Uplink Power Control in Multi-Subframe Scheduling

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Solution Overview

Problem

The existing LTE system's power controlling method for Uplink (UL) subframes is inadequate in multi-subframe scheduling scenarios, where the corresponding relationship between UL/DL scheduling commands and subframes is disrupted, leading to ineffective power control for PUSCH and PUCCH.

Innovation Solution

A method is introduced to reset the power controlling relationship for PUSCH/PUCCH in multi-subframe scheduling by increasing the number of power controlling bits in scheduling instructions and re-defining their correspondence, allowing for effective power control of UL subframes through first and second power adjustment factors based on previous subframes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing LTE power controlling method is used, then simple power control is maintained, but power control becomes ineffective in multi-subframe scheduling scenarios

Engineering Contradiction:

Improvepower control effectivenessVSAvoidpower controlling relationship complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the power control process by introducing separate first and second power adjustment factors for different UL subframes. The first power adjustment factor is applied to the first UL subframe while the second power adjustment factor is applied to the second UL subframe, allowing independent power control for each subframe in multi-subframe scheduling scenarios.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic power control by allowing the eNB to separately adjust power parameters for different UL subframes through downlink control information. The power adjustment factors can be dynamically changed based on channel conditions, interference levels, and scheduling requirements for each specific subframe.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multi-subframe scheduling is implemented, then scheduling flexibility is improved, but the corresponding relationship between scheduling commands and subframes is disrupted

Engineering Contradiction:

Improvescheduling flexibilityVSAvoidscheduling correspondence information

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent establishes a feedback mechanism where the eNB transmits downlink control information containing power adjustment factors to the UE, and the UE applies these factors to adjust uplink power for specific subframes. This feedback loop maintains the correspondence between scheduling commands and multiple UL subframes even in multi-subframe scheduling scenarios.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent adds a temporal dimension to power control by introducing time-indexed power adjustment factors (first power adjustment factor for first UL subframe, second power adjustment factor for second UL subframe). This dimensional extension allows the system to maintain scheduling correspondence across multiple subframes by associating specific power control parameters with specific time slots.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Measurement precision

If power controlling bits are increased in scheduling instructions, then power control precision is improved, but control signal overhead increases

Engineering Contradiction:

Improvepower control precisionVSAvoidcontrol signal overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent applies local quality by transmitting different power adjustment factors (first and second power adjustment factors) tailored to specific UL subframes. Each subframe receives customized power control parameters based on its specific channel conditions, interference environment, and scheduling requirements, rather than using a uniform power control approach for all subframes.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11570718B2Method for controlling uplink power in multi-subframe scheduling

Publication Date: 2023.01.31 SAMSUNG ELECTRONICS CO LTD

AI summary

Disclosed is a method for transmitting data by a user equipment (UE) in a wireless communication system including receiving scheduling information for scheduling a plurality of uplink (UL) subframes, identifying a UL subframe u among the plurality of UL subframes, determining a first transmit power for a physical uplink shared channel (PUSCH) in the UL subframe u, selecting a transmit power among the first transmit power and a predetermined second transmit power, and transmitting data through the PUSCH in the UL subframe u using the selected transmit power, wherein the first transmit power is determined based on a first power adjustment factor for a UL subframe (u−1), in case that the UL subframe u is different from a first scheduled UL subframe among the plurality of UL subframes, and wherein the first transmit power is determined based on a second power adjustment factor for the UL subframe u, in case that the UL subframe u is the first UL subframe.