Patent ID: 11924761
Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
Field: Digital communication (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A communication apparatus, comprising:
a receiver which, in operation and in a Wake-up Radio (WUR) state, receives a WUR Beacon transmission in a WUR beacon interval, the receiver being configured not to receive buffered downlink traffic data during the WUR state, wherein, during the WUR state, the communication apparatus continues to operate through the WUR beacon interval for two WUR duty cycles, the WUR beacon interval being configured for receiving one WUR Beacon transmission, and each WUR duty cycle including a WUR awake state and a WUR doze state; and
circuitry which, in operation:
determines wake-up operating parameters including a starting point of a duty cycle schedule of the receiver, wherein the duty cycle schedule specifies a period of the WUR duty cycle; and
enters WUR mode by communicating with a second communication apparatus, wherein a start timing of the WUR awake state is aligned with a target WUR Beacon transmission time (TWBTT) of the WUR Beacon transmission in the WUR mode or aligned with the TWBTT with an added constant time offset,

wherein:
one of the wake-up operating parameters is a time resolution of a partial Time Synchronization Function (TSF); and
the time resolution of the partial TSF is negotiated between the communication apparatus and the second communication apparatus based on a WUR TSF timer accuracy of each communication apparatus associated with the second communication apparatus, the negotiated time resolution of the partial TSF being used to calculate a maximum correctable drift due to a partial TSF field, the calculated maximum correctable drift being used to set the WUR Beacon interval, the maximum correctable drift due to the partial TSF field being calculated by Equation (1),

dmax=±2(Lpt−1)×Dpt  Equation(1)

wherein Lpt is a size of the Partial TSF field and Dpt is the time resolution of the Partial TSF field.