# US 2018/0324705 A1 · Dynamic downlink power allocation for supporting higher order modulation

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- Number: US 2018/0324705 A1
- Document ID: US20180324705A1
- Status: Published application
- Kind: A1
- Application number: 15/772,871
- Filed: 2015-11-20
- Published: 2018-11-08
- Earliest claimed: 2015-11-20
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (publ)
- Inventors: Ping YU; Peter HAZY; Tommy IVARSSON; Christien LEBLANC; Hong REN; Eliana YEPEZ
- Web page: https://patentgrep.com/patent/US20180324705A1

## CPC

- H04W 52/143: {Downlink power control}
- H04L 1/0001: {Systems modifying transmission characteristics according to link quality, e.g. power backoff (adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04)}
- H04L 1/0003: {by switching between different modulation schemes}
- H04L 1/0015: {characterised by the adaptation strategy}
- H04L 1/0026: {Transmission of channel quality indication}
- H04L 27/0008: {arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453)}
- H04L 27/3488: {Multiresolution systems}
- H04W 52/24: using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W 52/262: {taking into account adaptive modulation and coding [AMC] scheme}
- H04W 52/365: {Power headroom reporting}
- H04W 72/0473: {the resource being transmission power}
- H04L 5/1453: {of modulation type}
- H04W 52/226: {using past references to control power, e.g. look-up-table}
- 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 network entity for enabling higher order modulation (HOM) mode support for HOM capable wireless devices. The method includes determining a legacy mode power offset value for HOM mode capable wireless devices in legacy modulation mode and calculating a power headroom value for sending downlink data to the HOM mode capable wireless devices. When the power headroom value exceeds a threshold value, the HOM mode support for the HOM mode capable wireless devices is enabled using the identified legacy mode power offset value. When the power headroom value does not exceed the threshold value, and a HOM mode power offset value is available, the HOM mode power offset value being less than the legacy modulation mode power offset value, the HOM mode support for the HOM mode capable wireless devices is enabled using the HOM mode power offset value.

## Claims

### Claim 1

A method for enabling higher order modulation, HOM, mode support for at least one HOM capable wireless device, the method comprising:
determining a legacy mode power offset value for at least one of the at least one HOM mode capable wireless device in legacy modulation mode;
calculating a power headroom value for sending downlink data to the at least one HOM mode capable wireless device;
when the power headroom value exceeds a threshold value:
enabling the HOM mode support for at least one of the at least one HOM mode capable wireless device using the identified legacy mode power offset value;
when the power headroom value does not exceed the threshold value:
determining when a HOM mode power offset value is available, the HOM mode power offset value corresponding to a lower energy per resource element, EPRE, than an EPRE corresponding to the legacy mode power offset value; and
when the HOM mode power offset value is available:
enabling the HOM mode support for at least one of the at least one HOM mode capable wireless device using the HOM mode power offset value.

### Claim 2 (depends on 1)

The method of claim 1, wherein when the HOM mode support is enabled, further comprising receiving a trigger to switch at least one of the at least one HOM capable wireless device from at least one of the legacy modulation mode to the HOM mode and the HOM mode to the legacy modulation mode.

### Claim 3 (depends on 2)

The method of claim 2, wherein the trigger is based on at least a distance between the at least one HOM mode capable wireless device and a network entity.

### Claim 4 (depends on 2)

The method of claim 2, wherein the trigger is based upon at least one of channel quality indicator, CQI, information received from an uplink transmission of the at least one HOM capable wireless device and an outer loop adjustment value for maintaining a target block error rate, BLER.

### Claim 5 (depends on 2)

The method of claim 2, further comprising transmitting, to at least one of the at least one HOM mode capable wireless device, a radio resource control, RRC, reconfiguration message, the RRC reconfiguration message requesting that at least one of the at least one HOM mode capable wireless device is enabled for the HOM mode.

### Claim 6 (depends on 5)

The method of claim 5, wherein the RRC reconfiguration message contains one of the legacy mode power offset value when the at least one HOM mode capable wireless device is configured for legacy modulation mode and the HOM mode power offset value when the at least one HOM mode capable wireless device is configured for HOM mode.

### Claim 7 (depends on 1)

The method of claim 1, further comprising assigning, to at least one of the at least one HOM mode capable wireless device, a power balancing parameter to account for differences between Orthogonal Frequency Division Multiplexing, OFDM, symbols.

### Claim 8 (depends on 1)

The method of claim 1, further comprising:
scheduling at least one of the at least one HOM mode capable wireless device and at least one legacy modulation mode wireless device during a transmission time interval, TTI, when the HOM power offset value is different from the legacy power offset value, the scheduling comprising:
determining a number of unused PRBs based on a number of PRBs allocated to at least one of at least one non-HOM mode capable wireless device and the at least one HOM mode capable wireless device in legacy modulation mode.

### Claim 9 (depends on 1)

The method of claim 1, further comprising scheduling at least one of the at least one HOM mode capable wireless device and no other legacy mode wireless devices during a transmission time interval, TTI, when the HOM mode power offset value is different from the legacy mode power offset value, the scheduling comprising:
assigning, to at least one of the at least one HOM mode capable wireless device, a number of unused PRBs for the TTI based on at least one of a number of PRBs allocated to the at least one HOM mode capable wireless device and the HOM mode power offset value.

### Claim 10 (depends on 2)

The method of claim 2, further comprising:
receiving acknowledgement that the at least one HOM capable wireless device received the downlink data; and
performing link adaptation after the switch of the at least one of the at least one HOM capable wireless device from at least one of the legacy modulation mode to the HOM mode and the HOM mode to the legacy modulation mode, wherein performing the link adaption includes calculating a gain to interference noise ratio, GINR, after the switch of the at least one of the at least one HOM capable wireless device from the legacy modulation mode to the HOM mode, the calculated GINR incorporating a difference between a first power spectrum density, PSD, value measured before the switch and a second PSD value measured after the switch.

### Claim 11

A network entity configured to enable higher order modulation, HOM, mode support for at least one HOM mode capable wireless device, the network entity comprising:
a communication interface configured to receive an uplink communication from the at least one HOM mode capable wireless device; and
processing circuitry including a memory and a processor, the memory in communication with the processor, the memory having instructions that, when executed by the processor, configure the processor to:
determine a legacy mode power offset value for at least one of the at least one HOM mode capable wireless device in a legacy modulation mode;
calculate a power headroom value for sending downlink data to the at least one HOM mode capable wireless device;
when the power headroom value exceeds a threshold value:
enable the HOM mode support for at least one of the at least one HOM mode capable wireless device using the identified legacy mode power offset value;
when the power headroom value does not exceed the threshold value:
determine when a HOM mode power offset value is available, the HOM mode power offset value corresponding to a lower energy per resource element, EPRE, than an EPRE corresponding to the legacy mode power offset value; and
when the HOM mode power offset value is available:
enable the HOM mode support for at least one of the at least one HOM mode capable wireless device using the HOM mode power offset value.

### Claim 12 (depends on 11)

The network entity of claim 11, wherein when the HOM mode support is enabled, the communication interface is further configured to receive a trigger to switch at least one of the at least one HOM mode capable wireless device from at least one of the legacy modulation mode to the HOM mode and the HOM mode to the legacy modulation mode.

### Claim 13 (depends on 12)

The network entity of claim 12, where the trigger is based on at least a distance between the at least one HOM mode capable wireless device and the network entity.

### Claim 14 (depends on 12)

The network entity of claim 12, wherein the trigger is based upon at least one of channel quality indicator, CQI, information received from an uplink transmission of the at least one HOM mode capable wireless device and an outer loop adjustment value for maintaining a target block error rate, BLER.

### Claim 15 (depends on 11)

The network entity of claim 11, wherein the communication interface is configured to transmit, to the at least one HOM mode capable wireless device, a radio resource control, RRC, reconfiguration message, the RRC reconfiguration message requesting that at least one of the at least one HOM mode capable wireless device is enabled for the HOM mode.

### Claim 16 (depends on 15)

The network entity of claim 15, wherein the RRC reconfiguration message contains one of the legacy mode power offset value when the at least one HOM mode capable wireless device is configured for legacy modulation mode and the HOM mode power offset value when the at least one HOM mode capable wireless device is configured for HOM mode.

### Claim 17 (depends on 11)

The network entity of claim 11, wherein the processor is further configured to assign, to at least one of the at least one HOM mode capable wireless device, a power balancing parameter to account for power differences between the Orthogonal Frequency Division Multiplexing, OFDM symbols.

### Claim 18 (depends on 11)

The network entity of claim 11, wherein the processor is further configured to:
schedule at least one of the at least one HOM mode capable wireless device and at least one legacy mode wireless device during a transmission time interval, TTI, when the HOM mode power offset value is different from the legacy mode power offset value, the scheduling comprising:
determining a number of unused PRBs based on a number of PRBs allocated to at least one of at least one non-HOM mode capable wireless device and the at least one HOM mode capable wireless device in legacy modulation mode.

### Claim 19 (depends on 11)

The network entity of claim 11, wherein the processor is further configured to:
schedule at least one of the at least one HOM mode capable wireless device and no other legacy mode wireless devices during a transmission time interval, TTI, when the HOM mode power offset value is different from the legacy power offset value, the scheduling comprising:
assigning, to at least one of the at least one HOM mode capable wireless device, a number of unused PRBs for the TTI based on at least one of a number of PRBs allocated to the at least one HOM mode capable wireless device and the HOM mode power offset value.

### Claim 20 (depends on 11)

The network entity of claim 11, wherein the network entity is a base station.

### Claim 21 (depends on 12)

The network entity of claim 12, wherein the communication interface is configured to receive acknowledgement that the at least one HOM capable wireless device received the downlink data, the processor further configured to:
perform link adaptation after the switch of the at least one of the at least one HOM capable wireless device from at least one of the legacy modulation mode to the HOM mode and the HOM mode to the legacy modulation mode, wherein performing the link adaption includes calculating a gain to interference noise ratio, GINR, after the switch of the at least one of the at least one HOM capable wireless device from the legacy modulation mode to the HOM mode, the calculated GINR incorporating a difference between a first power spectrum density, PSD, value measured before the switch and a second PSD value measured after the switch.

### Claim 22

A network entity configured to enable higher order modulation, HOM, mode support for at least one HOM mode capable wireless device, the network entity comprising:
a communication module configured to receive an uplink communication from the at least one HOM mode capable wireless device;
a power offset value determination module configured to determine a legacy mode power offset value for at least one of the at least one HOM mode capable wireless device in a legacy modulation mode;
a power headroom calculation module configured to calculate a power headroom value for sending downlink data to the at least one HOM mode capable wireless device; and
an HOM mode enablement module configured to:
when the power headroom value exceeds a threshold value:
enable the HOM mode support of at least one of the at least one HOM mode capable wireless device using the identified legacy mode power offset value;
when the power headroom value does not exceed the threshold value:
determine when a HOM mode power offset value is available, the HOM mode power offset value corresponding to a lower energy per resource element, EPRE, than an EPRE corresponding to the legacy mode power offset value; and
when the HOM mode power offset value is available:
enable the HOM mode support for at least one of the at least one HOM mode capable wireless device using the HOM mode power offset value.