The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Opportunistic spectrum access (OSA) currently receives a constantly growing interest due to the under-utilization of the licensed spectrum. OSA refers to identifying and exploiting spatiotemporal underutilized spectrum portions in order to be occupied by unlicensed-secondary users. The efficiency of an OSA scheme is strongly correlated with the adopted sensing strategy and primary user activity model...
The growing demand of mobile wireless internet access has prompted rapid growth of wireless data services. The key issue of wireless cloud is to provide complex services by using the available resources within reasonable cost. Accompanying the emergence of integrated wireless and mobile networks (e.g. WLAN, 3G/4G net), it makes a challenge of networks as service to supporting the complete lifecycle...
With the goal of the interference decreasing at subcarrier level, the allocation of frequencies is considered in this paper. This allocation can be seen like a permutation of frequencies. This paper propose a new analyzing tool for the frequencies permutation used in WiMAX mobile communications: the interleaving distances spectrum (IDS). This tool can offers an efficiency measure for these permutations...
A novel fair mapping scheme is proposed in this paper for the IEEE 802.16 downlink sub-frame. The mapping process is critical since it allocates the users' requests into the downlink sub-frame in order to be sent to the mobile stations. One of the most noticeable issues in this area lies on the fairness aspect. Giving that the mapping process defines the order and the way that the users' requests...
Wireless mobile multimedia communications are being greatly increased in the number of users, diversity of applications and interface technologies. Future mobile based Internet will accommodate various wireless technologies and also will need to provide sufficient end-to-end QoS (Quality of Service) mechanism to provide enhanced user's satisfaction. In this paper, we propose a new adaptive end-to-end...
Radio spectrum and network infrastructure are two essential resources for mobile service delivery, which are both costly and increasingly scarce. In this paper we consider drivers and barriers of network sharing, which is seen as a potential solution for scarcity in these resources. We considered a full sharing scenario for a Mobile Network Operator using the Business Model Canvas method, and concluded...
Mobile handset manufacturers are introducing new features that allow a user to configure the same handset for seamless operation with multiple wireless network providers. As the competitiveness in the wireless network service market intensifies, such products will deliver greater freedom for the mobile users to switch providers dynamically for a better price or quality of experience. For example,...
Carrier Aggregation (CA) has been regarded as an important technology for Long Term Evolution-Advanced (LTE-A) which is currently standardized in the Third Generation Partnership Project (3GPP). CA is introduced to meet the requirement of very-high-rate-data transmission over wide bandwidths e.g. up to 100MHz. In this paper, the problem of power allocation restriction in the LTE-A system with CA has...
A Resource management is one of the important services that are offered in any network. Mobile ad hoc network (MANET) is a gathering of mobile wireless nodes that are located in dynamic network with unnecessary using pre-existing infrastructure all mobile nodes which are free for any movement to any side and they are less network. This network is going ahead to zero configurations that would create...
We propose an all-optical access-metro network, allowing the support of fixed and mobile services. This architecture provides transparent end-to-end communications with two transmissions mode: circuit mode and burst mode. Real time services are transported using circuit transmission and other services are transported using burst transmission. In order to optimize the network resources, we evaluate...
Utility function recently has been adopted in network studies to describe quality of service. However, the existing utility functions focus only on the effect of power or throughput, so are not suitable to delay and disruption tolerant networking (DTN), where delay and disruption have major impacts on the utility and cannot be ignored. This paper proposes a corresponding sigmoid utility function,...
The new mobile wireless metropolitan area network (WMAN) architecture imposes a demanding performance requirement on the radio resource to provide broadband internet access. The radio resource is partitioned as bursts in time and frequency domains and used by mobile stations (MS) in an exclusive manner. The base station (BS) functionally serves as a resource controller for traffic to and from the...
Relayed transmission is an interesting topic in cooperative diversity. Some researchers propose power allocation schemes for relayed transmission by only considering transmission through a fixed relay node. In our paper, we analyze a relayed transmission through a mobile relay node. We build up a transmission system model and determine the long term distribution characteristics of the movement of...
This paper extends the discrete Verhulst power equilibrium method, previously suggested in to the power-rate optimal allocation problem. Multirate users associated with different types of traffic are aggregated to distinct user' classes, with the assurance of target rate allocation per user and QoS. Therein, single-rate Verhulst power allocation algorithm was adapted to the multirate DS/CDMA power...
This paper addresses the issue of wireless resource allocation of a Mobile WiMAX cell based on OFDMA access technique. We compare two strategies: the MAX SNR which is the most used channel assignment technique and our proposal which is based on channel condition learning. As we distinguish four IEEE 802.16e-2005 service classes: UGS, rtPS, nrtPS and ErtPS, we combine these strategies with a scheduler...
There is a problem of unfairness in allocation of radio resources among heterogeneous mobile terminals in heterogeneous wireless networks. Low-capability mobile terminals (such as single-mode terminals) suffer high call blocking probability whereas high-capability mobile terminals (such as quad-mode terminals) experience very low call blocking probability, in the same heterogeneous wireless network...
The Next generation wireless network (NGWN) will be heterogeneous in nature where different radio access technologies (RATs) operate together .The mobile terminals operating in this heterogeneous environment will have different quality of service requirements to be handled by the system. The radio resource management is one of the key challenge in NGWN. Call admission control is one of the radio resource...
Mobile network has been tremendously increased in the number of users, diversity of applications and of interface technologies. Also mobile network need to provide sufficient adaptive End-to-End QoS management mechanism to provide enhanced user satisfaction. In this paper, we propose a new adaptive End-to-End QoS management mechanism based on the concept of utility function which we have borrowed...
Mobile ad-hoc networks (MANETs) are infrastructure-less, multi-hop wireless networks. Nodes in the MANET have to be configured with unique addresses for unicast communications. As the nodes are mobile, the centralized administration does not suit for auto-configuration. So, we need a distributed address auto-configuration scheme for MANETs. Most of the existing schemes use DAD to ensure uniqueness,...
Mobile WiMAX systems based on the IEEE 802.16e standard require all downlink allocations to be mapped to a rectangular region in the two dimensional subcarrier-time map. Many published resource allocation schemes ignore this requirement. It is possible that the allocations when mapped to rectangular regions may exceed the capacity of the downlink frame, and the QoS of some flows may be violated. The...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.