1. Grouping broadcasting Information into deployment wide and sector specific
Document Number:
IEEE C80216m-08/828
Date Submitted:
Source:
Xiaoyi Wang,
Shashikant Maheshwari
Yousuf Saifullah
Nokia Siemens Networks
Andrea Bacioccola
Zexian Li
Nokia
Heping Li Dongjie, No.11
Beijing, China
Venue:
IEEE m-08/024: Reply to SDD comments.
Base Contribution:
N/A
Purpose:
Discussion and approval by TGm for the m SDD
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2. Possible deployment wide common messages
For deployment wide messages, since the information are common among neighboring BSs, we can use frequency reuse=1 for transmisssion. Besides higher spectrum efficiency, cell edge user obtains diversity on PBCH reception.
Here is a list of possible deployment wide common messages.
CP length bits
DL/UL bits
TTG bits
RTG bits
OperatorID bits
Switching point number 2 bits
System Bandwidth bits
Super frame number 12/24 bits
Mac Version bits
paging Group bits
Cell Type bits
Nsp ID bits or even more
Burst Profile bits
UL frequency(FDD only) 8 bits
UL/DL PHY mode bits (including FFT size, etc.)
Totally : bits or more.
These messages are normally common in deployment wide areas.
If we don't group them out, and transmit in PBCH, then we have to use FR=3 for transmission at each sector.
So the resource consumption is: 134*3*4/88=~18 RB. (one RB is consist of 88 tones for data, QPSK1/2, 4 repetitaion, FR=3)
If we group those common message and transmit at PBCH, then the resource consumption is: 134*4/88=~6 RBs
Considering in 5Mhz, we only have 24 RBs altogether, such gain is remarkable.

3. Grouping Broadcast Information into deployment wide common and sector specific messages

4. Pros and conclusion
Cell edge MS could combine the signal from multiple BSs to decode the deployment wide common information (macro diversity)
Less frequency resources are used for deployment wide common information. (FR=1 rather than 3)
To conclude, grouping the broadcasting information brings obvious gain, and should be adopted by SDD.