US 7,609,661 B2 · System and method for controlling uplink traffic load in a cellular wireless mobile communication system

Abstract

A method is provided for controlling an uplink traffic load in a wireless mobile communication system. A mobile station (MS) receives a reference signal from each of a base station (BS) of its home cell and a BS of a neighbor cell; calculates a power difference between the received reference signals to estimate a path loss value for each individual BS, and reports the estimated path loss value to the BS of the home cell. The BS of the home cell receives the estimated path loss value for each individual BS from the MS; and determines and allocates uplink traffic transmission power and a data rate to the MS taking the estimated path loss value into consideration. The MS transmits an uplink traffic signal taking into account the uplink traffic transmission power and the data rate allocated from the BS of the home cell.

Claims15

Dependent claims

A method for controlling an uplink traffic load by a mobile station (MS) in a wireless mobile communication system having a multi-cell configuration in which a full frequency band is divided into a plurality of sub-frequency bands and a neighbor cell reuses one of the divided sub-frequency bands, the method comprising the steps of:

receiving a reference signal from each of a base station (BS) of a home cell to which the MS belongs and a BS of a neighbor cell;
calculating a power difference between the received reference signals to estimate a path loss value for each individual BS, and reporting the estimated path loss value to the BS of the home cell;
and
transmitting an uplink traffic signal, taking into account uplink traffic transmission power and a data rate allocated from the BS of the home cell;
wherein the allocated uplink traffic transmission power satisfies
γ
i
<
L
ii
∑
j
≠
i
⁢
L
ij
and is determined by
P
0
=
(
γ
1
⁢
L
10
+
L
11
)
⁢
γ
0
L
00
⁢
L
11
-
γ
0
⁢
γ
1
⁢
L
10
⁢
L
01
⁢
η
P
1
=
(
γ
0
⁢
L
01
+
L
00
)
⁢
γ
1
L
00
⁢
L
11
-
γ
0
⁢
γ
1
⁢
L
10
⁢
L
01
⁢
η
where γi denotes a carrier-to-interference ratio (CIR) for an MS of an ith BS, Lab denotes a path loss value of an MS located in an ath BS for a bth BS, PA denotes uplink traffic transmission power for an MS of an Ath BS, and η denotes thermal noise power.

86 more elements

A method for controlling an uplink traffic load in a wireless mobile communication system having a multi-cell configuration in which a full frequency band is divided into a plurality of sub-frequency bands and a neighbor cell reuses one of the divided sub-frequency bands, the method comprising the steps of:

receiving, by a mobile station (MS), a reference signal from each of a base station (BS) of a home cell to which the MS belongs and a BS of a neighbor cell;
calculating a power difference between the received reference signals to estimate a path loss value for each individual BS, and reporting the estimated path loss value to the BS of the home cell;
receiving, by the BS of the home cell, the estimated path loss value for each individual BS from the MS;
determining uplink traffic transmission power and a data rate to be allocated to the MS taking the estimated path loss value into consideration;
allocating the determined uplink traffic transmission power and data rate to the MS;
and
transmitting, by the MS, an uplink traffic signal taking into account the uplink traffic transmission power and the data rate allocated from the BS of the home cell;
wherein the uplink traffic transmission power to be allocated to the MS is determined taking into account a data rate determined to be lower than a ratio of an estimated path loss value for each individual BS and an estimated path loss value to a home BS, received from the MS, to a sum of estimated path loss values to neighbor BSs, and is defined as
P
0
=
(
γ
1
⁢
L
10
+
L
11
)
⁢
γ
0
L
00
⁢
L
11
-
γ
0
⁢
γ
1
⁢
L
10
⁢
L
01
⁢
η
P
1
=
(
γ
0
⁢
L
01
+
L
00
)
⁢
γ
1
L
00
⁢
L
11
-
γ
0
⁢
γ
1
⁢
L
10
⁢
L
01
⁢
η
where γi denotes a carrier-to-interference ratio (CIR) for an MS of an ith BS, Lab denotes a path loss value of an MS located in an ath BS for a bth BS, PA denotes uplink traffic transmission power for an MS of an Ath BS, and η denotes thermal noise power.

76 more elements

A system for controlling an uplink traffic load in a wireless mobile communication system having a multi-cell configuration in which a full frequency band is divided into a plurality of sub-frequency bands and a neighbor cell reuses one of the divided sub-frequency bands, the system comprising:

a mobile station (MS) for receiving a reference signal from each of a base station (BS) of a home cell to which the MS belongs and a BS of a neighbor cell, calculating a power difference between the received reference signals to estimate a path loss value for each individual BS, reporting the estimated path loss value to the BS of the home cell, and transmitting an uplink traffic signal taking into account uplink traffic transmission power and a data rate allocated from the BS of the home cell;
and
a BS for receiving the estimated path loss value for each individual BS from the MS, determining uplink traffic transmission power and a data rate to be allocated to the MS taking the estimated path loss value into consideration, and allocating the determined uplink traffic transmission power and data rate to the MS;
wherein the BS determines the unlink traffic transmission power to be allocated to the MS taking into account a data rate determined to be lower than a ratio of an estimated path loss value for each individual BS and an estimated path loss value to a home BS, received from the MS, to a sum of estimated path loss values to neighbor BSs, and is defined as
P
0
=
(
γ
1
⁢
L
10
+
L
11
)
⁢
γ
0
L
00
⁢
L
11
-
γ
0
⁢
γ
1
⁢
L
10
⁢
L
01
⁢
η
P
1
=
(
γ
0
⁢
L
01
+
L
00
)
⁢
γ
1
L
00
⁢
L
11
-
γ
0
⁢
γ
1
⁢
L
10
⁢
L
01
⁢
η
where γi denotes a carrier-to-interference ratio (CIR) for an MS of an ith BS, Lab denotes a path loss value of an MS located in an ath BS for a bth BS, PA denotes unlink traffic transmission power for an MS of an Ath BS, and η denotes thermal noise power.

72 more elements

Dependencies are inferred from the claim text.

System and method for controlling uplink traffic load in a cellular wireless mobile communication system

Life of this patent

System and method for controlling uplink traffic load in a cellular wireless mobile communication system

Life of this patent

Abstract

Claims15