Huawei F4 1xU9+3xU21 Layering Strategy

1. Huawei F4 1xU9+3xU21 Layering Strategy • Aim: use U21 F1 as access layer, U21 F2/F3 as capacity, and U9 as coverage • (The following settings assume U21 F2/F3 coverage is not continuous) • In idle mode: • UE on U9 F0 can go to U21 F1 and F3, making access to F3 easier; • UE on U21 F1 can go to U9 F0 and U21 F2, making access to F2 easier; • UE on U21 F2/F3 can go to U9 F0 and U21 F1, making access to F1 easier, however no re-selection between F2&F3; • With idle mode re-selection triggered earlier on U9, U9 UE will go to co-located U21 easier. • Load balance in connected mode: • Load will be balanced between U21 F1 and F2, with RAB DRD and inter-frequency LDR. • There will not be load balance between U21 F1 and F3 or F2 and F3. • There will not be load balance between U9 and U21. • Mobility in connected mode (Inter-freq and Inter-RAT): • Due to coverage reason handover, UE should be able to handover from U21 to U9 or GSM, with high priority for inter-frequency handover from U21 F2/F3 to F1. (No need for co-sector handover from F2/F3 to F1?) • There is no need for handover from U9 to co-located U21 due to coverage reason. • There is no need for handover from U21 F1 or F2 to higher layer. • 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.

2. Limitation and Solution • •Limitation from 3GPP: • For idle mode cell re-selection purposes, the UE shall be capable of monitoring: • 32 intra-frequency cells (including serving cell), and • 32 inter-frequency cells, including FDD cells on maximum 2 additional carriers; and • Depending on UE capability, 32 GSM cells distributed on up to 32 GSM carriers. • • In CELL_DCH state, when a single uplink carrier frequency is configured, the UE shall be able to monitor up to: • 32 intra frequency FDD cells (including active set); and • 32 inter frequency cells, including FDD cells distributed on up to 2 additional FDD carriers; and • Depending on UE capability, 32 GSM cells distributed on up to 32 GSM carriers. • Limitation of maximum neighbour number can be configured in a Huawei cell: • The maximum number of intra-frequency neighboring cells is 32, which includes the cell itself. • The maximum number of inter-frequency neighboring cells of single carrier is 32. • The maximum number of inter-frequency neighboring cells of 2 carriers is 64. No more than 2 carriers of inter-frequency cells can be configured. • The maximum number of inter-RAT neighboring cells of multi-carrier is 32. • Neighbour settings *HOPrio=0 for some carriers in order for cell re-selection only.

3. Huawei U9/U21 Neighbor Definition Strategy U21 F3 U21 F2 U21 F2 Inter-freq HO blind handover neighbour for DRD Inter-freq HO U21 F1 Intra-freq HO U21 F1 U21 F1 Intra-freq U9 U9 iRAT HO Inter-system GSM900/1800 IBC/UCell*1 GSM GSM ADCE ADCE Solid line means handover is possible Inter-system neighbours only for cell reselection, no actual handover Inter-freq neighbours only for cell re-selection, no actual handover Inter-freq blind handover neighbours for DRD and LDR