353results about How to "Avoid retransmission" patented technology

A random access scheme for preventing unnecessary retransmission and a user equipment for the same are disclosed. If a Contention Resolution (CR) timer expires in contention resolution during a random access procedure or if a Physical Downlink Control Channel (PDCCH) signal or a Physical Downlink Shared Channel (PDSCH) signal associated with the PDCCH signal does not match an identifier of a terminal, a Hybrid Automatic Repeat Request (HARQ) buffer for storing a Medium Access Control Packet Data Unit (MAC PDU) transmitted in the random access procedure is flushed such that unnecessary data retransmission can be prevented.

The present disclosure is related to detecting a start frame delimiter. A received data packet is correlated with a known sequence, which provides a first correlation result. The received data packet is correlated with a predefined sequence, which yields at least a second correlation result. The data packet comprises at least a preamble portion and a header portion, whereby the preamble portion comprises the start frame delimiter. The predefined sequence is determined according to the preamble pattern. The method further comprises of comparing the first correlation result with the second correlation result and comparing the first correlation result with a given threshold. The process of correlating will be continued until two criteria are met: the first correlation result is larger than the threshold and larger than the at least second correlation result. Only then it is decided that the start of frame delimiter pattern has been detected.

This invention discloses a method for realizing synchronization of HARQ of the TDD system and a data transmission method to correspond the HARQ progress with the time slot number in a sub-frame to realize synchronizing HARQ, if re-transmission is needed, then transmission is done in the time slot of the same number of the succeeded sub-frames, and the re-transmitted time slot is the same with the last one in the direction of up and down lines, which avoids the delay of re-transmission caused by disagreed time slots and increses transmission efficiency of the TDD system.

A method for preventing a transmission delay of data packets transmitted through an uplink due to a transmission gap (TG) period occurring when a user equipment (UE) performs handover from a Node B to its neighbor Node B in a mobile communication system. In the method, the Node B sequentially transmits data packets to the UE through a plurality of subframes, and the UE transmits response signals for the data packets transmission-delayed for the TG period to the Node B through a subframe of an uplink dedicated physical control channel (DPCCH), following the TG period.

A data transmission apparatus for relaying data transmitted from the transmitting end in units of packets, each packet having additional information relating to its sequence number, priority and data reproduction time, comprises: a receiving unit for receiving packets transmitted from the transmitting end; a priority decision unit for deciding the priority of each of the received packets; a retransmission packet storage unit for storing packets the priorities of which are equal to or higher than a predetermined value, as retransmission packets, on the basis of the priority of each packet decided by the priority decision unit; a retransmission instruction receiving unit for receiving a retransmission request from a terminal at the receiving end; a retransmission decision unit for deciding whether retransmission of the packet for which the retransmission request has been made should be performed or not, on the basis of the retransmission request and the storage status of the retransmission packets in the retransmission packet storage unit a transmission queue management unit for setting the transmission order of the received packets and the packets which have been decided as packets to be retransmitted, on the basis of additional information which is given to each packet; and a transmission unit for transmitting the data of these packets in the transmission order set by the management unit. Therefore, the transmission quality in a radio section in real-time transmission is improved and, further, the number of retransmission times is reduced.

An interleaving and deinterleaving apparatus and method in a wireless communication system are provided, in which it is determined whether coded bits to be transmitted in one modulation symbol are selected from a plurality of code blocks. The coded bits are interleaved on a modulation symbol basis if the coded bits to be transmitted in the modulation symbol are selected from a plurality of code blocks.

The invention discloses an uplink control signaling transmission method and user equipment, and relates to the field of digital communication. The method comprises the following steps of: receiving a physical downlink shared channel borne on a downlink component carrier through the user equipment, grouping all downlink component carriers required to feed back answer message according to the grouping information of the downlink component carrier appointed by the user equipment and a base station, and determining answers corresponding to each downlink component carrier group; and when the user equipment feeds back the answer message to the base station, sending answer information consisting of the determined answers corresponding to each downlink component carrier group and other uplink control signaling in the same uplink component carrier, wherein the other uplink control signaling is SR or CSI. The technical scheme of the invention avoids unnecessary retransmission so as to effectively improve the throughput of a system.

The present invention discloses a system, device and method for realizing database data migration under a heterogeneous platform, wherein the system includes a source-end database, a data migration device and a target-end database connected in sequence, wherein: the source-end database changes the data of each application business Recorded in the log stream; the data migration device captures the changed data of the application business from the log stream recorded in the source database, converts the changed data together with the corresponding application business into a standard database query statement through corresponding interpretation, and Pass it to the target-side database; the target-side database completes data synchronization with the source-side database by executing standard database query statements. The invention solves the problem of database description syntax differences between different databases such as business triggering and data storage, and ensures the data consistency between the source end and the target end.

An apparatus for retransmitting data using hybrid automatic retransmission request (HARQ) in a mobile communication system. A radio network controller (RNC) determines maximum waiting time for retransmission of the data, and transmits the determined maximum waiting time to a Node B and a user equipment (UE). The Node B (a) receives the maximum waiting time and transmitting the data to the UE; (b) upon detecting a retransmission request for the data from the UE, retransmits the data and sets the maximum waiting time; and (c) upon detecting a second retransmission request for the data due to abnormal receipt of the retransmitted data from the UE after a lapse of the maximum waiting time, prevents retransmission of the data. The UE (a) receives the maximum waiting time; (b) if an error exists in data received from the Node B, transmits a retransmission request for the data to the Node B and sets the maximum waiting time; and (c) waits for the retransmitted data only for the maximum waiting time.

The invention discloses a roaming switching and trigger method, an access control (AC) and an access point (AP), wherein the method comprises: the present AP of a mobile terminal access and signal quality information of a mobile terminal detected by the target AP are acquired; the difference value of which the signal quality of the mobile terminal detected by the present AP is lower than that detected by the target AP is judged to reach the set threshold value or not, if the difference value reaches the set threshold value, the mobile terminal is triggered to switch to target AP. The method of the invention ensures the service quality of users and increases the utilization rate of wireless broad band.

The invention discloses a method for carrier distribution in high-speed descending chain group access technique, comprising that a base station NodeB selects carrier from a carrier group distributed for a user device UE, and distributes the carrier meeting preset condition to the UE. The invention also discloses a relative device.

The invention relates to the communication field and discloses a method and device for feeding back ACK/NACK (Acknowledgement/Negative Acknowledgement) information, which is used for improving the system performance of an LTE-A (Long Term Evolution-Advanced) system. By combining the characteristic that the LTE-A system can use the carrier aggregation technology, the method redesigns a mapping relationship between ACK/NACK information and ACK/NACK feedback bits, and the ACK/NACK feedback bits are used for indicating the number of downlink subframes correctly received by UE (User Equipment) rather than the number of data packets correctly received. Thus, the invention can accurately reflect the receiving situations of multiple downlink subframes in multiple downlink carriers based on the limited K-bit ACK/NACK feedback bits when the ACK/NACK feedback information and other uplink feedback information are simultaneously transmitted through a PUCCH (Physical Uplink Control Channel), and can minimize the mistaken judgments of a base station on data receiving situations of user terminals caused by the many-to-one mapping of the ACK/NACK feedback bits so as to avoid unnecessary retransmission, thereby improving the transmission performance of the system.

A method and system for packet communication in a wireless system, implementing a process for aggregating multiple data units into a single aggregated frame, transported as payload in a carrier frame having a header, and separately protecting said header and payload with error recovery information for transmission over a wireless channel. The process further includes transmitting the carrier frame from a sender to a receiver over a wireless channel, using the error recovery information to detect if a data unit in the payload was received in error, and informing the sender to selectively retransmit a correct copy of the data unit received in error.

Disclosed is a system and method for transmitting and receiving hybrid automatic repeat request (HARQ) buffer capability information in a broadband wireless access communication system. According to the system and method, a mobile station detects its own HARQ buffer capacity, and transmits a message including information about the detected HARQ buffer capability to a base station. The base station receives the message and determines the amount of a transmission signal to be allocated to the mobile station based on the HARQ buffer capability, so that it is possible to operate a HARQ scheme in accordance with the HARQ buffer capability of the mobile station.

A method controlling wireless communication of a data block from a terminal device to a base station includes: making a first uplink data transmission for the data block in association with a first retransmission protocol process and obtaining a corresponding first acknowledgement indication indicating whether the data block has been successfully communicated to the base station; making a second uplink data transmission for the data block in association with a second retransmission protocol process and obtaining a corresponding second acknowledgement indication, the second transmission initiated before the first acknowledgement indication is obtained; determining whether to avoid scheduling a data retransmission in association with the first retransmission protocol process based on the first and second response signallings, avoiding retransmission of data in association with the first retransmission protocol process if either one of the first or second acknowledgement indication indicates the data block has been successfully communicated to the base station.

Data which is transmitted over the internet or other transmission networks is first divided up into individual information packets, transmitted and then reassembled into useful data after reception. Parity packets are included in with the information packets in the transmission of data in order to enable the regeneration of any information packets which were lost or damaged during transmission. The grouping of information packets and parity packets derived therefrom is termed a chunk. Chunk arrangements to recover from all cases of single and double lost packets are disclosed. Bursts of lost packets are recovered by interleaving the transmission of packets from different chunks. If the recovery is not successful then retransmission occurs in a manner similar to TCP.

An embodiment of the invention discloses a data transmission method and a base station. The method comprises the following steps: when a second time frequency resource contained in a first time frequency resource distributed to a first terminal is distributed to a second terminal by the base station, first indication information, second indication information and a third transmission block are sent to the first terminal by the base station; the first time frequency resource is used for transmitting a first transmission block of the first terminal, the second time frequency resource is used for transmitting a second transmission block of the second terminal, the first indication information is used for indicating a position of the second first time frequency resource occupied by the second transmission block, or the first indication information is used for indicating data, planned to be transmitted on the second time frequency resource, of the first transmission block, a code block to which the data belongs or a code block group to which the data belongs; the second indication information is used for indicating a position of a third time frequency resource distributed to the third transmission block by the base station; the third transmission block comprises data, planned to be sent on the second time frequency resource, of the first transmission block. Via adoption of the data transmission method and the base station, efficiency of data transmission can be improved.

The system comprises several network devices. One of the network devices is appointed as a network topology collection device for initiating the topology collection request; other network devices are used to send their topology information to the network topology collection device by way of topology collection response; when a network device change its topology information, it triggers a relevant topology collection renew message, and the network topology collection device renews the relevant network topology information according to said topology collection response and topology collection renew message.

The invention discloses a method, a system and a device for transmitting data, which belong to the field of communication. The method comprises the following steps: loading data pockets transmitted by a radio network controller RNC to at least two carrier frequencies for transmitting and respectively carrying out backup save on the data pockets loaded on the carrier frequencies in a preset buffer by a base station; obtaining the transmitting status of the data pockets; and deleting the data pockets which are transmitted correctly and backup saved in the buffer according to the transmitting status, and loading the backup data pockets which are transmitted incorrectly and backup saved in the buffer to another carrier frequency for transmitting. The system comprises the radio network controller RNC and the base station. The preset buffer is arranged on the base station NodeB to carry out buffer and backup on the received data pockets, and the data pockets are directly acquired from the buffer of the base station when the data pockets need retransmitting so as to decrease the flow impact to the RNC and the NodeB caused by an Iub interface and avoid unnecessary retransmission of an RLC layer.

This invention discloses a method for re-transmitting data, in which, when the sending end segments a protocol data unit in terms of the transmission format of the physical layer, it registers the ID of the segment blocks in the segment attribute domain added for the segment blocks, which can identify a block effectively in all the blocks stored in the local end, the receiving end receives the physical frame and carries the segment block ID of the blocks in the physical frame in the receiving confirming information fed back to the sending end and when the sending end decides that the receiving end does not receive the blocks correctly, it picks up the corresponding blocks from the stored blocks and re-transmits them. This invention also discloses a data transmission device.

Apparatus, and an associated method, for facilitating performance of location services for a mobile station that roams beyond its home network. A cache is provided at the mobile station. The cache is populated with a value identifying the address of the serving position server. When a location service is requested, the cache is accessed, and a message is sent to the address identified in the cache. The cache is updatable, such as through the generation and forwarding of a message to the mobile station by the home position server responsive to registration of the mobile station.

The embodiment of the invention provides a method and base station for determining non-detection of down link control information. The method comprises that: a receiving terminal sends data through a physical uplink shared channel (PUSCH), and the data is demodulated, so a demodulation result is obtained; and if the signal quality threshold value of the demodulation result is smaller than a preset lowest threshold value, the terminal is determined that the down link control information is not detected. The base station comprises a processing module and a determining module. The scheme provided by the embodiment of the invention can effectively detect the non-detection of DCI0 at UE side, so caused by non-detection are avoided, and the spectral efficiency of the base station is improved.

The invention discloses a data processing method and device, a server and a computer readable storage medium. The data processing method comprises steps of receiving data processing requests forwardedby an access layer through multiple configured links in parallel, wherein the data processing requests are sent to the access layer simultaneously through at least one data source; for each link, performing deduplication processing on data in the received data processing request; performing business logic processing on data undergone deduplication processing on each link through a data middlewareproviding a data association inquiry service for business logic processing, wherein one data middleware is mounted on one link, and data middlewares mounted on different links are synchronized; and combining data undergone business logic processing on each link, and performing deduplication processing on combined data. In the prior art, consideration cannot be given to both real-time performanceand reliability in data transmission and processing. The method solves the above problem.