Sierra Wireless AirPrime SL808 Series Product Technical Specification & Customer Design Manuallines page 86

Product Technical Specification & Customer Design Guidelines
Table 7-2: Supported GSM / GPRS specifications (Continued)
Item
Link Adaptation (LA)
EGPRS Incremental
Redundancy (IR)
GPRS multislot class 10
EGPRS multislot class 12
NC0
DPC
One-phase packet access for
GPRS
One-phase packet access for
EGPRS
Two-phase packet access for
GPRS
Two-phase packet access for
EGPRS
RLC-acknowledged operation
mode
RLC-unacknowledged
operation mode
LLC-acknowledged
transmission mode
LLC-unacknowledged
transmission mode
GSM network operation mode
I and II
86 Proprietary and Confidential - Specifications subject to change
Comments
Together with IR (next table entry), LA adapts the EGPRS
transmission to meet changing radio link conditions.
IR adjusts the physical layer code rate to actual channel
conditions by incrementally transmitting redundant information
until decoding is successful.
Automatic Repeat Request (ARQ) protocol takes care of
requesting and retransmitting incorrectly received blocks. ARQ
enables both dynamic RLC window management (to avoid
window stalling) and dynamic RLC polling frequency (to
minimize retransmission delay and save radio bandwidth).
Multislot class 10 and 12 allow for dynamic allocation of time
slots. See Table A-4 on page 77.
NC0 is the normal mode of control for a GPRS mobile in which
the MS (Mobile Station) performs autonomous cell reselection.
Downlink Power Control
Allows the network to adjust the downlink power of any
dedicated channels on the BTS based on measurement reports
sent by the mobile. This allows the network to reduce
interference between multiple mobiles while still maintaining
adequate signal quality for the individual mobiles.
In establishing a TBF (Temporary Block Flow) connection, the
MS (Mobile Station) requests either one-phase or two-phase
packet access.
In one-phase access, the network responds to a packet channel
request by sending a packet uplink assignment message and
reserving resources for uplink transfer of a number of radio
blocks.
In two-phase access, a packet resource request is sent on
receipt of the packet uplink assignment.
The RLC-acknowledged and LLC-acknowledged modes are
used to ensure the integrity of received data where QoS
requires it. RLC (Radio Link Control) acknowledgment is
typically the default (depending on the network and user profile).
LLC-acknowledgment is optional and ensures that all LLC
(Logical Link Control) frames are received without error. Since
LLC-acknowledged mode requires acknowledgement of all LLC
frames, the mode has an impact on throughput.
The Network Operating Mode specifies the coordination of
paging for circuit-switched and packet-switched services.
Mode I - The mobile can receive circuit-switched pages while in
a packet-switched call.
Mode II - The mobile cannot receive a circuit-switched page
while in a packet-switched call, as it would force the mobile to
constantly monitor its CCCH channel.
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