Cross-Carrier Scheduling Search Space Configuration
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Solution Overview
Problem
In carrier aggregation technologies, cross-carrier scheduling often results in a waste of transmission resources due to the inability to schedule multiple subframes on different carriers simultaneously, leading to inefficient use of transmission time units.
Innovation Solution
A method and apparatus for determining and configuring search spaces of downlink control channels across multiple transmission time units on a first carrier to be scheduled in a cross-carrier manner, allowing for the efficient utilization of transmission resources by aligning and scheduling multiple subframes on another carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If one subframe on one carrier schedules only one subframe on another carrier in cross-carrier scheduling, then the scheduling mechanism is simple to implement, but transmission resources are wasted because multiple subframes cannot be scheduled simultaneously
Solution Approach 1:
The patent merges multiple search spaces for different subframes into a unified search space structure. Instead of having separate search spaces for each subframe on the first carrier, the invention combines them into a single search space that can schedule multiple subframes simultaneously, thereby reducing resource waste while maintaining implementation feasibility
Solution Approach 2:
The downlink control channel in the second carrier is designed to have multi-functional capability, where a single control channel can schedule multiple subframes on the first carrier. This universal scheduling approach allows one control channel to perform the function of multiple control channels, improving resource utilization without significantly increasing system complexity
2Adaptability or versatility
If aggregated carriers use different transmission time units due to service differentiation, then service flexibility is improved, but cross-carrier scheduling efficiency deteriorates because one transmission time unit can schedule only one subframe on another carrier
Solution Approach 1:
The patent introduces a new dimensional approach by allowing one transmission time unit on the second carrier to schedule multiple transmission time units on the first carrier across different time dimensions. This dimensional expansion in the scheduling mechanism enables simultaneous scheduling of multiple subframes with different transmission time unit lengths, thereby maintaining service differentiation while improving scheduling efficiency
Data Source
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AI summary
This application discloses a carrier scheduling method and apparatus. The method includes: determining search spaces of downlink control channels corresponding to at least two first transmission time units on a first carrier, where the at least two first transmission time units are scheduled in one second transmission time unit on a second carrier, and the downlink control channels are in a one-to-one correspondence with the first transmission time units; and obtaining, in the search spaces, the downlink control channels corresponding to the at least two first transmission time units. In this application, a plurality of transmission time units on another carrier are scheduled in a cross-carrier manner, thereby improving transmission resource utilization.