HCA, that is, mixed channel allocation, refers to providing as many available channels as possible for communication devices in each cell in the most effective way of spectrum utilization in the case of multi-channel sharing in a cell-based cellular mobile system using channel multiplexing technology. General channel allocation schemes can be divided into three categories:

Fixed channel assignment (FCA), dynamic channel allocation (DCA) and mixed channel assignment (HCA). The process of channel allocation generally includes three steps: call access control, channel allocation and channel adjustment, in which different channel allocation schemes are different.

ingredient

In HCA scheme, all channels are divided into two parts: some channels are fixed in some cells, that is, some channels are isolated; The other part of the channel is stored in the central storage area and shared by all users in the system, that is, some channels are shared. HCA is a compromise between FCA and DCA, so it is a mixed distribution. (For FCA and DCA, please refer to the corresponding entries. )

Include content

The main schemes of HCA include: channel reordering HCA and HCA scheme of queuing (not blocking) when the call reaches the unavailable channel.