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Wireless data transmitting and receiving system, server device, and server device controlling method

  • US 20020073229A1
  • Filed: 10/15/2001
  • Published: 06/13/2002
  • Est. Priority Date: 10/19/2000
  • Status: Active Grant
First Claim
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1. A wireless data transmitting and receiving system having a server device connected wirelessly to a plurality of client devices constituting a wireless network, the system transmitting and receiving data in packets on a time division basis between said server device and said plurality of client devices over said wireless network;

  • wherein each of said client devices comprises;

    wireless communicating means for wirelessly transmitting and receiving data to and from said server device;

    identification data storing means for storing device identification data unique to each of the wireless devices connected wirelessly to said wireless network;

    packet evaluating means for evaluating the packets received by said wireless communicating means so as to extract from the received packets only those packets addressed to the own device based on said device identification data stored in said identification data storing means;

    encryption key storing means for storing an encryption key shared only by the devices connected to said wireless network, said encryption key being used to encrypt and decrypt the data communicated over said wireless network;

    decrypting means for decrypting the encrypted data transmitted in the packets that were received and extracted, the decryption being done by use of said encryption key stored in said encryption key storing means;

    reproducing means for reproducing the data decrypted by said decrypting means;

    operating means for inputting a command requesting said server device to transmit the data to be reproduced by said reproducing means;

    encrypting means for encrypting control data to be transmitted to said server device, the encryption being done by use of said encryption key stored in said encryption key storing means;

    packet composing means for composing said control data encrypted by said encrypting means into packets each furnished with said device identification data stored in said identification data storing means and with receiving device identification data designating said server device as the device to receive said control data; and

    controlling means which, based on said command for controlling said server device, controls said encrypting means, said packet composing means and said wireless communicating means in such a manner causing said wireless communicating means to transmit the packets for controlling said server device by way of said wireless communicating means; and

    wherein said server device comprises;

    wireless communicating means for wirelessly transmitting and receiving data in packets to and from said client devices over said wireless network;

    identification data storing means for storing first device identification data unique to each of the wireless devices connected wirelessly to said wireless network;

    packet evaluating means for evaluating the packets received by said wireless communicating means so as to extract from the received packets only those packets addressed to the own device based on said device identification data stored in said identification data storing means;

    identification data holding means for holding second device identification data for identifying the device that transmitted the extracted packets;

    encryption key storing means for storing said encryption key shared only by the devices connected to said wireless network, said encryption key being used to encrypt and decrypt the data communicated over said wireless network;

    decrypting means for decrypting the encrypted control data transmitted in the packets that were received and extracted, the decryption being done by use of said encryption key stored in said encryption key storing means;

    inputting means for inputting data destined for reproduction by said client devices;

    compressing means for compressing the reproduction-destined input data;

    encrypting means for encrypting the compressed reproduction-destined data based on said encryption key stored in said encryption key storing means;

    packet composing means for composing the encrypted reproduction-destined data into packets each furnished with said device identification data stored in said identification data storing means and with device identification data designating the wireless device receiving said encrypted reproduction-destined data; and

    controlling means which, based on the control data extracted by said packet evaluating means and decrypted by said decrypting means, causes said inputting means to input the reproduction-destined data as designated by said control data;

    causes said encrypting means to encrypt the reproduction-destined input data by use of said encryption key stored in said encryption key storing means;

    causes said packet composing means to compose packets to be transmitted, each of the composed packets being constituted by the encrypted reproduction-destined data, by said second device identification data which are held in said identification data holding means and which identify the device having transmitted said control data, and by said first device identification data which are held in said identification data storing means and which identify the device transmitting said encrypted reproduction-destined data; and

    causes said wireless communicating means to transmit the composed packets over said wireless network.

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