Scheduling Restriction for Carrier Aggregation Collision Avoidance
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Solution Overview
Problem
In wireless communication systems, scheduling restrictions arise due to user equipment (UE) capabilities limiting simultaneous receiving and transmitting capabilities across certain frequency ranges, leading to potential collisions in time-domain operations, particularly in carrier aggregation (CA) and dual connectivity (DC) scenarios.
Innovation Solution
The method involves detecting UE capabilities to prioritize activities on one component carrier over another when simultaneous receiving and transmitting are not supported, ensuring that downlink activities are maintained and prioritized over uplink activities in case of collisions, specifically by interrupting non-prioritized activities to perform prioritized ones, thereby avoiding time-domain collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation or dual connectivity is implemented to increase data rate, then throughput is improved, but time-domain collisions occur when UE cannot simultaneously receive and transmit on different component carriers
Solution Approach 1:
The system dynamically adjusts scheduling decisions based on real-time UE capability indicators. When a UE indicates it cannot simultaneously receive and transmit on different component carriers, the network dynamically modifies scheduling to avoid time-domain collisions, thereby maintaining high data rates while ensuring reliable operation for capability-constrained UEs
Solution Approach 2:
The invention changes the scheduling parameters (timing, resource allocation) based on the UE's capability parameters. By detecting whether a UE supports simultaneous Rx/Tx on inter-band carriers, the system adjusts the scheduling configuration to prevent collisions, resolving the contradiction between maintaining high throughput and avoiding scheduling conflicts
2Productivity
If downlink activities are prioritized over uplink activities, then downlink performance is maintained, but uplink transmission may be delayed or interrupted
Solution Approach 1:
The scheduling priority is dynamically determined based on the specific collision scenario and UE capabilities. The system evaluates whether to prioritize downlink or uplink activities in real-time, adjusting priorities to minimize overall performance impact rather than applying a fixed priority rule, thus balancing downlink performance with uplink timing requirements
Data Source
AI summary
One or more methods of operating an access node. At least one of the methods includes: detecting a capability indication that indicates a capability of a user equipment (UE) to simultaneously receive and transmit (Rx/Tx) on a first component carrier (CC1) and a second component carrier (CC2); and scheduling, based at least on the capability, a first UE activity to occur over the CC1 and a second UE activity to occur over the CC2 to avoid a collision in a time-domain by prioritizing one of the first UE activity or the second UE activity relative to the other one of the first UE activity or the second UE activity.