Sierra Wireless AirPrime SL808 Series Product Technical Specification & Customer Design Manuallines page 90

Product Technical Specification & Customer Design Guidelines
Table 7-2: Supported GSM / GPRS specifications (Continued)
Item
Chase combining
retransmission scheme
HSDPA Compressed Mode
(SL8080/82/84)
Concurrent voice and HSDPA
data
HSDPA Indicator
Receiver equalizer support
Miscellaneous
Fast link adaptation
Vary the effective code rate
HARQ, MAC-HS disassembly
MAC-HS reordering queue
distribution and processing
support
Cell change
Up-switching and down-
switching of PS RAB between
HS-PDSCH and DPCH
Ciphering on the HS channel
Support to not resume the HS
channel if inter-RAT handover
fails, but save the RB mapping
information
Support to not resume the HS
channel if a radio link failure
occurs, but save the RB
mapping information
WINS address support primary
and secondary
(SL8080/82/84)
Voice support
90 Proprietary and Confidential - Specifications subject to change
Comments
The Chase combining retransmission scheme is the simplest
HARQ (Hybrid Automatic Request) link adaptation technique.
HARQ techniques are used to enhance system performance.
Allows the user equipment to interrupt transmission and
reception during a call for brief periods in order to measure the
signal strength of neighboring cells that use different
frequencies.
Allows user interface to display an indicator when HSDPA data
transfer is in progress.
The data rate is adapted to radio conditions.
The effective code rate is varied based on code space
resources.
MAC-HS (High Speed MAC) is the base station MAC (Medium
Access Control) protocol. MAC-HS enables fast radio resource
allocation.
These cell change methods are supported:
Synchronous and non-synchronous
•
Intra-Node B (softer repointing)
•
Inter-Node B (soft repointing)
•
RAB (Radio Access Bearer) and channel mappings between the
HS-PDSCH (High Speed Physical Downlink Shared Channel)
and DPCH (Dedicated Physical Channel) are reallocated
according to volume thresholds and inactivity timers.
Ciphering on high-speed channels protects radio-transmitted
data against unauthorized third parties.
RB (Radio Bearer) mapping information is preserved if a high-
speed channel is dropped due to the failure of an inter-RAT
(Radio Access Technology) transfer.
RB (Radio Bearer) mapping information is preserved if a high-
speed channel is dropped due to a radio link failure.
Primary and secondary IP addresses can be assigned for WINS
(Windows Internet Name Service) name servers.
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