Inter-radio access technology handover
AssigneeGoogle Inc.
InventorChih-Hsiang Wu
Life of this patent
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Abstract
This document describes methods and devices for a handover of a user equipment (110) from a Fifth Generation (5G) New Radio (NR) base station (121) to an Evolved Universal Terrestrial Radio Access (E-UTRA) base station (122). The user equipment (110) may determine to release or keep a Packet Data Convergence Protocol (PDCP) entity (312) depending on the whether the E-UTRA base station (122) is connected to an Evolved Packet Core (160) network or a Fifth Generation Core (150) network. The user equipment (110) may determine to release or keep the PDCP entity (312) depending based on a received NR Radio Resource Control (RRC) message or E-UTRA RRC message.
Claims12
A method of performing a handover from a source base station supporting a first Radio Access Technology (RAT) to a target base station supporting a second RAT, the method comprising a user equipment:
- communicating with the source base station using a Medium Access Control entity, a Radio Link Control entity, a first Packet Data Convergence Protocol entity, and a first Service Data Adaptation Protocol entity;
- receiving a first Radio Resource Control message from the source base station, the first Radio Resource Control message including a second Radio Resource Control message for the handover to the target base station;
- in response to the receiving the first Radio Resource Control message or the second Radio Resource Control message, releasing the Medium Access Control entity and the Radio Link Control entity;
- determining, from the second Radio Resource Control message, that a configuration type is a delta configuration;
- and
- based on the determining that the configuration type is the delta configuration, keeping the first Packet Data Convergence Protocol entity and the first Service Data Adaptation Protocol entity.
A user equipment comprising:
- one or more wireless transceivers;
- a processor;
- and
- a memory comprising instructions for a handover manager executable by the processor to configure the user equipment to:
- communicate with a source base station using a first Radio Access Technology (RAT), a Medium Access Control entity, a Radio Link Control entity, and a first Packet Data Convergence Protocol entity;
- receive a first Radio Resource Control message from the source base station, the first Radio Resource Control message including a second Radio Resource Control message for a handover to a target base station that uses a second RAT;
- in response to the reception of the first Radio Resource Control message or the second Radio Resource Control message, release the Medium Access Control entity and the Radio Link Control entity;
- determine a configuration type from an indication of a configuration type included in the second Radio Resource Control message;
- determine that the configuration type is a delta configuration;
- based on the determining that the configuration type is the delta configuration, keep the first Packet Data Convergence Protocol entity;
- transmit an RRCConnectionConfigurationComplete message;
- and
- communicate with the target base station using the first Packet Data Convergence Protocol entity.
A method of performing a handover from a source base station supporting a first Radio Access Technology (RAT) to a target base station supporting a second RAT, the method comprising a user equipment:
- communicating with a source base station using a Medium Access Control entity, a Radio Link Control entity, and a first Packet Data Convergence Protocol entity;
- receiving a first Radio Resource Control message from the source base station, the first Radio Resource Control message including a second Radio Resource Control message for a handover to a target base station;
- in response to the receiving the first Radio Resource Control message or the second Radio Resource Control message, releasing the Medium Access Control entity and the Radio Link Control entity;
- determining a configuration type from an indication of a configuration type included in the second Radio Resource Control message;
- determining that the configuration type is a delta configuration;
- based on the determining that the configuration type is the delta configuration, keeping the first Packet Data Convergence Protocol entity;
- transmitting an RRCConnectionConfigurationComplete message;
- and
- communicating with the target base station using the first Packet Data Convergence Protocol entity.
Dependencies are inferred from the claim text.