MCS Offset Determination for UCI on PUSCH with Shortened TTI

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Solution Overview

Problem

Existing high layer signaling indexes cannot support transmitting uplink control information (UCI) on physical uplink shared channel (PUSCH) with shortened transmission time intervals (TTIs), and there is a need to determine UCI modulation and coding scheme (MCS) offset values to control the coding rate and resource allocation for UCI on PUSCH with shortened TTIs.

Innovation Solution

The proposed solution involves determining and signaling beta-offset values, specifically MCS offsets, for UCI transmission on PUSCH with shortened TTIs, using methods that include mapping indices to corresponding beta-values using tables, and configuring these values independently for sTTI transmissions, allowing for flexible coding rate control and resource allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If existing high layer signaling indexes are used for UCI transmission, then the system maintains backward compatibility with normal TTI transmissions, but it cannot support shortened TTI transmissions which require independent MCS offset determination

Engineering Contradiction:

Improvesupport for shortened TTI transmissionsVSAvoidMCS offset determination mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the MCS offset determination by creating separate beta-offset tables specifically for sTTI transmissions, distinct from normal TTI tables. This allows independent configuration and optimization of MCS offsets for shortened TTIs without affecting existing normal TTI operations, thereby supporting sTTI adaptability while maintaining manageable complexity through organized separation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by configuring MCS offset values specifically tailored for sTTI conditions. Instead of using generic MCS offsets for all transmission types, the system determines local beta-offset values that are optimized for the specific characteristics of shortened TTI transmissions, including their unique resource allocation and timing requirements.

Inventive Principle:

Principle #3Local quality

2Productivity

If MCS offset values are determined independently for sTTI transmissions, then coding rate control and resource allocation for UCI on PUSCH with shortened TTIs can be optimized, but the complexity of signaling and configuration increases

Engineering Contradiction:

Improveresource allocation efficiency for UCI on sPUSCHVSAvoidsignaling and configuration overhead

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements universality by designing a unified framework where the same beta-offset determination mechanisms serve both normal TTI and sTTI transmissions. The system uses common signaling structures and configuration procedures that can accommodate both transmission types, reducing the need for entirely separate signaling paths and thereby optimizing resource allocation efficiency while controlling signaling complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent applies preliminary action by pre-configuring beta-offset tables and MCS offset values before sTTI transmissions occur. This allows the system to have optimized resource allocation parameters ready in advance for sTTI conditions, enabling efficient UCI transmission on sPUSCH without requiring complex real-time calculations or extensive signaling during the actual transmission.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If beta-offset values are configured for sTTI transmissions, then UCI transmission reliability and system throughput can be balanced, but the number of parameters to manage increases

Engineering Contradiction:

ImproveUCI transmission reliability on sPUSCHVSAvoidnumber of beta-offset parameters

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting beta-offset values based on sTTI-specific conditions such as transmission timing, resource allocation, and channel characteristics. This allows the system to optimize UCI transmission reliability for shortened TTIs by modifying relevant parameters without requiring a complete set of independent parameters for every possible scenario, thereby managing the number of parameters to be handled.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements equipotentiality by ensuring that the beta-offset configuration mechanism provides equivalent optimization capability for both normal TTI and sTTI transmissions. The system designs the parameter management structure so that similar configuration procedures and parameter sets can serve both transmission types, reducing the overall number of parameters needed while maintaining UCI transmission reliability for sPUSCH.

Inventive Principle:

Principle #12Equipotentiality

Data Source

PatentEP3985897A1Control information MCS offset determination for UCI on pusch with shortened tti

Publication Date: 2022.04.20 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

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AI summary

According to certain embodiments, a method is disclosed for use in a wireless device that is transmitting uplink transmissions using a shortened transmission time interval (sTTI). The method comprises receiving control information from a network node. The control information indicates at least one index, and a beta-offset value is obtained based on the indicated index.