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IEEE 802.16e/Mobile WiMAX. Moise Effo. IEEE 802.16 Overview. IEEE 802.16e Protocol Stack. Network architecture. PHYSICAL Layer Description.

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IEEE 802.16e/Mobile WiMAX

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physical layer description
PHYSICAL Layer Description
  • The Mobile Wimax adopts Orthogonal Frequency Division Multiple Access (OFDMA) for improved multi-path performance in non-line-of-sight environments by:
  • Multiplexing operation of data streams from multiple users
  • Dynamically assign a subset of sub-channels to individual users.
  • Scalable OFDMA (SOFDMA) is introduced in the IEEE 802.16e an amendment to support scalable channel bandwidths from 1.25 to 20 MHz.
  • Scalability is supported by adjusting the FFT size while fixing the sub-carrier frequency spacing at 10.94 kHz.
physical layer description1
PHYSICAL Layer Description
  • Since the resource unit sub-carrier bandwidth and symbol duration is fixed, the impact to higher layers is minimal when scaling the bandwidth.
  • 802.16e systems offer scalability in both radio access technology and network architecture, thus providing a great deal of flexibility in network deployment options and service offerings.
  • 802.16e supports TDD and Full and Half-Duplex FDD operation.
physical layer description2
PHYSICAL Layer Description
  • Adaptive modulation and coding (AMC) is the matching of the modulation, coding and  signal strength and protocol parameters to the conditions on the radio link.
  • Hybrid Automatic Repeat Request (HARQ) is a combination of high-rate forward error-correcting coding (FEC), and ARQ (Automatic Repeat-reQuest) error-control for detectable-but-uncorrectable errors.
  • Fast Channel Feedback (CQICH) is a method of communicating feedback information between a mobile station and a base station by determining a need to request bandwidth allocation.
mac layer description
MAC Layer Description

Quality of service (QoS) is provided via service flows. This is a unidirectional flow of packets that is provided with a particular set of QoS parameters

mac layer description1
MAC Layer Description
  • Scheduling service is designed to efficiently deliver broadband data services including voice, data, and video over time-varying broadband wireless channel. The MAC scheduling service has the following properties that enable the broadband data service:
  • Fast Data Scheduler
  • Scheduling for both DL and UL
  • Dynamic Resource Allocation
  • QoS Oriented
  • Frequency Selective Scheduling
mac layer description2
MAC Layer Description
  • Mobility management
  • Power management Mobile Wimax supports the two modes for power efficient operation:
  • - Sleep Mode
  • - Idle Mode
  • Handoff there are handoffs methods supported by the mobile Wimax:
  • - Hard Handoff (HHO)
  • - Fast Base Station Switching (FBSS)
  • - Macro Diversity Handover (MDHO)
mac layer description3
MAC Layer Description
  • Security
    • Key Management Protocol for Traffic Encryption Control, Handoff Key Exchange and Multicast/Broadcast security messages.
    • Device/User Authentication by providing support for credential that are SIM-based.
    • Traffic Encryption, a cipher is used for the protection all the user data over the Mobil Wimax MAC interface. (AES-CCM)
    • Control Message Protection using AES Based CMAC.
    • Fast Handover Support there is a 3-way Handshake scheme to optimize the re-authentication mechanisms for fast handovers.
advanced features of mobile wimax
Advanced features of mobile wimax
  • Smart antenna technologies:
  • typically involve complex vector or matrix operations on signals due to multiple antennas. OFDMA allows smart antenna operations to be performed on vector-flat sub-carriers. Complex equalizers are not required to compensate for frequency selective fading.
  • Mobile Wimax supports a full range of smart antenna technologies to enhance system performance.
  • Beamformingfor a better coverage and capacity of the system and reduce outage probability.
  • Space-Time Code(STC) transmit diversity codes are used to provide spatial diversity and reduce fade margin.
advanced features of mobile wimax1
Advanced features of mobile wimax
  • Smart antenna technologies
  • Spatial Multiplexing(SM) is to take advantage of higher peak rates and increases throughput.
  • multiple streams are transmitted over multiple antennas
  • both receiver and transmitter must have multiple antennas to achieve higher throughput.

The inclusion of MIMO antenna techniques along with flexible sub-channelization schemes, Advanced Coding and Modulation all enable the802.16e technology to support a high data rate:

•peak DL data rates up to 63 Mbps per sector and

•peak UL data rates up to 28 Mbps per sector

in a 10 MHz channel.

advanced features of mobile wimax2
Advanced features of mobile wimax
  • Fractional Frequency reuse
  • All cells/sectors operate on the same frequency channel to maximize spectral efficiency.
  • Users operate on sub-channels, which only occupy a small fraction of the whole channel bandwidth
  • The flexible sub-channel reuse is facilitated by sub-channel segmentation and permutation zone
advanced features of mobile wimax3
Advanced features of mobile wimax
  • Multicast and Broadcast Service (MBS)
  • combines the best features of DVB-H, MediaFLO and 3GPP
  • E-UTRA and satisfies the following requirements:
  • High data rate and coverage using a Single Frequency Network (SFN)
  • Flexible allocation of radio resources
  • Low MS power consumption
  • Support of data-casting in addition to audio and video streams
  • Low channel switching time
key advantages of mobile wimax
Key advantages of Mobile WIMAX
  • Tolerance to Multipath and Self-Interference
  • Scalable Channel Bandwidth
  • Orthogonal Uplink Multiple Access
  • Support for Spectrally-Efficient TDD
  • Frequency-Selective Scheduling
  • Fractional Frequency Reuse
  • Fine Quality of Service (QoS)
  • Advanced Antenna Technology

Mobile Wimax can be considered as a real competitor for 3G for example in IP-traffic(VoIP/ IPTV).

Mobile Wimax supports seamless handoff which provides switching between base stations in vehicular speeds.

Mobile Wimax uses Scalable OFDMA multiplexing which maximizes the spectral efficiency.