US Patent No. 9,660,779

METHOD, DEVICE, AND SYSTEM FOR TRANSMITTING REFERENCE SIGNAL


Patent No. 9,660,779
Issue Date May 23, 2017
Title Method, Device, And System For Transmitting Reference Signal
Inventorship Meifang Jing, Beijing (CN)
Xin Su, Beijing (CN)
Rakesh Tamrakar, Beijing (CN)
Qiubin Gao, Beijing (CN)
Assignee CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY, Beijing (CN)

Claim of US Patent No. 9,660,779

1. A method for transmitting a reference signal, wherein the method comprises:
determining, by the network side, sub-frames for carrying reference signals;
determining, by the network side, pilot ports of the reference signals; and
transmitting, by the network side, the reference signals, configured on the pilot ports, in the determined sub-frames,
wherein all the determined pilot ports comprise at least one row of horizontal pilot ports and one column of vertical pilot
ports, and the reference signals configured on the horizontal pilot ports are horizontal reference signals, whereas the reference
signals configured on the vertical pilot ports are vertical reference signals;

wherein the horizontal reference signals and the vertical reference signals are Channel State Information-Reference Signals,
CSI-RS's, defined in the 3GPP standard;

wherein if the sub-frames carrying the horizontal reference signals and the sub-frames carrying the vertical reference signals
are the same sub-frames, determining, by the network side, the pilot ports of the reference signals comprises:

configuring, by the network side, all of antenna ports in an array of antenna ports as pilot ports and determining each row
of pilot ports as a row of horizontal pilot ports and each column of pilot ports as a column of vertical pilot ports, wherein
the array of antenna ports is an array in which antenna ports supported by a cell are arranged, and a row in the array of
antenna ports represents a horizontal direction and comprises M antenna ports, a column therein represents a vertical direction
and comprises N antenna ports, and both M and N represent positive integers no less than 1; or

virtualizing, by the network side, antennas according to the array of antenna ports into a row of pilot ports and a column
of pilot ports for which reference signals need to be configured and determining the row of pilot ports as horizontal pilot
ports and the column of pilot ports as vertical pilot ports, wherein the number of the row of pilot ports is M, and the number
of the column of pilot ports is N;

wherein determining, by the network side, each row of pilot ports as a row of horizontal pilot ports and each column of pilot
ports as a row of vertical pilot ports further comprises:

if M*N is no larger than the largest number of ports configurable for CSI-RS's, then determining, by the network side, the
same CSI-RS configuration defined in the 3GPP standard as configurations of the reference signal of each horizontal pilot
port and the reference signal of each vertical pilot port, wherein the CSI-RS configuration comprises a periodicity at which,
an offset of a sub-frame in which, and time and frequency locations at which a CSI-RS is transmitted; or

the network side allocates port numbers 15 to (15+M?1) for each row of pilot ports so that the port numbers of each row of
horizontal pilot ports are 15 to (15+M?1), and all the port numbers of the j-th column of vertical pilot ports are (15+j?1),
wherein j represents an integer and the value of j ranges from 1 to M; and the network side allocates port numbers 15 to (15+N?1)
for each column of pilot ports so that the port numbers of each column of vertical pilot ports are 15 to (15+N?1), all the
port numbers of the i-th row of horizontal pilot ports are (15+i?1), wherein i represents an integer and the value of i ranges
from 1 to N;

wherein virtualizing, by the network side, the antennas comprises:
virtualizing, by the network side, the antennas by constant antenna virtualization weights into a row of pilot ports and a
column of pilot ports for which reference signals need to be configured; and

configuring, by the network side, a row of pilot ports as a result of virtualizing the antennas as horizontal pilot ports
and a column of pilot ports as the result of virtualizing the antennas as vertical pilot ports further comprises:

if M+N is no larger than the largest number of ports configurable for CSI-RS's, then determining, by the network side, the
same CSI-RS configuration defined in the 3GPP standard as configurations of the reference signal of each horizontal pilot
port and the reference signal of each vertical pilot port.