Ethernet switch in a terminal for a wireless metropolitan area network

• US 6,665,285 B1
• Filed: 12/21/1998
• Issued: 12/16/2003
• Est. Priority Date: 10/14/1997
• Status: Expired due to Term

• Current Assignee: Sparkmotion Incorporated (Quarterhill Inc. (f/k/a Wi-LAN Inc.))
• Original Assignee: Alvarion Israel (2003) limited (Alvarion Limited)
• Inventors: Huen, Tat, Treadaway, Kirk, Ngoc, Tho Le
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): NGUYEN, HANH N
• Application Number:
  US09/218,253
• Time in Patent Office: 1,821 Days
• Field of Search: 370/349, 370/315, 370/400, 370/401, 370/402, 370/403, 370/392, 370/389, 370/328, 370/333, 370/338, 370/351, 370/356, 370/310.2, 370/312, 370/428, 370/429, 370/410, 370/412, 370/413
• US Class Current: 370/338
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 12/2852 Metropolitan area networks
• CPC Class Codes: H04L 12/413 with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
• CPC Class Codes: H04L 12/4604 LAN interconnection over a backbone network, e.g. Internet, Frame Relay
• CPC Class Codes: H04L 2012/445 with switching in a hub, e.g. ETHERNET switch
• CPC Class Codes: H04L 25/05 Electric or magnetic storage of signals before transmitting or retransmitting for changing the transmission rate
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/13 in a LAN segment, e.g. ring or bus
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 52/20 using error rate
• CPC Class Codes: H04W 52/265 taking into account the quality of service QoS
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]
• CPC Class Codes: H04W 84/04 Large scale networks; Deep hierarchical networks
• CPC Class Codes: H04W 88/14 Backbone network devices

Abstract

Method and apparatus for an Ethernet switch in a terminal for a wireless metropolitan area network. In accordance with an aspect of the invention, a terminal for a wireless link in a metropolitan area network includes a network switch having a first port for receiving the data packets from a computer network and a second port for forwarding the data packets; rate buffers coupled to the network switch for receiving the data packets from the second port; and a wireless transceiver coupled to the rate buffers for receiving the data packets from the rate buffers and for communicating the data packets over the wireless link. The data packets can be Fast Ethernet data packets and the network switch can include a 100 mega-bits-per-second port for receiving the Fast Ethernet packets. The terminal can include a packet buffer for storing the data packets prior to storing the data packets in the rate buffer. The network switch can be a layer-two switch. The network switch can store the data packets in the packet buffer in response to a level of space available in the rate buffer, in response to rain fade in the wireless link, in response to interference in the wireless link, or in response to a detected bit error rate for communication via the wireless link. The terminal can include an extender device coupled to the broadcast device for receiving the data packets from the computer network and for providing the data packets to the broadcast device.

Claims

1. A terminal for a wireless link in a metropolitan area network, the terminal having a broadcast device, the broadcast device comprising:

a. a network switch having a first port for receiving data packets from a computer network and a second port for forwarding the data packets;

b. rate buffers coupled to the network switch for receiving the data packets from the second port; and

c. a wireless transceiver coupled to the rate buffers for receiving the data packets from the rate buffers and for communicating the data packets over the wireless link;

further comprising packet buffers coupled to the network switch wherein the network switch selectively stores the data packets in the packet buffers prior to storing the data packets in the rate buffers;

wherein the network switch is a layer-two switch;

wherein the layer-two switch stores the data packets in the packet buffers in response to a level of space available in the rate buffers;

wherein the layer-two switch stores the data packets in the packet buffers in response to rain fade in the wireless link; and

wherein the layer-two switch stores the data packets in the packet buffers in response to a detected bit error rate for communication via the wireless link.

2. The terminal according to claim 1 wherein the layer-two switch stores the data packets in the packet buffers in response to rain fade in the wireless link.

3. A terminal for a wireless link in a metropolitan area network, the terminal having a broadcast device, the broadcast device comprising:

a. a network switch having a first port for receiving data packets from a computer network and a second port for forwarding the data packets;

b. rate buffers coupled to the network switch for receiving the data packets from the second port; and

c. a wireless transceiver coupled to the rate buffers for receiving the data packets from the rate buffers and for communicating the data packets over the wireless link;

further comprising packet buffers coupled to the network switch wherein the network switch selectively stores the data packets in the packet buffers prior to storing the data packets in the rate buffers;

wherein the network switch is a layer-two switch;

wherein the layer-two switch stores the data packets in the packet buffers in response to interference in the wireless link.

4. The terminal according to claim 3 wherein the layer-two switch stores the data packets in the packet buffers in response to a detected bit error rate for communication via the wireless link.

5. A terminal for a wireless link in a metropolitan area network, the terminal comprising:

a. an extender device for receiving data packets from a computer network coupled to the extender device and for forwarding the data packets;

b. a broadcast device coupled to the extender device and having a network switch for receiving the data packets from the extender device, a packet formatting apparatus coupled to the network switch for formatting the data packets into radio frames and a wireless transceiver coupled to the packet formatting apparatus for communicating the data packets over the wireless link;

c. packet buffers coupled to the network switch wherein the network switch selectively stores the data packets in the packet buffers;

c. rate buffers coupled to the network switch wherein the network switch stores the data packets in the rate buffers during periods when the network switch does not store data packets in the packet buffers;

d. a packet formatting apparatus for formatting the data packets into radio frames wherein the packet formatting apparatus receives the data packets from the rate buffers, wherein the data packets are stored in the packet buffers according to an amount of space available in the rate buffers.

6. A method of communicating Fast Ethernet data packets over a wireless link, the method comprising steps of:

a. receiving data packets into an extender device from a computer network coupled to the extender device;

b. forwarding the data packets to a broadcast device coupled to the extender device, wherein the broadcast device includes a network switch for receiving the data packets from the extender device, a packet formatting apparatus coupled to the network switch for formatting the data packets into radio frames and a wireless transceiver coupled to the packet formatting apparatus for communicating the data packets over the wireless link;

c. formatting the data packets into radio frames utilizing the packet formatting apparatus;

d. communicating the radio frames over the wireless link utilizing the wireless transceiver;

e. storing data packets received from the extender device by the network switch into rate buffers coupled to the network switch;

f. removing data packets from the rate buffers;

g. formatting the data packets removed from the rate buffers according to radio frames; and

h. selectively storing the data packets in packet buffers prior to storing the data packets in the rate buffers in response to a level of space available in the rate buffers.

7. A terminal for a wireless link in a metropolitan area network, the terminal having a broadcast device, the broadcast device comprising:

a. a network switch having a first port for receiving data packets from a computer network and a second port for forwarding the data packets;

b. rate buffers coupled to the network switch for receiving the data packets from the second port;

c. a packet formatting apparatus coupled to the rate buffers for formatting the data packets into radio frames; and

d. a wireless transceiver coupled to the packet formatting apparatus for communicating the data packets over the wireless link,

said terminal further comprising packet buffers coupled to the network switch, wherein the network switch selectively stores data packets in the packet buffers prior to storing data packets in the rate buffers in response to a level of space available in the rate buffers, by storing latency intolerant traffic in the rate buffers and latency tolerant traffic in the packet buffers.

8. A terminal for a wireless link in a metropolitan area network, the terminal having a broadcast device, the broadcast device comprising:

a. a network switch having a first port for receiving a first portion of data packets from a computer network, a second port for receiving a second portion of the data packets from the computer network and a third port for forwarding the data packets;

b. rate buffers coupled to the network switch for receiving the data packets from the third port;

c. a packet formatting apparatus coupled to the rate buffers for formatting the data packets into radio frames; and

d. a wireless transceiver coupled to the packet formatting apparatus for communicating the data packets over the wireless link,

said terminal further comprising packet buffers coupled to the network switch, wherein the network switch selectively stores data packets in the packet buffers prior to storing data packets in the rate buffers in response to a level of space available in the rate buffers, by storing latency intolerant traffic in the rate buffers and latency tolerant traffic in the packet buffers.