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Abstract
In order to achieve higher resource utilization, the call admission control (CAC) will allow the number of connections into the system more than the system capacity can offer. However, the fairness problem will occur when these connections are real-time services. To solve this problem, in this paper, we propose a fair scheduling algorithm named contribution-based scheduling algorithm (CSA) for real-time polling service (rtPS) or guarantee bit rate (GBR) in the uplink direction in the forth-generation (4G) systems. In CSA, a mobile subscriber (MS) gains its contribution credit value at the end of each transmission time interval (TTI), which is based on the contribution of MS to the radio resource scheduling. The base station (BS) schedules the bandwidth according to the credit value. Simulation results show that CSA achieves higher fairness in bandwidth allocation while connection drop rate and queuing delay are also guaranteed as compared to the roundrobin (RR) and early deadline first (EDF) mechanisms.
Highlights
IMT-advanced evaluation guidelines and minimum performance requirements of fourth generation (4G) published by the International Telecommunication Union Radiocommunication Sector (ITU-R) in 2008 [1] guide the goals for outstanding systems such as IEEE 802.16m [2] and long term evolution advanced (LTE-A) [3]
The radio resource is controlled by a base station (BS) in a centralized way; that is, the BS plays a role of resource distributor and scheduler to the mobile subscriber (MS) for uplink (UL) or downlink (DL) traffic
We summarize the following key parameters which are closely relative to the efficiency of variable bit rate (VBR) real-time polling service (rtPS) or guaranteed bit rate (GBR) scheduling in the UL: (1) the total amount of bandwidth which is required by all connections, (2) the amount of bandwidth which is allocated by scheduler, and (3) the delay constraint of each connection to buffer status report
Summary
IMT-advanced evaluation guidelines and minimum performance requirements of fourth generation (4G) published by the International Telecommunication Union Radiocommunication Sector (ITU-R) in 2008 [1] guide the goals for outstanding systems such as IEEE 802.16m [2] and long term evolution advanced (LTE-A) [3]. In those standards, the IEEE 802.16 MAC layer provides five types of services [2]. Since the resource of the system is limited, to avoid leading the QoS violation, the BS has to allocate the available bandwidth accurately and effectively Both 802.16m and LTE-A standards did not define any scheduling algorithms and left them to be implemented by individual venders [6].
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