New AAI-UL-POWER-ADJ Message in 802.16m Systems in IEEE802.16 D4 (16.2.3)
Document Number:
IEEE C802.16m-10/0216
Date Submitted:
2010-03-05
Source:
Yu-Hao Chang, Yih-Shen Chen
MediaTek Inc.
E-mail: yuhao.chang@mediatek.com
Venue:
IEEE Session #66, Orlando, USA.
Re:
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.
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▪
Motivation
▪
Problem Statement
▪
Proposed AAI-UL-POWER-ADJ Message Update
▪
Reference
▪
Text Proposal
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▪
Currently, the power control formula in the 802.16m system can be described as [1]
 
TARGET


,
–
P is the TX power level per stream and per subcarrier for the current transmission
– L is the estimated average DL propagation loss calculated by AMS
– SINR
TARGET is the target uplink SINR received by ABS
– NI is the estimated average power level of the noise and interference per subcarrier at ABS
–
Offset is a correction term for MS-specific power offset and it is controlled by the power control message
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▪
ABS monitors the quality of specific uplink channel by checking the information in the fast feedback channel
(FFBCH) of certain user
– FFBCH periodicity determines how frequently ABS tracks the channel change
– FFBCH periodicity is decided by feedback allocation A-MAP-IE
(FA-A-MAP-IE)
▪
Power offset is used to track the channel variation if ABS feels there is a need to do that
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▪
There are two schemes used to deliver the power offset value to MS
– Via power control (PC) A-MAP-IE
• Power control commands for several AMS could be aggregated and delivered via PC-A-MAP-IE and AMS should be able to identify the address of its power control command inside PC-A-MAP-IE
•
• PC-A-MAP-IE provides a small scale power adjustment
The periodicity of PC-A-MAP-IE is the same as that of the feedback channel, which is decided by FA-A-MAP-IE
– Via power control adjustment message (AAI-UL-POWER-ADJ)
• It provides a large power jump to quickly adopt to the environment change
• It is one of the MAC control messages signaled by the downlink (DL) basic A-A-MAP-IE to a specific user
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▪
When ABS observes a huge power gap in the uplink, it may like to do the following two things
– Send a AAI-UL-POWER-ADJ message to MS
– Monitor closely to the channel variation
• Additional feedback allocation A-MAP IE is necessary
▪
It would be great to combine these two messages to save some signal overhead without requiring extra resource
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▪
The content of AAI-UL-POWER-ADJ includes
– AAI-UL-POWER-ADJ ::=
SEQUENCE{
•
• OFFSET_DATA
INTEGER (0,…,63),
OFFSET_CONTROLINTEGER
INTEGER (0,…,63)
}
▪
The total number of information bits inside AAI-UL-
POWER-ADJ is 20 bits, including a 8-bit message type, which is not shown, and we need to append additional 16-bit
CRC for integrity check
▪
As a result, the overall payload size is 36-bit in total.
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▪
The minimum size of information bits indicated by DL basic
A-A-MAP-IE is 72 bits, which corresponds to idx equal to 3
– i.e., idx = I
MinimalSize
+I
SizeOffset
=1+2
▪
Note that we need one additional bit to signal the presence of
FA-A-MAP-IE information in AAI-UL-POWER-ADJ
▪
Therefore, there are 35 information bits remained
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▪
The number of information bits in FA-A-MAP-IE without CRC is limited by 40-bit.
▪
Some of the IEs in FA-A-MAP-IE are redundant and can be removed when both FA-A-MAP-IE and AAI-UL-POWER-ADJ are combined
– For example:
•
A-MAP-IE Type (4-bit)
• ACK Allocation Flag (1-bit)
• HARQ Feedback Allocation (HFA) (6-bit)
▪ Therefore, the size of remaining elements in FA-A-MAP-IE excluding A-
MAP-IE Type, ACK Allocation Flag and HFA is upper bounded by 29bit.
▪ It is possible to combine these two messages without extra resource
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▪
The updated content of AAI-UL-POWER-ADJ includes
– ---ASN.1START
•
•
•
•
•
AAI-UL-POWER-ADJ ::= SEQUENCE{
•
•
•
OFFSET_DATA
INTEGER (0,…,63),
OFFSET_CONTROLINTEGER
INTEGER (0,…,63), feedbackPeriodicityControlFlag
• channelIndex shortTermFeedbackPeriod longTermFeedbackPeriod
INTEGER (0,1)
INTEGER (0,…,63) OPTIONAL,
INTEGER (0,…,7)
OPTIONAL,
INTEGER (0,…,3)
OPTIONAL, frameOffsetNumber INTEGER (0,…,3) OPTIONAL, subframeIndex
INTEGER (0,…,7)
OPTIONAL, allocationDuration
INTEGER (0,…,7)
OPTIONAL
}
---ASN.1STOP
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▪ feedbackPeriodicityControlFlag: Indicates if additional FFBCH periodicity control parameters exist in AAI_UL_POWER_ADJ
▪ channelIndex: Uniquely identifies a fast feedback channel on which an AMS can transmit fast feedback information. With this allocation, a one-to-one relationship is established between channel index and the AMS
▪ shortTermFeedbackPeriod: Short-term feedback is transmitted on the FBCH every 2 p frames, where p is the value specified by shortTermFeedbackPeriod
▪ longTermFeedbackPeriod: Long-term feedback is transmitted on the FBCH every 2 q short-term feedback reports are transmitted, where q is the value specified by longTermFeedbackPeriod.
If q = 0b00 , long-term feedback is not used
▪ frameOffsetNumber: The AMS starts reporting at the frame of which the number has the same
3 LBS as the specified frame number. If the current frame is specified, the AMS starts reporting in eight frames
▪ subframeIndex: Indicates the UL AAI subframe index in the UL portion of the frame
▪ allocationDuration: An FBCH is transmitted on the FBCH channels indexed by Channel Index for 8
×
2 d frames, where d is the value given by allocationDuration. If d = 0b000 , the FBCH is deallocated. If d = 0b111 , the AM reports until the ABS command for the AMS to stop

▪
In this contribution, we suggest to combine both
AAI_UL_POWER_ADJ message and FA-A-MAP-IE as a new AAI_UL_POWER_ADJ message so that AMS can adjust not only the transmit power but also the feedback periodicity of AMS at the same time without additional resource
▪
Since not all the control parameters from FA-A-MAP-IE are included in the new AAI_UL_POWER_ADJ message, only feedback periodicity and duration are updated while the other feedback mechanisms, such as MIMO mode, are kept the same as specified in the latest FA-A-MAP-IE

▪ [1] IEEE P802.16m/D4, “DRAFT Amendment to IEEE
Standard for Local and metropolitan area networks, Part 16:
Air Interface for Fixed and Mobile Broadband Wireless
Access Systems”, Jan. 2010
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▪
▪
Modify the following text in line 60 of page 118 of P802.16m/D4 as
---ASN.1START
AAI-UL-POWER-ADJ ::= SEQUENCE{
OFFSET_DATA
OFFSET_CONTRILINTEGER
INTEGER (0,…,63),
INTEGER (0,…,63), feedbackPeriodicityControlFlag channelIndex shortTermFeedbackPeriod
INTEGER (0,1)
INTEGER (0,…,63) OPTIONAL,
INTEGER (0,…,7)
OPTIONAL,
INTEGER (0,…,3)
OPTIONAL, longTermFeedbackPeriod frameOffsetNumber INTEGER (0,…,3) OPTIONAL, subframeIndex allocationDuration
INTEGER (0,…,7)
OPTIONAL,
INTEGER (0,…,7)
OPTIONAL,
}
---ASN.1STOP
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