CN103404101A - Decoding method and device - Google Patents

Abstract

The embodiment of the invention discloses a decoding method and device. The method includes: obtaining a type of encrypted data packet, which is encrypted known information bit information, and the type of encrypted data packet comes from the RLC layer; predicting the SN of the second type of encrypted data packet, the second type of encrypted data packet The packet comes from the physical layer of the sending end; according to the predicted SN, the encrypted data packet of the second type is decoded by using the encrypted known information bit information in the encrypted data packet of the first type. The decoding method and device of the embodiments of the present invention can more effectively use known bit information for decoding, so as to improve decoding efficiency.

Description

Decoding method and device

technical field

The present invention relates to the communication field, and more particularly, to a decoding method and device.

Background technique

With the popularization of smart terminals and the massive increase in demand for mobile applications, mobile services present new features. IP-based services such as web browsing and video-on-demand account for an increasing proportion of terminal network traffic. Compared with traditional voice and file transmission services, web browsing and video-on-demand services bring new requirements such as higher speed and shorter delay to mobile networks, and these services themselves also present new characteristics. These services require a relatively large transmission rate for the downlink, but for the uplink, it usually mainly feeds back a large number of TCP/IP confirmation small data packets for downlink transmission, and a small part of these data packets is to attach a small amount of content to the TCP/IP header , most of which only include TCP/IP headers. According to the TCP/IP protocol, the TCP/IP header has a lot of fixed information, such as the source address in the IP header and some fixed padding fields. These fixed information contain a wealth of known information that can be used. However, due to the high-level encryption of the received data packets, these known information are actually unknown to the physical layer on the base station side, and cannot be transmitted at the physical layer on the base station side. Auxiliary decoding is performed using these encrypted known information.

In the prior art, the physical layer simply regards these fixed known information as all 0s or all 1s. If encrypted, it is no longer all 0s or all 1s, and auxiliary decoding cannot be performed.

Contents of the invention

Embodiments of the present invention provide a decoding method and a decoding device, which can improve the efficiency of decoding using known information bits.

In the first aspect, a decoding method is provided, including: obtaining a type of encrypted data packet, the type of encrypted data packet is encrypted known information bit information, and the type of encrypted data packet comes from the wireless link control ( Radio Link Control, referred to as "RLC") layer; predict the SN of the second type of encrypted data packet, the second type of encrypted data packet comes from the physical layer of the sender; according to the predicted SN, use the encrypted The known information bit information of the second type of encrypted data packet is decoded.

In a first possible implementation, before acquiring a type of encrypted data packet, the method further includes: in the RLC layer entity, generating a cipher stream corresponding to the SN based on each SN in the SN group corresponding to the RLC entity , using the cipher stream to encrypt the known information bit information to obtain this type of encrypted data packet.

In the second possible implementation, combined with the first aspect or the first possible implementation of the first aspect, when the basic decoding method is used to decode the second type of encrypted data packet incorrectly, the second type of encrypted data packet corresponds to In the case of an RLC entity, before the SN of the predicted Class 2 encrypted data packet, it also includes: judging whether the Class 2 encrypted data packet is the concerned type data packet; when the judgment result is that the Class 2 encrypted data packet is the concerned type data Predict the SN corresponding to the known information bits in the second-class encrypted data packet.

In the third possible implementation, combined with the first aspect or the first or second possible implementation of the first aspect, when the basic decoding method is used to decode the second type of encrypted data packet incorrectly, the type When the encrypted data packet is stored corresponding to multiple RLC entities, before predicting the SN of the second type encrypted data packet, it also includes: judging whether the second type encrypted data packet is the concerned type data packet; the judgment result is that the second type encrypted data packet When it is the data packet of the concerned type, select the SN group corresponding to the RLC entity with the highest probability of occurrence in the last receiving time, and then predict the SN corresponding to the known information bit in the second type encrypted data packet.

In the fourth possible implementation manner, in combination with the first aspect or any of the first to third possible implementation manners of the first aspect, the predicting the SN of the second-type encrypted data packet includes: judging the second-type encryption Whether the data packet is newly transmitted; when the judgment result of judging whether the encrypted data packet of the second type is newly transmitted is that the encrypted data packet of the second type is newly transmitted, it is judged that the previous encrypted data of the second type encrypted in the encrypted data packet of the second type Whether the packet is received correctly; when the judgment result of whether the previous class 2 encrypted data packet of the class 2 encrypted data packet is received correctly is that the previous class 2 encrypted data packet is received correctly, the SN is predicted to be the previous class 2 encrypted data packet Add 1 to the SN of the encrypted data packet or predict that the SN is the SN of the previous type II encrypted data packet plus 1 and take the modulus after overflow.

In the fifth possible implementation, combined with the fourth possible implementation of the first aspect, when the judgment result of judging whether the previous Type 2 encrypted data packet of the Type 2 encrypted data packet is received correctly is that the previous A type 2 encrypted data packet is not received correctly, predict the number n of type 2 encrypted data packets between the type 2 encrypted data packet and the previous correctly received type 2 encrypted data packet, and predict the SN of the data packet with known information bits Add the n and then add 1 to the SN of the previous correctly received Type 2 encrypted data packet, or add 1 to the SN of the previous correctly received Type 2 encrypted data packet, add overflow, and then take the modulus.

In the sixth possible implementation, combined with the fourth possible implementation of the first aspect, when the result of judging whether the Type II encrypted data packet is newly transmitted is that the Type II encrypted data packet is not newly transmitted , predicting the SN of the data packet of the known information bit is the last predicted SN of this type of encrypted data packet. 8. The method according to any one of claims 1 to 7, characterized in that, according to the predicted SN, using the encrypted known information bit information in the encrypted data packet of the type 2 to the encrypted data of the second type Decoding the packet includes: selecting a type of encrypted data packet corresponding to the predicted SN; using the known information bit information on the type of encrypted data packet to assist in decoding the second type of encrypted data packet.

In the second aspect, a decoding device is provided, which is characterized in that it includes: a receiving module, configured to obtain a type of encrypted data packet, the type of encrypted data packet is encrypted known information bit information, and the type of encrypted data packet The encrypted data packet is from the RLC layer, and is also used to receive the second type encrypted data packet, and the second type encrypted data packet is from the physical layer of the sending end; the processing module is used to predict the SN of the second type encrypted data packet; the decoding module is used for according to The predicted SN uses the encrypted known information bit information in the type of encrypted data packet to decode the second type of encrypted data packet

In a first possible implementation manner, it further includes: a storage module, configured to store the type-1 encrypted data packet and the type-2 encrypted data packet.

In the second possible implementation, combined with the second aspect or the first possible implementation of the second aspect, the type of encrypted data packet is generated by the RLC layer, including: in the RLC layer entity, based on the RLC entity Each SN in the corresponding SN group generates a cipher stream corresponding to the SN, and uses the cipher stream to encrypt the known information bit information to obtain the encrypted data packet of this type.

In the third possible implementation, combined with the second aspect or the first or second possible implementation of the second aspect, when the basic decoding method is used to decode the second type of encrypted data packet incorrectly, the type When the encrypted data packet corresponds to an RLC entity, it is judged whether the second type encrypted data packet is the concerned type data packet; when the judgment result is that the second type encrypted data packet is the concerned type data packet, the processing module predicts the known information bit of the packet's SN.

In the fourth possible implementation manner, in combination with the second aspect or any of the first to third possible implementation manners of the second aspect, the processing module is further used to, when using the basic decoding method to classify the second The encrypted data packet is decoded incorrectly. When the encrypted data packet of this type corresponds to multiple RLC entities, it is judged whether the encrypted data packet of the second type is the data packet of the concerned type; the judgment result is that the encrypted data packet of the second type is the type of concerned When the data packet is selected, the SN group corresponding to the RLC entity with the highest probability of occurrence in the last receiving time is selected, and the SN corresponding to the known information bit in the second type encrypted data packet is predicted.

In a fifth possible implementation manner, in combination with the second aspect or any one of the first to fourth possible implementation manners of the second aspect, the processing module is further used to determine whether the Type II encrypted data packet is New transmission; when the judgment result of judging whether the encrypted data packet of the second type is newly transmitted is that the encrypted data packet of the second type is newly transmitted, it is judged whether the previous encrypted data packet of the second type encrypted data packet is correctly received ; When the judgment result of whether the previous two encrypted data packets of the two types of encrypted data packets is correctly received is that the previous two encrypted data packets are received correctly, the SN is predicted to be the previous two encrypted data packets Add 1 to the SN or predict that the SN is the SN of the previous Type II encrypted data packet plus 1 and take the modulus after overflow.

In the sixth possible implementation manner, in combination with the second aspect or any one of the first to fifth possible implementation manners of the second aspect, the processing module is further configured to, when judging that the Type II encrypted data packet The result of judging whether the previous Class 2 encrypted data packet was received correctly is that the previous Class 2 encrypted data packet was not received correctly, and it is predicted that there is a difference between the Class 2 encrypted data packet and the previous Class 2 encrypted data packet received correctly. For the number n of encrypted data packets, the SN is predicted to be the SN of the previous correctly received Class II encrypted data packet plus the n plus 1.

In the seventh possible implementation, in combination with the second aspect or any of the first to sixth possible implementations of the second aspect, when judging whether the Type 2 encrypted data packet is a newly transmitted judgment result When the Type II encrypted data packet is not newly transmitted, the predicted SN is the predicted SN of the Type II encrypted data packet last time.

In an eighth possible implementation manner, in combination with the second aspect or any one of the first to seventh possible implementation manners of the second aspect, the decoding module is further configured to select a corresponding to the predicted SN A type of encrypted data packet; using the known information bit information on the type of encrypted data packet to assist in decoding the type II encrypted data packet.

In a third aspect, a decoding device is provided, including: a receiver, configured to obtain a type of encrypted data packet, the type of encrypted data packet is encrypted known information bit information, and the type of encrypted data packet comes from The RLC layer is also used to receive the second type encrypted data packet, which is from the physical layer of the sending end; the processor is used to predict the SN of the second type encrypted data packet, and is also used to utilize the predicted SN according to the predicted SN The encrypted known information bit information in the first-class encrypted data packet decodes the second-class encrypted data packet

In a first possible implementation manner, it further includes: a memory, configured to store the type-1 encrypted data packet and the type-2 encrypted data packet.

In the second possible implementation, combined with the third aspect or the first possible implementation of the third aspect, this type of encrypted data packet is generated by the RLC layer, including: in the RLC layer entity, based on the RLC entity Each SN in the corresponding SN group generates a cipher stream corresponding to the SN, and uses the cipher stream to encrypt the known information bit information to obtain the encrypted data packet of this type.

In the third possible implementation manner, in combination with the third aspect or the first or second possible implementation manner of the third aspect, the processor is further configured to, when using the basic decoding method to decode the second type of encrypted data packet Decoding error, when this type of encrypted data packet corresponds to an RLC entity, judge whether the second type of encrypted data packet is the concerned type data packet; when the judgment result is that the second type encrypted data packet is the concerned type data packet, the The processor predicts the SN of the packet for the known information bits.

In the fourth possible implementation manner, in combination with the third aspect or any of the first to third possible implementation manners of the third aspect, the processor is further configured to, when using the basic decoding method to classify the second The encrypted data packet is decoded incorrectly. When the encrypted data packet of this type corresponds to multiple RLC entities, it is judged whether the encrypted data packet of the second type is the data packet of the concerned type; the judgment result is that the encrypted data packet of the second type is the type of concerned When the data packet is selected, the SN group corresponding to the RLC entity with the highest probability of occurrence in the last receiving time is selected, and the SN corresponding to the known information bit in the second type encrypted data packet is predicted.

In a fifth possible implementation manner, in combination with the third aspect or any one of the first to fourth possible implementation manners of the third aspect, the processor is further configured to determine whether the Type II encrypted data packet is New transmission; when the judgment result of judging whether the encrypted data packet of the second type is newly transmitted is that the encrypted data packet of the second type is newly transmitted, it is judged whether the previous encrypted data packet of the second type encrypted data packet is correctly received ; When the judgment result of whether the previous two encrypted data packets of the two types of encrypted data packets is correctly received is that the previous two encrypted data packets are received correctly, the SN is predicted to be the previous two encrypted data packets Add 1 to the SN or predict that the SN is the SN of the previous Type II encrypted data packet plus 1 and take the modulus after overflow.

In a sixth possible implementation manner, in combination with the third aspect or any one of the first to fifth possible implementation manners of the third aspect, the processor is further configured to, when determining that the Type II encrypted data packet The result of judging whether the previous Class 2 encrypted data packet was received correctly is that the previous Class 2 encrypted data packet was not received correctly, and it is predicted that there is a difference between the Class 2 encrypted data packet and the previous Class 2 encrypted data packet received correctly. For the number n of encrypted data packets, the SN is predicted to be the SN of the previous correctly received Class II encrypted data packet plus the n plus 1.

In the seventh possible implementation, in combination with the third aspect or any of the first to sixth possible implementations of the third aspect, when it is judged whether the Type II encrypted data packet is a newly transmitted judgment result When the Type II encrypted data packet is not newly transmitted, the predicted SN is the predicted SN of the Type II encrypted data packet last time.

In an eighth possible implementation manner, in combination with the third aspect or any one of the first to seventh possible implementation manners of the third aspect, the processor is further configured to select a category corresponding to the predicted SN Encrypted data packets; using the known information bit information on the encrypted data packets of the first type to assist in decoding the encrypted data packets of the second type.

Based on the above technical solution, in order to improve the decoding efficiency of the physical layer, the embodiments of the present invention enable the physical layer to use the encrypted known information bits for decoding, and predict the SN of the second-class encrypted data packet at the physical layer, so that the Find the known information bit in a type of encrypted information corresponding to the SN, and use the information on the known information bit to decode the encrypted data packet. Therefore, the decoding speed is effectively improved, and the decoding performance is improved.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required in the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Fig. 1 is a schematic flowchart of a decoding method according to an embodiment of the present invention.

Fig. 2 is a schematic block diagram of a decoding device according to an embodiment of the present invention;

Fig. 3 is another schematic block diagram of a decoding device according to an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

FIG. 1 shows a schematic flowchart of a decoding method 100 according to an embodiment of the present invention. The method in FIG. 1 is executed at the physical layer. As shown in FIG. 1, the method 100 includes:

S110, obtaining a type of encrypted data packet, the type of encrypted data packet is encrypted known information bit information, and the type of encrypted data packet comes from a radio link control (Radio Link Control, "RLC" for short) layer;

S120, predicting the SN of the second type encrypted data packet, where the second type encrypted data packet comes from the physical layer of the sending end;

S130, according to the predicted SN, use the encrypted known information bit information in the encrypted data packet of the type to decode the encrypted data packet of the second type.

In the embodiment of the present invention, in order to improve the decoding efficiency of the physical layer, the physical layer can use the encrypted known information bits for decoding, and predict the SN of the second type encrypted data packet at the physical layer, so as to find the SN with high probability. The known information bit in a type of encrypted information corresponding to the SN uses the information on the known information bit to decode the encrypted data packet. Therefore, the decoding speed is effectively improved, and the decoding performance is improved.

In S110, a type of encrypted data packet is obtained, which is encrypted known information bit information, and this type of encrypted data packet comes from the RLC layer.

Specifically, the physical layer obtains a type of encrypted data packet obtained during the interaction with the RLC layer, and the encrypted data packet of the type is obtained by encrypting the data packet at the RLC layer. In the data packet, some information bits are fixed, and the fixed information bits are called known information bits.

For a type of encrypted data packet received correctly, the physical layer deletes the encrypted information bit of the known information bit corresponding to the SN of the data packet in the information base of the physical layer.

In this embodiment of the present invention, optionally, before S110, the method 100 further includes:

S140, in the RLC layer entity, generate a cipher stream corresponding to the SN based on each SN in the SN group corresponding to the RLC entity, and use the cipher stream to encrypt the known information bit information to obtain the type of encrypted data packet .

Optionally, S140 includes:

S141. Generate a cipher stream corresponding to the SN for each SN in the SN group corresponding to the RLC entity at the RLC layer.

There may be different RLC entities in the RLC layer, and each RLC entity has its corresponding SN group. Each SN group consists of several SNs. Different RLC entities have different SN groups. Generate a cipher stream corresponding to the SN for each SN in the SN group. This cipher stream is used to encrypt packets.

S142. Use the cipher stream to encrypt known information bits respectively at the RLC layer to generate encrypted known information, where the encrypted known information is the type of encrypted data packet.

At the RLC layer, the cipher stream is used to encrypt the known bit information. There are many encryption methods. For example, the cipher stream is used to XOR the known bit information bit by bit to obtain a type of encrypted data packet after encryption.

In the interactive communication with the physical layer, the RLC layer transmits this type of encrypted data packet to the physical layer in the interactive communication.

In S120, predict the SN of the second-type encrypted data packet, and the second-type encrypted data packet is from the physical layer of the sending end.

Optionally, the Type II encrypted data packet comes from the physical layer of the sending end, and the Type II encrypted data packet is also encrypted at the RLC layer. For the SN of the Type 2 encrypted data packet, the known information bit corresponding to the SN in the Type 1 encrypted data packet of the SN is the same as or corresponding to the known information bit contained in the Type 2 encrypted data packet corresponding to the SN.

Optionally, the S120 includes,

S121. Determine whether the Type 2 encrypted data packet is newly transmitted. In the physical layer, a type of encrypted data packet is transmitted from the RLC layer to the physical layer through the interactive communication between the RLC layer and the physical layer. The second type of encrypted data packet is transmitted from the sending end of the physical layer to the receiving end of the physical layer through the transmission channel, and is decoded at the receiving end. The first-class encrypted data packet and the second-class encrypted data packet contain the same known bits. Since the second-class encrypted data packet passes through the transmission channel, it may receive interference from noise and other factors and cause errors. It is also possible to use the known bits in the first-class encrypted data packet Known information bits, to decode the second type of encrypted data packets.

The physical layer of the sending end sends the Type 2 encrypted data packet to the receiving end, and when the Type 2 encrypted data packet fails to be received, the sending end resends the Type 2 encrypted data packet that failed to be received. For the receiving end of the physical layer, when the received Type 2 encrypted data packet is not retransmitted, that is, the Type 2 encrypted data packet is received for the first time, and the Type 2 encrypted data packet is newly transmitted.

At the receiving end of the physical layer, the receiving status of the Type 2 encrypted data packet received by the receiving end is stored, and the receiving status indicates whether the received Type 2 encrypted data packet is successfully received. According to the indication information, when the received If the Type 2 data packet is not recorded as receiving failure at the receiving end, it can be judged that the Type 2 encrypted data packet is newly transmitted; when the received Type 2 data packet is recorded as receiving failure at the receiving end, it can be judged that the Type 2 encrypted data packet is Packets are retransmissions, not new transmissions.

Optionally, S120 also includes,

S122a, in S121, when judging whether the second type of encrypted data packet is a newly transmitted judgment result is that the second type of encrypted data packet is not newly passed on, predicting that the SN of the second type of encrypted data packet is the last time to the second type of encrypted data packet Predict SN.

When the Type II encrypted data packet is not newly transmitted, it indicates that the encrypted data packet failed to be transmitted to the receiving end of the physical layer for the first time, so the sending end resends the Type II encrypted data packet, and the receiving end of the physical layer receives the second type encrypted data packet for the first time. The second type of encrypted data packet has been predicted SN during the class encrypted data packet, and the prediction step refers to step S120. The SN of the data packet with known information bits is the last predicted SN of the second type encrypted data packet.

Optionally, S120 also includes,

S122b. When judging in S121 whether the Type 2 encrypted data packet is newly transmitted, if the judgment result is that the Type 2 encrypted data packet is newly transmitted, determine whether the previous data packet of the Type 2 encrypted data packet is received correctly.

Optionally, S120 also includes,

S123a, in S122b, judge the previous data packet of this encrypted data packet, when the judging result of whether the previous data packet of this encrypted data packet is received correctly is that the previous data packet of this encrypted data packet is received correctly, predict the previous data packet of this encrypted data packet The SN is the SN of the previous data packet plus 1 or the SN of the previous data packet is plus 1 and the modulus is taken after overflow.

Optionally, S120 also includes,

S123b, in S122b, judge the previous second type data packet of the second type encrypted data packet, when the judgment result of whether the previous second type data packet of the second type encrypted data packet is correctly received is the preceding type of the encrypted data packet A second type of data packet is not received correctly, predict the number n of SNs between the encrypted data packet and the previous correctly received second type of data packet, and predict that the SN is the previous correctly received second type of data packet SN plus the Add n plus 1 or add 1 to the SN of the previous correctly received Class II encrypted data packet and take the modulo after adding overflow.

In the embodiment of the present invention, optionally, when predicting for the first time, if there is no previous Class II data packet or the previous correctly received Class II encrypted data packet, the previous Class II data packet The SN of the packet is 0 or the SN of the previous Class 2 encrypted data packet received correctly is 0.

In this embodiment of the present invention, optionally, before S120, the method 100 further includes:

S150. When the encrypted data packet comes from an RLC entity, judge whether the encrypted data packet is a concerned type data packet; if the judgment result is that the encrypted data packet is a concerned type data packet, predict the SN.

The attention-type data packet refers to a data packet containing abundant known bit information in the data packet, such as a TCPACK packet, or a data packet in which additional information bits are added to the data and has known bit information. The concerned type data packet is the data packet to be encrypted,

At present, the air interface of the TCPACK packet in the live network is 354 bits, and it is judged whether it is a concerned type of data packet according to the size of the data packet. For the received data packet, if the size of the data packet is 354 bits, when the basic decoding algorithm fails, auxiliary decoding can be performed on it.

According to the analysis of the live network data, 32bytes and 44bytes will appear in the TCP header. At this time, the entire TCP ACK will be split into two 354bits packets, and the second packet is composed of the remaining information of the TCP header and additional information bits. For a 354bits data packet that needs auxiliary decoding, if the predicted SN of the data packet is the SN of the first packet of a correctly received TCP ACK plus 1, the known information of the data packet is considered to be TCP The known information in the second data packet of the ACK packet, otherwise, the known information of the data packet is the known information in the first data packet of the TCP ACK packet.

In this embodiment of the present invention, optionally, before S120, the method 100 further includes:

S160, when the encrypted data comes from multiple RLC entities, before predicting the SN of the data packet of the known information bit in the encrypted data packet, further include:

Select the RLC entity with the highest probability of appearing within the last receiving time, where the last receiving time can be selected according to specific application scenarios.

Judging whether the encrypted data packet is a concerned type data packet; if the judgment result is that the encrypted data packet is a concerned type data packet, predicting the SN.

The attention-type data packet refers to a data packet containing abundant known bit information in the data packet, such as a TCPACK packet, or a data packet in which additional information bits are added to the data and has known bit information. The concerned type data packet is the data packet to be encrypted,

At present, the air interface of the TCP ACK packet in the live network is 354 bits, and it is judged whether it is a concerned type of data packet according to the size of the data packet. For the received data packet, if the size of the data packet is 354 bits, when the basic decoding algorithm fails, auxiliary decoding can be performed on it.

According to the analysis of live network data, 32bytes and 44bytes will appear in the TCP header. At this time, the entire TCPACK will be split into two 354bits packets, and the second packet is composed of the remaining information of the TCP header and additional information bits. For a 354bits data packet that needs auxiliary decoding, if the predicted SN of the data packet is the SN of the first packet of a correctly received TCP ACK plus 1, the known information of the data packet is considered to be TCP ACK The known information in the second data packet of the TCPACK packet, otherwise, the known information in the data packet is the known information in the first data packet of the TCPACK packet.

When the judgment result is that the encrypted data packet is the TCP ACK and/or has additional information bits, predict the SN. The prediction step is as described in S120 and will not be repeated here.

When the prediction is wrong, data packets corresponding to other RLC entities may be selected one by one.

S130, according to the predicted SN, use the encrypted known information bit information in the encrypted data packet of the type to decode the encrypted data packet of the second type.

Optionally, S130 includes,

S131. Select the known information bit encryption information of a type of encrypted data packet corresponding to the predicted SN in step S120.

Optionally, S130 includes,

S132. Use the encrypted information on the known information bit to perform auxiliary decoding on the encrypted data packet.

Auxiliary decoding is decoding using known information bits, optionally,

Before the demodulated Log Likelihood Ratio ("LLR") result is sent to the decoder, the bit identified as known information is mapped to the infinite value of the corresponding polarity of the demodulated LLR or a set value A saturation value, add or replace this value to the systematic bit corresponding to the demodulated LLR.

Optionally, inside the decoder, the bit identified as known information is mapped to an infinite value corresponding to the polarity of the demodulated LLR or a certain saturation value set, and this value is added or replaced to the corresponding system bit On the extrinsic information, this replacement or addition process can be performed every time the component decoder decodes, or it can initialize the prior information before the decoding starts.

In the embodiment of the present invention, in order to improve the decoding efficiency of the physical layer, the physical layer can use the encrypted known information bits for decoding, and predict the SN of the second type encrypted data packet at the physical layer, so as to find the SN with high probability. The known information bit in a type of encrypted information corresponding to the SN uses the information on the known information bit to decode the encrypted data packet. Therefore, the decoding speed is effectively improved, and the decoding performance is improved.

It should be understood that in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of each process should be determined by its functions and internal logic, rather than by the embodiment of the present invention. The implementation process constitutes any limitation.

Fig. 2 shows a schematic block diagram of a decoding device 200 according to an embodiment of the present invention. The device disclosed in FIG. 2 and its description can be based on FIG. 1 of the embodiment of the present invention and the decoding method disclosed in FIG. 1 of the embodiment of the present invention.

The decoding device 200 according to the embodiment of the present invention may correspond to the decoding method according to the embodiment of the present invention, and the above-mentioned and other operations and/or functions of each module in the decoding device 200 are to realize each For the sake of brevity, the corresponding flow of the method will not be repeated here.

As shown in Figure 2, the decoding device includes:

The receiving module is used to obtain a type of encrypted data packet, which is encrypted known information bit information, and the type of encrypted data packet comes from the RLC layer, and is also used to receive a type of encrypted data packet, which The encrypted data packet comes from the physical layer of the sender;

A processing module, used to predict the SN of the second class encrypted data packet;

The decoding module is used for decoding the encrypted data packet of the second type by using the encrypted known information bit information in the encrypted data packet of the type according to the predicted SN.

Optionally, the decoding device may further include a storage module, configured to store the type-1 encrypted data packet and the type-2 encrypted data packet.

Optionally, this type of encrypted data packet is generated by the RLC layer, including:

In the RLC layer entity, based on each SN in the SN group corresponding to the RLC entity, a cipher stream corresponding to the SN is generated, and the known information bit information is encrypted with the cipher stream to obtain this type of encrypted data packet.

Optionally, the processing module is further used to judge whether the encrypted data packet of the second type is the attention when decoding the encrypted data packet of the second type by the basic decoding method is wrong, and the encrypted data packet of the type corresponds to an RLC entity. type packet;

When the judging result is that the encrypted data packet of the second type is the data packet of the concerned type, the processing module predicts the SN of the data packet of the known information bit.

Optionally, the processing module is further used to judge whether the encrypted data packet of the second type is decoded incorrectly when the encrypted data packet of the second type is stored corresponding to multiple RLC entities in the basic decoding mode. The concerned type data packet; when the judgment result is that the second type of encrypted data packet is the concerned type of data packet, select the SN group corresponding to the RLC entity with the largest occurrence probability in the last receiving time, and predict the second type of encrypted data packet The SN corresponding to the known information bit in .

Optionally, the processing module is further used to determine whether the Type II encrypted data packet is newly transmitted;

When the judging result of judging whether the Type 2 encrypted data packet is newly transmitted is that the Type 2 encrypted data packet is newly transmitted, it is judged whether the previous Type 2 encrypted data packet of the Type 2 encrypted data packet is received correctly.

When it is judged whether the previous two encrypted data packets of the second type encrypted data packets are received correctly, the judgment result is that the previous two encrypted data packets are received correctly, and the SN is predicted to be the previous two encrypted data packets. Add 1 to the SN or predict that the SN is the SN of the previous Type II encrypted data packet plus 1 and take the modulus after overflow.

Optionally, the processing module is further used to predict whether the previous Type 2 encrypted data packet of the Type 2 encrypted data packet is received correctly as a result of judging whether the previous Type 2 encrypted data packet has not been received correctly. The number n of Type 2 encrypted data packets between the Type 2 encrypted data packet and the previous correctly received Type 2 encrypted data packet, and the predicted SN is the SN of the previous correctly received Type 2 encrypted data packet plus the n plus 1 .

Optionally, when the result of judging whether the Type II encrypted data packet is newly transmitted is that the Type II encrypted data packet is not newly transmitted, the predicted SN is the last predicted SN of the Type II encrypted data packet.

Optionally, the decoding module is further used to select a type of encrypted data packet corresponding to the predicted SN;

The known information bit information on the encrypted data packet of the first type is used to assist in decoding the encrypted data packet of the second type. The steps of assisting in decoding can refer to the description in S130 in the method embodiment of the present invention, and will not be repeated here.

The decoding device 200 disclosed in the embodiment of the present invention may be located in various devices including a base station at the physical layer, or different modules may be located in devices with different physical layers, which is not limited in the present invention.

In the embodiment of the present invention, in order to improve the decoding efficiency of the physical layer, the physical layer can use the encrypted known information bits for decoding, and predict the SN of the second type of encrypted data packet at the physical layer, so as to find the SN with high probability. The known information bit in a type of encrypted information corresponding to the SN uses the information on the known information bit to decode the encrypted data packet. Therefore, the decoding speed is effectively improved, and the decoding performance is improved.

Fig. 3 shows a schematic block diagram of a decoding device 300 according to an embodiment of the present invention. The device disclosed in FIG. 3 and its description may be based on FIG. 1 of the embodiment of the present invention and the decoding method disclosed in FIG. 1 of the embodiment of the present invention, as well as the device disclosed in FIG. 2 .

The decoding device 300 according to the embodiment of the present invention may correspond to the decoding method according to the embodiment of the present invention, and the above-mentioned and other operations and/or functions of each device in the decoding device 300 are respectively in order to realize each For the sake of brevity, the corresponding flow of the method will not be repeated here.

As shown in Figure 3, the decoding device includes:

The receiver is used to obtain a type of encrypted data packet, the type of encrypted data packet is encrypted known information bit information, the type of encrypted data packet comes from the RLC layer, and is also used to receive a type of encrypted data packet, the second type of encrypted data packet The encrypted data packet comes from the physical layer of the sender;

The processor is used to predict the SN of the second type of encrypted data packet, and is also used to decode the second type of encrypted data packet by using the encrypted known information bit information in the type of encrypted data packet according to the predicted SN .

Optionally, the decoding device may further include a memory for storing the type-1 encrypted data packet and the type-2 encrypted data packet.

Optionally, this type of encrypted data packet is generated by the RLC layer, including:

In the RLC layer entity, based on each SN in the SN group corresponding to the RLC entity, a cipher stream corresponding to the SN is generated, and the known information bit information is encrypted with the cipher stream to obtain this type of encrypted data packet.

Optionally, the processor is further used to judge whether the encrypted data packet of the second type is the attention when the encrypted data packet of the second type is decoded incorrectly by the basic decoding method, and the encrypted data packet of the type corresponds to an RLC entity. type packet;

When the judging result is that the encrypted data packet of the second type is the data packet of the concerned type, the processor predicts the SN of the data packet of the known information bit.

Optionally, the processor is further used to judge whether the encrypted data packet of the second type is a The concerned type data packet; when the judgment result is that the second type of encrypted data packet is the concerned type of data packet, select the SN group corresponding to the RLC entity with the largest occurrence probability in the last receiving time, and predict the second type of encrypted data packet The SN corresponding to the known information bit in .

Optionally, the processor is further used to determine whether the Type II encrypted data packet is newly transmitted;

When the judging result of judging whether the Type 2 encrypted data packet is newly transmitted is that the Type 2 encrypted data packet is newly transmitted, it is judged whether the previous Type 2 encrypted data packet of the Type 2 encrypted data packet is received correctly.

When it is judged whether the previous two encrypted data packets of the second type encrypted data packets are received correctly, the judgment result is that the previous two encrypted data packets are received correctly, and the SN is predicted to be the previous two encrypted data packets. Add 1 to the SN or predict that the SN is the SN of the previous Type II encrypted data packet plus 1 and take the modulus after overflow.

Optionally, the processor is further configured to predict the The number n of Type 2 encrypted data packets between the Type 2 encrypted data packet and the previous correctly received Type 2 encrypted data packet, and the predicted SN is the SN of the previous correctly received Type 2 encrypted data packet plus the n plus 1 .

Optionally, when the result of judging whether the Type II encrypted data packet is newly transmitted is that the Type II encrypted data packet is not newly transmitted, the predicted SN is the last predicted SN of the Type II encrypted data packet.

Optionally, the processor is further used to select a type of encrypted data packet corresponding to the predicted SN; use the known information bit information on the type of encrypted data packet to assist in decoding the second type of encrypted data packet . The steps of assisting in decoding can refer to the description in S130 in the method embodiment of the present invention, and will not be repeated here.

The decoding device 300 disclosed in the embodiment of the present invention may be located in various devices including a base station at the physical layer, or different devices may be located in different devices at the physical layer, which is not limited in the present invention.

In the embodiment of the present invention, in order to improve the decoding efficiency of the physical layer, the physical layer can use the encrypted known information bits for decoding, and predict the SN of the second type encrypted data packet at the physical layer, so as to find the SN with high probability. The known information bit in a type of encrypted information corresponding to the SN uses the information on the known information bit to decode the encrypted data packet. Therefore, the decoding speed is effectively improved, and the decoding performance is improved.

It should be understood that in the embodiments of the present invention, the term "and/or" is only an association relationship describing associated objects, indicating that there may be three relationships. For example, A and/or B may mean that A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the relationship between hardware and software Interchangeability. In the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, and will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, and may also be electrical, mechanical or other forms of connection.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of software products, and the computer software products are stored in a storage medium In, several instructions are included to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc., which can store program codes. .

The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can easily think of various equivalents within the technical scope disclosed in the present invention. Modifications or replacements shall all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (26)

1. A decoding method, characterized in that, comprising: Obtain a type of encrypted data packet, the type of encrypted data packet is encrypted known information bit information, and the type of encrypted data packet comes from the radio link control RLC layer; Predict the serial number SN of the second type encrypted data packet, the second type encrypted data packet comes from the physical layer of the sending end; According to the predicted SN, the encrypted data packet of the second type is decoded by using the encrypted known information bit information in the encrypted data packet of the first type. 2. The method according to claim 1, wherein, before the acquisition of a class of encrypted data packets, the method further comprises: In the RLC layer entity, based on each SN in the SN group corresponding to the RLC entity, a cipher stream corresponding to the SN is generated, and the cipher stream is used to encrypt the known information bit information to obtain the type of encryption data pack. 3. The method according to claim 1 or 2, characterized in that, when using the basic decoding method to decode the second type of encrypted data packet incorrectly, and when the second type of encrypted data packet corresponds to an RLC entity, the prediction two Before the SN of the encrypted data packet, it also includes: judging whether the encrypted data packet of the second type is the data packet of the concerned type; When the judgment result is that the Type 2 encrypted data packet is the concerned type data packet, predict the SN corresponding to the known information bits in the Type 2 encrypted data packet. 4. according to the described method of the described method of claim 1 or 2, it is characterized in that, when using basic decoding mode to two types of encrypted data packet decoding errors, described one type of encrypted data packet is stored corresponding to a plurality of RLC entities When, before the SN of the predicted second-class encrypted data packet, it also includes: judging whether the second type encrypted data packet is the concerned type data packet; When the judgment result is that the Type 2 encrypted data packet is the concerned type data packet, the SN group corresponding to the RLC entity with the highest probability of occurrence in the last receiving time is selected to predict the Type 2 encrypted data packet The SN corresponding to the known information bits in . 5. The method according to any one of claims 1 to 4, wherein the prediction of the SN of the second type of encrypted data packet comprises: Judging whether the second type encrypted data packet is newly transmitted; When the judgment result of judging whether the encrypted data packet of the second type is a new transmission is that the encrypted data packet of the second type is a new transmission, it is judged whether the encrypted data packet of the second type is correct before the encrypted data packet of the second type take over; When the judgment result of judging whether the previous type 2 encrypted data packet of the type 2 encrypted data packet is received correctly is that the previous type 2 encrypted data packet is received correctly, predicting that the SN is the previous type 2 encrypted data packet Adding 1 to the SN of the class-2 encrypted data packet or predicting that the SN is the SN of the previous class-2 encrypted data packet plus 1 and taking the modulus after overflow. 6. The method according to claim 5, characterized in that, when the judgment result of whether the previous Class II encrypted data packet of the Class II encrypted data packet is correctly received is that the previous Class II encrypted data packet is The data packet is not correctly received, predicting the number n of the second type of encrypted data packets between the second type of encrypted data packet and the previous correctly received second type of encrypted data packet, and predicting that the SN of the data packet of the known information bit is all The SN of the previous correctly received Type II encrypted data packet is added to the n plus 1, or the SN of the previous correctly received Type II encrypted data packet is added to the above n plus 1, and the modulus is taken after overflow. 7. The method according to claim 5, characterized in that, when the result of judging whether the Class II encrypted data packet is newly transmitted is that the Class II encrypted data packet is not newly transmitted, predicting that the encrypted data packet of the second type is not newly transmitted. The SN of the data packet with known information bits is the last predicted SN of the type of encrypted data packet. 8. The method according to any one of claims 1 to 7, characterized in that, according to the predicted SN, using the encrypted known information bit information pair in the one type of encrypted data packet Deciphering the second type of encrypted data packet includes: Select a class of encrypted data packets corresponding to the predicted SN; Using the known information bit information on the encrypted data packet of the first type to perform auxiliary decoding on the encrypted data packet of the second type. 9. A decoding device, characterized in that it comprises: The receiving module is used to obtain a type of encrypted data packet, the type of encrypted data packet is encrypted known information bit information, the type of encrypted data packet is from the RLC layer, and is also used to receive the type II encrypted data packet, The second type of encrypted data packet comes from the physical layer of the sending end; A processing module, used to predict the SN of the second class encrypted data packet; The decoding module is configured to decode the encrypted data packet of the second type by using the encrypted known information bit information in the encrypted data packet of the first type according to the predicted SN. 10. The device according to claim 9, further comprising: A storage module, configured to store the type-1 encrypted data packet and the type-2 encrypted data packet. 11. The device according to claim 9 or 10, wherein said type of encrypted data packet is generated by the RLC layer, comprising: In the RLC layer entity, based on each SN in the SN group corresponding to the RLC entity, a cipher stream corresponding to the SN is generated, and the cipher stream is used to encrypt the known information bit information to obtain the type of encryption data pack. 12. The device according to any one of claims 9 to 11, wherein the processing module is further configured to, when the basic decoding method is used to decode the second type of encrypted data packet incorrectly, the first type of encryption When the data packet corresponds to an RLC entity, it is judged whether the second type encrypted data packet is the concerned type data packet; When the judging result is that the Type II encrypted data packet is the concerned type data packet, the processing module predicts the SN of the data packet of the known information bit. 13. The device according to any one of claims 9 to 12, wherein the processing module is further configured to, when the basic decoding method is used to decode the second type of encrypted data packet incorrectly, the first type of encryption When the data packet corresponds to multiple RLC entities, judging whether the second type encrypted data packet is the concerned type data packet; The result of the judgment is that when the Type II encrypted data packet is the concerned type data packet, select the SN group corresponding to the RLC entity with the highest probability of occurrence in the last receiving time, and predict the type of encrypted data packet in the Type II encrypted data packet The SN corresponding to the known information bit. 14. The device according to any one of claims 9 to 13, wherein the processing module is further used for: Judging whether the second type encrypted data packet is newly transmitted; When the judgment result of judging whether the encrypted data packet of the second type is a new transmission is that the encrypted data packet of the second type is a new transmission, it is judged whether the encrypted data packet of the second type is correct before the encrypted data packet of the second type take over; When the judgment result of judging whether the previous type 2 encrypted data packet of the type 2 encrypted data packet is received correctly is that the previous type 2 encrypted data packet is received correctly, predicting that the SN is the previous type 2 encrypted data packet Adding 1 to the SN of the class-2 encrypted data packet or predicting that the SN is the SN of the previous class-2 encrypted data packet plus 1 and taking the modulus after overflow. 15. The device according to any one of claims 9 to 14, wherein the processing module is further configured to, when determining that the previous Type 2 encrypted data packet of the Type 2 encrypted data packet Whether the judgment result of correct reception is that the previous Class II encrypted data packet was not received correctly, and the number n of Class II encrypted data packets between the Class II encrypted data packet and the previous correctly received Class II encrypted data packet is predicted, Predicting that the SN is the SN of the previous correctly received Type 2 encrypted data packet plus the n plus 1 or the SN of the previous correctly received Type 2 encrypted data packet plus the n plus 1 and adding Modulo after overflow. 16. The device according to any one of claims 9 to 15, wherein when the result of judging whether the Type II encrypted data packet is newly transmitted is that the Type II encrypted data packet is not newly transmitted , the predicted SN is the last predicted SN for the Type II encrypted data packet. 17. The device according to any one of claims 9 to 16, wherein the decoding module is further used for: Select a class of encrypted data packets corresponding to the predicted SN; Using the known information bit information on the encrypted data packet of the first type to perform auxiliary decoding on the encrypted data packet of the second type. 18. A decoding device, characterized in that it comprises: The receiver is used to obtain the first type of encrypted data packet, the first type of encrypted data packet is encrypted known information bit information, the first type of encrypted data packet is from the RLC layer, and is also used to receive the second type of encrypted data packet An encrypted data packet, the second type of encrypted data packet is from the physical layer of the sending end; The processor is configured to predict the SN of the encrypted data packet of the second type, and is further configured to use the encrypted known information bit information in the encrypted data packet of the first type to Encrypted packets are decoded. 19. The apparatus of claim 18, further comprising: A memory, configured to store the first type of encrypted data packet and the second type of encrypted data packet. 20. The device according to claim 18 or 19, wherein the first type of encrypted data packet is generated by the RLC layer, comprising: In the RLC layer entity, based on each SN in the SN group corresponding to the RLC entity, a cipher stream corresponding to the SN is generated, and the cipher stream is used to encrypt the known information bit information to obtain the first type Encrypted packets. 21. The device according to any one of claims 18 to 20, wherein the processor is further configured to, when the second type of encrypted data packet is decoded incorrectly in a basic decoding manner, the first When the type encrypted data packet corresponds to an RLC entity, it is judged whether the second type encrypted data packet is the concerned type data packet; When the judgment result is that the encrypted data packet of the second type is the data packet of the concerned type, the processor predicts the SN of the data packet of the known information bit. 22. The device according to any one of claims 18 to 21, wherein the processor is further configured to, when the second type of encrypted data packet is decoded incorrectly in a basic decoding manner, the first When the encrypted data packet corresponds to multiple RLC entities, judging whether the encrypted data packet of the second type is the data packet of the concerned type; The judgment result is that when the encrypted data packet of the second type is the data packet of the concerned type, select the SN group corresponding to the RLC entity with the highest probability of occurrence within the receiving time in the previous section, and predict the encrypted data of the second type The SN corresponding to the known information bits in the packet. 23. The device according to any one of claims 18 to 22, wherein the processor is further configured to, Judging whether the second type of encrypted data packet is newly transmitted; When the judgment result of judging whether the encrypted data packet of the second type is newly transmitted is that the encrypted data packet of the second type is newly transmitted, it is judged that the previous encrypted data packet of the second type is encrypted Whether the data packet is received correctly; When the judgment result of judging whether the previous encrypted data packet of the second type of the encrypted data packet of the second type is correctly received is that the previous encrypted data packet of the second type is received correctly, predicting that the SN is the Adding 1 to the SN of the previous encrypted data packet of the second type or predicting that the SN is incremented by 1 to the SN of the previous encrypted data packet of the second type and taking a modulo after adding overflow. 24. The device according to any one of claims 18 to 23, wherein the processor is further configured to, when determining whether the previous second-type encryption of the second-type encrypted data packet The judgment result of whether the data packet is received correctly is that the previous encrypted data packet of the second type has not been received correctly, and the second encrypted data packet between the encrypted data packet of the second type and the encrypted data packet of the second type received correctly is predicted The number n of data packets, predicting that the SN is the SN of the previous correctly received encrypted data packet of the second type plus the n plus 1 or the SN of the previously correctly received encrypted data packet of the second type plus Add 1 to the n and take the modulus after overflow. 25. The device according to any one of claims 18 to 24, wherein when the result of judging whether the encrypted data packet of the second type is newly transmitted is that the encrypted data packet of the second type is not In new transmission, the predicted SN is the last predicted SN of the second type of encrypted data packet. 26. The device according to any one of claims 18 to 25, wherein the processor is further configured to, Selecting the first type of encrypted data packet corresponding to the predicted SN; Auxiliary decoding is performed on the encrypted data packet of the second type by using the known information bit information on the encrypted data packet of the first type.

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