Invention Grant
- Patent Title: Handover management in communication systems using unlicensed frequency bands
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Application No.: US18211091Application Date: 2023-06-16
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Publication No.: US11979784B2Publication Date: 2024-05-07
- Inventor: Henry Chang , Masato Fujishiro
- Applicant: Kyocera Corporation
- Applicant Address: JP Kyoto
- Assignee: Kyocera Corporation
- Current Assignee: Kyocera Corporation
- Current Assignee Address: JP Kyoto
- Main IPC: H04W36/00
- IPC: H04W36/00 ; H04W36/08 ; H04W36/30 ; H04W76/27

Abstract:
Handovers in a New Radio-Unlicensed Standalone (NR-U SA) communication system are managed by invoking one of a plurality of handover procedures based on conditions related to the communication device and channel status. One example of one of the plurality of handover procedures includes sending a handover command with an inactivity indicator to the UE device where the UE device transitions to an Inactive State (such as RRC_INACTIVE) in response to a handover failure (HOF) resulting from an occupied unlicensed channel. The UE device provides the I-RNTI allocated by the last serving gNB when resuming from the RRC_INACTIVE to the active state; thereby reducing the latency associated with a new connection from the idle mode. The target gNB uses the I-RNTI to retrieve the UE context from the last serving gNB.
Public/Granted literature
- US20230337080A1 HANDOVER MANAGEMENT IN COMMUNICATION SYSTEMS USING UNLICENSED FREQUENCY BANDS Public/Granted day:2023-10-19
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