Discussion of Explicit vs. Implicit PC-A-MAP IE Assignment (15.2.3) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-09/2584 Date Submitted: 2009-11-06 Source: Yi Hsuan, Rongzhen Yang, Hujun Yin Intel Corporation Venue:. IEEE 802.16m: “802.16m/D2 letter ballot” Target topic: P802.16M/D2 - 15.2.3 Purpose: 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 >.

Background In current P802.16M/D2, the text of PC-A-MAP IE assignment for CLPC is not ready; In previous meetings, the implicit assignment methods were proposed (C80216m-09/1054 and C80216m-09/1903): It claims the benefit for signaling overhead saving But it limits the flexibility of PC-A-MAP IE assignment for period, power adjust step and CLPC enable/disable; Here we share our study of 16m CLPC usages, to identify the suitable solution for PC-A-MAP IE assignment.

Evaluation Setting Key Assumption: Evaluation Parameters Setting: CLPC should at least support power tracking at for different speed: Three moving speeds are selected for analysis: 3km/h, 30km/h and 120km/h with 16m e-ITU channel; It is considered as “following” of CLPC when error is less than deltastep/2; (deltastep = 0.5 dB); Evaluation Parameters Setting: Set different periods for CLPC control rate for different moving speeds, to identify the minimum period of each scenarios; Set different CLPC power adjust step (deltastep) for different moving speeds, to identify the best step size of each scenarios;

Moving Speed: 3km/h Example of Power Tracking Absolute Error CDF CLPC Power Control Step Size (0.5dB) of 2 bits: -0.5, 0, +0.5, 1 dB Period of 20 frames with 0.5dB adjust step can effectively tracking channel fading (following probability with 90%)

Moving Speed: 30km/h 2 choices can meet 90% following requirement: Absolute Error CDF of Step Size (0.5dB) of 2 bits: -0.5, 0, +0.5, 1 dB Absolute Error CDF of Step Size (1dB) of 2 bits: -1, 0, +1, 2 dB 2 choices can meet 90% following requirement: Period of 2 frames with 0.5dB adjust step Period of 5 frame with 1dB adjust step

Moving Speed: 120km/h CLPC Power change in every frame is needed Absolute Error CDF of Update Period 1 Frame Absolute Error CDF of Update Period 2 Frame CLPC Power change in every frame is needed Adjust step 1dB (-1, 0, +1, 2) is better than 0.5dB & 2dB

Summary of CLPC Power Tracking Evaluation The CLPC power control rate should be configurable for the different MS. The CLPC power control change step can be configurable for the different MS, 2 options are enough: minimum step = 0.5 or 1 dB. Current implicit assignment cannot support upper 2 requirements.

Supporting of Open Loop and Closed Loop Coupling Coupling of Open Loop and Closed Loop Power Control is defined at SDD 11.10.2.3: Open Loop Power Control coarsely adjust uplink transmit power with low signaling overhead When there is high traffic, Closed loop will be the main power control scheme Explicit vs. Implicit Assignment: Explicit Assignment can implement it easily by a field of Assignment Duration (frames) Currently, there is no implicit assignment method that can support it.

Recommendation PC-A-MAP IE Assignment should be explicit to include at least 3 fields: Control Rate (assignment period) Power Change Step: 1 bit field to indicate 0.5 or 1 dB Assignment Duration: the begin and the end of assignment The proposed text in contribution xxxx and its latest version is recommended.