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● Most sites are deployed with secondary fiber for future capacity.● All that is needed is an additional BBI card (slot 2).● Secondary fiber can also be helpful if a bad fiber run is encountered.
Expedience Co-existence
● On overlay including the Seattle market, it is very important to check Wimax and Expedience noise floor for potential interference.
● Take Expedience baseline noisefloor prior to maintenance window.● After Wimax is transmitting, measure Expedience and Wimax noisefloors for
interference.● Have had interference caused by bad jumpers.
X 4
Antenna & Diplexer Cut
● What are they doing?○ Overlay markets.○ Field tech and tower crew on site.○ New Wimax RF cabling installed to new diplexers (channel combiners).○ Existing expedience RF cabling connected to diplexers.○ New quad port antenna installed. Expedience and Wimax share it.○ Wimax powered up.○ Check installation for interference and reflection.
Wimax High-level Network Architecure
Nodes● BS - Basestation, radio access point.● ASN – central control for data plane, mobility, authentication, QoS, accounting, packet inspection, and more.● AAA – Provisioning, authentication and accouting store, and proxy to external AAAs (Sprint).● DHCP – IP assignment.
Interfaces● R1 – air interface● R2 – logical interface from MS to CSN (authentication, QoS)● R3 – ASN to CSN● R4 – inter-ASN (we don’t have yet)● R5 – inter-CSN (pseudo with Sprint)● R6 – BS to ASN (mobility signaling)● R8 – BS-to-BS (mobility handovers)
Wimax Network Profile C
● Standardized R1, R2, R3, R4, and R6 interfaces.● Standardized, open architecture allows theoretical “plug-n-play” of equipment. ● Profile B – only R4 and R3 open. (Motorola)● Profile A – similar to C, but some radio resource control is done by ASN.
Site Commissioning Overview
Data Planning
Site Construction
Offline ATP
Network Commissioning
Online ATP
Backhaul Established
Network Optimization
Commercial Ready
IP Plan uploaded to Portal. – Network EngineeringRF Plan uploaded to Clearvision. – RF Engineering
Site is constructed. BBU and RRUs installed. – Field Ops
Basic validation for hardware installation. – Field Ops
Integrate site into network. BS receives commercial configuration and is managed by the M2000. Provisioned into the ASN. – LV Commissioning
Validate commercial parameters, network entry, mobility, throughput. – Field Ops
Scan and HO triggers, neighbors are adjusted for optimal mobility performance. – RF Engineering
Augments, too.
Validate Network Entry and Throughput Performance (Field Ops)
● For each of the sectors validate network entry and throughput performance near cell-core.
● RF Engineering requires data as input to form as well as a screen capture of the speed test.
Validate Coverage and Key Airlink Parameters (Field Ops)
● Verify sector RF parameters: frequency, BSID, and sector azimuth.● Verify coverage by driving from cell-core to cell-edge.● Use WiTT to log data. Provide CSV drive test files to RF engineering.
Validate Intra-Sector Handovers (Field Ops)
● Drive a circular route to validate intra-sector handovers.● Use WiTT to log data. Provide CSV drive test files to RF engineering.
● All data is entered into the ATP form and sent to RF engineering for approval.
RF Planning and Optimization
● For a site to be commissioned, the following must be uploaded to Clearvision by RF Engineering:
○ Frequencies – You should know this. ○ BSID – Basestation ID. Actually applies to each carrier. It’s a globally unique identifer for a
carrier. Contains Clearwire network, market, basestation, sector, and carrier identifiers.○ Preambles – Local carrier/cell ID that is also used for PHY frame synchronization, power
measurement, and mobility.○ Neighbors – Adjacent carriers/cells to handover to and from.○ Triggers – Scan triggers and handover (HO) triggers to support mobility.○ Paging Group – Carrier/cell grouping to support idle mode of devices.○ Number of Carriers – Plan the number of carriers needs for capacity required.
● For cluster optimization, RF engineering adjusts the following for optimal mobility performance:
○ Handover triggers – Minimize ping-ponging and drops.○ Scan triggers – Minimize scanning time as much as possible.○ Neighbors – Keep neighbors lists as small as possible.
Huawei M2000 EMS Installation
● Huawei EMS installation: http://<EMS IP>/cau/ (May be different for each market)
● Configuration -> Wimax Enhanced Configuration.● View and export software and hardware configuration.
MML Commands
● Maintenance -> MML Command.● Huawei’s command line interface for the BTS.● Some commands are restricted.
Real-time Subscriber Signal and MAC Tracing
● Monitor -> Trace Collection Management.
Real-time Performance Monitoring
● Monitor -> Performance Monitor.
Performance History
● Performance -> Query Result.
Performance History with Spotfire
● Metrics retrieved from the M2000 into the Spotfire reporting system.● Various reports are available for Huawei, Motorola, and Samsung.● Calvin is point of contact.
Alarms
● Monitor -> Current Fault Alarms
Adjusting Neighbors, Scan Triggers, and HO Triggers for Optimization
● Changes can be made real-time without disabling sectors or rebooting site.● Adjustments performed through MML commands:
○ Scan Trigger ■ LST TRIGGER■ MOD TRIGGER
○ HO trigger ■ LST TRIGGER■ MOD TRIGGER
○ Neighbors ■ LST NBR■ RMV NBR■ ADD NBR
Site Retune
● Site retunes are performed to change frequency, preamble, and permbase.● This change does require disabling carriers and will require a MOP of market
is commercial.● A short MML script is executed that “blocks”, makes changes, and then
unblocks.● If error is made, the original configuration can be restored.