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3G.ppt
WCDMA networks can be dimensioned to balance coverage, capacity, and quality based on network needs. Co-siting WCDMA and GSM networks allows for shared infrastructure like antennas, power supplies, and transport. The new Ericsson RBS 3206/3106 macro base stations improve capacity and coverage with a single cabinet solution. WCDMA uses code division multiple access which separates users by unique codes, allowing all cells to reuse the same carrier frequency. This improves spectrum efficiency over technologies like TDMA that require frequency planning.
3G.ppt
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- 2. MP MP E T&TU E T&TU M C P A Battery UMTS RBS GSM BTS SharedAntenna Tower Shared Power Supply Rx Rx Tx Rx Rx Tx GSM MS UMTS RNC GSM BSC Shared Transport WCDMA Dual Mode UE Core Network Co-siting in practise Co-working with GSM
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- 5. BBU 9500 • Batteryback up both for +24 V DC or -48 V DC • Available for outdoor RBSs • Two different optional battery types: – 110 Ah or 170 Ah • Cooling and heating in the door • Roxtec cable entries
- 6. Examples of newHW Units FU12 21 Ant A Ant B RX A1 Ctrl TX A RX A2 2100 F O I RX B1 RU21 2120 TX RX B RX A Data FU Ctrl Power F O I All TX 2100 RU22 1940 TX RX B RX A Data A FU Ctrl Power F O I All TX Data B 1900 F O I DC in EC bus ET 1-2 ET 3-4 GPS Test Enet CBU1 CBU - Control Base Unit RU - Radio Unit FU - Filter Unit
- 7. Smart antenna control •Remote Electrical Tilt – RET – Effective network tuning – Powered by FU. – Minimizes interference -> lower noise floor -> increases capacity – Connected to ASC • Antenna System Controller – ASC – Increased up-link performance – Fully integrated into the RBS 3000 – Improves system noise figure – Improves in building coverage – Acts as a TMA
- 8. Capacity and coverage •WCDMA characteristics (soft capacity) gives flexibility between coverage, capacity and quality Lower capacity, increased coverage Higher capacity, less coverage
- 9. The new Macro:RBS3206/3106 • RBS 3206/3106 mainly target high capacity and high coverage applications • The new RBS 3206/3106 has a significantly improved structure as a 1 cabinet solution. RBS 3106/3206 RBS 3101/3202 Indoor solutions Main-Remote RBS 3402 Compact RBS 3203 RBS 3104 Micro RBS 3303 Coverage Capacity
- 10. • Example ofpower levels when different services from different terminals are combined Power levels from UE CA CB CC CD Received power levels at the base station Power is the common shared resource Internet Access Video Multi RAB File down loads Coverage, Capacity & Quality
- 11. One cell frequencyreuse • In CDMA, all cells use the same carrier frequency – Frequency reuse = 1 – No frequency planning! CDMA (reuse = 1) 512 codes *There are available techniques for TDMA to achieve reuse=1 (fractional load planning) Coverage, Capacity & Qualit
- 12. Code planning 512 uniquecodes By having codes from different code groups next to each other,UE current consumption is reduced 64 groups with 8 codes each Planning Issues
- 13. • Users separatedby code • Requires digital transmission • Normally wider bandwidth compare to TDMA • Used for WCDMA and IS- 95 (cdma1x & CDMA2000) • May be combined with FDMA (more than one carrier) 5 MHz (WCDMA) 1.25 MHz (IS-95) time frequency code Introduction CDMA – Code division multiple access