Patent ID: 8279814

Claim:
A method for allocating a channel time in a Wireless Personal Area Network (WPAN) comprising a parent piconet and at least one child piconet, in which a parent piconet coordinator (PNC) allocates a channel time to child piconet coordinators (PNCs) having different PHY transmission modes, the method comprising: receiving a request frame transmitted from at least one of the child PNCs from among the child PNCs having different PHY transmission modes, which requests channel time allocation for data transmission, according to a common mode; and transmitting a beacon frame including channel time allocation information corresponding to the request frame to the child PNCs having different PHY transmission modes according to the common mode, wherein the common mode is a PHY transmission mode commonly supported by the parent PNC and the child PNCs having different PHY transmission modes, and wherein the channel time allocation information comprises information regarding a time duration used in communication between a plurality of devices in the parent piconet and information regarding a time duration used in communication between a plurality of devices in the child piconet.