Power saving in wireless packet based networks

• US 7,920,577 B2
• Filed: 07/08/2004
• Issued: 04/05/2011
• Est. Priority Date: 07/08/2004
• Status: Active Grant

• Current Assignee: Avaya Incorporated
• Original Assignee: Avaya Incorporated
• Inventors: Sadot, Emek
• Primary Examiner(s): Ahmed, Salman
• Application Number:
  US10/886,859
• Publication Number:
  US 20060007924A1
• Time in Patent Office: 2,462 Days
• Field of Search: 370/312, 370/401, 370/352, 370/235, 370/466, 370/395, 370/395.5, 370/428, 709/225, 709/227, 709/249, 709/250, 726/6
• US Class Current: 370/401
• CPC Class Codes: H04L 49/203 ATM switching fabrics with multicast or broadcast capabilities
• CPC Class Codes: H04L 61/5014 using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]

Abstract

A method of handling broadcast packets, which are for a single network unit. The method includes receiving, by a network device, a packet, having a broadcast address, but directed to a single network unit and forwarding the packet through a plurality of ports of the network device, but not through at least one port of the device through which the packet was not received.

Claims

1. A method comprising:

receiving, by a first data-processing system, a first packet transmitted by a first terminal, wherein the first packet is to be transmitted by the first data-processing system to wireless terminals and wireline terminals based on a broadcast address of the first packet;

storing, by the first data-processing system after receiving the first packet, an identifier of the first packet along with a source address of the first packet;

identifying, by the first data-processing system;

(i) a first plurality of ports of the first data-processing system that only lead to wireline terminals, and

(ii) a second plurality of ports of the first data-processing system that only lead to wireless terminals;

transmitting, by the first data-processing system, the first packet to a second data-processing system, wherein the first packet is only transmitted through the first plurality of ports as a result of identifying that the first plurality of ports only lead to wireline terminals;

receiving, by the first data-processing system, a response to the first packet, wherein the response is transmitted by the second data-processing system; and

transmitting, by the first data-processing system, the response as a unicast packet to the first terminal, wherein the response is transmitted as a unicast packet based on the identifier of the first packet.

2. The method of claim 1 wherein the first packet is:

(i) a Dynamic Host Configuration Protocol packet, and

(ii) a request for an Internet Protocol address.

3. The method of claim 1 wherein the first packet is:

(i) a Bootstrap Protocol packet, and

(ii) a request for an Internet Protocol address.

4. The method of claim 1 wherein the second plurality of ports connect the first data-processing system to an access point that only leads to wireless terminals.

5. The method of claim 4 wherein the access point is configured to transmit a second packet received from a first wireless terminal to only wireline terminals, and wherein the second packet is a request for an Internet Protocol address.

6. The method of claim 1

wherein the first data-processing system identifies the first plurality of ports and the second plurality of ports based on exchanging control packets between:

(i) the first data-processing system and the wireline terminals, and

(ii) the first data-processing system and the wireless terminals.

7. The method of claim 1 wherein the first data-processing system transmits the first packet to the second data-processing system via the first plurality of ports when, and only when, the first data-processing system identifies that:

(i) the first packet is a Dynamic Host Configuration Protocol request packet, and

(ii) the first packet comprises a broadcast address.

8. The method of claim 1 wherein the first data-processing system transmits the response as a unicast packet to the first terminal when, and only when, the first data-processing system identifies that:

(i) the response is a Dynamic Host Configuration Protocol response packet, and

(ii) the response comprises a broadcast address.

9. The method of claim 1 wherein the task of transmitting the response further comprises:

identifying, by the first data-processing system, whether the response matches the identifier of the first packet, wherein the identifier is established by the first data-processing system in response to receiving the first packet from the first terminal; and

replacing, by the first data-processing system, a broadcast address of the response with the source address of the first packet when the response matches the identifier.

10. The method of claim 1 wherein the response received from the second data-processing is intended to be broadcasted to:

(i) the first plurality of ports of the first data-processing system that only lead to wireline terminals, and

(ii) a second plurality of ports of the first data-processing system that only lead to wireless terminals.

11. The method of claim 1 wherein the source address of the first packet is a Media Access Control address of the first terminal.

12. The method of claim 1 wherein the source address is extracted from an application layer field of the first packet by the first data-processing system.

13. A method comprising:

transmitting, by a first data-processing system, a first packet to;

(i) a plurality of wireline terminals, and

(ii) a plurality of wireless terminals;

receiving, by the first data-processing system, a first response to the first packet from;

(i) the plurality of wireline terminals, and

(ii) the plurality of wireless terminals;

identifying, by the first data-processing system, based on the first response;

(i) a first plurality of ports of the first data-processing system that only lead to the plurality of wireline terminals, and

(ii) a second plurality of ports of the first data-processing system that only lead to the plurality of wireless terminals;

receiving, by the first data-processing system, a second packet transmitted by a first terminal, wherein the second packet is to be broadcasted to the plurality of wireline terminals and the plurality of wireless terminals based on a broadcast address of the second packet; and

selectively transmitting, by the first data-processing system, the second packet to a second data-processing system wherein the second packet is selectively transmitted to the first plurality of ports as a result of identifying that the first plurality of ports only lead to the plurality of wireline terminals.

14. The method of claim 13 wherein the second packet is:

(i) a Dynamic Host Configuration Protocol (DHCP) packet, and

(ii) a request to retrieve an Internet Protocol address.

15. The method of claim 13 wherein the second packet is:

(i) a Bootstrap Protocol (BOOTP) packet, and

(ii) a request to retrieve an Internet Protocol address.

16. The method of claim 13 wherein the second plurality of ports of the first data-processing system connect the first data-processing system to an access point, and wherein the access point is only connected to wireless terminals.

17. The method of claim 16 wherein the access point is configured to transmit a third packet received from a first wireless terminal to only wireline terminals, and wherein the third packet is a request for address allocation.

18. The method of claim 13 wherein the second packet is intended to be broadcasted to the plurality of wireline terminals and the plurality of wireless terminals based on a broadcast address specified in the second packet.

19. The method of claim 13 further comprising:

receiving, by the first data-processing system, a second response to the second packet, wherein the second response is transmitted by the second data-processing system; and

transmitting, by the first data-processing system, the second response to the first terminal as a unicast packet.

20. The method of claim 19 wherein the task of transmitting the second response as a unicast packet to the first terminal further comprises:

identifying, by the first data-processing system, whether the second response matches an identifier of the second packet, wherein the identifier is established by the first data-processing system in response to receiving the second packet from the first terminal; and

replacing, by the first data-processing system, a broadcast address of the second response with a source address of the second packet when the second response matches the identifier.

21. The method of claim 20 wherein the source address of the second packet is a Media Access Control (MAC) address of the first terminal.