Time division multiple access radio communication system

• US 4,937,818 A
• Filed: 07/26/1989
• Issued: 06/26/1990
• Est. Priority Date: 09/21/1987
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Sonetaka, Noriyoshi
• Primary Examiner(s): Safourek, Benedict V.
• Assistant Examiner(s): Chin, Wellington
• Application Number:
  US07/385,976
• Time in Patent Office: 335 Days
• Field of Search: 370/95, 370/104, 370/94, 370/89, 370/95.3, 455/7, 455/12, 455/33, 455/31, 455/53, 455/54, 455/56, 379/56, 379/58, 379/60
• US Class Current: 370/348
• CPC Class Codes: H04B 7/2643 using time-division multiple access [TDMA] H04B7/2615, H04B7/2618 take precedence
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 76/30 Connection release
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support

Abstract

In a TDMA radio communication system consisting of a master station and a plurality of slave stations, the master station performs channel control for sending time slot assignment information to only a calling slave station in response to a time slot assignment request from a calling slave station.

The calling slave station performs transmission control. In this control, the calling slave station detects an address of a destination device from an input transmitting signal, determines a called slave station based on the detected address, adds the address of the called slave station to the input transmitting signal to form a transmission signal, and inserts the transmission signal in the assigned time slot.

Claims

1. A time division multiple access radio communication system comprising a master station, a plurality of slave stations, and a time division multiple channel connecting between said slave stations under control of said master station,

said master station comprising:

channel connection control means for receiving a channel connection request from a calling slave station, determining based on availability of said channel whether or not the channel can be assigned, and transmitting a response signal to said calling slave station by adding the determination result to the response signal;

channel control means for receiving a slot assignment request from the calling slave station and transmitting slot assignment information of said time division multiple channel to said calling slave station; and

release means for receiving a disconnection request from the calling slave station and releasing assignment of a slot assigned to the calling slave station;

each of said slave stations comprising;

channel connection request means responsive to an input calling signal received from the master station to perform the channel connection request to said master station;

slot assignment request means for receiving an acknowledge signal for the channel connection request from said master station and sending the slot assignment request to said master station;

slot detection means for detecting a slot assigned to said slave station as the calling station based on the received slot assignment information;

address detection means for detecting an address of a destination device based on an input transmitting signal received from the master station;

called station determination means for determining a called slave station based on the address of said destination device detected by said address detection means;

transmission control means for adding an address of said called slave station determined by said called station determination means to the input transmitting signal to form a transmission signal, and inserting the transmission signal into the time slot detected by said slot detection means;

reception control means for receiving the transmission signal inserted in each time slot of the time division multiple channel to detect the address of said called slave station included in each transmission signal, and fetching the transmission signal in which the address of said called slave station coincides with that of its own as a reception signal; and

completion control means for transmitting the disconnection request in response to completion of the transmission operation of said transmission control means.

2. A system according to claim 1, wherein said transmission control means of each of said calling slave stations causes an address of its own to be included in the transmission signal formed thereby.

4. A system according to claim 1, wherein step (1) includes a further step in each of said calling slave stations which causes an inclusion of a calling slave station address in the further transmission signal.

3. A method for controlling a time division multiple access radio communication system comprising a master station, a plurality of slave stations, and at least one time division multiplex channel interconnecting said slave stations under control of said master station,

said method as practiced at said master station comprising the steps of:

(a) receiving a channel connection request signal from a calling slave station;

(b) determining an availability of said requested channel depending upon whether or not the channel requested in step (a) is idle and can be assigned;

(c) transmitting a response signal to said calling slave station by adding a determination result found in step (b) response to the step (a) signal;

(d) receiving a slot assignment request from the calling slave station;

(e) transmitting to said calling slave station information relating to slot assignment on said time division multiplex channel; and

(f) releasing the slot assigned to the calling slave station in step (d) in response to a disconnection request from the calling slave station;

said method as practiced at each of said slave stations comprising the steps of;

(g) sending a channel connection request signal to said master station responsive to a receipt at said slave station of an input calling signal indicating a need for the channel connection of step (a);

(h) receiving from said master station an acknowledge signal for the channel connection request and, responsive thereto sending a slot assignment request to said master station;

(i) detecting a calling station slot assignment in the time division multiplex channel, said slot being assigned to said calling slave station based on the slot assignment information received in step (h);

(j) detecting an address in a calling slave station, and address being a destination devise based on an input transmitting signal which is originated by a calling line coupled to said calling slave station;

(k) determining an identity of a called slave station based on the address of said destination detection that occurs in step (j);

(l) adding an address of said called slave station as determined in step (k) to the input transmitting signal received in step (j) in order to form a further transmission signal;

(m) inserting the further transmission signal into the time slot detected in step (i);

(n) receiving the further transmission signal inserted in each time slot in step (m) in order to detect the address of said called slave station added in step (1) to each further transmission signal;

(o) fetching a reception signal in response to the further transmission signal in which the address of said called slave station coincides with the address of the slave station receiving the transmissions signal in step (n); and

(p) transmitting the disconnection request signal of step (f) in response to a completion of a transmission.