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SDCCH Handover

  • This topic has 8 replies, 1 voice, and was last updated 18 years ago by Prithwish.
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  • #36890 Reply
    Prithwish
    Guest

    What is the necessity of SDCCH to SDCCH handover, and what is the criterion on which it is effected? As I understand, no measurement reports are sent on the uplink during the phase in which the BTS is communicating with the MS on SDCCH.

    #36891 Reply
    Nguyen
    Guest

    Hi,

    Below is some information extracted from BSS documentation:

    “It is possible that an MS using an SDCCH slot may need to perform an inter- or intra-cell handover. This need is calculated by the HDPC algorithms using uplink and downlink measurement reports in the normal way

    One important item to note is that the interference band allocated to a channel is still the first criterion in the channel allocation algorithms. A channel from the highest priority carrier matching the requested interference band is allocated to a channel request. Moreover, the channel allocation priority is also a secondary criterion after the existing criteria of channel selection in a Multiband, Concentric Cell, and Extended Range Cell environment. Also the channel allocation priority may not be followed for an emergency call if a channel is allocated from the emergency reserved channel pool.

    For interference-based intracell handovers, the channel selection algorithm for a non-hopping cell has been modified to consider the channel allocation priority as follows:

    Compile a list A with any channels in the best interference band.
    From list A, select any channels on a carrier other than the current carrier and compile a list B. If none are available, select the best channel from list A.
    From list B, select a channel with the best available channel allocation priority.
    It should be noted that the previous criterion of preferring BCCH over non-BCCH in step 3 has been replaced by the channel allocation priority”

    Hope this help you to clarify.

    Brgds

    #36892 Reply
    Prithwish
    Guest

    Thanks for the msg. Does it imply that measurement reports, including the interference reports, for SDCCH are also being sent in the uplink to the BTS? Could you please clarify?

    #36893 Reply
    Nguyen
    Guest

    Yes, I think you are true.
    Rgds

    #36894 Reply
    Prithwish
    Guest

    Does that imply that in 04.08, a RIL 3 RR message for SACCH measurement on SACCH associated with SDCCH is sent during the SDCCH phase? Is it true that this handover is MSC controlled?

    Thanks & rgds.

    #36895 Reply
    Nguyen
    Guest

    Plz describe yr question more clearly.

    However this handover is controlled by BSC, not by MSC

    #36896 Reply
    Prithwish
    Guest

    The basic question is if Downlink measurements are carried out on the quality of the SDCCH link, and passed on to the BSC, on the uplink for effecting an SDCCH handover. If so, there should be a RIL3 message defined in 04.08, for passing on the SDCCH quality mesurements on the uplink.

    #36897 Reply
    Nguyen
    Guest

    I think the MS just use the ordinary Measurement Report message on the uplink to pass the SDCCH quality mesurements to the BSS.

    #36898 Reply
    Prithwish
    Guest

    Thanks & regards

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