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Directed Retry Paramters

Viewing 15 posts - 1 through 15 (of 36 total)
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  • #58109 Reply
    Arpan
    Guest

    Hi All
    what are the radio parameters that needs to be set while enabling “directed retry”?

    Also, can anybody explain the same specifically for ZTE System.

    Regards
    Arpan

    #58110 Reply
    Abdel
    Guest

    co-incidence, i was just right now configuring directed retry on a ZTE BSS to relieve the congestion. What version of ZTE BSS are you using? If the version is 2.95 or later then you can activate it through the radio resource management interface. Right click the cell parameters and go to Service Process Additional Params and check the parameter drind(directed retry indication). From the performance i can see that it is working although SDCCH handover is disabled.

    #58111 Reply
    Arpan
    Guest

    for directed retry there is no need to enable SDCCH handover cuz SCCH HANDOVER IS from SDCCH To another SDCCH while directed retry is SDCCH to TCH.

    #58112 Reply
    Abdel
    Guest

    Yes ur right i forgot sdcch HO is sdcch to sdcch while dr is sddch to tch.

    #58113 Reply
    Arpan
    Guest

    Hi Abdel..

    We are using 2.95 (V2) and iBSC version. “Enable Directed retry Indication” parameter is jst for enabling/disabling. Is there any other parameters to defining thresholds or criteria to decide when/where to handover????

    Regards
    Arpan

    #58114 Reply
    Abdel
    Guest

    Hi Arpan ,
    wow the IBSC is the one that has the IP interface you can connect ur BTS trhough the internet, it is one of the latest ZTE BSCs, well I am using the 2.95 Version but the hardeware is the old BSC V2 with has TIC cards as the E1 interface I assume the OMM interface is the same, I activated the DR and added the DR indices in my performance to see how well it is working and so for it is so succesful it is working on all the sites with a congestion. I just put the tick over the checkbox on all my sites nothing else.

    #58115 Reply
    Abdel
    Guest

    Dear Arpan

    Als the queueing feature enables the subscribers to put in a queue for a few miliseconds until a TCH is available it is also used to relief congestion. Do you use this feature too? do u know whether this feature is recommended or, the default value in ZTE is no , i was wondering the effect of this feature it will ofcourse increase the setup time but the good thing is it reduce the congestion ratio.

    #58116 Reply
    Fresh Opt
    Guest

    Hi,
    What is difference between Directed Retry and Forced Directed Retry in Alcatel.
    Thanks, waiting for your reply.

    #58117 Reply
    Abdel
    Guest

    In ZTE BSC I didn’t see the forced directed retry, so i think this feature is not available in zte bsc, but we have forced Handover.
    I know Directed retry can be either from MS to BSC(MOC)or BSC to MS(MTC), but what about Queueing is it MOC, MTC OR BOTH??
    anybody knows how the queueing works, i read is it a good parameter for congestion relieft but i can not find additional details.

    #58118 Reply
    Pan
    Guest

    Dear, Abdel! the Queuing works for MOC and for MTC both and for handover also. MSC indicates in Assighnment Request (TCH assighnment) to BSC that queueing is allowed. When there is no idle TCH on radiointerface then Ass Request shall be put in a queue and BSC shall send the Queuing Indication message to MSC and start timer. After succesful TCH allocation within period defined by timer, Assighnment Complete is transfered from BSC to MSC. If implementation dependent queuing timer expires then BSC sends Clear Request to MSC and removes Assignment Request from queue.
    B.R.

    #58119 Reply
    Abdel
    Guest

    Dear Pan ,

    I thought Queueing is activated on cell level not on MSC, may be we are talking about two different types of queueing the one u mentioned looks like a queueing that is activated on the MSC side since you said the MSC indicates to the BSC that queueing is allowed.

    #58120 Reply
    Pix
    Guest

    Pan is right, again (booo-o-ooring)

    MSC allows the queuing of a TCH request
    the BSC will actually DO it.

    2 activation parameters:
    MSC parameter to allow TCH queue
    BSC parameter to perform TCH queue

    if MSC doesn’t authorize the TCH queue, then you might have a BSC parameter called “Queue Anyway”, which will trick the MSC : the TCH queue is performed anyway, but without informing the MSC 🙂 The time of queuing should be shorter than the time that the MSC is waiting for the response from BSC 🙂
    TCH queue contains 2 main parameters:
    – T11 (queue duration)
    – BTS Q LENGTH (number of tch requests that can be queued for one cell)

    Finally, you’re right about DR :
    there are thresholds about rxlev and capacity in the neirhbour.

    DR must be enabled in ALL the cells, along with FORCED DR. They are mandatory mechanism to share the load among cells (IMO).

    #58121 Reply
    Pan
    Guest

    Dear, Abdel! I was the same man who pushed queue button in our MSC when queuing feature was introducing in our network:)

    #58122 Reply
    Abdel
    Guest

    Pan, I trust u that u did, well I am working currently on a zte msc and i checked inside out and this feature is not available so i am gonna test the queueing without msc activation and see how it works, so how about ur network did u activate the queueing at the congested cells only or to all the cells, cuz these this feature will do its work when there are no TCHs available , i see it beneficial to active on all cells.
    I tried to search some info at the internet on queuing so most of them ended up in the IEEE digital library they claim they have 2 million technical articals but it requires a username which can only be logged in by IEEE memberships, they say it costs 140 bucks per year to join them. so i am interested to join it what do u think pan? and then get access to this nice gsm and UMTS articlels? from the abstract the really looked good but may be some of these articals are too technical i am not sure.

    #58123 Reply
    Pix
    Guest

    Abdel,

    I have access to IEEE, and it’s really good. It’s a lot of field experiments and thesis about a lot of stuff. If you see one/two articles that interest you, let me know, i can send it to you.

Viewing 15 posts - 1 through 15 (of 36 total)
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