Mobile Station Uplink SPS Control for Secondary Cell Activation
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Solution Overview
Problem
Existing communication methods using Semi-Persistent Scheduling (SPS) and uplink grant-free technologies lack a defined method for controlling the activation/deactivation of serving cells.
Innovation Solution
A communication apparatus with a control unit that manages Semi-Persistent Scheduling for the activation/deactivation of serving cells, enabling efficient control of uplink grant-free communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Semi-Persistent Scheduling or uplink grant-free communication is used to reduce overhead and improve efficiency, then communication overhead is decreased and efficiency is improved, but the method for controlling activation/deactivation of serving cells is not defined, leading to control complexity and reliability issues
Solution Approach 1:
The patent applies preliminary action by pre-configuring SPS parameters and uplink grant-free communication settings before actual transmission. The base station pre-allocates resources and sets up scheduling parameters in advance, so that when activation/deactivation is needed, the control can be executed reliably without ad-hoc configuration issues.
Solution Approach 2:
The patent implements dynamic control mechanisms that allow the system to adaptively activate or deactivate SPS and uplink grant-free communication based on real-time channel conditions, traffic patterns, and serving cell states. This dynamic adjustment ensures both high communication efficiency when active and reliable control when deactivating or reconfiguring.
2Ease of operation
If dynamic scheduling with grants is used for each subframe, then control precision and flexibility are improved, but overhead increases and efficiency decreases
Solution Approach 1:
The patent applies periodic action through Semi-Persistent Scheduling, where resources are allocated periodically at predetermined time intervals rather than dynamically for every subframe. This periodic allocation maintains control flexibility for important adjustments while dramatically reducing overhead and improving communication efficiency by eliminating continuous grant signaling.
Solution Approach 2:
The patent extracts the essential scheduling control functions from every-subframe dynamic grants and concentrates them into periodic SPS activations and selective deactivations. By taking out only the critical control moments rather than continuous control, the system achieves both flexibility where needed and efficiency elsewhere.
3Speed
If uplink grant-free communication is implemented without defined activation/deactivation control, then transmission speed and simplicity are improved, but system reliability and resource management deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where the base station monitors uplink grant-free transmissions and sends activation/deactivation commands based on channel conditions, interference levels, and resource utilization. This feedback loop maintains high transmission speed through grant-free operation while ensuring reliable resource management through centralized control based on real-time system state.
Data Source
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AI summary
A state managing unit configured to control a prescribed communication resource allocating process and a reception processing unit configured to receive a control element (CE) are included. The prescribed communication resource allocating process is a process of allocating a communication resource at a predetermined time interval, and the state managing unit suspends an uplink grant configured for the prescribed communication resource allocating process in a case that the reception processing unit receives an SCell Activation/Deactivation MAC CE for deactivating a secondary cell, or an sCellDeactivationTimer configured for the secondary cell expires, and the state managing unit reinitializes the uplink grant suspended, in a case that the reception processing unit receives the SCell Activation/Deactivation MAC CE for activating the secondary cell after the state managing unit suspends the uplink grant.