US-12628094-B2 - Maximum power reduction based on power headroom

US12628094B2US 12628094 B2US12628094 B2US 12628094B2US-12628094-B2

Abstract

The disclosed technology provides a system and method for allocating resource blocks to a wireless device based on a power headroom of the wireless device as contained in a power headroom report (PHR) from the wireless device. The network allocates wireless devices with the highest power headroom (e.g., power headroom above a certain power threshold) with edge resource blocks, wireless devices with the lowest power headroom (e.g. power headroom below a certain power threshold) with inner resource blocks, and other wireless devices with outer resource blocks.

Inventors

Nishant Patel
Jasinder P. Singh

Assignees

T-MOBILE USA, INC.

Dates

Publication Date: 20260512
Application Date: 20221220

Claims (20)

1 . A computer-readable storage medium, excluding transitory signals and storing instructions, which when executed by a data processor, performs operations, the operations comprising: receiving a report from a wireless device in a wireless communications network, wherein the report indicates a power available to the wireless device for uplink (UL) transmissions; allocating the wireless device with one or more inner resource blocks when the available power is below a first threshold; and, allocating the wireless device with one or more edge resource blocks when the available power is above a second threshold, wherein the first threshold is lower than the second threshold.
2 . The computer-readable storage medium of claim 1 further comprising: receiving an indication of an emergency call originating from or terminating to the wireless device; allocating the wireless device with one or more outer resource blocks or inner resource blocks in response to receiving the indication of the emergency call; and, sending an indication to the wireless device to utilize a Discrete Fourier Transform (DFT)-spread Orthogonal Frequency Division Multiplex (OFDM) (DFT-s-OFDM) waveform for UL transmissions.
3 . The computer-readable storage medium of claim 1 further comprising: determining that a performance of the wireless device is below a pre-determined threshold, wherein the pre-determined threshold is based on at least a radio frequency condition or a network congestion; determining a quality of service (QOS) identifier associated with traffic to or from the wireless device, wherein the QOS identifier comprises at least a 5G QOS identifier (5QI) or a 4G QOS class identifier (QCI), and wherein the QOS identifier comprises at least a first, a second, or a third QOS identifier, wherein the first QOS identifier is associated with a higher priority traffic than the second QOS identifier, and the second QOS identifier is associated with a higher priority traffic than the third QOS identifier; allocate the wireless device with one or more inner resource blocks when the QOS identifier comprises the first QOS identifier; allocate the wireless device with one or more outer resource blocks when the QOS identifier comprises the second QOS identifier; and, allocate the wireless device with one or more edge resource blocks when the QOS identifier comprises the third QOS identifier.
4 . The computer-readable storage medium of claim 1 further comprising: receiving a Single Network Slice Selection Assistance Information (S-NSSAI) from the wireless device; determining a slice service type (SST) associated with the S-NSSAI; allocating the wireless device with one or more inner resource blocks when the SST is a first SST; allocating the wireless device with one or more outer resource blocks when the SST is a second SST; and, allocating the wireless device with one or more edge resource blocks when the SST is a third SST, wherein the first SST is associated with a higher priority traffic than the second SST, and the second SST is associated with a higher priority traffic than the third SST.
5 . The computer-readable storage medium of claim 4 , wherein first SST is associated with a lower latency traffic than traffic associated with the second SST, and the second SST is associated with a lower latency traffic than traffic associated with the third SST.
6 . The computer-readable storage medium of claim 4 , wherein first SST is associated with a higher throughput traffic than traffic associated with the second SST, and the second SST is associated with a higher throughput traffic than traffic associated with the third SST.
7 . The computer-readable storage medium of claim 4 , wherein the first SST is associated with an Ultra-Reliable Low Latency (URLLC) network slice, the second SST is associated with an enhanced Mobile Broad Band (eMBB) network slice, and the third SST is associated with an Internet of Things (IOT) network slice.
8 . A network node apparatus in a wireless communication network, the network node apparatus comprising: at least one hardware processor; and at least one non-transitory memory storing instructions, which, when executed by the at least one hardware processor, cause the wireless communication network to: receive a report from a wireless device communicating with the wireless communications network, wherein the report indicates a power available to the wireless device for uplink (UL) transmissions; allocate the wireless device with one or more inner resource blocks when the available power is below a first threshold; and allocate the wireless device with one or more edge resource blocks when the available power is above a second threshold, wherein the first threshold is lower than the second threshold.
9 . The network node apparatus of claim 8 further caused to: receive an indication of an emergency call originating from or terminating to the wireless device; allocate the wireless device with one or more outer resource blocks or inner resource blocks in response to receiving the indication of the emergency call; and, send an indication to the wireless device to utilize a Discrete Fourier Transform (DFT)-spread Orthogonal Frequency Division Multiplex (OFDM) (DFT-s-OFDM) waveform for UL transmissions.
10 . The network node apparatus of claim 8 further caused to: determine a priority of traffic to or from the wireless device, wherein the priority of traffic is indicated by at least one of a first, or a second traffic priority identifier, and wherein the first traffic priority identifier is associated with a higher priority traffic than the second traffic priority identifier; allocate the wireless device with one or more inner resource blocks when the priority of traffic is indicated by the first traffic priority identifier; allocate the wireless device with one or more edge resource blocks when the priority of traffic is indicated by the second traffic priority identifier; and allocate the wireless device with one or more outer resource blocks when the wireless device is not allocated with the one or more inner resource blocks and the wireless device is not allocated with the one or more edge resource blocks.
11 . The network node apparatus of claim 10 , wherein the priority of traffic to or from the wireless device is indicated by at least one of a 5G quality of service (QOS) identifier (5QI) or a 4G QOS class identifier (QCI).
12 . The network node apparatus of claim 10 , wherein the priority of traffic to or from the wireless device is indicated by at least one of a slice service type (SST) or a slice differentiator (SD).
13 . The network node apparatus of claim 10 , wherein first traffic priority identifier is associated with a lower latency traffic than traffic associated with the second traffic priority identifier.
14 . The network node apparatus of claim 10 , wherein first traffic priority identifier is associated with a higher throughput traffic than traffic associated with the second traffic priority identifier.
15 . The network node apparatus of claim 8 , further comprising allocate the wireless device with one or more outer resource blocks when the available power is between the first threshold and a second threshold.
16 . At least one computer-readable storage medium, excluding transitory signals and carrying instructions, which, when executed by at least one data processor of a system, cause the system to: allocate resource blocks to a wireless device based on an available power of the wireless device as contained in a report received from the wireless device; wherein the allocation is triggered based on a determination that a performance of the wireless device is below a first threshold; wherein the first threshold is based on a radio frequency (RF) condition or based on network congestion; and wherein the allocation to the wireless device provides inner resource blocks when the available power is below the first threshold, and provides edge resource blocks when a power headroom is above the first threshold.
17 . The computer-readable storage medium of claim 16 , wherein the allocation includes providing outer resource blocks when the available power is between the first threshold and a second threshold, wherein the first threshold is lower than the second threshold.
18 . The at least one computer-readable storage medium of claim 16 , wherein the system is further caused to: receive an indication of an emergency call originating from or terminating to the wireless device; allocate the wireless device with one or more outer resource blocks or inner resource blocks in response to receiving the indication of the emergency call; and, send an indication to the wireless device to utilize a Discrete Fourier Transform (DFT)-spread Orthogonal Frequency Division Multiplex (OFDM) (DFT-s-OFDM) waveform for UL transmissions.
19 . The computer-readable storage medium of claim 16 , wherein the system is further caused to: determine a priority of traffic to or from the wireless device, wherein the priority of traffic is indicated by at least a first, or a second traffic priority identifier, and wherein the first traffic priority identifier is associated with a higher priority traffic than the second traffic priority identifier; allocate the wireless device with one or more inner resource blocks when the priority of traffic is indicated by the first traffic priority identifier; allocate the wireless device with one or more edge resource blocks when the priority of traffic is indicated by the second traffic priority identifier; and allocate the wireless device with one or more outer resource blocks when wireless is not allocated with the one or more inner resource blocks and the wireless device is not allocated with the one or more edge resource blocks.
20 . The computer-readable storage medium of claim 19 , wherein the priority of traffic to or from the wireless device is indicated by at least a 5G quality of service (QOS) identifier (5QI) or a 4G QOS class identifier (QCI).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. patent application Ser. No. 17/357,946, filed on Jun. 24, 2021, entitled MAXIMUM POWER REDUCTION BASED ON POWER HEADROOM, which is hereby incorporated by reference in its entirety. BACKGROUND Power back-off, particularly in a power amplifier (PA) of a mobile communication device, e.g., a cellular user equipment (UE), is a power level below the PA's saturation point at which the PA will continue to operate in the linear region even when the input power level swings. Typically, PAs are configured to operate close to saturation as this is the region of maximum efficiency. However, when operating close to saturation, a small increase in input power can push the PA from the linear region to the saturation region thereby leading to non-linear distortion (e.g., intermodulation distortion (IMD)) that can desensitize the receiver. To ensure that the PA operates in the linear region, the PA's power level can be lowered from the point of maximum efficiency to ensure that it always operates in the linear region despite an increase in the input power of the signal to be amplified. The amount by which the power level is lowered is known as the power back-off or power reduction. 5G NR UEs operate with a choice of two waveforms or access schemes in the uplink (UL). Cyclic Prefix (CP) Orthogonal Frequency Division Multiplexing (OFDM) (CP-OFDM) or Discrete Fourier Transform (DFT)-spread OFDM (DFT-s-OFDM). DFT-s-OFDM is also known as Single Carrier-Frequency Division Multiple Access (SC-FDMA). Despite the advantages of CP-OFDM (e.g., better spectral efficiency), CP-OFDM suffers from higher peak-to-average power ratio (PAPR) than DFT-s-OFDM. Because of the PA nonlinearity, 3GPP allows 5G UEs to reduce the UL transmit power for both the CP-OFDM and DFT-s-OFDM waveforms so that the PA, for example, operates in its linear region thereby avoiding or reducing non-linear distortion (e.g., IMD). Maximum power reduction (MPR) defines an allowed reduction of maximum power level for certain combinations of modulation used and number of resource blocks assigned. The MPR allows chipset manufacturers to optimize UEs' modulation performance. 3GPP standards define MPR allowed for UEs with different power classes and for different modulation orders and transmit bandwidth configurations. In general, the higher the modulation order, the higher the power reduction allowed; edge and outer resource block (RB) allocations allow for higher power reduction than inner RB allocations; and, CP-OFDM typically allows for a larger power reduction because of the higher PAPR as described above. See, for example, 3GPP TS 38.101-1 v17.1.0 at Tables 6.2.2-1 and 6.2.2-2 for allowed MPR for different power classes, waveforms, modulation mode, and bandwidth. Although MPR allows UEs to avoid non-linear distortion, higher MPR (higher power back-off) can result in lower UL performance and reduced coverage. BRIEF DESCRIPTION OF THE DRAWINGS Detailed descriptions of implementations of the present invention will be described and explained using the accompanying drawings. FIG. 1 is a block diagram that illustrates a wireless communications system. FIG. 2 is a block diagram that illustrates an example of a computer system in which at least some operations described herein can be implemented. FIG. 3 is flowchart that illustrates allocating resources blocks to a mobile device based on priority of traffic to or from the mobile device. FIG. 4 is a diagram that illustrates allocating resource blocks to a mobile device based on a quality of service (QOS) priority level. FIG. 5 is a diagram that illustrates allocation of resource blocks to a mobile device based on a network slice priority. FIG. 6 is flowchart that illustrates allocating resources blocks and access scheme to a mobile device based on receiving an indication of an emergency call. FIG. 7 is flowchart that illustrates allocating resources blocks to a mobile device based on a power headroom of the mobile device. FIG. 8 is a diagram that illustrates allocating of resource blocks to a mobile device based on a power headroom of the mobile device. The technologies described herein will become more apparent to those skilled in the art from studying the Detailed Description in conjunction with the drawings. Embodiments or implementations describing aspects of the invention are illustrated by way of example, and the same references can indicate similar elements. While the drawings depict various implementations for the purpose of illustration, those skilled in the art will recognize that alternative implementations can be employed without departing from the principles of the present technologies. Accordingly, while specific implementations are shown in the drawings, the technology is amenable to various modifications. DETAILED DESCRIPTION In one aspect of the disclosed technology, a network node (e.g., an eNB or gNB) allocates resource blocks