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A novel coordinated scheduling algorithm for OFDM-based systems in multi-cell scenario is proposed in this paper. The studied algorithm based on the utility function is general for the downlink of networks. The algorithm coordinates the subcarrier assignment over the BS cluster. We first establish the framework for this inter-cell coordinated optimization problem through utility-based method. The...
Femtocells applied in many existing systems, such as HSPA, 3GPP LTE, WiMAX, and etc, which cover a short range and offer an economically viable way to improve cellular system capacity, have caught world-wide researching interest nowadays. An interference coordination scheme is proposed for LTE downlink in this paper, which is split into three steps named as interference graph creation, orthogonal...
Proportional fair (PF) scheduling is a widely used technique in recent wireless communication systems. However, scheduling will also bring about a lot of signaling overhead especially in OFDMA based systems which have many subchannels, assigning these subchannels to users and feeding back channel quality information to Base Station produce much overhead. In many situations, neglecting the overhead...
OFDM has become one of the most important Beyond-3G transmission technologies. Mobile WiMAX is a typical representative of OFDM systems. The cross-layer optimization problem of inter-cell coordinated resource allocation for OFDM systems is addressed in this paper. We first analyze the problem by utility-based method, and formulate this optimization problem. Then the globally optimal and a sub-optimal...
System-level simulation has been widely used to evaluate system performance. Simulation methodologies have also been comprehensively discussed in different organizations or institutions. Most of the simulation methodologies proposed, however, mainly focus on one area of specific technologies. How to evaluate the performance of multiple air interface systems (e.g., cdma2000, WCDMA, WiMAX, and their...
Mobile WiMAX based on IEEE 802.16e standard can realize enhanced network capacity requirements and various services as well as provide more novel experiences for users. Since WiMAX joining in 3G camp as the new member, the coexisting research of WiMAX and other 3G system (WCDMA, cdma2000 1x and TD-SCDMA) deployed in the same service area has gained increasing importance. In this paper, the detailed...
WiMAX (802.16e) has been recognized as an official member of IMT-2000 by WRC-07, which permits its use of 3G systems bandwidth, including 2500 to 2690 MHz. The work of coexistence interference analysis between WiMAX and WCDMA systems in 2.5 GHz band is a potential research field. This paper presents several interference paths, investigates the methods of evaluating two coexisting systems in details,...
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