PSCCH Power Control for Sidelink Coverage Under Total Power Constraints
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Solution Overview
Problem
Current power control solutions for NR sidelink channels face challenges such as transient issues at transmit power amplifiers, failure to consider SNR or SINR targets, and lack of adaptability for unicast/groupcast transmissions.
Innovation Solution
The proposed solution involves setting the transmit power of the PSCCH based on the output of the OLPC formula and potentially boosting it, while ensuring that the power allocated to the PSSCH is adjusted accordingly to maintain total power constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the transmit power of PSCCH is increased to improve coverage, then PSCCH coverage is improved, but the total power constraint is violated and PSSCH power is reduced
Solution Approach 1:
The patent implements dynamic power adjustment where the PSCCH power is adaptively increased only when coverage requirements demand it, while the PSSCH power is dynamically reduced to compensate. This dynamic balancing act allows the system to improve PSCCH coverage temporarily when needed while maintaining adherence to total power constraints through real-time power reallocation between the two channels.
2Loss of information
If the transmit power of PSCCH is boosted to enhance resource allocation awareness, then resource allocation awareness is improved, but the probability of power constraint violation increases
Solution Approach 1:
The patent employs a feedback mechanism where the system monitors the power allocation between PSCCH and PSSCH, and when PSCCH power needs to be increased to improve resource allocation awareness, the corresponding reduction in PSSCH power is automatically compensated. This feedback loop ensures that total power constraints are maintained while still allowing PSCCH power to be boosted when coverage and resource allocation awareness require it.
3Reliability
If the transmit power of PSCCH is increased to reduce collision probability, then collision probability is reduced, but the power allocated to PSSCH is reduced
Solution Approach 1:
The system dynamically adjusts power allocation based on traffic conditions and channel state. When collision probability needs to be reduced, PSCCH power is temporarily increased, and the corresponding power reduction in PSSCH is acceptable because the dynamic nature of the system allows for power reallocation in subsequent time slots when collision risk is lower, thus maintaining overall system performance.
4Productivity
If the transmit power of PSCCH is boosted to improve system throughput, then system throughput is improved, but transient issues at transmit power amplifiers occur
Solution Approach 1:
Instead of continuously boosting PSCCH power, the system applies periodic power boosting only when and where needed. By spatially and temporally distributing the power boosting actions across different resource blocks and time slots, the system achieves the necessary throughput improvement while allowing the power amplifier to settle between boosts, thereby avoiding transient instability issues.
Data Source
AI summary
According to some embodiments, a method is performed by a wireless device. The method comprises obtaining a data channel transmit power for transmitting on a sidelink data channel to a receiving wireless device, obtaining a control channel transmit power for transmitting on a sidelink control channel, and transmitting on the sidelink data channel at the data channel transmit power and on the sidelink control channel at the control channel transmit power. In certain embodiments, the control channel transmit power is based on the data channel transmit power. In other embodiments, the control channel transmit power is determined independently of the data channel transmit power.