Cross-Carrier Scheduling for Primary Cell Control Signaling
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Solution Overview
Problem
Current communication systems face challenges in efficiently managing cross-carrier scheduling, particularly in reducing the burden of control signaling on primary cells and preventing interference from secondary cell deactivation, while ensuring reliable data transfer and acknowledgment handling across multiple cells.
Innovation Solution
Implementing cross-carrier scheduling methods that allow secondary cells to schedule primary cells, enabling self-scheduling and coordinated switching between scheduling mechanisms, and using a single downlink control information (DCI) to manage multiple cells, with acknowledgments transmitted in a single physical uplink control channel (PUCCH).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cross-carrier scheduling is implemented with secondary cells scheduling primary cells, then the overhead on primary cells is reduced, but the complexity of scheduling mechanisms increases
Solution Approach 1:
The patent extracts the control signaling function from the primary cell and relocates it to secondary cells. The secondary cell is configured to transmit downlink control information (DCI) for scheduling both its own data transmissions and the primary cell's data transmissions, thereby removing the burden of control signaling from the primary cell and reducing its overhead.
Solution Approach 2:
The secondary cell is赋予 dual functionality: it serves both as a data transmission carrier and as a scheduling control carrier for the primary cell. The same secondary cell handles both its own PDSCH/PUSCH scheduling and the primary cell's PDSCH/PUSCH scheduling, making it a multi-functional component that reduces overall system overhead.
2Productivity
If secondary cell deactivation is allowed, then resource efficiency is improved, but interference and scheduling conflicts may occur
Solution Approach 1:
The patent establishes preliminary coordination mechanisms before secondary cell deactivation occurs. The network device coordinates the timing and process of deactivation with the scheduling operations, ensuring that ongoing scheduling tasks are properly handled and acknowledged before the secondary cell is fully deactivated, thus preventing scheduling conflicts and maintaining reliability.
Solution Approach 2:
The patent implements feedback mechanisms through acknowledgment channels that remain active during the deactivation transition. The user equipment provides scheduling acknowledgments for both the primary and secondary cells, and the network device uses this feedback to coordinate the deactivation process, ensuring that no scheduling operations are lost or conflicted during the transition.
3Adaptability or versatility
If multiple scheduling mechanisms are used for primary cell, then scheduling flexibility is improved, but coordination complexity increases
Solution Approach 1:
The patent introduces a coordinating entity (the network device/base station) that acts as an intermediary between multiple scheduling mechanisms. This intermediary manages the interactions between self-scheduling on the primary cell and cross-carrier scheduling via secondary cells, resolving conflicts and coordinating resource allocation to maintain flexibility while managing complexity centrally rather than distributing it across multiple devices.
Data Source
AI summary
A device may include a transceiver configured to access a communication network including a primary cell and a secondary cell, and a device controller configured to receive, on the secondary cell, scheduling information for the primary cell, and monitor a common search space for the primary cell. The device controller may be configured to selectively monitor the common search space for broadcast information. The device controller may be configured to selectively monitor the common search space based on a type of the common search space on the primary cell. A method may include scheduling, by a first scheduling mechanism, a primary cell, wherein the first scheduling mechanism comprises scheduling the primary cell by a secondary cell, scheduling, by a second scheduling mechanism, the primary cell, and deactivating the secondary cell based on switching from the first scheduling mechanism to the second scheduling mechanism. The second scheduling mechanism may include self-scheduling.