Framework for NG60 Channel Bonding
Alireza Tarighat, Broadcom
Slide1
Authors:
March 9, 2015
Contents
Channel bonding options in NG60Implementation variationsKey comparison metricsSummary
Alireza Tarighat, Broadcom
Slide2
March 9, 2015
Channel Bonding Options
Alireza Tarighat, Broadcom
Slide3
0.88GHz
0Hz
2.16GHz
1.28GHz
0.4GHz
1x 11ad channelfchip= 1.76Gsps
3.92GHz
2.2x contiguous bondingOne contiguous 3.92GHz channelfchip= 3.92Gsps
3.52GHz
2xcontiguous bondingOne contiguous3.52GHzchannelfchip= 3.52Gsps
0.88GHz
0Hz
2.16GHz
1.28GHz
0.4GHz
2x aggregationFrequency carrier aggregationfchip=1.76Gsps
*Only payload spectrum shown.
March 9, 2015
Channel Bonding Implementations (1/2)
Alireza Tarighat, Broadcom
Slide4
Single-Stream 2x-Wide RF
3.92GHz
Single-Stream 2X-Wide RF
0Hz
2.16GHz
0.4GHz
2.2x contiguous
2xaggregation
March 9, 2015
Generated digitally
Generated digitally
Channel Bonding Implementations (2/2)
Alireza Tarighat, Broadcom
Slide5
Two-Stream 1x-Wide RF
0Hz
2.16Hz
Two-Stream 1x-Wide RF
0Hz
2.16Hz
March 9, 2015
Key Comparison Metrics (1/3)
Bandwidth utilization2.2x contiguous achieves 10% higher throughput than 2x contiguous and 2x aggregationPower density (translating to range)Single-stream RF: 2.2x contiguous provides better power density that 2x aggregation (due to lower back-off required by contiguous waveform)Two-stream RF: 2x aggregation provides better power density than 2.2x contiguousRF/analog design effortContiguous 2.2x requires faster converters and tighter RF impairments (flatness, IQ imbalances)RF power consumptionSingle-stream RF consumes less current than two-stream RFChannel sensing2x aggregation allows for simultaneous sensing and detection of two legacy 11ad channels
Alireza Tarighat, Broadcom
Slide6
March 9, 2015
Key Comparison Metrics(2/3)
Digitaldesign effortSame 11ad digital blocks can be reused for 2xaggregation2.2x contiguous requires additional modem developmentDigital power consumptionAll digital filters2x aggregation draws 2x current vs single 11ad2.2x contiguous draws >3x current vs single 11adOthers (to be analyzed)Frequency dispersion in beam pattern gain @ channel edgeWider channel leads to more severe frequency dispersion with single-stream RF.Overalldevelopmenteffort2x aggregation modewould require less development effort/complexity
Alireza Tarighat, Broadcom
Slide7
March 9, 2015
Key Comparison Metrics(3/3)
Packetframe design2.2x contiguous will require new format designMaintaining legacySTF/CE may require higher backoff (diminishing backoff advantage in single-stream RF implementation).Or lower power during STF compared to payloadEqualization for SC mode2xcontiguousmode maybe more challenging compared to aggregation mode.Phase noise integration (and other RF impairments)Higher integrated phase noise in contiguous mode.
Alireza Tarighat, Broadcom
Slide8
March 9, 2015
Summary
We proposeconsidering 2.2x/2xcontiguous mode as it is beneficial toseveralusages andimplementations (specially in the long term)Mandatory vs. optional to be discussed.Additionally, we propose enabling 2x carrier aggregation mode in NG60, given its advantages with some RF implementations and usagesMandatoryvs. optional to be discussed.Overhead to spec is minimal as this will be a subset (reuse) of 2x2 MIMO spatial aggregation mode.Same standard framework and HW designed and deployed for 2x2 MIMO can be re-used in this mode.2xcarrier aggregation enables noncontiguous channel bonding.2x carrier aggregation can enable both SC and OFDM modes (no change to OFDM parameters or FFT size).Control mechanism in aggregation mode to be discussed.
Alireza Tarighat, Broadcom
Slide9
March 9, 2015
0
Embed
Upload