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US 9,313,003 B2Granted
Transmission method and device for a downlink reference signal
AssigneeLG Electronics Inc.
InventorsHyun Soo Ko, Jae Hoon Chung, Bin Chul Ihm, Moon Il Lee, Seung Hee Han
Life of this patent
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Abstract
The present invention relates a method in which a base station transmits a downlink signal by using a plurality of layers comprises the steps of: multiplexing and transmitting dedicated reference signals for the plurality of layers on the basis of a reference signal pattern, wherein 24 resource element positions comprised in the reference signal pattern are set as 6 groups, the 6 groups are set as 2 high-level groups, the reference signal for the plurality of layer is split and placed in the 2 high-level groups, and the reference signal for 2 or more layers placed in the same group is subjected to code-division multiplexing.
Claims12
A method of transmitting reference signals for at least one antenna port by a base station, the method comprising:
- mapping, by the base station, the reference signals for the at least one antenna port to resource elements having a predetermined pattern in a subframe;
- and
- transmitting, by the base station to a user equipment, the reference signals for the at least one antenna port,
- wherein the predetermined pattern includes a first group of resource elements and a second group of resource elements, wherein the first group and the second group have same positions in time domain and different positions in a frequency domain,
- wherein, in case a number of antenna ports is more than four, reference signals for an additional antenna port are mapped to the first group or the second group in turns,
- wherein, in case of one antenna port, reference signals for a first antenna port are mapped to the first group,
- wherein, in case of two antenna ports, reference signals for the first antenna port and a second antenna port are mapped to the first group,
- wherein, in case of three antenna ports, reference signals for the first antenna port and the second antenna port are mapped to the first group, and reference signals for a third antenna port are mapped to the second group,
- wherein, in case of four antenna ports, reference signals for the first antenna port and the second antenna port are mapped to the first group, and reference signals for the third antenna port and a fourth antenna port are mapped to the second group, and
- wherein, in case of five antenna ports, reference signals for the first antenna port, the second antenna port and a fifth antenna port are mapped to the first group, and reference signals for the third antenna port and the fourth antenna port are mapped to the second group.
7 more elements
A method of receiving reference signals for at least one antenna port by at a user equipment, the method comprising:
- receiving, by the user equipment from a base station, the reference signals for the at least one antenna port;
- and
- demodulating, by the user equipment, data for the at least one antenna port using the reference signals for the at least one antenna port,
- wherein the predetermined pattern includes a first group of resource elements and a second group of resource elements, wherein the first group and the second group have same positions in time domain and different positions in a frequency domain,
- wherein, in case a number of antenna ports is more than four, reference signals for an additional antenna port are mapped to the first group or the second group in turns,
- wherein, in case of one antenna port, reference signals for a first antenna port are mapped to the first group,
- wherein, in case of two antenna ports, reference signals for the first antenna port and a second antenna port are mapped to the first group,
- wherein, in case of three antenna ports, reference signals for the first antenna port and the second antenna port are mapped to the first group, and reference signals for a third antenna port are mapped to the second group,
- wherein, in case of four antenna ports, reference signals for the first antenna port and the second antenna port are mapped to the first group, and reference signals for the third antenna port and a fourth antenna port are mapped to the second group, and
- wherein, in case of five antenna ports, reference signals for the first antenna port, the second antenna port and a fifth antenna port are mapped to the first group, and reference signals for the third antenna port and the fourth antenna port are mapped to the second group.
7 more elements
A base station for transmitting reference signals for at least one antenna port, comprising:
- a reception module;
- a transmission module;
- and
- a processor,
- wherein the processor is configured to:
- map the reference signals for the at least one antenna port to resource elements having a predetermined pattern in a subframe;
- and
- transmit, to a user equipment via the transmission module, the reference signals for the at least one antenna port,
- wherein the predetermined pattern includes a first group of resource elements and a second group of resource elements, wherein the first group and the second group have same positions in time domain and different positions in a frequency domain,
- wherein, in case a number of antenna ports is more than four, reference signals for an additional antenna port are mapped to the first group or the second group in turns,
- wherein, in case of one antenna port, reference signals for a first antenna port are mapped to the first group,
- wherein, in case of two antenna ports, reference signals for the first antenna port and a second antenna port are mapped to the first group,
- wherein, in case of three antenna ports, reference signals for the first antenna port and the second antenna port are mapped to the first group, and reference signals for a third antenna port are mapped to the second group,
- wherein, in case of four antenna ports, reference signals for the first antenna port and the second antenna port are mapped to the first group, and reference signals for the third antenna port and a fourth antenna port are mapped to the second group, and
- wherein, in case of five antenna ports, reference signals for the first antenna port, the second antenna port and a fifth antenna port are mapped to the first group, and reference signals for the third antenna port and the fourth antenna port are mapped to the second group.
12 more elements
A user equipment for receiving reference signals for at least one antenna port, comprising:
- a reception module;
- a transmission module;
- and
- a processor,
- wherein the processor is configured to;
- receive, from a base station via the reception module, the reference signals for the at least one antenna port;
- and
- demodulate data for the at least one antenna port using the reference signals for the at least one antenna port,
- wherein the predetermined pattern includes a first group of resource elements and a second group of resource elements, wherein the first group and the second group have same positions in time domain and different positions in a frequency domain,
- wherein, in case a number of antenna ports is more than four, reference signals for an additional antenna port are mapped to the first group or the second group in turns,
- wherein, in case of one antenna port, reference signals for a first antenna port are mapped to the first group,
- wherein, in case of two antenna ports, reference signals for the first antenna port and a second antenna port are mapped to the first group,
- wherein, in case of three antenna ports, reference signals for the first antenna port and the second antenna port are mapped to the first group, and reference signals for a third antenna port are mapped to the second group,
- wherein, in case of four antenna ports, reference signals for the first antenna port and the second antenna port are mapped to the first group, and reference signals for the third antenna port and a fourth antenna port are mapped to the second group, and
- wherein, in case of five antenna ports, reference signals for the first antenna port, the second antenna port and a fifth antenna port are mapped to the first group, and reference signals for the third antenna port and the fourth antenna port are mapped to the second group.
12 more elements
Dependencies are inferred from the claim text.