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ABSTRACT: In 3GPP W-CDMA, a random access channel (RACH) is used for
random-access transmission from the user equipment. The RACH may also be
used to carry short packets. The RACH transmission is based on the
slotted ALOHA approach with fast acquisition indication. In this paper,
the performance of the RACH channel with respect to delay and throughput
is analyzed for a 19-cell omni system under fading conditions. An
adaptive persistence control algorithm for the slotted-ALOHA system is
also presented
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd; 02/2001
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ABSTRACT: A high data rate proposal for a 1.25 MHz DS-CDMA system, called
1XTREME (1xEV-DV), is capable of supporting peak rates of up to 4.8 Mbps
and average data rates of approximately 1 Mbps. It is a true evolution
of the cdma-2000 CDMA system, being fully backward compatible and
therefore able to support both voice and data users on the same carrier.
A new forward shared channel (F-SHCH) with an associated forward control
channel carries the high-speed packet data. The associated forward
control channel structure is shown to offer a 30% increase in the active
users on the system over a typical structure. Furthermore, additional
channels are added in the reverse link to support the various
throughput-enhancing features of 1XTREME. In this paper, the details of
the air-interface are presented along with the description of each
channel. Also, the simulated performance of the F-SCH and the forward
control channels are presented
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd; 02/2001
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ABSTRACT: The overall throughout and delay performance of the 1XTREME
proposal in 3GPP2 and the HSDPA proposal in 3GPP are provided. The
performance sensitivity to call model, peak data rate, hybrid ARQ, C/I
feedback delay, and multipath interference is examined using a
quasistatic system simulator. In all cases, performance is bounded using
two simple scheduling approaches, maximum C/I and round robin
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd; 02/2001
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ABSTRACT: A key requirement for next generation CDMA systems is to provide a
high bit rate packet data service and improved sector throughput for
both low and high mobility applications. A 1.25 MHz DS-CDMA evolution
called 1XTREME (Third Generation Enhanced Modulation and Encoding) has
been proposed. 1XTREME uses a forward shared channel (F-SHCH) that is
shared by multiple packet data users and is capable of supporting peak
rates of up to 5 Mbps, compared to third generation CDMA system indoor
peak data rates of 460 kbps and 2 Mbps for IS-2000 and W-CDMA,
respectively. In this paper the link performance of the F-SHCH is
evaluated for different modulation and coding scheme (MCS)
configurations. Based on the link results, the average sector throughput
is presented for two simple scheduling algorithms, as well as
performance as a function of the maximum allowed FER operating point
Vehicular Technology Conference, 2000. IEEE VTS-Fall VTC 2000. 52nd; 02/2000
