Admission control in 5G networks for the coexistence of eMBB-URLLC users
1University of Oulu, Faculty of Information Technology and Electrical Engineering, Communications Engineering
|Online Access:||PDF Full Text (PDF, 0.5 MB)|
|Persistent link:|| http://urn.fi/URN:NBN:fi:oulu-201910223007
Oulu : N. Ginige,
|Publish Date:|| 2019-10-28
|Thesis type:||Master's thesis (tech)
Kapuruhamy Badalge, Shashika
In this thesis, we have considered the problem of admission control in 5G networks where enhanced mobile broadband (eMBB) users and ultra-reliable low-latency communication (URLLC) users coexist. Our aim is to maximize the number of admitted eMBB users to the system with a guaranteed data rate, while allocating power, bandwidth and beamforming directions to all URLLC users whose latency and reliability requirements are always guaranteed.
We have considered the downlink of a multiple-input single-output (MISO) network. We have considered orthogonal spectrum sharing between these two types of users. The maximum achievable data rate by an eMBB user is modelled using the Shannon equation. As the packet length of an URLLC user is small, to model the data rate of an URLLC user, we have used the approximation of Shannon’s rate in short blocklength regime. Then, to further simplify and to obtain a lower bound for the short blocklength capacity equation, we have used the notion of effective bandwidth. This admission control problem is formulated as an l0 minimization problem. It is an NP-hard problem. We have used sequential convex programming to find a suboptimal solution to the problem.
Numerically we have shown the convergence of the algorithm. With numerical results, we have shown that number of admitted users increases with the increase of the total bandwidth of the system and maximum power of the base station. Further, it decreases with the increase of the target rate for eMBB users. Moreover, we have proven with the help of numerical results that the number of admitted users is decreasing with the increase of number of URLLC users in the system.
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