CN103220119B

CN103220119B - A kind of synchronous method and device of detected carrier

Info

Publication number: CN103220119B
Application number: CN201210018346.5A
Authority: CN
Inventors: 苟伟; 戴博; 左志松; 夏树强
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2012-01-19
Filing date: 2012-01-19
Publication date: 2017-11-28
Anticipated expiration: 2032-01-19
Also published as: CN103220119A

Abstract

The invention discloses a kind of synchronous method and device of detected carrier, including：User equipment determines the carrier information of first carrier according to the carrier information of the second carrier wave, and the channel condition information measurement pilot tone (CSI RS) of first carrier is calculated according to the carrier information of first carrier；User equipment receives CSI RS according to the carrier information of first carrier from first carrier, by the CSI RS received compared with the CSI RS being calculated, confirm whether first carrier and the second carrier wave synchronous and user equipment and first carrier whether synchronization.The invention provides a kind of scheme whether synchronous with backward compatibility carrier wave from UE sides checking new carrier wave, when ensure that base station uses new carrier wave for UE configurations, and it is operated in backward compatibility carrier wave, UE can interpolate that whether backward compatibility carrier wave is synchronous with new carrier wave, so as to which carrier wave of the direct base station for UE is dispatched.

Description

Method and device for detecting carrier synchronization

Technical Field

The present invention relates to the field of mobile wireless communications, and in particular, to a method and an apparatus for detecting carrier synchronization.

Background

As the mobile communication industry has developed and the demand for mobile data services has increased, the demand for mobile communication rate and quality of service has increased, and research and development work on the next-generation mobile communication system, which is typically the Long Term Evolution (LTE) project initiated by the third generation partnership project (3GPP), has been started before the third generation mobile communication (3G) is not yet commercialized in a large scale, and the LTE system can provide the highest spectrum bandwidth of 20MHz (megahertz). With the further evolution of the network, as an LTE evolution system, LTE-a (evolution LTE) can provide a spectrum bandwidth up to 100MHz, support more flexible and higher-quality communication, and meanwhile, the LTE-a system has good backward compatibility. In an LTE-a system, there are multiple Component Carriers (CCs), one LTE terminal can only operate on a certain CC that is backward compatible, and an LTE-a terminal with a strong capability can receive on multiple CCs at the same time. Namely, the terminal of the LTE-A can transmit and receive data in a plurality of component carriers at the same time, thereby achieving the purpose of improving the bandwidth. This technique is referred to as a multi-carrier aggregation technique.

In the LTE-a system, a multi-carrier aggregation technology is supported, and data is transmitted by multi-carrier aggregation in order to achieve a larger bandwidth. The base station subordinate to a maximum of five carriers, which are called component carriers, are carriers having backward compatibility. The carriers with backward compatibility are configured with necessary control channels and reference signals specified in the LTE R8/R9/R10 system, and execute a flow and a system broadcast message transmission mechanism specified in the LTE R8/R9/R10, a paging message transmission mechanism, and a cell handover/reselection mechanism specified in the LTE R8/R9/R10.

With the development of the technology, a novel carrier wave is proposed in LTE R11, the detailed characteristics of the carrier wave are still under discussion, it can be confirmed at present that the new carrier wave cannot be used independently, and needs to be paired with a backward compatible carrier wave for use. Cell Reference Signals (CRSs) in LTE R8/R9/R10 are not provided in an N-type carrier (a new carrier), which is mainly to reduce interference between carriers caused by the CRSs and to consider that the new carrier replaces the original CRSs with the new reference signals because CRS overhead is too large. Further, primary and secondary synchronization (PSS/SSS) in the new carrier is not mandatory, which is currently considered optional, whereas in LTE R8/R9/R10 is mandatory for the UE to synchronize with the carrier.

Currently, according to research progress of new carriers, new carriers and backward compatible carriers are considered to be divided into synchronous carriers and asynchronous carriers. For the requirement of the carrier aggregation technology in LTE R8/R9/R10, when two aggregated carriers are transmitted at the base station side, a certain time difference requirement needs to be met, and this time difference requirement can basically ensure that two carriers arrive at the UE substantially synchronously from the base station directly (there is no RRH node introduced before LTE R11, and an RRH node is introduced in LTE R11, so there is a case that the carriers arrive at the UE after being forwarded by the RRH), but the PSS/SSS needs to be configured in the two carriers simultaneously. The UE can respectively synchronize with the two carriers through the primary and secondary synchronization in the two carriers, so that the data can be respectively received from the carriers. For the new carrier technology, if the base station side only keeps synchronous transmission of the new carrier and the backward compatible carrier, once the PSS/SSS is not configured in the new carrier, synchronization of the new carrier and the backward compatible carrier may not be guaranteed on the UE side, for example, the new carrier and the backward compatible carrier do not experience the same node transmission, or the new carrier and the backward compatible carrier do not belong to the same band (bandwidth), and synchronization cannot be caused due to a large difference in carrier frequency.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a method and an apparatus for detecting carrier synchronization, which can detect whether a new carrier proposed in LTE is synchronized with a backward compatible carrier.

To solve the above technical problem, the present invention provides a method for detecting carrier synchronization, comprising:

the user equipment determines carrier information of a first carrier according to carrier information of a second carrier, and calculates a channel state information measurement pilot frequency (CSI-RS) of the first carrier according to the carrier information of the first carrier;

and the user equipment receives the CSI-RS from the first carrier according to the carrier information of the first carrier, compares the received CSI-RS with the calculated CSI-RS, and confirms whether the first carrier and the second carrier are synchronous and whether the user equipment and the first carrier are synchronous.

Further, the carrier information includes: a frame number, a subframe number, a slot number, and an index of an Orthogonal Frequency Division Multiplexing (OFDM) symbol.

Further, receiving CSI-RS from the first carrier according to the carrier information of the first carrier includes:

and the user equipment receives information from the first carrier, determines the position of the CSI-RS in the information according to the pre-received CSI-RS configuration information, and acquires the CSI-RS from the information according to the carrier information of the first carrier.

Further, calculating the CSI-RS of the first carrier according to the carrier information of the first carrier includes:

the user equipment calculates an initial value c of the CSI-RS of the first carrier according to the configuration information of the first carrier and the carrier information of the first carrier which are received in advance_initSaidWherein, said n_sIs a stand forThe carrier information of the first carrier contains a time slot number, the l is an OFDM index contained in the carrier information of the first carrier, and theThe cell identifier contained in the configuration information of the first carrier is the N_CPA Cyclic Prefix (CP) type included in configuration information for the first carrier.

Further, still include:

the user equipment uses an initial value c of the CSI-RS_initCalculating the channel state information measurement pilot frequency of the first carrier according to the time slot number of the first carrier and the index of the OFDM symbolThe above-mentioned Wherein c is a sequence for generating CSI-RS, and the initial value of c is c_init，A number of Resource Blocks (RBs) for the first carrier.

Further, comparing the received CSI-RS with the calculated CSI-RS, and determining whether the first carrier and the second carrier are synchronized and whether the ue and the first carrier are synchronized, includes:

and performing correlation operation on the received CSI-RS and the calculated CSI-RS, and if the correlation degree of the received CSI-RS and the calculated CSI-RS meets a set threshold, considering that the received CSI-RS is the same as the calculated CSI-RS, and confirming that the first carrier and the second carrier are synchronous and the user equipment is synchronous with the first carrier.

and if the received CSI-RS is the same as the calculated CSI-RS, confirming that the first carrier is synchronous with the second carrier and the user equipment is synchronous with the first carrier.

Further, still include:

the user equipment stores all data of the subframe where the received CSI-RS is located, when the received CSI-RS is different from the calculated CSI-RS, the time point of intercepting the CSI-RS is adjusted forwards or backwards by taking the received CSI-RS as a reference from the stored data of the subframe where the received CSI-RS is located, the CSI-RS is intercepted again, the intercepted CSI-RS is compared with the calculated CSI-RS, and when the intercepted CSI-RS is the same as the calculated CSI-RS, the time difference between the first carrier and the second carrier is confirmed according to the adjusted time point of intercepting the CSI-RS.

Further, still include:

when the time difference between the first carrier and the second carrier is smaller than a time threshold value, the user equipment confirms that the first carrier and the second carrier are synchronous and the user equipment and the first carrier are synchronous; and if the time difference between the first carrier and the second carrier exceeds the time threshold value, confirming that the first carrier and the second carrier are not synchronous and the user equipment and the first carrier are not synchronous.

Further, still include:

and after confirming whether the first carrier and the second carrier are synchronous or not, the user equipment feeds back a result of whether the first carrier and the second carrier are synchronous or not to the base station through an Acknowledgement (ACK), a non-acknowledgement (NACK) or a Radio Resource Management (RRM) measurement report.

Further, the first carrier is an N-type carrier in Long Term Evolution (LTE), the second carrier is a backward compatible carrier in LTE R8/R9/R10, and the first carrier and the second carrier are paired carriers.

Further, the determining, by the ue, the carrier information of the first carrier according to the carrier information of the second carrier includes:

the user equipment considers that the first carrier and the second carrier are synchronous in time, and defaults that the carrier information of the first carrier and the carrier information of the second carrier have the same value of a frame number, a subframe number, a time slot number and an index of an OFDM symbol.

Further, an apparatus for detecting carrier synchronization includes: a carrier information determination unit, a channel state information measurement pilot (CSI-RS) calculation unit, a CSI-RS reception unit, and a comparison unit, wherein:

the carrier information determining unit is used for determining the carrier information of the first carrier according to the carrier information of the second carrier;

the CSI-RS calculating unit is configured to calculate a CSI-RS of the first carrier according to the carrier information of the first carrier determined by the carrier information determining unit;

the CSI-RS receiving unit is used for receiving CSI-RS from the first carrier according to the carrier information of the first carrier;

the comparing unit is configured to compare the CSI-RS received by the CSI-RS receiving unit with the CSI-RS calculated by the CSI-RS calculating unit, and determine whether the first carrier and the second carrier are synchronized and whether the user equipment is synchronized with the first carrier.

Further, the CSI-RS receiving unit is specifically configured to receive information from the first carrier, determine a location of a CSI-RS in the information according to CSI-RS configuration information received in advance, and obtain the CSI-RS from the information according to carrier information of the first carrier.

Further, the CSI-RS calculating unit is specifically configured to calculate an initial value c of the CSI-RS of the first carrier according to the configuration information of the first carrier and the carrier information of the first carrier received in advance_initSaidWherein, said n_sIs the time slot number contained in the carrier information of the first carrier, the l is the index of the OFDM contained in the carrier information of the first carrier, theThe cell identifier contained in the configuration information of the first carrier is the N_CPA Cyclic Prefix (CP) type included in configuration information for the first carrier.

Further, the CSI-RS calculation unit is also used for using the initial value c of the CSI-RS_initCalculating the channel state information measurement pilot frequency of the first carrier according to the time slot number of the first carrier and the index of the OFDM symbolThe above-mentioned Wherein c is a sequence for generating CSI-RS, and the initial value of c is c_init，A number of Resource Blocks (RBs) for the first carrier.

Further, the comparing unit is specifically configured to confirm that the first carrier is synchronized with the second carrier and the ue is synchronized with the first carrier if the CSI-RS received by the CSI-RS receiving unit is the same as the CSI-RS calculated by the CSI-RS calculating unit.

Further, the CSI-RS receiving unit is further configured to store all data of the subframe where the received CSI-RS is located;

the comparison unit is further configured to adjust a time point of intercepting the CSI-RS forward or backward based on the received CSI-RS in data of a subframe where the received CSI-RS is located, which is stored in the CSI-RS receiving unit, when the received CSI-RS is different from the calculated CSI-RS, and re-intercept the CSI-RS, and compare the re-intercepted CSI-RS with the calculated CSI-RS, and when the re-intercepted CSI-RS is the same as the calculated CSI-RS, determine a time difference between the first carrier and the second carrier according to the adjusted time point of intercepting the CSI-RS.

Further, the comparing unit is further configured to confirm that the first carrier is synchronized with the second carrier when a time difference between the first carrier and the second carrier is smaller than a time threshold; and if the time difference between the first carrier and the second carrier exceeds the time threshold value, confirming that the first carrier and the second carrier are not synchronous.

In summary, the present invention provides a scheme for verifying whether a new carrier and a backward compatible carrier are synchronized from a UE side, so that when a base station configures and uses a new carrier for a UE and works in the backward compatible carrier, the UE can determine whether the backward compatible carrier and the new carrier are synchronized, thereby guiding the base station to schedule the carrier of the UE.

Drawings

FIG. 1 is a flow chart of a method of transmitting information in the present invention;

fig. 2 is a flowchart of a method of detecting carrier synchronization in the present invention;

fig. 3 is an architecture diagram of an apparatus for detecting carrier synchronization according to the present invention;

fig. 4 is an architecture diagram of an information transmission apparatus according to the present invention.

Detailed Description

In this embodiment, the base station performs information configuration for operation of the first carrier (new carrier in LTE), and transmits configuration information of the new carrier to the UE to support the UE to operate in the new carrier. Meanwhile, in a system with a new carrier, when the base station configures and uses the new carrier for the UE, the base station informs the UE through a second carrier (backward compatible carrier) paired with the new carrier, CSI-RS (channel state indication reference signal) configuration information in the new carrier, the UE receives the CSI-RS in the new carrier according to the CSI-RS configuration information and the carrier information of the new carrier, and calculates the CSI-RS according to the carrier information of the new carrier and the configuration information of the new carrier received in advance, if the received CSI-RS is the same as the calculated CSI-RS, the UE considers that the new carrier and the paired backward compatible carrier are synchronous carriers, and the user equipment is synchronous with the new carrier. The carrier information of the new carrier is that the UE assumes that the new carrier is synchronized with the paired backward compatible carrier, and determines the carrier information of the new carrier to be the same as the carrier information of the backward compatible carrier according to the carrier information of the backward compatible carrier, that is: and the new carrier and the paired backward compatible carrier are synchronous in time, and the carrier information of the new carrier and the carrier information of the paired backward compatible carrier have the same values of the frame number, the subframe number, the time slot number and the index of the OFDM symbol.

The embodiment also provides an information transmission method, which is used for sending the reference signal of the UE and the new carrier synchronization. The base station configures a reference signal for synchronization/synchronization tracking for the new carrier, and transmits configuration information of the reference signal to the UE through a Radio Resource Control (RRC) message of a backward compatible carrier. The configuration information of the reference signal includes: and transmitting resource information, period information, bandwidth information and the like of the reference signal. If the UE receives configuration information of a reference signal for synchronization/synchronization tracking, the reference signal is used for synchronization/synchronization tracking with the new carrier instead of obtaining synchronization/synchronization tracking with the new carrier through alignment of the new carrier with a paired backward compatible carrier in time/frequency.

The reference signal may be a CSI-RS, a Cell Reference Signal (CRS), or a demodulation reference signal (DM-RS). The following description will be made by taking CSI-RS as an example. And when the reference signal adopts the CSI-RS, the configuration information of the reference signal is the CSI-RS configuration information.

The UE is sent with the CSI-RS configuration information for synchronization/synchronization tracking of the new carrier through the RRC message, and the RRC message of the UE-specific type and the RRC message of the broadcast type can be distinguished.

For example, when the base station learns that the UE and the new carrier cannot perform synchronization/synchronization tracking, for example, when the UE and the new carrier are not strictly time-aligned on the UE side and the UE cannot perform synchronization/synchronization tracking with the new carrier through the backward compatible carrier, the base station may configure a reference signal for synchronization/synchronization tracking, such as CSI-RS, for the UE, and send configuration information of the reference signal to the UE through a UE-specific RRC message. The UE completes synchronization/synchronization tracking with the new carrier by utilizing the CSI-RS configured for the UE by the base station for synchronization/synchronization tracking.

As shown in fig. 1, another information transmission method provided in this embodiment includes:

step 101: a base station configures carrier waves in LTE;

step 102: and the base station sends the configuration information of the carrier to the UE, wherein the configuration information of the carrier comprises one or more of the bandwidth, the cell ID, the CP type, the CSI-RS configuration information and the downlink transmission mode of the carrier.

The configuration information of the carrier can be sent to the UE through a handover command, a measurement command, a UE-specific command, or a system broadcast message.

The following describes a transmission method of such information in detail.

The configuration information of the new carrier includes: the access frequency point and the bandwidth of the carrier can be transmitted in a System Information Block (SIB) as system information of a paired backward compatible carrier, considering that different SIBs contain different information contents and functions, the access frequency point and the bandwidth of a new carrier can be placed in SIB3 or SIB4 of the backward compatible carrier after comprehensive consideration, and the carried access frequency point and the bandwidth are required to be specially marked in SIB3 or SIB4 as the access frequency point and the bandwidth of the new carrier, so as to distinguish the existing carrier identification manner, if the access frequency channel and the bandwidth belonging to the new carrier are not identified, the UE can be accessed as a conventional carrier, but the UE cannot access the new carrier due to the fact that the new carrier does not have a PSS/SSS. The identifier belongs to the new carrier, so that the UE can accurately know that the frequency point and the bandwidth correspond to the new carrier, and the UE can process the new carrier. Or,

the base station sends the frequency point and the bandwidth to the UE preferably through a switching command or a measurement command, or through a UE-specific command or a system broadcast message.

The base station may send the frequency point and the bandwidth carried in a connection reconfiguration (RRCConnectionReconfiguration) message to the UE, or may configure the frequency point and the bandwidth of the new carrier in a measurement configuration (measConfig) message, and similarly, an indication needs to be additionally added in the message to indicate that the type of the carrier is the new carrier. Or,

considering that more messages need to configure the bandwidth and frequency point information of the new carrier, in order to facilitate the implementation of conveniently introducing the information into other information, an independent information unit structure may also be set for the configuration information of the new carrier, so that different messages directly refer to the information unit structure. The information element structure of the new carrier comprises: the carrier type information, frequency point and bandwidth, optionally, information of backward compatible carrier paired with the new carrier may also be added, and the carrier type information indicates that the information in the information unit structure is configured for that type of carrier, and may be used as an optional parameter. The information of the paired backward compatible carrier may implicitly be the carrier of the information unit structure for sending the new carrier, for example, if the information unit structure of the new carrier does not include the information of the paired backward compatible carrier, the carrier for sending the information unit structure is the paired backward compatible carrier by default, and if the information unit structure of the new carrier includes the information of the paired backward compatible carrier, it indicates that the new carrier is paired with the backward compatible carrier, so that the configuration information of the new carrier may be directly configured in other messages.

In this embodiment, a method for configuring a cell ID in a new carrier is also provided, and a cell ID that is the same as a paired backward compatible carrier is used as a default in the new carrier, so that a step of notifying a UE of the cell ID of the new carrier can be omitted, and a complex process of configuring an actual physical cell ID for the new carrier can also be omitted. For the UE, if it is scheduled to use a new carrier, the procedures of establishing RRC connection and registering access information in the core network may not be performed again. Or,

the new carrier uses the virtual cell ID, and the value of the virtual cell ID still needs the base station to notify the UE through the backward compatible carrier, the notification method may be different from the above notification method of the frequency point and the bandwidth of the new carrier or the same, and the virtual cell ID generally needs to be notified in a point-to-point manner, for example, the RRCConnectionReconfiguration message is used to notify the UE in a point-to-point manner. The procedure of registering the virtual cell ID on the core network side may also be omitted, so if the virtual cell ID is used for the new carrier, the above-mentioned information element structure of the new carrier needs to add the parameter of the virtual cell ID used by the new carrier. Alternatively, the new carrier uses the actual physical cell ID, the actual physical cell ID is reported in the same manner as the virtual cell ID, and the information element configuration of the new carrier is augmented with a parameter of the cell ID used by the new carrier.

When the new carrier uses the virtual cell ID, the new carrier can be well used in a Coordinated Multi-Point transmission (COMP) scenario, and when used in the scenario, the new carrier can be configured with a flexible virtual cell ID as needed by a base station, and by combining unique characteristics of no Physical Downlink Control Channel (PDCCH), CRS, and PSS/SSS in the new carrier, inter-cell interference under COMP is well Coordinated and avoided.

The virtual cell ID of the new carrier can be determined by the base station according to the physical ID of the backward compatible carrier participating in the cooperation, and since the virtual cell ID and the physical ID of the backward compatible carrier are both parameters used for generating other information in the carrier, under the condition that the parameters are the same, the generated other parameters are the same, such as CSI-RS, and the like, so that the CSI-RS in the two carriers are not orthogonal to each other, thereby generating interference. Therefore, the virtual cell ID may be determined so as to avoid interference caused when other information is calculated from the cell ID.

Preferably, the virtual cell ID in the new carrier is generated and configured for the required UE through UE-specific signaling, and unlike the existing physical cell ID, the latter is configured for all UEs in the cell, so the latter is subject to a large limitation, for example, only one physical cell ID can be configured for one carrier, and whether the distribution of the physical cell IDs between its neighboring cells is reasonable, for example, orthogonality needs to be considered. The configuration of the virtual cell ID in the new carrier is not constrained by the limitation condition of the original physical cell ID, for example, the base station may configure a virtual cell ID for each of two UEs in a new carrier, and notify the UEs through UE-specific signaling, so that the interference in the COMP scenario can be avoided to a great extent. Obviously, the new carrier simplifies the configuration, deletes the PDCCH, CRS and PSS/SSS, and fully embodies the new carrier performance in the COMP scenario by combining the use of the virtual cell ID in the present embodiment.

The base station may configure one same virtual cell ID for multiple UEs in the new carrier.

After the base station determines a virtual cell ID for a new carrier, the base station generates a scrambling code sequence according to the virtual cell ID, executes uplink reference signal UL-RS sequence grouping, and executes frequency Hopping hosting and other processing.

The present embodiment further provides a method for configuring and notifying a Cyclic Prefix (CP) type in a new carrier, and preferably, the base station uses the same CP type as a backward compatible carrier in the new carrier, that is, the backward compatible carrier uses a long CP or a short CP, and then the paired new carrier also uses the long CP or the short CP correspondingly, and the method is solidified. The CP type in the new carrier can be directly known by the UE when in a backward compatible carrier. In the prior art, the UE needs to determine the CP type of a certain carrier by retrieving the PSS/SSS in the carrier, mainly because the UE must first retrieve the PSS/SSS of the carrier to synchronize with the carrier when accessing the carrier, and in the prior art, the CP type is obtained while retrieving the PSS/SSS, otherwise, the synchronization process with the carrier cannot be completed. However, in the new carrier, since the PSS/SSS is not configured for the new carrier, the UE cannot acquire the CP type of the new carrier in the existing PSS/SSS retrieving manner, and in consideration of the fact that the UE that needs to operate in the new carrier inevitably operates in the backward compatible carrier paired with the new carrier, the UE first acquires the CP type of the backward compatible carrier, so if it is specified that the new carrier and the paired backward compatible carrier use the same CP, the UE can acquire the CP type of the new carrier before entering the new carrier to operate, and thus a signaling for notifying the CP can be omitted, and a complex process for the UE to retrieve the PSS/SSS is avoided. Or,

the CP type of the new carrier is arbitrarily configured, and then the base station informs the UE of the CP type in the new carrier through signaling at this time. Preferably, when the base station configures the UE to use the new carrier, the base station notifies the UE of the CP type used in the new carrier through an RRC message or a handover command or a measurement command or a system broadcast message in a backward compatible carrier. Specifically, the RRC reconfiguration (RRCConnectionReconfiguration) may be sent to the UE in a pairing notification message notifying pairing of the new carrier and the backward compatible carrier or in a measurement configuration (measConfig). If it is determined that the CP type used for the new carrier is configurable, then for the new carrier information element described above, the parameters of the CP type used for the new carrier need to be added.

This way, the CP type of the new carrier can be formulated according to the need of the new carrier, for example, when large coverage is needed, the base station can configure a long CP for the new carrier to achieve better effect, but the above-mentioned flexibility cannot be achieved by configuring the CP type of the new carrier to be the same as the backward compatible carrier. Or,

and if the base station does not send the command, the base station and the UE default that the new carrier uses the CP type which is the same as the paired backward compatible carrier. At this time, for the information element structure of the new carrier, some provisions need to be made for the CP type parameter, that is, when there is no CP type parameter in the information element structure, both the base station and the UE default that the new carrier uses the same CP as the paired backward compatible carrier, and if there is the CP type parameter, both the base station and the UE execute according to the CP type configured by the parameter.

The access frequency point, the bandwidth, the cell ID, the CP type and the CSI-RS configuration information of the new carrier can select proper message bearing according to different application scenes. For example, in the cell handover process, in order to reduce the number of interactions between the base station and the UE, the above information may be added to a handover command or a measurement command sent by the base station to the UE, so that the UE can measure the target carrier. The difference here from the prior art is that the cell ID, CP type and CSI-RS of the new carrier cannot be obtained after the UE directly accesses the target carrier, whereas in the cell handover or measurement process of the prior art, the physical cell ID, CP type and CRS configuration of the target cell are obtained by the UE itself after directly accessing the target cell.

In this embodiment, the transmission method adopted by the configuration information of the carrier is not limited, and the configuration information of the carrier may be transmitted in a handover command, a measurement command, a UE-specific command, and a system broadcast message, and may be carried in an RRC message, a measurement configuration message, or a pairing notification message, and an appropriate transmission method may be preferred for different scenarios.

The base station informs the UE of the CSI-RS configuration information of the new carrier through the backward compatible carrier, and the CSI-RS configuration information comprises the following steps: antenna port number (antennaportCount-r 10), CSI-RS resource configuration (resourceConfig-r10), CSI-RS subframe configuration (subframeConfig-r10), CSI-RS power control (p-C-r 10). The CSI-RS configuration information of the new carrier is contained in a measurement command which is sent by the base station to the UE and requires the UE to measure the new carrier, so that the UE obtains the CSI-RS configuration information of the carrier to be measured when the UE obtains the measurement command sent by the base station, and the measurement of the UE can be facilitated. Here, the complexity of CSI-RS configuration is mainly considered, and different from the measurement performed by using CRS in the prior art, the CRS configuration is relatively simple, so that no reference signal is given in the measurement command in the prior art, and since the measurement purpose is different and the specific RRC messages used are different, in this embodiment, for the cell that needs to use CSI-RS for measurement, the base station needs to add CSI-RS configuration information in the measurement command sent to the UE, so as to facilitate the measurement by the UE and reduce the interaction between the base station and the UE. Of course, handover commands and UE-specific commands may also be used for transmission.

The present embodiment also provides a method for detecting carrier synchronization, as shown in fig. 2, including:

step 201: the UE determines the carrier information of the new carrier under the condition that the new carrier is synchronous with the backward compatible carrier according to the carrier information of the backward compatible carrier matched with the new carrier;

in this embodiment, the time slot number n of the new carrier and the paired backward compatible carrier is defaulted_sAnd the OFDM symbol l in the slot is aligned, i.e. n of the new carrier_sAnd l and pairing backward compatible carrierCorresponding n of wave_sAnd l are strictly time aligned.

Step 202: the method comprises the steps that UE receives configuration information of a carrier wave sent by a base station;

step 203: the UE calculates the CSI-RS of the new carrier according to the carrier information of the new carrier;

the UE calculates an initial value c of the CSI-RS of the new carrier according to the configuration information of the new carrier and the carrier information of the new carrier_init；

Initial value c of CSI-RS_initThe calculation formula of (2):

wherein n is_sIs the slot number contained in the carrier information of the new carrier, l is the index of the OFDM contained in the carrier information of the new carrier,for cell identity, N, contained in the configuration information of the new carrier_CPIs the CP type contained in the configuration information of the new carrier.

UE reuses initial value c of CSI-RS_initCalculating the channel state information measurement pilot frequency of the new carrier according to the time slot number of the new carrier and the index of the OFDM symbol Wherein c is a sequence for generating CSI-RS, and the initial value of c is c_init，Is a stand forA number of Resource Blocks (RBs) of the first carrier.

Step 204: the UE receives the CSI-RS in the new carrier according to the frequency point and bandwidth information of the new carrier sent to the compatible carrier by the base station and the carrier information of the determined new carrier;

the user equipment receives information from the first carrier, determines the position of the CSI-RS in the information according to the pre-received CSI-RS configuration information, and intercepts the CSI-RS from the information according to the carrier information of the new carrier.

Step 205: the UE detects whether the received CSI-RS is the same as the sequence calculated by the method, if so, the carrier information of the determined new carrier is considered to be correct in the new carrier, that is, the new carrier and the paired backward compatible carrier are strictly synchronized, that is, the frame number, the subframe number and the OFDM symbol are strictly time-aligned, and the UE is synchronized with the first carrier, so that the UE can keep and maintain the synchronization of the UE and the new carrier by means of the frame number, the subframe number and the OFDM symbol in the backward compatible carrier.

In practice, correlation operation is performed on the two obtained CSI-RSs, whether the two obtained CSI-RSs are the same or not is judged according to a correlation peak value, and if the correlation degree between the received CSI-RS and the calculated CSI-RS meets a set threshold, the received CSI-RS is considered to be the same as the calculated CSI-RS.

The UE may send the conclusion information to the base station, and after knowing the conclusion, the base station may configure the UE to use the new carrier. Of course, the UE may also send the conclusion to the base station as a reason for the failure of the RRM measurement. Of course, the UE may not feed back the result to the base station, and the UE may only feed back the measurement result to the base station.

In addition, the present embodiment also provides a downlink transmission mode of the UE in the new carrier, so that the UE knows how to let the UE work in the new carrier when the UE knows that the UE is synchronized with the new carrier and the backward compatible carrier.

Considering that there are multiple transmission modes in LTE, the present embodiment proposes that the transmission mode of the new carrier adopts the following manner with respect to the characteristics of the new carrier:

the downlink transmission mode includes a downlink transmission mode 9, and a Format of DCI (downlink control Information) in the downlink transmission mode 9 is DCI Format1A, a transmission mode of data corresponding to the downlink control Information on a PDSCH (physical downlink shared channel) is a single antenna port transmission mode, or the Format of DCI in the downlink transmission mode 9 is DCI Format1A, and a transmission mode of corresponding data on the PDSCH is a diversity mode based on a user-specific reference signal.

The downlink transmission mode further comprises at least one of:

the PDSCH uses only the downlink transmission mode transmitted by the single antenna port 7;

PDSCH is a downlink transmission mode based on a user-specific reference signal diversity mode;

the downlink control information formats corresponding to the two downlink transmission modes are DCI Format1 or DCIFormat 1A; or, the downlink control information formats corresponding to the two downlink transmission modes are new DCI Format or DCIFormat 1A; or, the downlink control information formats corresponding to the two downlink transmission modes are new DCI Fonnat.

That is, if the UE is configured by the higher layer to perform Physical Downlink Control Channel (PDCCH) decoding using Cyclic Redundancy Check (CRC) scrambled by a Cell radio network temporary Identifier (C-RNTI), the PDCCH and all related PDSCHs should be decoded according to the corresponding combinations defined in tables 1 to 6, wherein the PDCCH further includes an enhanced PDCCH;

the downlink transmission mode x in the following tables 3 to 6 may also include only one corresponding DCIFormat in the following tables;

the following DCI Format Z is DCI Format1A or new DCI Format;

the following DCI Format Y is DCI Format1 or new DCI Format;

TABLE 1

TABLE 2

TABLE 3

TABLE 4

TABLE 5

TABLE 6

Example 1:

in a certain system, there are two carriers, one is assumed to be a carrier with backward compatibility property, and the other is the new carrier, and in this embodiment, it is assumed that no independent PSS/SSS is configured in the new carrier.

First, the base station pairs the backward compatible carrier with the new carrier, and sends the pairing information to the UE in the backward compatible carrier. Since the new carrier does not support the direct access of the UE, all the UE are accessed to the system from the backward compatible carrier, and then the base station carries out the configuration scheduling of the carrier to the UE. For example, configuring some UEs to use a new carrier.

Specifically, the base station sends the information of pairing the backward compatible carrier and the new carrier to the UE, so that the UE knows which new carrier the backward compatible carrier is in the pairing use relationship with. And the base station sends some common channels and important system information in the new carrier to the UE through the paired backward compatible carrier, so that the UE can know the relevant configuration in the new carrier. In the embodiment, the new carrier and the backward compatible carrier are configured to use the same cell ID, and the new carrier uses the same CP type as the backward compatible carrier, but the new carrier uses the short CP in consideration of the application situation of the CSI-RS. This can eliminate the need for the base station to inform the UE of the cell ID and CP type information used by the new carrier. For example, in this embodiment, the base station at least needs to send CSI-RS configuration information in the new carrier to the UE, where the configuration information is: antenna port number (antennaportCount-r 10), CSI-RS resource configuration (resourceConfig-r10), CSI-RS subframe configuration (subframeConfig-r10), CSI-RS power control (p-C-r 10).

When the base station side uses a new carrier, the new carrier needs to be performed according to the requirement of carrier aggregation transmission specified by the existing protocol, for example, the base station needs to ensure that the time difference of the transmission of the two aggregated carriers on the base station side does not exceed the maximum value specified by the protocol (specifically, refer to LTE TS36.104), so that the two carriers are strictly synchronized when the base station side transmits. The two carriers are then transmitted over the air interface, due to the frequency characteristics of the carriers, the mobility characteristics of the UE and the experienced transmission node, it may result in that the strict synchronization between the two carriers is broken when they arrive at the UE, but since it is unclear to the base station whether the strict synchronization is still maintained when the backward compatible carrier and the new carrier arrive at the UE side, therefore, according to the present embodiment, further, if the base station needs to transmit data using a new carrier for the UE, firstly, the base station requires the UE to perform measurement on the new carrier (here, the measurement mainly refers to RRM measurement, and the base station determines whether the new carrier is suitable for activation for the UE according to the measurement result), then since the UE does not know whether the UE keeps strict synchronization with the new carrier, because there is no PSS/SSS configuration in the new carrier, so after the UE receives the new carrier measurement requested by the base station, the UE processes in the following manner:

after the UE receives a command that the base station requires to execute measurement of a new carrier, the UE side defaults that the new carrier and the backward compatible carrier are strictly synchronous, the new carrier and the backward compatible carrier are considered to be strictly aligned in the time direction, and because the UE can acquire the frame number, the time slot number, the subframe number and the index of an OFDM symbol of the backward compatible carrier, the UE defaults that the frame number, the time slot number, the subframe number and the index of the OFDM symbol corresponding to the new carrier are completely consistent with the backward compatible carrier. Therefore, the UE determines the frame number, the time slot number, the subframe number and the index value of the OFDM symbol of the new carrier through the backward compatible carrier to receive the CSI-RS in the new carrier, and then detects whether the received CSI-RS data is the same as the CSI-RS calculated through the specific CSI-RS configuration information:

if the carrier number, the time slot number, the subframe number and the index of the OFDM symbol of the new carrier are determined, the UE can obtain the frame number, the time slot number, the subframe number and the index of the OFDM symbol in the corresponding new carrier by determining the frame number, the time slot number, the subframe number and the index of the OFDM symbol in the backward compatible carrier, and therefore the UE can provide a foundation for the UE to work in the new carrier. The UE feeds back a conclusion that the new carrier and the backward compatible carrier which are detected at the UE side are strictly synchronous to the base station, and the base station can decide whether to use the new carrier for the UE configuration or not after obtaining the conclusion. In this way, the base station configures the UE to use the new carrier.

If the carrier waves are different from the carrier waves, the UE obtains a conclusion that the two carrier waves are not strictly synchronous when the new carrier wave and the backward compatible carrier wave reach the UE side, the UE feeds the conclusion back to the base station, and the base station can determine whether to use the new carrier wave for the UE configuration or not according to the conclusion. In this way, the base station will not configure the UE to use the new carrier.

The UE determines whether the new carrier and the paired backward compatible carrier are synchronized, and the UE may implicitly feed back through ACK/NACK, or may carry a feedback to the base station through a message of an RRM measurement report.

Example 2:

the embodiment is basically the same as embodiment 1, except that if the UE determines that the new carrier and the backward compatible carrier are not synchronous through the CSI-RS of the new carrier, the UE further needs to perform further calculation according to the CSI-RS to determine a specific time difference value between the new carrier and the backward compatible carrier.

Specifically, the base station sends the information of pairing the backward compatible carrier and the new carrier to the UE, so that the UE knows which new carrier the backward compatible carrier is in the pairing use relationship with. And the base station sends some common channels and important system information in the new carrier to the UE through pairing backward compatibility, so that the UE knows the relevant configuration in the new carrier. For example, in the present invention, the base station at least needs to send CSI-RS configuration information in the new carrier to the UE, where the configuration information is: antenna port number (antennaportCount-r 10), CSI-RS resource configuration (resourceConfig-r10), CSI-RS subframe configuration (subframeConfig-r10), CSI-RS power control (p-C-r10), cell ID used in the new carrier, and CP type used in the new carrier. For the CP type of the new carrier, the CP type given for the new carrier in this embodiment should be consistent with the CP type of the backward compatible carrier. This facilitates tight time alignment between the new carrier and the paired backward compatible carrier.

When the base station side uses a new carrier, the new carrier needs to be performed according to the requirement of carrier aggregation transmission specified by the existing protocol, for example, the base station needs to ensure that the time difference of the transmission of the two aggregated carriers on the base station side does not exceed the maximum value specified by the protocol (specifically, refer to LTE TS36.104), so that the two carriers are strictly synchronized when the base station side transmits. The two carriers are then transmitted over the air interface, due to the frequency characteristics of the carriers, the mobility characteristics of the UE and the experienced transmission node, it may result in that the strict synchronization between the two carriers is broken when they arrive at the UE, but since it is unclear to the base station whether the strict synchronization is still maintained when the backward compatible carrier and the new carrier arrive at the UE side, therefore, according to the present embodiment, further, if the base station needs to transmit data using a new carrier for the UE, first, the base station requires the UE to perform measurement on the new carrier (here, the RRM measurement is mainly used, and the base station determines whether the new carrier is suitable for activation for the UE according to the measurement result), because the UE does not know whether the UE keeps strict synchronization with the new carrier, because there is no PSS/SSS configuration in the new carrier, so after the UE receives the new carrier measurement requested by the base station, the UE processes in the following manner:

after the UE receives a command that the base station requires to execute measurement of a new carrier, the UE side defaults that the new carrier and the backward compatible carrier are strictly synchronous, the new carrier and the backward compatible carrier are considered to be strictly aligned in the time direction, and because the UE learns the frame number, the time slot number, the subframe number and the index of an OFDM symbol of the backward compatible carrier, the UE defaults that the frame number, the time slot number, the subframe number and the index of the OFDM symbol corresponding to the new carrier are completely consistent with the backward compatible carrier. Therefore, the UE determines the frame number, the slot number, the subframe number and the index of the OFDM symbol of the new carrier through the backward compatible carrier, receives the CSI-RS in the new carrier, and then detects whether the received CSI-RS is the same as the CSI-RS calculated through the specific CSI-RS configuration information:

if the carrier numbers are the same, the conclusion that the new carrier and the backward compatible carrier are strictly aligned in time is considered to be true on the assumption that the UE side assumes that the new carrier and the backward compatible carrier are strictly synchronized, namely, the indexes of the frame, the time slot, the subframe and the OFDM symbol of the new carrier are aligned with the backward compatible carrier, and the UE can obtain the frame number, the time slot number, the subframe number and the index of the OFDM symbol in the corresponding new carrier by determining the frame number, the time slot number, the subframe number and the index of the OFDM symbol in the backward compatible carrier, so that the UE provides a basis for the UE to work in the new carrier. The UE feeds back a conclusion that the new carrier and the backward compatible carrier which are detected at the UE side are strictly synchronous to the base station, and the base station can decide whether to use the new carrier for the UE configuration or not after obtaining the conclusion. In this way, the base station configures the UE to use the new carrier.

If different, the UE side can further determine the time difference actually existing between the new carrier and the backward compatible carrier through the CSI-RS. Specifically, the UE should store the received data of the new carrier before detecting the CSI-RS in the received new carrier, and when the UE obtains that the new carrier is not synchronized with the backward compatible carrier, the UE continues to adjust the time point for intercepting the CSI-RS forward or backward based on the received CSI-RS from the stored data, and then intercepts the CSI-RS again, (at this time, the CSI-RS is verified step by step according to the sampling points in the time direction), and compares the intercepted CSI-RS with the CSI-RS calculated by using the known parameters for verification, so as to obtain the actual time difference between the new carrier and the backward compatible carrier. When the time difference is relatively small (for example, the time difference does not affect the ACK/NACK feedback interval, and for example, does not exceed one 1ms or 0.5 ms, such a value does not affect the feedback interval), the UE can consider that the new carrier and the backward compatible carrier on the UE side are synchronized. If the time difference is large, the UE can consider that the new carrier and the backward compatible carrier on the UE side are not synchronized.

The UE side may consider that the new carrier and the paired backward compatible carrier are synchronized, so that when the base station uses the new carrier for the UE, the UE may adjust and receive data of the new carrier according to the time difference.

Example 3:

this embodiment is different from embodiments 1 and 2, and embodiment 3 focuses on the configuration and transmission process of necessary information of a new carrier, so that the UE can obtain the information in a timely manner.

In a certain system, there are 2 carriers, one is assumed to be a carrier with backward compatibility property, and the other is the new carrier, and in this embodiment, it is assumed that no independent PSS/SSS is configured in the new carrier.

For a UE accessing a backward compatible carrier, it is possible for the base station to use a new carrier for its configuration. According to the invention, if the base station plans to configure and use the backward compatible carrier for a certain UE, the base station needs to send necessary information of a new carrier for the UE, and at the moment, the base station contains an information unit structure of the new carrier in an RRCConnectionReconfiguration message and gives a value to a parameter in the structure. One value configuration for this structure is given below.

New carrier information element structure: {

Frequency point

Bandwidth of

Cell ID

CP type

}

After the base station and the UE transmit and receive the structure, the name of the "information element structure" body is understood to indicate that the structure is of a new carrier type. And the carrier wave transmitting the structure can be regarded as having a pairing relationship with the carrier wave described within the structure. The frequency point, bandwidth, cell ID and CP type are all describing the new carrier in the structure. The cell ID may be further divided into an actual physical cell ID or a virtual cell ID. The virtual cell ID is used only to determine some parameters of the new carrier that need to be calculated using the cell ID, here the virtual cell ID value. The UE does not need to establish an independent RRC connection on the carrier corresponding to the virtual cell ID.

For the situation that one backward compatible carrier is paired with a plurality of new carriers, the structure body needs to contain information of the plurality of new carriers, and the information of each new carrier can be contained in the same structure body according to the signaling corresponding to the structure body composition given above. Assuming that the new carrier uses the same cell ID as the paired backward compatible carrier, the structure is as follows for one backward compatible carrier paired with 2 new carriers:

new carrier information element structure: {

Frequency point

Bandwidth of

CP type

Frequency point

Bandwidth of

CP type

……

}

Example 4:

embodiment 4 mainly describes that a base station configures a reference signal for synchronization/synchronization tracking for a UE, and the reference signal here mainly refers to CSI-RS. This primary and CSI-RS may be in a single set of independent configuration relationships.

The method can be used in combination with embodiments 1 and 2, on the basis of embodiments 1 and 2, when the UE confirms that the backward compatible carrier cannot be synchronized/synchronously tracked with the new carrier through pairing, and after the base station knows the above situation, the base station can configure the CSI-RS for synchronization/synchronization tracking in the new carrier for the UE through the UE-specific RRC message, send the CSI-RS configuration information as the configuration information of the reference signal to the UE, and then the UE completes synchronization/synchronization tracking with the new carrier by using the CSI-RS, so as to ensure the operation of the UE in the new carrier.

Or, the base station configures a specific CSI-RS pattern in the new carrier for synchronization tracking of the UE and the new carrier. In this case, after the UE accesses the new carrier, it finds that the CSI-RS configured by the base station for synchronization tracking exists, and then the UE uses the CSI-RS for synchronization tracking, otherwise, the UE uses the reference signal in the backward compatible carrier paired with the new carrier for synchronization tracking of the new carrier.

The base station transmitting the specific CSI-RS configuration information can be transmitted to the UE through system information (e.g., SIB) or a dedicated RRC message.

The base station directly determines whether to configure the CSI-RS for synchronization/synchronization tracking for the UE according to the measurement result by letting the UE perform measurement on the new carrier, and when the UE receives the configuration information of the reference signal for synchronization/synchronization tracking of the new carrier configured for the UE by the base station through a dedicated RRC message, the UE performs synchronization/synchronization tracking with the new carrier by using the configured CSI-RS. If the UE does not receive the CSI-RS configuration information for synchronization/synchronization tracking through the dedicated RRC message, the UE determines synchronization/synchronization tracking of the new carrier in a manner that the new carrier is strictly aligned with the pairing backward compatible carrier in time.

The UE can judge the synchronization situation between the new carrier and the paired backward compatible carrier by whether the base station configures a reference signal for synchronization/synchronization tracking of the new carrier for the UE, for example, when the UE receives CSI-RS configuration information for synchronization/synchronization tracking in the new carrier sent by the base station for the UE, the UE considers that the new carrier and the paired backward compatible carrier are not strictly synchronized for the UE, the UE needs to use the configured CSI-RS to complete synchronization/synchronization tracking with the new carrier, otherwise, the UE considers that the new carrier and the paired backward compatible carrier are strictly synchronized for the UE.

The new carrier described herein is configured without PSS/SSS and without CRS. And if the PSS/SSS of the UE is configured in the new carrier, the UE directly uses the PSS/SSS in the new carrier to synchronize with the new carrier.

As shown in fig. 3, the present embodiment further provides an apparatus for detecting carrier synchronization, including: the device comprises a carrier information determining unit, a CSI-RS calculating unit, a CSI-RS receiving unit and a comparing unit, wherein:

a carrier information determining unit, configured to determine carrier information of a first carrier according to carrier information of a second carrier;

the CSI-RS calculation unit is used for calculating the CSI-RS of the first carrier according to the carrier information of the first carrier determined by the carrier information determination unit;

a CSI-RS receiving unit, configured to receive a CSI-RS from a first carrier according to carrier information of the first carrier;

and the comparison unit is used for comparing the CSI-RS received by the CSI-RS receiving unit with the CSI-RS calculated by the CSI-RS calculation unit, and determining whether the first carrier and the second carrier are synchronous and whether the user equipment and the first carrier are synchronous.

And if the CSI-RS received by the CSI-RS receiving unit by the comparison unit is the same as the CSI-RS calculated by the CSI-RS calculation unit, the first carrier and the second carrier are confirmed to be synchronous, and the user equipment is synchronous with the first carrier.

The carrier information includes: a frame number, a subframe number, a slot number, and an index of an Orthogonal Frequency Division Multiplexing (OFDM) symbol.

The CSI-RS receiving unit is specifically configured to receive information from the first carrier, determine a position of the CSI-RS in the information according to the CSI-RS configuration information received in advance, and acquire the CSI-RS from the information according to the carrier information of the first carrier.

A CSI-RS calculation unit, specifically configured to calculate an initial value c of the CSI-RS of the first carrier according to the configuration information of the first carrier and the carrier information of the first carrier received in advance_init，Wherein n is_sIs the slot number contained in the carrier information of the first carrier, l is the index of the OFDM contained in the carrier information of the first carrier,is a cell identifier, N, contained in the configuration information of the first carrier_CPIs the CP type contained in the configuration information of the first carrier.

A CSI-RS calculation unit for using the initial value c of the CSI-RS_initCalculating the channel state information measurement pilot frequency of the first carrier according to the time slot number of the first carrier and the index of the OFDM symbol Wherein c is a sequence for generating CSI-RS, and the initial value of c is c_init，Number of Resource Blocks (RBs) for a first carrier。

The CSI-RS receiving unit is also used for storing all the received data of the subframe where the CSI-RS is positioned;

and the comparison unit is also used for adjusting the time point of intercepting the CSI-RS forwards or backwards by taking the received CSI-RS as a reference from the data of the subframe where the received CSI-RS is stored in the CSI-RS receiving unit when the received CSI-RS is different from the calculated CSI-RS, intercepting the CSI-RS again, comparing the intercepted CSI-RS with the calculated CSI-RS, and confirming the time difference between the first carrier and the second carrier according to the adjusted time point of intercepting the CSI-RS when the intercepted CSI-RS is the same as the calculated CSI-RS.

The comparing unit is further configured to confirm that the first carrier is synchronized with the second carrier and the user equipment is synchronized with the first carrier when a time difference between the first carrier and the second carrier is smaller than a time threshold; and if the time difference between the first carrier and the second carrier exceeds a time threshold value, confirming that the first carrier and the second carrier are not synchronous and the user equipment and the first carrier are not synchronous.

The first carrier is an N-type carrier in Long Term Evolution (LTE), the second carrier is a backward compatible carrier in LTE R8/R9/R10, and the first carrier and the second carrier are paired carriers.

As shown in fig. 4, the present embodiment also provides an information transmission apparatus, including: a configuration unit and a transmission unit, wherein:

a configuration unit, configured to configure a carrier in Long Term Evolution (LTE);

a sending unit, configured to send configuration information of a carrier to User Equipment (UE), where the configuration information of the carrier includes one or more of a bandwidth of the carrier, a cell Identity (ID), a Cyclic Prefix (CP) type, channel state information measurement pilot (CSI-RS) configuration information, and a downlink transmission mode.

And a sending unit, configured to send the configuration information to the UE through a handover command, a measurement command, a UE-specific command, or a system broadcast message.

A sending unit, configured to send configuration information of a carrier to a user equipment through a backward compatible carrier paired with a carrier in LTE.

The cell ID is either a virtual cell ID or an actual physical cell ID.

The configuration information of the carrier further includes: and accessing the carrier wave at a frequency point.

A sending unit, further configured to set an information unit structure for the carrier in LTE, where the information unit structure includes one or more of the following: the method comprises the steps of carrier type information, access frequency points, bandwidth, cell ID, CP type, CSI-RS configuration information and a downlink transmission mode, wherein an information unit structure is quoted in a message, and the configuration information of carriers is sent to user equipment.

The downlink transmission mode comprises a downlink transmission mode 9, and the transmission mode of the data information corresponding to the downlink control information in the downlink transmission mode 9 in a Physical Downlink Shared Channel (PDSCH) is single-antenna port transmission or diversity transmission based on a user-specific reference signal; downlink Control Information (DCI) in the downlink transmission mode 9 adopts DCI Format1A or DCI Format 1.

The single antenna port transmission is a downlink transmission mode of single antenna port 7 transmission;

the user-specific reference signal based diversity transmission is a downlink transmission mode of the user-specific reference signal based diversity transmission.

The present embodiment also provides an information configuration apparatus, including: a configuration unit, wherein:

a configuration unit, configured to configure a carrier in Long Term Evolution (LTE) to adopt the same configuration information as a paired backward compatible carrier. The configuration information includes: cell Identification (ID) and CP type.

It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.

Claims

1. A method for detecting carrier synchronization, comprising:

the user equipment determines carrier information of a first carrier according to carrier information of a second carrier, and calculates channel state information measurement pilot frequency (CSI-RS) of the first carrier according to the carrier information of the first carrier;

2. The method of claim 1, wherein the carrier information comprises: a frame number, a subframe number, a slot number, and an index of an orthogonal frequency division multiplexing, OFDM, symbol.

3. The method of claim 2, wherein receiving CSI-RS from the first carrier according to carrier information of the first carrier comprises:

4. The method of claim 2, wherein calculating the CSI-RS for the first carrier based on carrier information for the first carrier comprises:

the user equipment calculates an initial value c of the CSI-RS of the first carrier according to the configuration information of the first carrier and the carrier information of the first carrier which are received in advance_initSaidWherein, said n_sIs the time slot number contained in the carrier information of the first carrier, the l is the index of the OFDM contained in the carrier information of the first carrier, theThe cell identifier contained in the configuration information of the first carrier is the N_CPThe CP type is a cyclic prefix CP type included in the configuration information of the first carrier.

5. The method of claim 4, further comprising:

the user equipment using placeInitial value c of the CSI-RS_initCalculating the channel state information measurement pilot frequency of the first carrier according to the time slot number of the first carrier and the index of the OFDM symbolThe above-mentionedWherein c is a sequence for generating CSI-RS, and the initial value of c is c_init，A number of resource blocks, RBs, for the first carrier.

6. The method of claim 1, wherein comparing the received CSI-RS with the calculated CSI-RS to confirm whether the first carrier and the second carrier are synchronized and whether the user equipment and the first carrier are synchronized comprises:

7. The method of claim 1, wherein comparing the received CSI-RS with the calculated CSI-RS to confirm whether the first carrier and the second carrier are synchronized and whether the user equipment and the first carrier are synchronized comprises:

8. The method of claim 3, further comprising:

9. The method of claim 8, further comprising:

10. The method of claim 1, further comprising:

and after confirming whether the first carrier and the second carrier are synchronous or not, the user equipment feeds back a result of whether the first carrier and the second carrier are synchronous or not to the base station through an ACK (acknowledgement), a non-acknowledgement NACK (negative acknowledgement) or a radio resource management RRM (radio resource management) measurement report.

11. The method of claim 1, wherein:

the first carrier is an N-type carrier in Long Term Evolution (LTE), the second carrier is a backward compatible carrier in LTE R8/R9/R10, and the first carrier and the second carrier are carriers used in a matched mode.

12. The method of claim 1 or 2, wherein the determining, by the ue, the carrier information of the first carrier according to the carrier information of the second carrier comprises:

13. An apparatus for detecting carrier synchronization, comprising: the device comprises a carrier information determining unit, a channel state information measurement pilot frequency CSI-RS calculating unit, a CSI-RS receiving unit and a comparing unit, wherein:

14. The apparatus of claim 13, wherein the carrier information comprises: a frame number, a subframe number, a slot number, and an index of an orthogonal frequency division multiplexing, OFDM, symbol.

15. The apparatus of claim 14, wherein:

the CSI-RS receiving unit is specifically configured to receive information from the first carrier, determine a location of a CSI-RS in the information according to pre-received CSI-RS configuration information, and obtain the CSI-RS from the information according to carrier information of the first carrier.

16. The apparatus of claim 14, wherein:

the CSI-RS calculating unit is specifically configured to calculate an initial value c of the CSI-RS of the first carrier according to the configuration information of the first carrier and the carrier information of the first carrier received in advance_initSaidWherein, said n_sIs the time slot number contained in the carrier information of the first carrier, the l is the index of the OFDM contained in the carrier information of the first carrier, theThe cell identifier contained in the configuration information of the first carrier is the N_CPThe CP type is a cyclic prefix CP type included in the configuration information of the first carrier.

17. The apparatus of claim 16, wherein:

the CSI-RS calculation unit is also used for using the initial value c of the CSI-RS_initCalculating the channel state information measurement pilot frequency of the first carrier according to the time slot number of the first carrier and the index of the OFDM symbolThe above-mentionedWherein c is a sequence for generating CSI-RS, and the initial value of c is c_init，A number of resource blocks, RBs, for the first carrier.

18. The apparatus of claim 13, wherein:

the comparing unit is specifically configured to confirm that the first carrier is synchronized with the second carrier and the user equipment is synchronized with the first carrier if the CSI-RS received by the CSI-RS receiving unit is the same as the CSI-RS calculated by the CSI-RS calculating unit.

19. The apparatus of claim 15, wherein:

the CSI-RS receiving unit is also used for storing all the data of the subframe where the received CSI-RS is located;

20. The apparatus of claim 19, wherein:

the comparing unit is further configured to confirm that the first carrier is synchronized with the second carrier and the ue is synchronized with the first carrier when a time difference between the first carrier and the second carrier is smaller than a time threshold; and if the time difference between the first carrier and the second carrier exceeds the time threshold value, confirming that the first carrier and the second carrier are not synchronous and the user equipment and the first carrier are not synchronous.