Prisoners need mobiles too :)

Looks like there is a worldwide problem of Mobiles in the jails. Nearly everywhere mobiles are illegal in jails but people somehow manage to sneak them in.

First, this news from India about an inmate found with a mobile inside the prison. Apparently these phones are used by inmates to create co-ordinated attacks, etc. Sneaking a mobile in India is probably not too difficult because you bribe the policeman and he will get one for you ;)

In Brazil, it difficult to probably get a phone by bribing the policemen. That is why the prisoners have to ask someone to send mobiles using pigeons as carriers. Pigeons are carrying parts of mobiles which are being used by the inmates to assemble and create working mobiles. Maybe they can fix my old Nokia 6280 as well. Unfortunately couple of pigeons were recently caught and thats how authorities found out about them.

The Australian authorities in New South Wales have already passed a law stating that if someone is found smuggling mobiles in prison then they will face 2 years jail and $2200 fine. They are training dogs to sniff out mobiles.

In India a member of public (normal human being like most of us) has demanded that 'rude' mobile users should go to prison:

A petition filed by Gurjit Singh, a member of the public, demands that carrying mobiles at funerals and temples should be made illegal and the installation of mobile phone jammers on school buildings to block students from making calls mandatory.

Mr Singh also wants phone companies to roll-out apparatus would disable mobiles on the roads to avoid traffic accidents, and a law under which civil servants could be imprisoned if they make personal calls on their handsets during office hours.

His final demand is that mobile phones fitted with cameras be outlawed “for the safety of women”.

The measures may appear extreme, but have already won significant backing, including from The Times of India, the country’s most-read English language newspaper. “Mobile phones have made us less considerate for each other,” it said.

The newspaper went on to admit – somewhat ruefully – that banning mobile phones outright was not an option, but added: “The problem will only get worse, unless the parliamentary panel’s observations are taken seriously.”

India’s mobile phone market is one of the few corners of the global economy to have remained impervious – so far – to the effects of the credit crunch. In January, the country added a record 15 million subscribers, making it the world’s fastest growing, with customers from the country's poor rural areas driving the surge.

The industry's success has a dark side, however: in cinema theatres across India audience members can often be heard chatting on their new handsets, discussing the plot of the film as it unfolds on screen.

While even doctors commonly answer calls while treating patients.

The problem is made worse as the phone companies force as many conversations as possible through a limited amount of infrastructure, a cost-cutting measure that executives privately admit lessens the clarity of calls and means users often have to shout to make themselves heard.

There are, however, doubts over whether tough new penalties would work, especially when laws banning other public nuisances such as spitting have failed. A spokesman for RCom, India’s fastest growing mobile provider, insisted that while the industry takes the etiquette issue seriously there is a limit to what it can do. “This is really a matter of personal responsibility,” he said.

My solution for the Indian government is that mobiles should be allowed only in prisons :-)

ICE: In case of emergency

In case of emergency (ICE) is a program that enables first responders, such as paramedics, firefighters, and police officers, to identify victims and contact their next of kin to obtain important medical information. The program was conceived in the mid-2000s and promoted by British paramedic Bob Brotchie in May 2005. It encourages people to enter emergency contacts in their cell phone address book under the name "ICE". Alternately, a person can list multiple emergency contacts as "ICE1", "ICE2", etc. The popularity of the program has spread across Europe and Australia, and has started to grow into North America.

Implementation of CQI Reporting in HSPA

In HSDPA the channel quality indicator is a measure of the mobile channel which is send regularly from the UE to the Node B. These measurements are used to adapt modulation and coding for the corresponding UE and it can be also used for the scheduling algorithms.

The CQI measurement is implemented in the HSPA module and the measurement interval as well as the influence of measurement errors can be parameterised. The results can be given in form of maps or in a statistical manner as histogram for each cell.

Information about the instantaneous channel quality at the UE is typically obtained through a 5-bit Channel-Quality Indicator (CQI) in HS-SCCH, which each UE feed back to the NodeB at regular intervals. The CQI is calculated at the UE based on the signal-to-noise ratio of the received common pilot. Instead of expressing the CQI as a received signal quality, the CQI is expressed as a recommended transport-block size, taking into account also the receiver performance.

The reason for not reporting an explicit channel-quality measure is that different UEs might support different data rates in identical environments, depending on the exact receiver implementation. By reporting the data rate rather than an explicit channel-quality measure, the fact that a UE has a relatively better receiver can be utilized to provide better service (higher data rates) to such a UE. It is interesting to note that this provides a benefit with advanced receiver structures for the end user.

This is appropriate as the quantity of relevance is the instantaneous data rate a terminal can support rather than the channel quality alone. Hence, a terminal with a more advanced receiver, being able to receive data at a higher rate at the same channel quality, will report a larger CQI than a terminal with a less advanced receiver, all other conditions being identical.

Each 5-bit CQI value corresponds to a given transport-block size, modulation scheme, and number of channelization codes. Different tables are used for different UE categories as a UE shall not report a CQI exceeding its capabilities. For example, a UE only supporting 5 codes shall not report a CQI corresponding to 15 codes, while a 15-code UE may do so. Therefore, power

offsets are used for channel qualities exceeding the UE capabilities. A power offset of x dB indicates that the UE can receive a certain transport-block size, but at x dB lower transmission power than the CQI report was based upon. UEs belonging to category 1–6 can only receive up to 5 HS-DSCH channelization codes and therefore must use a power offset for the highest CQI values, while category 10 UEs are able to receive up to 15 codes.

The CQI values listed are sorted in ascending order and the UE shall report the highest CQI for which transmission with parameters corresponding to the CQI result in a block error probability not exceeding 10%.

Specifying which interval the CQI relates to allows the NodeB to track changes in the channel quality between the CQI reports by using the power control commands for the associated downlink (F-) DPCH. The rate of the channel-quality reporting is configurable in the range of one report per 2–160 ms. The CQI reporting can also be switched off completely.

In addition to the instantaneous channel quality, the scheduler implementation in the NodeB should typically also take buffer status and priority levels into account before finalising the data rate for the UE. Obviously UEs for which there is no data awaiting transmission should not be scheduled. There could also be data that is important to transmit within a certain maximum delay, regardless of the channel conditions. One important example hereof is RRC signalling, for example, related to cell change in order to support mobility, which should be delivered to the UE as soon as possible. Another example, although not as time critical as RRC signalling, is streaming services, which has an upper limit on the acceptable delay of a packet to ensure a constant average data rate. To support priority handling in the scheduling decision, a set of priority queues is defined into which the data is inserted according to the priority of the data. The scheduler selects data from these priority queues for transmission based on the channel conditions, the priority of the queue, and any other relevant information.

LTE UE Categories

Five different UE categories have been defined for LTE. These UE categories are often referred to as UE classes. As can be seen in the table above, the low end UE does not support MIMO but the high end UE will support 4x4 MIMO. It is also worth noting that UE class 1 would be inferior to that of the best HSPA UE. It is important to note that regardless of whatever category a UE belongs to, it has to be capable of receiving transmissions from upto four antenna ports. This is because the system information can be transmitted on upto four antenna ports.

It should be noted that some of the capabilities are outside the UE category info. For example the Inter-RAT capabilities like the support of EV-DO or GSM, etc is not specified as part of the UE categories. Similarly the support of duplexing schemes and the support of UE-specific reference signals are outside the scope of this.

Reference:3GPP TS 36.306 - E-UTRA User Equipment (UE) radio access capabilities

Orange to launch Exposure2

Orange this week launches Exposure 2, the second Exposure research survey commissioned to reveal the role of mobile media usage within the broader media landscape. Exposure 2 consists of independent qualitative and quantitative research, following a survey of more than 2,000 mobile media users from across all UK mobile networks. The survey focuses on consumer consumption of mobile media, and attitudes towards it when used as a marketing channel - particularly in comparison to other traditional and digital media.

Key Findings

Mobile Media Consumption

A mobile media user for the Exposure2 study is anyone who has used their mobile handset to do one of the following:

• Watch Mobile TV
• Use the mobile internet
• Use Bluetooth
• Send & receive mobile videos / MMS
• Send & receive pictures / MMS
• Send & receive emails
• Search the internet
• Play games
• Listen to the radio
• Listen to music
• Find local information
• Download wallpapers/pictures
• Download screen logos
• Download ringtones
• Download music
• Download games

Mobile media usage patterns differ greatly depending on a consumers location, with the strongest usage of mobile media being in the home: 67% of participants who used their mobile for email did so in their home and 56% for mobile internet browsing. Downloading, mobile content was also revealed as significantly more likely to be performed at home, with speed, convenience and alleviating boredom, cited as the key reasons for usage.

Meanwhile, high use of mobile media on public transport centred around entertainment services, such as TV, music and games, whereas services used most when out and about, such as local information and internet search, tend to facilitate movement.

Other key findings on mobile media usage included:

• The average age for mobile media users is 36, and 81% use mobile media more than once a week with 46% using it daily
• Men generally use mobile media more, although women are much more likely to use picture messaging
• The mobile internet pages viewed most often are search engines, email, news, music and film although, interestingly, a high proportion (55%) of people browse the mobile internet with no specific agenda, providing an opportunity for marketers to attract their attention

Attitudes to Mobile Media as a Marketing Channel

Research participants were asked to rate traditional and digital broadcast and print media on a number of attributes. Mobile media was overwhelmingly viewed as the most personal and innovative media, providing it with a unique place in the marketing mix.

The research revealed that people are very much open to mobile marketing and contained some important insights for brands looking to engage with consumers using the media:

• Short SMS codes remain a popular marketing mechanic, having been used by two-thirds of participants
• 70% of participants are attracted more by interactive marketing formats, such as sponsorship, coupons or picture messaging mechanics
• In general, consumers viewed marketing formats with perceived value as the most appealing, such as coupons offering discounts and sponsored games available for free download
• When clicking on adverts on the mobile internet, the next stages which are most popular are: adverts which click straight through to the brand’s website (favoured by 47%); voucher code or coupon (43%); click through to another area of the site (36%); entered in a competition (34%)
• Icons letting users know what to expect from mobile advertising were received positively by 76% of participants
• 82% of respondents have the operator’s portal as their mobile internet home page, making this page an extremely valuable piece of marketing estate

Steve Heald said: “Exposure 2 provides some terrific insights into how exactly brands can go about engaging consumers through mobile. The public is looking for campaigns that reflect their perceptions of mobile as unique and innovative and that entices and excites them with clever interaction. There’s also a clear signal that brands need to be clear on what consumers can expect from mobile campaigns.”

Difference between SDU and PDU

This question keeps propping up in many discussions so here is an explanation for the difference between PDU and SDU.




Going back to the basics, a protocol stack consists of many different individual protocols. Protocols can be simply described as set of rules that allow communication between peer entities or they can also be described as set of rules that facilitate horizontal communication. Now these protocols are arranged in layers as can be seen in the figure above. In the transmitter side, a layer N receives data from layer N+1 and this data is called the SDU or Service Data Unit. This layer will modify the data and convert it into a PDU or a Protocol Data Unit. The peer entity in the receiver is only able to understand this PDU.

In simplest form, this modification by layer N of the layer N+1 SDU contains encapsulation. In encapsulation, the SDU is preserved as it is and an additional header is added by the layer N protocol. The modification can also perform concatenation (where more than one SDU is combined in a single PDU), segmentation (where a SDU can be split so that different parts of it end up in different PDU) and padding (where SDU is so small that filler bits are added in the end to complete the PDU).

In the receiver side, the peer entity receives the PDU from layer N-1 (its actually layer N-1 SDU) and convert it back into SDU(s) and passes it to layer N+1.

The figure above shows an example of RLC SDU and PDU. The SDU's are received from higher layer, which is from PDCP in case of LTE. These SDU's have to be converted to PDU's so they undergo segmentation and concatenation and suitable RLC headers are added to form the RLC PDU's.

First Figure Source: The TCP/IP Guide

Second Figure Source: 3G Evolution - HSPA and LTE for Mobile Broadband, Erik Dahlman et al.

Bankrupt Nortel pays hefty bonuses to executives

Nortel Networks, as it continues to wade through bankruptcy protection, posted a $2.14 billion loss in the fourth quarter and a $5.8 billion loss for all of 2008.

The above news obviously paints picture where the restructuring and job losses will be normal activity at Nortel. However the news which I got to read today and which is not at all normal is that Nortel is going to pay $7.3 million as a bonuses to it’s executives.

This is quite extraordinary for me specially when employees at the bankrupt company were forced to decide between severance pay and their pension plans.

An Ontario Superior Court Judge Geoffrey Morawetz has allowed Nortel Networks Corp. to pay these bonuses to some Canadian senior executives as part of an incentive plan to keep them with the company to drive reorganization as it tries to emerge from bankruptcy protection.Earlier this month, a U.S. court overseeing Nortel's bankruptcy allowed the company to pay $22 million in bonuses the company said it needed to keep 880 employees worldwide.

All the amounts mentioned above do not include any payments to CEO Mike Zafirovski. This becomes quite apparent that whatever compensation Zafirovski receives will come from a separate pot.

It’s reported that under the terms of the key executive incentive plan, the top executives could get cash incentives of 100 per cent to 183 per cent of base salaries where the salaries are thought to in the $1-million U.S. annual range.

These new payments in terms of bonuses has not gone down well and there are vociferous protests specially from a lawyer representing a group of Nortel workers who have been fired but have not received severance pay.

For me this situation is like there is a guy who refuses to pay his debts but then spends £10,000 for a car. These are tough times and it should apply fairly to everybody.

Nortel has offered to give fired employees early access to pension plans and provide medical benefits to retirees under the condition that they drop their claims for severance pay in bankruptcy court.

The telecom equipment giant filed for bankruptcy protection in mid-January and has until May to restructure. Since filing the bankruptcy, Nortel’s revenue declined 15 percent year-over-year in the fourth quarter, down to $2.72 billion.

As a part of restructuring process Nortel may offload some of its major units, including its wireless equipment business, instead of trying to remain a whole company.

Recession is affecting Mobile giants big time.

In November 2008, Nokia cut 600 jobs in Finland, Britain, the United States, and Singapore. According to its final quarter trading statement of last year, Nokia’s operating profits slumped 80% to €492m on the back of a 19 per cent fall in sales to €12.7bn.

As a result, Nokia is cutting another 1,700 jobs around the world, including an undisclosed number in the UK and China. The handset group plans to shed staff across its divisions, including sales and marketing, research and development and its corporate offices. Nokia, which runs UK offices in London, Farnborough and Cambridge, said it was determined to cut costs to weather the recession.

In China, the company has put forward a voluntary resignation plan in February 2009, encouraging employees to resign on a voluntary basis. It was learned that Nokia China would make termination payments to the first 1,000 employees who are willing to resign between March 1 and May 31, 2009. The company says it hopes to reduce human resource costs and avoid involuntary redundancy through this measure. In addition, Nokia is also encouraging its staff to take unpaid leave this year.

Last week, Sony Ericsson plunged the mobile phone industry into crisis , issuing a disastrous profits warning as it revealed that it expected the world to buy 10 per cent fewer handsets this year. This quarter, it is expected to ship about 14 million mobile phones, for sale at, on average, €120 (£113) each. By contrast, it shipped 24.2 million phones at €121 in the previous three months. Sony Ericsson warned that weak demand from consumers, as well as destocking, meant it would lose up to €390m in the first three months of its financial year.

It will be the company's fourth consecutive quarterly loss. The company, which has already announced plans to cut 2,000 staff has so far refused to rule out further job losses. A spokeswoman said 1,000 employees have already left the business, with 1,000 more to follow soon in an attempt to achieve €300m in cost savings by the second-half of this year. However, at the end of January the company announced a further €180m cost-cutting drive, which "will have an additional impact on jobs". The business employs about 500 staff in the UK. One site in Manchester is already earmarked for closure.

Now, Vodafone, the mobile phone giant which is set to post profits of nearly £12bn for the year to March, has scrapped pay rises for all its 10,000 UK staff, ditched bonuses and told its sales reps to keep their cars for longer, as it attempts to trim £1bn from the firm's costs.

Less than one month after Vodafone said it was axing 500 jobs in Britain, a confidential email from Guy Laurence, the chief executive of the firm's UK business, was sent to everyone in Vodafone UK detailing the pay freeze, described by Laurence as a "tough decision to make, but a responsible one".

In the memo, Mr Laurence says: "If we had agreed to a salary rise it would have forced us to increase the number of redundancies in the recent announcement." Vodafone would be "asking company car drivers and those with job requirement cars to keep their cars for longer," he said.

Changes would also be made to "bonus plans for the next financial year", with the incorporation of new targets based on profit shares.

Vodafone said last month that job cuts at the telecoms group were necessary to allow it "to compete more effectively in the UK market". Retail staff were unaffected by the cuts, which largely fell on staff at the firm's Newbury headquarters, with 170 being made redundant.

By the way, According to Telegraph, Motorola, the fifth biggest player, is thought to be on the verge of bankruptcy.

Home e-NodeB Architecture in Release 8

The Architecture of Home e-NodeB's (popularly known as Femtocells) is as shown above.

The E-UTRAN architecture may deploy a Home eNB Gateway (HeNB GW) to allow the S1 interface between the HeNB and the EPC to scale to support a large number of HeNBs. The HeNB GW serves as a concentrator for the C-Plane, specifically the S1-MME interface. The S1-U interface from the HeNB may be terminated at the HeNB GW, or a direct logical U-Plane connection between HeNB and S-GW may be used.

At present there is no support X2 connectivity of HeNBs.

The S1 interface is defined as the interface:

• Between the HeNB GW and the Core Network,
• Between the HeNB and the HeNB GW,
• Between the HeNB and the Core Network,
• Between the eNB and the Core Network.

The HeNB GW appears to the MME as an eNB. The HeNB GW appears to the HeNB as an MME. The S1 interface between the HeNB and the EPC is the same whether the HeNB is connected to the EPC via a HeNB GW or not.

The HeNB GW shall connect to the EPC in a way that inbound and outbound mobility to cells served by the HeNB GW shall not necessarily require inter MME handovers.

The functions supported by the HeNB shall be the same as those supported by an eNB (with the possible exception of NNSF - NAS Node Selection Function) and the procedures run between a HeNB and the EPC shall be the same as those between an eNB and the EPC.

The HeNB hosts the same functions as an eNB, with the following additional specifications in case of connection to the HeNB GW:

• Discovery of a suitable Serving HeNB GW
• A HeNB shall only connect to a single HeNB GW at one time, namely no S1 Flex function shall be used at the HeNB in case of connection to the HeNB GW.
• If the HeNB is connected to a HeNB GW, it will not simultaneously connect to another HeNB GW, or another MME.
• The TAC and PLMN ID used by the HeNB shall also be supported by the HeNB GW.
• When the HeNB connects to a HeNB GW, selection of an MME at UE attachment is hosted by the HeNB GW instead of the HeNB;
• HeNBs may be deployed without network planning. A HeNB may be moved from one geographical area to another and therefore it may need to connect to different HeNB GWs depending on its location.

The HeNB GW hosts the following functions:

• Relaying UE-associated S1 application part messages between the MME serving the UE and the HeNB serving the UE;
• Terminating non-UE associated S1 application part procedures towards the HeNB and towards the MME. Note that when a HeNB GW is deployed, non-UE associated procedures shall be run between HeNBs and the HeNB GW and between the HeNB GW and the MME.
• Optionally terminating S1-U interface with the HeNB and with the SGW.
• Supporting TAC and PLMN ID used by the HeNB

In addition the MME hosts the following functions:

• Access control for UEs that are members of Closed Subscriber Groups (CSG).

Mechanisms for filtering of paging messages, in order to avoid paging message distribution to HeNBs belonging to CSGs where the UE is not registered, is FFS.

Source: 3GPP TS 36.300 - E-UTRA and E-UTRAN Overall description; Stage 2 (Release 8)

LTE: MIB and SIB transmission

One very interesting change that has been done is that in LTE the system information is not all transmitted on the same channel unlike UMTS/HSPA. Logically all BCH info is mapped on BCCH. On the transport channel side, the information is mapped either on BCH or DL-SCH. (DL-SCH = Downlink Shared Channel). Ofcourse they map onto different physical channels as can be seen in the diagram.

Once the UE has achieved synchronisation, it will read the MIB to camp on the cell. In LTE, MIB contains very limited information. It contains information about the cell bandwidth, some information about PHICH (Physical HARQ Indicator Channel) and the SFN.

The SIB's as I mentioned are transmitted on DL-SCH mapped on PDSCH. To receive information about SIB's the UE needs information about PHICH which is read from the MIB.

The BCH channel has a TTI of 40ms (which is quite a lot for LTE, if you think about it). Also it has very small transport block size and protected with 1/3 convolutional code and 16bit CRC.

All these help to keep the overhead in LTE system to minimum.