FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See section 10, rule 13)
1. Title of the Invention:
“A SYSTEM AND A METHOD FOR FACILITATING MESSAGING SERVICE”
2. APPLICANT (S) -
(a) Name : Zensar Technologies Limited
(b) Nationality : Indian
(c) Address : Plot# 4 Zensar Knowledge Park, MIDC, Kharadi,
Off Nagar Road, Pune, Maharashtra - 411014, India
The following specification particularly describes the invention and the manner in which it is to be performed.

TECHNICAL FIELD
The present disclosure relates in general to message delivery system. More particularly, but not exclusively, to a method and system for facilitating message delivery in an offline mode.
BACKGROUND
Various messaging systems/applications, for example FacebookTM messenger, WhatsAppTM are available for transmitting the messages from one device to another device. These messaging systems require connectivity with internet at both the ends for transmitting and receiving messages between the devices. However, without internet connectivity, transmitting the messages using these messaging applications becomes a challenge. Even if one end is connected to the internet, messaging applications may not be able to deliver the messages to the other end. The primary reason for such failure is requirement of a central server which acts as a gateway between both the devices connected with the internet.
Hence, letting the messaging applications work in an offline mode is a challenge on several technical aspects. One technical challenge is to establish a network between the devices which are in the offline mode. Establishing and managing such network becomes more complex when the number of offline devices increases.
SUMMARY
In one non-limiting embodiment of the present disclosure, a method for facilitating messaging service is disclosed. The method comprises providing a plurality of communication devices in an offline mode. Each of the plurality of communication devices is capable to operate in one or more communication modes and communicate with each other using at least one messaging application provided therewithin. The method further comprises capturing, at each communication device, one or more ping times taken for communicating with corresponding one or more adjacent communication devices of the plurality of communication devices. The one or more adjacent communication devices indicate corresponding communication devices present in a communication range. The method further comprises broadcasting, by each communication device, the one or more ping times captured to other communication devices present in the offline mode so that each of the plurality of communication devices learn about the one or more ping

times taken for communicating by the other communication devices to the corresponding one or more adjacent communication devices. Further, upon detecting an instance when a transmitting communication device desires to transmit a message to a receiving communication device of the plurality of communication devices within the offline mode, the method comprises determining a plurality of paths between the transmitting communication device and the receiving communication device based on the one or more communication times captured for each of the plurality of the communication devices. The plurality of paths determined has corresponding a plurality of path times associated therewith. Further, the method comprises determining hopping information for each of the plurality of paths. The hopping information comprises a count of intermediary communication devices appearing between the transmitting communication device and the receiving communication device. The method further comprises selecting a path amongst the plurality of paths based on at least one of a shortest path time and a least count of the intermediary communication devices in order to transmit the message from the transmitting communication device to the receiving communication device.
In another non-limiting embodiment of the present disclosure, a system for facilitating messaging service is disclosed. The system comprises a plurality of communication devices in an offline mode, wherein each of the plurality of communication devices is capable to operate in one or more communication modes and to communicate with each other using at least one messaging application provided therewithin. The communication device comprises a capturing unit to enable each communication device to capture one or more ping times taken for communicating with corresponding one or more adjacent communication devices of the plurality of communication devices. The one or more adjacent communication devices indicate the corresponding communication devices present in a communication range. The system further comprises a broadcasting unit to enable each communication device to broadcast the one or more ping times captured to other communication devices present in the offline mode so that each of the plurality of communication devices learn about the one or more ping times taken for communicating by the other communication devices to their respective one or more adjacent communication devices. The system further comprises a messaging unit which, upon detecting an instance when a transmitting communication device desires to transmit a message to a receiving communication device of the plurality of communication devices within the offline mode, determines a plurality of paths

between the transmitting communication device and the receiving communication device based on the one or more communication times captured for each of the plurality of the communication devices. The plurality of paths determined has corresponding a plurality of path times associated therewith. The messaging unit further determines hopping information for each of the plurality of paths. The hopping information comprises a count of intermediary communication devices appearing between the transmitting communication device and the receiving communication device. Further, the messaging unit selects a path amongst the plurality of paths based on at least one of a shortest path time and a least count of the intermediary communication devices in order to transmit the message from the transmitting communication device to the receiving communication device.
The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate exemplary embodiments and, together with the description, serve to explain the disclosed principles. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system and/or methods in accordance with embodiments of the present subject matter are now described, by way of example only, and with reference to the accompanying figures, in which:
FIG. 1 shows an exemplary environment 100 illustrating a system for facilitating messaging service, in accordance with some embodiments of the present disclosure;
FIG. 2 shows a detailed block 200 diagram of a system implemented in a communication device for facilitating messaging service, in accordance with some embodiments of the present disclosure;

FIG. 3 shows a flowchart 300 illustrating a method for facilitating messaging service, in accordance with some embodiments of the present disclosure; and
FIG. 4 illustrates a block diagram of an exemplary computer system for implementing embodiments consistent with the present disclosure
It should be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative systems embodying the principles of the present subject matter. Similarly, it will be appreciated that any flow charts, flow diagrams, and the like represent various processes which may be substantially represented in computer readable medium and executed by a computer or processor, whether or not such computer or processor is explicitly shown.
DETAILED DESCRIPTION
In the present document, the word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment or implementation of the present subject matter described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
While the disclosure is susceptible to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the drawings and will be described in detail below. It should be understood, however that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the spirit and the scope of the disclosure.
The terms “comprises”, “comprising”, “includes”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, device, apparatus, system or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or device or apparatus or system or method. In other words, one or more elements in a system or apparatus or device proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or method.

The present disclosure relates to a method and a system for facilitating messaging service between communication devices when no internet connection is available between the transmitting and receiving communication devices. According to embodiments, the communication devices may be present in an office building, home or may be present in any premises, in which, the communication devices may be discovered through different communication instances (Bluetooth, Zigbee etc.,) and do not require internet connectivity. Now a days, many messaging systems/applications which we use like FacebookTM messenger, SnapchatTM, TelegramTM, WhatsAppTM and the like requires internet connection. Hence, it becomes a challenge to use such messaging systems in no or intermittent internet connectivity.
The present disclosure addresses this issue by enabling communication devices to communicate with each other in an offline mode. According to an embodiment, the communication devices may include, but not limited to, mobile phones, computer, laptops, PDA’s or any computing device capable of running the messaging applications. For providing the communication in the offline mode, the present disclosure uses various communication instances which include, but not limited to, Bluetooth, Zigbee, light fidelity (Li-Fi), and Wireless fidelity (Wi-Fi). These communication instances may be used by a communication device to ping another communication device. Accordingly, ping times may be determined from each one communication device to other adjacent communication devices present in the offline mode. It may be understood to a skilled person that ping time may be measured in milliseconds and may indicate round trip time for data packet to reach host and for response to return to the transmitter .
The ping times determined may be broadcasted from each communication device to other communication devices present in the offline mode. The purpose of such broadcasting is to help all the communication device know or learn about the ping times of other communication device. The technical advantage achieved with the broadcasting is that the communication device, not directly connected with another communication device due to no network connectivity or any other issue, may still be able to know about the ping times of the other communication device.
Knowing the ping times further helps in achieving a technical objective of finding an optimal path or route, between two communication devices, for transmitting the messages. Suppose a user wants to transmit a message from his/her communication device to another

communicating device, multiple paths may be discovered with their corresponding path times. Along with the paths and their path times, hopping information may also be determined. The hopping information may include a count of intermediary communication devices between transmitting and receiving communication devices.
The hopping information may be used when two or more paths are discovered with same path times. Hence, in such case, the path having least count of the intermediary communication devices may be selected for transmitting the message. Once the path is selected, the communication instance is also selected between the transmitting and receiving communication devices based on characteristics (size, type) of the message to be transmitted. This way, the present disclosure enables the communication devices to efficiently communication with each in the offline mode.
In the following detailed description of the embodiments of the disclosure, reference is made to the accompanying drawings that form a part hereof, and in which are shown by way of illustration specific embodiments in which the disclosure may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the disclosure, and it is to be understood that other embodiments may be utilized and that changes may be made without departing from the scope of the present disclosure. The following description is, therefore, not to be taken in a limiting sense.
FIG. 1 shows an exemplary environment 100 illustrating a system for facilitating messaging service, in accordance with some embodiments of the present disclosure.
The environment 100 comprises a plurality of communication devices 102 in an offline mode. According to an embodiment of present disclosure, the plurality of communication devices 102 may be present within premises like offices, shopping malls, house and may wish to communicate with each other. It may be understood to a skilled person that, the plurality of communication devices 102 may be provided with internet enabled messaging applications through which users, of the plurality of communication devices 102, may communicate with each other. These messaging applications may be for example, FacebookTM messenger, SnapchatTM, TelegramTM, WhatsAppTM and the like.

As this messaging applications require internet connection, it becomes a challenge to use them without internet or in the offline mode. The present disclosure addresses this challenge by enabling the communication devices 102 to facilitate the messaging service while being in the offline mode. In the figure 1, there are 9 communication devices 102 are shown i.e., A, B, C, D, E, F, G, H, and I. It may be understood to the skilled person that, the arrangement and number of the communication devices 102 shown in figure 1 is just an example, and hence the scope of the present disclosure is not limited by this arrangement. Further, the plurality of communication devices 102 are capable to operate in one or more communication instances (Bluetooth or ZigBee) as described in above paragraphs of the specification.
Now, figure 1 is explained in conjunction with figure 2 to describe how the system 200 is implemented among the communication devices 102 for facilitating messaging service in intermittent or no network connectivity. According to an embodiment of present disclosure, each of the plurality of the communication devices 102 in the offline mode may comprise input/output interface 202, a processor 204, a memory 206, and units 210. The I/O interface 202 may include a variety of software and hardware interfaces, for example, a web interface, a graphical user interface, input device, output device and the like. The I/O interface 202 may allow the communication device 102 to interact with the user directly or through other devices. The memory 206 is communicatively coupled to the processor 204. Further, the memory 206 comprises of ping time 212, unique ids 212 and other data 214. Further, the units 210 comprises a capturing unit 218, a broadcasting unit 220, a messaging unit 222, and other units 224.
According to an embodiment of present disclosure, the system 200 may be understood as a network of the plurality of communication devices 102 present within the premises. In the example shown in figure 1, a user having the communication device A 102 wishes to transmit a message to another user having a communication device C 102. Hence, the “A” is the transmitting communication device 102 and “C” is the receiving communication device 102. As can be seen from figure 1 that A and C are not directly connected with each other, and hence may require a path for transmitting the message. The technical challenge is how the communication device A 102 would know which path is optimal one for transmitting the message to communication device C 102.

To address this technical challenge, the present disclosure makes each of the communication devices 102 learn about the connectivity with other communication devices 102. In other words, the present disclosure implements a blockchain technology so that each of the communication devices 102 get updated about the status of the other communication devices 102 present in the offline mode.
For this, the capturing unit 218 may enable each communication device 102 to capture one or more ping times 212 taken for communicating with corresponding one or more adjacent communication devices 102 of the plurality of communication devices 102. The one or more adjacent communication devices 102 are those communication devices which are in a communication range. According to the example shown in figure 1, the capturing unit 218 captures the ping times 212 for its adjacent communication devices B, D and F. Similarly, the capturing unit 218 captures the ping times 212 for all the communication devices 102.
Once the ping times 212 are captured and stored in the memory 206, in next step, the broadcasting unit 220 enables each communication device 102 to broadcast the ping times 212 to other communication devices 102 present in the offline mode. Thus, the broadcasting enables each of the plurality of communication devices 102 learn about the ping times 212 taken for communicating by the other communication devices 102 to their respective one or more adjacent communication devices 102. According to the example shown in figure 1, though the communication device A is not directly connected with the communication device I, still A and I knows about the ping times 212 of each other. This knowledge or awareness enable the communication devices 102 in finding the optimal path for transmitting the messages while using the messaging applications/platforms installed therewith.
Now, referring back the present example, in which, the user of the communication device A wishes to transmit the message to the user of the communication device C. The first step for transmitting the message would be to discover presence of the receiving communication device C by the transmitting communication device A present in the offline mode. For discovering, the transmitting communication device A broadcasts a unique ID 214 of the receiving communication device C in the offline mode. It may be understood to the skilled person that the unique ID 214

may be identifier associated with each of the communication device 102 present in the offline mode. For example, the unique Id 214 may be an encrypted number assisting to peer communication devices, present in the premises, in identifying the transmitting communication device 102. Once the unique ID 214 of the receiving communication device C is broadcasted, the transmitting communication device A receives the broadcasting response, which is the presence signal provided by the receiving communication device C. This helps the transmitting communication device A to determine that the receiving communication device C is present in the offline mode, and therefore the optimal path need to be identified.
Hence, in the next step, the messaging unit 222 determines a plurality of paths between the transmitting communication device A and the receiving communication device C based on the one or more ping times 212 captured for each of the plurality of the communication devices 102. In the present example shown in figure 1, the plurality of paths between A and C comprises Path 1, Path 2, and Path 3. It can be also observed that the plurality of paths determined has corresponding plurality of path times associated therewith. For example, the Path 1 (A>B>C) has a path time of 3 milliseconds (ms). Whereas, Path 2 (A>D>E>C) and Path 3 (A>F>G>H>I>C) has path times 3 ms and 5.5 ms respectively.
However, selecting the path only based on the path times may be useful if the path times of the identified paths are different. In that case, it could be easy to select the path having the shortest path time. However, in case the path times are same for the identified paths, it becomes a challenge to select the optimal path. In the present example only, the path times for Path 1 and Path 2 are same i.e., 3 ms. Hence, it becomes the challenge to select one of them.
For this, the messaging unit 222 may also determine hopping information for each of the plurality of paths determined between the transmitting communication device A and the receiving communication device C. According to embodiments of present disclosure, the hopping information may comprise a count of intermediary communication devices appearing between the transmitting communication device A and the receiving communication device C.

According to the example shown in the figure 1, the count of intermediary communication device for Path 1 is “one” and for Path 2 is “two”. That is, in the Path 1, B is the intermediary communication device 102 between A and C. Whereas, in Path 2, D and E are the intermediary communication devices 102 between A and C. Hence, in this case, the messaging unit 222 selects a path, amongst the plurality of paths, having a shortest path time and a least count of the intermediary communication devices to transmit the message from the transmitting communication device A to the receiving communication device C. In this case, Path 1 is selected because it has the shortest path time of 3 ms and has only one intermediary communication device 102 i.e., B. However, according to another embodiment of present disclosure, it may also happen that two or more paths may have same path time and same number of intermediary communication devices 102. In such scenario, the path discovered by the transmitting communication device A earlier may be given the priority. However, it may be understood to the skilled person that the above given example shown in figure 1 is just an example and shall not limit the scope of the present disclosure.
Now, once the path is selected, the next task is to efficiently transmit the message from the transmitting communication device A to the receiving communication device C. Thus, the messaging unit 222 is further configured to select a communication interface, amongst the one or more communication interfaces, for the transmitting communication device A and for each intermediary communication device associated with the path selected between the transmitting communication device A and the receiving communication device C. For this, messaging unit 222 may identify a message type associated with the message to be transmitted . For example, the message type may comprise at least one of a text message, an audio message, a video message, a multimedia message, or a combination thereof. Post identifying the message type, the messaging unit 222 now determines a network load associated with the message based on the message type. It may be understood to the skilled person that the network load indicates amount of network data required for transmitting the message from one communication device 102 to another communication device 102. Now, another factor is the distance between the communication devices 102. That is, the messaging unit 222 determines a distance between each of two consecutive communication devices of the path selected.

Considering the message to be transmitted is a text message “Hi, How are you?” which may require comparatively less network data, for example 200 kilobyte (kb). Now, since the distance between A and B is more compare to B and C, the messaging unit 222 may select “Zigbee” as the communication interface for transmitting the message from A to B, whereas selects “Bluetooth” for transmitting the message from B to C. This way, the message is transmitted from the transmitting communication device A to receiving communication device C.
According to other embodiments of present disclosure, the synchronization is performed, for the changes happened during the offline mode, between the communication devices 102 and the messaging application server 104. For this, the messaging unit 222 detect at least one communication device 102, of the plurality of communication devices 102 within the offline mode, switching from the offline mode to an online mode. Upon detecting, the messaging unit 222 enables the communication device 102 detected to be in the online mode for synchronizing messaging application server 104 about the message transmitted and received by the transmitting communication device A and the receiving communication device C respectively. Suppose the internet connection arrives in one of the communication device 102 (Communication device G as shown in figure 1), then the G may synchronize the messaging application server 104 with the changes happened during the offline mode.
FIG. 3 shows a flowchart 300 illustrating a method for facilitating messaging service, in accordance with some embodiments of the present disclosure.
As illustrated in figure 3, the method 300 includes one or more blocks illustrating a method to facilitate the messaging service. The method 300 may be described in the general context of computer executable instructions. Generally, computer executable instructions can include routines, programs, objects, components, data structures, procedures, modules, and functions, which perform specific functions or implement specific abstract data types.
The order in which the method 300 is described is not intended to be construed as a limitation, and any number of the described method blocks can be combined in any order to implement the method. Additionally, individual blocks may be deleted from the methods without

departing from the spirit and scope of the subject matter described herein. Furthermore, the method can be implemented in any suitable hardware, software, firmware, or combination thereof.
At block 302, a plurality of communication devices 102 in an offline mode is provided. Each of the plurality of communication devices 102 is capable to operate in one or more communication interfaces and to communicate with each other using at least one internet enabled messaging application provided therewithin.
At block 304, the capturing unit 218 may enable each communication device 102 to capture one or more ping times 212 taken for communicating with corresponding one or more adjacent communication devices 102 of the plurality of communication devices 102. The one or more adjacent communication devices indicate corresponding communication devices present in a communication range.
At block 306, the broadcasting unit 220 may enable each communication device 102 to broadcast the one or more ping times 212 captured to other communication devices 102 present in the offline mode so that each of the plurality of communication devices 102 learn about the one or more ping times 212 taken for communicating by the other communication devices 102 to the corresponding one or more adjacent communication devices 102.
At block 308, the messaging unit 222 may detect an instance when a transmitting communication device 102 desires to transmit a message to a receiving communication device 102 of the plurality of communication devices 102 within the offline mode.
At block 310, if the message transmitting instance is detected, the messaging unit 222 may determine a plurality of paths between the transmitting communication device and the receiving communication device based on the one or more ping times captured for each of the plurality of the communication devices. The plurality of paths determined has corresponding a plurality of path times associated therewith.

At block 312, the messaging unit 222 may determine hopping information for each of the plurality of paths. The hopping information comprises a count of intermediary communication devices appearing between the transmitting communication device and the receiving communication device.
At block 314, the messaging unit 222 may select a path amongst the plurality of paths based on at least one of a shortest path time and a least count of the intermediary communication devices to transmit the message from the transmitting communication device to the receiving communication device.
Computer System
Fig.4 illustrates a block diagram of an exemplary computer system 400 for implementing embodiments consistent with the present invention. In an embodiment, the computer system 400 can be the communication device 102 which is used for facilitating messaging service in the offline mode. According to an embodiment, the computer system 400 may receive ping times 410 from other communication devices 102 present in the offline mode. The computer system 400 may comprise a central processing unit (“CPU” or “processor”) 402. The processor 402 may comprise at least one data processor for executing program components for executing user- or system-generated business processes. The processor 402 may include specialized processing units such as integrated system (bus) controllers, memory management control units, floating point units, graphics processing units, digital signal processing units, etc.
The processor 402 may be disposed in communication with one or more input/output (I/O) devices (411 and 412) via I/O interface 401. The I/O interface 401 may employ communication protocols/methods such as, without limitation, audio, analog, digital, stereo, IEEE-1394, serial bus, Universal Serial Bus (USB), infrared, PS/2, BNC, coaxial, component, composite, Digital Visual Interface (DVI), high-definition multimedia interface (HDMI), Radio Frequency (RF) antennas, S-Video, Video Graphics Array (VGA), IEEE 802.n /b/g/n/x, Bluetooth, cellular (e.g., Code-Division Multiple Access (CDMA), High-Speed Packet Access (HSPA+), Global System For Mobile Communications (GSM), Long-Term Evolution (LTE) or the like), etc.
Using the I/O interface 401, the computer system 400 may communicate with one or more I/O devices (411 and 412).

In some embodiments, the processor 402 may be disposed in communication with a communication network 409 via a network interface 403. The network interface 403 may communicate with the communication network 409. The network interface 403 may employ connection protocols including, without limitation, direct connect, Ethernet (e.g., twisted pair 10/100/1000 Base T), Transmission Control Protocol/Internet Protocol (TCP/IP), token ring, IEEE 802.11a/b/g/n/x, etc. The communication network 409 can be implemented as one of the different types of networks, such as intranet or Local Area Network (LAN) and such within the organization. The communication network 409 may either be a dedicated network or a shared network, which represents an association of the different types of networks that use a variety of protocols, for example, Hypertext Transfer Protocol (HTTP), Transmission Control Protocol/Internet Protocol (TCP/IP), Wireless Application Protocol (WAP), etc., to communicate with each other. Further, the communication network 409 may include a variety of network devices, including routers, bridges, servers, computing devices, storage devices, etc.
In some embodiments, the processor 402 may be disposed in communication with a memory 405 (e.g., RAM 413, ROM 414, etc. as shown in FIG. 4) via a storage interface 404. The storage interface 404 may connect to memory 405 including, without limitation, memory drives, removable disc drives, etc., employing connection protocols such as Serial Advanced Technology Attachment (SATA), Integrated Drive Electronics (IDE), IEEE-1394, Universal Serial Bus (USB), fiber channel, Small Computer Systems Interface (SCSI), etc. The memory drives may further include a drum, magnetic disc drive, magneto-optical drive, optical drive, Redundant Array of Independent Discs (RAID), solid-state memory devices, solid-state drives, etc.
The memory 405 may store a collection of program or database components, including, without limitation, user/application data 406, an operating system 407, web browser 408 etc. In some embodiments, the computer system 400 may store user/application data 406, such as the data, variables, records, etc. as described in this invention. Such databases may be implemented as fault-tolerant, relational, scalable, secure databases such as Oracle or Sybase.
The operating system 407 may facilitate resource management and operation of the computer system 400. Examples of operating systems include, without limitation, Apple Macintosh OS X, UNIX, Unix-like system distributions (e.g., Berkeley Software Distribution (BSD), FreeBSD, Net BSD, Open BSD, etc.), Linux distributions (e.g., Red Hat, Ubuntu, K-

Ubuntu, etc.), International Business Machines (IBM) OS/2, Microsoft Windows (XP, Vista/7/8, etc.), Apple iOS, Google Android, Blackberry Operating System (OS), or the like. I/O interface 401 may facilitate display, execution, interaction, manipulation, or operation of program components through textual or graphical facilities. For example, I/O interface may provide computer interaction interface elements on a display system operatively connected to the computer system 400, such as cursors, icons, check boxes, menus, windows, widgets, etc. Graphical User Interfaces (GUIs) may be employed, including, without limitation, Apple Macintosh operating systems’ Aqua, IBM OS/2, Microsoft Windows (e.g., Aero, Metro, etc.), Unix X-Windows, web interface libraries (e.g., ActiveX, Java, JavaScript, AJAX, HTML, Adobe Flash, etc.), or the like.
In some embodiments, the computer system 400 may implement a web browser 408 stored program component. The web browser 408 may be a hypertext viewing application, such as Microsoft™ Internet Explorer, Google™ Chrome, Mozilla™ Firefox, Apple™ Safari™, etc. Secure web browsing may be provided using Secure Hypertext Transport Protocol (HTTPS) secure sockets layer (SSL), Transport Layer Security (TLS), etc. Web browsers may utilize facilities such as AJAX, DHTML, Adobe Flash, JavaScript, Java, Application Programming Interfaces (APIs), etc. In some embodiments, the computer system 400 may implement a mail server stored program component. The mail server 416 may be an Internet mail server such as Microsoft Exchange, or the like. The mail server 416 may utilize facilities such as Active Server Pages (ASP), ActiveX, American National Standards Institute (ANSI) C++/C#, Microsoft .NET, CGI scripts, Java, JavaScript, PERL, PHP, Python, WebObjects, etc. The mail server may utilize communication protocols such as Internet Message Access Protocol (IMAP), Messaging Application Programming Interface (MAPI), Microsoft Exchange, Post Office Protocol (POP), Simple Mail Transfer Protocol (SMTP), or the like. In some embodiments, the computer system 400 may implement a mail client 415 stored program component. The mail client 415 may be a mail viewing application, such as Apple™ Mail, Microsoft™ Entourage, Microsoft™ Outlook, Mozilla™ Thunderbird, etc.
Furthermore, one or more computer-readable storage media may be utilized in implementing embodiments consistent with the present invention. A computer-readable storage medium refers to any type of physical memory on which information or data readable by a processor may be stored. Thus, a computer-readable storage medium may store instructions for

execution by one or more processors, including instructions for causing the processor(s) to perform steps or stages consistent with the embodiments described herein. The term “computer-readable medium” should be understood to include tangible items and exclude carrier waves and transient signals, i.e., non-transitory. Examples include Random Access Memory (RAM), Read-Only Memory (ROM), volatile memory, nonvolatile memory, hard drives, Compact Disc (CD) ROMs, Digital Video Disc (DVDs), flash drives, disks, and any other known physical storage media
Advantages of the embodiment of the present disclosure are illustrated herein
In an embodiment, the present disclosure provides a method for transmitting messages from a transmitting communication device to receiving communication device in an offline mode.
In an embodiment, the method of present disclosure optimizes the power consumed by the communication devices by efficiently selecting an appropriate communication instances based on characteristics of the message to be transmit.
The terms "an embodiment", "embodiment", "embodiments", "the embodiment", "the embodiments", "one or more embodiments", "some embodiments", and "one embodiment" mean "one or more (but not all) embodiments of the invention(s)" unless expressly specified otherwise.
The terms "including", "comprising", “having” and variations thereof mean "including but not limited to", unless expressly specified otherwise.
The enumerated listing of items does not imply that any or all of the items are mutually exclusive, unless expressly specified otherwise.
The terms "a", "an" and "the" mean "one or more", unless expressly specified otherwise.
A description of an embodiment with several components in communication with each other does not imply that all such components are required. On the contrary, a variety of optional components are described to illustrate the wide variety of possible embodiments of the invention.
When a single device or article is described herein, it will be readily apparent that more than one device/article (whether or not they cooperate) may be used in place of a single

device/article. Similarly, where more than one device or article is described herein (whether or not they cooperate), it will be readily apparent that a single device/article may be used in place of the more than one device or article or a different number of devices/articles may be used instead of the shown number of devices or programs. The functionality and/or the features of a device may be alternatively embodied by one or more other devices which are not explicitly described as having such functionality/features. Thus, other embodiments of the invention need not include the device itself.
Finally, the language used in the specification has been principally selected for readability and instructional purposes, and it may not have been selected to delineate or circumscribe the inventive subject matter. It is therefore intended that the scope of the invention be limited not by this detailed description, but rather by any claims that issue on an application based here on. Accordingly, the embodiments of the present invention are intended to be illustrative, but not limiting, of the scope of the invention, which is set forth in the following claims.
While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

Referral Numerals:

Reference Number Description
100 ENVIRONMENT
102 COMMUNICATION DEVICE
104 MESSAGING APPLICATION SERVER
202 I/O INTERFACE
204 PROCESSOR
206 MEMORY
208 DATA
210 UNITS
212 PING TIMES
214 UNIQUE IDS
216 OTHER DATA
218 CAPTRUING UNIT
220 BROADCASTING UNIT
222 MESSAGING UNIT
224 OTHER UNITS
400 EXEMPLARY COMPUTER SYSTEM
401 I/O INTERFACE OF THE EXEMPLARY COMPUTER SYSTEM
402 PROCESSOR OF THE EXEMPLARY COMPUTER SYSTEM
403 NETWORK INTERFACE
404 STORAGE INTERFACE
405 MEMORY OF THE EXEMPLARY COMPUTER SYSTEM
406 USER/APPLICATION
407 OPERATING SYSTEM
408 WEB BROWSER
409 COMMUNICATION NETWORK
410 PING TIMES
411 INPUT DEVICES

412 OUTPUT DEVICES
413 RAM
414 ROM
415 MAIL CLIENT
416 MAIL SERVER
417 WEB SERVER

We claim:
1. A method for facilitating messaging service, the method comprising:
providing a plurality of communication devices (102) in an offline mode, wherein each of the plurality of communication devices (102) is capable to operate in one or more communication interfaces and to communicate with each other using at least one internet enabled messaging application provided therewithin;
capturing, by a capturing unit (218), at each communication device (102), one or more ping times (212) taken for communicating with corresponding one or more adjacent communication devices (102) of the plurality of communication devices (102), wherein the one or more adjacent communication devices (102) indicate corresponding communication devices present in a communication range;
broadcasting, by a broadcasting unit (220) of each communication device (102), the one or more ping times (212) captured to other communication devices (102) present in the offline mode so that each of the plurality of communication devices (102) learn about the one or more ping times (212) taken for communicating by the other communication devices (102) to the corresponding one or more adjacent communication devices (102);
performing, by a messaging unit (222), upon detecting an instance when a transmitting communication device (102) desires to transmit a message to a receiving communication device (102) of the plurality of communication devices (102) within the offline mode:
determining a plurality of paths between the transmitting communication device (102) and the receiving communication device (102) based on the one or more ping times (212) captured for each of the plurality of the communication devices (102), wherein the plurality of paths determined has corresponding a plurality of path times associated therewith;
determining hopping information for each of the plurality of paths, wherein the hopping information comprises a count of intermediary communication devices (102) appearing between the transmitting communication device (102) and the receiving communication device (102); and
selecting a path amongst the plurality of paths based on at least one of a shortest path time and a least count of the intermediary communication devices (102) in order to

transmit the message from the transmitting communication device (102) to the receiving communication device (102).
2. The method as claimed in claim 1, further comprising selecting a communication interface,
amongst the one or more communication interfaces, for the transmitting communication device
(102) and for each intermediary communication device (102) associated with the path selected
between the transmitting communication device (102) and the receiving communication device
(102) by:
identifying a message type associated with the message, wherein the message type comprises at least one of a text message, an audio message, a video message, a multimedia message, or a combination thereof;
determining a network load associated with the message based on the message type, wherein the network load indicates amount of network data required for transmitting the message from one communication device (102) to another communication device (102); and
determining a distance between each of two consecutive communication devices (102) of the path selected, wherein the communication interfaces is selected based on the network load associated with the message and the distance.
3. The method as claimed in claim 1, wherein the one or more communication interfaces comprising at least one of a Wi-Fi mode, a Li-Fi mode, a Bluetooth mode, and a zig-bee mode.
4. The method as claimed in claim 1, further comprising discovering, by the transmitting communication device (102), presence of the receiving communication device (102) in the offline mode by:
broadcasting a unique identifier (214) associated with the receiving communication device (102) to the plurality of communication devices (102); and
receiving a broadcasting response, based on the broadcasting, from the receiving communication device (102);
5. The method as claimed in claim 1, further comprising:

detecting at least one communication device (102), of the plurality of communication devices (102) within the offline mode, switching from offline mode to an online mode; and
enabling the at least one communication device (102) detected to be in the online mode for synchronizing messaging application server (104) about the message sent and received by the transmitting communication device (102) and the receiving communication device (102).
6. A system for facilitating messaging service, the system comprises:
a plurality of communication devices (102) in an offline mode, wherein each of the plurality of communication devices (102) is capable to operate in one or more communication interfaces and to communicate with each other using at least one internet enabled messaging application provided therewithin,
and wherein each of the plurality of communication devices (102) comprises:
a capturing unit (218) to enable each communication device to capture one or more ping times (212) taken for communicating with corresponding one or more adjacent communication devices (102) of the plurality of communication devices (102), wherein the one or more adjacent communication devices (102) indicate corresponding communication devices (102) present in a communication range;
a broadcasting unit (220) to enable each communication device (102) to broadcast the one or more ping times (212) captured to other communication devices (102) present in the offline mode so that each of the plurality of communication devices (102) learn about the one or more ping times (212) taken for communicating by the other communication devices (102) to the corresponding one or more adjacent communication devices (102);
a messaging unit (222), upon detecting an instance when a transmitting communication device (102) desires to transmit a message to a receiving communication device (102) of the plurality of communication devices (102) within the offline mode, is configured to:
determine a plurality of paths between the transmitting communication
device (102) and the receiving communication device (102) based on the one or
more ping times (212) captured for each of the plurality of the communication
devices (102), wherein the plurality of paths determined has corresponding a
plurality of path times associated therewith;

determine hopping information for each of the plurality of paths, wherein the hopping information comprises a count of intermediary communication devices (102) appearing between the transmitting communication device (102) and the receiving communication device (102); and
select a path amongst the plurality of paths based on at least one of a shortest path time and a least count of the intermediary communication devices (102) to transmit the message from the transmitting communication device (102) to the receiving communication device (102).
7. The system as claimed in claim 6, wherein the messaging unit (222) is further configured
to select a communication interface, amongst the one or more communication interfaces, for the
transmitting communication device (102) and for each intermediary communication device (102)
associated with the path selected between the transmitting communication device (102) and the
receiving communication device (102) by:
identifying a message type associated with the message, wherein the message type comprises at least one of a text message, an audio message, a video message, a multimedia message, or a combination thereof;
determining a network load associated with the message based on the message type, wherein the network load indicates amount of network data required for transmitting the message from one communication device (102) to another communication device (102); and
determining a distance between each of two consecutive communication devices (102) of the path selected, wherein the communication interface is selected based on the network load associated with the message and the distance.
8. The system as claimed in claim 6, wherein the one or more communication interfaces comprising at least one of a Wi-Fi mode, a Li-Fi mode, a Bluetooth mode, and a zig-bee mode.
9. The system as claimed in claim 6 is further configured to enable the transmitting communication device (102) to discover presence of the receiving communication device (102) in the offline mode by:

broadcasting a unique identifier (214) associated with the receiving communication device (102) to the plurality of communication devices (102); and
receiving a broadcasting response, based on the broadcasting, from the receiving communication device (102).
10. The system as claimed in claim 6, wherein the messaging unit (222) is further configured
to:
detect at least one communication device (102), of the plurality of communication devices (102) within the offline mode, switching from offline mode to an online mode; and
enable the at least one communication device (102) detected to be in the online mode for synchronizing messaging application server (104) about the message sent and received by the transmitting communication device (102) and the receiving communication device (102).