Sunday, June 27, 2010

Q:how to Plan MAIO and HSN

Ans:

 For telecom engineers, it is very help full to know about MAIO. Basically there is a set of frequencies where the channels are hop to avoid interference that set of frequencies is called MA-LIST. suppose MALIST contained frequencies [A,B,C,D,E,F,G,H,I,J,K,L].
Then MAIO corresponds the starting point of hopping sequence. suppose there are four TRx in one sector. then MAIO will be, for example, 0,2,4.
for first TRx for traffic, the MAIO is 0. means that hopping sequence starts from first frequency in the MALIST, that is frequency A. and for MAIO 2 it starts from frequency C and for MAIO 4 it starts from frequency E.

Also HSN (hopping sequence number), ranges from 0 to 63 . if we use HSN as, for example 4 it means that for MAIO 0, the sequence starts from frequency A and repeats frequencies in following manner.

For MAIO 0 and HSN 4
A,F,K,D,I,B,G,L,E,J,C,H,A,F

For MAIO 2 and HSN 4
C,H,A,F,K,D,I,B,G,L,E,J,C,H

For MAIO 4 and HSN 4
E,J,C,H,A,F,K,D,I,B,G,L,E,J

23 comments:

  1. AnonymousJune 27, 2010 at 7:47 AM

    The test set offers two basic forms of frequency hopping algorithms: cyclic and pseudo random. When set to the cyclic form, the test set and the mobile station are cycled through a fixed repeated pattern of frequencies. There are a total of 64 different frequency patterns that the test set can generate and use. The hopping sequence the mobile station uses depends on the Hopping Sequence Number (HSN) specified in the test set. An HSN of zero corresponds to the cyclic hopping sequence, and values 1 through 63 correspond to the pseudo random patterns. The ARFCNs used in the hopping sequence pattern are determined by the contents of the test set's Mobile Allocation (MA) Table. The entry of the MA Table at which the hopping sequence begins is called the Mobile Allocation Index Offset (MAIO). Note that an MAIO of zero corresponds to the first entry of the MA Table.

    ReplyDelete
  2. Cellular-PlanningOptimizationJune 27, 2010 at 7:49 AM

    For hopping sequence generation, please refer to 3GPP spec. below:

    http://www.3gpp.org/ftp/Specs/archive/05_series/05.02/0502-8b0.zip
    Chapter 6.2.3 Hopping sequence generation

    To check what has explained regarding the resulted MAI using HSN=4, you may generate simulation using dummy ordered frame number and available inputs. It should be randomized instead of cyclic one.

    There are many concept of designing radio networks with frequency hopping in term of hopping scheme selection which is affected to the design of HSN, MAIO, MALL length, etc. Hope your study not stopped at these basic parameters only.

    ReplyDelete
  3. AnonymousJune 30, 2010 at 5:43 AM

    Hopping sequence generation
    For a given set of parameters, the index to an absolute radio frequency channel number (ARFCN) within the mobile allocation (MAI from 0 to N‑1, where MAI=0 represents the lowest absolute radio frequency channel number (ARFCN) in the mobile allocation, ARFCN is in the range 0 to 7023 and the frequency value can be determined according to GSM 05.05 sec 2 with n= ARFCN), is obtained with the following algorithm:
    if HSN = 0 (cyclic hopping) then:
    MAI, integer (0 .. N‑1) : MAI = (FN + MAIO) modulo N
    else:
    M, integer (0 .. 152) : M = T2 + RNTABLE((HSN xor T1R) + T3)
    S, integer (0 .. N‑1) : M' = M modulo (2 ^ NBIN)
    T' = T3 modulo (2 ^ NBIN)
    if M' < N then:
    S = M'
    else:
    S = (M'+T') modulo N
    MAI, integer (0 .. N‑1) : MAI = (S + MAIO) modulo N
    NOTE: Due to the procedure used by the mobile for measurement reporting when DTX is used, the use of cyclic hopping where (N)mod 13 = 0 should be avoided.
    where:
    T1R: time parameter T1, reduced modulo 64 (6 bits)
    T3: time parameter, from 0 to 50 (6 bits)
    T2: time parameter, from 0 to 25 (5 bits)
    NBIN: number of bits required to represent N = INTEGER(log2(N)+1)
    ^: raised to the power of
    xor: bit‑wise exclusive or of 8 bit binary operands
    RNTABLE: Table of 114 integer numbers, defined below:

    Address Contents
    000...009: 48, 98, 63, 1, 36, 95, 78, 102, 94, 73,
    010...019: 0, 64, 25, 81, 76, 59, 124, 23, 104, 100,
    020...029: 101, 47, 118, 85, 18, 56, 96, 86, 54, 2,
    030...039: 80, 34, 127, 13, 6, 89, 57, 103, 12, 74,
    040...049: 55, 111, 75, 38, 109, 71, 112, 29, 11, 88,
    050...059: 87, 19, 3, 68, 110, 26, 33, 31, 8, 45,
    060...069: 82, 58, 40, 107, 32, 5, 106, 92, 62, 67,
    070...079: 77, 108, 122, 37, 60, 66, 121, 42, 51, 126,
    080...089: 117, 114, 4, 90, 43, 52, 53, 113, 120, 72,
    090...099: 16, 49, 7, 79, 119, 61, 22, 84, 9, 97,
    100...109: 91, 15, 21, 24, 46, 39, 93, 105, 65, 70,
    110...113: 125, 99, 17, 123,

    ReplyDelete
  4. AnonymousJuly 6, 2010 at 12:32 PM

    Thats about the one sector....
    What about whole cluster , how do they planned for that??????

    ReplyDelete
  5. AnonymousDecember 13, 2010 at 4:17 AM

    I have no idea!

    ReplyDelete
  6. AnonymousJanuary 12, 2011 at 4:57 AM

    can any one tell me "LOOP BACK TEST"in Drive Test?thanks in advance....
    E-mail: s.kh.e@hotmail.com

    ReplyDelete
  7. UnknownMarch 31, 2011 at 1:32 AM

    hi,

    I dont think that this HSN planning explanation is right. What will happen if we have HSN = 20 in a MAL with 21 freq? the sequence will repeat the same frequency all the time? It doesnt make sense!!!

    Please help

    ReplyDelete
  8. er_raviApril 24, 2011 at 3:09 AM

    Can anybody please tell me about the Drive Test parameters of 3G GSM ??

    ReplyDelete
  9. AnonymousMay 8, 2011 at 10:05 PM

    Hi can anybody explain a little bit more about it?

    ReplyDelete
  10. AnonymousMay 24, 2011 at 6:07 AM

    Its a nice explanation but lit bit confusing

    ReplyDelete
  11. AnonymousJune 14, 2011 at 8:00 AM

    www.telecomfunda.com/forum

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  19. AnonymousMay 29, 2013 at 8:54 PM

    This is a good Freq Hopping HSN and Maio concepts. I wish there is the same detailed explanation if it becomes a cluster of 5 sites??..Now i understand why RF engineers go bald most of the time..:-)

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