# US 2018/0323885 A1 · Mobile station and reception quality measurement method

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2018/0323885 A1
- Document ID: US20180323885A1
- Status: Published application
- Kind: A1
- Application number: 16/033,123
- Filed: 2018-07-11
- Published: 2018-11-08
- Earliest claimed: 2013-12-25
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Ayako Horiuchi; Masayuki Hoshino; Seigo Nakao
- Web page: https://patentgrep.com/patent/US20180323885A1

## CPC

- H04B 17/328: {Reference signal received power [RSRP]; Reference signal received quality [RSRQ]}
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04W 48/12: using downlink control channel
- Y02D 30/70: in wireless communication networks
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- 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

Received Signal Strength Indicator (RSSI) is measured accurately even in a case where a discovery signal is transmitted. A receiver receives a plurality of subframes, at least one of which includes a discovery signal, and a measurer measures Reference Signal Reception Power (RSRP) using a first resource in which the discovery signal is mapped, measures RSSI using a second resource different from the first resource for which the discovery signal is mapped, and calculates Reference Signal Reception Quality (RSRQ) using RSRP and RSSI.

## Claims

### Claim 1

A communication apparatus comprising:
a receiver which, in operation, receives discovery signal information indicating subframes in which discovery signals are transmitted; and
a measurement circuitry which, in operation, measures Reference Signal Reception Power (RSRP) and Received Signal Strength Indicator (RSSI) using the subframes which are indicated by the discovery signal information.

### Claim 2 (depends on 1)

The communication apparatus according to claim 1, wherein the RSRP is measured based on the discovery signals in the subframes.

### Claim 3 (depends on 1)

The communication apparatus according to claim 1, wherein a number of first resource elements to be used for measuring the RSSI in the subframes is larger than a number of second resource elements to be used for measuring the RSRP in the subframes.

### Claim 4 (depends on 1)

The communication apparatus according to claim 1, wherein a portion of first resource elements to be used for the measurement of the RSSI in the subframes is adjacent along a time axis to second resource elements to be used for the measurement of the RSRP in the subframes.

### Claim 5 (depends on 1)

The communication apparatus according to claim 1, wherein the discovery signal information includes information regarding a transmission repetition period.

### Claim 6 (depends on 2)

The communication apparatus according to claim 2, wherein the discovery signal is one of a Channel State Information (CSI)-RS, a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Cell specific RS (CRS).

### Claim 7 (depends on 1)

The communication apparatus according to claim 1, wherein the discovery signal is a signal transmitted from an OFF-state cell which has no traffic data to be transmitted.

### Claim 8

A reception quality measurement method comprising:
receiving discovery signal information indicating subframes in which discovery signals are transmitted; and
measuring Reference Signal Reception Power (RSRP) and Received Signal Strength Indicator (RSSI) using the subframes which are indicated by the discovery signal information.

### Claim 9 (depends on 8)

The reception quality measurement method according to claim 8, wherein the RSRP is measured based on the discovery signals in the subframes.

### Claim 10 (depends on 8)

The mobile station according to claim 8, wherein a number of first resource elements to be used for measuring the RSSI within the subframes is larger than a number of second resource elements to be used for measuring than the RSRP in the subframes.

### Claim 11 (depends on 8)

The reception quality measurement method according to claim 8, wherein a portion of first resource elements to be used for the measurement of the RSSI in the subframes is adjacent along a time axis to second resource elements to be used for the measurement of the RSRP in the subframes.

### Claim 12 (depends on 8)

The reception quality measurement method according to claim 8, wherein the discovery signal information includes information regarding a transmission repetition period.

### Claim 13 (depends on 9)

The reception quality measurement method according to claim 9, wherein the discovery signal is one of a Channel State Information (CSI)-RS, a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Cell specific RS (CRS).

### Claim 14 (depends on 8)

The reception quality measurement method according to claim 8, wherein the discovery signal is a signal transmitted from an OFF-state cell which has no traffic data to be transmitted.