1. WiBro Service and Standardization Status (Based on IEEE 802
WiBro Service and Standardization Status (Based on IEEE e Specification)
May 10, 2005
Chulsik Yoon
Portable Internet Standardization Research Team,
ETRI (Electronics & Telecommunications Research Institute)

2. 1. WiBro Service Positioning, Design Concept and Service/System Requirements

3. What is “WiBro”? WiBro Definition Reference High Mobility Data Rate
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.
Definition
“Portable Internet” was named as 『WiBro』. (End of April, 2004)
WiBro : Wireless Broadband
Reference
WiBro
Low Cost
Anytime,
Anywhere
Mobility
High
Data Rate

4. WiBro Service Positioning
Strong needs to High Speed Portable Internet:
Easy connectivity: anywhere and anytime internet access
High-speed Data: about high-speed wireline internet
Low mobility : nomadic ~ medium-speed mobile user
Terminal : notebook, handheld PC, PDA, smart phone, etc.
WiBro Service Positioning Tx
Rate
High-Speed Internet
4G Mobile Communication
Wirelss
LAN
HPi Internet
3G Mobile Communication
Fixed
Low Mobility
Mobile
Mobility
Mobility
(Nomadic User)
Low Cost
High Tx Capacity
HPi Service

5. WiBro and IEEE
Fixed Wireless (TGd; IEEE Std ): IEEE Standard published on 1 Oct
“IEEE Standard for Local and metropolitan area networks Part 16: Air Interface for Fixed Broadband Wireless Access System”
As a revision of IEEE Standard (as amended by IEEE Standard c-2002, and IEEE Standard a-2003).
Mobility Support Enhancement (TGe; P802.16e/D7): - During the Process of Sponsor Ballot Resolution
IEEE-SA Standard Board approved a modified project authorization (PAR) for P802.16e project on 23 Sept Amendment for Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands below 6 GHz
Plan to complete in Sept
WiBro Specification = Subset of Consolidated version of “IEEE Std P802.16e/D7 +P /Cor/D2.”

6. Relationship between WiBro and IEEE 802.16.
IEEE P802.16e/D7
(Combined Fixed and Mobile Operation in Licensed Bands below 6 GHz)
WiBro (Complete Subset of IEEE )
Should support the IEEE Standard and IEEE P802.16e/D3 or later version 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
WiBro Profile = the set of functionalities configuring every mandatory features and many optional features of e.
WiBro Air Interface Specification is fully compatible with IEEE P802.16e/D7 based on IEEE Std , and P /Cor/D2
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.)
IEEE P /Cor/D2
(To correct errors, inconsistencies, and ambiguities in IEEE Standard )
IEEE Standard
(SC, SCa, OFDM, OFDMA PHY mode
with Single IEEE MAC)

7. IEEE Specifications

8. MAC Common Part Sublayer
IEEE Reference Model
Convergence sublayer (CS)
DL(BS), UL(SS): Classifying SDUs to CID.
Payload header suppression.
MAC CPS
Bandwidth allocation
Connection establishment
Connection maintenance
Quality of Service (QoS)
Scheduling of data over the PHY.
Privacy sublayer
Providing authentication
Secure key exchange
Encryption
Physical layer
Service Specific
Convergence Sublayer
(CS)
MAC Common Part Sublayer
(MAC CPS)
Privacy Sublayer
Physical Layer
(PHY)
PHY SAP
MAC SAP
CS SAP
MAC
PHY

9. WiBro Design Concept – ETRI’s view
OFDM/OFDMA/TDD
OFDM & OFDMA advantages
Robust against multipath delay spread
No intra-cell interference (orthogonal multiple access)
High degree of freedom in resource allocation
TDD
No need for pair bands
Flexible DL and UL resource allocation (time zone) according to traffic request
BS 1
Cell 1

10. FRF-1 deployment Diversity subchannelization
Guarantees that the number of hits between subchannels of different cells is even and small  Inter-cell interference is averaged out.
Low coding rate (repetition)
Provides robustness against inter-cell interference under full loading
BS 1
BS 2
Repetition
Cell 1
Cell 2

11. Flexible band selection and diversity modes
Selection based on user channel characteristics
Low mobility and high SNR  Band selection mode
High mobility and low SNR  Diversity mode
For diversity users
Utilizes multiple dimensions of diversity to enhance statistical reliability
Wideband frequency diversity
For band selection users
Maximizes multi-user scheduling gain by utilizing channel selectivity of each user
BS 1
BS 2
Diversity
Band AMC
Cell 2

12. Adaptive Modulation and Coding (AMC)
For high spectral efficiency (high data rate)
High SNR
 High order modulation and high rate coding
 High spectral efficiency
Based on user channel measurement feedback
Fast feedback in dedicated physical channel
CQI (Channel Quality Indication)
RSSI (Received Signal Strength Indication)
BS 1
BS 2
QPSK
1/12 rate
64QAM
4/5 rate
Cell 2

13. Hybrid ARQ Fast physical layer retransmission
Soft combining and Incremental redundancy
Overcome link adaptation error (AMC)
Robust to channel and interference fluctuation
Higher target FER at PHY (ex. FER 1% 10%)  Lower operating SINR (ex. SINR 6 dB  4 dB)  Capacity gain MS BS
Packets
Typical ARQ at Layer 2
ACK/NAK
MAC PDU #1
MAC PDU #2
MAC PDU #2
MAC PDU #1
MAC PDU #2
MAC PDU #2
PHY
MAC
PHY
MAC
Hybrid ARQ at Layer 1
PHY #1
PHY #2
PHY #3
PHY #4
PHY #3
PHY #5
PHY #1
PHY #2
PHY #3
PHY #4
PHY #3
PHY #5
PHY
PHY
Fast retx
Soft bit combing and IR decoding

14. Short TTI (Transmission Time Interval)
WiBro 5 ms (c.f., WCDMA 10 ms)
Fast AMC
Fast access and handoff
Support of 60 km/h mobility
Maximum Doppler spread
2.35 GHz, 60 km/h  fd = Hz  Fading coherent time (1/fd) = 7.66 ms
Maximum DL pilot subcarrier rotation period
3 symbol spacing: us < (Coherent time)/10
Maximum UL pilot subcarrier insertion period
4 symbol spacing: us < (Coherent time)/10

15. Internet packet traffic
Highly bursty
Packet-switch mode  Statistical multiplexing gain
Centrally controlled Resource Allocation by Base Station: MAP-based dynamic BW allocation  Dynamic burst allocation
DL WWW traffic
30Mbps/10MHz
UL traffic

16. WiBro Service/System Requirements – Industry Association’s view
Service Definition
Portable Internet Service is to provide a high data rate wireless internet access with PSS under the stationary or mobile environment, anytime and anywhere.
Service Concept
Under the stationary or mobile environment: service shall support stationary, nomadic, and medium-speed mobile users.
Anytime and anywhere: service shall provide seamless connectivity regardless of the place and time.
High data rate: service shall support the various types of wireless multimedia applications with a data rate of at least 1 Mbps.
PSS (Portable Subscriber Station): service shall support the various types of multimedia-enabled terminals such as handset, notebook, PDA, or smart phone.

17. Service Classes Unsolicited Grant Service Real-time service
Definition: Real time service offering fixed-size data packets on a periodic basis.
Examples: T1/E1, VoIP without silence suppression
Real-time service
Definition: Service which imposes delay constraints while requiring the guaranteed resource allocation during the session.
Examples: audio/video streaming, interactive game
Non-real-time service
Definition: Service which does not impose any delay constraints while requiring the guaranteed resource allocation during the session.
Examples: FTP, Multimedia mail, chatting, e-commerce
Best-effort Service
Definition: Service which does not impose any delay constraints while requiring no guaranteed resource allocation during the given service.
Examples: Web browsing,

18. Service Requirements
Cell types: Pico, Micro, Macro (for Urban environment)
Service coverage: the following cell radius must be supported for the different cell types in the urban environment.
Pico-cell: 100 m
Micro-cell: 400 m
Macro-cell: 1km
Mobility:
System shall support mobile users at a velocity of up to 60 km/hr.
Handoff:
System shall support seamless IP-based service while users move from one cell to the other.
Authentication and Security
System shall prohibit unlawful usage and unlawful access network service except lawful user and terminal.

19. Service Requirements (cont.)
QoS (Quality of Service):
System shall provide different types of QoS, depending on subscriber’s service classes.
Charging:
System shall provide various basic data to support various charging rate, depending on subscriber’s needs.
Interworking with other network systems
System shall support interworking with other network systems such as wireless LAN and other mobile communication networks, etc.

20. Access Network Requirements & Parameters
Frequency reuse factor: FRF = 1
Spectral efficiency (bps/Hz/cell):
Maximum spectral efficiency: Downlink = 6, Uplink = 2
Average spectral efficiency: Downlink = 2, Uplink = 1
Transmission data rate
Minimum transmission data rate per user: Downlink = 512 kbps, Uplink = 128 kbps
Maximum transmission data rate per user: Downlink = 3 Mbps, Uplink = 1 Mbps
Handoff requirements
Inter-sector handoff: < 150 msec
Inter-cell handoff: < 150 msec

21. PSS Requirements & Parameters
Power saving function
PSS shall support a power saving function to minimize the power consumption.
Mobility support
PSS shall support IP-based seamless service when it moves to another cell.
Multicast/Broadcast
PSS shall be able to receive multicast/broadcast data transmitted from the network.
Interworking with other networks
PSS shall be able to provide an appropriate method to control the connection when interworking with other networks.
Authentication and Security
MSS shall support the authentication /security protocol based on EAP. If necessary, the PKI-based protocol shall be supported.
Various cryptographic functions shall be provided.

22. System Comparison Item W-LAN WiBro IMT-2000 Service type
- Packet based
- High-speed data
- IP originating call
- IP based call
- Circuit/Packet based
- Medium/Low-speed data
- Originating/Terminating call
Service characteristics
- Private
- No QoS guarantee
( BW contention )
- Public
- QoS guarantee
( BW allocation )
Tx. rate
- Maximum 54Mbps
- Maximum 50Mbps
- Maximum 2 ,or 10Mbps
Cell
coverage
- Coverage : 100m
- pico(hot spot area)
- Coverage : 1Km
- micro/pico(full coverage)
- Coverage : 10Km
- macro/micro(full coverage)
Mobility
- Fixed (Coverage)
- Low mobility(60Km)
- High mobility (250Km)
Cell planning
- no
- Frequency reuse (~1)
Cell capacity
- 54Mbps
- 50Mbps
- 2Mbps(Ev-DO)
- 10Mbps(HSDPA)
Cell structure
- omni
- 1 to 3 sector
Terminal
- PC, Note-book, PDA
- Note-book, PDA
- Cellular phone, PDA

23. 2. WiBro Standardization Status and Commercialization Plan

24. WiBro Standardization Status (IEEE 802.16)
IEEE Standardization Status (cont.)
IEEE P802.16e Draft Development Schedule (Expected Plan for Sept Approval)
2005/02/11: Issue P802.16e/D6
2005/02/14-03/01: P802.16e/D6 Sponsor Ballot Recirculation
2005/03/14-17: Comment Resolution at IEEE Session #36
2005/04/11: Issue P802.16e/D7
2005/04/12-04/27: P802.16e/D7 Sponsor Ballot Recirculation
2005/05/02-05/05: Comment Resolution at IEEE Session #37
2005/05/25: Issue P802.16e/D8
2005/07/22: 802 EC Approval to forward to RevCom
2005/08/13: RevCom Submittal
2005/09/21: RevCom recommends approval of P802.16e/D8
2005/09/22: IEEE SA Standard Board approves IEEE Std e
2005/10: IEEE Std e Publish

25. IEEE 802.16 Standardization Status (cont.)
Network Management (TGf - MIB):
Third draft of Management Information Base (MIB) was made. The Working Group agreed to seek approval to forward Draft 3 for Sponsor Ballot.
Network Management (TGg - Management Plane Procedures and Services):
Approved the Baseline document and resolve the comments raised.
Maintenance for IEEE Std (Corrigendum):
The IEEE-SA Standard Board approved a PAR creating a corrigendum project “P /Cor/D2” for maintenance of IEEE Standard
Plan to complete in Oct

26. Frequency Allocation for WiBro

27. Expected WiBro Commercialization Plan
WiBro Policy Making and Expected Commercialization Plan
Oct. 2002: Re-allocation of WLL frequency bands to WiBro Service (To get more efficient spectrum usage)
July, 2003: Organize the WiBro Service Task Force (To foster the high speed portable internet service)
July, 2004 : MIC announce the WiBro Licensing Policy and Baseline Technology .
Should support the IEEE Standard and IEEE P802.16e/D3 or later version and provide the following 5 criteria:
Duplexing: TDD
Frequency Reuse Factor: 1
Channel Spacing: More than 9 MHz
Minimum throughput per user at the cell providing mobility of 60 km/hr : UL 128 kbps, DL 512 kbps
Roaming between WiBro Operators
Some coordination issues between WiBro operators such as each operator’s Tx/Rx Time Slot timing alignment should be followed by the agreement between them.

28. WiBro Policy Making and Expected Commercialization Plan:
Jan. 2005: Selection of WiBro Operators (Decision by assessment of Business Plan proposed by candidate operators)
Three operators (KT, SK Telecom, Hanaro-telecom*) are selected in advance for the schedule.
: Development of Commercial Equipments by major manufacturers.
Major manufacturers (Infrastructure Systems, Radio Relays, Mobile Terminals) state that they have plans to develop commercial systems in 4Q-2005, and will start the conformance test in 1Q-2006.
1Q. 2006: Commencement of pre-commercialization Service
2Q. 2006: Commencement of Commercialization Service in Seoul.
* Hanarotelecom has recently withdrawn the WiBro operator license.

29. “Thank you for your kind attention!”
Q & A
“Thank you for your kind attention!”