IEEE C802.20-03/109
Project
IEEE 802.20 Working Group on Mobile Broadband Wireless Access
<http://grouper.ieee.org/groups/802/20/>
Title
Requirements Group Update
Date
Submitted
2003-11-10
Source(s)
Khurram Sheikh,
John Humbert
6220 Sprint Parkway,
MS KSOPHD0504 - 5D276
Overland Park, KS 66251
Re:
System Requirements Update
Abstract
This contribution provides an update on the status of the System Requirements document.
Purpose
Status Update
Notice
This document has been prepared to assist the IEEE 802.20 Working Group. It is offered as a basis for discussion and is not binding on the
contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The
contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
Release
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications
thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it
may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting
IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.20.
Patent Policy
The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE-SA Standards Board Operations Manual
<http://standards.ieee.org/guides/opman/sect6.html#6.3> and in Understanding Patent Issues During IEEE Standards Development
<http://standards.ieee.org/board/pat/guide.html>.
Voice: (816) 210-9611
Fax: (913) 794-0420
Email: khurram.p.sheikh@mail.sprint.com
jhumbe01@sprintspectrum.com
System Requirements update
C802.20-03/109
• Objectives of 802.20 Requirements
• SRD Status
• Significant Changes made since the last
Plenary
• Open sections
• Concerns
• Next Steps
-2-
Review of Objectives
C802.20-03/109
• Create consensus Requirements
document for 802.20 MBWA standard
– Service Vision
– Define key technical parameters and
performance targets/ metrics
– PHY & MAC Layer Technical Requirements
– Layer 2+ support requirements
– Co-ordinate with other CG groups to
develop standard
-3-
802.20 Requirements Vision
C802.20-03/109
Home
Domain
High BW Connectivity
Video Streaming Conferencing Apps
Field Service Apps
Portable Remote
Access Services
Work
Domain
Seamless,
Ubiquitous
Broadband Wireless
Portable
Office
Experience
Campus W- PBX
Services
High BW Connectivity
Mobile Office (Voice
and Data Apps)
Portable Services
in
Public Hot-Spots
Mobile B-to-C
M-Commerce
Services
Elsewhere
Domain
-4-
802.20 Service Vision
C802.20-03/109
• DSL/ Cable equivalent data
performance
• Full Mobility
• Ubiquitous service model
• All IP architecture support
• IP QoS support
• ?x+ performance/ cost advantage
to 3G wireless systems
-5-
SRD Status
C802.20-03/109
• 5 conference calls since the September
meeting in Singapore
• 31 out of 57 (54%) sections have reached
consensus in the correspondence group.
• Version 9 of the System Requirements posted
on the IEEE web site.
• Singapore discussions
– Reference Architecture, Channel Bandwidth, FER,
Sustained Spectral Efficiency, QoS, Multicast,
Repeater Delay, Synchronization, OAM
-6-
Update on Closed Sections
C802.20-03/109
Section Section Name
Status
2.2
Broadcast/Multicast
Added in Singapore
4.1.1
System Gain
Removed
4.1.12
Coverage Enhancing
Technologies
Formally repeaters
scope expanded
4.2.2
Link adaptation and power
control
Consensus version
4.2.5
Synchronization
Contribution from
Singapore
Frequency Reuse
Removed
See Appendix for more detailed explanation
-7-
SRD Status update
C802.20-03/109
• Open issues:
– System Architecture, Spectral Efficiency, Block
Assignments (formally Channel Bandwidth),
Duplexing, Aggregate Data Rates, Number
Simultaneous Active users, Latency, FER, Antenna
Diversity, Best Server Selection, QoS, Performance
under mobility & Delay Spread, MAC/PHY
Measurements, IP Level HO. 802.1Q Tagging, OA&M
support, MAC Complexity, Call Blocking, Priority
Access (new section), Multicarrier Support (new).
-8-
Concerns
C802.20-03/109
• Key Issues Unresolved
– Key system technical parameters still undecided e.g.
Channel BW & Duplexing
• Polarized Group
– Trivial issues take on “larger than life” status e.g. AI
– Conservative targets gain consensus
• Lack of specificity
– To gain consensus the language in the SRD tends to
be vague
– The quality of any subsequent work is highly
dependant on the level of detail in the SRD
-9-
Next Steps
C802.20-03/109
• Need to make decisions on key
technical parameters this plenary to
close out Phase 1 requirements
• Need to focus on Beyond 3G
• Need to hold regular coordination
meetings between the various CG’s
• Need to get schedule published for
overall 802.20 project
-10-
C802.20-03/109
Appendix
-11-
Broadcast/Multicast(2.2)
C802.20-03/109
• The AI shall support broadcast and
multicast services.
– Contribution made in Singapore
-12-
System Gain (4.1.1)
C802.20-03/109
• This section was removed form the SRD
– It was difficult to come up with a target number
given that there were several different types of BTS’s
that are supported.
– The required system gain for a mesh network is
completely different that what is required for a point
to multipoint network.
– Total system gain is dependant on factors outside of
scope of the 802.20 PAR.
– Definition of System gain placed in Appendix A.
• System gain - is defined as the difference, in dB,
between transmitter power output at the base station
and the receiver threshold (sensitivity) at the mobile
terminal.
-13-
Coverage Enhancing
Technologies (4.1.12)
C802.20-03/109
• This started out as a contribution on repeaters in Singapore.
Subsequent discussions within the CG resulted in the following
language and definition.
– The system shall support the use of coverage enhancing
technologies
– Coverage Enhancing Technologies: In the context of wireless
communications - technologies that augment the radio signal, in
areas within the boundary of a cell, where the BS/MS transmitsignal is obstructed and significantly attenuated by terrain or
man-made structures. Such technologies employ devices such as
repeaters, relays, leaky coax etc. that rely on the BS they extend
from for backhaul communications as well as Micro/Pico cells that
do provide their own backhaul connectivity. The term Repeater
typically refers to an analog device that amplifies and retransmits
the original transmission (without frequency translation). A
Relay (analog or digital) typically retransmits the received signal
in another frequency. A digital relay (or regenerator) decodes the
information from the received signal, regenerates and retransmits
it. In the case of packet communications, relays may also perform
Layer-3 functions as well as delayed transmission.
-14-
Link adaptation and power
control (4.2.2)
C802.20-03/109
• The AI shall support automatic selection of optimized
user data rates that are consistent with the RF
environment constraints and application requirements.
The AI shall provide for graceful reduction or increasing
user data rates, on the downlink and uplink, as a
mechanism to maintain an appropriate frame error rate
performance.
Link adaptation shall be used by the AI for increasing
spectral efficiency, data rate, and cell coverage
reliability. The AI shall support adaptive bandwidth
allocation, and adaptive power allocation. The system
will have adaptive modulation and coding in both the
uplink and the downlink
-15-
Synchronization (4.2.5)
C802.20-03/109
• The air interface shall support downlink
synchronization and uplink
synchronization. Synchronization
between Base Stations is optional.
• Contribution C802.20 -03/84 presented
at the Singapore WG session.
-16-
Frequency Reuse
C802.20-03/109
• This section was removed from the SRD
because:
– There are tradeoffs between spectral efficiency and
frequency reuse
– It was felt that this was not needed if section on
Spectral efficiency takes into account the reuse
factor
– The reuse factors vary depending on the level of
sectorization.
• The reuse factor in a 6 sector system is different that
in a 3 sector system.
-17-