Wireless Customer Research Articles

Low-Profile Dual-Band Filtering Patch Antenna and Its Application to LTE MIMO System

This paper presents a low-profile dual-band filtering antenna element and its application to long-term evolution (LTE) multiple-input multiple-output (MIMO) system for wireless customer premise equipments (CPEs). The proposed element consists of two separate U-shaped patches operating at different frequencies and a multistub microstrip feed line. For size miniaturization, the smaller U-shaped patch is embedded in the larger one. In addition, the multistub feed line can generate two controllable resonant modes as well as two nulls in realized gain at the boresight direction. Since the modes of the patches and multistub feed line can be controlled individually, the two operating bands can be tuned to desired frequencies. Also, the radiation nulls in boresight gain can be controlled, high roll-off rate and out-of-band radiation rejection levels are thus obtained. For demonstration, a low profile ( $0.009\lambda _{0})$ dual-band filtering antenna element operating at 1.9 and 2.6 GHz for TD-LTE applications (B39- and B38-bands) is implemented. Dual-band bandpass responses and four radiation nulls are observed in the experiment. Measured in-band gains are 6.7 and 7.3 dBi, whereas out-of-band gains are less than −10 dBi. Based on this element, a four-element MIMO antenna is further designed for LTE CPEs, where low profile and high integration of multiple components are required. A low mutual coupling of less than −19.2 dB and the low envelope correlation coefficients of better than 0.2 are obtained with a small edge-to-edge spacing of $0.15\lambda _{0}$ .

Can I please keep my number?

ABSTRACTA wireless customer for Wonderphone breaks her phone and cancels her current contract using an online customer service chat room. She was falsely informed by the customer service representative that she would be able to keep her wireless phone number if she purchased a new phone. When she goes in-store to purchase a new phone the service rep informs her, “You are not allowed to keep the same phone number.”

Getting what you paid for: Fighting wireless customer churn with rate plan optimization

The wireless telecommunication industry is highly competitive and managing customer churn is of great concern to wireless carriers as the market matures. Recent research has indicated that wireless rate plans are complicated and confusing to customers, and that wireless carriers are taking advantage of the situation by charging a very expensive per-minute rate for voice minutes beyond the monthly usage allowance. This article revisits an emerging database marketing strategy known as rate plan optimization and explores the importance of having customers on suitable rate plans. After conducting research on 11 525 residential customers from a Canadian wireless carrier, it is discovered that 55.4 per cent of them are subscribing to the wrong rate plans and these customers are churning faster than those with optimal ones. This article argues that proactively matching customers to optimal rate plans can contribute to customer churn reduction, although short-term profitability has to be sacrificed by the carriers in order to realize these benefits.

Maximizing Productivity Using CRM Within the Context of M-Commerce

One of the major subjects in information technology which has an outstanding influence in this field and in marketing and management area is mobile commerce. It is a key concept for variety of businesses. However, it has not fulfilled the expectations. This paper tackles the problems of mobile commerce in three separate approaches. First, it emphasizes the relative significance of customer relationship management and its relationship with mobile commerce. Second, it illustrates the ways of amplifying E-loyalty of the clients within small and medium enterprises. Eventually, the positive relationship among these, three concepts will be discussed. M-Commerce constitutes a substantial future market worldwide. This paper argues that businesses should strengthen and enhance loyalty as well as e-loyalty and M-Commerce activities, to better obtain the customers toward wireless marketing and customer relationship pathways. Moreover to get the extreme profitability businesses must generate value for consumers in a way that is different from what they get used to prior to the latest version of services from the businesses. This paper, introduces a new area of doing business with the assistance of CRM and some evaluators to grasp loyalty under the context of mobile commerce. Furthermore, businesses should consider consumer’s willingness to use successful features of M-Commerce. While performing the project, we expect to achieve productivity and reputation to the organization.

Proxies + path prediction: improving Web service provision in wireless-mobile communications

Mobile computing is considered of major importance to the computing industry for the forthcoming years due to the progress in the wireless communications area. A proxy-based architecture for accelerating Web browsing in wireless customer premises networks is presented. Proxy caches, maintained in base stations, are constantly relocated to follow the roaming user. A cache management scheme is proposed, which involves the relocation of full caches to the most probable cells but also percentages of the caches to less likely neighbors. Relocation is performed according to the output of a user movement prediction algorithm based on a learning automaton. The simulation of the scheme shows considerable benefits for the end user.

Business Models for Mobile Content: The Case of M-Games

It has been difficult to develop a profitable business model for Internet content. The emerging medium of mobile communications promises a new opportunity for this type of business because the gatekeeper for the medium, the wireless network provider (WNP), has greater control over what customers can feasibly do with their mobile devices. Higher barriers to entry and usage costs for mobiles should lead to the development of content business models that are more likely to generate profits. Within the mobile value chain, the WNP has the greatest bargaining power and can thus negotiate the largest share of profits. This paper examines the transformation of an industry as it moves toward a mobile, as opposed to Internet, focus. Mobile games are expected to generate substantial revenue but service providers will have to examine where they fit within the new value chain. The most appropriate strategy for WNPs is to leverage their control over wireless infrastructure and customer relationships. The management com...

Supporting the WWW in wireless communications through mobile agents

Mobile computing is considered of major importance to the computing industry for the forthcoming years due to the progress in wireless mobile communications. We present a proxy-based architecture that manages to accelerate Web browsing in wireless Customer Premises Networks (CPN). We discuss how such an architecture is implemented using the IBM Aglets framework for mobile agents. The suggested architecture relies heavily on proxy caches --- maintained in base stations --- which are relocated to follow a roaming user in other control areas (clusters of cells). The cache management scheme involves relocation of full caches to the most-likely-to-be visited control areas, but also fractions of the cache to less-likely-to-be-visited neighbours. A movement prediction algorithm, based on a learning automaton, is used to determine the future location of the terminal. The discussed architecture components have been implemented as Aglets to allow for the efficient introduction of the service in a CPN infrastructure.

Location management in wireless ATM customer premises networks

This paper introduces a new location management protocol, called LAMPS (Location Agents and Mobile PNNI Scheme), that is suitable for wireless ATM customer premises networks. LAMPS takes advantage of the PNNI routing functionality to advertise the movement of mobile terminals within pre-defined areas. Furthermore, it uses specialized entities to store and retrieve the current location area of the mobile terminals. These entities are located within mobility enhanced switches, that provide to mobile terminals connectivity with the rest of the network and supervise the execution of all mobility related procedures. In this paper, we compare LAMPS with similar mechanisms and we present the advantages that arise from its application. The efficiency of the protocol is demonstrated by the results of an analytical model.

A millimeter-wave full-duplex fiber-radio star-tree architecture incorporating WDM and SCM

We propose a full-duplex millimeter-wave fiber-radio network for providing wireless customer access to broadband services. It consists of a hybrid star-tree architecture connecting remote antenna base stations to a central control office (CO) by incorporating wavelength-division multiplexing (WDM) of the optical signals and subcarrier multiplexing (SCM) of the radio signals. These multiplexing schemes allow the sharing of equipment at the CO and therefore enable a simple radio distribution architecture to be implemented. We also demonstrate a 35.5-39.5-GHz full-duplex fiber-radio star-tree network, featuring three WDM carriers in the downstream and a single carrier in the upstream. Each downstream wavelength carries three 155-Mb/s BPSK SCM channels between 35.8-39.3 GHz, while a 37-GHz carrier transports 51.8 Mb/s upstream.

MAC protocol and traffic scheduling for wireless ATM networks

The Medium Access Control (MAC) protocol defined in the Wireless ATM Network Demonstrator (WAND) system being developed within the project Magic WAND is presented. Magic WAND is investigating extensions of ATM technology to cover wireless customer premises networks, in the framework of the Advanced Communications Technologies and Services (ACTS) programme, funded by the European Union. The MAC protocol, known as MASCARA, uses a dynamic TDMA scheme, which combines reservation- and contention-based access methods to provide multiple access efficiency and quality of service guarantees to wireless ATM terminal connections sharing a common radio channel. The paper focuses on the description of PRADOS, a delay-oriented traffic scheduling algorithm, which aims at satisfying the requirements of the various traffic classes defined by the ATM architecture. Simulation results are presented to assess the performance of the proposed algorithm in scheduling transmission of variable bit rate connections.

Wireless intelligent ATM network and protocol design for future personal communication systems

This paper presents the wireless intelligent ATM (WIATM) network, designed to provide wireless broadband integrated services. The WIATM network takes advantage of the ATM-cell relay paradigm for integrated services through a radio link with quality of service (QoS) guarantee. The design of the WIATM network architecture is an independent wireless network, which is consistent with the inherent cellular/PCS network architecture, as a wireless customer premises equipment/network (CPE/CPN) to access the ATM transport network in the B-ISDN infrastructure. An independent network architecture design separates the wireless access network from the ATM backbone network; this provides flexibility for wireless resource management with low rate source codecs with minimal tolerable QoS considered to increase the spectral efficiency, and mobility support by taking advantage of the functionalities of the IS-41 circuit-switching handoff procedures. The protocol design of the air interface is to meet the QoS requirements of wireless B-ISDN services and to be compatible with that of B-ISDN UNI. A hybrid concatenated error control scheme distributed through the protocol layers is used to target individual QoS requirements of different services. The convolutional coding and interleaving in the wireless physical layer protocol are used to guarantee QoS of voice services. A concatenated coding with additional 36 bit BCH code in the wireless ATM layer, which replaces the VCI/VPI of the ATM header field, improves the QoS up to the requirement of video services. The VCI/VPI field in WIATM is an overlapped routing information routing with the address control by radio port controller, and is thus not needed in the wireless ATM layer protocol. The retransmission scheme for data service only is added in the wireless data link layer, which is on top of wireless AAL, to meet its QoS requirement. Examples of signaling flows for call registration, call setup, and supporting handoff are shown in the design of the wireless network layer protocol. The AIN (advance intelligent network) signaling functionalities are considered for multimedia service control in the access network and interconnection to the ATM network. A parent-child creative basic call state model (BCSM) for wireless integrated services is introduced in both call origination and termination.