# US 7,613,811 B1 · Selecting a communications protocol

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- Number: US 7,613,811 B1
- Document ID: US7613811B1
- Status: Granted
- Kind: B1
- Application number: 09/954,320
- Filed: 2001-09-17
- Granted: 2009-11-03
- Earliest claimed: 2001-09-17
- Assignees: Cisco Technology, Inc.
- Inventors: Rajesh Bhalla; Hsia R. Yu
- Web page: https://patentgrep.com/patent/US7613811B1

## CPC

- H04W 80/045: {involving different protocol versions, e.g. MIPv4 and MIPv6}
- H04L 69/18: Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
- H04W 88/18: Service support devices; Network management devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

According to one embodiment of the present invention, a method, a logic, and systems for selecting a communications protocol are disclosed. An initial request having a static Internet Protocol address is received from a mobile node, and a dynamic address is assigned to the mobile node. A data packet is received from the mobile node, and whether the data packet uses the dynamic address or has a mobile Internet Protocol request is determined. If the data packet has the mobile Internet Protocol request, the data packet is processed using a mobile Internet Protocol process. Alternatively, if the data packet uses the dynamic address, the data packet is processed using a simple Internet Protocol process.

## Claims

### Claim 1

A method for selecting a communications protocol, comprising:
receiving an initial request comprising a static Internet Protocol address from a mobile node;
assigning a dynamic address to the mobile node;
receiving a data packet from the mobile node;
determining, at a packet data serving node, whether the data packet comprises the dynamic address or a mobile Internet Protocol request to select a communications protocol;
processing the data packet at the packet data serving node using a mobile Internet Protocol process if the data packet comprises the mobile Internet Protocol request; and
processing the data packet at the packet data serving node using a simple Internet Protocol process if the data packet comprises the dynamic address.

### Claim 2 (depends on 1)

The method of claim 1, wherein the static Internet Protocol address comprises a non-zero Internet Protocol address.

### Claim 3 (depends on 1)

The method of claim 1, further comprising authenticating the mobile node in response to receiving the initial request.

### Claim 4 (depends on 1)

The method of claim 1, wherein the mobile Internet Protocol request comprises a mobile Internet Protocol registration request.

### Claim 5 (depends on 1)

The method of claim 1, wherein the mobile Internet Protocol request comprises an agent solicitation.

### Claim 6 (depends on 1)

The method of claim 1, further comprising establishing a point-to-point session with the mobile node in response to receiving the initial request.

### Claim 7 (depends on 1)

The method of claim 1, wherein processing the data packet using the mobile Internet Protocol process comprises:
transmitting the mobile Internet Protocol request to a home agent;
receiving a mobile Internet Protocol reply from the home agent, the mobile Internet Protocol reply comprising an address assigned to the mobile node; and
forwarding the mobile Internet Protocol reply to the mobile node.

### Claim 8

A system for selecting a communications protocol, comprising:
a processor associated with a packet data serving node operable to:
receive an initial request comprising a static Internet Protocol address from a mobile node;
assign a dynamic address to the mobile node;
receive a data packet from the mobile node; and
determine whether the data packet comprises the dynamic address or a mobile Internet Protocol request to select a communications protocol; and
a first protocol module coupled to the processor and operable to process the data packet using a mobile Internet Protocol process if the data packet comprises the mobile Internet Protocol request; and
a second protocol module coupled to the processor and operable to process the data packet using a simple Internet Protocol process if the data packet comprises the dynamic address.

### Claim 9 (depends on 8)

The system of claim 8, wherein the static Internet Protocol address comprises a non-zero Internet Protocol address.

### Claim 10 (depends on 8)

The system of claim 8, wherein the processor is operable to authenticate the mobile node in response to receiving the initial request.

### Claim 11 (depends on 8)

The system of claim 8, wherein the mobile Internet Protocol request comprises a mobile Internet Protocol registration request.

### Claim 12 (depends on 8)

The system of claim 8, wherein the mobile Internet Protocol request comprises an agent solicitation.

### Claim 13 (depends on 8)

The system of claim 8, wherein the processor is operable to establish a point-to-point session with the mobile node in response to receiving the initial request.

### Claim 14 (depends on 8)

The system of claim 8, wherein the first protocol module is operable to process the data packet using the mobile Internet Protocol process by:
transmitting the mobile Internet Protocol request to a home agent;
receiving a mobile Internet Protocol reply from the home agent, the mobile Internet Protocol reply comprising an address assigned to the mobile node; and
forwarding the mobile Internet Protocol reply to the mobile node.

### Claim 15

A system for selecting a communications protocol, comprising:
a processor with a packet data serving node operable to:
receive a initial request comprising a static Internet Protocol address from a mobile node, the static Internet Protocol address comprising a non-zero Internet Protocol address;
assign a dynamic address to the mobile node;
establish a point-to-point session with the mobile node;
authenticate the mobile node;
receive a data packet from the mobile node; and
determine whether the data packet comprises the dynamic address or a mobile Internet Protocol request to select a communications protocol; and
a first protocol module coupled to the processor and operable to process the data packet using a mobile Internet Protocol process if the data packet comprises the mobile Internet Protocol request by:
transmitting the mobile Internet Protocol request to a home agent;
receiving a mobile Internet Protocol reply from the home agent, the mobile Internet Protocol reply comprising an address assigned to the mobile node; and
forwarding the mobile Internet Protocol reply to the mobile node; and
a second protocol module coupled to the processor and operable to process the data packet using a simple Internet Protocol process if the data packet comprises the dynamic address.