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Showing papers by "Rapeepat Ratasuk published in 2006"


Proceedings ArticleDOI
Weimin Xiao1, Rapeepat Ratasuk1, Amitava Ghosh1, R. Love1, Yakun Sun1, Nory Ravi1 
01 Sep 2006
TL;DR: Simulation results show that interference mitigation is implemented through slow fractional power control and interference coordination through UE alignment and FDM resource allocation significantly improve uplink sector and cell edge user throughput performance.
Abstract: Evolved UTRA and UTRAN is being standardized in 3GPP standard group as a long term evolution of the 3GPP radio-access technology. The goal is to achieve 2-4 times the spectral efficiency and user throughput and much smaller latency compared to HSDPA/HSUPA. Single carrier FDMA (e.g. DFT-SOFDM) is the multiple access technique of choice for uplink transmission. Interference control is one of the key elements to achieve the target spectral efficiency and user cell- edge performance requirement, especially for uplink. In this paper, interference mitigation is implemented through slow fractional power control and interference coordination through UE alignment and FDM resource allocation. Simulation results show that these techniques significantly improve uplink sector and cell edge user throughput performance.

93 citations


Patent
14 Sep 2006
TL;DR: In this article, a system and method for establishing a wireless group call from one of a plurality of communication units to others communication units includes a first step of receiving, from a requesting communication unit a request for a group call with other communication units of the group.
Abstract: A system and method for to establish a wireless group call from one of a plurality of communication units to others communication units includes a first step of receiving, from a requesting communication unit a request for a group call with other communication units of the group. A next step includes allocating a common downlink channel for the group call. A next step includes allocating a dedicated uplink channel for the requesting communication unit. A next step includes switching one of the communication units between the common channel mode and a dedicated channel mode depending upon performance criteria.

35 citations


Patent
13 Jul 2006
TL;DR: In this paper, a communications network for enhanced uplink of High-Speed Uplink Packet Access (HSUPA) in 3G wireless communications includes a mobile transceiver unit (605 ).
Abstract: A communications network ( 200 ) for enhanced uplink of High-Speed Uplink Packet Access (HSUPA) in 3G wireless communications includes a mobile transceiver unit ( 605 ). The mobile transceiver unit is operable to use a channel prediction to estimate a power margin of one or more dedicated channels, predict a power margin for an acknowledgement transmission based on transmission parameters, reserve a power margin for a channel quality indicator (CQI) transmission, and determine an Enhanced Transport Format Combination (E-TFC) for an uplink data packet transmission based on an available power margin. The communications network also includes a communications network node ( 610 ) operable to transmit a power control signal to the mobile transceiver unit.

7 citations


Patent
27 Nov 2006
TL;DR: In this paper, the authors proposed improved sequential redundancy augmentation on turbo-coding basis and automatic request for re-transmission includes first stage 102 of punching data stream during first transmission affording set of non-punched sections of first lattice.
Abstract: FIELD: communication systems; coding in communication systems using turbo codes. ^ SUBSTANCE: proposed improved sequential redundancy augmentation on turbo-coding basis and automatic request for re-transmission includes first stage 102 of punching data stream during first transmission affording set of non-punched sections of first lattice. Next stage 104 involves punching data stream for second transmission affording set of non-punched sections of second lattice. Still next stage 106 includes combination of non-adjacent and non-punched sections of first and second lattices in decoder affording composite pattern with uniformly distributed sections. In this way unified punching scheme is created. ^ EFFECT: reduced rate of frame error occurrence due to sequentially augmented redundancy. ^ 8 cl, 10 dwg, 1 tbl

1 citations


Patent
30 Jun 2006
TL;DR: In this paper, the authors proposed a method to provide a nominal best effort data rate based on a Quality of Service (QoS) requirement of a user data connection, the method comprising assigning (105) a service priority based on the QoS requirement, and assigning (110) the nominal best-effort data rate for the service priority using a predetermined function.
Abstract: A method to provide a nominal best effort data rate based on a Quality of Service (QoS) requirement of a user data connection, the method comprising assigning (105) a service priority based on the QoS requirement, and assigning (110) the nominal best effort data rate for the service priority using a predetermined function. Further, it comprises of a method to determine a scheduling priority value for a user data connection by providing a relative fairness. Furthermore, the method comprises a method to satisfy a delay requirement for a delay sensitive data connection through a scheduling.