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US 11,457,406 B2Granted
Energy efficient operation of radio network nodes and wireless communication devices in NB-IoT
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsAli Nader, Yi-Pin Eric Wang, Ansuman Adhikary
Life of this patent
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Abstract
A radio network node may operate in a normal or restricted operating state. In the restricted operating state, the radio network node may have just enough activity to enable UEs to detect the cell. The radio access node may transition to the normal operating state in response to messaging from a wireless communication device, such as reception of a random access preamble.
Claims10
A method of operating a wireless communication device, comprising:
- receiving state indicator information broadcast by a radio network node, the state indicator information indicating an operating state of a neighbor cell of the radio network node, wherein the operating state of the neighbor cell comprises a normal operating state in which the neighbor cell transmits synchronization signals according to a first periodicity and a restricted operating state in which the neighbor cell transmits the synchronization signals according to a second periodicity;
- adapting a cell search period based on the state indicator information, and further based on a transmit switch-on period and a transmit switch-off period of the neighbor cell, wherein the transmit switch-on period is a period of time during which a transmitter of the neighbor cell is periodically switched on to transmit the synchronization signals when the neighbor cell is in the restricted operating state, wherein the transmit switch-off period is a period of time during which the transmitter of the neighbor cell is periodically switched off to save power when the neighbor cell is in the restricted operating state;
- and
- receiving the synchronization signals from the neighbor cell during the adapted cell search period.
1 more element
A wireless communication device, comprising:
- at least one processor;
- and
- at least one memory containing instructions that, when executed by the at least one processor, cause the wireless communication device to:
- receive state indicator information broadcast by a radio network node, the state indicator information indicating an operating state of a neighbor cell of the radio network node, wherein the operating state of the neighbor cell comprises a normal operating state in which the neighbor cell transmits synchronization signals according to a first periodicity and a restricted operating state in which the neighbor cell transmits the synchronization signals according to a second periodicity;
- adapt a cell search period based on the state indicator information, and further based on a transmit switch-on period and a transmit switch-off period of the neighbor cell, wherein the transmit switch-on period is a period of time during which a transmitter of the neighbor cell is periodically switched on to transmit the synchronization signals when the neighbor cell is in the restricted operating state, wherein the transmit switch-off period is a period of time during which the transmitter of the neighbor cell is periodically switched off to save power when the neighbor cell is in the restricted operating state;
- and
- receive the synchronization signals from the neighbor cell during the adapted cell search period.
4 more elements
A non-transitory computer-readable media having stored thereon a computer program for operating a wireless communication device in an NB-IoT enabled system, the computer program comprising computer code which, when run on processing circuitry of the wireless communication device causes the wireless communication device to:
- receive state indicator information broadcast by a radio network node, the state indicator information indicating an operating state of a neighbor cell of the radio network node, wherein the operating state of the neighbor cell comprises a normal operating state in which the neighbor cell transmits synchronization signals according to a first periodicity and a restricted operating state in which the neighbor cell transmits the synchronization signals according to a second periodicity;
- adapt a cell search period based on the state indicator information, and further based on a transmit switch-on period and a transmit switch-off period of the neighbor cell, wherein the transmit switch-on period is a period of time during which a transmitter of the neighbor cell is periodically switched on to transmit the synchronization signals when the neighbor cell is in the restricted operating state, wherein the transmit switch-off period is a period of time during which the transmitter of the neighbor cell is periodically switched off to save power when the neighbor cell is in the restricted operating state;
- and
- receive the synchronization signals from the neighbor cell during the adapted cell search period.
1 more element
Dependencies are inferred from the claim text.