Abstract: A robust header compression processing method and a robust header compressor are disclosed. The method includes: a compressor processing a plurality of data packets at the front of a packet flow by using an Internet Protocol (IP) identifier random behavior pattern, and determining an IP identifier behavior pattern according to characteristics of IP identifiers in the plurality of data packets at the front; and the compressor processing subsequent data packets of the packet flow according to the determined IP identifier behavior pattern. With the robust header compression processing method and the robust header compressor, waste of wireless resources can be avoided, and a utilization rate of the wireless resources can be enhanced.

Abstract: A robustness header compression processing method, compressor and system are disclosed. The method includes: after receiving a CONTEXT_MEMORY option transmitted by a decompressor, a compressor selecting to use Profile0 to perform data compression on packets to be compressed; and after determining that a first threshold is reached by using the Profile0, the compressor performing data compression using a Profile type to which the packets to be compressed belong. In the above robustness compression processing method, compressor and system, after receiving a CONTEXT_MEMORY feedback option, a compressor selects a compression packet format Profile0 and attempts to restore normal compression and decompression after a certain period of time, thus improving efficiency and accuracy of compression and decompression as well as utilization of wireless bandwidth.

Abstract: A method and system for improving robustness of context update messages in robust header compression are disclosed in the present document, wherein, the method includes: when sending the context update message, a compressor performing check processing on important fields in the context update message, generating a check code, and sending the check code and the context update message out together; and after receiving the context update message and the check code of the important fields in the context update message, a decompressor firstly performing checking on the important fields in the context update message, if the checking is passed, continuing to execute decompression processing, and if the checking is failed, discarding the context update message. With the present document, the probability of mistaking other compression packets for IR/IR-DYN messages due to bit errors of packet format fields can be reduced, and the correctness of packet format identification can be improved.

Abstract: A robustness header compression processing method, compressor and system are disclosed. The method includes: after receiving a CONTEXT_MEMORY option transmitted by a decompressor, a compressor selecting to use Profile0 to perform data compression on packets to be compressed; and after determining that a first threshold is reached by using the Profile0, the compressor performing data compression using a Profile type to which the packets to be compressed belong. In the above robustness compression processing method, compressor and system, after receiving a CONTEXT_MEMORY feedback option, a compressor selects a compression packet format Profile0 and attempts to restore normal compression and decompression after a certain period of time, thus improving efficiency and accuracy of compression and decompression as well as utilization of wireless bandwidth.

Abstract: A method for compressing a user datagram protocol (UDP) data packet includes: when receiving an Internet Protocol version 4 (IPv4) UDP data packet, a compressor searching a context of the UDP data packet, if the context does not exist, creating the context of the UDP data packet, taking a value of an IP identifier (IP-ID) field of the UDP data packet as an initial value of a serial number (SN) of the context, and then compressing the UDP data packet according to the context. Also provided are methods and devices for compressing and decompressing a UDP data packet. The methods and devices can effectively improve the compression efficiency, reduce the probability of sending the IR/IRDYN packet, significantly reduce 1 byte transmission, improve the compression efficiency by 50%, and reduce the probability of using an extension header with a high capacity.

Abstract: A robust header compression processing method and a robust header compressor are disclosed. The method includes: a compressor processing a plurality of data packets at the front of a packet flow by using an Internet Protocol (IP) identifier random behavior pattern, and determining an IP identifier behavior pattern according to characteristics of IP identifiers in the plurality of data packets at the front; and the compressor processing subsequent data packets of the packet flow according to the determined IP identifier behavior pattern. With the robust header compression processing method and the robust header compressor, waste of wireless resources can be avoided, and a utilization rate of the wireless resources can be enhanced.

Abstract: A method and apparatus for mode transformation, compression and decompression in robust header compression is provided. The method for mode transformation includes: setting a mode parameter field in an IR/IRDYN compression package of which a package formats is Profile2 and Profile3; after receiving a mode transformation request carrying an expected target mode, a compression party obtaining information about the expected target mode from the mode transformation request and sending out the information about the expected target mode by carrying that information in the mode parameter field in the IR/IRDYN compression package; a decompression party obtaining mode parameter information from the mode parameter field in the IR/IRDYN compression package. The present invention can ensure that deadlock of the mode transformation will not occur on the original procedure.

Abstract: A method and apparatus for compressing and decompressing a time stamp is provided, applied in a scenario of compressing a basic compression packet carrying an extended compression packet of type 3 in Robust Header Compression (ROHC). The compression method comprises: storing high bits of a time stamp to be transmitted in a time stamp field of the basic compression packet; storing bits of successive zeros beginning from the highest bit of the remaining bits of the time stamp to be transmitted after removing said high bits in the extended compression packet in a form of number information; and storing the remaining bits of the time stamp to be transmitted after removing said high bits and said bits of successive zeros in the time stamp field of the extended compression packet as low bits. Therefore the compression space can be effectively used and compression efficiency can be improved.

Abstract: A packet data transmitting method for packet service domain is disclosed. After receiving a Service Data Unit (SDU), a Packet Data Convergence Protocol (PDCP) entity determines how to handle the SDU in a cache queue and process a Protocol Data Unit (PDU) record in a Serial Number (SN) window based on whether or not the cache queue includes any SDU and the SN window is full, respectively. When both the cache queue and the SN window are full, the PDCP entity processes PDU records in the SN window according to their respective weight values and processes an SDU in the cache queue into a new PDU accordingly. A packet data transmitting system for packet service domain is also disclosed, which can prolong the time window for confirming a PDU record in the SN window.

Abstract: A method and system for improving robustness of context update messages in robust header compression are disclosed in the present document, wherein, the method includes: when sending the context update message, a compressor performing check processing on important fields in the context update message, generating a check code, and sending the check code and the context update message out together; and after receiving the context update message and the check code of the important fields in the context update message, a decompressor firstly performing checking on the important fields in the context update message, if the checking is passed, continuing to execute decompression processing, and if the checking is failed, discarding the context update message. With the present document, the probability of mistaking other compression packets for IR/IR-DYN messages due to bit errors of packet format fields can be reduced, and the correctness of packet format identification can be improved.

Abstract: The present invention discloses a method and apparatus for a mode transformation in a robust header compression, compression and decompression. The method for mode transformation includes: setting a mode parameter field in an IR compression package/IRDYN compression package of which a package formats is Profile2 and Profile3; after receiving a mode transformation request carrying an expected target mode, a compression party obtaining information about the expected target mode from the mode transformation request and sending out the information about the expected target mode by carrying that information in the mode parameter field in the IR/IRDYN compression package; after receiving a mode transformation reply, a decompression party obtaining mode parameter information from the mode parameter field in the IR/IRDYN compression package if judging that the IR/IRDYN compression package is used for the reply.

Abstract: A packet data transmitting method for packet service domain is disclosed. After receiving a Service Data Unit (SDU), a Packet Data Convergence Protocol (PDCP) entity determines how to handle the SDU in a cache queue and process a Protocol Data Unit (PDU) record in a Serial Number (SN) window based on whether or not the cache queue includes any SDU and the SN window is full, respectively. When both the cache queue and the SN window are full, the PDCP entity processes PDU records in the SN window according to their respective weight values and processes an SDU in the cache queue into a new PDU accordingly. A packet data transmitting system for packet service domain is also disclosed, which can prolong the time window for confirming a PDU record in the SN window.

Abstract: A method and apparatus for compressing and decompressing a time stamp is provided, applied in a scenario of compressing a basic compression packet carrying an extended compression packet of type 3 in Robust Header Compression (ROHC). The compression method comprises: storing high bits of a time stamp to be transmitted in a time stamp field of the basic compression packet; storing bits of successive zeros beginning from the highest bit of the remaining bits of the time stamp to be transmitted after removing said high bits in the extended compression packet in a form of number information; and storing the remaining bits of the time stamp to be transmitted after removing said high bits and said bits of successive zeros in the time stamp field of the extended compression packet as low bits. Therefore the compression space can be effectively used and compression efficiency can be improved.

Abstract: A method for compressing a user datagram protocol (UDP) data packet includes: when receiving an Internet Protocol version 4 (IPv4) UDP data packet, a compressor searching a context of the UDP data packet, if the context does not exist, creating the context of the UDP data packet, taking a value of an IP identifier (IP-ID) field of the UDP data packet as an initial value of a serial number (SN) of the context, and then compressing the UDP data packet according to the context. Also provided are methods and devices for compressing and decompressing a UDP data packet. The methods and devices can effectively improve the compression efficiency, reduce the probability of sending the IR/IRDYN packet, significantly reduce 1 byte transmission, improve the compression efficiency by 50%, and reduce the probability of using an extension header with a high capacity.