Grant-Free Uplink Time Window Segmentation for Collision Control
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Solution Overview
Problem
In Grant-Free uplink transmissions, unsynchronized uplink transmissions between User Equipments (UEs) in Radio Resource Control (RRC) Inactive or Idle Mode lead to collisions, necessitating a new structure for uplink bursts to ensure transmission success, particularly in scenarios where Grant-Free and Grant-based transmissions coexist.
Innovation Solution
A method involving the transmission of first and second radio signals within specific time windows, where the second time window's position and duration are determined relative to a target time window, allowing network equipment to control collisions and optimize resource utilization through scheduling, using air interface communications to manage frequency-domain, code-domain, and time-domain resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Grant-Free uplink transmissions are used without synchronization, then transmission flexibility is improved, but collision between transmissions increases
Solution Approach 1:
The patent segments the uplink transmission structure by introducing distinct time windows: a first time window for Grant-Free transmissions and a second time window for Grant-based transmissions. This segmentation separates previously overlapping transmission opportunities, allowing UEs to transmit without strict synchronization while preventing collisions through structured temporal division.
Solution Approach 2:
The patent implements dynamic time window configuration where the network can flexibly adjust the positions and durations of first and second time windows based on traffic conditions. This dynamic structure maintains transmission flexibility for Grant-Free mode while adaptively preventing collisions when Grant-based transmissions are active.
2Reliability
If a new uplink burst structure is designed to reduce collisions, then transmission success rate is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring time window structures and collision avoidance rules before transmissions occur. The network provides configuration information defining first and second time windows, enabling UEs to autonomously select appropriate transmission opportunities without complex real-time collision detection or negotiation, thereby improving reliability while limiting complexity growth.
3Productivity
If time windows are configured to avoid collision, then resource utilization efficiency is improved, but scheduling flexibility is reduced
Solution Approach 1:
The patent employs dynamic time window configuration where the network can adjust the positions, durations, and frequencies of first and second time windows based on real-time traffic conditions. This dynamic approach improves resource utilization by concentrating transmissions in efficient time slots while maintaining scheduling flexibility through adaptive reconfiguration, preventing the system from becoming rigid.
Solution Approach 2:
The patent creates a universal time window framework that serves multiple functions: it enables both Grant-Free and Grant-based transmissions, supports collision avoidance, and provides scheduling flexibility. The same time window structure adapts to different traffic conditions and transmission types, improving overall resource utilization without sacrificing versatility.
Data Source
AI summary
A method and a device in a communication node used for wireless communications is disclosed in the present disclosure. The communication node first receives first information and second information; and transmits a first radio signal in a first time window; and then transmits a second radio signal; the first information is used to determine a target time window, the second radio signal occupies a second time window in time domain, and the second information is used to determine at least one of whether the second time window belongs to the target time window or a relative position relationship between the second time window and the target time window; an end of the first time window is earlier than a start of the target time window. The present disclosure helps improve the utilization ratio of resources in Grant-Free transmission.