LAA Network Node Multi-Channel Access via Master Carrier LBT
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Solution Overview
Problem
Current License-Assisted Access (LAA) multi-channel access procedures in wireless communication networks face limitations, with Type A being less efficient in accessing multiple carriers and Type B risking no access if the master carrier evaluation fails, restricting the ability to select the best carriers for transmission.
Innovation Solution
A network node method that simultaneously starts both Type A and Type B channel access procedures for all carriers, selecting the best procedure based on the master carrier's channel sensing results, allowing transmission on carriers that successfully accessed before the subframe boundary, thereby adapting to the best access method for increased throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If Type B channel access procedure is used with master carrier selection, then the time for evaluating slave carriers is reduced, but transmission on all carriers is blocked if master carrier evaluation fails
Solution Approach 1:
The network node performs LBT channel sensing on the master carrier in advance before the slave carriers. By evaluating the master carrier first and storing its result, the system prepares the channel access status beforehand, enabling faster decision-making for slave carrier transmission without blocking potential transmissions when master carrier access fails.
2Reliability
If Type A channel access procedure is used with separate access for each carrier, then transmission can occur on individual carriers even if others fail, but the time required to access multiple carriers increases
Solution Approach 1:
The network node performs LBT channel sensing on slave carriers in advance and stores the results. This preliminary action allows the system to have channel access information ready before transmission decisions are made, reducing the actual transmission setup time while maintaining the ability to transmit on individual carriers independently.
3Device complexity
If channel access procedure selection is made before starting the procedure, then the access method is predetermined, but the ability to select the best carriers for transmission is limited
Solution Approach 1:
The network node dynamically selects between Type A and Type B channel access procedures based on real-time channel conditions and LBT sensing results. Instead of predetermining the access method, the system adapts its behavior by evaluating which procedure will yield better transmission outcomes, optimizing carrier selection efficiency while managing complexity through conditional logic.
Data Source
AI summary
A network node (120) and method therein for performing multi-channel access procedures in a License-Assisted Access, LAA, cell in a wireless communication network are disclosed. The network node selects one carrier as a master carrier and starts a Listen Before Talk, LBT, channel sensing for all carriers at a same or different point in time. The network node further stores LBT channel sensing results for all carriers for at least the last two slot durations of a subframe and checks if the LBT channel sensing on the master carrier is successful based on its LBT channel sensing result. When the LBT channel sensing on the master carrier is successful, the network node checks the LBT channel sensing results for all other carriers, and transmits on the master carrier and the carriers where the LBT channel sensing is successful at the subframe boundary or earlier than the subframe boundary. When the subframe boundary of the master carrier is reached and the LBT channel sensing on the master carrier is not successful, the network node transmits on the carriers where the LBT channel sensing is successful at the subframe boundary or earlier than the subframe boundary.