# US 7,412,254 B2 · Power management and distributed scheduling for uplink transmissions in wireless systems

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- Number: US 7,412,254 B2
- Document ID: US7412254B2
- Status: Granted
- Kind: B2
- Application number: 11/012,898
- Filed: 2004-12-16
- Published: 2006-04-06
- Granted: 2008-08-12
- Earliest claimed: 2004-10-05
- Assignees: Nortel Networks Limited
- Inventors: Nimal Senarath; Kelvin Kar-Kin Au; Shalini Peliyalwar
- Web page: https://patentgrep.com/patent/US7412254B2

## CPC

- H04W 52/146: {Uplink power control}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 52/02: Power saving arrangements
- H04W 52/243: {taking into account interferences}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- Y02D 30/70: in wireless communication networks
- 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

To schedule uplink transmission time slots for a collection of mobile. communication devices, a set of base station target interference patterns is associated with base stations. A time slot target interference pattern is assigned for each time slot and it repeats after several time slots. The time slot target interference pattern in a given time slot specifies the interference allowed by each time slot to a given base station by any single mobile. A priority index may be determined for each time slot for each mobile associated with the particular base station. The priority index may be based, in part, on a determined correlation between the time-slot target interference patterns and a potential interference profile of a mobile to which a time slot is to be allocated. A mobile's throughput requirement, the throughput already received over a specified past duration, the system fairness requirement, as well as the amount of data available for transmission are also used for evaluating the priority index.

## Claims

### Claim 1

At a given base station among a plurality of base stations in a wireless communication system, a method of managing uplink transmission power at a plurality of mobile devices, said method comprising:
selecting a given time slot among a plurality of time slots in a scheduling time frame;
determining an interference metric threshold level for said given base station for said given time slot;
selecting a given mobile station among said plurality of mobile stations;
receiving, from said given mobile station, an indication of a received power level of a pilot signal from said given base station;
determining, from said interference metric threshold level and said indication of said received power level, an interference target threshold for said given mobile station; and
transmitting, to said given mobile station:
permission to transmit an uplink transmission to said given base station in said given time slot; and
an indication of said interference target threshold, whereby a power for said uplink transmission is limited by said interference target threshold.

### Claim 2 (depends on 1)

The method of claim 1 wherein said interference metric threshold level relates to an interference metric and said interference metric is rise over thermal.

### Claim 3 (depends on 1)

The method of claim 1 further comprising:
determining propagation conditions; and
determining said interference metric threshold level based on said propagation conditions.

### Claim 4 (depends on 1)

The method of claim 1 further comprising determining said interference metric threshold level based on a size of a sector served by said given base station.

### Claim 5 (depends on 1)

The method of claim 1 further comprising:
receiving an indication of quality of service requirements for said each mobile station; and
wherein said selecting said given mobile station is further based, in part, on said quality of service requirements.

### Claim 6

A given base station among a plurality of base stations in a wireless communication system including a plurality of mobile wireless communication devices, said given base station comprising:
a scheduler for:
select a given time slot among a plurality of time slots in a scheduling time frame;
determine an interference metric threshold level for said given base station for said given time slot;
select a given mobile station among said plurality of mobile stations;
receive, from said given mobile station, an indication of a received power level of a pilot signal from said given base station; and
determine, from said interference metric threshold level and said indication of said received power level, an interference target threshold for said given mobile station; and
a transmitter for transmitting, to said given mobile station:
permission to transmit an uplink transmission to said given base station in said given time slot; and
an indication of said interference target threshold, whereby a power for said uplink transmission is limited by said interference target threshold.

### Claim 7

A computer readable medium containing computer-executable instructions that, when performed by processor in a scheduler at a given base station among a plurality of base stations in a wireless telecommunications system, cause said processor to:
select a given time slot among a plurality of time slots in a scheduling time frame;
determine an interference metric threshold level for said given base station for said given time slot;
select a given mobile station among said plurality of mobile stations;
receive, from said given mobile station, an indication of a received power level of a pilot signal from said given base station;
determine, from said interference metric threshold level and said indication of said received power level, an interference target threshold for said given mobile station; and
transmit, to said given mobile station:
permission to transmit an uplink transmission to said given base station in said given time slot; and
an indication of said interference target threshold, whereby a power for said uplink transmission is limited by said interference target threshold.