TWI462499B - Cell search apparatus and the method thereof - Google Patents

Description

Cell search method and device

The present invention relates to wireless communication technologies, and in particular, to a cell search method and device.

For cellular mobile communication systems, the duplex mode is the common way of uplink and downlink connections; for mobile communication devices (base stations or user equipment), the duplex mode is the common way to send and receive links. Time Division Duplex (TDD) and Frequency Division Duplex (FDD) are two basic duplex modes in wireless communication transmission. They are simultaneously supported in Long Term Evolution (LTE) systems. Time Division Duplex (TDD) mode and Frequency Division Duplex (FDD) mode. In the time division duplex mode, the uplink and downlink links use different time intervals for uplink and downlink signal transmission; while in the frequency division duplex mode, the uplink and downlink links use different working frequency bands for uplink and downlink signal transmission. For the duplex mode, refer to Figure 1 and Figure 2. Figure 1 is a schematic diagram of the duplex mode. Figure 2 is a schematic diagram of the time-frequency relationship in the basic duplex mode. In Figure 2, T represents time and R represents frequency.

For the basic duplex mode adopted by the cellular system: in the time division duplex mode, the uplink and downlink links use the same working frequency band, and the uplink and downlink signals are transmitted at different time intervals, and there is a guard interval between the uplink and the downlink. (Guard Period, GP); In the frequency division duplex mode, the uplink and downlink links use different working frequency bands, and the uplink and downlink signals can be transmitted on different frequency carriers at the same time, and there is a protection frequency between the uplink and the downlink. Guard Band.

In the basic time division duplex cellular mobile communication system, the mobile communication device (including the base station or the user equipment) also works in a time division duplex mode, and the device needs to have a transceiver switch; in the basic frequency division In the duplex mobile communication system, the mobile communication device (including the base station or the user equipment) also works in a frequency division duplex mode, and a transceiver duplex filter is required in the device.

In the long-term evolution system, the frequency division duplex mode and the time division duplex mode adopt different frame structures, which are described as follows: FIG. 3 is a time frame structure of a long-term evolution system frequency division duplex system. As shown in FIG. 3, in the frame structure of the long-term evolution system frequency division duplex system, a wireless time frame has a length of 10 ms and contains 10 sub-frames, each of which has a sub-frame. Two slots, each slot is 0.5 ms, and Ts is the sampling interval.

The time frame structure of the long-term evolution system time division duplex system is slightly more complicated. Figure 4 is a schematic diagram of the time frame structure of the long-term evolution system time division duplex system. As shown in Figure 4, a wireless time frame is also 10ms, which can include 1 or 2 special sub-time frames, the special sub-time frame is divided into 3 slots: Downlink Pilot Time Slot (DwPTS), guard interval (GP) and uplink pilot Uplink Pilot Time slot (UpPTS). Sub-time frame 0 and sub-time frame 5 and downlink pilot time slots are always used for downlink transmission, and other sub-time frames can be used for uplink transmission or downlink transmission as needed.

The length configuration of the three time slots of the special sub-time frame is shown in Table 1. Table 1 shows all the configuration modes of the special sub-time frame area.

For the structure of the frame in the time-division duplex system of the LTE system, another important configuration is the configuration of the sub-frames of the uplink and downlink sub-frames. The specific configuration is shown in Table 2 below. There are 7 configurations, D is used for downlink transmission, U is used for uplink transmission, and S is for sub-frame is a special sub-frame, including downlink pilot time slot (DwPTS) and guard interval (GP). And the uplink pilot time slot (UpPTS) three parts.

The downlink pilot time slot (DwPTS) field can transmit a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), and a physical HARQ indicator channel (physical HARQ Indicator Channel). , PHICH), physical downlink shared channel (PDSCH) and primary synchronization signal (PSS), uplink pilot time slot (UpPTS) domain can transmit physical random access channel (Physical Random Access Channel , PRACH) and the Sounding Reference Signal (SRS), which cannot transmit the Physical Uplink Shared Channel (PUSCH) and the Physical Uplink Control Channel (PUCCH).

The main functions of cell search are as follows:

1. The user equipment completes the synchronization of the downlink time and frequency through the cell search process, and identifies the cell identifier.

2. After completing the initial cell search, the user equipment receives the broadcast information sent by the base station to obtain system information.

3. The cell search is the first step of the user equipment accessing the system, and it is related to whether the user equipment can quickly and accurately access the system.

The basic principles of cell search mainly include the following:

1. The user equipment completes the downlink time and frequency synchronization by detecting the predefined synchronization signal sent by the base station, and identifies the identity of the cell.

2. The synchronization signal is a sequence commonly known by the base station and the user equipment, and different sequences represent different cell identifiers.

3. After completing the downlink synchronization, the user equipment receives the broadcast information sent by the base station, parses out the system information, and performs subsequent camping or cell reselection operations according to the system information.

The basic process design of cell search in Long Term Evolution System (LTE) is mainly:

1. After the user equipment is turned on, scanning is started on the frequency grid at intervals of 100KHz.

2. Perform detection of the primary synchronization channel at each frequency point.

1) Using three predefined primary synchronization sequences to correlate with the received time domain signals (time domain sampling points of at least 5 ms), take peaks for sequence determination, obtain slot synchronization points, complete slot synchronization and acquire parameters.

2) After the slot synchronization is completed, the loop first code (CP) type is blindly detected, and the loop first code type is determined.

3) According to the timing relationship between the secondary synchronization channel and the primary synchronization channel, the signal of the secondary synchronization channel is selected to detect the secondary synchronization sequence, and the loop shift values of the two m sequences are obtained. According to the relationship of the loop shifting element values, the half-time frame synchronization is completed and parameters are obtained.

3. After the synchronization detection is completed, the two parameters are combined to determine the cell identity, and then the downlink pilot is determined according to the cell identity, and the channel is estimated by the channel, the data is demodulated, and the broadcast information is read.

Figure 5 is a schematic diagram of the location of the synchronization signal in the long-term evolution frequency division duplex system. As shown in Figure 5, in the long-term evolution system, the primary and secondary synchronization signals are generated in the frequency division duplex mode and the time division duplex mode. It is exactly the same. Due to the difference in the frame structure, the difference between the transmission position of the primary synchronization signal and the secondary synchronization signal in the frequency division duplex mode and the time division duplex mode is as follows: Long Term Evolution Frequency Division Duplex System The primary synchronization signal PSS is located at the last Orthogonal Frequency Division Multiplex (OFDM) symbol position of the sub-time frame 0 and the sub-time frame 5, and the secondary synchronization signal SSS is located at the inverse of the sub-time frame 0 and the sub-time frame 5. 2 orthogonal frequency division multiplexing (OFDM) symbol positions.

6 is a schematic diagram of the location of the synchronization signal in the long-term evolution frequency division duplex system. As shown in FIG. 6, the primary synchronization signal PSS of the long-term evolution frequency division duplex system is located in the downlink pilot time slot of the sub-time frame 1 and the sub-time frame 6. At the third orthogonal frequency division multiplexing (OFDM) symbol position of (DwPTS), the secondary synchronization signal S-SCH is located at the last orthogonal frequency division multiplexing (OFDM) symbol position of sub-frame 0 and sub-time box 5. .

The disadvantage of the prior art is that the user equipment (FDD UE) supporting the frequency division duplex mode and the user equipment (TDD UE) supporting the time division duplex mode can not perform cell search in the same communication system at the same time. Technical solutions.

The technical problem to be solved by the present invention is to provide a cell search method and device.

The embodiment of the present invention provides a cell search method, including: the user equipment receives the synchronization signal and searches for the primary synchronization signal; the user equipment searches for more than one primary synchronization signal related peak position and corresponding primary synchronization in the related search window. The user equipment searches for the secondary synchronization signal correlation peak according to the relative positional relationship between the primary synchronization signal and the secondary synchronization signal specified by the protocol of the duplex mode supported by the user equipment, based on the peak position of one of the primary synchronization signals; If the secondary synchronization signal correlation peak is searched, the cell preliminary search is completed, and the corresponding secondary synchronization signal sequence is identified; otherwise, the following primary synchronization signal correlation peak position is used as a reference, and the secondary synchronization signal correlation peak is continuously searched according to the relative positional relationship. Until the initial cell search is completed.

The present invention provides a user equipment for cell search, comprising: a receiving module for receiving a synchronization signal; a search module for searching for a primary synchronization signal, and searching for more than one primary synchronization signal correlation peak in the relevant search window The position and the corresponding primary synchronization sequence; the detection module is configured to compare the relative position of the primary synchronization signal and the secondary synchronization signal according to the agreement of the duplex mode supported by the user equipment based on the peak position of one of the primary synchronization signals. The positional relationship searches for the secondary synchronization signal correlation peak; if the secondary synchronization signal correlation peak is searched, the cell preliminary search is completed, and the corresponding secondary synchronization signal sequence is identified; otherwise, the following primary synchronization signal correlation peak position is used as a reference, according to the The relative position relationship searches for the secondary synchronization signal correlation peak until the cell preliminary search is completed.

In the embodiment of the present invention, a base station is further provided, including: a primary synchronization determining module, configured to determine one or more primary synchronization signals; and a sending module, configured to send one or more primary synchronization signals.

The beneficial effects of the present invention are as follows. As can be seen from the above, in the embodiment of the present invention, a method for enabling a user equipment supporting different duplex modes to perform cell search in the same communication system at the same time is provided, and the cell search method can be used to speed up the user. The access process of the device in the communication system. In particular, when the base station simultaneously transmits the synchronization signal and the synchronization sequence of the frequency division duplexing and the time division duplexing mode on the same carrier, the frequency division duplex user equipment and the time division duplex user equipment cell can be accelerated. Search speed.

The inventors of the present invention have noticed in the course of the invention that in addition to the difference in the frame structure, other differences in the frequency division duplex (FDD) mode and the time division duplex (TDD) mode in the long term evolution system mainly exist in The difference in the duplex mode itself is that the continuous sub-frame operation is used in the frequency division duplex mode, and the uplink or downlink sub-frame in the time division duplex mode is not in time. Continuous, resulting in some differences in uplink and downlink scheduling and retransmission timing and control procedures. However, in other basic transmission techniques, frequency division duplexing and time division duplexing are exactly the same, which is a further fusion of the two. A condition is provided that considers a fusion mode of frequency division duplexing and time division duplexing, and simultaneously supports frequency division duplex user equipment and time division duplex user on a pair of time division duplex carriers having some features. The device is accessed, and the specific embodiments of the present invention are described below with reference to the accompanying drawings.

FIG. 7 is a schematic diagram of a cell search method implementation process. As shown in FIG. 7 , the cell search may include the following steps: Step 701: The user equipment searches for a primary synchronization signal; Step 702: The user equipment searches for a related search window. The primary synchronization signal related peak position and the corresponding primary synchronization sequence; in step 703, the user equipment is a frequency division duplex user equipment, and the user equipment uses the peak position of one of the primary synchronization signals as a reference, according to the frequency division The relative position relationship between the primary synchronization signal and the secondary synchronization signal defined by the duplex agreement searches for the peak of the secondary synchronization signal; if the user equipment is a time division duplex user equipment, the user equipment uses one of the primary synchronization signal correlation peak positions For the reference, the secondary synchronization signal correlation peak is searched according to the relative positional relationship between the primary synchronization signal and the secondary synchronization signal specified by the time division duplex protocol; step 704, if the secondary synchronization signal correlation peak is searched, the cell preliminary search is completed, and the cell identification is completed. Corresponding secondary sync signal sequence; otherwise one of the following primary sync signal related peak positions Baseline, repeat step 703, until the completion of the initial search area.

That is, in step 703, the frequency division duplex user equipment searches for the secondary synchronization signal correlation according to the relative positional relationship between the primary synchronization signal and the secondary synchronization signal specified by the frequency division duplex protocol based on the peak position of one of the primary synchronization signals. The frequency-division duplex user equipment searches for the secondary synchronization signal correlation peak according to the relative positional relationship between the primary synchronization signal and the secondary synchronization signal specified by the time division duplex protocol based on the peak position of one of the primary synchronization signals; If the secondary synchronization signal correlation peak is searched, the cell preliminary search is completed, and the corresponding secondary synchronization signal sequence is identified; otherwise, the following primary synchronization signal related peak position is used as a reference, and step 703 is repeated until the cell preliminary search is completed.

In an embodiment, the duplex mode type supported by the user equipment may be selected from the following duplex mode types: Frequency Division Duplex (FDD), Time Division Duplex (TDD), and Half Frequency Division Duplex.

In an embodiment, before the user equipment searches for the primary synchronization signal, the user equipment may further include: the user equipment simultaneously receives the frequency division duplex on the carrier that supports the frequency division duplex user equipment and the time division duplex user equipment. The synchronization signal specified by the system and the time division duplex system.

In an embodiment, the synchronization signal may include a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), and the synchronization sequence may include a Primary Synchronization Signal (PSS) sequence and a Secondary Synchronization Signal (SSS) sequence.

In an embodiment, the base station may not schedule the transmission of the downlink data packet on the time-frequency resources occupied by the primary synchronization signal PSS and the secondary synchronization signal SSS.

Further explanation will be given below.

Figure 8 is a schematic diagram of the location of the synchronization signal during cell search. As shown in Figure 8, the frequency division duplex system is simultaneously transmitted on the carrier supporting both the frequency division duplex user equipment and the time division duplex user equipment. The synchronization signal specified by the duplex system includes a primary synchronization signal PSS and a secondary synchronization signal SSS.

The sequence of the primary synchronization signals PSS of the frequency division duplex system and the time division duplex system may be the same or different; the sequence of the secondary synchronization signals SSS of the frequency division duplex system and the time division duplex system may be the same or different; in the embodiment, The user equipment searches for the primary synchronization signal according to the existing algorithm, and the user equipment searches for the PSS correlation peaks of the two primary synchronization signals within 5 ms, identifies the PSS sequence of the primary synchronization signals corresponding to the two peaks, and completes the downlink orthogonal division. Frequency multiplex (OFDM) symbol synchronization, slot synchronization, and Cyclic Prefix (CP) length detection; the user equipment can assume that one of the primary synchronization signals PSS correlation peak position and the primary synchronization signal PSS sequence are correctly searched. And the relative orthogonal frequency division multiplexing (OFDM) symbol position detection of the secondary synchronization signal SSS and the primary synchronization signal PSS synchronization signal in the protocol specification corresponding to the supported duplex mode (frequency division duplex or time division duplex) The secondary synchronization signal SSS correlation peak, the specific detection algorithm can be implemented by using existing algorithms.

If the secondary synchronization signal SSS correlation peak cannot be detected at the corresponding location, it indicates that the primary synchronization signal PSS correlation peak is wrong, or does not match the duplex mode supported by the user equipment, and another primary synchronization signal is used at this time. The PSS peak position and the primary synchronization signal PSS sequence are referenced, and the secondary synchronization signal SSS and the primary synchronization signal PSS are orthogonal according to the protocol specification corresponding to the duplex mode (frequency division duplex or time division duplex) supported by the user equipment. The frequency division multiplexing (OFDM) symbol position detection SSS correlation peak; on the contrary, if the secondary synchronization signal SSS correlation peak is detected at the corresponding position, it indicates that the primary synchronization signal PSS correlation peak is correct, and the user equipment successfully completes The detection of the primary synchronization signal PSS and the secondary synchronization signal SSS obtains a physical layer cell identifier (Cell ID); in the embodiment, the base station can also use the time frequency occupied by the two sets of primary synchronization signal PSS and secondary synchronization signal SSS. The transmission of downlink packets is not scheduled on the resource.

FIG. 9 is a schematic flowchart of a cell search process performed by a frequency division duplex user equipment and a time division duplex user equipment. As shown in FIG. 9, the method may include the following steps: a frequency division duplex user equipment search process is: steps 901, the user equipment performs a primary synchronization signal PSS signal search; step 902, searches for two primary synchronization signal PSS correlation peak positions and a corresponding primary synchronization signal PSS sequence; step 903, assuming that one of the correlation peak positions is the correct primary synchronization Signal PSS position, detecting the secondary synchronization signal SSS signal according to the position specified by the frequency division duplex protocol; step 904, determining whether the secondary synchronization signal SSS correlation peak is detected and identifying the secondary synchronization signal SSS sequence, if yes, proceeding to step 905, otherwise, Go to step 903; Step 905, complete the cell search.

The search process of the time division duplex user equipment is: step 906, the user equipment performs a primary synchronization signal PSS signal search; step 907, searches for two primary synchronization signal PSS correlation peak positions and a corresponding primary synchronization signal PSS sequence; 908, assuming that one of the correlation peak positions is the correct primary synchronization signal PSS position, detecting the secondary synchronization signal SSS signal according to the position specified by the time division duplex protocol; step 909, determining whether the secondary synchronization signal SSS correlation peak is detected and identifying the auxiliary Synchronous signal SSS sequence, if yes, go to step 901, otherwise go to step 908; step 910, complete cell search.

In order to better understand the communication method that the technical solution provided by the present invention can be combined, a communication method that can provide a multi-duplex mode type communication service can be described below.

FIG. 10 is a schematic diagram of a signal transmission method implementation process. The signal transmission process may include the following steps: Step 1001: Determine a duplex mode supported by the user equipment; Step 1002: The network side adopts a time division manner according to a double supported by the user equipment. The mode of operation and the user equipment are transmitted by signals.

In an embodiment, when the signal transmission is performed by the user equipment in the duplex mode supported by the user equipment in a time division manner, the method may include: duplexing supported by the user equipment on at least two non-contiguous carriers. The mode and the user equipment perform signal transmission, and the frequency interval of the carrier satisfies the uplink and downlink frequency interval requirements of the frequency division duplex.

In an embodiment, at least two non-contiguous carriers may be at least two non-contiguous time division duplex carriers.

The following is an example of frequency division duplexing and time division duplexing in duplex mode.

FIG. 11 is a schematic diagram of resource allocation when performing signal transmission in the frequency division duplex/time division duplex mode, which will be described below with reference to FIG.

In an embodiment, there are at least two non-contiguous time division duplex carriers in the communication system, such as time division duplex carrier 1 and time division duplex carrier 2 as shown in FIG. 11, and the frequencies of the two carriers The interval meets or exceeds the uplink and downlink frequency interval requirements of the frequency division duplex. In the specific embodiment, the frequency division duplex uplink and downlink frequency interval requirement may be defined by the current stage radio frequency indicator, or may be an improvement of the device level at a certain stage in the future. The RF indicator requirements are then redefined.

Further, the method may further include: one or more time division duplex carriers for signal transmission with the user equipment or one or more frequency division duplex carriers for signal transmission with the user equipment or both.

That is, there may be one or more other time division duplex carriers in the communication system; and/or there may be one or more other frequency division duplex carriers, which may be single direction frequency division duplex carriers. For example, a downlink carrier or an uplink carrier; or a frequency division duplex carrier that appears in pairs, that is, an uplink carrier and a downlink carrier.

In an embodiment, the uplink and downlink sub-time frame allocation manners configured for each pair of non-contiguous time division duplex carriers may be different.

For example, two non-contiguous time-division duplex carriers can be configured in different uplink and downlink sub-timebox allocation modes. As shown in FIG. 11, the time-division duplex carrier 1 is configured as an uplink-downlink allocation mode 2, and a time-division duplex carrier. 2 is configured as the uplink and downlink allocation mode 0.

In an embodiment, the sub-time frames of each pair of time-division duplex carriers may be out of synchronization, and the sub-time frame deviation time is an integer multiple of the sub-time frame length.

For example, the sub-time frames of two time-division duplex carriers may also be out of synchronization, but the offset time is an integer multiple of the length of the sub-time frame.

In an embodiment, each pair of time division duplex carriers is not synchronized, and each pair of time division duplex carriers has the same uplink and downlink allocation manner; or each pair of time division duplex carriers is synchronized with each other. The configuration of the uplink and downlink allocation modes of a pair of time division duplex carriers is different; or, the time frame of each pair of time division duplex carriers is not synchronized, and the configuration of uplink and downlink allocation modes of each pair of time division duplex carriers is different.

For example, when the two time division duplex carriers in FIG. 11 have the following possibilities, the solution provided by the embodiment of the present invention is also achievable:

A), the two time division duplex carriers are not synchronized, and the two time division duplex carriers are configured to be the same uplink and downlink allocation mode;

B), two time division duplex carriers are time frame synchronized, and two time division duplex carriers are configured into different uplink and downlink allocation modes;

C), the two time division duplex carriers are not synchronized, and the two time division duplex carriers are configured in different uplink and downlink allocation modes.

In an embodiment, any one of the carriers may be scheduled to be used by the user equipment of the long-term evolution time division duplex user equipment or the single-carrier long-term evolution time division duplex system; or, the transmission direction of the at least two carriers may be Configuring the same sub-timebox resource to be simultaneously scheduled for the user equipment of the long-term evolution time division duplex system that needs to support large bandwidth transmission; or, the sub-time frame resources with different transmission directions configured on at least two carriers can be simultaneously scheduled. Used for user equipment with a long term evolution time division duplex system with simultaneous transmit and receive capabilities on both carriers.

For the two time division duplex carriers described above, any sub-timebox resources on each carrier can be scheduled for use by the time division duplex user equipment. E.g:

A), the sub-time frame resource on a single carrier can be provided to any time-division duplex user equipment;

B), the sub-time frame resources with the same transmission direction configuration on the two carriers can be simultaneously scheduled for use by the user equipment of the long-term evolution time division duplex system that needs to support the large bandwidth transmission;

C), the sub-timebox resources with different transmission direction configurations on the two carriers can be simultaneously scheduled to have long-term evolution time-division double with simultaneous transmission/reception capability (one carrier reception and another carrier transmission) on the two carriers. The user equipment of the system is used.

In an embodiment, the sub-time frame resources with opposite transmission directions configured on the two carriers may be simultaneously scheduled for use by the frequency division duplex user equipment.

For example, for the two time-division duplex carriers described above, the sub-timebox resources with opposite transmission direction configurations on the two carriers can be simultaneously scheduled for use by the frequency division duplex user equipment.

In the embodiment, when the same sub-time frame resource is configured on the two carriers, the discontinuous reception (DRX) state may be configured for the frequency division duplex user equipment to reduce the power consumption of the user equipment.

Based on the same inventive concept, the user equipment and the base station are also provided in the embodiment of the present invention. Since the principle of solving the problem is similar to the cell search method, the implementation of the device may refer to the implementation of the method, and the repetition is not Let me repeat.

FIG. 12 is a schematic structural diagram of a user equipment. The user equipment may include: a search module 1201, configured to search for a primary synchronization signal, and search for more than one primary synchronization signal related peak position and corresponding main in the related search window. a synchronization module; a detection module 1202, for the frequency division duplex user equipment, the detection module 1202 of the user equipment is configured to use one of the primary synchronization signal correlation peak positions as a reference, according to a frequency division duplex agreement The relative positional relationship between the primary synchronization signal and the secondary synchronization signal searches for the secondary synchronization signal correlation peak; for the time division duplex user equipment, the detection module 1202 of the user equipment is used to correlate one of the primary synchronization signal correlation peaks The location is used as a reference, and the secondary synchronization signal correlation peak is searched according to the relative positional relationship between the primary synchronization signal and the secondary synchronization signal specified by the time division duplex agreement; if the secondary synchronization signal correlation peak is searched, the preliminary cell search is completed, and the corresponding corresponding Secondary synchronization signal sequence; otherwise, the following one primary synchronization signal correlation peak position is the reference search secondary synchronization signal correlation peak Value until the initial cell search is completed.

In an embodiment, the duplex mode type supported by the user equipment may be selected from the following duplex mode types: frequency division duplex, time division duplex, and half frequency division duplex.

In an embodiment, the user equipment may further include: a receiving module 1203, configured to support the frequency division duplex user equipment and the time division duplex user equipment access before the user equipment searches for the main synchronization signal. Simultaneously receive the synchronization signals specified by the frequency division duplex system and the time division duplex system on the carrier.

In an embodiment, the search module may be further configured to search for a synchronization signal including a primary synchronization signal PSS and a secondary synchronization signal SSS, including a synchronization sequence of a primary synchronization signal PSS sequence and a secondary synchronization signal SSS sequence.

FIG. 13 is a schematic structural diagram of a base station used in conjunction with a user equipment, where the base station is configured to determine a synchronization signal including a primary synchronization signal PSS and a secondary synchronization signal SSS, including synchronization of a primary synchronization signal PSS sequence and a secondary synchronization signal SSS sequence. The sequence, as shown in the figure, may include: a primary synchronization determining module 1301 for determining one or more primary synchronization signals; and a transmitting module 1302 for transmitting the one or more primary synchronization signals.

In the implementation, the sending module may be further configured to simultaneously send the synchronous signal specified by the frequency division duplex system and the time division duplex system on the carrier supporting the frequency division duplex user equipment and the time division duplex user equipment. .

The base station may further include: a time-frequency module 1303, configured to determine time-frequency resources occupied by the user equipment in the primary synchronization signal PSS and the secondary synchronization signal SSS; and a scheduling module 1304, configured to be used in the primary synchronization signal PSS and the secondary The transmission of the downlink data packet is not scheduled on the time-frequency resource occupied by the synchronization signal SSS.

In order to better utilize the technical solution provided by the embodiment of the present invention, any device described above may also be considered in combination with the following network side device and/or user device, which will be described below.

FIG. 14 is a schematic structural diagram of a network side device. The network side device may include: a duplex determination module 1401 for determining a duplex mode supported by the user equipment; and a signal transmission module 1402 for pressing the time division manner. The duplex mode supported by the user equipment transmits signals to the user equipment.

In an embodiment, the signal transmission module may be further configured to press the user equipment on at least two non-contiguous carriers when the signal is transmitted by the user equipment in a duplex mode supported by the user equipment in a time division manner. The supported duplex mode performs signal transmission with the user equipment, and the frequency interval of the carrier satisfies the uplink and downlink frequency interval requirements of the frequency division duplex.

In an embodiment, the at least two non-contiguous carriers used by the signal transmission module are at least two non-contiguous time division duplex carriers.

In an embodiment, the signal transmission module may be further configured to perform signal transmission with the user equipment on one or more other time division duplex carriers, and/or in one or more other frequency division duplex carriers and use The device transmits signals.

In an embodiment, the signal transmission module may be further configured to allocate different uplink and downlink sub-time frames of each pair of non-contiguous time division duplex carriers.

In an embodiment, the signal transmission module may be further configured to make the sub-time frames of each pair of time-division duplex carriers out of synchronization, and the sub-time frame deviation time is an integer multiple of the length of the sub-time frame.

In an embodiment, the signal transmission module may be further configured to make each pair of time division duplex carriers sub-time frames unsynchronized, and each pair of time division duplex carriers has the same uplink and downlink allocation manner; or, each pair of time divisions The duplex carrier is synchronized in time frame, and the uplink and downlink allocation modes of each pair of time division duplex carriers are configured differently; or each pair of time division duplex carriers is not synchronized, and each pair of time division duplex carriers is up and down. The line allocation method configuration is different.

In an embodiment, the signal transmission module may be further used to schedule any one of the carriers to the user equipment (LTE-A TDD UE) of the long term evolution time division duplex system or the long-term evolution time division duplex system of the single carrier. (LTE-A TDD UE) is used; or, the child time frame resources with the same transmission direction configured on at least two carriers are simultaneously scheduled for use by the user equipment of the long-term evolution time division duplex system that needs to support large bandwidth transmission. Or, the sub-timebox resources with different transmission directions configured on the at least two carriers are simultaneously scheduled for use by the user equipment having the long-term evolution time division duplex system with simultaneous transmit and receive capabilities on the two carriers.

In an embodiment, the signal transmission module may be further configured to simultaneously schedule the sub-time frame resources whose transmission directions are opposite on the two carriers to be used by the frequency division duplex user equipment.

In an embodiment, the signal transmission module may be further configured to configure a discontinuous reception (DRX) state for the frequency division duplex user equipment when the transmission of the same sub-time frame resource is configured on the two carriers.

FIG. 15 is a schematic structural diagram of a user equipment. The user equipment may include: a duplex determination module 1501 for determining a duplex mode supported by the user equipment; and a signal transmission module 1502 for pressing the time division manner. The duplex mode supported by the user equipment and the network side perform signal transmission.

In an embodiment, the signal transmission module may be further configured to perform signal transmission on the at least two non-contiguous carriers according to a frequency division duplex duplex mode supported by the user equipment, where the frequency interval of the carrier satisfies the frequency. The uplink and downlink frequency interval requirements of the duplex are performed; the signal transmission is performed on the network side by the time division duplex duplex mode supported by the user equipment on any one or two upper carriers.

In an embodiment, the at least two non-contiguous carriers used by the signal transmission module are at least two non-contiguous time division duplex carriers.

In an embodiment, the signal transmission module may be further configured to perform signal transmission on one or more other time division duplex carriers and the network side, or perform signal transmission on one or more other frequency division duplex carriers and the network side. Or both.

For the convenience of description, the various parts of the above described devices are separately described by functions into various modules or units. Of course, the functions of the modules or units can be implemented in the same or multiple software or hardware in the practice of the present invention.

It can be seen from the above that the embodiment of the present invention provides a scheme for enabling a frequency division duplex user equipment and a time division duplex user equipment to perform cell search in the same communication system at the same time, and the cell search scheme can speed up the user. The access process of the device in the communication system. In particular, when the base station simultaneously transmits the synchronous signal and the synchronization sequence of the frequency division duplexing and the time division duplexing on the same carrier, the frequency division duplex user equipment and the time division duplex user equipment cell can be accelerated. Search speed.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Thus, the present invention can take the form of a fully hardware embodiment, a fully software embodiment, or an embodiment combining soft and hardware aspects. Moreover, the present invention may take the form of a computer program product embodied on one or more computer usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer usable code therein. .

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus, and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor or other programmable data processing device to produce a machine for executing instructions by a processor of a computer or other programmable data processing device Means are provided for implementing the functions specified in one or more of the flow or in one or more blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can boot a computer or other programmable data processing device to operate in a particular manner, such that instructions stored in the computer readable memory produce an article of manufacture including the instruction device. The instruction means implements the functions specified in one or more blocks of the flow or in a flow or block diagram of the flowchart.

The detailed description of the preferred embodiments of the present invention is intended to be limited to the scope of the invention, and is not intended to limit the scope of the invention. The patent scope of this case.

In summary, this case is not only innovative in terms of space type, but also can enhance the above-mentioned multiple functions compared with the customary items. It should fully meet the statutory invention patent requirements of novelty and progressiveness, and apply for it according to law. This invention patent application, in order to invent invention, to the sense of virtue.

701. . . Step 701

702. . . Step 702

703. . . Step 703

704. . . Step 704

901. . . Step 901

902. . . Step 902

903. . . Step 903

904. . . Step 904

905. . . Step 905

906. . . Step 906

907. . . Step 907

908. . . Step 908

909. . . Step 909

910. . . Step 910

1001. . . Step 1001

1002. . . Step 1002

1201. . . Search module

1202. . . Detection module

1203. . . Receiving module

1301. . . Master synchronization determination module

1302. . . Sending module

1303. . . Time-frequency module

1304. . . Scheduling module

1401. . . Duplex determination module for network side equipment

1402. . . Signal transmission module of network side device

1501. . . User equipment duplex determination module

1502. . . User equipment signal transmission module

1(a), (b), and (c) are schematic diagrams showing the principle of the duplex mode in the prior art;

2 is a schematic diagram of a time-frequency relationship in a basic duplex mode in the prior art;

3 is a schematic diagram of a time frame structure in a long term evolution frequency division duplex system in the prior art;

4 is a schematic diagram of a time frame structure in a long term evolution time division duplex system in the prior art;

5 is a schematic diagram of a location of a synchronization signal in a long term evolution frequency division duplex system in the prior art;

6 is a schematic diagram showing the location of a synchronization signal in a long term evolution time division duplex system in the prior art;

FIG. 7 is a schematic flowchart of an implementation process of a cell search method according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a location of a synchronization signal during cell search according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic flowchart of an implementation process of performing cell search by a user equipment (FDD UE) supporting a frequency division duplex mode and a user equipment (TDD UE) supporting a time division duplex mode according to an embodiment of the present invention;

FIG. 10 is a schematic flowchart of an implementation process of a signal transmission method according to an embodiment of the present invention; FIG.

FIG. 11 is a schematic diagram of resource configuration when signal transmission is performed in a frequency division duplex/time division duplex mode according to an embodiment of the present invention; FIG.

FIG. 12 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of a base station used in conjunction with a user equipment according to an embodiment of the present invention; FIG.

FIG. 14 is a schematic structural diagram of a network side device according to an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.

701. . . Step 701

702. . . Step 702

703. . . Step 703

704. . . Step 704

Claims (12)

A cell search method includes: a user equipment receives a synchronization signal and searches for a primary synchronization signal; the user equipment searches for more than one primary synchronization signal related peak position and a corresponding primary synchronization sequence in the relevant search window; the user equipment A primary synchronization signal related peak position is used as a reference, and the secondary synchronization signal correlation peak is searched according to the relative positional relationship between the primary synchronization signal and the secondary synchronization signal specified by the agreement of the duplex mode supported by the user equipment; if the secondary synchronization signal is searched for If the peak value is completed, the cell preliminary search is completed, and the corresponding secondary synchronization signal sequence is identified; otherwise, the following primary synchronization signal correlation peak is used as a reference, and the secondary synchronization signal correlation peak is continuously searched according to the relative positional relationship until the cell preliminary search is completed. The cell search method of claim 1, wherein the duplex mode type supported by the user equipment is selected from the following duplex mode types: frequency division duplex, time division duplex, and half frequency division duplex. The cell search method of claim 2, wherein the user equipment simultaneously receives a frequency on a carrier that supports a user equipment having a frequency division duplex mode and a user equipment having a time division duplex mode. Synchronization signals specified by the duplex system and the time division duplex system. The cell search method of claim 3, wherein the synchronization signal comprises a primary synchronization signal and a secondary synchronization signal. For example, in the cell search method described in claim 1, the base station does not schedule the transmission of the downlink data packet on the time-frequency resource occupied by the synchronization signal. A user equipment for cell search, comprising: a receiving module for receiving a synchronization signal; a search module for searching for a primary synchronization signal; and searching for more than one primary synchronization signal related peak position in the relevant search window and Corresponding primary synchronization sequence; a detection module for determining the relative position of the primary synchronization signal and the secondary synchronization signal according to the agreement of the duplex mode supported by the user equipment based on the peak position of one of the primary synchronization signals Correlation search for the secondary synchronization signal correlation peak; if the secondary synchronization signal correlation peak is searched, the cell preliminary search is completed, and the corresponding secondary synchronization signal sequence is identified; otherwise, the following primary synchronization signal correlation peak position is used as a reference, according to the relative position The relationship continues to search for secondary sync signal related peaks until a preliminary cell search is completed. The user equipment for cell search according to claim 6, wherein the duplex mode type supported by the user equipment is selected from the following duplex mode types: frequency division duplex, time division duplex, and half frequency division. work. The user equipment for cell search according to claim 6, wherein the receiving module is configured to support user equipment with frequency division duplex mode and user equipment with time division duplex mode Simultaneously receive the synchronization signals specified by the frequency division duplex system and the time division duplex system on the carrier. The user equipment of the cell search as described in claim 6 , wherein the receiving module is configured to receive the primary synchronization signal and the secondary synchronization signal. A base station comprising: a primary synchronization determining module for determining more than one primary synchronization signal; a transmitting module for transmitting more than one primary synchronization signal; wherein the transmitting module is configured to support The user equipment of the frequency division duplex mode and the carrier connected to the user equipment with the time division duplex mode simultaneously transmit the synchronization signals specified by the frequency division duplex system and the time division duplex system. The base station according to claim 10, wherein the transmitting module is configured to send the primary synchronization signal and the secondary synchronization signal specified by the frequency division duplex system on the carrier, and the primary synchronization specified by the time division duplex system. Signal and secondary sync signals. The base station as described in claim 10, further comprising: a time-frequency determining module for determining a time frequency occupied by the primary synchronization signal and the secondary synchronization signal A scheduling module is configured to not schedule the sending of the downlink data packet on the time-frequency resources occupied by the primary synchronization signal and the secondary synchronization signal.