BCH Resource Allocation for IEEE 802.16m
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE C802.16m-09/0167r1
Date Submitted:
2009-01-05
Source:
Jinsoo Choi, Sungho Moon, Jinsam Kwak
email: {emptylie, msungho, samji}@lge.com
LG Electronics
Venue:
Re: IEEE 802.16m-08/052, “Call for Comments on Project 802.16m System Description Document (SDD)”
Target topic: “11.7.2.2 Broadcast Channel (BCH)”
Purpose:
This contribution proposes SDD text for BCH based on IEEE 802.16m-08/003r6.
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
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Resource Allocation in BCH
 Considerations
1 subframe
1 superfame
SFH
SFH
PBCH
PBCH
Logical Index (5 MHz)
SBCH
Indication for following
subframes
SBCH
Data
 PBCH
Data
Indication for
S-BCH (or data)
 Existing uncertainty of the system
BW in initial access stage
 Even if SCH let the MS the system
bandwidth, it's not fully guaranteed
information and so, the MS should
try to perform blind decoding for all
the bandwidth cases to find nonpredefined BCH.
 Subframe with SFH should have
predefined frequency partition.
 Fixed size with being located in
the predefined PRUs (or subbands)
Data
Data
 SBCH
 Variable size which is indicated by
PBCH. PBCH indicates RA
information for SBCH (or data)
within a subframe including SFH.
 SBCH indicates RA information for
the following subframes
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Designs of P- and S-BCH
 Predetermined size and location for PBCH
 The size of PBCH should be predefined. [Note : It will be fixed after deciding
PBCH contents.]
 The PRU location of PBCH should be predetermined
 The PRU location of PBCH should be within the minimum bandwidth
(5MHz) irrespective of the total system bandwidth.
 Variable size and location for SBCH
 The size of SBCH can be variable.
 The location of SBCH is within the minimum bandwidth (5MHz)
 Supporting for MSs with 5MHz system BW
 Enhancing BCH performance/coverage through SCH channel estimation aid
3
Subcarrier to Resource Mapping Rule
 Assumptions
 The fixed size of PBCH
 Predetermined location of PBCH
 PBCH indicate size of SBCH within limited 5MHz BW
Physical Domain
The total banwidth of 10MHz
Logical Domain
The minimum bandwidth of 5MHz
Apply the same permutation rule in DL
PHY structure with 5MHz BW
PBCH: Fixed size
SBCH: Variable size
indicated by PBCH
For data, apply the same permutation rule
in DL PHY structure
Only Data resources
Data: Variable size
One frequency partition
Frequency partitions depending on system BW
4
Subcarrier to Resource Mapping Rule (cont’d)
 There are two permutation process in subframe including SFH
 Permutation related to BCH BW




The PRUs within physically contiguous 5MHz BW are selected for resource
allocation of the PBCH and SBCH (or data).
The sub-band partitioning process is omitted in this process.
The selected PRUs are permuted based on the mini-band granularity. The
permutation rule is defined in the DL PHY section 11.5.x. There is only miniband based permutation.
Finally, the subcarrier permutation (tone-pair wise) can be applied.
 Permutation related to the remaining system BW

For the remaining system BW in the subframe with SFH, the same
permutation rule defined in DL PHY section 11.5.x is applied, excluding the
predefined 5MHz BW.
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Summary
 The subframe with SFH should have predefined frequency region.
 Considering MSs in initial access stage, the PRU location of PBCH
should be within the minimum bandwidth (5MHz) irrespective of
the total system bandwidth.
 The location of SBCH is also within the minimum bandwidth
(5MHz).
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Text Proposal for IEEE 802.16m SDD
============= Start of text proposal for C80216m-08/003r6================
Modify sentences after line 20 of page 92 in 11.7.2.2.5 as following
11.7.2.2.5 Resource allocation
The PBCH and SBCH are transmitted in a predefined frequency partition. and PRUs of the
frequency partition used for PBCH and SBCH transmission span are selected the available
bandwidth for BCH within 5MHz bandwidth.
…
================== End of text proposal =============================
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