Packet number determination mechanism

摘要

Certain aspects of the present disclosure provide methods and apparatuses for determining a packet number for a packet, based on a transmit packet number (TPN), transmitted with the packet, a locally maintained base packet number (BPN), and a value of the TPN relative to one or more edges of a locally-maintained receive window. An example method generally includes receiving a packet having a transmitted packet number (TPN), maintaining a base packet number (BPN), maintaining a receive window defined by a first edge a and a second edge b, determining a value i of the TPN relative to at least one of the first edge a or the second edge b of the receive window, and calculating a packet number (PN) for the packet based on the TPN, the BPN, and the determination.

主权项

1. An apparatus for wireless communications, comprising:
an interface configured to receive a packet having a transmitted packet number (TPN); and a processing system configured to:
maintain a base packet number (RPN),maintain a receive window defined by a first edge a and a second edge b, wherein the receive window is maintained, with the first edge a as a lower edge and the second edge b as an upper edge, as:
a single window with a continuous segment between the lower edge a and upper edge b if b ≧w, wherein w is a width of the receive window, ora split window with discontinuous windows if b