Jijun Luo

Bio: Jijun Luo is an academic researcher from Siemens. The author has contributed to research in topics: Communications system & Remote radio head. The author has an hindex of 10, co-authored 69 publications receiving 414 citations. Previous affiliations of Jijun Luo include Nokia Networks.

Investigation of radio resource scheduling in WLANs coupled with 3G cellular network

Abstract: In this article, based on the overview of network coupling structure between radio access technologies, the concept of joint radio resource management built onto the reference structure is introduced. In order to optimize usage of radio resource and jointly designed from the user perspective, a joint scheduling mechanism allowing traffic to be split over a tightly coupled radio network supported by an adaptive radio multihoming approach is deliberately discussed. With respect to the time-division access scheme in HIPERLAN/2, which is selected as one example of WLAN, algorithms and performance of traffic scheduling in such a radio access technology are given. The required synchronization scheme supporting traffic splitting is also introduced.

Method for performing synchronization in radio communications systems

Abstract: The invention relates to a method for operating a radio communications system with at least two units of a radio resource, each comprising a partial radio network and a radio access device for the at least two units of the radio resource or for operating at least two radio communications systems (UMTS, WLAN), each comprising a radio network with one radio access device (NODE B, AP) each. The radio coverage areas of the at least two radio access devices (NODE B, AP) locally overlap in at least one overlapping area. The partial radio networks or radio networks are connected to a network device (GE), and at least one radio station (UE) is located in the at least one overlapping area. At least one signal is sent from the at least two radio access devices (NODE B, AP) to the at least one radio station (UE). According to the invention, the at least one radio station (UE), based on the times at which the at least two signals are received, determines at least one parameter for a synchronization of the communication in the at least two radio communications systems (UMTS, WLAN). The invention also relates to a method in which the network device (GE), based on times at which at least two signals in the at least two radio communications systems (UMTS, WLAN) are received, determines at least one parameter for a synchronization of the communication in the at least two units of the radio resource of the one radio communications system or in the at least two radio communications systems (UMTS, WLAN). The invention also relates to a network device (GE) and to a subscriber radio station (UE) for carrying out the inventive method.

Method for the transmission of information in a cellular radio communication system with radio sectors

Abstract: The invention relates to a method for the transmission of information in a cellular radio communication system for several user stations, whereby each radio cell (1, 2, 3, 4, 5, 6, 7) in the radio communication system comprises a base station (NB1, NB2, NB3, NB4, NB5, NB6, NB7), by means of which the information is transmitted to user stations using broadcast and/or point to multipoint connections. According to the invention, at least two radio cells (1, 2, 3, 4, 5, 6, 7) in the cellular radio communication system are each divided into n radio sectors (SXa, SXb, SXc with X = 1 to 7) with n ≥ 2 and the information is transmitted in each of the n radio sectors of a radio cell with a temporal displacement. The invention serves to improve the interference situation. The information is advantageously transmitted in n radio sectors without any temporal overlap. Radio sectors can particularly advantageously be collected in a group, alternately comprising the lowest coupling factors with regard to radio transmission and the transmission of information carried out for each group at a different time.

Method for downloading data in a radio communications system

Abstract: According to one aspect of the invention, in a radio communications system comprising at least one base station (BS1, BS2) provided with means for transmitting data via a communication link (BCCH; V), wherein the data is divided into a plurality of data packets and being transmitted via the communication link to at least one receiving station (UE). To reduce power consumption it is proposed that the downloading of the data packets is halted if it is determined that a data packet has not been received or a corrupted data packet has been received by the receiving station, the missing or corrupted data packet is retransmitted via the same or a different communication link at a later time.

Transmit power control method in a multi-carrier radio system

Abstract: The method involves associating a connection (C) with different frequency carriers (f1-f8), sending signals via the carriers from the transmitter station to a receiver station, dividing the carriers into groups (G1,G2), each with at least two carriers, sending a transmission power control signal (CTR1,..) to the transmitter station for each group and using the control signals to control transmission power for each carrier of the relevant group. Independent claims are also included for the following: (a) a radio system (b) a transmitter station (c) and a receiver station.

On the capacity of a cellular CDMA system

Abstract: It is shown that, particularly for terrestrial cellular telephony, the interference-suppression feature of CDMA (code division multiple access) can result in a many-fold increase in capacity over analog and even over competing digital techniques. A single-cell system, such as a hubbed satellite network, is addressed, and the basic expression for capacity is developed. The corresponding expressions for a multiple-cell system are derived. and the distribution on the number of users supportable per cell is determined. It is concluded that properly augmented and power-controlled multiple-cell CDMA promises a quantum increase in current cellular capacity. >

Exposure apparatus, and device manufacturing method

Abstract: An exposure apparatus for emitting exposure light onto a substrate via a projection optical system and a liquid to expose the substrate includes a supply pipe which supplies the liquid; a recovery pipe which recovers the liquid; a connection pipe which connects the supply pipe and the recovery pipe; and a switching device which switches a flow path of the liquid so that when liquid supply is stopped, the liquid that has flowed into the supply pipe flows to the recovery pipe via the connection pipe. The apparatus may further include a temperature regulation apparatus connected to the supply pipe, which performs temperature regulation of the liquid supplied to the supply pipe, and has a rough temperature regulator which roughly regulates the temperature of the liquid, and a fine temperature regulator which is arranged between the rough temperature regulator and the supply pipe and performs fine regulation of this temperature.

Exposure apparatus and method for producing device

Abstract: There is provided an exposure apparatus capable of forming a desirable device pattern by removing unnecessary liquid when performing exposure by projecting a pattern onto the substrate via a projection optical system and the liquid. The exposure device projects an image of the pattern onto the substrate P via the projection optical system and the liquid so as to expose the substrate P. The exposure device includes a liquid removing mechanism 40 which removes the liquid remaining on a part 7 arranged in the vicinity of the image plane of the projection optical system.

Multi-radio coexistence

Abstract: In a wireless communication device with multiple radio access technologies (RATs), frame timing for one RAT may be aligned with a frame timing of another RAT so as to reduce a number of communication frames of the different RATs that overlap in time with each other. The aligning reduces the number of communication frames that are subject to cancellation due to interference. Alignment may reduce a number of transmit frames of one RAT that overlap with multiple receive frames of another RAT. Alignment may reduce a number of receive frames of one RAT that overlap with multiple transmit frames of another RAT.

Apparatus and method for uplink power control for a wireless transmitter/receiver unit utilizing multiple carriers

Abstract: A method and apparatus for determining uplink power in a wireless transmit receive unit (WTRU). The WTRU operates in a carrier aggregated system. The WTRU is configured to receive a plurality of uplink power parameters indexed to one of a plurality of uplink carriers and receive a transmit power control command indexed to the one of the plurality of uplink carriers. The WTRU is configured to determine a pathloss of the one of the plurality of uplink carriers and determine a transmit power for the one of the plurality of uplink carriers based on the plurality of power parameters, the transmit power control command, and the pathloss.