摘要:
Interference in a cellular CDMA network due to mobile stations causing multiple use of one carrier frequency in neighboring cells is cancelled. A hard handover is implemented by defining the phase of a spread spectrum code in a signal transmitted from a base station to a mobile followed by measurement of signal strength in the mobile. Thereafter, the result is reported to the CDMA network, inferring whether the mobile interferes with the base station of the neighboring cells. If interference is present, the surrounding base stations are informed about the mobile station channel used, and this information is taken into account in the receivers of signals transmitted by other mobiles within the cell. The measurement results of the mobile are provided as initial values to the parameters required by the initialization of the interference cancellation routines performed in a neighboring base station. In another embodiment, it is decided whether the mobile station has to be monitored at the neighboring base stations by comparing the measurement results with a predetermined threshold value.
摘要:
A receiver, and a method for estimating received power in a cellular radio system having in each cell at least one base station communicating with mobile stations within its coverage area. The mobile stations measure strength of the signal received from a base station, and report the measurement results to that base station. To improve power adjustment, a model describing the dynamic behavior of the signal is created for the received power on each connection. The model is utilized for power adjustment, as well as for making handover decisions.
摘要:
Transmission antenna diversity can be set up on a data transmission connection between a transmitting unit, wherein there are several transmission antenna routes, and a receiving unit. A broadcast signal is transmitted through all transmission antenna routes of the transmitting unit, with the aid of these signals a choice is made in the receiving unit of the optimum transmission antenna route and a message of the choice is transmitted to the transmitting unit, which transmits user data through the transmission antenna route connected for use. The broadcast signal of each transmission antenna route can be shaped by an individual signal shaping method which is different from the others and a transmission antenna route is connected for use based on the received antenna choice message, individually for each receiving unit.
摘要:
A data transmission method and system is provided. Symbols to be transmitted are encoded (200) in a first transceiver into at least two data flows using space-time coding. The data flows are transmitted by means of at least three radiation patterns (218 to 224) to a second transceiver (230). The radiation patterns (218 to 224) transmitting the data flows in the first transceiver are varied.
摘要:
The present document discloses a solution for utilizing guard time intervals of another wireless communication system. First, it is detected in a first wireless communication apparatus of a first wireless communication system a guard time interval following a transmission of a second wireless communication apparatus of a second wireless communication system. Thereafter, the first wireless communication apparatus is configured to schedule a transmission in the first wireless communication system to a transmission time interval starting on or after the beginning of the detected guard time interval and ending within the detected guard time interval of the second wireless communication system.
摘要:
A system for managing wireless interaction based on communication performance. Source apparatuses may desire to establish wireless links to target apparatuses. Prior to initiating new wireless links, source apparatuses may evaluate whether the establishment of new wireless links will increase the cumulative performance of the wireless communication environment, wherein the wireless communication environment may comprise the apparatuses communicating wirelessly within transmission range of a source apparatus. The evaluation may determine, for example, whether predicted cumulative performance of the wireless communication environment after the new wireless link is initiated would be greater than cumulative performance prior to link initiation.
摘要:
It is disclosed a method (and related apparatus) comprising indexing at least two source streams from at least one source entities and/or at least two sink streams to at least two sink entities, and determining that at least one signal from the at least one source entity to the at least two sink entities is to be relayed based on a result of the indexing.
摘要:
The present invention concerns a diversity transmitter, comprising: transmit symbol input means (1) for inputting a symbol matrix (b) to be forwarded to a transmit processing means (2), said transmit processing means comprising supplying means (2a) for supplying columns of said symbol to a plurality of at least two branches, each branch being supplied to a respective one of spatial channels (A1, . . . , Am) for transmission to a receiver, a parallelization means (2b) adapted to provide within each branch at least two parallel channels allocated to a respective user, and weighting means (2c) adapted to subject the symbol signals on at least one of said branches to an invertible linear transformation with a fixed complex weight, the complex weight being different for at least two parallel channels. The present invention also concerns a corresponding diversity transmission method.
摘要:
The present invention relates to a closed-loop signaling method for controlling multiple transmit beams, comprising the steps of receiving (S21) a plurality of at least two beams from a first transceiver (Node_B) via a plurality of transmission channels at a second transceiver (UE), evaluating (S22), at said second transceiver, characteristics of said plurality of beams received at said second transceiver, determining at least one dominant beam using said characteristic, deriving (S24) control information for being fed back from said second transceiver (UE) to said first transceiver (Node_B), based on said evaluated characteristics, wherein said control information for dominant characteristics is allocated a different quantization resolution as compared to a less dominant beam (S25, S26, S27). Also, the present invention relates to a transceiver device (UE), adapted for being used in such a closed-loop signaling method for controlling multiple transmit beams.
摘要:
A wireless communication system is disclosed that includes forming one or more beam patterns by a transmitter at a first time, where the beam patterns are made up of a first set of beam patterns used to transmit data during the first time, and a second set of beam patterns used to transmit data during a subsequent time. A pilot signal is transmitted on each of the beam patterns and is detectable and decodable by one or more receivers. The receivers test the quality of the beam patterns and transmit an indicator to the transmitter that relates to one of the beam patterns that has a high channel quality. The transmitter determines channel estimation, transmission scheduling, and/or resource allocation based, at least in part, on the indicator.