-
[show abstract]
[hide abstract]
ABSTRACT: In this paper, performance of VoIP service on LTE UL system is studied and analyzed via semi-static system level simulations. Simulations show that different scheduling schemes have a big influence on the UL VoIP capacity - semi-persistent method is quite promising due to its ability to decrease DL signaling overhead and a good performance that is comparable to more advanced methods. The impacts of different VoIP packet sizes, different usage scenarios and different scheduling mechanism are analyzed as well. Those are concluded from the simulation results.
Communications, 2007. APCC 2007. Asia-Pacific Conference on; 11/2007
-
[show abstract]
[hide abstract]
ABSTRACT: This paper presents an effective scheduling scheme called semi-persistent scheduling for VoIP service in LTE system. The main challenges of effectively supporting VoIP service in LTE system are 1) the tight delay requirement combined with the frequent arrival of small packets of VoIP traffic and 2) the scarcity of radio resources along with control channel restriction in LTE system. Simulation results show that semi-persistent scheduling can support high system capacity while at the same time guaranteeing the QoS requirements such as packet delay and packet loss rate of VoIP. Furthermore, semi- persistent scheduling requires less control signaling overhead which is very important for efficient resources utilization in a practical system.
Wireless Communications, Networking and Mobile Computing, 2007. WiCom 2007. International Conference on; 10/2007
-
[show abstract]
[hide abstract]
ABSTRACT: This paper presents approaches of link to system mapping for OFDM/multi-carrier mobile communications systems. Mainly, the effective SINR method is highlighted, which includes EESM and MI-ESM. It is shown how the multi-state channels are integrated into a single state in system simulator with effective SINR approach and why the effective SINR can represent the characteristics of multiple sub-carrier SINR. It is also discussed what the main advantages and disadvantages for them are and how they can influence on the RRM design of the systems. Furthermore, indication is given on how to construct a link-to-system mapping table (MCS (beta value), SINR, BLER)
Mobile Technology, Applications and Systems, 2005 2nd International Conference on; 12/2005
-
[show abstract]
[hide abstract]
ABSTRACT: We analyze, by means of link and network simulations, the gain in capacity, throughput and packet delay reduction achievable by using an advanced dual antenna interference suppression receiver in EGPRS terminals. EGPRS is the enhanced packet radio system of the GSM standard. We focus on a small macrocellular environment with severe cochannel interference, which is the most capacity limited scenario. The results show significant gains from interference suppression and diversity.
Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th; 06/2004
-
[show abstract]
[hide abstract]
ABSTRACT: In this paper the performance of a dual antenna reception in WCDMA downlink is studied on the link and network levels for circuit switched service of 64 kbps. An effect of penetration diversity terminals and channel parameters to potential diversity gain are investigated from a point of view of two receivers; dual antenna RAKE and a space-time chip equalizer. Results indicate that the penetration of diversity terminals should be large before the performance gain in link level can be turned into significant increase in system capacity.
Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual; 05/2003
