Text Proposal of PC-A-MAP IE Assignment in IEEE802.16 D3 (16.3.6.5.2.3)

IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number:

IEEE C802.16m-09/2859r1Date Submitted:

2009-12-30Source:

Jeongho Park, Hokyu Choi Voice: +82-31-279-7528 E-mail: jeongho.jh.park@samsung.com

Samsung Electronics Co., Ltd. 416 Maetan-3, Suwon, 443-770, Korea

Re:IEEE 802.16-09/0057, “IEEE 802.16 Working Group Letter Ballot Recirc #30a: Announcement”

Base Contribution:None

Purpose:Discussion and Approval

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/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>.Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.

UL Transmit Power Control (TPC)

• Current AWD defines PC-A-MAP IE– This IE is TPC command for TX power correction

– PC-A-MAP IE has 2 bit-field• -0.5dB, 0dB, 0.5dB, 1.0dB

– AMS should interpret this IE as relative value to current tone power

Closed Loop Power Control

• In FDD Systems– Active AMS should keep track of short term channel at

least • For Control Channels

– Guarantee of Target SINR is important

– Guarantee of Target PER is important

– Periodic Tx power update by using PC-A-MAP would prevent abrupt huge Tx power change

How to Assign PC-A-MAP?

• Explicit Way– FBCH Alloc IE can include a field which indicates the PC-A-MAP

location to a MS

– The field size is dependent on total number of channels per subframes overhead increase

• Implicit Way– By coupling with assignment of UL reference signal, additional

explicit assignment might not be necessary

– One good reference is FBCH allocation

No overhead increase

• Suggestion is “Implicit Assignment of PC-A-MAP”

Implicit Assignment

• FBCH is assigned to AMS in mandatory

• We can exploit FBCH allocation order for PC-A-MAP allocation– BS can estimate UL SINR based on FBCH

– PC-A-MAP field is set based on estimated UL SINR

• PC-A-MAP location can be coupled with FBCH allocation

Answers to Concerns on Implicit Way

• Period of PC-A-MAP– Same period with FBCH period is not inappropriate?

– The more frequent PC-A-MAP than FBCH would be meaningless if there is no UL reference signal for UL SINR estimation

• Therefore, same period with FBCH is what PC-A-MAP can have at most if there is not any other UL reference signal

– The less frequent PC-A-MAP than FBCH would result in lack of information for power control on FBCH transmission

• Overhead PC-A-MAP IE of the proposal– This proposal request all MSs who transmits FBCH to be assigned PC-A-MAP

– Considering 320 users per sector and FDD frame with 8 subframes, 40 users per subframe need to be assigned PC-A-MAP

– This results in total 160 tones per subframe ( 4 tones x 4 users ) which would occupy less than 1.5 LRU

Assignment Rule Example (FDD)

• ABS assigns FBCH to AMS#1 in UL subframe#3 with 5ms – Then, PC-A-MAP is automatically assigned in DL #7

– Exact location in DL#7 is determined by the order of AMS#1’s FBCH in UL subframe#3

DLSub-frame

#0

DLSub-frame

#1

DLSub-frame

#2

DLSub-frame

#3

DLSub-frame

#4

DLSub-frame

#5

DLSub-frame

#6

DLSub-frame

#7

i- th frame

ULSub-frame

#0

ULSub-frame

#1

ULSub-frame

#2

ULSub-frame

#3

ULSub-frame

#4

ULSub-frame

#5

ULSub-frame

#6

ULSub-frame

#7

DLSub-frame

#0

DLSub-frame

#1

DLSub-frame

#2

DLSub-frame

#3

DLSub-frame

#4

DLSub-frame

#5

DLSub-frame

#6

DLSub-frame

#7

(i+1)th frame

ULSub-frame

#0

ULSub-frame

#1

ULSub-frame

#2

ULSub-frame

#3

ULSub-frame

#4

ULSub-frame

#5

ULSub-frame

#6

ULSub-frame

#7

FF

BC

H #

1

PC

-A-M

AP

IE

#1

FF

BC

H #

2

PC

-A-M

AP

IE

#2

FF

BC

H #

1

FF

BC

H #

2

Duration2Duration1

Assignment Rule Example (H-FDD)• In H-FDD systems, certain subframes can have limited transmission

due to reception of SFH– Subframe #0, #1 and #7 are not used for UL transmission– Subframe #3, #4 and #5 are not used for DL transmission accordingly– Only Subframe #2 and #6 are used for both DL and UL transmission

Assignment Rule Example (TDD)• In TDD Systems,

– Total number of UL FFBCH per ‘frame’ should be same to total number of UL PC-A-MAP IE per ‘frame’

– In example, period of FFBCH 1 frame and 2 frame for MS#1 and MS#2 respectively

Range of PC-A-MAP IE • Number of LRU for FBCH in SP3 : 4bits (0~15LRUs)

– FBCH = H-FBCH + F-FBCH

• Number of LRU for H-FBCH in SP1 : 2bits – Pre-determined number according to Bandwidth

• Number of Channels for F-FBCH

# of CH # of LRU # of CH # of LRU # of CH # of LRU5MHz 　 10MHz 　 20MH 　

6 1 6 1 12 212 2 12 2 24 418 3 24 4 48 824 4 30 5 60 10

Number of channels for FFBCH# of H-FBCH 5MHz 　 　 　 　 　 　 　 　 　 　 　 　 　 　0b00 0 3 6 9 12 15 18 21 24 27 30 33 36 39 420b01 -3 0 3 6 9 12 15 18 21 24 27 30 33 36 390b10 -6 -3 0 3 6 9 12 15 18 21 24 27 30 33 360b11 -9 -6 -3 0 3 6 9 12 15 18 21 24 27 30 33

# of H-FBCH10MHz 　 　 　 　 　 　 　 　 　 　 　 　 　 　

0b00 0 3 6 9 12 15 18 21 24 27 30 33 36 39 420b01 -3 0 3 6 9 12 15 18 21 24 27 30 33 36 390b10 -9 -6 -3 0 3 6 9 12 15 18 21 24 27 30 330b11 -12 -9 -6 -3 0 3 6 9 12 15 18 21 24 27 30

# of H-FBCH20MHz 　 　 　 　 　 　 　 　 　 　 　 　 　 　

0b00 -3 0 3 6 9 12 15 18 21 24 27 30 33 36 390b01 -9 -6 -3 0 3 6 9 12 15 18 21 24 27 30 330b10 -21 -18 -15 -12 -9 -6 -3 0 3 6 9 12 15 18 210b11 -27 -24 -21 -18 -15 -12 -9 -6 -3 0 3 6 9 12 15

Proposed Text : Remedy #1• Insert the following text and Table XX in page 394, line 56 of

IEEEP802.16m/D3 (under the Table 810- PC-A-MAP IE format)

For FDD/H-FDD systems, when FBCH is assigned to AMS, the corresponding PC-A-MAP IE to the AMS automatically follows the assignment location defined in Table XX. In the table, P is allocation period of FBCH by Feedback Allocation A-MAP IE (refer to Table 818-Feedback Allocation A-MAP IE) in terms of subframe. And N is the available number of subframes in a frame.

Table XX- PC-A-MAP IE Location in FDD/H-FDD systems

Frame index Subframe index Channel/IE index

FBCH Location i m q

PC-A-MAP IE Location i + floor[ (m+P/2)/N ] (floor(m+P/2)) mod N q

Proposed Text : Remedy #1 (Cont’d)

For TDD systems, when FFBCH is assigned to AMS, the corresponding PC-A-MAP IE to the AMS automatically follows the assignment location defined in Table YY. In the table, s is defined as s = Q * m +q where N : total number of subframes in a frame (N=D+U) D : total number of downlink subframes in a frame U : total number of uplink subframes in a frame Q : total number of FFBCH in a uplink subframe given by Q = Nfb*UL_FEEDBACK_SIZE –

LHFB/6 where Nfb is 3 in Mzone and 4 in Lzone with PUSC, and LHFB is the number of UL HARQ channels defined in S-SFH SP1

q : the index for assigned location of CQI channel for a MS (0≤q≤Q-1) m : UL subframe index (0≤m≤U-1) T : total number of PC-A-MAP IE in downlink subframe, T = ceil(U*Q/D)

Table YY- PC-A-MAP IE Location in TDD systems

Frame index Subframe index Channel/IE index

FBCH Location i m q

PC-A-MAP IE Location i + 1 (floor(s/T)) mod N s mod T

Proposed Text : Remedy #2• Change the line 26~27 in page 377 (table 801) as

Power control channel resource size indicator 2 0b00 : No Use of PC-A-MAP IE for UL power correctionTotal number of PC-A-MAP IE, NPC-A-

MAP-IE is 0b01 : 140b10 : 280b11 : 42

Proposed Text : Remedy #3• Change the line 24~61 in page 373 as

16.3.6.3.2.3 Power Control A-MAPPower Control A-MAP (PC-A-MAP) contains PC-A-MAP-IEs for closed-loop power control power correction of the

uplink transmission. The ABS shall transmit PC-A-MAP-IE to every AMS which operates in closed-loop power control mode transmitted FFBCH. The location of PC-A-MAP-IE is specified in Table XX and Table YY.

Figure 513 shows the construction procedure of PC-A-MAP symbols from PC-A-MAP-IE.

The ith PC-A-MAP-IE shall have the size of 2 bits according to power correction value.

The ith and (i+1)th PC-A-MAP IEs shall be mapped to two QPSK symbols as depicted in Figure 513. Only the i th PC-A-MAP may also be mapped to two QPSK symbols for transmitting to the corresponding MS with poor channel quality.

Power scaling by sqrt(Pi) (0i NPC-A-MAP-IE)shall be applied to the ith PC-A-MAP-IE where NPC-A-MAP-IE is the number of PC-A-MAP-IEs and sqrt(Pi) is the value determined by the management entity to satisfy the link performance.

The QPSK symbols are repeated Nrep,PC-A-MAP-IE times, where Nrep,PC-A-MAP-IE equals two if A-A-MAP MCS selection field in SFH SP1 is 0b0, and four if A-A-MAP MCS selection field is 0b1.

(x2)

(x2)

(x Nrep,PC-A-MAP-IE)

(x Nrep,PC-A-MAP-IE)

Proposed Text : Remedy #3 (cont’d)• Change from line 63 in page 373 to line 2 in page 374 as

Figure 513 shows a cluster of PC-A-MAP channels, which consists of 2 PC-A-MAP channels numbered as 2c and 2c+1 where c is the PC-A-MAP cluster index in the A-MAP region. Channel 2c in the cluster occu-

pies the real part of both symbols in each tone pair before the SFBC encoder. Channel 2c+1 occupies the imaginary part of both symbols in each tone pair before the SFBC encoder.