what is uniform and non uniform traffic distribution in cellular networks?
398485
Uniform traffic distribution assumes that all the users in all the cells are spread out in near equi-distant locations.  It also means that no individual cells and no sector or section of an individual cell in the network have a significantly higher density of users than other parts of the network, cell, or sector.\n\nA synonym for "uniform" is "even."\n\nWith "uneven" or "non uniform" traffic distribution, the users will end up clumped together.
897418
typically, a wireless ISP transmits at a different frequency than your laptop card is on ... Cingular Data connect is a hotspot service. ... usually, those are provided at commercial locations like coffee shops or public buildings ... check your local area for a wireless ISP provider.
165850
Poisson distribution is a discrete distribution whereas the normal (Gaussian) distribution is continuous.  The Gaussian distribution is symmetrical and goes to infinity on each side, whereas Poisson is infinite on one side and finite on the other.  Per source, “[Poisson] expresses the probability of a number of events occurring in a fixed time if these events occur with a known average rate, and are independent of the time since the last event."  Thus, Poisson is often the best model of a queue.\n\nThe phenomenon of people arriving in groups is not explicitly modeled by Poisson.  It may be partially accounted for by samples with a very small inter-arrival interval.  If you need to model a queue that typically services people arriving in groups of varying sizes, Poisson may not be the best model.
536879
3G isn't simply a mobile phone related matter! The Word 3G is an acronym which stands for 3rd Generation of the mobile network. Therefore, the effectiveness simply is not limited to the phone units itself. The phone does the receiving and transmitting part for this network. That’s what it does!\n\nEffectiveness of the 3G Mobile Network\n\n1. Higher Data Transfer Speeds: up to 2Mbps, beating Edge, GPRS technology.\n \nData transfers in MBPS I’m not joking! With 2G and 2.5G we are limited to speeds of a maximum of 90 or 56 kbps downloading and 38kbps when uploading, which is similar to a dial-up modem transfer speed.\n\nBut with the introduction of 3G its gone up to 144kbps to 2Mbps. These speeds are much similar to DSL transfer rates. Imagine you could download "YYY MB’s" (Y=variable) in few seconds/minutes on your mobile phone! \n\n\n2. Better Banding for your phone calls: 2100MHz and higher waves are waiting for you!\n\nThis enhances the voice call clarity due to the higher banding ranges, i.e. 2100MHZ and above. The Banding is one fact that decreases the congestion occurred due to heavy network traffic. The higher the banding spectrum the lesser the chance of having a totally unusable "Busy Network", except for certain other calamities that could occur i.e. chain network messages and many more .\n\n3. Cheaper/Quicker Solutions for Corporate and Federal Institutions/Companies: Live-Video Conferencing via 3G\n\nFor companies who frequently have international meetings, gatherings that are un-avoidable this would be a great solution! As a part of cost cutting you could use this alternative. The costs compared with an individual representative flying to that particular location in some-part of the world and the cost involved with the representative attending the forum/meeting at the local office premises itself is imaginable.\n\nEfficiency of these services is much likely to be at higher standards. Therefore, the “Corporate or Federal World” could taste the high flavoured cup-of-tea at a cheaper price!\n\nSo your taxes may set at ease! I hope. Hope the federal reserve doesn’t allocate them to some other expenditure.\n\n4. Globalization is a must: Anyone has access to 3G! (Except for the ones who have not subscribed it!)\n\nWith the enhancement of these services, human inter-related communications, tend to have a great increase. Higher the networking capability, higher the coverage. Higher coverage means that more people have access to it. This drives more users, and finally it creates a really big community!\n\nMany Mobile Carriers are having their hard days, making their cost structure much more attractive to subscribers. So, you have a chance of getting 3G at a comparatively lower cost. Yet, it would be fixed cost i.e. minimum of 200 hours air time, not at a variable rate. \n\n5. Mobile Phone Companies: Wow! Great sales this season! (Seasonal Profits! No they aren’t!)\n\nIt is a new feature, not that new although, that would be bundled into their fancy or sleek model product-lines. They will require sometime to drag the buyers to go for it, though. However it would increase sales at a very higher marginal rate, when 3G becomes more accessible. It’s a new stream-line for the mobile phone companies! \n\n\nThat’s it for the effectiveness of 3G I could personally contribute. Hope it was helpful.\n\nGood Luck!
1005841
usually the two types are referred to as Ad-hoc or Infrastructure.   \n\nAd-hoc wireless networks are peer-to-peer networks based on the various wireless computers on the network passing the information between themselves without the use of a router or access point.\n\nInfrastructure wireless networks use a router or access point to manage the connection.
111583
The free space losses increases in log ratio with frequency, Since your mobile has much less power than the Base Station, using a lowe frequecy the attenuation due the distance is less in the uplink. \nYou can see the same issue in satellite communications. Earth stations uses higher frequencies than satelites.\nFSL = 20Log(F*d)+ 32.4\nF: Frequency (MHz)\nd: Distance (Km)
892945
Keep the phone in teh good signal area.\n\nIt also depends on peak time where in the high peak time there will be slow data transfer speed.\n\nIn that siutation, disconnect and reconnect, u will get 12 to 14 kbps transfer rate.\n\ngud luck\n\naroun
202820
The nature of the routing of the internet,
952174
That is the central limit theorem.  Each distribution can be uniform, but the distributions themselves are normally distributed in their range, their value, their frequency.\nRead the attached link for more details.
255636
The communication of signals is accomplished differently.   To allow many people to communicate at the same time, without interfering with one another, different modulation methods are used.  CDMA is "Code Division Multiple Access" and communication is separated by using different orthogonal code sequences. In both CDMA and GSM phones, your voice signal is first turned into a digital sequence of "1" and "0" symbols.  In CDMA, this sequence is convolved with a unique code (the spreading code) and sent using a large frequency space (bandwidth).  In TDMA (Time Division Multiple Access) which is the modulation format used in GSM phones, your digital sequence is sent without interference by sending your sequence at a time when other transmitters are not on the air.  In this way, GSM uses time, to temporally separate signals.  Both GSM and CDMA phones use multiple channels to further expand the number of users that can be 'on the air' without interfering with each other.  The use of multiple channels is called FDMA or Frequency Division Multiple Access.
926046
1 MB, 2 MB, 8 MB etc.. speeds are not big deal for now since most applications on the internet ran smoothly even with speeds less than 1 MB.. Unless if .you are browsing on a graphic/flash-heavily  intensive site. but that's just less than .01% of all sites in the internet.. Also if you are downloading large files downlink speed is important.. If you are uploading files uplink speed is important.. but you have to check your provider on these..  But for me this is not too important considering with the competition most providers provide faster speeds.\n\nWith that said, what I can suggest is you choose a provider that has a good tracking record with 99.99% uptime, with consistent speed and above all 24 hour technical PHONE support..\n\nThere are other criteria but for me those above are my priority\n\nGoodluck!
1080095
That depends on the application that ur gonna use over the link. The kind of connectivity for example do you have VPN connections? You should come to the final analysis after doing a project wise segregation.\n\nCalculate usage for a single person. \n\nFor expample.\n\nInternet Usage: 10Kbps\nProject file uploads: 50Kbps\nTotal: 60Kbps/user\n\nLets say you have 1000 users. So, 60*1000 = 60000Kbps for the entire project.
1134973
1.Low power devices 2.Absence of CSMA/CD 3.SDM using cells\n4.Use of WAP.5.Difference of WAP n TCP/IP.6.frequency reuse
972543
Today's star topologies are connected via an active switch, which eliminates collisions...thus higher throughput.\n\nIf you use a passive hub instead, yes, you will have collisions as more and more devices are added to the lan...along with exponential backoffs and slower throughput.
361153
Cable:\npro - independent of distance to ISP server (speed remains always the same)\ncons - share bandwidth with other users on the same line (cable)\n\nDSL:\ncons - dependent of distance to the ISP server (the more away you are the slower the speed)\npro - no share of bandwidth with other users on the same line
1031745
The difference in frequency has all to do with the coverage of a cell. 1800s cover less area (More the frequency, more attenuation, less area) 900s cover more.\n\nThe base station that transmits the voice to cellphones do that on a TDMA and FDMA basis. \n\nIf you need to do the shift of frequencies, you will have to look for the neighbouring cells and their frequencies.
887807
click here:http://en.wikipedia.org/wiki/Asymmetric_Digital_Subscriber_Line\n\nyes