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MU-MIMO support for Heterogeneous Devices

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					Nov 2010                                                                                   doc.: IEEE 802.11-10/1277r0


  MU-MIMO support for Heterogeneous Devices
                                                 Date: 2010-11-09
Authors:
  Name               Affiliations     Address                                        Phone            email
                                      LG R&D Complex 533, Hogye -1dong,
                                                                                     +82-31-450-
  Byeongwoo Kang     LG Electronics   Dongan-Gu, Anyang-Shi, Kyungki -Do, 431-                        byeongwoo.kang@lge.com
                                                                                     4131
                                      749, Korea
                                      LG R&D Complex 533, Hogye -1dong,
                                                                                     +82-31-450-
  Daewon Lee         LG Electronics   Dongan-Gu, Anyang-Shi, Kyungki -Do, 431-                        daewon.lee@lge.com
                                                                                     7897
                                      749, Korea
                                      LG R&D Complex 533, Hogye -1dong,
                                                                                     +82-31-450-
  Yongho Seok        LG Electronics   Dongan-Gu, Anyang-Shi, Kyungki -Do, 431-                        yongho.seok@lge.com
                                                                                     1947
                                      749, Korea
                                      10225 Willow Creek Rd, San Diego, CA           +1-858-386-
  Dong Wook Roh      LG Electronics                                                                   dongwook.roh@lge.com
                                      92131 USA                                      8228
                                      1700 Technology Drive                          +1-408-830-
  Youhan Kim         Atheros                                                                          youhan.kim@atheros.com
                                      San Jose, CA 95110                             5835
                                      16340 West Bernardo Dr., San Diego, CA         +1-858-521-
  Vinko Erceg        Broadcom                                                                         verceg@broadcom.com
                                      92127                                          5885
                                      161 Gajeong-dong, Yuseong-gu, Daejeon,         +82 42 860
  Minho Cheong       ETRI                                                                             minho@etri.re.kr
                                      Korea                                          5635
                                      2111 NE 25th Ave, Hillsboro OR, 97124,
  Eldad Perahia      Intel                                                                            eldad.perahia@intel.com
                                      USA
                                      5488 Marvell Lane                              +1-408-222-
  Raja Banerjea      Marvell                                                                          rajab@marvell.com
                                      Santa Clara CA, 95054                          3713

  VK Jones           Qualcomm         3165 Kifer Road, Santa Clara, CA 95051                          vkjones@qualcomm.com

                                      Mt. 14-1 Nongseo-Dong, Giheung-Gu,
  Youngsoo Kim       Samsung                                                                          youngsookim@samsung.com
                                      Yongin-Si, Gyeonggi-Do, Korea 339-712
                                      170 W Tasman Dr, San Jose, CA, 95134,
  Brian Hart         Cisco Systems                                                   1-408-5253346    brianh@cisco.com
                                      USA
                                      2860 Junction Ave, San Jose, CA 95134,         +1-408-526-
  Vish Ponnampalam   Mediatek                                                                         vish.ponnampalam@mediatek.com
                                      USA                                            1899
                                      2525 Augustine Drive, Santa Clara CA           +1.408.893.935
  George Vlantis     ST-Ericsson                                                                      George.Vlantis@st.com
                                      95054                                          7
                                      9120 Irvine Center Dr., Ste. 200, Irvine, CA
  Sean Coffey        Realtek
                                      92618                                                           coffey@realtek.com


Submission                                                       Slide 1                                  Byeongwoo Kang, LG Electronics
Nov 2010                                            doc.: IEEE 802.11-10/1277r0


             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
Submission                               Slide 2             Byeongwoo Kang, LG Electronics
Nov 2010                                                 doc.: IEEE 802.11-10/1277r0


 Multi-encoder Transmission for MU-MIMO (1/2)

 • Case study
       – STA #1 only supports BCC decoding
       – STA #2 supports BCC and LDPC decoding
       – AP wants to pair STA #1 and #2 for MU-MIMO transmission
                    For AP to pair STA with different
                   capability which Enc should it use?




                                                         STA
                                                     (BCC support)



                                         STA
                                  (BCC+LDPC support)

Submission                               Slide 3                     Byeongwoo Kang, LG Electronics
Nov 2010                                            doc.: IEEE 802.11-10/1277r0


 Multi-encoder Transmission for MU-MIMO (2/2)

 • Allowing supporting STAs with different decoder capability at the
   AP keeps full utilization of LDPC at the STA
       – STA #1 uses BCC while STA #2 can utilize LDPC


 • Considering in difficulties for vendors to support LDPC capability
   restricting the use cases for LDPC is not attractive
       – LDPC decoders typically require large gate counts in ASIC design




Submission                             Slide 4              Byeongwoo Kang, LG Electronics
Nov 2010                                              doc.: IEEE 802.11-10/1277r0


                     VHT-SIG design aspects

 • Parameter design guides and consideration for VHT-
   SIG-A
       – Current specification framework document (r15)
             • 2 bits of coding bit (1 bit dedicate to resolve number of LDPC OFDM
               symbols)
             • Up to 4 simultaneous STA scheduling


       – For most flexible BCC and LDPC support for MU-MIMO
         transmissions following indication in VHT-SIG is needed
             • 1 bit for BCC/LDPC indication for SU-MIMO
             • 4 bits for BCC/LDPC indication for MU-MIMO (1 bit for each user
               respectively)

Submission                               Slide 5              Byeongwoo Kang, LG Electronics
Nov 2010                                                                            doc.: IEEE 802.11-10/1277r0


               Proposed SIG-A2 Field Design

 • With the propose changes AP has the flexibility to support
   simultaneous BCC and LDPC encoded MU-MIMO transmission
       – For SU-MIMO existing 1 bit can be used
       – For MU-MIMO existing 1 bit and 3 bits from reserved bits in SIG-A2 can be used
                                                      VHT-SIG-A2

                                 Set B0 to 0 for Long GI, set to 1 for Short GI
                Short GI     2
                                 Set B1 to 1 when Short GI and Nsym%10 == 9

                                 For SU: Set B2 to 0 for BCC, set to 1 for LDPC
                Coding       2   For MU : Set B2 to 0 for BCC, set to 1 for LDPC for 1st user
                                 B3 purpose is under discussion

                                 For SU/Broadcast/Multicast: MCS index
                                 For MU :
                                 Set B4 to 0 for BCC, set to 1 for LDPC for 2nd user
                 MCS         4
                                 Set B5 to 0 for BCC, set to 1 for LDPC for 3rd user
                                 Set B6 to 0 for BCC, set to 1 for LDPC for 4th user
                                 B7 reserved and set to 1

                                 Set to 1 when packet is a SU-beamformed packet
             SU-Beamformed   1   Set to 0 otherwise
                                 For MU: Reserved, set to 1

               Reserved      1   Set to 1

                 CRC         8   CRC calculated as in 11n Section 20.3.9.4.4 with C7 in B10

                  Tail       6   All zeros


Submission                                              Slide 6                                 Byeongwoo Kang, LG Electronics
Nov 2010                                                doc.: IEEE 802.11-10/1277r0


                                  Pre-Motion

 • Do you agree to redefine the VHT-SIG-A2 bit B2, B4, B5, and B6
   in the specification framework document r15 to be described as
   following?
       – For SU:
          • B2: Set to 0 for BCC, 1 for LDPC
       – For MU:
          • B2: Set to 0 for BCC, 1 for LDPC for the 1st user
          • B4: Set to 0 for BCC, 1 for LDPC for the 2nd user
          • B5: Set to 0 for BCC, 1 for LDPC for the 3rd user
          • B6: Set to 0 for BCC, 1 for LDPC for the 4th user
       – Note: if user 1, 2, 3, and/or 4 has 0 Nsts value, then corresponding bit is
         reserved and set to 1

       – Yes: No:      Abstain:
Submission                                Slide 7                Byeongwoo Kang, LG Electronics

				
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