higher-layer signaling before SRS transmissions occur. The network configures this NTN-specific offset in advance, allowing the UE to directly use it in power control calculations without real-time computation. This resolves the contradiction by establishing accurate timing through pre-configured parameters, thereby avoiding increased real-time calculation complexity.
3Reliability
If SRS transmission uses extended time interval for TPC commands, then the power control adaptation is timely, but the transmission delay increases
Solution Approach 1:
The patent introduces dynamics by making the TPC command time interval adaptive rather than fixed. The time interval for accumulating TPC commands is dynamically determined based on the scheduling offset values and the additional NTN offset, allowing the system to adjust the accumulation period according to actual transmission conditions. This resolves the contradiction by enabling timely power control adaptation through dynamic interval adjustment while managing transmission delay through flexible timing.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for wireless communications by a user equipment (UE) generally including receiving signaling indicating one or more values for a scheduling offset between a downlink slot where downlink control information (DCI) is received and an uplink slot for transmitting a physical uplink shared channel (PUSCH) scheduled by the DCI; determining an additional offset to be used in conjunction with the scheduling offset values to determine PUSCH transmission timing; determining a power control adjustment for a sounding reference signal (SRS) transmission based on transmission power control (TPC) commands received in a time interval determined by one of the scheduling offset values and the additional offset; and transmitting SRS in an SRS transmission occasion, in accordance with the determined power control adjustment.