LTE, How to change the RBG size ?

[Lawrence Chen]

Hi All,

In LTE, I found there is only implement Type 0 Resource Allocation,
and I want to modify the Resource Block Group RBG size,
ex: 110RB, the RBG size is 4, and I want the size can be 3 or 5 or others
how should I do ?

Any help will be appreciated !

Regards,
Lawrence

[Marco Miozzo]

Hi Lawrence,

in type 0 the RBG size is determined according to table 7.1.6.1-1 of TS 36.213. Therefore, by changing the attribute DlBandwidth, you can play with RBG size according to 3GPP specs; for instance:

default ns3::LteEnbNetDevice::DlBandwidth "100"

Regards,

marco.

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[Konstantinos]

Dear Marco,

Are you sure that the default DlBandwidth is 100? (this is from ns-3.16 documentation)

• UlBandwidth: Uplink Transmission Bandwidth Configuration in number of Resource Blocks
  • Set with class: ns3::UintegerValue
  • Underlying type: uint8_t 0:255
  • Initial value: 25
  • Flags: construct write read
• DlBandwidth: Downlink Transmission Bandwidth Configuration in number of Resource Blocks
  • Set with class: ns3::UintegerValue
  • Underlying type: uint8_t 0:255
  • Initial value: 25
  • Flags: construct write read

[Marco Miozzo]

No, it was just an example for generating a configuration file with different DL bandwidth, the standard one is 25.

marco.

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[Lawrence Chen]

Hi Marco,

I know that Type 0 RBG size is determined according to table 7.1.6.1-1,
and I can get different RBG size with different bandwidth,(type 0, RBG size from 1~4)
but I am think about is that the fixed bandwidth(20MHz, 110RB) with RBG size is different (RBG size > 4)?
Is this possible?
Thanks a lot !


Regards,
Lawrence



Marco於 2013年1月23日星期三UTC+8下午4時33分31秒寫道：

[Marco Miozzo]

I'm not sure I got the question, in case you want to modify the standard behavior of the allocation type 0, you should consider where RBG are used in the simulator. From a quick check, it seems to me that RBG are used only in the schedulers and LtePhy (check GetRbgSize method). In principle, by modifying these files you should be able to get the behavior you desire.

Regards,
marco.