Abstract: Wi-Fi based position information communicating methods, vehicle mounted communication devices, and pedestrian devices are provided. One of the methods includes: a communication device mounted on a first vehicle determining whether position information of a second vehicle, whose distance to the first vehicle is shorter than a first predetermined distance, is received within a first predefined time period; and if no, broadcasting position information of the first vehicle in a first 802.11 management frame. By employing the methods, pedestrian detection rate may be improved and wireless channel congestion may be mitigated.

Abstract: Disclosed is a method for processing Pachyrhizus juice concentrate with good taste and stable color value, with the steps as follows: (1) pretreatment of raw materials; (2) high-temperature enzymolysis: adding the high-temperature amylase for enzymolysis 30 min at 95° C.; (3) juicing; (4) pasteurization; (5) acidity adjustment; (6) enzymolysis: adding raw materials of glucoamylase 747 ml/T pectinase 50 ml/T, activated carbon 3 kg/T, bentonite 1 kg/T to the Pachyrhizus juice after acidity adjustment; (7) secondary pasteurization: cooling to 53° C.; (8) filtration; filtering through 0.45 um twice; (9) acidity adjustment, concentrating and cardboard filtration to obtain the finished product.

Abstract: Methods and systems for communicating a message through a communication network are provided. A method for receiving a message through a communication network is provided, where the message is partitioned into at least two parts each of which is carried in a corresponding modulated part of a first modulated signal frame, and the at least two modulated parts of the first modulated signal frame have different power levels, the method including: receiving the first modulated signal frame; obtaining control information of the message from the first modulated signal frame; and obtaining the message carried in the first modulated signal frame based on the control information.

Abstract: A method and a system for accessing a channel in a vehicular communication network are provided, where successive cycles each of which includes N time slots are defined in the channel. The method may include: a first communication device mounted on a first node receiving a channel allocation advertisement message from a second communication device mounted on a second node, where the channel allocation advertisement message includes information of how a communication area is divided into M regions and a mapping between the M regions and the N time slots; the first communication device determining in which region the first node is located based on the position of the first node and the information; the first communication device identifying a time slot based on the determined region and the mapping; and the first communication device competing for the identified time slot.

Abstract: A method for broadcasting a message in a vehicular ad hoc network and a vehicle mounted communication system are provided. The method may include: a first communication device mounted on a first vehicle receiving a message from a second vehicle; identifying a first number of vehicles which are within a communication range of the first communication device; calculating a first count-down time based on the first number, where the greater the first number the shorter the first count-down time; and if the first communication device does not receive the message again before the first count-down time ends, broadcasting the message when the first count-down time ends. The efficiency and reliability of message broadcasting may be improved.

Abstract: Methods and systems for communicating a message through a communication network are provided. A method for receiving a message through a communication network is provided, where the message is partitioned into at least two parts each of which is carried in a corresponding modulated part of a first modulated signal frame, and the at least two modulated parts of the first modulated signal frame have different power levels, the method including: receiving the first modulated signal frame; obtaining control information of the message from the first modulated signal frame; and obtaining the message carried in the first modulated signal frame based on the control information.

Abstract: Method and system for localizing a mobile device in a vehicle is provided. The method may include: triggering an audio system mounted on a vehicle, which audio system includes a plurality of speakers, to play an acoustic signal; and calculating a position of a mobile device in the vehicle based on a recording of the audio system's playback of the acoustic signal, which is recorded by the mobile device, and position information of the plurality of speakers. Localization may be more accurate.

Abstract: Methods for broadcasting or receiving information through a channel which is dedicated for vehicular safety use are provided. And electronic devices are provided. One of the methods includes: an electronic device mounted on a vehicle obtaining lane information of the vehicle, where the lane information indicates on which lane the vehicle is travelling; and broadcasting the lane information of the vehicle through a channel which is dedicated for vehicular safety use. By employing the methods, electronic devices can broadcast their lane information, road information or layer information through a channel which is dedicated for vehicular safety use, which may meet requirements in some vehicular safety applications.

Abstract: Method and system for controlling vehicle headlights are provided. The method includes: controlling headlights of a first vehicle based on position and heading direction information of vehicles in the vicinity of the first vehicle received over a vehicle to vehicle communications network. The system includes: a communication device, and a processing device configured to control headlights of a first vehicle based on position and heading direction information of vehicles in the vicinity of the first vehicle received by the communication device over a vehicle to vehicle communications network. The vehicle headlights control method and system are precise and smooth.

Abstract: Methods and systems for communicating a message through a communication network are provided. A method for transmitting a message through a communication network may include: partitioning the message into at least two parts; generating at least two bit sequences each of which carries a corresponding part of the message; modulating the at least two bit sequences to form a modulated signal frame which includes at least two modulated parts corresponding to the at least two bit sequences, respectively, where the at least two modulated parts of the modulated signal frame have different power levels; and transmitting the modulated signal frame through the communication network.

Abstract: A method and system for collaborative spectrum sensing in a cognitive radio network is provided. The method may include: receiving through a cognitive radio network a plurality of sensing results of availability of a channel, where the plurality of sensing results are generated by a corresponding number of vehicles within the cognitive radio network, respectively, where broadcasting of the plurality of sensing results is controlled based on positions of vehicles within the cognitive radio network; and determining whether the channel is available based on the plurality of sensing results. By using the method, the efficiency of collaborative spectrum sensing can be improved.

Abstract: Communication methods and devices are provided. A communication method includes: a first communication device detecting whether its communications is substantially affected; and if yes, sending a message to a second communication device, whose communication distance is shorter than that of the first communication device, to request the second communication device to decrease its effect on the communications of the first communication device. More reliable solutions for spectrum sharing may be obtained.

Abstract: A method and a system for generating a plurality of ranging sound signals for positioning a mobile device are provided. The method includes: each of a plurality of ranging signal generating devices, which are connected to an audio signal cable and are located at different positions in an area, generating a ranging sound signal based on a synchronization signal transmitted on the audio signal cable, whereby location of the mobile device within the area can be obtained based on records of the ranging sound signals made by the mobile device. Accordingly, a plurality of speakers connected in series are able to be controlled to reproduce ranging sound signals for positioning a mobile device.

Abstract: A communication method and system in an Ad-Hoc network using a RR-ALOHA based protocol are provided. The method may include: receiving a data frame which includes N slots, where N is a positive integer greater than two, where a slot includes a payload and a frame information field, where a frame information field includes N sub-frame information fields which correspond to the N slots, respectively, where a sub-frame information field includes a source temporary identifier field for indicating which node occupies its corresponding slot; and if a source temporary identifier field contained in the received data frame equals to a first predetermined value representing the status of free, determining that a corresponding slot is free and can be reserved. By using the method of the disclosure, communication efficiency is improved.

Abstract: A lane detection method and a lane detection system mounted on a first vehicle are provided. The methods includes: calculating on which lane a first vehicle is located based on vehicle-to-vehicle data received by the first vehicle from at least one neighboring vehicle, where the neighboring vehicle means another vehicle located within a vehicle-to-vehicle communication range of the first vehicle. The system may include: a communication device for receiving vehicle-to-vehicle data from at least one neighboring vehicle, and a processing device for calculating on which lane the first vehicle is located based on the vehicle-to-vehicle data received by the communication device, where the neighboring vehicle means another vehicle located within a vehicle-to-vehicle communication range of the first vehicle. Lane detection may not rely on marks on roads which are inherently not clear or blur due to a bad weather.

Abstract: A coarse timing method for a communication system is provided. The coarse timing method may include: calculating timing metric values for received signal samples using a self-correlation based timing metric function; calculating average timing metric values based on previous timing metric values; and determining whether there is a data frame based on the timing metric values and the average timing metric values.

Abstract: A system for reducing collisions in communications utilizing a media access control (MAC) data communication protocol and/or a time division multiple access-based (TDMA-based) data communication protocol, such as an Aloha protocol or an MS-Aloha protocol, that may include one or more electronic devices (such as electronic devices of a vehicular ad-hoc network (VANET)).

Abstract: A trajectory detection method and a trajectory detection system are provided. The method includes: receiving, on a first vehicle, from a second vehicle, dynamic data containing at least one dynamic feature of the second vehicle; detecting a relative position of the second vehicle with regard to the first vehicle using an object detection sensor mounted on the first vehicle; and generating a trajectory of the second vehicle based on the relative position and the dynamic data. Accuracy may be improved.

Abstract: Method for connecting a first electronic device to internet through another electronic device and first electronic devices are provided. The method includes: the first electronic device broadcasting an acoustic signal which carries configuration information for configuring access point, where the configuration information includes an access point identifier, where the configuration information can be extracted from the acoustic signal by another electronic device that receives the acoustic signal and can be used to configure the electronic device as an access point; when an access point having the identifier is detected by the first electronic device, sending to the access point a request for connecting to it to access internet service; and connecting to internet through the access point after a notice of permission is received from the access point.

Abstract: Wi-Fi based position information communicating methods, vehicle mounted communication devices, and pedestrian devices are provided. One of the methods includes: a communication device mounted on a first vehicle determining whether position information of a second vehicle, whose distance to the first vehicle is shorter than a first predetermined distance, is received within a first predefined time period; and if no, broadcasting position information of the first vehicle in a first 802.11 management frame. By employing the methods, pedestrian detection rate may be improved and wireless channel congestion may be mitigated.