IP Library › Granted Patent US 12,342,228
Granted Patent B2
US 12,342,228 · App. 17/793,059 · Granted Jun 24, 2025

Terminal apparatus, base station apparatus, and method to perform configuration according to radio resource control reconfiguration message

Inventors: Takako Hori (Sakai, JP); Shohei Yamada (Sakai, JP); Hidekazu Tsuboi (Sakai, JP)
Assignee: SHARP KABUSHIKI KAISHA
H04W36/0079H04W76/19H04W76/27
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Quick Facts
Patent No.
US 12,342,228
App. No.
17/793,059
Granted
Jun 24, 2025
Kind
B2
Abstract

A terminal apparatus for communicating with a base station apparatus is provided. The terminal apparatus includes a receiver configured to receive a Radio Resource Control (RRC) reconfiguration message including a parameter related to a first configuration from the base station apparatus, and a processing unit configured to perform configuration in accordance with the RRC reconfiguration message received. In a case that a first timer of an RRC protocol expires, a radio link failure of a source primary cell is not detected, and configuration related to Dual Active Protocol Stack (DAPS) handover is performed for the terminal apparatus, the processing unit reconfigures all of state variables configured for a Radio Link Control (RLC) entity of a Signaling Radio Bearer (SRB) in the source primary cell to respective initial values, resumes the SRB suspended in the source primary cell, and transmits an RRC message for notifying the base station apparatus that the DAPS handover has failed.

Claims (28)

1. A terminal apparatus that communicates with a base station apparatus, the terminal apparatus comprising:

a receiver configured to receive, from the base station apparatus, a Radio Resource Control (RRC) reconfiguration message; and

a processor configured to perform configuration in accordance with the RRC reconfiguration message, wherein

in a case that (i) a first timer of an RRC protocol expires, (ii) a radio link failure in a source primary cell is not detected, (iii) a first configuration is included in the RRC reconfiguration message, and (iv) the first configuration is performed for the terminal apparatus, the processor

reconfigures all state variables configured for a Radio Link Control (RLC) entity of a Signaling Radio Bearer (SRB) in the source primary cell to initial values,

resumes the SRB suspended in the source primary cell, and

transmits an RRC message for notifying the base station apparatus that Dual Active Protocol Stack (DAPS) handover has failed, and

the first configuration is a configuration related to a radio bearer to which the DAPS handover is applied.

2. The terminal apparatus according to claim 1 , wherein

the first timer starts in a case that the terminal apparatus receives, from the base station apparatus, an RRC message including an information element indicating change of a serving cell in an RRC connected state, and stops in a case that a random access to a Special Cell (SpCell) succeeds.

3. A base station apparatus that communicates with a terminal apparatus, the base station apparatus comprising:

a transmitter configured to transmit, to the terminal apparatus, a Radio Resource Control (RRC) reconfiguration message; and

a processor configured to cause the terminal apparatus to perform configuration in accordance with the RRC reconfiguration message, wherein

in a case that (i) a first timer of an RRC protocol expires, (ii) a radio link failure in a source primary cell is not detected, (iii) a first configuration is included in the RRC reconfiguration message, and (iv) the first configuration is performed for the terminal apparatus, the processor causes the terminal apparatus to

reconfigure all state variables configured for a Radio Link Control (RLC) entity of a Signaling Radio Bearer (SRB) in the source primary cell to initial values,

resume the SRB suspended in the source primary cell, and

transmit an RRC message for notifying the base station apparatus that Dual Active Protocol Stack (DAPS) handover has failed, and

the first configuration is a configuration related to a radio bearer to which the DAPS handover is applied.

4. The base station apparatus according to claim 3 , wherein

the first timer starts in a case that the terminal apparatus receives, from the base station apparatus, an RRC message including an information element indicating change of a serving cell in an RRC connected state, and stops in a case that a random access to a Special Cell (SpCell) succeeds.

5. A method for a terminal apparatus that communicates with a base station apparatus, the method comprising:

receiving, from the base station apparatus, a Radio Resource Control (RRC) reconfiguration message;

performing configuration in accordance with the RRC reconfiguration message; and

in a case that (i) a first timer of an RRC protocol expires, (ii) a radio link failure in a source primary cell is not detected, (iii) a first configuration is included in the RRC reconfiguration message, and (iv) the first configuration is performed for the terminal apparatus,

reconfiguring all state variables configured for a Radio Link Control (RLC) entity of a Signaling Radio Bearer (SRB) in the source primary cell to respective initial values,

resuming the SRB suspended in the source primary cell, and

transmitting an RRC message for notifying the base station apparatus that Dual Active Protocol Stack (DAPS) handover has failed, wherein

the first configuration is a configuration related to a radio bearer to which the DAPS handover is applied.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 15, 2022
From: HORI, TAKAKO; YAMADA, SHOHEI; TSUBOI, HIDEKAZU
To: SHARP KABUSHIKI KAISHA
Reel/Frame 060513/0410 →
Priority Claims (1)
JP 2020-007313 · Jan 21, 2020 · national
Continuity (1)
Related Publication 20230037503A1 · Feb 9, 2023
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Cited By (1)
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