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To cope with increasing mobile data traffic, researchers are currently working on traffic offloading techniques for delivering data over unlicensed cellular bands. Current offloading schemes based on offloading data to Wi-Fi regardless Wi-Fi has sufficient throughput or not. Though, we propose a novel offloading technique based on the Remaining Throughput Scheme (RTS) for Wi-Fi selection. In our proposed...
Joint transmission (JT) is one of multi-cell coordination schemes for efficient support of cell-edge users. In order to achieve high capacity based on JT, it is required to appropriately allocate transmit power such that it does not incur interference to other cells. In this paper, we propose a power allocation algorithm for JT based on multilateral bargaining model. The discount factor is defined...
In the previous TD-LTE systems, the semi-static TDD DL/UL configuration can not work effectively under the instantaneous varied DL/UL traffic. Dynamic TDD DL/UL reconfiguration was proposed and discussed as one of the key features in LTE-A to increase the radio resource utilization. However, the freely reconfiguration of each cell TDD DL/UL configuration may result in significant co-channel co-subframe...
Appropriate bandwidth allocation is an important issue to benefit the long Term Evolution (LTE) networks performance. Single-carrier FDMA (SC-FDMA) multiple access scheme has been chosen for the 3GPP LTE uplink scheduling. However, it requires that all the sub carriers allocated to a single user must be in contiguous frequency band within each time slot. This constraint limits the scheduling flexibility...
In current cellular networks base stations (BSs) usually perform independent scheduling without coordinating the resource allocation among different cells. This, however, often leads to high interference levels in cellular networks operating with universal frequency reuse, such as the 3GPP UTRAN Long Term Evolution (LTE). Coordinated scheduling between different BSs may mitigate this problem by taking...
This paper considers the transmission of scheduling information in orthogonal frequency-division multiple-access (OFDMA)-based cellular communication systems such as the Third-Generation Partnership Project (3GPP) long-term evolution (LTE). These systems provide efficient usage of radio resources by allowing users to be dynamically scheduled in both frequency and time. This requires considerable amounts...
Two main draft standards were submitted in October 2009 as candidate technologies for IMT-Advanced, namely IEEE 802.16m and 3GPP LTE-Advanced. However, several details on their functionalities are still open and the research community is racing towards the complete definition of the revolutionary next fourth generation mobile, 4G. In this framework the European Celtic project WINNER+ is bridging together...
Channel-aware scheduling is one of the advanced features introduced in the uplink of long term evolution (LTE) in order to improve the system spectral efficiency. In the uplink of LTE channel-aware scheduling is possible thanks to the transmission of sounding reference signals. In this paper the performance of frequency and time domain scheduling in LTE uplink is investigated. In particular, we focus...
In this paper, we propose distributed dynamic resource allocation schemes for future cellular networks to enable efficient utilization of the whole available frequency spectrum. Our algorithms are simple, so that fast resource allocation decisions can be made at the base stations. To enable coordination between base stations, our schemes require inter-base-station signaling of system state information...
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