How ENB and WIFI communicates in LAA?

Question

How can eNB in Licensed Cell communicate with LAA and UE in Unlicensed Cell, So that how can it avoid the scheduling problem?

Answer 1

Licensed Assisted Access (LAA) is one of the option to use LTE technology over unlicensed spectrum. There are various methods exist to use LTE and WiFi together. In case of LAA, eNodeB will use WiFi as another channel for carrier aggregation. Usually in carrier aggregation, channels from the licensed spectrum are aggregated to create fatter pipe of radio interface with UE to increase throughput. LAA is also another form of carrier aggregation, in which some channels would be from unlicensed bands.
Since unlicensed band can be used any other user in the proximity of LTE cell, LAA method uses dynamic channel selection (to find the least used sub-band) and Listen before talk (to avoid trampling of other uses).
To enable this technology, hardware changes are required at eNodeB and UE both side assuming eNodeB and UE both supports carrier aggregation.

Comments

Adding to harshitha answer, ENB will use WIFI band(not actual WIFI technology) as secondary channel in LAA.It uses LBT to monitor WIFI channle weather it is free or not free.If wifi channel occupied then it will be having beacon so that ENB will identify its is occupied , conclusion is ENB doesn't actually communicate to WIFI it uses above procedure to identify the WIFI existence.