Control method of data transmission for the multiplexing bus system network and wireless network

• US 6,034,966 A
• Filed: 10/18/1996
• Issued: 03/07/2000
• Est. Priority Date: 10/20/1995
• Status: Expired due to Fees

• Current Assignee: Fuji Xerox Company Limited (Xerox Holdings Corp.)
• Original Assignee: Fuji Xerox Company Limited (Xerox Holdings Corp.)
• Inventors: Ota, Takeshi
• Primary Examiner(s): Patel, Ajit
• Assistant Examiner(s): Pizarro, Ricardo M.
• Application Number:
  US08/733,601
• Time in Patent Office: 1,236 Days
• Field of Search: 359/118, 359/121, 359/123, 359/135, 359/136, 370/443, 370/445, 370/441, 370/431, 370/432
• US Class Current: 370/443
• CPC Class Codes: H04B 7/2643 using time-division multiple access [TDMA] H04B7/2615, H04B7/2618 take precedence

Abstract

An improved transmission control method for use in a network which includes a time division multiplexing channel and a contention control channel. At least one station and a central control unit are connected both to a contention control channel and a time division multiplexing (TDMA) channel. When a station starts a time division multiplexing session, it transmits an access request to the central control unit via the contention control channel. After the central control unit receives the access request, the station which transmitted the access request is included in the order of the time division multiplexing (TDMA). The central control unit repeatedly transmits a transmission permitting token to the station via the TDMA channel in accordance with the order of the time division multiplexing. The station which received the transmission permitting token transmits the data entity, if existing, to either the other station or the central control unit via the second communication channel, and also transmits a transmission terminating token to the central control unit via the second communication channel. When the central control unit receives the transmission terminating token, it transmits the transmission permitting token via the second communication channel to the next station in the order of the time division multiplexing.

Claims

1. In a wireless network including 1) at least one station which is capable of communicating via both a first communication channel employing a spread spectrum using a first diffusion code and a contention control communication protocol and a second communication channel employing a time division multiplexing communication protocol, and 2) time division multiplexing control means which employs spread spectrum using a second diffusion code and is capable of communicating via both said first communication channel and said second communication channel, and of controlling a data transmission on said second communication channel in accordance with an order of a time division multiplexing, a method for controlling a data transmission of the network, comprising the steps of:

transmitting an access request from a first station of said at least one station to said time division multiplexing control means via said first communication channel employing spread spectrum using a first diffusion code when the first station begins a time division multiplexing session to transmit at least one data entity to either an other station or said time division multiplexing control means which employs spread spectrum using a second diffusion code via said second communication channel;

including the first station which transmitted the access request in the order of the time division multiplexing after said time division multiplexing control means received the access request;

repeatedly transmitting a transmission permitting token, which permits the first station to use said second communication channel, from said time division multiplexing control means to the first station which transmitted the access request, via said second communication channel, in accordance with the order of the time division multiplexing;

transmitting the at least one data entity if existing, from the first station which received the transmission permitting token to either the other station or said time division multiplexing control means via said second communication channel;

transmitting a transmission terminating token for every at least one data entity, which represents an end of the transmission of the at least one data entity, from the first station which received the transmission permitting token to said time division multiplexing control means via said second communication channel; and

transmitting the transmission permitting token via said second communication channel, from said time division multiplexing control means to a second station in the order of the time division multiplexing when said time division multiplexing control means receives the transmission terminating token.

2. In a wireless multiplexing bus system network comprising 1) a first bus employing a spread spectrum using a first diffusion code and a contention control protocol, 2) a second bus employing a time division multiplexing protocol, 3) at least one station connected to both said first bus and said second bus, and 4) a time division multiplexing controller which is connected to both said first bus and said second bus, and employs spread spectrum using a second diffusion code and is capable of controlling a data transmission on said second bus in accordance with an order of a time division multiplexing, a method for controlling a data transmission of the network, comprising the steps of:

transmitting an access request from a first station of said at least one station to said time division multiplexing controller via said first bus employing a spread spectrum using a first diffusion code when the first station begins a time division multiplexing session to transmit at least one data entity to either an other station or said time division multiplexing controller which employs spread spectrum using a second diffusion code via said second bus;

including the first station which transmitted the access request in the order of the time division multiplexing after said time division multiplexing controller received the access request;

repeatedly transmitting a transmission permitting token, which permits the first station to use said second bus, from said time division multiplexing controller to the first station which transmitted the access request, via said second bus, in accordance with the order of the time division multiplexing;

transmitting the at least one data entity if existing, from the first station which received the transmission permitting token to either the other station or said time division multiplexing controller via said second bus;

transmitting a transmission terminating token for every at least one data entity, which represents an end of the transmission of the at least one data entity, from the first station which received the transmission permitting token to said time division multiplexing controller via said second bus; and

transmitting the transmission permitting token via said second bus, from said time division multiplexing controller to a second station in the order of the time division multiplexing when said time division multiplexing controller receives the transmission terminating token.

3. The method of claim 2, further comprising the steps of transmitting a session end token, which represents the end of the time division multiplexing session, from the first station running the time division multiplexing session to said time division multiplexing controller via said second bus when the first station ends the time division multiplexing session;

and

removing said first station which transmitted the session end token from the order of the time division multiplexing, after said time division multiplexing controller received the session end token.

4. The method of claim 2, further comprising the step of:

transmitting the transmission permitting token via said second bus, from said time division multiplexing controller to the second station in the order of the time division multiplexing, when said time division multiplexing controller does not receive the transmission terminating token from the first station to which the transmission permitting token was previously transmitted, after a predetermined time period passed.

5. In a multiplexing bus system network comprising 1) a first bus employing a contention control protocol, 2) a second bus employing a time division multiplexing protocol, 3) a plurality of stations connected to both said first bus and said second bus, and 4) a time division multiplexing controller connected to both said first bus and said second bus, for controlling a data transmission on said second bus in accordance with an order of a time division multiplexing, a method for controlling a data transmission of the network, comprising the steps of:

transmitting an access request from a first station of the plurality of stations to said time division multiplexing controller via said first bus when the first station begins a time division multiplexing session to carry out a multicast transmission, which is a simultaneous transmission of a data entity from the first station to other stations among the plurality of stations via said second bus;

including the first station which transmitted the access request in the order of the time division multiplexing after said time division multiplexing controller received the access request;

repeatedly transmitting a transmission permitting token, which permits the first station to use said second bus, from said time division multiplexing controller to the first station which transmitted the access request, via said second bus, in accordance with the order of the time division multiplexing;

sending out a multicast information, which is a data entity having no address, from the first station which received the transmission permitting token, onto said second bus; and

communicating a control information for carrying out the multicast transmission via said first bus among the first station to send out the multicast information and the other stations to receive the multicast information.

6. The method of claim 5, wherein:

said step of communicating the control information includes a substep of transmitting a request for the multicast information as the control information from the other stations which are to receive the multicast information to the first station which is to send out the multicast information via the first bus; and

said step of transmitting the access request is carried out when the first station receives the request of the multicast information.

7. The method of claim 5, wherein:

said step of communicating the control information includes substeps of transmitting a request for the multicast information as the control information from the other stations which are to receive the multicast information to the first station which is to send out the multicast information via the first bus,

detecting whether or not the multicast information has already been sent out onto the second bus when the first station receives the request of the multicast information, and

transmitting, if the multicast information has already been sent out, the control information indicating that the multicast information has already been sent out from the first station to the other stations.

8. In a wireless network including 1) at least one child station which is capable of communicating via both a first communication channel employing spread spectrum using a first frequency and a contention control communication protocol and a second communication channel which employs spread spectrum using a second frequency and a time division multiplexing communication protocol, and 2) a base station which is capable of communicating via both said first communication channel and said second communication channel, and of controlling a transmission on said second communication channel in accordance with an order of a time division multiplexing, a method for controlling a data transmission of the network, comprising the steps of:

transmitting an access request from a first child station of said at least one child station to said base station via said first communication channel employing spread spectrum using a first frequency when the first child station begins a time division multiplexing session to transmit at least one data entity to either an other child station or the base station via said second communication channel which employs spread spectrum using a second frequency;

including the first child station which transmitted the access request in the order of the time division multiplexing after said base station received the access request;

repeatedly transmitting a transmission permitting token, which permits the first child station to use said second communication channel, from said base station to the first child station which transmitted the access request, via said second communication channel, in accordance with the order of the time division multiplexing;

transmitting the at least one data entity if existing, from the first child station which received the transmission permitting token, to either the other child station or said base station via said second communication channel;

transmitting a transmission terminating token for every at least one data entity, which represents an end of the transmission of the at least one data entity, from the first child station which received the transmission permitting token to said base station via said second communication channel; and

transmitting the transmission permitting token via said second communication channel, from said base station to a second child station in the order of the time division multiplexing when said base station receives the transmission terminating token.

9. In a wireless network comprising 1) at least one child station which is capable of communicating via both a first communication channel which employs spread spectrum using a first diffusion code and a contention control communication protocol, and a second communication channel which employs spread spectrum using a second diffusion code and a time division multiplexing communication protocol, and 2) a base station which is capable of communicating via both said first communication channel and said second communication channel, and of controlling transmission on said second communication channel in accordance with an order of a time division multiplexing, a method for controlling a data transmission of the network, comprising the steps of:

transmitting an access request from a first child station of said at least one child station to said base station via said first communication channel which employs spread spectrum using a first diffusion code when the first child station begins a time division multiplexing session to transmit a data entity to either another child station or the base station via said second communication channel which employs spread spectrum using a second diffusion code;

including the first child station which transmitted the access request in the order of the time division multiplexing after said base station received the access request;

repeatedly transmitting a transmission permitting token, which permits the first child station to use said second communication channel, from said base station to the first child station which transmitted the access request, via said second communication channel, in accordance with the order of the time division multiplexing;

transmitting the data entity if existing, from the first child station which received the transmission permitting token, to either the other child station or said base station via said second communication channel;

transmitting a transmission terminating token, which represents an end of the transmission of the data entity, from the first child station which received the transmission permitting token to said base station via said second communication channel; and

transmitting the transmission permitting token via said second communication channel, from said base station to a second child station in the order of the time division multiplexing when said base station receives the transmission terminating token.

10. A method for controlling transmissions of stations which communicate via both a first channel employing spread spectrum using a first diffusion code and a contention control protocol and a second channel employing spread spectrum using a second diffusion code and a time division multiplexing protocol, comprising:

transmitting an access request from a first station to a time division multiplexing controller via the first channel employing spread spectrum using a first diffusion code;

including the first station in an order of a time division multiplexing in response to the access request;

transmitting a transmission permitting token via the second channel employing spread spectrum using a second diffusion code from the time division multiplexing controller to the first station which permits the first station to use the second channel;

transmitting communication signals representing data entities from the first station to an other station or to the time division multiplexing controller via the second channel; and

transmitting a transmission terminating token for every data entity from the first station to the time division multiplexing controller via the second channel, the transmission terminating token representing an end of the communication signals.

11. The method according to claim 10, further comprising:

transmitting a transmission terminating token from the first station to the time division multiplexing controller via the second channel when there is no data entity transmitted.

12. A method for controlling transmissions of stations which communicate via both a first channel employing spread spectrum using a first diffusion code and a contention control protocol and a second channel employing spread spectrum using a second diffusion code and a time division multiplexing protocol, comprising:

transmitting an access request from a first station to a time division multiplexing controller via a first channel employing spread spectrum using a first diffusion code;

including the first station in an order of a time division multiplexing in response to the access request;

transmitting a transmission permitting token via the second channel employing spread spectrum using a second diffusion code from the time division multiplexing controller to the first station which allocates a time slot for the first station to use on the second channel;

transmitting communication signals from the first station to an other station or to the time division multiplexing controller via the second channel; and

transmitting a transmission terminating token for every time slot from the first station to the time division multiplexing controller via the second channel, the transmission terminating token representing an end of the time slot.