SFN CORESET TCI State Activation for Dual TRP Downlink Signaling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing downlink common signaling in single frequency network (SFN) transmission schemes, particularly in scheduling and transmitting control information across multiple transmit-receive points (TRPs) to user equipment (UEs), which affects reliability and coverage, especially in scenarios with high user mobility or signal blockage.
Innovation Solution
The implementation of a method and apparatus that enable UE to receive downlink control information (DCI) with a radio network temporary identifier (RNTI) scheduling downlink common signaling in a common search space (CSS) associated with an SFN control resource set (CORESET) activated with two transmission configuration indicator (TCI) states, allowing for reception from multiple TRPs based on UE capability, enhancing diversity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink common signaling is transmitted from multiple TRPs in SFN scheme, then reliability and coverage are improved, but device complexity and scheduling difficulty increase
Solution Approach 1:
The patent segments the downlink common signaling transmission by associating it with specific TRPs through TCI states. Each TRP can be independently configured with its own TCI state, allowing the signaling to be transmitted from multiple TRPs in a segmented manner rather than as a monolithic multi-TRP transmission, thereby improving reliability while managing complexity through structured segmentation
Solution Approach 2:
The patent applies preliminary action by configuring TCI states and activating them before the actual downlink common signaling transmission. The network configures multiple TCI states for a CORESET in advance, and the UE prepares to receive signaling from multiple TRPs based on pre-configured parameters, reducing scheduling complexity during actual transmission by having preparation done beforehand
2Adaptability or versatility
If TCI states are activated for SFN CORESET to enable multi-TRP reception, then adaptability to UE capabilities is improved, but processing overhead and configuration complexity increase
Solution Approach 1:
The patent implements dynamics by making TCI state activation conditional on UE capability. The network can dynamically decide whether to activate multiple TCI states for an SFN CORESET based on the UE's reported capabilities. This allows the system to adapt its configuration complexity to match the UE's processing capabilities, providing versatility while avoiding unnecessary complexity for UEs that cannot handle multi-TRP reception
3Reliability
If DCI schedules downlink common signaling in CSS with multiple TCI states, then signal diversity is improved, but detection difficulty and processing time increase
Solution Approach 1:
The patent applies local quality by associating different TCI states with different spatial characteristics and TRPs. Each TCI state provides localized quality information about the channel from a specific TRP, allowing the UE to detect DCI with enhanced diversity by exploiting the different spatial qualities provided by multiple TRPs rather than relying on a single homogeneous transmission
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a first transmit-receive point (TRP) and a second TRP, downlink control information (DCI) with a radio network temporary identifier (RNTI) that schedules downlink common signaling. The UE may receive, from one or more of the first TRP or the second TRP based at least in part on the DCI, the downlink common signaling in a common search space (CSS) associated with a single frequency network (SFN) control resource set (CORESET) that is activated with two transmission configuration indicator (TCI) states, wherein the downlink common signaling is received from one or more of the first TRP or the second TRP based at least in part on a UE capability of an SFN transmission scheme for reception of the downlink common signaling. Numerous other aspects are described.