1 / 14

Inter-RAT Cell Reselection Trial

Inter-RAT Cell Reselection Trial. Objective. To find a good balance between coverage and performance for LTE by adjusting UMTS reselection to LTE. Background Information. Idle mode reselection parameters from LTE to UMTS and vice versa was set to -110 dBm for the market

barrett-sullivan
Télécharger la présentation

Inter-RAT Cell Reselection Trial

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Inter-RAT Cell Reselection Trial

  2. Objective • To find a good balance between coverage and performance for LTE by adjusting UMTS reselection to LTE

  3. Background Information • Idle mode reselection parameters from LTE to UMTS and vice versa was set to -110 dBm for the market • 30% RRC MO-Signaling: UE ping pong from LTE to UMTS with high RRC failures • Reselection from UMTS to LTE was set to AT&T GSV of -104 dBm while LTE to UMTS was retained at -110 dBm • 12% RRC MO-Signaling, reduced RRC failures due to signaling • 20% ERAB attempts lost • 6 dB reselection hysteresis may be too high

  4. Summary of UMTS SIB19 Impact • Negligible impact seen on Accessibility and Retainability • Increased RRC, ERAB and S1 Signaling Attempts • RRC Distribution shows a 6% (abs) increase in RRC MO signaling • Threshhigh at 16 – RRC signaling at 12% • Threshhigh at 14 – RRC signaling at 18% • Traffic increase • Small Increase in IRAT Session Continuity to WCDMA • Throughput is unchanged

  5. Parameterization • UMTS • Threshhigh – 16 (Gold Standard Value, initial value) • Threshhigh – 14 (Current Setting) • LTE (idle mode) • EUtranCellFDD: qRxLevMin: -120 (GSV) • EUtranCellFDD: sNonIntraSearch:10 (GSV) • EUtranCellFDD: threshServingLow:10 (GSV) • LTE (dedicated mode) • ReportConfigEUtraBadCovPrim: a2ThresholdRsrpPrim: -115 (Current Setting) Idle Mode Behaviour UE reselects to UMTS when RSRP falls below -110 dBm and UE reselects to LTE when LTE measured RSRP is -106 dBm Dedicated Mode Behaviour UE will IRAT to UMTS when RSRP is -116 dBm (-115 dBm + 1 dB hysteresis). UE will remain in LTE longer when in dedicated mode.

  6. SiB19 Performance Impact

  7. SiB19 Performance Impact

  8. SiB19 Performance Impact

  9. SiB19 Performance Impact

  10. SiB19 Performance Impact

  11. SiB19 Performance Impact

  12. SiB19 Performance Impact

  13. SiB19 Performance Impact

  14. THANK YOU

More Related