Systems and methods for improved data throughput in communications networks

• US 7,505,447 B2
• Filed: 09/20/2005
• Issued: 03/17/2009
• Est. Priority Date: 11/05/2004
• Status: Active Grant

• Current Assignee: Ruckus IP Holdings LLC
• Original Assignee: Ruckus Wireless, Inc. (CommScope Holding Company, Inc.)
• Inventors: Kish, William S., Chanak, John, Gram, Charles Andrew
• Primary Examiner(s): Ly; Nghi H
• Application Number:
  US11/232,196
• Publication Number:
  US 20060098613A1
• Time in Patent Office: 1,274 Days
• Field of Search: 370/349, 370/328, 370/338, 455/414.1, 455/456.3
• US Class Current: 370/349
• CPC Class Codes: H04N 21/6405 Multicasting data broadcast and multicast in packet switching networks H04L12/18
• CPC Class Codes: H04N 21/6408 Unicasting
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• 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 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

An access point of a communications network is disclosed configured to receive a multicast or broadcast packet from a source. The access point converts the multicast or broadcast packet into a unicast packet addressed to a station associated with the access point. The access point then transmits the unicast packet over the communications network from the access point to the station. The access point further may determine a minimum data rate by which the access point may transmit the multicast or broadcast packet to the station and determines an effective unicast rate for transmitting the unicast packet to the station. If the effective unicast rate does not exceed the minimum data rate, the access point does not transmit the unicast packet to the station and transmits the multicast or broadcast packet.

Claims

1. A method for improving throughput in a communications network, the method comprising:

receiving into an access point of the communications network a multicast packet from a source, wherein the access point maintains a list of stations to receive a multicast packet that has been converted into a unicast packet;

converting the multicast packet into a unicast packet at the access point, the conversion taking place at the media access control layer, the converted multicast packet addressed to a station associated with the access point and identified on the list of stations to receive the converted packet; and

transmitting the unicast packet over the communications network from the access point to the station, wherein the unicast packet is transmitted at a higher physical data rate than a corresponding multicast or broadcast packet.

2. The method of claim 1, wherein the communications network comprises an IEEE 802.11 wireless network.

3. The method of claim 1, wherein the multicast packet includes a user datagram protocol networking message.

4. The method of claim 1, wherein the multicast packet includes a multicast control packet.

5. The method of claim 1 further comprising:

determining an antenna configuration on which to transmit to the station;

determining a physical data rate at which to transmit to the station; and

transmitting the unicast packet on the antenna configuration and at the physical data rate over a wireless network from the access point to the station.

6. The method of claim 1 further comprising:

querying the station to determine an address of the station; and

mapping an address of the multicast packet to the address of the station.

7. The method of claim 1 further comprising:

transmitting a join request from the station to the source; and

associating in the access point the station to an address of the multicast packet based on the join request.

8. The method of claim 1, further comprising retransmitting the unicast packet one or more times if an acknowledgment is not received.

9. A method for improving throughput in a communications network, the method comprising:

receiving into an access point of the communications network a multicast packet from a source, wherein the access point maintains a list of stations to receive a multicast packet that has been converted into a unicast packet;

determining a first physical data rate by which the access point may transmit the multicast packet to a first station associated with the access point;

determining a second physical data rate by which the access point may transmit the multicast packet to a second station associated with the access point; and

not transmitting the multicast packet to the first station and the second station if the transmission would not increase throughput in the communications network;

converting the multicast packet into a first unicast packet at the media access control layer, the conversion taking place at the access point, the first unicast packet addressed to the first station and identified on the list of stations to receive the converted packet;

converting the multicast packet into a second unicast packet at the media access control layer, the conversion taking place at the access point, the second unicast packet addressed to the second station and identified on the list of stations to receive the converted packet;

transmitting the first unicast packet over the communications network from the access point to the first station; and

transmitting the second unicast packet over the communications network from the access point to the second station, wherein the unicast packets are transmitted to the first station and the second station at a higher physical data rate than a corresponding multicast packet.

10. An access point for improving throughput in a communications network, the access point configured to:

receive a multicast packet from a source, wherein the access point maintains a list of stations to receive a multicast packet that has been converted into a unicast packet;

convert the multicast packet into a unicast packet addressed to a station associated with the access point and identified on the list of stations to receive the converted packet, the conversion taking place at the media access control layer; and

transmit the unicast packet over the communications network from the access point to the station, wherein the unicast packet is transmitted at a higher data rate than a corresponding multicast packet.

11. The access point of claim 10 wherein the communications network comprises an IEEE 802.11 wireless network.

12. The access point of claim 10 further configured to:

determine an antenna configuration on which to transmit to the station;

determine a physical data rate at which to transmit to the station; and

transmit the unicast packet on the antenna configuration and at the physical data rate over a wireless network from the access point to the station.

13. The access point of claim 10 further configured to:

query the station to determine an address for the station; and

map an address of the multicast packet to the address of the station.

14. The access point of claim 10 further configured to associate the station to an address of the multicast packet based on a join request transmitted from the station to the source.