Telecommunications Blog

  Both are 4G technologies designed to move data rather than voice. Both are IP networks based on OFDM (Orthogonal Frequency Division Multiplexing) technology.

   WiMax is based on a IEEE standard (802.16),Depending on the spectrum alloted for WiMax deployments and how the network is configured, this can mean a WiMax network is cheaper to build.

     WiMAX offers peak wireless data speeds of up to 60 Mbps on the downstream and 25 Mbps for sending data upstream.

    Long Term Evolution (LTE), can ferry data to you at download speeds of 100 Mbps and support upload speeds of 50 Mbps.

    That means you can download about two 5-minute MP3 files every second. Think about that. Sure, it would only take WiMAX about seven minutes to download a single 5-minute MP3 file, which is still fast, but it’s nowhere near the theoretical scale of LTE.

7th LTE World summit is schedule on 17-18 May 2011 at Amsterdam RAI.




Features of this event will be :

Now in its 7th Year! This is THE LTE event of the year!

• 2500+ Attendees from 100+ countries
• 150+ High-level speakers
• 120+ Exhibitors, meeting rooms & hospitality suites
• 100+ Operator Case Studies
• 50%+ Director-level and above attendance - meet the decision makers here!

   Intel may be attempting to secure a spot for their mobile chips by first infiltrating the Chinese phone market. Their sources claim that Intel has submitted designs of a handset based on a version of Intel’s Atom microprocessor. The phone will be manufactured by ZTE Corp and may go on sale in China. 

   
     Intel is trying to offer its processors for the smartphone manufacture but till now we haven’t seen any gadget with Intel processor. It is fact that Intel processors are very commonly available

SC-FDMA (Single Carrier Freq Domain Multiple Access) used in Up-Link in LTE.

    o The system uses SC-FDMA as uplink multiple access method instead OFDMA to decrease the PAPR and power requirements.

    o It offers the same degree of multipath mitigation but because the transmission is
on single carrier PAPR is lower.


     o The basic idea is to add cyclic prefix to the mapped symbols and in the receiver
multipath distortion can be handled by the same method as OFDM (carrier based equalization).

   Following Tuesday’s release of the JAJAH App for Android, JAJAH Facebook Calls for iPhone beta released for iPhone Free Calls From iPhones to Any Facebook Friend. It's available in the US and Canada now.

To make a Facebook Call:

• Download the JAJAH App for iPhone from iTunes
• Connect to Facebook
• Select a friend from the “online friends” list
• They will receive a message within Facebook chat advising of the call. Once they accept,

   LTE technology supports manufacturer’s rated peak download speeds of up to 150 megabits per second (Mbps) and upload speeds of up to 70 Mbps.

   Canadian operator TELUS has announced the plan to launch of LTE network 1st H 2012. Following field testing in 2011 and the completion of an RFP process currently underway, construction on TELUS' LTE network will begin in the latter half of 2011 in major urban markets across Canada. 

   Telus – the country’s third-largest operator – said that construction of the new network will begin in the latter half of 2011 in “major urban markets” across Canada. It will initially operate on

   Virginia-based nTelos Wireless and Alcatel-Lucent have accomplished an end-to-end Long Term Evolution (LTE) field trial in Waynesboro, Va.

   “This trial enables us to make informed decisions on how to smoothly evolve our network and incorporate 4G LTE into the existing infrastructure, particularly in terms of end-user performance, throughput, latency and Quality of Experience,” said Bobby McAvoy, Senior Vice President, Wireless Engineering & Operations for nTelos Wireless.

   For this trial, Alcatel-Lucent provided an end-to-end integrated solution including 4G LTE base

    Infrax Systems, Inc. (OTCBB: IFXY), a global provider of unified Smart Grid-related products and services for the Energy and Utility industries, today announced the availability of a new upgradeable WiMAX/LTE base station. This new base station option allows network operators and service providers to utilize the desirable 1.4-1.6 GHz frequencies. The addition of these new base stations will provide operators of rural broadband networks better range than the typical 2.5 or 3.5 GHz WiMAX. These new base stations also have the capability of being upgraded from WiMAX (802.16e) to Long Term Evolution (LTE) via firmware. These modular 4G base stations can even provide the ability to change to a different frequency by changing radio modules to provide more longevity of the platform and protect network operator's investments.

   The American Reinvestment and Recovery Act appropriated $7.2 billion for the Department of Agriculture’s Rural Utilities Service (RUS) and the Department of Commerce’s National

   China Mobile has selected Ericsson to participate in the world’s largest TD-LTE trial network deployment to date. With the approval of the Chinese Ministry of Industry and Information Technology (MIIT), Ericsson will build trial network in the city of Shenzhen.

   The approval by MIIT follows the successful completion of interoperability tests of Ericsson's TD-LTE network equipment with multiple chipset manufacturers. As part of its efforts to further develop the global ecosystem, Ericsson is proactively conducting interoperability tests with leading international players such as ST-Ericsson and Qualcomm.

  "China Mobile has always been a formidable force in driving the evolution of telecommunications technologies. As a longtime strategic partner to China Mobile, Ericsson will fully support our customer in its tremendous endeavor to make TD-LTE a reality in the

   Epitiro has completed the independent speed, latency and voice quality-of-experience analysis on a commercially available LTE network. Tests recorded peak broadband download speeds of 48Mbps (36.1Mbps mean) where as Mean latency was just 23ms.

  Epitiro, at the same time, tested TeliaSonera's legacy 3G network; LTE delivered mean download speeds nine times faster, and its latency was five times faster. Analysis of IP calls to the UK, made using voice over LTE (VoLTE), found the quality to be ‘excellent’ on average with only 1 call in 298 being of inferior quality.

  “Based on our observations, this LTE rollout is directly comparable to high-speed fixed

LTE PHY layer block diagram:-

We can implement LTE Physical layer Block diagram in Matlab .



Frame structure: it is FDD frame which is 10ms divided into 10 subframes each
of 1ms & each subframe is divided into 2 slots of 0.5 ms which carry 6 or 7 OFDM
symbol.

EPS to EPC

   A key feature of the EPS is the separation of the network entity that performs control-plane functionality (MME) from the network entity that performs bearer-plane functionality (SGW) with a well defined open interface between them (S11).


LTE S11: -

    An IP interface between MME and SGW! GTPv2 is the protocols used at the application

What is LTE?

    3GPP LTE (Long Term Evolution) is the name given to a project that aims to improve the
UMTS mobile phone and it is not a standard but it will result in the release 8 of UMTS
and it can be considered the real 3.9G & invited to join the 4G family.

Technical specifications:-


LTE PHY layer block diagram:-

    If an adversary knows certain information (IMSI, IMEI, MSISDN) about the subscriber or a mobile phone, he can then identify individual phone calls, although this does require extensive technical effort.

    With the aid of IMEI it is possible to selectively filter calls out from the datastream on the mobile network radio relay links. Calls can also be identified in the public telephone landline network, for which knowledge of the subscriber call number is necessary. With the appropriate interception equipment, the IMSI and IMEI can be ascertained directly on the radio link between mobile phone and base station.

     The SIM card can be protected against unauthorised access with a four- to eight-digit Personal Identification Number ( PIN). After switching on the mobile phone, the subscriber identifies himself to the card by entering this PIN. If an unauthorised person gains possession of a SIM card, he cannot use it without also knowing the PIN. To prevent improper use of the SIM card, the PIN should therefore be kept in safe place.

      The subscriber identifies himself to the network provider on registering by means of the SIM card and the cryptographic algorithms held on it. Authentication is effected with the aid of an authentication key which is known only to the network provider in the AUC and the subscriber on the SIM card.

     Normally the data is only transmitted encrypted on the radio link between the mobile phone and the base station. Encryption is not used on any of the other transmission paths, either in the

   Samsung Galaxy Tab 10.1 3G tablet with no GSM voice communication capabilities.
   It supports GSM 850 / 900 / 1800 / 1900 & HSDPA 850 / 900 / 1900 / 2100 and Wi-Fi 802.11 a/b/g/n, Wi-Fi hotspot .It has been Announced in March 2011 .

   It will be release in June 2011.Its dimensions are 256.6 x 172.9 x 8.6 mm .Its weight is 595 g
The display type is TFT capacitive touchscreen, 16M colors and support :

     AT&T and Verizon iPhone 4 owners are more than twice as likely to report dropped calls than Verizon customers, says survey .

    Taken from a group of 4,068 people, the survey's results show 82 percent of Verizon subscribers being "very satisfied" versus 80 percent for AT&T. Those results are similar to an industry-wide, non-iPhone-specific poll conducted separately by ChangeWave. In that poll, 4.6 percent of AT&T subscribers reported dropped calls, compared with 1.4 percent of Verizon customers.
    The figures stand in contrast with quality of service however, specifically in terms of dropped calls.

   Sony chief Sir Howard Stringer may have unintentionally given away plans for an eight-megapixel camera in the iPhone 5. During an interview with the WSJ's Walt Mossberg, he claimed that the company's camera sensor plant in Sendai had seen hit by the Japanese earthquake and that shipments of sensors to Apple would be delayed. Apple has so far only sourced cameras from OmniVision, suggesting that Sony was shipping for a future model.


    Apple might have been eying Sony's new Exmor R camera sensors, as found in the Sony Ericsson Xperia arc , and the recently announced Xperia neo. The 8MP camera sensor there is backlit, which helps it cope with low light situations, similar to what the current 5MP OmniVision

SS7 Protocol :


     The primary signaling protocol in use today is signaling systems 7(SS7), which interconnects networks such as SSP, SCP .

     The SS7 Protocol stak consist in several individual protocols, including Message Transfer Part (MTP) level1,2 and 3, Integrated services Digital Network User Part, Signaling Connection Control Part (SCCP), and the Transmission Capabilities Application Part (TCAP) working together, these protocols define the format for all SS7 messages, as well as the procedures by which messages are generated and processed.
    

    The IEEE Standards Association has given its seal of approval to the next generation WiMAX standard, dubbed 802.16m. The new standard supports a “wide range of data rates in multiple user environments” and has a theoretical maximum throughput of around 300Mbps.



     ” The standards group notes that 802.16m will provide the speed and performance necessary to support future advanced services and applications for next generation broadband mobile communications.”  said Dr. Roger Marks, Chairman of the 802.16 Working Group.