PDCP Header Compression Across Cell Group Dormant Activation
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Solution Overview
Problem
In next-generation mobile communication systems, there is a need to reduce data transmission/reception delays and battery consumption associated with the activation and deactivation of carrier aggregation or dual connectivity due to the requirement for control channel monitoring in multiple cells.
Innovation Solution
A new dormant mode or suspension mode is introduced at the bandwidth part, cell, or cell group level, allowing rapid activation and deactivation of carrier aggregation or dual connectivity, with base station-assisted channel measurement and reporting to minimize processing delays and conserve battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple cells are maintained in activated state for carrier aggregation or dual connectivity, then data transmission rate is improved, but battery consumption increases due to control channel monitoring in each cell
Solution Approach 1:
The patent segments the cell activation state into three distinct modes: activated state (full control channel monitoring), dormant state (suspended control channel monitoring with maintained configuration), and deactivated state (configuration release). This segmentation allows the terminal to selectively monitor control channels only when necessary, reducing battery consumption while maintaining data transmission capability when needed.
Solution Approach 2:
The patent introduces dynamic state transitions between activated, dormant, and deactivated modes based on data transmission requirements. The terminal can rapidly switch between these states without full reconfiguration, enabling adaptive power management that responds to changing traffic conditions while maintaining high data transmission rates when active.
2Use of energy by moving object
If multiple cells are deactivated to reduce battery consumption, then power efficiency is improved, but data transmission/reception delay increases due to activation delay
Solution Approach 1:
The patent implements preliminary action by maintaining cell configuration information in the dormant state without releasing it during deactivation. This allows the terminal to quickly transition from dormant or deactivated states back to activated state when data transmission is needed, as the configuration is already prepared and only activation signaling is required, thus reducing activation delay while maintaining power efficiency.
Solution Approach 2:
The dormant state serves as an intermediary state between activated and deactivated modes. In this intermediate state, configuration information is preserved but control channel monitoring is suspended, allowing rapid transition to activated state without full reconfiguration, thereby reducing activation delay while maintaining power savings.
3Device complexity
If cell activation procedure is simplified by releasing configuration upon deactivation, then device complexity is reduced, but activation delay increases due to reconfiguration requirement
Solution Approach 1:
The patent applies local quality by differentiating the handling of configuration information based on the target state. When transitioning to dormant state, configuration is preserved locally without full release. When transitioning to deactivated state, configuration is released. This selective approach reduces activation delay for dormant transitions while maintaining acceptable complexity levels.
Solution Approach 2:
The patent performs preliminary action by maintaining configuration information in the dormant state, so that when activation is needed, the configuration is already in place and only activation signaling is required. This preliminary preservation of configuration reduces the activation procedure complexity and delay compared to full reconfiguration from deactivated state.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal in a wireless communication system is provided. The method includes identifying whether a packet data convergence protocol (PDCP) entity is suspended in case that the PDCP entity re-establishment is requested from an upper layer, identifying whether an indicator is configured for indicating that an uplink data compression (UDC) is continuously used and a PDCP service data unit (SDU) is compressed, for an acknowledged mode (AM) data radio bearer (DRB) whose the PDCP entity is not suspended, and submitting the PDCP SDU, in case that the indicator is configured for indicating that the UDC is continuously used and the PDCP SDU is compressed.