Generating and transmitting demodulation reference signals
First Claim
1. A method in a receiver node adapted for communication in a wireless communication system, the wireless communication system being adapted for using time-frequency resource elements (REs) for transmission of information, the method comprisingreceiving at least one first receiver specific demodulation reference signal associated with a data channel, wherein time-frequency REs of a first physical resource block (PRB) are utilized for transmission of the data channel and the at least one first receiver specific demodulation reference signal, and time-frequency REs of the first PRB being utilized for transmission of the at least one first receiver specific demodulation reference signal located in a first set of RE positions in the first PRB;
- receiving at least one second receiver specific demodulation reference signal associated with a control channel, wherein time-frequency REs of a second PRB are utilized for transmission of the control channel and the at least one second receiver specific demodulation reference signal, time-frequency REs of the second PRB being utilized for transmission of the at least one second receiver specific demodulation reference signal located in a second set of RE positions in the second PRB, and the second set of RE positions in the second PRB overlap with the first set of RE positions in the first PRB;
demodulating the control channel by using the at least one second receiver specific demodulation reference signal; and
using information derived from the demodulating for demodulating the data channel;
wherein a second sequence of symbols {bu,p(k)}, k=0, 1, . . . , L−
1 is used for modulating time-frequency resource elements at fixed positions within a second physical resource block for generation of the at least one second receiver specific demodulation reference signal, and the second physical resource block being used for transmission of the control channel at a transmit antenna port p, L is a positive integer.
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Abstract
The present disclosure provides a solution which solves the problem of demodulation reference signal (DMRS) ambiguity by introducing separate, i.e. different DMRSs. This is especially the case for systems employing dynamic allocation of control and data signals to different PRBs.
19 Citations
20 Claims
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1. A method in a receiver node adapted for communication in a wireless communication system, the wireless communication system being adapted for using time-frequency resource elements (REs) for transmission of information, the method comprising
receiving at least one first receiver specific demodulation reference signal associated with a data channel, wherein time-frequency REs of a first physical resource block (PRB) are utilized for transmission of the data channel and the at least one first receiver specific demodulation reference signal, and time-frequency REs of the first PRB being utilized for transmission of the at least one first receiver specific demodulation reference signal located in a first set of RE positions in the first PRB; -
receiving at least one second receiver specific demodulation reference signal associated with a control channel, wherein time-frequency REs of a second PRB are utilized for transmission of the control channel and the at least one second receiver specific demodulation reference signal, time-frequency REs of the second PRB being utilized for transmission of the at least one second receiver specific demodulation reference signal located in a second set of RE positions in the second PRB, and the second set of RE positions in the second PRB overlap with the first set of RE positions in the first PRB; demodulating the control channel by using the at least one second receiver specific demodulation reference signal; and using information derived from the demodulating for demodulating the data channel; wherein a second sequence of symbols {bu,p(k)}, k=0, 1, . . . , L−
1 is used for modulating time-frequency resource elements at fixed positions within a second physical resource block for generation of the at least one second receiver specific demodulation reference signal, and the second physical resource block being used for transmission of the control channel at a transmit antenna port p, L is a positive integer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus, comprising:
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a memory to store instruction; and at least one processor to execute the instructions to cause the apparatus to; receive at least one first receiver specific demodulation reference signal associated with a data channel, wherein time-frequency REs of a first physical resource block (PRB) are utilized for transmission of the data channel and the at least one first receiver specific demodulation reference signal, and time-frequency REs of the first PRB being utilized for transmission of the at least one first receiver specific demodulation reference signal located in a first set of RE positions in the first PRB; receive at least one second receiver specific demodulation reference signal associated with the control channel, wherein time-frequency REs of a second PRB are utilized for transmission of the control channel and the at least one second receiver specific demodulation reference signal, time-frequency REs of the second PRB being utilized for transmission of the at least one second receiver specific demodulation reference signal located in a second set of RE positions in the second PRB, and the second set of RE positions in the second PRB overlap with the first set of RE positions in the first PRB; demodulate the control channel by using the at least one second receiver specific demodulation reference signal; and use information derived from the demodulating for demodulating the data channel; wherein a second sequence of symbols {bu,p (k)}, k=0, 1, . . . , L−
1 is used for modulating time-frequency resource elements at fixed positions within a second physical resource block for generation of the at least one second receiver specific demodulation reference signal, and the second physical resource block being used for transmission of the control channel at a transmit antenna port p, L is a positive integer. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus, comprising:
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a processor, configured to generate at least one first receiver specific demodulation reference signal associated with a receiver specific data channel signal, and generate at least one second receiver specific demodulation reference signal associated with a receiver specific control channel signal; and a transmitter, configured to transmit the receiver specific control channel signal concurrently with the at least one second receiver specific demodulation reference signal, and transmit said receiver specific data channel signal concurrently with the at least one first receiver specific demodulation reference signal; wherein the at least one first receiver specific demodulation reference signal is generated by using a first sequence of symbols {ap(k)}, k=0, 1, . . . , L−
1 for modulating time-frequency resource elements at fixed positions within physical resource blocks used for transmission of data channel signals at a transmit antenna port p; andthe at least one second receiver specific demodulation reference signal is generated by using a second sequence of symbols {bup(k)}, k=0, 1, . . . , L−
1 for modulating time-frequency resource elements at fixed positions within physical resource blocks used for transmission of the receiver specific control channel signal at a transmit antenna port p, the second sequence of symbols {bu,p (k)} being a u-th sequence from a set of U sequences that can be allocated to one or more receiver nodes in a wireless communication system, L is a positive integer. - View Dependent Claims (20)
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Specification