Wireless Signal Transmission via Dynamic Clear Channel Assessment
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting and receiving control information, particularly in Carrier Aggregation-based systems, where effective channel assessment and resource allocation are challenging, especially in unlicensed bands.
Innovation Solution
A method for a UE to aggregate licensed and unlicensed band cells, performing clear channel assessment (CCA) procedures before transmitting a slotted uplink physical channel, allowing transmission in only one slot of a subframe without a reservation signal if the first CCA is successful, and after a reservation signal if the second CCA is successful, with the option for a third CCA if the second fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple CCA procedures are performed before transmission, then channel access reliability is improved, but transmission delay increases
Solution Approach 1:
The patent implements dynamic CCA procedure selection based on transmission conditions. The UE performs different numbers of CCA procedures (first, second, or third CCA) depending on whether previous CCA procedures succeeded or failed, allowing the system to adapt between reliability and delay requirements in real-time
Solution Approach 2:
The patent changes the parameter of CCA procedure count based on channel conditions and transmission history. By adjusting the number of CCA procedures performed (1, 2, or 3) according to whether previous attempts succeeded or failed, the system optimizes the balance between ensuring channel access reliability and minimizing transmission delay
2Object-affected harmful factors
If CCA procedures are performed before each transmission, then interference is reduced, but channel utilization efficiency decreases
Solution Approach 1:
The patent performs CCA procedures in advance before actual data transmission to ensure the channel is clear. By conducting clear channel assessment beforehand and only transmitting when the channel is confirmed available, the system prevents interference while optimizing channel usage
Solution Approach 2:
The UE autonomously performs CCA procedures and makes transmission decisions based on channel conditions without requiring external coordination. This self-service approach allows each UE to independently assess and utilize available channel capacity, improving overall channel utilization efficiency while maintaining interference reduction
Data Source
AI summary
The present invention relates to a wireless communication system, and specifically, to a method and a device for the method which comprises the steps of: aggregating a LCell and a UCell in order to communicate with a base station; and transmitting a slotted uplink physical channel via only one slot among a plurality of slots of a subframe #m of the UCell, wherein the transmission of the slotted uplink physical channel includes performing a first CCA procedure X-time prior to a reference time point of the first slot of the subframe #m, and if the first CCA procedure fails, performing a second CCA procedure Y-time (Y>X) prior to a reference time point of the second slot of the subframe #m.