Flexible Cross-Carrier Scheduling in Carrier Aggregation
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Solution Overview
Problem
Current LTE Release 10 systems face inefficiencies in cross-carrier scheduling, particularly in scenarios with unlicensed band carrier aggregation, where high signaling overhead and delay occur due to rigid reconfiguration requirements, leading to reduced scheduling possibilities and system performance losses.
Innovation Solution
A method and apparatus for flexible disabling/enabling of cross-carrier scheduling, where a radio network node allocates component carriers and configures time division duplex configurations, monitoring and transmitting downlink control regions in targeted subframes to enable dynamic scheduling based on detected uplink/downlink grants, reducing signaling overhead and improving resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross-carrier scheduling is rigidly configured in LTE Release 10 systems, then scheduling stability is maintained, but scheduling flexibility and system performance deteriorate due to high signaling overhead and delay
Solution Approach 1:
The patent applies dynamics by enabling flexible disabling/enabling of cross-carrier scheduling based on detected uplink/downlink grants. The system transitions from a static, rigid configuration to a dynamic one where the scheduling mode can be adjusted in real-time according to traffic conditions and grant detections, thereby improving scheduling flexibility while reducing signaling delays associated with frequent reconfigurations.
Solution Approach 2:
The patent changes the parameter of cross-carrier scheduling configuration from a fixed state to a variable state. By detecting uplink/downlink grants and dynamically adjusting whether cross-carrier scheduling is enabled or disabled, the system optimizes performance by changing operational parameters based on real-time conditions rather than maintaining a constant configuration.
2Adaptability or versatility
If cross-carrier scheduling is frequently reconfigured to adapt to changing conditions, then scheduling flexibility improves, but signaling overhead and system complexity increase
Solution Approach 1:
The patent applies preliminary action by detecting uplink/downlink grants in advance and proactively adjusting cross-carrier scheduling configuration before performance degradation occurs. This anticipatory approach allows the system to adapt to changing conditions without requiring complex, frequent reconfigurations, thereby reducing signaling overhead while maintaining scheduling flexibility.
3Productivity
If cross-carrier scheduling is disabled to reduce signaling overhead, then resource allocation efficiency improves, but scheduling capability and system performance deteriorate
Solution Approach 1:
The patent applies dynamics by enabling the system to switch between cross-carrier scheduling enabled and disabled states based on real-time detection of uplink/downlink grants. This dynamic adjustment ensures that cross-carrier scheduling is only disabled when appropriate, maintaining scheduling capability when needed while achieving resource allocation efficiency when conditions permit.
Data Source
AI summary
The invention allows flexible disabling/enabling of cross-carrier scheduling in carrier-aggregated wireless data transmission. In response to detecting a predetermined disabling indication of cross-carrier scheduling of received carrier aggregated wireless data transmission, the disabling indication targeting subframes allocated to uplink in a first component carrier transmitted from a cross-carrier scheduling cell and to downlink in a second component carrier transmitted from a cross-carrier scheduled cell: a downlink control region in the targeted subframes in the second component carrier is monitored for uplink/downlink grants; and in response to detecting an uplink/downlink grant, the detected uplink/downlink grant is utilized in uplink/downlink scheduling of the targeted subframe in the second component carrier.