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US 12,593,292 B2Granted
User equipment synchronization during handover
AssigneeNokia Technologies Oy
InventorsThomas Haaning Jacobsen, Troels Emil Kolding, Pilar Andrés Maldonado, Renato Barbosa Abreu, Rakash Sivasiva Ganesan, Sean Kelley
Life of this patent
Estimating the term…
Abstract
Improved techniques of handover include the source gNB estimating the accuracy of the timing information that the UE may derive from its local clock during and shortly after the HO procedure and exchange this with the target gNB. Based on this estimate, the target gNB can determine when a timing information update is needed at the UE.
Claims19
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 cause the apparatus at least to:
- receive, from a source network node in a network during a handover operation,
- time synchronization data representing a time synchronization accuracy of a user equipment in the network;
- receive, from the network,
- time synchronization accuracy budget data representing a time synchronization accuracy budget;
- and
- generate a time synchronization headroom based on the time synchronization accuracy of the user equipment and the time synchronization accuracy budget,
- the time synchronization headroom indicating a periodicity of a time update transmission to the user equipment;
- determine an instant of time at which a timing update is to be transmitted to the user equipment,
- the instant of time being based on the time synchronization data received from the source network node and
- a time and frequency stability of the user equipment.
11 more elements
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 cause the apparatus at least to:
- generate time synchronization data representing an estimate of an accuracy of timing information at a user equipment;
- receive an indication of a handover to a target network node of a user equipment having a radio resource connection to the apparatus;
- and
- transmit the time synchronization data to the target network node;
- receive accuracy feedback from the target network node,
- wherein the accuracy feedback dependent at least in part on an instant of time at which a timing update is to be transmitted by the target network node to the user equipment,
- the instant of time being based on the time synchronization data and a time and frequency stability of the user equipment.
8 more elements
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 cause the apparatus at least to:
- receive, from a source network node,
- a handover command indicating to the apparatus to switch a source of time synchronization from the source network node to a target network node,
- the handover command including time synchronization accuracy feedback data representing a time synchronization accuracy feedback generated by the target network node;
- wherein the time synchronization accuracy feedback dependent at least in part on an instant of time at which a timing update is to be transmitted by the target network node to the apparatus,
- the instant of time being based on time synchronization data received by the target network node and a time and frequency stability of the apparatus.
6 more elements
Dependencies are inferred from the claim text.