Radio frequency communication network having adaptive communication parameters

• US 5,862,171 A
• Filed: 06/06/1995
• Issued: 01/19/1999
• Est. Priority Date: 11/09/1992
• Status: Expired due to Term

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Norand Corporation (Baker Hughes Company)
• Inventors: Mahany, Ronald L.
• Primary Examiner(s): Ghebretinsae, Temesghen
• Application Number:
  US08/476,550
• Time in Patent Office: 1,323 Days
• Field of Search: 375/358, 375/200, 375/202, 455/69, 455/70, 455/33.1, 455/62, 455/63, 455/134, 455/138, 455/139, 371/5.5, 380/21, 380/34
• US Class Current: 375/132
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 17/0085 using test signal generators
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 2201/7071 with dynamic control of receiver resources
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/0014 by adapting the source coding
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/04 using frequency diversity
• CPC Class Codes: H04W 28/065 using assembly or disassembly of packets
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A radio communication network includes at least one mobile transceiver unit in communication with at least one base transceiver unit that facilitates communicate with at least one host computer for storage and manipulation of data collected by bar code scanners or other data collectors associated with the mobile transceiver units. The radio network implemented by the mobile transceivers and base transceivers adapts to compensate for the wide range of operating conditions by adjusting its operating parameters. Such operating parameters include: the length and frequency of spreading codes employed in direct-sequence spread spectrum communications; hop frame lengths, coding and interleaving in frequency-hopping spread spectrum communications; the method of source encoding used; and the data packet size in a data segmentation communication scheme. The base transceiver is responsive to information contained within transmissions received from the mobile transceiver units in establishing data packet sizes as well as to the transmissions themselves. The base transceiver is also responsive to the quality of transmissions received from the mobile transceiver units in determining whether to modify current data packet sizes.

Claims

1. A communication network for collecting data, segmenting the data and communicating the data segments, comprising:

a base transceiver having transmission and reception capability;

a mobile terminal having transmission and reception capability;

said base station responsive to transmissions received from said mobile terminal by evaluating the received transmissions and selectively directing said mobile terminal to adjust the size of data segments to be transmitted; and

said base station identifying the occurrences of failed transmissions from said base station to said mobile terminal, and, based on an evaluation of such occurrences, said base station adjusts the size of data segments to be transmitted.

2. The communication network of claim 1 wherein in evaluating the transmissions from said mobile terminal, said base station considers the percentage of transmissions that have been successfully received.

3. The communication network of claim 1 wherein in evaluating the transmissions from said mobile terminal, said base station considers the signal strength of the transmissions.

4. The communication network of claim 1 wherein in evaluating the occurrences of failed transmissions to said mobile terminal, said base station uses a threshold condition which must be met before adjusting the size of data segments.

5. The communication network of claim 1 wherein said base station utilizes a threshold window in evaluating the transmissions from said mobile terminal.

6. The communication network of claim 1 wherein said mobile terminal comprises a mobile power supply.

7. A communication network for collecting data, segmenting the data and communicating the data segments, comprising:

a first transceiver;

a second transceiver;

said first transceiver responsive to transmissions received from said second transceiver by evaluating the received transmissions and selectively directing said second transceiver to adjust the size of data segments to be transmitted; and

said first transceiver identifying the occurrences of failed transmissions from said first transceiver to said second transceiver, and, based on an evaluation of such occurrences, said first transceiver adjusts the size of data segments to be transmitted.

8. The communication network of claim 7 wherein in evaluating the transmissions from said second transceiver, said first transceiver considers the percentage of transmissions that have been successfully received.

9. The communication network of claim 7 wherein in evaluating the transmissions from said second transceiver, said first transceiver considers the signal strength of the transmissions.

10. The communication network of claim 7 wherein in evaluating the occurrences of failed transmissions to said second transceiver, said first transceiver uses a threshold condition which must be met before adjusting the size of data segments.

11. The communication network of claim 7 wherein said first transceiver utilizes a threshold window in evaluating the transmissions from said second transceiver.

12. The communication network of claim 7 wherein said second transceiver comprises a battery power supply.

13. A communication network through which wireless communication occurs via a communication parameter, the communication network comprising:

a first wireless transceiver operable using the communication parameter, the communication parameter having a current setting;

a second wireless transceiver using the current setting of the communication parameter;

said first wireless transceiver responsive to transmissions received from said second wireless transceiver by evaluating the received transmissions and selectively sending to said second wireless transceiver a request to change the current setting of the communication parameter to a new setting; and

said first wireless transceiver attempting to verify that the change from the current setting to the new setting will or has been made by the second wireless transceiver by using one of the current setting or the new setting for the communication parameter, and, if that attempt fails, using the other of the current setting or the new setting for the communication parameter.

14. The communication network of claim 13 wherein the communication parameter comprises a data segment size.

15. The communication network of claim 13 wherein in evaluating the transmissions from said second wireless transceiver, said first wireless transceiver considers the percentage of transmissions that have been successfully received.

16. The communication network of claim 13 wherein in evaluating the transmissions from said second wireless transceiver, said first wireless transceiver considers the signal strength of the transmissions.

17. The communication network of claim 14 wherein in evaluating the transmissions from said second wireless transceiver, said first wireless transceiver uses a threshold condition that must be met before adjusting the data segment size.

18. The communication network of claim 13 wherein the communication parameter comprises a frequency hopping parameter.

19. The communication network of claim 13 wherein said second wireless transceiver attempts to confirm a change to the new setting using the current setting.