WO2016068791A1

WO2016068791A1 - Methods and apparatus for transmission of data to a mobile device

Info

Publication number: WO2016068791A1
Application number: PCT/SG2014/000511
Authority: WO
Inventors: Weng Wah Chng; Ching Yau KANG
Original assignee: Citrine Wireless Pte Ltd
Priority date: 2014-10-31
Filing date: 2014-10-31
Publication date: 2016-05-06
Also published as: SG11201705316QA

Abstract

Methods and systems are described for transmitting data to a mobile device. The data may include the time according to a reference clock of a separate display system which displays a video. The mobile device can use the time to obtain, typically from an internal database, information relating to the video, such as the sound-track of the video or retail information relating to products referenced in the video. The data is transmitted using advertising channels of a personal area network. The network may use the Bluetooth LE technology, with certain data broadcast on channel (37) and different data on channel (39).

Description

Methods and Apparatus for Transmission of Data To A Mobile Device Field of the invention

The present invention relates to methods and systems for transmitting data to a mobile device at an appropriate time. Background of the invention

It is well known to provide a communications system which communicates by radio frequency (RF) signals with telecommunications devices which enter a predetermined area.

One example of this is the Bluetooth Low Energy (LE) system (BLE, also known as

Bluetooth Smart), which is a wireless personal area network technology, presently defined by a standard BLE 4.0. Compared to Classic Bluetooth, BLE is intended to provide considerably reduced power consumption and cost while maintaining a similar

communication range. It employs 40 2-MHz radio frequency (RF) channels. Within a channel, data is transmitted using Gaussian frequency shift modulation. The bit rate is 1 Mbit/s, and the maximum transmit power is 10 mW. The 40 RF channels are of two types: advertising channels (which are the channels labelled 37, 38 and 39) and data channels. Advertising channels are used for device discovery, connection establishment and broadcast transmission, whereas data channels are used for bidirectional communication between connected devices.

The advertising channels have been assigned centre frequencies that minimize overlap with IEEE 802.11 channels 1 , 6 and 11 , which are commonly used in several countries. When a device only needs to broadcast data, it transmits the data in advertising packets through the advertising channels. Any device that transmits advertising packets is called an advertiser. The transmission of packets through the advertising channels takes place in intervals of time called advertising events. Within an advertising event, the advertiser sequentially uses each advertising channel for packet transmission. Devices that only aim at receiving data through the advertising channels are called scanners.

Bidirectional data communication between two devices requires them to connect to each other. The creation of a connection between two devices is an asymmetric procedure by which an advertiser announces through the advertising channels that it is a connectable device, while the other device (referred to as an initiator) listens for such advertisements. When an initiator finds an advertiser, it may transmit a Connection Request message to the advertiser, which creates a point-to-point connection between the two devices. Both devices can then communicate by using the physical data channels. During an advertising event, identical data is broadcast on all three channels (channels 37, 38 and 39) simultaneously. A typical reception system (such as that used by systems employing the iOS and Android operating systems) contains RF receiving hardware which is turned to be sensitive to signals broadcast on any of channels 37, 38 and 39, so that in effect the received signal is the average of the data broadcast on the three advertising channels.

Among the many applications of BLE is proximity sensing by Apple-compatible devices, such as devices referred to as iBeacons™, an indoor proximity system marketed by Apple Inc. An iBeacon™ deployment consists of one or more iBeacon™ devices that each transmit their own respective unique identification number to the local area. Software on a receiving device may then look up the iBeacon™ and perform various functions, such as notifying the user. Receiving devices can also connect to the iBeacons™ to retrieve values from its GATT (generic attribute profile) service. iBeacons™ do not push notifications to receiving devices (other than their own identity). Fig. 1 shows a known application of this system. A plurality of iBeacons™ 1 are provided spaced apart in a public area such as a park. Each iBeacon™ is able to establish communication with a mobile device 3 in its proximity. Thus, if a user carries a mobile device 3 around the park, the mobile device 3 successively establishes connections with any iBeacon it encounters. Thus, the mobile device 3 may for example receive from the iBeacon signals containing messages to be transmitted to the user, for example sound and/or visual messages to broadcast/display to the user to tell him or her about corresponding portions of the park near the corresponding iBeacon.

This system suffers numerous problems, for example due to multipath signals which may exist between the mobile device 1 and the iBeacons. Furthermore, the present inventors have observed that whereas the data transmission on channel 37 is usually fairly reliable (to within plus or minus 3dB), channels 38 and 39 often experience clashes with Wi-Fi channels of other telecommunication systems, such that variations of 10-15dB commonly occur. This degrades the quality of the signals received by averaging the advertising channels.

Summary of the invention

The present invention relates to methods and systems for transmitting data to devices such as (but not limited to) mobile devices.

In a first aspect, the invention proposes in general terms that an area network transmits to mobile device(s) in a given area data indicating a time according to a reference clock. The mobile devices can use this information to transmit information to the operators of the mobile device.

The first aspect of the invention may be employed in a display system, in which a user can view a display screen which is not part of the mobile device, and the display system displays a video (e.g. a movie, or specific advertising material). For example, the display screen may be a public display screen (e.g. a movie screen in a public location, or a billboard).

Alternatively, it may be a private display screen (a personal computer screen, or a home television screen). The mobile device uses the time according to the reference clock to extract information from a database which is appropriate to the video. In a first example of this idea, the information is advertising information relating to products shown in the video. The user is enabled to make a command to obtain retail information about a product shown in the video. Upon registering the command, the mobile device obtains the information, which is selected from a database of retail information using the time according to the reference clock when the command was made (or during an interval prior to the command). Thus, the retail information can be selected to describe a product which was referenced in the video when the command was made (or shortly before).

In a second example of the idea, the information is a sound-track for the video. The mobile device stores the sound-track and generates audio sound to the user based on the time according to the reference clock, so that the sound is in sync with the video. Note that the sound-track stored in a given mobile device can be tailored to the corresponding user, e.g. in his or her own language. Thus, each of a number of users who speak different respective languages can each see the same publicly-displayed video, and each hear the sound-track in their own language.

The concept of using a mobile device to communicate with a server to obtain retail information in relation to a product shown at that time (or shortly earlier) on a separate display screen, or even to initiate a payment process in relation to such a product, contitutes a second independent aspect of the invention.

A third aspect of the invention (which can advantageously be combined with the first and second aspects, but which is not limited to them) proposes in general terms that the multiple advertising channels of an area network telecommunications system, are not used to encode identical information, and the mobile device obtains independent information from each of the advertising channels.

This is in contrast to the known system described above, in which the advertising channels transmit the same information, and the hardware averages the signals on the three channels before data is extracted. Since the channels may be subject to different levels of noise, averaging the signals received from the channels might actually produce data with a greater amount of noise than data received using only the channel with lowest amount of noise.

In one example of the second aspect of the invention, the data is transmitted using the advertising channels of the Bluetooth LE system. Channel 37 may be used as a major channel (e.g. for transmitting the reference clock signal) and another advertising channel (e.g. channel 39) can be used to transmit calibration information.

Brief description of the drawings

Embodiments of the invention will now be described for the sake of example only with reference to the following figures, in which:

Fig. 1 shows a known system comprising a plurality of beacons spaced out in a public place;

Fig. 2 shows a first embodiment of the invention;

Fig. 3 shows schematically the operation of a portion of a mobile device in the embodiment of Fig. 2;

Fig. 4 shows schematically packets transmitted in the system of Fig. 2;

Fig. 5, which is composed of Figs. 5(a) and 5(b), shows a possible way of using the bits of the data packets of Fig. 4; and

Fig. 6 shows a second embodiment of the invention.

Detailed description of the embodiments

Fig. 2 shows a first embodiment of the invention which in which a user associated with a mobile device 101 sees video images on a separate video display device 103 which is a portion of display system 105. The display device 103 may be a home display unit, such as a television, or it can be a public display system, such as a screen located in a public location, such as a street, and visible to passers-by in the street. The screen may for example be a billboard for displaying moving images containing advertising material. That is, the display device 103 may be one dedicated to displaying advertising images.

Typically, the video contains references to products (a term which is used here to refer both to physical products and to services). At different respective times, the video may include information associated with different respective products. For example, the video may be series of video advertisements for a respective plurality of different products. Substantially all of the video content may be adverts. Alternatively, only a portion of the video production may be advertising content. For example, the video may be a movie in which product placement occurs at a certain set of moments. Mobile device 101 receives a signal containing timing data encoding a reference clock synchronised with a timing of the display system 105. For example, the display system 105 may further include a server 107 which operates according to the reference clock (the server 107 may include the reference clock, or may receive clock signals from a separate reference clock), and which controls a transceiver 109 (such as a Bluetooth LE transceiver, as is assumed in the description below) for generating signals for transmission to the mobile unit 101 which encode the time shown by the reference clock at the moment that the signal is transmitted. The display system 105 further contains a database 111 (which is illustrated as a single database unit, although in practice it may be multiple database units which can all be assessed by the sever 107), storing the video which is to be displayed, and data which determines or records the respective times, according to the reference clock, at which specific portions of the video are displayed.

The mobile device 101 further contains an application operative to use the timing data in packets received from the transceiver 109 to extract timing information specifying the time according to the reference clock. The timing information may be utilized in a number of ways.

Firstly, the application permits the user to enter a command into the mobile unit 101 to extract retail information relating to a product which is being displayed by the display screen 103 at the time the command is entered. The retail information may include any one or more of pricing of the product, special retail offers relating to the product (e.g. if it is purchased in certain quantities, or if other pre-determined product(s) are purchased simultaneously), availability of the product, channels through which the product can be obtained, delivery times of the product through each channel, etc. The user may then choose to instigate a purchase process in which the product is purchased. Thus, there is provided a user experience in which the retail information is supplied on demand (i.e. "pulled" rather than "pushed").

In a variant of the embodiment, at times when a product is being referenced on the display screen, the mobile device may display on its own display screen an advert for the product, optionally including retail information (i.e. in this case the advert - and optionally retail information - is "pushed" to the mobile device 101 ). As in the embodiment, the user may then a command to obtain (further) retail information and/or initiate a purchase of the product.

The embodiment uses a database which specifies which product is referenced (shown) in the video at each of a plurality of portions of the video. For each of these portions, the time according to the reference clock is known. Thus, the time of the command according to the reference clock can be used to determine a corresponding product (one shown at the time of the command, or during a short interval before). Retail information about the product can then be obtained from another database (or a different portion of the same database).

For example, the application may itself contain both databases. In this case, the application itself can use the timing of the command to identify which product the command relates to, and accordingly provide retail information concerning that product to the user.

Alternatively, the application may, upon the command being entered, cause a query signal to be generated by the mobile device 101 and transmitted from the mobile device 101. The query signal contains information encoding the timing information of the reference clock signal at the time that the command was entered. In other words, the query signal can be used to determine what the time was shown by the reference clock at the time that the command was made.

The query signal may be transmitted to the transceiver 109 (or to another data network which the mobile device 101 can access), and forwarded to a server (the "query processing server") which is arranged to process the query signal, and to determine which portion of the video was displayed by the display screen 103 at the time that the command was made. If the portion of the video which was displayed by the display screen 03 at the time that the command was made is determined to be associated with a product being advertised, then the query-processing server may transmit to the user (e.g. to the mobile device 101 , or to an email address associated with the user) the retail information concerning the product.

The query-processing server may for example be the server 107, which uses the database 111 to make this determination.

Alternatively, the query-processing server may be another server 113, such as one operated by a commercially distinct organisation from the operator of the server 107. The server 1 13 may receive the query signal from the server 107 over the internet, for example. The server 13 has access to a database 1 15 which indicates what video the display system 103 generated at all times according to the reference clock, and time(s) according to the reference clock at which product(s) are referenced in the video. For example, the database 115 may contain data defining a timetable of what video is to be transmitted to by the display screen 103, and this data may be transmitted to the database 111 prior to the transmission of the video, to control the display system 105 to display video according to the specified timetable. Note that although the server 113 is illustrated in Fig. 1 as a distinct entity, in fact it may alternatively be constituted by a program which runs on the cloud (that is, a plurality of servers working in co-operation to collectively provide a computing environment for multiple independent software products to run).

A second way of using the timing information is if the mobile device 101 is arranged to generate audio sounds. The application may for example store a recorded soundtrack designed to accompany the video, and the mobile device may play the sound-track according to the timing information, to generate sound synchronized with the video. For example, if the video contains a character speaking, the sound may be the words which are spoken, and the sound may be generated so that the user hears the words as they are pronounced in the video.

In one specific form of this concept, there may be a plurality of users, and each may be associated with a respective mobile device 101. The applications on the respective mobile devices may be arranged to generate sound in different respective languages. Thus, each user receives a soundtrack which is appropriate for, and synchronized with, the video, in a different one of the respective languages. Thus it would be possible for a user who is a visitor to a certain country in which the display system 105 is located, to receive a sound- track in his or her own language and which is synchronised with the video displayed by the display system. The audio track would be transmitted to the mobile device 101 (e.g. from the server 115 before the display screen 103 displays the video, e.g. when the mobile device 01 detects that it is approaching an area containing the display system 105.

We now turn to a discussion of a preferred communication standard for transmitting data to the mobile device 101.

As mentioned above, the Bluetooth LE standard uses 40 RF channels of which only three (channels 37, 38 and 39) are used for advertising (i.e. establishing a connection between users). In the following description, channel 37 is referred to as the "major" channel, while channel 39 is referred to the "minor channel". The embodiment of Fig 1 can be implemented according to the Bluetooth LE standard, using the advertising channels to transmit to the mobile device 101 the information indicative of what video is being displayed by the display screen 103 and/or the timing data encoding the reference clock.

Preferably, the advertising channels are not used to transmit identical data. Since the major channel (channel 37) is more reliable than the other advertising channels, it can be used to transmit the most important information. The embodiment preferably transmits packets (e.g. containing different information) on channels 37 and 39 alternately. Since two channels are used, the system is less adversely affected if noise is indeed present on channel 37.

Preferably, the channel 38 is not used at all, since it is in the middle of the Wi-Fi band, and thus may be subject to much noise. Channel 39, by contrast, is at the edge of the Wi-Fi band.

The transceiver 109 is typically designed only to transmit signals on one frequency at a time. Preferably it contains a frequency modulator which alternately sets that transmission frequency as that of channels 37 and 39, and one packet is transmitted on each of the channels alternately. The mobile device 101 comprises RF signal circuitry as shown in Fig. 3. An aerial 117 of the mobile device is tuned to receive RF signals on any of the three advertising channels. The signal generated by the aerial is passed to an RF processing unit 119 where software determines whether a received packet has been transmitted. on the channel 37 or 39, extracts data from each packet, and generates two respective outputs representing the data transmitted on the advertising channels 37 and 39 respectively. One way for the software to distinguish which channel a given packet has been transmitted on is for each packet to contain a flag which indicates Which channel the next packet will be transmitted on. The software is able to decode this flag, and accordingly direct the data obtained from the next packets. Note that the hardware of the mobile device 01 is the same as in conventional devices. That is, the RF signal circuitry may be identical to that of existing Bluetooth LE devices, apart from software running in the processing unit 219. In existing Bluetooth LE design centres, the designer of the software of unit 2 9 is a different person from the designer of the hardware, and does not usually consider the limitations of the RF signal transmission process. This aspect of the embodiment therefore requires a change of perspective, i.e. giving the software designer responsibility for overcoming hardware limitations.

In one example, the server 105 sends signals on the major channel and minor channel alternately, and containing different information.

Specifically, the major channel is used to encode the title of the video, the time at which the video started, any pauses in the video, and the reference clock of the server 105.

A minor channel (such as channel 39) is used to broadcast information which specifies the timing of the reference clock more accurately, sufficient to determine the timing of the audio with an accuracy of milliseconds. Fig. 4 shows how packets are transmitted. A first packet ("Time Sync") is broadcast by the server 105 periodically (e.g. every second) on channel 37. A second type of packet

("Callibration") is broadcast by the server 105 on channel 39 between the time sync packets. Thus, Time Sync packets alternate with Callibration packets. There is a short interval between each packet and the next.

Using these two sorts of packets, the mobile device 101 is able to determine the time shown by the reference clock of the server 105 with an accuracy of below one second, and compare it with a local time on the mobile device 101. The can be used to check that the server 105 and mobile device 101 have synchronized clocks, or, if not, to configure the clock of the mobile device 101 to synchronise it with the reference clock of the server 105.

We now turn to a description of the detailed implementation of audio synchronisation. This provides a one-directional communication system, in which data is pushed to a mobile device such as device 101.

Each Bluetooth LE data packet contains three sections. First, there is a header portion, containing a UUID (universally unique identifier). Then there are two numbers, referred to as the major and minor numbers, which are both two bytes (a "higher byte" and a "lower byte"). That mean each takes value from 0 - 65,535. The embodiment can encode data into the two numbers in many ways to form a command and information broadcasting system.

One possibility is to use the first 8 bits of the higher byte of the master number to deliver command codes, while using the lower byte and the minor number to deliver different information related to the higher byte of the major number.

Fig. 5 shows another possibility. Fig. 5(a) shows the major number of a first type of packet in which the first bit of the high byte of the major number is a "1 " to indicate that the packet is of a type containing a "template". This is followed by two bits which are reserved (e.g. people implementing the embodiment may make use of these bits for whatever purpose they desire). Then there are 4 bits indicating the general location of the display screen 103 (e.g. a 4-bit code labelling a certain shopping mall), then a bit P which labels whether the video is currently playing or is paused. The low byte of the major number is an 8-bit "template", which may for instance encode how many videos the display screen 103 is being controlled to display, and with what timing. Fig. 5(b) shows the major number of another type of packet, in which the first bit of the high byte of the major number is a "0" to indicate that the packet is of a type not containing a template. The rest of the bits of the high byte have the same meaning as in Fig. 5(a), but in this case, the low byte may be composed of 4 bits which contain a code labelling a particular display screen of the general location (note that a single shopping mall may have multiple display screens, showing different respective videos) and the last four bits are data indicating which video this particular screen is displaying.

Note that the data transmission concept described above (i.e. the transmission of different data on one advertising channel from that on other advertising channels) is not limited to an embodiment such as that shown in Fig. 2. Instead, it can profitably be used in a system such as the prior art system shown in Fig. 3.

For example, it is possible to implement a system as shown in Fig. 1 with the beacons 1 generating data on the channels 37 and 39 alternately. Each of the mobile devices 3 in this case is provided with RF signal reception circuitry as shown schematically in Fig. 2. Fig. 6 shows a further embodiment of the invention, which does not employ the Bluetooth LE standard. Elements of Fig. 6 corresponding to those of Fig. 2 are given reference numbers 100 higher. Whereas in Fig. 2 the data containing the packets is transmitted from the tranceiver 109 to the mobile device (an "offline" system"), in the embodiment of Fig. 6 (an "online" system) each mobile device 201 communicates with the server 213 via a

communication system which may be a standard telephone network or or wi-fi

communication network. That is, that aerial 209 in Fig. 6 represents the data transmission aerial of a telephone or wi-fi communication network, and the server 213 sends signals to the aerial 209 by sending messages to the control system (not shown) of that

communication network. The messages sent to the mobile device 201 preferably contain the time according to the reference clock which controls the display of video by the the display device 203, This allows a clock of the mobile device 201 to be synchronised with the reference clock. At any rate, when the user enters a command into the mobile device 20 , a determination is made (e.g. by mobile device 201 , or by the server 213 if the mobile device 201 generates a signal to the server 213 indicating that the command has been entered) of the time according to the reference clock when the command was entered. This information may be used to select from a database (e.g database 215) information relating to a product which was referenced in the video displayed by the screen 203 in an immediately preceding interval.

Note that in this embodiment, the mobile device 201 may contain no database at all of retail information and/or soundtracks. Any soundtracks may be streamed to the mobile device 201 from the database 2 5 via the server 213 using the telephone or wi-fi network.

Instead of the mobile device storing a database of retail information, upon the user issuing a command for retail information the mobile device 201 may generate a query signal which is sent over the telephone or wi-fi network to the server 213 which extracts the retail information from the database 215, and returns it to the mobile device 201 using the aerial 209.

Furthermore, the server 213 may periodically push adverts to the mobile device 201 relating to products shown on the display device 203. The adverts may be displayed by the screen of the mobile device. The user is given the option of reacting to the adverts by entering a command which causes the mobile device 201 to signal the server 213 to obtain further retail information from the database 215, or even a command which causes the mobile device 201 to signal the server 213 to commence a purchase of the product.

Claims

1. A method for delivering information to a user operating a mobile device, the method comprising: displaying a video to the user of the mobile device using at least one display screen which is not part of the mobile device, according to a timing determined by a reference clock; wirelessly transmitting to the mobile device radio frequency data indicating the time according to the reference clock; and the mobile device using the time according to the reference clock to obtain information from a database, and transmitting the obtained information to the user.

2. A method according to claim 1 in which the information relates to products

referenced in the video, the step of the mobile device obtaining information comprising: registering at the mobile device a command generated by the user to obtain further information; determining the time according to the reference clock when the command was generated; and according to the determined time, selecting data from a database which stores information relating to a plurality of products, the selected data relating to a product which was referenced in the video shown by the display screen during in an interval preceding the generation of the command.

3. A method according to claim 1 in which the information is a soundtrack

accompanying the video, the step of the mobile device obtaining information comprising, based on the time according to the reference clock, selecting audio data from a database; and the step of transmitting the information to the user comprising generating sound using the audio data and transmitting the sound to the user.

4. A method according to any of claims 1 to 3 in which the database is stored on the mobile device.

5. A method according to any of claims 1 to 4 in which the at least one display 'screen is a home display screen.

6. A method according to any of claims 1 to 4 in which the at least one display screen is a public display screen located so as to be visible to individuals in a public area.

7. A method according to claim 6 in which the display screen is a billboard.

8. A method according to any preceding claim in which the data transmitted to the mobile device is transmitted in packets on advertising channels of a wireless personal area network.

9. A method according to claim 8 in which the different data is transmitted on different ones of a plurality of the advertising channels, the mobile device being provided with circuitry to distinguish the data transmitted on the different advertising channels.

10. A method according to claim 9 in which a first said advertising channel and a second said advertising channel transmit data alternately.

1 1. A method according to claim 9 or claim 10 in which the advertising channels are channels as defined by the Bluetooth LE standard.

12. A method according to claim 11 in which time synchronisation data is transmitted on channel 37, and calibration data is transmitted on another advertising channel.

13. A method of transmitting data to a mobile device using a plurality of advertising channels of a wireless personal area network, the method comprising: transmitting first data to the mobile device using a first of the advertising channels; transmitting second data, which is different from the first data, to the mobile device using a second of the advertising channels; the mobile device containing circuitry for receiving signals transmitted on the first and second advertising channels, and extracting independent data signals representing the first and second data.

14. A method according to claim 13 in which a first said advertising channel and a second said advertising channel transmit data alternately.

15. A method according to claim 13 or claim 14 in which the advertising channels are channels as defined by the Bluetooth LE standard.

16. A method according to claim 5 in which time synchronisation data is transmitted on channel 37, and calibration data is transmitted on another advertising channel.

17. A method of obtaining information relating to a product to a user operating a mobile device, the method comprising: displaying a video to the user of the mobile device using at least one display screen which is not part of the mobile device, according to a timing determined by a reference clock; registering at the mobile device a command generated by the user to obtain further information; determining the time according to the reference clock when the command was generated; according to the determined time, selecting data from a database which stores information relating to a plurality of products, the selected data relating to a product which was referenced in the video shown by the display screen during in an interval preceding the generation of the command; and and transmitting the selected data to the user.

18. A system for delivering information to a user, the system comprising: a mobile device operated by the user; and a display system comprising: (a) at least one display screen which is not part of the mobile device and arranged to display a video to the user of the mobile device, according to a timing determined by a reference clock; and

(b) a transceiver for wirelessly transmitting to the mobile device radio frequency data indicating the time according to the reference clock; the mobile device being arranged to use the time according to the reference clock to obtain information from a database, and transmit the selected information to the user

19. A system according to claim 18 in which the database contains information relating to products referenced in the video, and the mobile device is arranged to:

(i) register a command generated by the user to obtain further information; (ii) determine the time according to the reference clock signal when the command was generated;

(iii) according to the determined time, obtain data selected from the database relates to a product which was referenced in the video shown by the display screen during in an interval preceding the generation of the command; and (iv) transmit the selected information to the user.

20. A system according to claim 18 in which the database contains a soundtrack for the video, and the mobile device is arranged to use the time according to the reference clock to select audio data from the database, generate sound using the audio data, and transmit the sound to the user.

21. A display system for use in a system according to any of claims 18 to 20, and comprising: at least one display screen; a transceiver; and a server for generating data for transmission by the transceiver.

22. A wireless personal area network system comprising: at least one transceiver from transmitting signals using a plurality of advertising channels; at least one server for generating signals for transmission by the transceiver; and at least one mobile device; the transceiver being arranged:

(i) to transmit first data to the mobile device using a first of the advertising channels;

(ii) to transmit second data to the mobile device, which is different from the first data, using a second of the advertising channels; the mobile device containing circuitry for receiving signals transmitted on the first and second advertising channels, and extracting independent data signals representing the first and second data.

23. A mobile device for use in the system of any of claims 18 to 20 or 22.