Dynamic TTI Configuration for LTE Uplink Resource Multiplexing
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Solution Overview
Problem
The current LTE system is limited by using only one fixed TTI length, leading to inefficiencies in traffic transmission, as it cannot fully utilize resources when user equipment (UE) has multiple traffics with different features and quality of service (QoS) requirements, resulting in incorrect multiplexing of packets into the same transport block and underutilization of resources.
Innovation Solution
Configuring transmission time intervals (TTIs) of different lengths for data radio bearers (DRBs) and uplink grants, allowing the UE to establish multiple data processing entities and uplink shared channels corresponding to each TTI length, enabling the UE to transmit multiple transport blocks simultaneously and avoid incorrect multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If only one fixed TTI length is used in the LTE system, then the system structure is simple and easy to implement, but the transmission efficiency is low and resources cannot be fully utilized when handling multiple traffics with different QoS requirements
Solution Approach 1:
The patent segments the single TTI scheduling mechanism into multiple TTI length configurations (e.g., 1ms and 0.5ms TTIs). Each traffic type is assigned to a specific TTI length based on its QoS requirements, allowing the system to handle diverse traffic patterns efficiently while maintaining manageable complexity through structured configuration management.
Solution Approach 2:
The patent introduces dynamic TTI length selection where the system can adaptively choose between different TTI lengths (1ms, 0.5ms) based on traffic characteristics and QoS requirements. This dynamic adjustment enables the system to optimize transmission efficiency for different traffic types without requiring complete system redesign.
2Reliability
If the UE multiplexes packets of different traffic types into the same transport block, then the multiplexing process is simple, but incorrect multiplexing occurs when packets with different TTI length requirements are combined
Solution Approach 1:
The patent segments the transport block structure by creating separate transport blocks for different TTI lengths. Packets requiring 1ms TTI are placed in one transport block, while packets requiring 0.5ms TTI are placed in another transport block. This segmentation prevents incorrect multiplexing by ensuring that packets with different TTI requirements are transmitted through dedicated transport blocks.
Solution Approach 2:
The patent applies local quality by assigning different multiplexing rules and characteristics to different transport blocks based on their TTI length requirements. Each transport block is optimized for its specific TTI length, with appropriate formatting, scheduling, and transmission parameters tailored to the specific traffic type and TTI configuration.
3Productivity
If the UE can only transmit one transport block at each TTI, then the transmission mechanism is simple, but resources are underutilized when the UE has multiple types of traffics waiting for transmission
Solution Approach 1:
The patent merges multiple transport blocks with different TTI lengths (1ms and 0.5ms) into the same uplink transmission opportunity. The UE can simultaneously transmit multiple transport blocks corresponding to different traffic types and QoS requirements, thereby fully utilizing available uplink resources and avoiding the underutilization that occurs with single transport block transmission.
Solution Approach 2:
The patent adds a new dimension to the transmission mechanism by introducing multiple TTI length configurations (time dimension segmentation). Instead of being constrained to a single TTI length, the system operates across multiple TTI length dimensions, allowing the UE to transmit multiple transport blocks with different TTI characteristics simultaneously, thus expanding resource utilization capabilities.
Data Source
AI summary
A data transmission apparatus, applicable to a UE, the apparatus includes a receiver configured to receive configuration information about data radio bearers (DRBs), the configuration information indicating TTI length to which each DRBs for the UE corresponds, the DRBs being configured by radio resource control (RRC), and receive one or more uplink grant, each of the uplink grants of the one or more uplink grants corresponding to a TTI length different from another TTI length of another uplink grant, a transmitted configured to transmit data using an uplink shared channel corresponding to each TTI length according to an uplink grant in the one or more uplink grants.