LTE System Overview - additional materials

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Here are some additional materials from LTE System Overview course delivered in October 2012 in Amsterdam, The Netherlands.
If you are interested in attending top in class LTE/LTE-Advanced courses, please have a look http://is-wirelesstraining.com/trainings or contact us directly: sales@is-wireless.com.

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LTE System Overview - additional materials

  1. 1. LTE System Overview Additional Materials
  2. 2. LTE Radio Frames Examples LTE PHY Lab Generations
  3. 3. Downlink Radio Frame 12 SCs Subframe Guardband 4.5 MHz measured BW Guardband 5 MHz channel BWCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  4. 4. Downlink Radio Frame 12 SCs Subframe Guardband 4.5 MHz measured BW Guardband 5 MHz channel BWCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  5. 5. Downlink Radio Frame 12 SCs Subframe P-SS, S-SS RS PBCH PDCCH Guardband 4.5 MHz measured BW Guardband PDSCH 5 MHz channel BWCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  6. 6. Uplink Radio Frame 12SCs Subframe Guardband 4.5 MHz measured BW Guardband 5 MHz channel BWCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  7. 7. Uplink Radio Frame 12 SCs Subframe Guardband 4.5 MHz measured BW Guardband 5 MHz channel BWCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  8. 8. Uplink Radio Frame 12SCs Subframe PUCCH PUSCH SRS Guardband 4.5 MHz measured BW Guardband PRACH 5 MHz channel BWCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  9. 9. LTE SON
  10. 10. E-UTRA Rel. 9 Self Organizing Networks SON SON Objective minimization of manual changes of RAN configuration and optimization SON reduces the need for centralized planning and human intervence Self Configuration Self Optimization Self Healing Optimize powers RF failure Plug in HO params Recovery Network PRACH params actions Alarm restart take eNB over UEs Configuration eNB eNB eNB eNB downloading Self Configuration example features: Self Optimization example features: Self Healing example features: • Plug and play eNB (e.g. HeNB) • Based on UE/eNB measurements: • Automatic detection and locatization • Before eNB switches transmitters (e.g. throughputs, HO failures, etc) of NW failures and faults • Downloading configuration: • Based on NW performance meas. • Performing recovery actions (IP address, Cell IDs, powers, etc) (e.g. RLFs, Drops, etc) (e.g. reconfiguration, restart, reload, • Secure connection establishment • Aim – maximize NW performance load fallback software) and provide cost savings • Optimization of parameters for: HO, RACH, ICIC, TxPower 3GPP approach for SON (3GPP TS 32.500): ”SON algorithms themselves will not be standarized in 3GPP” ”3GPP standarizes measurements, procedures and open interfaces to support SON”Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  11. 11. E-UTRA Rel. 9 SON Architecture Options Centralized SON Distributed SON Hybrid SON SON SON SON SON SON O&M O&M O&M (e.g. alarms, call drops) High level SON policies High level SON policies eNB specific settings eNB specific settings High Level Reports High Level Reports High level network tuning Counters, KPIs Counters, KPIs SON Operation SON SON SON SON SON SON RAN self optimization • • Criteria > 2 cells involved One or two cells involved • Long term statistics • Fast update rate • Both from the other two • Slower update rate • Short term statistics architectures Examples • Auto-configuration with • Automated Neighbor relation dynamic self planning • Handover and ICIC optimization • • Both from the other two • Coverage and capacity Link optimization • RACH optimization architectures optimizationCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  12. 12. E-UTRA Rel. 9 Self Configuration Procedure Example Already deployed eNB New eNB 5. Auto X2 with neighbor setup eNB eNB DHCP 3. Auto software 2. Get the IP address and configuration download eNB Server O&M (e.g. PCIs, neighbors) 1. Auto connect to 6. Configure backhaul the PCIs for cells 7. Set the neighbor Backhaul 4. Autosetup the S1 connection cells (ANR) MMECopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  13. 13. E-UTRA Rel. 9 Self Optimization Algorithm (High Level View) Keep monitoring Monitor input data Analyse input data with optimization algorithms UE measurements UE signalling (e.g. RLF) Cell global counters Yes Meet the targets? No Execute corrective actions Apply optimization algorithm and parameter adaptation System state better after the No Fallback corrective actions execution? mechanism Yes Restore the system to the previous state (before the corrective actions were executed) One time self-optimization procedure endsCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  14. 14. E-UTRA Rel. 9 SON Self Optimization (Mobility Load Balancing) Mobility Load Balancing Procedure example Overloaded eNB X2 eNB1 eNB2 Resource status request Resource status response Load reporting (e.g. # of occupied PRBs) Resource status update SON load balancing Congestion triggered (find eNBs to HO user) Handover procedure (cause: load balancing) Load balancing action Evaluation of HO situation SON load balancing (HO params change required) Mobility change request (cause: load balancing) Mobility change ACK SON HO params change (amending mobility configuration: For the UE not to get back Change of HO Change of HO 2dB range change) to the overloaded cell setting (+2dB) setting (-2dB)Copyright by IS-Wireless. All rights reserved. www.is-wireless.com
  15. 15. E-UTRA Rel. 9 SON Self Optimization Framework in 3GPP Rel. 9/10 SON Functionality Defined by 3GPP SON Feature Load and capacity reporting • Allocated load Load Balancing • Available capacity Mobility configuration negotiations • Information about change of handover trigger on own side • Request to change handover trigger in neighbor cell • Possible rejection of the request RLF and handover reporting • Detection of RLF cause Handover Optimization • Fetching UE measurements and passing to neighbor PRACH information exchange • Fetching UE statistics (e.g. # of RACH attempts before RACH Optimization succesful, contention resolution failure indication) • Exchanging PRACH configuration between eNBs Cell status information Energy Saving • Cell switch on requestCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  16. 16. LTE Voice Solutions CS Fallback and SR-VCC
  17. 17. Voice Solutions Signalling Procedures CS Fallback Procedure – Message Flow MME RNC/ MSC/ eNB BSC VLR Incoming voice call Paging Request (IMSI, TMSI, etc) Paging (STMSI, incl CS indicator) Paging • MME determines S-TMSI related to (STMSI, incl CS indicator) received TMSI RRC connection est • MME pages user in all TAs IDLE-to-connected Service Request (incl CS fallback indicator) • Bearer ctx activation with indication to Service Request perform fallback to 2G/3G (incl CSFB ind.) Initial UE ctx setup (UE capabs, CSFB ind) Handover/eNB assisted cell change/Release with redirect eNB selects suitable cell (e.g. by triggering UE meas of 2G/3G neighbours) Using RRC: Mobility from E-UTRA Command Radio conn est. with target RAN Paging Response Paging Response CS connection establishmentCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  18. 18. Voice Solutions Signalling Procedures SR-VCC – Procedure Overview (Example With PS Data Suspension) SGW/ MSC UTRAN/ IMS eNB MME PGW Serv GERAN PS Voice and PS Data Measurement Reports Voice/nonVoice (GERAN/UTRAN) HO to UTRAN/GERAN Bearer splitting Required (SRVCC ind) Initialization of SRVCC for Voice Bearer PS nonVoice CS HO Preparation If target RAT supports both CS/PS, the PS data bearer bearer suspension will be rerouted via SGSN PS data suspended IMS Service Continuity Procedures CS HO Response (CS resources est.) HO Command (Target cell config.) IMS voice translation Mobility from EUTRA Cmd (Target cell config.) Handover execution CS Voice After CS call is ended UE might perform TAU and get back to LTE to resume PS data bearersCopyright by IS-Wireless. All rights reserved. www.is-wireless.com

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