On the Utilization of Multi-Mode User Equipment in Multi-Radio Access Technology Cellular Communication Systems

Multi-radio access technology (RAT) cellular communication systems limit connected users to utilizing a single RAT even when employing multi-mode user equipment (UE) capable of utilizing multi-RATs. Single-mode access, combined with static spectrum partitioning between co-deployed RATs and independent resource allocation for employed RATs, results in suboptimal spectrum utilization in multi-RAT systems. This paper models user access in multi-RAT systems and proposes enabling multi-mode UE to simultaneously utilize multiple RATs, using multi-RAT carrier aggregation, to improve the performance and spectrum utilization of multi-RAT systems. Several realizations of multi-mode access with varying implementation requirements are presented and discussed. Detailed system-level simulations, for a system co-deploying High Speed Packet Access (HSPA) and Long-Term Evolution (LTE), are performed to investigate the gains and limitations of different user access configurations in multi-RAT systems.

[1]  Elvino S. Sousa,et al.  Unified Radio Access Network operation for Multi-Radio Access Technology cellular systems , 2014, 2014 21st International Conference on Telecommunications (ICT).

[2]  Elvino S. Sousa,et al.  Dynamic Spectrum Management in Multi-Radio Access Technology (RAT) Cellular Systems , 2014, IEEE Wireless Communications Letters.

[3]  Elvino S. Sousa,et al.  Effect of Inter-Cell Inter-Radio Access Technology (RAT) interference on the performance of multi-RAT cellular systems , 2014, 2014 21st International Conference on Telecommunications (ICT).

[4]  Hoon Kim,et al.  A proportional fair scheduling for multicarrier transmission systems , 2004 .

[5]  Jonathan Ling,et al.  On some properties of the proportional fair scheduling policy , 2004, 2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754).