Abstract:
Systems and methods of coupling a wireless network to one or more wireless adapters by way of powerlines are provided. A communication device can be employed to couple a wireless macro network to one or more wireless adapters. The communication device can provide quality of service and encryption on a per wireless adapter basis. The communication device can also identify frequencies that experience interference, and are suppressed by a harmonic suppressor, and avoid these frequencies when transmitting communications over the powerlines.

Description:
BACKGROUND OF THE INVENTION 
     Service providers of wireless communication systems are continuously working on improving the wireless coverage of their respective systems. They employ techniques such as providing more base transceiver stations (BTS) within a given area, providing BTSs in areas not previously covered, and improving the performances of BTS and network equipment to reduce the probability of dropped calls and signal interference due to poor radio frequency (RF) environments. 
     Among these on-going developments is the improvement of wireless coverage inside buildings, which includes offices, dwellings and other structures. Buildings generally have an adverse effect on the RF environment of a wireless communication system. They may be constructed out of many RF affecting materials, such as grounded steel frames, that interfere with and/or reduce the signal strength of wireless communication signals inside of the building. 
     Attempts have been made at improving the wireless coverage inside buildings. One of these is to employ a repeater outside of a building and distributed antenna modules strategically placed inside of the building. Another is to employ micro-BTSs that are coupled to a mobile switching center/base station controller (MSC/BSC) or MSC. These systems typically require coaxial or twisted pair cables to be run to the location of each distributed antenna module or micro-BTS. 
     SUMMARY OF THE INVENTION 
     One problem with the afore-mentioned techniques for improving wireless coverage within buildings is that not all buildings are wired with coaxial or twisted pair cables and/or not all businesses or persons have the authority or the budget to run these cables throughout a building. Accordingly, the exemplary embodiments of the present invention overcome these and other deficiencies of conventional in-building wireless systems. 
     Exemplary embodiments provide a communication device that couples a wireless macro network to wireless adapters using powerlines. The communication device includes a wireless base station that receives communications from the wireless macro network and provides the communications to a broadband over powerline modem, which in turn provides the communications to wireless adapters using powerlines. The communication device can provide quality of service for communications on a per wireless adapter basis. Moreover, the communication device can encrypt communications with wireless adapters. Additionally, the communication device can determine frequencies that experience interference on the powerlines, and multiplex signals in such a way to avoid using such frequencies. 
     Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING FIGURES 
         FIG. 1  is a block diagram of an exemplary communication system in accordance with the present invention; and 
         FIG. 2  is a flow diagram of an exemplary method in accordance with the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       FIG. 1  is a block diagram of an exemplary communication system in accordance with the present invention. The system includes a communication device  105  coupled to a plurality of wireless adapters  190   a - 190   c  via a three-phase powerline  185 . Wireless adapters  190   a - 190   c  each provide a wireless coverage area for supporting communications with wireless devices, and each can cover a single floor of a building, part of a single floor, or more than one floor. Wireless adapters  190   a - 190   c  can be, for example, WiMAX and/or Wi-Fi-compliant, and can employ multiple-input multiple-output (MIMO) communication techniques. Although  FIG. 1  illustrates three wireless adapters, the present invention can include more or less than three wireless adapters. 
     Communication device  105  includes a broadband over powerline modem  110  that couples wireless base station  115 , via three-phase powerline  185 , to the plurality of wireless adapters  190   a - 190   c . Wireless base station  115  can, for example, receive WiMAX or CDMA communication signals from a wireless macro network (not illustrated). Communications between wireless base station  115  and a wireless macro network can occur using microwave frequencies, local multipoint distribution service (LMDS) and/or multichannel multipoint distribution server (MMDS). The signals from the wireless macro network can include voice, video and data signals, thereby providing the so-called triple play to wireless adapters  190   a - 190   c . Communication device  105  can also include an Ethernet switch  180 , which couples broadband over powerline modem  110  to an Internet Service Provider  195 . Dynamic host configuration protocol (DHCP) logic  165  can be employed for allocating IP addresses to wireless base station  115  and wireless adapters  190   a - 190   c.    
     In accordance with exemplary embodiments of the present invention, quality of service can be provided on a per wireless adapter basis, whereas quality of service is typically provided on a per wireless device basis, such as the wireless devices that communicate using wireless adapters  190   a - 190   c . Accordingly, each of wireless adapters  190   a - 190   c  can have a different subscription level, and a corresponding different quality of service level. The quality of service is provided by the present invention using medium access control (MAC) to broadband over powerline (BPL) quality of service (QoS) logic  120 , which is coupled to wireless base station  115 , and QoS logic  125 , flow control logic  130  and buffer  135 . Specifically, MAC to BPL QoS logic  120  converts the QoS from the MAC layer used by the wireless macro network (not illustrated) to the IP layer so that the QoS information can be provided to broadband over powerline modem  110 . Likewise, when communications are received by wireless base station  115  from broadband over powerline modem  110 , logic  120  converts the quality of service information from the IP layer to the MAC layer used by the wireless macro network for quality of service. 
     When broadband over powerline modem  110  receives communications from wireless base station  115  and quality of service information from logic  120 , via base station  115 , QoS logic  125  controls the quality of service of the communications using flow control logic  130  and buffer  135 . Specifically, based on the quality of service information, flow control logic  130  controls which communications are given priority and transmitted to the wireless adapters, and which communications are temporarily stored in buffer  135 . 
     Exemplary embodiments of the present invention also provide for encryption of communications over powerlines  185 . Specifically, broadband over powerline modem  110  uses encryption logic  140  to encrypt communications received from wireless base station  115  for transmission to wireless adapters  190   a - 190   c , and the wireless adapters can decrypt the communications for transmission to wireless communication devices within range of the wireless adapter. This encryption can be, for example, a public-private key encryption, token-based encryption or any other type of encryption scheme. Furthermore, this encryption is in addition to any other encryption that is provided for the communications, such as virtual private network (VPN) encryption or the like. The encryption can be, for example, greater than 152 bit encryption. 
     Exemplary embodiments of the present invention also determine which frequencies are experiencing interference on the powerlines  185 , and multiplex the communications in such a way that they avoid these frequencies. Specifically, communication device  105  includes line filters  170  coupled between broadband over power line modem  110  and wireless adapters  190   a - 190   c . Broadband over powerline modem  110  includes a processor  145  and memory  160 , and processor  145  includes frequency determination logic  150  and multiplexing (MUX) logic  155 . Processor  145  is coupled to line filters  170 , and can measure the noise of the powerlines and adjust the frequencies being filtered by the line filters. Based on these measurements, logic  150  determines which frequencies are experiencing interference on the powerlines (i.e., which frequencies are filtered by line filters  170 ), and multiplexing logic  155  multiplexes the communications so as to avoid these frequencies. 
     Broadband over powerline modem  110  can employ orthogonal frequency division multiplexing (OFDM), in which communications are spread across a number of frequencies (also commonly referred to as tones), which may or may not be contiguous. The particular frequencies employed for transmitting communications can be any frequencies available on the powerlines, which is typically between 1 MHz and 10 GHz, and the number of frequencies employed can be dependent upon the bandwidth required for the communications. Although  FIG. 1  illustrates line filters  170  being a component of communication device  105 , the line filters can be external to the communication device. 
     Processor  145  can also provide authentication functions for wireless adapters  190   a - 190   c  and wireless communication devices that use such adapters. This authentication ensures that only authorized wireless adapters are employed, and that only those wireless communication devices that are authorized to use a particular adapter use such adapter. 
     The various logic illustrated in  FIG. 1  can be implemented in a microprocessor, field programmable gate array (FPGA) and/or an application specific integrated circuit (ASIC). When implemented in a processor, the logic can be processor-executable code loaded from a memory. Although  FIG. 1  illustrates various logic as being separate components, the logic can be combined into a single component. For example, logic  125  and  130  can be implemented in processor  145 , and buffer  135  can be implemented in memory  160 . 
       FIG. 2  is a flow diagram of an exemplary method in accordance with the present invention. Initially, wireless base station  115  receives communications from a wireless macro network (step  205 ), and MAC to BPL QoS logic  120  identifies the wireless macro network quality of service information from the MAC layer of the received communications (step  210 ). The received communications and quality of service information is provided to broadband over powerline modem  110  (step  215 ). QoS logic  125  determines the quality of service associated with a wireless adapter that is the destination of the communications (step  220 ), encryption logic  140  determines the encryption information for the selected wireless adapter (step  225 ), and logic  150  selects frequencies that avoid interference (step  230 ). Broadband over powerline modem  110  then transmits the communications to a wireless adapter in accordance with determined quality of service and encryption, and multiplexes the communications to avoid those frequencies determined to be subject to interference (step  235 ). Similar processing occurs for communications received from wireless adapters  190   a - 190   c  being sent to the wireless macro network by way of wireless base station  115 . 
     The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.