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The majority of vehicle-to-vehicle (V2V) protocols presented in the literature utilize a combination of controlled access techniques (e.g., TDMA, FDMA, CDMA) to provide prioritized access to the communication medium. While these protocols split the capacity of the communication link to support a maximum number of users with different priority levels, our work utilizes a combination of CDMA and TDMA...
In OFDMA systems, reducing the inter-cell interference among adjacent cells is a very important issue especially for the cell-edge users. In this paper, we propose a distributed algorithm that maximizing the system total throughput considering proportional fairness. In our proposed algorithm, the frequency resources in each cell is divided into high and low power regions. The bandwidth allocations...
In this paper, a discrete stochastic dynamic programming model for the high speed downlink packet access (HSDPA) downlink scheduler when using finite-state Markov channel (FSMC) model is presented. The model then solved numerically (using value iteration) to find the optimal policy for the case of two users sharing the same cell using a 3-state channel. The optimal policy is the one that maximizes...
In this paper, we analytically analyze the performance of a path selection diversity scheme for downlink packet delivery. In the scheme, the scheduled user, where scheduling is based on First In First Out (FIFO) queueing systems, tries to select the best end-to-end path quality among L possible relays including his downlink channel for packet delivery. In this system communication between users is...
In this paper, we present an analytic model and methodology to determine optimal scheduling policy that involves two dimension space allocation: time and code, in high speed downlink packet access (HSDPA) system. A discrete stochastic dynamic programming model for the HSDPA downlink scheduler is presented. Value iteration is then used to solve for optimal policy. This framework is used to find the...
Future wireless cellular networks such as high speed downlink packet access (HSDPA) and 1x EVolution data optimized (1xEV-DO) promise to revolutionize the mobile user's wireless experience by offering high downlink data rates that are much more beyond what 2.5 G and 3 G cellular systems could offer. In order to support as many users as possible, these systems exploit the bursty nature of the data...
We determine a joint link activation and routing policy that maximizes the stable throughput region of time-varying wireless ad-hoc networks with multiple commodities. In practice, the state of the channel process from the time it is observed till the time a transmission actually takes place can be significantly different. With this in mind, we introduce a stationary policy that takes scheduling and...
Forecasts for emerging mobile device markets anticipate that bandwidth will be squeezed by demanding applications like multimedia on demand. This will spur the need for data rates beyond what the upcoming 3G wireless cellular systems such as UMTS can offer. To boost the support for such high data rates, HSDPA, labeled as a 3.5G wireless system, has been introduced in Release 5 of UMTS technical specifications...
In this paper we suggest a best-effort scheduler for high speed downlink packet access (HSPDA) systems that schedules resources in a way that achieves certain target QoS levels requested by users. Scheduling is based on adjusting the activity of a user such that the farther it is from the target the higher its activity becomes and vice versa. The objective of the algorithm will be to find the activity...
In this paper we suggest a new call admission control (CAC) algorithm for high speed downlink packet access UMTS systems;. In this algorithm the user requesting admission is gradually admitted to the system. This is done by setting a back-off factor limiting the new user's throughput. This factor tends to protect the already existing links that their rates do not drop below a certain quality of service...
In this paper, we propose a novel medium access control packet scheduler algorithm for high speed downlink packet access (HSDPA) to provide a priority scheduling between users based on their instantaneous channel conditions and their average throughputs. Simulation results show that the proposed algorithm outperforms the maximum CIR and proportional fair schemes in terms of providing minimum throughput...
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