Cross-Carrier Scheduling Minimum Delay Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cross-carrier scheduling in new radio (NR) systems is insufficient, leading to reduced throughput and increased buffering requirements due to differences in subcarrier spacing and transmission time intervals between scheduling and scheduled component carriers.
Innovation Solution
Implementing a minimum scheduling delay to align data transmissions across component carriers, allowing for efficient data reception without unnecessary buffering by identifying a slot delay threshold and receiving data transmissions subsequent to the scheduling grant, thereby optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross-carrier scheduling is implemented without minimum scheduling delay, then scheduling flexibility is improved, but buffering requirements increase and throughput decreases
Solution Approach 1:
The patent introduces a minimum scheduling delay parameter (K0) that defines the minimum time offset between downlink grant reception and corresponding PDSCH reception. By changing this temporal parameter, the system resolves the contradiction between scheduling flexibility and buffering requirements, as UEs only need to buffer data for the specified minimum delay period rather than indefinitely
2Adaptability or versatility
If cross-carrier scheduling is implemented without minimum scheduling delay, then scheduling flexibility is improved, but throughput decreases
Solution Approach 1:
By establishing a minimum scheduling delay parameter, the patent ensures that data transmissions occur after UEs have sufficient processing time, thereby improving throughput through more efficient resource utilization while preserving scheduling flexibility through configurable delay values
3Loss of time
If data transmissions occur immediately after scheduling grant, then latency is reduced, but non-causal symbol processing increases and power expenditure increases
Solution Approach 1:
The patent applies preliminary action by requiring UEs to prepare for data reception in advance of the actual data transmission, specifically by buffering data during the minimum scheduling delay period. This allows UEs to process data causally (after it arrives) rather than non-causally (before it arrives), reducing power expenditure while maintaining low latency through optimized timing
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may implement cross-carrier scheduling. A user equipment (UE) may identify a minimum scheduling delay and may receive a downlink grant on a first CC. The UE may further identify the slot in which a downlink data transmission corresponding to the downlink grant will be received, and may identify the slot such that the minimum scheduling delay is satisfied. The UE may the receive the downlink data transmission, as indicated in the downlink grant, in the identified slot. In some examples, the UE and the base station may alternate between a long minimum scheduling delay and a short minimum scheduling delay. In some examples, the UE and the base station may alternate between a cross-carrier mode, and a self-scheduling mode.