System and method for saving power in a wireless network by reducing power to a wireless station for a time interval if a received packet fails an integrity check

• US 7,415,624 B2
• Filed: 05/02/2007
• Issued: 08/19/2008
• Est. Priority Date: 04/06/2004
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Goodall, David S., Myles, Andrew F., Lam, Alex C. K., Miller, Donald J.
• Primary Examiner(s): CONNOLLY, MARK A
• Application Number:
  US11/743,603
• Publication Number:
  US 20070201419A1
• Time in Patent Office: 475 Days
• Field of Search: 713/320, 713/324, 713/300, 714/777, 714/781, 714/799, 709/230, 455/343.1, 455/343.2, 455/343.3
• US Class Current: 713/320
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method, an apparatus and a carrier medium storing instructions to implement the method. The method is in a first wireless station of a wireless network, and includes wirelessly receiving a signal corresponding to a packet wirelessly transmitted by a second wireless station. The packet includes a subpacket and a check sequence. The method further includes verifying the integrity of the subpacket, the verifying at least using the check sequence. The method further includes, in the case that the subpacket fails the verifying, reducing the power consumption of at least one component in the first wireless station for a time interval.

Claims

1. A method in a first wireless station of a wireless network, the method comprising:

wirelessly receiving a signal corresponding to a packet wirelessly transmitted by a second wireless station, wherein the packet includes a subpacket and a check sequence;

verifying the integrity of the subpacket, the verifying at least using the check sequence; and

in the case that the subpacket fails the verifying, reducing the power consumption of at least one component in the first wireless station for a first time interval,

wherein the packet substantially conforms to one of the variants of the IEEE 802.11 standard, and wherein the first time interval is set according to one or more parameters of the packet.

2. A method as recited in claim 1, wherein the verifying includes a calculation substantially conforming to a polynomial code checksum calculation.

3. A method as recited in claim 1, wherein the wireless network operates according to a wireless network protocol that includes a backoff procedure, the method further comprising, in the case that the subpacket fails the verifying, carrying out a backoff procedure according to the wireless network protocol.

4. A method in a first wireless station of a wireless network, the method comprising:

generating a check sequence to protect the integrity of a subpacket of a packet,

wherein the packet is to be wirelessly transmitted;

embedding the check sequence in an embedding field within the packet; and

wirelessly transmitting the packet;

such that a second wireless station wirelessly receiving a signal corresponding to the packet can verify the integrity of the subpacket at least using the check sequence and, in the case that the subpacket fails the verifying, can reduce power consumption of at least one component in the second wireless station for a time interval,

wherein the packet substantially conforms to one of the variants of the IEEE 802.11 standard, and wherein the time interval is set according to one or more parameters of the packet.

5. A method as recited in claim 4, wherein the generating includes a calculation substantially conforming to a polynomial code checksum calculation.

6. A method as recited in claim 4, wherein the embedding field is located prior to the end of the subpacket.

7. An apparatus in a first wireless station of a wireless network, the apparatus comprising:

a processing unit including a wireless transceiver coupled to an antenna, the processing unit arranged to wirelessly receive a signal corresponding to a packet wirelessly transmitted by a second wireless station, wherein the packet includes a subpacket and a check sequence;

a subpacket verifier coupled to the processing unit arranged to verify the integrity of the subpacket, the verifying at least using the check sequence; and

a power saver coupled to the subpacket verifier arranged, in the case that the subpacket fails the verifying, to reduce the power consumption of at least one component in the first wireless station for a first time intervals,

wherein the packet substantially conforms to one of the variants of the IEEE 802.11 standard, and wherein power saver is configured such that the first time interval is set according to one or more parameters of the packet.

8. An apparatus as recited in claim 7, wherein the subpacket verifier is located inside the processing unit.

9. An apparatus as recited in claim 7, wherein the subpacket verifier is further arranged to include a calculation substantially conforming to a polynomial code checksum calculation.

10. An apparatus in a first wireless station of a wireless network, the apparatus comprising:

a processing unit including a wireless transceiver coupled to an antenna, the processing unit arranged to wirelessly transmit a packet, wherein the packet includes a subpacket; and

a check sequence generator coupled to the processing unit, the check sequence generator arranged to generate a check sequence to protect the integrity of the subpacket and to embed the check sequence in an embedding field within the packet,

such that a second wireless station wirelessly receiving a signal corresponding to the packet can verify the integrity of the subpacket at least using the check sequence and, in the case that the subpacket fails the verifying, can reduce power consumption of at least one component in the second wireless station for a time interval,

wherein the packet substantially conforms to one of the variants of the IEEE 802.11 standard, and wherein the time interval is set according to one or more parameters of the packet.

11. An apparatus as recited in claim 10, wherein the check sequence generator is further arranged to include a calculation substantially conforming to a polynomial code checksum calculation.

12. A computer-readable and tangible carrier medium carrying one or more computer readable code segments to instruct one or more processors of a processing system to implement a method in a first wireless station of a wireless network, the method comprising:

wirelessly receiving a signal corresponding to a packet wirelessly transmitted by a second wireless station, wherein the packet includes a subpacket and a check sequence;

verifying the integrity of the subpacket, the verifying at least using the check sequence; and

in the case that the subpacket fails the verifying, reducing the power consumption of at least one component in the first wireless station for a first time interval,

wherein the packet substantially conforms to one of the variants of the IEEE 802.11 standard, and wherein the first time interval is set according to one or more parameters of the packet.

13. A method as recited in claim 12, wherein the wireless network operates according to a wireless network protocol that includes a backoff procedure, and wherein the method further comprises, in the case that the subpacket fails the verifying, carrying out a backoff procedure according to the wireless network protocol.

14. An apparatus in a first wireless station of a wireless network, the apparatus comprising:

means for wirelessly receiving a signal corresponding to a packet wirelessly transmitted by a second wireless station, wherein the packet includes a subpacket and a check sequence;

means for verifying the integrity of the subpacket, the verifying at least using the check sequence; and

means for, in the case that the subpacket fails the verifying, reducing the power consumption of at least one component in the first wireless station for a first time interval,

wherein the packet substantially conforms to one of the variants of the IEEE 802.11 standard, and wherein the time interval is set according to one or more parameters of the packet.