Radio LAN station with improved point-to-point link diagnostic capability and method of operation thereof

• US 5,612,960 A
• Filed: 12/20/1991
• Issued: 03/18/1997
• Est. Priority Date: 12/20/1991
• Status: Expired due to Term

• Current Assignee: Teledata Sound LLC (Intellectual Ventures LLC)
• Original Assignee: NCR Corporation
• Inventors: van der Kuil, Adrianus C., Stevens, Henricus J. M.
• Primary Examiner(s): Beausoliel, Jr., Robert W.
• Assistant Examiner(s): Elmore, Stephen C.
• Application Number:
  US07/810,749
• Time in Patent Office: 1,915 Days
• Field of Search: 371/20.1, 371/20.4, 371/20.5, 371/68.2, 379/5, 370/15
• US Class Current: 714/712
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A wireless radio local area network is provided including a host station and one or more remote stations. When a diagnostic link is established between two stations in the network, diagnostic information with respect to the integrity of the link is collected. Each of the network stations engaging in diagnostic activity transmits a special diagnostic frame including a diagnostic network identification designator (NWID) code to the other stations in the network. For example, the host station transmits a diagnostic frame including the diagnostic NWID code. The host station then listens for other remote stations with the same diagnostic NWID code to transmit their diagnostic frames. The host station, which is the receiving station in this example, is capable of determining if any of the received diagnostic frames from the other remote stations exhibit the same diagnostic NWID code as the host station. The host station monitors the signal quality of those diagnostic frames received from a particular other remote station which are determined to exhibit the same NWID code as the diagnostic frames transmitted by the host station. Each station in the LAN is desirably equipped with the described diagnostics/signal quality monitoring capability. In this manner, signal quality information with respect to the radio link formed between a particular remote station and a station such as the host station is derived.

Claims

1. A radio local area network host station comprising:

transmitting means for transmitting diagnostic frames including a diagnostic network identification designator (NWID) code via a radio link to remote stations which are remote from said host station;

receiving means for receiving diagnostic frames via said radio link from said remote stations;

determining means, coupled to said receiving means, for determining if any of the frames received from said remote stations exhibit the same diagnostic NWID code as said host station; and

monitoring means, coupled to said receiving means, for monitoring those frames received from a particular remote station which are determined by said determining means to exhibit the same diagnostic NWID code as the diagnostic frames transmitted by said host station, said monitoring means thus deriving signal quality characteristics for those frames received from said particular remote station and link quality information with respect to the radio link between said particular remote station and said host station.

2. The local area network station of claim 1 further comprising first counting means for counting the number of frames received from said remote stations which exhibit an NWID code which is the same as the NWID code of said host station thus producing an equal NWID count.

3. The local area network station of claim 1 further comprising second counting means for counting the number of frames received from said remote stations which exhibit an NWID code which is not the same as the NWID code of said host station thus producing a non-equal NWID count.

4. The local area network station of claim 2 further comprising a first memory for storing said equal NWID count.

5. The local area network station of claim 3 further comprising a second memory for storing said non-equal NWID count.

6. The local area network station of claim 1 further comprising a memory for storing said link quality information.

7. The local area network station of claim 1 further comprising means for transmitting said link quality information to said particular remote station.

8. A local area network including a plurality of stations communicating over a wireless radio transmission channel, said network comprising:

a plurality of remote stations which transmit diagnostic frames including diagnostic network identification (NWID) codes;

a host station which transmits diagnostic frames including a diagnostic NWID code via a radio link to said plurality of remote stations and which receives diagnostic frames transmitted by said remote stations via said radio link, said host station including;

determining means for determining if any of the diagnostic frames received from said remote station exhibit the same diagnostic NWID code as said host station; and

monitoring means for monitoring those frames received from a particular remote station which are determined by said determining means to exhibit the same diagnostic NWID code as the diagnostic frames transmitted by said host station, said monitoring means thus deriving signal quality characteristics for those frames received from said particular remote station and link quality information with respect to the radio link between said particular remote station and said host station.

9. The local area network of claim 8 wherein said host station further comprises first counting means for counting the number of diagnostic frames received from said remote stations which exhibit a diagnostic NWID code which is the same as the diagnostic NWID code of said host station thus producing an equal NWID count.

10. The local area network of claim 8 wherein said host station further comprises second counting means for counting the number of frames received from said remote stations which exhibit a NWID code which is not the same as the NWID code of said host station thus producing a non-equal NWID count.

11. The local area network of claim 9 wherein said host station further comprises a first memory for storing said equal NWID count.

12. The local area network of claim 10 wherein said host station further comprises a second memory for storing said non-equal NWID count.

13. The local area network of claim 8 wherein said host station further comprises a memory for storing said link quality information.

14. The local area network of claim 8 wherein said host station further comprises means for transmitting said link quality information to said particular remote station.

15. A local area network including a plurality of stations communicating over a wireless radio transmission channel, said network comprising:

a host station having a host source address associated therewith;

a plurality of remote stations each having a remote source address associated therewith;

said host station including host broadcast means for transmitting a broadcast diagnostic frame including a broadcast destination address, said host source address and a diagnostic NWID code to said plurality of remote stations;

said remote stations each including remote receiving means for receiving diagnostic frames and remote transmitting means for transmitting diagnostic frames;

said host station further including host receiving means for receiving diagnostic frames from said remote stations thus producing host received diagnostic frames;

said host station further including determining means for determining if a particular host received diagnostic frame exhibits the same diagnostic NWID code as the diagnostic NWID code of said host station; and

said host station further including monitoring means for monitoring the signal quality characteristics of those host received diagnostic frames from said remote station that exhibit the same diagnostic NWID code as said host station.

16. The local area network of claim 15 wherein said host station includes a memory for storing reception quality data indicative of said signal quality characteristics.

17. The local area network of claim 16 wherein said host station further comprises means for transmitting a responsive diagnostic frame including said reception quality data to a remote station when said host station determines that the diagnostic NWID code of said remote station is the same as the diagnostic NWID code of said host station.

18. A method for collecting diagnostic information with respect to the quality of communications between a host station and a remote station in a radio local area network, said method comprising the steps of:

broadcasting, by said host station, a diagnostic frame, said diagnostic frame including a destination address, a host source address and a diagnostic network identification (NWID) code;

transmitting, by said remote station, a diagnostic frame;

receiving, by said host station, a diagnostic frame from said remote station thus producing a received diagnostic frame;

determining, by said host station, if a particular received diagnostic frame exhibits the same diagnostic NWID code as the diagnostic NWID code of said host station; and

monitoring, by said host station, of signal quality characteristics of those diagnostic frames from said remote station that exhibit the same diagnostic NWID code as said host station.

19. The method of claim 18 further comprising the step of transmitting, by said host station to said remote station, a diagnostic frame including reception quality data indicative of said signal quality characteristics if in said determining step said received diagnostic frame exhibits the same diagnostic NWID code as said host station.

20. The method of claim 19 wherein the source address of said received diagnostic frame is used as the destination address of the diagnostic frame transmitted in the step of claim 19.

21. The method of claim 18 further comprising the step of counting, by said host station, of the number of received frames which exhibit the same NWID code as said host station, thus producing an equal NWID count.

22. The method of claim 18 further comprising the step of counting, by said host station, of the number of received frames which exhibit the same NWID code as said host station, thus producing a non-equal NWID count.

23. A method for collecting diagnostic information with respect to the quality of communications between a host station and a remote station in a radio local area network, said method comprising the steps of:

broadcasting, by said host station, of a diagnostic frame including a broadcast destination address, a host source address and a diagnostic network identification (NWID) code;

transmitting, by said remote station, of a diagnostic frame including a broadcast destination address, a remote source address and a diagnostic NWID code;

receiving, by said host station, of diagnostic frame transmissions from said remote station thus producing received diagnostic frames;

determining, by said host station, if a particular received diagnostic frame exhibits the same diagnostic NWID code as said host station;

monitoring, by said host station, of signal quality characteristics of those received diagnostic frames exhibiting a diagnostic NWID code equal to the diagnostic NWID code of said host station;

storing, by said host station, of reception quality data indicative of said signal quality characteristics; and

transmitting, by said host station, of a responsive diagnostic frame including said reception quality data and using the source address of said received diagnostic frame as the destination address of said responsive diagnostic frame if in said determining step said received diagnostic frame exhibits the same unique diagnostic NWID code as said host station.

24. A method for collecting diagnostic information with respect to the quality of communications between a host station and a remote station in a radio local area network, said method comprising the steps of:

activating a point to point diagnostics mode on said host station and said remote station;

broadcasting, by said host station, of a diagnostic frame including a broadcast destination address, a host source address and a first diagnostic network identification (NWID) code;

transmitting, by said remote station, of a diagnostic frame including a broadcast destination address, a remote source address and a diagnostic NWID code;

receiving, by said host station, of diagnostic frame transmissions from said remote station thus producing received diagnostic frames;

determining, by said host station, if a particular received diagnostic frame includes a diagnostic NWID code equivalent to said first diagnostic NWID code;

counting, by said host station, received frames which exhibit the same NWID code as said host station thus producing an equal NWID count;

counting, by said host station, of received frames which do not exhibit the same NWID code as said host station thus producing a non-equal NWID count;

storing said equal and non-equal NWID counts in respective registers;

monitoring, by said host station, of signal quality characteristics of those received diagnostic frames exhibiting a diagnostic NWID code equal to the diagnostic NWID code of said host station;

storing, by said host station, of reception quality data indicative of said signal quality characteristics; and

transmitting, by said host station, of a responsive diagnostic frame including said reception quality data and using the remote source address of a received diagnostic frame as the broadcast destination address of said responsive diagnostic frame if said received diagnostic frame includes a diagnostic NWID code equivalent to said first diagnostic NWID code.