TREA

Automatic Ad-Hoc network creation and coalescing using WPS

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Information

  • Patent Grant
  • 9444874
  • Patent Number
    9,444,874
  • Date Filed
    Monday, May 19, 2014
    10 years ago
  • Date Issued
    Tuesday, September 13, 2016
    7 years ago
Information
Abstract
A device previously configured as a registrar and that has established an independent ad-hoc network is automatically discovered by another device also previously configured as a registrar. To form an ad-hoc wireless network between these two devices, each device periodically enters a scanning mode to scan for and intercept beacons transmitted by the other device. Upon such interception, one of the devices becomes an enrollee in accordance with a predefined condition and in response to a user selected option. Subsequently, the enrollee modifies its beacons to include an attribute, such as the MAC address, associated with the other device. After intercepting the modified beacon, the remaining registrar prompts it user to decide whether to allow the enrollee to join the registrar's network. If the user responds affirmatively, a handshake is performed between the two devices and a subsequent attempt is made by the enrollee to join the registrar's network.
Description

The present application is also related to U.S. application Ser. No. 11/800,166, filed May 4, 2007, entitled “Ad-Hoc Simple Configuration”, commonly assigned, the content of which is incorporated herein by reference in its entirety.


The present application is also related to U.S. application Ser. No. 11/867,665, filed concurrently herewith, entitled “Power Save Mechanisms For Dynamic Ad-Hoc Networks”, commonly assigned, the content of which is incorporated herein by reference in its entirety.


BACKGROUND OF THE INVENTION

The present invention relates to wireless communication networks, and more particularly to a protocol for establishing an ad-hoc wireless fidelity (WiFi) network.


WiFi networks are well known and are being increasingly used to exchange data. One known WiFi standard, commonly referred to as WiFi Protected Setup (WPS) or WiFi Simple Configuration (WSC), is a Wireless Local Area Network (WLAN) standard that defines the communication modes and the associated configuration protocols for an infrastructure WLAN.


There are three logical components in an infrastructure WSC network, namely a registrar, an access point (AP) and an enrollee. Referring to FIG. 1A, to establish a wireless communications link with legacy AP 10, WSC client 12 first seeks to acquire network credentials from external registrar 14 using an 802.11 ad-hoc network. Subsequently, WSC client 12 establishes a link to legacy AP 10 using the network credentials that WSC client 12 has acquired from external registrar 14.


Referring to FIG. 1B, AP 20 is shown as having an embedded registrar. To establish a communications link with AP 20, WSC client 22 first seeks to acquire network credentials from AP 20's embedded registrar over an 802.11 infrastructure network. Subsequently, using the acquired network credentials, WSC client 22 wirelessly connects to AP 20.


Referring to FIG. 1C, to establish a communications link with WSC AP 30, WSC client 32 first seeks to acquire network credentials using an extended authentication protocol (EAP) via WSC AP 30. WSC AP 30 relays the WSC client 32's EAP message to registrar 34 using a Universal Plug and Play (UpnP) protocol. Next, using the acquired network credentials supplied by registrar 34, WSC client 32 establishes a communications link with WSC AP 30. WSC and its communication protocols are described, for example, in Wi-Fi Simple Configuration Specification, Version 1.0a, Feb. 10, 2006, by Wi-Fi Simple Configuration Working Group in the Wi-Fi Alliance.


As electronic devices with wireless network capabilities become more pervasive, it would be desirable to enable two or more of such devices to form an ad-hoc wireless network to exchange data or interact without using an access point. Furthermore, it would be desirable to ensure that such data exchange or interaction is carried out in a user-friendly manner.


BRIEF SUMMARY OF THE INVENTION

In accordance with one embodiment of the present invention, a method of enabling a first device to join an ad-hoc network previously established by a second device includes, in part, placing the first device in a scanning mode during one of each N beacon transmission periods to scan for beacons transmitted by the second device, and prompting a user of the first device to join the ad-hoc network if the first device intercepts a beacon of the second device during the scanning mode. The first and second devices are previously configured as registrars.


The method further includes, in part, modifying beacons of the first device to include an attribute associated with the second device if the user responds affirmatively to the option; and attempting to reconfigure the first device as an enrollee if the user responds affirmatively to the option. The method further includes, in part, modifying beacons of the first device if a condition is satisfied.


In some embodiments, the condition is defined by a comparison of time stamps from ad-hoc beacons associated with the two devices. In other embodiments, the condition is defined by a comparison of media access controller (MAC) addresses of the two devices. In some embodiments, the option is presented via a text displayed on an LCD panel disposed on the first device. In another embodiment, the option is presented via an audible sound played through a speaker disposed on the first device. In some embodiments, the attribute that is included in the modified beacon is the MAC address of the second device. In one embodiment, the first device joins the ad-hoc network previously established by the second device without either of the first and second devices being first powered off.


In accordance with another embodiment of the present invention, a method of adding a first device to an ad-hoc network previously established by a second device includes, in part, placing the second device in a scanning mode during one of each N beacon transmission periods to scan for beacons transmitted by the first device, intercepting a beacon of the first device during one of the scan periods of the second device; verifying whether the intercepted beacon includes an attribute of the second device; and prompting a user with an option to allow the first device to be added to the ad-hoc network if the intercepted beacon includes the attribute. The first and second devices are previously configured as registrars. The method further includes, in part, performing a handshake if the user responds affirmatively to the option.


In one embodiment, the option is presented via a text displayed on an LCD panel disposed on the second device. In another embodiment, the option is presented via an audible sound played on a speaker disposed on the second device. In one embodiment, the attribute is the MAC address of the second device. In one embodiment, the beacons of the first device is modified to include the attribute associated with the second device. In one embodiment, the first device joins the ad-hoc network previously established by the second device without either of the first and second devices being first powered off


A device in accordance with one embodiment of the present invention is adapted to participate in a wireless ad-hoc network session. The device is initially configured to operate as a registrar and is operative to operate in a scanning mode during one of each N beacon transmission periods to scan for beacons transmitted by a second device. The first device is further operative to prompt a user to join the ad-hoc network of the second device if the first device intercepts a beacon of the second device during the scanning mode.


In one embodiment, the first device is further operative to modify its beacons to include an attribute associated with the second device if the user responds affirmatively to the option. If the user responds affirmatively to the option, the first device become an enrollee. In one embodiment, the condition is defined by a comparison of time stamps. In another embodiment, the condition is defined by a comparison of media access controller (MAC) addresses. In one embodiment, the beacons of the first device are modified if a condition is satisfied.


In one embodiment, the first device includes an LCD panel to display the option. In another embodiment, the first device includes a speaker adapted to audibly broadcast the option. In some embodiments, the attribute is the MAC address of the second device. In one embodiment, the first device joins the ad-hoc network previously established by the second device without either of the first and second devices being first powered off.


A device in accordance with another embodiment of the present invention is adapted to be placed in a scanning mode during one of each N beacon transmission periods to scan and intercept beacons transmitted by a second device. The first device is further adapted to verify whether the intercepted beacon includes an attribute of the first device and to prompt a user with an option to allow the second device to be added to the ad-hoc network previously established by the first device. The first device is further adapted to initiate a handshake if the user responds affirmatively to the option.


In one embodiment, the first device includes an LCD panel to display the option. In another embodiment, the first device includes a speaker adapted to audibly broadcast the option. In some embodiments, the attribute is the MAC address of the first device. In one embodiment, the beacons of the first device is modified to include the attribute associated with the second device. In one embodiment, the first device joins the ad-hoc network previously established by the second device without either of the first and second devices being first powered off.


A device in accordance with one embodiment of the present invention includes, in part, means for enabling the device to join an ad-hoc network previously established by a second device, means for placing the first device in a scanning mode during one of each N beacon transmission periods to scan for beacons transmitted by the second device, and means for prompting a user of the first device to join the ad-hoc network if the first device intercepts a beacon of the second device during the scanning mode. The first and second devices are previously configured as registrars.


The device further includes, in part, means for modifying beacons of the first device to include an attribute associated with the second device if the user responds affirmatively to the option; and means for attempting to reconfigure the first device as an enrollee if the user responds affirmatively to the option. The device further includes, in part, means for modifying its beacons if a condition is satisfied.


In some embodiments, the condition is defined by a comparison of time stamps associated with the two devices. In other embodiments, the condition is defined by a comparison of media access controller (MAC) addresses of the two devices. In some embodiments, the option is presented via a text displayed on an LCD panel disposed on the first device. In another embodiment, the option is presented via an audible sound played through a speaker disposed on the first device. In some embodiments, the attribute that is included in the modified beacon is the MAC address of the second device. In one embodiment, the first device joins the ad-hoc network previously established by the second device without either of the first and second devices being first powered off.


A device in accordance with another embodiment of the present invention includes, in part, means for placing the device in a scanning mode during one of each N beacon transmission periods to scan for beacons transmitted by a second device, means for intercepting a beacon of the second device during one of the scan periods of the first device; means for verifying whether the intercepted beacon includes an attribute of the first device; and means for prompting a user with an option to allow the second device to be added to the ad-hoc network of the first device if the intercepted beacon includes the attribute. The first and second devices are previously configured as registrars. The device further includes, in part, means for performing a handshake if the user responds affirmatively to the option.


In one embodiment, the option is presented via a text displayed on an LCD panel disposed on the second device. In another embodiment, the option is presented via an audible sound played on a speaker disposed on the second device. In one embodiment, the attribute is the MAC address of the second device. In one embodiment, the beacons of the first device is modified to include the attribute associated with the second device. In one embodiment, the first device joins the ad-hoc network previously established by the second device without either of the first and second devices being first powered off.


A device in accordance with one embodiment of the present invention includes a device having disposed therein a processor and a medium for storing codes for execution by the processor, the medium including code for placing the first device in a scanning mode during one of each N beacon transmission periods to scan for beacons transmitted by the second device, and code for prompting a user of the first device to join the ad-hoc network if the first device intercepts a beacon of the second device during the scanning mode. The first and second devices are previously configured as registrars.


The medium further includes, in part, code for modifying beacons of the first device to include an attribute associated with the second device if the user responds affirmatively to the option; and code for attempting to reconfigure the first device as an enrollee if the user responds affirmatively to the option. The medium further includes, in part, code for modifying the beacons if a condition is satisfied.


In some embodiments, the condition is defined by a comparison of time stamps associated with the two devices. In other embodiments, the condition is defined by a comparison of media access controller (MAC) addresses of the two devices. In some embodiments, the option is presented via a text displayed on an LCD panel disposed on the first device. In another embodiment, the option is presented via an audible sound played through a speaker disposed on the first device. In some embodiments, the attribute that is included in the modified beacon is the MAC address of the second device. In one embodiment, the first device joins the ad-hoc network previously established by the second device without either of the first and second devices being first powered off.


A device in accordance with one embodiment of the present invention includes a device having disposed therein a processor and a medium for storing code for execution by the processor, the medium including code for placing the device in a scanning mode during one of each N beacon transmission periods to scan for beacons transmitted by a second device, code for intercepting a beacon of the second device during one of the scan periods of the first device; code for verifying whether the intercepted beacon includes an attribute of the first device; and code for prompting a user with an option to allow the second device to be added to the ad-hoc network of the first device if the intercepted beacon includes the attribute. The first and second devices are previously configured as registrars. The device further includes, in part, code for performing a handshake if the user responds affirmatively to the option.


In one embodiment, the option is presented via a text displayed on an LCD panel disposed on the second device. In another embodiment, the option is presented via an audible sound played on a speaker disposed on the second device. In one embodiment, the attribute is the MAC address of the second device. In one embodiment, the beacons of the first device is modified to include the attribute associated with the second device. In one embodiment, the first device joins the ad-hoc network previously established by the second device without either of the first and second devices being first powered off.





BRIEF DESCRIPTION OF THE DRAWINGS


FIGS. 1A-1C show various logical components of a multitude of infrastructure wireless networks.



FIG. 2 shows a pair of wireless devices configured to establish a wireless ad-hoc network.



FIG. 3 shows beacon transmission times associated with the devices shown in FIG. 2.



FIG. 4 shows a pair of devices adapted to form a network after they have been configured as registrars, in accordance with one exemplary embodiment of the present invention.



FIG. 5 shows beacon transmission times as well scanning periods of the devices shown in FIG. 4, in accordance with one exemplary embodiment of the present invention.



FIG. 6 is a flowchart of step carried out to enable a device configured as a registrar to join an ad-hoc network established by another registrar, in accordance with one exemplary embodiment of the present invention.





DETAILED DESCRIPTION OF THE INVENTION

A device previously configured as a registrar and that has established an independent ad-hoc network is automatically discovered by another device also previously configured as a registrar. To form an ad-hoc wireless network between these two devices, each device periodically enters a scanning mode to scan for and intercept beacons transmitted by the other device. Upon such interception, one of the devices becomes an enrollee in accordance with a predefined condition and in response to a user selected option. Subsequently, the enrollee modifies its beacons to include an attribute, such as the MAC address, associated with the other device. After intercepting the modified beacon, the remaining registrar prompts its user to decide whether to allow the enrollee to join the registrar's network. If the user responds affirmatively, a handshake is performed between the two devices and a subsequent attempt is made by the enrollee to join the registrar's network. Although the following description is made with reference to an ad-hoc WSC (WPS) network, it is understood that the present invention applies to any other ad-hoc network, WSC or otherwise.



FIG. 2 shows a pair of devices 40 and 50. Each of these device is assumed to have been previously configured as a conventional registrar and to have established an independent network. Device 40 is shown as having formed network 45, and device 50 is shown as having formed network 55. Assume that their respective users are interested in enabling these two devices to exchange data or otherwise interact with one another. For example, devices 40 and 50 may be digital cameras and their users may be interested in exchanging images, or they may be game consoles and their users may be interested in playing an interactive game. Devices 40 and 50 are typically battery-powered, and therefore it is desirable to control and minimize their battery consumption.


Because devices 40 and 50 are assumed to have been previously configured as registrars, they do not perform enrollee scans to join each other's networks. Each of devices 40 and 50 may be caused to become an enrollee if is turned off and turned back on, as described in copending related U.S. application Ser. No. 11/800,166, filed May 4, 2007, entitled “Ad-Hoc Simple Configuration”. Alternatively, each such device may be adapted to present its respective user with an option of selecting between adopting an enrollee or a registrar mode of operation when the two users physically acknowledge each other's presence and seek to form a network. This would require the two users to negotiate and agree on selecting one of the devices as an enrollee and the other one as a registrar. However, a typical user is unaware of what a registrar or an enrollee is, and may not appreciate choosing between these two options. In other words, the process of establishing a network between such devices would require burdensome and unfriendly user intervention and which is not automated.



FIG. 3 shows beacon transmission times of devices 40 and 50. Following every beacon transmission, each of devices 40 and 50 remains active for a time period ΔT to perform a sniff operation, after which the device goes back to a stand-by mode until the next beacon transmission time arrives. As shown in FIG. 3, the beacons transmission times (BTT) for devices 40 and 50 are shifted with respect to one another such that, for example, when device 40 is active, device 50 is in a stand-by mode and vice versa.


To ensure that devices previously configured as registrars can form a network without burdensome user intervention and without being turned off and on, in accordance with one embodiment of the present invention, each of these devices is modified to periodically wake up from the stand-by mode, also referred to as low-power mode, to enter an enrollee scan mode intercept beacons transmitted by other devices. FIG. 4 shows a pair of devices, 60 and 80 that have been previously configured as registrars, but are adapted, in accordance with one embodiment of the present invention, to form a network 70 to exchange data or interact, as described further below.


Referring to FIG. 5, device 60 is shown as transmitting beacons at periodic times T1, T3, T5, T7, T9, T12, T15, etc, and device 80 is shown as transmitting beacons at periodic times T2, T4, T6, T8, T11, T13, etc. It is understood that, for example, time T2 occurs between times T1 and T3, and, for example, time T10 occurs between times T9 and T11.


In accordance with the present invention, every N beacon periods, where N is configurable, one of the devices enters an enrollee scan mode to intercept the beacons transmitted by other devices. Assume in the example shown in FIG. 5 than N is equal to 3. Assume further that device 60 enters an enrollee scan mode between the times T5 and T7, T12 and T15, etc., and device 80 enters an enrollee scan mode between the times T2 and T4, T8 and T11, etc. Accordingly, between the times T2 and T4, for example, device 80 remains active and does not enter the stand-by mode. Similarly, between the times T5 and T7, for example, device 60 remain active and does not enter the stand-by mode. The period covering two successive beacon transmissions is referred to in the following as scanning period.


During the scanning period that starts at time T2, device 80 remains active to intercept beacons transmitted by other devices. Assume during scanning period P1, i.e., between the times T2 and T4, no other Wi-Fi device, such as device 60, is in the vicinity of or can otherwise have its beacons intercepted by device 80. Accordingly, device 80 transmits a beacon at time T4, and shortly thereafter enters the stand-by mode. Similarly, assume during scanning period P2, i.e., between the times T5 and T7, no other Wi-Fi device, such as device 80, is in the vicinity of or can otherwise have its beacons intercepted by device 60. Accordingly, device 60 transmits a beacon at time T7, and shortly thereafter enters the stand-by mode.


Assume between the times T7 and T8, devices 60 and 80 are brought into proximity of one another such that a beacon transmitted by one of these devices can be intercepted by the other device. At time T8, device 80 wakes up, transmits a beacon and enters a scanning mode for the entire duration of period P3. At time T10, device 80 intercepts the beacon transmitted by device 60 at time T9 and determines that device 60 is in its vicinity. This leads to the discovery of device 60 by device 80.


Once the discovery is successful, one of the devices is selected to become an enrollee and the other device is selected to remain a registrar. Any arbitrary criteria may be used to make this selection. For example, in one embodiment, the device with the earlier time stamp becomes the registrar, while the device with the later time stamp becomes the enrollee. In another embodiment, the device with the larger Media Access Controller (MAC) address becomes the registrar.


Assume that a predefined condition establishes that the device with the later time stamp is to become an enrollee and the device with the earlier time stamp is to remain a registrar. Assume further that device 60 has an earlier time stamp than device 80. Accordingly, when device 80 intercepts the beacon transmitted by device 60 at time T10, the user of device 80 is prompted with an option to decide whether to join device 60's network. This notification may be made via a text displayed on an LCD panel disposed on device 80, or an audible beep played via a speaker disposed on device 80, etc. If the user responds affirmatively to this option, device 80's beacons are modified to include additional information elements. In one embodiment, device 80's beacons are modified to include device 60's MAC address. In other embodiments, device 80's beacons may be modified to include any other attribute associated with device 60. The beacon modification is a way of informing device 60 that device 80 is interested in joining the device 60's network.


At time T11 device 80 transmits its modified beacon. However, because between the times T9 and T12 device 60 is not in a scanning mode, the beacon transmitted at time T11 is not intercepted. Following transmitting its beacon at time T12, device 60 enters into a scanning mode during period P4. At time T14 device 60 intercepts the beacon transmitted by device 80 at time T13. After detecting that the intercepted beacon has device 60's own MAC address, device 60 prompts its user with an option to allow device 80 to joining device 60's network. Such a prompt may be made via a text displayed on an LCD disposed on device 60, or an audible beep played via a speaker disposed on device 80, etc. In other words, a determination by device 60 that the modified beacon transmitted by device 80 includes device 60's MAC address is used, in accordance with one exemplary embodiment, to inform device 60 that device 80 is interested in joining device 60's network.


If the user of device 60 is interested in allowing device 80 to join its network, the user selects one of the options, subsequent to which a handshake is made. After a successful handshake, the independent networks established previously by devices 60 and 80 is coalesced to from network 70 to which both devices 60 and 80 are wirelessly connected.



FIG. 6 is a flowchart 100 of steps carried out by an enrollee to join a registrar's network. During each of N beacon transmission periods, one of the device enters a scanning mode 102 to intercept beacons transmitted by the other device. If a beacon from the registrar has an earlier timestamp (or higher MAC Address) and a matching criteria is detected 104, the enrollee's user is prompted with an option to decide 106 whether it is interested in joining the registrar's network. If the timestamp or MAC address check fails, the scan results are discarded, in which case, the registrar may attempt to become an enrollee and the enrollee may attempt to become a registrar.


A number of different criterion may be used to perform the match. For example, a match may occur when a camera from a vendor detects a camera from the same vendor, or detects a print service, etc. The additional criterion may be an additional Information Element in the beacon. If such as an additional Information Element is not detected, the scan results are discarded.


If the user responds affirmatively to the option, the enrollee beacons are modified 110. After the modified beacon of the enrollee is intercepted by the registrar 112 while the registrar is in the scanning mode, the registrar's user is presented with an option 114 to decide whether he/she is interested in adding the enrollee to the registrar's network. If the user responds affirmatively to this option, a handshake is performed 116 between the two devices and an attempt is made by the enrollee to join the registrar's network 118.


The above embodiments of the present invention are illustrative and not limiting. Various alternatives and equivalents are possible. Other additions, subtractions or modifications are obvious in view of the present disclosure and are intended to fall within the scope of the appended claims.

Claims
  • 1. A method of establishing an ad-hoc network connection between a first device and a second device, wherein the first device is operable in a beacon mode to transmit beacons and a scanning mode to receive beacons, the method comprising: transmitting beacons, with the first device in the beacon mode, wherein beacon periods extend in between each of two consecutive beacon transmissions;during every Nth beacon period, scanning for beacons with the first device in the scanning mode for a scanning period that covers the beacon period, wherein N is an integer greater than one;while operating in the scanning mode during one of the Nth beacon periods, receiving, with the first device, a beacon from the second device;in response to receiving the beacon, determining, with the first device, whether to be configured as an enrollee to join an ad-hoc network established by the second device;in response to determining to be configured as the enrollee, prompting, with the first device, a user of the first device with an option to join the ad-hoc network established by the second device;in response to receiving a user response indicating to be configured as the enrollee, sending, with the first device, a second beacon that includes an attribute of the second device; andin response to determining not to be configured as the enrollee, discarding, with the first device, results of receiving the beacon without prompting the user with the option to loin the ad-hoc network established by the second device.
  • 2. The method of claim 1, further comprising: during each of the beacon periods other than the every Nth beacon period, entering a standby mode, with the first device, wherein the first device does not transmit or scan for beacons in the standby mode.
  • 3. The method of claim 1, wherein the ad-hoc network comprises a first ad-hoc network, the enrollee comprises a first enrollee, and the beacon comprises a first beacon, the method further comprising: after discarding the results of receiving the first beacon, receiving, with the first device in the scanning mode, a third beacon from the second device, wherein the third beacon includes an attribute of the first device that indicates to the first device that the second device wants to join a second ad-hoc network established by the first device.
  • 4. The method of claim 1, further comprising: after every Nth beacon period, switching, with the first device, from the scanning mode back to the beacon mode.
  • 5. The method of claim 1, wherein determining whether to be configured as the enrollee comprises determining, with the first device, whether to change from being configured as a registrar to the enrollee or to maintain being configured as the registrar.
  • 6. A first device configured to participate in a wireless ad-hoc network session with a second device, the first device comprising: a user interface; anda controller circuit in communication with the user interface, the controller circuit configured to:transmit beacons in a beacon mode, wherein beacon periods extend in between each of two consecutive beacon transmissions;during every Nth beacon period, scan for beacons in a scanning mode for a scanning period that covers the beacon period, wherein N is an integer greater than one;while in the scanning mode during one of the Nth beacon periods, receive a beacon from a second device;in response to receipt of the beacon from the second device, determine whether to be configured as an enrollee to join an ad-hoc network established by the second device;in response to a determination to be configured as the enrollee, prompt, via the user interface, a user of the first device with an option to loin the ad-hoc network established by the second device;in response to receipt of a user response indicating to be configured as the enrollee, transmit a second beacon that includes an attribute of the second device; andin response to a determination not to be configured as the enrollee, discard results of receipt of the beacon without a prompt to the user with the option to loin the ad-hoc network established by the second device.
  • 7. The first device of claim 6, wherein the controller circuit is further configured to: during each of the beacon periods other than every Nth beacon period, enter a standby mode, wherein the controller circuit is configured to not transmit or scan for beacons in the standby mode.
  • 8. The first device of claim 6, wherein the ad-hoc network comprises a first ad-hoc network, the enrollee comprises a first enrollee, and the beacon comprises a first beacon, and wherein after the controller circuit discards the results of receipt of the first beacon, the controller circuit is further configured to: receive a third beacon from the second device when operable in the scanning mode, wherein the third beacon includes an attribute of the first device that indicates to the first device that the second device wants to join a second ad-hoc network established by the first device.
  • 9. The first device of claim 6, wherein the controller circuit is further configured to: after every Nth beacon period, switch from the scanning mode back to the beacon mode.
  • 10. The first device of claim 6, wherein prior to the determination of whether to be configured as the enrollee, the first device is configured as a registrar, and wherein the controller circuit is further configured to: change from being configured as the registrar to the enrollee in response a determination to be configured as the enrollee; and maintain configuration as the registrar in response to a determination not to be configured as the enrollee.
  • 11. A method of a first device operating to add a second device to an ad-hoc network established by the first device, the method comprising: transmitting beacons, with the first device in a beacon mode, wherein beacon periods extend in between each of two consecutive beacon transmissions, wherein a first beacon causes (i) the second device to determine whether to be configured as an enrollee to join the ad-hoc network; (ii) a user of the second device to be prompted with an option to loin the ad-hoc network established by the first device in response to determining to be configured as the enrollee; (iii) the second device to send a second beacon that includes an attribute of the first device in response to the second device receiving a user response indicating to be configured as the enrollee, and (iv) the second device to discard results of receiving the first beacon without prompting the user with the option to loin the ad-hoc network established by the first device in response to determining not to be configured as the enrollee;during every Nth beacon period, scanning for beacons, with the first device in a scanning mode, for a scanning period that covers the entire beacon period, wherein N is an integer greater than one;while operating in the scanning mode during one of the Nth beacon periods, receiving, with the first device, the second beacon from the second device; andin response to receiving the second beacon, prompting, with the first device, a user of the first device with an option to decide whether to allow the second device to be added to the ad-hoc network.
  • 12. The method of claim 11, further comprising: during each of the beacon periods other than the every Nth beacon periods, entering a standby mode with the first device, wherein the first device does not transmit or scan for beacons in the standby mode.
  • 13. The method of claim 11 further comprising: switching, with the first device, from the beacon mode to the scanning mode after every Nth beacon transmission.
  • 14. The method of claim 11, wherein the attribute indicates to the first device that the second device wants to join the ad-hoc network established by the first device.
  • 15. The method of claim 11, further comprising: initiating, with the first device, a handshake in response to the user response that indicates that the user wants the second device to be added to the ad-hoc network.
  • 16. A first device adapted to participate in a wireless ad-hoc network session, the first device comprising: a user interface; anda controller circuit in communication with the user interface, the controller circuit configured to:transmit beacons in a beacon mode, wherein beacon periods extend in between each of two consecutive beacon transmissions, wherein a first beacon causes (i) a second device to determine whether to be configured as an enrollee to join the ad-hoc network; (ii) a user of the second device to be prompted with an option to join the ad-hoc network established by the first device in response to determining to be configured as the enrollee; (iii) the second device to send a second beacon that includes an attribute of the first device in response to the second device receiving a user response indicating to be configured as the enrollee, and (iv) the second device to discard results of receiving the first beacon without prompting the user with the option to loin the ad-hoc network established by the first device in response to determining not to be configured as the enrollee;during every Nth beacon period, scan for beacons in a scanning mode for a scanning period that covers the entire beacon period, wherein N is an integer greater than one;while in the scanning mode during one of the Nth beacon periods, receive the second beacon from the second device; andin response to receipt of the beacon, prompt, via the user interface, a user of the first device with an option to allow the second device to be added to an ad-hoc network established by the first device.
  • 17. The first device of claim 16, wherein the controller circuit is further configured to: during each of the beacon periods other than every Nth beacon period, enter a standby mode, wherein the controller circuit is configured to not transmit or scan for beacons in the standby mode.
  • 18. The first device of claim 16, wherein the controller circuit is further configured to: switch from the beacon mode to the scanning mode after every Nth beacon transmission.
  • 19. The first device of claim 16, wherein the attribute indicates to the first device that the second device wants to join the ad-hoc network established by the first device.
  • 20. The first device of claim 16, wherein the controller circuit is further configured to initiate a handshake in response to identification of the user that indicates that the user wants the second device to be added to the ad-hoc network.
CROSS-REFERENCES TO RELATED APPLICATIONS

This application is a continuation application of U.S. Non-Provisional application Ser. No. 11/867,661, filed Oct. 4, 2007 (now U.S. Pat. No. 8,732,315), which claims the benefit of U.S. provisional application No. 60/829,614, filed Oct. 16, 2006. The contents of U.S. Non-Provisional application Ser. No. 11/867,661 (now U.S. Pat. No. 7,732,315) and U.S. Provisional Application No. 60/829,614 are each incorporated by reference in their entirety.

US Referenced Citations (193)
Number Name Date Kind
4959847 Engelke et al. Sep 1990 A
5488693 Houck et al. Jan 1996 A
5738583 Comas et al. Apr 1998 A
5850592 Ramanathan Dec 1998 A
5877701 Nagakura Mar 1999 A
6272120 Alexander Aug 2001 B1
6309301 Sano Oct 2001 B1
6315668 Metke et al. Nov 2001 B1
6453181 Challa et al. Sep 2002 B1
6524189 Rautila Feb 2003 B1
6590928 Haartsen Jul 2003 B1
6600726 Nevo et al. Jul 2003 B1
6662229 Passman et al. Dec 2003 B2
6690935 Calot et al. Feb 2004 B1
6704866 Benayoun et al. Mar 2004 B1
6707801 Hsu Mar 2004 B2
6760587 Holtzman et al. Jul 2004 B2
6785892 Miller et al. Aug 2004 B1
6788675 Yang Sep 2004 B1
6793580 Sinclair et al. Sep 2004 B2
6795701 Baker et al. Sep 2004 B1
6799056 Curley et al. Sep 2004 B2
6859460 Chen Feb 2005 B1
6879570 Choi Apr 2005 B1
6879574 Naghian et al. Apr 2005 B2
6879812 Agrawal et al. Apr 2005 B2
6909705 Lee et al. Jun 2005 B1
6932698 Sprogis Aug 2005 B2
6970726 Takayanagi Nov 2005 B2
6975613 Johansson Dec 2005 B1
6980522 Boyle Dec 2005 B2
7013391 Herle et al. Mar 2006 B2
7072323 Roberts et al. Jul 2006 B2
7073129 Robarts et al. Jul 2006 B1
7095732 Watson, Jr. Aug 2006 B1
7097562 Gagner Aug 2006 B2
7110366 Hulyalkar et al. Sep 2006 B2
7120129 Ayyagari et al. Oct 2006 B2
7120456 Elliot et al. Oct 2006 B1
7158798 Lee et al. Jan 2007 B2
7181544 Vangal et al. Feb 2007 B2
7190961 Burr Mar 2007 B2
7224964 Souissi et al. May 2007 B2
7236772 Botzas Jun 2007 B1
7251235 Wentink Jul 2007 B2
7257721 Chung et al. Aug 2007 B2
7324444 Liang et al. Jan 2008 B1
7347781 Schultz Mar 2008 B2
7400722 Qi et al. Jul 2008 B2
7435179 Ford Oct 2008 B1
7440430 Jagadeesan et al. Oct 2008 B1
7452278 Chen et al. Nov 2008 B2
7457271 Donovan Nov 2008 B2
7496065 Anjum et al. Feb 2009 B2
7505795 Lim et al. Mar 2009 B1
7515897 Suzuki Apr 2009 B2
7616588 Gatta et al. Nov 2009 B2
7729661 Tanaka et al. Jun 2010 B2
7733861 Suga Jun 2010 B2
7899017 Yu et al. Mar 2011 B2
7978647 Anjum et al. Jul 2011 B2
7990903 Nishihara et al. Aug 2011 B2
8073923 Sasaki et al. Dec 2011 B2
8180363 Maekawa et al. May 2012 B2
8321587 Burr Nov 2012 B2
8787988 Wentink Jul 2014 B2
20010055950 Davies et al. Dec 2001 A1
20020013784 Swanson Jan 2002 A1
20020061743 Hutcheson et al. May 2002 A1
20020091790 Cubley Jul 2002 A1
20020103019 Emmerson Aug 2002 A1
20020107985 Hwang et al. Aug 2002 A1
20020147044 Jakobsson et al. Oct 2002 A1
20020151366 Walker et al. Oct 2002 A1
20020159401 Boger Oct 2002 A1
20020176366 Ayyagari et al. Nov 2002 A1
20020191560 Chen et al. Dec 2002 A1
20020191573 Whitehill et al. Dec 2002 A1
20020199124 Adkisson Dec 2002 A1
20030023761 Jeansonne et al. Jan 2003 A1
20030041150 Passman Feb 2003 A1
20030069018 Matta et al. Apr 2003 A1
20030078062 Burr Apr 2003 A1
20030084337 Simionescu et al. May 2003 A1
20030099212 Anjum et al. May 2003 A1
20030163579 Knauerhase et al. Aug 2003 A1
20030182454 Huth et al. Sep 2003 A1
20030224855 Cunningham Dec 2003 A1
20030231189 Williams Dec 2003 A1
20030231625 Calvignac et al. Dec 2003 A1
20040066751 Tseng et al. Apr 2004 A1
20040078372 Huuskonen Apr 2004 A1
20040081110 Koskimies Apr 2004 A1
20040082383 Muncaster et al. Apr 2004 A1
20040105415 Fujiwara et al. Jun 2004 A1
20040110563 Tanaka et al. Jun 2004 A1
20040127277 Walker et al. Jul 2004 A1
20040127289 Davis et al. Jul 2004 A1
20040139159 Ricciardi et al. Jul 2004 A1
20040146022 Lewis et al. Jul 2004 A1
20040174829 Ayyagari Sep 2004 A1
20040185851 Nagai Sep 2004 A1
20040196808 Chaskar et al. Oct 2004 A1
20040259542 Vitamaki et al. Dec 2004 A1
20050032577 Blackburn et al. Feb 2005 A1
20050041660 Pennec et al. Feb 2005 A1
20050073980 Thomson et al. Apr 2005 A1
20050088980 Olkkonen et al. Apr 2005 A1
20050099977 Williams et al. May 2005 A1
20050122940 Nian Jun 2005 A1
20050129055 Hall et al. Jun 2005 A1
20050138462 Hunt et al. Jun 2005 A1
20050157661 Cho Jul 2005 A1
20050177639 Reunamäki et al. Aug 2005 A1
20050181872 Acharya et al. Aug 2005 A1
20050197189 Schultz Sep 2005 A1
20050221897 Oe Oct 2005 A1
20050250487 Miwa et al. Nov 2005 A1
20050250497 Ghosh et al. Nov 2005 A1
20050268003 Wang et al. Dec 2005 A1
20050268151 Hunt et al. Dec 2005 A1
20050286456 McNew et al. Dec 2005 A1
20050286464 Saadawi et al. Dec 2005 A1
20050286480 Akiyama Dec 2005 A1
20060013160 Haartsen Jan 2006 A1
20060039341 Ptasinski et al. Feb 2006 A1
20060041750 Carter et al. Feb 2006 A1
20060045138 Black et al. Mar 2006 A1
20060046709 Krumm et al. Mar 2006 A1
20060056378 Sugaya Mar 2006 A1
20060062220 Suga Mar 2006 A1
20060095290 Chernev May 2006 A1
20060106963 Sasaki et al. May 2006 A1
20060135261 Kinne et al. Jun 2006 A1
20060135262 Kennedy et al. Jun 2006 A1
20060153156 Wentink et al. Jul 2006 A1
20060154710 Serafat Jul 2006 A1
20060166740 Sufuentes Jul 2006 A1
20060179322 Bennett et al. Aug 2006 A1
20060205409 Chiou et al. Sep 2006 A1
20060221856 Quiroz Oct 2006 A1
20060221858 Switzer Oct 2006 A1
20060221915 Gatta et al. Oct 2006 A1
20060246947 Fujii et al. Nov 2006 A1
20060251004 Zhong et al. Nov 2006 A1
20060259632 Crawford et al. Nov 2006 A1
20060282541 Hiroki Dec 2006 A1
20060287099 Shaw et al. Dec 2006 A1
20070030116 Feher Feb 2007 A1
20070030824 Ribaudo et al. Feb 2007 A1
20070047547 Conner et al. Mar 2007 A1
20070060355 Amaitis et al. Mar 2007 A1
20070060358 Amaitis et al. Mar 2007 A1
20070086394 Yamada et al. Apr 2007 A1
20070086424 Calcev Apr 2007 A1
20070099703 Terebilo May 2007 A1
20070105548 Mohan et al. May 2007 A1
20070141988 Kuehnel et al. Jun 2007 A1
20070147317 Smith Jun 2007 A1
20070155505 Huomo Jul 2007 A1
20070171882 Lee Jul 2007 A1
20070190494 Rosenberg Aug 2007 A1
20070202890 Feher Aug 2007 A1
20070202910 Brewer et al. Aug 2007 A1
20070265018 Feher Nov 2007 A1
20070291761 Kauniskangas et al. Dec 2007 A1
20080013487 Molteni et al. Jan 2008 A1
20080019522 Proctor Jan 2008 A1
20080037444 Chhabra Feb 2008 A1
20080037495 Anjum et al. Feb 2008 A1
20080039015 Nakata et al. Feb 2008 A1
20080043868 Feher Feb 2008 A1
20080069105 Costa et al. Mar 2008 A1
20080095112 Wiemann et al. Apr 2008 A1
20080096662 Kuwahara et al. Apr 2008 A1
20080108437 Kaarela et al. May 2008 A1
20080146337 Halonen et al. Jun 2008 A1
20080146343 Sullivan et al. Jun 2008 A1
20080164984 Sheffer Jul 2008 A1
20080167865 Yamanashi et al. Jul 2008 A1
20080172491 Chhabra et al. Jul 2008 A1
20080220878 Michaelis Sep 2008 A1
20090011834 Chhabra Jan 2009 A1
20090048024 Tanaka et al. Feb 2009 A1
20090092060 Goto Apr 2009 A1
20090180441 Ikeda Jul 2009 A1
20090191878 Hedqvist et al. Jul 2009 A1
20090210531 Melnikov Aug 2009 A1
20090279506 Sinnreich et al. Nov 2009 A1
20100087240 Egozy et al. Apr 2010 A1
20100278077 Reunamaki Nov 2010 A1
20120072485 Hutcheson et al. Mar 2012 A1
20120329554 Mgrdechian et al. Dec 2012 A1
Foreign Referenced Citations (16)
Number Date Country
1375772 Oct 2002 CN
1522503 Aug 2004 CN
1842000 Oct 2006 CN
1 622 319 Feb 2006 EP
2004-136009 Oct 2002 JP
2004-141225 Oct 2002 JP
2003-289277 Oct 2003 JP
2004-135778 May 2004 JP
2006-086959 Sep 2004 JP
2006-050020 Feb 2006 JP
2006-148448 Jun 2006 JP
2006-148488 Jun 2006 JP
03003610 Jun 2002 WO
WO 2004062198 Jul 2004 WO
WO 2005011203 Feb 2005 WO
WO 2005076543 Aug 2005 WO
Non-Patent Literature Citations (61)
Entry
U.S. Appl. No. 11/867,665, “Power Save Mechanisms for Dynamic AD-HOC Networks,” Kopikare et al., filed Oct. 4, 2007, 43 pages.
Extended European Search Report in corresponding European Application No. 07853857.6, dated Nov. 28, 2013, 9 pages.
International Search Report for corresponding PCT Application No. PCT/US2007/080733 mailed Sep. 9, 2008.
Written Opinion for corresponding PCT Application No. PCT/US2007/08733 mailed Sep. 9, 2008.
Notification Concerning Transmittal of International Preliminary Report on Patentability for corresponding PCT Application No. PCT/US2007/080733 mailed Apr. 30, 2009.
Chinese Office Action issued in Chinese Application No. 200780038678.7, dated Sep. 13, 2010 (17 pages including translation).
Chinese Office Action dated Jul. 8, 2010 for Application No. 200780037626.8 (11 pages).
International Search Report for PCT Application No. PCT/US07/17529, mailed Oct. 1, 2008 (1 page).
Lortz et al., “Wi-Fi Simple Config Specification”, Wi-Fi Alliance Confidential, Version 1.0a, Feb. 10, 2006 (107 pages).
Office Action issued in U.S. Appl. No. 11/800,166, mailed Jun. 25, 2009 (27 pages).
Office Action issued in U.S. Appl. No. 11/800,166, mailed Feb. 24, 2010 (30 pages).
Office Action issued in U.S. Appl. No. 11/800,166, mailed Aug. 19, 2010 (32 pages).
Office Action issued in U.S. Appl. No. 11/800,166, mailed Mar. 29, 2011 (29 pages).
Office Action issued in U.S. Appl. No. 11/867,665, mailed Nov. 23, 2010 (6 pages).
Notice of Allowance issued in U.S. Appl. No. 11/867,665, mailed Feb. 28, 2011 (8 pages).
Written Opinion of the International Searching Authority for PCT Application No. PCT/US07/17529, mailed Oct. 1, 2008 (5 pages).
IEEE, “Further Higher-Speed Physical Layer Extension in the 2.4 GHz Band”, IEEE, Draft Std 802.11g-2002, New York, NY, May 2002, Downloaded from the Internet (47 pages).
IEEE, “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, Amendment 2: Higher-speed Physical Layer (PHY) extension in the 2.4 GHz band”, IEEE Std 802.11b-1999/Cor 1-2001, New York, NY, Nov. 7, 2001, Downloaded from the Internet (23 pages).
IEEE, “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, Amendment 5: Spectrum and Transmit Power Management Extensions in the 5 GHz band in Europe”, IEEE Std 802.11h-2003, New York, NY, Oct. 14, 2003, Downloaded from the Internet (75 pages).
IEEE, “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, Amendment 6: Medium Access Control (MAC) Security Enhancements”, IEEE Std 802.11i-2004, New York, NY, Jul. 23, 2004, Downloaded from the Internet (190 pages).
IEEE, “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, Amendment 7: Medium Access Control (MAC) Quality of Service (QoS) Enhancements”, IEEE P802.11e/D11.0, New York, NY, Oct. 2004, Downloaded from the Internet (195 pages).
IEEE, “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Further Higher Data Rate Extension in the 2.4 GHz Band”, IEEE P802.11g/D8.2, New York, NY, Apr. 2003, Downloaded from the Internet (69 pages).
IEEE, “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: High-speed Physical Layer in the 5 Ghz Band”, IEEE Std 802.11a-1999, New York, NY, Dec. 30, 1999, Downloaded from the Internet (91 pages).
IEEE, “Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Higher-Speed Physical Layer Extension in the 2.4 GHz Band”, IEEE Std 802.11b-1999, New York, NY, Jan. 20, 2000, Downloaded from the Internet (96 pages).
IEEE, “TGn Sync Proposal Technical Specification-Abstract,” IEEE 802.11-04/0889r6, Mujtaba, Syed Aon, Agere Systems, Allentown, PA, May 18, 2005, Downloaded from the Internet (131 pages).
U.S. Appl. No. 11/867,665, filed Oct. 4, 2007, Kopikare, Rahul et al., entitled “Power Save Mechanisms for Dynamic AD-HOC Networks” (43 pages).
U.S. Appl. No. 11/924,431, filed Oct. 25, 2007, Kopikare, et al., entitled “System and Method for Gaming in an AD-HOC Network” (32 pages).
Office Action issued in U.S. Appl. No. 11/924,431, mailed Apr. 12, 2011 (10 pages).
Office Action issued in U.S. Appl. No. 11/924,431, dated Oct. 17, 2011 (14 pages).
Office Action issued in U.S. Appl. No. 12/167,804, dated Sep. 2, 2011 (8 pages).
Office Action issued in Chinese patent application No. 200780038678.7, issued Oct. 18, 2011 (16 pages, including English translation).
Office Action issued in U.S. Appl. No. 11/800,166, dated Nov. 3, 2011 (37 pages).
Hirano Aya, “Introductory Techniques for Current Wireless LAN,” Nikkei network vol. 67, Japan Nikkei BP, Nikkei Business Publications, Inc., 2005, (see also English translation of Summary of Japanese Office Action dated Nov. 29, 2011).
Japanese Office Action dated Nov. 29, 2011 for Japanese Patent Application No. 2009-523819, including English translation of Summary of Japanese Office Action.
Japanese Office Action dated Feb. 7, 2012 for Japanese Patent Application No. 2009-532521, including English translation of Summary of Japanese Office Action.
U.S. Appl. No. 11/800,166, “AD-HOC Simple Configuration,” Kapil Chhabra, filed May 4, 2007, 34 pages.
U.S. Appl. No. 12/167,804, “Location Aware AD-HOC Gaming,” Kapil Chhabra, filed Jul. 3, 2008, 22 pages.
International Search Report for corresponding PCT Application No. PCT/US2008/069185, mailed Sep. 3, 2008, 1 page.
Written Opinion for corresponding PCT Application No. PCT/US2008/069185, mailed Sep. 3, 2008, 1 page.
Office Action issued in U.S. App. No. 11/542,393, mailed Nov. 9, 2009, 28 pages.
Office Action issued in U.S. Appl. No. 11/542,393, mailed Apr. 9, 2010, 30 pages.
Office Action issued in U.S. Appl. No. 11/867,661, mailed Jun. 11, 2010, 28 pages.
Office Action issued in U.S. Appl. No. 11/542,393, mailed Aug. 5, 2010, 45 pages.
Office Action issued in U.S. Appl. No. 11/542,393, mailed Apr. 13, 2011, 98 pages.
Notice of Allowance issued in U.S. Appl. No. 11/867,665, mailed Sep. 2, 2011, 11 pages.
Office Action issued in U.S. Appl. No. 12/167,804, mailed Dec. 22, 2011, 14 pages.
Notice of Allowance issued in U.S. Application No. 11/867,665, mailed Feb. 10, 2012, 11 pages.
Office Action issued in U.S. Appl. No. 11/800,166, mailed Apr. 20, 2012, 47 pages.
Third Office Action issued in Chinese Application No. 200780038678.7, dated Apr. 28, 2012, 2 pages, English language translation.
Notice of Allowance issued in U.S. Appl. No. 11/542,393, mailed May 14, 2012, 45 pages.
Office Action issued in U.S. Appl. No. 12/167,804, mailed May 23, 2012, 15 pages.
Notice of Allowance issued in U.S. Appl. No. 11/800,166, mailed Aug. 14, 2012, 19 pages.
Office Action issued in Japanese Application No. 2009-532521, dated Sep. 18, 2012, 3 pages, English language summary and translation.
Notice of Allowance issued in U.S. Appl. No. 12/167,804, mailed Sep. 26, 2012, 16 pages.
Office Action issued in U.S. Appl. No. 11/924,431, mailed Nov. 26, 2012, 27 pages.
Office Action issued in Japanese Application No. 2009-532521, English Translation, dated Jan. 15, 2013, 5 pages.
Notice of Allowance issued in U.S. Appl. No. 11/800,166, mailed Feb. 22, 2013, 6 pages.
Notice of Allowance issued in U.S. Appl. No. 12/167,804, mailed Mar. 19, 2013, 15 pages.
Notice of Allowance issued in U.S. Appl. No. 11/800,166, mailed May 21, 2013, 7 pages.
Lety, Emmanuel et al., “MiMaze, a 3D Multi-Player Game on the Internet,” Proc. of the 4th International Conference of VSMM (Virtual Systems and MultiMedia), Gifu, Japan, 1998, 6 pages.
Zander, Sebastian et al., “Achieving Fairness in Multiplayer Network Games through Automated Latency Balancing,” ACE 2005, Proceedings of the 2005 ACM SIGCHI International Conference on Advances in Computer Entertainment Technology, Valencia, Spain, 2005, pp. 117-124.
Related Publications (1)
Number Date Country
20140258550 A1 Sep 2014 US
Provisional Applications (1)
Number Date Country
60829614 Oct 2006 US
Continuations (1)
Number Date Country
Parent 11867661 Oct 2007 US
Child 14281317 US