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The standardization of the long term evolution (LTE) of 3G networks is currently carried through in 3GPP. With the deployment of frequency planning, the coexistence issue between TDD and FDD LTE systems is becoming urgent in certain frequency bands. In this paper, the detailed LTE system interference environment is investigated, including single system scenario and inter-system interference, network...
An effective node failure recovery scheme is very important in wireless peer-to-peer (P2P) file sharing networks. Most of the existing failure recovery protocols are based on backup path mechanism, in which a new path will be used if the original one breaks. However, due to the limited resources in wireless environments, the maintenance of backup paths is expensive. Moreover, the time spending on...
Femtocell is an emerging technology aiming for a better indoor coverage. Due to its low costs, high grade of service, promotion of fixed-mobile convergence (FMC) and no change of core network, it has drawn close attention from the standardization organizations and the industrial field. In the two-hierarchy networks composed of traditional macro cellular networks and the embedded femtocell hotspots,...
The system of cdma2000 1x EV-DO is introduced to provide fast and efficient broadband wireless access. Up to now, there are three versions, mentioned as reversion 0, A and B. A great number of techniques, such as hybrid-ARQ, adaptive modulation and coding, as well as multi-user diversity, support the system to have higher spectral efficiency and better performance. In this paper, technical background...
Since the permission of WiMAX (802.16e) as a member in IMT-2000 enables it to use 3G systemspsila bandwidth by WRC-07, more researchers have paid attention on the analysis of coexistence issue between WiMAX and WCDMA systems in 2500 to 2690 MHz band. In this paper, the detailed interference environment analysis, including several interference scenarios, network deployment, propagation models and interference...
On the reverse link of CDMA systems, two options are possible for resource allocation: rate control (RC) and centralized scheduling (CS). The rate control algorithm can be further divided into Common Rate Control (CRC) and Dedicated Rate Control (DRC). In CRC, each mobile station (MS) independently determines its reverse link rate using the system interference level information broadcasted by a base...
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