Method and system of setting transmitter power levels

• US 8,311,570 B2
• Filed: 03/29/2011
• Issued: 11/13/2012
• Est. Priority Date: 07/30/2004
• Status: Active Grant

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: Airvana Corporation (CommScope Holding Company, Inc.)
• Inventors: Richardson, Andrew
• Primary Examiner(s): Rego, Dominic E
• Application Number:
  US13/074,813
• Publication Number:
  US 20110317574A1
• Time in Patent Office: 595 Days
• Field of Search: 455/522, 455/67.11, 455 68- 70, 455/115.3, 455/126, 455/127.1, 455/135, 455/226.3, 455/277.2, 455/525, 370/338, 370/445, 370/245, 370/908, 370/318
• US Class Current: 455/522
• CPC Class Codes: H04B 17/26 using historical data, averaging values or statistics
• CPC Class Codes: H04B 17/327 Received signal code power [RSCP]
• CPC Class Codes: H04W 36/12 Reselecting a serving backbone network switching or routing node
• CPC Class Codes: H04W 4/023 using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets
• CPC Class Codes: H04W 84/105 PBS [Private Base Station] network H04W84/12 - H04W84/16 take precedence

Abstract

The invention relates to a method and system of setting transmitter power levels, particularly in a Local Network Node transmitter, providing a pico cell for private use. A User Equipment (UE) is used to make measurements of the transmission link properties, such as downlink power and round trip time. Based on the measurements made at one or a plurality of locations, the power of the Local Network Node can be determined such that interference is minimized with any overlying cells of a macro-network. Call handovers between the UE and the cell of a macro network can also be arranged based on properties measure by the UE.

Claims

1. A local network node for providing a user equipment with a local connection to a mobile network, the mobile network comprising one or more cells overlapping a coverage area of the local network node, the local network node comprising:

a processor configured to;

receive, from the user equipment, first one or more parameters related to a power of a downlink between the user equipment and the local network node; and

receive, from the user equipment, second, different one or more parameters related to noise and interference on the downlink resulting from overlapping cells of the mobile network and other competing local network nodes, the second one or more parameters corresponding to a received signal code power measured at the user equipment for one or more of the overlapping cells and the other competing local network nodes; and

a measuring processor configured to determine a transmit power for the downlink between the local network node and the user equipment based on the first and second one or more parameters, and a minimum required power for a correct reception of a downlink signal at the user equipment.

2. The local network node of claim 1, wherein the measuring processor is configured to determine constants relating a radiation power of a transmitting antenna and a power received from the transmitting antenna, and a path loss exponent based on the first one or more parameters related to the power of the downlink.

3. The local network node of claim 1, wherein the measurement processor is configured to determine the transmit power based on an expression:

4. The local network node of claim 1, further comprising a controller configured to request that the user equipment measure the first one or more parameters related to the power of the downlink, and the second one or more parameters related to the noise or interference on the downlink.

5. A method of controlling transmit power of a downlink between a local network node and a user equipment provided with a local connection to a mobile network by the local network node, the mobile network comprising one or more cells overlapping a coverage area of the local network node, the method comprising:

measuring, via the user equipment, first one or more parameters related to a power of the downlink between the user equipment and the local network node;

measuring, via the user equipment, second, different one or more parameters related to noise and interference on the downlink resulting from overlapping cells of the mobile network and other competing local network nodes, the second one or more parameters corresponding to a received signal code power measured at the user equipment for one or more of the overlapping cells and the other competing local network nodes;

transmitting the one or more parameters related to the power of the downlink to the local network node; and

determining a transmit power for the downlink between the local network node and the user equipment based on the first and second one or more parameters, and a minimum required power for a correct reception of a downlink signal at the user equipment.

6. The method of claim 5, wherein determining the transmit power for the downlink between the local network node and the user equipment comprises:

using the first one or more parameters related to the power of the downlink to determine constants relating a radiation power of a transmitting antenna and a power received from the antenna, and a path loss exponent.

7. The method of claim 6, wherein determining the transmit power for the downlink between the local network node and the user equipment comprises determining the transmit power based on an expression:

8. The method of claim 5, further comprising transmitting a request from the local network node to the user equipment instructing the user equipment to measure the first one or more parameters related to the power of the downlink, and the second one or more parameters related to the noise or interference on the downlink.

9. The local network node of claim 8, further comprising determining constants relating a radiation power of a transmitting antenna and a power received from the transmitting antenna, and a path loss exponent based on the first one or more parameters related to the power of the downlink.

10. The local network node of claim 8, wherein the transmit power is determined based on an expression:

11. The local network node of claim 8, further comprising requesting that the user equipment measure the first one or more parameters related to the power of the downlink, and the second one or more parameters related to the noise or interference on the downlink.

12. A method for providing a user equipment with a local connection to a mobile network, the mobile network comprising one or more cells overlapping a coverage area of a local network node, the method comprising:

receiving, from the user equipment, first one or more parameters related to a power of a downlink between the user equipment and the local network node;

receiving, from the user equipment, second, different one or more parameters related to noise and interference on the downlink as a result of overlapping cells of the mobile network and other competing local network nodes, the second one or more parameters corresponding to a received signal code power measured at the user equipment for one or more of the overlapping cells and the other competing local network nodes; and

determining a transmit power for the downlink between the local network node and the user equipment based on the first and second one or more parameters, and a minimum required power for a correct reception of a downlink signal at the user equipment.