Unlicensed Band Channel Access Priority Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE-A systems, user equipment (UE) faces challenges in performing transmissions in unlicensed bands due to uncertainty and unavailability of resources, as resources in the unlicensed band may be occupied, leading to irregular operation.
Innovation Solution
A communication device and method that perform channel access procedures based on different priority classes for transmissions in unlicensed bands, including random access, hybrid automatic repeat request feedback, scheduling requests, channel quality indicators, and sounding reference signals, to manage resource availability and ensure successful transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If UE performs transmission in unlicensed band without channel access procedure, then transmission speed is improved, but reliability deteriorates due to resource unavailability
Solution Approach 1:
The channel access procedure is performed before the actual transmission to check if the channel is available. This preliminary action (sensing and accessing the channel) ensures that the UE only transmits when the channel is free, thereby maintaining high transmission speed while ensuring reliable transmission by avoiding collisions with other users of the unlicensed spectrum.
2Reliability
If UE performs channel access procedure for every transmission, then reliability is improved, but time consumption increases
Solution Approach 1:
The channel access procedure is performed periodically at specific intervals before transmissions. This periodic sensing approach balances reliability (by regularly checking channel availability) with time efficiency (by not continuously monitoring but at structured intervals), reducing unnecessary time consumption while maintaining transmission reliability in the unlicensed band.
3Adaptability or versatility
If multiple priority classes are used for channel access, then adaptability is improved, but device complexity increases
Solution Approach 1:
Different priority classes (first priority class and second priority class) are assigned to different types of transmissions or channel conditions. This local differentiation allows the UE to adapt its channel access behavior to the specific requirements of each transmission type, improving overall system adaptability while keeping the complexity manageable through a simple two-class structure rather than numerous complex categories.
Data Source
AI summary
A communication device for handling a transmission comprises a storage unit for storing instructions and a processing circuit coupled to the storage unit. The processing circuit is configured to execute the instructions stored in the storage unit. The instructions comprise performing a first channel access procedure according to a first channel access priority class for a first transmission on a channel of an unlicensed band with a network, wherein the first transmission comprises at least one of a random access (RA) preamble, a hybrid automatic repeat request (HARQ) feedback, a scheduling request (SR), a channel quality indicator (CQI) and a sounding reference signal (SRS).