Selective Interference Cancellation in the Range-Expansion Region of a Heterogeneous Network

Patent metadata

Field	Value
Publication number	US-2016197693-A1
Application number	US-201414912751-A
Country	US
Kind code	A1
Filing date	Aug 19, 2014
Priority date	Aug 19, 2013
Publication date	Jul 7, 2016
Grant date	—

Abstract

A mobile terminal determines that it is operating in a range-expansion region and performs interference cancellation techniques that are particularly advantageous in the range-expansion region. An example method of receiving a target link signal at a receiving device, where the target link signal is received in a received signal that also includes an interfering link signal, thus includes determining ( 510 ) that the receiving device is operating in a range-expansion region of a low-power node in a heterogeneous network deployment, based on a serving-cell geometry metric or a dominant-interferer ratio metric or both. The method further includes configuring ( 520 ) the receiving device to perform interference cancellation, responsive to determining that the receiving device is operating in a range-expansion region. The example method continues with performing ( 530 ) the configured interference cancellation on the interfering link signal, and then demodulating and decoding ( 540 ) the target link signal.

First claim

1 - 30 . (canceled)

31 . A method of receiving a target link signal at a receiving device, wherein the target link signal is received in a received signal that also includes an interfering link signal, the method comprising:
determining that the receiving device is operating in a range-expansion region of a low-power node in a heterogeneous network deployment, based on a serving-cell geometry metric or a dominant-interferer ratio metric or both; responsive to determining that the receiving device is operating in a range-expansion region, configuring the receiving device to perform interference cancellation, wherein said configuring is based on said determining; performing said interference cancellation on the interfering link signal; and demodulating and decoding the target link signal to provide a target link bit stream.

32 . The method of claim 31 , wherein configuring the receiving device to perform interference cancellation comprises selecting one or more of a plurality of interference-cancellation techniques, wherein said selecting is based on determining that the receiving device is operating in the range-expansion region.

33 . The method of claim 32 , wherein said selecting comprises selecting a post-decoding data-channel interference-cancellation technique in response to determining that the receiving device is operating in the range-expansion region.

34 . The method of claim 33 , wherein said selecting further comprises selecting a non-data-channel interference-cancellation technique in response to determining that the receiving device is operating in the range-expansion region, and wherein performing said interference cancellation on the interfering link signal comprises performing both the post-decoding data-channel interference-cancellation technique and the non-data-channel interference-cancellation technique on the interfering link signal.

35 . The method of claim 31 , wherein performing said interference cancellation on the interfering link signal comprises generating an interference-cancellation signal according to an interference-cancellation technique and incorporating information of the interference-cancellation signal in the received signal, and wherein demodulating and decoding the target link signal is responsive to said incorporating information of the interference-cancellation signal in the received signal.

36 . The method of claim 31 , wherein configuring the receiving device to perform interference cancellation comprises configuring the receiver to receive relevant signals from the network, the relevant signals comprising one or more of signal format information for the interfering link signal, mobile terminal identifier information for the interfering link signal, and control signal contents for the interfering link signal; and wherein performing the interference cancellation comprises obtaining the relevant signals and using the relevant signals to perform interference cancellation on a per-transmit-time-interval basis.

37 . The method of claim 36 , wherein at least a portion of the relevant signals are obtained via assistance information transmitted from an interfering cell.

38 . The method of claim 36 , wherein at least a portion of the relevant signals are obtained via assistance information transmitted from a serving cell.

39 . The method of claim 36 , wherein at least a portion of the relevant signals are obtained via blind decoding performed on an interfering channel signal.

40 . The method of claim 31 , wherein determining that the receiving device is operating in the range-expansion region is based at least in part on evaluating a signal geometry for the target link signal and determining that the signal geometry for the target link signal is less than about −2 dB.

41 . The method of claim 31 , wherein determining that the receiving device is operating in the range-expansion region is based at least in part on determining that the proportion of received interference power generated by a single interfering source exceeds a first predetermined threshold.

42 . The method of claim 41 , wherein determining that the proportion of received interference power generated by a single interfering source exceeds a predetermined threshold comprises determining that

RSCP
1

∑

i
≠
1



RSCP
i

>

τ
1

,

where RSCP i is the received signal code power for cell i, i=1 for the single interfering source, i=0 for the target link signal, and τ 1 is the first predetermined threshold.

43 . The method of claim 31 , wherein determining that the receiving device is operating in the range-expansion region is based at least in part on computing a ratio of the received signal code power (RSCP) for the interfering link signal to a scaled measure of the total received signal power and comparing the ratio to a second predetermined threshold.

44 . The method of claim 43 , wherein determining that the receiving device is operating in the range-expansion region comprises determining that

RSCP
1

(

E

c
,
CPICH

I
or

)


RSSI

>

τ
2

,

where RSCP 1 is the received signal code power for the interfering link signal, RSSI is the total received power,

(

E

c
,
CPICH

I
or

)

is the fraction of transmitted base station power allocated to the common pilot channel, and τ 2 is the predetermined threshold.

45 . A receiver device comprising a receiver circuit configured to receive a target link signal wherein the target link signal is received in a received signal also including an interfering link signal, and further comprising a controller circuit configured to:
control the receiver circuit to perform own-cell and other-cell measurements; d

Assignees

• Ericsson Telefon Ab L M

Inventors

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

Classifications

• H04J11/005 Primary

  of intercell interference · CPC title