CN101001127A - Equipment and method of correcting and coding for transmission information - Google Patents

Abstract

A method for a base station to perform CRC check and encoding processing on transmitted information, comprising the following steps: the base station processes CRC check information for information of each user equipment respectively; Connected to form one or more information blocks; the base station encodes the information blocks obtained by concatenation. With the method of the present invention, when the base station encodes the information for multiple user equipments in one information block, it adds CRC to the specific information of each user equipment respectively; The CRC check is performed on each block, but the CRC check is performed on each information block for a specific user equipment. An error in an information block for a specific user equipment among the information blocks containing multiple user equipment information will not affect the user equipment's ability to perform a CRC check. Other information blocks are processed for specific user equipment, so that the reliability of information transmission is greatly improved.

Description

Apparatus and method for checking and encoding transmitted information

technical field

The present invention relates to a device and method for checking and encoding transmission information, and more specifically relates to a device and method for collectively encoding information blocks of multiple users and performing verification on individual user equipment information .

Background technique

In the process of information transmission, the signal will be subject to various forms of interference during transmission, resulting in errors in data transmission. In order to combat the errors that occur in the signal transmission process caused by various channel imperfect factors, one technology is error detection code technology, which introduces redundant information by encoding information bits at the sending end, and then can be decoded at the receiving end according to Redundant information judges whether the information block is transmitted correctly. Cyclic redundancy check (CRC), as an error detection code technology, has been widely used; another technology uses error correction code technology, that is, through Redundant information is introduced into the information bit encoding, and then some transmission errors can be automatically found and corrected according to the redundant information when decoding at the receiving end. These two technologies are often used at the same time and complement each other, that is, when there are not too many errors, some errors can be corrected by the error-correcting code; when there are too many errors that exceed the error-correcting capability of the error-correcting code, the error-detecting code can be used to judge the error of the information block.

In a traditional communication system, when a base station needs to send information to multiple user equipments, there are two types of information sending methods:

1) The base station encodes and sends information of each user equipment on mutually independent resources, and the user equipment receives and sends information on each independent resource;

2) The base station gathers the information sent to multiple user equipments into one information block, adds CRC, and then encodes it. The user equipment needs to correctly receive the information block containing the information of multiple user equipments, and then extract the information sent thereto.

For the second method, when the base station gathers the information sent to multiple user equipments into one information block and encodes it, Fig. 1 is a flow chart of the base station processing. As shown in the figure, the base station first concatenates the information blocks of multiple user equipments to form an information block (101); then the base station calculates the CRC for the information blocks formed by the concatenation, and adds the calculated CRC to the concatenated information block. The following information block constitutes a transmission information block (102); the base station encodes the information block added with CRC (103). Fig. 2 is a flowchart of user equipment processing. As shown in the figure, the user equipment first receives a signal from the base station, and decodes on the corresponding resource to obtain an information block containing multiple user equipment information (201); next, the user equipment decodes the decoded information block containing multiple user equipment information If the CRC check fails, the user equipment thinks that the entire data packet is sent incorrectly, and the user equipment discards the data packet (203); if the CRC check passes, the user equipment thinks that this contains multiple user The information block of device information is received correctly (204); the user equipment checks whether its own user equipment ID is contained in the information block containing multiple user equipment information, so as to determine whether the base station has sent information for it (205).

In the HSDPA system, the downlink shared control channel for different user equipments is sent with different codewords, that is to say, the downlink shared control information of different user equipments is sent with independent resources, that is, the first method above is used.

In systems such as IEEE802.16, the downlink control information is sent in the control information field at the front of a frame, and CRC is added to the control information for each user equipment, that is, the second method above is used.

In the prior art, the coding gain of the first method mentioned above is smaller than that of the second method. At the same time, the second method mentioned above has the following problems:

1) Since the base station sends information blocks for multiple users in the same coding block, the number of bits in the coding block is large, and the possibility of CRC check failure will increase after being decoded on the user equipment side through wireless channel transmission , and once the CRC check fails, the user equipment can only consider that the entire information block is sent incorrectly. For a user equipment located in a location with relatively poor channel conditions, the reliability of receiving control signaling is greatly reduced.

2) When the number of users is relatively small, the proportion of the number of bits added to the last CRC in the total number of bits increases, and the bit overhead is relatively large;

Contents of the invention

The invention aims at the problems existing in the existing method, and proposes a device and a method for checking and encoding transmission information.

According to one aspect of the present invention, a method for a base station to perform CRC check and encoding processing on transmitted information includes the following steps:

a) The base station processes the CRC check information for the information of each user equipment respectively;

b) The base station concatenates the transmitted information blocks processed for each user equipment;

c) The base station codes the concatenated information blocks.

According to another aspect of the present invention, a method for user equipment to decode transmitted information and process CRC checks includes the following steps:

a) The user equipment receives the signal of the base station, and decodes it on the corresponding resource to obtain an information block containing information sent to multiple user equipments;

b) The user equipment sequentially checks each information block for a specific user equipment among the information blocks containing multiple user equipment information, and uses its own user equipment ID to check whether it is sent to itself.

According to another aspect of the present invention, a base station performs CRC check processing and encoding equipment for transmitted information, including

A module for calculating and processing the CRC of user information, used to calculate the CRC of user information, and reduce the number of bits through processing;

The cascading module is used to concatenate the user information added with verification information and directly input it to the encoding module.

According to another aspect of the present invention, a user equipment decodes transmitted information and performs CRC check processing, including

The segmentation module is used for the user equipment to split the decoded information blocks containing multiple user equipment information into information blocks for specific user equipments;

The verification module is used for the user equipment to verify each received information block for a specific user equipment according to its own user equipment ID and other information;

The detection and processing module is used for the user equipment to judge whether the base station sends information for it, and to perform corresponding processing.

With the method of the present invention, when the base station encodes the information for multiple user equipments in one information block, it adds CRC to the specific information of each user equipment respectively; The CRC check is performed on each block, but the CRC check is performed on each information block for a specific user equipment. An error in an information block for a specific user equipment among the information blocks containing multiple user equipment information will not affect the user equipment's ability to perform a CRC check. Other information blocks are processed for specific user equipment, so that the reliability of information transmission is greatly improved.

Description of drawings

Fig. 1 is the flowchart of base station processing in the existing method;

FIG. 2 is a flowchart of user equipment processing in an existing method;

FIG. 3 is a device diagram in which the base station adds CRC and joint coding to user equipment information respectively;

Figure 4 is a device diagram of a user equipment detecting and processing information from an information block containing a plurality of user equipment information;

Fig. 5 is a flow chart example of adding CRC and joint coding to user equipment information respectively by the base station;

FIG. 6 is an example flow diagram of user equipment detecting and processing information from an information block containing a plurality of user equipment information;

Figure 7 is an example of a hardware block diagram of a base station transmitter;

Figure 8 is an example of a hardware block diagram of a user equipment receiver;

FIG. 9 is a method for processing specific user information by the base station when the user equipment ID is equal to the length of the CRC;

FIG. 10 is a method for the base station to repeatedly process specific user information on the user equipment ID;

FIG. 11 is a method for a base station to process specific user information by encoding and puncturing user equipment IDs.

Detailed ways

The invention proposes a method for checking and encoding transmission information. Its specific operation is as follows:

base station operation

1) The base station respectively generates and adds CRC check information for each user equipment information;

2) The base station concatenates the transmission information blocks obtained after processing the transmission information for each user equipment to form one or more information blocks;

3) The base station codes the information blocks obtained through concatenation.

The CRC check information generated and added in the above step 1) of the present invention can be processed with other user equipment specific information (such as: user equipment ID) to reduce the number of bits of information to be sent.

In the above steps 2) and 3) of the present invention, a method is that the base station concatenates the transmission information blocks of the user equipment added with CRC information into one information block and encodes it.

In the above steps 2) and 3) of the present invention, another method is that the base station divides the user equipment into multiple groups according to factors such as user equipment channel conditions, so that for each group of user equipment, the base station divides the user equipment with CRC information The sent information blocks are concatenated into one information block and encoded.

Operation of User Equipment

1) The user equipment receives the signal of the base station, and decodes on the corresponding resource to obtain one or more information blocks containing information of multiple user equipments;

2) The user equipment sequentially checks each information block for a specific user equipment among the information blocks containing multiple user equipment information, and uses its own user equipment ID to determine whether it is sent to itself.

In the above step 2) of the present invention, one way for the user equipment to determine that the base station has sent information to it is that if the user equipment passes the verification of an information block for a specific user equipment, the user equipment considers that the information block is sent to own, and stop the verification operation on other information blocks for specific user equipment;

In the present invention, in the above step 2), another way for the user equipment to determine that the base station has sent information for it is that the user equipment checks all information blocks for a specific user equipment:

1) If the user equipment only finds that an information block has passed the verification, the user equipment considers that the information block is sent to itself;

2) If the user equipment finds that multiple information blocks have passed the verification, one processing method is that the user equipment thinks that the information sent by the base station is wrong; another processing method is that the user equipment further analyzes whether the information blocks that have passed the verification are correct according to other conditions. For example, when the information sent by the base station is control signaling, the user equipment checks information such as the format of the transport block and the allocated resources in the information block. When the information matches its processing capability, the user equipment considers this information Blocks are sent to themselves.

In the above step 2) of the present invention, the method for the user equipment to determine that the base station has not sent information for it is that if the user equipment has detected all information blocks for a specific user equipment in the information blocks containing multiple user equipment information, When the information block passed the CRC check, the user equipment considers that the base station has not sent information for it.

Fig. 3 is an equipment diagram of the base station adding CRC and joint coding to user equipment information in the present invention. As shown in the figure, the base station calculates CRC information respectively for user information (301, 302); and performs appropriate processing (303, 304) on the user information and the calculated CRC; then the base station concatenates the processed user information to form a Information blocks, when the base station divides the user equipment into multiple groups, the base station correspondingly concatenates the processed user information to form multiple information blocks (305); then the base station encodes the concatenated information blocks (306).

Fig. 4 is a device diagram of a user equipment detecting and processing information from an information block containing a plurality of user equipment information in the present invention. As shown in the figure, the user equipment first decodes the received base station signal to obtain an information block containing multiple user equipment information. When the base station divides the user equipment into multiple groups for encoding and sending, the user equipment decodes to obtain multiple The information block of information (400); then the user equipment splits the information block containing a plurality of user equipment information into individual information blocks for specific user equipment (401); then the user equipment processes each information block for specific user equipment respectively (402, 404), check each received information block for a specific user equipment (403, 405) according to its own user equipment ID and other information; finally, the user equipment judges whether the base station has sent information for it (406).

Example

An embodiment of the present invention is described below. In this implementation, it is assumed that the base station calculates a CRC for the control bits other than the user equipment ID of each user equipment, and then performs a masking operation on the user equipment ID and the calculated CRC. Because the present invention does not specify a specific method for generating a specific CRC, the present invention is also applicable to other methods for processing CRC checks.

Fig. 5 is an example of a flow chart for processing control signaling by a base station. First, the base station selects a user equipment that needs scheduling resources, and calculates CRC (501) for the control information of all the user equipment except the user equipment ID; then the base station uses the user equipment ID of the user equipment to calculate the CRC obtained in step (501) Mask operation (503); the base station concatenates the control information except the user equipment ID and the CRC of the user equipment ID mask in the step (502) to this user equipment, and forms the base station to send the control information block ( 503); then the base station needs to judge whether the control information (504) of all user equipments that need to be processed has been respectively processed; if the base station has not processed all user equipments, loop to step (501) and continue to process the next user equipment; if the base station Having processed all user equipments, the base station concatenates the control information blocks calculated for each user equipment to form a control information block (505); next, the base station encodes the concatenated control information blocks (506 ).

Fig. 6 is an example of a flow chart of user equipment receiving downlink control signaling. First, the user equipment receives the signal from the base station, and decodes the resource corresponding to the downlink control channel to obtain a control information block (601) containing control information sent to multiple user equipments; next, the user equipment contains multiple user equipment control information In the control information block of the specific user equipment, calculate the CRC (602) for a control information block sent to the specific user equipment; then the user equipment judges the CRC field after the user equipment ID mask in the received control information block for the specific user equipment, Whether the CRC calculated in the step (602) matches the user equipment ID of oneself (603); if the judgment result of the step (603) is consistent, the user equipment thinks that the downlink control signaling received from the base station is sent to it, and the user equipment thinks that The base station schedules resources for it, and receives data according to the received control signaling (606); if the judgment result of step (603) is inconsistent, the user equipment judges whether it has received the control information containing multiple user equipment control information All of the control information blocks for the specific user equipment in the block have been CRC checked (604); if the user equipment has not detected all the control information blocks, go to step (602) and continue to process the next control for the specific user equipment Information block; if the user equipment has detected all the control information blocks, and the user equipment has not detected the downlink control signaling sent to itself, the user equipment considers that the base station has not transmitted information for it (605). At the next moment of receiving downlink control signaling, the user equipment repeats the above process.

FIG. 9 is a method for the base station to process specific user information when the user equipment ID is equal to the length of the CRC. As shown in the figure, the base station first calculates the CRC (902) for the user information (including or not including the user equipment ID) (901), and then the base station performs a mask operation on the user equipment ID (903) and the calculated CRC. 2 plus operation, that is, XOR operation (904), and finally the base station concatenates the user information except the user equipment ID and the result of the above-mentioned mask operation to form the user's transmission information block (905).

Fig. 10 is a method for the base station to repeatedly process specific user information on the user equipment ID when the length of the user equipment ID is smaller than the length of the CRC. As shown in the figure, on the one hand, the base station calculates the CRC (1002) for the user information (including or not including the user equipment ID) (1001), and on the other hand, the base station repeats the user equipment ID (1003). When the length of the CRC is not the user equipment ID When the length is an integer multiple, some bits of the user equipment ID can be selected to repeat once more (1004), and then the base station performs a mask operation on the repeated user equipment ID and the calculated CRC, which is generally a modulo 2 addition operation, that is, Exclusive OR operation (1005), and finally the base station concatenates the user information except the user equipment ID and the result of the above-mentioned mask operation to form the transmission information block of this user (1006).

Fig. 11 is another method for the base station to process specific user information by encoding and puncturing the user equipment ID when the length of the user equipment ID is smaller than the length of the CRC. As shown in the figure, on the one hand, the base station calculates the CRC (1102) for the user information (including or not including the user equipment ID) (1101), on the other hand, the base station encodes the user equipment ID (1103) (1104), and then punches or Repeat matching to the CRC length (1105), and then the base station performs a masking operation on the processed user equipment ID and the calculated CRC, usually a modulo 2 addition operation, that is, an XOR operation (1106), and finally the base station removes the user equipment ID The user information other than the ID and the result of the above mask operation are concatenated to form the sending information block of this user (1107).

Fig. 7 shows an example of a hardware block diagram of a base station transmitter when the method of the present invention is adopted. As shown in the figure, the base station control unit (700) controls to gather the information of multiple users (701, 702) into one information block (703) after adding verification information, and then the base station performs a The block is channel coded, rate matched and interleaved (704), then modulated (705), added with a cyclic prefix (706), digital/analog converted (707), and finally passed through a radio frequency transmitter (708) and an antenna (709 )emission.

FIG. 8 shows an example of a hardware block diagram of a user equipment receiver when the method of the present invention is adopted. The user equipment receives the signal from the base station through the antenna (800) and the radio frequency receiver (801), undergoes analog/digital conversion (802), removes the cyclic prefix (803), and demodulates (804), and the user equipment decodes the data sent by the base station Interleave, de-rate matching and decoding (805) to obtain an information block containing multiple user equipment information, and finally the user equipment detects whether the base station has sent information for it and performs appropriate processing (806).

Claims (20)

1. A method for a base station to perform CRC check and encoding processing on transmitted information, comprising the steps of: a) The base station processes the CRC check information for the information of each user equipment respectively; b) The base station concatenates the transmitted information blocks processed for each user equipment; c) The base station codes the concatenated information blocks. 2. The method according to claim 1, characterized in that in step a), the CRC calculated by the base station for the specific information of each user equipment can be processed with the specific information to reduce the number of bits of the transmitted information. 3. The method according to claim 2, characterized in that it comprises the steps of: The base station calculates the CRC based on user equipment specific information other than the user equipment ID; Then use the user equipment ID and the calculated CRC as a mask operation; The masked CRC is concatenated with user equipment specific information other than the user equipment ID to form the transmission information block of the user equipment. 4. The method of claim 3, wherein the masking operation is a modulo-2 addition operation. 5. The method according to claim 3, wherein when the length of the user equipment ID is smaller than the length of the CRC, the base station repeats the user equipment ID so that its length is equal to the length of the CRC. 6. The method according to claim 3, wherein when the length of the user equipment ID is smaller than the length of the CRC, the base station codes and punctures the user equipment ID to make its length equal to the length of the CRC. 7. The method according to claim 1, characterized in that in step b), the base station concatenates the transmission information blocks of the user equipment with added CRC information into one information block. 8. The method according to claim 1, wherein in step b), the base station divides the user equipment into multiple groups according to factors such as user equipment channel conditions, so that for each group of user equipment, the base station adds CRC information The information blocks sent by the user equipment are concatenated into one information block. 9. The method according to claim 1, characterized in that in step c), the base station does not add CRC check information to the information block formed by the concatenation. 10. A method for decoding and CRC check processing of transmitted information by a user equipment, comprising the following steps: a) The user equipment receives the signal of the base station, and decodes it on the corresponding resource to obtain an information block containing information sent to multiple user equipments; b) The user equipment sequentially checks each information block for a specific user equipment among the information blocks containing multiple user equipment information, and uses its own user equipment ID to check whether it is sent to itself. 11. The method according to claim 10, characterized in that in step b), the user equipment does not perform an overall CRC check on the information block containing multiple user equipment information. 12. The method according to claim 10, characterized in that in step b), the user equipment determines that the base station has sent information for it, the user equipment thinks that the first information block for the specific user equipment that passes the verification is sent to myself. 13. The method according to claim 10, characterized in that in step b), the method for the user equipment to determine that the base station has sent information for it is that the user equipment checks all information blocks specific to the user equipment before making the determination. 14. The method according to claim 13, wherein if the user equipment uniquely finds that one information block passes the verification, the user equipment considers that the information block is sent to itself. 15. The method according to claim 13, wherein if the user equipment finds that multiple information blocks pass the verification, the user equipment considers that the information sent by the base station is wrong. 16. The method according to claim 13, wherein if the user equipment finds that multiple information blocks pass the verification, the user equipment further analyzes whether the information blocks that have passed the verification are sent to itself according to other conditions. 17. The method according to claim 16, wherein when the information sent by the base station is control signaling, the user equipment checks information such as the format of the transport block and allocated resources in the information block, and when the information is related to its processing capability When it matches, the user equipment considers that the information block is sent to itself. 18. The method according to claim 10, characterized in that in step b), if the user equipment has detected all information blocks directed at a specific user equipment, but does not detect an information block passing the CRC check, the user equipment considers The base station did not send information to it. 19. A base station performs CRC check processing and encoding equipment for transmitted information, including a module for calculating and processing the CRC of user information, used to calculate the CRC of user information, and reduce the number of bits through processing; the cascade module is used The method is to concatenate the user information added with verification information and directly input it to the encoding module. 20. A device for user equipment to decode and process transmitted information, including a segmentation module, used for the user equipment to split the decoded information blocks containing multiple user equipment information into individual pieces for specific user equipment The information block; the verification module is used for the user equipment to verify each received information block for a specific user equipment according to its own user equipment ID and other information; the detection and processing module is used for the user equipment to determine whether the base station sends information and act accordingly.

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