TDMA messaging service microcell

• US 7,012,903 B1
• Filed: 10/09/1998
• Issued: 03/14/2006
• Est. Priority Date: 06/28/1996
• Status: Expired due to Fees

• Current Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Original Assignee: Cingular Wireless II LLC (AT&T, Inc.)
• Inventors: Amin, Umesh J., Buhrmann, Michael
• Primary Examiner(s): Nguyen, Steven
• Assistant Examiner(s): SHAND, ROBERTA A
• Application Number:
  US09/168,919
• Time in Patent Office: 2,713 Days
• Field of Search: 370/328, 370/329, 370/336, 370/337, 370/345, 370/347, 370/313, 370/314, 455/507, 455/509, 455/511, 455/512, 455/515, 455/517, 455/31.1, 455/444, 455/446, 455/450, 455/466
• US Class Current: 370/329
• CPC Class Codes: H04W 4/14 Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]

Abstract

A cellular messaging network includes a switching controller connected to the wireless telephone network. One or more base station micro/picocell retransmitters are coupled to the switching controller. The base station micro/picocell transmitter uses simplified control equipment having no digital traffic channel capability. Each base station micro/picocell retransmitter is able to discriminate between voice channel assignment signals and short messaging signals in the digital control channel, discard the voice channel assignment signals, and rebroadcast the short messaging signals in the digital control channel. One or more receivers are coupled to the base station micro/picocell retransmitters by way of an IS-136 protocol digital control channel. The base station micro/picocell retransmitter can be connected to the switching controller through a twisted-pair telephone line.

Claims

1. A method of signal processing to determine a message in a multiplexed digital signal, the multiplexed digital signal including a voice channel assignment subchannel for voice channel assignment signals, and a short messaging subchannel for short messaging signals, the method comprising the following steps:

(A) receiving the multiplexed digital signal;

(B) demultiplexing the multiplexed digital signal to generate a short messaging signal and a voice channel assignment signal;

(C) screening the voice channel assignment signal from further processing; and

(D) decoding the short messaging signal to obtain the message.

2. The method of claim 1, wherein:

the multiplexed digital signal is presented in a TDMA format.

3. The method of claim 1, wherein:

the voice channel assignment subchannel and the short messaging subchannel are time-division multiplexed in the digital signal.

4. The method of claim 1, wherein:

the multiplexed signal includes a series of one or more frames.

16. The method of claim 3, wherein:

the multiplexed signal includes a series of one or more frames.

5. A method of receiving a message on a digital control channel for use in a cellular messaging network, comprising the steps of:

(A) receiving voice channel assignment signals related to the assignment of voice channels and short messaging signals based on the message from the digital control channel;

(B) distinguishing between the voice channel assignment signals and the short messaging signals;

(C) discarding the voice channel assignment signals; and

(D) decoding the short messaging signals to obtain the at least one message.

6. The method of claim 5, wherein:

the voice channel assignment signals and the short messaging signals are time-division multiplexed in the digital control channel.

7. The method of claim 5, wherein step (A) comprises the step of:

demultiplexing the digital control channel.

8. The method of claim 5, further comprising the step of:

paging a receiver in the cellular messaging network using the short messaging signals.

12. The method of claim 5, further comprising the step of:

paging a receiver in the cellular messaging network using the short messaging signals.

9. A method of receiving at least one message on a digital control channel for use in a cellular messaging network, comprising the steps of:

(A) receiving voice channel assignment signals related to the assignment of voice channels and short messaging signals based on the message from the digital control channel;

(B) distinguishing between the voice channel assignment signals and the short messaging signals;

(C) discarding the voice channel assignment signals; and

(D) rebroadcasting the short message signals.

10. The method of claim 9, wherein:

the voice channel assignment signals and the short messaging signals are time-division multiplexed in the digital control channel.

11. The method of claim 9, wherein step (A) comprises the step of:

demultiplexing the digital control channel.

13. A method of signal processing to determine a message in a multiplexed digital signal, the multiplexed digital signal including a voice channel assignment subchannel for voice channel assignment signals, and a short messaging subchannel for short messaging signals, the method comprising the following steps:

(A) receiving the multiplexed digital signal;

(B) demultiplexing the multiplexed digital signal to generate a short messaging signal and a voice channel assignment signal;

(C) screening the voice channel assignment signal from further processing; and

(D) rebroadcasting the short messaging signal.

14. The method of claim 13, wherein:

the multiplexed digital signal is presented in a TDMA format.

15. The method of claim 13, wherein:

the voice channel assignment subchannel and the short messaging subchannel are time-division multiplexed in the digital signal.