US20080072292A1 - Secure device introduction with capabilities assessment - Google Patents
Secure device introduction with capabilities assessment Download PDFInfo
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- US20080072292A1 US20080072292A1 US11/514,452 US51445206A US2008072292A1 US 20080072292 A1 US20080072292 A1 US 20080072292A1 US 51445206 A US51445206 A US 51445206A US 2008072292 A1 US2008072292 A1 US 2008072292A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2803—Home automation networks
- H04L12/2807—Exchanging configuration information on appliance services in a home automation network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2803—Home automation networks
- H04L12/2816—Controlling appliance services of a home automation network by calling their functionalities
- H04L12/2821—Avoiding conflicts related to the use of home appliances
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2803—Home automation networks
- H04L12/2838—Distribution of signals within a home automation network, e.g. involving splitting/multiplexing signals to/from different paths
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/06—Network architectures or network communication protocols for network security for supporting key management in a packet data network
- H04L63/061—Network architectures or network communication protocols for network security for supporting key management in a packet data network for key exchange, e.g. in peer-to-peer networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/18—Network architectures or network communication protocols for network security using different networks or channels, e.g. using out of band channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/102—Gateways
- H04L65/1023—Media gateways
- H04L65/1026—Media gateways at the edge
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1073—Registration or de-registration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1083—In-session procedures
- H04L65/1094—Inter-user-equipment sessions transfer or sharing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
- H04W12/043—Key management, e.g. using generic bootstrapping architecture [GBA] using a trusted network node as an anchor
- H04W12/0431—Key distribution or pre-distribution; Key agreement
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/06—Authentication
- H04W12/069—Authentication using certificates or pre-shared keys
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/0823—Network architectures or network communication protocols for network security for authentication of entities using certificates
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Definitions
- the invention generally relates to securely introducing devices into an environment, and more particularly to establishing relationships between, managing data communication with, and restricting resource access of devices introduced into an environment.
- Wired and wireless communication between computing devices has enjoyed wide adoption and significant growth as a flexible and cost-effective infrastructure has become available.
- gigabit Ethernet and wireless technology such as WiFi (a common name for several related standards proposed by the Institute of Electrical and Electronics Engineers, “IEEE”), Bluetooth, infrared coded data, etc. permit data transfer via wireless signals or fast wired data pathways.
- IEEE Institute of Electrical and Electronics Engineers
- bandwidth management or allocation which may be an issue when, as often happens, multiple devices in an environment are engaging in a common task with devices outside the environment.
- An example would be multiple devices engaging in a data download, peer-to-peer data transfer, conferencing or telephony communication session, etc.
- Another issue is establishing trust and identity between various devices, such as conference participants.
- Yet another issue is determining a proper scope of rights in the environment for visiting devices.
- FIG. 1 shows an exemplary network environment according to an embodiment of the invention.
- FIG. 2 is a flow chart of an exemplary protocol transaction according to an embodiment of the invention.
- FIG. 3 illustrates, according to one embodiment, a framework for establishing initial trust relationships between devices and communicating these trust relationships.
- FIG. 4 illustrates a flowchart according to one embodiment for introducing devices into an environment.
- FIG. 5 illustrate two different but common device configurations that may be found in a personal or commercial networked environment such as a Digital Home or Office LAN environment.
- FIG. 6 illustrates a system of devices that may operate in accord with various embodiments of the invention.
- FIG. 7 illustrates a suitable computing environment in which certain aspects of the invention may be implemented.
- Another issue is minimizing bandwidth requirements when multiple devices within an environment may be engaging in a common task and hence it may be beneficial to aggregate communication into a common communication in to or out of the environment.
- Another issue smart bandwidth allocation so low bandwidth devices are recognized as such and are not unnecessarily provided bandwidth to the detriment of other high-bandwidth devices.
- Other issues are addressed herein as well and will become apparent from the following description.
- devices may transfer credentials within the environment, and while doing so, a device may also communicate it capabilities and resource requirements to facilitate configuring the device for use within the environment. Credentials may be passwords or encryption keys required to obtain access to network resources, or other configuration information useful or necessary to operate the device.
- credentials may be passwords or encryption keys required to obtain access to network resources, or other configuration information useful or necessary to operate the device.
- Capabilities and requirements provided by the device may be used to facilitate coordinating efficient communication between devices within an environment with devices outside the environment, such as aggregating overlapping communication sessions into a single common session between the environment and external communication end points, as well as to facilitate smart bandwidth allocation through transcoding data sent to a device, as well as segregating some devices to limit their access (as desired) to resources of the environment, etc.
- FIG. 1 illustrates an environment 100 including an Access point (“AP”) 102 that is a central element in many WLANs since may communicate with one or more stations 104 , 106 that use the wireless network, and may copy data packets to or from a traditional wired network 108 so that stations 104 and 106 can communicate with devices such as server 110 that lack a wireless interface.
- WEP Wi-Fi Protected Access
- Wi-Fi Protected Access Wi-Fi Protected Access
- IEEE 802.11i Wi-Fi Protected Access
- devices of the environment 100 may be engaging in any sort of network activity, such as client devices accessing network data on the Internet, an intranet, etc., streaming video feeds, participating in video and/or data conferences, downloading, etc.
- the user of a device such as laptop WLAN client 114 wishes to use the wireless network through AP 102 to access resources on other wireless or wired nodes, it must obtain a valid encryption key and enter it into the wireless device's configuration.
- an administrator of the wireless network would provide the key and the user would type it into a configuration form.
- this approach is inconvenient for the user and cumbersome for the administrator.
- an unauthorized user may obtain a copy of the key from the user and use it to access the network. Changing the WLAN configuration to exclude such an unauthorized user may entail re-configuring all of the other authorized devices.
- An alternate method of managing WLAN access may use a registration protocol according to an embodiment of the invention.
- a protocol may be used allowing WLAN client 114 to register with a network entity called a Registrar 116 by way of communication through AP 102 .
- the Registrar may be integrated with the AP, and yet other embodiments may use several Registrars.
- there may also be a Media Gateway Device (MGD), which may be a standalone device or, as assumed in the illustrated embodiment, incorporated within the Registrar.
- MGW Device Media Gateway Device
- the MGD may be configured to perform various tasks, such as coordinating communication for multiple devices within the environment be engaging in a common communication task, such as a video conference, with devices outside the environment, such as with devices on the Internet, or transcoding content to provide compatibility or reducing bandwidth, or to block out attempts by a device to access communication features not authorized for the device within the environment.
- a common communication task such as a video conference
- devices outside the environment such as with devices on the Internet
- transcoding content to provide compatibility or reducing bandwidth
- device introduction into a new environment may utilize a relatively secure Out-Of-Band (OOB) channel to initially transfer data from an existing device, such as a Registrar or other device in the environment to a new device being introduced.
- This data may, for example, be used to at least temporarily establish a secure communication channel over which the new device may subsequently be configured.
- An Application Framework implementing the registration protocol may be used to provide a common framework for new device configuration.
- application software for a device registers with the Application Framework, and the framework coordinates with the Registrar (or other existing device) and the new device to automatically configure the new device when it is introduced.
- Registrar 116 may communicate with AP 102 over the wired network 108 , over a wireless (radio) connection, or both.
- the Registrar may provide administrative facilities to monitor the WLAN and manage encryption keys.
- a New WLAN client 114 has an associated secret called a device password which can be used as the OOB data to transfer for establishing the secure communication channel.
- the password may be engraved on the device or printed on a label, or may be displayed by the device or by software associated with the device. If the device password is displayed in this way, it may be dynamic (for example, the displayed password may be valid for a period of time or until some event occurs, then a new device password may be chosen and displayed).
- the device password may be readable by a reader device near the new client.
- NFC Near Field Communication
- NFC Near Field Communication
- the new WLAN client might be equipped with an infrared or other light signal transmitter, and be able to transmit the device password to an optical receiver of the Registrar within line-of-sight proximity.
- These and other known techniques may be used to perform an OOB data transfer between the new device and the existing device in the environment, e.g., the Registrar, to facilitate establishing the secure communication channel.
- an in-band communication channel can be (or already is) compromised.
- a typical example of a high-risk in-band channel is a public wireless “hotspot,” e.g., a place providing public network access, or a hotel room network connection.
- an initial OOB data transfer with the new device is performed to bootstrap establishing a secure communication channel over which to then configure the new device. For example, assuming the OOB data contains cryptosystem data, the new device and Registrar, or other existing device, proxy, etc., use the cryptosystem data to establish a secure communication channel with the new device.
- the new device may request a Registrar, Framework Protocol Stack (see, e.g., the FIG. 4 embodiment) or other entity or programmatic construct to act as a certificate authority (CA) for cryptographic, e.g., X.509, type certificates.
- CA certificate authority
- FIG. 2 illustrates a flow chart 200 according to one embodiment to securely transfer a credential such as a WEP key from the Registrar to the client.
- Registrar 116 , AP 102 and client 114 can interact according to FIG. 2 .
- All messages can be sent in-band (for example, over the wireless communication channel), or some messages can be sent over a different channel.
- the embodiment described with reference to this figure uses the Extensible Authentication Protocol (“EAP”), as described in the Internet Engineering Task Force (“IETF”) Request for Comments (“RFC”) number 3748 dated June 2004, as a framework for transmitting and receiving many of the messages in the protocol.
- EAP Extensible Authentication Protocol
- IETF Internet Engineering Task Force
- RRC Request for Comments
- messages according to embodiments of the invention can be used with other communication frameworks, or transmitted as raw data over any sort of communication channel.
- FIG. 2 discussion is of a high level and for clarity in presentation some encryption details have been left out.
- the client's device password is provided to the Registrar 202 . This may be accomplished by reading the password from the client's label or display and entering it through a Registrar user interface, by placing the client near the Registrar so that the Registrar can read the client's NFC token automatically, or via some other OOB method.
- the client transmits a first message (“M 1 ”) (encapsulated within an EAP message) to initiate the introduction protocol with the Registrar.
- M 1 contains a first random number N 1 and a public key PK E of the client, and may contain other information (described below). M 1 is received by the Registrar 206 .
- the Registrar responds to M 1 by transmitting a second message (“M 2 ”) containing a second random number N 2 and a public key PK R of the Registrar 208 .
- the client receives M 2 210 .
- the transaction continues with the client transmitting a message Mn 212 and the Registrar responding with message Mn+1 214 .
- Portions of each message may be encrypted with a key known to both the client and the Registrar, or with a public or private key of one of the parties.
- Messages may have appended a message authentication code (“HMAC”), containing a cryptographic hash of the previous message and a portion of the current message preceding the MAC, to permit the recipient to verify that the other party correctly received the previous message and that no third party is tampering with the messages in transit.
- HMAC message authentication code
- the key used to compute the HMAC in one or more of the messages from the Registrar is authenticated using a device password that should match the client's own device password. This permits the client to verify that it is receiving credentials from an authorized Registrar (and not, for example, from a rogue Registrar that is attempting to trick the client into connecting to a hostile wireless network).
- One or more of the messages from the Registrar contains a credential such as a WEP or WPA key that the client can use to access the wireless LAN through the AP.
- the credential may be encrypted with a key-encryption key to prevent its recovery by an eavesdropper.
- the client When the client receives the message containing the credential, it verifies the HMAC to ensure the message came from a Registrar with knowledge of its own device password 216 , e.g., in one embodiment a test is performed to ensure mutually proved knowledge of the device password was received. If the passwords differ, the client aborts the EAP transaction by transmitting a negative acknowledge (“NACK”) message 218 . If the HMAC correctly verifies knowledge of the device password, the client may decrypt the credential and store it in a configuration database for future use 220 .
- NACK negative acknowledge
- the session is terminated. For example, this may be performed by transmitting a “Done” response to the Registrar 222 , which receives the “Done” message 224 and responds with an EAP “Fail” message 226 .
- the client subsequently receives the “Fail” message 228 .
- the failure message does not mean that the client must repeat the EAP transaction to obtain a credential. It merely indicates that the transaction was used to provision a credential rather than to grant the client immediate use of the wireless LAN.
- the client may use the credential it received later, when it attempts to access the network through the AP 230 . For example, the client may update its configuration according to data in the credential, or may use the credential to complete a new authentication protocol transaction designed to provide network access.
- configuring communication parameters and communication configurations for the devices may also be performed. For example, by establishing trust between the devices and a registrar, credentials may be exchanged between the devices to facilitate establishing trust between the devices. Or, bandwidth requirements for devices may be configured to control device inter-communication as well as communication to locations external to the environment.
- FIG. 3 illustrates, according to one embodiment, a framework 300 for establishing initial trust relationships between devices and communicating these trust relationships, e.g., between various operating system, device driver, and application software components.
- an Application Framework 302 is built on device introduction mechanisms, such as those described above with respect to FIGS. 1-2 .
- the Application Framework is initialized after sending the Done message and before responding with the Fail message and terminating the EAP session.
- the illustrated Application Framework may be used by any application or device to bootstrap a secure communication channel.
- device discovery techniques such as wireless or wired network discovery data probes, Universal Plug and Play (UPnP) operations, or other discovery techniques may be used to announce a new device's presence in an environment, locate Registrars or other devices of the environment, and manage networked devices.
- An Application Programming Interface (API) or Software Development Kit (SDK) may also be defined to provide functions to perform the operations and techniques discussed herein for discovering, registering and configuring devices within an environment.
- the below line 304 components 306 - 312 may be standardized or become well-defined by a Specification, such as described in the “Wi-Fi Simple Config Proposal”, the most current version at this time being Revision 1.0a dated Feb. 10, 2006.
- Below the line 304 components 306 - 312 include an In-Band media manager 306 for managing a conventional communication connections such as a Bluetooth link, an Institute of Electrical and Electronics Engineers (IEEE) 802.x type of WLAN link, etc. It is presumed this in-band communication channel is susceptible to attack.
- IEEE Institute of Electrical and Electronics Engineers
- OOB media manager 308 for managing OOB communication channels, such as the various exemplary communication channels discussed above.
- OOB communication channel is presumed difficult to attack and hence is therefore deemed trustable for initial data exchanges to establish secure communication over the not-trusted in-band channel.
- a Registrar or other managing device may have associated policies that control what characteristics or features of a new device that may be allowed to become active. For example, while a new device may support instant messaging, the Registrar may be configured to ignore and/or not configure such features of software for a new device. This allows a user or other environment administrator to selectively allow resource access, e.g., to implement “guest” access. It will be appreciated restricting access may be based on automatically applied policies (or their equivalent) as well as through interaction with a user or other environment administrator. It will be appreciated various device characteristics, such as device type, owner, bandwidth or other resource requirements, well-behaved time in the environment, etc. may be used as decision factors in granting rights to a device. Thus for example, a telephony device may be brought into the environment and automatically only be granted access to resources compatible with the nature of the device, e.g., to conference data streams, audio portions of audiovisual data, etc.
- the device itself may impose its own access limitations, such as to protect itself from intrusion or to maximize its operation duration.
- a particular device may nonetheless have its own local policy such that the device does not utilize the activity even though present and available in the environment.
- security conscious device owners disallow activity even if offered in a particular environment, such as file sharing in a public access network hotspot.
- a device may be configured to ignore battery intensive features available within an environment.
- each application that registers can be identified in an interface (not illustrated), such as a Graphical User Interface (GUI) for receiving user input, or to an automatic interface to process registrations, where the interface provides opportunity for a user or automatic registration processor to enforce a local policy or user interest in permitting, denying, or modifying an application's registration.
- GUI Graphical User Interface
- the “guest” access discussed above can be interactively enforced for a device introduced into an environment by, during introduction of the device, recognizing it is a foreign device and checking for applicability of rules, policies, or the like and prompting (if needed) a user by way of a GUI or other interface for access rights for this new device.
- a guest device of a visiting friend may be given restricted access in the environment, such as only being allowed to engage in certain types of communication, e.g., to grant or deny Internet access, to grant or deny music streaming, to time limit access to the environment, etc.
- FIG. 4 illustrates a flowchart 400 according to one embodiment for registering for and monitoring for device introductions to an environment. It will be appreciated a device may have multiple software and/or hardware applications or functionality that may be registered 402 , such as with a FIG. 1 Registrar 116 .
- a test is performed to check a newly added device to see if 404 restrictions are applicable to the device. It will be appreciated some devices, such as those previously registered with the system, or devices having a certain characteristic such as a digitally secured trust certificate or other trusted characteristic authenticated by a trusted party such as a CA (Certificate Authority) or other authority recognized by the environment may bypass the restriction checks. If 404 restrictions apply to the new device or functionality, service access restrictions and device configurations may be established 406 - 410 . It will be appreciated while items 406 - 410 are illustrated sequentially, operations may occur in parallel or in a different order than as illustrated, and in some cases only selected operations are performed.
- LAN local area network
- restrictions may be applied automatically and/or interactively through a GUI or other interface.
- a user or environment administrator desires to allow only temporary device access to a network, such as when a visitor comes with a device, such as a Personal Digital Assistant (PDA), music player, camera, etc., and wants the visiting device to connect to the internet, share files with the user, play songs from the music player on a wireless or wired local area network (LAN) capable stereo system, share pictures from a camera, print pictures on a printer in the environment, etc.
- a device such as a Personal Digital Assistant (PDA), music player, camera, etc.
- PDA Personal Digital Assistant
- LAN local area network
- the user and/or administrator needs to grant necessary credentials to the visitor's device for it to perform desired tasks within the environment, e.g., to allow it network access and/or access to devices within the host environment.
- desired tasks e.g., to allow it network access and/or access to devices within the host environment.
- users or environment administrators do not want to give the visiting device unrestricted environment access but instead wants to carefully control the extent of network access the visitor's device receives.
- guest access or other device restrictions may be determined when introducing a device to an environment.
- restrictions are enforced with dynamic filters implemented on an Access Point (AP), router, gateway or other such device through which network access is obtained.
- environment devices and resources are accessible through their own physical and/or logical network reachable through an AP, router, gateway, etc.
- the user or environment administrator has the option of enforcing access restrictions on the new device. It will be appreciated defaults may be assigned for common interests such as Internet access, file access, etc. Access rights may be directly managed by a Registrar, and/or defaults and device specific restrictions may be communicated by the Registrar to an AP, router, gateway, etc. that is positioned to restrict environment access and able to establish access control lists (ACLs), filters, or the like as necessary to restrict access as desired.
- ACLs access control lists
- the user or environment administrator can enable such access via the Registrar.
- a GUI may be used to interactively control initial device access and such a GUI may also be used to change access permissions.
- the Registrar is configured to enumerate available resources within the environment, e.g., shares, or input and/or output devices on the network, such as printers, stereo systems, speakers, etc. The user or administrator may select devices and shares a guest device may access. If access is not directly managed by the Registrar, the Registrar communicates access changes to the AP, router, gateway, etc. which is controlling access and it sets up appropriate ACLs, filters, etc. corresponding to the changed access rights.
- ACLs may be as simple as IP and/or MAC address and/or port-based filters, or may be more advanced, depending on the capability of the Registrar, AP, router, gateway, etc. limiting access to environment resources.
- the guest device obtains access only to specified portions of the network, and will be unable to view or access other resources within the user's network.
- guest access rights may be configured to automatically expire, e.g., time out, or be revoked on certain conditions, such as when the guest device leaves the environment.
- the device may also be desired to establish 408 communication restrictions. For example, when a device is introduced and its applications and/or functionality registered 402 , during the registration process characteristics of the device may be tracked or recorded, such as knowledge that the device is an audio only device such as a telephone, has only a black and white screen, has limited processing power, etc. In the audio only case, for example, communication features discoverable by, or otherwise accessible by, the device may be established in accord with the device's characteristics. For example, if an audio only device seeks to join an audiovisual based conference, the device may be introduced into the conference as an audio only device where all video functionality is automatically disabled, and more particularly, no attempt is made to send video data to the audio only device. Such intelligent data routing may significantly decrease the bandwidth requirements for the audio only device as well as improve bandwidth or other resource performance for other devices having more burdensome requirements.
- communication aggregation 410 may also be performed.
- Common tasks include, for example, streaming audio data, such as music or voice communication, transferring video data such as related to a movie presentation, video conference, video telephone, etc., Voice over IP (VoIP), instant messaging, collaboration applications, and the like.
- streaming audio data such as music or voice communication
- video data such as related to a movie presentation, video conference, video telephone, etc.
- VoIP Voice over IP
- instant messaging such as related to a movie presentation, video conference, video telephone, etc.
- FIG. 5 significant bandwidth may be wasted in having multiple devices all trying to individually communicate with every other device. Instead of such cross-communication, in various configurations communication aggregation may be performed to simplify communication requirements.
- a common communication nexus such as a gateway, router, firewall, etc.
- it may be used to cross-connect devices communicating through it and maintain multiple communication lines on behalf of the devices using the nexus. This thus simplifies the operation of the devices as they need only maintain communication with the nexus, from which the devices will receive the communications from all the other devices. In addition to freeing bandwidth, simplification reduces cost and facilitates home appliance type devices.
- an association 412 is recorded between a device and its hardware or other software devices that need to know about the introduction of the device, and monitoring 414 is performed for new devices being added to the environment.
- a FIG. 3 Application Framework monitors device introductions.
- a FIG. 1 registrar 116 monitors device introductions. As devices are introduced, already registered applications (if any) for the new device are notified when the introduction is complete so that they can engage in data exchanges to provide for automatic configuration of the new device.
- logically processing continues with checking if 416 there was a new device introduction. If 416 a new device is not seen, processing loops back with monitoring 414 for device introductions. The loop 416 back is shown as a dotted line to suggest that processing might not literally loop directly back since a system implementing the illustrated embodiment may perform other tasks and/or processes not illustrated before returning to the monitoring 414 . If 416 a new device was introduced, a check 418 is performed to determine if it has associated (registered) apps. If 420 so, those apps are notified 422 to trigger their responsive action to the introduction, e.g., to configure the device or take some other action. If 416 there was no new device, or if 420 there are no associated applications, or after notifying 422 associated applications, processing loops back to monitoring 414 for new devices.
- priority and/or execution ordering data may be associated with the applications and/or restrictions to capture dependencies that may exist between the applications, e.g., to allow designating that one application needs to be run before another, or to limit application access in accord with restrictions.
- FIG. 3 Application Framework 302 may analyze whether existing device configurations can and/or should be modified in light of new device introduction, such as to take advantage of services now available from the new device.
- An expert system may also be used to control the execution order of associated applications, if needed, when multiple applications registrations exist for a device.
- device may be introduced in a variety of ways, such as, for example, by activating a wireless transceiver, pressing an “install” button or switch, plugging the device in to a bus communicatively coupled with the Application Framework, etc.
- an installation “wizard” may become active on a Registrar and/or or on a user interface for the new device.
- a callback function could be called to trigger execution 414 of the appropriate application(s).
- the installation wizard itself would have previously registered 402 itself for all devices.
- the wizard may provide instructions and/or configuration questions to a user to assist with installing the new device. While in some cases no intervention by the user is required, thus making matters very simple for a user, in other cases, such as when assigning device restrictions, configuring communication aggregation, or introducing a wireless access point, it may respectively be desirable to prompt a user for access rights, aggregation parameters, a SSID (service set identifier) or other personalization data to associate with the new device, etc.
- SSID service set identifier
- FIG. 5 illustrate two different but common device configurations that may be found in a personal or commercial networked environment such as a Digital Home or Office LAN environment.
- FIG. 5A illustrates a typical peer to peer (P2P) type of conference 500 , in which every device 502 - 506 (e.g., conference endpoints) is required to establish a communication connection with every other device in the conference, such as outside endpoints 508 - 512 . As illustrated, this results in a lot of cross-communication, bandwidth consumption, and communication complexity due to the many crossing communication lines 514 between the devices 502 - 512 .
- P2P peer to peer
- Such overhead is especially burdensome in some configurations in which devices participating in a common task, such as a conference, share a common network access, such as a gateway, firewall or other device 516 as illustrated in FIG. 5B .
- all devices 502 - 512 need to establish a communication connection to every other device, however, since several 502 - 506 of the devices are behind a common communication nexus 516 such as a gateway, firewall, or the like, this device 516 bears the burden of passing all communication between inner 502 - 506 and outer 508 - 512 devices, which also may result in the nexus 516 being a bottleneck. Combining related communication and/or other data transfers may significantly facilitate communication by multiple devices engaging in the common task.
- devices when registering/introducing devices in an environment, e.g., as discussed above with respect to FIG. 4 , devices may be evaluated for whether they support functionality that may be aggregated with other devices if such devices are engaged in a common task. For example, as illustrated in the FIG. 6 system 600 of devices, if devices 602 - 606 all support a particular task, such as conferencing (which includes audio and/or visual conferencing, data conferencing, etc.), the devices are instructed during registration or introduction to use an aggregation communication mode instead of a conventional communication mode.
- conferencing which includes audio and/or visual conferencing, data conferencing, etc.
- the devices are all communicatively coupled by way of a network 608 and communicate through a common communication nexus 610 referred to herein as a such as a Media Gateway Device (MGD).
- MGD Media Gateway Device
- the MGD also incorporates the Registrar, e.g., FIG. 1 item 116 , to which devices are introduced.
- a MGD incorporates data handling capabilities of a gateway, firewall, or the like, along with aggregation features (and Registrar features if present) discussed below.
- the devices establish individual communication connections 612 - 616 with the MGD 610 , e.g., over their local wired and/or wireless network 608 .
- the MGD then establishes connections 618 as needed to outside (e.g., with respect to local network(s) 608 ) end points 622 - 626 .
- each outside endpoint is aware of the MGD and hence pursuant to a protocol agreed upon by the endpoints and MGD, each outside endpoint establishes a single communication line 620 to the MGD, e.g., over the Internet or other network 628 communicatively coupling the endpoints 602 - 606 , 622 - 626 with the understanding the MGD will convey data as needed to the inside endpoints.
- each of the illustrated communication lines 620 represents three communication lines from each outside endpoint to each inside endpoint, however, each of these routes to the MGD since it remains the common communication nexus for the inside endpoints.
- the MGD may attempt to establish a more optimal communication for the device as well as for the communication with outside endpoints 622 - 626 through the MGD or other gateway, firewall, router, etc. For example, if device 602 is an audio-only telephone, even if the telephone attaches to an audiovisual conference, the MGD can automatically strip out video data from other participants to simplify what data 612 the telephone is required to process. This type of proxying for the telephone also allows the MGD to act as a transcoder to allow incompatible devices to engage in activities not ordinarily supported, such as a video conference on an audio-only device.
- NIC network interface card
- audio capabilities or associated codecs audio capabilities or associated codecs
- video capabilities or associated codecs screen size, resolution, output abilities, camera specifications, text capabilities, specific application support (SkypeTM, Instant Messaging, VoIP applications, collaboration applications, etc.), and decisions made regarding aggregation, transcoding, and the like.
- SkypeTM Instant Messaging, VoIP applications, collaboration applications, etc.
- the MGD 610 is used to set up conference calls with the outside endpoints 622 - 626 for internal home devices 602 - 606 that wish to join these calls.
- the MGD also functions as a home media server, and hence is capable of streaming media to endpoint devices in the home.
- the devices may have wired and/or wireless connections to the MGD.
- the MGD reviews the discovered capabilities of the newly introduced device. It will be appreciated the MGD may directly receive these capabilities if it is collocated with a Registrar, or this information is passed to the MGD (e.g., by way of a push or pull mechanism) after successful registration or introduction of a device.
- the MGD may also be configured to poll for capabilities responsive to monitored execution of certain applications, e.g., in FIG. 3 application layer 302 , using a device within the environment, such as communication software executed on an endpoint 602 - 606 .
- the MGD sets up a conference call with outside entities, e.g., between outside endpoints 622 - 626 and inside devices 602 - 606 in the Digital Home.
- outside entities e.g., between outside endpoints 622 - 626 and inside devices 602 - 606 in the Digital Home.
- there is a single MGD there is a single MGD; it will be appreciated there may be multiple MGDs each communicatively coupled so as to tie together multiple sub-networks of devices.
- multiple MGDs if present, may operate as a single MGD.
- each device sets up a session with the MGD, which in turn multiplexes all media streams and sends them to the outside devices participating in the common communication task, e.g., the conference call.
- the MGD uses the device capability information provided and/or discovered when the device joined the network, e.g., during registration or introduction, to mediate the media traffic, determine what data ad/or media streams get sent to particular devices, and transcode or otherwise scale data, such as to reduce high resolution images for small screen sizes, such as for a cell phone or to remove the video entirely, to reduce audio bitrates, etc.
- a more powerful device such as a desktop or laptop computer engaging in the common communication task will, however, receive complete media streams since such devices are able to support higher capabilities.
- the MGD functions as a multiplexer/de-multiplexer for the endpoint communications.
- the MGD collates incoming streams from devices 602 - 606 and sends them out as a single stream to an outside endpoint 622 - 626 .
- the MGD receives data for the common communication task from each of the outside endpoints and combines them into a single data stream provided to each of the inside endpoints.
- the Registrar or MGD incorporating the Registrar receiving device registration acts as a local Certificate Authority (CA) and hence may act as an authority as to the identity of devices within an environment thus allowing devices within the environment to validate the identity of other devices as desired.
- CA Certificate Authority
- conference participants or other endpoints may establish trust relationships with the MGD and indirectly establish trust with other conference participants or endpoints based at least in part on knowledge the other participants or endpoints have similarly established trust relationships with the MGD.
- FIG. 7 and the following discussion are intended to provide a brief, general description of a suitable environment in which certain aspects of the illustrated invention may be implemented.
- the term “machine” is intended to broadly encompass a single machine, or a system of communicatively coupled machines or devices operating together.
- Exemplary machines include computing devices such as personal computers, workstations, servers, portable computers, handheld devices, e.g., Personal Digital Assistant (PDA), telephone, tablets, etc., as well as transportation devices, such as private or public transportation, e.g., automobiles, trains, cabs, etc.
- PDA Personal Digital Assistant
- the environment includes a machine 700 that includes a system bus 702 to which is attached processors 704 , a memory 706 , e.g., random access memory (RAM), read-only memory (ROM), or other state preserving medium, storage devices 708 , a video interface 710 , and input/output interface ports 712 .
- the machine may be controlled, at least in part, by input from conventional input devices, such as keyboards, mice, etc., as well as by directives received from another machine, interaction with a virtual reality (VR) environment, biometric feedback, or other input source or signal.
- VR virtual reality
- the machine may include embedded controllers, such as programmable or non-programmable logic devices or arrays, Application Specific Integrated Circuits, embedded computers, smart cards, and the like.
- the machine may utilize one or more connections to one or more remote machines 714 , 716 , such as through a network interface 718 , modem 720 , or other communicative coupling.
- Machines may be interconnected by way of a physical and/or logical network 722 , such as the network 108 of FIG. 1 , an intranet, the Internet, local area networks, and wide area networks.
- communication with network 722 may utilize various wired and/or wireless short range or long range carriers and protocols, including radio frequency (RF), satellite, microwave, Institute of Electrical and Electronics Engineers (IEEE) 802.11, Bluetooth, optical, infrared, cable, laser, etc.
- RF radio frequency
- IEEE Institute of Electrical and Electronics Engineers
- Associated data may be stored in, for example, volatile and/or non-volatile memory 706 , or in storage devices 708 and/or associated storage media, including conventional hard-drives, floppy-disks, optical storage, tapes, flash memory, memory sticks, digital video disks, etc., as well as more exotic mediums such as machine-accessible biological state preserving storage.
- Associated data may be delivered over transmission environments, including network 722 , in the form of packets, serial data, parallel data, propagated signals, etc., and may be used in a compressed or encrypted format. Associated data may be used in a distributed environment, and stored locally and/or remotely for access by single or multi-processor machines. Associated data may be used by or in conjunction with embedded controllers; hence in the claims that follow, the term “logic” is intended to refer generally to possible combinations of associated data and/or embedded controllers.
- remote machines 714 , 716 may respectively be FIG. 1 Client 114 and Station 104 . It will be appreciated that remote machines 714 , 716 may be configured like machine 700 , and therefore include many or all of the elements discussed for machine.
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US10116528B2 (en) | 2015-10-02 | 2018-10-30 | Keysight Technologies Singapore (Holdings) Ptd Ltd | Direct network traffic monitoring within VM platforms in virtual processing environments |
US10142212B2 (en) | 2015-10-26 | 2018-11-27 | Keysight Technologies Singapore (Holdings) Pte Ltd | On demand packet traffic monitoring for network packet communications within virtual processing environments |
US9996397B1 (en) * | 2015-12-09 | 2018-06-12 | International Business Machines Corporation | Flexible device function aggregation |
US10372502B2 (en) * | 2015-12-09 | 2019-08-06 | International Business Machines Corporation | Flexible device function aggregation |
CN111491277A (zh) * | 2020-04-08 | 2020-08-04 | 吴义魁 | 无线物联网异常处理方法、智能网关及相关装置 |
US11968420B2 (en) | 2023-08-14 | 2024-04-23 | Rateze Remote Mgmt Llc | Audio or visual output (A/V) devices registering with a wireless hub system |
Also Published As
Publication number | Publication date |
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US8464322B2 (en) | 2013-06-11 |
EP2076994A2 (de) | 2009-07-08 |
WO2008105922A3 (en) | 2009-03-12 |
US20120096141A1 (en) | 2012-04-19 |
WO2008105922A2 (en) | 2008-09-04 |
EP2076994A4 (de) | 2012-07-25 |
EP2677788B1 (de) | 2015-03-04 |
CN101523798B (zh) | 2012-02-29 |
EP2677788A1 (de) | 2013-12-25 |
CN101523798A (zh) | 2009-09-02 |
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