# US 11,115,847 B2 · Terminal device and method for performing radio link monitoring

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- Number: US 11,115,847 B2
- Document ID: US11115847B2
- Status: Granted
- Kind: B2
- Application number: 15/541,553
- Filed: 2015-12-28
- Published: 2017-12-21
- Granted: 2021-09-07
- Earliest claimed: 2015-01-08
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Hidekazu Tsuboi; Katsunari Uemura; Yasuyuki Kato; Shohei Yamada
- Web page: https://patentgrep.com/patent/US11115847B2

## CPC

- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 43/16: Threshold monitoring
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 72/542: using measured or perceived quality
- H04W 88/02: Terminal devices
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 88/08: Access point devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A terminal device includes a transmission processing part configured to notify the network of a type of the terminal device, and a reception processing part configured to derive the required number of repetitive transmissions and/or repetitive receptions (the first number of repetitions) on the basis of downlink reference signal received power. The terminal device measures the downlink reference signal received power on the basis of the first measurement period longer than 200 ms, upon deriving the first number of repetitions. The type of the terminal device notified to the network is different from a type of a terminal device employing a measurement period of 200 ms.

## Claims

### Claim 1

A terminal device configured to communicate with a base station device, the terminal device comprising:
reception circuitry configured to receive information indicating a number of transmission repetitions for physical downlink control channel, and receive system information other than SystemInformationBlockType1 from the base station device; and
physical layer control circuitry configured to perform radio link monitoring based on a threshold being defined as a level of a downlink radio link, wherein
a value of the threshold corresponds to a specific block error rate of a physical downlink control channel transmission with the number of transmission repetitions,
a period for which first estimation of downlink quality is performed, the first estimation being for the radio link monitoring, is different in length from a period for which second estimation of downlink quality is performed, the second estimation being for radio link monitoring of an another terminal device which uses a parameter included in the SystemInformationBlockType1 received by the another terminal device from the base station device, and
the physical layer control circuitry configured to notify a higher layer of an “out-of-sync” condition when it is estimated that the downlink quality is continuously equal to or less than the value of the threshold for longer than the period for which first estimation of downlink quality is performed.

### Claim 2

A communication method for a terminal device configured to communicate with a base station device, the communication method comprising:
receiving information indicating a number of transmission repetitions for physical downlink control channel, and receive system information other than SystemInformationBlockType1 from the base station device; and
performing radio link monitoring based on a threshold being defined as a level of a downlink radio link, wherein
a value of the threshold corresponds to a specific block error rate of a physical downlink control channel transmission with the number of transmission repetitions,
a period for which first estimation of downlink quality is performed, the first estimation being for the radio link monitoring, is different in length from a period for which second estimation of downlink quality is performed, the second estimation being for radio link monitoring of an another terminal device which uses a parameter included in the SystemInformationBlockType1 received by the another terminal device from the base station device, and
a higher layer of an “out-of-sync” condition is notified when it is estimated that the downlink quality is continuously equal to or less than the value of the threshold for longer than the period for which first estimation of downlink quality is performed.