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This paper proposes a novel distributed QoSguaranteed multi-cell radio resource allocation (RRA) scheme for OFDMA systems, which includes two separate steps operated on two time levels: the Hungarian algorithm based intra-cell fast scheduling on the frame level and the X2 interface based inter-cell interference coordination (ICIC) algorithm performed on the super-frame level. The scheme is distributed...
Quality of Experience (QoE) reflects the customer's perception of service, and is extremely important for operators. In VoIP service, variety of factors will affect customer's QoE, e.g. source data quality and the transmission channel condition. In cellular systems, although higher level of source coding will improve QoE, more radio resource will be consumed and thus degradation of system capacity...
Due to the short history of researches for wireless sensor network which has been emerging prominently since the early 1990s, the systemic assessment indicators and efficient evaluating methods of wireless sensor networks is still under exploring. Hereupon, the designing of systemic indicators and assessment methods inspired by the rough set theory are described in this paper to enrich the methodologies...
Significant throughput gains can be obtained in multi-user wireless system by exploiting the combination of multi-user scheduling in media access control (MAC) layer and MIMO spatial multiplexing using precoding in physical (PHY) layer. In this paper, we propose a multi-stage hybrid scheduling scheme for codebook-based precoding system, which applies different scheduling methods at different scheduling...
This paper presents an AP selection strategy in the office environment covered by WLAN. While most of the selection metrics balances the active load among neighboring BSSs, the quality of voice applications greatly depends on the call blocking probability which is decided by all the potential voice STAs. For this reason, we define a QoS-aware information element that is advertised from APs. On this...
Multiple route information is often necessary for ad hoc networks, to recover from quick topology and link status change, and to support load balanced multi-path routing as well as QoS consideration. However, most such research focused on multiple routes utilization or specific QoS metric design, and few of them consider how to obtain such multiple route information efficiently. In this paper we propose...
The secondary market spectrum policy adopted by FCC opens the opportunities of flexible spectrum leasing and transfer between wireless network providers (NPs). When trading and allocating spectrum with the emerging market-oriented approach, the wireless NPs need to consider the economic influence when determining the needed spectrum. This paper proposes flexible spectrum allocation (FSA) methods for...
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