name: SNPL
full_form: Serving and Neighbour cell Pathloss
context: The initial transmission power of the downlink PLCCH is signalled by higher layers. After the initial transmission, the transmission power of PLCCH is under the control of Node-B. The Node-B may optionally adjust the transmission power of PLCCH according to the received TPC commands which are carried by the PLCCH-controlled UL CCTrCH(s). The UE shall generate TPC commands according to a PLCCH quality target set by higher layers. If the PLCCH power should be increased, the TPC command is set to "up", whereas if the power should be reduced the command is set to "down". UTRAN may decide how to adjust the transmit power in response to the received TPC commands. The average power of transmitted PLCCH symbols over one timeslot shall not exceed the limits set by higher layers. The transmission power is defined as the average power over one timeslot of the complex QPSK symbols of a single PLCCH before spreading relative to the power of the P-CCPCH.
description: Serving and Neighbour cell Pathloss (SNPL) is a metric used to calculate the path loss between the serving cell and neighboring cells. It's used in multi-carrier E-DCH transmission where the UE reports SNPL values based on reporting type 1 or type 2. The SNPL value, calculated with reference to one carrier within a carrier group, is shared among all carriers in that group.
explanation: SNPL quantifies the signal strength loss between cells, making it a measurement of signal quality and propagation characteristics.
section_title: 5.11.2	Serving and neighbour cell pathloss metric derivation
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