Uplink Delay Parameter Coordination for 5G Random Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G communication systems face challenges in achieving balanced data transmission reliability and spectrum utilization due to conflicts in grant-free transmission methods, leading to decreased spectrum efficiency and increased power consumption, especially in scenarios requiring massive machine-type communication and ultra-reliable low-latency communication.
Innovation Solution
The method involves carrying a UL delay parameter in downlink control channel information, MAC headers, or fixed-size resource allocation indications, allowing for flexible setting of uplink delays to improve data transmission and reception performances by coordinating the transmission times of user equipment (UE) using the same uplink receiving beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grant-free transmission is used to improve spectrum utilization, then spectrum efficiency increases, but transmission reliability decreases due to conflicts
Solution Approach 1:
The patent changes the time domain parameter by introducing flexible uplink delay parameters (k0, k2, k3) that can be dynamically adjusted based on traffic conditions. This allows the system to optimize between grant-free mode (higher spectrum efficiency) and grant-based mode (higher reliability) by adjusting timing parameters, thereby resolving the contradiction between spectrum utilization and transmission reliability.
2Speed
If grant-free transmission is used to reduce latency, then transmission speed increases, but power consumption increases due to continuous monitoring
Solution Approach 1:
The patent implements dynamic switching between grant-free and grant-based transmission modes based on traffic conditions. When traffic is light, grant-free mode is used for low latency; when traffic is heavy or conflicts are detected, the system switches to grant-based mode. This dynamic adaptation reduces unnecessary power consumption from continuous monitoring while maintaining low latency performance when needed.
3Reliability
If flexible uplink delay parameters are introduced to coordinate transmission times, then transmission reliability improves, but system complexity increases
Solution Approach 1:
The patent segments the uplink transmission process into distinct phases with different delay parameters (k0 for initial transmission, k2 for retransmission, k3 for conflict resolution). Each phase has its own timing parameters that can be independently configured. This segmentation allows the system to manage complexity by handling different transmission scenarios separately rather than using a single complex coordination mechanism.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present application discloses a method for operating a user equipment (UE) in a wireless communication system, the method comprising: receiving, from a base station, a random access response (RAR); extracting a UL delay parameter from an uplink grant in the RAR; determining, and according to a time unit index n and the UL delay parameter, the time to transmit an Msg3 in the random access process of the UE; and transmitting the Msg3 according to the determined transmission time, wherein the n is a time unit index of the RAR or a time unit index indicating a downlink control channel of the RAR. With the present application, it is beneficial to improve the transmission performance of the system.