CN102055552B - Method for transmitting control information, method and device for receiving control information - Google Patents

Abstract

The present invention relates to a method for transmitting control information, a method and equipment for receiving control information. The method includes: using different scrambling information to scramble cyclic redundancy check bits of different carriers; cyclic redundancy check bits of different carriers The bits are obtained through cyclic redundancy check of control information of different carriers; the control information and the scrambled cyclic redundancy check bits are sent. The CRC bits of different carriers are scrambled by different scrambling information, so that the scrambling information corresponds to the carrier one by one, and the distinction between different carriers of the same device is realized, so that the UE side can obtain the control information of different carriers of the device through a PDCCH, It realizes the control of multiple downlink or uplink carriers on one downlink carrier PDCCH, maintains backward compatibility to the greatest extent, and does not significantly increase the processing complexity of the UE.

Description

Method for transmitting control information, method and device for receiving control information

technical field

The present invention relates to the technical field of wireless communication, in particular to a method for transmitting control information, a method and equipment for receiving control information. the

Background technique

The long-term evolution (LTE) project of the third generation partnership project (3rd Generation Partnership Project, 3GPP), which is regarded as a "quasi-4G" technology, uses Orthogonal Frequency Division Multiple Access (OFDMA) and multiple input multiple output ( Multiple-Input Multiple-Output, MIMO) as the core, its main performance goals include: in the 20MHz spectrum bandwidth, it can provide a peak rate of 100Mbps downlink and 50Mbps uplink; improve the performance of cell edge users; increase cell capacity; reduce system delay, specifically, The internal one-way transmission delay of the user plane is less than 5ms, the transition time of the control plane from the sleep state to the active state is less than 50ms, and the transition time from the resident state to the active state is less than 100ms; it supports cell coverage with a radius of 100Km; h High-speed mobile users provide access services greater than 100kbps; support paired or unpaired spectrum, and can flexibly configure multiple bandwidths from 1.25MHz to 20MHz. the

At present, the LTE version R8 has been basically completed. In the LTE R8 system, the physical downlink control channel (PDCCH) is used to transmit downlink control information (Downlink Control Information, DCI). There are multiple formats of DCI, and each format corresponds to sending different control information. The control information transmitted by the DCI includes: uplink and downlink data scheduling information, uplink power control commands, paging indication messages, and the like. In the LTE system, the PDCCH implicitly indicates which user equipment (UE) a control message belongs to. The specific transmission process is shown in Figure 1, including:

Step 10, the UE performs initial access, and during the establishment of the RRC connection, the eNB will assign a unique cell radio network temporary identifier (Cell Radio Network Temporary Identifier, C-RNTI) under this cell to the UE. the

Step 11. If it is desired to send a control message to a certain UE, the eNB performs cyclic redundancy check (CRC) calculation on the payload (payload) of the PDCCH DCI to obtain CRC bits (bit). the

Step 12, scrambling the calculated CRC bits with the C-RNTI of the UE. the

Step 13, the scrambled CRC bits are sent together with the payload. the

Step 14: After receiving the PDCCH DCI, the UE performs blind solution, and performs CRC check calculation on the DCI payload to obtain CRC bits. the

Step 15, the UE uses its own C-RNTI to descramble the received scrambled CRC bits. the

Step 16. The UE compares the calculated CRC bits with the descrambled CRC bits. If they are the same, it means that the control message is for the UE; otherwise, it means that it does not belong to the UE, and the UE will ignore the control message. the

It is the advanced version of LTE (LTE Advance, LTE-A) that officially brings LTE into 4G. The overall technical design of LTE-A far exceeds the minimum requirements of 4G technology. The minimum requirement of LTE-A proposed by GPP is: the downlink peak rate is 1Gbps, the uplink peak rate is 500Mbps, and the uplink and downlink peak spectrum utilization rate reaches 15Mbps/Hz and 30Mbps/Hz respectively. These parameters are already far higher than the minimum technical requirements of the ITU, and have obvious advantages. the

In order to support larger system bandwidth and achieve higher capacity and spectral efficiency, LTE-A introduces an important feature of carrier aggregation (CA). From the terminal point of view, those LTE-A terminals whose receiving bandwidth is greater than 20M can receive transmissions of multiple carriers at the same time, which increases the transmission rate of a single user. From the perspective of the base station on the system side, a base station can allocate the most suitable time-frequency resources to users on multiple carriers at the same time according to the capabilities, service requirements and channel conditions of each user, which improves the capacity and spectrum efficiency of the entire system. From the perspective of operators, carrier aggregation technology provides an effective method to utilize scattered spectrum resources. It can utilize spectrum resources that are far apart or exceed the maximum bandwidth (20MHz) supported by the LTE (R8) system, so that operators do not have to Purchasing new spectrum can provide users with greater bandwidth and transmission rate. the

According to the relationship between the number of uplink and downlink carriers, carrier aggregation can be divided into symmetric carrier aggregation and asymmetric carrier aggregation. Symmetrical carrier aggregation means that the number of uplink and downlink carriers is the same, as shown in Figure 2, three uplink (UL) and downlink (DL) aggregated carriers (CCC) correspond one-to-one. Asymmetric carrier aggregation means that the number of uplink and downlink carriers is different, as shown in Figure 3A and Figure 3B. In FIG. 3A, there are more downlink carriers than uplink carriers, and in FIG. 3B, there are more uplink carriers than downlink carriers.

After carrier aggregation is introduced, a UE may have multiple uplink or downlink carriers. If the PDCCH of one downlink carrier is used to control resources on multiple downlink or multiple uplink carriers, such as the scenario of asymmetric carrier aggregation, the scenario where one downlink carrier corresponds to multiple uplink carriers; or, use a specific downlink The PDCCH of a carrier controls resources on other uplink or downlink carriers, so it is necessary to allocate different PDCCHs to UEs for different carriers. the

In the process of realizing the present invention, the inventor found that the existing technology has at least the following defects: a C-RNTI scrambling method is used in the LTETER8 system to indicate which UE a certain PDCCH is sent to, and the receiving end UE cannot distinguish the received The PDCCH is a control message for which carrier, so the control of multiple downlink or uplink carriers on the PDCCH of one downlink carrier cannot be realized. the

Contents of the invention

Embodiments of the present invention provide a method for transmitting control information, and a method and device for receiving control information. the

An embodiment of the present invention provides a method for transmitting control information, including:

Using different scrambling information to scramble the cyclic redundancy check bits of different carriers of the same user equipment; the cyclic redundancy check bits of the different carriers are checked through the cyclic redundancy check of the control information of different carriers of the same user equipment verified;

The control information and the scrambled cyclic redundancy check bits are sent on a physical downlink control channel. the

The embodiment of the present invention also provides a method for receiving control information, including:

The user equipment receives control information of different carriers and scrambled cyclic redundancy check bits on a physical downlink control channel;

The user equipment performs a cyclic redundancy check on the control information of the different carriers to obtain first cyclic redundancy check bits of the different carriers, and uses different scrambling information to descramble the scrambled cycles of the different carriers Redundancy check bits, obtaining the second cyclic redundancy check bits of the different carriers;

The user equipment obtains the control information of each carrier of the user equipment when the first cyclic redundancy check bit is the same as the second cyclic redundancy check bit. the

The embodiment of the present invention also provides a base station, including:

A scrambling module, configured to use different scrambling information to scramble the cyclic redundancy check bits of different carriers of the same user equipment; The control information cyclic redundancy check is obtained;

A sending module, configured to send the control information and the scrambled cyclic redundancy check bits on a physical downlink control channel. the

The embodiment of the present invention also provides a user equipment, including:

The control information receiving module is used to receive control information of different carriers and scrambled cyclic redundancy check bits on a physical downlink control channel;

A descrambling module, configured to perform a cyclic redundancy check on the control information of the different carriers to obtain the first cyclic redundancy check bits of the different carriers, and use different scrambling information to descramble the scrambled information of the different carriers The cyclic redundancy check bits of the different carriers are obtained to obtain the second cyclic redundancy check bits of the different carriers;

A control information obtaining module, configured to obtain control information of each carrier of the user equipment when the first cyclic redundancy check bit is the same as the second cyclic redundancy check bit. the

The above embodiment scrambles the CRC bits of different carriers with different scrambling information, so that the scrambling information corresponds to the carrier one by one, and realizes the distinction between different carriers of the same device, so that the UE side can obtain the information of different carriers of the device through one PDCCH. The control information realizes the control of multiple downlink or uplink carriers on one downlink carrier PDCCH, maintains backward compatibility to the greatest extent, and does not significantly increase the processing complexity of the UE. the

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. the

Description of drawings

Fig. 1 is a schematic diagram of the control information transmission process in the prior art;

FIG. 2 is a schematic diagram of symmetrical carrier aggregation in the prior art;

3A and 3B are schematic diagrams of asymmetric carrier aggregation in the prior art;

Fig. 4 is a flowchart of a method for transmitting control information provided by an embodiment of the present invention;

5 is a schematic diagram of another method for transmitting control information provided by an embodiment of the present invention;

Fig. 6 is a flowchart of a method for receiving control information provided by an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a base station provided by an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a user equipment provided by an embodiment of the present invention. the

Detailed ways

Fig. 4 is a flowchart of a method for transmitting control information provided by an embodiment of the present invention. The method includes:

Step 41, using different scrambling information to scramble the CRC bits of different carriers; the CRC bits of different carriers are obtained by CRC the control information of different carriers;

Step 42. Send the control information and the scrambled CRC bits. the

This embodiment uses different scrambling information to scramble the CRC bits of different carriers, so that the scrambling information corresponds to the carrier one by one, and realizes the distinction between different carriers of the same device, so that the UE side can obtain the information of different carriers of the device through one PDCCH. The control information realizes the control of multiple downlink or uplink carriers on one downlink carrier PDCCH, maintains backward compatibility to the greatest extent, and does not significantly increase the processing complexity of the UE. the

The above step 41 and step 42 may be performed by a base station such as an eNB. the

In the above step 41, the base station can allocate a C-RNTI for each available carrier of the UE, and use the C-RNTI allocated for the carrier to scramble the control information of each carrier. In this way, the scrambling method of the existing LTE PDCCH can be used. Distinguishing control messages of different carriers; or on the basis of existing C-RNTI allocation for UEs, at the same time use carrier identifiers such as carrier labels to scramble the control information of corresponding carriers. That is, the UE-based C-RNTI allocation method in the LTE system is maintained, but the CRNTI and the carrier identifier are jointly scrambled when the PDCC HDCI load is scrambled, so as to distinguish multiple carriers. the

When the base station allocates different C-RNTIs corresponding to different carriers to a UE, it can display the C-RNTI to the terminal through a message, or indicate the C-RNTI to the terminal implicitly, that is, there is no need for the base station to send the C-RNTI to the terminal. UE, the UE side calculates and obtains the C-RNTI of each carrier in the same manner as the base station side. the

There are two methods of semi-static configuration and dynamic configuration when displaying instructions through messages. the

In the semi-static configuration mode, the base station allocates a C-RNTI to each available carrier of the UE according to information such as UE capabilities before the UE establishes a service. This configuration is valid as long as the UE is in the connected state of the base station, until there is a new configuration message or the UE is handed over to another base station or the UE enters the idle (Idle) state, and the C-RNTI is released. the

In the dynamic configuration mode, the base station sends the C-RNTI to the UE through a carrier management message. When a carrier is added/deleted/switched, the base station dynamically configures the C-RNTI used by the carrier and sends it to the UE through a carrier management message. the

When implicitly indicated, the base station allocates a temporary C-RNTI (T-C-RNTI) when the UE randomly accesses, and the UE that has successfully accessed will convert the T-C-RNTI to the initial C-RNTI after entering the connected state. In the carrier aggregation scenario, both the base station and the successfully accessed UE can generate C-RNTI on other carriers from the initial C-RNTI. the

For example: the base station and the successfully accessed UE calculate the C-RNTI used by each carrier according to the number of carriers available to the UE, the initial C-RNTI, and the label interval parameter m of each carrier. It is assumed that the number of carriers available to the UE that has successfully accessed is 5, the initial C-RNTI is 101, and m is equal to 2. If both the base station and the UE allocate C-RNTI to each carrier in the ascending order of the available carrier numbers, the C-RNTI of the carrier with the smallest number is the initial C-RNTI, which is 101, and the C-RNTI of other carriers is based on the formula C-RNTI _k = C-RNTI _int + m × CarrierIndex _k is calculated. Where C-RNTI _int is the initial C-RNTI allocated by the UE after random access, CarrierIndex _k is the carrier label, C-RNTI _k is the C-RNTI of the carrier with label k, and m is the label interval parameter of each carrier. The C-RNTIs of other carriers are 103, 105, 107, and 109 in ascending order of carrier numbers. Thus, both the base station and the UE obtain the C-RNTI of each carrier as 101, 103, 105, 107, and 109, respectively. The base station and the UE may also allocate C-RNTIs to each carrier in descending order of carrier numbers. For example, the C-RNTI of each carrier: 93, 95, 97, 99, and 101 can be obtained sequentially through the formula C-RNTI _k = C-RNTI _int - m × CarrierIndex _k . The carrier numbers are synchronized on the base station side and the UE side, or the base station notifies the UE through broadcasting, etc., or the two sides default to label the carriers in ascending (decreasing) order of carrier frequencies.

Implicit instructions can also include semi-static configuration and dynamic configuration. the

In the semi-static configuration mode, as long as the UE is connected to the base station, the C-RNTI will remain valid until the available carrier changes or the UE is handed over to another base station or the UE enters an idle state, and both the base station and the UE release the C-RNTI. the

In the dynamic configuration mode, the base station and the UE dynamically calculate the C-RNTI of each carrier according to the carrier configured by the UE, such as through the above formula C-RNTI _k = C-RNTI _int + m×CarrierIndex _k or C-RNTI _k = C-RNTI _Int -m×CarrierIndex _k is calculated.

When the C-RNTI needs to be re-paired when there is a carrier deletion or addition or switching, after the carrier is dynamically configured, the base station and the UE calculate and obtain the C-RNTI of each carrier according to the carrier label. the

In the above step 41, when the base station scrambles the control information with the C-RNTI and the carrier label, the transmission process is shown in FIG. 5, including steps 50-56. Wherein, step 50, step 51, step 53, step 54, and step 56 can be the same as above-mentioned step 10, step 11, step 13, step 14, and step 16. In step 52, the eNB uses the C-RNTI and the carrier label to jointly scramble the CRC bits. Correspondingly, in step 55, the UE uses the C-RNTI and the carrier label to descramble together to obtain CRC bits. Since the carrier number is 10, the scrambling sequence is 16-bit binary, and 16 means the 16th bit is the lowest bit, and 1 means the first bit is the highest bit, then the binary sequence of the carrier number is 0000000000001010. The antenna of the uplink UE selects the 16th bit of the carrier number for scrambling, the base station selects the 12th-15th bit of the carrier number, namely 0101, to scramble the CRC bits of the corresponding carrier, and the UE side selects the 12th-15th bit of the carrier number, namely 0101 The scrambled CRC bits for the corresponding carrier are descrambled. the

FIG. 6 is a flowchart of a method for receiving control information provided by an embodiment of the present invention. This embodiment corresponds to the above-mentioned method embodiment, and the method includes:

Step 61, receiving control information of different carriers and scrambled CRC bits;

Step 62. Perform CRC on the control information of the different carriers to obtain the first CRC bits of the different carriers, and use different scrambling information to descramble the scrambled CRC bits of the different carriers to obtain the first CRC bits of the different carriers Two CRC bits;

Step 63: Obtain the control information of each carrier when the first CRC bits are the same as the second CRC bits. the

The above step 61, step 62 and step 63 may be performed by the UE. the

For the scrambled CRC bits received by the UE in the above step 61, refer to the description of the above step 41 for details. the

In the above step 62, the UE uses different scrambling information to descramble the scrambled CRC bits of the different carriers may include using the C-RNTI of different carriers to descramble the scrambled CRC bits of the different carriers; or may It includes: jointly descrambling the scrambled CRC bits of each carrier by using the C-RNTI of the device and the carrier identifier of each carrier of the device. The C-RNTI of different carriers can be calculated and obtained by the UE, that is, using the C-RNTI of different carriers to descramble the scrambled CRC bits of the different carriers may include: using the initial C-RNTI allocated by the base station, and according to the initial C-RNTI - The C-RNTI of each carrier obtained through RNTI calculation corresponds to the scrambled CRC bits of each carrier descrambled. The C-RNTI of different carriers can also be obtained by sending by the base station, that is, the UE receives the different scrambling information sent by the base station to the user equipment before establishing a service; or, the UE receives the different scrambling information sent by the base station through a carrier management message information. For details, refer to the description of the above-mentioned explicit indication and implicit indication. the

In this embodiment, the UE side corresponds to the above transmission method embodiment, obtains CRC bits of different carriers by descrambling different scrambling information, thereby obtains control information of different carriers of the device through a PDCCH, and implements a downlink carrier The control of multiple downlink or uplink carriers on the PDCCH maintains backward compatibility to the greatest extent, and does not significantly increase the processing complexity of the UE. the

FIG. 7 is a schematic structural diagram of a base station provided by an embodiment of the present invention. The base station may be an eNB, and includes: a scrambling module 71 and a sending module 72 . The scrambling module 71 is used to scramble the CRC bits of different carriers using different scrambling information; for example, the scrambling module 71 can be specifically used to scramble the CRC bits of different carriers using C-RNTI of different carriers; or can Specifically, it is used to jointly scramble the CRC bits of each carrier by using the C-RNTI of the same user equipment and the carrier identifier of each carrier of the user equipment. The CRC bits of the different carriers are obtained through CRC of the control information of the different carriers. The sending module 72 is used for sending the control information and the scrambled CRC bits. the

In the display indication mode, the base station provided by the embodiment of the present invention may further include: a scrambling information sending module. The scrambling information sending module is used for sending the different scrambling information to the user equipment before establishing a service; or for sending the different scrambling information through a carrier management message. For details, see the description of the above display instructions. the

In this embodiment, the base station scrambles the CRC bits of different carriers through different scrambling information, so that the scrambling information corresponds to the carrier one by one, and realizes the distinction between different carriers of the same device, so that the UE can obtain the CRC bits of the device through a PDCCH. The control information of different carriers realizes the control of multiple downlink or uplink carriers on one downlink carrier PDCCH, maintains backward compatibility to the greatest extent, and does not significantly increase the processing complexity of the UE. the

Fig. 8 is a schematic structural diagram of a user equipment provided by an embodiment of the present invention. The UE includes: a control information receiving module 81 , a descrambling module 82 and a control information obtaining module 83 . The control information receiving module 81 is used for receiving control information of different carriers and scrambled CRC bits. The descrambling module 82 is configured to perform CRC on the control information of the different carriers to obtain the first CRC bits of the different carriers, and use different scrambling information to descramble the scrambled CRC bits of the different carriers to obtain the first CRC bits of the different carriers. The second CRC bit of the carrier. The descrambling module 82 can be specifically used to descramble the scrambled CRC bits of the different carriers by using the C-RNTI of different carriers; or it can be specifically used to use the C-RNTI of the device and the carriers of the carriers of the device Identifying the scrambled CRC bits that are commonly descrambled for the respective carriers. The control information obtaining module 83 is configured to obtain the control information of each carrier when the first CRC bits are the same as the second CRC bits. the

In the display indication mode, the user equipment provided by the embodiment of the present invention may further include: a scrambling information receiving module. The scrambling information receiving module is used for receiving the different scrambling information sent by the base station to the user equipment before establishing a service; or for receiving the different scrambling information sent by the base station through a carrier management message. For details, see the description of the above display instructions. the

In this embodiment, the UE side corresponds to the above-mentioned base station embodiment, and obtains the CRC bits of different carriers by descrambling different scrambling information, thereby obtaining the control information of different carriers of the device through a PDCCH, and realizing a downlink carrier PDCCH Uplink control of multiple downlink or uplink carriers maintains backward compatibility to the greatest extent, and its processing complexity will not increase significantly. the

The technical solutions provided by the above embodiments enable the multi-carrier system to assign multiple downlink or uplink carrier resources on one PDCCH, distinguish different downlink or uplink carriers, maintain backward compatibility to the greatest extent, and do not significantly increase UE processing complexity. the

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes. the

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention. the

Claims (16)

1. A method for transmitting control information, comprising: Using different scrambling information to scramble the cyclic redundancy check bits of different carriers of the same user equipment; the cyclic redundancy check bits of the different carriers are checked through the cyclic redundancy check of the control information of different carriers of the same user equipment verified; The control information and the scrambled cyclic redundancy check bits are sent on a physical downlink control channel. 2. The method for transmitting control information according to claim 1, wherein the cyclic redundancy check bits of different carriers of the same user equipment are scrambled using different scrambling information, comprising: The cyclic redundancy check bits of different carriers of the same user equipment are scrambled by using cell radio network temporary identifiers of different carriers. 3. The method for transmitting control information according to claim 2, wherein the cyclic redundancy check bits of different carriers of the same user equipment are scrambled using cell wireless network temporary identifiers of different carriers, comprising: Using the initial cell wireless network temporary identifier assigned to the same user equipment, and the cell wireless network temporary identifiers of the carriers of the same user equipment calculated and obtained according to the initial cell wireless network temporary identifier to correspond to the scrambled The cyclic redundancy check bits of each carrier are described. 4. The method for transmitting control information according to any one of claims 1-3, further comprising: sending said different scrambling information to said same user equipment before establishing a service; Alternatively, the method further includes: sending the different scrambling information through a carrier management message. 5. The method for transmitting control information according to claim 1, wherein the cyclic redundancy check bits of different carriers of the same user equipment are scrambled using different scrambling information, comprising: Using the cell radio network temporary identifier of the same user equipment and the carrier identifiers of the carriers of the same user equipment to jointly scramble the cyclic redundancy check bits of the carriers of the same user equipment. 6. A method for receiving control information, comprising: The user equipment receives control information of different carriers and scrambled cyclic redundancy check bits on a physical downlink control channel; The user equipment performs a cyclic redundancy check on the control information of the different carriers to obtain first cyclic redundancy check bits of the different carriers, and uses different scrambling information to descramble the scrambled cycles of the different carriers Redundancy check bits, obtaining second cyclic redundancy check bits of the different carriers; The user equipment obtains the control information of each carrier of the user equipment when the first cyclic redundancy check bit is the same as the second cyclic redundancy check bit. 7. The method for receiving control information according to claim 6, characterized in that, using different scrambling information to descramble the scrambled cyclic redundancy check bits of the different carriers comprises: The scrambled cyclic redundancy check bits of the different carriers are descrambled using the cell radio network temporary identifiers of the different carriers. 8. The method for receiving control information according to claim 7, characterized in that, descrambling the scrambled cyclic redundancy check bits of the different carriers using cell wireless network temporary identifiers of different carriers, comprising: Using the initial cell wireless network temporary identifier assigned by the base station, and the cell wireless network temporary identifier of each carrier calculated and obtained according to the initial cell wireless network temporary identifier correspond to descrambling the scrambled cycle of each carrier Redundancy check bits. 9. The method for receiving control information according to claim 6 or 7, further comprising: receiving the different scrambling information sent by the base station to the user equipment before establishing the service; Or, also include: The different scrambling information sent by the base station through a carrier management message is received. 10. The method for receiving control information according to claim 6, wherein using different scrambling information to descramble the scrambled cyclic redundancy check bits of the different carriers comprises: Descrambling the scrambled cyclic redundancy check bits of each carrier by using the cell wireless network temporary identifier of the device and the carrier identifier of each carrier of the device. 11. A base station, characterized in that it comprises: A scrambling module, configured to use different scrambling information to scramble the cyclic redundancy check bits of different carriers of the same user equipment; The control information cyclic redundancy check is obtained; A sending module, configured to send the control information and the scrambled cyclic redundancy check bits on a physical downlink control channel. 12. The base station according to claim 11, wherein the scrambling module is specifically configured to scramble the cyclic redundancy check bits of different carriers of the same user equipment by using temporary cell wireless network identifiers of different carriers ; or it is specifically used to jointly scramble the cyclic redundancy check bits of each carrier of the same user equipment by using the cell wireless network temporary identifier of the same user equipment and the carrier identifier of each carrier of the same user equipment. 13. The base station according to claim 11 or 12, further comprising: A scrambling information sending module, configured to send the different scrambling information to the same user equipment before establishing a service; or send the different scrambling information through a carrier management message. 14. A user equipment, characterized in that it comprises: The control information receiving module is used to receive control information of different carriers and scrambled cyclic redundancy check bits on a physical downlink control channel; A descrambling module, configured to perform a cyclic redundancy check on the control information of the different carriers to obtain the first cyclic redundancy check bits of the different carriers, and use different scrambling information to descramble the scrambled information of the different carriers The cyclic redundancy check bits of the different carriers are obtained to obtain the second cyclic redundancy check bits of the different carriers; A control information obtaining module, configured to obtain control information of each carrier of the user equipment when the first cyclic redundancy check bit is the same as the second cyclic redundancy check bit. 15. The user equipment according to claim 14, wherein the descrambling module is specifically configured to descramble the scrambled cyclic redundancy checks of the different carriers by using the cell wireless network temporary identifiers of the different carriers bits; or the scrambled cyclic redundancy check bits specifically used to jointly descramble the carriers by using the cell wireless network temporary identifier of the device and the carrier identifiers of the carriers of the device. 16. The user equipment according to claim 14 or 15, further comprising: The scrambling information receiving module is configured to receive the different scrambling information sent by the base station to the user equipment before establishing a service; or to receive the different scrambling information sent by the base station through a carrier management message.