# US 2021/0345355 A1 · Device-to-device (d2d) channel management with network-assisted reference signal transmission

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- Number: US 2021/0345355 A1
- Document ID: US20210345355A1
- Status: Published application
- Kind: A1
- Application number: 17/374,678
- Filed: 2021-07-13
- Published: 2021-11-04
- Earliest claimed: 2014-08-08
- Assignees: KYOCERA Corporation
- Applicants: Kyocera Corporation
- Inventors: Amit KALHAN; Henry CHANG
- Web page: https://patentgrep.com/patent/US20210345355A1

## CPC

- H04W 72/543: based on requested quality, e.g. QoS
- 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)}
- H04W 72/54: based on quality criteria
- H04W 76/14: Direct-mode setup
- 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 base station (eNB) determines device-to-device (D2D) transmission parameters for signal transmission over a D2D communication link between a first user equipment (UE) device and a second UE device. The eNB instructs the first UE device to transmit a reference signal that is received by the second UE device. The second UE device reports D2D channel characteristic information indicative of the received reference signal. Based on the D2D channel characteristic information, the base station determines the D2D transmission parameters and provides the parameters to the first UE device.

## Claims

### Claim 1

A method comprising:
receiving, at a first user equipment (UE) device, a reference signal from a second UE device;
receiving first information, at the first UE device, the first information identifying a first configuration for receiving the reference signal from the second UE device;
determining, at the first UE device, device-to-device (D2D) measurement results by measuring at least one signal parameter of a UE device received reference signal that is the reference signal from the second UE device as received at the first UE device, wherein the D2D measurement results are based on a plurality of UE device received reference signals received at the first UE device at different times; and
transmitting, from the first UE device, the D2D measurement results after receiving the first information and determining the D2D measurement results.

### Claim 2 (depends on 1)

The method of claim 1, wherein the determining comprises filtering the plurality of UE device received reference signals received at the first UE device at different times.

### Claim 3 (depends on 1)

The method of claim 1, wherein the second UE device transmits the reference signal in response to receiving second information from a base station, the second information identifying a second configuration for transmitting the reference signal to the first UE device.

### Claim 4

A first user equipment (UE) device comprising:
a receiver configured to:
receive, from a second UE device, a reference signal; and
receive first information, the first information identifying a first configuration for receiving the reference signal from the second UE device;
a controller configured to determine device-to-device (D2D) measurement results by measuring at least one signal parameter of a UE device received reference signal that is the reference signal from the second UE device as received at the first UE device; and
a transmitter configured to transmit the D2D measurement results after receiving the first information and determining the D2D measurement results,
wherein the controller is configured to determine the D2D measurement results based on a plurality of UE device received reference signals received at the first UE device at different times.

### Claim 5 (depends on 4)

The first UE device of claim 4, wherein the controller is further configured to filter the plurality of UE device received reference signals received at the first UE device at different times.

### Claim 6 (depends on 4)

The first UE device of claim 4, wherein the second UE device transmits the reference signal in response to receiving second information from a base station, the second information identifying a second configuration for transmitting the reference signal to the first UE device.