# US 8,570,883 B1 · Selective power mode control of wireless communication devices

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- Number: US 8,570,883 B1
- Document ID: US8570883B1
- Status: Granted
- Kind: B1
- Application number: 12/500,857
- Filed: 2009-07-10
- Granted: 2013-10-29
- Earliest claimed: 2009-07-10
- Assignees: Sprint Communications Company L.P.
- Applicants: Bhagwan Singh Khanka; Jasinder Pal Singh; Sachin R. Vargantwar; Mark Edward Hanna
- Inventors: Bhagwan Singh Khanka; Jasinder Pal Singh; Sachin R. Vargantwar; Mark Edward Hanna
- Web page: https://patentgrep.com/patent/US8570883B1

## CPC

- H04W 52/281: {taking into account user or data type priority}
- H04W 52/327: {Power control of multicast channels}
- H04W 52/58: Format of the TPC bits
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method of operating a wireless communication system includes transmitting a power control code from a wireless access node to each of plurality of wireless communication devices. In each of the plurality of wireless communication devices, the method includes transmitting user communications for receipt by the wireless access node at a first transmit power level as indicated by the power control code. The method also includes transmitting a power mode instruction from the wireless access node to a subset of the plurality of wireless communication devices. In each of the subset of the plurality of wireless communication devices, the method includes transmitting the user communications for receipt by the wireless access node at a second transmit power level as indicated by interpreting the power control code with the power mode instruction.

## Claims

### Claim 1

A method of operating a wireless communication system, the method comprising:
transmitting a power control code comprising a power control bit from a wireless access node to each of plurality of wireless communication devices;
in each of the plurality of wireless communication devices, transmitting user communications for receipt by the wireless access node at a first transmit power level as indicated by the power control code;
transmitting a power mode instruction from the wireless access node to a subset of the plurality of wireless communication devices comprising wireless communication devices operated by an emergency service provider;
in each of the subset of the plurality of wireless communication devices, transmitting the user communications for receipt by the wireless access node at a second transmit power level as indicated by inverting the power control bit responsive to the power mode instruction.

### Claim 2 (depends on 1)

The method of claim 1, wherein the power control bit comprises a reverse activity bit (RAB).

### Claim 3 (depends on 1)

The method of claim 1, wherein the first transmit power level indicates a lower power level than the second transmit power level.

### Claim 4 (depends on 1)

The method of claim 1, wherein the first transmit power level and the second transmit power level are each associated with a different transmit bandwidth of the user communications.

### Claim 5 (depends on 1)

The method of claim 1, wherein the subset of the plurality of wireless communication devices further comprises wireless communication devices that are roaming devices in a wireless coverage area associated with the wireless access node.

### Claim 6 (depends on 1)

The method of claim 1, wherein the subset of the plurality of wireless communication devices further comprises wireless communication devices with a higher quality of service level than the wireless communication devices not of the subset.

### Claim 7 (depends on 1)

The method of claim 1, further comprising:
processing a noise level associated with communications of the plurality of wireless communication devices as received by the wireless access node to determine when to transmit the power mode instruction.

### Claim 8

A method of operating a wireless communication device of an emergency service provider, the method comprising:
receiving a power control code comprising a power control bit from a wireless access node;
determining a first transmit power level as indicated by the power control code;
transmitting user communications at the first transmit power level;
receiving a power mode instruction from the wireless access node;
determining a second transmit power level by inverting the power control bit responsive to the power mode instruction; and
transmitting the user communications at the second transmit power level.

### Claim 9 (depends on 8)

The method of claim 8, wherein the power control bit comprises a reverse activity bit (RAB).

### Claim 10 (depends on 8)

The method of claim 8, wherein the first transmit power level indicates a lower power level than the second transmit power level.

### Claim 11 (depends on 8)

The method of claim 8, wherein the first transmit power level and the second transmit power level are each associated with a different transmit bandwidth of the user communications.

### Claim 12

A wireless communication device of an emergency service provider, comprising:
a transceiver configured to receive a power control code comprising a power control bit from a wireless access node;
a power controller configured to determine a first transmit power level as indicated by the power control code and instruct the transceiver to transmit user communications at the first transmit power level;
the transceiver configured to transmit the user communications at the first transmit power level;
the transceiver configured to receive a power mode instruction from the wireless access node;
the power controller configured to determine a second transmit power level by inverting the power control bit responsive to the power mode instruction and instruct the transceiver to transmit the user communications at a second transmit power level; and
the transceiver configured to transmit the user communications at the second transmit power level.

### Claim 13 (depends on 12)

The wireless communication device of claim 12, wherein the power control bit comprises a reverse activity bit (RAB).

### Claim 14 (depends on 12)

The wireless communication device of claim 12, wherein the first transmit power level indicates a lower power level than the second transmit power level.

### Claim 15 (depends on 12)

The wireless communication device of claim 12, wherein the first transmit power level and the second transmit power level are each associated with a different transmit bandwidth of the user communications.