Random Access Design for UMTS Air-Interface Evolution
Networks & Enterprise Bus., Motorola, Arlington Heights, ILDOI: 10.1109/VETECS.2007.222 Conference: Vehicular Technology Conference, 2007. VTC2007-Spring. IEEE 65th
Source: IEEE Xplore
Comprehensive long term evolution of the Universal Mobile Telecommunications System (UMTS) specifications is currently ongoing to provide significant improvement over the current release. Important goals for the evolved system include significantly improved system capacity and coverage, low latency, reduced operating costs, multi-antenna support, flexible bandwidth operations and seamless integration with existing systems. To ensure low latency, users must be able to establish a connection to the network quickly. This paper provides a preliminary design and procedure for the random access channel used to establish a connection when the mobile is not yet time-synchronized to the network in the uplink.
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ABSTRACT: In this paper, a comparative analysis of the performance of the non-synchronized initial random access channel in mobile WiMAX and E-UTRA systems under different conditions (fast fading, multiuser interference) is carried out. The analysis is focused on the correlation properties of the code sequences used in each case. We evaluate their ability to provide low values for false alarm and erroneous detection probabilities (detecting a sequence that has not been transmitted) at the same time as guaranteeing low non detection probabilities of the effectively transmitted sequences.Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th; 05/2009
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ABSTRACT: In this paper, a comparative analysis of the performance of the nonsynchronized initial random access channel in Mobile WiMAX and E-UTRA systems under different conditions (fast fading, multiuser interference) is carried out. The analysis is focused on the correlation properties of the code sequences used in each case. We evaluate their ability to provide low values for false alarm and erroneous detection probabilities (detecting a sequence that has not been transmitted) at the same time as guaranteeing low nondetection probabilities of the effectively transmitted sequences. Results show the promising performance of the E-UTRA scheme, even in high mobility scenarios, where the Doppler effect requires additional considerations to guarantee the correct system operation.Telecommunication Systems 01/2010; 43(3-4):279-294. DOI:10.1007/s11235-009-9202-9 · 0.71 Impact Factor
Conference Paper: Throughput analysis of TDD LTE Random Access Channel.[Show abstract] [Hide abstract]
ABSTRACT: TDD version of rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) provides a mode of operation in a single block of spectrum with Uplink and Downlink 1ms-subframes multiplexed in time. Limited number of Uplink subframes coupled with unequal number of Physical Random Access Channel (RACH) opportunities per subframe results in TDD LTE RACH resources and the offered load being non-uniform in time. Thus, performance of TDD LTE RACH is different from classical multi-channel slotted ALOHA analyzed in the past. We derive the offered load in each subframe assuming the details of TDD LTE configuration and subsequently compute the normalized throughput under Poisson load. We show that non-uniform RACH resource allocation across subframes does not cause throughput degradation as long as the resources are located in the same half of the 10ms-radio frame. For selected “worst-case” 3GPP configurations we show that the degradation is less than 10%. Our results provide capacity estimates for the RACH in TDD LTE which can be used for sizing under different traffic conditions.IEEE 22nd International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2011, Toronto, ON, Canada, September 11-14, 2011; 01/2011
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