Slide 1 Discussion on Frame Structure for Future WLAN Systems with OFDMA Date 20141031 Authors Month Year MyeongJin Kim Korea University Slide 2 Abstract This contribution discusses on frame structure of OFDMA in HEW to enhance the efficiency of WLAN systems ID: 1019556
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1. Month YearMyeong-Jin Kim, Korea UniversitySlide 1Discussion on Frame Structure for Future WLAN Systems with OFDMADate: 2014-10-31Authors:
2. Month YearMyeong-Jin Kim, Korea UniversitySlide 2AbstractThis contribution discusses on frame structure of OFDMA in HEW to enhance the efficiency of WLAN systems.
3. Month YearMyeong-Jin Kim, Korea UniversitySlide 3OFDMA in HEWOFDMA is crucial technology for high efficient WLAN802.11ax has considered OFDMA for efficient use of spectrum resources and spectral frequency reuse. In order to serve users having different link quality, the following TXVECTOR parameters should be considered as user-specific values MCS: indicates the modulation and coding schemeNUM_STS: indicates the number of space-time streamsSTBC: indicates whether STBC is usedFEC_CODING: indicates which FEC encoding is usedHow to determine user-specific values?
4. Month YearMyeong-Jin Kim, Korea UniversitySlide 4UL MU Transmission in HEW802.11ax has discussed UL MU transmission and issues to support UL MU transmission.Issue on synchronization for UL MU transmissionTime synchronizationFrequency synchronizationPower synchronizationSolution(s) for synchronization in UL MU transmissionLonger CP sizeAdjustment procedure for synchronizationUL MU only for STAs who are sufficiently synchronizedAnother solution with OFDMA?
5. Month YearMyeong-Jin Kim, Korea UniversitySlide 5Frame Structure Example to Solve Previous Mentioned ProblemsProposed frame structure with OFDMA- To assign control channel which is separated from data subchannelsSubcarrier logical numberOFDMA symbol numberControl subchannel Data subchannel Data subchannel Data subchannel
6. Month YearMyeong-Jin Kim, Korea UniversitySlide 6ConclusionWe discussed frame structure of OFDMA to enhance efficiency in HEW.In order to serve users having different link quality and support UL MU transmission, we need to discuss frame structure of OFDMA.We introduced a example of OFDMA frame structure.
7. Month YearMyeong-Jin Kim, Korea UniversitySlide 7References[1] IEEE 802.11-13/1382r0 , "Discussion on OFDMA in HEW"[2] IEEE 802.11-14/1210r1 , "HEW PPDU Format for Supporting MIMO-OFDMA"[3] IEEE 802.11-13/1388r1, "Uplink Multi-User Transmission“[4] IEEE 802.11-14/0802r0, "Consideration on UL MU Transmission“