Uplink Multi-Beam Operation for Wireless Reliability
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Solution Overview
Problem
Current wireless communication systems face challenges in ensuring reliable uplink multi-beam operation, particularly in maintaining communication robustness and efficiency across different transmission time intervals and beams, which affects the overall performance and reliability of wireless communications.
Innovation Solution
The implementation of a system that enables user equipment (UE) to transmit repetitions of uplink signals using different transmission beams during various transmission time intervals, based on downlink control signals and beam cycling schemes, with the base station transmitting control messages to indicate the resources and beams for multi-beam operation, enhancing beam diversity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE transmits uplink signals using multiple transmission beams across different TTIs, then reliability and robustness are improved through beam diversity, but device complexity and processing requirements increase
Solution Approach 1:
The patent segments the uplink transmission process into multiple Transmission Time Intervals (TTIs), where each TTI uses a different transmission beam. This segmentation allows the UE to divide the overall transmission task across multiple time intervals and spatial directions, improving reliability through beam diversity while managing complexity by structuring the transmission in discrete, manageable units.
Solution Approach 2:
The patent implements periodic beam cycling where the UE transmits repetitions of uplink signals in a periodic manner across different TTIs using different beams. This periodic action pattern allows the system to achieve beam diversity benefits while maintaining a structured, predictable transmission rhythm that simplifies scheduling and resource management.
2Reliability
If beam cycling schemes are implemented to enhance beam diversity, then coverage and reliability are improved, but control signaling overhead and system complexity increase
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure the beam cycling scheme and pre-assign specific transmission beams to specific TTIs through downlink control signals. This preliminary configuration allows the UE to know in advance which beams to use when, reducing real-time decision complexity at the base station while maintaining reliable beam diversity.
Solution Approach 2:
The patent uses downlink control signals as an intermediary mechanism to convey beam cycling configuration information from the base station to the UE. This intermediary approach allows the base station to manage beam cycling complexity centrally while enabling the UE to autonomously execute the configured beam pattern, separating control functions from execution functions.
3Reliability
If multiple repetitions of uplink signals are transmitted across different TTIs using different beams, then robustness against link degradation is improved, but transmission time and latency increase
Solution Approach 1:
The patent implements dynamic beam switching where the UE changes transmission beams dynamically across different TTIs based on the configured beam cycling scheme. This dynamic approach allows the system to adapt to varying channel conditions by selecting appropriate beams for each TTI, improving robustness against link degradation while managing transmission time through efficient beam selection.
Solution Approach 2:
The patent changes the spatial parameter (beam direction) across different TTIs while maintaining the same uplink signal content. By varying the beam parameter over time, the system achieves diversity against link degradation without requiring multiple complete signal transmissions, thus managing the time overhead more efficiently.
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AI summary
Methods, systems, and devices for wireless communications are described. A base station may transmit, and a user equipment (UE) may receive, a downlink control signal indicating that an uplink control signal is to be transmitted using two or more transmission beams during different transmission time intervals (TTIs). The UE may identify the two or more transmission beams based at least in part on the downlink control signal, and may transmit a plurality of repetitions of an uplink signal on the two or more transmissions beams. Each repetition may be transmitted on a different TTI using a different one of the two or more transmission beams based at least in part on the downlink control signal.