Method and apparatus for initiating communication on an assigned frequency

• US 5,239,677 A
• Filed: 07/01/1991
• Issued: 08/24/1993
• Est. Priority Date: 07/01/1991
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Jasinski, Leon
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): PHAM, CHI H
• Application Number:
  US07/724,017
• Time in Patent Office: 785 Days
• Field of Search: 455/33.1, 455/34.1, 455/34.2, 455/54.1, 455/54.2, 370/95.1, 370/95.3
• US Class Current: 455/509
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 74/0891 for synchronized access
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A portable transceiver system (100) has at least one base site (200) capable of communicating with at least one of a plurality of portable transceivers (108). The at least one base site (200) comprises communicators communicating on first and second frequencies (301, 302). The first frequency (301) comprises a plurality of sub-frequencies for communicating from the at least one base site to the plurality of portable transceivers (108), and the second frequency (302) comprises a plurality of time-slots for receiving call initiation signals from the plurality of portable transceivers (108). The at least one base site (100) further comprises a receiver (214) and a detector (218) receiving and detecting, respectively, when the call initiation signal is received from one of the plurality of portable transceivers (108), a channel assignor (220), coupled to the detector (218), allocates a frequency assignment for communicating with an initiating portable transceiver (108) on one of the plurality of sub-frequencies of the first frequency (321), and a transmitter (210) transmitting the frequency assignment to the plurality of portable transceivers (108). Each of the plurality of portable transceivers (108) comprises a portable transmitter transmitting the call initiation signal in one of the plurality of time slots to the at least one base site (200), and a receiver receiving the frequency assignment from the at least one base site (200). The at least one base site (200) uses the time related position of the time-slot as an address to communicate to the initiating portable transceiver (108).

Claims

1. A portable transceiver system having at least one base site capable of communicating with at least one of a plurality of portable transceivers, the at least one base site, comprising:

communication means for communicating on first and second frequencies, the first frequency comprising a plurality of sub-frequencies for communicating from said at least one base site to the plurality of portable transceivers, and the second frequency comprising a plurality of time-slots for receiving call initiation signals from the plurality of portable transceivers;

means for receiving and detecting when the call initiation signal is received from one of the plurality of portable transceivers;

means, coupled to the detecting means, for allocating a frequency assignment for communicating with an initiating portable transceiver on one of the plurality of sub-frequencies of the first frequency; and

means for transmitting the frequency assignment to the plurality of portable transceivers;

each of the plurality of portable transceivers, comprising;

means for transmitting the call initiation signal in one of the plurality of time slots to the at least one base site; and

means for receiving the frequency assignment from the at least one base site, the at least one base site using the time related position of the time-slot as an address for communicating to the initiating portable transceiver

2. The portable transceiver system according to claim 1 wherein the transmitting means of the communication means transmits information to the plurality of portable transceivers to enable the plurality of portable transceivers synchronizing to the portable transceiver system.

3. The portable transceiver system according to claim 1 wherein the receiving means of the communication means receives information from the plurality of portable transceivers.

4. The portable transceiver system according to claim 1 wherein the detecting means comprises a monitoring means for monitoring the call initiation sub-frequency for determining the transmission time-slot of the call initiation signal.

5. The portable transceiver system according to claim 1 wherein the allocating means comprises a means for measuring a received signal strength indicator of the plurality of sub-frequencies of the first frequency for allocating one of the plurality of the sub-frequencies for communication.

6. A portable transceiver for communicating with at least one base site, comprising:

receiving means for receiving control and message information on a first frequency comprising a plurality of sub-frequencies for communicating from at least one base site to the portable transceivers;

transmitting means for transmitting a call initiation signal on a second frequency, the second frequency comprising a plurality of time-slots for facilitating the transmission of the call initiation signal from the portable transceiver to the at least one base site, the portable transceiver assigns the time related position of the time slot in which the call initiation signal was transmitted as an address for communicating with the at least one base site;

determining means coupled to the receiving means for determining the sub-frequency of the plurality of sub-frequencies assigned by the at least one base site for communicating in response to the call initiation; and

accessing means for accessing the sub-frequency assigned for communicating with the at least one base site in response to the determining means.

7. The portable transceiver according to claim 6 wherein the receiving means comprises a synchronizing means for synchronizing said portable transceiver to the at least one base site.

8. The portable transceiver according to claim 6 wherein the determining means includes a means for decoding the sub-frequency assigned by the at least one base site.

9. In a portable transceiver system, a method for facilitating a portable transceiver initiated communication, comprising the steps of:

(a) the portable transceiver transmitting a call initiation signal on one of a plurality of time slots of a second frequency;

(b) a base site receiving the call initiation signal within one of the plurality time slots of the second frequency;

(c) the base site determining an address from the time related position of the time slot in which the call initiation signal was received; and

(d) the base site transmitting a response on a first frequency using the time related position of the time slot in which the call initiation was received as the address for allocating a frequency assignment for communicating with the portable transceiver.

10. In a portable transceiver, a method by a portable transceiver for initiating communication, comprising the steps of:

(a) receiving control information from a base site on a first frequency;

(b) transmitting a call initiation signal in a selected one of a plurality of time slots on a second frequency;

(c) receiving information from the base site on the first frequency using the time related position of the time slot as an address for decoding a frequency assignment for communication between the portable transceiver and the base site; and

(d) the portable transceiver verifying the time related position of the call initiation signal as the address to determine that the received information is being directed to the portable transceiver.