Uplink Transmission in Unlicensed Bands via Sub-Pool Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems using unlicensed bands, interference among various communication protocols leads to unpredictable quality of service and mobility issues due to contention-based channel access, making it difficult to guarantee communication quality and throughput.
Innovation Solution
A method for uplink transmission in unlicensed bands involves a wireless device receiving information about a main-pool from a base station, performing clear channel assessment (CCA) on multiple sub-pools within the main-pool to determine an idle sub-pool, and transmitting an uplink transport block using that sub-pool, with the option to randomly select a sub-pool for CCA, thereby mitigating interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If carrier sense multiple access with collision avoidance (CSMA/CA) is used in unlicensed band, then channel access is achieved in contention-based manner, but interference phenomenon becomes serious and quality of service cannot be guaranteed
Solution Approach 1:
The unlicensed band is divided into multiple sub-pools within a main pool, allowing wireless devices to perform clear channel assessment on individual sub-pools. This segmentation reduces collision probability by distributing access attempts across multiple smaller channels, thereby maintaining ease of operation while improving service reliability.
2Measurement precision
If clear channel assessment (CCA) is performed on the unlicensed band, then channel idle status is confirmed, but interference from various wireless access techniques cannot be eliminated
Solution Approach 1:
The unlicensed band is divided into multiple sub-pools within a main pool, allowing wireless devices to perform clear channel assessment on individual sub-pools. This segmentation reduces collision probability by distributing access attempts across multiple smaller channels, thereby maintaining ease of operation while improving service reliability.
3Productivity
If LTE service is extended to unlicensed band, then throughput is increased due to higher frequency efficiency, but mobility support and communication quality guarantee become difficult
Solution Approach 1:
The unlicensed band is divided into multiple sub-pools within a main pool, allowing wireless devices to perform clear channel assessment on individual sub-pools. This segmentation reduces collision probability by distributing access attempts across multiple smaller channels, thereby maintaining ease of operation while improving service reliability.
Solution Approach 2:
The system changes the parameter of channel access by introducing sub-pool selection mechanisms and adjusting clear channel assessment parameters. This allows LTE to operate efficiently in unlicensed bands by adapting to the shared medium characteristics, thereby maintaining high throughput while improving communication quality reliability.
4Adaptability or versatility
If multiple communication protocols co-exist in unlicensed band, then frequency utilization is improved, but interference mitigation becomes challenging
Solution Approach 1:
The unlicensed band is divided into multiple sub-pools within a main pool, allowing wireless devices to perform clear channel assessment on individual sub-pools. This segmentation reduces collision probability by distributing access attempts across multiple smaller channels, thereby maintaining ease of operation while improving service reliability.
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station provides downlink control information to guide uplink transmissions. This intermediary coordination helps manage interference from multiple protocols by scheduling and coordinating access attempts, thereby maintaining multi-protocol versatility while mitigating interference.
Data Source
AI summary
Provided are a method and a device for transmitting an uplink in an unlicensed band. The device checks for idle subpools by performing clear channel assessment (CCA) on a plurality of sub-pools in a main pool in an unlicensed band. The device transmits an uplink transmission block by using the idle sub-pools in the unlicensed band.