Uplink Resource Allocation for Shortened Transmission Time Intervals

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently allocating resources for data and reference signal transmissions in shortened transmission time intervals (sTTIs), which are crucial for low latency and high reliability communications, especially in next-generation networks like 5G.

Innovation Solution

The described techniques involve identifying and allocating uplink resources for sTTIs, configuring reference signal (RS) configurations, including the locations of RS and data symbols within these intervals, and dynamically signaling these configurations to user equipment (UEs) to optimize data and reference signal transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If shortened transmission time intervals (sTTIs) are used to reduce latency, then transmission speed is improved, but resource allocation complexity increases

Engineering Contradiction:

Improvetransmission speedVSAvoidresource allocation complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The sTTI structure is segmented into distinct regions: a control region containing one or more reference signal symbols for channel estimation and demodulation, and a data region containing payload symbols. This segmentation allows independent optimization of control and data portions, simplifying resource allocation while maintaining low latency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Reference signal symbols are positioned at predetermined locations within the sTTI structure, establishing channel estimates before data transmission begins. This preliminary action enables efficient demodulation of subsequent data symbols without requiring additional processing time, thus reducing overall latency while simplifying receiver operations.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If reference signal density is increased to improve demodulation accuracy, then measurement precision is improved, but resource overhead increases

Engineering Contradiction:

Improvedemodulation accuracyVSAvoidresource overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

Reference signal symbols are concentrated in specific local regions at the beginning of the sTTI where they are most needed for initial channel estimation and demodulation. This local quality approach provides high measurement precision where critical while minimizing reference signal overhead in data regions, optimizing the balance between accuracy and resource efficiency.

Inventive Principle:

Principle #3Local quality

3Duration of action of moving object

If sTTI length is reduced to achieve low latency, then duration of action is improved, but data capacity decreases

Engineering Contradiction:

Improvetransmission durationVSAvoiddata capacity

Core Design Contradiction:

Duration of action of moving objectVSQuantity of substance

Solution Approach 1:

The sTTI structure maintains continuous useful action by immediately following reference signal symbols with data payload symbols within the same shortened interval. This continuity ensures that the reduced transmission duration is fully utilized for productive data transmission, maximizing data capacity within the constrained sTTI timeframe without wasted resources.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS11381435B2Configuration for data and reference signal transmissions with shortened transmission time intervals

Publication Date: 2022.07.05 QUALCOMM INC

AI summary

Techniques provide for identifying uplink resources that are to be used for uplink transmissions using shortened transmission time intervals (sTTIs), such as low latency or high reliability transmissions. A reference signal (RS) configuration for a three-symbol sTTI, including locations of one or more RS symbols and one or more data symbols within the sTTI may be identified. The RS configuration, along with the allocation of uplink resources, may be provided to a user equipment (UE) which may transmit uplink communications using the allocated uplink resources.