Patent Publication Number: US-9853719-B2

Title: Discovery of nearby devices for file transfer and other communications

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of U.S. Provisional Application No. 61/832,886, filed Jun. 9, 2013 and entitled “DISCOVERY OF NEARBY DEVICES FOR FILE TRANSFER AND OTHER COMMUNICATIONS”, which is incorporated by reference herein in its entirety for all purposes. 
    
    
     TECHNICAL FIELD 
     The described embodiments relate generally to wireless communications, and more particularly to discovering nearby wireless communication devices and to communicating information to/from discovered wireless communication devices. 
     BACKGROUND 
     Wireless communication devices can include capabilities to communicate using one or more different radio access technologies (RATs) in accordance with various wireless communication protocols. With an increasing array of functionalities, which can generate, receive, process, and/or store data in various forms, wireless communication devices can also serve as substitutes for more general purpose computing devices. As such, a user of a wireless communication device can seek to connect and communicate with other wireless communication devices directly, e.g., to share files, media, applications, or other data available on the wireless communication device. Wireless communication devices can discover nearby wireless communication devices, e.g., by having one wireless communication device actively enable a “locate” function that broadcasts an intention to establish a shared connection, and by actively having an additional wireless communication device enable a “scan” function to listen for broadcast messages. Despite the considerable efforts in this domain, current methods for discovering wireless communication devices with which to establish connections and share information can be improved. 
     SUMMARY OF THE DESCRIBED EMBODIMENTS 
     Methods and apparatuses for wireless communication devices to discover each other, to establish connections to each other, and to share information with each other are described. In representative embodiments, wireless communication devices use one or more wireless communication protocols to transmit and receive messages to identify compatible wireless communication devices with which to establish connections and to share information. The messages include indicators for a communication service and one or more user identification values. A scanning wireless communication device filters messages received from one or more broadcasting wireless communication devices according to a set of matching filter criteria including comparing values contained in fields of the received messages. The scanning wireless communication device identifies a message from a broadcasting wireless communication device that satisfies the set of matching filter criteria and extracts user identification values from the message. The scanning wireless communication device compares the extracted user identification values, which are associated with the broadcasting wireless communication device and/or a user thereof, to at least a portion of a local set of user identification values stored in and/or associated with the scanning wireless communication device. When an extracted user identification value from the message matches a user identification value in the local set of user identification values, the scanning wireless communication device establishes a connection to the broadcasting wireless communication device according to the communication service indicated in the message. In some embodiments, the user identification values are broadcast in an encrypted form. In some embodiments, messages are communicated according to a wireless personal area network communication protocol, and the communication service uses a connection according to a wireless local area network communication protocol. 
     This Summary is provided merely for purposes of summarizing some example embodiments, so as to provide a basic understanding of some aspects of the subject matter described herein. Accordingly, it will be appreciated that the above-described features are merely examples and should not be construed to narrow the scope or spirit of the subject matter described herein in any way. Other features, aspects, and advantages of the subject matter described herein will become apparent from the following Detailed Description, Figures, and Claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The described embodiments and the advantages thereof may best be understood by reference to the following description taken in conjunction with the accompanying drawings. These drawings are not necessarily drawn to scale, and in no way limit any changes in form and detail that may be made to the described embodiments by one skilled in the art without departing from the spirit and scope of the described embodiments. 
         FIG. 1  illustrates a wireless communication device capable of operating in one or more different wireless communication networks in accordance with some embodiments. 
         FIG. 2  illustrates representative wireless local area network communication paths between two different wireless communication devices in accordance with some embodiments. 
         FIG. 3  illustrates a direct connection using one or more different radio access technologies between two different wireless communication devices in accordance with some embodiments. 
         FIG. 4  illustrates elements of a representative wireless communication device that can support communication through multiple wireless networks in accordance with some embodiments. 
         FIG. 5  illustrates a sequence of actions performed by two wireless communication devices using two different wireless networks in accordance with some embodiments. 
         FIG. 6  illustrates a representative format for a message communicated through a wireless network to advertise information to compatible wireless communication devices in accordance with some embodiments. 
         FIG. 7  illustrates a communication flow chart between two wireless communication devices to discover each other using a first wireless network and subsequently to establish a connection and share data using a second wireless network in accordance with some embodiments. 
         FIG. 8  illustrates a flowchart according to an example method to discover a wireless communication device and to establish a connection and transfer information in accordance with some embodiments. 
         FIG. 9  illustrates a flowchart according to another example method to discover a wireless communication device and to establish a connection and transfer information in accordance with some embodiments. 
         FIG. 10  illustrates a flowchart according to a further example method to discover a wireless communication device and to establish a connection in accordance with some embodiments. 
     
    
    
     DETAILED DESCRIPTION OF SELECTED EMBODIMENTS 
     The described embodiments relate generally to wireless communications, and more particularly to discovering nearby wireless communication devices and to communicating information to/from discovered wireless communication devices. 
     Wireless communication devices can incorporate wireless circuitry for multiple different radio access technologies (RATs) to provide connections according to different wireless communication protocols. A wireless communication device can include wireless circuitry (including combinations of hardware and software) to support a wireless personal area network (WPAN) communication protocol, e.g., as standardized by the Bluetooth® special interest group (SIG), and a wireless local area network (WLAN) communication protocol, e.g., as standardized by the Institute of Electrical and Electronics Engineers (IEEE) 802.11 working group (i.e., IEEE 802.11a/b/g/n/ac, IEEE 802.11-2012, and/or other IEEE 802.11 communication protocols) and promoted by the Wi-Fi Alliance. A broadcasting wireless communication device can search for nearby wireless communication devices with which to establish a connection and share data by broadcasting messages that indicate an intention to establish a connection and/or to share data between wireless communication devices. A scanning wireless communication device can scan for broadcast messages and can filter received messages according to a set of matching filter criteria to limit processing requirements for handling received messages. The set of matching filter criteria can provide for accepting messages from wireless communication devices based on information contained in the messages. The information used for filtering received messages can include device identification (e.g., properties of the wireless communication device from which the message originates), service identification (e.g., a particular connection and/or data sharing service indicated in the message), user identification (e.g., information in the message matching to a contact list and/or address book in the receiving wireless communication device), or a combination of these. At least a portion of information communicated in broadcast messages can be communicated and compared using an encrypted form to secure sensitive personal information when broadcasting messages that request to establish a connection and/or share data with another wireless communication device. In some embodiments, scanning wireless communication devices can scan for messages using a background process. Broadcasting wireless communication devices can broadcast messages according to a WPAN communication protocol, e.g., Bluetooth Low Energy (BTLE). Upon reception of a broadcast message that “passes” a set of matching filter criteria, a scanning wireless communication device can enable dormant wireless circuitry in the scanning wireless communication device, e.g., WLAN wireless circuitry, in order to establish a higher layer data sharing connection to the broadcasting wireless communication device. In some embodiments, broadcast messages can include information that may be used to assist in establishing the higher layer data sharing connection. In some embodiments, the methods and apparatuses described herein can provide for discovering “compatible” nearby wireless communication devices with which to establish peer-to-peer wireless connections and share data. In some embodiments, a wireless communication device can be considered “compatible” when broadcast messages from the wireless communication device include information that identifies the broadcasting wireless communication device as “known” to the receiving wireless communication device. 
     A wireless communication device can discover “compatible” wireless communication devices and establish connections to discovered wireless communication devices in order to provide specific services, e.g., for attaching peripheral wireless communication devices to a main wireless communication device through a WPAN or for establishing a peer-to-peer wireless connection. A WPAN communication protocol can be used for discovery of nearby wireless communication devices, e.g., by using a background scanning process in accordance with the WPAN communication protocol. A representative WPAN communication protocol can include BTLE. 
     The wireless communication device can also include wireless circuitry to support a wireless local area network (WLAN) according to a WLAN communication protocol, e.g., a Wi-Fi communication protocol. In some embodiments, a wireless communication device can incorporate wireless circuitry to support communication through both a WPAN and a WLAN, with the WPAN used for scanning and device discovery followed by the WLAN used for information transfer. 
     A WLAN can provide a centrally managed connection between two different wireless communication devices through a dedicated access point (AP), the AP acting as a common centralized hub through which communication occurs. Alternatively, the two different wireless communication devices can establish a direct peer-to-peer (P2P) WLAN connection between each other without using a dedicated AP, according to a standardized or proprietary wireless communication protocol, e.g., by having either wireless communication device act as a limited AP and/or through other techniques. The direct P2P WLAN connection can provide for communication directly between the two different wireless communication devices, which can be used for communication services that provide various types of information data transfer (e.g., file sharing, printing, and/or media streaming). Representative direct P2P WLAN connections can include a Wi-Fi Direct connection, an Apple Wireless Direct Link (AWDL) connection, and an IEEE 802.11 ad hoc mode connection; and representative communication services, which may be used to communicate data using the direct P2P WLAN connections, include AirDrop®, AirPrint™, and AirPlay® (provided by software on products of Apple Inc.), and/or other communication services. 
     A first “scanning” wireless communication device can include WPAN wireless circuitry, which can be configured to scan for messages broadcast by other wireless communication devices. In a representative embodiment, the WPAN wireless circuitry can use a Bluetooth Low Energy (BTLE) wireless communication protocol, e.g., as defined as part of a Bluetooth 4.X or later specification published by the Bluetooth SIG. The WPAN wireless circuitry can be enabled continuously (and/or configured to operate based on a user preference or based on other power state dependent conditions) to provide a “background” scanning capability to the first scanning wireless communication device to listen for WPAN messages from compatible wireless communication devices that broadcast messages indicating availability of one or more communication services. In an embodiment, a second “broadcasting” wireless communication device can broadcast a WPAN message, e.g., a BTLE advertising message (also referred to as an advertising packet) on one or more advertising channels according to the BTLE wireless communication protocol. The BTLE advertising messages broadcast by the second broadcasting wireless communication device can include a set of information by which the first scanning wireless communication device can filter the advertising messages to determine whether to initiate establishing a connection and/or sharing data with the second broadcasting wireless communication device. In an embodiment, the BTLE advertising message broadcast by the second broadcasting wireless communication device can include a manufacturing identification field that identifies a particular company associated with the second broadcasting wireless communication device. In an embodiment, the manufacturing identification field can include a unique numeric identifier specified by the Bluetooth SIG. In an embodiment in which the manufacturer of the second broadcasting wireless communication device is Apple Inc., the manufacturing identification field can have a value of 0x004C, which corresponds to a manufacturing company incorporated as Apple Inc. In an embodiment in which the manufacturer of the second broadcasting wireless communication device is a specific company, the manufacturing identification field can have a particular value that corresponds to the specific company. The first scanning wireless communication device can scan for BTLE advertising messages that include one or more particular values in the manufacturing identification field and can ignore other BTLE advertising messages that do not include the one or more particular values in the manufacturing identification field. In an embodiment, the first scanning wireless communication device can scan for BTLE advertising messages that includes a value in the manufacturing identification field that matches a particular value for a specific manufacturing company associated with the first scanning wireless communication device. In an embodiment, WPAN wireless circuitry in the first scanning wireless communication device can scan for and identify BTLE advertising messages having one or more particular values in the manufacturing identification field, while an application processor in the first scanning wireless communication device can be powered down (or minimally powered) to reduce power consumption by the first scanning wireless communication device while in the scanning mode. 
     The broadcast BTLE advertising message can also include a communication service identification field that can specify a particular communication service that the second broadcasting wireless communication device can provide to the first scanning wireless communication device. The first scanning wireless communication device can scan for BTLE advertising messages that include one or more particular values in the communication service identification field and can ignore other BTLE advertising messages that do not include those one or more particular values in the communication service identification field. In a representative embodiment, the communication service identification field can include a particular value that specifies a particular communication service offered by the second broadcasting wireless communication device to the first scanning wireless communication device, e.g., an AirDrop file sharing service for data transfer between two compatible wireless communication devices. In an embodiment, WPAN wireless circuitry of the scanning wireless communication device can scan for and identify BTLE advertising messages having one or more particular values in the communication services identification field, while the application processor can remain dormant and/or minimally powered. In a representative embodiment, the WPAN wireless circuitry can scan for a combination of one or more particular values in the manufacturing identification field and one or more particular values in the communication services identification field. The scanning wireless communication device can ignore BTLE advertising messages that do not match particular values for the manufacturing identification field and/or particular values for the communication service identification field. In an embodiment, BTLE advertising messages that match the combination of one or more particular values for both the manufacturing identification field and the communication service identification field can be transferred from the WPAN wireless circuitry to an application processor in the scanning wireless communication device that can further analyze contents of the BTLE advertising messages. In some embodiments, the WPAN wireless circuitry can extract additional information and/or process extracted additional information contained in select BTLE advertising messages before communicating all or a portion of the BTLE advertising messages (and/or information extracted therefrom) to the application processor. 
     The broadcast BTLE advertising message can also include a user identification field that can provide user information that identifies a user of the second broadcasting wireless communication device, the second broadcasting wireless communication device, or both the user of the second broadcasting wireless communication device and the second broadcasting wireless communication device. In an embodiment, the user information included in the broadcast BTLE advertising message can be provided in an encrypted form, e.g., as a set of cryptographic hashes of user information available in the second broadcasting wireless communication device. In an embodiment, the application processor of the first scanning wireless communication device can extract a set of encrypted user identification values associated with the second broadcasting wireless communication device from the broadcast BTLE advertising message. In a representative embodiment, the user identification field can include a set of encrypted email addresses and/or a set of encrypted mobile device numbers that can identify the user of the second broadcasting wireless communication device or the second broadcasting wireless device. In an embodiment, the user identification field includes cryptographic hashes of one or more email address and/or one or more mobile device numbers and/or one or more login identifiers. In an embodiment, the user of the second broadcasting wireless communication device can specify the set of user identification information to include in the broadcast BTLE advertising message. In another embodiment, a combination of hardware and/or software in the second broadcasting wireless communication device automatically selects a set of user identification information available in and/or associated with the second wireless communication device to encrypt and include in the user identification field of broadcast BTLE advertising messages. 
     The first scanning wireless communication device can extract from the broadcast BTLE advertising message the encrypted information provided in the user identification field provided by the second broadcasting wireless communication device and compare the extracted information to a set of similar encrypted information stored in (and/or associated with) the first scanning wireless communication device (and/or with a user thereof). In some embodiments, the encrypted information for the first scanning wireless communication device (and/or for a user thereof) includes a set of cryptographic hashes of one or more email addresses, phone numbers, login identifiers, or a combination of these associated with the first scanning wireless communication device. In some embodiments, encrypted information is a set of cryptographic hashes of information stored in a contacts list and/or in an address book stored in and/or associated with the first scanning wireless communication device (and/or with the user thereof). In an embodiment, extraction of the encrypted information from the broadcast BTLE advertising message and comparison of the extracted encrypted information to locally stored and/or associated encrypted information can occur in the application processor of the first scanning wireless communication device. In some embodiments, encrypted information can be extracted and compared only for broadcast BTLE advertising messages that match particular values for the manufacturing identification field and/or for the communication service identification field. In another embodiment, extraction and comparison of the encrypted user identification information can occur, at least in part, in the WPAN wireless circuitry of the first scanning wireless communication device. 
     When a portion of the encrypted information extracted from the broadcast BTLE advertising message (which is associated with the second broadcasting wireless communication device) and a portion of the encrypted information stored in (and/or associated with) the first scanning wireless communication device matches a set of matching filter criteria, the first scanning wireless communication device can enable WLAN wireless circuitry in the first scanning wireless communication device, e.g., in order to communicate further with the second broadcasting wireless communication device to establish a WLAN connection and to transfer information (or provide another compatible wireless communication service through the established WLAN connection). The wireless communication service can be provided in accordance with a WLAN wireless communication protocol through a WLAN connection established between the first scanning wireless communication device (that scanned for advertising messages using a WPAN wireless communication protocol) and the second broadcasting wireless communication device (that broadcast advertising messages using the WPAN wireless communication protocol.) In an embodiment, the first scanning wireless communication device can establish a peer-to-peer WLAN connection directly to the second broadcasting wireless communication device. In an embodiment, the second broadcasting wireless communication device can transfer information to the first scanning wireless communication device using the particular communication service specified in the broadcast BTLE advertising message over the established peer-to-peer WLAN connection. In a representative embodiment, the peer-to-peer WLAN connection operates in accordance with a Wi-Fi wireless communication protocol. 
     As described herein, a WPAN wireless communication protocol can provide for discovering compatible nearby wireless communication devices, and a WLAN wireless communication protocol can provide for transferring data between compatible wireless communication devices. BTLE advertising messages received by a first scanning wireless communication device can include information by which to identify a second broadcasting wireless communication device (and/or a user thereof) in order to determine whether to establish a connection and/or a data sharing service between them. In some embodiments, the information included in the BTLE advertising messages can include encrypted versions of information contained in a contact list and/or an address book of the second broadcasting wireless communication device, and the first scanning wireless communication device can compare information in the BTLE advertising messages to local encrypted versions of similar information, e.g., information in a local contact list and/or address book of the first scanning wireless communication device. In an embodiment, a BTLE advertising message can include information about the WLAN configuration of a second broadcasting wireless communication device to provide to a first scanning wireless communication device to assist in establishing a WLAN connection between them. 
       FIG. 1  illustrates a set of overlapping wireless networks  100  for a wireless communication device  102 . The wireless communication device  102  can include a combination of hardware and software to provide wireless connections over one or more different wireless networks alone, separately, or in combination. The wireless communication device  102  can include hardware and software to provide communication over a wireless personal area network (WPAN)  104 . WPAN connections can be provided for connecting the wireless communication device  102  to many different types of devices, including but not limited to peripheral devices, e.g., headsets, earpieces, supplemental display devices, and supplemental input/output devices, as well as to other wireless communication devices  102 . A representative WPAN  104  can operate in accordance with a WPAN communication protocol specified by the Bluetooth SIG. The wireless communication device  102  can also include hardware and software to provide communication over a wireless local area network (WLAN)  106 . The wireless communication device  102  can include separate hardware and software for the WPAN  104  and the WLAN  106 . Both the WPAN  104  and WLAN  106  can operate as “local” networks. The wireless communication device  102  can include additional hardware and software to provide a wireless wide area network (WWAN)  108  capability, e.g., to interconnect with one or more cellular networks. 
       FIG. 2  illustrates a set  200  of different WLAN  106  connections that can exist between two different wireless communication devices  102 A and  102 B. Each wireless communication device  102 A/B can be connected through a wireless access point  202  using connections  204  between the wireless communication devices  102 A/B and the wireless access point  202 . The wireless access point  202  can provide a secure and fully functional WLAN  106 . Two different wireless communication devices  102 A/B can also establish a direct peer-to-peer (P2P) WLAN connection  206  with each other. A peer-to-peer wireless connection can allow a wireless communication device  102 A/B to communicate for specific purposes with minimal setup negotiation required. Peer-to-peer WLAN connections  206  between wireless communication devices  102 A/B can be useful as more computing devices include WLAN radio frequency (RF) capability, e.g., computers, printers, scanners, and cameras, in addition to mobile computing devices. Communication over a WPAN connection and over a WLAN connection can occur directly between wireless communication devices  102 A/B that support P2P wireless connections without requiring a stand-alone wireless access point  202 . 
       FIG. 3  illustrates a simple form of a peer-to-peer wireless local area network  300  in which two wireless communication devices  102 A and  102 B can communicate directly with each other through a wireless connection  302  without relying on an existing access point wireless network infrastructure. The two wireless communication devices  102 A and  102 B can communicate directly with each other to establish the wireless connection  302  of the peer-to-peer WLAN  300 , e.g., by using at least in part a WPAN wireless communication protocol as described hereinabove. The wireless communication devices  102 A and  102 B can use the WPAN wireless communication protocol to broadcast wireless communication service capabilities to each other, e.g., using “advertising” messages such as BTLE advertising messages according to a BTLE wireless communication protocol. A wireless communication device, e.g., wireless communication device  102 A, can also scan for advertising messages using WPAN wireless circuitry in the background to locate compatible wireless communication devices  102 , e.g. wireless communication device  102 B, that can offer wireless communication services with which to connect and transfer information. 
       FIG. 4  illustrates a representative set of interconnected blocks (processing elements)  400  in a wireless communication device  102 . The wireless communication device  102  can include wireless circuitry that supports different wireless communication protocols and/or radio access technologies. In some embodiments, the wireless communication device  102  can include separate wireless circuitry for different wireless communication protocols and/or radio access technologies. In some embodiments, the wireless communication device  102  can include a combined, integrated block of wireless circuitry that can support a combination of different wireless communication protocols and/or different radio access technologies. A representative wireless communication device  102  can include WLAN wireless circuitry  402  coupled to one or more antennas and WPAN wireless circuitry  404  coupled to one or more antennas. In some embodiments, the WLAN wireless circuitry  402  and the WPAN wireless circuitry  404  are coupled to separate antennas and can use different hardware processing elements. In some embodiments, the WLAN wireless circuitry  402  and the WPAN wireless circuitry  404  are coupled to one or more common antennas (not shown) and can use a common set of hardware processing elements. The WLAN wireless circuitry  402  and the WPAN wireless circuitry  404  can include transmitters and receivers to provide signal processing of radio frequency wireless signals formatted according to wireless communication protocols, e.g., a Wi-Fi WLAN wireless communication protocol and a Bluetooth Low Energy WPAN wireless communication protocol respectively. In some embodiments, the WLAN wireless circuitry  402  and the WPAN wireless circuitry  404  can include components such as: processors and/or specific-purpose DSP circuitry for implementing functionality such as, but not limited to, baseband signal processing, physical layer processing, data link layer processing, and/or other functionality; one or more digital to analog converters (DACs) for converting digital data to analog signals; one or more analog to digital converters (ADCs) for converting analog signals to digital data; radio frequency (RF) circuitry (e.g., one or more amplifiers, mixers, filters, phase lock loops (PLLs), and/or oscillators); and/or other components. 
     The WLAN wireless circuitry  402  and the WPAN wireless circuitry  404  can be connected to additional processing circuitry in the wireless communication device  102  including an application processor  406  that can provide higher layer processing, e.g., application and transport layer protocol processing. The application processor  406  can be connected to an input/output (IO) block  408  through which information can be displayed to a user of the wireless communication device  102  and also through which the user of the wireless communication device  102  can enter information. In some embodiments, a common IO block  408  can be used both to display information to the user and to accept user inputs. In an embodiment, the application processor  406  can control functionality performed by all or portions of the WLAN and WPAN wireless circuitries  402 / 404 . The application processor  406  can power down portions of the WLAN and WPAN wireless circuitries  402 / 404  to reduce power consumption based on various operating conditions, e.g., when idle and/or operating solely on battery power and/or based of expiration of one or more dormancy timers. In an embodiment, the application processor  406  can power down the WLAN wireless circuitry  402  and enable all or part of the WPAN wireless circuitry  404 , e.g., a receiver signaling processing chain of the WPAN wireless circuitry  404 , in order to scan for messages using a WPAN wireless communication protocol. In an embodiment, the WPAN wireless circuitry  404  can operate according to a BTLE wireless communication protocol. 
     The WPAN wireless circuitry  404  can scan for advertising messages that can include multiple identification fields, through which the WPAN wireless circuitry  404  can locate additional wireless communication devices  102  that can offer wireless communication services. The WPAN wireless circuitry  404  can alert the application processor  406  when receiving one or more advertising messages from a “compatible” wireless communication device  102 . In some embodiments, “compatibility” between a first scanning wireless communication device  102  and a second broadcasting wireless communication device  102  can be determined by examining information contained in the advertising messages. The application processor  406  can operate in a power reduced or dormant state while the WPAN wireless circuitry  404  scans for advertising messages using the WPAN wireless communication protocol. When obtaining one or more advertising messages that match a set of filter matching criteria, the WPAN wireless circuitry  404  can provide an indication to the application processor  406 , which can “transition” from the power reduced or dormant state and can provide further processing of information included in the advertising messages. The WPAN wireless circuitry  404  can transfer information extracted from the one or more advertising messages to the application processor  406  to determine if the wireless communication devices  102  from which the advertising messages were received are compatible with the particular wireless communication device  102  that received the advertising messages. When locating a compatible wireless communication device  102 , the application processor  406  can enable the WLAN wireless circuitry  402  in order to establish a WLAN connection to the compatible wireless communication device  102 . In some embodiments, the WLAN wireless circuitry  402  (or a portion thereof) can be in a dormant or power reduced state, and the application processor  406  can “transition” the WLAN wireless circuitry  402  (or portion thereof) before establishing a higher data throughput connection. In some embodiments, the application processor  406  provides information extracted from the advertising messages to the WLAN wireless circuitry  402  to assist with establishing a WLAN connection to the compatible wireless communication device  102 . In some embodiments, the WPAN wireless circuitry  404  passes information extracted from the advertising messages directly to the WLAN wireless circuitry  402 . In some embodiments, the WPAN wireless circuitry  404  and the WLAN wireless circuitry  402  communicate directly with each other in order to coordinate a transition from a scanning mode that uses a WPAN wireless communication protocol to a data transfer mode that uses a WLAN wireless communication protocol. In some embodiments, the WPAN wireless circuitry  404  and the WLAN wireless circuitry  402  comprise portions of a combined block of wireless circuitry that provides for communication according to one or more WPAN and/or WLAN wireless communication protocols. 
     In some embodiments, the application processor  406  compares information contained in one or more of the advertising messages to local information stored in and/or associated with the wireless communication device  102 . In some embodiments, the wireless communication device  102  includes non-volatile storage (not shown) in which can be stored all or portions of information with which to filter advertising messages according to a set of matching filter criteria. In some embodiments, the non-volatile storage stores all or portions of a local set of user identification information associated with the wireless communication device  102  and/or a user thereof. In some embodiments, the application processor  406  compares user identification information extracted from received advertising messages to all or portions of the local set of user identification information, e.g., to determine compatibility between the wireless communication device  102  that received the advertising message and the wireless communication device  102  that broadcast the advertising message. In some embodiments, the user identification information included in the advertising message can be formatted in an encrypted form. In some embodiments, the set of local user identification information can likewise be formatted in an encrypted form. The application processor  406  can compare the extracted user identification information to the local set of user identification information by comparing encrypted forms thereof, in some embodiments. The local set of user identification information can be all or portions of a contact list and/or an address book stored in and/or associated with the wireless communication device  102 . In some embodiments, comparison of the user identification information is performed at least in part by portions of wireless circuitry (e.g., WPAN wireless circuitry  404  and/or WLAN wireless circuitry  402 ) in the wireless communication device  102 . 
       FIG. 5  illustrates a sequence of actions  500  that can occur between two wireless communication devices  102 A and  102 B in order to locate compatible wireless communication devices  102  between which to share information. The two wireless communication devices  102 A and  102 B can be referred to as a scanning wireless communication device  102 B that can passively scan for messages from other wireless communication devices  102 , including, e.g., from a broadcasting wireless communication device  102 A that can transmit advertising messages as described herein. The WLAN wireless circuitry  402 B and the WPAN wireless circuitry  404 B in the scanning wireless communication device  102 B can be configured according to software, hardware, operating conditions, and/or user preferences. In some embodiments, aspects of enabling operating states of the WLAN wireless circuitry  402 B and the WPAN wireless circuitry  404 B in the scanning wireless communication device  102 B can be determined by operating system software of the application processor  406 B and/or by inputs provided by a user of the scanning wireless communication device  102 B, e.g., through the input/output (IO) block  408 B. In an embodiment, one or more settings for wireless communication protocols (and accordingly the hardware and/or software that supports the wireless communication protocols) can be obtained from a user of the scanning wireless communication device  102 B through the IO block  408 B. In an embodiment, the user can enable separate use of the WLAN wireless circuitry  402 B and of the WPAN wireless circuitry  404 B, e.g., by providing one or more indications through the IO block  408 B of the scanning wireless communication device  102 B. The user inputs can be interpreted by the application processor  406 B, which can configure the WPAN wireless circuitry  404 B and/or the WLAN wireless circuitry  402 B according to the user inputs. In some embodiments, the WLAN wireless circuitry  402 B can be enabled but operate in a power reduced mode or in a dormant state until required. In an embodiment, the WPAN wireless circuitry  404 B can be enabled but operate in a power efficient mode, e.g., by enabling a receive signal chain of the WPAN wireless circuitry  404 B to scan for messages according to a particular wireless communication protocol. In an embodiment, the receive signal chain of the WPAN wireless circuitry  404 B can operate in accordance with a BTLE wireless communication protocol. In an embodiment, the WPAN wireless circuitry  404 B can scan for messages using the BTLE wireless communication protocol only when the user enables a Bluetooth wireless communication protocol. In another embodiment, the WPAN wireless circuitry  404 B can scan for BTLE messages as a default configuration of operating system software of the scanning wireless communication device  102 B. The scanning wireless communication device  102 B can scan for BTLE advertising messages as a background process. In some embodiments, scanning can occur irrespective of a powered state of the scanning wireless communication device  102 B. In some embodiments, the scanning wireless communication device  102 B can scan for BTLE advertising messages when operating on battery power and not connected to an external power supply. In some embodiments, the scanning wireless communication device  102 B can scan for BTLE advertising messages when a display of the scanning wireless communication device  102 B is off. In some embodiments, a user of the scanning wireless communication device  102 B can configure under what conditions the WPAN wireless circuitry  404 B can scan for BTLE advertising messages. 
     A user of the broadcasting wireless communication device  102 A can provide an indication through the IO block  408 A of availability of a wireless communication service, e.g., by initiating an inquiry for nearby compatible wireless communication devices  102  with which to form a wireless connection through which to transfer information. In an embodiment, the user of the broadcasting wireless communication device  102 A enables a file sharing communication service by providing a setting through the IO block  408 A of the broadcasting wireless communication device  102 A, e.g., as indicated by action {circle around (1)} in  FIG. 5 . The application processor  406 A of the broadcasting wireless communication device  102 A can configure the WPAN wireless circuitry  404 A to enable broadcast transmission of one or more messages, e.g., advertising messages, in accordance with a WPAN wireless communication protocol. The application processor  406 A of the broadcasting wireless communication device  102 A can also configure the WLAN wireless circuitry  402 A and/or the WPAN wireless circuitry  404 A of the broadcasting wireless communication device  102 A to listen for messages communicated in return from other wireless communication devices  102  in response to the broadcast advertising messages transmitted through the WPAN wireless circuitry  404 A. Configuration of the WLAN wireless circuitry  402 A and/or the WPAN wireless circuitry  404 A by the application processor  406 A can be indicated by the action {circle around (2)} shown in  FIG. 5 . The WPAN wireless circuitry  404 A can transmit advertising messages in accordance with a WPAN wireless communication protocol, e.g., a BTLE WPAN wireless communication protocol, as indicated by action {circle around (3)} in  FIG. 5 . The advertising messages broadcast by the WPAN wireless circuitry  404 A of the broadcasting wireless communication device  102 A can include information that identifies one or more of: a manufacturing company associated with the broadcasting wireless communication device  102 A, a user of the broadcasting wireless communication device  102 A, a wireless communication service offered by the broadcasting wireless communication device  102 A, or aspects of the particular broadcasting wireless communication device  102 A. In an embodiment, the advertising messages include a manufacturing identification field, a communication service identification field, and a user identification field. 
     As described above, the scanning wireless communication device  102 B can listen for “advertising” messages by enabling a receive signal chain of the WPAN wireless circuitry  404 B. In an embodiment, the WPAN wireless circuitry  404 B receives and filters messages that are communicated according to a WPAN wireless communication protocol, e.g., a BTLE wireless communication protocol. Scanning for messages by the WPAN wireless circuitry  404 B of the scanning wireless communication device  102 B can be indicated by the action {circle around (4)} in  FIG. 5 . A receive signal chain of the WPAN wireless circuitry  404 B can filter received messages according to information contained in the received messages. In an embodiment, the scanning wireless communication device  102 B identifies one or more messages that contain values that satisfy a set of matching filter criteria. In an embodiment, the WPAN wireless circuitry  404 B retains (and/or continues to process) received messages in which select information matches a set of matching filter criteria and discards (and/or ignores) received messages that do not match the set of matching filter criteria. In an embodiment, the WPAN wireless circuitry  404 B filters the received messages to retain (and/or further process) only those received messages that match particular values (or sets of values) for a manufacturing company and/or for a communication service. In an embodiment, the manufacturing company value can be determined by examining contents of a manufacturing identification field included in the received messages. In an embodiment, the communication service advertised by the broadcasting wireless communication device  102 A can be determined by examining contents of a communication service identification field included in the received messages. In response to receiving a message that matches to a particular value (or set of values) contained in the manufacturing identification field and/or the communication service identification field, the WPAN wireless circuitry  404 B can provide an indication to the application processor  406 B of the scanning wireless communication device  102 B. In an embodiment, the WPAN wireless circuitry  404 B can extract additional information from one or more received messages that satisfy the set of matching filter criteria and can provide the extracted information to the application processor  406 B. The WPAN wireless circuitry  404 B can continue to process incoming received messages according to the WPAN wireless communication protocol, after providing the indication and information to the application processor  406 B. The actions of the WPAN wireless circuitry  404 B to filter, compare, and provide indications and/or information when a match occurs to the application processor  406 B can be indicated by the action {circle around (5)} in  FIG. 5 . 
     The application processor  406 B of the scanning wireless communication device  102 B can exit a power reduced or dormant state in response to receiving an indication from the WPAN wireless circuitry  404 B of one or more received messages that include information with values that match a set of matching filter criteria. The application processor  406 B can obtain additional information extracted by the WPAN wireless circuitry  404 B contained in the received “matching” message. In some embodiments, the WPAN wireless circuitry  404 B transfers a portion of the received “matching” message to the application processor  406 B. In some embodiments, the WPAN wireless circuitry  404 B transfers the entire received “matching” message to the application processor  406 B for further processing. The application processor  406 B can compare additional information extracted from the received “matching” message to information stored in (and/or associated with the scanning wireless communication device  102 B). In an embodiment, the application processor  406 B can compare a set of encrypted user identification values extracted from the received “matching” message to a local set of encrypted user identification values stored in (and/or associated with) the scanning wireless communication device  102 B. The broadcasting wireless communication device  102 A can include encrypted user identification information in the broadcast advertising message, e.g., a set of encrypted email addresses, a set of encrypted mobile device numbers, a set of encrypted login identifiers, or a combination of these. In some embodiments, the encrypted user identification information provided in the broadcast advertising message is derived from a contact list and/or an address book in (and/or associated with) the broadcasting wireless communication device  102 A (and/or with a user thereof) The scanning wireless communication device  102 B can compare a comparable local set of encrypted user identification values to the encrypted user identification information extracted from the received “matching” message to determine if the broadcasting wireless communication device  102 A is “known” to the scanning wireless communication device  102 B. In some embodiments, the local set of encrypted user identification information used for comparing by the scanning wireless communication device  102 B is derived from a local contact list and/or a local address book in (and/or associated with) the scanning wireless communication device  102 B (and/or with a user thereof.) 
     The encrypted user identification information included in the broadcast advertising message by the broadcasting wireless communication device  102 A can identify uniquely a user of the broadcasting wireless communication device  102 A and/or the broadcasting wireless communication device  102 A itself. The scanning wireless communication device  102 B can compare the encrypted user identification information associated with the broadcasting wireless communication device  102 B to a local set of encrypted user identification information associated with the scanning wireless communication device  102 A. In an embodiment, the local set of encrypted user identification information includes a set of encrypted email addresses, a set of encrypted mobile device numbers, a set of encrypted login identifiers, or a combination of these. In an embodiment, the email addresses, mobile device numbers, and/or login identifiers are included in a contact list and/or an address book of the scanning wireless communication device  102 B. In an embodiment, encrypted user identification information includes cryptographic hashes of information stored in the contact list and/or the address book of the scanning wireless communication device  102 B. The scanning wireless communication device  102 B can “identify” the broadcasting wireless communication device  102 A as “known” or “compatible” when at least a portion of the encrypted user identification information extracted from the received “matching” advertising message matches to a portion of the local encrypted user identification information. In a representative embodiment, the scanning wireless communication device  102 B compares the cryptographic hashes of information stored in a contact list (or a select portion of the contact list) and/or an address book (or a select portion of the address book) to cryptographic hashes associated with the broadcasting wireless communication device  102 B extracted from the received “matching” advertising message. Extracting and/or comparing information by the application processor  406 B can be indicated by the action {circle around (6)} in  FIG. 5 . 
     When the scanning wireless communication device  102 B locates a compatible broadcasting wireless communication device  102 A (e.g., by matching particular manufacturing identification field information) offering a compatible wireless communication service (e.g., by matching particular communication service identification field information) that is also known to the scanning wireless communication device  102 B (e.g., by matching particular encrypted user identification field information), the application processor  406 B can provide an indication of the located broadcasting wireless communication device  102 A and/or the communication service offered to the user of the scanning wireless communication device  102 B through the IO block  408 B. In an embodiment, the application processor  406 B provides user identification information and communication service information offered by the broadcasting wireless communication device  102 A to the user of the scanning wireless communication device  102 B through the IO block  408 B, e.g., by displaying unencrypted user identification information associated with the broadcasting wireless communication device  102 A and the communication service offered by the broadcasting wireless communication device  102 A. In an embodiment, the user of the scanning wireless communication device  102 B can respond to the displayed information by providing an acceptance or rejection of the offered wireless communication service offered by the broadcasting wireless communication device  102 A. Display of information through the IO block  408 B and reception of user input in response to the display of information through the IO block  408  can be indicated by the action {circle around (7)} in  FIG. 5 . 
     The application processor  406 B can enable the WLAN wireless circuitry  402 B of the scanning wireless communication device  102 B to establish a connection with the broadcasting wireless communication device  102 A in response to receiving an acceptance from the user of the scanning wireless communication device  102 B through the IO block  408 B. In an embodiment, the application processor  406 B can extract information from the received “matching” message to assist with establishing the connection to the broadcasting wireless communication device  102 A through the WLAN wireless circuitry  402 B. Enabling the WLAN wireless circuitry  402 B to establish a connection in accordance with a WLAN wireless communication protocol to the broadcasting wireless communication device  102 A can be indicated by the action {circle around (8)} in  FIG. 5 . 
     The WLAN wireless circuitry  402 A of the broadcasting wireless communication device  102 A can respond to the WLAN wireless circuitry  402 B of the scanning wireless communication device  102 B to establish a direct peer-to-peer WLAN connection, which can be indicated by the action {circle around (9)} in  FIG. 5 . The application processor  406 A of the broadcasting wireless communication device  102 A can communicate with the application processor  406 B of the scanning wireless communication device  102 B in order to establish an application layer connection over the direct peer-to-peer WLAN connection through which information can be transferred from the broadcasting wireless communication device  102 A to the scanning wireless communication device  102 B, e.g., using the communication service indicated in the broadcast advertising message. 
     The sequence of actions  500  indicated in  FIG. 5  can provide for a method and/or a mechanism to locate compatible wireless communication devices  102  with which to transfer information. The scanning wireless communication device  102 B can remain in a power reduced state with only portions of the WPAN wireless circuitry  404 B enabled to scan for messages and compare information in received messages to filter out extraneous messages and extract useful information to provide to the application processor  406 B when a match that satisfies a set of matching filter criteria occurs. The application processor  406 B can process additional information from the received messages, and when a match occurs alert a user of the scanning wireless communication device  102 B. In response to acceptance from the user of the scanning wireless communication device  102 B, the application processor can enable the WLAN wireless circuitry  402 B to establish a WLAN connection with the broadcasting wireless communication device  102 A. The received messages can include information to assist with setting up a WLAN connection to the broadcasting wireless communication device  102 A. The WLAN wireless circuitry  402 A of the broadcasting wireless communication device  102 A can be ready to establish the WLAN connection to the scanning wireless communication device  102 B. Thus, in some embodiments, the WLAN wireless circuitries  402 A/ 402 B can be enabled when a compatible match occurs. 
       FIG. 6  illustrates a representative format for an advertising message  600  communicated through a wireless network to advertise information to compatible wireless communication devices  102 . The advertising message  600  can be transmitted by the broadcasting wireless communication device  102 A and received by the scanning wireless communication device  102 B. The advertising message  600  can include a standardized initial set of information fields, e.g., a flag or preamble followed by a manufacturing identification (MFG ID) field  602 . In an embodiment, the advertising message  600  is formatted in accordance with a Bluetooth wireless communication protocol, e.g., a BTLE wireless communication protocol. The advertising message  600  can also include a customized set of information fields, e.g., a communication service identification (SVC ID) field  604 , a length (LEN) field, and a data information field  606 . The data information field  606  of the advertising message  600  can include one or more fields that can assist in determining compatibility between wireless communication devices  102  and/or for establishing connections between compatible wireless communication devices  102 . The data field  606  can include information for assisting to establish a wireless local area network connection in a WLAN field  608 . The data field  606  can also include encrypted user identification information in a USER ID field  610 . The data field  606  can also include other information in one or more additional fields illustrated as an OTHER field in  FIG. 6 . In an embodiment, WPAN wireless circuitry  404 B, e.g., a BLTE WPAN wireless receiver, in a scanning wireless communication device  102 B can scan for messages that are formatted in accordance with a WPAN wireless communication protocol. The WPAN wireless circuitry  404 B of the scanning wireless communication device  102 B can retain messages that include particular values for the MFG ID field  602  and discard (or ignore) messages that do not include the particular values. In an embodiment, the scanning wireless communication device  102 B can filter received messages for those that satisfy a set of filter matching criteria, e.g., having particular values in one or more of the fields. In some embodiments, the scanning wireless communication device  102 B can retain messages from broadcasting wireless communication devices  102 B for a particular manufacturing company (or set of manufacturing companies) and ignore one or more other messages. In an embodiment, the MFG ID field  602  includes information formatted according to a BTLE wireless communication protocol, e.g., a value that corresponds to a particular company as specified by the Bluetooth SIG. In an embodiment, the MFG ID field  602  can indicate the broadcasting wireless communication device  102 A is associated with a manufacturing company incorporated as Apple Inc. In an embodiment, the scanning wireless communication device  102 B searches for messages from broadcasting wireless communication devices having a MFG ID field  602  value that matches to a manufacturing company associated with the scanning wireless communication device  102 B. In an embodiment, the WPAN wireless circuitry  404 B of the scanning wireless communication device  102 B can compare values contained in the SVC ID field  604  to a set of one or more communication service values to determine if the scanning wireless communication device  102 B supports the advertised communication service as indicated in the SVC ID field  604  of the advertising message broadcast by the broadcasting wireless communication device  102 A. In an embodiment, the WPAN wireless circuitry  404 B of the scanning wireless communication device  102 B can retain messages that match particular values for the SVC ID field  604  in addition to matching the MFG ID field  602 . In an embodiment, the particular values included in the SVC ID field  604  can indicate a particular file sharing service, a particular printing service, a particular media streaming service, or a combination of these. In an embodiment, the SVC ID field  604  can indicate an AirDrop®, AirPrint™, or AirPlay® communication service provided by software on products of Apple Inc. 
     As described herein, the WPAN wireless circuitry  404 B of the scanning wireless communication device  102 B can provide the received message (when a match of the MFG ID field  602  and/or the SVC ID field  604  occurs), or portions of the received message, to the application processor  406 B. The application processor  406 B can extract and/or examine additional information in the received message, e.g., contained in a custom data field  606 . In an embodiment, the application processor  406 B analyzes information in the USER ID field  610 , e.g., comparing encrypted user identification information contained in the USER ID field  610  to local encrypted user identification information. In an embodiment, the USER ID field  610  of the message  600  includes cryptographic hashes of information about the broadcasting wireless communication device  102 A and/or a user of the broadcasting wireless communication device  102 A. In an embodiment, the USER ID field  610  includes cryptographic hashes of email addresses, mobile directory numbers, and/or login identifiers associated with the broadcasting wireless communication device  102 A and/or a user thereof. In an embodiment, the USER ID field  610  includes encrypted information derived from a contact list and/or an address book stored in and/or associated with the broadcasting wireless communication device  102 A (and/or a user thereof.) In an embodiment, the user of the broadcasting wireless communication device  102 A specifies information to include in the USER ID field  610  of the advertising messages  600 . In an embodiment, software executed on the application processor  406 A encrypts one or more of: an email address, a mobile directory number, or a login identifier to include in the USER ID field  610  of the advertising message  600 . The application processor  406 B of the scanning wireless communication device  102 B can compare the encrypted information extracted from the USER ID field  610  to a set of encrypted information stored in (and/or associated with) the scanning wireless communication device  102 B and/or a user thereof. In an embodiment, software executed on the application processor  406 B encrypts one or more of: a set of email addresses, a set of mobile directory numbers, or a set of login identifiers for a contact list and/or an address book stored in and/or associated with the scanning wireless communication device  102 B. In an embodiment, the application processor  406 B forms a set of cryptographic hashes associated with information contained in or derived from a contact list and/or an address book of the scanning wireless communication device  102 B. In an embodiment, the application processor  406 B of the scanning wireless communication device  102 B compares cryptographic hashes extracted from the USER ID field  610  of the received message (and therefore associated with the broadcasting wireless communication device  102 A) to cryptographic hashes for information of the contact list and/or address book of the scanning wireless communication device  102 B. In some embodiments, when at least a portion of the cryptographic hashes extracted from the USER ID field  610  match a portion of the cryptographic hashes associated with the scanning wireless communication device  102 B, the application processor  406 B informs the user of the scanning wireless communication device  102 B, e.g., through a IO block  408 B, of a nearby compatible broadcasting wireless communication device  102 A that is offering a compatible wireless communication service, e.g., as indicated in the SVC ID field  604 , to the scanning wireless communication device  102 B, and is “known” to the scanning wireless communication device  102 B, e.g., as indicated by information in the USER ID field  610 . 
       FIG. 7  illustrates a communication flow chart  700  between two wireless communication devices  102 A and  102 B to discover each other using a first wireless network and subsequently to establish a connection and share data using a second wireless network. In a first step, in some embodiments, a user of a scanning wireless communication device  102 B can provide an input through an IO block  408 B that can determine scanning settings for the scanning wireless communication device  102 B. In an embodiment, the user determines whether a receive signal chain of the WPAN wireless circuitry  404 B in the scanning wireless communication device  102 B is enabled. The user inputs can be received through the IO block  408 B and interpreted by software (e.g., by elements of an operating system and/or an application) in the application processor  406 B of the scanning wireless communication device  102 B. As illustrated in  FIG. 7 , an application level (or operating system) level setting can indicate enabling a scanning function which can be communicated to a lower level wireless software function that can communicate with the WPAN wireless circuitry  404 B of the scanning wireless communication device  102 B. A receive signal chain of the WPAN wireless circuitry  404 B can be turned on to receive messages (e.g., as indicated by the “RX ON” label in  FIG. 7 ). In an embodiment, the receive signal chain can listen for advertising messages according to a BTLE wireless communication protocol. In some embodiments, enabling the WPAN wireless circuitry  404 B can occur without user input (e.g., based on default settings and/or operating conditions of the scanning wireless communication device  102 B). 
     In parallel to actions undertaken by the scanning wireless communication device  102 B, a user of a broadcasting wireless communication device  102 A can provide input through an IO block  408 A indicating availability of a wireless communication service, e.g., by starting a file sharing service (or other communication service) as indicated by the “SHARE” label in  FIG. 7 . In an embodiment, the user selects to share a particular set of information, e.g., one or more files, available on (or associated with) the broadcasting wireless communication device  102 A. An application (and/or operating system software) executed by the application processor  406 A of the broadcasting wireless communication device  102 A, in response to the user input received through the IO block  408 A, can provide user identification (UID) information to associate with an advertising message to broadcast availability of the wireless communication service. In an embodiment, the application processor  406 A of the broadcasting wireless communication device  102 A determines the UID information based on a user of the scanning wireless communication device  102 A (e.g., a registered owner, default user information, a login identifier, a mobile directory number, an email address, or other information by which a user can be uniquely identified). In an embodiment, the UID information includes a set of UID information (e.g., a set of email addresses, a set of mobile directory numbers, a set of login identifiers, or a combination of these.) 
     In an embodiment, the application and/or operating system software provides the UID information to a wireless proxy application software function. The wireless proxy application software function, executing on the application processor  406 A, can provide an encrypted version of the UID information along with an indication to transmit the encrypted UID information to the WPAN wireless circuitry  404 A of the broadcasting wireless communication device  102 A. In an embodiment, the encrypted version of the UID information includes cryptographic hashes of the UID information. The application processor  406 A can enable the WPAN wireless circuitry  404 A and/or the WLAN wireless circuitry  402 A (or portions thereof) of the broadcasting wireless communication device  102 A to operate. The WPAN wireless circuitry  404 A can format and broadcast a message (or obtain from the application processor  406 A a formatted message) to advertise availability of the wireless communication service. In an embodiment, the message is formatted and broadcast in accordance with a WPAN wireless communication protocol, e.g., a BTLE wireless communication protocol. In an embodiment, the broadcast advertising message includes all or part of the encrypted UID information in a user identification field of the message. In an embodiment, the message also includes a communication service identification field that includes a value indicating the wireless communication service available from the broadcasting wireless communication device  102 A. In an embodiment, the message also includes a manufacturing identification field that includes a value identifying a manufacturing company associated with the broadcasting wireless communication device  102 A. In an embodiment, the value in the manufacturing identification field identifies that the broadcasting wireless communication device  102 A is associated with the manufacturing company Apple Inc. 
     The WPAN wireless circuitry  404 B of the scanning wireless communication device  102 B can receive the broadcast advertising message transmitted by the broadcasting wireless communication device  102 A and can compare information contained in the broadcast advertising message to particular values to determine whether a match based on a set of matching filter criteria occurs. In an embodiment, the WPAN wireless circuitry  404 B compares values in the manufacturing identification field and the communication service identification field to determine compatibility of capabilities of the scanning wireless communication device  102 B to the broadcasting wireless communication device  102 A. In an embodiment, the WPAN wireless circuitry  404 B ignores received advertising messages that do not match certain values in the manufacturing identification field and/or the communication service identification field. In an embodiment, the WPAN wireless circuitry  404 B retains received messages that match certain values in the manufacturing identification field, the communication service identification field or both fields. In an embodiment, the WPAN wireless circuitry  404 B only retains received messages that match certain values in both the manufacturing identification field and the communication service identification field. 
     In an embodiment, the WPAN wireless circuitry  404 B provides an indication of a matching advertising message received by the WPAN wireless circuitry  404 B to the application processor  406 B of the scanning wireless communication device  102 B. The WPAN wireless circuitry  404 B can provide all or part of the matching advertising message to the application processor  406 B. In an embodiment, the WPAN wireless circuitry  404 B provides encrypted user information extracted from the user identification field of the matching advertising message to the application processor  406 B of the scanning wireless communication device  102 B. In some embodiments, the WPAN wireless circuitry  404 B provides additional information extracted from the advertising message, e.g., information about the WLAN wireless circuitry  402 A of the broadcasting wireless communication device  102 A included in the advertising message that can assist in establishing a WLAN connection between the scanning wireless communication device  102 B and the broadcasting wireless communication device  102 A. In some embodiments, the WPAN wireless circuitry  404 B also provides supplemental information associated with the matching advertising message, e.g., a measure of signal strength and/or signal quality of the matching advertising message, which can provide indirectly information about the signal path between the broadcasting wireless communication device  102 A and the scanning wireless communication device  102 B to the application processor  406 B of the scanning wireless communication device  102 B. In some embodiments, the WPAN wireless circuitry  404 B of the scanning wireless communication device  102 B receives broadcast advertising messages from one or more different broadcasting wireless communication devices  102 A and provides the supplemental information along with information extracted from matching advertising messages to the application processor  406 B of the scanning wireless communication device  102 B. In some embodiments, the application processor  406 B of the scanning wireless communication device  102 B estimates proximity of the broadcasting wireless communication device  102 A based at least in part on the supplemental information. In some embodiments, the WPAN wireless circuitry  404 B and/or other wireless circuitry in the scanning wireless communication device  102 B can use the supplemental information to determine characteristics of a communication path between the scanning wireless communication device  102 B and the broadcasting wireless communication device  102 A. 
     A wireless proxy software function and/or an application level software function, executed by the application processor  406 B of the scanning wireless communication device  102 B, can compare the encrypted user identification information extracted from the matching advertising message to a local set of encrypted user identification information stored in (and/or associated with) the scanning wireless communication device  102 B. The application processor  406 B can determine, using at least in part the encrypted user identification information extracted from the matching advertising message received by the WPAN wireless circuitry  404 B, whether the broadcasting wireless communication device  102 A is compatible with (and/or known by) the scanning wireless communication device  102 B (or a user thereof). In a representative embodiment, the application processor  406 B compares encrypted versions of information contained in a contact list and/or an address book of the scanning wireless communication device  102 B to the encrypted user identification information extracted from the matching advertising message received from the broadcasting wireless communication device  102 A. In an embodiment, the application processor determines a match occurs when at least one encrypted user identification element (e.g., a cryptographic hash of an email address, mobile directory number, login ID, or a combination of these) matches an encrypted user identification element stored in and/or associated with the scanning wireless communication device  102 B, (e.g., a cryptographic hash of an email address, mobile directory number, or login ID of a contact list, an address book, or portions thereof). When the application processor  406 B determines a match occurs, e.g., that a compatible broadcasting wireless communication device  102 A has been located, that a compatible wireless communication service is available from the broadcasting wireless communication device  102 A, and that the broadcasting wireless communication device  102 A (and/or a user thereof) is known to the scanning wireless communication device  102 B (and/or to a user thereof), the application processor  406 B can enable WLAN wireless circuitry  402 B of the scanning wireless communication device  102 B. In some embodiments, comparison of all or part of the encrypted information extracted from the matching advertising message to the local set of encrypted user information in the scanning wireless communication device  102 B can be offloaded from the application processor  406 B to wireless circuitry in the scanning wireless communication device  102 B. In some embodiments, the wireless circuitry can transition the application processor  406 B for a dormant state to an “awake” state when the wireless circuitry determines a match occurs, e.g., based on comparison of all of part of the encrypted user identification information extracted from an advertising message to the local set of encrypted user identification information. 
     The WLAN wireless circuitries  402 A/ 402 B of the wireless communication devices  102 A/ 102 B can subsequently establish a WLAN connection through which information can be transferred. In an embodiment, the application processor  406 B can use information about the WLAN wireless circuitry  402 A of the broadcasting wireless communication device  102 A extracted from the advertising message to assist in establishing the WLAN connection. In an embodiment, the advertising message can include a MAC address for the WLAN wireless circuitry  402 A of the broadcasting wireless communication device  102 A and/or a radio frequency channel identifier for the WLAN wireless circuitry  402 A. In an embodiment, an application level connection for a communication service can be established between applications executing on the application processors  406 A/ 406 B of the respective wireless communication devices  102 A/ 102 B. In an embodiment, the communication service established can be specified by the communication service identification field (SVC ID) of the matching advertising message received by the scanning wireless communication device  102 B from the broadcasting wireless communication device  102 A. In an embodiment, the WLAN connection is a peer-to-peer WLAN connection established between the wireless communication devices  102 A/ 102 B. In an embodiment, the application level connection provides for a communication service to transfer information between the wireless communication devices  102 A/ 102 B. In a representative embodiment, the application processors  406 A/ 406 B of the wireless communication devices  102 A/ 102 B execute software for a minimal or zero configuration networking that provides for service discovery through the WLAN connection, e.g., as offered by Bonjour software provided by Apple Inc. In a representative embodiment, a user of the scanning wireless communication device  102 B interacts with a user of the broadcasting wireless communication device  102 A to transfer information through a communication service indicated by the communication service identification field (SVC ID) of the advertising message received through the WPAN connection and subsequently discovered through the WLAN connection. Representative communication services include a file sharing service, e.g., AirDrop®, a printing service, e.g., AirPrint™, or a media streaming service, e.g., AirPlay®, (provided by software operating on products of Apple Inc.), and/or other communication services. In some embodiments, for a file sharing service, a user of one of the wireless communication devices  102 A/ 102 B can select a file through an IO block  408 A/ 408 B, and the selected file can transfer between the wireless communication devices  102 A/ 102 B. In some embodiments, for a printing service, a user of one of the wireless communication devices  102 A/ 102 B can select a file through an IO block  408 A/ 408 B, and the selected file can transfer to be printed. In some embodiments, for a media streaming service, a user of one of the wireless communication devices  102 A/ 102 B can select a file or other indicator of a media stream (e.g., an audio stream, a video stream, or equivalent) and transfer of the media stream can be initiated. Additional representative communication services can include gaming and tethering services that can operate over connections between the wireless communication devices  102 A/ 102 B. 
       FIG. 8  illustrates a flowchart  800  according to an example method for discovering a wireless communication device  102  and using a wireless network to establish a connection and to transfer information. In a first step  802 , in some embodiments, a first wireless communication device  102 B can obtain one or more user preferences for settings of wireless capabilities of the first wireless communication device  102 B. In some embodiments, the settings directly control operating states of wireless local area network (WLAN) wireless circuitry, wireless personal area network (WPAN) wireless circuitry, and/or wireless wide area network (WWAN) wireless circuitry of the first wireless communication device  102 B. In an embodiment, the settings indirectly control operating states of one or more wireless circuitries of the first wireless communication device  102 B, e.g., by providing a balance between power savings and responsiveness to user actions. In a second step  804 , a first wireless circuitry of the first wireless communication device  102 B is configured to scan for messages communicated in accordance with a first wireless communication protocol. In a representative embodiment, the first wireless communication protocol is a WPAN wireless communication protocol, e.g. a Bluetooth Low Energy (BTLE) wireless communication protocol. In a subsequent step  806 , the first wireless communication device  102 B identifies a message received during scanning that includes a manufacturing identification field and a communication service identification field, the message originating from a second wireless communication device  102 A. In step  808 , the first wireless communication device  102 B determines whether particular values included in the manufacturing identification field and in the communication service identification field match to a first identification value and to a second identification value respectively. In an embodiment, the first ID value identifies the second wireless communication device  102 A as a device associated with a particular manufacturing company, e.g., the manufacturing company Apple Inc. In an embodiment, the first ID values identifies the second wireless communication device  102 A as a device associated with a particular manufacturing company that is also associated with the first wireless communication device  102 B. In an embodiment, the second ID value identifies a data sharing communication service advertised by the message received from the second wireless communication device  102 A. In some embodiments, the data sharing communication service is a file sharing service, a file printing service, or a media streaming service. When the particular values of the manufacturing identification field and the communication service identification field do not match the first and second identification values respectively, the method ends. When the particular values of the manufacturing identification field and the communication service identification field do match the first and second identification values respectively, the first mobile wireless communication device  102 B, in step  810 , extracts one or more encrypted user identification values from a user identification field of the message received from the second wireless communication device  102 A. In step  812 , the first wireless communication device  102 B compares the extracted encrypted user identification values received in the message from the second wireless communication device  102 A to a set of local encrypted user identification values associated with the first wireless communication device  102 B. In an embodiment, the set of encrypted user identification values extracted from the message correspond to a set of identifiers that uniquely identify a user of the second wireless communication device  102 A, uniquely identify the second wireless communication device  102 A, or uniquely identify both the user of the second wireless communication device  102 A and the second wireless communication device  102 A. In some embodiments, the set of identifiers include a set of electronic mail addresses, a set of mobile directory numbers, a set of login identifiers, or a combination of these. When at least one encrypted user identification value extracted from the message received from the second wireless communication device  102 A matches to at least one local encrypted user identification value in the set of local encrypted user identification values associated with the first wireless communication device  102 B, the first wireless communication device  102 B can conclude that the second wireless communication device  102 A (and/or a user thereof) is “known” to the first wireless communication device  102 B (and/or to a user thereof). When the second wireless communication device  102 A is “not known” to the first wireless communication device  102 B, the method can end. When the second wireless communication device  102 A is “known,” in step  814 , the first wireless communication device  102 B can establish a connection to the second wireless communication device  102 A, e.g., in accordance with a second wireless communication protocol. In a representative embodiment, the second wireless communication protocol is a WLAN wireless communication protocol. In some embodiments, the WLAN wireless communication protocol is a Wi-Fi wireless communication protocol. In some embodiments, the WLAN wireless communication protocol provides for a peer-to-peer WLAN connection between the first wireless communication device  102 B and the second wireless communication device  102 A. In some embodiments, establishing the connection in accordance with the second wireless communication protocol to the second wireless communication device  102 A, includes waking radio frequency (RF) wireless circuitry in the first wireless communication device  102 B from a dormant power-reduced state to an active state, and establishing a direct peer-to-peer WLAN connection through the RF wireless circuitry to the second wireless communication device  102 A in accordance with the second wireless communication protocol. In some embodiments, in step  816 , the first mobile wireless communication device  102 B transmits to the second wireless communication device  102 A information to establish an application layer connection for a communication service identified by the second identification value in the communication service identification field of the received message. In some embodiments, the application layer connection supports discovery of communication services and/or wireless communication devices to one another in order to transfer information, e.g., through a file sharing or other data sharing communication service. 
       FIG. 9  illustrates a flowchart  900  according to another example method for a first wireless communication device  102 B to discover a second wireless communication device  102 A, to establish a connection between them, and to transfer information between them. In an embodiment, the first wireless communication device  102 B includes non-volatile storage, a processor (e.g., application processor  406 ), and wireless circuitry (e.g., WPAN wireless circuitry  404  and/or WLAN wireless circuitry  402 ). In step  902 , the first wireless communication device  102 B stores a local set of user information, all or at least a portion thereof, in the non-volatile storage (and/or in associated storage connected to the wireless communication device  102 B). In some embodiments, the local set of user information corresponds to a contact list, an address book, or both. In some embodiments, all or portions of the local set of user information is stored in an unencrypted form, an encrypted form, or both. In some embodiments, the encrypted form includes cryptographic hashes of the user information. In step  904 , the first wireless communication device  102 B scans, using at least a first portion of the wireless circuitry, for messages communicated in accordance with a first wireless communication protocol. In step  906 , the first wireless communication device  102 B identifies a message received by the wireless circuitry from the second wireless communication device  102 A. In some embodiments, the received message includes one or more fields containing values that satisfy a set of matching filter criteria. In some embodiments, the message is formatted according to the message format  600  illustrated in  FIG. 6 . In some embodiments, the set of matching filter criteria compare values contained in one or more of the fields, e.g., fields as illustrated in the message format  600  in  FIG. 6 . In some embodiments, the first wireless communication device  102 B discards and/or ignores messages that do not satisfy the set of matching filter criteria. In step  908 , the first wireless communication device  102 B extracts a set of encrypted user identification values associated with the second wireless communication device  102 A from the received message. In step  910 , the first wireless communication device  102 B compares the set of encrypted user identification values extracted from the message to an encrypted version of at least a portion of the local set of user information stored in the non-volatile storage. When a first encrypted user identification value, in the set of encrypted user identification values extracted from the message received from the second wireless communication device  102 A, matches a second encrypted user identification value in the encrypted version of the at least a portion of the local set of user information, in step  912 , the first wireless communication device  102 B establishes, using at least a second portion of the wireless circuitry, a connection to the second wireless communication device  102 A in accordance with the second wireless communication protocol. When the first encrypted user identification value, in the set of encrypted user identification values extracted from the message received from the second wireless communication device  102 A, does not match the second encrypted user identification value in the encrypted version of the at least a portion of the local set of user information, the method ends. 
       FIG. 10  illustrates a further representative method  1000  to discover a wireless communication device and to establish a connection with the discovered wireless communication device. In step  1002 , a scanning wireless communication device  102 B receives a message from a broadcasting wireless communication device  102 A. In some embodiments, the message includes an indicator of a communication service and one or more user identification values associated with the broadcasting wireless communication device  102 A. In step  1004 , the scanning wireless communication device  102 B compares the one or more user identification values in the message to a local set of user identification values. In some embodiments, the local set of user identification values is associated with the scanning wireless communication device  102 B and/or with a user thereof. In step  1006 , the scanning wireless communication device  102 B determines whether a first user identification value in the one or more user identification values matches a second user identification value in the local set of user identification values. When no match occurs, the method ends. When a match occurs, in step  1008 , the scanning wireless communication device  102 B establishes a connection to the broadcasting wireless communication device  102 A and communicates with the broadcasting wireless communication device  102 A according to the communication service indicated in the received message. In some embodiments, the message is broadcast and received in accordance with a Bluetooth Low Energy (BTLE) wireless communication protocol. In some embodiments, the connection established between the scanning wireless communication device  102 B and the broadcasting wireless communication device  102 A operates in accordance with a Wi-Fi wireless communication protocol. 
     Representative applications of systems, methods, apparatuses, and computer program products according to the present disclosure are described in this section hereinabove. These examples are being provided solely to add context and aid in the understanding of the described embodiments. It will thus be apparent to one skilled in the art that the described embodiments may be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the described embodiments. Other applications are possible, such that the following examples should not be taken as limiting. 
     In the detailed description provided, references are made to the accompanying drawings, which form a part of the description and in which are shown, by way of illustration, specific embodiments in accordance with the described embodiments. Although these embodiments are described in sufficient detail to enable one skilled in the art to practice the described embodiments, it is understood that these examples are not limiting; such that other embodiments may be used, and changes may be made without departing from the spirit and scope of the described embodiments. 
     Software, hardware, or a combination of hardware and software can implement various aspects of the described embodiments. The described embodiments can also be encoded as computer program code on a non-transitory computer readable medium. The non-transitory computer readable medium is any data storage device that can store data that can thereafter be read by a computer system. Examples of the non-transitory computer readable medium include read-only memory, random-access memory, CD-ROMs, DVDs, magnetic tape and optical data storage devices. The computer program code can also be distributed over network-coupled computer systems so that the computer program code is stored and executed in a distributed fashion. 
     The various aspects, embodiments, implementations or features of the described embodiments can be used separately or in any combination. The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the described embodiments. However, it will be apparent to one skilled in the art that the specific details are not required in order to practice the described embodiments. Thus, the foregoing descriptions of the specific embodiments described herein are presented for purposes of illustration and description. They are not targeted to be exhaustive or to limit the embodiments to the precise forms disclosed. It will be apparent to one of ordinary skill in the art that many modifications and variations are possible in view of the above teachings. 
     The advantages of the embodiments described are numerous. Different aspects, embodiments or implementations can yield one or more of the following advantages. Many features and advantages of the present embodiments are apparent from the written description and, thus, it is intended by the appended claims to cover all such features and advantages of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, the embodiments should not be limited to the exact construction and operation as illustrated and described. Hence, all suitable modifications and equivalents can be resorted to as falling within the scope of the invention.