Uplink SPS PUSCH Data Type Identification via Scrambling

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Solution Overview

Problem

Current wireless communication systems face inefficiencies in uplink transmission, particularly in managing semi-persistent scheduling (SPS) configurations, where distinguishing between new and retransmission data is challenging, leading to suboptimal resource allocation and increased latency.

Innovation Solution

A method and apparatus for user equipment (UE) in a wireless communication system that receives SPS configuration information and transmits PUSCH data with indication information, using a 1-bit indicator, PRB index, DMRS sequence, or scrambling sequence to differentiate between new and retransmission data, allowing for efficient periodic transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If SPS configuration is used for periodic uplink transmission, then resource allocation efficiency is improved, but difficulty in distinguishing new data from retransmission data increases

Engineering Contradiction:
Improveresource allocation efficiencyVSAvoiddata type identification difficulty
Core Design Contradiction:
ProductivityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent uses different scrambling sequences (analogous to color changes) to mark different data types. New SPS data and retransmission SPS data are scrambled with distinct sequences, enabling the base station to easily identify data type through sequence detection without complex signaling overhead.

Inventive Principle:
Principle #32Color changes

Solution Approach 2:

The patent introduces an intermediary indicator field within the SPS configuration that carries data type information. This intermediary element mediates between the transmission content and the receiver's interpretation, allowing clear distinction between new and retransmission data while maintaining efficient periodic scheduling.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Measurement precision

If indication information is added to PUSCH to identify data type, then data transmission accuracy is improved, but device complexity increases

Engineering Contradiction:
Improvedata type identification accuracyVSAvoidUE processing complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges the indication information directly into the existing PUSCH structure by utilizing available fields (such as scrambling sequence selection or indicator bits within the transport block). This integration approach provides accurate data type identification without requiring separate signaling channels or complex additional processing architecture.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The patent changes existing transmission parameters (such as scrambling sequence initialization values or redundancy version selection) to encode data type information. By repurposing existing parameters rather than introducing new ones, the system achieves precise identification while minimizing increases in device complexity.

Inventive Principle:
Principle #35Parameter changes

3Reliability

If SPS retransmission resource allocation is implemented, then transmission reliability is improved, but latency increases

Engineering Contradiction:
Improveuplink transmission reliabilityVSAvoidretransmission latency
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The patent performs preliminary configuration of SPS parameters including periodicity, resource allocation, and data type indicators during initial setup. By pre-configuring all necessary information including retransmission parameters, the system enables rapid retransmission without requiring extensive negotiation or resource allocation procedures at the time of retransmission, thus reducing latency while maintaining reliability.

Inventive Principle:
Principle #10Preliminary action

Data Source

PatentEP3373687B1Method for signal transmission, and apparatus therefor
Publication Date: 2021.03.10 LG ELECTRONICS INC
  • EP3373687B1 patent drawingFigure 1(a)~1(b)
  • EP3373687B1 patent drawingFigure 2
  • EP3373687B1 patent drawingFigure 3

AI summary

The present invention relates to a wireless communication system. Specifically, the present invention relates to a method comprising the steps of: receiving uplink semi-persistent scheduling (SPS) configuration information; and transmitting a physical uplink shared channel (PUSCH) in a subframe which is periodically configured according to the uplink SPS configuration information, wherein the PUSCH includes indication information indicating whether data of the PUSCH is new SPS data or retransmission SPS data, and an apparatus therefor.