Handover method
AssigneeElectronics and Telecommunications Research Institute
InventorHyun Seo Park
Life of this patent
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Abstract
A UE receives a handover command from a source eNB, and transmits a handover indication message to the source eNB while maintaining a connection to the source eNB. After transmitting the handover indication message, the UE disconnects the connection to the source eNB. Further, the UE accesses to a target eNB. A handover command includes information indicating timing advance if a handover without a random access procedure is configured.
Claims22
A handover method performed by a UE, the method comprising:
- receiving, by the UE, a handover command from a source eNB;
- deciding, by the UE, a time point of a handover execution while maintaining a connection to the source eNB;
- and
- executing, by the UE, a handover based on the time point decided by the UE without any handover timing information from the source eNB,
- wherein the executing the handover comprises:
- performing a random access procedure with a target eNB when a handover that does not perform the random access procedure is not configured;
- continuing to receive data from the source eNB after successfully completing the random access procedure;
- transmitting a handover complete to the target eNB;
- and
- stopping receiving data from the source eNB after transmitting the handover complete.
A handover method performed by an eNB, the method comprising:
- transmitting a handover command to a UE;
- deciding a time point of a handover by the UE, the handover being executed based on a time point of a handover execution decided by the UE without any handover timing information from the eNB;
- continuing to transmit data to the UE after the UE successfully completes a random access procedure with a target eNB when a handover that does not perform the random access procedure is not configured;
- stopping transmitting data to the UE after the UE transmits a handover complete to the target eNB;
- disconnecting a connection to the UE after the UE transmits the handover complete to the target eNB;
- and
- forwarding data to the target eNB.
A handover method performed by a UE, the method comprising:
- receiving, by the UE, a SeNB change command from a master eNB;
- deciding, by the UE, a time point of a SeNB change execution while maintaining a connection to a source SeNB;
- and
- executing, by the UE, the SeNB change based on the time point decided by the UE without any SeNB change timing information from the master SeNB.
A handover method performed by a SeNB, the method comprising:
- deciding a time point of a SeNB change by a UE, the SeNB change being executed based on a time point of a SeNB change execution decided by the UE without any SeNB change timing information from the SeNB;
- disconnecting a connection to the UE at the time point of the SeNB change;
- and
- forwarding data to a target SeNB.
Dependencies are inferred from the claim text.