Zte ZXG10-OB06, Техническое руководство

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ZXG10-OB06 (V1.0) Integrated Outdoor GSM Base Station Technical Manual
54 Confidential and Proprietary Information of ZTE CORPORATION
Figure 34 shows a channel activation failure.
F
I G U R E
3 4 – U
N S U C C E S S F U L
C
H A N N E L
A
C T I V A T I O N
i. TRX detects MS random access request on RACCH, and activates a
channel for MS.
ii. BSC decides the channel to use, and sends the CHAN ACTIV
message to the TRX to enable that channel. This message contains
the following:
• Activation reason (immediate assignment, allocation,
asynchronous /synchronous or additional allocation).
• Channel ID.
• Complete channel description (full/half rate, voice/data,
code/rate adaptation, frequency-hopping sequence, key, and so
on). If there is encrypted information, it uses the encryption
activation mode.
iii. When FURRM module receives the CHAN ACTIV message, it sends
related information (activation reason, and so on) to CHP using
HPIMan module, for processing. It reports the results to BSC when
the response arrives.
iv. On activation of the channel, TRX responds with the CHAN ACTIV
ACK message, which contains the number of the current frame.
BSC uses this frame number to decide the Starting Time parameter
in the immediate assignment message that it sends to MS.
v. If TRX cannot activate the channel, it returns CHAN ACTIV NACK
message that contains the failure cause. There may be different
possible causes:
• O&M interference (for example, channel blocked)
• Resource unavailability (for example, without voice encoder)
• Equipment error
• Channel activated