Enhanced Long Range Design Targets in IEEE 802.11-24/0873r2 April 2024 Document
Explore the design targets and considerations for enhanced long-range capabilities in IEEE 802.11-24/0873r2 during April 2024. The document addresses the need to improve uplink range, link budget imbalances, and operational modes in different frequency bands. It suggests introducing new data rates, operational modes, and PPDU formats to enable more efficient and cost-effective devices with enhanced long-range features.
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April 2024 doc.: IEEE 802.11-24/0873r2 Design Targets and Considerations for Enhanced Long Range Date: 2024-04-08 Authors: Name Affiliations Address Phone Email Jianhan Liu jianhan.liu@mediatek.com Shengquan Hu Mediatek Alex Tseng Thomas Pare Submission Slide 1 Jianhan Liu, Mediatek Inc.
April 2024 doc.: IEEE 802.11-24/0873r2 Needs of Enhanced Long Range (ELR) in 11bn Enhanced long range [1] had been brought up in UHR study group. Need to improve the range of uplink to overcome the link budget imbalance between downlink and uplink AP in general transmits higher power (with external PA) than non-AP STAs (mostly with integrated CMOS PA). Link budget difference between downlink and uplink can be 6dB. In many regulatory domains, APs are allowed to transmit with higher power or higher power spectrum density than those of non-AP STAs . Many people had the bad experience that their Wi-Fi devices can not communicate with AP even the Wi-Fi signal strength showing one or two bars. Enhanced long range to achieve higher efficiency and better power save and coexistence than 11b. 11b is designed two decades ago. We can design an enhance long range solution to have high data rate than 11b at the similar range. Submission Slide 2 Jianhan Liu, Mediatek Inc.
April 2024 doc.: IEEE 802.11-24/0873r2 On ELR Data Rates For a 20MHz transmission, from lowest rate of 11a/g is 6Mbps and the rate of 11b is 1Mbps. We propose to introduce at least two ELR date rates to balance the downlink and uplink link margin difference. ELR Design Target ELR Rate 1 ELR Rate 2 11b 11a/g MCS0 PHY Rate ~1.5Mbps ~3.0Mbps 1Mbps 6Mbps Range 6dB Better 3dB Better 6dB Better 0dB (Compared to 11a/g) Submission Slide 3 Jianhan Liu, Mediatek Inc.
April 2024 doc.: IEEE 802.11-24/0873r2 On ELR Operational Modes and Bands Since the downlink and uplink link margin imbalance existed in 2.4GHz, 5GHz and 6GHz, ELR should be enabled in all the11bn operational bands, i.e., 2.4GHz, 5GHz and 6GHz. Since ELR PPDU is 20MHz PPDU, to reduce the airtime occupied by transmissions of ELR packets, we propose to limit the transmission of ELR PPDU to be uplink only in 5GHz and 6GHz. Note that in 5GHz and 6GHz, large bandwidth transmissions are in favor. To enable more efficient cost-effective devices, we propose to enable ELR transmission in both uplink and downlink in 2.4GHz. Compared to 5GHz and 6GHz, transmission in 2.4GHz can reach longer range. In 2,4GHz, transmissions are mostly 20MHz or 40MHz. To reduce the complexity of beacon transmission, we propose to limit the coverage of ELR is like 11b. No extra beacon is needed. Submission Slide 4 Jianhan Liu, Mediatek Inc.
April 2024 doc.: IEEE 802.11-24/0873r2 On ELR PPDU Format and Design Considerations Each ELR PPDU is composed of three function blocks: Legacy preamble, ELR preamble and ELR data. ELR PPDU needs to be co-existed with legacy Wi-Fi devices. Legacy Preamble ELR Preamble ELR Data We prefer to simple ELR design with least changes and complexity. Prefer to ELR PPDU using 20MHz bandwidth due to PSD limits in many regulatory domains. Prefer to using the existing MCSs. Submission Slide 5 Jianhan Liu, Mediatek Inc.
April 2024 doc.: IEEE 802.11-24/0873r2 Summary We propose to introduce enhanced long range (ELR) to compensate the link margin imbalance between downlink and uplink. Also bring higher efficiency with similar range as 11b. We discussed the ELR Data Rates, ELR operational modes, ELR operational bands and ELR design considerations. Submission Slide 6 Jianhan Liu, Mediatek Inc.
April 2024 doc.: IEEE 802.11-24/0873r2 Straw Poll #1 Do you support to include the following in the 11bn SFD? Define Enhanced Long Range (ELR) PPDU and potentially other Range Extension mechanisms. Submission Slide 7 Jianhan Liu, Mediatek Inc.
April 2024 doc.: IEEE 802.11-24/0873r2 Straw Poll #2 Do you agree to introduce enhanced long range (ELR) in IEEE 802.11bn with the following design targets? Downlink and Uplink in 2.4GHz (within BSS range with 11b beacon) Uplink only in 5GHz and 6GHz bands Minimum data rate is close but higher than 1.5Mbps Submission Slide 8 Jianhan Liu, Mediatek Inc.
April 2024 doc.: IEEE 802.11-24/0873r2 References [1] Jianhan Liu, etc., Enhanced Long Range-Usage Scenarios, Design Target and Feasibility , 11-22-1928-01. Submission Slide 9 Jianhan Liu, Mediatek Inc.
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