Synchronous Ranging Structure (AWD-15.3.9.1.4.2) Document Number: IEEE C80216m-09/1493r1 Date Submitted: 2009-07-06 Source: Yih-Shen Chen, Pei-Kai Liao and Paul Cheng E-mail: [email protected], [email protected]MediaTek Inc. Yan-Xiu Zheng E-mail: [email protected]ITRI Venue: IEEE Session #62, San Francisco, USA Response to IEEE 802.16m-09/0028r1, “Call for Comments and Contributions on Project 802.16 Amendment Content” Category: AWD comments / Area: Chapter 15.3.9 (UL-CTRL) “Comments on AWD 15.3.9.1.4.2 Ranging channel for synchronized AMSs” Base Contribution: This is base contribution Purpose: For TGm members’ 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.
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Response to IEEE 802.16m-09/0028r1, “Call for Comments and Contributions on Project 802.16 Amendment Content” Category: AWD comments / Area: Chapter 15.3.9 (UL-CTRL) “Comments on AWD 15.3.9.1.4.2 Ranging channel for synchronized AMSs”
Base Contribution: This is base contribution
Purpose: For TGm members’ 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 synchronization: Time/power/frequency adjustment» Contention-based access request for network entry
– Due to limited coverage, UL synchronization can be skipped after DL synchronization is done
• Periodic ranging (PR)
3
Proposed Structure for Synchronized Ranging Structure (1/3)
• Basic structure: 1-subband x 1 OFDMA symbol– Time-domain repetition can be applied for larger
coverage• 2 or 3• There are three PR opportunities in one subframe if 2
repetitions are applied• There are two PR opportunities in one subframe if 3
repetitions are applied for larger coverage
4
Proposed Structure for Synchronized Ranging Structure (2/3)
• In macrocell, three ranging opportunities are allocated in a subframe if repetition number is 2
• Allocation of “1-subband x 1-subframe” every M superframes in a 10 MHz BW– No entry delay constraint in PR
• For a smaller macrocell,
time-domain repetition won’t
be necessary and the rest of
subcarriers can be formed as
data resource blocks, just like
that in a femtocell
. . .
. . .
. . .
72 subcarriers
5
Proposed Structure for Synchronized Ranging Structure (3/3)
• In femtocell, synchronized ranging channel is TDM with data channel– The ranging channel occupies 72 subcarriers x 1 OFDM symbol– The rest of subcarriers can be formed as five-symbol CRUs
• The allocation of synchronous IR channel appears every N superframes
– N must meet the idle-> active delay requirement (i.e., 100ms)
• Advantages:– Enough time accuracy– No extra entry delay– Higher spectral efficiency
• Disadvantage:– There exists two kinds of data PRUs in one subframe