CL MIMO operation scenarios IEEE 802 16 Presentation

CL MIMO operation scenarios IEEE 802. 16 Presentation Submission Template (Rev. 9) Document Number: IEEE C 802. 16 maint-08/219 Date Submitted: 2008 -04 -19 Source: Kathiravetpillai Sivanesan, Peiying Zhu and Sang Youb Kim Voice: +1 -972 -684 2004 Nortel networks E-mail: kathirsi<at>nortel. com 2221 Lakeside Blvd. Richardson, TX 75082, USA Venue: IEEE 802. 16 maint-08/xxx, “[Maintenance Task group and MIMO Rapportur group] IEEE 802. 16 Rev 2/D 4, Letter Ballot 26 c. Technical Comments”. Base Contribution: None Purpose: For discussion in maintenance task group Notice: This document does not represent the agreed views of the IEEE 802. 16 Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802. 16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http: //standards. ieee. org/guides/bylaws/sect 6 -7. html#6> and <http: //standards. ieee. org/guides/opman/sect 6. html#6. 3>. Further information is located at <http: //standards. ieee. org/board/pat-material. html> and <http: //standards. ieee. org/board/pat >.

CL-MIMO Operation Scenarios Nortel Networks

What has been fixed in last recirculation • CL-MIMO is used in band AMC (2 X 3) permutation • CL-MIMO channel state information (PMI, CQI) are estimated from the midamble • Matrix A support and granularity for the band AMC

What needs to be fixed • The feedback content and granularity of the feedback – – How many best bands PMI CQI Rank • Feedback mechanism – Feedback header (types 0110, 1011) – Primary CQICH – Secondary CQICH

What is in the current draft and the issues • Feedback mechanisms – Feedback header type 0110 • 12 bits bitmap and maximum 4 CQI’s are reported • Rank and MIMO type are not reported – Feedback header type 1101 – CL MIMO type 010 • 1 average CQI (5 bits), 1 wideband PMI(6 bits), and wideband rank (2 bits) are reported • The Wideband reporting doesn’t show the gains of the CL-MIMO – (doesn’t leverage the gains of the frequency selective scheduling) – REP-REQ, REP-RSP messages • • Type 2. 2: 12 bits bitmap and 4 bestband CQI’s (20 bits) Type 2. 4: 12 bits bitmap and 5 bestband CQI’s (25 bits) Rank and MIMO type are not reported Overhead is high – needs to send REP-REQ to get the report every time

What is in the current draft and the issues – CQICH channel (6 bits) • Enhanced CQICH – 1 bit differential CQI (+/- 1 d. B) for 5 best bands (page 829) • Primary and secondary CQICH – 1 bit differential CQI (+/- 1 d. B) for 4 or 5 best bands (page 416) – 3 bits or 6 bits PMI feedback (Type 0 b 100) (page 165) • Rank reporting is done by puncturing the special code on the CQICH channel • The number of best bands needs to be clarified – Secondary CQICH channel (4 bits) • 3 bits PMI feedback (page 818) • Rank reporting is done by puncturing the special code on the CQICH channel • Only 3 bits codebook transmission possible

Operation scenario 1/2 • CQI and Best band reporting – Once in every N (configurable number) frames over feedback header type 0110 • • 3 X 5 bits – 3 best band CQIs 12 bits -- Bit map 2 bits -- MIMO type 3 bits -- rank for the 3 best bands

Operation scenario 2/2 • PMI reporting – In every frames there are two options – Option 1 • Using Feedback header type 1101 – 6 X 3 bits -- 3 best band PMIs – 3 X 2 bits -- 2 bits differential CQI per band for those 3 best bands – 8 bits -- reserved bits – Option 2 • Using Primary and Secondary CQICH – 6 bits - 1 PMI for the 3 best bands over primary CQICH – 3 X 1 bits – I bit differential CQI per band for the 3 best band over secondary CQICH – 1 bit - Reserved

Option 1 : Operation example A Feedback_Polling_IE to de-allocate the feedback BS Feedback_Polling_IE Feedback header for type 1101 Feedback header for type 0110 MS … … • MS sends feedback type 0110 by overriding the • With feedback type = 1101 requested feedback type 1101 • BS decides feedback periodicity • initial best AMC bends reporting (e. g, once per frame) • BS decides the location of feedback • Bs decides • MS sends requested feedback type 1101 to report 3 best band PMI and differential CQIs based on the measurement on mid-amble • Reset CQI values of best bends to prevent error accumulation of differential reporting • Best band changes coding/modulation/repetition based on a MS’s UL CINR • Typically, one subchannel is required to carry one FH subheader, for high SNR users, BS can use high QAM, MS can piggy back traffic data to this feedback channel, for low SNR users, BS could use QPSK, rate ½ and repetition code to improve the feedback channel performance • Same mechanism for CQI, PMI, Rank, Band AMC • Use Feedback-Polling_IE once for the allocation and once for deallocation of the FH, no need to do it every frame • MS decides when to update BAND information changes instead of predetermined by BS, which has no little knowledge

Option 1: Operation example B Feedback_Polling_IEs to de-allocate the feedback Feedback_Polling_IE (type 1101) BS Feedback header type 1101 Feedback_Polling_IE (type 0110) Feedback header for type 0110 MS … … • BS decides the periodicity for both type of feedbacks • Need two separate polling IEs • MS send two feedback on separate feedback channels • MS sends requested feedback header type 0110 to report the location and CQI of best AMC bands • MS sends requested feedback type 1101 to report 3 best band PMI and differential CQIs based on the measurement on midamble • Similar to example A except BS controls the reporting periodicity

Option 2: Operation example Feedback_Polling_IE and CQICH_Enh_Alloc_IEt o de-allocate the feedback CQICH_Enh_Alloc_IE BS Feedback_Polling_IE (type 0110) MS Primary and secondary CQICH Feedback header for type 0110 … … • BS decides the periodicity for both type of feedbacks • MS sends requested feedback header type 0110 to report the location and CQI of best AMC bands • Need two separate IEs • MS send two feedback on separate feedback channels • MS sends 1 PMI and 3 bits differential CQI via primary and secondary CQICH based on the measurement on mid-amble

Option 1 to 2 switching: Operation example A Feedback header for type 1101 Feedback header for type 0110 Primary and secondary CQICH From the reported CQI values BS decides that the MS is in low SNIR region, want to switch to Option 2 and send Feedback_Polling_IE (Type 0110) and CQICH_Enh_Alloc_IE Feedback_Polling_IE to de-allocate the feedback heder type 1101 BS MS … … … • MS starts to send the 1 PMI for 3 bands and diff CQI • MS continued to send requested • When MS receives the polling IE to deallocate the FH type feedback type 1101 to report 3 best band PMI and differential CQIs based on the measurement on mid-amble • It reports the bestband bitmap, 3 best band CQIs and rank 1101, MS starts to send FH type 0110 based on the option 2 calculation of the best bands and rank • Once the MS receives the CQICH_Enh_Alloc_IE it starts to report 1 PMI for 3 best bands and differential CQIs from the next FH type 0110 transmission • MS changes the bestband, PMI and Rank calculation accordingly

Option 1 to 2 switching: Operation example B Feedback header for type 1101 Feedback header for type 0110 Primary and secondary CQICH From the reported CQI values BS decides that the MS is in low SNIR region, want to switch to Option 2 and send CQICH_Enh_Alloc_IE Feedback_Polling_IE to de-allocate the feedback header type 1101 BS MS … … … • After MS receives the CQICH_Enh_Alloc_IE MS sends feedback type 0110 based on the calculation for option 2 • MS continued to send requested feedback type 1101 to report 3 best band PMI and differential CQIs based on the measurement on mid-amble • It reports the bestband bitmap, 3 best band CQIs and rank • Once the MS receives the CQICH_Enh_Alloc_IE it starts to report 1 PMI for 3 best bands and differential CQIs from the next FH type 0110 transmission • MS changes the bestband, PMI and Rank calculation accordingly

Option 2 to 1 switching: Operation example From the reported CQI values BS decides that the MS is in high SNIR region, want to switch to Option 1 and send Feedback_Polling_IE (type 1101) Primary and secondary CQICH_Enh_Alloc_IEt o de-allocate the feedback Feedback header for type 0110 Feedback header for type 1101 BS MS … … • MS starts to send 3 PMI and diff. CQI via FH type 1101 • MS continues to send 1 PMI and diff. CQI • After MS receives the polling IE for FH type 1101 MS start to send the FH header type 0110 based on option 1 calculation • It reports the bestband bitmap, 3 best band CQIs and rank