Method and apparatus for measuring MU-MIMO interference in mobile communication system
One or more embodiments discloses a method of measuring interference by an evolved NodeB and an eNB device. The method includes configuring one or more first type interference measurement resources in a User Equipment (UE). The method also includes transmitting signals for a plurality of UEs within a cell range of the eNB to the one or more first type interference measurement resources. The method also includes receiving channel status information generated in accordance with a signal received in the one or more first type interference measurement resources.
1. A method by a base station performing multiple input multiple output (MIMO) transmission, the method comprising:
transmitting, to a plurality of terminals, a message configuring a first type interference measurement resource (IMR) for measuring interference between terminals within a coverage of the base station and a second type IMR for measuring interference from at least one neighbor base station;
transmitting, to the plurality of terminals, a signal based on the first type IMR and the second type IMR; and
receiving, from a terminal among the plurality of terminals, channel status information (CSI) generated based on the signal,
wherein the interference between the terminals within the coverage of the base station is measured by removing a signal component of the terminal itself from the transmitted signal using the first type IMR, and
wherein the interference between the terminals is measured by using an equation of
∑
j
∈
C
i
k
j
≠
M
P
i
,
j
k
·
w
i
,
j
k
·
s
i
,
j
k
=
∑
j
∈
C
i
k
P
i
,
j
k
·
w
i
,
j
k
·
s
i
,
j
k
-
P
i
,
M
k
·
w
i
,
M
k
·
s
i
,
M
k
,
where
∑
j
∈
C
i
k
P
i
,
j
k
·
w
i
,
j
k
·
s
i
,
j
k
is the signal for the plurality of terminals, P i,j k is a transmission power which an i-th base station allocates to a j-th terminal in a k-th subframe, w i,j k is a precoding which the i-th base station applies to the j-th terminal in the k-th subframe, s i,j k is a signal which the base station transmits to allow a terminal to measure interference, C i k is a set of terminals to which the i-th base station or a transmission position allocates downlink resources in the k-th subframe, and P i,M k ·w i,M k ·s i,M k is the removed signal component.
2. The method of claim 1 , wherein the base station is configured not to transmit the signal on the second type IMR to allow the terminal to measure the interference from the at least one neighbor base station.
3. The method of claim 1 , wherein the CSI includes information on an interference from adjacent terminals within the coverage of the base station except for the terminal.
4. A base station performing multiple input multiple output (MIMO) transmission, the base station comprising:
a transceiver configured to transmit and receive a signal; and
a controller configured to control the transceiver to:
transmit, to a plurality of terminals, a message configuring a first type interference measurement resource (IMR) for measuring interference between terminals within a coverage of the base station and a second type IMR for measuring interference from at least one neighbor base station,
transmit, to the plurality of terminals, a signal based on the first type IMR and the second type IMR, and
receive, from a terminal among the plurality of terminals, channel status information (CSI) generated based on the signal,
wherein the interference between the terminals within the coverage of the base station is measured by removing a signal component of the terminal itself from the transmitted signal using the first type IMR, and
wherein the interference between the terminals is measured by using an equation of
∑
j
∈
C
i
k
j
≠
M
P
i
,
j
k
·
w
i
,
j
k
·
s
i
,
j
k
=
∑
j
∈
C
i
k
P
i
,
j
k
·
w
i
,
j
k
·
s
i
,
j
k
-
P
i
,
M
k
·
w
i
,
M
k
·
s
i
,
M
k
,
where
∑
j
∈
C
i
k
P
i
,
j
k
·
w
i
,
j
k
·
s
i
,
j
k
is the signal for the plurality of terminals P i,j k is a transmission power which an i-th base station allocates to a j-th terminal in a k-th subframe w i,j k is a precoding which the i-th base station applies to the j-th terminal in the k-th subframe, s i,j k is a signal which the base station transmits to allow a terminal to measure interference, C i k is a set of terminals to which the i-th base station or a transmission position allocates downlink resources in the k-th subframe, and P i,M k ·w i,M k ·s i,M k is the removed signal component.
5. The base station of claim 4 , wherein the base station is configured not to transmit the signal on the second type IMR to allow the terminal to measure the interference from the at least one neighbor base station.
6. The base station of claim 4 , wherein the CSI includes interference information for terminals within a coverage of the base station except for the terminal.
7. A method of by a terminal, the method comprising:
receiving, from a base station performing multiple input multiple output (MIMO) transmission, a message configuring a first type interference measurement resource (IMR) for measuring interference between terminals within a coverage of the base station and a second type IMR for measuring interference from at least one neighbor base station;
receiving, from the base station, a signal based on the first type IMR and the second type IMR;
transmitting, to the base station, channel status information (CSI) generated based on an interference measured from the signal,
wherein the interference between the terminals within the coverage of the base station is measured by removing a signal component of the terminal itself from the transmitted signal using the first type IMR, and
wherein the interference between the terminals is measured by using an equation of
∑
j
∈
C
i
k
j
≠
M
P
i
,
j
k
·
w
i
,
j
k
·
s
i
,
j
k
=
∑
j
∈
C
i
k
P
i
,
j
k
·
w
i
,
j
k
·
s
i
,
j
k
-
P
i
,
M
k
·
w
i
,
M
k
·
s
i
,
M
k
,
where
∑
j
∈
C
i
k
P
i
,
j
k
·
w
i
,
j
k
·
s
i
,
j
k
is the signal for the plurality of terminals P i,j k is a transmission power which an i-th base station allocates to a j-th terminal in a k-th subframe, w i,j k is a precoding which the i-th base station applies to the j-th terminal in the k-th subframe, s i,j k is a signal which the base station transmits to allow a terminal to measure interference, C i k is a set of terminals to which the i-th base station or a transmission position allocates downlink resources in the k-th subframe, and P i,M k ·w i,M k ·s i,M k is the removed signal component.
8. The method of claim 7 , wherein the base station is configured not to transmit the signal on the second type IMR to allow the terminal to measure the interference from the at least one neighbor base station.
9. The method of claim 7 , wherein the transmitting the CSI comprises generating the CSI by using a strength of the interference corresponding to a sum of a first interference and a second interference based on an equation of I total =α·I A +I B , where I A is the first interference measured from the second type IMR, I B is the second interference measured from the first type IMR, α is a predetermined value.
10. The method of claim 7 , wherein the CSI includes information on an interference from adjacent terminals within the coverage of the base station except for the terminal.
11. A terminal comprising:
a transceiver configured to transmit and receive a signal; and
a controller configured to control the transceiver to:
receive, from a base station performing multiple input multiple output (MIMO) transmission, a message configuring a first type interference measurement resource (IMR) for measuring interference between terminals within a coverage of a base station and a second type IMR for measuring interference from at least one neighbor base station,
receive, from the base station, a signal based on the first type IMR and the second type IMR, and
transmit, to the base station, channel status information (CSI) generated based on an interference measured from the signal,
wherein the interference between the terminals within the coverage of the base station is measured by removing a signal component of the terminal itself from the transmitted signal using the first type IMR, and
wherein the interference between the terminals is measured by using an equation of
∑
j
∈
C
i
k
j
≠
M
P
i
,
j
k
·
w
i
,
j
k
·
s
i
,
j
k
=
∑
j
∈
C
i
k
P
i
,
j
k
·
w
i
,
j
k
·
s
i
,
j
k
-
P
i
,
M
k
·
w
i
,
M
k
·
s
i
,
M
k
,
where
∑
j
∈
C
i
k
P
i
,
j
k
·
w
i
,
j
k
·
s
i
,
j
k
is the signal for the plurality of terminals, P i,j k is a transmission power which an i-th base station allocates to a j-th terminal in a k-th subframe, w i,j k is a precoding which the i-th base station applies to the j-th terminal in the k-th subframe, s i,j k is a signal which the base station transmits to allow a terminal to measure interference, C i k is a set of terminals to which the i-th base station or a transmission position allocates downlink resources in the k-th subframe, and P i,M k ·w i,M k ·s i,M k is the removed signal component.
12. The terminal of claim 11 , wherein the base station is configured not to transmit the signal on the second type IMR to allow the terminal to measure the interference from the at least one neighbor base station.
13. The terminal of claim 11 , wherein the controller is further configured to generate the CSI by using a strength of the interference corresponding to a sum of a first interference and a second interference based on an equation of I total =α·I A +I B , where I A is the first interference measured from the second type IMR, I B is the second interference measured from the first type IMR, α is a predetermined value.
14. The terminal of claim 11 , wherein the CSI includes information on an interference from adjacent terminals within the coverage of the base station except for the terminal.