Asian WiMAX Deployments to Threaten 3G Carriers

A number of Asian countries have resolved in recent months to adopt and promote WiMAX, a super high-speed wireless broadband technology which some analysts believe could ultimately threaten existing 3G wireless providers.

With its impressive bandwidth and range, WiMAX has the potential to cover anything from a bustling city to a remote village, and could be useful in both developed markets like South Korea and emerging ones like Vietnam.

The island nation of Taiwan is the latest proponent of WiMAX technology, granting six spectrum licenses in the past months, and pressuring the respective carriers to have their networks up and running within the next 18 months.

Analysts expect WiMAX equipment makers, such as Gemtek Technology Co Ltd., D-Link, ZyXEL Communication Corp., and Accton Technology Corp. to experience significant revenue growth in the coming quarters. Cell phone manufacturers like Samsung and LG are also likely to experience growth, as they begin to release WiMAX-enabled handsets and other devices.

“A key reason (to build WiMAX) is to drive the manufacturing industry for equipment vendors, and to create and nurture this ecosystem quickly,” commented Bill Rojas, the director of telecom research at International Data Corp (IDC).

Meanwhile in India, Equipment suppliers and operators are readying plans for the commercial rollout of WiMax broadband services in India though the Centre continues to dither on the broadband policy.

Said Protip Ghosh, vice-president, sales and marketing, Telsima Corp, which develops and provides WiMAX-based Broadband Wireless Access (BWA) and mobility solutions: “Though the government has set a target of 20 million by 2010, wire line will be able to cater to only five million and the rest will have to be met by wireless technologies such as WiMax.”

In fact, the technology is already being deployed by telecoms for hooking up their backhaul connectivity (between telecom towers) while widespread testing is on for commercial rollouts later.

BSNL, Reliance Telecommunications, VSNL, Bharti Televentures, Aircel, Sify, to name just a few, have already rolled out limited WiMax networks. Others like Tata Teleservices are testing networks at various places.

In fact, the biggest event being watched is the BSNL tender for 10,000 WiMax base stations slated to open sometime soon which could open the floodgates.

Telsima is looking to rollout a massive 10,000 WiMAX base stations and 1,00,000 WiMAX subscriber stations this year, most of them in India, according to Ghosh. Much will depend on how soon clarity on the broadband policy can be achieved by the Centre.

Interestingly, Telsima is already a supplier to VSNL and Reliance while Alcatel is currently in talks with the former to help in the commercial rollout of the technology.

“We are proud to be the first company to launch WiMax-based services in India,” Vinod Kumar, president (global data & mobility solutions), VSNL, told DNA Money. VSNL will extend its WiMax network to about 120 cities across India for enterprise customers and in five cities for retail customers by the end of the current financial year.

BSNL, which has undertaken pilots at 14 locations, is looking to roll out a WiMax network across 1,000 cities in the country.

In October 2006, Chennai-based mobile operator Aircel launched its broadband wireless access on WiMax and by December 2007, it will cover 44 cities.

An interesting thing to the whole broadband play will be the impending showdown between the WiMax players and the 3G lobby which, too, maintains that the WCDMA/HSPA standard is the best for broadband services for a country like India. “In our reckoning, WiMax will have only 5-10 per cent of the market,” said P Balaji, vice- president, marketing and strategy, Ericsson India, which is aggressively pushing the WCDMA technology.

In fact, given that choices have already been made in some 150 odd markets, HSPA will command a 75-80 per cent of the broadband market down in India, he said. However, given that Ericsson does not push WiMax technologies, one could perhaps take the opinion with a pinch of salt.

However, with less focus on mobility and powerful players like Intel aligned on its side, the WiMax lobby could emerge the winner in the long run.

FMC just a Hype?

According to Yankee group report, FMC is just a hype and its now fading.

Yankee Group revealed that fixed-mobile convergence (FMC) has strong potential to shake up the communications market for enterprise voice and mobility, but focus must shift from cost-savings to productivity in order for adoption to take-off. Today, FMC is sold with a focus on reducing cost for the enterprise, but with the subtext of productivity benefits for the end user. A consequence of this feature-focused approach is that FMC will not be the growth driver many carriers expect. Instead, it will be a necessary feature in carrier portfolios.

According to the recently published Yankee Group Note, Productivity Is the Prettier Face of FMC, enterprise adoption of FMC remains low. According to the Yankee Group Anywhere Enterprise—Large: 2007 European Fixed-Mobile Convergence Survey, only 2% of enterprises have deployed FMC. This number is even lower in the US and Canada. Competition from alternative mobility initiatives, technological immaturity and reduced priority placed on voice communications by IT decision-makers have contributed to this perception and low adoption rate. In addition, 29% of IT decision-makers surveyed in the Yankee Group Anywhere Enterprise—Large: 2007 US Fixed-Mobile Convergence Survey consider the technology nice to have, but not a critical application on their IT/networking road map. When combined with an adoption rate of less than 2%, this statistic does not bode well for FMC as it is currently configured and marketed.

"The FMC hype was a bit premature, but the day is not far off when FMC will play a major role in the way many people work," said Brian Kotlyar, research associate in Yankee Group's Enterprise Research group. "Integrating voice into mobile applications will be the new frontier for FMC. This will enable true differentiation between the FMC offerings of today that revolve exclusively around voice and the FMC applications of tomorrow that will enrich mobile data and increase Anywhere Enterprise™ productivity."

According to Telecommunications online (worth reading), During its short lifespan fixed-mobile convergence has gone from the greatest idea since bread was sliced to overhyped nonsense that will never happen. Along the way, it has still managed to maintain a small degree of respectability and potential.

From a report by MCF Corporation:

As deployment of 3G networks continues to grow, applications built for mobile entertainment should become more ubiquitous. According to Juniper Research, the value of the mobile entertainment market, including music, games, TV, sports and infotainment, gambling and adult content, could increase to nearly $77 billion by 2011 from $17.3 billion in 2006. Included in this forecast is the 50.2% CAGR of the mobile game
market by 2009 (to $10.9 billion from $3.1 billion in 2006). While one could argue the potential size of the mobile entertainment market, we believe that the transition to data has begun in an effort to reduce churn rates, preserve ARPU, and extend carrier brands.


The following highlights a few of the drivers:

Mobile entertainment and content. As deployment of 3G networks continues to grow, applications built for mobile entertainment should become more ubiquitous. According to Juniper Research, the value of the mobile entertainment market, including music, games, TV, sports and infotainment, gambling and adult content, could increase to nearly $77 billion by 2011 from $17.3 billion in 2006. Included in this forecast is the 50.2% CAGR of the mobile game market by 2009 (to $10.9 billion from $3.1 billion in 2006). While one could argue the potential size of the mobile entertainment market, we believe that the transition to data has begun in an effort to reduce churn rates, preserve ARPU, and extend carrier brands.

Location-based services (LBS): LBS is quickly emerging as a benchmark for service differentiation among mobile operators. According to ABI Research, GPS penetration in handsets could reach 1 billion by 2010 while Berg Insight projects 83% LBS growth in Europe, reaching a €5 billion market by 2010. We continue to expect LBS to be utilized for navigation, management/ tracking of assets, information (for example, mobile yellow pages) and emergency services. We are initially focusing on companies that offer machine-to-machine (M2M) applications which allow enterprises and consumers the ability to monitor and manage many types of assets (industrial vehicles, rental car fleets, real estate) in an effort to reduce costs and more efficiently operate.

Converged mobile devices, applications and services: According to IDC, the worldwide market for converged mobile devices increased 42% during 2006, reaching 80.5 million units, and is expected to cumulatively reach more than 1 billion units by 2011. Growth in shipments is primarily due to a greater selection of devices from which to choose and lower price points as mobile carriers look to differentiate their services. Many of these devices offer multiple features such as embedded cameras, MP3 players, GPS capability, and expended memory slots which allow subscribers the ability to carry only one device. We view the introduction of devices such as the iPhone as driving wireless data usage.

At the end of 1Q07, there were 2.8 billion wireless subscribers worldwide,
of which approximately 6%, or 172 million, were 3G subscribers. The 24% CAGR of total subscribers during the past four years has been driven by the rapid deployment of networks, availability and affordability of handsets, along with the introduction of new 3G services. We estimate 3G subscribers will grow at a 55% CAGR through 2010, reaching 652 million (approximately 14%) total estimated subscribers. We believe that wireless technology allows enterprises to become more efficient operators due to the lower costs to deploy and operate, comparable capacity to wireline solutions, increased functionality and productivity, and ability to track personnel and assets.

The chart above illustrates how data ARPU has stabilized total ARPU for AT&T Wireless/Cingular ($48-50 range), which has more than 62 million subscribers. AT&T currently reports approximately 33 million data customers (up more than 30% Y/Y) the growth of which has begun to reflect wider usage of its new 3G UMTS/HSDPA network (current coverage in 165 cities and is on schedule to cover virtually all of the top 100 U.S. markets by the end of 2007). The trend of wireless data
growth offsetting decreases in total ARPU is clearly evident below and is occurring throughout the industry.

MBMS but no Multicast

From the discussions going on in the industry, it seems that MBMS is being implemented by everyone but no one is concentrating on Multicast. This means we should now change MBMS to MBS but ofcourse it doesnt sound as good ;).

In the discussions going in RAN5 on the testing side, Nokia, Qualcomm and Ericsson has indicated that they are not interested in Multicast at the meoment (and probably for long time) and Mobile TV using MBMS will only be using Broadcast services.

The main reason for Multicast not being implemented is that it is quite complex and the purpose it was designed to serve can be served by using authentication at the Application Layer which i think is far enough.

Frankly if operators are really interested in utilising the potential of MBMS (excluding Mobile TV) then they will have to use Multicast sooner or later.

Can anyone think of why Multicast would be better than application layer security?

IMS Updates

Ericsson and Vodafone launched an IMS network in Czech republic this week. Under an agreement signed earlier this year, Ericsson was responsible for delivery and systems integration of its advanced IMS solution, along with project management, network design and implementation. With Ericsson's IMS solution, Vodafone Czech Republic can offer a wide range of next-generation IP telephony and multimedia services towards both fixed and mobile users. It said IMS is an important step towards fixed-mobile convergence. The international-standards-based technology is highly scalable, takes care of connection control, and ensures service quality as well as network and service security.

Aricent, a full-service, full-spectrum communications Software Company, announced this week that it has joined the IMS Forum, the industry's only forum dedicated to the acceleration of IP Multimedia Subsystem (IMS) application and service interoperability. Aricent has a dedicated IMS practice, with more than 800 person years of experience, offering an extensive portfolio of IMS software services and products. The services range from initial strategy and design, through software implementation to system integration and testing for the entire IMS architecture. These services accelerate time-to-revenue for Aricent clients and reduce their risks when deploying IMS-based solutions. With a comprehensive portfolio of IMS software services and products Aricent enables communications equipment manufacturers, device manufacturers and service providers to significantly reduce their time–to-market and mitigate the risks associated with IMS migration and roll-out.

Meanwhile, The IMS Forum, the industry's only Forum delivering IMS services interoperability verification and certification, announced recently that they have signed an MOU with the International Multimedia Telecommunications Consortium (IMTC), an international alliance of companies working together to improve the customer experience and accelerate market adoption of content delivery and unified communications solutions through interoperability of products and services based on open standards. The IMS Forum focuses on interoperability at the IMS Applications and Services Layer across mobile, fixed and cable broadband networks. The IMTC IMS Activity Group focuses on issues surrounding IMS Client interoperability, development and providing feedback to standards organizations.

Under the terms of the agreement, the IMS Forum and the IMTC will establish both a technical liaison between their Technical Working Groups and a marketing liaison. Through these liaisons the two groups will exchange technical information on IMS specifications, testing and interoperability, share interoperability testing best practices, collaborate on technical documents, and organize and participate in future joint testing events. The marketing liaison between the Marketing Working Groups will allow the organizations to share the results of their joint activities with the industry as well as promote this technology's adoption.

On Header Compression

Was doing some digging into pre-ROHC compression techniques and here they are:

Van Jacobson header compression (VJHC) (RFC 1144) is based on delta coding. The differences between two packet headers are referred to as the “delta”. Instead of transmitting the entire header, VJHC transmits only the delta. This approach achieves high compression. On the downside, it introduces vulnerability. If only one delta coded header is corrupted, all the following packets are erroneous. To recover from these errors and re–establish the current base header, VJHC sends all TCP re–transmissions uncompressed. Thus, VJHC does not require any signaling between compressor and decompressor. The disadvantage is the sensitivity to error–prone links. The Van Jacobson compression scheme was developed to increase the performance of IP/TCP flows over low bandwidth links such as PSTN. It does not even support compression of IP/UDP flows since at that time UDP traffic was very low. This scheme uses delta compression, sending only the difference in the value of the changing fields, to minimize the number of bits sent. It achieves compression from 40 bytes to on an average 4 bytes. It relies on the TCP recovery mechanism to recover from errors in the context due to bit errors and residual errors due to packet loss on the link. This scheme is obviously unsuitable for wireless links and multimedia applications.

Robustness at the cost of less compression was introduced by Perkins and Mutka. In “Dependency Removal for Transport Protocol Header Compression over Noisy Channels,” The delta–coding for the adjacent packets has been replaced by a reference frame. Several consecutive packets are aggregated to a frame. The first packet of a frame is sent uncompressed and the following packets use delta coding with respect to the first (uncompressed) packet in the frame. Clearly, the differences to packets at the end of a frame are larger than for those at the beginning. The compression gain is thus limited (and lower than for VJHC). The advantage of this approach is the usage of shorter delta coding ranges. Corrupted packets do not necessarily lead to the loss of synchronization. This is a clear advantage over VJHC.

IP Header Compression (IPHC) provides a number of extensions to VJHC. The most important extensions are support for UDP, IPv6, and additional TCP features (RFC 2507). With the explicit support of UDP come additional features, such as multicast. Nevertheless, support for RTP is still not given which makes the scheme unsuitable for many multimedia applications. Similar to VJHC, IPHC relies on the change of header fields as well as on the derivation of header field contents. The encoding also employs the delta–scheme, transmitting only the changes in the header fields.

The Compressed Real Time Protocol (CRTP) scheme presented in RFC2508 compresses the 40 bytes header of IP to 4 bytes if the UDP checksum is enabled, or to 2 bytes if it is not. This is possible by compressing the RTP/UDP/IP headers together, similar to the VJHC approach. With the characteristics of the RTP protocol, the changes for the RTP header fields become partially predictable. In addition, changes in some fields are constant over long periods of time. Thus, the expected change in these fields can be implied without even transmitting the differences. These implied fields are also referred to as first order changes. They are stored with the general context for each specific connection. The differences within fields that have to be compressed are referred to as second order differences. An example for these are video frame skips. Video frames are generally transmitted every 40 ms. In case a frame cannot be encoded (e.g., due to lack of processing power or because of a slower play-out ratio), the implied time no longer is accurate. Therefore, the new first order is set to the second order and the connection context is updated. CRTP cannot use a repair mechanism as VJHC does because UDP/RTP are unidirectional protocols without retransmissions.

RObust Checksum–based COmpression (ROCCO) is a refinement of CRTP. ROCCO includes a checksum over the original (uncompressed) header in the compressed header. The checksum facilitates local recovery of the synchronization. In addition, ROCCO incorporates compression profiles (tailored for specific applications, e.g., audio or video streaming) and has a code with hints on the change of header fields in the compressed header. These mechanisms improve the header compression performance, especially for highly error–prone links and long round trip times

MBMS battle heats up

The MBMS battle has started heating up with new developments and announcements nearly every week.

First of all there was this announcement from ZTE, China

China's ZTE Corp. announced that it has, in collaboration with Qualcomm, successfully completed a Multimedia Broadcast Multicast Service (MBMS) testing based on the 3GPP R6 standard conducted at its Shanghai R&D center last month.

The first testing MBMS inter-operability test (IOT) completed, test results show that 128- and 256Kbps high-speed transmission of MBMS TV programs broadcast and multicast services can be smoothly delivered over cellular networks. The success of MBMS IOT marks the readiness of commercial delivery to the mass market.

"Qualcomm is happy to cooperate with ZTE in conducting the MBMS testing, an area which we believe is part of the core development of ZTE's W-CDMA products," said Frank Meng, president of Qualcomm Greater China. "This is a major contribution in the development of MBMS and we are confident that the results of the testing will help our customers provide more competitive W-CDMA products and solutions moving forward."

Then yesterday, Anite submitted first MBMS Conformance Test which they were able to pass on Nokia NoRM-6 and Qualcomm 7200 UE. Other System Simulator manufacturers are not far behind with Anritsu and R&S also focussing heavily on MBMS test cases development.



Anritsu Protocol Test System (PTS) is shown in the figure above.

At present it seems Nokia and Qualcomm are leading the way on the UE side but in past i have heard about Ericsson and Motorola being MBMS ready soon.

ROHC, compressing IP headers over air interface

In an All-IP network, when IP packets are transmitted over the air, it would make more sense to strip down the headers as headers could be as big as the data being transmitted and these headers are overhead wasting the precious air resource. To help compress these headers, RObust Header Compression was standardised. Infact ROHC is not the only header compression scheme and i will post a bit more information in my future posts on which scehemes are available and why ROHC is used.

The diagram above shows the basic ROHC principle. It shows that ROHC compresseor is used before the data is sent over the air and decompressor at the receiving end adds the uncompressed headers back to the received packets. As expected, ROHC only works if both the ends have ROHC protocol.

A typical header compression is shown in the diagram above.

More information is available at the 3G4G website.

Back to work

Had been enjoying the sun in sunny Istanbul for a week now and back to work to find over 200 mails in my different Inboxes. Will take some time for me to get back to the routine.

By the way, the photo is taken just outside Blue Mosque (known as Sultanahmet).

More on Continuous Packet Connectivity (CPC)

Just realised that CPC is becoming more important with the Network Operators and UE manufacturers because it can allow more UE's to be ready for transmitting data. In my earlier post i had given some details about CPC.

Before i could begin writing some more details on CPC, i came across Martin's Blog which have excellent information on this topic. So i have listed them down here:

Continuous Packet Connectivity (CPC) Is Not Sexy - Part 1

Continuous Packet Connectivity (CPC) Is Not Sexy - Part 2

Continuous Packet Connectivity (CPC) Is Not Sexy - Part 3

There might be a part 3 coming soon, which will make life simpler for people like . Any additional information in form of comments most welcome.

Added on the 14th of Jan 2009.
Part 3 has now added to the same post...