549 results about "Packet data transmission" patented technology

A hybrid ARQ scheme is used incremental data packet combining. In an example embodiment, the hybrid ARQ scheme with incremental data packet combining employs three feedback signaling commands: ACK, NACK, and LOST. Using these three feedback commands, the hybrid ARQ scheme with incremental data packet combining provides both robustness and good performance. This scheme is particularly advantageous in communication systems with unreliable communication channels, e.g., a fading radio channel, where forward error correction (FEC) codes are used and some of the code symbols are more important than other code symbols. Benefits include increased throughput and decreased delay of the packet data communication.

A wireless communication network includes a base station system that transmits sector congestion information to influence mobile station sector selection processing. In an exemplary embodiment, where at least some of the mobile stations being supported by the network autonomously select the network sector from which they wish to receive forward link packet data transmissions, an exemplary base station influences that sector selection processing by transmitting congestion information on a per sector basis. Complementing that transmission by the network, an exemplary mobile station incorporates consideration of the sector congestion information into its autonomous sector selection processing logic. Thus, where potentially large numbers of mobile stations individually select the “best” sector from a candidate set of sectors, the network can perform load balancing by advertising sector congestion levels, so that mobile stations can choose (or avoid choosing) a given sector based at least in part of the congestion information.

The present invention provides a method and an apparatus for assigning a channel in response to a request for service for a mobile station in a wireless communication network serving a plurality of regions, such as cells in a digital cellular network. The mobile station may be located in one of the plurality of regions. The method comprises determining a first indication of congestion on a forward access channel and a second indication of congestion on a random access channel and assigning at least one channel of a plurality of channels to the mobile station based on the determined first and second indications of congestion. Based on the first indication of congestion, a first threshold may be adjusted for the forward access channel and a second threshold may be adjusted based on the second indication of congestion on the random access channel. A service type of the request for service and a condition of wireless communication environment may be determined for transmission of data over the wireless communication network and to decide if a specific signaling connection for the mobile station located in one of plurality of regions shall be established in a particular mobile station state including a cell dedicated channel state and a cell forward access channel state based on the service type and the condition of wireless communication environment. In this manner, signaling requests, such as radio resource control signaling requests may be classified into different service types and different radio frequency environment conditions, providing an efficient packet data transmission in a wireless communication system by deciding which state to use under different scenarios. By including a wireless communication environment condition, such as the current radio frequency environment status in a channel assignment decision making, a signaling connection may not experience an inferior quality and may avoid a delay and occurrences of dropped connections.

Disclosed is a method for assigning packet data to be transmitted to a radio packet data channel of a base station system in response to a packet traffic transmission request for a plurality of mobile stations in a mobile communication system. The method comprises collecting the packet traffic transmission requests of the radio packet data channel for the mobile stations; selecting at least one of the mobile stations from the collected packet traffic transmission requests; transmitting to the selected mobile station a channel assignment message including information about a data rate, data transmission durations of the radio packet data channel and start points of the data transmission durations for the selected mobile station; and transmitting the packet data to the selected mobile station at the start time of the data transmission durations at the data rate.

In a method for the transmission of data packets (D) from a transmitter (TR) to a receiver (RE) identification of transmitted data packets are stored. Defective data packets (D) are detected by the receiver (RE), status messages (S) which request defective data packets for retransmission are sent from the receiver (RE) to the transmitter (TR) and retransmissions of requested data packets are performed according to the status messages (S). The transmitter (TR) evaluates a first status message (S11) with an identification of at least one first requested data packet and retransmits the first data packet. The transmitter (TR) then initializes a timing unit according to the retransmission of the first data packet, wherein the timing unit or a threshold for the timing unit is attributable to the first data packet. When the transmitter evaluates a further status message (S12) and detects at least one further data packet that is requested for a retransmission, it selects the further data packet if the timing unit has reached the threshold or if the identification of the further data packet is different from the identification of the first data packets. Only the selected data packets are retransmitted. A transmitter and software programs embodying the invention are also described.

A method and device for communicating data within a packet frame unit between a terminal and a base station are disclosed. The terminal communicates the packet data to the base station. In response, the base station transmits a channel occupying signal, if the data transmission from the terminal is perceived by the base station. The terminal continues the communication of the packet data, while the channel occupying signal is active, determines whether the base station receives the communicated packet data, and ends the process for communicating the packet data if the base station receives the communicated packet data. If the base station fails to receive the communicated packet data, the terminal is informed through the channel occupying signal. Thereafter, the terminal discontinues its communication and then re-attempts to communicate the packet data from the beginning.

A mobile station includes a radio link control unit for outputting or inputting data that are transmitted or received via a radio channel to or from a higher-level protocol layer, a media access control unit for outputting or inputting the data via a logical channel to or from the radio link control unit, a physical layer control unit for outputting or inputting the data via a transport channel to or from the media access control unit, and for controlling radio communications, and a radio resource control unit for outputting or inputting control data to or from the radio link control unit, media access control unit, and physical layer control unit. The mobile station multiplexes report information therefrom into a channel for packet data transmission so as to transmit it to a base station. The base station carries out assignment of radio resources using the report information.

A method for scheduling packet data transmissions in a wireless communication system is described wherein a priority function is based on a channel state indicator (CSI), the projected average throughput of the users, and a tuning parameter designed to control the throughput and fairness characteristics of the scheduling algorithm. The method also considers fairness criteria dictated by predetermined Quality of Service (QoS) requirements. The channel state indicator may be a Requested Data Rate (RDR) or Carrier-to-Interference ratio (C / I) information. The base station calculates a priority function for the multiple mobile users. Each priority function is a function of the CSI, the projected average throughput of a given mobile user, the average projected throughput over a set of users, and the tuning parameter.

In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay. Data transmission on the forward link is time multiplexed and the base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C / I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets.

A two-way satellite communications system includes an Earth station communicating with a plurality of remote terminals using a network access protocol that facilitates low power consumption by the terminals. The earth station generates forward link TDM packet data transmissions on one or more satellite channels, and detects, despreads and decodes multiple concurrent return link slotted CDMA packet transmissions on one or more satellite channels. It communicates through a wired connection with a packet processing center which ultimately both delivers return link packet data to end-customers and receives forward link packet data from end-customers. The remote terminals receive, process and act upon forward link TDM transmissions on one or more satellite channels, and generate slotted spread spectrum CDMA transmissions on the return link on one or more satellite channels. The remote terminals communicate with a local digital data source and / or sink, digitize one or more local analog sensor signals, enter into a sleep mode to minimize the terminal's power consumption, and access the satellite communications network in accordance with the system network access protocol.

In a wireless communication system a method for combination transmission of packet data and low delay data. In one embodiment a parallel signaling channel provides a message to receivers indicating a target recipient of packet data. The message also identifies the transmission channels used for packet data transmissions. Each receiver may then selectively decode only packets where the message identifies the receiver as a target recipient. The data packets stored in a buffer are ignored if the target recipient is another mobile unit. In one embodiment, the message is sent concurrently with the data packet on a parallel channel. In one embodiment, the message is punctured into the high rate packet data transmission.

A flow control system and method is provided for efficiently transmitting high-speed downlink packet access (HSDPA) packet data between a radio network controller (RNC) and a Node-B in a wideband code division multiple access (WCDMA) system / universal mobile telecommunications system (UMTS).

The present invention relates to a method for transmitting uplink control information in a mobile communication system; and, more particularly, to a method for effectively forming uplink control information transmitted through a downlink from a base station to a terminal in a mobile communication system for providing a packet service and transmitting the uplink control information with minimum radio resources occupied. The method includes the steps of generating uplink control information; allocating the uplink control information to a downlink-shared radio resource for packet data transmission based on downlink scheduling information; and transmitting the radio resource to a terminal. The present invention is applied to a mobile communication system.

A transmission method selection section (223) selects either a first packet transmission method or a second packet transmission method. When the first packet transmission method is selected, an SRQ information generation section (224) generates SRQ (scheduling request) information based on the amount of data calculated by a data amount measuring section (221) and / or the retention time thereof, and the transmission power that can be used for packet data transmission calculated by a transmission power calculation section (222). On the other hand, when the second packet transmission method is selected, the SRQ information generation section (224) does not perform SRQ information generation, or generates SRQ information of a specific value for which packet data transmission is never permitted. By this means, in a radio communication system in which packet transmission is performed on uplinks and the packet transmission method is switched adaptively, the packet transmission method can be reported without transmitting a dedicated signal to a base station apparatus.

A system and method for reliably transmitting a request from a client application (50) running on a client system (13)to a server application (52) running on a server system (15) and receiving a reply to the request, in which functions that provide parameters governing the reliable transport mechanism and message forming and parsing services are provided by the application processes to and called from application-layer protocol stacks (58, 60).

The invention discloses a data transmission method, a data transmission device, a base station and user equipment. The method includes the following steps that: a pre-scheduling signal is sent to the UE (user equipment) before non-authorized carriers are obtained through competition, wherein the pre-scheduling signal is used for instructing the UE to carry out data transmission on the non-authorized resources which are obtained through competition; and data transmission with the UE is carried out according to the pre-scheduling signal. With the data transmission method of the invention adopted, the problems of uncontinuous data transmission and low resource utilization rate which are caused by the limitations of resource competition and resource holding time when non-authorized carriers are adopted to carry out data transmission in the prior art can be solved; limited holding time on the non-authorized carriers can be effectively utilized, spectrum efficiency can be improved, and the time delay effect of the data transmission of the non-authorized carriers can be decreased.

The present invention relates to a method of arranging the transmission of packet data in a system comprising a mobile terminal, a wireless local network and a mobile network. End-to-end service related parameters are signalled via a separate signalling element. A resource authorization identifier is transmitted to the mobile network via the local network. Authorization is requested from the signalling element on the basis of the resource authorization identifier. A tunnel between the mobile terminal and the mobile network is bound to the end-to-end data flow of the mobile terminal on the basis of an authorization from the signalling element and tunnel identification information identifying the tunnel.

A method for establishing a multi-carrier HSDPA channel and method for transmitting multi-carrier downlink packet data are provided. The method for establishing a multi-carrier HSDPA channel includes: A. determining number of HSDPA channel resources of a cell; B. selecting N carriers in the cell according to the number of channel resources determined in step A, wherein the N carriers form the HSDPA channel resources; C. allocating the HSDPA channel resources to be HS-DSCHs, uplink and downlink control channels; D. allocating, by a network, an HS-DSCH to be used by a user terminal, one or more HS-SCCHs and one or more mate HS-SICHs to be monitored by the user terminal, when the user terminal initiates an HSDPA request and the request is allowed. The method may be applied to multi-carrier downlink packet data transmission, to enhance peak transmission rate of user packets, optimize the resources, thereby improving system throughput.

A wireless communication network receives packet data transmissions from a mobile station, tracks the occurrence of retransmission requests sent to the mobile station responsive thereto, and modifies the radio link assignments for the mobile station based at least in part on said tracking. For example, a base station controller may be configured to manage the active set of a mobile station based on the number and / or frequency of NACK messages sent by the radio base stations in the mobile station's active set(s) responsive to packet data transmissions from the mobile station. The ACK / NACK response of a radio base station to mobile station transmissions may be used to detect link imbalance, identify poor reverse link channels, etc. The base station controller can add or change radio links based on the ACK / NACK response to improve reverse link performance, trigger voice call handoff, correct link imbalance, etc.

An apparatus and a method for managing resources for efficient packet data transmission. More specifically, there is provided a method for allocating transmission resources in a base station comprising determining a largest supportable packet size for a highest priority user, wherein the determination is based at least partially on the available modulation types, a total number of codes available for packet transmission, a total amount of available transmission power available for packet transmission, and frame durations supported by a base station.

In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay. Data transmission on the forward link is time multiplexed and the base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C / I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets.

A hybrid test bed mixes simulated and actual wireless communication network entities in a real-time packet data simulation. In at least one embodiment, the test bed supports end-to-end simulation for a packet data application running on a mobile station simulator. The test bed provides a realistic assessment of that application's real-time performance by constraining packet data transmissions from a radio base station simulator to the mobile station simulator according to peak data throughput estimates and mobility event processing determined from a detailed wireless communication network simulation. Additionally, the test bed includes or is associated with a graphical display system providing real-time performance information.

The invention relates to a HARQ method using incremental redundancy and providing synchronous retransmissions. Further, the invention relates to a receiving entity and a transmitting entity employing the HARQ method and to a mobile communication system. To optimize conventional HARQ retransmission protocols, the invention introduces a ternary feedback which allows requesting a self-decodable version of a data packet under certain conditions. Further, the ternary feedback is provided in a backward compatible manner using a combination of conventional HARQ feedback signaling and scheduling related control signaling.