SYSTEM AND METHOD FOR GLOBAL POWER CONTROL

• US 20090170548A1
• Filed: 02/19/2009
• Published: 07/02/2009
• Est. Priority Date: 02/17/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Soliman, Samir S.
• Granted Patent: US 7,701,911 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/386 centralized, e.g. when the radio network controller or equivalent takes part in the power control

Abstract

A system and method are provided for global transmission power control in a wireless communication device. The method comprises: measuring the received power of a receiving device; collecting the received power measurements, and accepting a received power threshold; and, generating the optimal transmit power level for a transmitting device, in response to the collected received power measurements and received power threshold. The received power measurements of base station can be collected and the method generates the optimal transmit power level for a mobile station in response to the collected base station received power measurements. Alternately, the received power for mobile stations in a network downlink can be measured and collected, and the optimal transmit power level for a base station can be calculated in response to the collected mobile station received power measurements.

Claims

1. In a Code Division Multiple Access (CDMA) telephone network, a method for global uplink power control, the method comprising:

providing an uplink path loss matrix (L_u) between User Equipment (UE) and Node-B devices;

selecting a Node-B received power threshold matrix (Rb_th); and

generating a matrix (Pm_opt) of optimal transmit powers for UEs as follows;

Pm_opt=L_uinv[Rb_th−

Nb];

where L_uinv in the inverse of the matrix L_u; and

where Nb is a matrix representing the thermal noise of Node-B receivers.

2. In a Code Division Multiple Access (CDMA) telephone network, a method for global downlink power control, the method comprising:

providing a downlink path loss matrix (L_d) between Node-B and User Equipment (UE) devices;

selecting a UE received power threshold matrix (Rm_th); and

generating a matrix (Pb_opt) of optimal transmit powers for Node-Bs as follows;

Pb_opt=L_dinv[Rm_th−

Nm];

where Nm is a matrix representing the thermal noise of UE receivers; and

where L_dinv in the inverse of the matrix L_d.

3. In a Code Division Multiple Access (CDMA) telephone network, an apparatus for global uplink power control, comprising:

Node-B devices, each Node-B device having a measurement circuit for measuring the received power;

User Equipment (UE) devices, each UE having an air interface for transmitting to the Node-B devices;

a controller having an interface connected to the Node-B devices, the controller using an uplink path loss matrix (L_u) between UE and Node-B devices, and a Node-B received power threshold matrix (Rb_th) to generate a matrix (Pm_opt) of optimal transmit powers for UEs as follows;

Pm_opt=L_uinv[Rb_th−

Nb];

where L_uinv in the inverse of the matrix L_u; and

where Nb is a matrix representing the thermal noise of Node-B receivers; and

wherein the UEs transmit at the optimum power levels in response to instructions from the link controller.

4. In a Code Division Multiple Access (CDMA) telephone network, an apparatus for global downlink power control, comprising:

User Equipment (UE) devices, each UE having a measurement circuit for measuring received power;

Node-B devices, each Node-B device having an air interface for transmitting to the UEs;

a controller having an interface connected to the Node-B devices, the controller using a downlink path loss matrix (L_d) between Node-B and UE devices, and a UE received power threshold matrix (Rm_th) to generate a matrix (Pb_opt) of optimal transmit powers for Node-Bs as follows;

Pb_opt=L_dinv[Rm_th−

Nm];

where Nm is a matrix representing the thermal noise of UE receivers;

where L_dinv in the inverse of the matrix L_d; and

wherein the Node-B devices transmit at the optimum power levels in response to instructions from the link controller.

5. In a Code Division Multiple Access (CDMA) telephone network, a device for global uplink power control, comprising:

means for providing an uplink path loss matrix (L_u) between User Equipment (UE) and Node-B devices;

means for selecting a Node-B received power threshold matrix (Rb_th); and

means for generating a matrix (Pm_opt) of optimal transmit powers for UEs as follows;

Pm_opt=L_uinv[Rb_th−

Nb];

where L_uinv in the inverse of the matrix L_u; and

where Nb is a matrix representing the thermal noise of Node-B receivers.

6. In a Code Division Multiple Access (CDMA) telephone network, a device for global downlink power control, comprising:

means for providing a downlink path loss matrix (L_d) between Node-B and User Equipment (UE) devices;

means for selecting a UE received power threshold matrix (Rm_th); and

means for generating a matrix (Pb_opt) of optimal transmit powers for Node-Bs as follows;

Pb_opt=L_dinv[Rm_th−

Nm];

where Nm is a matrix representing the thermal noise of UE receivers; and

where L_dinv in the inverse of the matrix L_d.

7. In a Code Division Multiple Access (CDMA) telephone network, an integrated circuit for global uplink power control, comprising:

a processor operable to;

provide an uplink path loss matrix (L_u) between User Equipment (UE) and Node-B devices;

select a Node-B received power threshold matrix (Rb_th); and

generate a matrix (Pm_opt) of optimal transmit powers for UEs as follows;

Pm_opt=L_uinv[Rb_th−

Nb];

where L_uinv in the inverse of the matrix L_u; and

where Nb is a matrix representing the thermal noise of Node-B receivers.

8. In a Code Division Multiple Access (CDMA) telephone network, an integrated circuit for global uplink power control, comprising:

a processor operable to;

provide a downlink path loss matrix (L_d) between Node-B and User Equipment (UE) devices;

select a UE received power threshold matrix (Rm_th); and

generate a matrix (Pb_opt) of optimal transmit powers for Node-Bs as follows;

Pb_opt=L_dinv[Rm_th−

Nm];

where Nm is a matrix representing the thermal noise of UE receivers; and

where L_dinv in the inverse of the matrix L_d.