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Chapter 4 - Operation and Administration
HARQ Repetitions
4.6.2.4.1
Service Profile ID
This is an auto-sequential number from 1 to a maximum of 64, generated
automatically during creation of a new Service Profile.
4.6.2.4.2
Service Profile Name
The Name of the Service Profile. A unique string of 1 to 32 characters.
4.6.2.4.3
Service Profile Type
The type of a service using the Service Profile. The options available in the current
release are:
Management
Data
PPPoE
VoIP
Reliable Video (decreases dropped packets rate)
Optimized Video (wireless link optimization with content awareness)
4.6.2.4.4
HARQ Repetitions
HARQ (Hybrid-ARQ) is an ARQ (Automatic Repeat reQuest) mechanism that is
implemented at the physical layer together with FEC, providing improved link
performance over traditional ARQ at the cost of increased implementation
complexity. HARQ uses a combination of FEC and ARQ, where blocks of data,
along with a CRC code, are encoded using a FEC coder before transmission;
retransmission is requested if the decoder is unable to correctly decode the
received block. When a retransmitted coded block is received, it is combined with
the previously detected coded block and fed to the input of the FEC decoder.
Combining the two or more received versions of the code block improves the
chances of correctly decoding.
The WiMAX standard supports this by combining an N-channel stop and wait
ARQ along with a variety of supported FEC codes. Doing multiple parallel
channels of HARQ at a time can improve the throughput, since when one HARQ
process is waiting for an acknowledgment, another process can use the channel to
send some more data. WiMAX supports signaling mechanisms to allow
asynchronous operation of HARQ and supports a dedicated acknowledgment
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