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IEEE 802.16Wireless MAN
"Air Interface for Fixed Broadband Wireless Access Systems"
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Outline
Introduction Physical Layer MAC Layer QoS
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Introduction Physical Layer MAC Layer QoS
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Introduction (1)
Goal: Provide high-speed Internett access to home and business subscribers, without wires.
Base stations (BS) can handle thousands of subscriber stations (SS)
Access control prevents collisions. Supports
Legacy voice systems Voice over IP TCP/IP Applications with different QoS requirements.
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Introduction (2) 802.16 standards:
802.16.1 (10-66 GHz, line-of-sight, up to 134Mbit/s)
802.16.2 (minimizing interference between coexisting WMANs.)
802.16a (2-11 Ghz, Mesh, non-line-of- sigth)
802.16b (5-6 Ghz) 802.16c (detailed system profiles) P802.16e (Mobile Wireless MAN)
Will focus on 802.16.1
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Introduction Physical Layer MAC Layer QoS
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Physical layer (1)
”Burst single-carrier” modulation Allows use of directional antennas Allows use of two different duplexing
schemes: Frequency Division Duplexing (FDD) Time Division Duplexing (TDD)
Support for both full and half duplex stations
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Time Division Duplexing (TDD)
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Frequency Division Duplexing (FDD)
Figure 7.4, page 123
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Physical layer (2) Adaptive Data Burst Profiles
Transmission parameters (e.g. modulation and FEC settings) can be modified on a frame-by-frame basis for each SS.
Profiles are identified by ”Interval Usage Code” (DIUC and UIUC)
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Physical Layer (3) Using both
TDM (Time Division Multiplexing) and TDMA (Time Division Multiple Access)
What is the difference, you ask.. I have no idea, But each TDMA burst is preceded by a preamble
TDM TDMA
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Introduction Physical Layer
MAC Layer QoS
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Media Acces Control (MAC) Connection orienteded
Connection ID (CID), Service Flows(FS)
Channel access: UL-MAP
Defines uplink channel access Defines uplink data burst profiles
DL-MAP Defines downlink data burst profiles
UL-MAP and DL-MAP are both transmitted in the beginning of each downlink subframe (FDD and TDD).
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TDD Downlink subframe
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FDD burst framing
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FDD Downlink subframe
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Uplink subframe
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Upplink periods Initial Maintenance opportunities
Ranging To determine network delay and to request power or
profile changes. Collisions may occur in this interval
Request opportunities SSs request bandwith in response to polling from BS. Collisions may occur in this interval aswell.
Data grants period SSs transmit data bursts in the intervals granted by
the BS. Transition gaps between data intervals for
synchronization purposes.
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Bandwidth request and allocation (1)
SSs may request bw in 3 ways: Use the ”contention request opportunities”
interval upon being polled by the BS (multicast or broadcast poll).
Send a standalone MAC message called ”BW request” in an allready granted slot.
Piggyback a BW request message on a data packet.
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Bandwidth request and allocation (2)
BS grants/allocates bandwidth in one of two modes:
Grant Per Subscriber Station (GPSS) Grant Per Connection (GPC)
Decision based on requested bw and QoS requirements vs available resources.
Grants are realized through the UL-MAP.
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Unicast Polling
1. BS allocates space for the SS in the uplink subframe.
2. SS uses the allocated space to send a bw request.
3. BS allocates the requested space for the SS (if available).
4. SS uses allocated space to send data.
Poll(UL-MAP)
RequestAlloc(UL-MAP)
Data
BS SS
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4 types of Scheduling Service Unsolicited Grant Service (UGS)
Real-time, periodic fixed size packets (e.g. T1 or VoIP) Restrictions on bw requests (Poll-Me bit) Slip Indicator (SI)
Real-Time Polling Service (rtPS) Real-time, periodic variable sizes packets (e.g MPEG) BS issues periodic unicast polls. Cannot use contention requests, but piggybacking is ok.
Non-Real-Time Polling Service (nrtPS) Variable sized packets with loose delay requirements (e.g.
FTP) BS issues unicast polls regularly (not necessarily periodic). Can also use contention requests and piggybacking.
Best Effort Service Never polled individually Can use contention requests and piggybacking
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Scheduling types
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Introduction Physical Layer MAC Layer
QoS
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The QoS Object Model
Scheduling type
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QoS mechanisms
Classification Mapping from MAC SDU fields (e.g destination IP
address or TOS field) to CID and SFID
Scheduling Downlink scheduling module
Simple, all queues in BS Uplink scheduling module
Queues are distributed among SSs. Queue states and QoS requirements are
obtained through BW requests. Algorithms not defined in standard
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Summary of the 802.16 QoS architecture
Figure 7.13, Page 137
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Keywords on the 802.16a extension
Mesh topology Line-of-sight not required 2-11 GHz ARQ support (Automatic repeat request)
More QoS signaling Dynamic Frequency Selection, to
avoid interference with WLAN.