BTS resources.NSN 3G

Subunits

Subunits (SU) is a hardware part which compute• R99 traffic (licensed by “R99 Channel elements” feature)• HSDPA traffic (licensed by “HSDPA processing set” features)• HSUPA traffic (licensed by “HSUPA processing set” feature)• CCCH traffic (licensed by “CCCH processing set” feature)

FSMF system module

FSMF include 5.5 SU:• 1.125 SU are dedicated for HSDPA• 4.375 SU are dedicated for R99, HSUPA

1 SU compute 96 CE => 420 CE is maximum of WBTS capacity. But it can be reduced.

1 SU½ SU

4.375 SU for R99, HSUPAMax CE capacity – 420 CE (4.375 SU x 96 CE)

1.125 SU for HSDPA

1 SU 1 SU 1 SU 1 SU

FSMF system module

FSMF include 5.5 SU:• 1.125 SU are dedicated for HSDPA• 3.875 SU are dedicated for R99, HSUPA plus (for example)• 0.5 SU for 1 additional CCCH processing set due to increased “cell

range”

3.875 SU for R99, HSUPACE capacity – 372 CE (3.875 SU x 96 CE)

1.125 SU for HSDPA

0.5 SU for add. CCCH

1 SU½ SU1 SU 1 SU 1 SU 1 SU

Cell rangeWCEL parameter which • blocks call attempts behind it’s value• reduce max available CE by means of• increasing usage of SU for CCCH processing

Allocation table

Example:WBTS 2/2/2, Cell range = 35 km for each carrierÞ Cell range of WBTS = (2+2+2)*35

km = 210 kmÞ Max available CE will be reduced

to 372 CE

Cell range of WBTS

Max available CE

# of avail SUfor R99&HSUPA

# SU for add. CCCH

0 ≥ CRange <192 km 420 4.38 0

192 ≥ CRange < 224 km 372 3.88 0.5

224 ≥ CRange <256 km 324 3.38 1

256 ≥ CRange <288 km 276 2.88 1.5

288 ≥ CRange <320 km 228 2.38 2

Routine troubles

Traffic increasin

g

Moving high speed HSPA data traffic to low speed R99 data

traffic

Shortage of CE for HSUPA

traffic

100% CE utilization of HSUPA traffic

100% CE utilization of R99

traffic

100% subunit (SU)

utilization

Block packet traffic

attempts

Decreasing of DCSR

Solution is increasing SU capacitySubmodule FBBA• adds 6 SU to FSMF capacity• maximum is 2 items

2 FBBA: 16.375 SU for R99, HSUPA . Max CE capacity – up to 1572 CE 1 FBBA: 10.375 SU for R99, HSUPA .Max CE capacity – up to 996 CE

1.125 SU for HSDPA

1 SU½ SU1 SU 1 SU 1 SU 1 SU

1 SU 1 SU 1 SU 1 SU 1 SU 1 SU

1 SU 1 SU 1 SU 1 SU 1 SU 1 SU

FSMF

FBBA 1

FBBA 2

Contacts

Evgeny DegtyarevRAN engineer

https://linkedin.com/in/edegtyarevmob.: +7 902 252 59 71 (GMT+2)

https://linkedin.com/in/edegtyarev

Relocation to Europe is welcome =)

Thank you for your attention!