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Requirements Discussion

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1 Requirements Discussion
September 2014 doc.: IEEE /1234r0 September 2014 Requirements Discussion Date: Authors: Joseph Levy (InterDigital) Joseph Levy (InterDigital)

2 September 2014 doc.: IEEE /1234r0 September 2014 Abstract This contribution discusses the need for well defined requirements as part of the approved TGax Selection Procedure (11-14/0938r04). We contend that without meaningful and clearly defined requirements it is not possible to have an open and fair standards development process that adheres to the agreed Selection Procedure. Joseph Levy (InterDigital) Joseph Levy (InterDigital)

3 September 2014 doc.: IEEE /1234r0 September 2014 Summary of 11-14/0938r4 The Procedure begins with the Functional Requirements. Without agreed well defined requirements there is no criteria to judge the merit of the technical contributions. Building of the SFD based on technical criteria is critical to the selection procedure. Flow Chart from [1] Joseph Levy (InterDigital) Joseph Levy (InterDigital)

4 Our understanding of what a requirement is
September 2014 doc.: IEEE /1234r0 September 2014 Our understanding of what a requirement is Requirements should bound the goals of the task group By setting a minimum required performance By setting a allowed range of performance By setting an allowed degradation in performance Requirements should be clear to all task group participants Requirements should be measurable By simulation or calculation Requirements should expand and further define the goals/requirements stated in the PAR Joseph Levy (InterDigital) Joseph Levy (InterDigital)

5 Example of Functional Requirements from TGn [2]
September 2014 Example of Functional Requirements from TGn [2] Name Requirement Joseph Levy (InterDigital)

6 TGac Selection Procedure [3] States:
September 2014 TGac Selection Procedure [3] States: “TGac shall adopt, through a 75% approval in the Taskgroup, a Functional Requirements document that must be met by the proposed specification, including System Level Performance Targets and Simulation Scenarios for those Targets” [bold emphasis added] Joseph Levy (InterDigital)

7 Example of System Performance TGac [4]
September 2014 Example of System Performance TGac [4] 2.1 System Performance Multi-STA throughput measured at the MAC SAP to be at least 1 Gbps. TGac R1 – The TGac amendment shall provide at least a mode of operation capable of achieving a maximum Multi-Station aggregate throughput of more than 1 Gbps as measured at the MAC data service access point (SAP), utilizing no more than 80 MHz of channel bandwidth in 5 GHz band Single-STA throughput measured at the MAC SAP to be at least 500 Mbps. TGac R2 – The TGac amendment shall provide at least a mode of operation capable of achieving a maximum Single-Station throughput of more than 500 Mbps as measured at the MAC data service access point (SAP), utilizing no more than 80 MHz of channel bandwidth in 5GHz band. Note: document also defines the scenarios for which each of the requirements should be met. Joseph Levy (InterDigital)

8 Proposed Requirements
September 2014 Proposed Requirements Scope: set by the P802.11ax PAR [5] and CSD [6], as well as by the TGax usage models [7] Requirement areas referred to in the TGax PAR: System Performance Average Throughput 5th percentile Throughput Area Throughput System Efficiency Spectrum resources Spectral frequency reuse and interference management Robustness in outdoor propagation environments/uplink transmissions Other Requirements: Power Efficiency Backward compatibility Coexistence with legacy Multiple simultaneous communications in the spatial and frequency domains Joseph Levy (InterDigital)

9 Example Requirement R1 Average Throughput
September 2014 Example Requirement R1 Average Throughput The ax amendment shall provide at least one mode of operation capable of achieving at least four times improvement in the average throughput per station, compared to the existing IEEE standard and its amendments in the following scenarios: Scenario 3 (indoor small BSS hotspot) Baseline: 100% non-11ax APs and 100% non-11ax STAs. 11ax: 100% 11ax APs and 50% 11ax STAs. Scenario 2 (enterprise) Baseline: 100% non-11ax APs and 100% non-11ax STAs. 11ax:100% 11ax APs and 50% 11ax STAs. Joseph Levy (InterDigital)

10 Proposed Requirement R2 Spectral frequency reuse
September 2014 Proposed Requirement R2 Spectral frequency reuse The ax amendment shall provide a mechanism to improve by at least 10% the spectral frequency reuse in efficiency in 20 MHz and larger frequency channels in the following scenarios: Scenario 2 (enterprise) Baseline: 100% non-11ax APs and 100% non-11ax STAs. 11ax:100% 11ax APs and 50% 11ax STAs. Joseph Levy (InterDigital)

11 September 2014 Conclusion Without agreed well defined requirements there is no criteria to judge the merit of the technical contributions. We have provided a set of reasonable meaningful functional requirements in 11-14/xxxxr1 Without criteria to judge the technical merit of contributions we do not see how the current ax process will be able to move forward in an open and fair manner. Joseph Levy (InterDigital)

12 September 2014 doc.: IEEE /1234r0 September 2014 References 11-14/0938r4, ax Selection Procedure, Rolf de Vegt (Qualcomm), 17 Jul 2014 11-08/1392r0, Inputs for a VHT Selection Procedure, Rolf de Vegt (Qualcomm), 12 Nov 2008 11-09/0059r4, ac Proposed Selection Procedure, Rolf de Vegt (Qualcomm), 11 Mar 2009 11-09/0541r16, TGac Functional Requirements and Evaluation Methodology, Peter Loc (Ralink Technology) Minho Cheong (ETRI) 19 Jan 2011 hew hew-sg-proposed-par hew-ieee hew-sg-proposed-csd hew-hew-sg-usage-models-and-requirements- liaison-with-wfa Joseph Levy (InterDigital) Joseph Levy (InterDigital)

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