US 2011/0211520 A1 · HANDLING DISCONTINUOUS TRANSMISSION INDICATION BITS

Abstract

Transmitter(s) (34), radio base station nodes (38) comprising transmitter(s), and methods of operating transmitter(s)/radio base station(s) involve handling discontinuous transmission indication bits, particularly when transmitting using a 16 QAM signal point constellation having an I-branch and a Q-branch (for a quadruple of bits comprising two I-branch bits, i1 and i2, and two Q-branch bits q1 and q2). The transmitter(s) (34) and the radio base station nodes (28) comprised thereof are operated to perform a Multimedia Broadcast Multicast Service over Single Frequency Network (MBSFN) transmission wherein the MBSFN transmission comprises mapping data to a Secondary Common Control Physical Channel (S-CCPCH). For the Secondary Common Control Physical Channel (S-CCPCH) the methods include operating a 16 Quadrature Amplitude Modulation (QAM) transmitter (34) according to a predetermined strategy. The predetermined strategy is configured whereby one or more discontinuous transmission indication bits input to the transmitter (34) result in unambiguous determination of output values from an Inphase (I) output and a Quadrature (Q) output.

Claims19

Dependent claims

A baseband processing method in a transmitter for handling discontinuous transmission indication bits, DTX bits, when transmitting using a 16 QAM signal point constellation having an I-branch and a Q-branch wherein, for a quadruple of bits comprising two I-branch bits, i1 and i2, and two Q-branch bits q1 and q2, the method characterized by:

(1) performing no transmissions on both I and Q branches when both I-branch bits i1 and i2 and both Q-branch bits q1 and q2 are DTX bits;
(2) if both I-branch bits i1 and i2 are DTX bits and there is no DTX bit among the Q-branch bits q1 and q2, then repeating the Q-branch bits on the I-branch;
(3) if both Q-branch bits q1 and q2 are DTX bits and there is no DTX bit among the I-branch bits i1 and i2, then repeating the I-branch bits on the Q-branch;
(4) if there are three DTX bits and a non-DTX bit in the quadruple of bits, replacing the three DTX bits with the non-DTX bit;
(5) if there is a single DTX-bit in the I-branch bits, replacing the I-branch DTX-bit with the non-DTX bit of the I-branch;
(6) if there is a single DTX-bit in the Q-branch bits, replacing the Q-branch DTX-bit with the non-DTX bit of the Q-branch.

3 more elements

A method of operating a radio base station node (28) comprising:

performing a Multimedia Broadcast Multicast Service over Single Frequency Network (MBSFN) transmission, the MBSFN transmission comprising mapping data to a Secondary Common Control Physical Channel (S-CCPCH);
the method characterized by:
for the Secondary Common Control Physical Channel (S-CCPCH), operating a 16 Quadrature Amplitude Modulation (QAM) transmitter (34) according to a predetermined strategy whereby one or more discontinuous transmission (DTX) bits input to the transmitter (34) result in unambiguous determination of output values from an Inphase (I) output and a Quadrature (Q) output of the mapper.

A radio base station node (28) comprising

a 16 Quadrature Amplitude Modulation (QAM) transmitter (34);
characterized in that the 16 Quadrature Amplitude Modulation (QAM) transmitter (34) is configured to map data to a Secondary Common Control Physical Channel (S-CCPCH) according to a predetermined strategy whereby one or more discontinuous transmission (DTX) bits input to the transmitter (34) result in unambiguous determination of output values from an Inphase (I) output and a Quadrature (Q) output of the transmitter (34).

Dependencies are inferred from the claim text.

Handling discontinuous transmission indication bits

Life of this patent

Handling discontinuous transmission indication bits

Life of this patent

Abstract

Claims19