Energy saving for periodic transmissions
Various techniques are provided for determining, by a network device, a number indicating a quantity of user equipment (UE) that are in an idle state, determining, by the network device, whether the network device can operate in an energy-saving transmission mode based on the number indicating a quantity of UE that are in an idle state, in response to determining the network device can operate in the energy-saving transmission mode using, by the network device, energy-saving transmissions, and notifying, by the network device, at least one UE being served by the network device of the energy-saving transmissions.
1 . An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to:
determine a number indicating a quantity of user equipment (UE) that are in an idle state;
determine whether the apparatus can operate in an energy-saving transmission mode based on the number indicating a quantity of UE that are in an idle state; and
in response to determining the apparatus can operate in the energy-saving transmission mode,
use energy-saving transmissions, and
notify at least one UE being served by the apparatus of the energy-saving transmissions,
wherein the determining of whether the apparatus can operate in the energy-saving transmission mode includes determining whether the number of UE that are in an idle state is less than a threshold number;
wherein the threshold number is based on a number of UEs in an active state that are being served by the apparatus;
wherein the energy-saving transmissions includes reducing a peak-to-average-power ratio (PAPR) of an SSB signal when physical broadcast channel is transmitted; and
wherein the energy-saving transmissions includes reducing the PAPR of the SSB signal based on a tone cancellation technique or a peak cancellation signal.
2 . The apparatus of claim 1 , wherein the energy-saving transmissions are energy-saving synchronization signal block (SSB) transmissions.
3 . The apparatus of claim 1 , the at least one memory and the computer program code further configured to cause the apparatus to:
trigger contention based (CB) physical random access channel (PRACH) transmissions; and
receive CB PRACH transmissions from a plurality of UEs each in an idle state, wherein the determining of the number indicating a quantity of UE that are in an idle state is based on a quantity of the plurality of UEs.
4 . The apparatus of claim 1 , wherein the notifying of UEs being served by the apparatus of the energy-saving transmissions one of:
uses a spare bit of a master information block, or
uses a system information block.
5 . The apparatus of claim 1 , wherein the energy-saving transmissions includes using no frequency domain multiplexing between SSB and other signals transmitted from the apparatus.
6 . The apparatus of claim 1 , wherein the energy-saving transmissions includes using a long periodicity between legacy SSB transmissions and a smaller periodicity for SSB transmissions without physical broadcast channel.