Transmit Power Priority Based On Cell Types In Wireless Devices

What is this patent about?

’743 is related to the field of wireless communication, specifically addressing the problem of managing uplink transmissions in scenarios where a wireless device is configured to communicate using multiple cells of different types, such as licensed and unlicensed spectrum. In modern cellular networks, carrier aggregation and dual connectivity allow devices to utilize multiple carriers simultaneously to increase data rates. However, this can lead to situations where the device's total transmit power exceeds its maximum allowed limit, requiring prioritization and power scaling of different signals.

The underlying idea behind ’743 is to intelligently manage the transmission power of multiple uplink signals originating from a wireless device when the combined power would exceed the device's limit. The key inventive insight is to prioritize uplink signals based on the cell type they are transmitted from (e.g., licensed vs. unlicensed). This allows the device to selectively drop or scale down the power of lower-priority signals to ensure that higher-priority signals can be transmitted without violating power constraints.

The claims of ’743 focus on a method and apparatus for a wireless device to receive configuration parameters for cells of different types, determine the total transmit power required for multiple uplink signals, and then selectively drop or scale the power of one or more of those signals based on a transmit power priority that is determined by the cell type. The independent claims cover both the device-side implementation of this power management scheme and the corresponding base station behavior.

In practice, the invention allows a wireless device to maintain connectivity and performance in complex network configurations. For example, if a device is transmitting on both a licensed cell (for reliable control signaling) and an unlicensed cell (for opportunistic data throughput), and it approaches its power limit, the device might reduce the power on the unlicensed cell's transmission to ensure the licensed cell's transmission remains robust. This ensures that critical control information is not lost, even if data throughput is temporarily reduced.

This approach differs from prior solutions by introducing a cell-type-aware prioritization scheme. Instead of simply dropping or scaling signals based on arbitrary criteria, ’743 leverages the inherent characteristics of different cell types to make informed decisions. This allows for a more nuanced and efficient power management strategy that balances the need for reliable control signaling with the desire for high data throughput, especially in environments where licensed assisted access (LAA) is employed.