PDCCH Candidate Positioning in Wireless Nodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In Dynamic Spectrum Sharing (DSS) scenarios, the traditional method of Cross-Carrier Scheduling in wireless communication systems faces challenges in configuring positions of Physical Downlink Control Channel (PDCCH) candidates across different cells on shared time-frequency resources, which affects the robustness and performance of both Primary Cells (PCells) and Secondary Cells (SCells).
Innovation Solution
A method is introduced where a node receives information to determine a target carrier, detects signaling in a candidate resource set, and transmits or receives signals to identify time-frequency resources, allowing flexible configuration of PDCCH candidates' positions using Carrier Indicator Field (CIF) values and Time-Division Duplex (TDM) techniques, ensuring robust scheduling and reducing ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an SCell is configured to schedule a PCell in DSS scenarios, then scheduling flexibility and resource utilization are improved, but ambiguity in PDCCH candidate positioning and scheduling robustness deteriorate
Solution Approach 1:
The patent segments the time-frequency resources into distinct search space sets, where each search space set is associated with a specific carrier (PCell or SCell). This segmentation allows the terminal to separately manage and detect PDCCH candidates for different carriers, eliminating ambiguity while maintaining the flexibility of SCell-to-PCell scheduling.
Solution Approach 2:
The patent applies local quality by configuring different search space set parameters (such as monitoring occasions, candidate counts, and resource locations) specifically for SCell-to-PCell scheduling scenarios. This localized configuration optimizes the PDCCH detection performance for cross-carrier scheduling while preserving the robustness requirements for PCell scheduling.
2Productivity
If PDCCH candidates are positioned on shared time-frequency resources for multiple cells, then resource efficiency is improved, but detection precision and positioning accuracy deteriorate
Solution Approach 1:
The patent resolves the positioning ambiguity by introducing an additional dimension of differentiation through search space set identities and associated carrier indicators. Even though PDCCH candidates share the same time-frequency resources, each candidate is uniquely identified by its search space set configuration, which is linked to a specific carrier, thereby maintaining positioning accuracy while enabling resource sharing.
Solution Approach 2:
The search space set configuration acts as an intermediary between the shared time-frequency resources and the specific carriers. It provides the necessary mapping information that allows the terminal to correctly identify which PDCCH candidate belongs to which carrier, thus maintaining positioning accuracy while enabling efficient resource sharing across multiple cells.
Data Source
AI summary
The present disclosure provides a method and device in a node for wireless communications. A first node first receives first information, the first information being used for determining a target carrier; then detects a first signaling in a first candidate resource set; and when the first signaling is detected, operates a first signal in a first carrier, and the first signaling is used for determining time-frequency resources occupied by the first signal; the first signaling carries a first identifier, and the first identifier is used for identifying the first carrier; the first candidate resource set comprises a positive integer number of candidate resource group(s), and the first signaling occupies a candidate resource group in the first candidate resource set. The present disclosure configures different Carrier Indicator Fields (CIFs) for the first carrier to optimize the mode of blind detection, thus improving performance of the system.