Zte ZXG10-OB06, Техническое руководство

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Chapter 4 - System Functions
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• General overload:
The OB06 instructs BSC that the receiver must reduce the traffic.
According to the protocol, it indicates the TRX overload, downlink
CCCH overload and ACCH overload.
The TRX processor provides data from the bottom running operating
system. The downlink CCCH load calculation is same as the above-
mentioned CCCH LOAD IND. The CHP provides the RACH load, and the
PAGCHM provides the PCH load. The ACCH load calculation is not
determined.
According to the negotiation with BSC, the current general overload
(OVER LOAD) is only used to report the RACH load that is provided by
the CHP.
E r r o r I n d i c a t i o n
Figure 58 shows the error indication procedure.
F
I G U R E
5 8 – E
R R O R
I
N D I C A T I O N
MS LAPDm FURRM HPIMan LAPD
BSC OAMM
Dm_MDL_ERR
OR_IND
DL_DATA_REQ (ERROR IND)
(ERROR IND)
The ERROR IND message that OB06 send to BSC indicates that the
following abnormalities happen in the radio data link layer.
The ERROR IND message contains the related error cause information,
including the following causes:
• Protocol errors, as listed in Sections 5.6.4, 5.7.3 and Appendix G in TS
GSM 04.06.
• Error with one link layer. In other words, the I-frame is repeated for
N200 times but is not acknowledged.
• The SABM or DISC frame is repeated for N200 times but is not
acknowledged.
• The SABM frame received in the multiframe establishment status.