Using duration field in beacon to reserve channel time subsequent to beacon

1. A method for transmitting network information for a wireless network, the method comprising:

determining, at a communication device, a length of a time period corresponding to reserving a communication channel, the length of the time period exceeding the length of a beacon frame;

generating, at the communication device, a beacon frame, the beacon frame having a duration field that is for indicating a duration of the beacon frame;

setting, at the communication device, the duration field to a value corresponding to the length of the time period in order to reserve the communication channel for the time period for use by the communication device, the length of the time period exceeding the length of the beacon frame and also exceeding a maximum transmit opportunity length; and

transmitting, by the communication device, the beacon frame.

2. The method of claim 1 , wherein the determined length of the time period must be less than a percentage of a beacon interval.

3. The method of claim 1 , wherein determining the length of the time period comprises dividing a beacon interval by a product of a number of discovered stations and a weight.

4. The method of claim 3 , wherein the weight equals one.

5. An apparatus, comprising:

a network interface device having one or more integrated circuits configured to

determine a length of a time period corresponding to reserving a communication channel, the length of the time period exceeding the length of a beacon frame,

generate a beacon frame, the beacon frame having a duration field that is for indicating a duration of the beacon frame,

set the duration field to a value corresponding to the length of the time period in order to reserve the communication channel for the time period for use by the communication device, the length of the time period exceeding the length of the beacon frame and also exceeding a maximum transmit opportunity length, and

cause the beacon frame to be transmitted by a communication device that includes the network interface device.

6. The apparatus of claim 5 , wherein the determined length of the time period must be less than a percentage of a beacon interval.

7. The apparatus of claim 5 , wherein the network interface is configured to determine the length of the time period at least by dividing a beacon interval by a product of a number of discovered stations and a weight.

8. The apparatus of claim 7 , wherein the weight equals one.

9. A method for transmitting network information for a wireless network, the method comprising:

receiving, at an access point device, a probe request that includes an identifier of a station in a signal field of a physical layer (PHY) header, wherein

the probe request comprises a null data packet (NDP), and

the probe request was sent from the station to the access point device;

generating, at the access point device, a probe response addressed to the station, the probe response being in response to the probe request;

transmitting, by the access point device, the probe response to the station; and

in response to determining that an acknowledgment of the probe response has not been received from the station, retransmitting the probe response.

10. The method of claim 9 , further comprising determining a backoff time period;

wherein the probe response is retransmitted after the backoff time period.

11. An apparatus, comprising:

a network interface having one or more integrated circuits configured to:

receive a probe request having an identifier of a station in a signal field of a physical layer (PHY) header, wherein

the probe request comprises a null data packet (NDP), and

the probe request was sent from the station to the access point device;

wherein the one or more integrated circuits are further configured to

generate, in response to the probe request, a probe response addressed to the station,

cause a communication device that includes the network interface to transmit the probe response to the station, and

in response to determining that an acknowledgment of the probe response has not been received from the station, cause the communication device to retransmit the probe response.

12. The apparatus of claim 11 , wherein the network interface is configured to:

determine a backoff time period, and

retransmit the probe response after the backoff time period.

13. A method for receiving network information for a wireless network, the method comprising:

generating, at a communication device, a probe request that includes an identifier of the communication device in a signal field of a physical layer (PHY) header, wherein the probe request comprises a null data packet (NDP);

transmitting, with the communication device, the probe request to an access point;

receiving, at the communication device, a probe response from the access point addressed to the communication device, the probe response being in response to the probe request;

transmitting, by the communication device, an acknowledgment of the probe response.

14. An apparatus, comprising:

a network interface having one or more integrated circuits configured to:

generate a probe request that includes an identifier of a communication device in a signal field of a physical layer (PHY) header, wherein the probe request comprises a null data packet (NDP),

cause a communication device that includes the network interface to transmit the probe request to an access point, and

in response to the communication device receiving a probe response addressed to the communication device, the probe response having been transmitted by the access point in response to the probe request, cause the communication device to transmit an acknowledgment of the probe response to the access point.