Methods for delivery in a wireless communications network

A method for reliable delivery of packets in a wireless communication system, the method comprising:

• at a station:
• receiving a traffic indication message specifying that the station has traffic to receive;
• receiving packets wherein each packet has a priority;
• expecting at least one packet of a certain priority;
• determining that the station received a packet of a lower priority than the expected at least one packet to determine that the station missed the expected at least one packet;
• and
• sending a negative acknowledgement message, if the station determined that the station missed the expected at least one packet.

A method for saving station power in a wireless communication system, the method comprising:

• at a station:
• receiving a contention free period initiation signal
• receiving a traffic indication message specifying that the station has traffic to receive;
• receiving broadcast packets from the access point to the station;
• receiving multicast packets from the access point to the station wherein each multicast packet has a priority;
• expecting at least one multicast packet of a certain priority;
• entering a low power mode, if the expected at least one multicast packet has been received;
• determining that the station missed the expected at least one multicast packet;
• and
• receiving a contention free period end signal from the access point to the station.
• sending a negative acknowledgement message, if the station determined that the station missed the expected at least one multicast packet;