TH43785A - High-energy short message service using TDMA frames and/or distributed control channels. - Google Patents

Abstract

DC60 (12/11/42) Methods and systems for transmitting short data messages in TDMA communication systems. In a controlled station, a selected TDMA frame is assigned as a message frame and one or more data channels. From each message frame, one or more channels are assigned to the transmitter/receiver. Data messages can be encoded and transmitted multiple times at higher power levels from the control station to the transmitter/receiver via the good data channel in each message frame. The selected TDMA frame in good form is then a frame of the slow common control channel. Similarly, short character and numeric messages can be transmitted through the broadcast control channel of a digital radio junction or another communication channel consisting of one or more channels from contiguous frames in a TDMA junction. Increased transmission power is used in conjunction with repeaters to increase the effective signal range without the complications of mobile unit design, large delays, or interchannel interference where higher signal range is required. When longer messages are required, or for voice messages, the message itself may be stored, and the mobile unit will be notified of the message. Methods and systems for sending short data messages in a TDMA communication system: In a controlled station, the selected TDMA frame is assigned as a message frame, and one or more data channels from each message frame are assigned to the transmitter/receiver. Data messages can be encoded and transmitted multiple times at higher power levels from the control station to the transmitter/receiver via the data good channel in each message frame. The selected TDMA frame in good form is then a frame of the slow common control channel. Similarly, short character and numeric messages can be transmitted through the broadcast control channel of a digital radio junction or another communication channel consisting of one or more channels from contiguous frames in a TDMA junction. Increasing the transmission power is used in conjunction with repeaters to increase the effective signal range without the complications of mobile unit design, significant latency, or interchannel interference where higher signal range is required. And when longer messages are needed, or for voice messages, the text may be stored, and the mobile unit will be notified of the message.

Claims (18)

1. The method for sending short message service (SMS) data messages over a TDMA communication channel consists of a series of frames, each containing several subsets of frames which are control channel frames carrying control channel information at the first signal tolerance. The method comprises: - encoding the SMS data message to create an encrypted data message; and - transmitting the encrypted data message over a message channel at a second signal tolerance higher than the first signal tolerance, where the message channel contains one or more such control channel frames. 2. The method specified in Claim 1, in which the control channel frame shall include the slow integrated control channel (SACCH) frame. 3. The method specified in Claim 2, whereby the message channel shall consist of one frame for every eight frames of SACCH. 4. The method specified in Claim 1, where a portion of the tolerance period for such second signal is achieved by sending an SMS data message with increased transmission power. 5. The method specified in Claim 1, where a portion of the tolerance period of such second signal is obtained by encoding the SMS data message using forward error checking codes. 6. The method specified in Claim 1, where a portion of the tolerance period of such second signal is obtained by sending an SMS data message with increased transmission power and by an increased code of the SMS data message. 7. The method specified in Claim 1, where a portion of the tolerance for such second signal is obtained by dividing the SMS data message into sets of one or more bits, sending each set at a certain interval, and combining the transmissions of each set at the mobile station. 8. The method specified in Claim 1, whereby the SMS message will contain mobile station notification information indicating an incoming call. 9. The method of transmitting data messages over a TDMA communication channel consists of a number of frames, each frame containing a number of time slots, and each time slot containing a number of data bits. One of the given time slots within each frame is a time slot of the control channel. The method involves: - Encoding the data message to create one or more data code words, each code word selected from a set of mutually orthogonal data code words; and - Transmitting each data code word through the message channel, where the channel consists of one or more time slots of the said control channel. 10. The method specified in Claim 9, where the data word codes of such set of orthogonal data word codes are mutually orthogonal, shall include synchronized and frequency-adjusted information in addition to text information. 11. The method specified in Claim 10 where one or more control signal time slots are designed as frequency correction channels (FCHs). 12. The method specified in Claim 10 where one or more control signal time slots are designated as synchronization channels (SCH). 13. The method specified in Claim 10, whereby the timing channel of such control channel shall carry information of the control channel at the first signal tolerance, and such control channel shall carry information messages at a second signal tolerance greater than the first signal tolerance. 14. The method specified in claim 13, where a portion of the tolerance for such second signal is achieved, is by transmitting the data message at a higher transmission energy. 15. The method specified in Claim 13, where a portion of the tolerance for such second signal is obtained by encoding such information message using forward error correction coding. 16. The method specified in claim paragraph 13, where a portion of the tolerance for such second signal is obtained by transmitting the information at an increased transmission power and by increasing the encoding of such information message. 17. The method specified in Claim 13, where a portion of the tolerance for such second signal is obtained by dividing the data message into a number of bit sets, each bit being transmitted at a certain interval, and combining the transmissions of each set at the mobile station. 18. The method specified in Claim 13, whereby such information message shall contain information notifying the mobile station of an incoming call.