5 LTE ERAN6.0 Compact Bandwidth Feature ISSUE 1.00

0

Page0Revision RecordDont Print This PageCourse CodeProductProduct VersionCourse Version ISSUEOEO107200LTEeRAN3.01.00

Developer/ModifierTimeApproverNew/UpdateYuan Shuai 2013- 5Zhu DianrongUpdate from eRAN3.0

Copyright 2013 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

:30-32pt : R153 G0 B0:

:20-22pt (2-5) :18pt : :FrutigerNext LT Regular : Arial

:18-20pt(2-5):18pt ::

13

.

LTE eRAN6.0 Compact Bandwidth FeatureConfidential Information of Huawei. No Spreading Without Permission

LTE eRAN3.0 Compact Bandwidth

www.huawei.comCopyright 2013 Huawei Technologies Co., Ltd. All rights reserved. :40-47pt :26-30pt: :FrutigerNext LT Medium : Arial

:35-47pt: :24-28pt::


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.

LTE eRAN6.0 Compact Bandwidth Feature Confidential Information of Huawei. No Spreading Without Permission

ObjectivesUpon completion of this course, you will be able to:Describe the benefit of compact bandwidth Describe the key technologies of compact bandwidth Describe related physical resource management schemePage2


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


ContentsOverview Key Technologies Related Physical Resource Management Page3


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Benefit of Compact Bandwidth During G/L refarming, operator may face the problem that the bandwidth for LTE is not exact equal standard bandwidthDeploy LTE systems under non-standard bandwidths ,make full usage of frequency resource This feature is fully comply with 3GPP R8&R9 and its transparent to UE without any special requirements of UEPage4


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.

LTE specifications define only six standard frequency bandwidths: 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz. However, in some countries, operators may acquire non-standard bandwidths. Huawei eNodeBs support the compact bandwidth feature to enable operators to deploy LTE systemsLTE eRAN6.0 Compact Bandwidth Feature Confidential Information of Huawei. No Spreading Without Permission

Application Scenarios This feature is only valid for the following scenarios:Now only for Band 3 (1800MHz)The standard bandwidth configuration should be 5MHz, 10MHz, 15MHz and 20MHzWith 5MHz standard bandwidth configuration, the actual bandwidth can be 4.8 ~ 4.9MHz With 10MHz standard bandwidth configuration, the actual bandwidth can be 9.6 ~ 9.9MHzWith 15Mhz standard bandwidth configuration, the actual bandwidth can be 14.6 ~ 14.9MHzWith 20MHz standard bandwidth configuration, the actual bandwidth can be 18.3 ~19.9MHzPage5


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.

3GPP defines the 1800 MHz band as band 3 in which LTE networks can operate. However, this band is currently used by GSM networks. To deploy an LTE network in this band, refarming is performed on the spectral resources used by GSM networks or all the spectral resources in this band. During the refarming, the GSM networks release the resources in units of carriers (200 kHz per carrier), and the released resources may not be standard operating bandwidths (1.4, 3, 5, 10, 15, or 20 MHz) for LTE.LTE eRAN6.0 Compact Bandwidth Feature Confidential Information of Huawei. No Spreading Without Permission

Feature EnableCheck the license support DSP LICENSE Configure both standard and non-standard bandwidth within the range MOD CELLPage6


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.

To enable this feature, you need:Check the eNodeB license to see if this feature is support or notEnable the customized bandwidth configuration and configure the actual bandwidth within the rangeLTE eRAN6.0 Compact Bandwidth Feature Confidential Information of Huawei. No Spreading Without Permission



:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Solutions for Compact Bandwidth Reduce guard bandwidth: Sharper filter Reduce effective bandwidth: Compact RB

Page8Sharper Filter

1MHzEffective BW18 MHz(100RB)1MHzLTE BW 20MHz

0.65MHzEffective BW18 MHz(100RB)0.65MHzLTE BW 19.3MHz

0.65MHzEffective BW16.92 MHz(94RB)0.65MHzLTE BW 18.22MHz

Compact RB + Sharper FilterStandardCompact guard band


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Reduce Guard BandwidthReduce the standard guard bandwidth based on stringent filter, up to 40% guard bandwidth can be compact.It allows the guard bandwidth is less than 10% which is specified in 3GPP No effect on available RB numberIt is applicable only in scenarios where an operator's non-standard bandwidth is slightly smaller than a standard bandwidth.

Page9Standard BWGuard band20MHz1 MHz on each side15MHz 0.75MHz on each side10MHz 0.5MHz on each side5MHz 0.25MHz on each side


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Reducing Effective BandwidthPunctured some RB one the each side bandAfter compact RB, it need the some especial algorithms and limitations on resource assignment and channel managementPCFICH and PHICH resource allocationPDCCH resource allocation and power controlPDSCH resource allocation PUSCH resource allocation

Page10


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.

The technique of reducing effective bandwidths configures a standard bandwidth for a non-standard bandwidth. Constraints are imposed on the standard bandwidth and some RBs on the standard bandwidth are punctured, confining data transmission to the non-standard bandwidth. This technique has a broader use than the technique of reducing guard bandwidths.


Solutions for Each ScenariosBandwidth Solution Available RBGuard band4.8 ~ 4.9 MHzAll consider as 4.8 MHz Use 5MHz sharp filter 25 (No compact)0.15 MHz each side 9.6~9.9 MHzAll consider as 9.6MHzUse 10MHz sharp filter50 (No compact)0.3 MHz each side 14.6~14.9MHzAll consider as 14.6MHz Use 15MHz sharp filter75 (No compact)0.55 MHz each side18.3~18.5MHzAll consider as 18.22MHzUse 20MHz sharp filter plus compact RB 92 ( Puncture 8 RB) 0.65MHz each side18.6~ 18.9MHzAll consider as 18.58MHzUse 20MHz sharp filter plus compact RB94( Puncture 6 RB) 0.65MHz each side19~19.2 MHz All consider as 18.94MHz Use 20MHz sharp filter plus compact RB 96 (Puncture 4 RB)0.65MHz each side19.3~19.9MHzAll consider as 19.3MHzUse 20MHz sharp filter100 (No compact)0.65MHz each side

Page11


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.




:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Impact of RB CompactUnder compact bandwidths, to reduce performance loss caused by RB puncturing, eNodeBs adjust related resource management algorithms for physical channels. The adjustment prevents allocating punctured RBs to channels. This algorithm involves both DL and UL channel

Page13


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Impact on PCFICH AllocationAvoid allocate the PCFICH on the punctured RBPCFICH allocation is related with PCI configuration, so some PCIs will be limited for configuration

Page14

The following PCI cant be used for compact RB scenarios:0~7, 471~511


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Impact on PHICH Allocation Avoid allocate the PHICH on the punctured RBThe PHICH group number is limited, with Ng configurationThe Ng cant be 2Page15


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Impact on PDCCH AllocationUnder compact bandwidths, PDCCHs for some UEs may be transmitted on punctured RBs, resulting in deterioration in PDCCH demodulation performance. To improve the performance, the following methods are available:Raising the CCE aggregation level for PDCCHsIncreasing the transmit power of PDCCHs based on the number of punctured resource element groups (REGs)

Page16


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Impact on PDSCH AllocationUnder compact bandwidths, PDSCH resource allocation operates in the same way as that under standard bandwidths, though the number of RBs available for each PDSCH decreases with the total number of available RBsPage17


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Impact on PUCCH&PUSCH AllocationPUCCH: Under compact bandwidth, the PUCCH is allocated more RBs than those under the standard bandwidth. Only the PUCCH on RBs that are close to the center of the frequency band can be allocated to UEPUSCH: Under compact bandwidths, PUSCH resource allocation operates in the same way as that under standard bandwidths, though the number of RBs available for each PUSCH decreases because the PUCCH is allocated more RBs than those under the standard bandwidth.

Page18

PUSCHPUCCHPUCCH

PUSCHPUCCHPUCCH

Standard bandwidthCompact RB

Available PUCCH

unavailable PUCCH


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Impact on PRACH AllocationA PRACH occupies six RBs and is adjacent to a PUCCH in the frequency domain. The compact bandwidth feature has no impact on the PRACH.

Page19


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Impact on CQI ReportUnder a compact bandwidth, UEs have no knowledge about the number of punctured RBs and therefore measure wideband reference signals (RSs) over the entire related standard bandwidth. The measurement covers the punctured RBs. However, eNodeBs do not transmit RSs on punctured RBs. As a result, the following errors occur: The wideband SINR measured by UEs is lower than the actual SINR, which impact on CQI report value. CQI adjustment algorithm could be used to compensate it. Page20


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.

SummaryBenefit of compact bandwidthSolution of compact bandwidthImpact on physical channel management

Page21


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.


Abbreviation PCFICH: Physical Control Format Indicator Channel PDCCH: Physical Downlink Control Channel PHICH: Physical HARQ Indicator ChannelPUCCH: Physical Uplink Control Channel PUSCH: Physical Uplink Shared Channel Page22


:30-32pt : R153 G0 B0:


:18-20pt(2-5):18pt ::

13

.

Thank youwww.huawei.com


Format 0

Format 1

Format 2

Format 3

CP

Zadoff Chu Sequence

6 PRB

Subframe 1ms

Subframe 1ms

Documents

5 LTE ERAN6.0 Compact Bandwidth Feature ISSUE 1.00