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Efficient Frame Format for MU Transmission

Efficient Frame Format for MU Transmission. Authors:. Date: 2010-11-08. Abstract. MU-MIMO is a key technique to attain at least 1 Gbps throughput at MAC SAP for Multi-STA. But, the gain of MU-MIMO maybe shrink significantly due to mismatching of the lengths of co-transmission STA’s PSDU.

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Efficient Frame Format for MU Transmission

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  1. Efficient Frame Format for MU Transmission Authors: Date: 2010-11-08

  2. Abstract • MU-MIMO is a key technique to attain at least 1 Gbps throughput at MAC SAP for Multi-STA. • But, the gain of MU-MIMO maybe shrink significantly due to mismatching of the lengths of co-transmission STA’s PSDU. • A sustainable frame format is proposed here to exploit the gain of MU-MIMO against the mismatching problem for co-transmission STAs

  3. The mismatching problem • There exists a mismatching problem for MU-MIMO transmission for 802.11ac due to mismatching the lengths of co-transmission STA’s PSDU. • An example is given here: • STA1’s transmission rate is 500Mbps and 400Mbps for SU-MIMO and MU-MIMO transmission, respectively • STA2’s transmission rate is assumed as same as that of STA1 for simple. • PSDU data length of STA1 is 2000 kb, therefore 5ms for MU-MIMO transmission • PSDU data length of STA2 is 800 kb, therefore 2ms for MU-MIMO transmission STA 1 STA1-PSDU STA 2 STA2-PSDU

  4. Transmission schemes for Multi-STA with mismatching lengths of their PSDU • Direct transmission utilizing MU-MIMO • The LENGTH field in L-SIG is set according the maximum among the lengths of these multi-STA’s PSDU • The LENGTH field in each STA’s VHT-SIG-B is set according the actual length of the STA’s PSDU • The transmission duration for the example is 5ms • Direct transmission utilizing SU-MIMO for each STA in turn • The transmission duration for the example is 5.6mswithout accounting for the overheads of preamble, SIFS, etc. STA1-PSDU STA2-PSDU

  5. An efficient transmission scheme based on a new frame format • A new frame format with sustainable VHT-segment proposed here: • A series of VHT-segments with the maximum of 4 can be concatenated together to form the whole frame. • Each VHT-segment consists of VHT-SIG-A, VHT-STF, VHT-LTFs, VHT-SIG-B and VHT data

  6. An efficient transmission scheme based on a new frame format (con’t) • A new frame format with sustainable VHT-segment proposed here: • The LENGTH field in L-SIG is set according to the total length of the whole frame consisted of all VHT-segments

  7. An efficient transmission scheme based on a new frame format (con’t) • A new frame format with sustainable VHT-segment proposed here: • Each STA’s NSTS field in VHT-SIG-A implies whether its PSDU has been ended or not

  8. An efficient transmission scheme based on a new frame format (con’t) • A new frame format with sustainable VHT-segment proposed here: • The length field in VHT-SIG-B of each VHT-segment indicates the actual length of VHT-data in current VHT-segment.

  9. Gain and Conclusion • The transmission duration for the former example is 4.4ms, therefore a gain of more than 10% can be obtained. • Although the transmission scheme based on the proposed frame format is somewhat like MU-TXOP, but it is superior to MU-TXOP due to omitting SIFS, L-STF and L-LTF. • Nevertheless, TXOP/MU-TXOP isn’t substitutable in providing continuous transmission with longer duration (for example more than 5.4ms).

  10. References • Specification Framework for TGac, IEEE 802.11-09/0992r15, September 2010

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