Frequency agile TDMA communications system

• US 5,134,615 A
• Filed: 10/05/1990
• Issued: 07/28/1992
• Est. Priority Date: 10/05/1990
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Freeburg, Thomas A., Gehardt, Willy, Ley, John
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Jung, Min
• Application Number:
  US07/593,146
• Time in Patent Office: 662 Days
• Field of Search: 370/95.1, 370/95.3, 370/104.1, 370/50, 370/29, 370/30
• US Class Current: 370/347
• CPC Class Codes: H04B 7/2615 using hybrid frequency-time division multiple access [FDMA-TDMA]
• CPC Class Codes: H04J 4/00 Combined time-division and frequency-division multiplex systems H04J13/00 takes precedence ; data transmission H04L5/26; telemetry G08C15/00

Abstract

An intelligent communcations node is capable of dynamically selecting frequency and time slot assignments for communications with remote communication devices having different communication protocols including different available frequencies and time slots in a TDMA system. A frequency agile transmitter and receiver combined with an adaptable time slot selector enables communications with remote devices utilizing different protocols. The time and frequency management capabilities of the node makes greater spectral efficiencies possible.

Claims

1. In a communications system having a node and at least first and second time division multiple access (TDMA) remote devices, the first device having a first communications protocol utilizing first frequencies and time slots, the second device having a second communications protocol utilizing second frequencies and time slots, the first protocol being different from the second protocol, the improvement in the node comprising:

means for selectively receiving signals from said first and second devices on said first and second frequencies and generating received composite data;

means for separating said received composite data into corresponding data channels in accord with said first and second time slots utilized by said first and second remote devices;

means for combining data from user data channels coupled to said node to form composite user data in accord with said first and second time slots utilized by said first and second remote devices;

means for selectively transmitting signals representing said composite user data to said first and second devices on said first and second frequencies;

means for switching receiving and transmitting frequencies used by said receiving and transmitting means so that the receiving and transmitting frequencies correspond to said transmitting and receiving frequencies used by said first and second remote devices, respectively, when signals are being communicated between said remote devices and the node.

2. The communications system according to claim 1 further comprising means for identifying time slots to be used by the first and second devices.

3. The communications system according to claim 2 further comprising means for identifying the frequencies to be used by the first and second devices.

4. The communication system according to claim 2 further comprising means for identifying the frequencies to be used by the first and second devices.

5. The communications system according to claim 1 wherein said separating means comprises a time slot selector that synchronizes the received composite data into separate data bound for separate users.

6. The communications system according to claim 1 wherein said combining means comprises a time slot selector that synchronizes data from separate users into a single stream of data corresponding in time to the first and second time slots used by the first and second remote devices.

7. In a communications system having a node and at least first and second time division multiple access (TDMA) remote devices, the first device having a first communications protocol utilizing first frequencies and time slots, the second device having a second communications protocol utilizing second frequencies and time slots, the first protocol being different from the second protocol, a node communication method comprising the steps of:

selectively receiving signals from said first and second devices on said first and second frequencies and generating received composite data;

separating said received composite data into corresponding data channels in accord with said first and second time slots utilized by said first and second remote devices;

combining data from user data channels coupled to said node to form composite user data in accord with said first and second time slots utilized by said first and second remote devices;

selectively transmitting signals representing said composite user data to said first and second devices on said first and second frequencies;

switching receiving and transmitting frequencies used by said receiving and transmitting steps so that the receiving and transmitting frequencies correspond to said transmitting and receiving frequencies used by said first and second remote devices, respectively, when signals are being communicated between said remote devices and the node.

8. The communications method according to claim 7 further comprising the step of identifying time slots to be used by the first and second devices.

9. The communications method according to claim 7 further comprising the step of identifying the frequencies to be used by the first and second devices.

10. The communications method according to claim 8 further comprising the step of identifying the frequencies to be used by the first and second devices.

11. The communications method according to claim 7 wherein said separating step comprises synchronizing the received composite data into separate data bound for separate users.

12. The communications method according to claim 7 wherein said combining step comprises synchronizing data from separate users into a single stream of data corresponding in time to the first and second time slots used by the first and second remote devices.

13. A communications node for communicating with at least first and second time division multiple access (TDMA) remote devices having different time and frequency protocols comprising:

means for selectively receiving signals from first and second remote communication devices on first and second frequencies and generating received composite data;

means for separating said received composite data into corresponding data channels in accord with first and second time slots utilized by said first and second remote devices;

means for combining data from user data channels coupled to said node to form composite user data in accord with said first and second time slots utilized by said first and second remote devices;

means for selectively transmitting signals representing said composite user data to said first and second devices on said first and second frequencies;

means for switching receiving and transmitting frequencies used by said receiving and transmitting means to correspond to said transmitting and receiving frequencies used by said first and second remote devices, respectively, when signals are being communicated between said remote devices and the node.

14. The node according to claim 13 further comprising means for identifying time slots to be used by the first and second devices.

15. The node according to claim 13 further comprising means for identifying the frequencies to be used by the first and second devices.

16. The node according to claim 14 further comprising means for identifying the frequencies to be used by the first and second devices.

17. The node according to claim 13 wherein said separating means comprises a time slot selector that synchronizes the received composite data into separate data bound for separate users.

18. The node according to claim 13 wherein said combining means comprises a time slot selector that synchronizes data from separate users into a single stream of data corresponding in time to the first and second time slots used by the first and second remote devices.