8/10/2019 WWRF_CRAN

1/17

ZTEs C-RAN Progress in China

WWRF

8/10/2019 WWRF_CRAN

2/17

Challenges facing by CMCC in Network Evolution

High Opex and CapexHigh Energy consumption

Building Acquisition andconstructions

Challenges in Evolution

NetworkPressures

GPRS EDGE eEDGE

HSDPA HSUPA

HSPA+

MBMS

HSPA

HSPA+

TDD

GSM

TD-

SCDMA

WCDMA

L

T

E

Capacityvs. Quality

Review RAN

Architecture

Dynamic workloadLow BS utilization rate

Interference problem limitsnetwork Capacity

Site density increase due tofast increasing traffic

802.16 e 802.16 m802.16 d

MBMS

cdma 2000

EV-DO

EV-DO

Rev. B

FDD

cdma 1X cdma 2000 EV-DO

Rev. A

8/10/2019 WWRF_CRAN

3/17

C-RAN leverage 4G technology in 2G network

Fixed

Packet Transport

Core Aggregation Access

IPTV

softswitch

Service Server

CATV

GE/

10GE

RNC

GGSN

SGSN

MobileMGW

HLRMSC Serv

er

Internet

8/10/2019 WWRF_CRAN

4/17

Milestones for C-RAN Development

Large ScaleApplication

2011.7 ChangSha Tria

2011.8 BaoDing Trial

Super BBU PoolTechnical MeetingMeeting held withGroup Wireless R&DInstiture, focusing oncentrialization and

Published C-RANV1.0 StandardChina Mobile R&DInstitute heldInternational C-RAN

Forum, issued whitepaper on C-RAN andsigned MoM withIBM, Intel, ZTE, Huawei for stratigiccooperation. ZTE SVPZhao Xian Mingattended the

Specific meeting held forreporting progress to Li YueSpecific C-RAN reportmeeting to Li Yue was heldwhen he was visiting ZTER&D Centre in Sweden. ZTEleading position on high

capacity & less sites wereacknowledged by Li Yue, whoalso asked to acceleratedevelopment of standard andpushed for field trial.

ZhuHai C-RAN Commercial

deployment announcedZhuHai TD C-RAN commercialdeploymentannounced, Group R&DInstitute and Local OpCo heldjoint News Conference at thesite. Senior leaders fromIndustry and InformationDepartment were invited to

attend.

Published C-RAN V2.0

StandardChina Mobile R&DInstitute, together withZTE, IBM, Intel, Ericsson, NSNand Huawei heldInternational C-RAN Forumagain at the 4th Mobile &Internet InternationalConference and MOU was

signed.

Super BBU PoolDeployment

For an area with 568BBU and 2337

RRU, Super BBUPools were used fora commercialnetwork. CAPEX wasreduced 20%+ andOPEX was reduced60%+

2010.1.12 2010.2 2010.4.27 2010.10 2010.11.9 2010.12.15 2011.7

. .

8/10/2019 WWRF_CRAN

5/17

C-RAN Trial Target

CentralizeRingTopology

Cooperative

Radio

Tidal Traffic

MigrationPerformance

Improvement

BBU BBU Pool BBU addition or

deletion without

18 RRUcascaded

C-RAN sitedriver test

C-RAN site

TidalTrafficmigration

Multi RRUin one Cell

Basic

TCO Reduction

Large sitevalidation

Medium site

RRU Environment

Monitoring Equipment

monitoring CPRI Monitoring

resource

Detection ofRing Topologyconfiguration

Detection ofRRU additionor deletion

This functionPerformanceStatisticsreport

Thresholdsetting ofcarrierresource

allocation andrelease Baseband

resourceallocation andrelease

configurationvalidation

PerformanceValidation

Reduceinterferences

Main Targets of this trialMain Targets of this trialMain Targets of this trialMain Targets of this trial

Small sitevalidation

8/10/2019 WWRF_CRAN

6/17

Project Overview - The Covered Area

coverage about 15

km2, mainly

university area

including HuNanNormal University,

ZhongNan

University

Shangyoucun

Library of HunanNormal University

TwilightGarden

South area of HUT

B

C

D

A

TianmashanBBU pool

Fen s old

11 sites, among

them 9 existing

sites,2 new built

sites.

Shenghua apartment

Houhuneighborhood

houses

Jinjianggarden

Jinjiangneighborhood

West Sanqiao

Sunshine garden

8/10/2019 WWRF_CRAN

7/17

Project OverviewNetwork Topology

FengsFengsFengsFengs Old HousesOld HousesOld HousesOld Houses

Jinjiang GardenJinjiang GardenJinjiang GardenJinjiang Garden

Jinjiang NeighborhoodJinjiang NeighborhoodJinjiang NeighborhoodJinjiang Neighborhood

West SanqiaoWest SanqiaoWest SanqiaoWest Sanqiao

Sunshine GardenSunshine GardenSunshine GardenSunshine Garden

South Area of HunanSouth Area of HunanSouth Area of HunanSouth Area of Hunan

HouhuHouhuHouhuHouhu NeighborhoodNeighborhoodNeighborhoodNeighborhood

(new 900M site)(new 900M site)(new 900M site)(new 900M site)ZhengjiawanZhengjiawanZhengjiawanZhengjiawan

Before Swap After Swap

n vers y o ec .n vers y o ec .n vers y o ec .n vers y o ec .

(900/1800M co(900/1800M co(900/1800M co(900/1800M co----site)site)site)site)

Shenghua ApartmentShenghua ApartmentShenghua ApartmentShenghua Apartment

(900/1800M co(900/1800M co(900/1800M co(900/1800M co----site)site)site)site)

Twilight GardenTwilight GardenTwilight GardenTwilight Garden

(new 900/1800M site,(new 900/1800M site,(new 900/1800M site,(new 900/1800M site,

outdoor + indoor distribution)outdoor + indoor distribution)outdoor + indoor distribution)outdoor + indoor distribution)ShangyoucunShangyoucunShangyoucunShangyoucun

Library of Hunan Normal UniversityLibrary of Hunan Normal UniversityLibrary of Hunan Normal UniversityLibrary of Hunan Normal University

(900/1800M co(900/1800M co(900/1800M co(900/1800M co----site))site))site))site))

Xinmin Rd.Xinmin Rd.Xinmin Rd.Xinmin Rd.

Tianmashan BBU CabinetTianmashan BBU CabinetTianmashan BBU CabinetTianmashan BBU Cabinet

8/10/2019 WWRF_CRAN

8/17

Fiber Connection - 18 Levels RRU Daisy Chain

TianbaoShan BBU

Central Office BBU2

18 RRU daisy chain

18 RRU

Site NameConfiguratio

n900MRRU

1800MRRU

Total

Houhu

neighborho

od

900M 7/7/7 3 0

18Shenghuaapartment

900M 8/6/8

3 81800M

8/8/8/8/8

South areaof HUT

900M 8/63 1

1800M 6

Access Loop BAccess Loop BAccess Loop BAccess Loop B is 18 level RRU daisy chainis 18 level RRU daisy chainis 18 level RRU daisy chainis 18 level RRU daisy chain

the basestation function and Delaythe basestation function and Delaythe basestation function and Delaythe basestation function and Delay

compensationcompensationcompensationcompensation test is passed in this test.test is passed in this test.test is passed in this test.test is passed in this test.

Access Loop BAccess Loop BAccess Loop BAccess Loop B is 18 level RRU daisy chainis 18 level RRU daisy chainis 18 level RRU daisy chainis 18 level RRU daisy chain

the basestation function and Delaythe basestation function and Delaythe basestation function and Delaythe basestation function and Delay

compensationcompensationcompensationcompensation test is passed in this test.test is passed in this test.test is passed in this test.test is passed in this test.

n ou u

neighborhoodsite

4 RRU in South

area of HUTOSS configurationInterface

OSS configurationInterface

11 RRU inShenghua

apartment site

8/10/2019 WWRF_CRAN

9/17

Ir Interface Direct Fiber ConnectionIr Interface Direct Fiber Connection

Just a pair of fibers can be realized GSM C-

RAN.

Quantity of Twin-core fiber is the same as the

traditional fiber transmission solution.

Support 60 Km distance, can meet the

requirement of different scenario.

Access Ring

of Fiber

CentralizedBBU Pool

6G White Fiber is used in Changsha GSM C-RAN trial.

Compared with the Tradit ional networking which is SDH access ring, still need only one

pair fibers for connecting the same quantity of site, no need to change the transmission

archetecture

8/10/2019 WWRF_CRAN

10/17

RRU Ring topologyRRU Ring topology

Total 108 carriers sector share the BBU

resource

Ring topology can support high

availability of serivice.

Automatical switch while the link is

brokean or one RRU is down

Swithch time : 136ms

During the link switch, service is not

interrupted

8/10/2019 WWRF_CRAN

11/17

Effective Baseband Dynamic managementEffective Baseband Dynamic management

Peak traffic is 159Erl at 22:00, andthe allocated baseband resource ofBBU is 62 which is also maximum.

Lowest traffic is 0.37 Erl at20

30

40

50

60

70

80

40

60

80

100

120140

160

180

CS Traffic in busy hour(erl) Allocated Baseband Resource

In traditional network-mode, the baseband and RF resources is 1:1 mapping, with

resource can not be fully utilized.

In C-RAN, baseband resources are allocated according to traffic, high traffic with more

allocated resources, low traffic with less allocated resources. So the resource resource

utilization rate is much higher.

: , an t e a ocate

baseband resource of BBU is23 which is also the minimum.

00

9:00

10:00

11:00

12:00

13:00

14:00

15:00

16:00

17:00

18:00

19:00

20:00

21:00

22:00

23:00

0:00

1:00

2:00

3:00

4:00

5:00

6:00

7:00

8:00

8/10/2019 WWRF_CRAN

12/17

8/10/2019 WWRF_CRAN

13/17

Multi-RRU for one cell for coverage reshaping

Multi-RRU in one logic cell , cover different areaTechnicl

Implementation

Principle

Reshaping increasesdownlink coverageand improves uplink

reception

OriginalNew Combined Cell

Use nearby existing sites, reshapingthe coverage at the targeted area, thisreduces the requirement for new sites at weak coverage area.

C-RAN architecture can make flexible site type adjustment, allocate power accordingto requirement and realize seamless coverage.

Cooperative planning, traffic balancing, avoiding network congestion.

Multi RRUs forming a logical cell can simplify network structure, reducehandovers and improve network quality.

escr p on

TechnicalValue

ReuseExisting

site

8/10/2019 WWRF_CRAN

14/17

Suburban Wide Area Coverage

Picture of Current Network Site

Multi layer reshapingthrough

using multi RRUs to form a logical cell

to increase the cell coverage radius.

Multi layer reshapingthrough

using multi RRUs to form a logical cell

to increase the cell coverage radius.

Handover reduced 50% . Traffic increased by 40%

Coverage

ratio

Voicequality

Ratio ofHO

coding

BeforeAfter

8/10/2019 WWRF_CRAN

15/17

Residential Area Coverage

1 RRU connected to the disguisedantenna, covering the main road by the river

2 RRUs connected to the disguised antenna, covering theresident-ial area, one of the RRU forming a logical cell

with an indoor RRU

3 RRU mounted on the top of the building forindoor coverage

Using indoor distributed system and ceiling mountedantennas for underground garage coverage

Since indoor RRUs and outdoor RRUs forming onelogical cell, through cooperation among RRUs no

handover will happen when getting into and comingout from underground garages, lifts and flats.

Number ofhandovers in a cell

Number ofhandovers in a cell

Average MOSvalue

Average MOSvalue

UL RQ0-3 improves 1%

DL RQ0-3 improves 2.5%Without multi RRUsforming a logical cell

Multi RRUsforming a logical cell

Without multi RRUsforming a logical cell

Multi RRUsforming a logical cell

Average ratiofor UL RQ0-3

Average ratiofor DL RQ0-3

8/10/2019 WWRF_CRAN

16/17

Network Performance Improvement - CQT

Data service quality also improvedgreatly, FTP download rate increased by26.7%

Ring C

CELL CIFTP Download RateKbps

Before Swap After Swap

Fengs old houses ZG-1 36781 104.33 120.17

Fengs old houses ZG-2 36782 143.59 135.56

Fengs old houses ZG-3 36783 85.62 145.6

Jinjiang neighborhoodZD-1

35401 121.15 123.28

Jinjiang neighborhoodZD-2

35402 121.65 145.9

Jinjiang neighborhood

Impro

ZD-3. .

Sunshine garden ZG-1 42071 98.24 116.6

Sunshine garden ZG-2 42072 63.32 157.37

Sunshine garden ZG-3 42073 132.12 135.43

West Sanqiao ZG-1 25151 126.4 168.23

West Sanqiao ZG-2 25152 113.45 124.2

West Sanqiao ZG-3 25153 125.87 178.45

Jinjiang garden ZG-1 54651 117.68 156.2

Jinjiang garden ZG-2 54652 130.2 171

Jinjiang garden ZG-3 54653 108.76 148.79

vedsignifican

tly

8/10/2019 WWRF_CRAN

17/17

Summary

With C-RAN , CAPEX saving27.1% , OPEX saving 63.9%

Performanceimproved , download speedincreased 26.7% , voice qualityimproved .

And its a future prove , greennetwork .