eRAN13.1 LTE Spectrum Coordination Feature Introduction.pptx

eRAN13.1 LTE Spectrum Coordination Feature Introduction

1. eRAN13.1 LTE Spectrum Coordination Feature Introduction

2. Contents Background Feature Overview Impact Analysis Feature Requirements Engineering Guidelines Activation Verification

3. 1. Background LTE high-band networks (such as those on the 2.6 GHz band) have limited uplink coverage, increasing TCP package delay . As a result, downlink user experience is affected. A solution is required . When high band coverage is insufficient in the uplink, shift the PCC of CA UEs to a low band ( such as the 850 MHz band) to provide better uplink coverage, and ensure that downlink services remain on high and low bands. 2.6 GHz/850 MHz 2.6 GHz uplink coverage area 2.6 GHz downlink coverage area [email protected] GHz [email protected] GHz+850 MHz 850 MHz coverage area Point where inter-frequency handovers are triggered based on downlink coverage In this area, the UE is affected by insufficient uplink coverage and has poor service experience. Ideal inter-frequency handover point (Uplink coverage becomes insufficient outwards from this point.) CA UE UL@850 MHz [email protected] GHz+850 MHz

4. 2. Feature Overview Principle A CE UE that camps on a high-band PCell triggers an inter-frequency handover to a low-band cell to perform downlink services. Trigger the handover based on uplink Uu interface quality. Configurable parameters Select a proper SCell as the target PCell . Algorithm internal calculation After the handover, the low-band cell serves as the new PCell , and the original high-band cell serves as an SCell . Uplink coverage is improved after the PCell is shifted to a low band. The CA algorithm is enhanced, increasing SCell usage efficiency. 2.6 GHz/850 MHz [email protected] GHz [email protected] GHz+850 MHz Point where inter-frequency handovers are triggered for the CA UE to perform downlink services UL@850 MHz [email protected] GHz+850 MHz Low-band coverage in the uplink improves user experience. CA UE CA UE 2.6 GHz uplink coverage area 2.6 GHz downlink coverage area 850 MHz coverage area

5. 2. Feature Overview Uplink Uu interface quality threshold: SpectrumCoordSinrThld (new parameter) The eNodeB selects the target PC C as follows: 1. Uses the SINR and load to determine the uplink Uu interface quality. 2. Determines the PCC anchor threshold. 3. If multiple PCells are available, sequences them according to their PCC anchor priorities, cell bandwidths, and Uu interface capabilities. Inter-frequency measurement not required CA UE I nter-frequency handover triggering T arget PC C selection I nter-frequency handover execution Process 1: PCC shift from a high band to a low band

6. 2. Feature Overview Process 2: SCC extension and selection Event A2 offset for an extended SCC: SccA2RsrpThldExtendedOfs (new parameter) Target SCC selection: Based on the Uu interface capability of the cell combination for CA * Smart CA needs to be enabled. For the CA UE after the handover: The PCC operates on a low band. The SC C operates on a high band. LTE spectrum coordination: SCC 850 MHz 2.6 GHz SCC A2 (Extended) SCC A2 After the PCC is shifted to a low band, the high-band SCC is extended and improves user experience. I nter-frequency handover execution completion Extended SCC A2 measurement reported ? SCC deletion SCC A2 measurement reported ? O ptimal SCC selection No Yes Yes

7. 3. Impact Analysis Recommended scenarios High- and low-band CA Remaining power on the high band can be increased. The low band is under planning. The proportion of MCSs 0 to 3 for PUSCHs exceeds 10%. Benefits The proportion of MCSs 0 to 3 for PUSCHs exceeds 10%, and the proportion of CA UEs exceeds 25%. DTs: path loss > 130 dB; 10% to 50% increase in downlink data rates KPIs: 1% to 10% increase in uplink user-perceived rates 1% to 5% increase in downlink user-perceived rates 1% to 20% increase in CA UE rates at cell edges

8. 4. Feature Requirements Software LCOFD-131312 LTE Spectrum Coordination (new in eRAN13.1) LAOFD-001001 LTE-A Introduction Hardware A c ell on the LBBPc board cannot work as the PCell . Others None

9. 5. Engineering Guidelines Scenario: CA has been deployed on high and low bands. Prerequisite: The CaEnhancedPreAllocSwitch and Dl2CCAckResShareSw options are selected, and the HoAdmitSwitch option is deselected. MOD ENODEBALGOSWITCH : CAALGOEXTSWITCH = CaEnhancedPreAllocSwitch -1; MOD CELLALGOSWITCH: LOCALCELLID=0, PucchAlgoSwitch = Dl2CCAckResShareSw-1; MOD ENODEBALGOSWITCH : CAALGOSWITCH=HoWithSccCfgSwitch-1 ; MOD CELLMLBHO: LOCALCELLID=0, MlbMatchOtherFeatureMode = HoAdmitSwitch-0; Activation High-band cell: MOD CAMGTCFG: LOCALCELLID=0, CellCaAlgoSwitch =SpectrumCoordinationSwitch-1; MOD CAMGTCFG: LOCALCELLID=0, SpectrumCoordSinrThld =-2; Low-band cell: MOD CAMGTCFG: LOCALCELLID=0, CellCaAlgoSwitch =SpectrumCoordinationSwitch-1; MOD SCCFREQCFG: PccDlEarfcn =1, SccDlEarfcn =2, SccA2ExtOffset=-10; Deactivation High-band cell: MOD CAMGTCFG: LOCALCELLID=0, CellCaAlgoSwitch =SpectrumCoordinationSwitch-0; Low-band cell: MOD SCCFREQCFG: PccDlEarfcn =1, SccDlEarfcn =2, SccA2ExtOffset=0;

10. 6. Activation Verification Item Description/Formula Expected Result L.HHO.InterFreq.ULquality.PrepAttOut Number of UL-quality-based inter-frequency handover preparation attempts Increased L.HHO.InterFreq.ULquality.ExecAttOut Number of UL-quality-based inter-frequency handover execution attempts Increased L.HHO.InterFreq.ULquality.ExecSuccOut Number of successful UL-quality-based inter-frequency handover executions Increased DL user average throughput ( L.Thrp.bits.DL-L.Thrp.bits.DL.LastTTI )/ L.Thrp.Time.DL.RmvLastTTI Increased UL user average throughput ( L.Thrp.bits.UL-L.Thrp.bits.UL.LastTTI )/ L.Thrp.Time.UL.RmvLastTTI Increased CA edge user average throughput Proportions of L. Thrp. DL. BitRate. Samp. CaUe. Index0 to L. Thrp. DL. BitRate. Samp. CaUe. Index9 Increased CA user average throughput (L.Thrp.bits.DL.CAUser-L.Thrp.bits.DL.LastTTI.CAUser)/L.Thrp.Time.DL.RmvLastTTI.CAUser Increased