MAC PDU Transmission Using Separate Control Uplink Grants
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Solution Overview
Problem
The challenge in wireless communication systems is the efficient utilization of limited radio resources for transmitting uplink and downlink data and control information, particularly in scenarios where latency and delay are critical, such as in 5G applications like self-driving vehicles and remote healthcare, where ultra-low latency and high reliability are required.
Innovation Solution
A method and apparatus for transmitting a Medium Access Control (MAC) protocol data unit (PDU) based on a control uplink (UL) grant, involving the transmission of information indicating the amount of MAC control elements (CEs) to be transmitted, and constructing the MAC PDU using the UL grant, with prioritization based on CE priority and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single UL grant is used for both data and MAC CE transmission, then resource allocation is simplified, but processing time increases and data rate is reduced
Solution Approach 1:
The patent segments the UL grant into two separate types: data UL grant for uplink data transmission and control UL grant for MAC CE transmission. This segmentation allows each grant to be optimized for its specific purpose, reducing processing time and increasing data transmission rate while maintaining manageable resource allocation complexity through dedicated grant structures.
2Quantity of substance
If MAC CEs are multiplexed with UL data, then resource utilization improves, but processing time and latency increase
Solution Approach 1:
The patent separates MAC CE transmission from UL data transmission by introducing a dedicated control UL grant. This segmentation eliminates the need to multiplex MAC CEs with UL data, thereby reducing processing time and latency while maintaining efficient resource utilization through specialized grant mechanisms for each transmission type.
3Device complexity
If UL grant reception and UL resource allocation are combined, then device complexity is reduced, but processing time increases
Solution Approach 1:
The patent divides the UL grant functionality into separate data UL grant and control UL grant structures. This segmentation allows the UE to directly use the control UL grant for MAC CE transmission without additional resource allocation processing, thereby reducing the time between grant reception and resource allocation while keeping device complexity manageable through standardized grant formats.
Solution Approach 2:
The control UL grant is pre-configured with all necessary resource allocation information specifically for MAC CE transmission. This preliminary action eliminates the need for subsequent resource allocation processing steps, directly reducing the time between UL grant reception and UL resource allocation while maintaining systematic complexity management.
Data Source
AI summary
The present disclosure relates to a method of transmitting a Medium Access Control (MAC) protocol data unit (PDU) by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of based on a first Medium Access Control (MAC) control element (CE) being triggered, transmitting, on a data uplink (UL) grant to a network, information indicating an amount of the first MAC CE to be transmitted; receiving a control UL grant from the network; constructing a MAC protocol data unit (PDU) including the first MAC CE; and transmitting the MAC PDU using the control UL grant.