2776 results about "Communication quality" patented technology

From an electric pole outside to a cordless handset inside a building/facility, a communication line is established via an electric power line. At this point, it is judged whether or not electric power line communication is possible, and if electric power line communication is possible, the communication line between the cordless handset and a base unit is switched to an electric power line communication system, and a communication line is formed via an optical fiber cable from the electric power line. By measuring the communication quality levels of all lines of the wireless and electric power lines, the communication line having the highest communication quality level may be selected.

The present invention pertains to improved communication quality and security of transmission in cellular communication networks. A customer has the option to pay different fees for different tiers of service relating to voice quality, bandwidth access, and different tiers of service relating to communications security. Higher tiers may guarantee a specific vocoder or bit rate is used, or guarantee a specific encryption protocol is use to ensure secure communications. Different tiers may be associated with customers' records for billing purposes. The network may afford high end devices higher voice quality and/or security via a lookup table indicating what level of service is associated with a given device. Calling or receiving devices may negotiate with each other to change to a more robust vocoder or bit rate to ensure a higher quality and/or security. Furthermore, the user may opt to change the quality and/or security level before or during a call.

A QoS routing apparatus as a node of a logical network to transmit data communicated between user's terminals comprises a relay unit discriminating whether or not flows of received data are measurement flows and transmitting said received data, a quality measurement unit measuring communication quality of links connected the own apparatus using the measurement flows, a quality accuracy setting unit determining measurement accuracy of the communication qualities of the respective links and a path setting unit prescribing transmission amounts of the measurement flows to the respective links. When the path setting unit prescribes the transmission amounts of the measurement flows, it applies a higher rate to a link which has been determined a lower measurement accuracy.

A process, system, and apparatus are disclosed for mitigating access point data rate degradation with respect to a wireless communication between a wireless access point and a wireless client device. A channel assessment module is configured to assess the wireless communications, including interference signals, present on available wireless communications channels. The channel assessment module may establish quality parameters that at least partially describe the wireless communications quality of a given channel. A channel selection module is configured to select a best wireless communications channel based on the communications channel assessment. A channel connection module is configured to facilitate wireless communication between the wireless access point and the wireless client device on the best wireless communications channel.

A visible ray communication system and method that improve transmission rate and remove an influence of inter-color interference to improve the communication quality. A transmission apparatus included in the visible ray communication system allocates each carrier signal component of an OFDM signal, which is modulated into transmission information, to a plurality of LEDs of different colors. The information is added to a combination of a carrier frequency and an LED wavelength, when a carrier signal is allocated to an, in addition to each carrier signal being modulated into the information.

A multiple mode RF communication device (100), such as a transmitter, receiver or transceiver, has a first RF communication resource (102, 122) that communicates by default using a first communication mode. A second RF communication resource (104, 124) communicates by default using a second communication mode. A system manager (110) deploys the first and second communication resources according to a set of deployment rules, wherein the deployment rules may be dependent upon a communication quality parameter, priorities, availability of the first and second communication resources as well as other parameters.

An average signal point amplitude detection section 15A determines an average position of I and Q components when a received QPSK modulated signal is demodulated and a threshold calculation section 15B determines threshold ths on an IQ plane based on the average signal point position of the received QPSK modulated signal and a theoretical distribution position on the IQ plane of signal points of a 16-value QAM signal. Then, a threshold decision section 14A makes a threshold-decision on the I and Q components of sequentially received QPSK modulated signals using this threshold ths and thereby calculates a simulated bit error rate of the 16-value QAM signal.

Of the antenna group composed of multiple ones of the transmission antennas and multiple ones of the reception antennas, the present method selects an antenna group which satisfies a first criterion relating to communication quality. Out of combinations of transmission antennas and reception antennas included in the selected antenna group, combinations which satisfy a second criterion relating to communication quality are selected. Using a part of or all of the selected combinations of transmission antennas and reception antennas, the above-mentioned communication is performed. As a result, selection of optimal transmission antennas and reception antennas according to radio communication environment can be performed with high speed with a smaller amount of operation amount than the previous art.

Communication operation is performed with enhanced transmission efficiency by obtaining enhanced communication capacity through optimal allocation of transmission powers to individual MIMO channels obtainable by spatial multiplexing. A transmitter has a plurality of transmission antennas and a receiver has a plurality of reception antennas and perform spatial multiplex communication through transmission and reception with individual antenna weights being set. The transmitter varies the power allocation in units of a communication channel in correspondence to communication quality of the channel. The receiver uses a power allocation value of each communication channel that is estimated in accordance with a reception power of a pilot carrier included in user data after spatially separated. Thereby, the receiver returns the magnitude of the amplitude of a received signal in the signal spacing to an original magnitude, and performs an accurate demapping process.

The present invention makes it possible to realize an antenna device and a portable radio set capable of greatly reducing the deterioration of antenna characteristics while used near a human body and greatly reducing the deterioration of communication quality by electrically connecting first and second antenna elements to a balanced-to-unbalanced transform circuit by connection means when a first antenna element is retracted, supplying power to the first and second antenna elements from an unbalanced transmission line through balanced-to-unbalanced transform means to operate the first and second antenna elements as antennas, preventing a leakage current from flowing to a ground member to which the unbalanced transmission line is grounded from the first and second antenna elements through the transmission in accordance with the balanced-to-unbalancecd transform by the balanced-to-unbalanced transform means, and thereby preventing the ground member from operating as an antenna.

A method and device for path switchover in communications field are provided. The method includes: detecting communication quality of traffic transmitted on an active path and obtaining a detection value of the communication quality; determining whether the detection value meets a switching condition; if yes, switching the traffic transmitted on the active path to a standby path. The device includes a detecting module, an obtaining module, a determining module and a switching module. The embodiment of the present disclosure integrates the NQA technology for detecting the path communication quality and the TE FRR fast path switching technology, and the NQA detection result may trigger the TE FRR path to switch quickly. Therefore, when the signal quality of the path degrades, making the QoS requirement of the SLA hard to meet, the traffic may be switched to standby path to meet the requirement of the SLA agreed originally between the carrier and the user, so as to improve the user experience and the satisfactory degree on the service provided by the carriers.

The invention discloses a method for selecting cell access for terminal equipment, which comprises the following steps: comparing the traveling speed of the terminal equipment and a threshold value; when the traveling speed of the terminal equipment is not smaller than the threshold value, selecting a private network cell to access the terminal equipment; and when the traveling speed of the terminal equipment is smaller than the threshold value, selecting a public network cell to access the terminal equipment. The invention also discloses network equipment for selecting the cell access for the terminal equipment. The communication quality of the terminal equipment can be improved by adopting the invention.

An exemplary method for a communication network according to the present invention includes detecting movement of a mobile station, and modifying a control for the communication network based on the detection of the movement. In an exemplary embodiment, a transmit power control may be increased or decreased based the movement of the mobile station which is detected. Further, the network may determine a base station among plurality of base stations which provides the best communication path, taking into account a movement state of the mobile station. Accordingly, a stable hand over process may be realized, providing favorable communication quality and minimizing the occurrence of disconnection of the mobile terminal from a base station.

The invention discloses an intra-cell device to device direct communication method based on user device relay. According to the method, when a first device and a second device in the same cell need to be communicated with each other, if a ProSe server finds the distance between the two devices is too far to meet the distance requirement of device to device communication, the ProSe sends a request message for searching for an available relay device to an eNB (evolved node base) ; after receiving the request message, the eNB searches and feeds a result back to the ProSe server; the ProSe server selects a proper relay device by using the feedback result, and sends a beacon resource request to the eNB; the eNB respectively allocates beacon resources for the first device and the relay device as well as the second device and the relay device, and the relay device and the second device notify the eNB of a communication quality detection result; device to device communication scheduling is performed; after finishing service transmission, the communication devices release the device to device resources. According to the method, the communication is performed in a device to device relay mode, sending power is reduced, user device energy is saved, and the system performance is improved.

The invention discloses a simultaneous common-frequency full duplex self-interference offset method in a multi-path environment. The method comprises the steps that in the transmission end, a digital signal to be transmitted is sent to a signal pre-correction module and a digital interference offset module, and a radio frequency signal to be transmitted is sent to a radio frequency interference reconstruction unit. The signal outputted by the signal pre-correction module passes through a DAC (digital-to-analog converter) and a transmission radio frequency channel to form a pre-corrected radio frequency signal. In the receiving end, the outputted self-interference signal subtracts the pre-corrected radio frequency signal and the radio frequency signal processed by the radio frequency interference reconstruction unit, the radio frequency self-interference offset is finished, and the offset signal, the pre-corrected radio frequency signal and the converted digital signal are sent to the digital interference offset module to finish the digital interference offset, together with the digital signal to be transmitted and the pre-corrected digital signal. The simultaneous common-frequency full duplex self-interference offset method under the multi-path environment is applicable to a simultaneous common-frequency system, the utilization rate of spectrum is doubled, the radio frequency self-interference offset performance is improved, the communication quality of the system is improved, and the working stability of communication equipment in a simultaneous common-frequency multi-path environment is improved.

A mobile communication system comprises a detecting unit to detect information concerning a moving speed of a mobile terminal, and a selection controlling unit to select a use frequency in a higher frequency band when the speed information detected by the detecting unit is a higher speed, while selecting the use frequency in a lower frequency band when the detected information is a lower speed, and assigning it to the mobile terminal. In a mobile communication system in which a relationship between a terminal moving speed (Doppler frequency) and transmission quality degradation is non-monotonous, the communication quality can be improved and the channel capacity can be increased.

A method selects a path for forwarding a data packet in a wireless communication system. A system capacity versus delay impact curve is calculated for a direct path to mobile station. The direct path has a capacity cost based on communication quality of a direct link between a base station and the mobile station. This curve is shifted by a predetermined time corresponding to an additional delay over a relay path to produce a projected capacity curve for the relay path having a second capacity cost determined according to a combined measure of signal quality of multiple links in the relay path. The second capacity cost is multiplied by a capacity cost ratio to produce a relay capacity curve. The direct path or the relay path is selected based on a comparison of the system capacity versus delay impact curve and the relay capacity curve according to a QoS requirement.

A method in wireless communication systems is provided for switching from P2P (Peer to Peer) communication mode to UP-UTRAN-DOWN (conventional communication mode) and from conventional communication mode to P2P mode, wherein the method performed by a user equipment for switching from P2P communication mode to conventional communication mode comprising steps of: detecting the direct link used by the user equipment in P2P communication with the other user equipment; sending a request for switching to conventional communication mode to a wireless communication network system if the detecting result indicates that the communication quality of the direct link can't satisfy the requirement for P2P communication; and establishing conventional communication connection so as to communicate with said the other user equipment in conventional mode, after receiving the acknowledge (ACK) message of the request for switching sent by the network system.

A server proxy (12), which is arranged between a distribution server (11) and a router (13a), adds quality information to a packet (19a) from the distribution server (11) to output a packet (19b). A plurality of reception terminal proxies (17a-17n), which are arranged immediately before respective reception terminals (18a-18n), remove the quality information from the packet (19b) distributed via a network (14) and routers (13b-13m), and distribute only necessary information to the respective reception terminals (18). Each reception terminal proxy (17) which includes a quality information acquisition unit (17A) acquires the quality information to transmit, from a quality information calculation/transmission unit (17B), the quality information (51) to an accumulation server (15). The accumulation server (15) saves, in a quality information database, packet quality information (52) for each reception terminal (18).

The invention discloses a central air conditioner intelligent control system based on a wireless sensor network and a method, and belongs to the technical field of central air conditioner control. The central air conditioner intelligent control system comprises an intelligent information management center, wireless communication devices, a central air conditioner information monitoring and control module, a room information monitoring and control module and the like. The invention adopts the method that the central air conditioner intelligent control system is used to monitor information, build a data base, calculate current load of the system, and realize advance, accurate and optimized control of a central air conditioner system by combining a short-term loading forecasting method based on similar dates and fuzzy control technology, as well as taking the temperature variation of supply/return chilled/cooling water of a central air conditioner as the manipulated variable. The central air conditioner intelligent control system has the characteristics of great communication capacity, guaranteed communication quality, powerful network functions, wide monitoring range and extensive control quantity of the central air conditioner system, optimized control, high control accuracy, good energy saving effect and the like, and can be widely used in energy-saving optimizing control of various buildings, and is particularly suitable for energy-saving optimizing control of central air conditioners of intelligent buildings.

The present invention provides efficient and effective quality of service for information that is time sensitive (e.g., real time data). An intermediate network communication system and method (e.g., a router) of the present invention performs cut through switching to reduce latency problems for time sensitive information. In one embodiment of the present invention, communication packet header information is encoded with a time sensitive identifier that identifies the information as time sensitive. In one exemplary transfer control protocol/internet protocol TCP/IP implementation of the present invention, time sensitive indication is provided in the link layer information. In one embodiment of the present invention, time sensitive information is dropped if the intermediate network device can not communicate the information within specified timing constraints. In one embodiment of the present invention time sensitive information is cut through routed on a virtual channel and pre-empts non time sensitive information. In one embodiment a communication path probe is cut through routed via intermediate network devices to establish a communication path before other information is communicated from a originating source to a final destination. In one embodiment the present invention leverages previously collected information to establish a communication path. In one embodiment the present invention, an intermediate network device establishes a second communication link if a first communication link is unavailable.

A wireless communication apparatus and a frequency channel selecting method. The wireless communication apparatus includes a transmitting/receiving unit, a storage unit storing updateable indexes relating to a communication condition, an evaluation reference updating unit for updating a reference of a communication quality based on the stored indexes, and a controller that selects frequency channels to communicate data and instructs the transmitting/receiving unit to switch to the selected frequency channels. The frequency channel selecting method includes updating an index representative of a communication quality of a wireless communication for each of a plurality of frequency channels, storing the updateable indexes, updating a reference of a communication quality based on the stored indexes, and selecting frequency channels for communicating based on the updated reference. The communication apparatus and frequency selecting method readily and flexibly select frequency channels with an acceptable communication quality using the updateable index and reference.

A data transmission system capable of mitigating the load on an uplink (feedback channel). A transmitting station of the data transmission system includes a controller for controlling packet communication quality in accordance with a CQI derived based on a packet so that the packet communication quality may become highest, a packet generator for generating a packet, and a transmitter for transmitting the packet. A receiving station of the data transmission system includes a receiver for receiving the packet, a format changer for changing a CQI format in accordance with the communication quality of the received packet, a measuring unit for measuring the CQI based on the CQI format, and a transmitter for transmitting the measured CQI to the transmitting station.

A terminal apparatus firstly transfers packets of a trial class. When the communication quality is insufficient, the terminal apparatus determines after a predetermined period of time whether or not to transfer the trail-class packets again according to a traffic rate of priority-class packets. There are provided a trial-class band capacity not to discard packets of the trial class and a priority-class band capacity not to discard packets of the priority class. Trial-class packets exceeding the former are discarded but the packets that has once become a priority class will not be discarded unless the latter is exceeded.

A visible light communication apparatus of the present invention includes: a target signal receiver filtering only a signal having a target wavelength from a visible light received signal received from a transmitting terminal; a signal generator judging a reception quality of the visible light received signal by using characteristics of the signal having the target wavelength and generating a visible signal by using at least one light source having a wavelength different from the target wavelength in accordance with the reception quality; and an optical signal transmitter transmitting the signal having the target wavelength for transmitting data together with the visible signal and changing a light emitting color of a visible light transmitted signal.

The invention discloses a wave beam updating method applied to sender equipment. The method comprises: after candidate transmitting beam information sent by receiver equipment is received, a transmitting beam for updating a current transmitting beam is selected based on the candidate transmitting beam information; transmitting beam indication information carrying a selection result of the candidate transmitting beam by the sender equipment is sent to the receiver equipment; and data are transmitted to the receiver equipment by using the selected transmitting beam. According to another embodiment, the invention also discloses a wave beam updating method applied to receiver equipment. The method includes: candidate transmitting beam information is sent to sender equipment; after transmitting beam indication information sent by the sender equipment is received, an updated transmitting beam is determined based on the transmitting beam indication information; and data are received on a receiving beam corresponding to the updated transmitting beam. Therefore, the good communication quality of a communication link can be kept and a transmission problem caused by communication link deterioration can be solved. Besides, the invention also discloses wave beam updating equipment.

The present invention discloses a technique for providing a packet recovery method, and the like, capable of starting packet recovery processing without waiting for a wasteful latency (time-out) at a mobile terminal by giving notice of information on a packet discard in a gateway device in real time, thereby enabling improvement in communication quality and communication efficiency. According to the technique, there is provided a packet recovery method for recovering a packet discarded by an intermediate device positioned on a communication path between a mobile terminal and a correspondent node of the mobile terminal among packets exchanged between the mobile terminal and correspondent node, the method including: a step of causing the intermediate device to transmit a discard notification message to the mobile terminal based on information on a communication flow for which transmission of the discard notification message indicating that the packet has been discarded is required; and a step of causing the mobile terminal to transmit the correspondent node a retransmission request message for requesting retransmission of the discarded packet based the discard notification message.

A wireless transmission device converts signals having been subjected to a first modulation into frequency domain signals, and allocates the frequency domain signals converted to subcarriers for transmission. The wireless transmission device includes: a controller that selects, based on channel qualities of the subcarriers to which the frequency domain signals are allocated, a value satisfying a predetermined communication quality as control information indicative of the number of frequency domain signals included in each of segments into which the frequency domain signals are segmentalized; and an allocating unit that segmentalizes the frequency domain signals into segments, each of the segments including the same number of frequency domain signals as the value selected as the control information by the controller, and allocates the frequency domain signals included in each of the segments to sequential subcarriers.

In a communication system (1), a handover of a terminal device (2) is performed between a base station (eNB (3)) of a 3GPP network and a base station (AR (5)) of a non-3GPP network, a QoS measurement result of the handover target network (non-3GPP network) is reported via an interface (ePDG (6)) provided between the 3GPP network and the non-3GPP network, with the base station (AR (5)) of the non-3GPP network acting as a relay, to the base station (eNB (3)) of the 3GPP network, and the handover to the non-3GPP network is controlled according to the QoS measurement result. Accordingly, a communication system can be provided which is capable of suppressing a reduction in communication quality when a handover is performed between networks with different communication protocols.

A method and apparatus for concealing frame loss and an apparatus for transmitting and receiving a speech signal that are capable of reducing speech quality degradation caused by packet loss are provided. In the method, when loss of a current received frame occurs, a random excitation signal having the highest correlation with a periodic excitation signal (i.e., a pitch excitation signal) decoded from a previous frame received without loss is used as a noise excitation signal to recover an excitation signal of a current lost frame. Furthermore, a third, new attenuation constant (AS) is obtained by summing a first attenuation constant (NS) obtained based on the number of continuously lost frames and a second attenuation constant (PS) predicted in consideration of change in amplitude of previously received frames to adjust the amplitude of the recovered excitation signal for the current lost frame. Speech quality degradation caused by packet loss can be reduced for enhanced communication quality in a packet network environment with continuous frame loss.