Abstract: Disclosed are methods and apparatus for detecting mismatch of ciphering parameters, such as Count-C, in a wireless device and recovery therefrom. The methods and apparatus for detection include examining a predefined ciphered field, such as a Length Indicator field, in one or more received Radio Link Control (RLC) Protocol Data Units (PDUs). Next, a determination of when the field is invalid over a predetermined sample number of PDUs is performed. Mismatch of ciphering parameters can then be determined when a predetermined number of samples of the field detected as invalid exceed a predetermined threshold. Additionally, recovery of PDUs after mismatch detections is disclosed using a range of Hyper-Frame Numbers (HFNs) to decipher buffered PDUs, and then check which of the HFNs eliminate the parameter mismatch by again determining if parameter mismatch occurs using the methods and apparatus for detection.

Abstract: Implementations of systems, methods and apparatus include aspects of resource conservation strategies that may be useful for a USB compliant device that experiences resource limitations over durations longer than contemplated by the USB standards. Implementations of systems, methods and apparatus disclosed herein enable a USB compliant device to selectively process interrupts and/or other overhead resulting from USB communications between a host and the device. By not processing some interrupts and/or other overhead, based in part on the current level of resource utilization, a device can free up resources needed to process relatively high data-rate incoming traffic from the host. In some implementations, when locally implemented techniques prove to be insufficient, the device may optionally request that the host reduce the data-rate on the downlink.

Abstract: Disclosed are methods and apparatus for detecting mismatch of ciphering parameters, such as Count-C, in a wireless device and recovery therefrom. The methods and apparatus for detection include examining a predefined ciphered field, such as a Length Indicator field, in one or more received Radio Link Control (RLC) Protocol Data Units (PDUs). Next, a determination of when the field is invalid over a predetermined sample number of PDUs is performed. Mismatch of ciphering parameters can then be determined when a predetermined number of samples of the field detected as invalid exceed a predetermined threshold. Additionally, recovery of PDUs after mismatch detections is disclosed using a range of Hyper-Frame Numbers (HFNs) to decipher buffered PDUs, and then check which of the HFNs eliminate the parameter mismatch by again determining if parameter mismatch occurs using the methods and apparatus for detection.

Abstract: Implementations of systems, methods and apparatus include aspects of resource conservation strategies that may be useful for a USB compliant device that experiences resource limitations over durations longer than contemplated by the USB standards. Implementations of systems, methods and apparatus disclosed herein enable a USB compliant device to selectively process interrupts and/or other overhead resulting from USB communications between a host and the device. By not processing some interrupts and/or other overhead, based in part on the current level of resource utilization, a device can free up resources needed to process relatively high data-rate incoming traffic from the host. In some implementations, when locally implemented techniques prove to be insufficient, the device may optionally request that the host reduce the data-rate on the downlink.