Abstract:
A wireless network module is provided to enable at least one electronic device to access wireless services. In an embodiment, a control unit is connected with a first interface connecting to the electronic device, a second interface selectively connecting to another electronic device having a second communication unit the, and a first communication unit providing the ability of first communication, thereby the electronic device connects to the network by the first communication unit, and when the first communication unit cannot be executed the electronic device connects to the network via the second communication unit of another electronic device. Further, the electronic device connected with the second interface also can access wireless services via the first communication unit.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of Invention  
         [0002]     The invention relates to a wireless network module, and more particularly to a wireless network module that enables the electronic device to use wireless access services when they combine with each other.  
         [0003]     2. Description of the Related Art  
         [0004]     The rapid development in network technology has brought human beings a lot of change and convenience in life. In the past, the network always requires a network cable or telephone cable for the data transmission. Nowadays, as applications of electromagnetism develop, it has opened a new world of network—the wireless/mobile Internet, in which the data transmission is by electromagnetic waves rather than by a network cable or telephone cable.  
         [0005]     Wireless/mobile Internet is the idea of using wireless telecommunication techniques and wireless data communication techniques to enable users to access a network for communications, shopping or work using a terminal device, such as a notebook computer, a personal digital assistant (PDA), etc. The wireless telecommunication includes the general packet radio service (GPRS), the global system for mobile communication (GSM), the code division multiple access (CDMA), and the personal handyphone system (PHS), etc. The wireless data communication is such as the wireless local area network (WLAN). Currently, the mostly ways to access the wireless/mobile Internet for users are the GPRS and WLAN, There are advantages and disadvantages respectively. Users select either one of them according to their own preferences.  
         [0006]     GPRS is a technology that equips the terminal device with both communication and data transmission functions. A mobile base station sends signals and uses the packet switch method to replace the circuit switch method in the conventional wired network.  
         [0007]     In the WLAN, a terminal device is combined with an access point (AP) by a wireless network card to perform local area wireless network connection. Then, the AP connects to an external access circuit (e.g. ADSL and devoted lines), thereby the terminal device can access the network and the users can use wireless network resources with the terminal device. In other words, the transmission portion of the user end to the network is converted into a wireless transmission form. Therefore, it has the problem in mobility that a wired network does not have. However, the transmission range in the wireless network is restricted by the distance between the AP and the computer.  
         [0008]     Technically speaking, the transmission range in using GPRS can reach 10 km with a nominal speed of 144 Kbps. In using WLAN, the transmission speed is higher. For example, the transmission speed in 802.11g can reach 54 Mbps. Nevertheless, the transmission range is shorter, only within 100 m around the AP. In addition, the WLAN utilizes the free 2.4 GHz frequency band. Its coverage range is small and the installation cost is low. Although the GPRS costs higher, its application range is wider and its safety is higher. Besides, the GPRS charges by the transmitted data packet quantity, whereas the WLAN charges by the actual communication time. Therefore, the WLAN cost is usually much lower than the GPRS for ordinary users.  
         [0009]     To achieve the hope of accessing the network all the time at a lower cost, many terminal devices have a built-in WLAN wireless network card and allows the insertion of an external GPRS wireless network, or have a GPRS+WLAN wireless network card. In this case, the terminal device uses the WLAN mode to access the network if the WLAN network is available. Otherwise, the terminal device uses the GPRS mode to access the network.  
         [0010]     However, using the mode of built-in WLAN wireless network card and external GPRS wireless network card, the user has to purchase two network cards and bring the GPRS wireless network card just in case of need. Also, a lot of space will be occupied when two cards are used simultaneously.  
         [0011]     The GPRS+WLAN double-mode network card integrates the GPRS and WLAN modules on one interface. As the GPRS module involves more technical difficulty and both GPRS and WLAN are different in their manufacturing processes, working frequencies, and modulation coding, there are the existing problem how to minimize the volume and cost of the combination, how to make the use easier, how to maintain a low power consumption, and how to position the WLAN. The GPRS is performed in 900 MHz, 1800 MHz, or 1900 MHz of frequency bands. The WLAN also includes the 802.11a, 802.11b, and 802.11g standards, each of which has the 2.4 GHz and 5 GHz frequency bands. Moreover, there are PCMCIA, CF, and USB interfaces. Therefore, there are too many possible combinations. Accordingly, the integrating process for the network card that includes more combinations will be more difficult and expensive, whereas those including fewer combinations are more restrictive and less convenient.  
         [0012]     To ensure that the wireless network apparatuses developed by different manufacturers are compatible and stable, they have to be tested by a standard examination institute to check whether they meet the requirements (the wireless data communication standards or wireless telecommunication standards). Therefore, if the wireless data communication (e.g. WLAN) function and the wireless telecommunication (e.g. GPRS) function are integrated in one product, it has to be tested once the standard of one of them is changed. This will increase the replacing rate of products. It will also cause troubles in product research, development and sale.  
         [0013]     As disclosed in R.O.C. patent no. 586640, a converter structure that integrates the wireless network card and the PHS communication module installed two standards converter and can set up a printed circuit board (PCB) of the WLAN in its interior. Therefore, one end of the WLAN card can be connected to various kinds of electronic devices, while the other end can be connected to a PHS communication module so that all the connected electronic devices can access the network.  
         [0014]     Therefore, how to let a user more effectively use wireless telecommunication technology and wireless data communication technology to enjoy network services has become a very important research direction in wireless network products.  
       SUMMARY OF THE INVENTION  
       [0015]     In view of the foregoing, an objective of the invention is to provide a wireless network module to solve the various restrictions and drawbacks existing in the prior art.  
         [0016]     The wireless network module according the present invention provides a wireless communication device to meet the needs of integrating data communications and telecommunications of the market. It is built in with a WLAN module to provide wireless network functions. When it is combined with an electronic device, the electronic device immediately has the wireless networking function. Herein, the electronic devices include computers, such as laptop computers and personal computers, mobile communication devices, e.g. PDA, cell phones, etc, and that require the use of a wireless network.  
         [0017]     Another objective of the present invention is to provide a wireless network module as a converter. When an electronic device is placed in an environment without ability of a wireless network module, the electronic device can use such wireless network module to combine with an electronic device with a wireless telecom module. Thus, the electronic device can enjoy network services via the wireless telecom module. Moreover, when entering the network area with ability of a wireless network module again, the electronic device can immediately switch to use the wireless network module for wireless networking.  
         [0018]     To achieve the above objectives of the present invention, there is provided a wireless network module to enable more than one electronic device with networking functions. It includes: a control unit; a first interface connected to the control unit; a second interface connected to the control unit, wherein one of the first interface and the second interface is connected to the electronic device; and a first wireless communication unit connected to the control unit to provide a first wireless communication function and control the signals between the first wireless communication unit and the interfaces, thereby the electronic device to connect to a network via the first wireless communication unit.  
         [0019]     When the first wireless communication unit cannot provide services, the electronic device is connected to another electronic device with a second wireless communication unit via the second interface. Thus, the electronic device can connect to the network using the second wireless communication unit.  
         [0020]     The invention further provides a wireless network module to enable an electronic device with the networking functions. It includes: a first wireless communication unit; a control unit connected to the first wireless communication unit; a first interface connected to the control unit for the connection of an electronic device; and a second interface connected to the control unit for the connection of another electronic device. The second electronic device includes a second wireless communication unit. The control unit controls the signals between the first wireless communication unit and the interfaces, so that the electronic device can connect to the network via the second wireless communication unit of another electronic device.  
         [0021]     Moreover, a wireless network module according the present invention includes an antenna connected to the first wireless communication unit.  
         [0022]     In a wireless network module according the present invention, the control unit includes a control device; and a memory device. The control device controls the signals between the first wireless communication unit and the interfaces. The memory device saves information obtained by the electronic device via the first wireless communication unit. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0023]     The invention will become more fully understood from the detailed description given herein below. However, this description is for purposes of illustration only, and thus is not limitative of the present invention, wherein:  
         [0024]      FIG. 1  is a block diagram of the wireless network module according to an embodiment of the invention;  
         [0025]      FIG. 2  is a block diagram of the wireless network module according to an embodiment of the invention;  
         [0026]      FIG. 3  is a block diagram of the wireless network module according to an embodiment of the invention;  
         [0027]      FIG. 4  is a block diagram of the wireless network module according to an embodiment of the invention;  
         [0028]      FIG. 5  is a block diagram of the wireless network module according to an embodiment of the invention; and  
         [0029]      FIG. 6  is a block diagram of the wireless network module according to an embodiment of the invention.  
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0030]     With reference to  FIG. 1 , a wireless network module according to an embodiment of the invention enables an electronic device for networking functions. It includes a first wireless communication unit  110 , a first interface  120 , a second interface  130 , and a control unit  140 . Herein, all of them can be installed on a body  100 .  
         [0031]     The first wireless communication unit  110  is used to let the electronic device connect to a network using a communication standard compliant with the first wireless communication unit. The first wireless communication unit includes a wireless datacom module, and that which can provide the wireless datacom function. Besides, the wireless datacom module includes a wireless network module with more than one standard. The wireless data communication standards include 802.11a, 802.11b, 802.11g, etc. The wireless datacom module can use a control chipset to support various kinds of wireless data communication standards. The control chipset includes the Broadcom chip, the Intersil chip, the Zydas chip, SiS16XU chip, the Realtek chip, the RICOH chip, and that which can support various kinds of wireless data communication standards.  
         [0032]     The first and second interfaces  120 ,  130  can be slot interfaces for the connection of an electronic device. The connected electronic device also has the same or a compatible interface. In particular, the first and second interfaces  120 ,  130  have such interface standards as CF, MS, Mspro, SM, MMC, SDIO, PCMCIA, and CardBus. Moreover, one may use a combo interface to increase the compatibility of the different interfaces on the electronic device. For example, the combo interface can be a six-in-one memory interface.  
         [0033]     The electronic device externally connected to the interfaces  120 ,  130  includes a computer, such as a laptop and personal computer, a mobile communication device, such as a PDA and cell phone, and a terminal device which require the use of a wireless network. When the electronic device is connected to one of the interfaces  120 ,  130 , it attains the first wireless communication function via the first wireless communication unit  110 .  
         [0034]     The control unit  140  is used to control signals between the first wireless communication unit  110  and the interfaces  120 ,  130 . It includes a dispatch circuit, which can be a complex programmable logic device (CPLD), an application specific integrated circuit (ASIC), or that which enables the address, data and control signal to communicate between the first wireless communication unit  110  and the interfaces  120 ,  130 . The control unit  140  can rely on a programming for communicating the address, data and control signal between the first wireless communication unit  110  and the interfaces  120 ,  130 .  
         [0035]     When the first wireless communication unit  110  cannot provide services, one of the first and second interfaces  120 ,  130  is connected to an electronic device with the second wireless communication unit. In this case, the control unit  140  is used to control the signals between the first wireless communication unit  110  and the interfaces  120 ,  130  so that the other electronic device connected to the other interface of the interfaces  120 ,  130  can connect to the network via the second wireless communication unit.  
         [0036]     The second wireless communication unit can be a wireless telecom device which can be the mobile communication module with more than one communication standard. The types of the mobile communication module include GPRS, CDMA, PHS, or GSM. Therefore, the mobile communication module can be a PDA or a cell phone.  
         [0037]     The wireless network module of an embodiment of the invention is shown in  FIGS. 2 and 3 . In this embodiment, It assumes that the first and second interfaces of the wireless network module are respectively a PCMCIA interface  220  and a memory card interface  230 , that it is built in with a wireless datacom module  210 , and that it uses a CPLD  240  as the control unit to communicate the address, data and control signals between the PCMCIA interface  220 , the memory card interface  230 , and the wireless datacom module  210 . All the wireless datacom module  210 , PCMCIA interface  220 , memory card interface  230 , and CPLD  240  are installed on a body  200 .  
         [0038]     The host of a computer  202 , say a laptop computer or a personal computer, can use its interface  222  the same or compatible as the PCMCIA interface  220  to connect to the PCMCIA interface  220  on the wireless network module. Therefore, it can use the network functions of the communication standard of the first wireless communication unit via the wireless datacom module  210 . That is, it obtains the wireless networking function by the wireless datacom module  210 , as shown in  FIG. 2 .  
         [0039]     Moreover, a mobile communication device  204 , such as a PDA or cell phone, can use its interface  234  the same or compatible as the memory card interface  230  to combine with the wireless network module, thereby use the network functions of the communication standard of the wireless datacom module  210 . That is, it obtains the wireless networking function using the wireless datacom module  210  on the body  200 . The wireless communication function of a mobile communication device is thus extended by the wireless network module, as shown in  FIG. 3 .  
         [0040]     In another embodiment shown in  FIG. 4 , it assumes that the first and second interfaces of the wireless network module are, respectively, a PCMCIA interface  320  and a memory card interface  330 . The wireless network module is built in with a wireless datacom module  310 . It uses a CPLD  340  as the control unit to communicate the address, data and control signals between the PCMCIA interface  320 , the memory card interface  330 , and the wireless datacom module  310 . All the wireless datacom module  310 , PCMCIA interface  320 , memory card interface  330 , and CPLD  340  are installed on a body  300 .  
         [0041]     The host of a computer  302 , say a laptop computer or a personal computer, can use its interface  322  the same or compatible as the PCMCIA interface  320  to combine with the wireless network module, thereby it can use the network functions of the communication standard of the first wireless communication unit via the wireless datacom module  310 . That is, it obtains the wireless networking function using the wireless datacom module  310  on the body  300 .  
         [0042]     When the wireless datacom module  310  cannot provide services, it combines with an electronic device with the second wireless communication unit, i.e. an electronic device  304  with a wireless telecom module  314  such as a PDA or cell phone, by the memory card interface  330 . When the computer  302  is connected to the electronic device  304  via the network wireless module, the control unit on the body  300 , i.e. the CPLD  340 , can communicate address, data, and control signals among the PCMCIA interface  320 , the memory card interface  330 , and the wireless datacom module  310 . Thus, the computer  302  can recognize the wireless datacom module  310  and the wireless telecom module  314  and make them function independently. In other words, the computer also can obtain the wireless networking functions via the wireless telecom module  314 .  
         [0043]     Using the design of the control unit, the electronic device connected to the wireless network module preferably uses the first wireless communication unit. That is, when it detects the wireless datacom module  310  can provide the services again, the CPLD  320  on the body  300  detects the control signal sent by the wireless datacom module  310  and switches the computer  302  that originally uses the wireless telecom module  334  for networking to use the wireless datacom module  310 .  
         [0044]     The interface on the body can be a compound interface, such as a six-in-one memory card interface, to increase the compatibility with different interfaces of various electronic devices.  
         [0045]      FIG. 5  also shows a wireless network module of an embodiment of the invention that enables an electronic device to connect to a network. It includes a first wireless communication unit  410 , first and second interfaces  420 ,  430 , and a control unit  440 .  
         [0046]     Since the first wireless communication unit  410 , the first interface  420 , and the second interface  430  are the same as those in  FIG. 1 , we do not describe their configurations and functions again.  
         [0047]     The control unit  440  includes a control device  442  and a memory device  444 . The control device  442  controls the signals between the first wireless communication unit  410  and the interfaces  420 ,  430 . It can be a dispatch circuit. The memory device  444  is used to store information obtained by the electronic device via the first wireless communication unit  410 . It can be a memory device.  
         [0048]     To enhance the action of the first wireless communication unit of an embodiment of the invention, an antenna  550  can be installed on the body, as shown in  FIG. 6 . The antenna  550  can be installed at different locations on the body  500  according to practical needs.  
         [0049]     In summary, such wireless network module can be used in various kinds of electronic devices so that they can connect to a network. If it is used in a mobile communication device, such as a PDA or a cell phone, the mobile communication device obtains the wireless networking function, expanding its wireless communication functions. The wireless network module enables an electronic device to have both the wireless data communication function and the wireless telecommunication function. That is, an electronic device can use the wireless network module to connect to another electronic device with the wireless telecommunication function. In this case, the electronic device can use the wireless network module to enjoy the wireless telecommunication function by using the connected electronic device with the wireless telecommunication function.  
         [0050]     Of course, one can decide to have a built-in wireless telecommunication module in the wireless network module and to externally connect to an electronic device with a wireless network module.  
         [0051]     Moreover, a wireless network module according the invention includes a built-in memory device to store information obtained by the electronic device from the network.  
         [0052]     To enhance the function of the first wireless communication unit, an antenna can be installed on the body for the first wireless communication unit.  
         [0053]     It is thus seen that the wireless network module according the invention is not directly integrating two kinds of wireless communications functions. Instead, a flexible extension means is employed for the convenience of modifying only the communication standard that is changed. This can save a lot of the production development cost. The users do not have to keep purchasing new products in response to the changes in the wireless telecommunication or wireless data communication standards. The invention can be readily upgraded.  
         [0054]     Knowing the invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.