WO2011079469A1 - Method and device for updating system information - Google Patents

Abstract

A method and device for updating system information relate to the field of communications technology. The method can include: monitoring the Common Search Space (CSS) of a primary component carrier; when scheduling information of a system information updating broadcast message is detected, acquiring the system information updating broadcast message according to the indication of the scheduling information, or when scheduling information of a paging message is detected, acquiring the paging message according to the indication of the scheduling information; and from the system information updating broadcast message or the paging message, acquiring the system information updating value of one or more component carriers whose system information has changed. By adopting the method, it is not necessary to monitor the CSS of the all corresponding component carriers when a User Equipment (UE) acquires the updated system information of the component carriers.

Description

 System information updating method and device

 The present invention relates to the field of communications technologies, and in particular, to a system information updating method and device. Background technique

 In order to meet the requirements of IMT-Advanced (Advanced International Mobile Telecommunications) and support peak data rates up to lGbits/s, 3GPP LTE-ADVANCED (LTE-A, LTE Continued Evolution) systems have now agreed to carrier aggregation (CA, Carrier Aggregation). , also known as carrier aggregation) technology as a way to extend system bandwidth. Carrier aggregation technology aggregates multiple component carriers (CCs) into a carrier with a large bandwidth (for example, higher than 20MHz) to support high-speed data rates. For example, five 20MHz component carriers can be aggregated together into a downlink transmission bandwidth of 100MHz. In order to reduce the blind detection complexity of the UE (User Equipment), it is generally desirable for the UE to only listen to one CC, or only the CSS (Common Search Space) of some CCs in multiple CCs. The UE can obtain the scheduling information of the system to send the public information by searching the CSS space, so as to correctly receive the public information of the system, and the public information may include a paging message, a system information, and the like.

 A method for updating a single carrier system information provided by the prior art includes: in an idle (Idle) mode, the UE listens to a paging message, and learns whether the system information is about to change through a paging message. If the system information changes, the UE is in the system. The system information is updated during the information change period. In Active mode, the UE has two ways to update the system information, namely the paging mechanism and the System Information Block 1 (SIB1) value tag mechanism. The paging mode of the active mode is similar to the update process of the Idle mode. Under the SIB1 mechanism, the UE receives the SIB1 message and checks whether the value of the value tag field changes. If it changes, the system information changes, and the UE changes the system information. Update system information during the cycle.

The inventors have found that the prior art has at least the following drawbacks: the prior art system information update method is directed to the case of a single carrier, and for a multi-carrier system, how does the UE update the system information of its CC? Become a problem.

Summary of the invention

 Embodiments of the present invention provide a system information update method and device to implement update of component carrier system information.

 The embodiment of the invention provides a method for updating system information, including:

 Listening to the common search space of the main component carrier;

 When the system information is updated to update the scheduling information of the broadcast message, the system information update broadcast message is obtained according to the indication of the scheduling information, or

 When the scheduling information of the paging message is detected, the paging cancellation is obtained according to the indication of the scheduling information.

A system information update value of one or more component carriers in which a change in system information occurs is obtained from the system information update broadcast message or the paging message.

 The embodiment of the invention further provides a method for updating system information, including:

 Embedding one or more system information update values of component carriers into a system information update broadcast message or a paging message;

 Sending the system information to update a broadcast message or a paging message.

 The embodiment of the invention further provides a method for updating system information, including:

 Knowing that the system information of one or more other component carriers is changed, the one or more other component carriers are component carriers other than the primary component carrier;

 Monitoring a common search space of the one or more other component carriers to acquire scheduling information of system information of the one or more other component carriers and updated system information;

 After obtaining system information of one or more other component carriers, the common search space of the primary component carrier or the new primary component carrier is monitored.

 The embodiment of the invention further provides a method for updating system information, including:

Knowing that system information of one or more other component carriers has changed, the one or more other The component carrier is a component carrier other than the main component carrier;

 Searching, by means of time division multiplexing, a common search space of the one or more other component carriers and at least one primary component carrier to obtain scheduling information of the system information of the one or more other component carriers and updated system information. .

 The embodiment of the invention further provides a method for updating system information, including:

 Obtaining that the system information of the plurality of other component carriers is changed, and the plurality of other component carriers are component carriers other than the main component carrier;

 While maintaining the common search space of the main component carrier, the common search space of the plurality of other component carriers is alternately searched in a time division multiplexing manner to acquire scheduling information and update information of the system information of the plurality of other component carriers. System information.

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

 a fourth monitoring unit, configured to monitor a common search space of the primary component carrier;

 a scheduling information acquiring unit, configured to: when the system information is updated to update the scheduling information of the broadcast message, acquire the system information update broadcast message according to the indication of the scheduling information, or

 When the scheduling information of the paging message is detected, the paging message is obtained according to the indication of the scheduling information;

 And a system information acquiring unit, configured to acquire, from the system information update broadcast message or the paging message, a system information update value of one or more component carriers in which the system information change occurs.

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

 a message generating unit, configured to embed one or more system information update values of the component carrier into a system information update broadcast message or a paging message of the primary component carrier;

 a message sending unit, configured to send the system information to update a broadcast message or a paging message.

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

a third acquiring unit, configured to learn, that the system information of one or more other component carriers is changed, where the one or more other component carriers are component carriers other than the primary component carrier; a third monitoring unit, configured to monitor a common search space of the one or more other component carriers, to obtain scheduling information of the system information of the one or more other component carriers, and updated system information, where one or more After the other system information composing the carrier, the common search space of the primary component carrier or the updated primary component carrier is monitored.

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

 a first acquiring unit, configured to learn, that the system information of one or more other component carriers is changed, where the one or more other component carriers are component carriers other than the primary component carrier;

 a first monitoring unit, configured to alternately search a common search space of the one or more other component carriers and at least one primary component carrier by using time division multiplexing to obtain system information of the one or more other component carriers Scheduling information and updated system information.

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

 a second acquiring unit, configured to learn, that the system information of the plurality of other component carriers is changed, where the plurality of other component carriers are component carriers other than the main component carrier;

 a second monitoring unit, configured to alternately search a common search space of the plurality of other component carriers by using a time division multiplexing manner while acquiring a common search space of the primary component carrier to acquire the plurality of other component carriers Transfer information of system information and updated system information.

 According to the foregoing solution, the embodiment of the present invention enables the UE to perform system information update on other CCs except the primary CC, and reduces the complexity of the blind detection of the UE while satisfying the system information update, thereby saving the UE's work. Consumption.

DRAWINGS

 FIG. 1 is a schematic diagram of a method for updating system information according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of another method for updating system information according to an embodiment of the present invention; FIG. 2 is a schematic diagram of another method for updating system information according to an embodiment of the present invention; FIG. Schematic diagram of a method for updating system information; FIG. 4 is a schematic diagram of still another method for updating system information according to an embodiment of the present invention; FIG. 5 is a schematic diagram of still another method for updating system information according to an embodiment of the present invention; FIG. 6 is a schematic diagram of another method for updating system information according to an embodiment of the present invention; FIG. FIG. 7 is a schematic diagram of a user equipment according to an embodiment of the present invention;

 FIG. 7b is a schematic diagram of a user equipment according to an embodiment of the present invention;

 FIG. 8 is a schematic diagram of a user equipment according to an embodiment of the present disclosure;

 FIG. 9 is a schematic diagram of a user equipment according to an embodiment of the present disclosure;

 FIG. 10 is a schematic diagram of a base station according to an embodiment of the present invention.

detailed description

 Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the following embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

 FIG. 1 is a schematic diagram of a method for updating system information according to an embodiment of the present invention, where the method includes:

 Slla: the system information of one or more other component carriers is changed, and the one or more other component carriers are component carriers other than the main component carrier;

 S12a: alternately searching for a common search space of the one or more other component carriers and at least one primary component carrier in a time division multiplexing manner to acquire scheduling information of system information of the one or more other component carriers and updated system message.

In this embodiment, when the system information of one or more other component carriers is changed, it is not necessary to simultaneously monitor the main component carriers and other component carriers whose system information is changed, and the system information is alternately searched by means of time division multiplexing. The common search space of the other component carriers and the main component carrier that are changed can reduce the complexity of the blind detection of the system while updating the information of the component carrier system, thereby saving the power consumption of the user equipment. For example, when the current main component carrier of the system is 2, use A and B respectively. It is indicated that if the system information of the other two component carriers C and D is changed, the common search space of the four component carriers A, B, C and D can be alternately searched by means of time division multiplexing. Further, while alternately searching for a common search space of one or more other component carriers and at least one primary component carrier whose system information changes are changed in a time division multiplexing manner, the method may further include: maintaining the remaining main component carrier a common search space, the remaining primary component carriers being other primary component carriers than the at least one primary component carrier.

 If the current main component carrier of the system is large, the common search space of the main component carrier of the listening part can be maintained, and the time-division multiplexing mode is alternately searched for another part of the main component carrier and the component carrier whose system information is changed, due to the introduction of the time division multiplexing mode. It can still reduce the complexity of blind detection of the system. For example, the current main component carrier of the system is three, namely, B and E, and the common search space of the main component carriers C, D and the other component carriers C and D whose system information changes may be alternately searched by means of time division multiplexing. The other main component carrier E can maintain its listening state at all times, which is not limited in this embodiment.

 It should be noted that the system information of any one or more primary component carriers may also be changed, that is, the above-mentioned time division multiplexing mode is used to monitor, in addition to the one or more other component carrier system information changes. The system information of the at least one primary component carrier or other primary component carrier that is still being monitored may also be changed. At this time, the user equipment may also obtain the system information of the primary component carrier through the monitoring process.

 The foregoing embodiment may be modified in some ways, and FIG. 1b is a schematic diagram of another method for updating system information according to an embodiment of the present invention, where the method includes:

 Sllb: knowing that system information of a plurality of other component carriers is changed, and the plurality of other component carriers are component carriers other than the main component carrier;

 S12b: while maintaining the common search space of the primary component carrier, alternately searching for a common search space of the plurality of other component carriers in a time division multiplexing manner to acquire scheduling information of system information of the plurality of other component carriers. And updated system information.

The embodiment corresponding to FIG. 1b is different from the corresponding embodiment of FIG. 1a in that: the current main group of the system The carrier is kept in the listening state, and the plurality of other component carriers that change the system information are alternately monitored by the time division multiplexing mode, and the multiple component carriers whose system information changes are not simultaneously monitored at the same time, and the carrier system information is updated. At the same time reduce the complexity of blind detection of the system. In addition to the change of the information of the plurality of component carrier systems, part or all of the main component carriers of the main component carrier that are monitored may also change system information, and the system information corresponding to the main component carrier may also be obtained by maintaining the monitoring process. .

 In addition to listening to the main CC, the UE can monitor the CSS space of other CCs when the system information of other CCs changes, but this may improve the complexity of UE blind detection. The embodiment of the invention can prevent the UE from constantly listening to the CSS of other CCs other than the primary CC, and can reduce the complexity of the blind detection by the UE. FIG. 2 is a schematic diagram of still another method for updating system information according to an embodiment of the present invention. The method includes: S21: learning that system information of one or more other component carriers is changed, and the one or more other component carriers are a component carrier other than the main component carrier;

 S22: Listen to a common search space of the one or more other component carriers to obtain scheduling information of system information of the one or more other component carriers and updated system information.

 S23: After obtaining system information of one or more other component carriers, the common search space of the primary component carrier or the updated primary component carrier is monitored.

In this embodiment, when one or more component carriers whose system information changes are different from the main component carrier, these component carriers different from the main component carrier may be referred to as other component carriers, and other components in which system information changes. The common search space of the carrier is monitored to obtain system information of one or more other component carriers whose system information has changed. After updating the system information, the original primary component carrier can continue to be monitored, and the one or more other component carriers are no longer monitored; if the primary component carrier is updated, the updated primary component carrier can also be monitored. The method can be used to enable the UE to obtain updated system information of other component carriers, and the UE does not have to listen to the other component carriers as always after listening to the main component carrier, and after updating the system information, return to the main component carrier for monitoring, saving The subsequent blind detection process for other component carriers ensures normal operation of the subsequent monitoring process. Listening to the common search space of the one or more other component carriers may include replacing one or more primary component carriers with the one or more other component carriers to listen for a common search of the one or more other component carriers space. That is, the UE originally listens to the main component carrier A, and when it learns that another carrier B system information changes, it can listen to the common search space of another carrier B, suspend the monitoring of the main component carrier A, and can acquire the carrier B. After the system information, return to the main component carrier A for monitoring.

 In a specific application, the monitoring a common search space of the one or more other component carriers includes adding the one or more other component carriers to a primary component carrier set to listen to the one or more other components. The common search space for the carrier. The other component carriers that are to be monitored are added to the primary component carrier set, and the other component carriers are monitored as the primary component carrier to obtain system information of other component carriers. The adding one or more other component carriers to the primary component carrier set can include replacing one or more primary component carriers in the primary component carrier set with the one or more other component carriers. That is to say, one or more component carriers in the main component carrier set can be stopped and the one or more other component carriers are monitored.

 The following example is explained. In a specific implementation, if the original primary component carrier is eight, B, and

C, they can be regarded as a set. When the system information of another component carrier D changes, the UE can start to listen to the component carrier D while listening to the main component carriers A, B, and C, and can obtain the component carrier D. Stop listening to D after the system information. Specifically, the UE may monitor the carrier D as the primary carrier for monitoring, that is, add the carrier D to the primary component carrier set, where the new primary component carrier set includes eight, B, C, and D. However, the carrier D does not really become the primary component carrier, and it can only become the primary component carrier temporarily. After the system information of the carrier D is obtained by monitoring, the UE can continue to monitor the original primary carrier carrier, B and C, and stop. Listening to the component carrier D. In another specific implementation, the UE may also replace the original primary carrier C with the carrier D, that is, start listening to A, B, and D; or the UE may replace all the original primary carriers A, B, and C with the carrier D, and only listen to the carrier D. . After obtaining the system information of the carrier D, the UE may re-monitor the original primary component carrier, or the UE may also modify the original primary component carrier, so that after acquiring the system information of the carrier D, the UE monitors the primary component carrier and the original eight. The B and C are different, that is, the main component carrier that monitors the update, and the updated main component carrier may be partially or completely different from the original main component carriers A, B, and C. For example, the updated main component carrier may be A, B and E can also be E, F and G. The UE may also use the component carrier D as an updated primary component carrier. For example, after obtaining the system information of the carrier D, the carriers eight, B, C, and D are still monitored, and then A, B, C, and D are updated. The main component carrier, that is, carrier D is the true primary component carrier, and is no longer a temporary primary component carrier. Of course, the UE can also monitor the updated main component carriers A, B, and D, which is not limited in this embodiment.

 The number of updated primary component carriers may be greater than the original primary component carrier number, as long as the number of updated primary component carriers is not greater than the number of component carriers that the system can configure for the UE. For example, when the UE can only listen to a maximum of 3 carriers, the number of updated primary CCs cannot exceed 3. It is assumed that the UE can only listen to one carrier. At this time, there is only one carrier in the main component carrier set, and the main component carrier is A. When the system information update occurs on the carrier B, the carrier B can be temporarily used as the main component carrier. Listening, that is, replacing the original main component carrier A with the carrier B, that is, stopping listening to the main component carrier A, and the monitoring carrier can recover the original main component carrier A after receiving the system information of the carrier B, and no longer monitor the carrier B; After obtaining the system information of the carrier B, another updated main component carrier C can be monitored.

In the embodiment corresponding to FIG. 1a, FIG. 1b or FIG. 2, the system information may include: main system information and other system information other than the main system information. The embodiment may further include: acquiring primary system information of one or more other component carriers at a fixed time-frequency location, and obtaining scheduling information of other system information other than the primary system information and corresponding system information by blind detection. . Specifically, the method may include: obtaining indication information of whether the primary system information is changed, the indication information further indicating, when the identifier of the changed CC is indicated, whether the CC in which the system information change occurs is only a change of the MIB information. If the UE learns that the changed system information is the main system information, the UE may directly transmit the main system. The updated main system information is obtained at the corresponding time-frequency position of the unified information, thereby avoiding unnecessary CSS space search and reducing blind detection complexity.

 FIG. 3 is a schematic diagram of still another method for updating system information according to an embodiment of the present invention, where the method includes:

 S31: The base station sends an indication message of the system information change to the user equipment, to indicate a component carrier whose system information changes. In a specific application, the indication message may be a paging message, and specifically, an identifier of a CC in which a system information change may be added in a paging message of an existing LTE system, and a paging message after the identifier is added As an indication message of system information change.

 S32: The user equipment determines whether the number of component carriers whose system information is changed is 1, if yes, execute S33; otherwise, execute S36.

 S33: The user equipment determines whether the component carrier in which the system information change occurs is the main component carrier. If yes, execute S34, otherwise execute S35.

 S34: The user equipment acquires scheduling information of system information on a common search space of the primary component carrier, and updates system information of the primary group carrier in a system information change period. The scheduling information of the system information is used to indicate the time-frequency location of the updated system information.

 S35: The user equipment # indicates that the system information change is switched to the component carrier where the system information change occurs, and the scheduling information of the system information is acquired in the common search space of the switched component carrier, and the handover is updated in the system information update period. After the system information of the component carrier.

 S36: The user equipment detects a common search space of the plurality of component carriers whose system information is changed by means of time division multiplexing to update system information of the plurality of component carriers. After updating the system information of multiple CCs, the UE returns to its primary CC and continues to listen to the CSS space of the primary CC.

In a specific implementation, the UE detects the system information by means of time division multiplexing. The UE may find the frame number of the system information starting to change based on the SFN (System Frame Number) mod (module) m - 0. During the system information change period, the UE completes the update process of the system information of multiple CCs in m radio frames, and the update manner thereof may be as follows: If the number of changed CCs is H, then when SFN mod H = N, the system information of the second (Ν=0..·Η-1) CCs is updated, where SFN is greater than or equal to k, where k is The starting frame number of the system information change period.

 In another specific implementation, the UE may join the primary CC to the CC set that alternately searches for CSS. When SFN mod ( H+1) = N, the UE listens to the CSS space of the Nth (N = 0 ... H) CCs. If the Nth CC is a CC in which system information changes, the UE updates its system information.

 It should be noted that there may be other implementations of process S36. FIG. 4 is a schematic diagram of still another method for updating system information according to an embodiment of the present invention. In the method, processes S41 to S45 are the same as processes S31 to S35. Process S46 is different from S36 in Figure 3. S46 includes: the user equipment monitors a common search space of the component carriers that change the main component carrier and the system information by means of time division multiplexing, so as to update system information of the component carriers whose system information changes. After the system information is updated, the UE returns to the primary CC and continues to listen to the CSS space of the primary CC. Alternatively, the UE may also change its primary CC after the system information is updated.

 It should be noted that, in the foregoing embodiment, when the eNB (eNodeB, base station) ensures that the number of CCs in which the system information change occurs within one system information update period is not greater than 1, or if the eNB can guarantee multiple CCs When the system information is not changed at the same time, the step of the UE determining the number of CCs in which the system information changes in S32 may be omitted, which is not limited in this embodiment. For the primary CC in this embodiment, the UE searches for its CSS space. For the determining method of the primary CC, the embodiment is not limited. For example, the primary CC may be a CC selected by the UE from multiple CCs, or may be a CC designated by the eNB for the UE. In case the UE selects the primary CC by itself, the UE may report the selected primary CC to the eNB. In addition, if the eNB considers that the primary CC selected by the UE is not suitable, it may also re-designate a primary CC for the UE. This embodiment does not limit the determining process of the primary CC.

In addition, in the system information of this embodiment, the Master System Information Block (MIB) may be sent at a fixed time-frequency location instead of being obtained by scheduling. Take it. That is to say, the UE does not need to detect the CSS space of the CC when acquiring the primary system information of a certain CC, so when the primary system information changes, the UE can directly obtain the changed system information from the fixed time-frequency location. In the existing system, the update of the main system information is not distinguished from the update of other system information, but the UE information is generally notified to the UE to update the system information, which may cause the UE to access the CSS space. Make unnecessary searches. Therefore, in this embodiment, optimization can be performed to avoid the influence of the main system information update on the UE. The optimization method is: in the indication message of the system information change (specifically, the paging message of the existing LTE system can be used as the indication message), whether the indication information of the change is changed, that is, the identifier of the CC indicating the change is indicated. At the same time, it further indicates whether the CC in which the system information change occurs is only a change in the information. When the UE learns that the changed system information is the ΜΙΒ information of a certain CC according to the indication information of the system information change, the UE may directly update the CC information of the corresponding CC without searching the CSS space of the CC, of course, The case where the system information changes the irrelevant other purpose and the UE needs to search the CSS space of the CC is not considered in the scope of the present invention.

In the foregoing embodiment, the system information update is performed on the CC, and the number of times the UE blindly detects the PDCCH search space is minimized, and the power consumption of the UE can be effectively reduced. In still another embodiment of the present invention, the UE may listen to CSS spaces of multiple CCs, and the monitored multiple CCs are a subset of all CCs used by the UE. For convenience of description, those CCs in which the UE listens to the CSS space are referred to as primary CCs. The number of CCs that the UE can simultaneously monitor the CSS space may be set by the system, or may be set by the eNB according to the capabilities of the UE, or the UE may set itself according to its capabilities. When the value of M is set by the eNB, the eNB may notify the UE of the M value by using a dedicated message when the UE establishes an RRC (Radio Resource Control) connection with the eNB. When the value of M is set by the UE, the UE may report the M value to the eNB when establishing an RRC connection with the eNB. The M value may also be stored in the core network. When the UE establishes an RRC connection with the eNB, the eNB may obtain this value from the core network. The M value may also be specified by the system, and the eNB notifies the UE by using a broadcast message, or the M value may be fixedly configured in the system. The number M of main CCs that can be monitored in this embodiment satisfies: 1 ≤ M ≤ S, S is The number of all CCs currently used by the UE. In particular, when M = 1, that is, there is only one primary CC, this case has been described in the previous embodiment, which is mainly for the case where M is greater than one. During the data transmission between the UE and the eNB, the number of CCs that the UE actually listens to the CSS space may be less than or equal to M, that is, J≤M.

 For ease of understanding, specific description will be made below with reference to the accompanying drawings. FIG. 5 is a schematic diagram of still another method for updating system information according to an embodiment of the present invention, where the method includes:

 S51: The base station sends an indication message of the system information change to the user equipment, to indicate that the system information changes the component carrier. In a specific application, the indication message may be a paging message, and specifically, an identifier of a CC in which a system information change may be added in a paging message of an existing LTE system, and a paging message after the identifier is added As an indication message of system information change.

 S52: The user equipment determines whether the number of component carriers H whose system information is changed is less than or equal to M. If yes, execute S53; otherwise, execute S58.

 S53: The user equipment determines whether the H component carriers that have changed the system information are all the main component carriers, and if yes, execute S54; otherwise, execute S55.

 S54: The user equipment acquires scheduling information of the system information from a common search space of the primary component carrier, and updates system information of the primary group carrier in a system information change period.

 S55: The user equipment determines whether J+H is less than or equal to M, and if yes, executes S56; otherwise, executes

S57.

 S56: The user equipment obtains scheduling information corresponding to the system information of the component carrier from the common search space of the component carriers that have changed the system information, and updates the system information of the component carrier that changes the system information in the system information update period.

S57: The user equipment alternately detects a common search space of the component carriers that change the system information information by using time division multiplexing in a system information change period to update system information of the H component carriers. When the time division multiplexing mode is adopted, the UE detects the CSS space of one or more CCs in each time interval, but the UE detects that the number of all CCs in the CSS space does not exceed M in a certain time interval. S57 may also have the following alternative implementation manner. The UE selects (J + H ) - M^CC from the J CCs that listen to the CSS space, stops listening to the CSS space of the selected CC, and searches for H CCs that have changed system information. CSS space to update the system information of the H CCs. After the update is complete, the UE may return to the previous J primary CCs to listen to the CSS space. Alternatively, the UE may also update the current set of primary CCs, that is, increase, decrease, or change the CCs in the primary CC set. Specifically, the update process of the primary CC set may be based on an indication of the eNB, or may be determined by the UE itself.

 S58: The user equipment detects the common search space of the component carriers that have changed the system information by using time division multiplexing in the system information change period, and updates the system information of the H component carriers. In the time division multiplexing mode, the UE detects the CSS space of one or more CCs in each time interval, but the UE detects the number of CCs in the CSS space does not exceed M in a certain time interval. After the update is complete, the UE may return to the previous J primary CCs to detect the CSS space; or, the UE may also update the previous set of primary CCs, that is, increase, decrease or change the CCs in the primary CC set. Specifically, the update process of the primary CC set may be based on an indication of the eNB, or may be determined by the UE itself.

 In a specific implementation, the time division multiplexing manner may be: the UE finds a frame number whose system information starts to change based on SFN mod m = 0; and the UE generates the system in m radio frames during the system information change period. The system information of the changed CC is updated and can be updated as follows:

 H

When the number of CCs in which the system information changes is H, the H CCs are divided into Q groups, and the H CCs are

 M

 H

The system information is updated in groups, indicating rounding up. That is, when SFN mod Q = N,

 M M

The system information of the Nth (N=0 ... Q-1) group CC is updated, where SFN is greater than or equal to k, where k is the starting frame number of the system information change period. In addition, in the time division multiplexing mode, the UE may also add the J primary CCs that are being monitored to the time division multiplexed listening mode.

Step by step, when the packet is updated, the number of CCs in each group does not exceed M, but specifically, which CC should be assigned to which group can be unqualified.

The J primary CCs in this embodiment may be selected by the UE from multiple CCs, or It is the eNB that is specified for the UE. In case the UE selects the primary CC by itself, the UE may report the selected primary CC to the eNB. If the eNB considers that the primary CC selected by the UE is not suitable, the primary CC may be re-designated for the UE, which is not limited in this embodiment.

 In this embodiment, in the indication message of the system information change (specifically, the paging message of the existing LTE system may be used as the indication message), whether the indication information that the MIB changes, that is, the CC indicating the change is added, is added. The identifier further indicates whether the CC in which the system information change occurred is merely a change in the MIB information. When the UE information indicating that the changed system information is the MIB information of a certain CC, the UE may directly update the MIB information of the corresponding CC without searching the CSS space of the CC.

 In the above embodiment, the system information update is performed on the CC, and the number of times the UE blindly detects the PDCCH search space is minimized, which can effectively reduce the power consumption of the UE.

 FIG. 6 is a schematic diagram of still another method for updating system information according to an embodiment of the present invention, where the method includes:

 S61 a: listening to the common search space of the main component carrier;

 S62a: when detecting the scheduling information of the system information update broadcast message, acquiring the system information update broadcast message according to the indication of the scheduling information, or

 When the scheduling information of the paging message is detected, the paging cancellation ii is obtained according to the indication of the scheduling information.

S63a: Obtain, from the system information update broadcast message or the paging message, a system information update value of one or more component carriers in which the system information change occurs.

 In this embodiment, the system information update value of the component carrier is obtained by updating the broadcast message or the paging message by the system information, thereby obtaining updated system information, and the complexity of the blind detection can be reduced without monitoring the CSS space of the corresponding CC.

For the CC, the system information update value is a change value of its updated system information relative to its original system information. In other words, the information that has not changed in the system information of the CC is not It will be sent to the UE in the system information update broadcast message or paging message. The obtaining, by the system information update broadcast message or the paging message, the system information update value of the one or more component carriers that generate the system information change may include: acquiring the occurrence from the system information update broadcast message or the paging message One or more component-specific system information update values of the system information change; further comprising: obtaining a common system information update value of the component carriers by monitoring a common search space of the primary component carrier.

 In this embodiment, the update of the system information may be divided into two parts, and the part is the system information common to the component carriers, that is, the system information that constitutes the carrier common. Specifically, the public system information may refer to that the multiple component carriers can be shared. Or system information with the same information. The other part is the system information specific to each component carrier, that is, the system information constituting the carrier specific. Specifically, the specific system information may refer to system information that is independent of each other or different from each other. For the common system information of each component carrier, the UE may obtain the updated content of the public system information from any component carrier that is currently listening to its CSS space, for example, the primary CC. For another part of the CC-specific system information, when a certain CC-specific system information is changed, the specific system information update value of the CC may be included in the system information update broadcast message or the paging message and sent to the system information update broadcast message or the paging message. UE. By monitoring the primary CC to obtain the public system information update value, the system information update broadcast message or the paging message may include only one or more specific system information update values that constitute the carrier, so that the size of the corresponding message may be further reduced to save air interface resources. . It can be understood that the change value of the CC-specific system information may also be notified to the UE by dedicated RRC (Radio Resource Control) signaling, the difference being that the dedicated RRC signaling is specifically sent to a certain or some Some UEs are sent instead of broadcast.

The obtaining, by the system information update broadcast message or the paging message, the system information update value of the one or more component carriers that generate the system information change may include: acquiring the occurrence from the system information update broadcast message or the paging message The updated value of the emergency system information of one or more component carriers that are changed by the system information, or the updated value of one or more component carrier-specific emergency system information that constitutes the carrier. The eNB may also pass the updated value of the urgent system information through the system information broadcast message and the paging message. Or the RRC dedicated signaling notifies the UE. The urgent system information refers to system information closely related to data transmission carried by dedicated RRC signaling, such as an RRC connection reconfiguration message, when a new CC is configured for a UE or a new CC is activated. Emergency system information can also be further divided into specific emergency system information and public emergency system information. When configuring a new CC for a UE or activating a new CC, the base station may perform UE-related RRC signaling, such as an RRC connection reconfiguration message, carrying the emergency system information closely related to the data transmission and composing carrier-specific information. The specific emergency system information is obtained by the dedicated RRC signaling; the UE may extract the emergency system information that is common to the carrier from the primary carrier, that is, the emergency system information that is common to the carrier may not be sent to the UE in the dedicated RRC signaling. Through the above process, the UE can obtain the updated value of the urgent system information without blind detection, or form the carrier-specific system information update value.

 The UE may acquire scheduling information of the system information update broadcast message or the paging message, and acquire the system information update broadcast message or the paging message according to the indication of the scheduling information. In order to improve the reliability of the scheduling information, a scrambling and descrambling process may be introduced. For example, the UE may use a radio network temporary identifier to descramble the physical downlink control channel of the system information update broadcast message or the paging message scheduling information to obtain a system. The information updates the broadcast message or the scheduling information of the paging message, acquires the system information update broadcast message or the paging message according to the indication of the scheduling information, and obtains one or more component carrier updates from the system information update broadcast message or the paging message. System information. In this embodiment, the UE may receive the system information to update the broadcast message or the paging message in any of the following two ways:

 a. The UE uses SIU-RNTI (or P-RNTI) to detect scheduling information of a system information broadcast message (or paging message) in each transmission time interval, and receives the system information to update a broadcast message or a paging message; Here, the SIU-RNTI (or P-RNTI) may be a wireless network temporary identifier used in message scrambling and descrambling when transmitting and receiving system information update broadcast messages (or paging messages).

b. The UE first receives the notification of the change of the system information, and after receiving the notification of the change of the system information of one or more CCs, the UE starts to use the SIU-RNTI (or P-RNTI) to detect the system information widely. Scheduling information of a message (or paging message), and receiving the system information to update a broadcast message or a paging message.

 In this embodiment, the manner in which the eNB sends the system information to update the broadcast message or the paging message may be in any of the following two ways:

 a. When the eNB transmits a system information update broadcast message or a paging message by using a component carrier (for example, component carrier A), the system information update broadcast message or the paging message includes a plurality of component carriers that generate system information changes (when the component carrier is formed) When the system information of A changes, the component carriers that change the system information also include the updated value of the system information that constitutes the carrier A). b. When the eNB sends a system information update broadcast message or a paging message by using a component carrier (for example, component carrier A), the system information update broadcast message or the paging message includes a component of the generated system information change other than the component carrier A. The updated value of the carrier's system information. In this embodiment, the updated value of the system information may include any one of the following information: 1. The system information update value of the component carrier mentioned in the foregoing embodiment;

 2. The carrier-specific system information update value mentioned in the foregoing embodiment;

 3. The urgent system information update value of the component carrier mentioned in the foregoing embodiment;

4. The carrier-specific emergency system information update value mentioned in the foregoing embodiment. FIG. 6b is a schematic diagram of still another method for updating system information according to an embodiment of the present invention, where the method includes:

 S61b: embedding system information update values of one or more component carriers into a system information update broadcast message or a paging message;

 S62b: Send the system information to update a broadcast message or a paging message.

When transmitting the system information update broadcast message or the paging message, the embodiment carries the system information update value of one or more component carriers in which the system information change occurs, so that the UE can obtain the system information update without blind detection. The value, thereby obtaining updated system information, reduces the complexity of blind detection. The base station can embed specific system information update values of one or more component carriers into the system information. Updating the broadcast message or sending the paging message; when the public system information changes, transmitting the system information change indication information to the user equipment, instructing the user equipment to obtain the public system information update value from the common search space of the current primary component carrier. The base station may also embed the updated value of the emergency system information of the component carrier of the one or more component carriers in the system information update broadcast message or the paging message, so that the UE can obtain the updated value of the emergency system information without blind detection. Since only one or more specific system information update values constituting the carrier are carried in the system information update broadcast message or the paging message, the public system information update value does not need to be carried, and the system information update broadcast message or the paging message size can be reduced, saving Air interface resources. It can be understood that the above system information update broadcast message can be replaced by dedicated RRC signaling, except that the system information update value is sent by dedicated signaling instead of broadcast signaling.

 In this embodiment, the updated value of the system information may include any one of the following information:

1. The system information update value of the component carrier mentioned in the foregoing embodiment;

 2. The carrier-specific system information update value mentioned in the foregoing embodiment;

 3. The urgent system information update value of the component carrier mentioned in the foregoing embodiment;

4. The carrier-specific emergency system information update value mentioned in the foregoing embodiment. The base station may use the radio network temporary identifier to scramble and transmit the physical downlink control channel PDCCH of the system information update broadcast message or the paging message scheduling information, thereby improving the security and reliability of message transmission.

In a specific implementation, when the eNB needs to update system information of one or more CCs, the eNB may send a system information update broadcast message to the UE, where the system information update broadcast message includes one or more items that need to update system information. The identifiers of the CCs and the system information of these CC changes. In order to save system overhead, information that does not change CC for those system information may not be broadcast. The system information update broadcast message scheduling information, that is, the scheduling system information update broadcast message, and the PDCCH (Physical Downlink Control Channel) of the message may be performed by using one RNTI (Radio Network Temporary Identity). Scrambling transmission, which can be referred to herein as System Information Update RNTI (SIU-RNTI). The SIU-RNTI The UE may be notified in the system broadcast message, or may be notified by the eNB in a system broadcast message, after the UE establishes a connection with the eNB. The UE may listen to the CSS space of the primary CC. When the system information is updated to update the scheduling information of the broadcast message, the corresponding system information update broadcast message may be read according to the indication of the scheduling information, and the updated system information of one or more CCs is obtained. In order to save the power consumption of the UE, the UE may not acquire system information of the CC that it does not currently use. If the eNB uses the SIU-RNTI to scramble the scheduling information of the system information update broadcast message, the UE side needs to use the SIU-RNTI to descramble the PDCCH of the scheduling system information update broadcast message to obtain the scheduling of the system information update broadcast message. information. For determining the effective start time of the change of the system information of the CC, the following manner may be adopted: The eNB explicitly indicates the start time of the system information of the CC to start changing in the system information update broadcast message. Alternatively, the timer may be used to determine, that is, when the UE receives the system information update broadcast message, the UE may start a timer, and when the timer reaches the preset time, the UE updates the system information of the CC; A timer may be started when the system information is updated to send a broadcast message, and when the timer reaches the preset time, the eNB changes the system information of the CC. Alternatively, the start time of the system information start change may also be determined in a manner of determining the system information change period in the prior art, that is, when the SFN mod m = 0, the system information of the CC starts to change. In this embodiment, not all UEs need to perform the update process. For example, some UEs work under one CC, and it is not necessary to update system information of other CCs. At this time, the UE may be optimized as follows: When the UE works in multiple When the CC is used, the SIU-RNTI may be used to perform blind detection and descrambling on the PDCCH for scheduling system information update broadcast messages. When the UE works in a single CC, the UE does not use the SIU-RNTI to perform the blind detection and descrambling. .

The above embodiment mode may also have the following modifications. When the eNB needs to update system information of one or more CCs, the eNB may send a paging message to the UE, where the paging message includes an identifier of one or more CCs whose system information needs to be updated, and corresponding changes occur. System information. In order to save system overhead, in the system information of each CC, information that has not changed may not be transmitted. The scheduling information of the paging message, that is, the scheduling paging message, the PDCCH of the scheduling paging message The P-RNTI (Paging RNTI, Paging Radio Network Temporary Identifier) of the current LTE system can be used for scrambling and transmission. The UE monitors the CSS space of the primary CC. When the scheduling information of the paging message is detected, the UE instructs to read the corresponding paging message according to the scheduling information, and acquires the updated system of the CC in which the system information change occurs from the paging message. information. In order to save the power consumption of the UE, for the system information of the CC that the UE does not currently use, the UE may ignore the processing. In addition, the effective start time for the system information change of the CC may also be similar to the previous processing mode. For example, the eNB may explicitly indicate in the paging message the start time at which the system information of the CC in which the system information change occurs begins to change. Or determining, by using a timer, an effective start time of the system information change, that is, when the UE receives the paging message, starting a timer, and updating the system information of the CC when the timer reaches the preset time; The eNB may also start a timer when the paging message is sent. When the timer reaches the preset time, the eNB changes the system information of the CC. Alternatively, the manner in which the system information change period is determined in the prior art may be used, that is, when the SFN mod m = 0, the system information of the CC is changed. In this embodiment, not all UEs need to perform the update process. For example, some UEs work under one CC, and it is not necessary to update system information of other CCs. At this time, the UE may be optimized as follows: When the UE works in multiple When the CC is used, the PDCCH for scheduling the paging message may be descrambled by using the P-RNTI. When the UE works in a single CC, the descrambling may be performed without using the P-RNTI, but the same as the prior art. The system information of a single CC that is currently working is updated by reading the value tag in the SIB1 (System Information Block 1). This embodiment does not specifically describe this. Alternatively, when the UE works in a single CC, the scheduling information of the paging message may also be obtained by using P-RNTI descrambling, but when the UE finds that the CC of the system information changed from the paging message is not the CC currently used by the UE. The subsequent information field of the paging message can be ignored.

 Figure 7a is a schematic diagram of a user equipment according to an embodiment of the present invention. The user equipment includes: a first obtaining unit 71a, configured to learn that one or more other component carriers have changed system information, the one or more The other component carriers are component carriers other than the main component carrier;

a first monitoring unit 72a, configured to alternately search the one or more of them by means of time division multiplexing It constitutes a common search space of the carrier and the at least one primary component carrier to acquire scheduling information of the system information of the one or more other component carriers and updated system information.

 The user equipment in this embodiment alternately searches for other component carriers and main component carriers whose system information is changed by means of time division multiplexing, which can reduce the complexity of system blind detection while updating the information of the carrier system. The first intercepting unit 72a is further configured to: keep the common search space of the remaining primary component carriers, and the remaining primary component carriers are other primary component carriers other than the at least one primary component carrier. The user equipment may further include: a primary system information acquiring unit, configured to acquire primary system information of one or more other component carriers at a fixed time-frequency location of the one or more other component carriers.

 Figure 7b is a schematic diagram of a user equipment according to an embodiment of the present invention. The user equipment includes: a second acquiring unit 71b, configured to learn that system information of a plurality of other component carriers is changed, where the plurality of other component carriers are a component carrier other than the main component carrier;

 a second monitoring unit 72b, configured to alternately search a common search space of the plurality of other component carriers in a time division multiplexing manner while acquiring a common search space of the primary component carrier to obtain the plurality of other component carriers Scheduling information of system information and updated system information.

 The difference from the user equipment in FIG. 7a is that the user equipment in this embodiment keeps listening state to the current main component carrier of the system, and alternately monitors multiple other component carriers whose system information is changed by using time division multiplexing mode. It is not necessary to simultaneously monitor multiple component carriers whose system information changes at the same time, and reduce the complexity of system blind detection while updating the carrier system information. The user equipment may further include: a main system information acquiring unit, configured to acquire a time-frequency location of receiving the main system information, and acquire main system information of the other component carriers at the time-frequency position.

 FIG. 8 is a schematic diagram of a user equipment according to an embodiment of the present invention. The user equipment includes: a third acquiring unit 81, configured to learn, that one or more other component carriers have changed system information, the one or more The other component carriers are component carriers other than the main component carrier;

a third monitoring unit 82, configured to monitor a common search space of the one or more other component carriers, to obtain scheduling information of the system information of the one or more other component carriers, and an updated system The system information, after obtaining system information of one or more other component carriers, monitors a common search space of the primary component carrier or the updated primary component carrier.

 In this embodiment, the user equipment monitors the system information of one or more other component carriers that have changed the system information, and listens to the main component carrier after updating the system information. The third listening unit 82 may further include: a first listening module configured to replace one or more primary component carriers with the one or more other component carriers to listen to the one or more other component carriers Public search space. The third listening unit 82 can also further include: a second listening module configured to join the one or more other component carriers to the primary component carrier set to listen to the common search space of the one or more other component carriers. The user equipment may further include: a primary system information acquiring unit, configured to acquire primary system information of one or more other component carriers at a fixed time-frequency location of one or more other component carriers.

 FIG. 9 is a schematic diagram of a user equipment according to an embodiment of the present invention. The user equipment includes: a fourth monitoring unit 91, configured to monitor a common search space of a primary component carrier;

 The scheduling information acquiring unit 92 is configured to: when detecting the scheduling information of the system information update broadcast message, acquire the system information update broadcast message according to the indication of the scheduling information, or

 When the scheduling information of the paging message is detected, the paging message is obtained according to the indication of the scheduling information;

 The system information obtaining unit 93 is configured to acquire, from the system information update broadcast message or the paging message, a system information update value of one or more component carriers in which the system information change occurs.

The user equipment in this embodiment obtains updated system information of one or more component carriers by updating the broadcast message or the paging message by the system information of the primary component carrier, and does not need to monitor the CSS space of the corresponding CC, thereby reducing the complexity of the blind detection. The system information obtaining unit 93 may further include: a descrambling module configured to descramble the physical downlink control channel of the scheduling information of the system information update broadcast message or the paging message by using the wireless network temporary identifier to obtain system information update Scheduling information of a broadcast message or a paging message, and acquiring a system information update broadcast message or a paging message according to the indication of the scheduling information, The updated system information of one or more component carriers is obtained from the system information update broadcast message or the paging message.

 FIG. 10 is a schematic diagram of a base station according to an embodiment of the present invention. The base station includes: a message generating unit 101, configured to embed one or more system information update values of a component carrier into a system information update broadcast message or a paging message. ;

 The message sending unit 102 is configured to send the system information update broadcast message or paging message. When the base station sends the system information to update the broadcast message or the paging message, the corresponding message carries the updated system information of one or more other component carriers, and the UE does not need to blindly detect the CSS of other CCs, thereby reducing the complexity of blind detection. degree. The message sending unit 102 may further include: a scrambling module, configured to scramble and transmit the physical downlink control channel PDCCH of the scheduling information of the system information update broadcast message or the paging message by using a wireless network temporary identifier, so that The message sending unit 102 can transmit the PDCCH of the scrambled scheduling information, thereby improving the security and reliability of message transmission.

 A person skilled in the art can understand that all or part of the processes in the above method embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium, and the program is executed. At the time, the flow of the embodiment of each of the above methods may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

 The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of the present invention. And variations are also considered to be within the scope of the invention.

Claims

Rights request A method for updating system information, comprising:  Listening to the common search space of the main component carrier;  When the system information is updated to update the scheduling information of the broadcast message, the system information update broadcast message is obtained according to the indication of the scheduling information, or  When the scheduling information of the paging message is detected, the paging message is obtained according to the indication of the scheduling information;  A system information update value of one or more component carriers in which a change in system information occurs is obtained from the system information update broadcast message or the paging message.  The method according to claim 1, wherein the obtaining, by the system information update broadcast message or the paging message, the system information update value of one or more component carriers in which the system information change occurs may include: Obtaining one or more component carrier-specific system information update values that cause system information changes from the system information update broadcast message or the paging message;  The method also includes obtaining one or more system information update values common to the constituent carriers by listening to a common search space of the primary component carrier.  The method according to claim 1, wherein the obtaining, by the system information update broadcast message or the paging message, the system information update value of one or more component carriers in which the system information change occurs may include: An update value of the emergency system information of one or more component carriers in which the system information change occurs is obtained from the system information update broadcast message or the paging message.  4. A method for updating system information, comprising:  Embedding one or more system information update values of component carriers into a system information update broadcast message or a paging message;  Sending the system information to update a broadcast message or a paging message. The method according to claim 4, wherein the embedding the system information update value of one or more component carriers in the system information update broadcast message or the paging message comprises: The component carrier-specific system information update value of the plurality of component carriers is embedded in the system information update broadcast message or the paging message;  The method further includes: when the public system information changes, transmitting system information change indication information to the user equipment, instructing the user equipment to obtain a public system information update value from the primary component carrier.  The method according to claim 4, wherein the embedding the system information update value of one or more component carriers in the system information update broadcast message or the paging message comprises: one or more component carriers The updated value of the emergency system information constituting the carrier is embedded in the system information update broadcast message or the paging message.  7. A method for updating system information, comprising:  Knowing that the system information of one or more other component carriers is changed, the one or more other component carriers are component carriers other than the primary component carrier;  Monitoring a common search space of the one or more other component carriers to acquire scheduling information of system information of the one or more other component carriers and updated system information;  After obtaining system information for one or more other component carriers, the common search space of the primary component carrier or the new primary component carrier is monitored.  8. The method according to claim 7, wherein the listening to the common search space of one or more other component carriers comprises: replacing one or more primary component carriers with the one or more other component carriers, To listen to the common search space of the one or more other component carriers.  The method according to claim 7, wherein the monitoring the common search space of one or more other component carriers comprises: adding the one or more other component carriers to the main component carrier set to listen to the A common search space for one or more other component carriers.  10. A method for updating system information, comprising:  Knowing that the system information of one or more other component carriers is changed, the one or more other component carriers are component carriers other than the primary component carrier; Alternatingly searching the one or more other component carriers and at least one by time division multiplexing The main constituent space of the carrier constitutes the scheduling information of the system information of the one or more other component carriers and the updated system information.  The method according to claim 10, wherein when the common search space of the one or more other component carriers and the at least one primary component carrier is alternately searched in a time division multiplexing manner, the method further includes : keeping the common search space of the remaining primary component carriers, and the remaining primary component carriers are other primary component carriers other than the at least one primary component carrier.  12. A method for updating system information, comprising:  Obtaining that the system information of the plurality of other component carriers is changed, and the plurality of other component carriers are component carriers other than the main component carrier;  While maintaining the common search space of the main component carrier, the common search space of the plurality of other component carriers is alternately searched in a time division multiplexing manner to acquire scheduling information and update information of the system information of the plurality of other component carriers. System information.  13. A user equipment, comprising:  a fourth monitoring unit, configured to monitor a common search space of the primary component carrier;  a scheduling information acquiring unit, configured to: when the system information is updated to update the scheduling information of the broadcast message, acquire the system information update broadcast message according to the indication of the scheduling information, or  When the scheduling information of the paging message is detected, the paging information is obtained according to the indication of the scheduling information. The system information acquiring unit is configured to obtain, from the system information update broadcast message or the paging message, the system information change. One or more system information update values that make up the carrier.  A base station, comprising:  a message generating unit, configured to embed one or more system information update values of the component carrier into a system information update broadcast message or a paging message of the primary component carrier;  a message sending unit, configured to send the system information to update a broadcast message or a paging message. 15. A user equipment, comprising: a third acquiring unit, configured to learn, that the system information of one or more other component carriers is changed, where the one or more other component carriers are component carriers other than the primary component carrier;  a third monitoring unit, configured to listen to the common search space of the one or more other component carriers, to retrieve scheduling information of the system information of the one or more other component carriers, and updated system information, in obtaining one or After a plurality of other system information constituting the carrier, the common search space of the primary component carrier or the updated primary component carrier is monitored.  The user equipment according to claim 15, wherein the third intercepting unit comprises: a first listening module configured to replace one or more main component carriers with the one or more other component carriers To listen to the common search space of the one or more other component carriers.  17. A user equipment, comprising:  a first acquiring unit, configured to learn, that the system information of one or more other component carriers is changed, where the one or more other component carriers are component carriers other than the primary component carrier;  a first monitoring unit, configured to alternately search a common search space of the one or more other component carriers and at least one primary component carrier by using time division multiplexing to obtain system information of the one or more other component carriers Scheduling information and updated system information.  18. A user equipment, comprising:  a second acquiring unit, configured to learn, that the system information of the plurality of other component carriers is changed, where the plurality of other component carriers are component carriers other than the main component carrier;  a second monitoring unit, configured to alternately search a common search space of the plurality of other component carriers by using a time division multiplexing manner while acquiring a common search space of the primary component carrier to acquire the plurality of other component carriers Scheduling information of system information and updated system information.