# US 2014/0192747 A1 · Method and apparatus of signaling and procedure to support uplink power level determination

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- Number: US 2014/0192747 A1
- Document ID: US20140192747A1
- Status: Published application
- Kind: A1
- Application number: 14/205,623
- Filed: 2014-03-12
- Published: 2014-07-10
- Earliest claimed: 2007-12-07
- Assignees: InterDigital Patent Holdings, Inc.
- Applicants: InterDigital Patent Holdings, Inc.
- Inventors: Jin Wang; Joseph S. Levy; Stephen E. Terry; Ulises Olvera-Hernandez; Shankar Somasundaram
- Web page: https://patentgrep.com/patent/US20140192747A1

## CPC

- H04W 52/242: {taking into account path loss}
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 52/146: {Uplink power control}
- H04W 52/36: with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W 52/50: at the moment of starting communication in a multiple access environment
- H04W 52/245: {taking into account received signal strength}
- H04W 52/246: {where the output power of a terminal is based on a path parameter calculated in said terminal}
- H04W 52/247: {where the output power of a terminal is based on a path parameter sent by another terminal}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Method and apparatus are disclosed for determining a physical uplink power level for transmissions on a physical uplink channel. In one embodiment, a random access channel (RACH) uplink message is transmitted. The RACH uplink message includes a RACH message power level and/or a downlink pathloss figure. A downlink message including a power offset value is received. The physical uplink power level is set for transmissions on the physical uplink channel based on the power offset value. In another embodiment, a RACH uplink message is transmitted and a downlink message including a relative power offset value is received. The physical uplink power level for transmissions on the physical uplink channel is then set based on the relative power off set value.

## Claims

### Claim 1

A method for determining a physical uplink power level for transmissions on a physical uplink channel, the method comprising:
transmitting a random access channel (RACH) uplink message, wherein the RACH uplink message is a RACH preamble or a first scheduled RACH message;
receiving a random access response signal including a relative power offset value; and
setting the physical uplink power level for transmissions on the physical uplink channel based on the relative power offset value, wherein the physical uplink channel is one of a physical uplink control channel or a physical uplink shared channel.

### Claim 2 (depends on 1)

The method of claim 1, wherein the RACH uplink message includes at least one of a RACH message power level or a downlink pathloss figure.

### Claim 3 (depends on 1)

The method of claim 1, wherein the random access response signal has a predetermined transmission power level, wherein a downlink pathloss is calculated based on a received power of the random access response signal and the predetermined transmission power level of the random access response signal, and wherein the first scheduled RACH message includes the calculated downlink pathloss as the downlink pathloss figure.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
receiving a broadcast channel message including an enable/disable indication, the enable/disable indication enabling or disabling transmission of the RACH uplink message.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
receiving a message stopping the physical uplink channel transmission.

### Claim 6

A wireless transmit/receive unit (WTRU) configured to determine a physical uplink power level for transmissions on a physical uplink channel, comprising:
a transmitter configured to transmit a random access channel (RACH) uplink message, wherein the RACH uplink message is a RACH preamble or a first scheduled RACH message;
a receiver configured to receive a random access response signal including a relative power offset value; and
a physical uplink power level processor coupled to the receiver and configured to set the physical uplink power level for transmissions on the physical uplink channel based on the received relative power offset value, wherein the physical uplink channel is one of a physical uplink control channel or a physical uplink shared channel.

### Claim 7 (depends on 6)

The WTRU of claim 6, wherein the RACH uplink message includes at least one of a RACH message power level or a downlink pathloss figure.

### Claim 8 (depends on 6)

The WTRU of claim 6, wherein the random access response signal has a predetermined transmission power level, wherein a downlink pathloss is calculated based on a received power of the random access response signal and the predetermined transmission power level of the random access response signal, and wherein the first scheduled RACH message includes the calculated downlink pathloss as the downlink pathloss figure.

### Claim 9 (depends on 6)

The WTRU of claim 6, further comprising:
the receiver configured to receive a broadcast channel message including an enable/disable indication, the enable/disable indication enabling or disabling transmission of the RACH uplink message.

### Claim 10 (depends on 6)

The WTRU of claim 6, further comprising:
the receiver configured to receive a message stopping the physical uplink channel transmission.