Group-common pre-emption indication for URLLC and eMBB coexistence

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Solution Overview

Problem

Wireless communication systems face challenges in accommodating both low latency and latency-tolerant communications using the same time-frequency resources, requiring efficient resource management to meet the diverse needs of different user equipment (UEs) such as ultra-reliable low latency communications (URLLC) and enhanced mobile broadband (eMBB) devices.

Innovation Solution

The system employs a group-common pre-emption indication mechanism, transmitted every K symbols or slots on the physical downlink control channel, to dynamically allocate and pre-empt resources, allowing for the coexistence of low latency and latency-tolerant communications by indicating pre-empted resources with defined granularity, enabling flexible scheduling and interference management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If time-frequency resources are shared between low latency UEs and latency tolerant UEs, then resource utilization efficiency is improved, but communication reliability for low latency UEs deteriorates due to potential pre-emption of allocated resources

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidcommunication reliability for low latency UEs

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The base station performs preliminary scheduling of latency tolerant data in earlier time-frequency resources, then monitors for arriving low latency data. When low latency data arrives, the base station can pre-empt previously allocated resources by sending pre-emption indication information to the latency tolerant UE, allowing the low latency UE to use the resources immediately without waiting for re-scheduling

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Pre-emption indication information acts as an intermediary mechanism between the base station and latency tolerant UEs. This indication carries information about which resources have been pre-empted, allowing latency tolerant UEs to identify and avoid these resources, thereby preventing interference while maintaining overall resource utilization efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If dedicated resources are allocated to low latency UEs to ensure reliability, then communication reliability is improved, but resource utilization efficiency deteriorates due to idle resources when low latency data does not arrive

Engineering Contradiction:

Improvecommunication reliability for low latency UEsVSAvoidresource utilization efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system dynamically adjusts resource allocation between low latency and latency tolerant UEs based on actual traffic conditions. When low latency data arrives, resources are dynamically reassigned from latency tolerant UEs; when no low latency data arrives, the resources remain available for latency tolerant UEs, creating a flexible and adaptive resource allocation mechanism

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The scheduling behavior changes based on the arrival time of low latency data relative to the latency tolerant transmission timeline. The base station monitors whether low latency data arrives before the latency tolerant transmission and adjusts resource allocation parameters accordingly, enabling efficient resource utilization while maintaining reliability when needed

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If pre-emption indication information is transmitted frequently to ensure accurate resource identification, then resource allocation accuracy is improved, but signaling overhead increases

Engineering Contradiction:

Improveresource allocation accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The base station transmits pre-emption indication information selectively rather than continuously. It only sends pre-emption indications when actual pre-emption occurs, avoiding unnecessary signaling when resources remain allocated as scheduled. This partial action approach maintains accurate resource identification when needed while minimizing signaling overhead during normal operation

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS11683828B2System and method for coexistence of low latency and latency tolerant communications

Publication Date: 2023.06.20 HUAWEI TECH CO LTD

AI summary

Systems and methods are provided for transmitting and receiving pre-emption indications. The pre-emption indication is transmitted every K symbols or slots, on a group-common physical downlink control channel. The pre-emption indication is in respect of a group of K symbols or slots preceding a symbol or slot containing the group-common pre-emption indication. The group-common pre-emption indication indicates, for the group of K symbols or slots, which resources are pre-empted. The base station schedules resources for first downlink traffic, and transmits the scheduled first downlink traffic subject to pre-emption, and transmits second downlink traffic by pre-empting resources for the first downlink traffic. On the UE side, the UE receives the pre-emption indication. The UE receives its scheduled traffic taking into account the pre-emption indication.