Wireless desktop area network system

• US 6,343,071 B1
• Filed: 07/10/1997
• Issued: 01/29/2002
• Est. Priority Date: 01/11/1995
• Status: Expired due to Term

• Current Assignee: Sipor Communication Technology, LLC
• Original Assignee: Cypress Semiconductor Corporation (Infineon Technologies AG)
• Inventors: Lansford, James L
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): Nguyen, Phuongchau Ba
• Application Number:
  US08/875,697
• Time in Patent Office: 1,664 Days
• Field of Search: 370/338, 370/445, 370/447, 370/448, 370/461, 370/462
• US Class Current: 370/338
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 2001/0094 Bus
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 74/0825 with collision detection
• CPC Class Codes: H04W 84/10 Small scale networks; Flat hierarchical networks
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

A wireless communication system for receiving and transmitting serial bus data packets in conformance with a CSMA/CA protocol implemented in an ACCESS.bus serial bus data protocol which may accommodate either RF or IR transmissions for peer-to-peer communications between computers and between peripherals, as well as computer-to-peripheral and peripheral-to-computer communications.

Claims

1. A method of transmitting and receiving serial bus data packets between computers, between computers and peripherals, and between peripherals in a broadband, wireless DAN network having multiple nodes, which comprises the steps of:

formatting said data packets by a transmitting node to conform with a CSMA/CA multiple access control protocol;

inserting data timing information in preambles of said data packets by said transmitting node for synchronizing the transfer of said data packets to a receiving node of said multiple nodes;

adding error check information at the end of said data packets by said transmitting node to allow data validation by said receiving node;

modulating said data packets by said transmitting node for transmission to said receiving node;

transmitting said data packets to said receiving node if said transmitting node detects no transmission signals in a transmission channel of said wireless DAN network, and delaying transmission of said data packets until said transmission channel is idle if said transmitting node detects transmission signals in said transmission channel;

upon receipt of said data packets by said receiving node, demodulating said data packets and sampling said data timing information by said receiving node to synchronize a reading of data;

detecting said error check information at said receiving node to determine whether an error free transmission of said data packets has occurred, and issuing an acknowledgment signal by said receiving node to said transmitting node in the event of said error free transmission; and

retransmitting said data packets by said transmitting node after a delay in time proportional to a network address of said transmitting node if said acknowledgment signal is not received by said transmitting node within a wait time period.

2. The method set forth in claim 1 wherein said CSMA/CA multiple access control protocol is implemented in an ACCESS.bus data packet protocol.

3. The method set forth in claim 1, wherein said wireless DAN network system is an RF system.

4. The method set forth in claim 1, wherein said wireless DAN network system is an IR system.

5. The method set forth in claim 1, further including the following network configuration steps of said transmitting node:

detecting the presence of a wireless network module in said transmitting node;

upon detection of said wireless network module, identifying a set of said multiple nodes including said transmitting node which have wireless network modules;

selecting from said set a group of said multiple nodes to form a desired network configuration; and

inserting a network address of said receiving node of said group in said data packets prior to a transmission to said receiving node.

6. A network node system in a broadband, wireless DAN network of multiple nodes for receiving and transmitting information between computers, between computers and peripherals, and between peripherals in serial bus data packets, which comprises:

interface means for alternatively irradiating and receiving modulated information signals formatted in conformance with a CSMA/CA and wired serial bus data packet protocol;

transmitter means in electrical communication with said interface means for modulating first information signals and thereafter supplying first modulated information signals to said interface means to initiate a transmission to a receiving node of said multiple nodes;

receiver means in electrical communication with said interface means for receiving second modulated information signals of a transmitting one of said multiple nodes, for demodulating said second modulated information signals, for sampling an alternating data stream in preambles of demodulated second information signals to synchronize data transfers, and for receiving an acknowledgment signal from said receiving node;

control means in electrical communication with said transmitter means, said receiver means and said interface means for placing said network node system in either a transmit or a receive mode, for inserting an alternating data stream into preambles of said first information signals during a transmission mode, for detecting transmission signals in a transmission channel of said wireless DAN network, for transmitting said first modulated information signals if said transmission channel is idle, for delaying transmission of said first modulated information signals until said transmission channel is idle in the event said transmission signals are detected, and for initiating a retransmission of said first modulated information signals after a first time delay numerically proportional to a network address of said network node system if an acknowledgment signal is not received from said receiving node within a second time delay; and

a host system in electrical communication with said control means and including means for supplying said first information signals to said transmitting means and requesting a transmission of said first information signals to said receiving node, and for receiving said second information signals from said receiver means for further processing.

7. The network node system set forth in claim 6, wherein said CSMA/CA multiple access protocol is implemented in an ACCESS-bus data packet protocol.

8. The network node system set forth in claim 6, wherein said network node system is an RF system.

9. The network node system set forth in claim 6, wherein said network node system is an IR system.

10. The network node system set forth in claim 9, wherein said transmitter means applies amplitude shift keying modulation to encode said first information signals.

11. The network node system set forth in claim 8, wherein said transmitter means applies continuous phase modulation to a frequency shifting carrier to encode said first information signals.

12. The network node system set forth in claim 6, wherein a subsystem comprised of said interface means, said transmitter means, said receiver means and said control means is portable from host system to host system in said wireless DAN network.

13. The network node system set forth in claim 6, wherein said host system further includes means for detecting the presence of a wireless network module in said network node system, interactive user means for selecting a set of said multiple nodes having wireless network modules to form a desired network configuration, and memory means for storing network addresses and interconnections of said set for automated access in transmitting said first modulated information signals to said receiving node in said desired network configuration.