Layered modulation for machine type communication (MTC) transmissions
AssigneeKYOCERA Corporation
InventorsAmit Kalhan, Henry Chang
Life of this patent
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Abstract
A base station broadcasts information to machine type communication (MTC) devices in the coverage area of the base station using multiple transmissions with layered modulation. Each transmission includes a different sequence of bits representing the information. A MTC device receiving the signals for the transmissions at a sufficiently high quality can recover the information by using a high modulation order on one of the transmissions. A MTC device receiving the signals of the transmissions at less than the sufficient quality can receive the information by applying a lower modulation order to multiple transmissions.
Claims14
A method comprising:
- transmitting sequence information indicating a scrambling sequence of coded bits in at least one transmission of multiple transmissions;
- and
- broadcasting machine type communication (MTC) information in the multiple transmissions using layered modulation such that a first MTC device receiving the multiple transmissions at a first signal quality can recover the MTC information using a high modulation order and such that a second MTC device receiving the transmissions at a lower signal quality can recover the MTC information using a lower modulation order lower than the high modulation order.
A base station comprising:
- an encoder configured to code machine type communication (MTC) information to generate a plurality of coded bits;
- a sequencer configured to generate, based on the plurality of coded bits, a first sequence of bits and a second sequence of bits having a different sequence from the first sequence of bits;
- a modulator configured to modulate the first sequence of bits using layered modulation to generate a first modulated signal and to modulate the second sequence of bits using layered modulation to generate a second modulated signal;
- transmitter configured to:
- transmit the first modulated signal and the second modulated signal such that a first MTC device receiving the first modulated signal at a first signal quality can recover the MTC information using a high modulation order and such that a second MTC device receiving the first modulated signal and the second modulated signal at a second signal quality lower than the first signal quality can recover the MTC information using a lower modulation order lower than the high modulation order, and
- transmit sequence information indicating a scrambling sequence of coded bits of at least one of the transmissions.
Dependencies are inferred from the claim text.