Reference Manual

Table Of Contents

Function Change

At switch-over to the new software, trafﬁc is affected. This implies a

restart as in chapter Restart and Recovery followed by conﬁguration and

enabling as speciﬁed in chapter Functionality Administration.

At start-up (in START_CF_CMD), negotiation will take place between

BTS and BSC. The BTS sends a NEGOTIATION REQUEST message

to the BSC including a list of valid IWDs supported by the BTS. A set

of IWDs is chosen by the BSC in NEGOTIATION REQUEST ACK

message and is sent to the BTS which adapts to the selected IWDs. This

backward compability function introduces the possibility to connect a

BTS (R8) to a BSC (R7). It is also possible to run a BSC (R8) with a

BTS (R7), and with BTS (R8) in either R7 mode or R8 mode.

A BSC (R7) will answer with a reject message,

NEGOTIATION_REQUEST_NAK, to the NEGOTIATION_REQUEST

message as it is not supported by BSC (R7). The BTS will then adapt

to IWDs according to BSC (R7) when a

NEGOTIATION_REQUEST_NAK message is received.

36.3 Operational Conditions

36.3.1 Operation and Maintenance

The visual indicators relevant to Function Change are described in

chapter Operation and Maintenance Terminal.

36.3.2 Capabilities

The download of software via the A-bis to the RBS and internal transfer

of software ﬁles does not affect the normal operation of the RBS.

Switch-over, that is, software start of an RBS, takes less than 60

seconds.

The switch-over time is deﬁned as the time elapsed from the reception

of a start command via A-bis to when the Main RU is ready for

re-establishment of the link to the BSC.

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EN/LZT 720 0008 R1A

2001-06-26