# US 10,375,650 B2 · Combined open loop/closed loop method for controlling uplink power of a mobile station

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- Number: US 10,375,650 B2
- Document ID: US10375650B2
- Status: Granted
- Kind: B2
- Application number: 16/142,659
- Filed: 2018-09-26
- Published: 2019-01-17
- Granted: 2019-08-06
- Earliest claimed: 2007-03-07
- Assignees: InterDigital Technology Corporation
- Applicants: InterDigital Technology Corporation
- Inventors: Sung-Hyuk Shin; Zinan Lin; Donald M. Grieco; Robert L. Olesen
- Web page: https://patentgrep.com/patent/US10375650B2

## CPC

- H04W 52/242: {taking into account path loss}
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04W 52/06: TPC algorithms
- H04W 52/08: Closed loop power control
- H04W 52/10: Open loop power control
- H04W 52/146: {Uplink power control}
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- 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 method and apparatus are disclosed comprising a combined open loop/closed loop uplink power control scheme for E-UTRA. The combined open and closed loop method for UL intra-cell PC controls the wireless transmit receive unit (WTRU) transmit power spectral density (PSD), PSDTx, (e.g. power per RB).

## Claims

### Claim 1

A method for controlling transmit power of a wireless transmit receive unit (WTRU) comprising:
receiving signaling indicating an uplink (UL) resource assignment, a power control (PC) correction command and an assigned modulation coding set (MCS);
determining a transmit power based on a combination of a power component corresponding to a bandwidth of the UL resource assignment, an open loop power control (PC) component, a closed loop PC component and a power offset, wherein the open loop PC component comprises a cell specific open loop PC nominal component and a pathloss compensation component based on a filtered pathloss estimate and a pathloss compensation factor, wherein the closed loop PC component comprises a correction factor, wherein the correction factor is based on the PC correction command, and wherein the power offset is related to the assigned MCS; and
applying the transmit power.

### Claim 2 (depends on 1)

The method of claim 1, wherein applying the transmit power comprises:
applying the transmit power in accordance with a timing of a Hybrid Access Repeat Request (HARQ) process.

### Claim 3 (depends on 1)

The method of claim 1, wherein applying the transmit power comprises:
applying the transmit power at a next transmission time of a Hybrid Access Repeat Request (HARQ) process following reception of an UL grant.

### Claim 4 (depends on 1)

The method of claim 1, wherein applying the transmit power comprises applying the transmit power to any of data and control signaling.

### Claim 5 (depends on 1)

The method of claim 1, wherein the open loop PC component comprises a WTRU-specific parameter.

### Claim 6 (depends on 1)

The method of claim 1, wherein the correction factor is zero (0) in an initial uplink transmission.

### Claim 7 (depends on 1)

The method of claim 1, wherein applying the transmit power comprises:
applying a maximum transmit power level instead of the transmit power on condition that the transmit power is greater than or equal to the maximum transmit power level.

### Claim 8 (depends on 7)

The method of claim 7, wherein the maximum power transmit level is based on any of a maximum allowed power and a power class of the WTRU.

### Claim 9 (depends on 7)

The method of claim 7, further comprising receiving signaling indicating a maximum power transmit level.

### Claim 10 (depends on 1)

The method of claim 1, further comprising determining the filtered pathloss estimate as a function of a filter coefficient, an instantaneous pathloss and any of a prior pathloss estimate and a prior filtered pathloss estimate.

### Claim 11

A wireless transmit receive unit (WTRU) comprising circuitry, including a transmitter, a receiver, a processor and memory, configured to:
receive signaling indicating an uplink (UL) resource assignment, a power control (PC) correction command, an assigned modulation coding set (MCS) and a cell-specific pathloss compensation factor;
determine a transmit power based on a combination of a power component corresponding to a bandwidth of the UL resource assignment, an open loop power control (PC) component, a closed loop PC component and a power offset, wherein the open loop PC component comprises a cell specific open loop PC nominal component and a pathloss compensation component based on a filtered pathloss estimate and a pathloss compensation factor, wherein the closed loop PC component comprises a correction factor, wherein the correction factor is based on the PC correction command, and wherein the power offset is related to the assigned MCS; and
apply the transmit power.

### Claim 12 (depends on 11)

The WTRU of claim 11, wherein the circuitry is configured to apply the determined transmit power in accordance with a timing of a Hybrid Automatic Repeat Request (HARQ) process.

### Claim 13 (depends on 11)

The WTRU of claim 11, wherein the circuitry is configured to:
apply the transmit power at a next transmission time of a Hybrid Access Repeat Request (HARQ) process following reception of an UL grant.

### Claim 14 (depends on 11)

The WTRU of claim 11, wherein the circuitry is configured to apply the transmit power to any of data and control signaling.

### Claim 15 (depends on 11)

The WTRU of claim 11, wherein the open loop PC component comprises a WTRU-specific parameter.

### Claim 16 (depends on 11)

The WTRU of claim 11, wherein the correction factor is zero (0) in an initial uplink transmission.

### Claim 17 (depends on 11)

The WTRU claim 11, wherein the circuitry is configured to:
apply a maximum transmit power level instead of the transmit power on condition that the transmit power is greater than or equal to the maximum transmit power level.

### Claim 18 (depends on 17)

The WTRU of claim 17, wherein the maximum power transmit level is based on any of a maximum allowed power and a power class of the WTRU.

### Claim 19 (depends on 17)

The WTRU of claim 17, wherein the circuitry is configured to receive signaling indicating a maximum power transmit level.

### Claim 20 (depends on 11)

The WTRU of claim 11, wherein the circuitry is configured to determine the filtered pathloss estimate as a function of a filter coefficient, an instantaneous pathloss and any of a prior pathloss estimate and a prior filtered pathloss estimate.