FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
The patent Rule, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
“A METHOD FOR BATTERY SAVING OF A COMMUNICATING DEVICE AND THE COMMUNICATING DEVICE THEREOF”
MINDA CORPORATION LIMITED of E-5/2, Chakan Industrial Area, Phase- III M.I.D.C. Nanekarwadi, Tal: Khed, Dist., Pune, Maharashtra, 410-501, India
The following specification particularly describes the invention and the manner in which it is to be performed.

FIELD OF THE PRSENT INVENTION
[001] The present disclosure relates generally to a communicating device and method for battery saving of the communicating device (also referred to as electronic key/key fob/smart key throughout the disclosure). Particularly, but not exclusively, the present disclosure relates to a method for improving the battery life of the communicating device for a vehicle used in the passive entry passive start (PEPS) system.
BACKGROUND OF THE PRESENT INVENTION
[002] Vehicles of modern times embed complex electronic systems to improve driver safety and convenience. Areas of significant public and manufacturer interest include access to the vehicle (i.e., entry in the vehicle) and authorization to drive (i.e., start the vehicle). Traditionally, access and authorization has been achieved using physical key and lock systems, whereby inserting a correct key into the door and ignition locks, the user was able to enter and drive the vehicle. In the last decade, this system has been augmented with remote access in which users are able to open their vehicle remotely by pressing a button/key on their key fobs. In these systems, the authorization to drive was still mainly enforced by a physical key and lock system.
[003] In the next technological transformation and upgradation over the earlier authorization system, Passive Keyless Entry and Start (PKES) system is introduced as the means for increased user convenience and safety. The number of vehicles equipped with a Passive Keyless Entry and Start (PKES) systems, also termed as; smart key system continues to increase user convenience of the vehicle access system. Earlier the smart key systems were deployed for only four wheelers and multi-wheelers (passenger and commercial vehicles), however with the advent of high-end power bikes, safety concerns for these heavy and expensive two-wheeler alternatives is on the rise. At the same time, user convenience also demanded the smart key systems to be introduced for two wheelers as well. So, the keyless access authentication system finds its extensive use in the two-wheeler segment as well.

[004] Remote keyless entry (RKE) and Passive keyless entry (PKE) or Passive entry passive start (PEPS) systems are vehicle access technologies available to the vehicle users for many years. PEPS systems generally refer to permitting the entry of user into the vehicle without using the conventional electronic key plugging into the keyhole, as observed in Remote Keyless Entry system. This system also controls the operation of the vehicle without using the conventional electronic key. Passive entry device sends the wireless signals to initiate the keyless activities.
[005] A PKES system (smart key system) allows the driver to enter and start a vehicle without using a mechanical key through a wireless authentication process between the vehicle and the key fob. In general, these systems are used to lock, unlock, or start the vehicle according to the proximity of the key without user interactions. Using this system, the driver can control the door, trunk, and alarm (in case of four-wheelers) by pressing the button on the fob from a stipulated distance. The driver is allowed to enter and start the vehicle through the process of authentication with fobs registered in the vehicle or allows the driver to control door, trunk, and alarm by pressing the button on the fob from a distance in case of four wheelers. These systems when used in two wheelers, allows the access of the vehicle by unlocking it and also permits to start it by short press of a button, in the presence of a key fob within the limited vicinity of the vehicle. These systems provide safety and convenience for a user entering or exiting a vehicle. Some of the typical features offered by these systems allow the user to locate the vehicle and also to lock/unlock vehicle entry in a remote manner.
[006] The vehicle location could be assessed by pressing a vehicle finder button on the RKE/PEPS key fob. Typical RKE systems utilize a communicating device with a Radio Frequency (RF) transmitter which transmits to a base station in the vehicle. When the user is within range, the user actuates a corresponding button on the communicating device to send a vehicle finder command, lock or unlock command, for example.
[007] For keyless entry/vehicle detection systems the "vehicle finder" command particularly needs to support a long-distance range of operation. A typical vehicle finder application relies on the sending the RF signal from the key fob to the ECU of the vehicle. To

achieve the desirable range in a single button press, more than one (e.g. three) RF frames are sent in a single button press. More than one frame is sent from the Key fob to the ECU with the intention that the desired range is perceived from the frame having the minimum power level. Due to disparities such as noise and other non-predictable discrepancies of the transmission medium, this frame having minimal power could not be able to achieve the desired range.
[008] The issue of range improvement is detrimentally faced by the vehicle access technology suppliers, across the automotive domain. The range is severely impacted by the noise, omnipresent across the vehicle. Once the noise impacts the signal from the communication device, the vehicle finder operation may fail, prompting the user to repeatedly press key fob buttons for tracing the location of the vehicle, thus causing the user inconvenience. At the same time, in order to increase the range of the RF signal used in the vehicle finder application, each RF frame needs to be endowed with sufficient power to cross the threshold limit of the prescribed range.
[009] In existing prior arts, the RF power level transmitted at the transmitter end for all the three frames is kept at the same power level. This uniform power distribution across all the frames creates a positive impact on enhancing the range, however it also triggers significant consumption of the vehicle battery.
[010] Therefore, there is a need of art to build an improved, cost-effective solution for battery saving of a communicating device, also referred to as an electronic key fob which overcomes all the above-mentioned difficulties or drawbacks of disadvantages of prior arts mentioned above.
SUMMARY OF THE PRESENT INVENTION
[011] The present disclosure overcomes one or more shortcomings of the prior art and provides additional advantages discussed throughout the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other

embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
[012] In one non-limiting embodiment of the present disclosure, a method for saving
battery life of a communicating device is disclosed. The method comprises generating, by a communicating device, a first RF command signal of a first predetermined power level upon first time pressing a key of the communicating device and transmitting, by the communicating device, the first RF command signal to an Electronic Control Unit (ECU) of the vehicle. The method further discloses that the first RF command signal comprising a first plurality of RF frames, characterized in that a power level of each of the first plurality of RF frames varies among each other, and wherein power level of each of the first plurality of frames is more than the power level corresponding to a minimum allowed coverage range between the communicating device and the ECU of the vehicle.
[013] In another non-limiting embodiment of the present disclosure, wherein the power
level of each of the first plurality of RF frames varies among each other based on any one of the multiple curve equations that includes but not limited to an exponential, a sawtooth, a triangular, a gaussian inverse square, a parabolic curve equation.
[014] In still another non-limiting embodiment of the present disclosure, the method further comprising generating a second RF command signal of a second predetermined power level upon second time pressing a key of the communicating device; and transmitting the second RF signal to the Electronic Control unit of the vehicle, wherein the second RF command signal comprising a second plurality of RF frames, and power level of each of the second plurality of RF frames varies among each other, wherein power level of each of the second plurality of frames is more than the power level corresponding to a predetermined minimum coverage range between the communicating device and the Electronic Control Unit of the vehicle.
[015] In still another non-limiting embodiment of the present disclosure, wherein the power level of each of the second plurality of RF frames varies among each other based on

any one of the multiple curve equations that includes but not limited to an exponential, a sawtooth, a triangular, a gaussian, an inverse square and a parabolic curve equation, wherein curve equation satisfied by the second plurality of RF frames is different from the curve equation satisfied by the first plurality of RF frames.
[016] In still another non-limiting embodiment of the present disclosure, the communicating device is a key fob.
[017] In another non-limiting embodiment of the present disclosure, a communicating device is disclosed. The communicating device comprising at least one key; a generating unit configured to generate a first RF command signal of a first predetermined power level upon first time pressing one of at least one key of the communicating device; and a transmitting unit configured to transmit the first RF command signal to an Electronic Control unit of the vehicle, wherein the first RF command signal comprising a first plurality of RF frames, characterized in that a power level of each of the first plurality of RF frames varies among each other, and wherein power level of each of the first plurality of frames is more than the power level corresponding to a minimum allowed coverage range between the communicating device and the vehicle.
[018] In yet another non-limiting embodiment of the present disclosure, a communicating device is disclosed. The communicating device comprising at least one key; a processor configured to generate a first RF command signal of a first predetermined power level upon first time pressing one of at least one key of the communicating device; and; and transmit the first RF command signal to an Electronic Control unit of the vehicle, wherein the first RF command signal comprising a first plurality of RF frames, characterized in that a power level of each of the first plurality of RF frames varies among each other, and wherein power level of each of the first plurality of frames is more than the power level corresponding to a minimum allowed coverage range between the communicating device and the vehicle.
[019] In yet another non-limiting embodiment of the present disclosure, the authentication step comprises verifying authenticity of the user using a key fob, and sending

the unauthorized user access command upon determining that the user is unauthorized user.
[020] 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.
OBJECTS OF THE INVENTION
[021] The main object of the present disclosure is to provide optimal RF range without affecting battery life for vehicle finder application.
[022] Another main object of the present disclosure is to enhance the security of the vehicle
finder application by encoding different curve patterns in sending the RF transmitter frames.
[023] Yet another object of the present disclosure is to provide a flexible and cost-efficient solution for battery saving of a communicating device.
[024] Yet another object of the present disclosure is to improve battery life of the electronic
key by saving overall power of a communicating device.
[025] Yet another object of the present disclosure is to save power of a communicating device
by providing tradeoff between multiple power levels of the battery in lieu of range.
EFFECTS/ADVANTAGES OF THE PRESENT INVENTION
[026] The present disclosure aims to provide an optimized RF transmitter strategy for
saving battery life of the communicating device (i.e., interchangeably used as electronic key/key fob/smart key throughout the disclosure). The present discloses provides an improved method for saving overall power of an electronic key by providing tradeoff between multiple power levels of radio frequency (RF) transmitter frames, in lieu of range. Further, the present

disclosure enhances the security of the vehicle by sending different curve patterns in a non-deterministic way corresponding to the different curve equations for the RF transmitter frames. In other words, the advantage of using different patterns for the different button/key press in vehicle finder application enhances the security of the vehicle finder application, so that it will not be impacted upon by attacks e.g., relay attack. Thus, the present disclosure is more flexible and cost-efficient.
BRIEF DESCRIPTION OF DRAWINGS:
[027] 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 embodiments. 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 communicating device 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:
[028] FIG. 1 illustrates a diagram of an environment indicating a communication between a communicating device and an electronic control unit (ECU) of a vehicle for saving battery life of the communicating device, according to an embodiment of the present disclosure.
[029] FIGs. 2a and 2b illustrate a block diagram of the ECU and the communicating device for saving battery life of the communicating device, according to an embodiment of the present disclosure.
[030] FIG. 3 discloses a flowchart of method steps carried out for saving battery life of the communicating device, according to an embodiment of present disclosure.

[031] FIG. 4 illustrates a graph where power levels corresponding to RF frames are shown in an incremental order, according to an embodiment of present disclosure.
[032] It should be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative devices embodying the principles of the present subject matter.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
[033] Referring now to the drawings, there is shown an illustrative embodiment of the disclosure “a method for battery saving of a communicating device and a communicating device thereof”. It is understood that the disclosure is susceptible to various modifications and alternative forms; specific embodiments thereof have been shown by way of example in the drawings and will be described in detail below. It will be appreciated as the description proceeds that the disclosure may be realized in different embodiments.
[034] 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.
[035] 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 scope of the disclosure.
[036] The terms “comprises”, “comprising”, “include(s)”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, communicating device 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 communicating device or method. In other words, one or more elements in a communicating device or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the communicating device or apparatus.
[037] According to an aspect of the present disclosure, a technique for battery/power saving of a communicating device is disclosed. The disclosed technique relies on optimization of a plurality of RF transmitter frames, included in a RF command signal, sent to an ECU of the vehicle upon pressing a single key/button. The plurality of RF transmitter frames is sent for different button/key press with different power levels followed by encoding different curve patterns. The advantage of using different patterns for the different button press in vehicle finder enhances the security of the vehicle finder application, so that it will not be impacted upon by attacks e.g., relay attack etc. Thus, the disclosed technique provides an optimal RF range without affecting battery life for vehicle finder application.
[038] Specifically, the technique discloses generating a first RF command signal of a first predetermined power level upon first time pressing a key of the communicating device. In other words, upon first time pressing the key, the communicating device will send a stipulated number of frames where each frame will carry a different power level as compared to other frame. In order to achieve RF optimal range without affecting battery life the power level of each of the first plurality of frames is more than the power level corresponding to a minimum allowed coverage range between the communicating device and the ECU of a vehicle. The communicating device transmits the first RF command signal to an ECU of the vehicle.
[039] According to another aspect of the present disclosure, the above technique discloses that power level of each of the first plurality of RF frames varies among each other satisfy any one of the multiple curve equations such as an exponential, a sawtooth, a triangular, a gaussian inverse square, a parabolic curve equation. In this way, the technique disclosed in present disclosure allows for saving battery power of a communicating device, thereby providing an efficient trade off battery power in lieu of range.

[040] In the following detailed description of the embodiments of the disclosure, reference is made to the accompanying drawings that form a part thereof and are shown by way of illustration of 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.
[041] FIG. 1 shows an exemplary environment 100 indicating an interaction between an ECU 102 of a vehicle 106 and a communicating device 104 according to an embodiment of the present disclosure.
[042] The detailed explanation of the exemplary environment 100 is explained in conjunction with Figures 2a and 2b that show a block diagram indicating various components of the communicating device 104 and the ECU 102 of the vehicle 106, in accordance with an embodiment of the present disclosure.
[043] In one implementation, the vehicle 106 may comprise the electronic control unit 102 which may communicate with the communicating device 104. In an exemplary embodiment, the ECU 102 may reside inside the vehicle 106. In another embodiment, the ECU 102 may reside outside the vehicle 106. In an exemplary embodiment, the vehicle 106 may refer to any one of two-wheeler vehicles, three-wheeler vehicles, or four-wheeler vehicles etc. Also, the vehicle 106 may refer to any one of electric vehicle, autonomous vehicle, and so on. In one embodiment, the communicating device 104 may refer to a key fob. In another embodiment, the communicating device 104 may refer to a radio frequency (RF) transmitter. It is well noted to a person skilled in the art that the size, and shape of the key fob 104 may vary and should not be taken into limited sense. Moreover, though the electronic key 104 is shown with three keys/buttons, however any number of buttons/keys may be present. Also, as shown in figure 1, the key fob represents the electronic key, however in some cases, any other suitable key fob which performs similar functionality may be used. As shown in fig 1, the

communicating device 104 communicates with the ECU 102 by wireless means. However, the communicating device 104 may communicate with the ECU 102 by wired means.
[044] In an aspect of the present disclosure, the communicating device 104 generates a RF command signal 108 of a predetermined power level upon first time pressing a key/button of the communicating device 104. The RF command signal 108 may comprise a plurality of RF frames where each RF frame carries a power level different from other frames. Although in figure 1, the RF command signal 108 includes three frames, however, any number of frames may be included in the RF command signal. As shown in fig. 1, the communicating device 104 transmits the RF command signal to the ECU 102 of the vehicle 106.
[045] In another exemplary embodiment, the ECU 102 may be coupled to a memory (not shown). The memory may be configured to store information related to authentication codes, user data, and so on to serve the purpose of the invention. In a non-limiting example, memory may be an external memory chip, which may reside outside the ECU 102 or an inbuilt EEPROM memory, within the ECU 102. In an embodiment, the memory may be a computer-readable medium known in the art including, for example, volatile memory, such as static random-access memory (SRAM) and dynamic random-access memory (DRAM), and/or synchronous dynamic random-access memory (SDRAM) and/or non-volatile memory, such as read only memory (ROM), erasable programmable ROM, flash memories, hard disks, optical disks, and magnetic tapes.
[046] In another implementation, the communicating device 204 may comprise a key 206a, 206b coupled to a processor 208, and a memory 210. In an embodiment, the key 206a, 206b may refer to a button on the key fob. The processor 208 may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuitries, and/or any devices that manipulate signals based on operational instructions. Among other capabilities, the processor 208 may be configured to fetch and execute computer-readable instructions stored in the memory 210. Further, the memory may be configured to store predetermined power levels of each RF command signal and power levels of individual RF frames, etc. Furthermore, the memory 210

may be configured to perform similar functionality as described in above paragraph [0045]. Repetition of the same is avoided for the sake of brevity.
[047] In accordance with present disclosure, the processor 208 may be configured to generate a first RF command signal 108 of a first predetermined power level upon first time pressing one of at least one key/button of the communicating device 104. The first RF command signal 108 may comprise a first plurality of RF frames in which a power level of each of the first plurality of RF frames varies among each other. In an exemplary embodiment, the power levels may be assigned to the first plurality of RF frames in an incremental order to achieve the desired range. In other words, the communicating device 104 may alter the power levels for each next incremental frame in a gradual manner as shown in graph of fig. 4. Moreover, a skilled person will appreciate the graph as shown in fig. 4 is mere an exemplary scenario to show the power levels of the RF frames in the incremental order and should not be taken into limiting sense.
[048] For example, if three RF frames are present in a first RF command signal, a first RF frame may carry a power level of 3 dBm, a second RF frame may carry a power level of 6 dBm, and a third RF frame may carry a power level of 8 dBm. It may be well noted to a person skilled in the art that three RF frames in the first command signal are taken to understand the invention with an ease and should not limit the scope of the invention.
[049] In another embodiment, the power level of each of the first plurality of frames is more than the power level corresponding to a minimum allowed coverage range between the communicating device 104 and the vehicle 106. To understand this, referring to the graph of fig. 4, where first two columns do not follow the criteria of minimum allowed coverage. Therefore, the three RF frames corresponding to last three columns must carry power levels above the 2 dBm and that too different power levels among each other in an incremental order. For example, the minimum allowed coverage range between the communicating device and the vehicle is 2 m, then the power level of each RF frame must be more than 2 dBm in order to provide an optimal range. This is merely an example to understand the invention with more clarity and should not be taken into limiting sense.

[050] In another embodiment, the power level of each of the first plurality of RF frames varies among each other based on any one of the multiple curve equations that includes but not limited to an exponential, a sawtooth, a triangular, a gaussian, inverse square, a parabolic curve equation. In other words, the key fob, or the communicating device 104 may follow different patterns for the change of RF power levels for e.g., in one button press, the communicating device 104 may send a stipulated number of frames constituting different power levels, which will ultimately satisfy the curve equation for exponential. In second button press, the communicating device 104 may send a stipulated number of frames constituting different power levels, which will satisfy sinusoidal curve equation by calculation. Likewise different curve patterns are encoded for consecutive button press, to be iterated till another predefined/stipulated number of button press. In an exemplary embodiment, the specific curve patterns may be mutually agreed upon by ECU/Receiver and key fob/communicating device/transmitter simultaneously so as to achieve synchronization. In another exemplary embodiment, the different patterns for the change of RF power levels may satisfy the following curve equations:
• Exponential: y = ex
• Sawtooth: sin(x) - 1⁄2sin(2x) + 1⁄3sin(3x) - 1⁄4sin(4x) + 1⁄5sin(5x) - 1⁄6sin(6x) + ...
• Sinusoidal: y = sin(x)
• Square: y = x2
• Reciprocal square: y = 1/x2
• Parabolic: y2 = 4.a.x
It is to be noted that aforementioned curve equations are few sample curves, however any other suitable curve equations may be used to perform the similar functionality. The advantage of using different patterns for the different button/key press in vehicle finder enhances the security of the vehicle finder application, so that it will not be impacted upon by attacks e.g., relay attack. It may be worth noted to a person skilled in the art that the concept of the present disclosure is not limited to vehicle finder application and may be applicable to applications which may required to perform the similar functionality.

[051] In another aspect of the present disclosure, the processor 208 may be configured to transmit the first RF command signal 108 to the ECU 102 of the vehicle 106. Thus, it may be worth noted that the present disclosure relies on optimization of RF transmitter frames, whereby different power levels are sent in different RF frames in a single button press. Thus, the aggregate of power is less than the sum of all power levels of all the consecutive frames sent in a single button press. Advantageously, the present disclosure aims in battery power saving with a marginal impact on the achieving the range. This will establish a trade-off between battery life and the range.
[052] In another embodiment of the present disclosure, the processor 208 may be configured to generate a second RF command signal of a second predetermined power level upon second time pressing a key of the communicating device 104. The second RF command signal may comprise a second plurality of RF frames and power level of each of the second plurality of RF frames varies among each other. In other words, different power levels may be assigned to each of the RF frame among the second plurality of RF frames. In an exemplary embodiment, the power levels may be assigned to the second plurality of RF frames in an incremental order to achieve the desired range. Also, the power level of each of the second plurality of frames is more than the power level corresponding to a predetermined minimum coverage range between the communicating device and the ECU 102 of the vehicle 106. Furthermore, the power level of each of the second plurality of RF frames varies among each other based on any one of the multiple curve equations that includes but not limited to an exponential, a sawtooth, a triangular, a gaussian, an inverse square and a parabolic curve equation, wherein curve equation satisfied by the second plurality of RF frames is different from the curve equation satisfied by the first plurality of RF frames.
[053] Let us take an example for understanding the invention with an ease. In accordance with the present disclosure, when a user presses a key or button on a key fob for the first time, the key fob transmits a signal to an ECU of a vehicle. The signal may comprise three frames which are assigned different power levels. Let’s say a first frame may be assigned power level of 3 dBm, a second frame may be assigned power level of 6 dBm, and a third frame may be assigned power level of 8 dBm. The power level of each frame must be greater than the power

level corresponding to a minimum coverage range between the key fob and the ECU of the vehicle (for e.g., power level corresponding to a minimum coverage range may be 2 dBm in this example). Further, each frame is encoded with different patterns that satisfy different curve equations as discussed earlier. Further, in a case where first frame did not reach to the vehicle, the second frame with high power may reach to the ECU of the vehicle else third frame with higher power than the first and second frame may reach to the ECU of the vehicle and corresponding action may be performed by the ECU upon receiving the third frame. Thus, by assigning different power levels to each frame, battery power can be saved, and the battery of the key fob may be extended to a great extent as compared to existing arts where same power is assigned to each RF frame. In other words, let’s say in existing prior arts the power level is kept as 10 dBm for each frame, then the total aggregate power may be calculated as sum of 10 dBm + 10 dBm + 10 dBm = 30 dBm. However, in accordance with the present disclosure, different power levels are used such as 3 dBm, 6 dBm, and 8 dBm whose total aggregate power may be calculated as sum of 3 dBm + 6 dBm + 8 dBm = 17 dBm which is much less than the existing prior arts. Accordingly, in each key press the present disclosure saves the overall power (earlier it was 30 dBm and in the multiple power level it is 17 dBm, that is battery saving of 13 dBm is achieved), thus trading off battery power in lieu of range. In other words, the present disclosure relates to tradeoff between battery life and range in a vehicle finder application. More particularly but not exclusively, the present disclosure relates to a communicating device and methods for improving the battery life of the communicating device without compromising range to a greater extent for finding a vehicle in vehicle finder application.
[054] In another embodiment, suppose the signal is not reached to the ECU of the vehicle upon pressing the key/button on the key fob for the first time, then the user may press the key for second time. This time also the key fob may transmit a second signal which may comprise any number of frames and each frame may comprise different power levels with different encoded pattern that satisfy different curve equations. The step of pressing the key/button on the key fob and the functionality disclosed in accordance with the pressing of the key fob may be iterated until the action associated with the key press is not performed by the ECU of the vehicle.

[055] In some aspect of the present disclosure, the ECU may comprise an authentication unit (not shown) configured to authenticate a user accessing the vehicle. The authentication unit may verify the authenticity of the user accessing the vehicle via a communicating device. In an embodiment, the authentication unit may be configured to perform a desired action upon successfully authenticating the user. For example, if a user is accessing the vehicle through the key fob, then the user may be considered as authorized user. This will enhance the security for lock and unlock mechanism performed in the vehicle.
[056] In another implementation, the communicating device 204 may comprise a generating unit 212, and a transmitting unit 214. The generating unit 212 and the transmitting unit 214 may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, state machines, logic circuitries, and/or any devices that manipulate signals based on operational instructions. Among other capabilities, the generating unit 212 and the transmitting unit 214 may be configured to fetch and execute computer-readable instructions stored in a memory (not shown in fig. 2b). Further, the memory may be configured to perform similar functionality as described in above paragraph [0045]. Repetition of the same is avoided for the sake of brevity. In another embodiment, the data/information may be stored within the memory in the form of various data structures. The memory may also store other data such as temporary data and temporary files, generated by the various units 212 and 214 for performing the various functions of the communicating device 104.
[057] While the components 206-214 are illustrated and described herein with respect to a communicating device 204 may form essential components to carry out the present disclosure, it may be worth noted that the communicating device 204 may comprise other/additional components as well which are not shown for the sake of brevity and are used in conjunction with the illustrated components to implement present disclosure.
[058] In accordance with the present disclosure, the generating unit 212 and the transmitting unit 214 may be configured to perform desired functionality similar to the

processor 208. In other words, the generating unit 212 may be configured to generate a first RF command signal 108 of a first predetermined power level upon first time pressing one of at least one key of the communicating device. The first RF command signal 108 comprising a first plurality of RF frames, characterized in that a power level of each of the first plurality of RF frames varies among each other, and wherein power level of each of the first plurality of frames is more than the power level corresponding to a minimum allowed coverage range between the communicating device 104 and the vehicle 106. Further, the transmitting unit 214 may be configured to transmit the first RF command signal 108 to the ECU 102 of the vehicle 106. Moreover, a person skilled in the art will appreciate that the generating unit 212 and the transmitting unit 214 may perform the functionality provided by the processor in para. [052]. The repetition of the same is avoided for the sake of brevity.
[059] FIG. 3 discloses a flowchart of a method 300 for battery saving of an electronic key/communicating device 104, according to an embodiment of present disclosure. The method 300 is explained in conjunction with figures 1-2 for the sake of better understanding.
[060] The method 300 starts at block 302 by generating a first RF command signal 108 of a first predetermined power level upon first time pressing a key of the communicating device 104. The first RF command signal 108 may comprise a first plurality of RF frames where a power level of each of the first plurality of RF frames varies among each other.
[061] Further, the method may describe that the power level of each of the first plurality of frames is more than the power level corresponding to a minimum allowed coverage range between the communicating device 104 and the ECU 102 of the vehicle 106. The method 300 at 302 may be performed by the communicating device 102. In another embodiment, the method 300 at block 302 may be performed by the processor 208 or the generating unit 212.
[062] In another embodiment, the method may describe that the power level of each of the first plurality of RF frames varies among each other based on any one of the multiple curve equations that includes but not limited to an exponential, a sawtooth, a triangular, a gaussian inverse square, a parabolic curve equation.

[063] The method ends at block 304 by transmitting the first RF command signal 108 to an ECU 102 of the vehicle 106. The method at 304 may be performed by the communicating device 104. In another embodiment, the method 300 at block 304 may be performed by the processor 208 or the transmitting unit 214.
[064] The method may further comprise generating a second RF command signal of a second predetermined power level upon second time pressing a key of the communicating device. The second RF command signal comprising a second plurality of RF frames, and power level of each of the second plurality of RF frames varies among each other. The method may further describe that the power level of each of the second plurality of frames is more than the power level corresponding to a predetermined minimum coverage range between the communicating device and the ECU of the vehicle. Furthermore, the method may describe that the power level of each of the second plurality of RF frames varies among each other based on any one of the multiple curve equations that includes but not limited to an exponential, a sawtooth, a triangular, a gaussian, an inverse square and a parabolic curve equation. Also, the curve equation satisfied by the second plurality of RF frames is different from the curve equation satisfied by the first plurality of RF frames. In another embodiment, the method may further comprise step of transmitting the second RF signal to the ECU of the vehicle.
[065] The illustrated steps are set out to explain the exemplary embodiments shown, and it should be anticipated that ongoing technological development will change the manner in which particular functions are performed. These examples are presented herein for purposes of illustration, and not limitation. Further, the boundaries of the functional building blocks have been arbitrarily defined herein for the convenience of the description. Alternative boundaries can be defined so long as the specified functions and relationships thereof are appropriately performed.
[066] Furthermore, one or more computer-readable storage media may be utilized in implementing embodiments consistent with the present disclosure. 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., are non-transitory. Examples include random access memory (RAM), read-only memory (ROM), volatile memory, nonvolatile memory, hard drives, CD ROMs, DVDs, flash drives, disks, and any other known physical storage media.
[067] Suitable processors include, by way of example, a general-purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of integrated circuit (IC), and/or a state machine.
[068] Those of skill would further appreciate that the various illustrative blocks, units, modules and algorithm steps described in connection with the aspects disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall communicating device. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
[069] While the present disclosure has been described by way of example and in terms of the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. To the contrary, it is intended to cover various modifications and

similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
[070] Reference Numerals:

100 Generic environment
102 Electronic Control Unit
104 Communicating Device
106 Vehicle
108 RF Command Signal
200 Block Diagram of Communicating device in communication with the ECU of the vehicle
202 Electronic Control Unit
204 Communicating Device
206 a 206 b Key/ Button
208 Processor
210 Memory
212 Generating Unit
214 Transmitting Unit
300 Method Flowchart
302-304 Method steps

WE CLAIM:
1. A method comprising:
generating, by a communicating device, a first RF command signal of a first predetermined power level upon first time pressing a key of the communicating device; and
transmitting, by the communicating device, the first RF command signal to an Electronic Control Unit (ECU) of the vehicle,
wherein the first RF command signal comprising a first plurality of RF frames, characterized in that a power level of each of the first plurality of RF frames varies among each other, and wherein power level of each of the first plurality of frames is more than the power level corresponding to a minimum allowed coverage range between the communicating device and the ECU of the vehicle.
2. The method as claimed in claim 1, wherein the power level of each of the first plurality of RF frames varies among each other based on any one of the multiple curve equations that includes but not limited to an exponential, a sawtooth, a triangular, a gaussian inverse square, a parabolic curve equation.
3. The method as claimed in claim 1, further comprising:
generating a second RF command signal of a second predetermined power level upon second
time pressing a key of the communicating device; and
transmitting the second RF signal to the Electronic Control unit of the vehicle,
wherein the second RF command signal comprising a second plurality of RF frames, and
power level of each of the second plurality of RF frames varies among each other,
wherein power level of each of the second plurality of frames is more than the power level
corresponding to a predetermined minimum coverage range between the communicating device and
the Electronic Control Unit of the vehicle.
4. The method as claimed in claim 3, wherein the power level of each of the second plurality of
RF frames varies among each other based on any one of the multiple curve equations that includes
but not limited to an exponential, a sawtooth, a triangular, a gaussian, an inverse square and a
parabolic curve equation, wherein curve equation satisfied by the second plurality of RF frames is
different from the curve equation satisfied by the first plurality of RF frames.

5. The method as claimed in claim 1-4, wherein the communicating device is key fob.
6. A communicating device comprising: at least one key;
a generating unit configured to generate a first RF command signal of a first predetermined power level upon first time pressing one of at least one key of the communicating device; and
a transmitting unit configured to transmit the first RF command signal to an Electronic Control unit of the vehicle,
wherein the first RF command signal comprising a first plurality of RF frames, characterized in that a power level of each of the first plurality of RF frames varies among each other, and wherein power level of each of the first plurality of frames is more than the power level corresponding to a minimum allowed coverage range between the communicating device and the vehicle.
7. A communicating device comprising:
at least one key; and
a processor configured to:
generate a first RF command signal of a first predetermined power level upon first time pressing one of at least one key of the communicating device; and
transmit the first RF command signal to an Electronic Control unit of the vehicle, wherein the first RF command signal comprising a first plurality of RF frames, characterized in that a power level of each of the first plurality of RF frames varies among each other, and wherein power level of each of the first plurality of frames is more than the power level corresponding to a minimum allowed coverage range between the communicating device and the vehicle.