Here I write on article How Wimax works and on wimax terminology
Which is better AAC or SBC? Comparing AAC and SBC Codecs When it comes to audio quality, AAC and SBC are two commonly used codecs, each with its strengths and weaknesses. Let’s explore the differences between AAC and SBC and determine which one offers superior audio quality. AAC Codec AAC, or Advanced Audio Coding, is … Read more
Mobile WiMAX frame structure Unlike Fixed WiMAX, which uses OFDM frames, Mobile WiMAX uses OFDMA frames. OFDMA allows multiple users to receive data from the base station at the same time. In this type of system, the downlink bursts from the base station are divided by a time offset and a frequency offset (sub-channel offset). … Read more
WiMAX antennas, just like the antennas for car radio, cell phone, FM radio, or TV, are designed to optimize performance for a given application. The figure above illustrates the three main types of antennas used in WiMAX deployments. From top to bottom are an omni directional, sector and panel antenna each has a specific function. … Read more
Naturally, the first application for which a wireless alternative was developed and deployed was voice telephony. These systems, called wireless local-loop (WLL), were quite successful in developing countries such as China, India, Indonesia, Brazil, and Russia, whose high demand for basic telephone services could not be served using existing infrastructure. In fact, WLL systems based … Read more
The MAC layer is oriented to the connections. Each connection corresponds to a service flow. The service flow defines the QoS parameters of PDU transmitted over the connection. The design core of the MAC protocol is the concept of service flow architecture on the connection. The service flow provides an uplink/downlink QoS management mechanism. An … Read more
Sub-Carrier Allocation Mode 1 DL PUSC – Downlink partial Usage Sub-Channels The downlink PUSC replacement zone is unique, that must exist in the frame structure specified by the protocols. DL PUSC with all SC – PUSC with all sc indicates the PUSC replacement mode when all the bandwidth resources are used. DL FUSC- Downlink Full … Read more
Transmitting: The process is similar to that of BS. The frequency offset is pre-corrected. The Ranging and BW Request are generated at the physical layer and a code is selected according to the indication at the MAC layer. After the modulation, they are mapped to competitive slots selected at the MAC layer. Later, they are … Read more
Transmitting: After being processed at the MAC layer, the downlink data is sent to the physical layer inthe format of MAC PDU. The MAC PDU arranges the data block size according to the allocation results of radio resources at the MAC layer. After the data packets are processed through the channel coding, modulation, and IFFT … Read more
In the context of WiMAX (Worldwide Interoperability for Microwave Access), NAP and NSP are important entities that play crucial roles in providing wireless broadband services. What is NAP & NSP in Wimax ? How it Works ? Let’s delve into what NAP and NSP stand for, and how they work together within the WiMAX ecosystem. … Read more
CSN – Core Service Network. Definition It is a combination of a set of network functions and provides IPconnections for the WiMAX subscribers. The CSN consists of the router,AAA agent or server, subscriber database, and Internet gateway equipment. The CSN can a new network entity in a new WiMAX system or can realize the functions … Read more