Relay technology has been included in long term evolution (LTE) cellular system through 3GPP Release 10. Relay-based LTE cellular system is one of the most promising technologies to enhance the throughput and coverage of access network. Deployment of relays in a cell opens many issues of frequency/time domain radio resource allocation and frequency planning. In this study, the authors consider the uplink of LTE relay-assisted network and formulate the joint scheduling and intra-cell interference mitigation as a non-linear optimisation problem. They take into account the projection of the gradient of user's utility function over the user's rate vector based on Lagrangian method. They propose a novel transformation of scheduling problem into combinatorial Knapsack optimisation to convert the optimisation problem into binary integer non-linear program. Finally, they present an alternate solution through a low complexity algorithm to allocate resources based on group of resource blocks, whereas considering the contiguity constraint. Simulation results show that the proposed scheme is near optimal with a much lower complexity order.

References

1. 1)
  - 27. Lee, S., Pefkianakis, I., Meyerson, A., Xu, S., Lu, S.: ‘Proportional fair frequency-domain packet scheduling for 3GPP LTE uplink’. Proc. IEEE INFOCOM, Rio de Janeiro, 2009, vol. 1, pp. 2611–2615.
2. 2)
  - 1. Requirements for further advancements for Evolved Universal Terrestrial Radio Access (E-UTRA) LTE-Advanced (Release 10)’, 3GPP Std. 3GPP TS 36.913, Rev. 10.0.0, 2011–13.
3. 3)
  - W. Yu , R. Lui . Dual methods for nonconvex spectrum optimization of multicarrier systems. IEEE Trans. Commun. , 7 , 1310 - 1322
4. 4)
  - 17. Evolved Universal Terrestrial Radio Access (EUTRA): ‘Physical Layer Procedures (Release 8)’, 3GPP Std. 3GPP TS 36.213, Rev. 8.5.0, 2008.
5. 5)
  - 21. Alam, M.S., Mark, J.W., Shen, X.S.: ‘Relay selection and resource allocation for multi-user cooperative OFDMA networks’, IEEE Trans. Wirel. Commun., 2013, 12, (5), pp. 2193–2205 (doi: 10.1109/TWC.2013.032113.120652).
6. 6)
  - 11. Schoenen, R., Zirwas, W., Walke, B.H.: ‘Capacity and coverage analysis of a 3GPP-LTE multihop deployment scenario’. IEEE Int. Conf. on Communications Workshops, 2008 (ICC Workshops ’08), Beijing, China, 2008, pp. 31–36.
7. 7)
  - 31. Evolved Universal Terrestrial Radio Access (EUTRA): ‘User Equipment (UE) radio transmission and reception (Release 10)’, 3GPP Std. 3GPP TS 36.101, Rev. 10.4.0, 2011.
8. 8)
  - 32. Dimitris, B., Weismantel, R.: ‘Opimization over integers’ (Dynamic Ideas, Belmont, MA, 2005).
9. 9)
  - 19. Ren, Z., Saleh, A., Bulakci, O., Redana, S., Raaf, B., Hamalainen, J.: ‘Joint interference coordination and relay cell expansion in LTE-Advanced networks’. 2012 IEEE Wireless Communications and Networking Conf. (WCNC), Shanghai, 2012, pp. 2874–2878.
10. 10)
  - D.P. Palomar , M. Chiang . A tutorial on decomposition methods for network utility maximization. IEEE J. Sel. Areas Commun. , 8 , 1439 - 1451
11. 11)
  - 15. Bulakci, O., Bou Saleh, A., Redana, S., Raaf, B., Hmlinen, J.: ‘Resource sharing in LTE-advanced relay networks: uplink system performance analysis’, Trans. Emerging Telecommun. Technol., 2013, 24, (1), pp. 32–48. Available at: (doi: 10.1002/ett.2569).
12. 12)
  - 24. Goldsmith, A.: ‘Wireless communications’ (Oxford University Press, UK, 2005).
13. 13)
  - 16. Yaacoub, E., Dawy, Z.: ‘Uplink scheduling in LTE systems using distributed base stations’, Eur. Trans. Telecommun., 2010, 21, (6), pp. 532–543. Available at: (doi: 10.1002/ett.1408).
14. 14)
  - 33. Salem, M., Adinoyi, A., Yanikomeroglu, H., Falconer, D.: ‘Opportunities and challenges in OFDMA-based cellular relay networks: a radio resource management perspective’, IEEE Trans. Veh. Technol., 2010, 59, (5), pp. 2496–2510 (doi: 10.1109/TVT.2010.2042736).
15. 15)
  - 5. Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Further advancements for E-UTRA physical layer aspects (Release 9)’, 3GPP Std. 3GPP TR 36.814 V9.0.0, 2010, 15, (4), pp. 1642–1670.
16. 16)
  - 13. Hong, W., Han, J., Wang, H.: ‘Full uplink performance evaluation of FDD/TDD LTE-advanced networks with type-1 relays’. IEEE Vehicular Technology Conf. (VTC Fall 2011), San Francisco, CA, September 2011, pp. 1–5.
17. 17)
  - 26. Madan, R., Boyd, S.P., Lall, S.: ‘Fast algorithms for resource allocation in wireless cellular networks’, IEEE/ACM Trans. Netw., 2010, 18, (3), pp. 973–984 (doi: 10.1109/TNET.2009.2034850).
18. 18)
  - 9. Akyildiz, I.F., Estévez, D.M.G., Reyes, E.C.: ‘The evolution to 4G cellular systems: LTE-advanced’, Phys. Commun., 2010, 3, (4), pp. 217–244 (doi: 10.1016/j.phycom.2010.08.001).
19. 19)
  - 22. Lim, J., Myung, H., Oh, K., Goodman, D.: ‘Channel dependent scheduling of uplink single carrier FDMA systems’. Proc. IEEE VTC'06 Fall, Montreal, Que., October 2006, vol. 1, pp. 1–5.
20. 20)
  - 6. Oyman, O.: ‘Opportunistic scheduling and spectrum reuse in relay-based cellular networks’, IEEE Trans. Wirel. Commun., 2010, 9, (3), pp. 1074–1085 (doi: 10.1109/TWC.2010.03.081306).
21. 21)
  - 36. Salem, M., Adinoyi, A., Rahman, M., et al: ‘An overview of radio resource management in relay-enhanced OFDMA-based networks’, IEEE Commun. Surv. Tutor., 2010, 12, (3), pp. 422–438 (doi: 10.1109/SURV.2010.032210.00071).
22. 22)
  - 34. Zheng, K., Fan, B., Liu, J., Lin, Y., Wang, W.: ‘Interference coordination for OFDM-based multihop LTE-advanced networks’, IEEE Wirel. Commun., 2011, 18, (1), pp. 54–63 (doi: 10.1109/MWC.2011.5714026).
23. 23)
  - C.Y. Wong , R.S. Cheng , K.B. Letaief , R.D. Murch . Multiuser OFDM with adaptive subcarrier, bit, and power allocation. IEEE J. Sel. Areas Commun. , 10 , 1747 - 1758
24. 24)
  - 3. Hamza, A., Khalifa, S., Hamza, H., Elsayed, K.: ‘A survey on inter-cell interference coordination techniques in OFDMA-based cellular networks’, IEEE Commun. Surv. Tutor., 2013, (99), pp. 1–29.
25. 25)
  - 4. Bhat, P., Nagata, S., Campoy, L., et al: ‘LTE-advanced: an operator perspective’, IEEE Commun. Mag., 2012, 50, (2), pp. 104–114 (doi: 10.1109/MCOM.2012.6146489).
26. 26)
  - 9. Beniero, T., Redana, S., Hamalainen, J., Raaf, B.: ‘Effect of relaying on coverage in 3GPP LTE-advanced’. IEEE 69th Vehicular Technology Conf., 2009 (VTC Spring 2009), Barcelona, Spain, 2009, pp. 1–5.
27. 27)
  - 25. Subramanian, V.G., Berry, R.A., Agrawal, R.: ‘Joint scheduling and resource allocation in CDMA systems’, IEEE Trans. Inf. Theory, 2010, 56, (5), pp. 2416–2432 (doi: 10.1109/TIT.2010.2040860).
28. 28)
  - 21. Venkatasubramanian, V., Haustein, T.: ‘A novel scheduling framework for QoS-aware OFDMA resource allocation in a network with small relay cells and macro users’, EURASIP J. Wirel. Commun. Netw., 2012, 2012, pp. 309, [http: //dblp.uni-trier.de/db/journals/ejwcn/ejwcn2012.html] (doi: 10.1186/1687-1499-2012-309).
29. 29)
  - 14. Evolved Universal Terrestrial Radio Access (EUTRA): ‘Relay architectures for E-UTRA LTE-Advanced (Release 9)’, 3GPP Std. 3GPP TR 36.806, Rev. 9.0.0, 2010.
30. 30)
  - 17. Salem, M., Adinoyi, A., Rahman, M., Yanikomeroglu, H., Falconer, D., Kim, Y.D.: ‘Fairness-aware radio resource management in downlink OFDMA cellular relay networks’, IEEE Trans. Wirel. Commun., 2010, 9, (5), pp. 1628–1639 (doi: 10.1109/TWC.2010.05.081548).
31. 31)
  - 18. Li, W.-Y., Zhang, X., Jia, S.-C., et al: ‘A novel dynamic adjusting algorithm for load balancing and handover co-optimization in LTE SON’, J. Comput. Sci. Technol., 2013, 28, (3), pp. 437444. Available at: (doi: 10.1007/s11390-013-1345-1).
32. 32)
  - 23. ‘Additional RSRP reporting trigger for ICIC’, Ericsson, Sevilla Spain, 3GPP TSG RAN WG1 Meeting 51b, R1-080361, January 2008.
33. 33)
  - 8. Timus, B., Soldati, P., Zander, J.: ‘Implications of fairness criteria on the techno-economic viability of relaying networks’. IEEE 69th Vehicular Technology Conf., 2009 (VTC Spring 2009), Barcelona, Spain, 2009, pp. 1–5.
34. 34)
  - 2. Yaacoub, E., Dawy, Z.: ‘Joint uplink scheduling and interference mitigation in multicell LTE networks’. 2011 IEEE Int. Conf. on Communications (ICC), Kyoto, 2011, pp. 1–5.
35. 35)
  - 35. Holma, H., Toskala, A.: ‘WCDMA for UMTS: HSPA Evolution and LTE’ (John Wiley & Sons, 2010).
36. 36)
  - 10. Venkatkumar, V., Wirth, T., Haustein, T., Schulz, E.: ‘Relaying in long term evolution: indoor full frequency reuse’. Wireless Conf., 2009 (EW 2009), European, Aalborg, Denmark, 2009, pp. 298–302.

Hybrid radio resource allocation and interference coordination for type 1a-relayed long term evolution uplink

References

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