01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
Transcript of 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
1/15
AllRights
ReservedAlvarion200
7
ver. 07-06-10 Alvarion Training Services
00
6/3/2008
Access SystemsAccess Systems11
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
2/15
AllRightsReservedAlvarion200
7
ver. 07-06-10 Alvarion Training Services
Overall Diagram
The System is designed to transfer information from its point ofgeneration (the user) to the first node of the (transport) network.
1
Network Access Systemuser
user
user
user
user
user
Transport
Network
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
3/15
AllRightsReservedAlvarion200
7
ver. 07-06-10 Alvarion Training Services
Point to Multipoint Architecture2
WAN
(Internet / Intranet)
NetworkAccessSystem
NetworkAccessSystem
userLAN
user
user
user
userLAN
user
long(er) distances short distances
high capacity medium capacityQoS mandatory QoS not mandatory
licensed frequency bands(unlicensed also applicable)
unlicensed frequency bands
scheduled access contention based access
IEEE 802.16 IEEE 802.11
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
4/15
AllRightsReservedAlvarion200
7
ver. 07-06-10 Alvarion Training Services
Overall Diagram3
Indoor
Indoor
PSTN
Internet
Gateway
(GW)
Gatekeeper
(GK)
Router
(R)
servers
SNMP
mgr
Indoor
PCPC
Hub / Switch / Router
VoIPGateway
PC
PCPC
WirelessVoIP
Gateway
PC
Wireless
Hub / Switch / Router
Wired / Wireless
Wired / Wireless
Indoor
PCPC
VoIPGateway
PC
Wireless
Hub / Switch / Router
Wired / Wireless
100/1000MbpsEthe
rnetswitch
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
5/15
AllRightsReservedAlvarion200
7
ver. 07-06-10 Alvarion Training Services
BWA Concepts (IEEE 802.16)
Traffic is generated as Service Flows (SF)
Service Flow is a flow of packets to which specific QoS level is guaranteedService Flows and their associated QoS parameters are defined before the operation of thenetwork, but can also be modified, added or deleted during operation
Packets are identified as belonging to a specific Service Flow based on the Connection Identifier(CID)
CID is used by Subscriber Stations (SS) to request uplink bandwidth grants from the Base
Station (BS)
4
WAN
(Internet / Intranet)userLAN
user
user
user
userLAN
user
BaseStation
(BS)
SubscriberStation
(SS)
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
6/15
AllRightsReservedAlvarion200
7
ver. 07-06-10 Alvarion Training Services
BWA Concepts (IEEE 802.16)
Four different types of bandwidth grants are defined:
Continuous Grant (CG)
For real time services like E1, VOIP (without silence suppression)
Fixed size data packets on a periodic basis
Service parameters: unsolicited grant size, normal grant interval
Real Time Variable Rate (RT-VR)
For real time services like MPEG video
Variable bit rates
Guaranteed rate and delay requirement
Service parameters: committed burst (CIR), polling time interval (CT)Non Real Time Variable Rate (NRT-VR)
Variable bit rate services
Guaranteed rate required, guaranteed delay not required
Service may expand to occupy full bandwidth rate limit required
Service parameters: committed burst, polling time interval, excess burst (MIR)Best Effort (BE)
For service with no rate or delay requirements
Service parameters: polling time interval, excess burst
5
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
7/15
AllRightsReservedAlvarion200
7
ver. 07-06-10 Alvarion Training Services
BWA Concept (BreezeMax)
Committed Time (CT)
The AU polls each SU about the BW they are required, the time interval between two polls isthe CT (divided by two)
CT is the time period where the configured BW (CIR or MIR) is measured
6
Long Medium Short
CG* > 60 msec 40 - 60 msec 20 - 40 msec
RT 200 msec 100 msec 50 msec
NRT 200 msec 100 msec 50 msec
BE 200 msec 100 msec 50 msec
* Defined automatically when the grant interval is configured.
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
8/15
AllRightsReservedAlvarion2007
ver. 07-06-10 Alvarion Training Services
BWA Concepts (IEEE 802.16)
Actual bandwidth grants to CIDs is executed by BS through the allocation of time slots fortransmission to the selected CIDs
Network time is divided into frames (of several ms)
Every downlink frame opens with a DL map followed by a UL map transmitted by BS to all SS
The maps indicate the activity to be executed by BS and SS during the frame
7
DL BurstsUCDDCDUL MAPDL MAPPreamble
X msec (5 msec in BreezeMAX)
UL Bursts
DL BurstsUCDDCDUL MAPDL MAPPreamble
UL Bursts
Half duplex operation
Full duplex operation
DL UL
DL
UL
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
9/15
AllRight
sReservedAlvarion2007
ver. 07-06-10 Alvarion Training Services
BWA Concepts (IEEE 802.16)
DL MAP indicates:
CIDs to which BS will transmit (downlink) during the following frame
The exact moment in time when the transmission will occur
UL MAP indicates:CIDs that have to transmit (uplink) during the next frame
The exact moment in time when the transmission has to occur
The type of information to be transmitted during the allocated interval (data, management,requests to transmit in the next frame, etc.)
8
DL
X msec (5 msec in BreezeMAX)
DL
X msec (5 msec in BreezeMAX)
DL BurstsUCDDCDUL MAPDL MAPPreamble
DL BurstsUCDDCDUL MAPDL MAPPreamble
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
10/15
AllRight
sReservedAlvarion2007
ver. 07-06-10 Alvarion Training Services
BWA Concepts (IEEE 802.16)
DCD (Downlink Channel Descriptor) indicates:
The physical parameters to be used by BS for each CID (modulation type, FEC codingrate, etc.)
UCD (Uplink Channel Descriptor) indicates:
The physical parameters to be used by each CID when transmitting to BS(modulation type, FEC coding rate, etc.)
9
DL
X msec (5 msec in BreezeMAX)
DL
X msec (5 msec in BreezeMAX)
DL BurstsUCDDCDUL MAPDL MAPPreamble
DL BurstsUCDDCDUL MAPDL MAPPreamble
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
11/15
AllRight
sReservedAlvarion2007
ver. 07-06-10 Alvarion Training Services
IEEE 802.16 Structure10
Common MAC
MAC
PHY
Common MAC, Several PHYs
2-11 GHzOFDMA PHY
2-11 GHzOFDM PHY
2-11 GHzSCa PHY
11-66 GHzSC PHY
OFDM Specific MACFeatures
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
12/15
AllRightsReservedAlvarion2007
ver. 07-06-10 Alvarion Training Services
Frame Format11
MAC PDU
MAC Payload
EC0
Header
Type
LENCIRsv EKS Rsv
LEN - Cont.
CID
CID - Cont.
HCS
CRC
Format ofthe message
Length
Connection ID
Data / Management
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
13/15
AllRightsReservedAlvarion2007
ver. 07-06-10 Alvarion Training Services
Frame Format12
MAC PDU
EC
Header
Type
BRCIRsv EKS Rsv
BR- Cont.
CID
CID - Cont.
Amount of datarequested to Tx
Connection ID
Bandwidth Request
1
Format ofthe message
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
14/15
AllRightsReservedAlvarion2007
ver. 07-06-10 Alvarion Training Services
13 Typical Application
-
8/6/2019 01 - BreezeMAX - BWA concepts -(ver. 07-06-10) - ver. 2.0
15/15
Copyright Alvarion Ltd.Alvarion Training Services
Thank You