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IEEE C802.20-03/109. System Requirements update. Objectives of 802.20 Requirements SRD Status Significant Changes made since the last Plenary Open sections Concerns Next Steps. Review of Objectives. Create consensus Requirements document for 802.20 MBWA standard Service Vision

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System requirements update
System Requirements update

  • Objectives of 802.20 Requirements

  • SRD Status

  • Significant Changes made since the last Plenary

  • Open sections

  • Concerns

  • Next Steps

Review of objectives
Review of Objectives

  • 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

802.20 Requirements Vision



High BW Connectivity

Video Streaming - Conferencing Apps

Field Service Apps

Portable Remote Access Services



Broadband Wireless




High BW Connectivity



Campus W- PBX Services

Mobile Office (Voice and Data Apps)

Mobile B-to-C

M-Commerce Services



Portable Services in

Public Hot-Spots

F - 7

802.20 Service Vision

  • 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

Srd status
SRD Status

  • 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

Update on closed sections
Update on Closed Sections

See Appendix for more detailed explanation

Srd status update
SRD Status update

  • 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).


  • 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

Next steps
Next Steps

  • 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

Broadcast multicast 2 2

  • The AI shall support broadcast and multicast services.

    • Contribution made in Singapore

System gain 4 1 1
System Gain (4.1.1)

  • 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.

Coverage enhancing technologies 4 1 12
Coverage Enhancing Technologies (4.1.12)

  • 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 transmit-signal 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.  

Link adaptation and power control 4 2 2
Link adaptation and power control (4.2.2)

  • 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 adaptivebandwidth allocation, and adaptive power allocation. The system will have adaptive modulation and coding in both the uplink and the downlink

Synchronization 4 2 5
Synchronization (4.2.5)

  • 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.

Frequency reuse
Frequency Reuse

  • 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.