WiMax 4G

Most common questions and answers used to hire WiMax 4G Professionals. We’ve compiled a list of the most common and frequently asked interview questions in WiMax 4G. If you want to ace your job interview, then checkout these Interview Questions.

Q.1 What do you understand by Wimax Technology?

WiMAX Technology is an IP-based, wireless broadband access innovation that gives performance related to 802.11/Wi-Fi networks with the coverage and QoS (quality of service) of cellular networks. Also, WiMAX is an acronym signifying "Worldwide Interoperability for Microwave Access” (WiMAX).

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Q.2 Explain Base Station In Wimax System.

The central radio receiver/transmitter is installed by the service provider to air WiMax signals. These communications are typically installed on towers or high buildings. Cellular networks are based on the theory of cells (a reasonable division of geographical region), each cell has designated a frequency and is accepted by a base station. The base station includes a receiver, transmitter, and control unit. Tangent base stations practice various frequencies to bypass cross-talk.

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Q.3 Describe the Open Systems Interconnection model of communication.

In the (OSI) Open Systems Interconnection form of communication, the Media Access Control panel is one of two sublayers of the Data Link Control layer and is regarded with experiencing the physical attachment to the network between various computers. Each computer has its personal MAC address. Ethernet is an illustration of a protocol that operates at the Media Access Control layer level.

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Q.4 What does Wimax sustain for encryption?

WiMAX supports: Advanced encryption standard The triple data encryption standard

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Q.5 Define WiMAX MAC layer.

The WiMAX MAC layer is essentially an adaptation layer among the physical layer and the upper layers in the whole stack. The MAC layer has been improved to give the functionality needed for a point-to-multipoint arrangement. Also, the MAC layer is able to give support for the various physical layers required for the different flavors of WiMAX that are in use.

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Q.6 How fast is 4g in comparison to 3g?

Today, WiMax providers are endeavoring contracts that show download speeds of within 2 megabits per second and 6 Mbps, with top speeds of 10 Mbps and more extended.

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Q.7 What do you understand by Jitter?

In the connection of computer networks and in the case of the WiMAX system, jitter is a measurement of the variability over terms of the packet latency beyond a network. A network with consistent latency has no variation and therefore no jitter. Though as the levels of data are continually varying, it uses a variable quantity of time for a packet to reach its target. Packet jitter is shown as an average deviation from the network mean latency.

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Q.8 What are the major elements of the WiMAX network architecture?

The elements or we can say areas of the WiMAX network architecture are: Remote or Mobile stations: These are the user equipment that can be mobile or fixed and be located in the assumptions of the user. Access Service Network: This is the section of the WiMAX network that builds the radio access network at the point and it contains one or more base stations and one or more ASN gateways. Connectivity Service Network: This section of the WiMAX network gives the IP connectivity and every IP core network works. It is what may be described as the central network in cellular parlance.

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Q.9 Which modulation schemes are encouraged by Wimax?

The modulation schemes are backed by WiMAX are: 1. Binary phase-shift keying inflection 2. Quadrature phase-shift keying modulation 3. Quadrature amplitude modulation

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Q.10 What do you mean by Multilink dial-up?

Multilink dial-up gives improved bandwidth by soldering two or more dial-up connections collectively and managing them as a single data channel. Also, it needs phone lines, two or more modems, and dial-up accounts, also an ISP that promotes multilink – and of course any line and data prices are also doubled.

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Q.11 Is Wimax secure or not?

Yes, WiMax is a standard-based form, and WiMax standards are well established to give much useful and manageable security than wi-fi networks. ★ WiMax security stack helps two encryption models, one is popular (Data Encryption Standard) DES3, and the other is (Advanced Encryption Standard) AES. ★ Additionally, it needs a dedicated security processor for the base station. ★ It also establishes the least encryption conditions for the traffic and for end-to-end authentication.

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Q.12 What do you mean by leased lines?

Leased lines are devoted lines practiced principally by ISPs, businesses, and other great enterprises to combine LANs and campus networks to the Internet utilizing the current foundation of the public telephone network or different providers. Delivered using wire, radio, optical fiber, and leased lines are utilized to give Internet access immediately as well as the building blocks from which various other kinds of Internet access are built.

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Q.13 What do you understand by the Wimax Gateway?

It is a stand-alone indoor appliance that is installed in a good reception space. It actions as a wi-fi access time for other things like VOIP handset, home pc, etc. Also, WiMax operators usually give this gateway project or subscriber unit which interfaces with the base station and gives wi-fi access within home or office for devices such as laptops, smartphones.

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Q.14 Tell us about the DSL Rings.

(DSLR) DSL Rings or Bonded DSL Rings is a ring topology that practices DSL technology over living copper telephone wires to give data rates of up to 400 Mbit/s.

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Q.15 What are Wimax Qos Classes?

The WiMAX QoS classes I know are: UGS rtPS ertPS nrtPS BE

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Q.16 What do you understand about the Power-line Internet?

Power-line Internet, which is also known as (BPL) Broadband over power lines, provides Internet data on a channel that is also utilized for electric power transmission. Due to the widespread power line foundation previously in place, this technology can give people in rural and low population fields obtain the Internet at a small cost in phrases of new transmission facilities, cables, or wires. Data rates are asymmetric and usually range from 256 kbit/s to 2.7 Mbit/s.

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Q.17 Tell us something about the ATM and Frame Relay?

(ATM) Asynchronous Transfer Mode and Frame Relay are wide-area networking models that can be utilized to give Internet access straight or as building blocks of other access technologies. For instance, several DSL implementations utilize an ATM layer over the low-level bitstream layer to allow a quantity of various technologies across the same link. Further, customer LANs are typically attached to an ATM switch or a Frame Relay node managing leased lines at a wide array of data rates.

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Q.18 Explain Wimax Tlv Encoding format.

In WiMAX, TLV formats are accepted for parameters in mac management messages as well as a configuration file. TLV stands for Type, length, and value. The size of the type field will be always 1 byte. The size of the length field is either 1 byte or more than 1 byte.

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Q.19 What is a Local Multipoint Distribution Service?

(LMDS) Local Multipoint Distribution Service is a broadband broadcast access technology that utilizes microwave signals operating between 26 GHz and 29 GHz. Originally intended for (DTV) digital television transmission, it is considered as a fixed broadcast, point-to-multipoint technology for utilization in the closing mile. Data rates vary from 64 kbit/s to 155 Mbit/s.

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Q.20 What is WiMAX Forum’s (NWG) Network Working Group?

The WiMAX Forum’s(NWG) Network Working Group, is accountable for producing the end-to-end network demands, architecture, and etiquettes for WiMAX, using IEEE 802.16e-2005 as the air interface.

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Q.21 What do you understand by Base station (BS)?

The BS is accountable for rendering the air interface to the MS. Additional purposes that may be a portion of the BS are micro-mobility management purposes, like handoff triggering and tunnel demonstration, QoS policy enforcement, session management, radio resource management, DHCP, key management, and multicast group management, etc.

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Q.22 State some functions of the Mesh architecture.

Mesh architecture catches the great security envisioned by the initial Internet pioneers. Mesh probably offers benefits to the service provider involving negating the demand for a separate backhaul network and reliability. The safety function of the mesh network is important in that if one node crashes, backhaul traffic could be routed around that failed node reducing the service division to only those subscribers undeviatingly served by that abandoned base station.

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Q.23 Tell us something about the Link Budget?

It is the equalization of the power of a signal conveyed minus discrediting among the transmitter and receiver (interference from other broadcasters, rain, gain at the antennas ate either end, vegetation,) and what signal is sustained at the receiver.

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Q.24 What factors does the Site survey involve?

It includes checking the Line of Sight between the Access unit and Subscriber unit Wimax can also operate in NON-Line of Site form. Estimating the Distance between the Subscriber unit and Access unit. Mapping the Radion interface found in the site Basic stipulation for Wimax

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Q.25 What are the key attributes that should be focused on while evaluating WiMAX devices?

Operators assessing WiMAX devices should make choosing criteria across 4 key attributes: Performance Convenience Control Reliability

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Q.26 State some benefits of the Higher receive sensitivity.

Higher receive sensitivity offers the system-wide benefits such as: More comprehensive coverage space for a cell site More considerable area accepted by higher-order modulation within cell radius Scattered base sites needed within the service perimeter More necessary end-user efficient throughput More magnificent understanding for deep indoor penetration

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Q.27 Explain Frequency reuse.

Frequency reuse is the method of practicing the same radio rounds on radio transmitter places within a geographic region that are distributed by adequate distance to generate minimum resistance with each other. Frequency reuse supports a dramatic improvement in the number of customers that can be completed (capacity) within a geographic region on an inadequate amount of radio spectrum (insufficient number of radio channels).

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Q.28 What is a Soft Switch?

A Softswitch is a central mechanism in a telecommunications system that connects telephone calls from 1 phone line to different, typically via the internet, uniquely by centers of software managing on a general-purpose computer system. Further, most landline calls are routed by formerly using physical switchboards, purpose-built hardware, but soft switches are the powerful 21st-century trend.

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Q.29 Explain Multiprotocol Label Switching.

(MPLS) Multiprotocol Label Switching is a device in high-performance telecommunications systems that delivers data from 1 network node to the next based on compact path labels rather than long-drawn network addresses, bypassing complicated lookups in a routing table.

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Q.30 What are the standardized protocols for maintaining MPLS paths?

There are 2 standardized contracts for maintaining MPLS paths: (LDP) the Label Distribution Protocol and RSVP-TE, an expansion of the (RSVP) Resource Reservation Protocol for traffic engineering.

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Q.31 What do you understand by Multicast?

Multicast was for the largest part an after-thought in MPLS configuration. It was organized by point-to-multipoint RSVP-TE. Also, it was driven by service provider conditions to deport broadband video over MPLS. Since the beginning of RFC 4875, there has been a tremendous swell in concern and deployment of MPLS multicast and this has commenced to various new developments both in the IETF and in transportation products.

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Q.32 Explain the quality of service.

The (QoS) Quality of service refers to many relevant features of telephony and computer systems that support the transportation of traffic with special demands. Indistinct, much technology has been increased to provide computer networks to become as valuable as telephone systems for audio conversations, also maintaining new applications with even more stringent service demands.

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Q.33 State the difference between the IntServ and DiffServ

(“IntServ”) Integrated services implement the parameterized method. In this model, applications practice the (RSVP) Resource Reservation Protocol to inquire and reserve resources by a network. (“DiffServ”) Differentiated services implement the prioritized form. DiffServ marks packages according to the kind of service they want. In reply to these markings, routers and switches use different queuing methods to tailor a performance to expectations. (DSCP) DiffServ Code Point markings utilize the first 6 bits in the ToS field of the IP(v4) packet header.

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Q.34 Explain Operations support systems.

Operations support systems (which is also known as operational support systems or OSS) are computer systems utilized by telecommunications service providers. The term most commonly represents "network systems” trading with the telecom network itself, maintaining methods such as provisioning services, maintaining network inventory, configuring network components, and handling faults.

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Q.35 What application areas do the Operations support systems involve?

Service delivery Network management systems Service fulfillment, involving the network inventory, activation, and provisioning Service assurance Customer care

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Q.36 Define Network management.

Network management pertains to the methods, activities, methods, and devices that concern the administration, maintenance, operation, and provisioning of networked systems.

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Q.37 What is the difference between Fdm And Tdm in Wimax?

TDM is applied in PCM transmission to get T1 at the rate of 1.544Mbps. FDM is exercised in satellite, Radio, HF, and additional wireless technologies. Both TDM and FDM are applied in GSM cellular technology.

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Q.38 Name 4-layer model of TMN applicable within an OSS.

Business Management Level (BML) Network Management Level (NML) Service Management Level (SML) Element Management Level (EML)

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Q.39 State some issues of network and service management.

A big issue of network and service management is the capacity to maintain and constrain the network components of the access and center networks. Historically, various efforts have been employed in standardization for (ITU-T, 3GPP) in a position to establish a standard protocol for network administrators, but with no conclusion and practical results.

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Q.40 State the advantages of OFDM in Wimax.

Frequency discriminating fading will be capable to affect a few of the subchannels/subcarriers and not the entire band. OFDM overcomes the effect of ISI occurring chiefly in multipath channel environments.

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Q.41 Describe Rng Req In Wimax.

RNG REQ is transferred by SS to BS. After completing Synchronization (Time, Channel, Freq) RNG REQ Architecture is decoded to bits at BS. Type field just after GMH will define message prototype which is '0x04' for RNG REQ, which tells BS what needs to be completed after accepting the message.

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Q.42 What are Wimax Ranging procedures?

I would like to list some WiMAX ranging methods: Initial Ranging Contention Ranging Periodic Ranging Non-Contention Ranging

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Q.43 Explain Non-contention Raging Procedure In Wimax.

Non-contention raging is controlled by the BS to support the SS to complete system access ahead when the dedicated channel is given and polled primary ranging.

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Q.44 What do you understand by Software integration?

Software integration is the method of linking various computing systems and software applications manually or functionally together. The software integrator brings collectively discrete systems utilizing a mixture of techniques like enterprise application integration, computer networking, business process management, or manual programming.

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Q.45 List some examples of communications services/products.

Some of the instances of communications services /products are: Voice – Basic telephony, Local Access, Contact Center, toll-free, long-distance, Voice over IP (VoIP), etc. Internet Protocol (IP) – Contact Center, Internet Access, VPN, VoIP, Remote Access, etc. Hosting – Disaster Recovery, Custom Application Environments, Managed Services like security and network services, storage, Web Site Hosting, etc.

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Q.46 Define Initial Raging procedure In Wimax.

Initial raging takes accurate transmission parameters (Timing offset estimation, Power adjustment, and synchronization) to interact with the BS.

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Q.47 Explain Order Fulfillment functions.

Order Fulfillment functions are a crucial set of actions implemented in series to meet customer orders for services in a (CSP) Communications Service Provider environment. After order entry, validation, and submission, orders are disintegrated and posted for provisioning. Upon meeting the decayed orders and appropriate measurement of the circuits, the orders are placed into inventory.

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Q.48 Define Service Provisioning system.

Service Provisioning systems are systems utilized to set up services/products for the consumer after an application for the services has been designed and received by the CSP.

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Q.49 Who authored the 802.16 series of standards?

IEEE 802.16 is a series of wireless broadband standards written by the Institute of Electrical and Electronics Engineers (IEEE). 

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Q.50 Who tests the equipment for WiMax for compliance?

WiMAX forum tests the equipment for WiMax for compliance.

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Q.51 Which standards governs WLAN?

802.11

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Q.52 How much the microwave spectrum for 802.16 extends up to?

66GHz

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Q.53 What is the major advantage of 802.16 based broadband access?

Mobility is the major advantage of 802.16 based broadband access.

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