Telecommunications – Radiotelephone system – Message storage or retrieval
Reexamination Certificate
2006-01-17
2006-01-17
Perez-Gutierrez, Rafael (Department: 2681)
Telecommunications
Radiotelephone system
Message storage or retrieval
C455S550100
Reexamination Certificate
active
06987961
ABSTRACT:
A feature phone has a base-band processor and an applications processor that communicate with each other by emulating an internal Ethernet within the phone. TCP/IP stacks in each processor receive data from high-level applications for transmission to the other processor. Ethernet-emulating drivers are called by the IP layers. An Ethernet-emulating transmit driver writes IP-packet data to a shared memory and sends an interrupt to the other processor, which activates a receive routine that reads the IP packet data from the shared memory and sends it up through the TCP/IP stack. There is no twisted-pair cable or other media since the shared memory acts as the transfer media. A shared mailbox holds the packet length and sends an interrupt to one processor when written, while a general-purpose input-output GPIO module sends an interrupt to the other processor. The internal emulated-Ethernet is entirely within the phone and separate from cellular networks.
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Auvinen Stuart T.
Figueroa Marisol
NeoMagic Corp.
Perez-Gutierrez Rafael
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