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User Manual
Airbridge cBTS3612 CDMA Base Station
Resource blocking function: cells, carriers or channel elements can be blocked
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or unblocked.
Resource checking function: Main control software checks the resources of
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BCPM regularly, such as dedicated channels and common channels, to make
sure the resources allocated on both sides are identical.
2) Cell configuration and message updat e
This unit comprises three sub-modules:
Cell configuration function: BSC makes logic configuration to the cell according
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to the availability status of the logic resource reported by BTS. Specifically, they
are carrier attribute configuration of BTRM and cell common channel attribute
configuration of BCPM. Carrier attribute configuration parameters include
carrier band, carrier absolute frequency point number and carrier transmit gain.
Cell common channel attribute configuration parameters include BASE_ID, cell
ID, pilot PN sequence offset, cell gain, common channel number and attribute
(including pilot type, pilot gain, SCH gain, QPCH quantity, QPCH gain, QPCH
rate, PCH quantity, PCH gain, PCH rate, and ACH quantity).
Overhead message update: after cell configuration, when the cell logic resource
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changes, it is necessary to update the overhead message of the cell. Overhead
message includes system parameter message, access parameter message
and synchronization channel message.
Cell breath control: when the traffic load of adjacent cells is not balanced, BSC
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activates the cell breath control. The main control software reconfigures the cell
attribute parameters as required by BSC, to perform cell breath function.
3) Channel management
This unit comprises 6 sub-modules:
Paging channel message processing: transmit the paging channel message to
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corresponding BCPM according the parameters such as cell ID, absolute
frequency point number and PCN.
Access channel message processing: Main control software sends the access
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channel message received from BCPM access channel to BSC.
Channel allocation and release: when a dedicated channel is to be set up, the
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main control software will first check information such as the carrier absolute
band of the dedicated channel, channel type, RC, rate, frame length, and
whether it is a branch of the existing channel for a softer handoff, then distribute
channel resources in the corresponding channel resource pool and send
message instruction to BCPM to set up the channel. Similarly, when a channel
is to be released, the main control software first sends message instruction to
BCPM to release the channel, then returns the released channel to
corresponding channel resource pool. When a dedicated channel is to be set up
3-3
System Description
3 Software Architecture
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