118 results about "Transmission throughput" patented technology

A method and an apparatus select an access point (AP) in a wireless LAN to associate or reassociate, based on considerations that take into account the quality-of-service (QoS) status of the stations (STAs) and the potential hidden terminal effect. The method utilizes advertised or requested information obtained from an AP which includes the QoS status in each basic service set (BSS) and estimates the potential hidden terminal (HT) effect based on local channel sensing by the STA. The method selects the AP in a manner that reduces the possibility of collision from equal and higher priority HTs, thus providing greater transmission throughput and improving performance.

Mechanism for extended service channel (SCH) access on demand to improve throughput in an alternating channel access of multiple channels in a wireless environment is provided. Due to characteristics of alternating access to a control channel and a service channel and repeating to broadcast service advertisement packets in IEEE 1609 standards, the disclosure may improve the utilization efficiency of the channels and then increase the transmission throughput.

A method and apparatus is disclosed whereby the scheduling of network transmissions in a wireless backhaul network is determined using a cross-layer optimization algorithm. In a first embodiment, the algorithm assumes a good MAC layer transmit schedule has been provided and computes optimal network layer routes as well as transmit beam patterns and transmit powers in a semi-distributed manner. According to this embodiment, the optimization goal is the throughput from each access point, or node in the network, to the core network. In another embodiment, an independent set of transmitting nodes is determined at the MAC layer in a way such that no link in the set interferes with another link and no link is scheduled to transmit and receive at the same time. According to this embodiment, a column generation algorithm is used to find a maximal weighted independent set and to achieve optimal network transmission throughput.

Significant improvement in Raptor codes and punctured LDPC codes are obtainable by use of the invention. In both a transmission scheme for Raptor-encoded or LDPC-encoded information, a dynamic adjustment approach is employed. A fraction of a codeword or information frame is transmitted. A feedback signal is sent from the receiver to the transmitter indicating either 1) successful decoding, or 2) failure to decode and/or a feedback signal indicative of a statistical measure of transmission channel quality. If decoding fails, a further portion of the codeword or frame is sent. The intensity and/or size of the fraction is adjusted based on the feedback signal. In one embodiment, a specific range for probabilities employed in the encoding process for Raptor codes provides the ability to increase transmission throughput. Further it has been found that the advantageous Raptor codes are useful in noise conditions where even the improved punctured LDPC codes of the invention begin to degrade.

Wireless communication system and wireless communication method using a wireless channel. A transmitting device changes one of a data bitrate of a video signal and an actual transmission rate of the video signal based on a determination of a maximum transmission throughput of the wireless channel and transmits the video signal over the wireless channel according to the change in the data bitrate or the change in the actual transmission rate. A receiving device receives, temporarily stores, and decodes the video signal transmitted over the wireless channel. Thus, the wireless communication system is capable of maintaining a continuous video display when a discontinuous video signal is transmitted over the wireless channel.

A mixed congestion control method based on packet loss and time delay comprehensively gives consideration to network packet loss and time delay information and conducts mixed mode control on congestion windows. Adjustment of the congestion windows is based on improvement of Fast congestion control in a fast mode. In a slow mode, a current network steady state window value is calculated according to network states at round-trip time interval, and then congestion control strategies based on CUBIC improvement is carried out. The mixed congestion control method comprehensively uses congestion control superiorities based on the time delay and the packet loss and adopts a mixed strategy to conduct congestion control, and a congestion window adjustment mode combining the two modes guarantees that the congestion windows rapidly achieve and continuously maintain a network steady state value. An improved congestion control algorithm can rapidly and effectively adjust the congestion control windows on a transport layer under high bandwidth, improve transmission throughput rate of a network flow and simultaneously guarantee a network to be stable.

The invention proposes a sound quality adjustment method and system, a main unit end and a storage medium. The method comprises the steps: obtaining a code rate range of wireless audio equipment when the main unit end and the wireless audio equipment build wireless communication connection; presetting a first code rate of the main unit end according to the code rate range and the current signal intensity of the wireless communication connection; controlling the main unit end so transmit audio data to the wireless audio equipment at the first code rate; judging whether to carry out the matching with the current wireless transmission quality or not through obtaining the transmission throughput capacity of audio data fed back by the wireless audio equipment, respectively judging results and adjusting the first code rate, thereby adjusting the sound quality when the audio data is played at the wireless audio equipment, avoiding play jamming caused by poorer wireless transmission quality, and improving the audio play fluency of the wireless audio equipment.

The invention provides a band dynamic selecting and time scheduling method in a heterogeneous network, relating to a method and equipment for dynamically selecting usable frequency resources in a plurality of main system bands in a heterogeneous network system based on the cognitive technology, in particular to a method and equipment used for opportunity spectrum access, frequency resource efficient utilization, and combination of heterogeneous network resource amalgamation and user business service quality (QoS) assurance. The invention has the band dynamic selecting method as follows: firstly, aiming to different main system characteristics, an average main system user detection threshold of each main system of a base station CBS accessory is defined and cognized, and the threshold is an average value of the prior detection threshold in a wireless network transmission environment; secondly, according to the average main system user detection threshold and the throughput needs of a secondary system user, scanning efficient time of CBS to each main system is defined; thirdly, the CBS selects the optimal main system band from a usable band list according to a request of a user, the wireless transmission characteristics and a channel state of a band channel are the basis for selecting the optimal band, and interruption of the equipment CPE transmission throughput is preset according to the user.

A method to detect a lost status report determines that a second status report is required when an AMD PDU not negatively acknowledged in the first status report, an AMD PDU with a polling bit set, or the last negatively acknowledged AMD PDU is received after the expiry of a roundtrip timer and before all the negatively acknowledged AMD PDUs in the first status report are received. The method provides a deterministic way of detecting a lost status report, resulting in improved transmission throughput in a wireless communications system.

A system and method in various embodiments implements a virtual spectrum band stacking technique facilitating spectrum sharing by converting and combining spectrum bands consisting of several different RF channels, common air interfaces, and radio channel protocols in the radio frequency channel domain to form IP Virtual Radio Channels (IP-VRCs) in the packet data domain. This virtual spectrum stacking technique combines the transmissions of contiguous and non-contiguous RF channels with differing physical layers into IP-VRCs. This technique enables simultaneous parallel high-speed wireless transmission; virtual radio channel hopping for enhanced security; and customized security schemes for different IP-VRC Groups. The deployment of the combination of IP-VRC Groups; Universal “Small Cell” Base Stations; and Universal Wireless End-Point Devices allows the aggregation of all available spectrum bands for use within a building environment. Some benefits of this deployment include expansion of spectrum utilization, service quality, security, applications and transmission throughput for wireless end-point devices.

The invention discloses a multi-path parallel-transmitted data scheduling method and a transmission control protocol. The characteristics are that a dynamic value cwnd[r] of a congestion window is adjusted according to the following mode: when a path r successfully receives an ACK, the cwnd[r] of the congestion window increases by alpha/cwnd[total]; when the path r detects that a grouped packet is lost, the cwnd[r] of the congestion window decreases by max(beta*cwnd[r], cwnd[r]/2). The multi-path parallel-transmitted data scheduling method based on congestion window dynamic adjusting of the invention gives full consideration to influences by link delayed differentiation to transmission quality; path delay factor parameters are introduced in a congestion window control mechanism so as to realize effective reduction of path transmission quality differentiation and avoid excessive congestion of the optimal link, thereby improving the MPTCP transmission throughput and improving user experience.

To provide inter-LSI data synchronized transfer with a transfer throughput satisfying a required performance without causing an operation timing difference of the entire system even when a wiring delay between LSIs varies on an evaluation board and an actual device. A master (LSI1) outputs transfer data and a transfer synchronization clock signal to a slave (LSI2). For the edge of a clock signal used for data output at the master (LSI1), the slave (LSI2) latches input data by using a reverse edge. Moreover, upon data transfer from the slave (LSI2) to the master (LSI1), the master (LSI1) selects a latch timing of input data from a plurality of timings so that the transfer time to an internal circuit of the master (LSI1) side is identical regardless of which latch timing is selected.

The invention relates to a local micro server and a vehicle-mounted service system and method based on the local micro server. The vehicle-mounted service system is a local micro server mounted on a vehicle and having calculation and wireless communication functions, a WiFi network card of the local micro server is utilized to set up a high-speed wireless local area network (WLAN), customized localization service information is provided to a passenger through the WLAN, and the passenger can access the abovementioned vehicle-mounted WLAN by using an intelligent mobile terminal such as a smartphone and a tablet PC, thereby using various services. Information provided by the system is all related with hotels, malls, restaurants and tourist attractions in the periphery of a vehicle travel route, the process of querying information by the passenger is simplified, and accuracy of information is improved; and all service information is cached locally, thereby effectively reducing communication cost and improving a transmission throughput rate, supporting relatively abundant information and entertainment service categories, and particularly supporting a high definition multimedia on-demand service.

The invention discloses to a method for fetching high speed downlink packet access (HSDPA) transmission throughput, which is used for solving the problems that network simulation to a wireless networksystem after HSDPA technology is brought in is complex and the fetched HSDPA transmission throughput is inaccurate in the prior art. The method is that: Firstly, fetch pilot signal quality of each HSDPA user in at least one HSDPA user according to fetched location information of at least one high speed downlink packet access HSDPA user in a planning area, then select HSDPA users with set amount in each district as scheduling HSDPA users to transfer data according to the pilot signal quality of each HSDPA user by a set scheduling policy, finally, determine HSDPA transmission throughput in thedistrict according to the location information of each scheduling HSDPA user in each district. The invention also discloses a network simulation system for fetching HSDPA transmission throughput.

The invention provides a forward retransmission method applicable to a network coding transmission control protocol. The method comprises steps: a transmitting end numbers a coding packet and a numberfield Pid is attached to the header of the coding packet; the transmitting end records which original packets to form each coding packet, a receiving end needs to reply an ACK packet for each received coding packet, and a field Pid-reply is attached to the replied confirmation packet; according to the Pid-reply, a network coding layer confirmation number and the original data packet information forming the coding packet, the transmitting end indirectly acquires a lost link packet, and a linked list for a retransmission packet is maintained; and when the network coding layer at the transmitting end receives a retransmission packet from an upper TCP, a forward retransmission mechanism is started and a packet in the retransmission linked list is retransmitted. Thus, a protocol based on the network coding transmission control protocol can retransmit all lost packets in a round-trip delay, and the transmission throughput rate based on the network coding transmission control protocol is improved.

A method and system for measuring the throughput of transmissions over a wireless local area network having a station and an access point. The station can send messages to the access point during a test period, where the messages can be sent as data frames. The access point can receive messages sent from the station during the test period. For messages received by the access point, the access point can send acknowledgements to the station, where the acknowledgements can be sent as control frames. The station can receive acknowledgements from the access point for messages received by the access point. The station can determine a throughput from the station to the access point for the test period based on the acknowledgements received at the station from the access point during the test period.

The embodiment of the invention discloses a data transmission method. The method comprises that when a first device needs to transmit business data, a first wireless carrier and a second wireless carrier connected and associated with a prebuilt public data network PDN are determined; wherein the first wireless carrier is composed of a first relay carrier between the first device and a piece of relay user equipment, and a second relay carrier between the relay user equipment and a second device; the second wireless carrier is composed of a Uu carrier between the first device and the second device; the first device receives first target business streams from the second device through the first wireless carrier and the second wireless carrier; and or the first device sends second target business streams to the second device through the first wireless carrier and the second wireless carrier. Correspondingly, the embodiment of the invention also discloses a device. Through adoption of the method and the device provided by the invention, the transmission throughput capacity and reliability can be improved.