Adaptive URLLC Uplink Frequency Switching for Reliable Retransmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in meeting the stringent latency and reliability requirements for Ultra-Reliable Low-Latency Communications (URLLC), particularly in overcoming fading and errors in open loop power controls during uplink transmissions.
Innovation Solution
Adapting uplink transmissions for URLLC by employing multiple transmissions with adaptive retransmissions, progressive terminations, or a hybrid approach, using a UE to transmit in a reserved frequency region and adjust to a second frequency region based on network grants for improved reliability and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If open loop power control is used for uplink transmissions, then the system complexity is reduced, but reliability deteriorates due to fading and errors
Solution Approach 1:
The patent implements closed-loop power control where the network entity provides feedback to the UE about transmission quality. The UE adjusts its transmit power based on this feedback to overcome fading and errors, thereby improving reliability while maintaining manageable system complexity through automated feedback-based adjustment.
Solution Approach 2:
The patent introduces dynamic power adjustment mechanisms where transmit power is not fixed but adapts in real-time based on channel conditions and network feedback. This dynamic approach allows the system to respond to fading and errors, improving transmission reliability without requiring overly complex predetermined control schemes.
2Reliability
If multiple transmissions with adaptive retransmissions are employed, then reliability is improved, but latency increases
Solution Approach 1:
The patent employs pre-scheduled retransmission opportunities and prepares transmission resources in advance. By having predetermined retransmission slots and pre-configured adaptive mechanisms ready, the system can quickly respond to transmission failures without excessive waiting time, thus improving reliability while minimizing latency.
Solution Approach 2:
The patent implements early termination of retransmission sequences when successful delivery is achieved. If a transmission succeeds on the first attempt or early retransmission, the system skips unnecessary subsequent retransmissions, thereby reducing overall latency while maintaining high reliability through the availability of backup retransmission opportunities.
3Object-affected harmful factors
If frequency region adaptation is implemented, then interference is reduced, but system complexity increases
Solution Approach 1:
The patent uses network-based feedback mechanisms where the network entity monitors interference conditions and provides guidance to UEs about suitable frequency regions. This feedback-driven approach allows dynamic frequency adaptation to reduce interference while keeping UE complexity manageable through centralized network control and automated UE response.
Solution Approach 2:
The network entity acts as an intermediary that coordinates frequency region assignments between multiple UEs and transmissions. By centralizing frequency adaptation control in the network, the system can optimize interference management across the cell while reducing the computational burden on individual UEs, thus lowering overall system complexity.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method and apparatus for adapting uplink transmissions during wireless communications are described. The method and apparatus include transmitting, by a user equipment (UE) operating in a Ultra-Reliable Low-Latency Communications (URLLC) mode, a first transmission to a network entity in a first frequency region, the first frequency region corresponding to a reserved frequency division multiplexing (FDM) region of an uplink channel. The method and apparatus include receiving an downlink grant from the network entity in response to transmitting the first transmission, the downlink grant indicating at least a second frequency region for uplink transmissions different from the first frequency region. The method and apparatus include adapting the first frequency region to the second frequency region for transmitting one or both of a retransmission or a subsequent transmission based on the downlink grant.