wibro overview
TRANSCRIPT
Telecommunications Technology AssociationIMT WiBro Project Group(PG702)
WiBroTM Overview
April 2008
B Team - Mobile Portal Business
Contents
WiBro overviewII
Korea StandardizationIIII
IEEE802.16 & WiMAXIIIIII
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WiBro overviewPART IPART I
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Portable Internet Service (WiBro) is to provide a high data rate wireless internet access with PSS (Personal Subscriber Station) under the stationary or mobile environment, anytime and anywhere.
DefinitionDefinition
『 Portable Internet 』 was named as 『 WiBro 』 . (End of April, 2004) WiBro : Wireless Broadband
ReferenceReference
I. WiBro - Definition
WiBroWiBro
Low Cost Anytime,Anywhere
Mobility HighData Rate
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Internet Access
High Data Rate
Anytime, Anywhere
Stationary or Mobile
• Stationary/Mobile• mid-mobility (~60Km/Hr)
• Indoor/outdoor• Seamless access
• over 1Mbps• High-speed Multimedia
• User Terminal : Notebook, PDA, Handset
Definition
Concept
Much lower service charges than EV-DO Much higher-speed Internet access than EV-DOMobile Internet access in high-speed mobile environmentMuch wider coverage than wireless LAN-based services
I. WiBro - Definition
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WLLFixed
High Mobility
IMT2000(3G)
MobilityMobility
2.4GHz Wireless LAN
WiBro
User Data Rate
ADSL/HFC/B-WLL
The next Generation Multimedia Service
Cellular PCS(2G)
II. WiBro - Positioning
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1.92 1.98 2.11 2.17 2.30 2.33 2.37 2.40 2.4835 5.725 5.825 [ GHz]
40MHzHTIHTI(20)(20)
2.4GHz2.4GHz(83.5)(83.5)
5.8GHz5.8GHz(100)(100)
AA(20)(20) BB CC 130MHz AA BB CC KK
TT HTIHTIKKTT
IMT2000 WLL ISM ISMISM
KTKT(UP)(UP)
2.30 2.31 2.33 2.37 2.38 2.40 [ GHz]
HTiHTi(UP)(UP) GUARD BAND KTKT
(DOWN)(DOWN)HTiHTi
(DOWN)(DOWN)
10MHz 20MHz 40MHz 10MHz 20MHz
WLL
WiBro
1FA=9MHz
2300MHz 2400MHzBand 1(SKT) Band 2(KT) Band 3(TBD)
Guardband=4.5MHz Guardband=10MHz
Fixed & Mobile
Fixed
III. WiBro – Frequency Allocation
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IV. Key Factors of WiBroMajor DecisionMajor Decision
The TTA PG702 Meeting of Jan 31, 2004 approved the Major System Parameters & Radio Access Requirements as follows.
TTA changed Standardization committee name from PG302 to PG702 according to reorganization of TTA standardization committee (Dec. 2007)
Major SystemMajor SystemParametersParameters Radio Access RequirementRadio Access Requirement
TDDTDD Frequency Reuse Frequency Reuse FactorFactor
DuplexingDuplexing 11
OFDMAOFDMAMultipleMultipleAccessAccess
8.75 [MHz]8.75 [MHz]ChannelChannelBWBW
MobilityMobility ≤ ≤ 60 [Km/h]60 [Km/h]
Service CoverageService Coverage ≤≤ 1 [Km]1 [Km]
Spectral EfficiencySpectral Efficiency[bps/Hz/cell(sector)][bps/Hz/cell(sector)]
Max. DL / UL = 6 / 2Max. DL / UL = 6 / 2Aver. DL / UL = 2 / 1 Aver. DL / UL = 2 / 1
HandoffHandoff ≤≤ 150 [ms]150 [ms]
ThroughputThroughput(per user)(per user)
Max. DL / UL = 3 / 1 [Mbps]Max. DL / UL = 3 / 1 [Mbps]Min. DL / UL = 512 / 128 [Kbps]Min. DL / UL = 512 / 128 [Kbps]
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V. Network Architecture of WiBroNetwork Architecture of WiBroNetwork Architecture of WiBro
ACR : Access Control RouterACR : Access Control Router
RAS : Radio Access StationRAS : Radio Access Station
PSS : Personal Subscriber StationPSS : Personal Subscriber Station
PSS
HA
RAS
PSS
ACR
AAA
Public IP Network
ACR
PSS
Operator’sIP Network
PSS
RASRASRAS
……
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VI. WiBro Business in Korea
3 Operators are selected at February 2005. KT, SKT, (TBD)
OperatorsOperators
27 MHz per operator Band#1 : 2300 ~ 2327MHz (SKT) Band#2 : 2331.5 ~ 2358.5 MHz (KT) Band#3 : 2363 ~ 2390 MHz
FrequenciesFrequencies
Trial Service during 1Q of 2006. Launching Commercial Service : June 30, 2006 StatusStatus
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Korea StandardizationPART PART IIII
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I. Committee Structure & ToR of PG702
* ToR : Terms of Reference
Radio AccessWorking Group
IMT WiBro Project Group
(PG702)
Service and NetworkWorking Group
International Coordination
Ad Hoc
Radio Access Standardization on IMT WiBro
Radio Access Standardization for In-building WiBro
International Coordination and Collaboration Activities (IEEE 802.16 and ITU-R WP5D, etc.)
Standardization related to Service and Network on IMT WiBro
International Coordination and Collaboration activities related to Service and Network on IMT WiBro
International Coordination Activities related to IMT WiBro (IEEE 802.16, ITU-R WP5D, WiMAX, CJK and TTA PG701, etc.)
Analysis of International Standardization and Progress related to IMT WiBro
IOT/CT Working Group
Standardization of Profiling, Interoperability and Conformance Test on IMT WiBro
Coordination and Collaboration activity with WiMAX Forum
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Radio Access Standardization for WiBroPurpose: Revision of WiBro standard in order to harmonize with IEEE802.16Status: Adopted WiBro Phase2 Standard (TTAS.KO-06.0082/R1,Dec.2005)
It is a subset of IEEE802.16 Profiles
Service & Network Standardization for WiBro
Purpose: To complete Service requirements and network reference model of WiBro. & To complete Specifications for interoperability between WiBro and other network such as WLAN, 3G, DMB, etc.
Status: TTAR-0017(2.3GHz Portable Internet-Service/Network requirements)TTAR-0018(2.3GHz Portable Internet-Network Reference Model)Working requirements for interoperability between WiBro and other network such as WLAN, 3G etc.
II. TTA PG702 Activities for WiBro Standardization (until now-1)
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Purpose: To guarantee interoperability between WiBro equipments/ between WiBro service carriers
StatusTTA adopted IOT/CT Standard at Dec. 2005. and then, in order to harmonize between WiBro and Mobile-WiMAX, IOT/CT Standards is being revisedWe hope that WiBro equipments get the first Mobile-WiMAX certification.
IOT/RCT Standard for WiBro
PISIM (WiBro Subscriber Identity Module) Standard
Purpose: Apply function on Subscriber Identity module to WiBro
Status Adopted Mutual Authentication Standard(TTAS.KO-06.0110/R1, June.2006) Registered RID (Registered Application Provider Identifier) for WiBro
service to ISO
II. TTA PG702 Activities for WiBro Standardization (until now-2)
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Definition of Service and System Requirements for enhanced
WiBro
Study on adaptation of MMR
Requirements for interworking between WiBroTM and others
IPR and international cooperation activities
Study on further enhancements of WiBroTM standard
Revision of IOT/RCT spec.
Etc.
III. Future Plan of PG702 (1)
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TTA PG702 will follow the plan for IMT-Advanced specification
through consensus building and collaboration with other SDOs.
20082008 2009200920072007 20102010
Evaluation onOFDMA TDD WMAN
Study onWiBro Evolution and additional Standardization
for IMT-Advanced
CONSENSUS BUILDING /Collaboration
with , etc.CJKCJK
III. Future Plan of PG702 (2)
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IEEE802.16 and WiMAXIIIIII
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I. IEEE802.16 Body
Working Group on Broadband Wireless Access Chair : Roger B. Marks (NIST)
Task GroupTGe* : enhancement to support mobility (session closed)
Maint* : corrigendum to IEEE std802.16-2004TGh : amendment for license-exempt optionsTGc : amendment for conformance testTGf/g : MIB and Management Plane proceduresMMR SG : Mobile Multihop Relay
* TTA PG302 works for harmonization with TGe and Maint
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II. Closing of 802.16 TGe
IEEE 802. 16 e Sponsor Ballot
2005
IEEE 802.16 Maint
Sponsor Group Ballot
11 33 55 77 99 1111
Publish
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Fixed Wireless (TGd)IEEE Std 802.16-2004 : published on Oct. 1, 2004As a revision of IEEE Standard 802.16-2001 (as amended by IEEE Standard 802.16c-2002, and IEEE Standard 802.16a-2003).
Mobility Support Enhancement (TGe)IEEE Std 802.16e-2005 : Published on Feb. 28, 2006(including 802.16-2004/Cor1)P802.16e standard approved by IEEE-SA on Dec. 7, 2005. - Amendment for Physical and Medium Access Control Layers for
Combined Fixed and Mobile Operation in Licensed Bands below 6 GHz
WiBro Specification = Subset of Consolidated version of “IEEE Std. 802.16-2004 + P802.16e +P802.16-2004/Cor1.”
III. WiBro and IEEE 802.16
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Relationship between WiBro and IEEE 802.16.
IEEE Standard 802.16-2004(SC, SCa, OFDM, OFDMA PHY mode with Single IEEE 802.16 MAC)
IEEE P802.16-2004/Cor1(To correct errors, inconsistencies, and ambiguities in IEEE Standard 802.16-2004)
IEEE P802.16e(Combined Fixed and Mobile Operation in Licensed Bands below 6 GHz)
WiBro (Complete Subset of IEEE 802.16)•Should support the IEEE Standard 802.16-2004 and IEEE P802.16e and provide the 5 criteria (TDD, FRF=1, 60km/hr mobility support, FA >= 9 MHz, roaming between operators, etc)•Shall support the Mandatory Features of IEEE 802.16.•WiBro Profile = the set of functionalities configuring every mandatory features and many optional features of 802.16e. • WiBro Air Interface Specification is fully compatible with IEEE P802.16e•WiBro Profiles and Test Specifications will be harmonized with WiMAX Forum’s currently developing Mobile WiMAX Profiles and Test Specifications. (Most of the major manufacturers are participating as the active members of WiBro and WiMAX.)
IV. Relationship between WiBro and IEEE 802.16
* FRF : Frequency Reuse Factor* FRF : Frequency Reuse Factor
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V. IEEE 802.16 Specifications
IEEE 802.16 MAC
WirelessMAN-SC
(TDD/FDD)
WirelessMAN-SCa
(TDD/FDD)
WirelessMAN-OFDM
(TDD/FDD)
WirelessMAN-OFDMA
(TDD/FDD)
WirelessHUMAN
(TDD)
10-66 GHz below 11 GHzlicensed bands
below 11 GHzlicensed bands
below 11 GHzlicensed bands
below 11 GHzlicense-exempt bands
AAS, ARQ,STC, Mobile
AAS, ARQ,Mesh, STC, Mobile
AAS, ARQ,Mesh, STC
AAS, ARQ,STC, Mobile
AASSector
DownlinkUplink
DL UL
FDD
TDD Mesh
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VI. WiMAX Forum
Scope Promote use of BWA products support 802.16 standard
Interoperability of all products support 802.16 standardPropose and promote access profiles for .16 standardCertify interoperability levels in network and cell
Board of Directors (13 Prs. from 12 companies)President and Chair: Ron Resnick, IntelVice President: Dr. Mohammad Shakouri, Alvarion
WiMAX Forum Member Companies340 companies
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VII. WiMAX Working Group
NWG : higher level network specification for fixed, nomadic and mobile.SPWG : Feedback from Service ProvidersTWG : conformance and interoperabilityCWG : evaluation of testing options
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WiBro PHY and MACAnnexAnnex
* This Overview was produced based on a revised * This Overview was produced based on a revised version of Phase I WiBro Spec. (December 2004)version of Phase I WiBro Spec. (December 2004)
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ContentsI Introduction of PHY Specification-feature
II Parameter of WiBro specification
III Frame Structure
IV Pilot Tone
V Summary of Key Features
VI Introduction of MAC
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Supporting High spectrum efficiency
• TDD: Minimize guard-band Maximize available frequency resource
Synchronous RAS is required
• 10 MHz broadband / OFDMA
Minimized MPI Enhanced transmission efficiency
• Using CTC with QPSk/16/64 QAM modulation CTC(Convolutional Turbo Code) Enhanced transmission rate with
respect to SINR perspective
Supporting wide Coverage
• With supporting of Frequency reuse factor ‘1’
Higher spectrum efficiency and Easy deployment of RASs
Using Reed Solomon sequence based Diversity subchannel minimize other RASs interferences
In the Cell edge with bad SINR area, The operation guaranteed with Low rate FEC
• Supporting Safety Channel in order to reduce interference of the Cell edge area
I. Introduction of the PHY Specification – feature (1/3)
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I. Introduction of the PHY Specification – feature (2/3)
Performance enhancement features consider mobility
• H-ARQ
Enhanced link performance guaranteed
• For low mobility user, supporting of “the Band selection AMC subchannel” increase transmission rate and
coverage
Allocate good channel status band for each appropriate user increase the transmission rate
Terminal measure the channel status, request either the “Band selection AMC” or “Diversity” Subchannel
Diversity Subchannel is suitable to the mobile user: Maximum separated tone are allocated for frequency
diversity
• Guarantee the 60 km/h mobility
Short OFDM symbol length minimize the degradation due to the mobility
The pilot structure supporting channel estimation under mobility
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Flexible resource allocation for multiple subscriber
• TDD DL/UL duty rate
1:1, 2:1, 5:1 DL/UL duty ratios are available
• In order to support multiple subscriber scheduling algorithm
Management the status of individual terminals and packet scheduling algorithms are considered
Supporting various QoS
• Best Effort
• Real-time polling
• Non-real-time polling
Handheld support
• Supporting sleep mode reduced terminal power consumption
TDD Smart Antenna (optional feature)
• For slow mobility user, Apply the Smart Antenna increase the Coverage and TX rate
I. Introduction of the PHY Specification – feature (3/3)
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Parameter ValueDuplex TDD
Multiple Access OFDMA
System Bandwidth 10 MHz
Sampling frequency 10 MHz
Number of used tones 864 out of 1,024
Number of data tones 768
Number of pilot tones 96
Tone spacing 9.765625 kHz
Signal bandwidth 8.447 MHz
Ratio of cyclic prefix time to the basic OFDM symbol time 1/8
Basic OFDMA symbol time 102.4 s
Cyclic prefix time 12.8 s
OFDMA symbol time 115.2 s
TDD frame length 5 ms
Number of symbols in a frame 42
II. Parameters of WiBro specification (1/2)
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Downlink symbol parameter Value
Number of bands 24
Number of bins per band 4
Number of tones per bin 9 (8 data + 1 pilot tones)
Number of tones per AMC subchannel 54 (48 data + 6 pilot tones)
Number of tones per diversity subchannel 54 (48 data + 6 pilot tones)
Number of bins per AMC subchannel 6
Uplink symbol / tile parameter Value
Number of bands 24
Number of bins per band 4
Number of tones per bin 9 (8 data + 1 pilot tones)
Number of tones per tile 9 (8 data + 1 pilot tones)
Number of bins per AMC subchannel 6
Number of tiles per diversity subchannel 6
II. Parameters of WiBro specification (2/2)
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III. Frame Structure
...TTG RTG
DL UL
Band 3
Band B-2
5 ms
Band 1
Band 0
Band 2
Band B-1
BIN BIN
...
...
...
...
UL control symbols
...
...
...
...
...
TILE
......
PUSC Subchannelization
Diversity subchannelization
AMC Subchannelization AMC Subchannelization
Diversity subchannelization
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III. Frame Structure (Downlink PHY)
...
Band b-1
Bin for AMC subchannelBand b
Band b+1
...
...
...
A AA AD D A AP P A
...
... ...
Symbols
Preamble
...
...
...
...
Subcarriers forPUSC and diversity
Subchannel
D
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III. Frame Structure (Uplink PHY)
Bin
UL control symbol period
...
...
...
...
...Tile
...
Slot
...
Band 3
Band B-2
Band 1
Band 0
Band 2
Band B-1
Pilot subcarrierBin
Tile
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Rotated pilot tones
• In all the RAS/Sectors position of the pilot tone is colocated
• In each RAS/Sectors apply different PN cover is used to
differentiate each other
Supporting channel estimation for 60km/h mobility
• 2.35 GHz, 60 km/h
Doppler freq (fd)
=130.56 Hz
Coherence time(1/fd)
=7.66 ms
• DL pilot subcarrier rotation period
345.6 us <0.1* Coherence time
•Pilot sub-carrier•Data sub-carrier
time
freq
•AMC subchannel
Example for 2x3 type Bin
Organization for AMC Subchannel
IV. Pilot Tone (Downlink)
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Different pilot position for different subchannelization structure
• AMC subchannel: rotated pilot tones
• Diversity subchannel: locate in the center frequency of each tile
AMC subchannel Diversity subchannel
•allocated •pilot tone
•allocated •subchannel
•pilot tone allocated •to another terminal
IV. Pilot Tone (Uplink)
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Multiple Access/Duplexing: OFDMA/TDD
Frame length: 5 msec
Bandwidth: 10MHz with 1k-FFT
Flexible subchannelization for band selection and diversity
Fast AMC (adaptive modulation and coding) subchannel based on uplink CQI
(channel quality indicator)
Full diversity subchannel by multiple symbol grouping
Preamble for Cell differentiation with different Random sequences
X. Summary of Key Features (1/2)
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Pilot tone based downlink and uplink
Separate ranging channel time slot
Safety channel
More efficient channel coding: convolutional turbo code and short block codes
H-ARQ with CTC in the downlink and uplink
Modulation level: QPSK(DL/UL), 16QAM(DL/UL), 64QAM(DL only)
Optional AAS (adaptive antenna system) support
X. Summary of Key Features (2/2)
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- System Access- Bandwidth Allocation- Connection set-up - Connection maintenance- QoS
- Authentication- Secure key exchange- Encryption
- Transformation ofexternal network datainto MAC SDUs;
- Payload header suppression
XI. Introduction of MAC : Reference Model
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XI. Introduction of MAC : General Overview
OFDMA PDU Construction
Flexible size Header + subheader + payload + optional CRC
PDU format
MAC subheader - Fragmentation subheader - Packing subheaders - ARQ Feedback Fragmentation Construction Packing -Packing for non-ARQ connections and ARQ-enabled connections
Protocol control Optional Sequence number comparison Four transmit states ( not sent, o outstanding, discarded and waiting-for-retransmission.)
ARQ
Receiver states (CRC-32 checksum) Uplink Scheduling Scheduling (UGS, rtPS, nrtPS and BE) BW allocation
Contention based CDMA bandwidth requests
Ranging
Ranging Ranging - Initial ranging(Random Access) - Periodic ranging(Invited / Random Access) - BW request ranging(Random Access)
Ranging Subchannel and a set of special pseudo-noise Ranging Codes
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3 management connection during initial RNG-REQ/RSP exchange
Basic CID
Primary Management CIDSecondary Management CID
Traffic CID1
Traffic CID2
Management connectionBasic connection
short, time-urgent MAC message
Primary management connection
longer, more delay tolerant MAC message
Secondary management connection
delay tolerant, standards based management messages(DHCP, TFTP, SNMP)
XI. Introduction of MAC : Addressing and Connection
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Uplink Service TypesReal-time Polling Service (rtPS)
MPEG video; To support periodic variable sized data packet.
Non-real-time Polling Service (nrtPS)High bandwidth FTP; To support variable sized Data by regular basis
Best Effort Service (BE)WWW; To support Best Effort Traffic
Uplink Bandwidth Request and Allocation PolicyrtPS (real-time Polling Service)
According to polling period set service negotiation, PSS transmit bandwidth request in contention free manner or piggybacking way. QoS Parameter : the Nominal Polling Interval, the Tolerated Poll Jitter, Packet Error Rate and the Request/Transmission Policy
nrtPS (non-real-time Polling Service)During periodic or non-periodic poll, PSS transmit Bandwidth request in contention free mannerQoS Parameter : the Nominal Polling Interval, the Minimum Reserved Traffic Rate, Maximum Sustained Traffic Rate, Request/Transmission Policy, Packet Error Rate, Traffic Priority
BE (Best Effort)Contention Based or Piggybacking manner.QoS Parameter : the Minimum Reserved Traffic Rate, the Maximum Sustained Traffic Rate, Packet Error Rate, the Traffic Priority
XI. Introduction of MAC : QoS & Uplink Scheduling
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XI. Introduction of MAC : PSS Initialization Overview
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RAS
PSS
1) DL Sync2) UL BurstInformation acquisition
PSS
RAS RAS
PSS
RAS
PSS
6) Backoff7) Ranging Code TX
RAS
PSS
UL-MAP
RAS
PSS
UL-MAP
RNG-REQ(MAC_Address)
8) Timing,Power, &FrequencyAdjustment9) RandomSubch, Symbol,Code selection10) RangingCode TX
SystemInfo CH/DL-MAP
3) UL-MAP Scan4) RandomSubch, Symbol,Code selection
5) Ranging CodeTX
RNG-REQ(Code)
RNG-RSP(Success)
PSS
RAS
PSS
RAS RAS
PSS
RNG-RSP(Management CIDs)
RNG-REQ(Code)
Binary-exponential
RandomBackoff
11) RNG-RSP(Success) RXmapped withtransmittedSubch,
Symbol, &Code
12) RNG-REQmessage TXwith MACAddress
13) RNG-RSP(ManagementCIDs) RX
Timer T3Expire
RNG-REQ(Code)
RNG-RSP(Continue)
XI. Introduction of MAC : Ranging Procedures
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Network Topology AcquisitionNetwork Topology Advertisement
Channel information for neighboring RAS normally provided by DCD/UCD messagePSS Scanning of neighbor RAS
RAS/PSS may allocate/request time intervals to PSS’s for the purpose of seeking and monitoring neighbor RAS suitability as targets for HO
Association ProcedurePre-Calibration of Ranging Parameter before actual Handover using Ranging
HO ProcessCell Selection
The process of PSS scanning and/or Ranging one or more RAS in order to determine suitabilityHO Decision and Initiation
RAS initiated Handover RequestMS initiated Handover Request
HO CancellationHandover Cancellation by PSS’s discretion before actual handover
Target RAS scanning and synchronizationTermination with the Serving RAS
Ping Pong during HOReport of Ping Pong effect by PSS to target RAS
Network entry/re-entry
XI. Introduction of MAC : Overall Handover Procedures
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Scanning ProcedureWhen neighbor RAS are identified during scanning, the PSS shall attempt to synchronize with their downlink transmissions, and estimate the quality of the PHY channel.During scanning interval, PSS may try association with scanned neighbor RAS.The RAS may buffer incoming data during the scanning period, and transmit that data after the scanning period. After scanning, the PSS shall report the scanning result periodically or based on event-triggered.
Association ProcedureTo indicate successful scanning and ranging attempts for the purpose of HO Upon completion of a successful PSS initial-ranging of a RAS
When Service Level Prediction parameter = 2 in RNG-RSPthe PSS may mark the RAS as Associatedrecording elements of the RNG-RSPsetting an appropriate aging timer
While Association is valid (aging timer has not expired), PSS may use recorded Associated Ranging values to set Initial Ranging values in a new initial Ranging event to the same Associated RAS.
XI. Introduction of MAC : Scanning Operation
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Fr#(n+6) Fr#(n+7) Fr#(n+8) Fr#(n+9) Fr#(n+10) Fr#(n+11)Fr#(n) Fr#(n+1) Fr#(n+2) Fr#(n+3) Fr#(n+4) Fr#(n+5)
NBR-ADV
RAS#1
PSS
SCN-REQScan Duration
PSS PSS PSS
RAS#1
RAS#1
RAS#1
RAS#1
PSS
SCN-RSP Scan Duration
RAS#1
PSS
RAS#1
PSS
RAS#3
PSS
DL-SynchDL sync. & DL I nfomation
RAS#3
PSS
RNG-REQ*
RAS#3
PSS
RAS#3
PSS
REG-REQSCN-RSP
RAS#3
PSS
SCN-REQ REG-RSP REG-RSP
RNG-REQ/ RSPAssociation-initial-rangingDuring Scanning I nterval
Scanning I nterval
XI. Introduction of MAC : example of Scanning Procedure
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Fr#(n+6) Fr#(n+7) Fr#(n+8) Fr#(n+9) Fr#(n+10) Fr#(n+11)Fr#(n) Fr#(n+1) Fr#(n+2) Fr#(n+3) Fr#(n+4) Fr#(n+5)
RNG-RSP
HO-I NDRAS#1 communicates
through the backbone with RAS#2 and RAS#3
and decides which one to recommend the PSS to
transition to
RAS#1
PSS
HO-REQPossible target RAS: RAS#2: S/ N=15dB RAS#3: S/ N=17dBTime to HO: 7 Frames
PSS PSS PSS
RAS#1
RAS#1
RAS#1
RAS#1
PSS
HO-RSPRecommended target RAS: RAS#3: S/ N=17dBTime to HO: 3 Frames
RAS#1
PSS
RAS#1
PSS
RAS#3
PSS
DL-MAPFast UL Ranging I E = Assign Contentionless ranging opportunity
RAS#3
PSS
RNG-REQ
RAS#3
PSS
RAS#3
PSS
REG-REQ
REG-RSP
RAS#3
PSS
HO-RSP DL-MAP
XI. Introduction of MAC : example of Handover Procedure
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Sleeping mode is to minimize PSS’s energy usage as one of mobility supporting while staying connected to the network
Implementation of power-save mode is optional feature
Based on 4IPP Traffic modelAwake mode : exchanging PDUs in a normal fashion
Sleep mode : no exchanging PDUs and the PSS may power down
XI. Introduction of MAC : Sleep mode(1/2)
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Sleep window = Sleep-interval + Listening-intervalIncreasing Binary Exponentially until Maximum Sleep window
Sleep-interval A time duration, measured in whole frames where the PSS is in sleep-modePSS does not send or receive PDUs, and may power down one or more physical operation componentsPSS may awaken for periodic ranging
Listening-interval A time duration, measured in whole frames where the PSS is in Awake-modePSS shall synchronize with the Serving RAS downlink PSS shall listen for an appropriate MOB-TRF-IND message. The PSS shall decide whether to stay awake or go back to sleep based on the either value of its own 2-bit indicator in the SLPID bitmap orThe basic CID of the PSS in a MOB-TRF-IND from the Serving RAS.
XI. Introduction of MAC : Sleep mode(2/2)