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Below 6GHz 11vht PAR&5C's proposal

Below 6GHz 11vht PAR&5C's proposal. Date: 2008-03-17. Legend for edits: Red: delete text Blue: insert text Pink: discussion topic. Authors:. Purpose of this document.

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Below 6GHz 11vht PAR&5C's proposal

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  1. Below 6GHz 11vht PAR&5C's proposal Date: 2008-03-17 Legend for edits: • Red: delete text • Blue: insert text • Pink: discussion topic Authors: Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  2. Purpose of this document • This proposal is there to stimulate discussions and highlights a possible focus for below 6GHz 11VHT PAR and 5C’s: please submit any constructive modifications. It exists in an open framework. • Recommendation: collectively we need to come up with • Refined analytical framework: metrics • Agreed upon terminology Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  3. Key elements emphasized in redaction • Concepts highlighted • Below 6GHz unlicensed spectrum and consider possibility for licensed IMT.Adv operation, exclude 2.4GHz operation • Adopt aggregated BSS throughput instead of focusing uniquely on a single link throughput metric • WLAN Use Case Focused • Documents that served as a foundation for this proposal • 02/798r7: HT SG draft PAR • 02/799r6: HT draft 5 criteria • 07/574r1: Draft PAR and 5 Criteria for the Gigabit Wireless Task Group • 08/0081r2: Mobile cooperation usage models Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  4. PAR Scope Purpose Need for the project 5C’s Broad Market Potential a) Broad sets of applicability b) Multiple vendors and numerous users c) Balanced costs (LAN versus attached stations) Compatibility Distinct Identity a) Substantially different from other IEEE 802 standards b) One unique solution per problem (not two solutions to a problem) c) Easy for the document reader to select the relevant specification Technical Feasibility a) Demonstrated system feasibility. b) Proven technology, reasonable testing. c) Confidence in reliability Economic Feasibility a) Known cost factors, reliable data b) Reasonable cost for performance c) Consideration of installation costs Highlighted sections deserving specific attention Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  5. PAR: scope (evolution of 08/121r0) • The scope of this project is to define an amendment that shall define standardized modifications to both the 802.11 physical layers (PHY) and the 802.11 Medium Access Control Layer (MAC) so that modes of operation can be enabled that are capable of supporting: • A multi-user BSS peak aggregated throughput of at least xGbps as measured at the MAC data service access point (SAP) • Strawpoll proposal on x value: shall initial 1Gpbs be reduced to <800Mbps • Shall multiple SAP be captured? • Remark: one single STA might not fulfil the PAR since it is about aggregated throughput. Potential impact on certification process. • Capability of handling multiple communications at the same time • Below 6GHz carrier frequency operation excluding 2.4GHz operation and ensuring backward compatibility and coexistence with legacy IEEE802.11a/n devices in the 5GHz unlicensed band. • We could include in 2.4GHz frequency band up to 40MHz operation for VHT. Might result in a very difficult framework for coex/backward compatibility. Proposal for a strawpoll. Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  6. Rate expectation discussion • Preliminary remarks/questions: • One could think that we must go far beyond 11n max PHY rate but is this realistic for a reasonable client configuration/cost? • 11a max PHY rate is achievable at (54Mbps) whereas 11n max PHY rate (600Mbps) has not been demonstrated yet: this need to be considered as a specification number. • Initially MAC SAP throughput was introduced for providing a better metric for setting users expectations but currently peak PHY throughput is still used as the marketing number on the product boxes: shall we revert the policy and come back to PHY throughput metric to define the PAR? • Some baseline reference numbers: • 11a max PHY rate: 54Mbps, estimated MAC SAP rate (without aggregation, 5 users): 27Mbps (2x) • 11n: max PHY rate (40MHz 4STS Short GI): 600Mbps, PAR MAC SAP target rate: min max of 100Mbps • Need to anticipate that this method could be used for PAR MAC SAP throughput expectation derivation • 11a->11n PAR gap: 100/54=1.85 • 11n->11vht gap should thus be to match evolution rate: PAR(11vht)=PAR(11n)/max(11a)*max(11n)=1.85*600=1.11Gbps! • Reality sanity check: some rough initial MAC SAP throughput numbers extrapolated from 11n (5 users contending, 2ms TxOP AMSDU aggregation) • 3ss 4x20MHz: 680Mbps, 3ss 5x20MHz: 850Mbps • 2ss 4x20MHz: 450Mbps, 2ss 5x20MHz: 560Mbps • Question: limit cost of client to 2ss? • Reference 11n PHY max rate: 2ss: 130/270Mbps, 3ss 195/405Mbps for 20/40MHz • Proposed methodology for the peak aggregated BSS throughput derivation • Increase moderately PAR MAC SAP target increase evolution of 3.7x from 11a->11n to 5x for 11n->11vht: i.e. 500Mbps • Before strawpoll concluding remark: a reasonable PAR target will allow not to put too much constraints on entry point products and does not preclude defining multiple Gbps modes following the model introduced in 11n. The gap that is recommended to consider is on the MAC SAP rates evolution Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  7. Scope strawpolls • Strawpoll 1: • What is the preferred metric to adopt as aggregated BSS throughput: • Peak PHY rate • MAC SAP rate • Strawpoll 2: • What should be the target MAC SAP aggregated BSS throughput: • 500Mbps • 750Mbps • 1Gbps • Strawpoll 3: • Should we provision in the PAR scope 2.4GHz operation for channelization smaller that 40MHz? • Yes • No • Abstain Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  8. PAR: purpose (evolution TGn) • The purpose of the project is to improve the 802.11 wireless local area network (LAN) user experience by providing significantly higher aggregated throughput for existing WLAN application areas and to enable new market segments for operation below 6 GHz including distribution of multiple multimedia/data streams. Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  9. PAR: need for the project (07/574r1) • As wireless networks are deployed, users are able to transition applications from fixed, non-wireless links to the convenience, freedom and versatility of wireless links. These transitions create an evolutionary demand to enhance the wireless network to support new classes of applications with higher bandwidth requirements. Wireless networks are particularly in need of continual enhancements since the link is by definition shared. • This project will meet that evolving need for higher bandwidth in the projected completion timeframe and enable the transition of the next class of applications. Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  10. Broad Market Potential (evolution of 07/574r1) • Broad sets of applicability • According to InStat and ABI Research, demand for WLAN is expected to grow at a 34% Compound Annual Growth Rate (CAGR) over the next five years. Over 75% of all home-networking connections and over 95% of all mobile PC network connections will be via WLAN links by 2011. More than 12% of mobile phones are expected to include Wi-Fi connectivity by 2011. • New uses such as multimedia, simultaneous transmission of multiple high rate video streams, audio, and on-line gaming, immersive environments and collaborative communications, will drive the need for higher throughput in the home, enterprise and outdoor environments. • As usage increases in the outdoor, corporate and other high-density environments (e.g. a 20% increase in number of hotspots is expected between 2008 and 2011), bandwidth restrictions of a shared media will start to occur. • This is very similar to what happened in the wired Ethernet market where the need for higher throughput drove the development and adoption of Fast Ethernet (100 Mbps). The need for higher throughput drove switching and 100Base-TX adoption, then Gigabit Ethernet (GbE), then 10GbE. While a switching technology would be desirable for WLAN, this is not technically feasible. 802.11 developments have followed a similar progression from 1 & 2 Mbps, to 11 Mbps, to 54 Mbps, to 300 and 600 Mbps. The next logical step in wireless LAN technology is to further increase the BSS aggregated data throughput. • In parallel to the traditional legacy usage for WLAN, the ITU has opened up the possibility for nomadic 1Gbps IMT-Advanced WLAN technology, providing a means for broadening even further the applicability of WLAN technologies. Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  11. Broad Market Potential (evolution of 07/574r1) • Multiple vendors and numerous users. • A wide variety of vendors currently build numerous products for the WLAN marketplace. According to ABI Research Wireless LAN revenues is expected to surpass $6B by 2011 and it is anticipated that the majority of those vendors, and others, will participate in the standards development process and subsequent commercialization activities. • According Wi-Fi Alliance the community of Wi-Fi users in 2008 is estimated to count more than 250M members. • Balanced costs (LAN versus attached stations). • WLAN equipment is accepted as having balanced costs. The development of Gigabit Wireless capabilities will not disrupt the established balance Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  12. Compatibility (evolution 07/574r1) • Compatibility with IEEE 802 requirements will be accomplished by keeping the MAC SAP interface the same as the existing 802.11 standard. • The proposed amendment shall introduce no 802.1 architectural changes. • The MAC SAP definition shall not be altered, ensuring that all LLC and MAC interfaces are compatible to and in conformance with the IEEE 802.1 Architecture, Management and Internetworking standards. • New managed objects shall be defined as necessary in a format and structure consistent with existing 802.11 managed objects. • Backward compatibility and coexistence with legacy devices will be granted for the 5GHz bands. Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  13. Distinct Identity (07/574r1) • Substantially different from other IEEE 802 standards. • This project will result in a wireless LAN with higher aggregated throughput than that provided by 802.11a, 802.11b, 802.11g and 802.11n. • The goal is to increase the overall system throughput by considering new technologies, for the both PHY and MAC layers, operating below the 6GHz band. • VHT will allow a corporate or home user to roam from high-throughput, dense cells to wider area networks in a seamless manner while maintaining full support for the installed base security, management, diagnostics and backbone infrastructure. This will be supported by maintaining backwards compatibility to 802.11 standards like for instance 802.11 i/w for security, 802.11s for mesh networking, 802.11 k/v for network management. • The VHT amendment may consider applications described by IMT-Advanced for nomadic WLAN systems. • IEEE P802.15 TG3c intends to support higher physical data rates than those currently defined by P802.15 task group 3, and similar to those targeted by this proposal. However, the applications of 802.11 and 802.15 are different. 802.15 defines standards for short-range wireless personal area networks, 802.11 defines standards for relatively longer-range wireless local area networks. The different requirements of each group will result in different standards that satisfy the purpose and scope defined in each project’s PAR. • One unique solution per problem (not two solutions to a problem). • There is no other wireless LAN standard providing significantly higher aggregated throughput than 802.11vht. • Easy for the document reader to select the relevant specification. • The 802.11vht amendment will differentiate itself from other IEEE 802 wireless standards via the title which stresses the specification of gigabit speed WLAN technology. Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  14. Technical Feasibility (07/574r1) • Demonstrated system feasibility. • The following documents are examples that support the feasibility of elements of gigabit wireless technology:[GbTestbed]: Gigabit MIMO OFDM Testbed (Siemens)[PIMRC’06]: 8x8 MU-MIMO Testbed (NTT) • As a further illustration of feasibility, Draft 802.11n equipment is already in use, which demonstrates the ability of current devices to deliver link-rates of 300 Mbps. The 802.11n specification includes optional features that allow the support of link rates up to 600 Mbps. A simple example to demonstrate the feasibility of achieving link ratesin excess of 1Gbps would be to double the channel width, which would yield a peak linkrate specified of 1.2 Gbps. • Proven technology, reasonable testing. • Until the full extent of the user models referenced in the IEE802.11vht PAR is understood, the study group cannot completely assess the extent of reasonable testing for those technologies. However, 802.11 is a mature technology which has a wide variety of legacy devices and a proven track record, with hundreds of millions of devices shipping each year andthe increased capabilities envisioned for the baseband and RF parts necessary to implement the proposed amendment are in line with the current progress in semiconductor technology. • Confidence in reliability • Analysis of current WLAN products and new academic research provides confidence in the reliability of the technology that will be developed by the project. There are currently reliable WLAN solutions. The study group envisions that the project will result in similar or improved reliability over current levels. Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  15. Economic Feasibility (07/574r1) • Known cost factors, reliable data. • Support of the proposed standard will likely require a manufacturer to develop a modified radio, modem and firmware. This is similar in principle to the transition between 802.11b or 802.11g and 802.11n, or between 802.11a and 802.11n. The cost factors for these transitions are well known and the data for this is well understood. • Reasonable cost for performance. • The new standard will provide manufacturers the ability to support aggregated gigabit per second wireless throughput speeds. In general, the cost factor changes needed to implement the technology envisioned by the study group are well within the capabilities of existing technology. Competition between manufacturers will ensure that costs remain reasonable. • Consideration of installation costs. • The proposed amendment has no known impact on installation costs. Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

  16. References • [1] Report ITU-R M.1645 “Framework and overall objectives of the future development of IMT‑2000 and systems beyond IMT‑2000” http://www.ieee802.org/18/Meeting_documents/2007_Jan/R-REC-M.1645-0-200306-I!!MSW-E.doc • 08/0172r0: IMT-Advanced Opening Report • 02/798r7: HT SG draft PAR • 02/799r6: HT draft 5 criteria • 07/574r1: Draft PAR and 5 Criteria for the Gigabit Wireless Task Group • 08/121r0: Mobile cooperation usage models • 07/2988r0: Liaison from Wi-Fi Alliance to 802.11 regarding WFA VHT Study Group Consolidation of Usage Models • 08/0081r2: Mobile cooperation usage models • 11-07-2187-00-0vht-another-resource-to-exploit-multi-user-diversity.ppt • [GbTestbed]: http://iaf-bs.de/projects/gigabit-mimo-ofdm-testbed.en.html • [PIMRC’06]: Performance Evaluation of 8x8 Multi-User MIMO-OFDM Testbed in an Actual Indoor Environment, IEEE PIMRC’06 Courville (Motorola), Kraemer (Marvell), Engwer (Nortel), De Vegt (Qualcomm), Erceg (Broadcom)

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