RLC Entity Selection for Split Transmission in NR Terminals
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Solution Overview
Problem
In New Radio (NR) systems, determining an RLC entity for split transmission when duplication transmission is deactivated is challenging, especially when multiple RLC entities are configured for a bearer, as existing methods lack clear criteria for selecting primary and secondary RLC entities for efficient data transmission.
Innovation Solution
A wireless communication method where a terminal device determines an RLC entity for transmitting PDCP PDUs based on cell groups corresponding to primary and secondary RLC entities, and maps PDCP data volume pending for transmission accordingly, using indication information from the network device to identify appropriate RLC entities for split transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple RLC entities are configured for a bearer to improve transmission reliability, then reliability is improved, but device complexity increases due to difficulty in determining which RLC entity to use for split transmission
Solution Approach 1:
The patent changes the parameter of RLC entity configuration from a static setup to a dynamically selectable configuration. By introducing indication information that can specify different RLC entities for primary and secondary roles, the system adapts the parameter configuration based on transmission conditions, resolving the contradiction between having multiple RLC entities for reliability and the complexity of selecting among them.
Solution Approach 2:
The patent introduces indication information as an intermediary element that mediates between the network device and terminal device for RLC entity selection. This intermediary carries the necessary selection criteria, allowing the terminal to determine the appropriate RLC entity for split transmission without complex local decision-making logic, thus reducing device complexity while maintaining reliability.
2Loss of energy
If duplication transmission is deactivated to reduce resource consumption, then resource efficiency is improved, but transmission reliability deteriorates when split transmission conditions are met
Solution Approach 1:
The patent applies dynamics by enabling the transmission mode to switch between duplication and split transmission based on meeting specific conditions. When duplication is deactivated, the system can dynamically transition to split transmission if conditions are met, ensuring reliability is maintained while allowing resource efficiency to improve when duplication is not needed.
Solution Approach 2:
The patent changes the transmission mode parameter dynamically based on condition satisfaction. By allowing the system to switch between duplication transmission and split transmission modes, it optimizes resource consumption while maintaining transmission reliability through appropriate mode selection.
3Productivity
If split transmission is implemented to improve data throughput, then productivity is improved, but device complexity increases due to lack of clear criteria for RLC entity selection
Solution Approach 1:
The patent introduces indication information as an intermediary that provides clear criteria for RLC entity selection in split transmission. This intermediary element resolves the complexity issue by delivering explicit selection instructions from the network side, enabling high-throughput split transmission without burdening the terminal with complex determination logic.
Solution Approach 2:
The patent changes the selection criteria parameter from undefined to clearly specified through indication information. This parameter change enables efficient split transmission for improving productivity by providing unambiguous guidance on which RLC entities to use, eliminating the complexity of ad-hoc selection.
Data Source
AI summary
Implementations of the present disclosure provide a wireless communication method and a terminal device. In the case that a duplicate transmission of a first bearer is deactivated, a terminal device can determine an RLC entity of the split transmission. The wireless communication method includes: in the case that a duplicate transmission of a first bearer is deactivated, a terminal device determines, according to cell groups corresponding to a primary RLC entity and a secondary RLC entity in at least three RLC entities configured for the first bearer, an RLC entity that transmits a PDCP PDU, and/or a terminal device determines, according to cell groups corresponding to a primary RLC entity and a secondary RLC entity in at least three RLC entities configured for the first bearer, an MAC entity that maps the data amount of a PDCP to be transmitted.