The evolved Multimedia Broadcast Multicast Service (eMBMS) using the Multicast Broadcast Single Frequency Network (MBSFN) technique was designed for having multimedia streaming services using the multicast/broadcast way over the cellular network. Since (1) the unit of resource allocation in eMBMS-MBSFN is a subframe, (2) the code rate of an eMBMS-MBSFN session is based on the lowest Modulation and Coding Scheme (MCS) among involved User Equipments (UEs) of the eMBMS-MBSFN session and (3) the resource allocation for eMBMS-MBSFN cannot be so instantly and dynamically adjusted based on the status of involved UEs, triggering eMBMS-MBSFN in the inappropriate time and allocating inappropriate resource to eMBMS, for which a framework of how to set the configuration of the allocated resource for eMBMS-MBSFN has been defined in the standard, may cause (1) the radio resources to be wasted and (2) the low streaming quality and code rate. Based on the MBMS operation on Demand (MooD) concept, this work proposed the Incremental Allocation of Radio Resource between Unicast and Multicast (IARR-UM) method to dynamically allocate radio resources to eMBMS based on the current Radio Access Network’s (RAN’s) congestion situation such that some suitable multimedia streaming services are switched to eMBMS and others still use unicast communication. To effectively use eMBMS to mitigate RAN’s congestion, the proposed IARR-UM method (1) dynamically increases/decreases the amount of radio resources allocated to eMBMS, i.e., modifying the configuration of the allocated resource for eMBMS-MBSFN using the standard’s framework, based on the situation of RAN’s congestion, (2) uses the Knapsack algorithm to select a subset of suitable multimedia streaming services to be eMBMS sessions according to the given amount of radio resources allocated to eMBMS, and then (3) design a Common Subframe Allocation (CSA) pattern that can have the lower amount of redundant radio resources allocated to eMBMS. The results of the performance evaluation shown that the proposed method can (1) provide UEs with appropriate radio resources and (2), although the throughput may be reduced in some cases, effectively reduce (increase) the UEs’ invalid packet rates (data rates), especially in the higher density of UEs’ situation.

使用多播广播单频网络（MBSFN）技术开发的演进的多播广播多播服务（eMBMS）被设计为通过蜂窝网络上的多播/广播方式使用多媒体流服务。由于（1）eMBMS-MBSFN中的资源分配单位是子帧，（2）eMBMS-MBSFN会话的编码率是基于其所涉及的用户设备（UE）中最低的调制和编码方案（MCS）。 eMBMS-MBSFN会话和（3）无法根据涉及的UE的状态立即动态地调整eMBMS-MBSFN的资源分配，无法在不适当的时间触发eMBMS-MBSFN并向eMBMS分配不适当的资源，为此，该标准中定义了如何为eMBMS-MBSFN设置分配的资源的配置，可能导致（1）浪费无线电资源，以及（2）低流质量和低码率。基于MBMS按需操作（MooD）的概念，这项工作提出了单播和多播之间无线资源的增量分配（IARR-UM）方法，以便根据当前无线接入网络（RAN）的拥塞情况将无线资源动态分配给eMBMS。因此某些合适的多媒体流服务已切换到eMBMS，而另一些仍使用单播通信。为了有效地使用eMBMS来缓解RAN的拥塞，建议的IARR-UM方法（1）动态地增加/减少分配给eMBMS的无线电资源的数量，即，使用标准框架修改为eMBMS-MBSFN分配的资源的配置，在RAN拥塞的情况下，（2）使用Knapsack算法，根据分配给eMBMS的给定无线电资源量，选择适合的多媒体流服务的子集作为eMBMS会话，然后（3）设计可以具有以下特征的通用子帧分配（CSA）模式：分配给eMBMS的冗余无线资源数量更少。性能评估的结果表明，所提出的方法可以（1）为UE提供适当的无线电资源，并且（2）尽管在某些情况下可以降低吞吐量，但可以有效地降低（增加）UE的无效数据包速率（数据速率） ），尤其是在UE密度较高的情况下。然后（3）设计一个公共子帧分配（CSA）模式，该模式可以分配给eMBMS的冗余无线资源数量较少。性能评估的结果表明，所提出的方法可以（1）为UE提供适当的无线电资源，并且（2）尽管在某些情况下可以降低吞吐量，但可以有效地降低（增加）UE的无效数据包速率（数据速率） ），尤其是在UE密度较高的情况下。然后（3）设计一个公共子帧分配（CSA）模式，该模式可以分配给eMBMS的冗余无线资源数量较少。性能评估的结果表明，所提出的方法可以（1）为UE提供适当的无线电资源，并且（2）尽管在某些情况下可以降低吞吐量，但可以有效地降低（增加）UE的无效数据包速率（数据速率） ），尤其是在UE密度较高的情况下。