Cross-Layer Admission Control Policy for CDMA Beamforming Systems

Cross-Layer Connection Admission Control Policies for Packetized Systems

“…With ARQ, the packet duration, denoted by C j , is the summation of the original packet duration and the duration for at most L j retransmissions. As shown in [15], the mean duration can be expressed as 1 11 (…”

“…Although increasing L j may further improve system performance, it dramatically increases the computational complexity of the SMDP-based connection admission control policy. In [15], it has been shown that when L j exceeds a certain level, further increasing L j cannot improve the performance significantly. Therefore, there is no need to choose a large L j .…”

“…Therefore, there is no need to choose a large L j . A detailed discussion on the impact of ARQ and how to choose L j can be found in [15], in which a packet-level AC is discussed which employs an ARQ-based algorithm to reduce probability of outage. In this chapter, we have only addressed the connection admission control policy for a given L j .…”

“…This fact motivates an investigation into a connection level admission control policy for packet-switched networks with guaranteed QoS constraints at physical, connection and packet levels. In [15], the ARQ and admission control schemes are both performed at the packet level, while in this chapter, the admission control is performed at the connection level, while retransmissions are still performed at packet level, as is widely adopted in practical systems. The rest of this chapter is organized as follows: the signal model and problem formulation are presented in Sections II and III, respectively.…”

An Optimal Admission Control Policy for CDMA Multiple Antenna Systems with QoS Constraints

“…To employ the powerful error-control capability, a suboptimal packet admission control (PAC) problem is studied in [4], which includes the impact of an automatic-retransmission-request (ARQ) scheme. To the best of our knowledge, [4] is the first paper in the literature which addresses the cross-layer AC design by including ARQ schemes. However, the solution in [4] depends on an approximate power control feasibility condition (PCFC) and as a result is only a suboptimal solution.…”