1. 1 Scalable Ranging Codes for Femtocell Document Number: IEEE C802.16m-08/1324r1 Date Submitted: 2008-11-05 Source: Yung-Ting Lee, Hua-Chiang Yin E-mail : yungting.lee@coiler.com.tw Coiler Shiann-Tsong Sheu, Chih-Cheng Yang National Central University (NCU) Whai-En Chen National Ilan University (NIU) Kanchei (Ken) Loa,Yi-Hsueh Tsai, Chun-Yen Hsu,Youn-Tai Lee Institute for Information Industry (III) Venue: IEEE 802.16m-08/040-Call for Comments and Contributions on Project 802.16m System Description Document (SDD), on the topic of TGm SDD Femtocells Base Contribution: IEEE 802.16m-08/003r5 Purpose: For discussion and approval by IEEE 802.16m Working Group 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. Ranging Codes for 16e System The binary ranging codes are subsequences of pseudonoise sequence at the output of PRBS generator –The length of each ranging code is 144 bits –The number of available codes is 256 The ranging allocation is subdivided into slots of 6 subchannels by 3 OFDMA symbols Ranging codes are grouped into 4 code sets –Initial Ranging code set –Bandwidth Request code set –Periodic Ranging code set –Handover Ranging code set

3. Ranging Codes for Femtocell Due to the number of MSs in femtocell is ten or less (  10) and the coverage area is of tens meters, the scale of resources for ranging in femtocell should be different from macrocell. In a 16m femtocell, –the ranging code length should be shorter than 16e system –the number of available ranging codes in femtocell should be less than 16e system –the UL resource unit for ranging should be smaller than 16e system

4. Ranging Codes Generation The ranging code generator for femtocell may be the same as the PRBS generator used in macrocell under a certain interference level

5. Ranging Parameter Set Broadcasting The 16m BS shall periodically broadcast the following information on SBCH, –the index of used ranging code generator –the ranging code length –the number of available ranging codes –the ranging code sets –the UL resource unit and structure for ranging

6. Proposed Text [Add the following section 17.x “Ranging Parameter Set”] 17.x Ranging Parameter Set In order to optimize the resource used for ranging in femtocell, ranging parameter set composed of the index of ranging code generator, the ranging code length, the number of available ranging codes, the ranging code sets and the resource unit and structure for ranging should be adjusted and broadcasted by femto BS periodically.