METHOD AND APPARATUS FOR USING CHANNEL STATE INFORMATION REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM
A method for wireless communication is disclosed which includes selecting a first resource pattern comprising resource elements that are non-colocated with a second resource pattern and allocating the first resource pattern to a plurality of antennas for transmitting a channel state information reference signal.
1 . A method for wireless communication, comprising:
selecting a first resource pattern comprising resource elements, the first resource pattern being non-colocated with a second resource pattern; and
allocating the first resource pattern to a plurality of antennas for transmitting a channel state information reference signal (CSI-RS).
2 . The method of claim 1 , wherein the second resource pattern comprises transmission resources allocated, in one or more cells, to one or more of a user equipment reference signal, a common reference signal and a control signal.
3 . The method of claim 1 , wherein the second resource pattern comprises transmission resources allocated to one or more of a sync signal, a paging signal and a broadcast signal.
4 . The method of claim 1 , further comprising limiting CSI-RS transmissions from the plurality of antennas to a predetermined number of subframes.
5 . The method of claim 4 , wherein the limiting further comprises coordinating with at least one other cell so that CSI-RS transmissions thereof are also limited to the predetermined number of subframes.
6 . The method of claim 1 , further comprising selectively hopping the first resource pattern.
7 . The method of claim 6 , wherein the selectively hopping the first resource pattern comprises selectively hopping the first resource pattern as a function of one or more of a subframe type and a cell identification.
8 . The method of claim 7 , further comprising enabling or disabling the selective hopping.
9 . The method of claim 8 , further comprising signaling the enabling or disabling of the selective hopping to a user equipment.
10 . The method of claim 6 , further comprising signaling a hopping schedule parameter to a user equipment.
11 . The method of claim 1 , wherein the second resource pattern comprises a transmission resource pattern allocated in another cell.
12 . The method of claim 1 , wherein the allocating the first resource pattern comprises:
grouping the first resource pattern in a plurality of groups of resource elements; and
assigning a group of resource elements to an antenna of the plurality of antennas.
13 . The method of claim 12 , wherein CSI-RS transmissions from the plurality of antennas are orthogonal to each other in one or more of a time domain, a frequency domain and a code domain.
14 . The method of claim 12 , wherein the grouping comprises grouping two resource elements in a group.
15 . The method of claim 1 , wherein the allocating comprises allocating a predetermined number of the uniformly spaced resource elements to each antenna of the plurality of antennas.
16 . The method of claim 1 , wherein the second resource pattern comprises transmission resources allocated to a common reference signal in another cell.
17 . The method of claim 1 , wherein the selecting the first resource pattern is based on one or more of a cell identification, a number of the plurality of antennas and a subframe index for transmission of the CSI-RS.
18 . An apparatus for wireless communication, comprising:
means for selecting a first resource pattern comprising resource elements, the first resource pattern being non-colocated with a second resource pattern; and
means for allocating the first resource pattern to a plurality of antennas for transmitting a channel state information reference signal (CSI-RS).
19 . The apparatus of claim 18 , further comprising means for limiting CSI-RS transmissions from the plurality of antennas to a predetermined number of subframes.
20 . The apparatus of claim 18 , further comprising means for selectively hopping the first resource pattern.
21 . An apparatus for wireless communication, comprising:
a processor configured for:
selecting a first resource pattern comprising resource elements, the first resource pattern being non-colocated with a second resource pattern; and
allocating the first resource pattern to a plurality of antennas for transmitting a channel state information reference signal (CSI-RS).
22 . The apparatus of claim 21 , wherein the processor is further configured for allocating a predetermined number of the uniformly spaced resource elements to each antenna of the plurality of antennas.
23 . A computer program product, comprising:
a computer-readable storage medium comprising:
instructions for causing at least one computer to select a first resource pattern comprising resource elements, the first resource pattern being non-colocated with a second resource pattern; and
instructions for causing the at least one computer to allocate the first resource pattern to a plurality of antennas for transmitting a channel state information reference signal (CSI-RS).
24 . The computer program product of claim 23 , wherein the instructions for causing the at least one computer to allocate further comprises instructions for causing the at least one computer to:
group the first resource pattern in a plurality of groups of resource elements; and
assign a group of resource elements to an antenna of the plurality of antennas.
25 . The computer program product of claim 23 , wherein the computer-readable storage medium further comprises instructions for causing the at least one computer to limit CSI-RS transmissions from the plurality of antennas to a predetermined number of subframes.
26 . A method for wireless communication, comprising:
coordinating, with a base station in a neighboring cell, a resource pattern allocated for transmission of a reference signal; and
muting, based on the coordination, the resource pattern at locations corresponding resource pattern allocated in the neighboring cell.
27 . The method of claim 26 , further comprising orthogonalizing the resource pattern with respect to the corresponding resource pattern allocated in the neighboring cell.
28 . The method of claim 26 , further comprising signaling, to a user equipment, information related to the muting.
29 . The method of claim 26 , wherein the coordinating comprises coordinating the resource pattern allocated for transmission of a channel state information reference signal.
30 . An apparatus for wireless communication, comprising:
means for coordinating, with a base station of a neighboring cell, a resource pattern allocated for transmission of a reference signal; and
means for muting, based on the coordination, the resource pattern at locations corresponding resource pattern allocated in the neighboring cell.
31 . A method for wireless communication, comprising:
receiving a first resource pattern comprising resource elements that are non-colocated with a second resource pattern;
receiving a channel state information reference signal (CSI-RS) according to the first resource pattern; and
performing a channel quality estimate based on the CSI-RS.
32 . The method of claim 31 , further comprising receiving one of a user equipment reference signal and a common reference signal according to the second resource pattern.
33 . The method of claim 31 , further comprising reporting the channel quality estimate to a base station.
34 . An apparatus for wireless communication, comprising:
means for receiving a first resource pattern comprising resource elements that are non-colocated with a second resource pattern;
means for receiving a channel state information reference signal (CSI-RS) according to the first resource pattern; and
means for performing a channel quality estimate based on the CSI-RS.
35 . The apparatus of claim 34 , further comprising means for receiving one of a user equipment reference signal and a common reference signal according to the second resource pattern.
36 . A computer program product, comprising:
a computer-readable storage medium comprising:
instructions for causing at least one computer to receive a first resource pattern comprising resource element groups that are non-colocated with a second resource pattern;
instructions for causing the at least one computer to receive a channel state information reference signal (CSI-RS) according to the first resource pattern; and
instructions for causing the at least one computer to perform a channel quality estimate based on the CSI-RS.
37 . An apparatus for wireless communication, comprising:
a processor configured for:
receiving a first resource pattern comprising resource element groups that are non-colocated with a second resource pattern;
receiving a channel quality estimate reference signal (CSI-RS) according to the first resource pattern; and
performing a channel quality estimate based on the channel state information reference signal.
38 . The apparatus of claim 37 , wherein the processor is further configured for receiving one of a user equipment reference signal and a common reference signal according to the second resource pattern.