Multiplexed transmission system for subscriber units of different types

• US 5,231,635 A
• Filed: 10/04/1991
• Issued: 07/27/1993
• Est. Priority Date: 10/09/1990
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Travers, Jean-Francois, Briand, Jacques, Guedes, Yvon
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): BLUM, RUSSELL
• Application Number:
  US07/772,897
• Time in Patent Office: 662 Days
• Field of Search: 370/95.1, 370/95.3, 370/110.1, 379/58, 379/63, 455/88, 455/89, 455/33.1
• US Class Current: 370/277
• CPC Class Codes: H04B 7/2643 using time-division multiple access [TDMA] H04B7/2615, H04B7/2618 take precedence

Abstract

A plurality of subscriber units are connected to at least two transceiver stations for exchanging information in a time division multiple access mode, in which traffic time intervals are allocated in rotation to a variable number C of channels, where C is dependent on the number and type of units to be connected. T intervals plus one control time interval form a frame, where T is mutually prime with respect to the numbers 2 through C_MAX. M frames form a superframe, where M is the lowest common multiple of the numbers 1 through C_MAX.

Claims

1. A transmission system comprising a plurality of subscriber units connected to at least two transceiver stations for exchanging information in a time-division multiplex mode, said information being transmitted in a plurality of series of T traffic time intervals which are allocated to a variable number C of channels depending on the number and type of subscriber units to be connected, characterized in that a control time interval is provided between each of said series of T time intervals, the number of channels is less than or equal to C_MAX, and in that T is a number which is mutually prime with respect to all the numbers C=2, . . . , C_MAX.

2. A system as claimed in claim 1, characterized in that each said series of T time intervals and a respective one of said control time intervals adjoining the series constitute a frame, and information is transmitted as a multi-frame having M frames, where M is the lowest common multiple of the numbers C=1, . . . , C_MAX.

3. Transmission system as claimed in one of the claim 1, comprising a first transceiver station called the base station and at least two transceiver stations called mobile stations, characterized in that the information signals are transmitted directly by the mobile stations in traffic time intervals, whereas the control information signals for setting up and terminating the communication are transmitted to and from the base station in said control time intervals.

4. Transmission system as claimed in claim 3, comprising a first transceiver station termed base station and at least two transceiver stations termed mobile stations, characterized in that the control time interval can be used for communications in the half-duplex mode, for transmitting information signals from mobile station to mobile station without the intervention of the base station, these communications being synchronized with and under the control of the base station in the same control time interval, the base station in this case managing establishing or terminating the communication and the distribution of the frequencies and time intervals.

5. Transmission system as claimed in claim 1, comprising a first transceiver station termed base station and at least two transceiver stations termed mobile stations, characterized in that the control time interval can be used for communications in the half-duplex mode for transmitting information signals from the mobile station to mobile station without the intervention of the base station, these communications being synchronized with and under the control of the base station in the same control time interval, the base station in this case managing establishing or terminating the communication and the distribution of the frequencies and time intervals.

6. Transmission system as claimed in claim 2, comprising a first transceiver stations termed mobile stations, characterized in that the control time interval can be used for communications in the half-duplex mode for transmitting information signals from the mobile station to mobile station without the intervention of the base station, these communications being synchronized with and under the control of the base station in the same control time interval, the base station in this case managing establishing or terminating the communication and the distribution of the frequencies and time intervals.

7. Transmission system as claimed in claim 2, comprising a first transceiver station called the base station and at least two transceiver stations called mobile stations, characterized in that the information signals are transmitted directly by the mobile stations in traffic time intervals, whereas the control information signals for setting up and terminating the communication are transmitted to and from the base station in said control time intervals.

8. Transmission system as claimed in claim 7, comprising a first transceiver station termed base station and at least two transceiver stations termed mobile stations, characterized in that the control time interval can be used for communications in the half-duplex mode for transmitting information signals from the mobile station to mobile station without the intervention of the base station, these communications being synchronized with and under the control of the base station in the same control time interval, the base station in this case managing establishing or terminating the communication and the distribution of the frequencies and time intervals.

9. A transmission system comprising a plurality of subscriber units connected to at least two transceiver stations for exchanging information in a time-division multiplex mode, said information being transmitted in a plurality of series of T traffic time intervals which are allocated to a variable number C of channels depending on the number and type of subscriber units to be connected,

characterized in that a control time interval is provided between each of said series of T time intervals,

the number of channels is less than or equal to C_MAX, and

each said series of T time intervals and a respective one of said control time intervals adjoining the series constitute a frame, and information is transmitted as a multi-frame having M frames, where M is the lowest common multiple of the numbers C=1, . . . , C_MAX.

10. Transmission system as claimed in claim 9, comprising a first transceiver station called the base station and at least two transceiver stations called mobile stations, characterized in that the information signals are transmitted directly by the mobile stations in traffic time intervals, whereas the control information signals for setting up and terminating the communication are transmitted to and from the base station in said control time intervals.

11. Transmission system as claimed in claim 10, comprising a first transceiver station termed base station and at least two transceiver stations termed mobile stations, characterized in that the control time interval can be used for communications in the half-duplex mode for transmitting information signals from the mobile station to mobile station without the intervention of the base station, these communications being synchronized with and under the control of the base station in the same control time interval, the base station in this case managing establishing or terminating the communication and the distribution of the frequencies and time intervals.

12. Transmission system as claimed in claim 9, comprising a first transceiver station termed base station and at least two transceiver stations termed mobile stations, characterized in that the control time interval can be used for communications in the half-duplex mode for transmitting information signals from the mobile station to mobile station without the intervention of the base station, these communications being synchronized with and under the control of the base station in the same control time interval, the base station in this case managing establishing or terminating the communication and the distribution of the frequencies and time intervals.