SCG Activation Without Random Access for Low-Latency 5G Terminals
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing battery consumption and latency when implementing carrier aggregation or dual connectivity, as maintaining active cells leads to increased power usage while deactivating cells results in data transmission delays.
Innovation Solution
A new dormant mode is introduced for RRC connected mode terminals, allowing quick activation and deactivation of carrier aggregation or dual access technologies at the bandwidth part, cell, or secondary cell group level, with channel measurement configurations to facilitate rapid cell activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If cells are kept active to support carrier aggregation or dual connectivity, then service continuity and transmission speed are improved, but battery consumption increases
Solution Approach 1:
The patent implements dynamic cell state management by introducing a dormant mode that allows cells to be quickly activated or deactivated based on service requirements. The terminal can switch between active and dormant states for secondary cell groups, enabling flexible adaptation between power-saving mode and high-performance mode without fixed constraints.
Solution Approach 2:
The patent performs preliminary configuration of cell groups in dormant state with pre-configured parameters including bandwidth part settings, physical channel configurations, and reference signal configurations. This allows rapid activation without full reconfiguration when service is needed, reducing both latency and power consumption during state transitions.
2Use of energy by moving object
If cells are deactivated to save battery power, then energy consumption is reduced, but data transmission latency increases
Solution Approach 1:
The patent enables dynamic switching between dormant and active states for cell groups, allowing the system to quickly transition from power-saving state to transmission state when data needs to be sent. The terminal maintains configuration information in dormant state and can rapidly activate cells without full reconfiguration procedures.
Solution Approach 2:
The patent performs preliminary configuration of cell groups in dormant state with pre-configured parameters including bandwidth part settings, physical channel configurations, and reference signal configurations. This allows rapid activation without full reconfiguration when service is needed, reducing both latency and power consumption during state transitions.
3Reliability
If random access procedure is performed for cell activation, then reliable connection is established, but activation time and complexity increase
Solution Approach 1:
The patent performs preliminary configuration of cell groups in dormant state with pre-configured parameters including bandwidth part settings, physical channel configurations, and reference signal configurations. This allows rapid activation without full reconfiguration when service is needed, reducing both latency and power consumption during state transitions.
Solution Approach 2:
The patent segments the cell group activation process by separating the configuration phase (performed in dormant state) from the activation phase. The configuration includes dividing cell groups into dormant and active states, with specific configurations for bandwidth parts, physical channels, and reference signals for each state, enabling selective and rapid activation.
Data Source
AI summary
A method performed by a terminal in a wireless communication system includes receiving, from a base station, a RRC reconfiguration message, identifying whether a beam failure is detected or whether a time alignment timer is running, based on the RRC reconfiguration message, and in case that the beam failure is not detected or the time alignment timer is running, identifying a SCG activation, without a random access procedure.