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EP-4742555-A2 - UPLINK POWER CONTROL

EP4742555A2EP 4742555 A2EP4742555 A2EP 4742555A2EP-4742555-A2

Abstract

Techniques for uplink power control (e.g., for New Radio (NR)) are disclosed. A wireless transmit/receive unit (WTRU) may determine that the WTRU is to perform a first and a second transmissions using a first and a second transmission beams. The WTRU may determine an uplink transmission power for one or more of the first or second transmissions. For example, if the angular separation of the first and the second transmission beams is greater than a first separation threshold, the WTRU may determine the uplink transmission power having a first maximum power level parameter and a second maximum power level parameter. If the angular separation of the first and the second transmission beams is less than a second separation threshold, the WTRU determine the uplink transmission power having a shared maximum power level parameter. The WTRU may transmit the first and second transmissions using the first and second transmission beams, respectively.

Inventors

  • COMSA, VIRGIL
  • MARINIER, PAUL
  • TOOHER, J. PATRICK
  • DENG, TAO
  • PELLETIER, GHYSLAIN

Assignees

  • InterDigital Patent Holdings, Inc.

Dates

Publication Date
20260513
Application Date
20170926

Claims (15)

  1. A wireless transmit/receive unit, WTRU, comprising: a processor configured to: determine that a set of physical resource blocks is associated with a first subcarrier spacing; receive information indicating that an uplink transmission is to be performed using at least one physical resource block of the set of physical resource blocks; determine a transmission power for the uplink transmission based on a logarithm of a value, wherein the value is dependent on a ratio between the first subcarrier spacing and a reference subcarrier spacing; and perform the uplink transmission using the determined transmission power.
  2. The WTRU of claim 1, wherein the processor is further configured to: determine a set of power control parameters; and determine the transmission power based on the set of power control parameters.
  3. The WTRU of claim 2, wherein the set of power control parameters comprises a compensation coefficient.
  4. The WTRU of claim 2, wherein one or more of the power control parameters of the set of power control parameters are configured via higher layer signaling.
  5. The WTRU of any of claims 1-4, wherein the reference subcarrier spacing is 15 kHz.
  6. The WTRU of claim 5, wherein the first subcarrier spacing is 30 kHz, and the ratio is two.
  7. The WTRU of claim 5, wherein the first subcarrier spacing is 60 kHz, and the ratio is four.
  8. The WTRU of any of claims 1-7, wherein the uplink transmission corresponds to a physical uplink shared channel, PUSCH, transmission.
  9. The WTRU of any of claims 1-8, wherein the processor configured: determine that a second set of physical resource blocks is associated with a second subcarrier spacing; receive second information indicating that a second uplink transmission is to be performed using at least one physical resource block of the second set of physical resource blocks; determine a second transmission power for the second uplink transmission based on a logarithm of a second value, wherein the second value is dependent on a second ratio between the second subcarrier spacing and the reference subcarrier spacing, the first ratio being different than the second ratio; and perform the second uplink transmission using the second determined transmission power.
  10. The WTRU of any of claims 1-9, wherein the processor is configured to determine the transmission power consistent with the term: 10 log 10 M x , i , c q + 10 log 10 N i , c , where M x,i,c (q) represents a number of resource blocks for a type of transmission, x, in a time interval, q, using a block of resources, i, of a cell, c, and N i,c represents the ratio between the first subcarrier spacing and the reference subcarrier spacing.
  11. The WTRU of any of claims 1-9, wherein the processor is configured to determine the transmission power based at least on the parameters 10log 10 ( M x,i,c ( q )), 10log 10 ( N i,c ), P o_x_ic (q), α i,c ·PL i,c , Δ TF,I,c (q), and f i,c (q), where M x,i,c (q) represents a number of resource blocks for a type of transmission, x, in a time interval, q, using a numerology block, i, of a cell, c, and N i,c represents the ratio between the first subcarrier spacing and the reference subcarrier spacing, each of P o_x_ic (q), α i,c , and Δ TF,I,c (q) are determined based on higher layer configuration information, f i,c (q) represents a transmit power control command, and PL i,c represents a pathloss estimate.
  12. A method performed by a wireless transmit/receive unit, WTRU, the method comprising: determining that a set of physical resource blocks is associated with a first subcarrier spacing; receiving information indicating that an uplink transmission is to be performed using at least one physical resource block of the set of physical resource blocks; determining a transmission power for the uplink transmission based on a logarithm of a value, wherein the value is dependent on a ratio between the first subcarrier spacing and a reference subcarrier spacing; and performing the uplink transmission using the determined transmission power.
  13. The method of claim 12, wherein the method further comprises determining a set of power control parameters, wherein the transmission power is further determined based on the set of power control parameters.
  14. The method of claim 13, wherein the set of power control parameters comprises a compensation coefficient.
  15. The method of claim 13, wherein one or more of the power control parameters of the set of power control parameters are configured via higher layer signaling.

Description

CROSS-REFERENCE TO RELATED APPLICATOINS This application claims the benefit of U.S. Provisional Application Serial No. 62/401,009 filed September 28, 2016, U.S. Provisional Application Serial No. 62/474,955 filed March 22, 2017, and U.S. Provisional Application Serial No. 62/500,809 filed May 3, 2017, the contents of which are incorporated by reference herein. BACKGROUND Mobile communications continue to evolve. A fifth generation may be referred to as 5G, which may implement an advanced wireless communication system called New Radio (NR). SUMMARY Systems, methods, and instrumentalities are disclosed for uplink power control, e.g., for New Radio (NR) by a wireless transmit/receive unit (WTRU). A WTRU may determine that the WTRU is to perform a first transmission using a first transmission beam and a second transmission using a second transmission beam. A WTRU may determine an uplink transmission power for one or more of the first or second transmissions. In examples, a WTRU may determine an angular separation of the first and second transmission beams. For example, a WTRU may determine an angular separation between the first and second transmission beams based on one or more of an angular distance, directional correlation, or spatial separation of the first and second transmission beams. When an angular separation of the first and second transmission beams is greater than a first separation threshold, a WTRU may determine the uplink transmission power based on the first transmission associated with the first transmission beam having a first maximum power level parameter and the second transmission associated with the second transmission beam having a second maximum power level parameter. When an angular separation of the first and second transmission beams is less than a second separation threshold, a WTRU determine the uplink transmission power based on the first transmission associated with the first transmission beam and the second transmission associated with the second transmission beam having a shared maximum power level parameter. The first separation threshold and the second separation threshold may have a same value. One or more of the determined first maximum power level parameter, the second maximum power level parameter, or the shared maximum power level parameter may include a configured maximum transmitted power (PCMAX), wherein the PCMAX may be based on one or more of a maximum gain or a maximum effective isotropic radiated power (EIRP). A WTRU may transmit the first transmission using the first transmission beam and the second transmission using the second transmission beam. When the determined uplink transmission power for one or more of the first or second transmissions exceed a maximum allowed power, a WTRU may perform power scaling of one or more of the first or second transmission beams based on a priority order. The priority order for performing the power scaling of one or more of the first or second transmission beams may be based on one or more of a numerology parameter, or property of the first or second transmission beam that may include one or more of a duration, waveform used, or type of transmission. The determined shared uplink transmission power level parameter may include an EIRP level parameter. A WTRU may determine available power associated with the first transmission beam. When a EIRP threshold value exceeds when the second transmission beam is transmitted with the first transmission beam, a WTRU may perform power allocation on one or more of the first or second transmission beams. When performing the power allocation, a WTRU may, for example, scale one or more of the first or second transmission beams to satisfy the EIRP threshold value associated with the uplink transmission power. Scaling one or more of the first or second transmission beams may be based on one or more of the PCMAX, a total power of on-going transmission of the second transmission, or a guaranteed power of the second transmission. When performing the power allocation, a WTRU may, for example, determine a required transmission power of the first and second transmission beams. A WTRU may calculate a normalized required transmission power associated with the required transmission power of the first and second transmission beams. A WTRU may perform the power allocation of the first and second transmission beams based on the calculated normalized required transmission power. A WTRU may be configured to perform power control for uplink transmissions with multiplexed numerologies, beamforming and related signaling. For example, the WTRU may perform uplink power control based on one or more of the following: power allocation rules, priorities, dependency on numerology, multiplexed numerologies, interference (e.g., victim nodes), beamforming, and/or uplink power control related signaling. Power allocation may be dependent on numerology. Power allocation with multiple numerologies may consider a maximum digital-