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2008-11-3                                             Security Level:




How to Analyze Crossed Feeder
Issue by DT


                                                              www.huawei.com




   HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential
Outline
• What is crossed feeder issue



• The problems raised by crossed feeder issue



• How to detect crossed feeder issue by DT
What is crossed feeder issue (1)
  The term crossed feeder is used to describe the problem that arises when
  the feeders for two or more sectors in a site are inadvertently connected
  incorrectly. For Example, consider a new cell site that has three sectors,
  A, B, and C:




HUAWEI TECHNOLOGIES CO., LTD.     Huawei Confidential       Page 3
What is crossed feeder issue (2)
The crossed feeder problem would arise
if the feeder for sector A is connected to
sector C and vice versa. When this
happens, the sectors typically continue
to provide good coverage. However, the
network parameters for the two sectors
are also reversed. For example, the
parameters storing the sectors' BCCH
and lists of adjacent sectors would be
swapped.
For example, suppose we run a drive
test through the area served by the cell
whose feeders are crossed display the
ServBCCH attribute on the Map while
the cell sectors are colored by BCCH.
This is what we might see:




HUAWEI TECHNOLOGIES CO., LTD.                Huawei Confidential   Page 4
What is crossed feeder issue (3)

  There are server types of crossed feeder:


          Crossed transmit feeders


          Crossed receive feeders


          Crossed transmit and receive feeders




HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 5
The problems raised by crossed feeder issue




        Normal Situation                               Crossed Feeder Situation




 HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential       Page 6
The problems raised by crossed feeder
issue

    Crossed feeder will raise many problems, such as:


             A greater degree of interference

             A poor uplink signal strength

            A poor performance of handover



HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 7
How to detect crossed feeder issue by DT

Crossed transmit feeders
 Crossed transmit feeders will result in the swap of 2 or
more sectors BCCH frequency and TCH’s. As the sectors are
pointing in the incorrect direction, performance will suffer as
the frequency plan has been changed and a greater degree of
interference will be present.
   In DT, we will find that the handset receives the single
which shouldn't have been received in the current cell.


HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 8
How to detect crossed feeder issue by DT
 Crossed transmit feeders




     In the example shown above, point A is in the area of coverage of Cell D3,
     but the handset at point A receives the stronger signal of Cell D2. It
     indicates that TX feeders were crossed between Cell D3 and Cell D2.


 HUAWEI TECHNOLOGIES CO., LTD.     Huawei Confidential      Page 9
How to detect crossed feeder issue by DT

  Crossed receive feeders
  It is not easy to detect this fault by DT, because the BCCH
frequencies will appear exactly as they were designed. However,
the statistics for the cell would help us to detect the fault:
      Uplink signal strength would be very poor
      Link balance would be larger than expected
      Handover success rate would be very low




  HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 10
How to detect crossed feeder issue by DT

 Crossed receive feeders
  The MR measurement is very useful in detecting this type of
  feeder cross.
  Uplink-and-Downlink Balance Measurement per TRX and
  TCH Receive Level Measurement per TRX maybe are the
  most useful statistics . For example, if the uplink-and-downlink
  balance is always in level 10 or level 11, we can consider that
  there is something wrong in the receive path of the site, crossed
  receive feeder is a possible problem.

 HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 11
How to detect crossed feeder issue by DT


  Crossed transmit and receive feeder
    The symptom is similar with the fault “crossed transmit
 feeder”, and we can detect the fault by DT easily .




 HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 12
Thank you
www.huawei.com

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DT analysis how to analyze crossed feeder issue by dt

  • 1. 2008-11-3 Security Level: How to Analyze Crossed Feeder Issue by DT www.huawei.com HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
  • 2. Outline • What is crossed feeder issue • The problems raised by crossed feeder issue • How to detect crossed feeder issue by DT
  • 3. What is crossed feeder issue (1) The term crossed feeder is used to describe the problem that arises when the feeders for two or more sectors in a site are inadvertently connected incorrectly. For Example, consider a new cell site that has three sectors, A, B, and C: HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 3
  • 4. What is crossed feeder issue (2) The crossed feeder problem would arise if the feeder for sector A is connected to sector C and vice versa. When this happens, the sectors typically continue to provide good coverage. However, the network parameters for the two sectors are also reversed. For example, the parameters storing the sectors' BCCH and lists of adjacent sectors would be swapped. For example, suppose we run a drive test through the area served by the cell whose feeders are crossed display the ServBCCH attribute on the Map while the cell sectors are colored by BCCH. This is what we might see: HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 4
  • 5. What is crossed feeder issue (3) There are server types of crossed feeder: Crossed transmit feeders Crossed receive feeders Crossed transmit and receive feeders HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 5
  • 6. The problems raised by crossed feeder issue Normal Situation Crossed Feeder Situation HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 6
  • 7. The problems raised by crossed feeder issue Crossed feeder will raise many problems, such as: A greater degree of interference A poor uplink signal strength A poor performance of handover HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 7
  • 8. How to detect crossed feeder issue by DT Crossed transmit feeders Crossed transmit feeders will result in the swap of 2 or more sectors BCCH frequency and TCH’s. As the sectors are pointing in the incorrect direction, performance will suffer as the frequency plan has been changed and a greater degree of interference will be present. In DT, we will find that the handset receives the single which shouldn't have been received in the current cell. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 8
  • 9. How to detect crossed feeder issue by DT Crossed transmit feeders In the example shown above, point A is in the area of coverage of Cell D3, but the handset at point A receives the stronger signal of Cell D2. It indicates that TX feeders were crossed between Cell D3 and Cell D2. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 9
  • 10. How to detect crossed feeder issue by DT Crossed receive feeders It is not easy to detect this fault by DT, because the BCCH frequencies will appear exactly as they were designed. However, the statistics for the cell would help us to detect the fault: Uplink signal strength would be very poor Link balance would be larger than expected Handover success rate would be very low HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 10
  • 11. How to detect crossed feeder issue by DT Crossed receive feeders The MR measurement is very useful in detecting this type of feeder cross. Uplink-and-Downlink Balance Measurement per TRX and TCH Receive Level Measurement per TRX maybe are the most useful statistics . For example, if the uplink-and-downlink balance is always in level 10 or level 11, we can consider that there is something wrong in the receive path of the site, crossed receive feeder is a possible problem. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 11
  • 12. How to detect crossed feeder issue by DT Crossed transmit and receive feeder The symptom is similar with the fault “crossed transmit feeder”, and we can detect the fault by DT easily . HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 12