Base Station MAC Header Omission for URLLC/eMBB Multiplexing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G communication systems face challenges in supporting ultra-reliable low-latency communication (URLLC) due to high overhead from transmission headers, which hinder achieving low latency requirements, especially when handling small-sized URLLC data alongside eMBB data.
Innovation Solution
The base station device omits the logical channel identifier (LCID) and data length information in the MAC header for URLLC data, allowing for multiplexing with eMBB data and reducing overhead by using various header patterns and RRC signaling to convey the necessary information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete MAC headers with LCID and data length information are transmitted for URLLC data, then data transmission reliability is improved, but transmission overhead increases and latency increases
Solution Approach 1:
The patent extracts and removes unnecessary header information (LCID and data length) from MAC headers when transmitting URLLC data. Since URLLC data can be identified through logical channel configuration and the data length is either fixed or inferable, these fields are omitted to reduce overhead and latency while maintaining transmission reliability through alternative identification mechanisms.
Solution Approach 2:
The patent applies partial action by including only the essential MAC header fields required for URLLC data transmission while omitting redundant information. This selective inclusion of header elements reduces overall overhead without compromising the reliability needed for ultra-reliable low-latency communication.
2Measurement precision
If complete MAC headers are used for URLLC data transmission, then data identification accuracy is improved, but transmission overhead increases
Solution Approach 1:
The patent removes redundant identification fields (LCID) from MAC headers for URLLC data. The receiving device can still accurately identify URLLC data through pre-configured logical channel information and data characteristics, eliminating the need for explicit LCID fields and reducing header overhead.
Solution Approach 2:
The patent uses implicit copying of identification information from pre-configured logical channel settings rather than transmitting explicit LCID fields in each MAC header. This allows the receiving device to reconstruct the necessary identification data from stored configurations, reducing overhead while maintaining identification accuracy.
3Productivity
If URLLC and eMBB data are multiplexed on the same carrier, then frequency usage efficiency is improved, but complexity of data handling increases
Solution Approach 1:
The patent segments the handling of URLLC and eMBB data by applying different MAC header formats and processing rules for each data type. URLLC data uses simplified headers with omitted fields, while eMBB data uses complete headers. This segmentation allows efficient multiplexing on the same carrier by providing clear differentiation mechanisms that reduce processing complexity.
Solution Approach 2:
The patent applies local quality by optimizing MAC header structure specifically for URLLC data transmission while maintaining standard headers for eMBB data. This localized optimization reduces overhead for time-critical URLLC traffic without affecting the handling of other data types, enabling efficient multiplexing with differentiated quality characteristics.
Data Source
AI summary
A base station device including: a transmitter configured to transmit, for each logical channel, first data of a first type and second data of a second type; and processor circuitry configured to: omit information about a data length of the second data in a MAC protocol data unit (PDU), place a medium access control (MAC) header in front of a MAC service data unit (MSDU) of the second data, and multiplex the first data and the second data, wherein the data length of the second data is omitted from the MAC header and an R bit (reserved bit) is set in the first bit of the first octet in the MAC header.