View
60
Download
14
Category
Preview:
DESCRIPTION
Nokia LTE Initial Parameter Planning
Citation preview
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 1
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 5
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 6
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 7
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 8
Additional preamble sequences:
in case the 64 preambles cannot be generated from a single root Zadoff-Chu sequence, then remaining preambles are obtained from the root sequences with the consecutive logical indexes until all the 64 sequences are found.
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 9
• zero correlation zone existence in Zadoff-Chu sequence provides the possibility to decode signals on PRACH even if sent on the same shared resources: on the same frequency and in the same time.
• preamble signals generated based on two different ZC sequences are not correlated within the geographical range related to prachCS (i.e. Cyclic Shift configuration index)
• the size of the cyclic shift, must be larger than the maximum round-trip delay, so prachcs is dependant on the cell radius
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 10
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 11
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 12
Note: By configuring the PRACH Configuration Indexes at cells belonging to the same site we use the same subframes for PRACH transmission
Neighbouring eNodeBs are not synchronised so even if the same PRACH configuration indices, there is no guarantee that the PRACH will clash in the time domain. It is possible to set different frequency offsets so PRACH doesn’t clash in frequency domain.
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 13
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 14
PrachCS also depends on the high speed flag.
Currently the common practice is to assume the same cell ranges for all cells: If all cells are considered to have the same size, the utilization of root sequences will not be optimal as we will end up using more root sequences per cell than the needed for certain cell range.
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 15
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 16
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 17
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 18
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 19
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 20
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 21
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 22
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 23
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 24
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 25
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 26
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 27
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 28
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 29
Mod3 (PCI):
1.Mod 3 of the PCI is equal to the Physical Layer Cell Identity so if different then PSS signals are different which facilitates the cell search and synch procedure.
2. RS, carrying one of the 504 PCI has a frequency shift given by mod6(PCI) so collisions between RS are avoided up to 6 adjacent cells ( if 1Tx antenna). For 2Tx ant, # RS is doubled so to avoid collisions in adjacent cells: mod3(PCI) should be different.
Try to stick to (1) up to (4) If (i) is fulfilled then also (i+1) is fulfilled [for i = 2,3,4] If (i) is not fulfilled then also (i-1) is not fulfilled [for i=3,4] The lower the number the higher the priority, this means (1) has the highest priority If (4) is not fulfilled, delta_ss (grpAssigPUSCH) can be used to fix it.
With 2Tx configuration the cells of the same site should have different PCImod3, with 1Tx the PCImod6 should be different. This is to have frequency shift for RS of different cells, because cells of a given site are frame-synchronized in the sense that DL radio frame transmission starts at the same time instant in all the cells --> hence also RS symbols are transmitted at the same time instant. To avoid RS of different cells (of the same site) interfering in the DL, a frequency shift is applied.
The situation changes slightly for cells of different sites, where in RL10 FDD different sites are not in general frame-synchronized (except by chance). In TDD different sites must be frame-synchronized. But in FDD, the DL RS received from cells of two different sites have a random frame offset with respect to each other and hence the RS symbols may or may not overlap (interfere) in any given measurement position. But as you said, because of irregular cell shapes, it may well happen that there are spots where there is strong interference between RS received from cells of different sites, i.e. RS symbols collide in both time and frequency. If you have a TDD network, this scenario happens probably quite often. In these cases, perhaps depending on the SINR estimation method used by the particular receiver, the estimation result may be unreliable.
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 30
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 31
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 32
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 33
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 34
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 35
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 36
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 37
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 38
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 39
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 40
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 41
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 43
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 44
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 45
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 46
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 47
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 48
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 49
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 50
The aggregation level used for Broadcast, Paging Preamble assignment and RA response is specified by parameters and is limited to aggregation levels 4 and 8 to ensure reliable decoding across the cell coverage area. The parameters for these along with the recommended values are listed below:
pdcchAggPreamb = 4
pdcchAggPaging = 4
pdcchAggRaresp = 4
pdcchAggSib = 4
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 51
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 52
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 53
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 54
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 55
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 56
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 57
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 58
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 59
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 60
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 61
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 62
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 63
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 64
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 65
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 66
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 67
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 68
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 69
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 70
The feature allows for creation one or two non-overlapping zones where no uplink PUSCH transmission will take place SRS is automatically disabled
If two PUSCH masks are configured then the ranges {ulsPuschMaskStart .. ulsPuschMaskStart+ulsPuschMaskLength-1} shall not overlap
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 71
LTE FDD Initial Parameter Planning
RA4120BEN60GLA0 72
Recommended