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:
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1
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
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
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
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
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.