Cell State Control via Dual-Indicator Signaling
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently managing the operational states of serving cells in Carrier Aggregation (CA) configurations, particularly with the introduction of a 'dormant' state, which requires new signaling mechanisms incompatible with existing legacy systems, leading to increased signaling overhead and complexity.
Innovation Solution
The implementation of 'first' and 'second' indicators for cell state control, allowing for single-bit per cell signaling in legacy scenarios and two-bit per cell signaling for absolute state control, enabling seamless transition between activated, deactivated, and dormant states without altering existing network standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new signaling mechanism is introduced to support the dormant state, then full three-state control (activated, deactivated, dormant) is achieved, but compatibility with legacy systems is lost and signaling overhead increases
Solution Approach 1:
The patent makes the existing activation/deactivation MAC CE serve multiple functions by introducing a dormant bit field. The same MAC CE structure can now indicate activated, deactivated, or dormant states depending on the values of the dormant bit and activation/deactivation bit, eliminating the need for separate signaling mechanisms for each state.
Solution Approach 2:
The patent combines the activation/deactivation control and dormant state control into a single MAC CE structure. The dormant bit field and activation/deactivation bit field are merged within the same control element, allowing unified signaling for all three cell states without requiring separate message formats.
2Adaptability or versatility
If a new signaling mechanism with two-bit per cell signaling is introduced for absolute state control, then full three-state control is achieved, but signaling overhead increases compared to legacy single-bit signaling
Solution Approach 1:
The patent uses a 2-bit dormant bit field that can represent four possible values (00, 01, 10, 11), but only three of these values are utilized to represent the three cell states (dormant, activated, deactivated). This partial use of the available bit combinations allows for efficient encoding while maintaining the ability to indicate all necessary states without wasting signaling capacity.
3Ease of manufacture
If legacy single-bit activation/deactivation MAC CE is used, then compatibility with existing networks is maintained, but control over dormant state is not possible
Solution Approach 1:
The patent segments the cell state control into two independent bit fields within the MAC CE: a dormant bit field and an activation/deactivation bit field. This segmentation allows the dormant state to be controlled independently while maintaining the existing activation/deactivation functionality, enabling backward compatibility while adding new capabilities.
Data Source
AI summary
Example methods and apparatuses provide for the advantageous use of “first” and “second” indicators for cell state control with respect to a wireless communication device. When sent singularly, the first indicator indicates activated/deactivated state transitions according to corresponding sequential state transition logic implemented in the device, and the second indicator indicates activated/dormant state transitions according to corresponding sequential state transition logic implemented in the device. When sent jointly for a given serving cell of the device, the first and second indicators operate as a combinational pair that indicates what the operational state of the cell shall be for the device, irrespective of the current cell state. As an example, then, the foregoing “arrangement” allows the network to use single-bit per cell signaling for many state-control scenarios, including “normal” use of legacy activation/deactivation indicators, while also providing absolute state control via two-bit per cell signaling that does not depend on the current state of the cell.