Dynamic CORESET Configuration via Piggyback DCI
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently configuring control resource sets and search spaces, particularly in dynamically scheduling downlink resources for user equipment (UE) in 5G New Radio (NR) systems, which can lead to increased latency and reduced flexibility in resource allocation.
Innovation Solution
The method involves configuring a first and second control resource set (CORESET) and transmitting piggyback downlink control information (DCI) in a downlink data channel using resources between these CORESETs to alter one or more third CORESETs, allowing for dynamic activation, modification, or deactivation of control resources, thereby optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional static CORESET configuration methods are used, then system complexity is reduced, but scheduling flexibility and adaptability deteriorate
Solution Approach 1:
The patent implements dynamic CORESET configuration by allowing the network to activate, deactivate, or modify CORESETs based on real-time traffic conditions. The MAC CE message enables dynamic switching between different CORESET configurations, transforming the static configuration system into a dynamic one that adapts to changing network conditions, thereby improving scheduling flexibility without requiring complete reconfiguration.
Solution Approach 2:
The patent changes the configuration parameters of CORESETs dynamically by transmitting MAC CE messages that contain activation/deactivation indicators and configuration modification information. This allows the system to adjust CORESET parameters (such as frequency resources, time resources, and association with search spaces) based on traffic demands, achieving adaptability through parameter modification rather than structural redesign.
2Productivity
If dynamic CORESET configuration is implemented, then resource allocation efficiency is improved, but latency increases due to additional signaling
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple CORESET configurations in advance through RRC signaling. The network prepares several possible CORESET configurations beforehand, and the MAC CE message only needs to activate or switch between these pre-prepared configurations. This eliminates the need for real-time configuration computation and reduces the time required for dynamic reconfiguration, thereby reducing latency while maintaining resource allocation efficiency.
Solution Approach 2:
The patent segments the configuration process into two distinct phases: (1) RRC layer pre-configuration of multiple CORESET options, and (2) MAC layer activation/switching between pre-configured options. This segmentation allows the time-consuming configuration work to be done in advance during idle periods, while the actual switching operation is fast and simple, thus reducing overall configuration latency.
3Quantity of substance
If piggyback DCI in downlink data channel is used, then control information transmission capacity is increased, but reliability deteriorates due to shared resources
Solution Approach 1:
The patent applies universality by using the downlink data channel (PDSCH) to serve multiple functions: both data transmission and control information transmission (CORESET activation/deactivation). The MAC CE message embedded in the downlink data channel carries control information for CORESET configuration, allowing the same physical channel to fulfill dual purposes. This increases control information transmission capacity without requiring separate dedicated control channels, while the existing PDSCH reliability mechanisms still apply.
Data Source
AI summary
A scheduling entity can schedule regular or periodic control resources (CORESETs) that are relatively sparse in the time domain compared to dynamic CORESETS. Sparsely scheduled regular CORESETs can reduce the overhead incurred by a user equipment for monitoring the control channels in the CORESETs or search spaces. When the network has a burst of data to send, the scheduling entity can use downlink control information (DCI) piggybacked in physical downlink shared channel (PDSCH) resources to schedule dynamic CORESETs between the regular CORESETs. The dynamic CORESETs can provide resources for a PDSCH and/or physical downlink shared channel (PUSCH).