Method and apparatus for configuring traffic-to-pilot power ratios in heterogeneous networks

• US 9,313,744 B2
• Filed: 10/26/2012
• Issued: 04/12/2016
• Est. Priority Date: 10/28/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Damnjanovic, Aleksandar, Damnjanovic, Jelena M., Wei, Yongbin
• Primary Examiner(s): Yuen, Kan
• Application Number:
  US13/662,207
• Publication Number:
  US 20130107823A1
• Time in Patent Office: 1,264 Days
• Field of Search: 370/252, 370/318, 370329-338
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
• 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 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A method, an apparatus, and a computer program product for wireless communication are provided in connection with specifying a traffic-to-pilot (T/P) ratio per subframe and/or resource block to allow a base station to transmit over the subframes and/or resource blocks using varying transmit powers. In one example, a device communicating with the base station can receive a plurality of T/P ratios each related to a power used by the base station to transmit over one of a plurality of carriers in a specific subframe or resource block, determine a power of a reference signal received from the base station over a carrier of the plurality of carriers, and process a data signal received over the carrier within the specific subframe or resource block based in part on applying, to the power of the reference signal, a T/P ratio of the plurality of T/P ratios corresponding to the carrier.

Claims

1. A method for processing signals at a user equipment (UE) based on a traffic-to-pilot (T/P) ratio received from a base station, comprising:

receiving, at the UE, a plurality of T/P ratios, wherein each T/P ratio is related to a power used by the base station to transmit over one of a plurality of carriers in a specific subframe or a specific resource block, and wherein a T/P ratio for a carrier of the plurality of carriers is a value between zero and one related to a proportion of a power for transmitting data signals and a power for transmitting reference signals;

determining a power of a reference signal received from the base station over a first carrier of the plurality of carriers, wherein the power of the reference signal is determined based on measurements by a receiver at the UE; and

processing a data signal received over the first carrier within the specific subframe or the specific resource block at least by applying, to the determined power of the reference signal, a first T/P ratio of the plurality of T/P ratios corresponding to the first carrier, and wherein an interfering data signal from an interfering base station received in the specific subframe or the specific resource block is at least partially canceled at the UE during the processing of the data signal based on a corresponding T/P ratio transmitted by the interfering base station,

wherein the power of the reference signal is used to demodulate the data signal or to report channel state information based on the data signal.

2. The method of claim 1, wherein the plurality of T/P ratios is received at the UE in a list or a map.

3. An apparatus for processing signals at a user equipment (UE) based on a traffic-to-pilot (T/P) ratio received from a base station, comprising:

means for receiving, at the UE, a plurality of T/P ratios, wherein each T/P ratio is related to a power used by the base station to transmit over one of a plurality of carriers in a specific subframe or a specific resource block, and wherein a T/P ratio of a carrier of the plurality of carriers is a value between zero and one related to a proportion of a power for transmitting data signals and a power for transmitting reference signals;

means for determining a power of a reference signal received from the base station over a first carrier of the plurality of carriers, wherein the power of the reference signal is determined based on measurements by a receiver at the UE; and

means for processing a data signal received over the first carrier within the specific subframe or the specific resource block at least by applying, to the determined power of the reference signal, a first T/P ratio of the plurality of T/P ratios corresponding to the first carrier, and wherein an interfering data signal from an interfering base station received in the specific subframe or the specific resource block is at least partially canceled at the UE during the processing of the data signal based on a corresponding T/P ratio transmitted by the interfering base station,

wherein the determined power of the reference signal is used to demodulate the data signal or to report channel state information based on the data signal.

4. The apparatus of claim 3, wherein the plurality of T/P ratios is received at the UE in a list or a map.

5. An apparatus for processing signals based on a traffic-to-pilot (T/P) ratio received from a base station, comprising:

a processor coupled to a memory, wherein the memory comprises executable instructions to cause the processor to;

receive a plurality of T/P ratios, wherein each T/P ratio is related to a power used by the base station to transmit over one of a plurality of carriers in a specific subframe or a specific resource block, wherein a T/P ratio of a carrier of the plurality of carriers is a value between zero and one related to a proportion of a power for transmitting data signals and a power for transmitting reference signals;

determine a power of a reference signal received from the base station over a first carrier of the plurality of carriers, wherein the power of the reference signal is determined based on measurements by a receiver at the apparatus; and

process a data signal received over the first carrier within the specific subframe or the specific resource block at least by applying, to the determined power of the reference signal, a first T/P ratio of the plurality of T/P ratios corresponding to the first carrier, and wherein an interfering data signal from an interfering base station received in the specific subframe or the specific resource block is at least partially canceled at the UE during the processing of the data signal based on a corresponding T/P ratio transmitted by the interfering base station,

wherein the determined power of the reference signal is used to demodulate the data signal or to report channel state information based on the data signal.

6. The apparatus of claim 5, wherein the plurality of T/P ratios is received at the UE in a list or a map.

7. A non-transitory computer-readable medium storing computer-executable code for processing signals at a user equipment (UE) based on a traffic-to-pilot (T/P) ratio received from a base station, comprising:

code executable to cause the UE to receive a plurality of T/P ratios, wherein each T/P ratio is related to a power used by the base station to transmit over one of a plurality of carriers in a specific subframe or a specific resource block, wherein a T/P ratio of a carrier of the plurality of carriers is a value between zero and one related to a proportion of a power for transmitting data signals and a power for transmitting reference signals;

code executable to cause the UE to determine a power of a reference signal received from the base station over a first carrier of the plurality of carriers, wherein the power of the reference signal is determined based on measurements by a receiver at the UE; and

code executable to cause the UE to process a data signal received over the first carrier within the specific subframe or the specific resource block at least by applying, to the determined power of the reference signal, a first T/P ratio of the plurality of T/P ratios corresponding to the first carrier, and wherein an interfering data signal from an interfering base station received in the specific subframe or the specific resource block is at least partially canceled at the UE during the processing of the data signal based on a corresponding T/P ratio transmitted by the interfering base station,

wherein the determined power of the reference signal is used to demodulate the data signal or to report channel state information based on the data signal.

8. The computer-readable medium of claim 7, wherein the plurality of T/P ratios is received at the UE in a list or a map.