Dynamic QFI Mapping in 5G SDAP Headers
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Solution Overview
Problem
The mismatch in the number of bits between the Quality of Service (QoS) Flow Identity (QFI) carried in the SDAP header and the QFI obtained by User Equipment (UE) in 5G communication systems, which prevents effective communication service implementation.
Innovation Solution
A method that dynamically maps the QFI with a larger number of bits to a QFI with a smaller number of bits by dividing the QFI into two sections, where values less than a preset threshold are mapped directly and values greater than the threshold are mapped to unmapped vacant positions, ensuring compatibility with the existing communication standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the QFI is carried in the SDAP header with a fixed number of bits, then the protocol structure is simplified, but the bit mismatch between SDAP header QFI and UE QFI occurs, preventing communication service implementation
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed QFI bit length in the SDAP header to a dynamic mapping mechanism. The UE dynamically maps the received QFI (with a certain number of bits) to a corresponding QFI value that fits the SDAP header's bit constraint, allowing the system to adapt to bit length differences while maintaining protocol simplicity and enabling reliable communication service implementation.
2Adaptability or versatility
If the QFI bit length is increased to accommodate more QoS flows, then the QoS flow identification capability is improved, but the mismatch with SDAP header QFI bit length occurs
Solution Approach 1:
The patent introduces an intermediary mapping mechanism between the QFI obtained from upper layers (with potentially different bit length) and the QFI to be carried in the SDAP header. This intermediary mapping function reconciles the bit length difference, allowing the system to support extended QoS flow identification capability while maintaining bit length consistency with the SDAP header format.
3Ease of manufacture
If a fixed mapping between QFI values is used, then the mapping process is simplified, but the inability to handle different QFI bit lengths prevents communication service implementation
Solution Approach 1:
The patent transforms the fixed mapping approach into a dynamic one by introducing a mapping function that adapts to different QFI bit lengths. The UE determines the bit length of the received QFI and applies appropriate mapping logic, enabling the system to handle various QFI formats while maintaining a relatively simple mapping process that ensures bit length compatibility with the SDAP header.
Data Source
AI summary
The disclosure relates to the field of wireless communications and provides a method for dynamically indicating a Quality of Service (QoS) Flow Identity (ID) (QFI) and User Equipment (UE). The method includes: a UE obtains a Service Data Adaptation Protocol (SDAP) Service Data Unit (SDU) and obtains a first QFI to which the SDAP SDU belongs; maps the first QFI with a relatively large number of bits to a second QFI with a relatively small number of bits, here, a value of the first QFI is mapped to a value of the second QFI which is the same as the value of the first QFI when a value of the first QFI is less than a first preset threshold and the value of the first QFI is mapped to a value of an unmapped vacant position of the second QFI when the value of the first QFI is greater than the first preset threshold; and then includes the second QFI in an SDAP header. Thus, communication service may be implemented better on the basis of an existing communication standard.