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Hetnet

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Hetnet

Publicada em: Tecnologia

Hetnet

  1. 1. HETNET
  2. 2. Introduction • Heterogeneous is the characteristic of containing dissimilar constituents. • A common use of this word in information technology is to describe a product as able to contain or be part of a "heterogeneous network," consisting of different manufacturers' products that can "interoperate." • Heterogeneous networks are made possible by standards- conforming hardware and software interfaces used in common by different products, thus allowing them to communicate with each other. • The Internet itself is an example of a heterogeneous network.
  3. 3. Introduction • Mobile experts define a HetNet as a network with complex interoperation between macrocell, small cell, and in some cases WiFi network elements used together to provide a mosaic of coverage, with handoff capability between network elements
  4. 4. HETNET is not a distinct network • HETNET is not a distinct network by itself- it is a gradual evolution of cellular topology. • The term “heterogeneous” implies that various types of networks like wifi, home and public femtocells, picocells and microcells will be implemented in different levels of network hierarchy but all of them will eventually come together to form a larger network as a whole.
  5. 5. Cellular networks • Cellular networks are formed with three main components: Base stations (BSs), Mobile telephone switching offices (MTSO) and mobile devices. • A radio transceiver and controller is put on each base station to provide radio communication to the mobile units located in its cell
  6. 6. Macro Cell • A macrocell is a cell in a mobile phone network that provides radio coverage served by a high power cellular base station (tower). • The term macrocell is used to describe the widest range of cell sizes. Macrocells are found in rural areas or along highways. • The antennas for macrocells are mounted on ground-based masts, rooftops and other existing structures, at a height that provides a clear view over the surrounding buildings and terrain. • Macrocell base stations have high power outputs .
  7. 7. Picocell • A picocell is a small cellular base station typically covering a small area, such as in-building (offices, shopping malls, train stations, stock exchanges, etc.), or more recently in- aircraft. • In cellular networks, picocells are typically used to extend coverage to indoor areas where outdoor signals do not reach well, or to add network capacity in areas with very dense phone usage, such as train stations or stadiums. • Picocells provide coverage and capacity in areas difficult or expensive to reach using the more traditional macrocell approach.
  8. 8. Capacity vs. Coverage
  9. 9. Hetnet Network Elements
  10. 10. Hetnet Issues • HANDOVER ISSUE: Smooth handover between different systems should be taken as a basic requirement. Multiple authentications taken by various systems are annoyed. • How to keep service continuity during handover across different systems is an issue. Increased handovers due to small cell sizes introduce a potential source of increased Dropped Call Rate (DCR)
  11. 11. Handover
  12. 12. Thank You

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