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To: 49thMIMOMander who wrote (10005)	3/22/2001 1:34:07 PM
From: Eric L	Read Replies (1) \| Respond to of 34857

re: AWS on GSM/GPRS "Applications & Services" Plans >> AT&T Wireless Moves Forward With Plans for GSM/GPRS and Other Services Announces Relationships With Application Providers, Device Manufacturers And Systems Integrators Las Vegas - CTIA AT&T Wireless Press Release AT&T Wireless (NYSE: AWE) continued laying the groundwork for offering GSM/GPRS services later this year, by announcing relationships that will provide new applications and services for a variety of devices. At the Cellular Telecommunications Industry Association show being held at the Sands Convention Center, AT&T Wireless announced it would work with Accenture, Compaq Computer, MDSI and Siebel Systems, Inc. to provide customers with a variety of advanced wireless services. The company also said it has entered into a letter of intent to work with Tellme Networks, Inc. to provide customers with a voice interface for accessing information. "These companies recognize the flexibility and scalability of a GSM/GPRS network and have shown their support through their actions," said Rod Nelson, chief technology officer for AT&T Wireless. "We welcome the opportunity to work with these companies and invite others to join us now and as we continue to move forward with our network plans." Deploying the GSM/GPRS network will offer the benefits of more advanced mobile data services beginning later this year, and supports the company's plan to begin deployment of UMTS, the 3G global standard, sometime in 2003, subject to the availability of network equipment and customer devices. The company said since announcing its decision to deploy a GSM/GPRS network last November, over 100 companies -- including application providers, systems integrators and computer, PDA and phone manufacturers -- have announced GPRS products or services within their areas of expertise. To increase the number of customer applications available for its GSM/GPRS network, AT&T Wireless will expand its existing Data Developers Program. The program, which already enables development of Circuit Digital Packet Data (CDPD) applications, will now allow developers to adapt current applications for use on the company's GSM/GPRS network. The program provides application developers, current or future, with information about browser specifications, style guides, software development tools, and even advanced technology lab access. AT&T Wireless invites developers -- including companies with applications running on competitor's networks -- to join at attws.com. Accenture AT&T Wireless and Accenture, formerly known as Andersen Consulting, have signed a Letter of Intent to deliver enterprise customers a corporate wireless service based upon Accenture's Mobile Solutions Platform (MSP). The MSP is a multi-tiered platform consisting of a portfolio of services such as security control, personalization, navigation and related tools, all designed to facilitate access among an enterprise's legacy systems, applications, and mobile devices. *Compaq Computer* AT&T Wireless and Compaq will co-market wireless data solutions to enterprise customers throughout North America. Combining Compaq's innovative technology and telecommunication expertise with AT&T Wireless services and third party applications, enterprise customers will receive a total solution package. Compaq's innovative iPAQ Pocket PC and laptops, equipped with optional wireless communications capabilities, will provide the crucial mobile access link to users of enterprise data solutions marketed and served by AT&T Wireless. MDSI MDSI(R) has agreed to bundle AT&T Wireless' network services in connection with the sale of its Advantex(TM) ASP and eService Manager Mobile(SM) wireless workforce management products, and other wireless services hosted by MDSI. MDSI's Internet-based software solutions enable medium to small size service organizations to schedule, assign, dispatch, update, complete, and report on service work orders and the mobile workers who execute them, and empower those workers with reliable wireless links to enterprise or Internet applications. MDSI currently uses AT&T Wireless' CDPD network to deliver these products, as well as its enterprise Advantex application for large service providers, over wireless-enabled laptops and PDAs. Siebel Systems, Inc. AT&T Wireless and Siebel Systems announced a strategic alliance to jointly market and provide wireless access to Siebel eBusiness Applications via AT&T Wireless' GSM/GPRS network. Siebel eBusiness Application is an integrated family of Web-based sales, marketing and customer service applications that help organizations manage relationships with their customers. Tellme Networks, Inc. The letter of intent with Tellme Networks, Inc. focuses on a co-branded consumer voice service which would be available to all AT&T Wireless customers. This service would give customers direct, short-cut access to powerful and compelling services and content by speaking instead of "clicking." Combining the benefits of the Internet with advancements in voice recognition, the new voice service would easily let AT&T Wireless customers do much of what they want to on the Net by speaking into the phone and listening to the response. Customers would simply "speak out" to gather a wide range of information, and can then customize and personalize it to meet their individual needs -- from getting a taxi to checking stock quotes or sports scores, to wake up calls, airline information to horoscope predictions. "Along with these relationships, we will soon be offering our consumer customers the ability to access information by simply speaking their request," said Nelson. "Providing a voice interface is an important component in the mix for offering access to information. This voice activated service is network agnostic, so customers can retrieve information now and as we move toward 3G." Additional details are available from news releases issued today by some of the companies. << - Eric -

To: 49thMIMOMander who wrote (10005)	3/25/2001 4:54:40 PM
From: S100	Respond to of 34857

Here is a little more stuff for the pot. ---- 1.3 Applications of DS-SS in Mobile Communication Despite its difficulties, which are easily solved with optimized system design, CDMA does have its advantages when applied to mobile communications. First of all, a CDMA system can readily take advantage of the voice activity of normal human speech. In a two-person conversation, each speaker is active less than half of the time. During the quiet period, the transmitters could effectively turn off and reduce interference power introduced into the channel. This reduction in interference can translate into capacity gain for the system. Theoretically, FDMA and TDMA systems could also take advantage of the speech statistics. However, the implementation is more complicated as radio resources, such as FDMA channels or TDMA time slots, need to be dynamically assigned in real time by the network infrastructure. The second advantage is that in CDMA, the physical RF channel can be reused in every cell, thus giving a frequency reuse factor of close to 1. In a conventional AMPS system, the available spectrum is divided into chunks and assigned to different cells in the system. Cochannel frequencies are not used in adjacent cells to avoid interference. A popular frequency-assignment plan is the N = 7 reuse pattern, where the spectrum is divided into seven chunks, and each chunk is assigned to one of the cells in a seven-cell cluster. The same chunk is reused again approximately two cells away in the next cluster. The consequence, however, is that the number of channels per cell is reduced by the reuse factor (seven in the N = 7 reuse pattern) [5] .The reuse could be increased via sectorization. In CDMA, the same physical channels are used in every cell, but the same cochannel interference problem also exists; on the forward link (i.e., base station to mobile station link), each user in a given cell is being interfered with by powers from its own cell as well as by powers from other cells. On the reverse link (i.e., mobile station to base station link), each cell is being interfered with by users in its coverage area as well as by users located in other cells.There exists no simple analytical solution to quantify the corresponding cochannel interference in CDMA, as the amount of interference depends on the distribution and number of users and terrain. However, there is no need to frequency plan in CDMA, which may be one of the welcoming benefits for RF design engineers. The third advantage is CDMA's ability to mitigate multipath distortion [6]. If multipath distortion is fixed with time, it can be effectively countered by adaptive equalization. If, on the other hand, it is rapidly varying with time, as in a mobile environment, it would be difficult to adapt sufficiently fast. Spread spectrum, and in particular direct-sequence spread spectrum, gives an extra measure of immunity to multipath distortion. This result can be seen clearly in the frequency domain where the multipath distortion leads to a null in the frequency band. This null severely affects a narrowband signal if the null occupies I a significant portion of the bandwidth. But the same null would have less effect on a spread broadband signal [2]. Furthermore, a CDMA system can take advantage of multipaths by using the rake receiver, which demodulates and uses the signal energy of all paths. The effects of propagation on signal spectrum are discussed in Chapter 2. From CDMA RF System Engineering by Samuel C Yang. What I find somewhat hard to understand is why "bonding 4 channels" in GPRS is BAD but doing it with 8 channels in CDMA is GOOD. Message 15557515 Guess the magic word is "links". Hope not a case of "Mad Q Disease".