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MU-MIMO support for Heterogeneous Devices

MU-MIMO support for Heterogeneous Devices. Authors:. Date: 2010-07-13. Abstract. Potential Usage Model for MU-MIMO Support MU-MIMO with Heterogeneous Devices Multi-encoder Single Guard Interval Multi-SS/MCS Multi-band VHT-SIG design Aspects. Potential Usage Model for MU-MIMO.

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MU-MIMO support for Heterogeneous Devices

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  1. MU-MIMO support for Heterogeneous Devices Authors: Date: 2010-07-13 Byeongwoo Kang, LG Electronics

  2. Abstract • Potential Usage Model for MU-MIMO • Support MU-MIMO with Heterogeneous Devices • Multi-encoder • Single Guard Interval • Multi-SS/MCS • Multi-band • VHT-SIG design Aspects Byeongwoo Kang, LG Electronics

  3. Potential Usage Model for MU-MIMO • MU-MIMO may be able to support simultaneous multi-link peer-to-peer transmission for throughput enhancement • Various heterogeneous devices in a typical networked home scenarios (e.g. DTV, PC and handheld devices) • Each device may have different capabilities (e.g. supported channel bandwidth, MCS, FEC, etc) • It may be not typical to support MU-MIMO with all same capabilities STA AP STA STA Byeongwoo Kang, LG Electronics

  4. Support MU-MIMO with Heterogeneous Devices • Various heterogeneous devices with different channel bandwidth, MCS and FEC are scattered in a typical networked home scenarios (e.g. DTVs, PCs, and handheld devices) • MU-MIMO support for heterogeneous devices will be most practical and important for good User Experience • e.g. support seamless streaming (transmission not interrupted in order to support data for small devices) of HD multimedia 20MHz, BCC 80MHz, LDPC MU-MIMO AP 40MHz, BCC Byeongwoo Kang, LG Electronics

  5. Multi-encoder Transmission • STA will have the choice to additionally support LDPC (BCC mandatory) • Two Methods of supporting Multi-encoder transmission • VHT-SIG-B indication of FEC type for each STA • 1 bit FEC field in VHT-SIG-A • STAs which do not support LDPC always decode with BCC regardless of FEC bit • STAs which support LDPC follow directions of FEC bit Byeongwoo Kang, LG Electronics

  6. Single Guard Interval Transmission (1/3) • In case of the multiple GT duration • In case of the single GT duration Byeongwoo Kang, LG Electronics

  7. Single Guard Interval Transmission (2/3) • Consideration aspects to support the multiple GI duration • At the transmitter side • Different processing chains for the STAs having long GI duration or short GT duration • Boundary of OFDM symbols between different GT durations are not aligned • Spurious Spatial Interference in OFDM symbol boundaries for MU-MIMO between Spatial stream in case frequency selective precoding is applied Byeongwoo Kang, LG Electronics

  8. Single Guard Interval Transmission (3/3) • Consideration aspects to support the multiple GI duration • At the receiver side • GI is needed to get frequency data symbols • Having GI in VHT-SIG-B may cause decoding complexity issues (highly dependent on implementation) • GI information may be needed in VHT-SIG-A • General Observation • Single GT Duration transmission for MU-MIMO feature is useful Byeongwoo Kang, LG Electronics

  9. Multi-SS/MCS Transmission • Nothing additional needs to be done • Variable # of Spatial Streams per STA already supported • Different MCS per STA already supported Byeongwoo Kang, LG Electronics

  10. Single Channel Bandwidth Transmission • It is assumed that we allow a Group involving STAs with different channel bandwidth capabilities for MU-MIMO support • AP does not transmit its data packet to STAs with lower CB capability Case 1: AP transmits 20MHz data packet to STA1, STA2, STA3 and STA4 Case 2: AP transmits 40MHz data packet To STA2, STA3 and STA4 Case 3: AP transmits 80MHz data packet To STA4 Byeongwoo Kang, LG Electronics

  11. Multi-BW Transmission Example 1 • It is assumed that we allow a Group involving STAs with different channel bandwidth capabilities for MU-MIMO support • 20MHz CB indication in VHT-SIG-A • Both STA1 and STA2 receive 20MHz data packet • Frequency • STA 1 with 20MHz CB capability • STA 2 • STA 2 with 80MHz CB capability • STA 1 • Time • User Byeongwoo Kang, LG Electronics

  12. Multi-BW Transmission Example 2 • 40MHz CB indication in VHT-SIG-A • For STA2 with 80MHz CB capability, receive 40MHz data packet • For STA1 with 20MHz CB capability, receive 20MHz data packet • STA 2 • Frequency • STA 1 with 20MHz CB capability • STA 1 • STA 2 with 80MHz CB capability • Time • User Byeongwoo Kang, LG Electronics

  13. Multi-BW Transmission Support • AP are allowed to transmit the different size of data packet to even STAs with lower CB capability as well comparing with CB indication in VHT SIG-A AP transmits 20MHz data packet to STA 1 AP transmits 40MHz data packet to STA 2 and STA 3 AP transmits 20MHz data packet to STA 4 Byeongwoo Kang, LG Electronics

  14. VHT-SIG-A Design for Multi-BW Transmission • Method of MU-MIMO support with heterogeneous devices • STA can choose minimum value between the signaled CB and the maximum usable CB of STA • The signaled CB can be the channel bandwidth indication in VHT-SIG-A • The max usable CB of STA can be from the Channel Width information in Notify Channel Width frame • Note : STA sends the Notify Channel Width frame to another AP/STA(s) to indicate the channel width it is able to receive Channel Bandwidth to be used = min (signaled CB, max usable CB of STA) Byeongwoo Kang, LG Electronics

  15. VHT-SIG design aspects • Parameter design guides and consideration for VHT-SIG-A and VHT-SIG B • Practical usage model for MU-MIMO with heterogeneous devices • Multi-encoder • Option 1: 1 bit FEC field in VHT-SIG-A for all STAs • Option 2: 1bit FEC field in VHT-SIG-B for each STA • Multi-band • Bandwidth field is determined to be included in VHT-SIG-A • Multi-SS/MCS • Different MCS per STA supported in VHT-SIG-B • Multiple spatial stream per STA supported in VHT-SIG-A • Single Guard Time duration in VHT-SIG-A will be suitable for all STAs Byeongwoo Kang, LG Electronics

  16. Summary • MU-MIMO support for heterogeneous devices will be most practical and important in a typical networked home scenarios • Multi-encoder • Multi-SS/MCS • Multi-band • Single Guard Time duration Byeongwoo Kang, LG Electronics

  17. Strawpoll #1 • Do you support adopting multi-encoder MU-MIMO transmissions and edit the spec framework document, 11-09-0992 with following text? • R4.D: DL MU-MIMO shall not restrict the transmission encoder type for STA(s) with LDPC encoding/decoding capability in case that said STA(s) is being paired by MU-MIMO transmission with STA(s) which do not have LDPC encoding/decoding capability • Yes • No • Abstain Byeongwoo Kang, LG Electronics

  18. Strawpoll #2 • Do you support adopting same GI configuration transmission for all spatial streams for both SU-MIMO and MU-MIMO transmissions and edit the spec framework document, 11-09-0992 with following text? • R4.E: DL MU-MIMO shall only support the same Guard Interval (GI) for all spatial stream regardless of STA capability. • Yes • No • Abstain Byeongwoo Kang, LG Electronics

  19. Strawpoll #3 • Do you support adopting multi-bandwidth transmission for different STAs which do not all support the maximum BW of the DL MU-MIMO transmission and edit the spec framework document, 11-09-0992 with following text? • R4.F: DL MU-MIMO shall support potential transmission of different bandwidth for different set of spatial streams associated with different STA which do not have the same BW capability. The exact supported bandwidth combinations of DL MU-MIMO transmission and signaling and mechanisms of how to support multi-bandwidth DL MU-MIMO transmission is TBD. • Yes • No • Abstain Byeongwoo Kang, LG Electronics

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