Autonomous Uplink Time Slot Selection for Interference Avoidance
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Solution Overview
Problem
In wireless communication systems, particularly in LTE systems, the sharing of Autonomous Uplink (AUL) resources among multiple User Equipments (UEs) leads to interference and unfairness in channel occupancy, as a UE that occupies a channel first may prevent subsequent UEs from accessing it, resulting in inefficient resource utilization and potential latency.
Innovation Solution
The method involves allowing UEs to determine their transmitting start times autonomously within a time window, where multiple candidate time-positions are dynamically adjusted based on the time domain position of the window, ensuring each UE has a unique start time and reducing interference by allowing UEs to select their time slot from multiple available slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs share the same AUL resource to improve resource utilization, then resource utilization is improved, but interference between UEs occurs and channel occupancy fairness deteriorates
Solution Approach 1:
The time window is segmented into multiple candidate time positions, and different UEs are assigned to different segments (time positions) within the window. This segmentation allows multiple UEs to share the AUL resource while avoiding interference by ensuring they transmit at different times.
Solution Approach 2:
The candidate time positions within the time window are dynamically configured based on the time domain position of the window. This dynamic adjustment ensures that as the window position changes, the candidate time positions adapt accordingly, maintaining fair channel occupancy opportunities for different UEs across varying time conditions.
2Speed
If a UE occupies the channel in advance to reduce latency, then transmission speed is improved, but subsequent UEs are blocked and channel occupancy fairness deteriorates
Solution Approach 1:
Candidate time positions are predetermined within the time window based on the window's time domain position. This preliminary configuration of multiple candidate positions allows UEs to select appropriate transmission times in advance, reducing latency while ensuring fair access opportunities for multiple UEs through the predefined candidate positions.
Data Source
AI summary
The disclosure provides a method and a device in a User Equipment (UE) and a base station for wireless communication. The UE receives first information, listens in a first frequency subband, and transmits a first radio signal in the first frequency subband starting from a first time-position. The first time-position is in a first time window, and the act of listening is used for determining the first time-position; the first time-position is one of L candidate time-position(s) in the first time window; the first information and a time domain position of the first time window are used together for determining at least one of the L and the L candidate time-position(s) in the first time window; and the L is a positive integer. The disclosure improves the utilization of radio resources in Autonomous UpLink (AUL) transmission, avoids interferences between UEs, and guarantees the fairness of channel occupancy between different UEs.