Uplink Grant TTI Duration Handling for Flexible Radio Bearer Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in reducing cost per bit, increasing service availability, and managing power consumption while requiring flexible frequency band use and a simplified structure, which are essential for future competitiveness.
Innovation Solution
A method and apparatus for a User Equipment (UE) to receive and transmit data using uplink grants with specific Transmission Time Interval (TTI) duration information, allowing for flexible TTI configurations for multiple radio bearers, and discarding grants without supported TTIs or triggered MAC Control Elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible TTI configurations are implemented for multiple radio bearers, then system adaptability and latency optimization are improved, but device complexity increases due to additional processing requirements for TTI alignment and grant management
Solution Approach 1:
The patent implements dynamic TTI configuration where the Transmission Time Interval can be flexibly adjusted based on radio bearer requirements. The UE dynamically determines TTI duration by examining radio bearer characteristics and selects appropriate TTIs from a set of configured durations, enabling the system to adapt to varying latency and throughput requirements without fixed constraints
Solution Approach 2:
The patent segments the data transmission process by separating different radio bearers into distinct groups based on their TTI requirements. Each radio bearer is assigned to a specific TTI group, allowing independent TTI selection for each group. This segmentation enables the UE to manage multiple bearers with different latency requirements simultaneously without interfering with each other
2Loss of time
If TTI duration is optimized for latency-sensitive bearers, then transmission latency is reduced, but overhead increases due to more frequent transmission cycles and grant signaling
Solution Approach 1:
The patent applies different TTI durations to different radio bearer groups based on their specific requirements. Latency-sensitive bearers are assigned shorter TTIs to minimize transmission delay, while less critical bearers use longer TTIs to reduce overhead. This local optimization ensures that each bearer group receives the TTI configuration that best suits its characteristics without uniformly increasing system-wide overhead
3Reliability
If multiple radio bearers with different TTI requirements are supported, then service availability increases, but device complexity increases due to additional MAC PDU assembly and grant processing
Solution Approach 1:
The patent implements dynamic MAC PDU assembly where the UE dynamically determines which radio bearers to include in each MAC PDU based on their TTI requirements and current scheduling conditions. The UE examines the uplink grant, identifies supported TTIs, and selectively assembles bearers that can be transmitted in the current slot, enabling flexible service availability without rigid processing constraints
Solution Approach 2:
The patent performs preliminary configuration where the eNB pre-configures the UE with a set of possible TTI durations and radio bearer mappings before actual data transmission. This preliminary setup includes providing TTI duration information and establishing bearer-to-TTI associations, so that during actual transmission the UE only needs to reference pre-established configurations rather than performing complex real-time calculations
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for transmitting, by a user equipment (UE), data in a wireless communication system, the method comprising: receiving an uplink grant including first transmission time interval (TTI) duration information; transmitting a Medium Access Control Protocol Data Unit (MAC PDU) using the uplink grant, wherein the MAC PDU includes data associated with at least one radio bearer supporting a TTI duration indicated by the first TTI duration information.