LAA Base Station DCI Segmentation for Multi-Subframe Scheduling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In mobile communication systems, particularly in LAA (Licensed-Assisted Access) technology, there is a challenge in transmitting downlink control information (DCI) for multi-subframe scheduling due to the limited bit length of DCI, which affects error resilience and interference avoidance in shared frequency bands.
Innovation Solution
A base station divides the DCI for multi-subframe scheduling and transmits it within one subframe, allowing the radio terminal to receive and process the information efficiently, while also implementing listen-before-talk (LBT) procedures to avoid interference in shared frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DCI for multi-subframe scheduling is transmitted with longer bit length, then scheduling capability is improved, but error resilience deteriorates due to limited DCI bit length
Solution Approach 1:
The DCI for multi-subframe scheduling is divided into multiple parts or segments, each transmitted separately within the limited bit length constraint. This segmentation allows the system to convey comprehensive scheduling information across multiple transmissions while maintaining error resilience through redundancy and acknowledgment mechanisms.
2Productivity
If DCI bit length is limited, then transmission efficiency is improved, but information completeness deteriorates for multi-subframe scheduling
Solution Approach 1:
The system transmits DCI for the first subframe in advance, allowing the radio terminal to prepare for reception. Subsequent DCI transmissions for additional subframes build upon this preliminary information, ensuring complete scheduling information is conveyed efficiently across multiple transmissions without overwhelming the initial transmission capacity.
3Productivity
If base station transmits downlink signal in shared frequency band, then resource utilization is improved, but interference to other operators deteriorates
Solution Approach 1:
The base station performs listen-before-talk (LBT) procedure before transmitting downlink signals in the shared unlicensed frequency band. This preliminary detection of channel occupancy prevents transmission when other operators or systems are actively using the band, thereby avoiding interference while maximizing resource utilization when the band is available.
Data Source
AI summary
A communication method according to one embodiment comprises: transmitting, by a base station that manages a Licensed-Assisted Access (LAA) cell, downlink control information (DCI) to a user equipment, the DCI including subframe information and a transmission instruction of a sounding reference signal in the LAA cell, the subframe information indicates a specific subframe in which the user equipment should transmit the sounding reference signal; and transmitting, by the user equipment, the sounding reference signal to the base station in the specific subframe, based on the DCI.