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Huawei U9/U21 Layering Strategy. In idle mode: Under normal case, U9 UE goes to U900 while U21 only UE stays on U21; With idle mode re-selection triggered earlier on U9, U9 UE will go to U21 easier. Load balance in connected mode:
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Huawei U9/U21 Layering Strategy • In idle mode: • Under normal case, U9 UE goes to U900 while U21 only UE stays on U21; • With idle mode re-selection triggered earlier on U9, U9 UE will go to U21 easier. • Load balance in connected mode: • In case U21 is overloaded, use load balancing RAB DRD (directed retry) to offload U21, moving U9 UE to U9 layer with RB DRD. • Mobility in connected mode: • UE can handover from U21 to U9 or GSM due to coverage reason, however not the other way; • U9 UE should not handover from U9 cell to GSM unless the two layers having different coverage. • In U9/U21 co-located site, U21 sectors are to be defined as neighbors of U9, however it is only for inter-frequency re-selection, no handover is required from U9 to U21. • In GSM cells, both U9 and U21 sectors are to be defined as neighbors, however they are only for inter-RAT re-selection, no handover is required. CONFIDENTIAL
Huawei U9/U21 Neighbor Definition Strategy U9 Intra-freq U9 Inter-freq HO U21 U21 Intra-freq Inter-RAT Inter-RAT G9 G9 G9 ADCE ADCE Solid line means handover is possible ADJW only for cell reselection, no actual handover Inter-freq neighbours only for cell re-selection, no actual handover CONFIDENTIAL
Huawei U9/U21 Neighbor Definition • The following table summarises how to set neighbours in U9/U21 overlay site. • Negative Qoffset,1 is only required for neighbours from co-located U9 to U21, as in this case U9 RSCP is always stronger than U21. • In case to disable handover from U9 to U21 as well as to GSM, there will be special settings on U9 sector: • Inter-freq and Inter-RAT coexist switch = INTERRAT HANDOVER ONLY • InterFreq and InterRat coexist measure threshold choice = COEXIST_MEAS_THD_CHOICE_INTERRAT • And InterRAT cell specific threshold should be set as extremely low. • It should be applied to not only on co-located U9 site, but also those U9 sectors with both inter-freq and interRat neighbors defined. CONFIDENTIAL
Huawei U21 F2 Layering Strategy • •Function: • Both F1 and F2 has R99 &HSPA activated; • •Traffic is balanced between F1 and F2 by load; • With idle mode re-selection, UE will be able to re-select to U21 F2 in case F1 loaded. • Idle mode: • Both F1 and F2 work as access layer; • UE from other sites will re-select to F1 first, however With idle mode re-selection triggered earlier on F1, UE will be able to re-select to F2; • •In case of UE on F2, it will stay on F2 unless normal cell re-select criteria is triggered. • Load balance: • •With normal RAB DRD, allow traffic overflow between F1 and F2. • Mobility in connected mode: • Voice handover is allowed between 3G cells or from 3G to 2G, PS handover is only allowed between 3G; • UE on F1 won’t be allowed to handover to F2, it can handover to other F1 cells or GSM. CONFIDENTIAL
Huawei U21 F2 Deployment Strategy F2 Inter-freq HO ADJI blind handover neighbor for DRD Intra-freq HO F1 F1 iRAT HO ADJW ADJW iRAT HO iRAT HO GSM GSM900/1800 IBC/UCell*1 GSM ADCE ADCE Solid line means handover is possible ADJW only for cell reselection, no actual handover Inter-freq neighbors, only used for DRD candidate, no handover is required. CONFIDENTIAL
Huawei U21 F1/F2 Neighbor Definition • The following table summarises how to set neighbours in U21 F1/F2 site. • It is pretty similar as NSN F1/F2 setting, and the difference is: • not using negative Qoffset and • Defined blind handover between co-sector F1 and F2. CONFIDENTIAL
