Wireless local area networks

• US 8,027,320 B2
• Filed: 04/11/2007
• Issued: 09/27/2011
• Est. Priority Date: 03/17/2000
• Status: Expired due to Term

• Current Assignee: Extreme Networks, Inc.
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Beach, Robert
• Primary Examiner(s): Hoang; Thai D
• Application Number:
  US11/733,839
• Publication Number:
  US 20070230426A1
• Time in Patent Office: 1,630 Days
• Field of Search: 370338-349, 370/328, 370419-420, 455/422.1, 4554261-4262, 455462-466, 455/500, 455554-557
• US Class Current: 370/338
• CPC Class Codes: H04L 12/4625 Single bridge functionality, e.g. connection of two networks over a single bridge
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 69/14 Multichannel or multilink protocols
• CPC Class Codes: H04L 69/18 Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
• CPC Class Codes: H04W 12/02 Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
• CPC Class Codes: H04W 60/00 Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A wireless local area network is provided with simplified RF ports which are configured to provide lower level media access control functions. Higher level media access control functions are provided in a cell controller, which may service one or more RF ports that are capable operating with at least two wireless local area subnetworks. Mobile units can also be configured with the higher level media access control functions being performed in a host processor.

Claims

1. A Radio Frequency (RF) port adapted for a wireless communication system and for use with a cell controller that performs a first plurality of functions of a wireless communication standard protocol and that is at least partially housed in a first housing, comprising:

a second housing that is physically separate from said first housing;

an RF receiver housed in said second housing for receiving a first RF signal of a first Wireless Local Area Network (WLAN); and

a processor housed in said second housing, said processor receptive of said first RF signal from said RF receiver and performing a second plurality of functions of the wireless communication standard protocol without performing the first plurality of functions of the wireless communication standard protocol during at least one mode of operation to produce a first data signal from said first RF signal;

wherein the first plurality of functions and the second plurality of functions each includes at least one media access control function of the wireless communication standard protocol.

2. The RF port of claim 1, wherein the at least one media access control function includes a non-time-critical media access control function.

3. The RF port of claim 2, wherein the second plurality of functions includes at least one time-critical media access control function.

4. The RF port of claim 1, wherein the wireless standard communications protocol is an IEEE 802.11 protocol.

5. The RF port of claim 1, wherein the RF port is configured to communicate with the cell controller over an Ethernet connection.

6. The RF port of claim 5, wherein the RF port receives power via the Ethernet connection.

7. The RF port of claim 5, wherein the RF port is configured to receive encapsulated Ethernet frames.

8. A Radio Frequency (RF) port adapted for a wireless communication system and for use with a cell controller that performs a first plurality of functions of a wireless communication standard protocol and that is at least partially housed in a first housing, comprising:

a second housing that is physically separate from said first housing;

an RF receiver housed in said second housing for receiving a first RF signal of a first Wireless Local Area Network (WLAN); and

a processor housed in said second housing, said processor receptive of said first RF signal from said RF receiver and performing a second plurality of functions of the wireless communication standard protocol without performing the first plurality of functions of the wireless communication standard protocol during at least one mode of operation to produce a first data signal from said first RF signal;

wherein the first plurality of functions includes at least one media access control function of the wireless communication standard protocol;

wherein the at least one media access control function includes a non-time-critical media access control function, wherein the second plurality of functions includes at least one time-critical media access control function; and

wherein the cell controller is further configured to perform a function selected from the group consisting of roaming, retransmission, rate control, load leveling, and association processing.

9. A Radio Frequency (RF) port adapted for a wireless communication system and for use with a cell controller that performs a first plurality of functions of a wireless communication standard protocol and that is at least partially housed in a first housing, comprising:

a second housing that is physically separate from said first housing;

an RF receiver housed in said second housing for receiving a first RF signal of a first Wireless Local Area Network (WLAN); and

a processor housed in said second housing, said processor receptive of said first RF signal from said RF receiver and performing a second plurality of functions of the wireless communication standard protocol without performing the first plurality of functions of the wireless communication standard protocol during at least one mode of operation to produce a first data signal from said first RF signal;

wherein the first plurality of functions includes at least one media access control function of the wireless communication standard protocol;

wherein the at least one media access control function includes a non-time-critical media access control function, wherein the second plurality of functions includes at least one time-critical media access control; and

wherein the second plurality of functions are selected from the group consisting of cyclic redundancy check, network activity vector, ready-to-send/clear-to-send, header generation and parsing, collision avoidance, frequency hopping, acknowledgement parsing, and retransmission time-outs.