ABSTRACT
Contents 9.1 Introduction ................................................................................. 332 9.2 Multimedia Broadcast/Multicast Service ........................................... 333
9.2.1 Operation .......................................................................... 333 9.2.2 Architecture ....................................................................... 334 9.2.3 Multicast Mode of MBMS .................................................. 336
9.2.3.1 Packet Delivery Process ......................................... 337 9.2.3.2 MBMS Multicast Mode Radio Bearers .................... 338
9.3 Power Control in MBMS Multicast Mode ........................................ 338 9.3.1 HS-DSCH Power Profile .................................................... 340 9.3.2 DCH Power Profile ............................................................ 341 9.3.3 FACH Power Profile ........................................................... 341
9.4 Power Saving Techniques ............................................................... 343 9.4.1 Dynamic Power Setting ....................................................... 343 9.4.2 Macro Diversity Combining ................................................ 343 9.4.3 Rate Splitting ..................................................................... 345
9.5 Existing Radio Bearer Selection Mechanisms ..................................... 346 9.5.1 MBMS Counting Mechanism (TS 25.346) ............................ 347 9.5.2 MBMS PTP/PTM Switching Algorithm (TR 25.922) ............ 348 9.5.3 Mechanism Proposed in 3GPP TSG RAN1 R1-02-1240 ........ 349
9.6 Proposed MBMS Mechanism .......................................................... 350 9.6.1 Performance Evaluation ....................................................... 352
9.6.1.1 Efficient MBMS Transport Channel Selection ......... 352 9.6.1.2 Comparison with the MBMS Counting
Mechanism .......................................................... 354 9.7 Open Issues ................................................................................... 358 9.8 Conclusion ................................................................................... 359 References .............................................................................................. 359
9.1 Introduction Indisputably, tomorrow’s mobile marketplace will be characterized by bandwidthhungry multimedia services that are already experienced in wired networks. Long-term evolution (LTE), the evolutionary successor of universal mobile telecommunication system (UMTS) and high-speed packet access (HSPA) networks, addresses this emerging trend, by shaping the future mobile broadband landscape. LTE promises a richer, more immersive environment that significantly increases peak data rates and spectral efficiency. However, the plethora of mobile multimedia services that are expected to face high penetration, poses the need for the deployment of a resource economic scheme. Multimedia broadcast/multicast service (MBMS), also called evolved MBMS (e-MBMS) in LTE terminology, constitutes an efficient way to compensate for this necessity since it allows resources’ sharing during data transmission [1, 2].
