中国移动通信终端市场的需求与供给

根据实际数据和统计学原理对当前和未来中国移动通信终端市场的需求和供给进行了分析。分析结果表明，预期的中国移动用户的饱和时间大约是2014年，饱和时的普及率是69．7％，移动用户总数是9．1亿，届时手机的年需求量将达到4．5亿部。分析也表明，1999～2006年“黑手机”所占市场份额为29％，而且有增长的趋势。     

中国手机产业竞争能力分析

我国手机生产企业从1999年的5家发展到2002年的37家，已形成年产手机1．5亿部的生产能力。国外厂商一直在主导手机市场发展潮流，国产品牌手机厂商则实现了群体突破：核心技术上没有自主知识产权和产品设计方面是严重限制国产手机快速发展的瓶颈。目前．国内手机市场竞争的情况主要表现在以下方面：产品策略的变革．趋向大众消费领域，规模化战略奠定竞争优势．品牌形象的突破，营销模式的创新．渠道之争日趋复杂。     

Effect of a policy intervention on handset subsidies on the intention to change handsets and households’ expenses in mobile telecommunications

This study examined effect of a policy intervention that provides an upper limit for handset subsidies on users’ intention to change handset and households’ expenses on mobile telecommunications. The Korean government has prohibited mobile network providers from providing excessive subsidies for mobile handsets to attract subscribers since Nov. 2014 according to the mobile act. Using the exogenous variation, we estimate the impact of the policy on the intention to change handsets and expenses on handset installment, total mobile communications, and online content. The longitudinal data are from the 2014 to 2015 waves of the Korea Media Panel Survey. The mobile act lowered the predicted probability of switching handsets by 0.4% points. Moreover, the mobile act increased the predicted probability of any expense on handset installment by 7.5% points and had a significant impact on the amount of expenses on handset installment, with an increase of 7.8%. The mobile act lowered users’ willingness to switch handsets and increased spending on handset installment. This increased burden in handset installment might shrink the online content market, which has a large need for government support, as well as decrease consumers’ welfare. We assert that the policy intervention on handset subsidies is questionable with regard to both consumer welfare and the healthiness of the ICT ecosystem.     

1999年中国蜂窝移动通信及手机市场走向分析

中国移动电话数已跃居世界第三位，增长速度在部分城市妆近或开始超过普通固定电话。而在设备市场上，中国开发的ＧＳＭ产品正在取得突破性进展，开始了国外产品的角逐，手机市场尤其如此。此外，中国移动通信标准的选择正处于关键时刻，可能影响到第三代移动通信技术的选用。     

Is Europe set for 3G? [3G communications]

Lack of mobile handsets, reluctance to use video features and a limited number of 3G basestations are still plaguing the rollout of third generation communications networks. This article reviews the current situation of UMTS in Europe along with forecasted future trends.     

Statistics of measured body loss for mobile phones

The variation in body loss for different users of a cellular handset is investigated. Measurements involving 200 test users of mobile communications (GSM) handsets have been performed and statistics are presented for a handset with three types of antennas. Differences in the body loss of up to 10 dB have been observed between users, thus indicating that body loss measurements for handsets should include several test persons. Depending on the antenna type, 8-13 test persons are required to obtain an estimate of the mean body loss with a ±1 dB confidence interval at a 90% level     

The ideal communications service [PCN]

The development of personal communications network (PCN) technology in the United Kingdom is reviewed. It is argued that the perceived benefits of PCN, smaller handsets, improved communication quality, and increased capacity of the PCN technology, as compared with the competing cellular networks, are expected to give the personal communications concept mass-market appeal. Future technological developments for PCNs and issues concerning PCN development, including competition, pricing strategy and penetration, market confusion, and technological limitations, are discussed     

Printed antennas for dual-band GSM/DCS 1800 mobile handsets

The recent developments of dual-band dual-mode D-AMPS/AMPS mobile handsets and radiostations has increased pressure on GSM service providers to follow similar technology breakthroughs as a first step towards IMT2000. A frequency-agile device accommodating both GSM standard frequency bands would serve more than 25 million GSM subscribers, with expectations as high as 100 million subscribers by the year 2000. Novel dual-band printed bow-tie antenna elements developed for dual-mode GSM/DCS 1800 handsets are described     

Telecommunications [Brazil]

Although information technology is a burgeoning industry in Brazil, the closely related telecommunications sector has not kept pace. A huge, unsatisfied demand must wait for private investment to upgrade and expand services and offer new ones. With the government committed to selling to private interests much of the telecommunications sector, US long distance and regional telephone companies, and many value-added resellers and equipment vendors are mapping out business strategies for the country. Today, the telecom market is worth US $8 billion, and could grow to $11 billion by the end of 1998. Between 1996 and 1999, an estimated US $32 billion must be invested in Brazil's communications infrastructure to raise the basic wire-line connections to a desired 33 million, up from 14.2 million in April 1994. Telebras, the government communications company, could perhaps come up with half of the amount needed. The remainder will have to come from private investors, domestic and foreign, hence the Ministry of Communication's desire to sell-off government-owned telecommunications firms     

Big push is on [mobile phones]

Nokia's announcement that all its new handsets will include 'push to talk' (PTT) as a standard feature means that 2004 could be the year when text messaging is finally eclipsed as the dominant mobile technology. Already established for business use in the US, PTT is predicted to create a new telecoms market worth more than $50bn within five years. The technology is usually likened to giving handsets walkie talkie functionality, allowing groups of up to 10 users to communicate without dialling a number or waiting for anyone to pick up. Benefits for business users-like security patrols or maintenance staff who operate over a wide area but need to keep in touch are obvious and outweigh the fact that only one person can speak at a time.     

智能手机病毒的发展及其对策研究

随着手机向智能化发展及移动网络的迅速发展,智能手机病毒逐渐在移动终端和网络中出现。智能手机病毒发展迅猛,传染快,破坏性大,需要用户、网络运营商、手机制造商以及反病毒软件商等各个方面高度重视,做好对策研究。     

Measurement of EMI on network cables due to multiple GSM phones

As the density of transmitters from mobile telecommunication systems continues to increase there is a greater risk of electromagnetic compatibility (EMC) problems due to the ensemble electromagnetic field from multiple mobile handsets. An analysis of the characteristics of the threat field from multiple handsets is presented allowing prediction of the statistics of the ensemble field. A measurement system designed to detect electromagnetic interference (EMI) from ensembles of cellular phones has been used to quantify the level of EMI on Ethernet cables from multiple global system for mobile communications (GSM) mobiles. The measurements are consistent with a simple statistical model of ensemble signals from GSM sources and electromagnetic modeling of the system     

Fast Firmware Implementation of RSA-Like Security Protocol for Mobile Devices

In modern mobile communications, personal privacy and security are of top concern to mobile phone subscribers. Yet, owing to the limit of their processing capability, mainstream mobile manufacturers are still unable to apply advanced security protocol to mobile devices. It should be noted that many security protocols are based on RSA algorithm. To implement RSA algorithm and thus apply many advanced security protocols to mobile networks, this paper proposes an efficient and practical method based on the Texas Instruments TMS320C55x family. When the proposed method is employed, it takes only 7.9 milliseconds to perform a 1024-bit RSA encryption operation at the clock frequency of 200 MHz. Our decryption operation is at least 3.5 times faster than the time taken to perform the same operation without employing the proposed method. In addition, the proposed method can stop any power-analysis attack on RSA-based security protocols, thereby enhancing the security of mobile environments.     

从WAP的应用看移动因特网的发展

ＷＡＰ技术的开发与应用揭开了移动因特网发展的崭新一页,据预测,到２００４年亚太地区移动用户数将达到３．７亿,其中移动数据用户将占１．６亿;移动电子商务市场也将于２００３年超过固定电子商务市场。移动互联网未来的热点包括企业网的无线应用、与位置相关的服务以及移动电子商务。     

Market analysis for the next‐generation mobile communications (DMB) service from the perspective of innovation adoption and diffusion

This study examines market acceptance for the satellite digital multimedia broadcasting (DMB) service, one of the touted new business models in Korea's next‐generation mobile communications service market, using adoption and diffusion of innovation as the theoretical framework. Market acceptance for the satellite DMB service was assessed by predicting the demand of the service using the Bass model, and the demand variability over time was then analysed by combining the innovation adoption model proposed by Rogers (Diffusion of Innovations (5th edn). The Free Press: New York, 2003). In our estimation of the Bass model, we derived the coefficient of innovation and the coefficient of imitation using actual diffusion data from the mobile telephone service market. We also reorganized the demand data along the diffusion timeline according to Rogers' innovation adoption model, using the responses by survey subjects concerning their respective projected time of adoption. The demand prediction model revealed that diffusion for both took place forming a classical S‐curve. Concerning variability in demand for the satellite DMB service, our findings, much in agreement with Rogers' view, indicated that demand was highly variable over time and depending on the adopter group. This study, as an attempt to measure the market acceptance for the satellite DMB service, a leading next‐generation mobile communications service product, stands out from related studies in that it estimates the nature and level of acceptance for specific customer categories, using theories of innovation adoption and diffusion and survey results conducted through one‐to‐one interviews. The findings and theoretical application procedures provide practical insights into further research on market analysis of new mobile communications service‐related products. Copyright © 2007 John Wiley & Sons, Ltd.     

Reducing the cost of Bluetooth systems

The Bluetooth^TM industry has set itself an ambitious goal of just $5 for the implementation of a complete receiver/transmitter, including its DSP-based subsystem and associated ROM and RAM. Although this is unlikely to be realised until Bluetooth wireless technology has achieved considerable market penetration and gained economy of scale through very high volume production, some manufacturers appear to be closer to this goal than others. CSR, for example, had shipped over 1 million of its BlueCore single-chip Bluetooth radios by June this year, and 48% of all Bluetooth equipped end-user products on the market now contain this chip. This article takes a look at some of the design techniques that CSR has employed to reduce cost as much as possible, and outlines some of the issues that are likely to affect how quickly the market ramps up     

基于改进的Stackelberg模型的中国移动通信市场份额分析

 根据修正后的Cournot 模型和Stackelberg模型,本文分析了电信业重组前双寡头垄断下移动通信市场的市场份额,并用数据验证了分析结论;同时分析了电信业重组后三寡头垄断下移动通信市场初期以及成熟期的市场份额。     

手机电视芯片商用情况及发展趋势

目前，手机电视业务在全球非常热门。开展手机电视业务，手机必须添加调谐器、解调器、解码器等模块，接收和处理电视信号，对手机的体积和功耗提出了巨大挑战。采用特殊的手机电视终端芯片可以解决问题，是顺利开展手机电视业务的必要条件。集成单芯片手机电视终端，双模、多模芯片手机电视终端，接收模块集成于SD存储卡内的手机电视终端均已开始商用。未来，体积小、功耗低的手机电视芯片的应用，将会大大促进手机电视业务的普及。     

高普及率通信市场的收入可持续增长模式研究

随着普及率逐渐攀升,广东移动的折扣前收入增长开始偏离历史增长的趋势线,如何实现高普及率下的收入可持续增长意义重大。珠海作为广东省高普及率强竞争的典型,从2003年普及率突破100%以来收入增长多年持续保持较高水平。通过研究珠海收入增长的历史,发现通过强化品牌优势的存量保有策略以及深化数据业务运营的增量提升策略是珠海高普及率市场下收入可持续增长的重要模式。