Small and Macro Cell deployment Mobile Operator- A case Study. Anil K Reddy Director BD APAC
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1 Small and Macro Cell deployment Mobile Operator- A case Study Anil K Reddy Director BD APAC areddy@advaoptical.com
2 Why Small cells? While Small cells are not new to mobile world, LTE is an indispensable driver for small cells mainly due to its spectral efficiency today and tomorrow (LTE-Advanced). Small cells key purposes: Increasing capacity and Coverage in areas with high user densities, mostly in (indoor) public places in dense urban areas and inside buildings with a high subscriber density Reutilization of spectrum, Improving throughput, data rates and service quality in important, user-dense, marginal-coverage areas that cannot be adequately reached by macro cells both outdoors and indoors Extending handset battery life since higher-order modulations, broader bandwidth, MIMO, and enhanced processor power all drive up handset power consumption while smaller cells reduce power consumption 2
3 Timing requirements for Small and Macro cell The demands for timing is clearly evident Network operators typically mandate tighter timing requirements for public access small cells much stringent than the standards demand and better than often specified for residential femtocells. The 250ppb limit for 3G femtocells is often tightened to the 50ppb used in macrocells. LTE-FDD requires 16ppb frequency tolerance on the transport. LTE-TDD requires phase alignment as well as frequency accuracy, with a tolerance of 1.5uS. Specific LTE-Advanced features, such as Co-Ordinated Multi-Point (CoMP), require phase alignment of 0.5uS. 3
4 Common Considerations for Small Cell Sync a) GPS: Best for frequency and phase, comes with its own challenges of Cost, Vulnerability, LoS in indoor and outdoor small cells. b) SONET/SDH: Reliable model but is in phase out mode - Support frequency only. c) Synchronous Ethernet (SyncE): Good Frequency distribution model, (donot support phase) synchronisation. Challenge in Heterogeneous network d) NTP (Network Timing Protocol), The low cost solution is attractive. Challenge to offer highly accurate phase requirements. e) Precision Time Protocol (PTP) IEEE 1588v2: A packet timing scheme provides both accurate frequency and phase timing. Probably the best and low cost solution for both Macro and Small cell when combined with Sync E provide the below benefits. 4 Accuracy Holdover time:. Resiliency Cost: Operational Flexibility
5 Topology Small cells Sync Core Aggregation Grand Master Level-3 Aggregation 1 PPS + 10 MHz + ToD Access Grand Master (PRTC) GM GNSS antenna Level-2 Aggregation PTP_TC Switch PTP_BC PTP_BC M M S OC_S PTP_BC Access Ring S M Core /Access PTP unaware Network Small Scale GM Grand Master on SFP Grand Master on SFP OC_S 5 OC_S PTP_TC Switch OC_S OC_S
6 Sync Probing and Assurance Several layers of indicators allowing for step by step monitoring and troubleshooting First layer provides global indication of the Synchronization status Second layer shows performance indication of each reporting tool Third layer provides detailed information for fault localization of performance analysis 6
7 Salient features implemented Access Grand Master approach APTS implemented for resiliency. Asymmetric Delay Compensation. BMCA Implementation Better Holdover achievement on SYNC-E and APTS Sync probing and assurance Multiple profiles implemented on the same GM. Frequency profile for FDD based Small Cells Phase Profile ( Default phase now and in preparation) Translation of Frequency profile to Default Phase profile and vice versa Non Standard implementation. 7
8 Small Cell Sync Frequency based
9 Access Grandmaster at First Aggregation G GNSS Grand Master CEN Network SDH Network 9
10 Customer challenges and a working solution Customer Challenge: Customer was using Sync-E in their CEN (carrier Ethernet Network) network to Synchronize the 3G Small cells There are few locations where they do not have CEN presence, where it becomes very difficult to provide Sync Agreed Deployment Plans A) Edge GM at the Access 1) Placing an Access GM at the EoSDH access network. 2) The edge GM will provide G Sync to the connected small cells 3G Small cells B) Access GM at the aggregation 1) Placing Access GM at the CEN aggregation location. 2) The Access GM will serve all the 3G small cells which are aggregated and backhauled through EoSDH network. 10
11 Solutions for 4G Small cell connectivity over Copper (SHDSL.bis Technology) 11
12 Phase Sync for 4G small cells over Copper Grand Master PTP from mini GM CEN Network XDSL SHDSL.bis XDSL enode-b 12
13 Customer challenges and working solution Customer s Challenge: No fiber access to all Small Cell locations. Prefer to use the existing copper infrastructure in the ground Hence, they are forced to look for some solution to serve the small cells using copper pairs to roll out the services at a faster manner Solution: 1) Access Grandmaster at the DSL POP location 2) Ethernet multicast profile as the small cells 3) PTP VLAN Flow tag PTP packets on a specific VLAN 4) XDSL modems which are used between the POP and the cell site will prioritize the PTP traffic using the VLAN marked by the Grandmaster 13
14 Questions? Thank you! IMPORTANT NOTICE The content of this presentation is strictly confidential. ADVA Optical Networking is the exclusive owner or licensee of the content, material, and information in this presentation. Any reproduction, publication or reprint, in whole or in part, is strictly prohibited. The information in this presentation may not be accurate, complete or up to date, and is provided without warranties or representations of any kind, either express or implied. ADVA Optical Networking shall not be responsible for and disclaims any liability for any loss or damages, including without limitation, direct, indirect, incidental, consequential and special damages, alleged to have been caused by or in connection with using and/or relying on the information contained in this presentation. Copyright for the entire content of this presentation: ADVA Optical Networking.
15 Small Scale GM Protection How can the Small Scale GM be protected against local GNSS outage? Secondary sources 1. Sync-E (time holdover) for core network or adjacent PTP GM 2. PTP input (Slave) locked to core or adjacent PTP GM (APTS) Can be used as secondary frequency and/or time source 15
16 Business Case - Small Scale GM Vs. GNSS everywhere Cost High GNSS everywhere PTP full on path support everywhere Low Small Scale GM PTP Support Only one GNSS antenna is needed every N base stations (I.e. N=4..64) (Cost of small scale GM divided by N + one antenna installation) << ( N x Cost of GNSS antenna installation ) 16
17 Questions? Thank you! IMPORTANT NOTICE The content of this presentation is strictly confidential. ADVA Optical Networking is the exclusive owner or licensee of the content, material, and information in this presentation. Any reproduction, publication or reprint, in whole or in part, is strictly prohibited. The information in this presentation may not be accurate, complete or up to date, and is provided without warranties or representations of any kind, either express or implied. ADVA Optical Networking shall not be responsible for and disclaims any liability for any loss or damages, including without limitation, direct, indirect, incidental, consequential and special damages, alleged to have been caused by or in connection with using and/or relying on the information contained in this presentation. Copyright for the entire content of this presentation: ADVA Optical Networking.
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