ProjectIEEE Working Group on Mobile Broadband Wireless Access TitleRequirements Group Update Date Submitted Source(s)Khurram Sheikh, John Humbert 6220 Sprint Parkway, MS KSOPHD D276 Overland Park, KS Voice: (816) Fax: (913) Re:System Requirements Update AbstractThis contribution provides an update on the status of the System Requirements document. PurposeStatus Update Notice This document has been prepared to assist the IEEE 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 Patent Policy The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE-SA Standards Board Operations Manual and in Understanding Patent Issues During IEEE Standards Development.Section 6.3 of the IEEE-SA Standards Board Operations Manualhttp://standards.ieee.org/guides/opman/sect6.html#6.3http://standards.ieee.org/board/pat/guide.html IEEE C /109

-2- C /109 System Requirements update Objectives of Requirements SRD Status Significant Changes made since the last Plenary Open sections Concerns Next Steps

-3- C /109 Review of Objectives Create consensus Requirements document for 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

-4- C /109 Work Domain Home Domain Seamless,Ubiquitous Broadband Wireless Experience Elsewhere Domain Portable Remote Access Services Field Service Apps Campus W- PBX Services Portable Services in Public Hot-Spots Mobile B-to-C M-Commerce Services Mobile Office (Voice and Data Apps) High BW Connectivity Video Streaming - Conferencing Apps Portable Office High BW Connectivity F Requirements Vision

-5- C / 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

-6- C /109 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

-7- C /109 Update on Closed Sections SectionSection NameStatus 2.2Broadcast/MulticastAdded in Singapore 4.1.1System GainRemoved Coverage Enhancing Technologies Formally repeaters scope expanded 4.2.2Link adaptation and power control Consensus version 4.2.5SynchronizationContribution from Singapore Frequency ReuseRemoved See Appendix for more detailed explanation

-8- C /109 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 Q Tagging, OA&M support, MAC Complexity, Call Blocking, Priority Access (new section), Multicarrier Support (new).

-9- C /109 Concerns 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

-10- C /109 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 project

-11- C /109 Appendix

-12- C /109 Broadcast/Multicast(2.2) The AI shall support broadcast and multicast services. –Contribution made in Singapore

-13- C /109 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 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.

-14- C /109 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.

-15- C /109 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 adaptive bandwidth allocation, and adaptive power allocation. The system will have adaptive modulation and coding in both the uplink and the downlink

-16- C /109 Synchronization (4.2.5) The air interface shall support downlink synchronization and uplink synchronization. Synchronization between Base Stations is optional. Contribution C /84 presented at the Singapore WG session.

-17- C /109 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.