Does hybrid access control have much advantage over open and closed access that operators are implementing in practical networks? Most of the hybrid access methods suggest to encourage FAP owners by bonus tariffs or something like that. What’s the real scenario in practical deployment? Is there any further possible research going on hybrid control method (for interference mitigation)?
These definitions are just to classify things in academia. In industry, it depends on place/owner. As far as I know, there is no such incentive scheme applied so far.
In home femtos, only owner selected users are allowed (same as you use password for connecting to femto). femto/picos places in metro/shopping malls are mostly hybrid (as we defined in literature). It allows authorised users to connect.
regarding the research, there are still lot to do in managing interference. For example think of an scenario of large office building where you have few (let's say 4/5) femtocell access points. you can try to implement hybrid control for optimising different objective functions. Now you can implement user association rule for ensuring 1) Rate Fairness 2) Load balancing 3) Sum Rate Maximisation 4) Energy efficiency and 5) a combined objective function that takes all of the above into considerations.
Another simple task you can try to start with is: For a given set of resources and FAPs, allocate users to ensure minimum interference. Also when new users comes in the system, you can apply the same rule and compare with max rate system.
There are numerous ideas that can be explored.
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