Fixed OFDM wireless MAN utilizing CPE having internal antenna

• US 20050176379A1
• Filed: 04/01/2005
• Published: 08/11/2005
• Est. Priority Date: 10/22/1999
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: NextNet Wireless, Inc. (Motorola Solutions, Inc.)
• Inventors: Dunn, J. Eric, Grindahl, Mervin L., Kelman, Vladimir Z., Froelich, Stuart A., Barnes, Keith W.
• Granted Patent: US 7,626,920 B2
• Time in Patent Office: Days
• US Class Current: 455/68
• CPC Class Codes: H01Q 1/2291 used in bluetooth or WI-FI devices of Wireless Local Area Networks [WLAN] H01Q1/241 takes precedence; WLAN in general H04W
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 27/2662 Symbol synchronisation
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 84/14 WLL [Wireless Local Loop]; RLL [Radio Local Loop]
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/021 adapted for Wireless Local Loop operation
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A fixed wireless access system generally comprises a consumer premise equipment (CPE) unit, that is connected via an Ethernet interface to a personal computer or local area network, and a base station unit that is connected via an Ethernet interface to a network. As such, the CPE unit is preferably easily user-installed while the base station unit is preferably tower-mounted within a 1-5 mile range of the CPE unit. Both the CPE unit and base station unit preferably incorporate an integrated data transceiver/switch that enables a radio frequency air link operating in the 2.5-2.686 GHz range. Orthogonal frequency division multiplexing is used in the uplink and downlink transmissions between CPE units and base station units.

Claims

1. A wireless communication system, comprising:

a first transceiver and a second transceiver, wherein said first and second transceivers communicate over a radio frequency air link permitting both uplink transmissions and downlink transmissions, that utilize orthogonal frequency division multiplexing (OFDM) modulation, between said first and second transceivers, and wherein said downlink transmission is framed and said uplink transmission is unframed.

2. The system of claim 1 wherein said air link is established through a media access control (MAC) protocol.

3. The system of claim 2 wherein said MAC protocol provides a slotted-aloha media access with implicit reservation slots for a message with said transmission exceeding one slot of payload information.

4. The system of claim 1 wherein the frame of said downlink transmission includes a field selected from a group consisting of:

a destination address field, a frame header field, and a uplink channel status field.

5. The system of claim 4 wherein said uplink channel status field includes quality of service (QoS).

6. The system of claim 1 wherein said uplink transmission is presented within a fixed number of uplink slots.

7. The system of claim 1 wherein said uplink transmissions and said downlink transmissions are time division duplexed.

8. The system of claim 7 wherein said uplink transmissions are transmitted in a plurality of uplink slots and said downlink transmissions are transmitted in a plurality of downlink slots, and wherein there is a variable ratio of said downlink slots to said uplink slots.