Uplink Roundtrip Time Optimization in Dual Connectivity
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Solution Overview
Problem
Current wireless communication systems, particularly in evolved universal terrestrial radio access network (EUTRAN) dual connectivity (EN-DC), face challenges in achieving efficient uplink roundtrip times due to inadequate transmission configurations, leading to suboptimal power consumption, spectral efficiency, and reliability.
Innovation Solution
The implementation of specific transmission timelines for user equipment (UE) in dual connectivity mode, utilizing combinations of primary cell TDD UL-DL configurations and DL-reference UL-DL configurations, which include at least three uplink or downlink subframes within a ten-subframe cycle, to optimize uplink feedback roundtrip times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional transmission configurations are used in EN-DC, then device complexity is reduced, but uplink roundtrip time efficiency and communication reliability deteriorate
Solution Approach 1:
The patent applies parameter changes by configuring specific TDD UL-DL configuration indices (0, 6) for the primary cell and DL-reference UL-DL configuration indices (2, 4, 5) for the secondary cell, creating optimized transmission timelines that improve uplink roundtrip time efficiency while managing device complexity through standardized configuration parameters
Solution Approach 2:
The patent implements dynamic transmission timelines that adapt to different dual connectivity scenarios, allowing the system to dynamically select appropriate configuration combinations based on operational requirements, thereby optimizing productivity without requiring permanent complex configurations
2Productivity
If transmission timelines with at least three uplink or downlink subframes are configured, then spectral efficiency and data rates improve, but power consumption increases
Solution Approach 1:
The patent utilizes parameter changes by selecting specific configuration indices that create transmission timelines with at least three consecutive uplink or downlink subframes, optimizing spectral efficiency and data rates while the system manages power consumption through these configured parameters
3Reliability
If traditional HARQ feedback timing is used, then device complexity is maintained, but communication reliability and latency performance deteriorate
Solution Approach 1:
The patent applies parameter changes by establishing specific HARQ feedback timing relationships based on the configured TDD UL-DL and DL-reference UL-DL configurations, enabling reliable communication with reduced latency through standardized feedback timing parameters rather than complex custom configurations
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station and while operating in a dual connectivity mode, an uplink grant in a first subframe of a set of subframes. The uplink grant may schedule transmission of uplink data. The UE may determine a second subframe of the set of subframes to transmit the uplink data and a third subframe of the set of subframes to monitor for feedback associated with transmission of the uplink data. The second subframe and the third subframe may be determined based on combinations of a primary cell time division duplex (TDD) uplink-downlink (UL-DL) configuration and a DL-reference UL-DL configuration. each of the combinations may have at least three uplink transmission subframes or three downlink monitoring subframes within a ten-subframe cycle. The UE may thus perform wireless communications in accordance with the transmission timelines.