eran 800 mhz self interference cancellation

7/21/2019 ERAN 800 MHz Self Interference Cancellation

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eRAN

800 MHz Self interference CancellationFeature Parameter Description

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$ *ntro"uction

$.$ Scope

This document describes the *++ H- selfinterference cancellation feature in terms of how it wors,

how it relates to other features, and how it affects the networ. This document also pro"idesengineering guidelines for this feature.

!ny managed ob(ects /0s1, parameters, alarms, or counters described in this document correspondto the software release deli"ered with this document. &n the e"ent of updates, the updates will bedescribed in the product documentation deli"ered with the latest software release.

$.# *nten"e" Au"ience

This document is intended for2

Personnel who need to understand the *++ H- selfinterference cancellation feature

Personnel who wor with Huawei Long Term )"olution /LT)1 products

$.% Change History

This section pro"ides information on the changes in different document "ersions.

There are two types of changes, which are defined as follows2

Feature change2 refers to a change in the *++ H- selfinterference cancellation feature of a specificproduct "ersion.

)ditorial change2 refers to a change in wording or the addition of information that was not describedin the earlier "ersion.

+ocu'ent *ssues

The document issues are as follows2

+3 /3+4343351

+4 /3+43+66+1

Draft ! /3+43+44+1

0# ,#0$#-$#-#/

Compared with issue +4 /3+43+66+1 of e7!N6.+, issue +3 /3+4343351 of e7!N6.+ incorporates thefollowing changes.

Change Type Change +escription )ara'eter Change

Feature change None None

)ditorial change 7e"ised chapter 6 $TechnicalDescription.$

None



0$ ,#0$#-0%-%0/

This is the first official release.

Compared with draft ! /3+43+44+1 of e7!N6.+, issue +4 /3+43+66+1 of e7!N6.+ incorporates thefollowing changes.

Change Type Change +escription )ara'eter Change

Feature change None None

)ditorial change 7e"ised chapter 8 $)ngineering 9uidelines.$ None

+raft A ,#0$#-0$-$0/

This is a draft.



% Technical +escription

*++ H- selfinterference is the interference that a #)<s signal transmission induces on the #)<s signalreception /that is, uplintodownlin interference1 in a cell that operates in the *++ H- fre;uencyband. %elfinterference is restricted by the secondorder intercept point /&P31 of the #) and the narrow

duple' fre;uency separation of the *++ H- fre;uency band. &t mainly consists of intermodulation /&1interference, including &3, &6, &>, and &:, which correspond to & orders. The strength of selfinterference is determined by the #)<s transmit power and intermediate fre;uency /&F1 performance,mainly referring to the duple' fre;uency separation and nonlinear power amplifier.

& interference occurs when two or more interfering signals reach a #)<s recei"er at the same time. The fre;uencycombination of these interfering signals is close or e"en identical to the fre;uency of a wanted signal because the poweramplifier of the #) is nonlinear. !s a result, the #) cannot filter out these interfering signals, and these signals interferewith wanted signals. Different fre;uency combinations cause different & interference.

The impact of *++ H- selfinterference "aries according to the bandwidth2

! cell with a > H- bandwidth has a wide fre;uency separation, and therefore the impact of selfinterference caused by a narrow duple' fre;uency separation is small enough to ignore.

! cell with a 4+ H-, 4> H-, or 3+ H- bandwidth has a narrow fre;uency separation andtherefore selfinterference e'ists. Downlin P7=s at any positions in the spectrum may e'perienceinterference from the uplin. ?hen the #) is not tolerant of the interference, *++ H- selfinterference cancellation is re;uired.

! cell operating in the *++ H- fre;uency band /band 3+1 does not support a 4.@ H- or 6 H- bandwidth, according to69PP specifications.

!ssume that a #) in a cell with a bandwidth of 3+ H- is allocated >+ P7=s for uplin transmission. &nthis case, the start position of uplin P7=s is at *68.> H- /*64 H- A 3> ' 4*+ H- B *68.> H-1.Then, the red cur"e in Figure 64 represents selfinterference.



1igure %-$ %elfinterference in the *++ H- fre;uency band

Figure 64 is only a schematic diagram because the result is obtained without the duple'er<s suppression.

*++ H- selfinterference cancellation is controlledby *'*cSwitch,*'*cSwitch/ under CellAlgoSwitch.UlSchSwitch. &f *'*cSwitch,*'*cSwitch/ isselected, the eNode= mitigates selfinterference and increases downlin capacity by limiting thenumber of allocated uplin P7=s.

eran 800 mhz self interference cancellation

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