Control Candidate Monitoring for Mixed-Reliability sTTI Scheduling

Solution Overview

Problem

The increase in control overhead and processing delay in wireless communication systems with shorter transmit time intervals (sTTIs) negatively impacts latency reduction, particularly in LTE systems, due to the complexity of decoding control candidates in each sTTI.

Innovation Solution

Implementing a method and apparatus that adjust the set of control candidates based on the reliability of data packet assignments, where different aggregation levels are used for normal and high reliability data packets, and dynamically update these sets based on channel conditions and expected retransmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If control candidates are monitored in each sTTI to ensure reliable data reception, then reliability is improved, but control overhead and processing delay increase

Engineering Contradiction:

Improvedata packet reception reliabilityVSAvoidcontrol overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by differentiating control candidate monitoring between two types of data packets: normal reliability packets and high reliability packets. For normal reliability packets, the UE monitors a first set of control candidates with standard aggregation levels. For high reliability packets, the UE monitors a second set of control candidates with higher aggregation levels. This localized differentiation ensures that enhanced monitoring is applied only where needed, improving reliability for critical packets without unnecessarily increasing control overhead for all packets.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes parameter changes by dynamically adjusting the aggregation level parameter based on packet reliability requirements. Normal reliability packets use standard aggregation levels (e.g., L=1,2,4,8), while high reliability packets use enhanced aggregation levels (e.g., L=2,4,8,16). The UE determines which set of control candidates to monitor based on the reliability type indicated in the data packet assignment, thereby adapting the monitoring parameters to match the service requirements and reduce unnecessary processing.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If control candidates are monitored in each sTTI to ensure reliable data reception, then reliability is improved, but processing delay increases

Engineering Contradiction:

Improvedata packet reception reliabilityVSAvoidprocessing delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies local quality by differentiating control candidate monitoring between two types of data packets: normal reliability packets and high reliability packets. For normal reliability packets, the UE monitors a first set of control candidates with standard aggregation levels. For high reliability packets, the UE monitors a second set of control candidates with higher aggregation levels. This localized differentiation ensures that enhanced monitoring is applied only where needed, improving reliability for critical packets without unnecessarily increasing control overhead for all packets.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes parameter changes by dynamically adjusting the aggregation level parameter based on packet reliability requirements. Normal reliability packets use standard aggregation levels (e.g., L=1,2,4,8), while high reliability packets use enhanced aggregation levels (e.g., L=2,4,8,16). The UE determines which set of control candidates to monitor based on the reliability type indicated in the data packet assignment, thereby adapting the monitoring parameters to match the service requirements and reduce unnecessary processing.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If aggregation level is increased for high reliability data packets, then reliability is improved, but control overhead increases

Engineering Contradiction:

Improvehigh reliability data packet receptionVSAvoidcontrol channel elements

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent applies local quality by differentiating control candidate monitoring between two types of data packets: normal reliability packets and high reliability packets. For normal reliability packets, the UE monitors a first set of control candidates with standard aggregation levels. For high reliability packets, the UE monitors a second set of control candidates with higher aggregation levels. This localized differentiation ensures that enhanced monitoring is applied only where needed, improving reliability for critical packets without unnecessarily increasing control overhead for all packets.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3905635B1Method and apparatus for monitoring control candidates based on assignments of data packets with different reliabilities

Publication Date: 2025.12.17 LENOVO (SINGAPORE) PTE LTD

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AI summary

A first set of control candidates message can be received (310). The first set of control candidates message can indicate a first set of control candidates with a first set of respective aggregation levels. A data packet assignment can be received (320) in a first transmit time interval. A second set of control candidates with a second set of respective aggregation levels can be determined (330). The first set of control candidates can be monitored (340) in at least one second transmit time interval if the data packet assignment is a normal reliability data packet assignment. The second set of control candidates can be monitored (350) in the at least one second transmit time interval if the data packet assignment is a high reliability data packet assignment.