Method and arrangement for establishing a connection in a telecommunications system

• US 5,703,933 A
• Filed: 05/10/1996
• Issued: 12/30/1997
• Est. Priority Date: 05/31/1995
• Status: Expired due to Term

• Current Assignee: Telefonektiebolaget L M Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Ghisler, Walter
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): TIEU, BINH KIEN
• Application Number:
  US08/646,532
• Time in Patent Office: 599 Days
• Field of Search: 379/57, 379/58, 379/59, 379/60
• US Class Current: 455/422.1
• CPC Class Codes: H04W 84/14 WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Abstract

A radio-associated telecommunications network (RLL) comprises a radio base station (BS2) and a radio station (MS1) having a control unit (AD1) which serves a first subscriber apparatus (AB1). A public switched telecommunications network (PSTN) having an exchange (VX2) serves a second subscriber apparatus (AB2), this network being connected to the radio base station (BS2). As the telephone receiver of the first subscriber apparatus (AB1) is lifted, an off-hook signal (HS) is sent to the control unit (AD1). This unit delivers to the radio station (MS1) a transmission signal (S2) and an address (B2). which points to the exchange (VX2). A signalling channel (ACC) to the radio base station (BS2) is set-up and the address (B2) is sent on this channel. The radio base station (BS2) sets-up a traffic channel (TCH1) to the radio station (MS1) and establishes a connection (CON1) to the exchange (VX2) with the aid of the address (B2). The exchange (VX2) sends a dial tone (RT) to the first subscriber apparatus (AB1), over the traffic channel (TCH1). A telephone number (NR2) to the second subscriber apparatus (AB2) is now dialled on the keypad of the subscriber apparatus (AB1) and the second subscriber apparatus (AB2) transmits the telephone number to the exchange (VX2) digit by digit via the traffic channel (TCH1). The exchange establishes a second connection (CON2) to the second subscriber apparatus (AB2), sends a ring signal (RS2) and receives an off-hook signal (HS2). This initiates combining of the connections (CON1, CON2) so that the subscriber apparatus (AB1, AB2) are able to communicate via the traffic channel (TCH1).

Claims

1. A method of establishing in a telecommunications network (RLL, PSTN) a connection between a first (AB1) and a second (AB2) subscriber apparatus, wherein the telecommunications network includes:

a radio unit (RA1) which includes an essentially stationary radio station (MS1) and a control unit (AD1) connected thereto, said radio unit (RA1) being connected to the first subscriber apparatus (AB1); and

at least one radio base station (BS2) connected to a wirebound part (PSTN) of the telecommunications network;

wherein the establishment of the connection (CON1+CON2) is requested from the first subscriber apparatus (AB1) and the method comprises;

delivering a hook signal (HS) from the first subscriber apparatus (AB1) to the control unit (AD1);

signaling on a signaling channel (ACC) between the essentially stationary radio station (MS1) and the radio base station (BS2) in dependence on the hook signal (HS);

establishing a first connection (CON1) between the first subscriber apparatus (AB1) and the wirebound part (PSTN) of the telecommunications network in dependence on an order transmitted on the signaling channel, including establishing a traffic channel (TCH1) between the essentially stationary radio station (MS1) and the radio base station (BS2);

transmitting a dial tone (RT) from the wirebound part (PSTN) of the telecommunications network to the first subscriber apparatus (AB1), said transmission being effected via the traffic channel (TCH1);

transmitting a subscriber number (NR2) from the first subscriber apparatus (AB1) to the wirebound part (PSTN) of the telecommunications network, said subscriber number (NR2) belonging to the second subscriber apparatus (AB2) and being transmitted via the traffic channel (TCH1);

establishing a second connection (CON2) between the wirebound part (PSTN) of the telecommunications network and the second subscriber apparatus (AB2) in dependence on the subscriber number (NR2); and

interconnecting the two connections (CON1, CON2) in said wirebound part of the telecommunications network (PSTN).

2. A method according to claim 1, wherein the telecommunications network includes at least two radio base stations (BS2, BS21) which are connected to the wirebound part (PSTN) of the telecommunications network, wherein said method comprises:

sending from the radio station (MS21) to one of the radio base stations (BS2) a request for a traffic channel (TCH1);

indicating that the requested traffic channel (TCH1) is not available;

sending from the radio station (MS21) to an alternative one of the radio base stations (BS21) a request for an alternative traffic channel; and

allocating said alternative traffic channel (TCH2).

3. A method according to claim 1 or claim 2, wherein the radio base station (BS2) is connected to at least one exchange (VX2, VX4) in the wirebound part (PSTN, PSTN2) of the telecommunications network, and wherein said method further comprises:

reading an address (B2) from a memory (12) in response to the hook signal (HS), said address (B2) pointing out one of said exchanges (VX2, VX4);

transmitting the address (B2) through the order transmitted on the signalling channel (ACC); and

establishing a connection between the radio base station (BS2) and said exchange (VX2) in dependence on the address (B2).

4. A method according to claim 1 or claim 2 wherein the first subscriber apparatus (AB1) is equipped with a keypad (13) for tone dialing purposes, and wherein transmission of the subscriber number (NR2) over the traffic channel (TCH1) is effected digit by digit successively as the digits are keyed in the keypad (13).

9. A method according to claim 3, wherein said first subscriber apparatus (AB1) is equipped with a keypad (13) for tone dialing purposes, and wherein transmission of the subscriber number (NR2) over the traffic channel (TCH1) is effected digit by digit successively as the digits are keyed in the keypad (13).

5. An arrangement in a telecommunications network (RLL, PSTN) for establishing a connection between a first (AB1) and a second (AB2) subscriber apparatus, said telecommunications network comprising:

a radio unit (RA1) which is connected to the first subscriber apparatus (AB1);

at least one radio base station (BS2) connected to a wirebound part (PSTN) of the telecommunications network; and

an exchange (VX2) in the wirebound part of the telecommunications network (PSTN) having a code transmitter/receiver (22) and a coupling unit (20);

wherein the arrangement includes;

an essentially stationary radio station (MS1) having connected thereto a control unit (AD1) in the radio unit (RA1); and

a memory (12) in the control unit (AD1) for storing an address (B2) to the aforesaid exchange (VX2);

wherein

the control unit (AD1) is constructed to order the radio station (MS1) to signal on a signaling channel (ACC) to the radio base station (BS2) and to deliver the address (B2) to the radio station (MS1), in response to an off-hook signal (HS) from the first subscriber apparatus (AB1);

the radio base station (BS2) is constructed to establish a connection to the aforesaid exchange (VX2) in dependence on the address (B2) transmitted on the signaling channel (ACC), and to establish a traffic channel (TCH1) to the radio station (MS1) so as to complete a first connection (CON1) between the first subscriber apparatus (AB1) and the exchange (VX2);

the code-transmitter/receiver (22) is constructed to deliver to the first subscriber apparatus (AB1) a dial tone (RT) over the traffic channel (TCH1);

the first subscriber apparatus (AB1) is constructed to deliver a subscriber number (NR2) belonging to the second subscriber apparatus (AB2) when a number is dialed, said number being transmitted over said first connection (CON1); and

the coupling unit (20) in the exchange (VX2) is constructed to establish a second connection (CON2) to the second subscriber apparatus (AB2) in dependence on the subscriber number (NR2), and to connect the first connection (CON1) with the second connection (CON2) in response to an off-hook signal (HS2) from the second subscriber apparatus (AB2).

6. An arrangement according to claim 5, wherein said control unit (AD1) includes a logic unit (11) which is constructed to collect the address (B2) from the memory (12) and to deliver said address (B2) to the radio unit (MS1) together with a transmission order (S2).

7. An arrangement according to claim 5 or claim 6, wherein at least two radio base stations (BS2, BS21;

BS2A) are connected to the wirebound part of the telecommunications network (PSTN, PSTN2) and the radio station (MS1) is constructed to request a traffic channel (TCH1) from one of the base stations (BS2) and, in the event of an occupied traffic channel, to request an alternative traffic channel (TCH2) from an alternative radio base station (BS21;

BS2A) in response to a transmission order (S2) from said control unit (AD1).

8. An arrangement according to claim 5 or claim 6 wherein said first subscriber apparatus (AB1) is equipped with a tone dialing keypad (13) and the radio unit (RA1) is constructed to transmit the subscriber number (NR2) over the traffic channel (TCH1, TCH2) digit by digit successively, as the digits are keyed on the keypad (13).

10. An arrangement according to claim 7, wherein said first subscriber apparatus (AB1) is equipped with a tone dialing keypad (13) and the radio unit (RA1) is constructed to transmit the subscriber number (NR2) over the traffic channel (TCH1, TCH2) digit by digit successively, as the digits are keyed on the keypad (13).