1 / 9

RTS&CTS Exchange in wideband transmission

RTS&CTS Exchange in wideband transmission. Date: 2010-09-15. Authors:. Abstract. 802.11ac is supposed to provide v ery h igh t hroughput, which requires to use wideband as much as possible.

halfacre
Download Presentation

RTS&CTS Exchange in wideband transmission

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. RTS&CTS Exchange in wideband transmission Date: 2010-09-15 Authors: Li Nan, ZTE Corporation

  2. Abstract • 802.11ac is supposed to provide very high throughput, which requires to use wideband as much as possible. • When OBSS exists, the OBSS channel distribution and interference on Tx side might be different with that of Rx side, which is even complex when wideband is used. • The 11n OBSS protection mechanism needs extension to adopt to wideband case. A practical RTS/CTS mechanism for wideband in OBSS case is proposed in this contribution. Li Nan, ZTE Corporation

  3. Sep, 2010 Wider Bandwidth Transmission Pros vs. Cons • Pros: • Very high throughput in data transmission. • Cons: • Less opportunity to transmit since requesting more clean channels, which might impact guaranteed QoS. • Difficult tradeoff between bandwidth usage flexibility and bandwidth efficiency. Li Nan, ZTE Corporation

  4. Sep, 2010 Complex OBSS scenarios with Wideband Transmission • WLAN devices working on 5GHz might be: –802.11a compliant:20MHz channels –802.11n compliant: 20/40MHz channels –802.11ac compliant: 20/40/80/160MHz channels • If OBSS exists, the interfered channels are very likely different on Tx side from Rx side.

  5. Sep, 2010 Example of hidden node issues on Tx/Rx side Li Nan, ZTE Corporation

  6. Sep, 2010 Example of hidden node issues on Rx side • AP1 and STA1 transmit with 80MHz channel width, while AP2 and STA2 transmit with 40MHz channel width • AP2 starts a 40MHz BSS , its selected primary channel could be different from AP1’s because AP2 is outside AP1’s coverage • However, transmission between AP2 and STA2 affects transmission between AP1 and STA1 because of the overlap of STA1 and STA2 Li Nan, ZTE Corporation

  7. Duplicated RTS/CTS scheme extension • TX STA sends duplicated RTS to RX STA on all idle channels within the working bandwidth. • RX STA detects RTS on primary and secondary (optional) channel(s) and sends duplicated CTS on channels which • is indicated as available channels by received RTS, or the RTS(s) has been received on, and • is detected as idle by RX STA John Doe, Some Company

  8. Sep, 2010 Proposed RTS/CTS Extension • TxSTA sends RTS on primary channel at least. • Tx STA sends RTS(s) on all other 20MHz idle channels detected by any meanswithin working bandwidth. • Rx STA responds CTS(s) on each20MHz channel which • Is indicated as available channels by received RTS, or the RTS(s) has been received on, and • is detected as idle by RX STA Li Nan, ZTE Corporation

  9. Sep, 2010 Thank you! Li Nan, ZTE Corporation

More Related