SCG Buffer Status Reporting via MCG for Deactivated Secondary Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In new radio (NR) R17, when a secondary cell group (SCG) is in a deactivated state, there is a challenge in triggering SCG activation by a terminal, especially in scenarios where uplink data needs to be transmitted.
Innovation Solution
The method involves determining if the SCG is deactivated and then transmitting target information, which includes buffer data status information, from the terminal through a master cell group (MCG) to a network device. This target information can be in the form of a buffer status report (BSR) or radio resource control (RRC) signaling, using specific logical channel IDs and reserved bits to indicate the SCG's buffer data status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the SCG is in a deactivated state to save resources, then energy consumption is reduced, but the terminal cannot trigger SCG activation properly when uplink data needs to be transmitted
Solution Approach 1:
The patent introduces the MCG as an intermediary carrier to transmit buffer data status information from the terminal to the network device when the SCG is deactivated. This intermediary mechanism allows the terminal to indirectly signal the need for SCG activation through the MCG, resolving the contradiction between energy saving and activation triggering capability.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal reports buffer data status information through the MCG when the SCG is deactivated. This feedback loop enables the network device to perceive the terminal's data buffering state and subsequently trigger appropriate SCG activation actions, solving the activation triggering problem while maintaining energy efficiency.
2Loss of information
If the terminal transmits buffer data status information through the MCG when SCG is deactivated, then the network device can determine the buffer data status, but the transmission process becomes more complex
Solution Approach 1:
The patent makes the MCG serve multiple functions: it continues to handle normal uplink data transmission while also carrying buffer data status information for deactivated SCGs. By making the MCG multi-functional, the patent avoids adding separate dedicated transmission channels, thus reducing the increase in system complexity while ensuring complete information transmission.
Solution Approach 2:
The patent utilizes parameter changes in the MAC subheader (such as reserved bits or specific field configurations) to indicate buffer data status information. By changing the interpretation of existing parameters rather than adding entirely new transmission mechanisms, the patent minimizes the increase in transmission process complexity while maintaining information completeness.
Data Source
AI summary
Embodiments of the present disclosure provide a method and apparatus for transmitting buffer data state information of a secondary cell group. The method comprises: determining that a secondary cell group (SCG) is in a deactivated state; sending target information to a network device by means of a master cell group (MCG); the target information being used to indicate buffer data state information of the SCG. The target information comprises one or more of the following: a target buffer state report (BSR) and target radio resource control (RRC) signaling. The method and apparatus for transmitting buffer data state information a secondary cell group provided in embodiments of the present disclosure can implement the function of a terminal indicating SCG-side buffer data state information.