Nokia Siemens Networks document on dual band network features
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Dual Band Features
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Nokia Siemens Networks document on dual band network features
- 1. 1 © Nokia Siemens Networks BSSPAR1: Chapter 9 Dual Band Features
- 2. 2 © Nokia Siemens Networks Legal Notice Intellectual Property Rights All copyrights and intellectual property rights for Nokia Siemens Networks training documentation, product documentation and slide presentation material, all of which are forthwith known as Nokia Siemens Networks training material, are the exclusive property of Nokia Siemens Networks . Nokia Siemens Networks owns the rights to copying, modification, translation, adaptation or derivatives including any improvements or developments. Nokia Siemens Networks has the sole right to copy, distribute, amend, modify, develop, license, sublicense, sell, transfer and assign the Nokia Siemens Networks training material. Individuals can use the Nokia Siemens Networks training material for their own personal self-development only, those same individuals cannot subsequently pass on that same Intellectual Property to others without the prior written agreement of Nokia Siemens Networks . The Nokia Siemens Networks training material cannot be used outside of an agreed Nokia Siemens Networks training session for development of groups without the prior written agreement of Nokia Siemens Networks.
- 3. 3 © Nokia Siemens Networks Module Objectives •Explain how additional frequency bands are taken into use in a dual band network •Describe shortly the architecture of a dual band network •Explain in detail the direct access to desired layer / band mechanism (DADL/B)
- 4. 4 © Nokia Siemens Networks 890-915 MHz 935-960 MHz 1710-1785 MHz 1805-1880 MHz BSC Supports: GSM 900/1800 (Europe/ETSI) or GSM 800/1800 or GSM 800/1900 (USA/ANSI) Usually lower signal level for GSM 1800 cell -> MS camps on GSM 900 cell -> must be set less attractive -> or MS must be handed over to GSM 1800 cell BTS equipment Flexi, Ultra, Metro, Talk, Insite Capacity Expansion (Dual Band) Note! RG20 feature Merged P-& E-GSM900
- 5. 5 © Nokia Siemens Networks 890-915 MHz 935-960 MHz Classical GSM 900 (P-GSM) + Extended GSM 900 (E-GSM) PGSM and EGSM band can be configured and used in the same BTS object (requires that Common BCCH option is active) 880- 890 925- 935 E E P P Capacity Expansion (Tri Band)
- 6. 6 © Nokia Siemens Networks Capacity Expansion MS Capability indication • MS indicates its frequency band capabilities and power capabilities in MS Classmark3 information element • Information made available to BSS: • During call setup : Classmark Change message • Inter-BSS handover: Handover Request message from MSC • Intra-BSS handover: BSS maintains the information
- 7. 7 © Nokia Siemens Networks Handover for multi vendor equipment Nokia GSM 900 <-> Nokia GSM 900 Nokia GSM 900 <-> Nokia GSM 1800 Nokia cell <-> other GSM 900 cell (controlled by MSC) 900 1800 Dual band MS 900 NSN BSS MSC other BSS 900 DX 200 CM3 Parameter multiBandCell (DBC) Y/N indicates cell as dual band cell multiCellBandReporting (MBR) 0..3 number of adjacent dual band cells taken into account for measurement report earlySendingIndication (ESI) Y/N enables MS to send classmark 3 message as early as possible Capacity Expansion (Dual Band Network Operation)
- 8. 8 © Nokia Siemens Networks Traffic Management C2 Parameter Direct Access to Desired Layer/Band Umbrella or PBGT handover Adjacent Cell Priorities & Load Factors Advanced Multilayer Handling (AMH) FMMS Detect Idle Mode Call Setup Dedicated mode
- 9. 9 © Nokia Siemens Networks DADL/B Functionality 900 Macro 900 Micro 1800 TCH allocation during call set up (SDCCH handover) Highest Priority 2nd priority 2nd priority 3rd priority MS camped on 900 microcell MS camped on 900 macrocell 900 Micro 1800 Highest Priority • Only Intra-BSC DADL/B handovers possible • Queuing is not allowed for DADL/B handover
- 10. 10 © Nokia Siemens Networks cell load = 100 % Btsloadthreshold < cell load < 100 % Cell load <= btsloadthreshold DR initiated with / without queuing DADL/B initiated TCH allocated from serving cell DADL/B Triggering MO Class Abbreviated Name Range And Step Description Default value BSC - MML Name ADCE dadlbTargetCell Y, N Indicates the cell as a potential target for DADL/B. N DADL BTS btsLoadThreshold 0...100 %, step 1 % Threshold for the BTS to be considered overloaded to trigger a HO from SDCCH to the TCH of other band 70% BLT
- 11. 11 © Nokia Siemens Networks Estimation of RX levels of adjacent DADL/B target cells Ranking of adjacent cells as usual on the basis of hoPriorityLevel, hoLoadFactor, btsLoadThreshold Check of adjacent cells with condition AV_RXLEV_NCELL > hoLevelUmbrella Adjacent DADL/B cell with sufficient RX level Yes No DADL/B handover See next slide Cell load exceeds btsLoadThreshold during call set up but not 100 % DADL/B (Execution)
- 12. 12 © Nokia Siemens Networks Neighbour cell reporting DADL/B triggered MinTimeLimitDR DADL/B handover success DADL/B handover failure DADL/B handover candidate selection fails TCH allocated from DADL/B target cell MaxTimeLimitDR TCH allocation from serving cell Serving cell in real TCH congestion. DR attempt with or without queuing Maximum allowed time for DADL/B handover expires Time TCH allocation from serving cell Serving cell in real TCH congestion. DR attempt with or without queuing DADL/B uses same timers as directed retry DADL/B Timing