Robust LTE uplink scheduling based on call admission control

Abstract

In LTE system, it is difficult for an eNB to properly allocate uplink resource blocks (RBs) to UEs as many factors complicate the issue. So far, most research has focused on maximizing system throughput. However, this is often achieved by downgrading other performance metrics and may result in the waste of resources. In this paper, a resource allocation scheme for LTE uplink is proposed which takes into account the data rate granted by call admission control (CAC). Data rate is defined based on exponentially weighted moving average (EWMA). The scheme leads to a close match between user demand and resources actually allocated, thereby making better use of the resources. In addition, robust modulation-coding is considered in resource allocation. Results obtained via simulation show that the proposed scheme demonstrates good performance in important aspects compared to other resource allocation methods.

Differentiating and Scheduling LTE Uplink Traffic Based on Exponentially Weighted Moving Average of Data Rate

“…AAG scheme follows the constraint in which RBs allocated to a UE must be contiguous and must use the lowest available modulation-coding scheme (MCS). Simulation results have shown that AAG provides shorter packet delays and higher system throughput and UE satisfaction than those achieved using the RME and RR schemes under the scenarios simulated in [16].…”

“…We have demonstrated the excellent performance of AAG in [16] and the functionality of AAG-2 in Section 5. In the following, we demonstrate the functionality of AAG-D in an Table 3 environment that differs somewhat from that used in Section 5.…”

“…The larger the burst is, the larger the instant EWMA value is. Thus, B m grant in (6) In [15,16], the functionality of AAG was verified in an environment with random channel quality. In this study, our aim is to focus our attention on the means by which system capacity is shared among GBR and non-GBR traffic in AAG-2.…”

“…AAG-2 builds on AAG, as presented in [15,16]. For the sake of completeness, we briefly describe the operation of the original AAG in the following.…”

Scheduling Both GBR and Non-GBR Uplink Bearers Based on Moving Average of Data Rate

“…In section IV we will present a novel scheme AAG-2 that not only ensures QoS for GBR bearers but also offers a certain level of service for non-GBR bearers at the same time. AAG-2 builds on AAG which was presented in [14,15]. For sake of completeness, we briefly describe the operation of AAG in the follows.…”