Bearer Configuration for Dual Connectivity Data Duplication
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Solution Overview
Problem
In dual connectivity transmission systems, especially in DC scenarios, the Master Cell Group (MCG) bearer's independence from the Slave Node (SN) leads to uncertainty about the MAC CE format, causing issues with RRC signaling for bearer establishment or release, resulting in potential misinterpretation by the User Equipment (UE).
Innovation Solution
The first network device configures bearer sequence numbers for both the first and second bearers, ensuring that the difference between the bits to which these sequence numbers are mapped is such that the first bit is always closer to the least significant bit than the second bit, maintaining consistency and avoiding changes in the MAC CE format, even when the first bearer is independent of the second network device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the MCG bearer is configured independently without considering bit position mapping, then the bearer configuration is simple, but the MAC CE format becomes uncertain and may change, causing misinterpretation by the UE
Solution Approach 1:
The patent applies parameter changes by establishing specific constraints on the bit position mapping of bearer sequence numbers. The most significant bit position is determined by the maximum bearer sequence number, and the mapping follows a fixed pattern where bit positions are assigned from most significant to least significant. This parameter-based approach ensures that the MAC CE format remains consistent and predictable, resolving the contradiction between configuration simplicity and format reliability.
2Adaptability or versatility
If the bearer sequence number bit mapping is not standardized, then the configuration process is flexible, but the MAC CE format may change when bearers are established or released, leading to UE misinterpretation
Solution Approach 1:
The patent uses parameter-based control to determine bit positions in the MAC CE format. The most significant bit position is calculated based on the maximum bearer sequence number parameter, and subsequent bit positions are assigned systematically. This approach maintains flexibility in bearer configuration while ensuring that the MAC CE format interpretation remains accurate and consistent, preventing information loss.
Solution Approach 2:
The patent implements a feedback mechanism where the UE determines the bit position mapping based on the maximum bearer sequence number it receives from the network. This feedback loop ensures that both the network and UE use the same bit mapping rules, maintaining format consistency and preventing misinterpretation while allowing flexible bearer configuration.
3Adaptability or versatility
If the MAC CE format changes dynamically with bearer establishment/release, then the system adapts to different scenarios, but the UE cannot accurately determine the correct format, causing scheduling inconsistencies
Solution Approach 1:
The patent resolves this contradiction by using the maximum bearer sequence number as a determining parameter for the MAC CE format. The most significant bit position is calculated as floor(log2(max_bearer_sequence_number)), and this parameter-based approach ensures that the format is adaptively determined while maintaining precision. The UE can accurately determine the format by knowing the maximum bearer sequence number, eliminating ambiguity.
4Ease of operation
If bearer sequence numbers are mapped without fixed bit position rules, then the configuration is straightforward, but the difference in bit positions between first and second bearers cannot be controlled, causing scheduling errors
Solution Approach 1:
The patent applies parameter-based bit position assignment where the most significant bit position is determined by the maximum bearer sequence number. This systematic approach ensures that the difference in bit positions between first and second bearers is controlled and predictable, maintaining both ease of configuration and mapping precision. The fixed mapping rules make the configuration process straightforward while ensuring accurate bit position differentiation.
Data Source
AI summary
A bearer configuration method and related products are disclosed. The method comprises: a first network device configures a bearer sequence number for at least one first bearer of a terminal, wherein the first bearer and at least one second bearer configured by the first network device for the terminal support a data duplication function, the first network device and a second network device provide dual connectivity (DC) transmission for the terminal, and a difference between a first bit to which a bearer sequence number of each first bearer is mapped and a most significant bit is greater than a difference between a second bit to which a bearer sequence number of each second bearer is mapped and the most significant bit.