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Proposals on Update of S-SFH Document Number: C80216m-09_2893 Date Submitted: 2009-12-31 Source: Xianming Chen, Yanfeng Guan, Lei Zhang, Feng Xie, Yang.

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Presentation on theme: "Proposals on Update of S-SFH Document Number: C80216m-09_2893 Date Submitted: 2009-12-31 Source: Xianming Chen, Yanfeng Guan, Lei Zhang, Feng Xie, Yang."— Presentation transcript:

1 Proposals on Update of S-SFH Document Number: C80216m-09_2893 Date Submitted: 2009-12-31 Source: Xianming Chen, Yanfeng Guan, Lei Zhang, Feng Xie, Yang Liu E-mail: guan.yanfeng@zte.com.cn ZTE Corporation Venue: IEEE Session #65, La Jolla, San Diego, CA, USA. Category: P802.16m_D3 comments/Area: Chapter 16.2.23 Update of S-SFH IEs & 16.3.6.5.1.2 S-SFH IE Base Contribution: This is base contribution Purpose: For TGm discussion and adoption of P802.16m_D3 text. 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: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2 Introduction To maintain normal network operations, ABS broadcasts and adjusts its configuration via system information updating. –The critical information is broadcasted via P-SFH/S-SFH IEs in 802.16m. –The critical information includes a minimal set of time critical system configuration information and parameters needed for the AMSs to complete cell selection and system access in a power efficient manner. But, there is no harmonized update method for the system information. This contribution lists some problems to be considered for the system information update and the solutions.

3 Problem 1: –When the system information is changed, it is generally required that AMSs can apply the changed system information as soon as possible, and make the time interval between the system information changing and taking effect short as possible. But, the time interval may be also longer if S-SFH SPx scheduling periodicity is much longer, such as 160ms; furthermore, the correct decoding probability of the long period S-SFH SP will be smaller than that of the short period S-SFH SP. Problem 2: –For making each SP update process simple and independent, the system information in the different SP should have no strong association. But, the resource mapping indication information in SP1 and SP2 has too much association. For example, assuming that initial “DFPSC” value in SP2 is 2, and initial “DCASi” value in SP1 also is 2, and if “DFPSC” value is changed into 1 subsequently, then it’s impossible that “DCASi” value remains unchanged. That means, in this case, the information fields related to resource mapping in SP1 and SP2 need to take effect simultaneously. Problem (1/2)

4 Problem 3: –In sleep mode, P802.16m/D3 has description as follows: During Listening Window, the AMS is expected to receive all DL transmissions same way as in the state of normal operations. AMS shall ensure that it has up-to-date system information for proper operation. If the AMS detects that the information it has is not up-to-date, then it shall not transmit in the Listening Window until it receives the up-to-date system information. –For an AMS in sleep mode, if it doesn't correctly receive the updated system information when it wakes up, the normal operation will be affected. Therefore, a mechanism shall be needed to ensure that an AMS can get up-to-date system information when it wakes up. Problem 4: –If an AMS can’t decode the SFH correctly, there’s no special text to specify the possible operation. Problem (2/2)

5 Solution (1/2) Solution to Problem 1: –During the update process, the update method is the same for each SP. ABS may adjust the SP scheduling periodicity, and it can equal the minimal SP scheduling periodicity supported by ABS. After the updated SP has taken effect, ABS can restore the adjusted SP scheduling periodicity to the original periodicity before the update process. [Refer to Figure 1] –Advantage: This method ensures that an AMS can acquire and apply the up-to-date system information as soon as possible, and the SP with different scheduling periodicity has the same decoding probability for an AMS. Solution to Problem 2: –All indication information for the resource mapping is packed into one SP1 or SP2 (Refer to the C802.16m-09/2894). –Advantage: Make each SP’s transmission period and update process independent.

6 Proposed Solution (2/2) Solution to Problem 3: –In sleep mode, if the S-SFH SP has changed and taken effect during the sleep window, the changed S-SFH SP should be immediately sent in the first or second SFH subframe after the AMS wakes up. [Refer to Figure 2] –Advantage: Guarantee the normal operation after a sleep AMS wakes up. Solution to Problem 4: –If an AMS can’t decode P-SFH correctly or the time of falsely decoding S-SFH is more than N (TBD), the AMS will perform reentry process. –Advantage: Faster the reentry process if an AMS can’t decode SFH correctly.

7 Figure 1 for Solution 1 This figure above gives a case that ABS decreases SP3 scheduling periodicity during SP3 update.

8 Figure 2 for Solution 3 This figure above gives a case that ABS transmits the changed SP3 IE in superframe n+5 additionally.

9 Add the new text in page 285, line 62 in section 16.2.23 During the update process, ABS may adjust the SP scheduling periodicity, and it can equal the minimal SP scheduling periodicity supported by ABS. After the updated SP has taken effect, ABS can restore the adjusted SP scheduling periodicity to the original periodicity before the update process. In sleep mode, if the S-SFH SP has changed and taken effect during the sleep window, the changed S-SFH SP should be immediately sent in the first or second SFH subframe after the AMS wakes up. If an AMS can’t decode P-SFH correctly or the time of falsely decoding S-SFH is more than N (TBD), it will perform reentry process. Proposed Text

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