Multicasting is an effective method of transmitting the group messages that results in minimal utilization of network resources. But in real scenario, both unicast and multicast services are to be served by the evolved Node B (eNB). So an appropriate resource allocation method should be adopted to satisfy the Quality of Service (QoS) requirements of these services. This paper focuses on resource allocation method for Long Term Evolution (LTE) downlink when these services are scheduled by the eNB. To improve the system throughput, an objective function is formulated that maximizes the throughput of both unicast and multicast services. The multicast group is in turn divided into subgroups and the subgrouping allocation is carried out by means of Genetic Algorithm (GA) that aims to maximize the total throughput. It is shown that multicast with subgrouping shows 20% increase in the total throughput and 3% reduction in average delay when compared with combined unicast and conventional multicasting method that uses Least Channel Gain (LCG) user rate for multicast transmission.
3GPP, TS 36.300, Evolved Universal Terrestrial Radio Access (EUTRA) and Evolved Universal Terrestrial Radio Access Network (EUTRAN), Rel. 11, Sep. 2012.
2.
3GPP, Tech. Specific. Group Radio Access Network – Physical Channel and Modulation (Release 8), 3GPP TS 36.211.
3.
R.O.Afolabi, A.Dadlani and K.Kim, Multicast scheduling and resource allocation algorithms for OFDMA based systems: A survey, IEEE Communications Surveys and Tutorials15(1) (2013), 240–254. doi:10.1109/SURV.2012.013012.00074.
4.
S.M.Alavi, C.Zhou and W.W.Gen, Efficient resource allocation algorithm for OFDMA systems with delay constraint, Computer Communications36(4) (2013), 421–430. doi:10.1016/j.comcom.2012.11.004.
5.
G.Araniti, M.Condoluci, M.Cotronei, A.Iera and A.Molinaro, A solution to the multicast subgroup formation problem in LTE systems, IEEE Wireless Communications Letters4(2) (2015), 149–152. doi:10.1109/LWC.2014.2387824.
6.
G.Araniti, M.Condoluci, L.Militano and A.Iera, Adaptive resource allocation to multicast services in LTE systems, IEEE Transactions on Broadcasting59(4) (2013), 658–664. doi:10.1109/TBC.2013.2271387.
7.
G.Araniti, M.Condoluci, A.Orisino, A.Iera, A.Molinaro and J.Cosmas, Evaluating the performance of multicast resource allocation policies over LTE systems, in: IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, 2015, pp. 1–6.
8.
K.Bakanoglu, W.Mingquan, L.Hang and M.Saurabh, Adaptive resource allocation in multicast OFDMA systems, in: IEEE Wireless Communications and Networking Conference, 2010, pp. 1–6.
9.
F.A.Bokhari, H.Yanikomeroglu, W.K.Wong and M.Rahman, Cross-layer resource scheduling for video traffic in the downlink of OFDMA-based wireless 4G networks, in: EURASIP Journal on Wireless Communications and Networking, 2009, pp. 1–10.
10.
M.Brehm and R.Prakash, Overload-state downlink resource allocation in LTE MAC layer, Wireless Networks19(5) (2013), 913–931. doi:10.1007/s11276-012-0509-1.
11.
J.G.Choi and S.Bahk, Cell-throughput analysis of the proportional fair scheduler in the single-cell environment, IEEE Transactions on Vehicular Technology56(2) (2007), 766–778. doi:10.1109/TVT.2006.889570.
12.
S.Fouziya Sulthana and R.Nakkeeran, Study of downlink scheduling algorithms in LTE networks, Journal of Networks9(12) (2014), 3381–3391.
13.
S.Fouziya Sulthana and R.Nakkeeran, Performance analysis of service based scheduler in LTE OFDMA system, Wireless Personal Communications83(2) (2015), 841–854. doi:10.1007/s11277-015-2429-8.
14.
S.Fouziya Sulthana and R.Nakkeeran, Performance evaluation of downlink packet scheduling for real time traffic in LTE system, International Journal of Information and Communication Technology10(3) (2017), 263–275. doi:10.1504/IJICT.2017.083261.
15.
I.G.Fraimis and S.A.Kotsopoulos, Queue-aware resource allocation for multi-cell OFDMA system with QoS provisioning, Wireless Personal Communications71(4) (2013), 3033–3044. doi:10.1007/s11277-012-0988-5.
16.
M.Iturralde, T.Ali Yahiya, A.Wei and A.-L.Beylot, Performance study of multimedia services using virtual token mechanism for resource allocation in LTE networks, in: IEEE Vehicular Technology Conference, 2011, pp. 1–5.
17.
J.Y.Kim, T.Kwon and D.H.Cho, Resource allocation scheme for minimizing power consumption in OFDM multicast systems, IEEE Communications Letters11(6) (2007), 486–488. doi:10.1109/LCOMM.2007.070007.
18.
H.Kwon and B.G.Lee, Cooperative power allocation for broadcast/multicast services in cellular OFDM systems, IEEE Transactions on Communications57(10) (2009), 3092–3102. doi:10.1109/TCOMM.2009.10.080196.
19.
W.K.Lai and C.-L.Tang, QoS-aware downlink packet scheduling for LTE networks, Computer Networks57(7) (2013), 1689–1698. doi:10.1016/j.comnet.2013.02.017.
20.
Z.Liet al., Optimization of coverage and throughput in single cell eMBMS, in: IEEE Vehicular Technology Conference, 2009, pp. 1–5.
21.
J.Liu, W.Chen and K.B.Letaief, Dynamic power and subcarrier allocation for OFDMA based wireless multicast systems, in: IEEE International Conference on Communications, 2008, pp. 2607–2611.
22.
T.P.Low, M.O.Pun, Y.W.P.Hong and C.C.J.Kuo, Optimized opportunistic multicast scheduling over wireless cellular networks, IEEE Transactions on Wireless Communications9(2) (2010), 791–801. doi:10.1109/TWC.2010.02.090387.
23.
D.T.Ngo, C.Tellambura and H.H.Hguyen, Efficient resource allocation for OFDMA multicast systems with spectrum sharing control, IEEE Transactions on Vehicular Technology58(9) (2009), 4878–4889. doi:10.1109/TVT.2009.2027331.
24.
E.Patouni, V.Papuotsis, L.Merakos and C.Verikoukis, Resource management in multicast OFDMA with proportional data rate and BER constraints, in: IEEE Conference on Communications, 2014, pp. 1–6.
25.
G.Piro, L.Grieco, G.Boggia, R.Fortuna and P.Camarda, Two-level downlink scheduling for real-time multimedia services in LTE networks, IEEE Transactions on Multimedia13(5) (2011), 1052–1065. doi:10.1109/TMM.2011.2152381.
26.
I.Rubin, H.-B.Chang and R.Cohen, Micro base station aided failover for multicast scheduling in wireless cellular networks, IEEE Transactions on Wireless Communications13(9) (2014), 5251–5263. doi:10.1109/TWC.2014.2334672.
27.
F.S.S.H.Shakir and N.Rangaswamy, A simple three level downlink packet scheduling to improve throughput in LTE network, IEICE Communication Express4(9) (2015), 293–298. doi:10.1587/comex.4.293.
28.
C.Suh and J.Mo, Resource allocation for multicast services in multicarrier wireless communications, IEEE Transactions on Wireless Communications7(1) (2008), 27–31. doi:10.1109/TWC.2008.060467.
29.
K.Sundaresan and S.Rangarajan, Cooperation versus multiplexing: Multicast scheduling algorithms for OFDMA relay networks, IEEE/ACM Transactions on Networking22(3) (2014), 756–769. doi:10.1109/TNET.2013.2260353.
30.
H.Won, H.Cai, D.Y.Eun, K.Guo, A.Netravali, I.Rhee and K.Sabnani, Multicast scheduling in cellular data networks, IEEE Transactions on Wireless Communications8(9) (2009), 4540–4549. doi:10.1109/TWC.2009.080330.
31.
W.Xu, K.Niu, J.Lin and Z.He, Resource allocation in multicast OFDM systems: Lower/upper bounds and suboptimal algorithm, IEEE Communications Letters15(7) (2011), 722–724. doi:10.1109/LCOMM.2011.051911.110203.
32.
H.Zhu and J.Wang, Chunk-based resource allocation in OFDMA systems-part I: Chunk allocation, IEEE Transactions on Communications57(9) (2009), 2734–2744. doi:10.1109/TCOMM.2009.09.080067.
