Method and apparatus for scheduling in multiple-input multiple-output communication system

Patent metadata

Field	Value
Publication number	US-8948281-B2
Application number	US-201113011603-A
Country	US
Kind code	B2
Filing date	Jan 21, 2011
Priority date	Jan 22, 2010
Publication date	Feb 3, 2015
Grant date	Feb 3, 2015

Abstract

In a Multiple-Input Multiple-Output (MIMO) communication system, a serving evolved Node B (eNB) receives a channel covariance matrix of the serving eNB and a channel covariance matrix for a first neighbor eNB with the highest interference among neighbor eNBs, from a User Equipment (UE). Received signal power information is generated for each subband-beam pair. Interference signal power information is generated for each subband-beam pair for the first neighbor eNB. The generated interference signal power information is exchanged with the first neighbor eNB for each subband-beam pair. Beam coordination information indicating a use status of each beam in each subband is generated for the UE, using the interference signal power information of the first neighbor eNB. The generated beam coordination information is exchanged with the neighbor eNB. Scheduling is performed on the UE using the generated beam coordination information and the beam coordination information of the first neighbor eNB.

First claim

What is claimed is:

1. A method for performing a scheduling operation by a serving evolved node B (eNB) in a multiple-input multiple-output (MIMO) communication system, the method comprising:
receiving, from a user equipment (UE), a channel covariance matrix for the serving eNB and a channel covariance matrix for a first neighbor eNB with a highest interference among a plurality of neighbor eNBs;
generating received signal power information for each subband-beam pair;
generating a first interference signal power information for each subband-beam pair for the first neighbor eNB;
exchanging the first interference signal power information for a second interference signal power information generated by the first neighbor eNB for each subband-beam pair;
generating a first beam coordination information indicating a use status of each beam in each subband for the UE using the received signal power information and the second interference signal power information;
exchanging the first beam coordination information for a second beam coordination information generated by the first neighbor eNB;
determining available beams in each subband for the UE based on the first beam coordination information and the second beam coordination information; and
determining at least one of the available beams as at least one beam to be used for the UE, wherein an inner product value between the at least one beam to be used for the UE and at least one unused beam in each subband is smaller than a predetermined value.

2. The method of claim 1 , wherein exchanging the first interference signal power information for the second interference signal power information comprises exchanging the first interference signal power information for the second interference signal power information for a period longer than a period for which operation for determining at least one of the available beams is performed.

3. The method of claim 1 , wherein generating the received signal power information comprises generating the received signal power information using the following equation,

∏
k

⁢

(



H

0
⁢

⁢
m

k

⁢

v
j



2

⁢

P
Tx

)

ϕ
km

(
0
)

T
k

where k represents an index of the UE, H 0m k represents a downlink channel matrix from the serving eNB to the UE in a subband m, v j represents a precoding vector of a j-th beam, P Tx represents a transmit power of the serving eNB in the subband m, φ km (0) represents a ratio in which the UE is allocated the subband m from the serving eNB, and T k represents a throughput of the UE.

4. The method of claim 1 , wherein generating the first interference signal power information comprises generating the first interference signal power information using the following equation,

∏
k

⁢

(



H

i
⁢

⁢
m

k

⁢

v
j



2

⁢

P
Tx

)

ϕ
km

(
0
)

T
k

where i represents an index of the first neighbor eNB, k represents an index of the UE, H im k represents a downlink channel matrix from the first neighbor eNB to the UE in a subband m, v j represents a precoding vector of a j-th beam, P Tx represents a transmit power of the serving eNB in the subband m, φ km (0) represents a ratio in which the UE is allocated the subband m from the serving eNB, and T k represents a throughput of the UE.

5. The method of claim 1 , wherein generating the first beam coordination information comprises:
calculating a Signal-to-Leakage Ratio (SLR) for each subband-beam pair based on the received signal power information and the second interference signal power information;
comparing the calculated SLR with a threshold;
determining whether each beam is to be used in each subband based on a result of the comparison; and
generating the first beam coordination information using a result of the determination.

6. The method of claim 5 , further comprising maximizing the calculated SLR to generate a proportional fairness (PF) metric of an entire network.

7. The method of claim 1 , wherein the at least one beam is determined based on a signal-to-interference and noise ratio (SINR) calculated using the following equation,

γ
=

max

v
0

∈

V
0
m

⁢



H
00
m

Assignees

• Kim Eun-Yong
• Ko Eun-Seok
• Samsung Electronics Co Ltd

Inventors

• Kim Eun-Yong
• Ko Eun-Seok

Classifications

• H04L5/0091

  Signalling for the administration of the divided path, e.g. signalling of configuration information · CPC title

• H04W72/046

  the resource being in the space domain, e.g. beams · CPC title

• H04L5/0023

  Time-frequency-space · CPC title

• H04W72/27 Primary

  between access points · CPC title

• H04W72/542 Primary

  using measured or perceived quality · CPC title