max HS Codes available= 14 instead of 15

[shishio]

Hi,
Anyone have any idea about why I can only get max 14 HS Codes, while I am sure I am the only one in the cell, and maxNumHsPdschCodes parameter is also set to correct value 15 ??

dear shahram,

this only means that your signalling has been allocated more than one sf 16 code (up to 2), that's why you only have 14 sf 16 codes even though you are the only one in the cell

[wolverine]

As already mentioned you need to set..

numEhichErgchCodes = 1
numHsScchCodes = 1

..you can see why in the illustration below. Any higher and you start using another SF16.

On a live network I would not recommend the above settings. You just have to accept that only 14 will be available.

Code tree.PNG

[ChristopherAlbertini]

Dear All,

We are facing the same problem with NSN.
Can anyone assist on how to get 15 codes ?

Br
CA

[RFHumam]

Check in the (cell performance monitor ->Cell code tree monitor) where is the 15th code gone as start point

[Nyquist]

Hi.
I other words. You have 16 codes with SF=16 available. If you have voice services, at least one SF16 is blocked for HS. Control Channel also could block another SF16, and also HSUPA. In real networks is quite imposible to get the 15 codes. Just in demo cases in a platform disabling services could get 15. The point is that you would need more frequencies and if possible to activate Dual Carrier in order to get higher speed.
Regards
Nyquist

[rsv12]

Hi,
Possible you will find an answer in this feature functional description :RAN1686: HSPA 72 Users Per Cell - "The code space of HS-SCCH# 2, 3 and 4 code can be dynamically used for the 15thHS-PDSCH, if not needed for HS-SCCH. The HS-SCCH# 2, 3, and 4 are mapped to
the same code tree branch as the last HS-DSCH SF16 code. If this SF16 code
branch is not needed for any other channels, the BTS may use it for HS-DSCH
transmissions, therefore allowing the full use of the DL HSDPA bandwidth".

[Muhammad Imran Rafique]

Hi All,

Activate SRB on HS and FDPCH to lower your code consumption.
Secondly if you set numHsScchCodes & numEhichErgchCodes = 1, then you would easily be able to get 15 code for one HS user in cell.

BR//
Imran

[rnpopt]

Brother, if we activate Activate SRB on HS, then for the mobiles that doesn't support HS what will happened for them? Any idea?

Hi All,

Activate SRB on HS and FDPCH to lower your code consumption.
Secondly if you set numHsScchCodes & numEhichErgchCodes = 1, then you would easily be able to get 15 code for one HS user in cell.

BR//
Imran

[Muhammad Imran Rafique]

Two things are important here

a) Ue don't support, system will treat is as normal and operation will be fine.

b) Now NWs have high % of rel 7 & above Ues, as per 3GPP its mandatory to have SRB on HS & FDPCH so there would be visible gain.

BR//