PUSCH HARQ Resource Allocation with Fallback DCI CSI Handling

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Solution Overview

Problem

In LTE, data loss occurs on the Physical Uplink Shared Channel (PUSCH) due to periodic Channel State Information (CSI) reporting, particularly when missed Downlink assignments are scheduled by fallback DCI, leading to incorrect resource allocation and subsequent loss of CSI and data transmission.

Innovation Solution

The solution involves not multiplexing CSI on the PUSCH if it is scheduled by a fallback DCI, specifically DCI format 0_0, thereby preventing data loss by ensuring that CSI is not included in the transmission when the PUSCH is scheduled without an indication of resources for HARQ bits, thus avoiding incorrect resource allocation and data loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If periodic CSI is multiplexed on PUSCH, then channel state information reporting is achieved, but data loss occurs when missed downlink assignments are scheduled by fallback DCI

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidCSI and data loss

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent extracts and removes CSI from the PUSCH transmission when fallback DCI is detected. The wireless device identifies that the PUSCH is scheduled by fallback DCI (DCI format 0_0 without resource indication for HARQ bits) and excludes CSI from the multiplexed transmission, thereby preventing the data loss that would otherwise occur due to incorrect resource allocation between CSI and data.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent implements dynamic behavior where the inclusion of CSI in PUSCH transmission is not fixed but adapts based on the DCI format detected. The wireless device dynamically determines whether to multiplex CSI on PUSCH by checking if the scheduling DCI is fallback DCI, allowing the system to switch between CSI inclusion and exclusion modes based on real-time scheduling conditions.

Inventive Principle:

Principle #15Dynamics

2Productivity

If CSI is multiplexed on PUSCH scheduled by fallback DCI, then resource utilization is maximized, but incorrect resource allocation leads to data loss

Engineering Contradiction:

Improveresource utilizationVSAvoidresource allocation accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent introduces DCI format detection as an intermediary mechanism that mediates between resource utilization goals and resource allocation accuracy. The wireless device uses the DCI format (specifically whether it is fallback DCI format 0_0) as an intermediary indicator to determine resource allocation strategy, preventing direct multiplexing of CSI on fallback-scheduled PUSCH and thereby ensuring accurate resource allocation while maintaining overall system productivity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP3565157B1Physical uplink shared channel with hybrid automatic repeat request acknowledgement

Publication Date: 2021.10.20 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

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AI summary

A method, system and apparatus are disclosed. A wireless device (WD) configured to communicate with a network node is provided. The WD configured to, and/or comprising a radio interface and/or processing circuitry configured to receive a Downlink Control Information (DCI) message for scheduling transmission on a Physical Uplink Shared Channel (PUSCH) in which the DCI message not containing an indication of how many resources to reserve for Hybrid Automatic Repeat Request (HARQ) bits, and optionally, transmit on the scheduled PUSCH based on the DCI message.