Nokia Dynamic Abis solution Harry Kuosa EDGE Marketing Manager Nokia Networks Nokia Dynamic Abis is a non-blocking and real time transmission solution to maximally optimize EDGE and GPRS traffic in Abis Higher EDGE air interface bit rates require up to 5 fold Abis capacity Coding scheme Bit rate (bps) CS-1 8,0 GPRS CS-2 12,0 and CS-3 14,4 EDGE CS-4 20,0 MCS-1 8,8 MCS-2 11,2 MCS-3 14,8 MCS-4 17,6 EDGE MCS-5 22,4 MCS-6 29,6 MCS-7 44,8 MCS-8 54,4 MCS-9 59,2 Abis PCM allocation (fixed + pool/slave) Higher data rates dont fit in 16 kbit/s channels 32, 48, 64 or 80 kbit/s Abis links needed Fixed Abis may require 3 times more capacity than Nokia Dynamic Abis Nokia Dynamic Abis Fixed Abis solution 0 Fixed 12 voice chs 3 and data 5 master chs 67 8 9 10 11 12 13 14 15 16 21 Simple 22 23compact 25data slave chs 26 EDAP POOL 27 28 29 30 31 TSL 0 TSL 0 TRX 1 FixedTRX 2 voice TRX 3 chs TRX 4 FixedTRX 5 data TRX 6 chs EDAP 9 TSL Nokia Dynamic Abis enables higher EDGE bitrates with less Abis capacity due to EDAP Pool One master channel as today for voice and data, no blocking 0 introduced 2 For higher data rates additional 16 kbps slave channels are 3 always allocated as required by the MCS from the EDAP pool 45 Each master timeslot can use individual 16 kbps slave 6 timeslots from the EDAP. However when a master timeslot 7 needs more than one slave timeslot then the consecutive slave timeslots are always reserved EDAP resources are reserved when TBF data transfer starts When at the end of data transmission the TBF is released also the allocated channels in the pool are released Maximal utilization of Abis resources, due to fact that Nokia Dynamic Abis does not introduce blocking nor RLC loss 24 25 26 27 28 29 30 31 TSL 0 TRX 1 TRX 2 TRX 3 TRX 4 TRX 5 TRX 6 TRX 7 TRX 8 POOL Real time interaction between Dynamic Abis Resource Manager and Radio Link Adaptation Radio Link Adaptation MCS Real time operation, repeated for every 20ms no period yes Result: No blocking or RLC Loss and Maximal utilization of Abis resources If Reduced MCS is MCS2..MCS8 or CS2..CS3, then inadequate EDAP resource counter is incremented If Reduced MCS is CS1 or MCS1 then no EDAP resource counter is incremented DL RLC retransmission with any MCS or CS need no EDAP resources Maintenance of the TRS lines is easier and cheaper with Nokia Dynamic Abis Typically maintenance effort is directly related to the amount of cross connections and capacity occupied. The Nokia Dynamic Abis pool offers concentration capability that allows reducing the needed capacity compared to fixed Abis -the pool is also compact to manage. This offers direct savings in maintenance effort. The service level and concentration ratio can be selected by the operator -maximized service with minimized cost Dimensioning the Nokia Dynamic Abis EDGE Dynamic Abis Pool (EDAP) is a shared extra Abis resource for EDGE channels based on need EDAP as such does not create blocking (due to fixed master timeslot availability outside EDAP), but non-availability of EDAP resources may cause degradation of the user bit rates Careful dimensioning and follow-up of the usage of the allocated EDAP resources is important Average bit rates -radio effective bit rate per radio TSL Capacity needed in Abis -one Abis PCM throughput -optimised EDAP pool Nokia Dynamic Abis Dimensioning Example Inputs EDGE Territory = 18 Radio TSLs Radio TSL effective Capacity = 30 Kbps (MCS-7) Abis Data Rate Reduction 0.1% 29 30 EDAP Sharing Probability = 77% = > 31 Second Attempt: 21 New EDAP Size = 9 TSLs at 64 kbps. 22 23 24Abis Data Rate Reduction = 0.018 % < 0.1% 25 26 EDAP Sharing Probability = 4.4 % = > 27 28 29 30 31 EDAP = 4 TSLs at 64 kbps EDAP = 9 TSLs at 64 kbps Nokia Dynamic Abis statistics Dynamic Abis counters per BSC and Dynamic bis pool KPIs on EDAP Availability, Usage of EDAP resources and EDAP request rejections due to capacity All counters are from p_nbsc_dynamic_abis Example printouts of the Nokia Dynamic Abis counter: p_nbsc_dynamic_abis Availability Usage EDAP rejection Key Nokia Dynamic Abis planning principles TRXs (Traffic channels, signalling) and required EDAP within same E1/T1 frame TRXs and EDAPs to be in same physical route Loop protection is OK Splitting of the E1/T1 frame is not recommended EDAP size in the BTS has to be the same as the EDAP size in the BSC Max. EDAP size is 12*64 kbps Timeslot order in the BTS EDAP has to be the same as in the BSC EDAP The pool can be shared by max. 20 transceivers in the same cabinet One PCU can have up to 16 Dynamic Abis pools Easy, fast and remote Nokia Dynamic Abis deployment Nokia tools available for every phase of the service deployment process Planning and Dimensioning Network Doctor Verification of the plan Assessment of required site SW or HW updates Remote and local SW and HW upgrades Installation and activation of the required SW features Verifications and testing of activated units, sites and network Remote configurations (MML in BSC, UltraSite Hub Manager, BTS Manager) Monitoring of the Dynamic Abis performance Development and optimization Traffic manager ITN Node Manager NetAct TRS Planner dimensioning and planning NetAct Traffic Manager node commissioning and configuration NetAct Service Quality Manager quality analysis NetAct Traffica traffic monitoring and troubleshooting NetAct Network Doctor network reporting, optimization and analysis ITN Node manager interfaces and cross-connection definition and control. Dynamic Abis operation when congestion In this case: 4 radio timeslots available in good radio conditions. EDAP pool size is 8 x 16 kbit/s. MS#1 starts FTP download (2 radio tsl, MCS9 => 8 EDAP chs at 16 kbit/s). MS#2 starts FTP download (2 radio tsl, MCS9). Now 4 radio timeslots in use => 2 EDAP chs at 16 Kbps per radio timeslot => speed downgraded and MCS6 used by both the MSs. MS#2 stops FTP download => MS#1 reverts back to MCS9. 13 NOKIA Nokia Dynamic Abis solution.PPT/ 02.12.2004 / HKuosa Company Confidential Key Nokia Dynamic Abis Roadmap Features S11.5 S11.5S12 S12hihiNokia Dynamic Abis solution summary ------Nokia, the pioneer in global EDGE solutions Thank you !