CN101540978A - Downlink component carrier wave identification method, synchronous downlink component carrier wave reporting method and device - Google Patents

Abstract

The invention discloses a downlink component carrier identification method: the system information of each downlink component carrier in a group of downlink component carriers includes at least the frequency point information of the downlink component carrier carrying the random access response, or includes the The frequency point and bandwidth information of the downlink component carrier receiving the response; or at least including the identification information of the downlink component carrier carrying the random access response, and the identification information of each downlink component carrier and its frequency point information or each downlink component carrier The identification information, frequency points and their bandwidth information. Alternatively, the corresponding relationship between each downlink component carrier in a group of downlink component carriers and the random access preamble sequence is set, and the system information of each downlink component carrier in a group of downlink component carriers includes at least its own identification information, a set of Information about the number of downlink component carriers in the downlink component carriers. The invention also discloses a method and device for reporting synchronous downlink component carriers. The invention is simple and practical to realize.

Description

Downlink component carrier identification method, synchronous downlink component carrier reporting method and device

technical field

The present invention relates to the identification and reporting technology of downlink component carriers, and in particular to a method for identifying downlink component carriers in an Advanced Long Term Evolution system (LTE-A, Long Term Evolution-Advanced) and a method and device for reporting synchronous downlink component carriers.

Background technique

The LTE-A system is a next-generation evolution system of the Long Term Evolution (LTE, Long Term Evolution) system. Figure 1 is a schematic diagram of the relationship between carrier aggregation and component carriers in the LTE-A system. As shown in Figure 1, the LTE-A system uses carrier aggregation (Carrier Aggregation, also known as carrier aggregation) technology to expand the transmission bandwidth to obtain higher data rate. Each aggregated carrier is called a component carrier (ComponentCarrier). Component carriers can be contiguous or non-contiguous in frequency spectrum.

The downlink transmission bandwidth of the LTE-A system is aggregated by multiple downlink component carriers; the uplink transmission bandwidth may only include one uplink component carrier, or may be aggregated by multiple uplink component carriers. That is, the uplink and downlink bandwidths of the system may contain different numbers of component carriers. Even if the number of uplink and downlink component carriers in the system is the same, for a user terminal (UE, User Equipment), the number of component carriers included in the downlink receiving bandwidth may be different from the number of component carriers included in the uplink sending bandwidth. The situation that the number of uplink and downlink component carriers is not equal is called asymmetric carrier aggregation.

The downlink component carrier of the LTE-A system can send a synchronization signal (Synchronization Signal) and carry a broadcast channel. Here, the "broadcast channel" on a downlink component carrier refers to the channel that carries the broadcast messages of a certain component carrier or several component carriers or the entire cell. Received by all user terminals with the same attribute. In addition, the broadcast channel may refer to a physical channel of the physical layer, or may refer to a transport channel of the medium access control sublayer (MAC sublayer) or a logical channel of the radio resource management sublayer (RRC, Radio Resource Control) layer. . The broadcast message carried by the broadcast channel is also called system information (SystemInformation).

The system information of the LTE system is carried by a master information block (MIB, Master Information Block) and a series of system information blocks (SIB, System Information Block). Among them, the MIB includes some basic system information, including downlink system bandwidth, physical downlink HARQ indicator channel (PHICH) configuration information, system frame number and so on. The MIB is sent periodically on the Physical Broadcast Channel (PBCH, Physical Broadcast Channel).

The SIB is divided into 11 categories (SystemInformationBlockType 1~11) according to the content, and is sent on the Physical Downlink Shared Channel (PDSCH, Physical Downlink Shared Channel). Among them, SystemInformationBlockType2 (SIB-2) includes the radio resource configuration information of the cell (radioresource configuration information), including frequency point information of the uplink carrier (can be defaulted), uplink system bandwidth, and random access configuration parameters.

Figure 2 is a flow chart of random access in the LTE system, as shown in Figure 2, the user terminal is on the selected Physical Random Access Channel (PRACH, Physical Random Access Channel) according to the random access configuration parameters in SIB-2 Send a random access preamble (Random Access Preamble) to the base station. After receiving the random access preamble, the base station uses the random access preamble sequence to calculate the timing advance, and allocates channel resources and cell radio network temporary identification numbers (C-RNTI, Cell Radio Network Temporary Identifier), sent through the physical downlink shared channel, called Random Access Response (Random Access Response). After receiving the random access response, the user terminal sends the first scheduled uplink transmission (First scheduled UL transmission, abbreviated as scheduled transmission) on the physical uplink shared channel (PUSCH, Physical Uplink Shared Channel) according to the channel resource allocation information in the random access response , also known as Message 3, abbreviated as Msg 3). Msg 3 contains different information according to different events that trigger the random access process, including, for example, RRC Connection Request (RRC Connection Request), C-RNTI and so on. When the random access process is based on contention, the base station will feed back a contention resolution message (ContentionResolution) to the user terminal after receiving Msg 3, which is called Message 4, abbreviated as Msg 4.

The LTE system uses a cyclic shift sequence of a Zadoff-Chu (ZC for short) sequence as a random access preamble. These ZC sequences are also called root sequences, and these cyclic shift sequences are also called zero correlation zone (ZCZ, Zero Correlation Zone) sequences. The base station notifies the user terminal of the logical index of the first ZC sequence that can be used by the PRACH of the cell and the step size of the cyclic shift (ie, the amount of cyclic shift) in the random access configuration parameters in the SIB-2. The user terminal obtains the physical index of the sequence from the logical index of the first root sequence according to a certain mapping rule, and then generates an available ZCZ sequence according to the cyclic shift amount and a certain "cyclic shift restriction rule". These cyclic shift restriction rules are enabled by the cyclic shift restriction flag. If the number of ZCZ sequences is less than the threshold value T (in the LTE system, T=64), the user terminal automatically increments the sequence logic index, and uses the next ZC sequence to continue to generate the ZCZ sequence until the total number of ZCZ sequences is equal to the above threshold value until. The generated T ZCZ sequences are numbered according to the sequence of generation, which is called the random access preamble sequence number, and the values of the sequence numbers are 0, 1, . . . , T-1. Finally, the user terminal selects one of all generated available ZCZ sequences according to a certain rule as a random access preamble sequence and sends it.

In the LTE-A system, system information on multiple downlink component carriers may inform the frequency and bandwidth information of the same uplink component carrier, that is, multiple downlink component carriers may correspond to the same uplink component carrier. During the random access process, when the base station detects the random access preamble sent on the uplink component carrier, the base station cannot determine which downlink component carrier the user terminal sending the signal is synchronized on. Therefore, the base station needs to send random access responses corresponding to the same preamble on all corresponding downlink component carriers. Similarly, when the base station detects the Msg 3 sent on the uplink component carrier, the base station cannot determine which downlink component carrier the user terminal sending the signal is synchronized on. Therefore, the base station needs to send the contention resolution message Msg 4 on all corresponding downlink component carriers. If the base station is still unable to determine the downlink component carrier to which the UE is synchronized after the random access procedure ends, subsequent downlink signals and/or downlink signaling may also need to be sent on multiple downlink component carriers. This will cause serious waste of system resources.

Therefore, in the LTE-A system, how the base station determines on which downlink component carrier to send the random access response and/or the contention resolution message Msg 4 becomes an urgent problem to be solved.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a downlink component carrier identification method and reporting method and device, so that the network side can determine the downlink component carrier to which the user terminal is synchronized, and send a random access message on the downlink component carrier. Response and contention resolution messages, or enable the user terminal to determine the downlink component carrier on which the network side sends the random access response, and receive the random access response on the downlink component carrier.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A method for identifying a downlink component carrier, comprising:

The system information of each downlink component carrier in a group of downlink component carriers corresponding to an uplink component carrier includes at least the frequency point information of the downlink component carrier carrying the random access response, or includes the downlink component carrier carrying the random access response The frequency point and its bandwidth information; or at least including the identification information of the downlink component carrier carrying the random access response, and the identification information of each downlink component carrier in the group of downlink component carriers and its frequency point information or the Identification information, frequency point and bandwidth information of each downlink component carrier in a group of downlink component carriers; and

Send the system information to the user terminal.

Preferably, in the system information of the downlink component carrier carrying the random access response, the frequency point information or the frequency point and its bandwidth information of the downlink component carrier carrying the random access response is a default value, or the random access response is carried The identification information of the downlink component carrier is the default value.

Preferably, the number of downlink component carriers carrying the random access response in the set of downlink component carriers is one.

Preferably, the method also includes:

The contention resolution message on the network side is carried on the downlink component carrier carrying the random access response.

Preferably, the system information of each downlink component carrier in the group of downlink component carriers further includes information for determining its own identity.

Preferably, the information for determining the identity of the self is the identification number of the downlink component carrier.

Preferably, the information for determining self-identity is:

The identification information and its frequency point information or its frequency point and bandwidth information of each downlink component carrier in the set of downlink component carriers, wherein its own identification information and its frequency point information or its frequency point and bandwidth information is the default value.

Preferably, the identification information of the downlink component carrier is an identification number of the downlink component carrier.

Preferably, the method also includes:

The user terminal reports the identification number of the downlink component carrier synchronized by itself, and the contention resolution message on the network side is carried on the downlink component carrier synchronized by the user terminal.

Preferably, the group of downlink component carriers corresponding to one uplink component carrier is: more than one downlink component carrier notified of frequency point information or frequency point and bandwidth information of the same uplink component carrier.

Preferably, the system information of each downlink component carrier in the group of downlink component carriers also includes the identification number and frequency point information of each downlink component carrier aggregated in the cell downlink, or includes the cell downlink The identification number and frequency point information of each downlink component carrier aggregated in the road, and the corresponding relationship between the uplink component carrier and the downlink component carrier.

Preferably, the system information is carried in a system information block (SIB) including cell radio resource configuration information, and the SIB is sent on a physical downlink shared channel.

A method for identifying a downlink component carrier, comprising:

The system information of each downlink component carrier in a group of downlink component carriers corresponding to an uplink component carrier includes at least information for determining its own identity; and

Send the system information to the user terminal.

Preferably, the information for determining the identity of the self is the identification number of the downlink component carrier.

Preferably, the information for determining self-identity is:

The identification information and frequency point information of each downlink component carrier in the group of downlink component carriers, wherein its own identification number and its frequency point information are default values.

Preferably, the method also includes:

The user terminal reports the identification number of the downlink component carrier synchronized by itself, and the contention resolution message on the network side is carried on the downlink component carrier synchronized by the user terminal.

Preferably, the group of downlink component carriers corresponding to one uplink component carrier is: more than one downlink component carrier notified of frequency point information or frequency point and bandwidth information of the same uplink component carrier.

Preferably, the system information is carried in a system information block (SIB) including cell radio resource configuration information, and the SIB is sent on a physical downlink shared channel.

Preferably, each downlink component carrier in the group of downlink component carriers bears a random access response corresponding to the same random access preamble.

A method for identifying a downlink component carrier, comprising:

Setting the correspondence between each downlink component carrier in a group of downlink component carriers corresponding to an uplink component carrier and the random access preamble sequence, the system information of each downlink component carrier in the group of downlink component carriers at least includes information for determining its own identity, information about the number of downlink component carriers in the set of downlink component carriers; and

Send the system information to the user terminal.

Preferably, the information for determining the identity of the self is the identification number of the downlink component carrier.

Preferably, the information for determining self-identity is:

The identification information and frequency point information of each downlink component carrier in the group of downlink component carriers, wherein the own identification information and its frequency point information are default values.

Preferably, the method also includes:

After being synchronized to the downlink component carrier, the user terminal obtains the identification number of the synchronized downlink component carrier, selects one of the random access preamble sequences corresponding to the downlink component carrier synchronized by the user terminal, and sends it.

Preferably, the corresponding relationship between each downlink component carrier in the group of downlink component carriers and the random access preamble sequence is specifically:

The sequence number of the random access preamble sequence is modulo-calculated with the number of downlink component carriers in the downlink component carrier group, and the random access preamble sequence corresponding to each modulus value corresponds to a downlink component carrier number in the downlink component carrier group Carrier correspondence.

Preferably, the group of downlink component carriers corresponding to one uplink component carrier is: more than one downlink component carrier notified of frequency point information or frequency point and bandwidth information of the same uplink component carrier.

Preferably, the system information is carried in a system information block (SIB) including cell radio resource configuration information, and the SIB is sent on a physical downlink shared channel.

A method for reporting synchronous downlink component carriers, comprising:

The user terminal synchronizes to the downlink component carrier and determines the identification number of the synchronized downlink component carrier, and selects the corresponding relationship between each downlink component carrier in the downlink component carrier group and the random access preamble sequence according to the preset downlink component carrier. One of the random access preamble sequences corresponding to the downlink component carrier is sent to the network side; wherein, the downlink component carrier group is all downlink component carriers corresponding to one uplink component carrier.

Preferably, the corresponding relationship between each downlink component carrier in the preset downlink component carrier group and the random access preamble sequence is specifically:

The sequence number of the random access preamble sequence is modulo-calculated with the number of downlink component carriers in the downlink component carrier group, and the random access preamble sequence corresponding to each modulus value corresponds to a downlink component carrier number in the downlink component carrier group Carrier correspondence.

A reporting device for synchronous downlink component carriers, comprising:

a synchronization unit, configured to synchronize to a downlink component carrier;

a determining unit, configured to determine the identification number of the downlink component carrier synchronized by the synchronization unit;

The storage unit is used to store the corresponding relationship between each downlink component carrier and the random access preamble in the preset downlink component carrier group; wherein, the downlink component carrier group is all downlink component carriers corresponding to one uplink component carrier;

A selection unit, configured to select one of the random access preambles corresponding to the synchronized downlink component carriers according to the correspondence between each downlink component carrier in the downlink component carrier group and the random access preamble stored in the storage unit; and

a sending unit, configured to send the random access preamble selected by the selecting unit to the network side.

Preferably, the corresponding relationship between each downlink component carrier in the preset downlink component carrier group and the random access preamble sequence is specifically:

The sequence number of the random access preamble sequence is modulo-calculated with the number of downlink component carriers in the downlink component carrier group, and the random access preamble sequence corresponding to each modulus value corresponds to a downlink component carrier number in the downlink component carrier group Carrier correspondence.

In the present invention, the system information of each downlink component carrier in a group of downlink component carriers corresponding to the same uplink component carrier includes at least the frequency point information of the downlink component carrier carrying the random access response, so that synchronization to the group of downlink component carriers The user terminal on the component carrier can receive the random access response Msg 2. In a group of downlink component carriers corresponding to the same uplink component carrier, there is only one downlink component carrier carrying the random access response, and it is not necessary to carry the random access response in every downlink component carrier in the entire downlink component carrier group. The system information of each downlink component carrier in the group of downlink component carriers may also include its own identification information, so that the user terminal synchronized to the downlink component carrier can determine the synchronized downlink component carrier through the system information. In this way, the user It is enough for the terminal to notify the network side of the downlink component carrier to which it is synchronized. After the network side determines the downlink component carrier to which the user terminal is synchronized, the downlink data of the user terminal can be carried by the synchronized downlink component carrier, and it is not necessary to carry the user terminal on each downlink component carrier in the group The downlink data saves wireless resources and improves the access capacity of the system. Alternatively, the system information of each downlink component carrier in a group of downlink component carriers corresponding to the same uplink component carrier only includes identification information identifying itself, and each downlink component carrier in a group of downlink component carriers carries a random access In this way, the user terminal reports its own synchronized downlink component carrier in Msg 3, and the network side uses the downlink component carrier synchronized by the user terminal to send Msg 4; or, uses each downlink component carrier in a group of downlink component carriers The corresponding relationship with the random access preamble sequence, in Msg 1, the downlink component carrier to which the user terminal is synchronized is notified on the network side through the sequence number of the random access preamble sequence. The invention is simple and practical to realize.

Description of drawings

FIG. 1 is a schematic diagram of the relationship between carrier aggregation and component carriers in an LTE-A system;

FIG. 2 is a flowchart of random access in an LTE system;

FIG. 3 is a flowchart of a method for reporting a synchronous downlink component carrier according to the present invention;

FIG. 4 is a schematic diagram of the composition and structure of a reporting device for synchronizing downlink component carriers according to the present invention.

Detailed ways

The basic idea of the present invention is: the system information of each downlink component carrier in a group of downlink component carriers corresponding to the same uplink component carrier includes at least the frequency point information of the downlink component carrier carrying the random access response, so that The user terminal synchronized to the downlink component carrier can receive the random access response Msg 2. In a group of downlink component carriers corresponding to the same uplink component carrier, there is only one downlink component carrier carrying the random access response, and it is not necessary to carry the random access response in every downlink component carrier in the entire downlink component carrier group. The system information of each downlink component carrier in the group of downlink component carriers may also include its own identification information, so that the user terminal synchronized to the downlink component carrier can determine the synchronized downlink component carrier through the system information. In this way, the user It is enough for the terminal to notify the network side of the downlink component carrier to which it is synchronized. After the network side determines the downlink component carrier to which the user terminal is synchronized, the downlink data of the user terminal can be carried by the synchronized downlink component carrier, and it is not necessary to carry the user terminal on each downlink component carrier in the group The downlink data saves wireless resources and improves the access capacity of the system.

Alternatively, the system information of each downlink component carrier in a group of downlink component carriers corresponding to the same uplink component carrier only includes identification information identifying itself, and each downlink component carrier in a group of downlink component carriers carries a random access In this way, the user terminal reports the downlink component carrier synchronized by itself in Msg 3, and the network side uses the downlink component carrier synchronized by the user terminal to send Msg 4;

Alternatively, using the corresponding relationship between each downlink component carrier in a group of downlink component carriers and the random access preamble, in Msg 1, the downlink component carrier to which the user terminal is synchronized is notified on the network side through the serial number of the random access preamble. The invention is simple and practical to realize.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings.

Firstly, how the present invention realizes the identification of the downlink component carrier is described.

As described in the background technology, when two or more downlink component carriers correspond to the same uplink component carrier, the network side will not be able to tell which downlink component carrier the user terminal is synchronizing with, so the transmission to the user terminal The downlink data of will be carried in all the downlink component carriers corresponding to the same uplink component carrier, which will cause serious waste of resources. In order to save resources, the present invention includes the frequency point information of the downlink component carrier carrying the random access response, or the frequency point and bandwidth in the system information of each downlink component carrier in the downlink component carrier group corresponding to the same uplink component carrier In this way, the user terminal can listen to the random access responses Msg2 and Msg4 on the downlink component carrier carrying the random access response. The system information of each downlink component carrier in the above-mentioned downlink component carrier group can also include the information to determine its own identity, so that which downlink component carrier the user terminal synchronizes to can determine the synchronized downlink component through the system information therein carrier. The information for determining the identity of the downlink component carrier includes the identification number of the downlink component carrier. Alternatively, the information for determining the identity of the downlink component carrier is: the identification information of each downlink component carrier in the group of downlink component carriers and its frequency point information or its frequency point and bandwidth information, wherein its own identification information and its frequency point Information or its frequency point and bandwidth information are the default values. The information for determining the identity of the downlink component carrier to which the user terminal is synchronized may be used in combination with the aforementioned frequency point information of the downlink component carrier carrying the random access response, or the frequency point and bandwidth information to jointly determine the identity of the downlink component carrier. Among them, in the system information of the downlink component carrier carrying the random access response: the identification information of the downlink component carrier carrying the random access response is the default value, or the frequency point information is the default value, or the frequency point and bandwidth information is Default value. After the user terminal determines the identity information of the synchronized downlink component carrier according to the system information of the synchronized downlink component carrier, it reports to the network side, and the network side determines the downlink component carrier synchronized by the user terminal, and uses the downlink component carrier to send the user terminal downlink data.

The present invention can also be realized through another solution: the system information of each downlink component carrier in a group of downlink component carriers corresponding to an uplink component carrier includes at least its own identification information; each of the group of downlink component carriers Each downlink component carrier carries a random access response. The identification information of the downlink component carrier is information that can identify itself, such as the identification number of the downlink component carrier, or, the system information includes the corresponding relationship between the frequency point of the downlink component carrier and the downlink component carrier. The frequency point information of the carrier can determine the synchronized downlink component carrier.

The present invention can also be realized through another solution: setting the corresponding relationship between each downlink component carrier in a group of downlink component carriers corresponding to an uplink component carrier and the random access preamble sequence, each of the group of downlink component carriers The system information of each downlink component carrier includes at least its own identification information and information about the number of downlink component carriers in the set of downlink component carriers. After being synchronized to the downlink component carrier, the user terminal obtains the identification information of the synchronized downlink component carrier, selects one of the random access preamble sequences corresponding to the downlink component carrier synchronized by the user terminal, and sends it. The network side can determine the downlink component carrier to which the user terminal is synchronized by using the random access preamble sent by the user terminal. Wherein, the corresponding relationship between each downlink component carrier in a group of downlink component carriers and the random access preamble is: the sequence number of the random access preamble and the number of downlink component carriers in the downlink component carrier group Modulus calculation, the random access preamble sequence corresponding to each modulus value corresponds to a downlink component carrier in the downlink component carrier group.

In the present invention, the system information is carried in the system information block containing the cell wireless resource configuration information, and the system information block is sent on the physical downlink shared channel.

The technical solution of the present invention will be described in detail below in conjunction with specific embodiments.

Embodiment one

Suppose an LTE-A system works in Frequency Division Duplex (FDD, Frequency Division Duplex) mode. There are two downlink component carriers in the system. The frequency point of downlink component carrier 1 is f1, the bandwidth is B1, and the downlink component carrier 2 is The frequency point is f2, and the bandwidth is B2; there is one uplink component carrier, and the frequency point of the uplink component carrier 1 is f3, and the bandwidth is B3. The downlink component carrier 1 and the downlink component carrier 2 correspond to the uplink component carrier 1, and the downlink component carrier 1 and the downlink component carrier 2 form a group.

The system information of downlink component carriers 1 and 2 carries the following information:

1) Frequency point f3 and bandwidth B3 of uplink component carrier 1;

2) Random access configuration parameters on the uplink component carrier 1;

3) The identification number of the downlink component carrier; wherein, the identification number of the downlink component carrier in the system information on the downlink component carrier 1 is 0, and the identification number of the downlink component carrier in the system information on the downlink component carrier 2 is 1.

The downlink of the user terminal is synchronized on the downlink component carrier 1. After receiving the random access preamble sent by the user terminal, the base station cannot determine whether the terminal sending the signal is synchronized on the downlink component carrier 1 or the downlink component carrier 2. Both carriers 1 and 2 send random access responses corresponding to the preamble.

After receiving the random access response, the user terminal sends the first scheduled uplink transmission Msg 3, and Msg 3 carries the downlink component carrier identification number 0 of the downlink component carrier 1 that it synchronizes with.

After receiving Msg 3, the base station can determine that the terminal is synchronized on downlink component carrier 1 according to the downlink component carrier identification number 0 in it, and send a contention resolution message Msg 4 on the downlink component carrier.

Here, the downlink component carrier identification number carried in the system information of the downlink component carriers 1 and 2 is only an exemplary description, and any information that can determine their own identities can replace item 3) of the system information. For example, the downlink component carrier can be identified by means of the identification numbers of all the downlink component carriers in the downlink component carrier group except its own identification number. Still for the above example, the number of downlink component carriers included in the downlink component carrier group is determined 1. When the downlink component carrier identification numbers are continuous and the initial value of the identification number is determined, the system information can carry all the downlink component carrier identification numbers in the downlink component carrier group except its own downlink component carrier identification number, and the user terminal passes the missing The identification number of the downlink component carrier can determine its own identity. Alternatively, by setting the corresponding relationship between the frequency point and bandwidth information of the downlink component carrier and the downlink component carrier identifier, the user terminal can determine its identification number through the synchronized frequency point and bandwidth information of the downlink component carrier.

Embodiment two

Suppose an LTE-A system works in FDD mode, and there are two downlink component carriers in the system, the frequency point of downlink component carrier 1 is f1, the bandwidth is B1, the frequency point of downlink component carrier 2 is f2, and the bandwidth is B2; There is one uplink component carrier, the frequency point of the uplink component carrier 1 is f3, and the bandwidth is B3. The downlink component carrier 1 and the downlink component carrier 2 correspond to the uplink component carrier 1, and the downlink component carrier 1 and the downlink component carrier 2 form a group.

The system information of downlink component carriers 1 and 2 carries the following information:

1) Frequency point f3 and bandwidth B3 of uplink component carrier 1;

2) Random access configuration parameters on the uplink component carrier 1;

3) The downlink component carrier identification number 0, frequency point f1, and bandwidth B1 of the downlink component carrier 1; the downlink component carrier identification number 1, frequency point f2, and bandwidth of the downlink component carrier 2 are B2; wherein, the downlink component carrier 1 of the downlink component carrier The carrier identification number, frequency point, bandwidth and other information are defaulted in the system information of downlink component carrier 1, and the downlink component carrier identification number, frequency point, bandwidth and other information of downlink component carrier 2 are defaulted in the system information of downlink component carrier 2 ;

4) The downlink component carrier identification number of the downlink component carrier currently sending the random access response by the base station. Select one of the downlink component carriers 1 and 2 to send a random access response. In this example, the downlink component carrier 2 sends the random access response, and the system information of the downlink component carriers 1 and 2 includes the identification number of the downlink component carrier 2, Wherein, in the system information of the downlink component carrier 2, the identification number of the downlink component carrier that sends the random access response is a default value.

The user terminal synchronizes downlink with the downlink component carrier 1, determines the downlink component carrier identification number 1 of the downlink component carrier 2 contained in the system information, and determines the downlink component carrier identification number 1 that the user terminal is synchronizing with according to the default downlink component carrier identification number in the system information. The ID of the downlink component carrier is 0, that is, the downlink component carrier is 1. Here, the number of downlink component carriers in the system is determined, which is 2, and the identification numbers of the downlink component carriers are numbered from 0, and the default identification numbers of the downlink component carriers in each downlink component carrier are the user terminal's current The identification number of the synchronized downlink component carrier. The default in the present invention can be set as an empty signal, or default or set identification information on the corresponding bearer resource.

The user terminal obtains the downlink component carrier identification number 1 of the downlink component carrier 2 currently sending the random access response by reading the system information, and combines the downlink component carrier identification number 1 of the downlink component carrier 2 carried in the system information, The frequency point is f2 and the bandwidth B2, and the frequency point f2 and the bandwidth B2 of the downlink component carrier 2 that sends the random access response are obtained, and then switched to the downlink component carrier 2 to wait for receiving the random access response.

The user terminal sends a random access preamble to the base station on the physical random access channel of the uplink component carrier 1 according to the random access configuration parameters in the system information.

After receiving the random access preamble sent by the user terminal, the base station configures the downlink component carrier 2 by high layer signaling to send a random access response corresponding to the preamble.

After receiving the random access response, the user terminal sends the first scheduled uplink transmission Msg 3, and Msg 3 carries the downlink component carrier identification number 0 of the downlink component carrier 1 that it synchronizes with. The user terminal switches back to the downlink component carrier 1 and waits to receive the contention resolution message Msg 4 .

After receiving Msg 3, the base station determines that the user terminal is synchronized on downlink component carrier 1 according to the downlink component carrier identification number 0, and sends a contention resolution message Msg 4 on the downlink component carrier.

The user terminal is downlink synchronized to the downlink component carrier 2, determines the downlink component carrier identification number 0 of the downlink component carrier 1 contained in the system information, and determines the downlink component carrier to be synchronized according to the default downlink component carrier identification number in the system information The downlink component carrier identification number 1 of carrier 2.

The downlink of the user terminal is synchronized to the downlink component carrier 2, and the downlink component carrier identification number of the downlink component carrier currently sending the random access response in the system information is determined to be default, and the base station is determined to send the random access response on the downlink component carrier synchronized by the user terminal . The user terminal does not switch the sensed downlink component carrier, and receives the random access response.

The user terminal sends a random access preamble to the base station on the physical random access channel of the uplink component carrier 1 according to the random access configuration parameters in the system information.

After receiving the random access preamble sent by the user terminal, the base station configures the downlink component carrier 2 by high layer signaling to send a random access response corresponding to the preamble.

After receiving the random access response, the user terminal sends the first scheduled uplink transmission Msg 3, and Msg 3 carries the downlink component carrier identification number 1 of the downlink component carrier 2 to which it is synchronized. And wait on the downlink component carrier 2 to receive the contention resolution message Msg 4 .

After receiving Msg 3, the base station determines that the user terminal is synchronized on downlink component carrier 2 according to the downlink component carrier identification number 1 therein, and sends a contention resolution message Msg 4 on the downlink component carrier.

In this example, the identity of each downlink component carrier in the downlink component carrier group and the frequency and bandwidth information of the downlink component carrier that sends the random access response may also be identified in other ways. Embodiments 3, 4, and 5 are other implementation solutions for identifying downlink component carriers.

Embodiment three

Suppose an LTE-A system works in FDD mode, and there are two downlink component carriers in the system, the frequency point of downlink component carrier 1 is f1, the bandwidth is B1, the frequency point of downlink component carrier 2 is f2, and the bandwidth is B2; There is one uplink component carrier, the frequency point of the uplink component carrier 1 is f3, and the bandwidth is B3. The downlink component carrier 1 and the downlink component carrier 2 correspond to the uplink component carrier 1, and the downlink component carrier 1 and the downlink component carrier 2 form a group.

The system information of downlink component carriers 1 and 2 carries the following information:

1) Frequency point f3 and bandwidth B3 of uplink component carrier 1;

2) Random access configuration parameters on the uplink component carrier 1;

3) The downlink component carrier identification number of downlink component carrier 1 is 0, frequency point, f1, bandwidth, B1; the downlink component carrier identification number of downlink component carrier 2 is 1, frequency point f2, bandwidth B2;

4) The downlink component carrier identification number of the downlink component carrier currently sending the random access response by the base station. Select one of the downlink component carriers 1 and 2 to send a random access response. In this example, the downlink component carrier 2 sends the random access response, and the system information of the downlink component carriers 1 and 2 includes the identification number of the downlink component carrier 2, Wherein, in the system information of the downlink component carrier 2, the identification number of the downlink component carrier that sends the random access response is a default value.

The user terminal is downlink-synchronized with downlink component carrier 1, determines the downlink component carrier identification number 1 of the downlink component carrier currently sending the random access response, combines the frequency point and bandwidth of each downlink component carrier broadcast in the system information block, and the corresponding The ID of the downlink component carrier, obtain the frequency point f2 and the bandwidth B2 of the downlink component carrier sending the random access response, and then switch to the downlink component carrier 2 to wait for receiving the random access response. Here, the number of downlink component carriers in the system is determined, which is 2, and the identification numbers of the downlink component carriers are numbered from 0. The default component carrier identification numbers in the system information of each downlink component carrier are the user The identification number of the downlink component carrier to which the terminal is currently synchronized.

The user terminal sends a random access preamble to the base station on the physical random access channel of the uplink component carrier 1 according to the random access configuration parameters in the system information.

After receiving the random access preamble sent by the user terminal, the base station configures the downlink component carrier 2 by high layer signaling to send a random access response corresponding to the preamble.

After receiving the random access response, the user terminal sends the first scheduled uplink transmission Msg 3, and waits to receive the contention resolution message Msg 4 on the downlink component carrier 2.

After receiving Msg 3, the base station sends a contention resolution message Msg 4 on the downlink component carrier 2.

The user terminal is downlink-synchronized on the downlink component carrier 2, reads the system information, determines that the downlink component carrier identification number of the downlink component carrier currently sending the random access response is default, and determines that the base station is on the downlink component carrier currently synchronized by the user terminal Send random access response. The user terminal does not need to switch, and waits to receive a random access response on the currently synchronized downlink component carrier (downlink component carrier 2).

The user terminal sends a random access preamble to the base station on the physical random access channel of the uplink component carrier 1 according to the random access configuration parameters in the system information.

After receiving the random access preamble sent by the user terminal, the base station configures the downlink component carrier 2 by high layer signaling to send a random access response corresponding to the preamble.

After receiving the random access response, the user terminal sends the first scheduled uplink transmission Msg 3, and waits to receive the contention resolution message Msg 4 on the downlink component carrier 2.

After receiving Msg 3, the base station sends a contention resolution message Msg 4 on the downlink component carrier.

Embodiment four

Suppose an LTE-A system works in FDD mode, there are 4 downlink component carriers in the system, the frequency point of downlink component carrier 1 is f1, the bandwidth is B1, the frequency point of downlink component carrier 2 is f2, and the bandwidth is B2, The frequency point of the downlink component carrier 3 is f3, the bandwidth is B3, the frequency point of the downlink component carrier 4 is f4, and the bandwidth is B4; there are 2 uplink component carriers, the frequency point of the uplink component carrier 1 is f5, the bandwidth is B5, and the uplink The frequency point of component carrier 2 is f6, and the bandwidth is B6. Downlink component carrier 1 and downlink component carrier 2 correspond to uplink component carrier 1, downlink component carrier 3 and downlink component carrier 4 correspond to uplink component carrier 2, downlink component carrier 1 and downlink component carrier 2 form a group, downlink component carrier 3, The 4 downlink component carriers form a group.

The system information of downlink component carriers 1 and 2 carries the following information:

1) Frequency point f5 and bandwidth B5 of uplink component carrier 1;

2) Random access configuration parameters on the uplink component carrier 1;

3) The downlink component carrier identification number of the downlink component carrier; the system information on the downlink component carrier 1 includes the downlink component carrier identification number 0, and the system information on the downlink component carrier 2 includes the downlink component carrier identification number 1.

4) The frequency point and bandwidth information of the downlink component carrier that the base station currently sends the random access response to. Select one of the groups where downlink component carriers 1 and 2 are located to send a random access response. In this example, downlink component carrier 2 sends a random access response, and the corresponding frequency point and bandwidth in the identification field on downlink component carrier 1 The information is f2 and B2, and the corresponding frequency point and bandwidth information in the identification field on the downlink component carrier 2 is default.

The system information of the downlink component carriers 3 and 4 carries the following information:

1) frequency point f6 and bandwidth B6 of the uplink component carrier 2;

2) random access configuration parameters on the uplink component carrier 2;

3) The downlink component carrier identification number of the downlink component carrier; the system information on the downlink component carrier 3 includes the downlink component carrier identification number 0, and the system information on the downlink component carrier 4 includes the downlink component carrier identification number 1.

4) The frequency point and bandwidth information of the downlink component carrier that the base station currently sends the random access response to. Select one of the groups where the downlink component carriers 3 and 4 are located to send a random access response. In this example, the random access response is sent on the downlink component carrier 4, and the corresponding frequency points and The bandwidth information is f4 and B4, and the corresponding frequency points and bandwidth information in the system information on the downlink component carrier 4 are default.

The downlink of the user terminal is synchronized with the downlink component carrier 1, the user terminal reads the system information of the downlink component carrier 1, obtains the frequency point f2 and the bandwidth B2 of the downlink component carrier 2 currently sending the random access response, and then switches to the downlink component carrier 2 Waiting to receive a random access response.

The user terminal sends a random access preamble to the base station on the physical random access channel of the uplink component carrier 1 according to the random access configuration parameters in the system information.

After receiving the random access preamble sent by the user terminal, the base station configures the downlink component carrier 2 by high layer signaling to send a random access response corresponding to the preamble.

After receiving the random access response, the user terminal sends the first scheduled uplink transmission Msg 3, and Msg 3 carries the downlink component carrier identification number 0 of the downlink component carrier 1 that it synchronizes with. The user terminal determines the currently synchronized downlink component carrier identification number by reading the downlink component carrier identification number information in the downlink component carrier system information, and the identification number is 0 in this example. The user terminal switches back to the downlink component carrier 1 and waits to receive the contention resolution message Msg 4 .

After receiving the Msg 3, the base station determines that the user terminal is synchronously on the downlink component carrier 1 according to the downlink component carrier identification number 0, the uplink component carrier 1 carrying the Msg 3, and the corresponding relationship between the uplink component carrier and the downlink component carrier. A contention resolution message Msg 4 is sent on the downlink component carrier. Here, the corresponding relationship between the uplink component carrier and the downlink component carrier can also be determined by setting an identifier such as a group number.

The downlink of the user terminal is synchronized with the downlink component carrier 4 , and the user terminal sends a random access preamble on the uplink component carrier 2 . The user terminal reads the system information of the downlink component carrier 4, finds that the frequency point and bandwidth information of the downlink component carrier currently sending the random access response is default, and determines that the base station sends the random access response on the downlink component carrier synchronized by the user terminal. The user terminal does not need to switch, and receives the random access response on the currently synchronized downlink component carrier.

The user terminal sends a random access preamble to the base station on the physical random access channel of the uplink component carrier 2 according to the random access configuration parameters in the system information.

After receiving the random access preamble sent by the user terminal, the base station configures the downlink component carrier 4 by high layer signaling to send a random access response corresponding to the preamble.

After receiving the random access response, the user terminal sends the first scheduled uplink transmission Msg 3, and Msg 3 carries the downlink component carrier identification number 1 of the downlink component carrier 4 to which it is synchronized. The user terminal waits to receive the contention resolution message Msg 4 on the downlink component carrier 4.

After receiving the Msg 3, the base station determines that the user terminal is synchronized on the downlink component carrier 4 according to the downlink component carrier identification number 1, the uplink component carrier 1 carrying the Msg 3, and the corresponding relationship between the uplink component carrier and the downlink component carrier, and A contention resolution message Msg 4 is sent on the downlink component carrier.

Embodiment five

Suppose an LTE-A system works in FDD mode, and there are two downlink component carriers in the system, the frequency point of downlink component carrier 1 is f1, the bandwidth is B1, the frequency point of downlink component carrier 2 is f2, and the bandwidth is B2; There is one uplink component carrier, the frequency point of the uplink component carrier 1 is f3, and the bandwidth is B3. The downlink component carrier 1 and the downlink component carrier 2 correspond to the uplink component carrier 1, and the downlink component carrier 1 and the downlink component carrier 2 form a group.

The system information of downlink component carriers 1 and 2 carries the following information:

1) Frequency point f3 and bandwidth B3 of uplink component carrier 1;

2) Random access configuration parameters on the uplink component carrier 1;

3) The frequency point and bandwidth information of the downlink component carrier that the base station currently sends the random access response to. Select one of the groups where the downlink component carriers 1 and 2 are located to send a random access response. In this example, the random access response is sent on the downlink component carrier 2, and the corresponding frequency point in the identification field on the downlink component carrier 1 and The bandwidth information is f2 and B2, and the corresponding frequency points and bandwidth information in the identification field on the downlink component carrier 2 are default.

The user terminal is downlink-synchronized with downlink component carrier 1. By reading the system information of downlink component carrier 1, the user terminal obtains the frequency point f2 and bandwidth B2 of downlink component carrier 2 currently sending the random access response, and then switches to downlink component carrier 2 and waits Receive a random access response.

The user terminal sends a random access preamble to the base station on the physical random access channel of the uplink component carrier 1 according to the random access configuration parameters in the system information.

After receiving the random access preamble sent by the user terminal, the base station configures the downlink component carrier 2 by high layer signaling to send a random access response corresponding to the preamble.

After receiving the random access response, the user terminal sends the first scheduled uplink transmission Msg 3, and waits to receive the contention resolution message Msg 4 on the downlink component carrier 2.

After receiving Msg 3, the base station sends a contention resolution message Msg 4 on the downlink component carrier 2.

The user terminal is downlink-synchronized on the downlink component carrier 2. By reading the system information, it is found that the frequency point and bandwidth information of the downlink component carrier currently sending the random access response is default, and it is determined that the base station is on the downlink component carrier synchronized by the user terminal. Send random access response. The user terminal does not need to switch, and waits to receive a random access response on the currently synchronized downlink component carrier.

The user terminal sends a random access preamble to the base station on the physical random access channel of the uplink component carrier 1 according to the random access configuration parameters in the system information.

After receiving the random access preamble sent by the user terminal, the base station configures the downlink component carrier 2 by high layer signaling to send a random access response corresponding to the preamble.

After receiving the random access response, the user terminal sends the first scheduled uplink transmission Msg 3, and waits to receive the contention resolution message Msg 4 on the downlink component carrier 2.

After receiving Msg 3, the base station sends a contention resolution message Msg 4 on the downlink component carrier.

Embodiment six

Suppose an LTE-A system works in FDD mode, there are 3 downlink component carriers in the system, the frequency point of downlink component carrier 1 is f1, the bandwidth is B1, the frequency point of downlink component carrier 2 is f2, and the bandwidth is B2, The frequency point of the downlink component carrier 3 is f3, and the bandwidth is B3; there is one uplink component carrier, and the frequency point of the uplink component carrier 1 is f4, and the bandwidth is B4. The downlink component carrier 1, the downlink component carrier 2, and the downlink component carrier 3 correspond to the uplink component carrier 1, and the downlink component carrier 1, the downlink component carrier 2, and the downlink component carrier 3 form a group.

The system information of downlink component carriers 1, 2, and 3 carries the following information:

1) Frequency point f4 and bandwidth B4 of uplink component carrier 1;

2) Random access configuration parameters on the uplink component carrier 1;

3) The downlink component carrier identification number of the downlink component carrier; the downlink component carrier identification number in the system information on downlink component carrier 1 is 0, the downlink component carrier identification number in the system information on downlink component carrier 2 is 1, and the downlink component carrier The identification number of the downlink component carrier in the system information on 3 is 2;

4) The number of downlink component carriers corresponding to the uplink component carrier 1 is 3;

The user terminal is downlink-synchronized on downlink component carrier 1, and obtains the downlink component carrier identification number of the downlink component carrier it is synchronizing with and the number 3 of downlink component carriers corresponding to uplink component carrier 1 by reading the system information.

The user terminal selects a random access preamble according to random access configuration parameters. The random access preamble that can be selected by the user terminal must meet the following conditions:

The sequence number mod 3 of the random access preamble = the identification number of the downlink component carrier mod 3 = 0; where, mod is a modulo symbol (the sequence numbers of the random access preamble are sorted from 0).

The user terminal sends the selected random access preamble to the base station on the physical random access channel of the uplink component carrier 1 .

After receiving the random access preamble sent by the user terminal, the base station determines that the user terminal is synchronously on the downlink component carrier 1 according to the sequence number of the random access preamble, and sends a random access response on the downlink component carrier.

After receiving the random access response, the user terminal sends the first scheduled uplink transmission Msg 3.

After receiving Msg 3, the base station sends a contention resolution message Msg 4 on downlink component carrier 1.

Fig. 3 is a flow chart of the reporting method of the synchronous downlink component carrier of the present invention, as shown in Fig. 3, the reporting method of the synchronous downlink component carrier of the present invention comprises the following steps:

Step 301: The user terminal synchronizes to the downlink component carrier and determines the identification information of the synchronized downlink component carrier, and selects the user terminal according to the corresponding relationship between each downlink component carrier in the downlink component carrier group and the random access preamble sequence set in advance. One of the random access preamble sequences corresponding to the downlink component carrier synchronized by the terminal; wherein, the downlink component carrier group is all downlink component carriers corresponding to one uplink component carrier.

Wherein, the identification information of the synchronized downlink component carrier determined by the user terminal is determined according to the methods described in the method for identifying the downlink component carrier in the foregoing embodiments 1 to 6, and details of its implementation will not be repeated here. The preset corresponding relationship between each downlink component carrier in the downlink component carrier group and the random access preamble sequence is specifically: the sequence number of the random access preamble sequence and the number of downlink component carriers in the downlink component carrier group are determined. Modulus calculation, the random access preamble sequence corresponding to each modulus value corresponds to a downlink component carrier in the downlink component carrier group. Regarding the corresponding relationship, reference may be made to the related description in the foregoing sixth embodiment, which will not be repeated here.

Step 302: Send the random access preamble sequence selected by the user terminal to the network side.

According to the corresponding relationship between the downlink component carrier and the random access preamble in step 301, select the random access preamble available to the user terminal for the user terminal, and send it to the base station through Msg 1.

4 is a schematic diagram of the composition and structure of the reporting device for synchronous downlink component carriers of the present invention. As shown in FIG. Unit 44, wherein the synchronization unit 40 is used to synchronize to the downlink component carrier; the determination unit 41 is used to determine the identification information of the downlink component carrier synchronized by the synchronization unit 40; the storage unit 42 is used to store the preset downlink component carrier group The corresponding relationship between each downlink component carrier and the random access preamble sequence; wherein, the downlink component carrier group is all downlink component carriers corresponding to one uplink component carrier; each downlink component carrier in the preset downlink component carrier group and The corresponding relationship of the random access preamble sequence is specifically: the sequence number of the random access preamble sequence and the number of downlink component carriers in the downlink component carrier group are subjected to modulo calculation, and the random access preamble sequence corresponding to each modulus value Corresponding to a downlink component carrier in the downlink component carrier group. The selection unit 43 is configured to select one of the random access preamble sequences corresponding to the synchronized downlink component carriers according to the corresponding relationship between each downlink component carrier in the downlink component carrier group and the random access preamble sequence stored in the storage unit 42; the sending unit 44 is configured to send the random access preamble sequence selected by the selection unit 43 to the network side.

The processing device shown in FIG. 4 is applicable to the user terminal side.

Those skilled in the art should understand that the implementation functions of each processing unit of the device for reporting a synchronous downlink component carrier shown in FIG. It can be realized by the program on the device, or by the corresponding logic circuit.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (30)

1. A method for identifying a downlink component carrier, comprising: The system information of each downlink component carrier in a group of downlink component carriers corresponding to an uplink component carrier includes at least the frequency point information of the downlink component carrier carrying the random access response, or includes the downlink component carrier carrying the random access response The frequency point and its bandwidth information; or at least including the identification information of the downlink component carrier carrying the random access response, and the identification information of each downlink component carrier in the group of downlink component carriers and its frequency point information or the Identification information, frequency point and bandwidth information of each downlink component carrier in a group of downlink component carriers; and Send the system information to the user terminal. 2. The method according to claim 1, wherein in the system information of the downlink component carrier carrying the random access response, the frequency point information or the frequency point and its bandwidth of the downlink component carrier carrying the random access response The information is a default value, or the identification information of the downlink component carrier bearing the random access response is a default value. 3. The method according to claim 1, wherein the number of downlink component carriers bearing the random access response in the set of downlink component carriers is one. 4. The method according to claim 3, further comprising: The contention resolution message on the network side is carried on the downlink component carrier carrying the random access response. 5. The method according to claim 3, wherein the system information of each downlink component carrier in the set of downlink component carriers further includes information for determining its own identity. 6. The method according to claim 5, wherein the information for determining the identity of the self is the identification number of the downlink component carrier. 7. The method according to claim 5, characterized in that the information for determining one's own identity is: The identification information and its frequency point information or its frequency point and bandwidth information of each downlink component carrier in the set of downlink component carriers, wherein its own identification information and its frequency point information or its frequency point and bandwidth information is the default value. 8. The method according to claim 7, wherein the identification information of the downlink component carrier is an identification number of the downlink component carrier. 9. The method according to any one of claims 6 to 8, further comprising: The user terminal reports the identification number of the downlink component carrier synchronized by itself, and the contention resolution message on the network side is carried on the downlink component carrier synchronized by the user terminal. 10. The method according to claim 9, wherein the group of downlink component carriers corresponding to one uplink component carrier is: one that notifies the frequency point information or the frequency point and bandwidth information of the same uplink component carrier The above downlink component carrier. 11. The method according to claim 10, wherein the system information of each downlink component carrier in the group of downlink component carriers further includes the identification of each downlink component carrier aggregated in the downlink of the cell number and its frequency point information, or include the identification number and its frequency point information of each downlink component carrier aggregated in the downlink of the cell, and the corresponding relationship between the uplink and downlink component carriers. 12. The method according to claim 11, wherein the system information is carried in a system information block (SIB) including cell radio resource configuration information, and the SIB is sent on a physical downlink shared channel. 13. A method for identifying a downlink component carrier, comprising: The system information of each downlink component carrier in a group of downlink component carriers corresponding to an uplink component carrier includes at least information for determining its own identity; and Send the system information to the user terminal. 14. The method according to claim 13, wherein the information for determining the identity of the self is the identification number of the downlink component carrier. 15. The method according to claim 13, characterized in that the information for determining one's own identity is: The identification information and frequency point information of each downlink component carrier in the group of downlink component carriers, wherein its own identification number and its frequency point information are default values. 16. The method according to claim 14 or 15, further comprising: The user terminal reports the identification number of the downlink component carrier synchronized by itself, and the contention resolution message on the network side is carried on the downlink component carrier synchronized by the user terminal. 17. The method according to claim 16, wherein the group of downlink component carriers corresponding to one uplink component carrier is: one that notifies the frequency point information or the frequency point and bandwidth information of the same uplink component carrier The above downlink component carrier. 18. The method according to claim 16, wherein the system information is carried in a system information block (SIB) including cell radio resource configuration information, and the SIB is sent on a physical downlink shared channel. 19. The method according to claim 16, wherein each downlink component carrier in the group of downlink component carriers bears a random access response corresponding to the same random access preamble. 20. A method for identifying a downlink component carrier, comprising: Setting the correspondence between each downlink component carrier in a group of downlink component carriers corresponding to an uplink component carrier and the random access preamble sequence, the system information of each downlink component carrier in the group of downlink component carriers at least includes information for determining its own identity, information about the number of downlink component carriers in the set of downlink component carriers; and Send the system information to the user terminal. 21. The method according to claim 20, wherein the information for determining the identity of the self is the identification number of the downlink component carrier. 22. The method according to claim 20, characterized in that the information for determining one's own identity is: The identification information and frequency point information of each downlink component carrier in the group of downlink component carriers, wherein the own identification information and its frequency point information are default values. 23. The method according to claim 21 or 22, further comprising: After being synchronized to the downlink component carrier, the user terminal obtains the identification number of the synchronized downlink component carrier, selects one of the random access preamble sequences corresponding to the downlink component carrier synchronized by the user terminal, and sends it. 24. The method according to claim 23, wherein the corresponding relationship between each downlink component carrier in the group of downlink component carriers and the random access preamble sequence is specifically: The sequence number of the random access preamble sequence is modulo-calculated with the number of downlink component carriers in the downlink component carrier group, and the random access preamble sequence corresponding to each modulus value corresponds to a downlink component carrier number in the downlink component carrier group Carrier correspondence. 25. The method according to claim 23, wherein the group of downlink component carriers corresponding to one uplink component carrier is: one that notifies the frequency point information or the frequency point and bandwidth information of the same uplink component carrier The above downlink component carrier. 26. The method according to claim 23, wherein the system information is carried in a system information block (SIB) including cell radio resource configuration information, and the SIB is sent on a physical downlink shared channel. 27. A method for reporting a synchronous downlink component carrier, comprising: The user terminal synchronizes to the downlink component carrier and determines the identification number of the synchronized downlink component carrier, and selects the corresponding relationship between each downlink component carrier in the downlink component carrier group and the random access preamble sequence according to the preset downlink component carrier. One of the random access preamble sequences corresponding to the downlink component carrier is sent to the network side; wherein, the downlink component carrier group is all downlink component carriers corresponding to one uplink component carrier. 28. The method according to claim 27, characterized in that, the corresponding relationship between each downlink component carrier in the downlink component carrier group set in advance and the random access preamble sequence is specifically: The sequence number of the random access preamble sequence is modulo-calculated with the number of downlink component carriers in the downlink component carrier group, and the random access preamble sequence corresponding to each modulus value corresponds to a downlink component carrier number in the downlink component carrier group Carrier correspondence. 29. A reporting device for synchronous downlink component carriers, comprising: a synchronization unit, configured to synchronize to a downlink component carrier; a determining unit, configured to determine the identification number of the downlink component carrier synchronized by the synchronization unit; The storage unit is used to store the corresponding relationship between each downlink component carrier and the random access preamble in the preset downlink component carrier group; wherein, the downlink component carrier group is all downlink component carriers corresponding to one uplink component carrier; A selection unit, configured to select one of the random access preambles corresponding to the synchronized downlink component carriers according to the correspondence between each downlink component carrier in the downlink component carrier group and the random access preamble stored in the storage unit; and a sending unit, configured to send the random access preamble selected by the selecting unit to the network side. 30. The device according to claim 29, wherein the corresponding relationship between each downlink component carrier in the preset downlink component carrier group and the random access preamble sequence is specifically: The sequence number of the random access preamble sequence is modulo-calculated with the number of downlink component carriers in the downlink component carrier group, and the random access preamble sequence corresponding to each modulus value corresponds to a downlink component carrier number in the downlink component carrier group Carrier correspondence.

Images