RELATED APPLICATIONS 
     The present application is based on, and claims priority from, U.S. Provisional Application No. 61/376,849, filed Aug. 25, 2011, the disclosure of which is hereby incorporated by referenced herein in its entirety. 
    
    
     BACKGROUND 
     Currently, personal devices are manufactured and sold containing a finite set of wireless communication methods. This set can be null, that is, the personal device has no communication capability, or it can have a limited number of communication methods. 
     However, after time of sale, the user may require an additional or newly fielded communication method which was beyond the capability of the personal device at the time of sale. 
     Or, it may be found that the existing communication capability of the personal device does not provide adequate connectivity, or subjects the user or network carrier to roaming charges or other expensive fees. In either case, to overcome these limitations, the user currently must purchase an entirely new personal device containing the required additional communication methods. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       One or more embodiments are illustrated by way of example, and not by limitation, in the figures of the accompanying drawings, wherein elements having the same reference numeral designations represent like elements throughout and wherein: 
         FIG. 1  is a high-level functional block diagram of a personal device containing an unmodified battery module assembly; 
         FIG. 2  is a high-level functional block diagram of a personal device containing a battery module assembly which has been modified to include communication circuitry, according to an embodiment of the invention; 
         FIG. 3  is a high-level functional block diagram of a personal device with modified battery, according to an embodiment of the invention, illustrating one method by which the personal device may use the modified battery to communicate with the WWAN; 
         FIG. 4  is a decision-flow diagram of processing in a personal device with modified battery, according to an embodiment of the invention, illustrating one method by which the personal device may decide to use the modified battery to communicate with the WWAN; 
         FIG. 5  is a decision-flow diagram of processing in a personal device with modified battery, according to another embodiment of the invention, illustrating another method by which the personal device may decide to use the modified battery to communicate with the WWAN; and 
         FIG. 6  is a high-level functional block diagram of a personal device with modified battery, according to one embodiment of the invention, illustrating one method by which the modified battery in the hosting personal device, may be used to redistribute the communication with the WWAN, to one or multiple external personal devices, using near-field communication. 
     
    
    
     DETAILED DESCRIPTION 
     One or more embodiments of the present invention provide a way to update or extend the communication capability of the personal device without the user or carrier having to purchase an entirely new personal device. 
     Using one or more embodiments, a user may purchase, or be provided by a carrier, a modified battery pack containing the additional communication method. The personal device then uses the circuitry contained in the modified battery pack to communicate to the WWAN, instead of or in addition to its current capability. 
     For instance, when a new communication method such as 4 th -Generation (4 G) Wireless is fielded by the carrier, the existing personal device containing only2 nd- Generation or 3 rd- Gen Wireless capability need not be rendered obsolete. Instead, a modified battery pack containing 4 G Wireless communication circuitry may be inserted in the existing personal device, such that the personal device now can utilize 4 G Wireless communication capability. The same method can be used to provide a 4 G Wireless device with second generation or third generation WWAN capabilities, where the WWAN modem in the battery pack adds to the WWAN capabilities of the device. 
       FIG. 1  depicts a high-level functional block diagram of a personal device  100  in which an embodiment of the present invention may be incorporated. The personal device is portable, meaning it is powered by a battery module  104  containing control and charging circuitry  105 , with the majority of the battery volume of the assembly taken up by energy storage cells  106  using chemical technology such as Lithium-Ion or Nickel-Cadmium, for example. 
     In portable personal devices, the battery assembly usually forms a removable module  104  contained within a distinct battery compartment  102 . The battery module usually can be removed either by hand manipulation, or using simple tools. The reason for this modularity is that the battery assembly sometimes requires replacement. The storage cells or control circuitry may fail, may need updating to increase capacity, or may need replacing to reduce weight and size through technology improvements. 
     The personal device may have been manufactured containing a set of one or more methods of communication  103  with the Internet, Wireless WWAN, or other personal devices. Examples of communication methods built into the personal device at time of manufacture include (1) Telecommunications Industry Association (TIA) standard Ev-DO, revisions 0, A, and B; (2) Third-Generation Partnership Project (3GPP) standard UMTS and its variations High-Speed Packet Data (HSPA); (3) 3rd Generation Partnership Project 2 (3GPP2) standard IS-2000; (4) Groupe Special Mobile standard Global System for Mobile Communications (GSM) and its variation Enhanced Data rates for GSM Evolution (EDGE); (5) Bluetooth; and (6) Institute of Electrical and Electronics Engineers (IEEE) 802.11 Wireless LAN (aka “WiFi”). 
     The set of communication capabilities  103  built into the personal device during manufacture and at time of sale, are usually fixed, that is, the electronics implementing these communication capabilities are not removable and cannot be replaced or upgraded easily. 
     After time of sale, the user may require an additional or newly-fielded communication method which was beyond the capability of the personal device at the time of sale. Or, it may be found that the existing communication capability  103  of the personal device does not provide adequate connectivity, or subjects the user or network carrier to roaming charges or other expensive fees. 
     To overcome these limitations without the invention described in one or more embodiments of this disclosure, the user currently must purchase an entirely new personal device containing the required additional communication methods. 
     For instance, if an owner of a personal device containing only EvDO (a “3rd-Generation” wireless Internet access technology) needs to access the Internet using the newly-fielded Long-Term-Evolution (LTE) standard, there is currently no easy way for the owner of the personal device to accomplish this, unless an entirely-new personal device containing hardware which implements the LTE standard is purchased. 
     This can be costly for the user, and wasteful of otherwise useful personal device hardware. The personal device may contain a high-cost and high-performance display, keypad, memory, audio and video camera hardware, and be in perfect working order for some communication uses. But for want of the set of newly-required communication capabilities, the entire device may be rendered obsolete and in need of replacement. 
       FIG. 2  depicts a high-level functional block diagram of a personal device  200  as in  FIG. 1 , but in which an embodiment of the present invention has been incorporated. In  FIG. 2 , the removable battery assembly  204  has been modified to incorporate an additional set of communication methods ( 207 ,  208 ) using circuitry ( 207 ,  208 ,  209 ,  210 ) designed to fit within the volume footprint of the battery assembly. 
     The additional communication circuitry ( 207 ,  208 ) inserted into the battery assembly may include Radio Frequency (RF) power amplifiers (PA), low-noise receiver amplifiers (LNA), frequency down-converters and digitizing hardware, baseband processing microprocessors and other discrete circuitry, and antennas ( 209 ,  210 ). 
     In the embodiment shown in  FIG. 2 , the set of communication methods ( 207 ,  208 ) include circuits designed to implement near-field communication  208  between the modified battery module and hosting personal device, as well as circuits designed to implement various WWAN standards  209 . Examples of WWAN standards implemented by the modified battery  200  may include 3GPP Long-Term Evolution (LTE) and TIA standard EvDO. Examples of near-field communication implemented by the modified battery  200  may include Bluetooth or 802.11 Wireless LAN. 
     The additional communication circuitry ( 207 ,  208 ,  209 ,  210 ) inserted into the battery assembly is powered by the battery cells  206  and control circuitry  205 , as is the hosting personal device. To accommodate the additional communication circuitry ( 207 ,  208 ,  209 ,  210 ), the battery&#39;s chemical cell  206  size has been reduced, resulting in somewhat reduced battery capacity and resulting increased frequency of charging the personal device required. 
       FIG. 3  depicts a high-level functional block diagram of a personal device  300  as in  FIGS. 1 and 2 , but illustrating how one embodiment of the present invention has been incorporated and is used by the hosting personal device. 
     Following  FIG. 3 , in one example embodiment, the personal device connects to the modified battery module using IEEE 802.11 Wireless LAN  320 . The modified battery module communicates to the WWAN  310  using Long-Term Evolution (LTE), which in this example the personal device  300  did not support at time of manufacture. In this embodiment, the modified battery effectively presents a WiFi “hotspot” for the personal device to initiate and continue a TCP/IP data connection to the Internet using the LTE WWAN. 
     Also following  FIG. 3 , in another example embodiment, the personal device connects to the modified battery module using Bluetooth Near Field Communication (NFC)  300 . The modified battery module communicates to the WWAN  310  using 1X-CDMA2000. In this example, the personal station only supports GSM circuit-switched calls. In this embodiment, the modified battery effectively presents a way for the personal device to initiate and continue a circuit-switched telephone connection. In this example, the personal station avoids expensive roaming charges over a non-Home GSM network when there is a Home CDMA2000 network available to use. 
       FIG. 4  depicts a high-level decision-tree diagram  400  illustrating how, in one embodiment of the present invention, the personal device and modified battery pair as shown in  FIGS. 1 ,  2  and  3 , may decide when to use either the host device&#39;s communication circuitry, or the modified battery&#39;s communication circuitry, to provide service to the user. 
     Following  FIG. 4 , in one example embodiment, when the personal device is powered on  401 , the personal device and modified battery both attempt to acquire service  402 . Subsequently, the personal device acquires Service A, while the modified battery acquires Service B. Service A and B may be one of a set of communication methods such as, but not limited to: No Service, CDMA-2000, GSM/EDGE, EvDO, UMTS/HSPA, LTE, or other wireless communication technology. 
     After both personal device and modified battery acquire service, software implementing decision criteria ( 404 ,  405 ), contained within either the personal device, or modified battery, or both, makes note of the signal strength and roam status of both Service A and Service B. 
     In the first decision criteria evaluation  404 , if Service A&#39;s roam status is TRUE (Roaming on non-Home system) or signal strength is weak, a further decision criteria  405  is evaluated, that is, if Service B&#39;s roam status is TRUE (Roaming on non-Home system) signal strength is weak. 
     In the embodiment of  FIG. 4 , if Roam status of Service A is FALSE (in Home system not roaming), and if Service A&#39;s signal strength is strong (not weak), the personal device will use Service A to provide service to the user (action block  407 ). 
     Also in the embodiment of  FIG. 4 , if Roam status of Service B is TRUE (Roaming on non-Home system), or if Service B&#39;s signal strength is weak (not strong), the personal device will still use Service A to provide service to the user (action block  407 ). 
     Finally, in the embodiment of  FIG. 4 , if Roam status of Service A is TRUE (Roaming on non-Home system) or if Service A&#39;s signal strength is weak (not strong), AND, if the Roam status of Service B is FALSE (in Home system not roaming), and if Service B&#39;s signal strength is strong (not weak), the personal device will use Service B to provide service to the user (action block  406 ). 
       FIG. 5  depicts a high-level decision-tree diagram  500  illustrating, in another embodiment of the present invention, how a personal device and modified battery pair as shown in  FIGS. 1 ,  2  and  3 , may decide when to use either the host device&#39;s communication circuitry, or the modified battery&#39;s communication circuitry, to provide service to the user. 
     Following  FIG. 5 , in another example embodiment, when the personal device is powered on  501 , the personal device and modified battery both attempt to acquire service. Subsequently, the personal device acquires Service A, while the modified battery acquires Service B ( 502 ). Service A and B may be one of a set of communication methods such as, but not limited to: No Service, CDMA-2000, GSM/EDGE, EvDO, UMTS/HSPA, LTE, or other wireless communication technology. 
     After both personal device and modified battery acquire service  502 , software implementing decision criteria ( 504 ,  505 ), contained within either the personal device, or modified battery, or both, makes note of the relative preference (to user or carrier), and instantaneous data performance inherent in both Service A and Service B ( 503 ). 
     Then, in a first decision criterion  504  if Service B uses a technology which is preferred to Service A, a further decision criteria  505  is evaluated, that is, the instantaneous data service performance adequacy (such as serving data rate capability for example) of Service B relative to some minimum performance criterion. 
       FIG. 6  depicts a high-level functional block diagram of a personal device  600  as in  FIGS. 1 and 2 , but illustrating one method by which the modified battery in the hosting personal device, may be used to redistribute the communication with the WWAN, to one or multiple external devices, using near-field communication. 
     Following  FIG. 6 , in one example embodiment, the personal device connects to the modified battery module using IEEE 802.11 Wireless LAN or Bluetooth  620 . The modified battery module communicates to the WWAN  610  using Long-Term Evolution (LTE), which in this example the personal device  600  did not support at time of manufacture. In this embodiment, the modified battery effectively presents a WiFi or Bluetooth “hotspot” for both the hosting personal device  600 , and one or multiple external personal devices  630 , to initiate and continue a TCP/IP data connection to the Internet using the LTE WWAN.
One or more embodiments of the present invention disclose a system and method for enhancing the communication capabilities of a personal electronic device by modifying its existing battery module, adding communication circuitry to the modified module, and providing for the personal device to communicate in a Wireless Wide Area Network (WWAN) via this modified battery module. The system and method consists of a personal device's existing battery pack modified to contain one or more wireless communication circuits, the wireless communication circuitry included in the modified battery module, and the method by which the personal device will communicate to the WWAN using the modified battery module. The system can also be used to re-distribute WWAN communication from the modified battery module, to one or more external personal devices, using near-field communications.