MAC PDU Processing for Wireless Latency Reduction
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Solution Overview
Problem
The increasing number of user equipment (UEs) in wireless communication systems requires efficient transmission and reception of uplink/downlink data and control information using limited radio resources, while also necessitating reduced latency and compatibility with new radio access technologies.
Innovation Solution
A method for transmitting and receiving data units in wireless communication systems, where the transmitting device processes medium access control (MAC) service data units without waiting for MAC control element construction, allowing for fast MAC PDU processing, and the receiving device identifies MAC control elements by processing MAC PDUs from the end, facilitating efficient communication with reduced latency and compatibility with legacy systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitting device waits for MAC control element construction before processing MAC service data units, then the construction of MAC PDUs can be completed accurately, but the processing time and latency increase
Solution Approach 1:
The patent applies preliminary action by constructing the MAC header and MAC service data units in advance before the MAC control elements are ready. The transmitting device creates a preliminary MAC PDU structure with placeholder positions for control elements, allowing data processing to proceed without waiting for control element construction to complete. This reduces latency while maintaining accuracy by finalizing the MAC PDU structure once all components are available.
2Ease of operation
If the receiving device processes MAC PDUs from the beginning, then the processing follows the natural transmission order, but the identification of MAC control elements becomes more complex
Solution Approach 1:
The patent applies inversion by processing the MAC PDU from the end toward the beginning rather than from the start. Since MAC control elements are located at the end of the MAC PDU structure, this reverse processing approach allows the receiving device to identify and extract control elements first, then process the MAC service data units in their natural transmission order. This simplifies control element detection while maintaining proper processing sequence.
3Adaptability or versatility
If the system supports new radio access technologies with more user equipment, then the communication capacity increases, but the amount of control information and data to be transmitted increases
Solution Approach 1:
The patent applies segmentation by dividing the MAC PDU into distinct segments: MAC header, MAC service data units, and MAC control elements. This structured segmentation allows for efficient multiplexing of multiple data units and control elements within the same transmission resource. The method enables the system to handle increased quantities of control information and data by organizing them into manageable segments that can be processed and transmitted efficiently, supporting multiple UEs and new radio access technologies.
Data Source
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Figure 3
Figure 4(a)~4(b)
AI summary
A transmitting device generates a medium access control (MAC) protocol data unit (PDU), and transmits the MAC PDU. The transmitting device generates the MAC PDU such that the MAC PDU includes at least a MAC service data unit (SDU) and a first MAC subheader of the MAC SDU which is attached immediately after the end of the MAC SDU, or a MAC control element (CE) and a second MAC subheader of the MAC CE which is attached immediately after the end of the MAC CE.