System and method for communicating using an in-vehicle system
View Patent ↗A system and method to be used with first and second devices where the first and second devices are capable of communicating using a subset of different modulation schemes wherein the subset includes at least first and second different modulation schemes, the method for optimizing transmission of data from the first device to the second device, the method comprising the acts of at the first device, when data is to be transmitted from the first device to the second device, receiving at least a portion of a trigger signal from the second device wherein the transmitted trigger signal includes data transmitted using a sequence of at least two of the modulation schemes from the subset, the portion of the trigger signal received being a received trigger signal, analyzing the received trigger signal to identify one of the modulation schemes from the subset as a function of the received trigger signal as an initial modulation scheme to be used to transmit data to the second device and transmitting the data from the first device to the second device using the initial modulation scheme.
1. A method in an answering point device for communicating with a mobile device using a subset of different modulation schemes wherein the subset includes at least first and second different modulation schemes, the method comprising the acts of:
at the answering point device, when data is to be transmitted from the mobile device to the answering point device:
transmitting a trigger signal to the mobile device wherein the transmitted trigger signal includes data transmitted using a predefined sequence of at least two modulation schemes from the subset of different modulation schemes;
receiving data from the mobile device;
determining when all anticipated data has been received from the mobile device; and
when all anticipated data has been received from the mobile device, ceasing transmission of the trigger signal.
2. The method of claim 1 wherein the sequence of modulation schemes in the transmitted signal includes alternating first and second modulation schemes.
3. The method of claim 1 wherein the mobile and second modulation schemes are a high rate data modulation scheme and a low rate data modulation scheme.
4. The method of claim 3 wherein symbols of at least one of the high rate data modulation scheme and the low rate data modulation scheme are sums of orthogonal sinusoids.
5. The method of claim 4 wherein all symbols of a particular at least one data modulation scheme are sums of k orthogonal sinusoids out of a set of n orthogonal sinusoids, where k and n are integer constants with k<n.
6. The method of claim 3 wherein the sequence of modulation schemes in the transmitted signal includes at least a first instance of the high rate modulation scheme followed by at least one instance of the low rate modulation scheme.
7. The method of claim 6 wherein the sequence of modulation schemes in the transmitted signal includes a plurality of sequential instances of the high rate modulation scheme followed by a plurality of sequential instances of the low rate modulation scheme.
8. An answering point device for communicating with a mobile device using a subset of different modulation schemes wherein the subset includes at least first and second different modulation schemes, the answering point device comprising:
a processor programmed to perform the acts of, when data is to be transmitted from the mobile device to the answering point device:
transmitting a trigger signal to the mobile device wherein the transmitted trigger signal includes data transmitted using a predefined sequence of at least two of the modulation schemes from the subset;
receiving data from the mobile device;
determining when all anticipated data has been received from the mobile device; and
when all anticipated data has been received from the mobile device, ceasing transmission of the trigger signal.
9. The answering point device of claim 8 wherein the sequence of modulation schemes in the transmitted signal includes alternating first and second modulation schemes.
10. The answering point device of claim 8 wherein the first and second modulation schemes are a high rate modulation scheme and a low rate modulation scheme.
11. The answering point device of claim 10 wherein the sequence of modulation schemes in the transmitted signal includes at least a first instance of the high rate modulation scheme followed by at least one instance of the low rate modulation scheme.
12. The answering point device of claim 11 wherein the sequence of modulation schemes in the transmitted signal includes a plurality of sequential instances of the high rate modulation scheme followed by a plurality of sequential instances of the low rate modulation scheme.