In a conventional cellular network, the base station manages the admission control policy. In other words, if a user wishes to establish a new call and the radio resources are not available in its home BS, he or she will be automatically bl. In a conventional cellular network, the base station manages the admission control policy. In other words, if a user wishes to establish a new call and the radio resources are not available in its home BS, he or she will be automatically blocked. In the relaying context, the admission control should be coordinated between the BS and its subordinate. In the LTE network, the radio resources are composed of physical resource blocks (PRB), which have both a time and frequency dimension. Thus, different users share the PRBs that can be assigned by the BS scheduler. In addition, in the presence of an RS, the radio resources at each station (BS and RSs) are shared between the direct, backhaul, and th. The design of traditional cellular networks tends to maximize capacity and coverage, which can potentially lead to solutions where energy efficiency drops. In relaying networks, energy efficiency can be seen from two viewpoints. On the operator side, the energy spent by the infrastructure may increase by increasing the number of relay stations, imp. The relay selection process specifies the user assignment scheme to the different stations that are available in the network. Usually in conventional cellular networks, the UE selects one of the base stations available based on the channel condition, such that the user will achieve a high level of throughput. In the relaying context, however, the r. The handoff mechanism plays a critical role in the mobility management protocol design. In conventional cellular networks, the user only has the option to execute a handoff between BSs. In the relaying context, on the other hand, the handoff algorithm might be more complex, and could require the use of more coordination and cooperation mechanisms t.