IP Library › Granted Patent US 10,638,536
Granted Patent B2
US 10,638,536 · App. 16/072,749 · Granted Apr 28, 2020

Terminal apparatus, communication method, and integrated circuit

Inventors: Shoichi Suzuki (Sakai, JP); Tatsushi Aiba (Sakai, JP)
Assignee: SHARP KABUSHIKI KAISHA
H04W76/28H04L1/1812H04W52/0229H04W72/04H04W72/042H04W4/70H04W52/0241Y02D70/20Y02D70/24
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Quick Facts
Patent No.
US 10,638,536
App. No.
16/072,749
Granted
Apr 28, 2020
Kind
B2
Abstract

A terminal apparatus and a base station apparatus are capable of efficiently communicating with each other. A terminal apparatus monitors an NB-PDCCH, performs a DRX functionality that controls monitoring of the NB-PDCCH, starts a downlink HARQ RTT timer, based at least on the NB-PDCCH indicating a downlink transmission, starts an uplink HARQ RTT timer, based at least on the NB-PDCCH indicating an uplink transmission, starts a drx-InactivityTimer, based at least on the downlink HARQ RTT timer expires, starts the drx-InactivityTimer, based at least on the uplink HARQ RTT timer expires, and stops the drx-InactivityTimer, based at least on the NB-PDCCH indicating the downlink transmission or the uplink transmission.

Claims (42)

1. A terminal apparatus comprising:

reception circuitry configured to monitor Narrow Band Physical Downlink Control Channel (NB-PDCCH); and

medium access control layer processing circuitry configured to perform a DRX functionality that controls monitoring of the NB-PDCCH, wherein

the medium access control layer processing circuitry

starts a downlink HARQ RTT timer in a case that the NB-PDCCH indicates a downlink transmission,

starts an uplink HARQ RTT timer in a case that the NB-PDCCH indicates an uplink transmission,

starts a drx-InactivityTimer in a case that the downlink HARQ RTT timer expires,

starts the drx-InactivityTimer in a case that the uplink HARQ RTT timer expires,

stops the drx-InactivityTimer in a case that the NB-PDCCH indicates the downlink transmission, and

stops the drx-InactivityTimer in a case that the NB-PDCCH indicates the uplink transmission.

2. The terminal apparatus according to claim 1 , wherein

the medium access control layer processing circuitry

starts a DL-drx-RetransmissionTimer in a case that the downlink HARQ RTT timer expires,

starts an UL-drx-RetransmissionTimer in a case that the uplink HARQ RTT timer expires,

stops the DL-drx-RetransmissionTimer in a case that the NB-PDCCH indicates the downlink transmission, and

stops the UL-drx-RetransmissionTimer in a case that the NB-PDCCH indicates the uplink transmission.

3. The terminal apparatus according to claim 2 , wherein

the reception circuitry receives first information indicating a value of the drx-InactivityTimer, second information indicating a value of the UL-drx-RetransmissionTimer, and third information indicating a value of the DL-drx-RetransmissionTimer.

4. The terminal apparatus according to claim 1 , wherein

the media access control layer processing circuitry

starts a drx-RetransmissionTimer in a case that the uplink HARQ RTT timer expires,

stops the drx-RetransmissionTimer in a case that the NB-PDCCH indicates the uplink transmission, and

stops the drx-RetransmissionTimer in a case that the NB-PDCCH indicates the downlink transmission.

5. A communication method used by a terminal apparatus, the communication method comprising:

monitoring a Narrow band physical downlink control channel (NB-PDCCH);

performing a DRX functionality that controls monitoring of the NB-PDCCH;

starting a downlink HARQ RTT timer in a case that the NB-PDCCH indicates a downlink transmission;

starting an uplink HARQ RTT timer in a case that the NB-PDCCH indicates an uplink transmission;

starting a drx-InactivityTimer in a case that the downlink HARQ RTT timer expires;

starting the drx-InactivityTimer in a case that the uplink HARQ RTT timer expires; and

stopping the drx-InactivityTimer in a case that the NB-PDCCH indicates the downlink transmission, and

stopping the drx-InactivityTimer in a case that the NB-PDCCH indicates the uplink transmission.

6. An integrated circuit that is built into a terminal apparatus, the integrated circuit comprising:

reception circuitry configured to monitor a Narrow band physical downlink control channel (NB-PDCCH); and

medium access control layer processing circuitry configured to perform a DRX functionality that controls monitoring of the NB-PDCCH, wherein

the medium access control layer processing circuitry

starts a downlink HARQ RTT timer in a case that the NB-PDCCH indicates a downlink transmission,

starts an uplink HARQ RTT timer in a case that the NB-PDCCH indicates an uplink transmission,

starts a drx-InactivityTimer in a case that the downlink HARQ RTT timer expires,

starts the drx-InactivityTimer in a case that the uplink HARQ RTT timer expires,

stops the drx-InactivityTimer in a case that the NB-PDCCH indicates the downlink transmission, and

stops the drx-InactivityTimer in a case that the NB-PDCCH indicates the uplink transmission.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 24, 2018
From: SUZUKI, SHOICHI; AIBA, TATSUSHI
To: SHARP KABUSHIKI KAISHA
Reel/Frame 046691/0754 →
Priority Claims (1)
JP 2016-015282 · Jan 29, 2016 · national
Continuity (1)
Related Publication 20190037637A1 · Jan 31, 2019