Please select the most similar patent number from A, B, C and D. Which number is?
An information transmission method in a radio frequency identification system includes: the information to be sent is composed to a frame which is sent after being coded and modulated, wherein, the constitution of the frame comprises a lead code/ a frame synchronization code, data information and check information; the lead code and the frame synchronization code adopt the same format which consists of a delimiter of the frame synchronization code and the lead code, the data 0 and the data 1 in sequence. An information transmission system in a radio frequency identification system is also provided. In the system, a frame composition unit is used for composing the information to be sent to a frame, wherein, the constitution of the frame comprises the lead code/ the frame synchronization code, the data information and the check information, the lead code and the frame synchronization code adopt the same format which consists of a delimiter of the frame synchronization code and the lead code, the data 0 and the data 1 in sequence. Adopting the above method and system reduces the design complexity of the frame and improves the efficiency of the information transmission.
A: Disclosed are a data transmission method, comprising: a first device transmits first information of a first data block to a second device; the second device searches in a first index for a second data block similar to the first data block on the basis of the first information; the second device transmits second information of the second data block to the first device; the first device acquires locally a reference block identical to the second data block on the basis of the second information; the first device compresses a differentiating part of the first data block relative to the reference block to produce first compressed information; the first device transmits the first compressed information to the second device; and the second device obtains the first data block on the basis of the first compressed information and of the second data block. Also provided in the embodiments of the present application are a system, an apparatus, a device, and a medium. With respect to a data block to be transmitted, if a transmitted data block similar thereto is present, then only the part differentiating the two data blocks is transmitted, thus increasing the transmission efficiency of a data synchronization technique.
B: Provided in the present application is a coding signal detection method, wherein each coding signal sequence comprises a positive code and a negative code, and each coding signal comprises a preamble area and a data area, the method comprising: receiving preamble area data; on the basis of a positive code encoding rule, identifying the preamble area data; determining whether the identified preamble area data is the same as transmitted preamble area data; and, if each code in the identified preamble area data has the opposite phase to each code in the transmitted preamble area data, then identifying data area data on the basis of a negative code encoding rule. The method provided in the present application enables an active pen to identify negative codes and ensures that the active pen does not experience broken lines when drawing lines on a touch control screen, enhancing the user experience.
C: A radio frequency identification system based communication method, apparatus and system are disclosed, which are used for implementing bi-directional communication between an electronic tag and a reader in the radio frequency identification system, saving battery power consumption in an active electronic tag, and guaranteeing communication stability between the electronic tag and the reader. Wherein, the method includes: receiving data frames sent by the reader in the current checking period, analyzing the data frames and extracting frame sequence numbers from preset fields, calculating waiting time required for the current checking period to enter into a channel idle state based on the extracted frame sequence numbers, selecting one timeslot from timeslots included in the current checking period when determining the reader is in the channel idle state, and transmitting messages to the reader based on the selected timeslot.
D: Disclosed in the embodiments of the present invention are a data processing method, a server and a device. The method comprises: a server, upon acquisition of first information sent by a client device, dividing N first data blocks to obtain M groups of data, and determining check information corresponding to each group of data; further, the server determining difference information according to a second data packet and the check information corresponding to the M groups of data, and sending the difference information to the client device, so that the client device updates a first data packet according to the difference information. In the embodiments of the present invention, the server is able to transmit the difference information to the client device without sending the entire first data packet to the client device, thereby avoiding repeated transmission of data information, reducing the loss of network traffic, and improving the efficiency of data synchronization; furthermore, in the embodiments of the present invention, a communication exchange process between the client device and the server can be executed only once, thereby reducing the pressure of network communication and reducing the network transmission traffic.
Answer: C