Research in Motion Corporation

Blackberry Corporation

Charles Wang

Fraser C Gibbs

Steve Michael Hanov

Fraser Gibbs

Apparatus, and an associated method, for negotiating an LLC frame size for a UMA/GAN network. A calculator, embodied at a mobile station, calculates an optimal frame size, i.e., an N201-U value. A negotiation initiator initiates a frame size negotiation with a network entity. The frame size negotiation utilizes the calculated optimal frame size. And, a frame size is allocated responsive to the negotiation. The allocated frame size is used in the formation of user data packets that are constrained to be of sizes that are close to the allocated N201-U value, defined at the LLC layer.

Apparatus, and associated method, for selecting and negotiating frame size of communication data communicated in a radio communication system

A system and method of unacknowledged Network Layer Service Access Point Identifier (NSAPI) recovery in Sub-Network Dependent Convergence Protocol (SNDCP) communication are disclosed herein. The disclosed techniques prevent the loss of data which may result from changing between GPRS/GSM modes in a Class B mobile station (MS).

System and method of unacknowledged network layer service access point identifier (NSAPI) recovery in sub-network dependent convergence protocol (SNDCP) communication

The invention is directed to a process for transferring data packets through a protocol stack employed by the device for transmitting packets on a packet connection to a wireless network, said wireless network operating at least two, distinct wireless access technologies such as GSM/GPRS and UMTS. The packet transfer process generally comprises each layer of a protocol stack for a currently active packet connection path providing confirmation to a next, higher layer in the stack of successful reception of a data packet from that layer, thereby confirming successful transfer of the data packet through the stack. The first layer of the stack stores a copy of a transferred packet until such time as its receives confirmation from the next, lower layer of successful transfer of the packet of the stack. In the absence of such confirmation and on the occurrence of a switch (hand-off) of the packet connection to a new connection path, particularly one of a different wireless access technology, the stored packet is transferred to the protocol stack to be employed by the wireless device for the new packet connection path. Consequently, the packet transfer process avoids packets being lost on the occurrence of a switch between different technology wireless access packet connection paths.

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Waterloo, Canada

Charles Wang