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Security level: Open HUAWEI TECHNOLOGIES Co., Ltd. Page 2 Energy Saving Enhancement Scenarios Scenarios 1: A macro cell provides coverage in a certain area A cells traffic volume is very low, this cell will be shut off to save energy This cell coverage area is covered by a neighbor cell C1 C3C2 Before ES C4 C1 C3 C2 C4 After ES coverage compensation (c2 is off, c3 extents coverage to C2 area) Neighbour cells: C2 Neighbour cells: C1,C3,C4 Neighbour cells: C4 Neighbour cells: C3

Security level: Open HUAWEI TECHNOLOGIES Co., Ltd. Procedures Before ES C2 has low traffic volume and is to be turned off. C2 notifies the neighbor cells (C1,C3,C4) that C2 is off. Neighbor cells (C1,C3,C4) acknowledges the off notification of C1 and removes C2 from neighbor cell’s list. ES compensation procedure Option 1: C2 requests C3 to perform coverage compensation, the request includes C2’s neighbor cells info(C1,C3,C4). Determination method is implementation specific. C3 confirms to perform coverage expansion for C2 coverage area. Option 2: OM/BSC requests C3 to perform coverage compensation. C3 enlarges the coverage area to cover the area of C2. C3 notifies the neighbor cells (C1,C4) to update neighbor cell’s list, e.g. to add C3 to C1/C4’s neighbor cell’s list. 3 Page 3

Security level: Open HUAWEI TECHNOLOGIES Co., Ltd. Procedures-cont Powered off cell is back to normal C2 requests power on and sends the request including event time to C3 C3 confirms the power on request of C2, and shrink its coverage at the indicated event time. C3 notifies C1 and C4 that the C3 coverage is back t o normal. C1 and C4 removes C3 from neighbor cell list. C2 is power on, and notifies the neighbor C1/C3/C4. 4 Page 4

Security level: Open HUAWEI TECHNOLOGIES Co., Ltd. Page 5 Energy Saving Enhancement Scenarios Scenarios 2: Multiple macro cells provide coverage in a certain area A cell traffic volume is very low, this cell will be shut off to save energy This cell coverage area is covered by neighbor cells C1 C3C2 Before ES C4 C1C3 C2 C4 After ES coverage compensation (c2 is off, c1 and c3 extents coverage to C2 area) Neighbour cells: C2 Neighbour cells: C1,C3,C4 Neighbour cells: C4,C1 Neighbour cells: C3,C1 Neighbour cells: C4,C3

Security level: Open HUAWEI TECHNOLOGIES Co., Ltd. Procedures Before ES C2 has low traffic volume and is to be turned off. C2 notifies the neighbor cells (C1,C3,C4) that C2 is off. Neighbor cells (C1,C3,C4) acknowledges the off notification of C1 and removes C2 from neighbor cell’s list. ES compensation procedure Option 1: C2 requests C1 and C3 to perform coverage compensation, the request includes C2’s neighbor cells info(C1,C3,C4). Determination method is implementation specific. C1 and C3 confirm to perform coverage expansion for C2 coverage area. Option 2: OM/BSC requests C1/C3 to perform coverage compensation. C1 and C3 enlarge the coverage area to cover the area of C2. C3 notifies the neighbor cells (C1, C4) to update neighbor cell’s list, e.g. to add C3 to C1/C4’s neighbor cell’s list. C1 notifies the neighbor cells (C3, C4) to update neighbor cell’s list, e.g. to add C1 to C3/C4’s neighbor cell’s list. 6 Page 6

Security level: Open HUAWEI TECHNOLOGIES Co., Ltd. Procedures-cont Powered off cell is back to normal C2 requests power on and sends the request including event time to C1 and C3. C1 and C3 confirm the power on request of C2, and shrink C1/C3 coverage at the indicated event time. C1 notifies C3 and C4 that the C1 coverage is back t o normal. C3 and C4 removes C1 from neighbor cell list. C3 notifies C1 and C4 that the C3 coverage is back t o normal. C1 and C4 removes C3 from neighbor cell list. C2 is power on, and notifies the neighbor C1/C3/C4. 7 Page 7

Security level: Open HUAWEI TECHNOLOGIES Co., Ltd. Coverage compensation parameters Geographic info  the power off/on cell’s coverage info. Cell’s info  The power off/on cell’s Frequency and PN info Power on/off cell’s Neighbor cell info  Frequency and PN info 8 Page 8

Security level: Open HUAWEI TECHNOLOGIES Co., Ltd. 9 Page 9 Thanks