CN103595660A - IP data packet encapsulating method and method for compressing packet head of data packet - Google Patents
IP data packet encapsulating method and method for compressing packet head of data packet Download PDFInfo
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Abstract
The invention provides an IP data packet encapsulating method and a method for compressing a packet head of an IP data packet. The IP data packet encapsulating method includes the first step of setting the data type as the IP data packet and setting the working mode of baseband frames in frame headers of the baseband frames, the second step of populating the IP data packet to be sent from the first byte of a data field of the current baseband frame, wherein the first byte is determined according to the length of the remaining IP data packet of the last baseband frame, and the third step of filling part of data in the IP data packet in the free space to completing encapsulating the current baseband frame if the free space of the current baseband frame is not enough to load one whole IP data packet. Through the IP data packet encapsulating method, the channel utilization rate and transmission efficiency of the IP data packet are improved.
Description
Technical field
The present invention relates to digital television broadcasting, particularly the header compression method of a kind of method for packing of IP packet and IP packet.
Background technology
In existing digital television broadcasting, the Various types of data that comprises audio frequency and video is all that the form by transport stream (Transport Stream, TS) encapsulates and transmits.Along with the development of technology evolution and application, data encapsulation and transmission centered by IP packet are widely used, and are the necessary component of digital television broadcasting system of future generation.
Conventionally, the method for transmission of IP data bag is: after IP packet is packaged into transport stream packets (being TS bag) by specific protocol, transmit again.Because such transmission method need to carry out the longer IP packet of length repeated segmentation to form shorter TS bag, thereby increase system complexity, more introduced a large amount of hashes, reduced transmission rate.Root it is documented, when IP packet encapsulation is transport stream packets, protocol overhead (Overhead) can reach more than 10%.
In order to address the above problem, can adopt the digital television broadcasting communication protocol of direct support IP data packet transmission, but in practice by many difficulties, for example, indefinite length and the excursion of IP packet are larger, and it is thorough that the method for packing of design IP packet need to be considered; Each IP packet has an IP packet header (IP Header), according to different IP agreements, IP packet header length is at least respectively 20 bytes (for IPv4) and 40 bytes (for IPv6), therefore in data transmission procedure, need the channel capacity of significant proportion for the IP packet header of transmitting redundancy, reduced channel utilization.
Summary of the invention
The problem that the present invention solves is that the efficiency of digital television broadcasting communications IP packet is not high.
For addressing the above problem, the embodiment of the present invention provides a kind of method for packing of IP packet, comprising: in each base band frame frame head, the mode of operation that data type is IP packet and base band frame is set; From first byte in current base band frame data territory, insert IP packet to be sent, wherein said the first byte is to determine according to the length of the remaining IP packet of a upper base band frame; If the remaining space in current base band frame data territory is not enough to carry an IP packet, the partial data in this IP packet is filled up to described remaining space to have encapsulated current base band frame.
Alternatively, the method for packing of IP packet also comprises: in the situation that the partial data in this IP packet is filled up to described remaining space to have encapsulated current base band frame, the remaining data in this IP packet is filled in next base band frame data territory.
Alternatively, describedly remaining data in this IP packet is filled to next base band frame data territory refers to: the remaining IP packet of a base band frame on preferential filling in next base band frame data territory, and determine described the first byte according to the length of this remaining IP packet.
The embodiment of the present invention also provides the header compression method of IP packet in a kind of base band frame, wherein said base band frame is to obtain after the method for packing of employing above-mentioned IP packet encapsulates IP packet, and described header compression method comprises: from first byte in current base band frame data territory, start to obtain successively each IP packet; Take first IP packet is benchmark, respectively the packet header of the packet header of follow-up IP packet and first IP packet is compared; If the comparative result in the packet header of all follow-up IP packets and the packet header of first IP packet conforms to a predetermined condition, according to predetermined way, the packet header of follow-up IP packet is compressed to reduce the length of data field; Wherein, described predetermined condition and predetermined way are that mode of operation based on this base band frame is determined.
Alternatively, if the mode of operation of current base band frame is first mode, the comparative result in the packet header of all follow-up IP packets and the packet header of first IP packet conforms to a predetermined condition and comprises:
Whether the IP address in the packet header of more all follow-up IP packets is all identical with the IP address in the packet header of first IP packet, and wherein said IP address comprises transmitting terminal address and receiving terminal address;
If above-mentioned, judgment result is that to be, the IP address in the packet header of all follow-up IP packets is deleted, and these IP packets are moved forward to fill up successively the shared space, IP address of deletion.
Alternatively, whether the IP address in the packet header of the IP address in the packet header of more all follow-up IP packets and first IP packet also comprises before all identical:
According to the field judgement IP protocol version in the packet header of each IP packet;
Based on IP protocol version, search the residing position, IP address in packet header of each IP packet.
Alternatively, if the mode of operation of current base band frame is the second pattern, the comparative result in the packet header of all follow-up IP packets and the packet header of first IP packet conforms to a predetermined condition and comprises:
Whether the packet header of more all follow-up IP packets is all identical with the content except bag long word section and check field in the packet header of first IP packet;
If above-mentioned, judgment result is that to be, the packet header of all follow-up IP packets is deleted, and before these IP packets, insert the shared space, packet header that corresponding IP bag is long and these IP packets are moved forward to fill up successively deletion.
Compared with prior art, technical solution of the present invention has following beneficial effect:
The method for packing of the IP packet providing according to the embodiment of the present invention is directly filled IP packet in base band frame data territory, and IP packet does not need initiatively to cut apart section, has reduced system complexity; And the base band frame that encapsulation obtains can be directly used in digital television broadcasting transmission, improved the efficiency of transmission of IP packet.
Further, when the remaining space in current base band frame data territory is not enough to carry an IP packet, IP packet to be filled is cut apart to section, and wherein a part is filled up this remaining space, and the IP packet that exceeds remaining space part is filled to next base band frame data territory, thereby improved channel utilization.And IP packet and the new IP packet of filling that the first byte is divided remainder is set in base band frame data territory, thereby be convenient to receiving terminal, by searching the first residing position of byte, obtain IP packet.
The header compression method of IP packet in base band frame, detects each IP packet successively from first byte in base band frame data territory.Different working modes based on each base band frame, the packet header of the IP packet of its carrying has different characteristics, the packet header of the IP packet conforming to a predetermined condition is compressed to reduce to the length of data field, thereby further improved the efficiency of transmission of channel utilization and IP packet.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of embodiment of the method for packing of a kind of IP packet of the present invention;
Fig. 2 is the structural representation of a kind of base band frame of the present invention;
Fig. 3 is the schematic flow sheet of the embodiment of the header compression method of IP packet in a kind of base band frame of the present invention;
Fig. 4 A is base band frame of the present invention base band frame structure schematic diagram after the compression of the packet header of IP packet under first mode;
Fig. 4 B is base band frame of the present invention base band frame structure schematic diagram after the compression of the packet header of IP packet under the second pattern.
Embodiment
Inventor finds that the efficiency of digital television broadcasting communications IP packet in prior art is not high.
For the problems referred to above, inventor, through research, provides the header compression method of IP packet in a kind of method for packing of IP packet and base band frame, has improved the efficiency of transmission of channel utilization and IP packet.
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
As shown in Figure 1 be the schematic flow sheet of embodiment of the method for packing of a kind of IP packet of the present invention.With reference to figure 1, the method for packing of described IP packet comprises the steps:
Step S11: in each base band frame frame head, the mode of operation that data type is IP packet and base band frame is set;
Step S12: insert IP packet to be sent from first byte in current base band frame data territory, wherein said the first byte is to determine according to the length of the remaining IP packet of a upper base band frame;
Step S13: if the remaining space in current base band frame data territory is not enough to carry an IP packet, the partial data in this IP packet is filled up to described remaining space to have encapsulated current base band frame.
At digital television broadcasting transmission field, be in broadcast channel transmission of IP data bag, need to by IP packet encapsulation, be the base band frame structure that digital television broadcasting is used.
As shown in Figure 2 be a kind of structural representation of base band frame.With reference to figure 2, described base band frame comprises base band frame frame head (BBHEADER), data field (DATA FIELD) and for the region (PADDING AND/OR IN-BAND SIGNALING) of zero filling and in-band signalling.
Wherein, base band frame frame head specifically comprises MATYPE field (2 byte), DFL field (2 byte), SYNCD field (2 byte), INDICATORS field (1 byte) and CRC-8 field (1 byte).Described MATYPE field also comprises Stream the type field (3 bits) and retains bit field (13 bits); INDICATORS field also comprises HDRI field (2 bits) and retains bit field (6 bits).
Data field is used for filling each IP packet.Described base band frame structure is applicable to IPv4 agreement and IPv6 agreement, and according to the difference of IP agreement, the packet header length of IP packet is also different, for IPv4 agreement, at least 20, the packet header byte of IP packet, and for IPv6 agreement, at least 40, the packet header of IP packet byte.
Unlike the prior art, in the present embodiment, IP packet is directly filled in base band frame data territory, and IP packet do not need initiatively to cut apart section, reduced system complexity.
Specifically, as described in step S11, in each base band frame frame head, the mode of operation that data type is IP packet and base band frame is set.
For example, in base band frame frame head (BBHEADER), MATYPE field is set in Stream Type register for " 001 ", take and represent that the data type that base band frame data territory is carried is IP packet.The mode of operation of base band frame is controlled by HDRI register in INDICATORS field in base band frame frame head.For example, during HDRI=" 00 ", do not use the packet header compression of IP packet; During HDRI=" 01 ", use the header compression method of IP packet and work in pattern one; During HDRI=" 10 ", use IP header compression method and work in pattern two; The situation of HDRI=" 11 " is reserved.
Wherein, the mode of operation of base band frame mainly comprises high effective model (pattern one) and high effective model (pattern two) more.When the follow-up packet header to the IP packet in base band frame data territory is compressed, need to determine different packet header compress modes according to different mode of operations, this will describe in detail below.
As described in step S12, from first byte in current base band frame data territory, insert IP packet to be sent.
Specifically, in base band frame data territory, fill in the process of IP packet, in the situation that current data territory has sufficient space (at least can store a complete IP packet) to deposit IP packet, do not need initiatively IP packet to be cut apart to section.
In this step, the IP packet to be sent of inserting from first byte in current base band frame data territory is complete IP packet.Wherein, described the first byte is to determine according to the length of the remaining IP packet of a upper base band frame.That is to say, when a upper base band frame has remaining IP packet not to be filled to a upper base band frame data territory, this remaining IP packet will preferentially be filled in current base band frame data territory, and the position of depositing is the residing position of original position to the first byte in current base band frame data territory.Then, next IP packet (complete IP packet) and follow-up IP packet will be filled to base band frame data territory successively since the first byte position.
As described in step S13, if the remaining space in current base band frame data territory is not enough to carry an IP packet, the partial data in this IP packet is filled up to described remaining space to have encapsulated current base band frame.
Specifically, in the situation that the remaining space in current base band frame data territory is less than an IP packet, need to passively IP packet be cut apart to section, the remaining space that wherein a part of IP packet fills up data field is to have encapsulated current base band frame, and remaining IP packet will be filled to (concrete process of filling is described in above-mentioned steps S12) in next base band frame data territory.
In other embodiments, also can give up the remaining space in current base band frame data territory, this remaining space uses zero data stuffing to have encapsulated current base band frame.In this case, data field length (DFL) field that also needs to upgrade in base band frame frame head is actual numerical value, is about to the length that former data field length deducts remainder certificate.
Utilize the method for packing of the IP packet that the present embodiment provides to reduce system complexity, the base band frame that encapsulation obtains can be directly used in digital television broadcasting transmission, has improved the efficiency of transmission of IP packet.
Further, inventor also provides a kind of method that the packet header of each IP packet in base band frame data territory is compressed, further to improve the efficiency of transmission of channel utilization and IP packet.
As shown in Figure 3 be the schematic flow sheet of the embodiment of the header compression method of IP packet in a kind of base band frame of the present invention.With reference to figure 3, described header compression method comprises the steps:
Step S21: start to detect successively each IP packet from first byte in current base band frame data territory;
Step S22: take first IP packet is benchmark, respectively the packet header of the packet header of follow-up IP packet and first IP packet is compared;
Step S23: if the comparative result in the packet header of all follow-up IP packets and the packet header of first IP packet conforms to a predetermined condition, according to predetermined way, the packet header of follow-up IP packet is compressed to reduce the length of data field; Wherein, described predetermined condition and predetermined way are that mode of operation based on this base band frame is determined.
Inventor finds after deliberation, the different working modes based on each base band frame, and the packet header of the IP packet of its carrying has different characteristics, utilizes these characteristics further to the packet header of IP packet, to compress so that data field obtains additional space.
Specifically, as described in step S21, from first byte in current base band frame data territory, start to detect successively each IP packet.
In the present embodiment, described base band frame is to obtain after adopting the method for packing of the IP packet that above-described embodiment provides to encapsulate to IP packet.Therefore, in this step, need to start from first byte in base band frame data territory each IP packet of one-time detection, can guarantee that like this first IP packet that starts to detect is a complete IP packet (packet header that comprises IP packet).
As described in step S22, take first IP packet is benchmark, respectively the packet header of the packet header of follow-up IP packet and first IP packet is compared.As described in step S23, if the comparative result in the packet header of all follow-up IP packets and the packet header of first IP packet conforms to a predetermined condition, according to predetermined way, the packet header of follow-up IP packet is compressed to reduce the length of data field
In the present embodiment, according to the different working modes of each base band frame, its relatively concrete object and compression processing mode is also different.That is to say, described predetermined condition and predetermined way are that the mode of operation based on this base band frame is determined.
Specifically, if the mode of operation of current base band frame is first mode (being high effective model), the comparative result in the packet header of all follow-up IP packets and the packet header of first IP packet conforms to a predetermined condition and comprises the steps:
Whether the IP address in the packet header of more all follow-up IP packets is all identical with the IP address in the packet header of first IP packet, and wherein said IP address comprises transmitting terminal address and receiving terminal address.
If above-mentioned, judgment result is that to be, the IP address in the packet header of all follow-up IP packets is deleted, and these IP packets are moved forward to fill up successively the shared space, IP address of deletion.Otherwise if the determination result is NO above-mentioned, do not carry out the packet header compression of IP packet and process.
It should be noted that, should the determination result is NO refer to: in the IP address of more all follow-up IP packets and the IP address process of first IP packet, as long as an address difference in transmitting terminal address or receiving terminal address, determines that the determination result is NO.
Further, because the head-coating structure of the IP packet of IPv4 agreement and IPv6 agreement is different, therefore, during detection, also need the protocol version according to the Version field in IP packet packet header (0th ~ 3 bit) judgement IP, and then find the residing position, IP address in each IP packet packet header based on IP protocol version.
Under above-mentioned first mode, the structural representation of the base band frame after the packet header of the IP packet of base band frame is compressed as shown in Figure 4 A.
If the mode of operation of current base band frame is the second pattern (more high effective model), the comparative result in the packet header of all follow-up IP packets and the packet header of first IP packet conforms to a predetermined condition and comprises:
Whether the packet header of more all follow-up IP packets is all identical with the content except bag long word section and check field in the packet header of first IP packet.
If above-mentioned, judgment result is that to be, the packet header of all follow-up IP packets is deleted, and before these IP packets, insert the shared space, packet header that corresponding IP bag is long and these IP packets are moved forward to fill up successively deletion.Otherwise if the determination result is NO above-mentioned, do not carry out the packet header compression of IP packet and process.
It should be noted that, due in the situation that meeting above-mentioned predetermined condition, that the packet header of follow-up all IP packets is all deleted, these IP packets (removing behind packet header) are moved forward to fill up behind shared space, packet header of deletion successively, and receiving terminal cannot be distinguished these IP packets.Therefore, need to after the IP of the front insertion correspondence of these IP packets (i.e. follow-up IP packet except first IP packet) bag is long, move forward successively again to fill up the shared space, packet header of deletion.
Under above-mentioned the second pattern, the structural representation of the base band frame after the packet header of the IP packet of base band frame is compressed as shown in Figure 4 B.
Further, if the header compression method that base band frame has adopted the embodiment of the present invention to provide in processing procedure is compressed, data field will obtain extra remaining space.Therefore, in IP waiting for transmission is wrapped successively according to the rule of " first mode " or " the second pattern " and data field, first complete IP packet compares.If eligible, carry out same operation and delete IP address or the IP packet header of this IP packet waiting for transmission and be packed in data field, until data field space is used up.If ineligible, give up the remaining space of data field, upgrade data field length (DFL) field in base band frame frame head, and start the processing of next base band frame.
In sum, the method for packing of IP packet and the header compression method of base band frame IP packet that adopt the technical program to provide, improved the efficiency of transmission of channel utilization and IP packet.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement to make possible change and modification to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection range of technical solution of the present invention.
Claims (8)
1. a method for packing for IP packet, is characterized in that, comprising:
In each base band frame frame head, the mode of operation that data type is IP packet and base band frame is set;
From first byte in current base band frame data territory, insert IP packet to be sent, wherein said the first byte is to determine according to the length of the remaining IP packet of a upper base band frame;
If the remaining space in current base band frame data territory is not enough to carry an IP packet, the partial data in this IP packet is filled up to described remaining space to have encapsulated current base band frame.
2. the method for packing of IP packet as claimed in claim 1, is characterized in that, also comprises:
The partial data in this IP packet being filled up to described remaining space to have encapsulated after current base band frame, the remaining data in this IP packet is filled in next base band frame data territory.
3. the method for packing of IP packet as claimed in claim 2, is characterized in that, describedly remaining data in this IP packet is filled to next base band frame data territory refers to:
The remaining IP packet of a base band frame on preferential filling in next base band frame data territory, and determine described the first byte according to the length of this remaining IP packet.
4. the method for packing of IP packet as claimed in claim 1, is characterized in that, described IP packet is supported IPv4 agreement and IPv6 agreement.
5. a header compression method for IP packet in base band frame, wherein said base band frame is to obtain after adopting the method for packing of IP packet as claimed in claim 1 to encapsulate IP packet, it is characterized in that, described header compression method comprises:
From first byte in current base band frame data territory, start to detect successively each IP packet;
Take first IP packet is benchmark, respectively the packet header of the packet header of follow-up IP packet and first IP packet is compared;
If the comparative result in the packet header of all follow-up IP packets and the packet header of first IP packet conforms to a predetermined condition, according to predetermined way, the packet header of follow-up IP packet is compressed to reduce the length of data field; Wherein, described predetermined condition and predetermined way are that mode of operation based on this base band frame is determined.
6. the header compression method of IP packet in base band frame as claimed in claim 5, it is characterized in that, if the mode of operation of current base band frame is first mode, the comparative result in the packet header of all follow-up IP packets and the packet header of first IP packet conforms to a predetermined condition and comprises:
Whether the IP address in the packet header of more all follow-up IP packets is all identical with the IP address in the packet header of first IP packet, and wherein said IP address comprises transmitting terminal address and receiving terminal address;
If above-mentioned, judgment result is that to be, the IP address in the packet header of all follow-up IP packets is deleted, and these IP packets are moved forward to fill up successively the shared space, IP address of deletion.
7. the header compression method of IP packet in base band frame as claimed in claim 6, is characterized in that, before whether the IP address in the packet header of more all follow-up IP packets and IP address in the packet header of first IP packet be all identical, also comprises:
According to the field judgement IP protocol version in the packet header of each IP packet;
Based on IP protocol version, search the residing position, IP address in each IP packet packet header.
8. the header compression method of IP packet in base band frame as claimed in claim 5, it is characterized in that, if the mode of operation of current base band frame is the second pattern, the comparative result in the packet header of all follow-up IP packets and the packet header of first IP packet conforms to a predetermined condition and comprises:
Whether the packet header of more all follow-up IP packets is all identical with the content except bag long word section and check field in the packet header of first IP packet;
If above-mentioned, judgment result is that to be, the packet header of all follow-up IP packets is deleted, and before these IP packets, insert the shared space, packet header that corresponding IP bag is long and these IP packets are moved forward to fill up successively deletion.
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| CN110012314B (en) * | 2019-01-30 | 2021-10-12 | 国家广播电视总局广播电视科学研究院 | IP transmission method and system based on DTMB |
| CN111770045A (en) * | 2019-08-14 | 2020-10-13 | 北京京东尚科信息技术有限公司 | Information processing method, device, equipment and computer readable storage medium |
| CN110601971A (en) * | 2019-09-17 | 2019-12-20 | 南京林业大学 | Data transmission method and device, electronic equipment and storage medium |
| CN111030985A (en) * | 2019-10-29 | 2020-04-17 | 视联动力信息技术股份有限公司 | Data packet sending method and device |
| CN111478864A (en) * | 2020-03-06 | 2020-07-31 | 视联动力信息技术股份有限公司 | Data packet processing method and device, electronic equipment and storage medium |
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