Hands-Only CPR: When and How to Do It

I’m frequently asked if giving breaths has been eliminated from CPR now that the CPR guidelines have been updated. The simple answer is no, the breaths are still instructed in traditional CPR classes. However, there has been a big push, especially by the American Heart Association, to teach a version of CPR without breaths. This approach is often called “hands-only CPR”.

In short, hands-only CPR is fast, deep compressions on a victim’s chest. If someone doesn’t respond to your efforts to wake them, and their breathing is irregular or they aren’t breathing, you push straight down on an adult’s chest at least 2 inches at a rate of at least 100 compressions a minute. This is a skill you need to practice with an instructor on a manikin, so I’m not going to go into further detail on how to perform this skill.

Hands-only CPR has many advantages over traditional CPR: it’s simple to do, it reduces the risk of disease   transmission  while doing CPR, and research shows it’s as effective or more effective when used appropriately.

Hands-only CPR is an acceptable approach when you witness someone suddenly collapse. If this is an adult, it’s probably because of cardiac arrest (a heart attack). The victim still has several minutes of oxygen in their blood because they were breathing moments before they collapsed. The goal of hands-only CPR is to circulate that oxygenated blood throughout their body. By continually compressing their chest, you are literally squeezing blood through their heart so it reaches the brain and organs. Those compressions will buy the victim valuable minutes until emergency medical personnel arrive.

However, hands-only CPR isn’t always the best approach. If the victim has become unconscious and isn’t breathing normally because of an airway emergency, they need CPR with breaths. Asthma, severe allergies, choking, drowning and suffocation are all examples of airway emergencies that can lead to a victim who is unconscious and not breathing normally. Because these victims are lacking oxygen, they need rescue breaths, along with chest compressions.

Children and infants usually have healthy, strong hearts so if they become unconscious, the cause is usually not cardiac related. Most likely they are suffering from an airway emergency. This is why every parent who takes a CPR class should learn to do CPR with breaths. Unless a CPR class says it’s a hand-only class, all American Red Cross and American Heart Association CPR classes will teach you how to give rescue breaths along with compressions.

Diflucan Yeast Infection

Yeast is a type of fungus that may be present normally over the skin. The specific type of yeast that causes many a diseases in human is Candida albicans. This is a normal flora, mainly showing their presence in the moist areas of human skin like armpits, mouth, groin, sexual organs (both in male and female) and fold of the buttocks. It is seen that 20-50% of any normal healthy female carry yeast in their vaginal area.

Candidiasis, or yeast infection can be localized to the skin or there may be severe systemic infection in patients having reduced immunity. These patients usually suffer from AIDS, cancer or cancer patients receiving chemotherapy drugs.

It is estimated that almost 75% of the female population will suffer from vaginal yeast infection at any point of their lifetime. This is again aggravated by previous or secondary bacterial infection like Gonorrhea and protozoal infection like Trichomonas. Some external irritants like vaginal douches or the internal hormonal disturbances derange the normal vaginal flora and there is excess production of the acid producing bacteria like lactobacilli. Regular intake of oral pills, pregnancy, stress, vaginal sex immediately after anal sex and private part lubricants containing glycerin are some predisposing factors of vaginal yeast infection.

Men can also suffer from genital yeast infection. The causes are unclean prepuce, engaging in excessive anal sex and not cleaning after that.

Oral candidiasis can occur in immunocompromized patients. This may also transmit to any person if engaged in oral sex with the infected partner. Long standing diabetes is one of the most contributory factors of oral yeast infection.

Use of antibiotics and steroids (which lowers the immunity) is the two most common causes of yeast infection of mouth cavity and private parts due to indiscriminate use by the doctors and also by the quacks. To kill this offending fungus we need some medicine called antifungal agents. Diflucan is one of them.

Diflucan, or scientifically known as Fluconazole, is an imidazole related antifungal agent which shows primary a fungistatic (inhibiting the growth of fungus) action. But in higher concentrations, Diflucan can also acts as a fungicidal agent (killing fungus). It helps to destroy the cytoplasmic membrane of the fungus and the fungal growth is retarded.

Bioavailability of Diflucan is not affected by presence of food in stomach. After absorption, it promptly shows its presence in skin, tears and urine. The concentration here are at least 10 times more that in sputum, saliva and vaginal fluid. This delineates the excretory process of Diflucan through urine and sweat. This is the reason Diflucan is preferred by doctors treating the cases of skin and vaginal yeast infection.

Patients having irregular heart rate and liver diseases must not take Diflucan as there may be aggravation of the problem. Although Diflucan is well tolerated generally, people can suffer from nausea, vomiting, abdominal cramps and diarrhea infrequently.

The major complications of Diflucan are reduced urine output, ulcerative condition of the lips and gums (Steven-Johnson’s Syndrome). Presence of Diflucan is noted in the breast milk, so nursing mothers should not take this medicine. Diflucan can lead to fetal malformations, therefore the pregnant mothers and those who are planning to have a baby in near future should avoid using Diflucan.

Diflucan is a good medicine in Yeast infection but the side effects are the restrictive factors for the wide use of this drug.

Google Redirect Virus Fix – How to Get Rid of Google Virus

Infecting users via internet exposure and nooks and crannies found in unsecured browsers are the main causes of the redirect virus. So where does one inject the use of Google redirect virus fix? In order to properly employ its use first it is essential to understand what this threat is and what it does. The redirect malware lives up to its name, the infection causes a hijacking of any search or website visit a user plans to make. Instead of finding their site of choice the virus redirects them to fake websites containing ads and even corrupted pages.

The following fake errors are displayed by the vius

  • Internet explorer cannot open web page
  • filename.exe is not a valid win32 application
  • Setup files are corrupted Please obtain new copy of program

Being a browser hijacking utility it manages to infect browsers like IE and Firefox and then redirects internet users to the following malicious sites.

  • clearask.com
  • brittaniasearch.com
  • go.Google.com
  • web-analytics.Google.com

The redirect threat is capable of disabling activated firewalls and security software which can then lead to a remotely accessible system. This allows hackers to have access over personal information such as login names, passwords, financial records etc.

What are the symptoms to consider when one wants to implement a Google redirect virus fix?

· An unknown change of desktop background

· Changes homepage

· Browsers such as IE and Firefox slows down noticeably

· Corruption of registry files thus resulting to the dreaded “Blue Screen of Death”

· Contamination of messengers, freeware and email attachments are also sure signs.

How does Google redirect virus fix work?

1. Select Show Hidden Devices under Hardware Device Manager in your Windows Control Panel.

2. Search for “TDSSserv.sys” right click Disable. Do not select Uninstall otherwise the infection will reappear once the computer is restarted.

3. Reboot the pc.

4. Immediately update antivirus software and the Google redirect virus will cease to exist in your workstation.

It pays to be vigilant and alert when using the internet. Avoid malicious sites and constantly scan your system and update your security tool to avoid contaminations. It is also best not to rely on one antivirus software alone having another reliable application can help sift through the threats that the other was incapable of detecting.

Danger of Blood Borne Pathogens Contaminations!

Blood borne pathogens are microorganisms such as viruses or bacterias that are carried in blood or body fluid and can cause disease in people, including, Hepatitis B (HBV), AIDS and the Human Immunodeficiency Virus (HIV), Blood borne pathogens can be transmitted through contact with infected human blood and other potentially infectious body fluids.

Occupation Exposure can occur through :

1. Accidental puncture from contaminated needles, broken glass, or other sharps.

2. Contact between broken or damaged skin and infected skin and infected body fluids.

3. Contact between mucous membranes and infected body fluid.

In an emergency situation involving blood or potentially infectious materials, always use Universal Precautions and try to to minimize your exposure by wearing gloves, splash goggles, pocket mouth to mouth resuscitation masks, and other barrier devices.

If you are exposed:

1. Wash the exposed area thoroughly with soap and running water. Use non-abrasive, anti-bacterial soap if possible. If the blood is splashed in the eye or mucous membrane, flush the affected area with running water for at least 15 minutes.

2. Take a blood test and Hepatitis B vaccination.

3. Tell your doctor the source individual. Try to get the individual blood tested as soon as possible for HIV or HBV after consent is obtained.

Anytime there is blood-to-blood contact with infected blood or body fluids, there is slight potential for transmission.

Unbroken skin forms an impervious barrier against blood borne pathogens. However, infected blood can enter your system through:

Open sores, cuts, abrasions, acne, and any sort of damaged skin such as sun burns or blisters, damaged or open wounds.

Always take precaution and treat all human body fluids and items soiled with human body fluids as contaminated. With contaminated, always first thing to do is to disinfect all spills of body fluid and pre-soak all contaminated clothing.

to parents how online dating about tell finer

For many people, their parents’ divorce marks a turning point in their lives, whether the divorce happened many years ago or is taking place right now.

About half the marriages in the United States today end in divorce, so plenty of kids and teens have to go through this. But when it happens to you, you can feel very alone and unsure of what it all means.

It may seem hard, but it is possible to cope with divorce — and have a good family life in spite of some changes divorce may bring.
Why Are My Parents Divorcing?

Parents divorce for many reasons. Usually divorce happens when couples feel they can no longer live together due to fighting and anger, or because the love they had when they married has changed. Divorce also can be because one parent falls in love with someone else, and sometimes it’s due to a serious problem like drinking, abuse, or gambling. Sometimes nothing bad happens, but parents just decide to live apart.

Did you know it’s really common for teens to think that their parents’ divorce is somehow their fault? Just try to remember that parents’ decisions to split up are to do with issues between them, and not because of something you might have done or not done.

Some kids feel guilty about what happened, or wish they had prevented arguments by cooperating more within the family, doing better with their behavior, or getting better grades. But separation and divorce are a result of a couple’s problems with each other, not with their kids. The decisions adults make about divorce are their own.

If your parents are divorcing, you may experience many feelings. Your emotions may change a lot, too. You may feel stressed out, angry, frustrated, or sad. You might feel protective of one parent or blame one for the situation. You may feel abandoned, afraid, worried, or guilty. You also may feel relieved, especially if there has been a lot of tension or fighting at home. These feelings are very typical and talking about them with a friend, family member, or trusted adult can really help.
How Will Divorce Change My Life?

Depending on what happens in your family, you might have to adjust to many changes. These could include things like moving, changing schools, spending time with both parents separately, and perhaps dealing with parents’ unpleasant feelings about one another.

Your parents may go to court to determine custody arrangements. You could end up living with one parent most of the time and visiting the other, or your parents may split their time with you evenly. At the beginning, it means you might have to be flexible and might have more hassles to deal with for a while.

Some teens have to travel between parents, and that can create challenges both socially and practically. Over time you can figure out a new routine that works for all of you. Often, it takes a while for custody arrangements to be finalized. This can give people time to adapt to these big changes and let families figure out what works best.

Money matters may change for your parents, too. A parent who didn’t work during the marriage may need to find a job to pay for rent or a mortgage. This might be something a parent is excited about, but he or she may also feel nervous or pressured about finances. There are also expenses associated with divorce, from lawyers’ fees to the cost of moving to a new place to live.

Your family may not be able to afford all the things you were used to before the divorce. This is one of the difficult changes often associated with divorce. There can be good changes too — but how you cope with the stressful changes depends on your situation, your personality, and your support network.
What Parents and Teens Can Do to Make It Easier

Keep the peace. Dealing with divorce is easiest when parents get along. Teens find it especially hard when their parents fight and argue or act with bitterness toward each other. You can’t do much to influence how your parents behave during a divorce, but you can ask them to do their best to call a truce to any bickering or unkind things they might be saying about each other.

No matter what problems a couple may face, as parents they need to handle visiting arrangements peacefully to minimize the stress their kids may feel. Letting your parents know that even though you know everyone is super-stressed, you don’t want to get caught in the middle.

Be fair. Most teens say it’s important that parents don’t try to get them to “take sides.” You need to feel free to hang out with and talk to each of your parents without the other parent acting jealous, hurt, or mad. It’s unfair for anyone to feel that talking to one parent is being disloyal to the other or that the burden of one parent’s happiness is on your shoulders.

When parents find it hard to let go of bitterness or anger, or if they are depressed about the changes brought on by divorce, they can find help from a counselor or therapist. This can help parents get past the pain divorce may have created, to find personal happiness, and to lift any burdens from their kids.

Kids and teens also can benefit from seeing a family therapist or someone who specializes in helping them get through the stress of a family breakup. It might feel weird at first to talk to someone you don’t know about personal feelings, but it can be really helpful to hear about how other teens in your situation have coped.

Keep in touch. Going back and forth between two homes can be tough, especially if parents live far apart. It can be a good idea to keep in touch with a parent you see less often because of distance. Even a quick email saying “I’m thinking of you” helps ease the feelings of missing each other. Making an effort to stay in touch when you’re apart can keep both of you up to date on everyday activities and ideas.

Work it out. You may want both parents to come to special events, like games, meets, plays, or recitals. But sometimes a parent may find it awkward to attend if the other is present. It helps if parents can figure out a way to make this work, especially because you may need to feel the support and presence of both parents even more during divorce. You might be able to come up with an idea for a compromise or solution to this problem and suggest it to both parents.

Talk about the future. Many teens whose parents divorce worry that their own plans for the future could be affected. Some are concerned that the costs of divorce (like legal fees and expenses of two households) might mean there will be less money for college or other things.

Pick a good time to tell your parents about your concerns — when there’s enough time to sit down with one or both parents to discuss how the divorce will affect you. Don’t worry about putting added stress on your parents, just try to pick a good time to talk when everyone is feeling calm. It’s better to bring your concerns into the open than to keep them to yourself and let worries or resentment build. There are solutions for most problems and advisors and counselors who can help teens and their parents find those solutions.

Figure out your strengths. How do you deal with stress? Do you get angry and take it out on siblings, friends, or yourself? Or are you someone who is a more of a pleaser who puts others first? Do you tend to avoid conflict altogether and just hope that problems will magically disappear?

A life-changing event like a divorce can put people through some tough times, but it can also help them learn about their strengths, and put in place some new coping skills. For example, how can you cope if one parent bad-mouths another? Sometimes staying quiet until the anger has subsided and then discussing it calmly with your mom or dad can help. You may want to tell them you have a right to love both your parents, no matter what they are doing to each other.

If you need help figuring out your strengths or how to cope — like from a favorite aunt or from your school counselor — ask for it! And if you find it hard to confront your parents, try writing them a letter. Figure out what works for you.

Live your life. Sometimes during a divorce, parents may be so caught up in their own changes it can feel like your own life is on hold. In addition to staying focused on your own plans and dreams, make sure you participate in as many of your normal activities as possible. When things are changing at home, it can really help to keep some things, such as school activities and friends, the same.

If things get too hard at home, see if you can stay with a friend or relative until things calm down. Take care of yourself by eating right and getting regular exercise — two great stress busters! Figure out what’s important to you — spending time with friends, working hard at school, writing or drawing, or being great at basketball. Finding your inner strength and focusing on your own goals can really help your stress levels.

Let others support you. Talk about your feelings and reactions to the divorce with someone you trust. If you’re feeling down or upset, let your friends and family members support you. These feelings usually pass. If they don’t, and if you’re feeling depressed or stressed out, or if it’s hard to concentrate on your normal activities, let a counselor or therapist help you. Your parents, school counselor, or a doctor or other health professional can help you find one.

Many communities and schools have support groups for kids and teens whose parents have divorced. It can really help to talk with other people your age who are going through similar experiences.
Bringing Out the Positive

There will be ups and downs in the process, but teens can cope successfully with their parents’ divorce and the changes it brings. You might even discover some unexpected positives. Many teens find their parents are actually happier after the divorce or they may develop new and better ways of relating to both parents when they have separate time with each one.

Some teens learn compassion and caring skills when a younger brother or sister needs their support and care. Siblings who are closer in age may form tighter bonds, learning to count on each other more because they’re facing the challenges of their parents’ divorce together.

Coping well with divorce also can bring out strength and maturity. Some become more responsible, better problem solvers, better listeners, or better friends. Looking back on the experience, lots of people say that they learned coping skills they never knew they had and feel stronger and more resilient as a result of what they went through.

Many movies have been made about divorce and stepfamilies — some with happy endings, some not. That’s how it is in real life too. But most teens who go through a divorce learn (sometimes to their surprise) that they can make it through this difficult situation successfully.

Giving it time, letting others support you along the way, and keeping an eye on the good things in your life can make all the difference.

Video Conferences

Videoconferences are groupware technologies that enable people in two or more locations to interact simultaneously by merging video, voice call, file sharing, instant messaging, and internet co-browsing across both Windows & Mac operating systems. Thanks to advancements high speed web connectivity, videoconferences are now more widely available at a lower cost. New, cheaper technologies such as the webcam, software compression and affordable broadband connections allow even personal users – not just business users – to enjoy video conferencing.

More importantly, video conferences have become extremely helpful in the field of medicine. It is now being applied to telemedicine – it is used to help diagnose patients remotely, conduct remote consultation, and transmit medical images and other pressing data all in real time.

Peripheral applications such as microscopes with built-in digital cameras, ultrasound tools, “videoendoscopes,” and many other related technologies can be connected to videoconferencing technology to transmit patient data. Stay-at-home patients can easily access nurses and physicians especially during medical emergency. Videoconferences also allow medical professionals to discuss cases and consult each other across large distances. Best of all, videoconferences allow patients in remote rural areas to get modern diagnosis without leaving their localities.

Videoconferences are now also widely available in schools and other educational institutions. Students, teachers and lecturers from the world over can hold classes together and even transmit these classes to isolated locations. Videoconferences have also lowered the costs of education, because students gain access to classes that their schools cannot afford to offer within their own vicinity for a lower cost.

Foreign language classes, for example, can be conducted from a remote university and transmitted to a recipient school. In some cases, videoconferences can replace field trips – economically disadvantaged students who cannot go personally to zoos, museums or to trips to other countries can immerse themselves in the same experience through the technology.

The Basic Principles of Preventing Infection

Basic Infection Control refers to measures designed to prevent the spread of infections or potentially infectious microorganisms to health personnel, clients and visitor. Various infection control measures are used to decrease the risk of transmission of microorganisms in hospitals.

Principles of Basic Infection Control

1. Microorganism move through space on air currents. Avoid shaking or tossing linens as these motions create currents on which these microorganisms can be transported. All isolation room doors should be closed to stop air currents.

2. Microorganisms are transferred from one surface to another whenever objects touch. When a clean item touches a less clean item, it becomes “dirty” because microorganisms are transferred to it. Keep your hands away from your hair and face. Keep linens away from your uniform. Always keep clean items separated from dirty ones, any object dropped to the floor is considered dirty.

3. Microorganisms are released into the air on droplet nuclei, whenever a person breathes or speaks. Coughing and sneezing dramatically increases the number of microorganisms released from the mouth and nose. Cover mouth when coughing and sneezing. Wash hands thoroughly.

4. Microorganisms are transferred by gravity when one item is held above another. Avoid passing dirty items over clean items or areas because it is possible for the microorganisms to drop off into a clean item or area. When storing items in a bedside stand, place a clean items on upper shelves and potentially dirty items such as bedpans on lower shelves.

5. Microorganisms move slowly on dry surfaces but very quickly through moisture. Use dry paper towel when you turn off faucets. Dry both basin before placing on bed side for storage.

6. Proper hand washing removes many of the microorganisms that would be transferred by the hands from one item to another.

Universal Precaution

1. Wear clean examination gloves for listed body fluids: Blood, semen, vaginal secretions, CSF, synovial fluid, pleural fluid, pericardial fluid, amniotic fluid, etc.

2. Wash hands:

  • a. Immediately after contact with body substances containing blood
  • b. Between patient care
  • c. Immediately after gloves are removed.

3. Wear masks and protective eyewear when appropriate.

4. Wear moisture-proof apron when appropriate.

5. Wear utility (household rubber) gloves appropriately

6. Dispose of equipment and secretions properly

7. Wear sterile gloves appropriately

8. Handle specimens of blood and listed body fluids appropriately

9. Handle soiled linens correctly:

a. Hold linen away from uniform

b. Do not shake or toss linen

c. Transport linen contaminated with blood or bloody fluids in leakage resistant proof bags.

Issues about Scabies Rash

Scabies rash can be identified only if it is accompanied by other symptoms of scabies. If you have a severe, persistent rash that doesn’t seem to ease up it might be caused by infestation with scabies mites. Scabies rash is characterized through itching and soreness and it tends to intensify at night. Scabies rash may also become very irritated after taking a hot shower or bath. If the skin appears to be blistery and scratched and the presence of small burrows is revealed on the surface of the skin, it is a possible sign of scabies rash and appropriate dermatological treatment is required.

An overwhelming number of 300 million people worldwide are diagnosed with scabies each year. Scabies can be very easily acquired by simply touching a contaminated person. Although scabies is very contagious, scabies rash can’t be transmitted from a person to another. Scabies rash usually occurs when the body develops allergic reactions to scabies mites and their feces. The only contagious aspect of scabies involves the mite infestation. If the mites responsible for causing scabies are transmitted to a person, they will quickly infest the skin and the symptoms of scabies will occur within a few days. Scabies mites can be acquired through direct contact with an infested person or by touching or wearing contaminated clothes or personal items. Scabies mites can live without their human hosts for about 3 days and therefore they can easily contaminate bed sheets, clothes, towels, etc.

The main cause of scabies in people is contamination with a particular type of mite, called Sarcoptes scabiei var. hominis. This microscopic mite lives only on the bodies of human hosts and an infected person can spread it to hundreds of other persons.

It is important to note that scabies rash, just like other scabies symptoms, doesn’t occur due to improper hygiene. Although in the past, when the true nature of scabies wasn’t completely understood, people considered scabies rash to be the consequence of poor hygiene, today the cause of scabies rash is clear to most people. It is true that scabies occurs mostly to people from the lower classes of society, but this has nothing to do with hygiene. The factors that facilitate the   transmission  of scabies are overcrowding and situations that involve a lot of physical contact (factory workers). Hygiene can neither facilitate the occurrence of scabies, nor prevent it.

The most common symptoms of scabies are inflammation, discomfort, pain, swelling of the skin, pustules, burrows, nodules. However, the most intense of all seems to be the scabies rash. This symptom of scabies occurs as a result of allergic reactions to the mites’ feces, secretions, eggs and larvae.

Scabies rash is among the first symptoms that occur and it is usually the last one to disappear. Even if the condition is appropriately treated with topical medications, scabies rash may persist for another few weeks! This is due to the fact that even after they die, the mites remain under the skin and continue to produce allergies that cause scabies rash. The mites’ secretions contain substances that are toxic to the human body. However, there are ways of easing the itch, soreness and pain characteristic to scabies rash. Dermatologists usually prescribe hydrocortisone and antihistamine along with the treatment for scabies. These topical medications are usually in the form of creams, gels and ointments and they ameliorate scabies rash. However, if the scabies rash persists and even intensifies after a few weeks, it is a sign that the mite infestation hasn’t been eradicated and the treatment needs to be repeated.

Benefits of Using a VoIP Telephone

Most of you would have heard about VoIP and for those who haven’t it’s never too late. VoIP stands for Voice over Internet Protocol and is revolutionizing the telephone industry by combining the benefits of traditional analog telephones and modern day internet. VoIP telephone works by converting the analog signals into digital signal so that you get superb audio quality.

Companies now offer VoIP services all over the world at very reasonable rates. Although, it is very difficult to make people forget about traditional landline phones and make them use VoIP, but it comes with a full bag of benefits which make it very difficult to ignore. Slowly but steadily VoIP is catching up popularity among masses and classes both. Some of the main benefits of VoIP telephone over traditional phones are:

• The call rate for long distance calls is very less in VoIP thus making the landline phones not so useful.

• As compared to the pulse rate service provided by landline phone companies most VoIP service providers offer packages wherein you get unlimited talk time at a flat rate. So you don’t have to keep track of the watch while making an international call. This facility is very useful if your family lives in some other country and you are in other country for some purpose. You can interact with your family and friends for as long as you want.

• Use of VoIP for conference calling and multi way calling is relatively easy. Unlike traditional phones which only offer 3 way calling you can add as many people to your conversation as you want in VoIP. Also the facility of conference calling makes it a perfect tool for holding telephonic seminars, conferences and telephonic interviews.

• Most VoIP service providers have the option of combined plans wherein you pay for your broadband usage and VoIP usage together. Hence you can save good amount of money by using VoIP over traditional phones.

• Use of VoIP telephone will substantially cut down on your telephone bills. Even the most costly VoIP provider is very cheap when compared with traditional landline companies. Plus the quality you get is unmatchable as it is completely digital and is very likely to be affected by additional factors unlike traditional landline which used wires for   transmission  so if anything happens to the wire your service gets hampered.

• Many features for which you pay extra on your landline come free with VoIP telephone.

These along with other features make VoIP technology very hard to resist and a good alternative for traditional landline phones.

EDGE: A Stepping-stone Toward 3G Technologies in Pakistan

ABSTRACT

The business of wireless data is expected to grow in the region of 100-200 % per annum and the mobile communication industry agrees that wireless data services will form the foundation for future business. The enormous success of short messaging in many countries proves that people accept the benefits of non-voice services.

Enhanced Data Rate for Global Evolution (EDGE) is a technology that gives Global Systems for Mobile Communications (GSM) the capacity to handle services for the third generation of mobile telephony. It provides three times the data capacity of General packet Radio Service (GPRS). Using EDGE, operators can handle three times more subscribers than GPRS; triple their data rate per subscriber, or add extra capacity to their voice communications.

This article provides an overview of EDGE technology. In particular, starting from the introduction of this 2.5G technology I describe the core technical aspects and distinct features. I will provide a comparison with GPRS for data services and then a survey of the current state of this technology in Pakistan. I have also covered some benefits for operators and customers.

1. Introduction

The importance of wireless data and multimedia services both for business and end customers are increasing on an unparalleled scale. Enhanced Data Rates for GSM Evolution (EDGE) is a new radio interface solution and is based on an enhanced modulation. EDGE offers GSM network operators an evolution path to mobile data and multimedia services with a three fold increase of data throughput in the existing GSM spectrum. EDGE therefore provides an alternative for operators who do not have a Universal Mobile Telecommunication System (UMTS) license. Moreover it also represents a complement to UMTS for operators intending to first deploy UMTS only in densely populated areas, but who can also use EDGE to provide wide area coverage of future oriented 3G services. In the US market operators have chosen EDGE as the 3G solutions. [8].

We are presently experiencing the Wireless Application Protocol (WAP) as well as the higher   transmission  speeds of High Speed Circuit Switched Data (HSCSD), joined by the convenience of “always on-line” direct Internet connections with GPRS. [1]

EDGE, new radios interface technology with enhanced modulation, increases the HSCSD and GPRS data rates by up to three fold. EDGE modulation is going to increase the data throughput provided by the packet switched service even over 400 kbps per carrier. Similarly, the data rates of circuit switched data can be increased, or existing data rates can be achieved using fewer timeslots, saving capacity. Accordingly, these higher speed data services are referred to as EGPRS (Enhanced GPRS) and ECSD (Enhanced Circuit Switched Data).

EDGE, is a major improvement in GSM phase 2+. As a modification to existing GSM networks, EDGE does not require new network elements. [1]

In the US, for instance, EDGE is part of the IS-136 High Speed concept, which is one of the third generation Radio  Transmission  Technology (RTT) proposals from TR.45. EDGE is eventually going to be standardized which makes possible to achieve a global mobile radio system with many services characteristic to third generation systems.

2. Overview

The increased bit rates of EDGE put requirements on the GSM/GPRS network architecture. Figure. 1 illustrates the GSM/GPRS architecture, the shaded parts of which are discussed in this section. Other nodes and interfaces are not affected at all by EDGE introduction. An apparent bottleneck is the A-bis interface, which today supports up to 16 kb/s per traffic channel. With EDGE, the bit rate per traffic channel will approach 64 kb/s, which makes allocation of multiple A-bis slots to one traffic channel necessary. Alternative asynchronous transfer mode (ATM) or IP-based solutions to this problem can also be discusses.

One important fact is, however, that the 16 kb/s limit will be exceeded already by the introduction of two coding schemes (CS3 and CS4) in GPRS, which have a maximal bit rate per traffic channel of 22.8 kb/s. Consequently, the A-bis limitation problem is being solved outside the EDGE standardization, and it is therefore a GPRS related, not EDGE-related, modification. For GPRS-based packet data services, other nodes and interfaces are already capable of handling higher bit rates, and are thus not affected. For circuit-switched services, the A interface can handle 64 kb/s per user, which is not exceeded by EDGE circuit-switched bearers. [9]

2.1. Impact on GSM Network Planning

An important prerequisite, which to a large extent will determine the success of EDGE in GSM, is that a network operator be able to introduce EDGE gradually. For initial deployment, EDGE-capable transceivers will supplement standard GSM/GPRS transceivers in a subset of the existing cells where EDGE coverage is desired. Hence, an integrated mix of GSM, GPRS, and EDGE users will coexist in the same frequency band. To minimize effort and cost for the network operator, radio network planning (including cell planning, frequency setting of power and other cell parameters) must not require extensive modification.

2.1.1. Coverage Planning

One characteristic of non-transparent radio link protocols that include automatic repeat request (ARQ), is that low radio link quality only results in a lower bit rate for the user. Hence, low SIR for a user does not result in a dropped call, as for speech, but in a temporary decrease of user bit rate. For transparent bearers, which typically offer a constant bit rate, link quality control must be extended to incorporate resource allocation, in the sense that the number of dynamically allocated time slots fits the bit rate and bit error rate (BER) retirements. Transparent bearers, will thus be available in the entire GSM cell, but require fewer time slots in the center of the cell (where 8-PSK coding schemes can be used).

2.1.2. Frequency Planning

Most mature GSM networks of today have an average frequency reuse factor of around 9 (meaning that available frequencies are divided into nine frequency groups). However, there is also a trend toward tighter reuse factors. With the use of frequency hopping, multiple reuse patterns (MRP), and discontinuous  transmission  (DTX), reuse factors as low as 3 become feasible. EDGE supports a variety of reuse patterns. In fact, by its use of link quality control, EDGE can be introduced in an arbitrary frequency plan, and benefit from high SIR closer to the base stations. EDGE can be introduced in an existing GSM frequency plan, and that it also supports future high-capacity solutions based on tighter frequency reuse.

2.1.3. Radio Network Planning

An important prerequisite (and to a large extent, one that will determine the success of Edge) is that network operators should be able to introduce Edge gradually. The initial deployment of Edge-capable transceivers will supplement standard GSM transceivers in a subset of cells where Edge coverage is desired. An integrated mixture of circuit-switched, GPRS and Edge users will thus coexist in the same frequency band. To minimize operator efforts and costs, Edge-related implementation must not require extensive modification of the radio network plan (including cell planning, frequency planning, the setting of power levels and other cell parameters).

2.1.4. Channel Management

After Edge has been introduced, a cell will typically include two types of transceiver: standard GSM transceivers and Edge transceivers. Each physical channel (time slot) in the cell can be viewed as being one of at least four channel types:

1. GSM speech and GSM circuit-switched data (CSD);

2. GPRS packet data;

3. Circuit-switched data, enhanced circuits witched data (ECSD), and GSM speech;

4. Edge packet data (EGPRS), which allows a mix of GPRS and EGPRS users simultaneously.

While standard GSM transceivers only support channel types 1 and 2, Edge transceivers support all four channel types. Physical channels are dynamically defined according to terminal capabilities and needs in the cell. For example, if several speech users are active, the number of type-1 channels is increased, at the expense of GPRS and Edge channels. Obviously, channel management must be automated, to avoid the splitting of channels into static groups. Otherwise, trunking efficiency would diminish.

3. Interleaving

To increase the performance of the higher coding schemes in EGPRS (MCS7 to MCS9) even at low C/I, the interleaving procedure has been changed within the EGPRS standard. When frequency hopping is used, the radio environment is changing on a per-burst level. Because a radio block is interleaved and transmitted over four bursts for GPRS, each burst may experience a completely different interference environment. [7]

If just one of the four bursts is not properly received, the entire radio block will not be properly decoded and will have to be retransmitted. In the case of CS4 for GPRS, hardly any error protection is used at all. With EGPRS, the standard handles the higher coding scheme differently than GPRS to combat this problem. MCS7, MCS8 and MCS9 actually transmit two radio blocks over the four bursts, and the interleaving occurs over two bursts instead of four. This reduces the number of bursts that must be retransmitted should errors occur. The likelihood of receiving two consecutive error free bursts is higher than receiving four consecutive error free bursts. This means that the higher coding schemes

for EDGE have a better robustness with regard to frequency hopping.

4. EDGE & GPRS

EDGE, or the Enhanced Data Rate for Global Evolution, is the new mantra in the Global Internet Connectivity scene. EDGE is the new name for GSM 384. The technology was named GSM 384 because of the fact that it provided Data  Transmission  at a rate of 384 Kbps. It consists of the 8 pattern time slot, and the speed could be achieved when all the 8 time slots were used. The idea behind EDGE is to obtain even higher data rates on the current 200 KHz GSM carrier, by changing the type of the modulation used.

Now, this is the most striking feature. EDGE, as being once a GSM technology, works on the existing GSM or the TDMA carriers, and enables them to many of the 3G services. Although EDGE will have a little technical impact, since its fully based on GSM or the TDMA carriers, but it might just get an EDGE over the up coming technologies, and of course, the GPRS. With EDGE, the operators and service providers can offer more wireless data application, including wireless multimedia, e-mail (Web Based), Web Infotainment, and above all, the technology of Video Conferencing.

Now all these technologies that were named earlier, were the clauses of the IMT-UMTS 3G Package. But, with EDGE, we can get all these 3G services on our existing GSM phones, which might just prove to be a boon to the user.

The current scenario clearly states that EDGE will definitely score higher than GPRS. The former allows its users to increase the data speed and throughput capacity, to around 3-4 times higher than GPRS.

Secondly, it allows the existing GSM or the TDMA carriers to give the sophisticated 3G services. And with 1600 Million subscribers of GSM in over 170 countries, offer the full Global Roaming, anywhere between India to Japan and to San Francisco. Based on an 8 PSK modulation, it allows higher bit rate across the air Interface. There is one symbol for every 3 bits. Thus, EDGE Rate is equal to 3x GPRS Rate.

5. Future Evolution Towards WCDMA

The next evolutionary step for the GSM/EDGE cellular system includes enhancements of service provisioning for the packet-switched domain with the service provisioning in UMTS/UTRAN (UMTS terrestrial radio access network). GERAN will provide improved support for all quality of service (QoS) classes defined for UMTS: interactive, background, streaming and conversational. By doing so, a new range of applications, including IP multimedia applications, will be adequately supported. This part of the GSM/EDGE evolution focuses on support for the conversational and streaming service classes, because adequate support for interactive and background services already exists. Additionally, parallel simultaneous bearers will support multimedia applications with different QoS characteristics towards the same MS, such as multiple media streams handled through IMS domain. A driver for such evolution on the packet-switched side is the paradigm shift within the telecommunications world from circuit to packet-switched communications.

Both the core network defined for GPRS and the current GSM/EDGE radio access network require modifications to support enhanced packet services. The GPRS/EGPRS networks can quickly and cost effectively evolve with market needs, and align with services provided by WCDMA networks. The current evolution of GSM/EDGE, which covers all of the above aspects, is being standardized in 3GPP TSG GERAN. [4]

6. EDGE in Pakistan

Pakistan has the sixth largest population in the world – approximately 150 million. There are currently four mobile operators in the country. Mobile penetration at the end of 2003 was just 2.3% with a subscriber base of 3.4 million, while fixed line penetration was approximately 2.4%. Many geographic areas in Pakistan are without telephone coverage. To accompany recent positive economic development in Pakistan and the inherently low mobile penetration, high growth within the mobile segment is expected. At the moment the people in Pakistan are more concern with the text-enabled facility like SMS. Although the introduction of GPRS gave a new concept and new boost in Cellular network but still, people are not that much concern using Internet by their terminal. Few think that it still more costly and few believe that GPRS didn’t develop the interest for using Internet if we compared it by computer.

In April 2004 Norwegian mobile telecom operator, Telenor, bid for and ultimately won a license to operate a cellular network in Pakistan. The license covers the operation of Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS) and Enhanced Data Rates for Global Evolution (EDGE) technology for the network. [14]

Telenor Pakistan has signed two deals with mobile infrastructure contractors for different areas of the network:

Nokia have signed a three-year deal to build and operate a GSM / GPRS / EDGE network to cover the central and Northern Punjab region (phase one), centered around Lahore.

Siemens have signed a deal to build a GSM / GPRS / EDGE network to cover the southern areas of Pakistan, centered around Islamabad.

Further enhancements in data capability over the core GPRS / GSM network will be provided in both networks with the installation of Enhanced Data for Global (GSM) Evolution technology. This component of the two systems will be installed after the initial roll-outs and will allow the subscribers to have the use of advanced mobile services such as downloading video and music clips, full multimedia messaging, high-speed color Internet access and email on the move.

Nortel Networks will upgrade Ufone’s existing wireless systems and supply new GSM/GPRS core network and radio access equipment, including Mobile Switching Center, Home Location Register (HLR) and advanced Base Transceiver Stations (BTS).

A key component of the Ufone expansion will be Nortel Networks BTS 12000, designed to deliver additional capacity within a GSM/GPRS network while positioning operators to drive lower costs and to offer advanced wireless services based on third generation (3G) EDGE (Enhanced Data for GSM Evolution) technology. The expansion will also include Nortel Networks Passport Packet Voice Gateway (PVG) for migration of TDM voice trunking to a packet-based infrastructure.

7. Benefits

As highlighted previously the need to reduce business risk and make the best use of existing resources is of paramount importance within today’s business environment.

7.1. Financial

GSM based networks have become the standard within the cellular landscape. As EDGE is a GSM based technology and provides an enhancement for GPRS at a little additional cost it is considered the best way in which to capitalize on existing resources. [1]

7.1.1. Radio Access Network

In most cases GPRS enabled base stations and BSC’s can be simply upgraded to EDGE by way of relatively low-cost software and hardware upgrades, which will pro-long the life cycle of the deployed RAN elements.

7.1.2. Core Network

For GPRS enhancement, there is very little modification to be completed within a GPRS enabled core network, thus enhancing the sunk core network investment.

7.1.3. Antenna Sites

There is no requirement for additional antenna sites when deploying EDGE. Assuming high quality linear amplifiers with high RF output power are used within the BTS, the coverage pattern will be the same as the existing GPRS deployment, so protecting existing site investment.

7.1.4. Spectrum Utilization

EDGE triples the GPRS data capacity whilst using the existing GSM spectrum and offers up to three times the GPRS data rate to the end user. EDGE is spectrally the most efficient radio technology for data applications requiring up to 100Kb/s throughput (compared to CDMA and WCDMA), and only WCDMA is spectrally better for higher throughputs.

7.1.5. Applications

GPRS enabled applications and services will generally not require any additional investment to become EDGE compatible. This is also valid for known WCDMA applications.

Although the financial benefits of EDGE can be apportioned to individual network elements as outlined above, one of the main business drivers is that EDGE forms an essential part of the overall GSM evolution towards a seamless multi-radio GSM/ GPRS/EDGE/WCDMA network. As mentioned previously GSM is the main standard for cellular communications worldwide and the business benefits of deploying an industry standard technology can be seen in nearly every aspect of a network deployment, from end-user devices, to applications to hardware.

7.2. For Operator

Operators can also experiences the advantages of EDGE in following ways.

7.2.1. Migration to wireless multimedia services

The operator can increase data revenues by offering attractive new types applications to end-users.

7.2.2. Improved customer satisfaction

Increased data capacity and higher data throughput will decrease response times for all data services, thus keeping end users satisfied and connected.

7.2.3. Early deployment of 3G type applications

EDGE networks are expected to emerge in year 2001, when mature markets are likely to start demanding multimedia applications.

7.2.4. Quick network implementation

EDGE will not require new network elements and EDGE capability can be introduced gradually to the network.

7.3. For User

7.3.1. Improved quality of service

Increased data capacity and higher data throughput will eventually satisfy the customers’ need for QoS.

7.3.2. Personal multimedia services

Attractive new types of applications and terminals will become available.

7.3.3. Potentially lower price per bit

Lower cost of data capacity for high-speed data applications gives the operator flexibility in pricing.

8. Conclusion

While the tug of war between access technologies – CDMA vs. UMTS vs. GSM — continues to be debated globally, EDGE provides an ideal solution for GSM carriers to add data capacity using limited spectrum. Keeping in view the fact that GSM supports more subscribers today than any other access technology (roughly 65 to 70% of the global subscriber market), and that GSM/GPRS operators are scrambling to add capacity to support user growth and launch next generation data services, the increased capacity and throughput offered by EDGE becomes very compelling. And, in a market where wireless carriers must squeeze the most out of capital outlays–past and future, it is no real surprise that we are going to see a renewed wave of interest in EDGE from our GSM customers.

Today the position of EDGE as a technology evolution of GSM is clear. Initially promoted as an alternative to WCDMA and generally a niche technology, EDGE is now regarded as a key enabler for GSM/EDGE and WCDMA operators alike. Being able to drive business value from existing GSM infrastructure and spectrum is one of the main advantages, and along-with the ability of EDGE to reduce CAPEX, time-to-market and time-to-revenue, with regards the delivery of global high-speed data services, EDGE is a must technology.

The cellular companies working in Pakistan did not have the license for the EDGE. Now as the introduction of some new companies like Telenor and WARID, it is possible that in near future Pakistan will also be able to use this facility. Then GPRS can become a real important factor in cellular network, as the people in Pakistan will use the Internet not only for downloading ring tones but also can enjoy the streaming videos by their cell phone and so many other facilities.