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3447 results about "Transmission delay" patented technology

In a network based on packet switching, transmission delay (or store-and-forward delay, also known as packetization delay) is the amount of time required to push all the packet's bits into the wire. In other words, this is the delay caused by the data-rate of the link. Transmission delay is a function of the packet's length and has nothing to do with the distance between the two nodes. This delay is proportional to the packet's length in bits, It is given by the following formula: DT=N/R seconds where DT is the transmission delay in seconds N is the number of bits, and R is the rate of transmission (say in bits per second) Most packet switched networks use store-and-forward transmission at the input of the link.

Mechanisms for avoiding problems associated with network address protocol translation

Disclosed are methods and apparatus for avoiding problems caused by converting between two different protocols, such as IPv4 and IPv6. These problems may include, but are not limited to, fragmentation of packets, dropping of packets, and retransmission of packets. Avoiding these problems will reduce the incidence of transmission delays, bandwidth degradation, and additional processing in the packet's transmission path due to such problems. In general terms, the present invention provides mechanisms for modifying a protocol parameter, such as a TCP or UDP parameter, to avoid problems associated with protocol translation, such as fragmentation. In one implementation, the protocol parameter limits the size of a particular portion of the a packet transmitted by a sending computer node or device. For example, a packet size indicator is communicated to the sending computer node so that the sending computer node sends packets limited by the packet size indicator to thereby avoid associated with the size of such packets. In specific TCP embodiments, the size indicator specifies a window size and/or a maximum segment size. For example, if packets transmitted by a sending node to a receiving node are converted from IPv4 to IPv6 and the window size indicated to the sending node (e.g., by the receiving node) is 512 bytes, the window size is adjusted to 500 bytes before reaching the sending node. The adjustment amount may be based on an estimated size increase resulting from converting from IPv4 to IPv6. In this example, the window size is decreased by 12 bytes since a conversion from IPv4 to IPv6 where one 4 byte IPv4 address is changed to a 16 byte Ipv6 address has an associated size difference of 12 bytes. In a specific embodiment, actual changes in packet size may tracked and the adjusted size indicator may be dynamically based on such tracked changes. In other embodiments, the changes in packet size are predicted, and the adjusted size is preemptively changed as needed.

Method and apparatus for deriving uplink timing from asynchronous traffic across multiple transport streams

A communication apparatus that shares precise return channel uplink timing information includes a common symbol timing reference and one or more control stations that each transmit independent asynchronous DVB data streams which evenly share the common symbol timing. The control stations each include respective delay trackers to determine broadcast transmission delays associated with the particular control station and transmission path. Each broadcast data stream includes the same non real-time frame marker and a transmission delay message particular to the respective control station. A remote receiver receives one of the broadcast streams and timestamps the non real-time frame marker with a local time of receipt. A timing recovery circuit determines an upcoming return channel frame start time by adjusting the local time of receipt by the particular broadcast transmission delay and a unique receiver offset time. A local transmitter subsequently uplinks a TDMA message in a predetermined time-slot after the return channel frame start time. The method for transmitting a frame synchronized message includes receiving a non real-time frame reference marker in a receiver, timestamping the received frame reference marker with a reception time, and subsequently receiving a control node timing differential at the receiver. The local reception time of the non real-time frame marker is corrected to determine the proper return channel frame transmit start time by applying the control node timing differential and the local offset time. Users then uplink a message during an assigned period after the return channel frame transmit start time.

HARQ (Hybrid Automatic Repeat Request) signal transmitting method and device and receiving method and device based on polar codes

The embodiment of the invention provides an HARQ (Hybrid Automatic Repeat Request) signal transmitting method and device and receiving method and device based on polar codes. When transmitting is carried out at a time, when it is judged that there are surplus data blocks, one data block is selected out from the surplus data blocks as an initial transmitting information sequence; the combination of first sub-sequences and second sub-sequences corresponding to negative acknowledge signals in a first retransmitting control queue is determined as a retransmitting information sequence, wherein the first sub-sequences and the second sub-sequences are stored in a transmitting cache queue; the initial transmitting information sequence and the retransmitting information sequence are determined as to-be-transmitted information sequences; one first sub-sequence of the determined to-be-transmitted information sequences is stored in the transmitting cache sequence; polar coding is carried out to the to-be-transmitted information sequences; and the to-be-transmitted information sequences are transmitted. The accurate decoding probability of the information sequences failed to be transmitted for former M times is improved; therefore, the throughput of the communication system is improved; the average transmitting and receiving times before the accurate decoding is carried out to the to-be-transmitted information sequences is reduced; and therefore, the transmission delay of the communication is reduced.

Mobile station and communications method

In order to define uniquely a transmission control operation of a mobile station in accordance with the present invention at the time of a E-DCH transmission and to increase the efficiency of the operation of a communications system, the mobile station includes a transmission control means for, for each of a first physical data channel via which user data transmitted via a transport channel from an upper layer are transmitted to a fixed station and a second physical data channel which is an extension of the first physical data channel, selecting transmission control information including a transmission rate depending upon the user data, a multiplex modulation means for performing multiplex modulation on transmission data by using the transmission control information selected by the transmission control means and the amplitude coefficients of the first physical data channel and the second physical data channel, and a transmit power control means for performing control of the transmit power of a transmitting means which amplifies the transmission data in such a manner that the transmission data has predetermined transmit power, and which transmits the transmission data, and the transmission control means judges whether the transmit power in a case of not transmitting a control channel via which control data about control of the second physical data channel are transmitted exceeds a maximum transmit power value, and selects the transmission control information about the first physical data channel.

Transmission method and transmission device for feedback information

The embodiment of the invention provides a transmission method for feedback information, which comprises the following steps that: a base station sets control signaling VDAIDL for downlink control information carried by user equipment (UE) in physical downlink control channels (PDCCH) of all scheduling physical downlink share channels (PDSCH) or/and PDCCHs indicating semi-persistent scheduling (SPS) resource release in a feedback window, allocates a control information modulation and coding scheme (MCS) offset value beta offset HARQ-ACK to the UE in a semi-static state and informs the UE of the offset value through high-level signaling; and the base station receives acknowledgement/negative acknowledgement (ACK/NACK) feedback information sent by the UE through a physical uplink share channel (PUSCH) according to VDAIDL and the beta offset HARQ-ACK and performing corresponding processing. According to the scheme provided by the invention, a method for ACK/NACK multiplexing of a long term evolution time division duplex (LTE TDD) system can be expanded, so that the method for the feedback information can be applied to LTE/LTE-A, and the problem of multiple ACK/NACK feedbacks caused by carrier aggregation can be solved simultaneously. In addition, in the scheme provided by the invention, the change of the conventional system is small, the compatibility of the system cannot be influenced, and the scheme is simply and efficiently realized.

Method and apparatus for multi-antenna signal transmission in rf long-distance wireless bs

The invention relates to a method for transmitting a plurality of antenna signals in a wireless Base Transceiver Station (BTS) using Remote Radio Head (RRH) technology and the corresponding system. The method includes the steps of: transmitting signals over the transmit channel using Synchronous Digital Hierarchy (SDH)/Optical Transmission Network (OTN), multiplexing the plurality of antenna signals adopting the manners of time division multiplex or GFP frame-level multiplex; forming the multiplexed antenna signal stream and in-band control signaling stream into Generic Framing Procedure (GFP) frame; or forming the plurality of antenna signals and the plurality of respective control signals on the in-band control signaling channel into a plurality of respective GFP frames in parallel; and further mapping the GFP frames to STM-N/OTM-n frames, therefore multiplexing the plurality of antenna signals and the in-band control signaling stream to realize the SDH/OTN-based transmission. According to the invention, in the circumstance of using a plurality of antennas for transmitting signals, the strict time and phase relations between various antenna signals can be ensured, and also system complexity can be simplified, the transmission delays from various antenna signals to CBTS are totally the same.

Data verification method based on block chains and data verification system thereof

The invention discloses a data verification method based on block chains and a data verification system thereof. The data verification method comprises the steps that the sensing data of the environment and/or household equipment state are acquired through multiple wireless sensor nodes of a wireless sensor network and processed and then uploaded to a data repeater; the data repeater receives the processed sensing data and then forwards the sensing data to a data verification network; multiple data verification nodes in the data verification network are responsible for verifying and saving the sensing data; and all the data verification nodes are block chain nodes, and multiple data verification nodes form a distributed database. The data verification task is completed by using the data verification nodes, and the verification work is distributed to the verification nodes from the data repeater so that the problems of being low in verification efficiency, low in speed, high in transmission delay and vulnerable because of the excessively centralized verification task can be overcome, and the nodes are excited to actively authenticate the data and rapidly complete the verification task so that the whole verification system is not influenced by single node failure of any node.
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