Channel Quality Indicator Adjustment to Account for Network-Assisted Interference Cancellation

Patent metadata

Field	Value
Publication number	US-2016182183-A1
Application number	US-201414910460-A
Country	US
Kind code	A1
Filing date	Jul 10, 2014
Priority date	Aug 8, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

Techniques for adjusting channel quality reports to reflect interference cancellation at a mobile terminal are disclosed. An example embodiment is a method, in a node of a wireless network, for adjusting channel quality reports received from a mobile terminal to account for interference cancellation performed by the mobile terminal. According to this example method, a channel quality report for a serving cell is received from the mobile terminal. Further, one or more mobility measurement reports for the serving cell and at least one interfering cell are received from the mobile terminal. The channel quality report is then adjusted, based on the one or more mobility measurement reports. The resulting adjusted channel quality report may be used for any of several purposes, including, for example, to scheduling for the mobile terminal and adapting of modulation and coding schemes for the mobile terminal.

First claim

1 - 29 . (canceled)

30 . A method, in a node of a wireless network, for adjusting channel quality reports received from a mobile terminal to account for interference cancellation performed by the mobile terminal, the method comprising:
receiving a channel quality report for a serving cell from the mobile terminal; receiving one or more mobility measurement reports for the serving cell and at least one interfering cell from the mobile terminal; and adjusting the channel quality report, based on the one or more mobility measurement reports.

31 . The method of claim 30 , wherein the one or more mobility measurement reports are indicative of a received power of the desired signal and a received power for an interfering signal.

32 . The method of claim 31 , wherein adjusting the channel quality report is based on an estimate of a ratio between the received power of the interfering signal and the received power of the desired signal.

33 . The method of claim 30 , wherein the channel quality report indicates a signal-to-interference-plus-noise ratio (SINR) for a desired signal at the mobile terminal.

34 . The method of claim 30 , wherein the one or more mobility measurement reports include an indication of a received code signal power (RCSP) or an indication of an energy-per-chip-to-interference ratio (Ec/Io) or both, for either or both of the desired signal and an interfering signal.

35 . The method of claim 30 , wherein adjusting the channel quality report comprises adjusting the channel quality report to account for a reduction in interfering signal power by the interference cancellation at the mobile terminal.

36 . The method of claim 30 , wherein adjusting the channel quality report is further based on an estimate of the efficiency of the interference cancellation performed by the mobile terminal.

37 . The method of claim 30 , wherein adjusting the channel quality report is based on an estimate of a ratio of the powers at the mobile terminal between an interfering signal and a desired signal and wherein said ratio of the powers is calculated according to

P
Macro

P
LPN

≈

RSCP


(
Macro
)

RSCP


(
LPN
)

,


or

P
Macro

P
LPN

≈

Ec


(
macro
)

/
Io

Ec


(
LPN
)

/
Io

,


or

P
Macro

P
LPN

≈

CQI


(
macro
)

/
Io

CQI


(

LPN



to



UE

)

,

where

P
Macro

P
LPN

 is the estimated ratio of powers, RSCP (Macro) and RSCP (LPN) are received signal code power (RSCP) measurements for the interfering and desired signals respectively, Ec(macro)/Io and Ec(LPN)/Io are energy-per-chip-over-interference measurements for the interfering and desired signals, respectively, and CQI(macro to UE) and CQI(LPN to UE) are reported channel-quality-indicators for the interfering and desired signals, respectively.

38 . The method of claim 30 , wherein said adjusting the channel quality report comprises adjusting the channel quality report according to the expression

(

SIN




R
IC



(
LPN
)

)

-
1

=

(

SIN




R


(
LPN
)

)

Assignees

• Ericsson Telefon Ab L M

Inventors

• Wang Yi-Pin Eric
• Nammi Sairamesh
• Reial Andres

Classifications

• H04B17/336

  Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] · CPC title

• H04L1/20

  using signal quality detector · CPC title

• H04B17/345

  Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) · CPC title

• H04L1/0001 Primary

  Systems modifying transmission characteristics according to link quality, e.g. power backoff (adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04) · CPC title