# US 2018/0324702 A1 · User device and radio communication method

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- Number: US 2018/0324702 A1
- Document ID: US20180324702A1
- Status: Published application
- Kind: A1
- Application number: 15/773,300
- Filed: 2016-11-02
- Published: 2018-11-08
- Earliest claimed: 2015-11-05
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Hideaki Takahashi; Wuri Andarmawanti Hapsari; Kazuaki Takeda
- Web page: https://patentgrep.com/patent/US20180324702A1

## CPC

- H04W 52/0245: {according to signal strength}
- H04B 17/328: {Reference signal received power [RSRP]; Reference signal received quality [RSRQ]}
- H04B 17/382: for resource allocation, admission control or handover
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 48/16: Discovering, processing access restriction or access information
- H04W 52/0241: {where no transmission is received, e.g. out of range of the transmitter}
- H04W 76/18: Management of setup rejection or failure
- H04W 28/0268: {using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] (negotiating SLA or negotiating QoS H04W28/24)}
- H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00)
- H04W 88/02: Terminal devices
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

An object is to provide a user device and a radio communication method that are capable of appropriately detecting radio link failure (RLF) even when an enhanced coverage mode is in operation. UE (200) includes CE level setting unit (230) that sets, when the UE is set in the enhanced coverage mode, a reception quality threshold (Qin/Qout) of a reference reception power level (RSRP/RSRQ) specified for CE level, and a radio link monitoring unit (240) that executes radio link monitoring based on the set reception quality threshold. The CE level setting unit (230) sets, regardless of whether the UE (200) is set to any CE level or not, a reception quality threshold specified for the maximum CE level.

## Claims

### Claim 1

A user device capable of being set in a first mode that sets a radio link with a radio base station based on a reference reception power level of a radio signal transmitted from the radio base station, and a second mode that sets the radio link based on any one among a plurality of reduced levels having gradually reduced reference reception power levels than the reference reception power level used in the first mode, the user device comprising:
a level setting unit that sets, when the user device is set in the second mode, a reception quality threshold of the reference reception power level specified for the reduced level; and
a radio link monitoring unit that executes monitoring of the radio link based on the reception quality threshold set by the level setting unit, wherein
the level setting unit sets the reception quality threshold specified for the maximum reduced level regardless of whether the user device is set to any of the reduced levels.

### Claim 2

A user device capable of being set in a first mode that sets a radio link with a radio base station based on a reference reception power level of a radio signal transmitted from the radio base station, and a second mode that sets the radio link based on any one among a plurality of reduced levels having gradually reduced reference reception power levels than the reference reception power level used in the first mode, the user device comprising:
a level setting unit that sets, when the user device is set in the second mode, a reception quality threshold of the reference reception power level specified for the reduced level; and
a radio link monitoring unit that measures a reception power level of the radio signal, and executes monitoring of the radio link based on the reception quality threshold set by the level setting unit, wherein
the level setting unit sets the reception quality threshold specified for the reception power level measured by the radio link monitoring unit regardless of whether the user device is set to any of the reduced levels.

### Claim 3

A radio communication method capable of setting a first mode that sets a radio link with a user device based on a reference reception power level of a radio signal received by the user device, and a second mode that sets the radio link based on any one among a plurality of reduced levels having gradually reduced reference reception power levels than the reference reception power level used in the first mode, the radio communication method comprising:
transmitting notification information that notifies the user device of a reception quality threshold of the reference reception power level, wherein
the transmitting includes transmitting to the user device the notification information that includes the reception quality threshold specified for each reduced level.

### Claim 4 (depends on 3)

The radio communication method as claimed in claim 3, wherein the transmitting includes transmitting the notification information that includes a difference between the reception quality threshold specified for each reduced level and a reception quality threshold of the reference reception power level.

### Claim 5

A radio communication method capable of setting a first mode that sets a radio link with a user device based on a reference reception power level of a radio signal received by the user device, and a second mode that sets the radio link based on any one among a plurality of reduced levels having gradually reduced reference reception power levels than the reference reception power level used in the first mode, the radio communication method comprising:
transmitting to the user device individual information dedicated to the user device, wherein
the transmitting includes transmitting to the user device the individual information that includes a reception quality threshold of the reference reception power level, and
the individual information includes the reception quality threshold specified for each reduced level.

### Claim 6 (depends on 5)

The radio communication method as claimed in claim 5, wherein the transmitting includes including a difference between the reception quality threshold specified for each reduced level and a reception quality threshold of the reference reception power level in the individual information.

### Claim 7

A radio communication method capable of setting a first mode that sets a radio link with a user device based on a reference reception power level of a radio signal received by the user device, and a second mode that sets the radio link based on any one among a plurality of reduced levels having gradually reduced reference reception power levels than the reference reception power level used in the first mode, the radio communication method comprising:
transmitting notification information that notifies the user device of timer values to be used for monitoring the radio link in the reduced level, wherein
the transmitting includes transmitting to the user device the timer values specified for each reduced level.

### Claim 8 (depends on 7)

The radio communication method as claimed in claim 7, wherein the transmitting includes, transmitting to the user device a coefficient that can identify a relation between the timer values specified for each reduced level and the timer values specified for the reference reception power level.

### Claim 9

A radio communication method capable of setting a first mode that sets a radio link with a user device based on a reference reception power level of a radio signal received by the user device, and a second mode that sets the radio link based on any one among a plurality of reduced levels having gradually reduced reference reception power levels than the reference reception power level used in the first mode, the radio communication method comprising:
transmitting notification information that notifies the user device of timer values to be used for monitoring the radio link in the reduced level, wherein
the transmitting includes transmitting to the user device the timer values specified for a part of the reduced levels that differ from timer values specified for the reference reception power level.

### Claim 10

A radio communication method capable of setting a first mode that sets a radio link with a user device based on a reference reception power level of a radio signal received by the user device, and a second mode that sets the radio link based on any one among a plurality of reduced levels having gradually reduced reference reception power levels than the reference reception power level used in the first mode, the radio communication method comprising:
transmitting to the user device individual information that is dedicated to the user device, wherein
the transmitting includes transmitting to the user device the individual information that includes timer values to be used for monitoring the radio link in the reduced level, and
the individual information includes the timer values specified for a part of the reduced levels that differ from timer values specified for the reference reception power level.