WO2011057472A1 - Procédé et dispositif de recherche de cellule - Google Patents

Procédé et dispositif de recherche de cellule Download PDF

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Publication number
WO2011057472A1
WO2011057472A1 PCT/CN2010/001728 CN2010001728W WO2011057472A1 WO 2011057472 A1 WO2011057472 A1 WO 2011057472A1 CN 2010001728 W CN2010001728 W CN 2010001728W WO 2011057472 A1 WO2011057472 A1 WO 2011057472A1
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Prior art keywords
synchronization signal
tdd
fdd
primary synchronization
correlation peak
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PCT/CN2010/001728
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English (en)
Chinese (zh)
Inventor
潘学明
胡金玲
肖国军
张�杰
王立波
缪德山
杨宇
Original Assignee
电信科学技术研究院
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Publication of WO2011057472A1 publication Critical patent/WO2011057472A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H04J11/0076—Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group

Definitions

  • the present invention relates to wireless communication technologies, and in particular, to a cell search method and device. Background wipe
  • the duplex mode is the multiplexing mode of the uplink and downlink; for mobile communication devices (base station or UE), the duplex mode is the multiplexing mode of the transmit and receive links.
  • TDEX Time Division Duplex (Time Division Duplex) and FDD (Frequency Division Duplex) are two basic duplex modes in wireless communication transmission. They support TDD mode in LTE (Long Term Evolution) system. And FDD mode. In TDD mode, the uplink and downlink use different time intervals for uplink and downlink signal transmission; while in FDD mode, the uplink and downlink use different working frequency bands for uplink and downlink signal transmission.
  • 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.
  • TDD mode the uplink and downlink use the same working frequency band, and the uplink and downlink signals are transmitted at different time intervals. There is a GP between the uplink and the downlink. Period, guard interval);
  • FDD mode the uplink and downlink use different working frequency bands, and can transmit uplink and downlink signals on different frequency carriers at the same time, with protection bandwidth between uplink and downlink (Guard Band) ).
  • a mobile communication device (including a base station or a UE) also operates in a TDD mode, and a transceiving switch is required in the device; in a basic FDD cellular mobile communication system, a mobile communication device ( Including base stations or UEs) Therefore, a transceiver duplex filter is required in the device.
  • the FDD mode and the TDD mode use different frame structures, as described below:
  • FIG. 3 is a schematic diagram of a frame structure of an LTE FDD system.
  • a radio frame has a length of 10 ms, contains 10 subframes, and each slot has 2 slots (slots). ), each slot is 0,5ms, and Ts is the sampling interval.
  • FIG. 4 is a schematic diagram of the frame structure of the LTE TDD system.
  • one radio frame is also 10 ms, and may include one or two special subframes.
  • the frame is divided into three time slots: DwPTS (Downlink Pilot Time Slot), GP and UpPTS (Uplink Pilot Time slot).
  • Subframe 0 and subframe 5 and DwPTS are always used for downlink transmission, and other subframes can be used for uplink transmission or downlink transmission as needed.
  • Table 1 shows all the configuration methods of the special subframe area.
  • D indicates that it is used for downlink transmission
  • U indicates for uplink transmission
  • S indicates that the subframe is a special subframe, including DwPTS, GP, and UpPTS. three parts.
  • the DwPTS domain can transmit a PCFICH (Physical Control Format Indicator Channel), a PDCCH (hysical downlink control channel), a PKCH (physical HARQ Indicator Channel), and a PDSCH (Physical HARQ Indicator Channel).
  • PCFICH Physical Control Format Indicator Channel
  • PDCCH physical downlink control channel
  • PKCH physical HARQ Indicator Channel
  • PDSCH Physical HARQ Indicator Channel
  • Downlink Shared Channel Physical Synchronization Signal (PSS) and PSS (Primary Synchronization Signal)
  • UpPTS domain can transmit PRACH (Physical Random Access Channel) and SRS (Sounding Reference Signal) Signal)
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • the UE completes the synchronization of the downlink time and frequency through the cell search process, and identifies the cell id.
  • the UE After completing the initial cell search, the UE receives the wide message sent by the base station to obtain system information.
  • the cell search is the first step of the UE accessing the system, and it is related to whether the UE can access the system quickly and accurately.
  • the basic principles of cell search mainly include the following:
  • the UE completes the downlink time and frequency by detecting a predefined synchronization signal sent by the base station. Synchronize and identify the id of the cell.
  • the synchronization signal is a sequence commonly known by the base station and the UE, and different sequences represent different cell id numbers.
  • the UE After completing the downlink synchronization, the UE 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 LTE system is mainly as follows:
  • the UE After the UE is powered on, it starts scanning on the frequency grid separated by ⁇ ⁇ .
  • the CP type is blindly detected to determine the CP type.
  • the signal of the secondary synchronization channel is selected to detect the secondary synchronization sequence, and the cyclic shift values of the two m sequences are obtained. According to the relationship of the cyclic shift value, the half frame synchronization is completed and the parameter ⁇ 1 is obtained .
  • the cell id is determined by combining two parameters, then the downlink pilot is determined according to the cell id number, and the channel is estimated by the broadcast channel, the data is demodulated, and the broadcast information is read.
  • FIG. 5 is a schematic diagram of the location of a synchronization signal in an LTE FDD system.
  • the primary and secondary synchronization signals in the FDD mode and the TDD mode are generated in exactly the same manner, and the FDD mode is adopted due to the difference in frame structure.
  • the difference between the transmission position of the primary synchronization signal and the secondary synchronization signal in the TDD mode is as follows:
  • the primary synchronization signal PSS of the LTE FDD system is located at the last OFDM (Orthogonal Frequency Division Multiplex) symbol position of subframe 0 and subframe 5, and the secondary synchronization signal SSS is located at the last of subframe 0 and subframe 5. 2 OFDM symbol positions.
  • Figure 6 is a schematic diagram of the location of the synchronization signal in the LTE TDD system, as shown in Figure 6, LTE TDD
  • the primary synchronization signal PSS of the system is located at the third OFDM symbol position of the DwPTS of subframe 1 and subframe 6, and the secondary synchronization signal S-SCH is located at the last OFDM symbol position of subframe 0 and subframe 5.
  • the technical problem to be solved by the present invention is to provide a cell search method and device.
  • a cell search method is provided in the embodiment of the present invention, including:
  • the UE receives the synchronization signal and searches for the primary synchronization signal
  • the UE searches for more than one primary synchronization signal correlation peak position and a corresponding primary synchronization sequence in the relevant search window;
  • the UE is based on one of the primary synchronization signal correlation peak positions, according to the double-number correlation peak supported by the UE;
  • the cell initial 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 search of the community is completed.
  • a user equipment is provided in the embodiment of the present invention, including:
  • a receiving module configured to receive a synchronization signal
  • a search module configured to search for a primary synchronization signal, and search for more than one primary synchronization signal correlation peak position and a corresponding primary synchronization sequence in the relevant search window;
  • a detecting module configured to search for a correlation peak of the secondary synchronization signal according to a relative positional relationship between the primary synchronization signal and the secondary synchronization signal specified by a protocol of a duplex mode supported by the user equipment, based on a peak position of one of the primary synchronization signals; After searching for the secondary synchronization signal correlation peak, the cell initial search is completed, and the corresponding secondary synchronization signal sequence is identified; otherwise, the following one primary synchronization signal correlation peak The location is a reference, and the secondary synchronization signal correlation peak is searched according to the relative positional relationship until the cell initial search is completed.
  • a base station is further provided in the embodiment of the present invention, including:
  • a primary synchronization determining module configured to determine more than one primary synchronization signal
  • a sending module configured to send more than one primary synchronization signal.
  • a solution for enabling a UE supporting different duplex modes to perform cell search in the same communication system at the same time is provided, and the cell search solution can be used to speed up the access process of the UE in the communication system.
  • the base station simultaneously transmits the synchronization signals and synchronization sequences of the FDD and TDD modes on the same carrier, the cell search speed of the FDD UE and the TDD UE can be accelerated.
  • FIG. 2 is a schematic diagram of a time-frequency relationship in a basic duplex mode in the background art
  • FIG. 3 is a schematic diagram of a frame structure in an LTE FDD system in the background art
  • FIG. 4 is a schematic diagram of a frame structure in an LTE TDD system in the background art
  • FIG. 5 is a schematic diagram showing the position of a synchronization signal in an LTE FDD system in the background art
  • FIG. 6 is a schematic diagram of a location of a synchronization signal in an LTE TDD system in the background 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 when a cell is searched according to an embodiment of the present invention.
  • FIG. 9 is a schematic flowchart of an implementation process of performing cell search by a UE (FDD UE) supporting an FDD mode and a UE (TDD UE) supporting a TDD 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. 11 is a schematic diagram of resource allocation when performing signal transmission in an FDD/TDD hybrid mode according to an embodiment of the present invention.
  • 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 setting according to an embodiment of the present invention
  • 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. detailed description
  • the inventor of the present invention noticed in the course of the invention that in addition to the difference in frame structure, other differences between the FDD mode and the TDD mode in LTE mainly exist in the difference of the duplex mode itself, that is, the use of consecutive subframes in the FDD mode.
  • the uplink or downlink subframes are not continuous in time, thus deriving some differences in the uplink and downlink scheduling and retransmission timing and control procedures.
  • FDD and TDD are completely The same, this also provides the conditions for further integration of the two, that is, considering a fusion mode of FDD and TDD, supporting both FDD UE and TDD UE access on a pair of TDD carriers with some features, the following is attached
  • the drawings illustrate specific embodiments of the present invention.
  • FIG. 7 is a schematic flowchart of a cell search method implementation process. As shown in FIG. 7, the cell search may include the following steps:
  • Step 701 The UE searches for a primary synchronization signal.
  • Step 702 The UE searches for more than one primary synchronization signal correlation peak position and a corresponding primary synchronization sequence in the related search window.
  • Step 703 If the UE is an FDD UE, the UE searches for a correlation peak of the secondary synchronization signal according to a relative positional relationship between the primary synchronization signal and the secondary synchronization signal specified by the FDD protocol, based on the correlation peak position of one of the primary synchronization signals;
  • the UE is a TDD UE, and the UE searches for a secondary synchronization signal correlation peak according to a relative positional relationship between the primary synchronization signal and the secondary synchronization signal specified by the TDD protocol, based on one of the primary synchronization signal correlation peak positions;
  • Step 704 If the secondary synchronization signal correlation peak is searched, the cell initial 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 step 703 is repeated until the cell initial search is completed.
  • step 703 the FDD UE is based on one of the primary synchronization signal correlation peak positions, Number correlation peak;
  • the TDD UE uses one of the primary synchronization signal correlation peak positions as a reference, according to the TDD protocol, in step 704, if the secondary synchronization signal correlation peak is searched, the cell initial search is completed, and the corresponding secondary synchronization signal sequence is identified; otherwise, A primary synchronization signal correlation peak position is used as a reference, and step 703 is repeated until the cell initial search is completed.
  • the UE supported duplex mode type may be selected from the following duplex mode types: FDD, TDD, half-duplex FDD,
  • the method before the UE searches for the primary synchronization signal, the method further includes:
  • the UE simultaneously receives the synchronization signals specified by the FDD system and the TDD system on the carrier supporting the FDD UE and the TDD UE access.
  • the synchronization signal may include a PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal), and the synchronization sequence may include a PSS sequence and an SSS sequence.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • the base station may not schedule the transmission of the downlink data packet on the time-frequency resources occupied by the PSS and the SSS.
  • Figure 8 is a schematic diagram of the location of the synchronization signal during cell search. As shown in Figure 8, the FDD number is supported at the same time, including PSS and SSS.
  • the PSS sequences of the FDD system and the TDD system may be the same or different; the SSS sequences of the FDD system and the TDD system may be the same or different;
  • the UE implements the search for the primary synchronization signal according to the existing algorithm, and the UE searches for two PSS correlation peaks within 5 ms, identifies the PSS sequences corresponding to the two peaks, and completes downlink OFDM symbol synchronization, slot synchronization, and CP ( Cyclic Prefix, cyclic prefix) length detection;
  • the UE can assume that one of the PSS correlation peak positions and the PSS sequence is correctly searched, and The SSS correlation peak is detected according to the relative OFDM symbol position of the SSS and the PSS synchronization signal in the protocol specification corresponding to the supported duplex mode (FDD or TDD), and the specific detection algorithm can be implemented by using an existing algorithm.
  • the SSS correlation peak cannot be detected at the corresponding location, it indicates that the PSS correlation peak is wrong, or does not match the duplex mode supported by the UE.
  • the UE based on another PSS peak position and the PSS sequence, according to the UE.
  • the base station may not schedule the transmission of the downlink data packet on the time-frequency resources occupied by the two sets of PSS and SSS.
  • FIG. 9 is a schematic diagram of a process for performing cell search by the FDD UE and the TDD UE. As shown in FIG. 9, the following steps may be included:
  • the search process of FDD UE is:
  • Step 901 The UE performs a PSS signal search.
  • Step 902 Search for two PSS related peak positions and corresponding PSS sequences
  • Step 903 Assuming that one of the correlation peak positions is the correct PSS position, the SSS signal is detected according to the position specified by the FDD protocol;
  • Step 904 determining whether the SSS correlation peak is detected and identifying the SSS sequence, if yes, proceeding to step 905, otherwise proceeding to step 903;
  • Step 905 Complete a cell search.
  • TDD UE The search process of TDD UE is:
  • Step 906 The UE performs a PSS signal search.
  • Step 907 Search for two PSS related peak positions and corresponding PSS sequences
  • Step 908 assuming that one of the correlation peak positions is the correct PSS position, and detecting the SSS signal according to the position specified by the TDD protocol;
  • Step 909 determining whether the SSS correlation peak is detected and identifying the SSS sequence, and then transferring Step 901, otherwise proceeds to step 908;
  • Step 910 Complete a cell search.
  • FIG. 10 is a schematic diagram of an implementation process of a signal transmission method. As shown in FIG. 10, the following steps may be included in signal transmission:
  • Step 1001 Determine a duplex mode supported by the UE.
  • Step 1002 The network side performs signal transmission with the UE according to the duplex mode supported by the UE in a time division manner.
  • the method when the time division method is used to perform signal transmission with the UE according to the duplex mode supported by the UE, the method may include
  • Signal transmission is performed on the UE in a duplex mode supported by the UE on at least two non-continuous carriers, and the frequency interval of the carrier wave satisfies the uplink and downlink frequency interval requirements of the FDD.
  • At least two non-continuous carriers can be at least two non-continuous TDD carriers.
  • the following describes the FDD and TDD in the duplex mode as an example.
  • Fig. 11 is a diagram showing the resource allocation when signal transmission is performed in the FDD/TDD hybrid mode, which will be described below with reference to Fig. 11.
  • the frequency intervals of the two carriers are equal to or greater than the uplink and downlink frequency intervals of the FDD.
  • the uplink and downlink frequency interval requirements of the FDD may be defined by the current stage radio frequency indicator, or may be a redefined radio frequency indicator requirement after the device level is improved in a certain stage in the future.
  • the method may further include:
  • One or more TDD carriers for signal transmission with the UE are provided.
  • TDD carriers there may be one or more other TDD carriers in the communication system; and/or there may be one or more other FDD carriers, which may be unidirectional FDD carriers, such as downlink.
  • Wave or uplink carrier can also be FDD carriers in pairs, that is, uplink carrier and downlink carrier.
  • the uplink and downlink subframe allocation modes configured for each pair of non-contiguous TDD carriers may be different.
  • TDD carrier 1 is configured as uplink and downlink allocation mode 2
  • TDD carrier 2 is configured as uplink and downlink allocation mode.
  • the subframes of each pair of TDD carriers may be out of synchronization, and the subframe offset time is an integer multiple of the subframe length.
  • the subframes of two TDD carriers may also be out of sync, but the offset time is an integer multiple of the length of the subframe.
  • each pair of TDD carrier subframes is not synchronized, and the uplink and downlink allocation modes of each pair of TDD carriers are configured the same;
  • each pair of TDD carrier subframes is synchronized, and each pair of TDD carriers is configured differently in uplink and downlink allocation manners;
  • each pair of TDD carrier subframes is not synchronized, and each pair of TDD carriers has different uplink and downlink allocation modes.
  • two TDD carrier subframes are not synchronized, and two TDD carriers are configured to be in the same uplink and downlink allocation manner;
  • two TDD carrier subframes are synchronized, and two TDD carriers are configured into different uplink and downlink allocation modes;
  • two TDD carrier subframes are not synchronized, and two TDD carriers are configured into different uplink and downlink allocation modes.
  • any one of the devices may be scheduled for use by an LTE TDD UE or a single carrier LTE-ATDD UE; To support the use of LTE-ATDD UEs for large bandwidth transmissions;
  • At least two subframe resources with different transmission directions configured on the carrier wave may be simultaneously scheduled for use by the LTE-A TDD UE having the simultaneous transmit and receive capability on the two carriers.
  • any subframe resources on each carrier can be scheduled for use by the TDD UE, for example:
  • the subframe resources on a single carrier can be provided to any TDD UE; the LTE-ATDD UE with large bandwidth transmission is used;
  • the subframe resources with different transmission directions configured on the two carriers can be simultaneously scheduled to have LTE-A TDD with both transmit/transmit capability (one transmit and receive at the same time) on the two carriers.
  • UE use
  • the subframe resources with opposite transmission directions on the two carriers can be simultaneously scheduled for use by the FDD UE.
  • the subframe resources whose opposite transmission directions are configured on the two carriers can be simultaneously scheduled for use by the FDD UE.
  • the DRX state may be configured for the FDD UE to reduce the power consumption of the UE.
  • a user equipment and a 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 no longer Narration.
  • the UE may include: a search module 1201, configured to search for a primary synchronization signal, and search for more than one primary synchronization signal correlation peak position and corresponding in the related search window.
  • Primary synchronization sequence configured to search for a primary synchronization signal, and search for more than one primary synchronization signal correlation peak position and corresponding in the related search window.
  • the detecting module 1202 is configured to: for the FDD UE, the detecting module 1202 of the UE is configured to search for the secondary synchronization according to the relative positional relationship between the primary synchronization signal and the secondary synchronization signal specified by the FDD protocol, based on the correlation peak position of one of the primary synchronization signals.
  • the detection module 1202 of the UE is configured to use one of the primary synchronization signal correlation peak positions as a reference, according to The relative position relationship between the primary synchronization signal and the secondary synchronization signal specified by the TDD protocol searches for the secondary synchronization signal correlation peak; if the secondary synchronization signal correlation peak is searched, the cell initial search is completed, and the corresponding secondary synchronization signal sequence is identified; otherwise, the following one
  • the primary synchronization signal correlation peak position is the reference search secondary synchronization signal correlation peak until the cell initial search is completed.
  • the UE supported duplex mode type may be selected from the following duplex mode types: FDD, TDD, half duplex FDD.
  • the user equipment may further include:
  • the receiving module 1203 is configured to receive the synchronization signal specified by the FDD system and the TDD system simultaneously on the carrier that supports the FDD UE and the TDD UE before the UE searches for the primary synchronization signal.
  • the search module may further be used to search for a synchronization signal including PSS and SSS, including a synchronization sequence of the PSS sequence and the SSS sequence.
  • FIG. 13 is a schematic structural diagram of a base station for use with a user equipment, where the base station is configured to determine a synchronization signal including a PSS and an SSS, including a synchronization sequence of a PSS sequence and an SSS sequence, as shown in the figure, Includes:
  • a primary synchronization determining module 1301, configured to determine more than one primary synchronization signal
  • the sending module 1302 is configured to send the one or more primary synchronization signals.
  • the sending module may be further configured to simultaneously send the synchronization signal specified by the FDD system and the TDD system on the carrier supporting the FDD UE and the TDD UE access.
  • the base station may further include:
  • the time-frequency module 1303 is configured to determine time-frequency resources occupied by the user equipment in the PSS and the SSS.
  • the scheduling module 1304 is configured to not schedule the sending of the downlink data packet on the time-frequency resources occupied by the PSS and the SSS.
  • any of the above-mentioned devices in the implementation may also be considered in combination with the following network side devices and/or user devices, which will be described below.
  • the network side device may include: a duplex determination module 1401, configured to determine a duplex mode supported by the UE;
  • the signal transmission module 1402 is configured to perform signal transmission with the UE according to a duplex mode supported by the UE in a time division manner.
  • the signal transmission module may be further configured to perform UE-supported duplex mode and UE on at least two non-contiguous carriers when performing signal transmission with the UE in a time division manner according to a duplex mode supported by the UE.
  • Signal transmission is performed, and the frequency interval of the carrier wave satisfies the uplink and downlink frequency interval requirements of the FDD.
  • the at least two discontinuous carriers employed by the signal transmission module are at least two non-continuous TDD carriers.
  • the signal transmission module may be further configured to perform signal transmission with the UE on one or more other TDD carriers, and/or to perform signal transmission with the UE in one or more other FDD carriers.
  • the signal transmission module may be further configured to allocate different uplink and downlink subframes of each pair of non-contiguous TDD carrier configurations.
  • the signal transmission module may be further configured to make the subframes of each pair of TDD carriers different, and the subframe offset time is an integer multiple of the subframe length.
  • the signal transmission module may be further configured to make each pair of TDD carrier subframes unsynchronized, and the uplink and downlink allocation manners of each pair of TDD carriers are configured the same; or, each pair of TDD carrier subframes is synchronized, and each pair of TDDs is synchronized.
  • the uplink and downlink allocation modes of the carrier are configured differently.
  • each pair of TDD carrier subframes is not synchronized, and the uplink and downlink allocation modes of each pair of TDD carriers are configured differently.
  • the signal transmission module may be further configured to use any one of the carrier waves to be allocated to the LTE TDD UE or the LTE-A TDD UE of the single carrier; or, configure the same subframe resource in the transmission direction of the at least two carriers simultaneously
  • the scheduling is used by the LTE-A TDD UE that needs to support the large bandwidth transmission; or, the subframe resources with different transmission directions configured on the at least two carriers are simultaneously scheduled to the LTE with the simultaneous receiving and transmitting capability on the two carriers. Used by ATDD UE,
  • the signal transmission module may be further configured to simultaneously schedule the subframe resources with opposite transmission directions on the two carriers to be used by the FDD UE.
  • the signal transmission module can be further used to configure the same transmission direction on the two carriers.
  • the DRX state is configured for the FDD UE.
  • FIG. 15 is a schematic structural diagram of a user equipment. As shown in the figure, the UE may include:
  • the duplex determination module 1501 is configured to determine a duplex mode supported by the UE;
  • the signal transmission module 1502 is configured to perform signal transmission in the time division manner according to the duplex mode supported by the UE and the network side.
  • the signal transmission module may be further configured to perform signal transmission on the at least two non-continuous carriers according to the FDD duplex mode supported by the UE, where the frequency interval of the carrier satisfies the uplink and downlink frequency interval requirements of the FDD. Signal transmission on the network side of any one or two uplinks in accordance with the TDD duplex mode supported by the UE.
  • the at least two discontinuous carriers employed by the signal transmission module are at least two non-continuous TDD carriers.
  • the signal transmission module can be further configured to perform signal transmission on one or more other TDD carriers and the network side, and/or to perform signal transmission on one or more other FDD carriers and the network side.
  • a scheme for enabling a FDD UE and a TDD UE to perform cell search in the same communication system at the same time is provided.
  • the cell search scheme can accelerate the access process of the UE in the communication system.
  • the base station simultaneously transmits the synchronization signals and synchronization sequences of the FDD and TDD modes on the same carrier wave, the small-area search speed of the FDD UE and the TDD UE can be accelerated.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can take the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.
  • the present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), 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 may 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 such that the flow diagram is a process or a flow and/or block diagram of a block or A device that has multiple functions specified in the box.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

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Abstract

La présente invention concerne un procédé et un dispositif de recherche de cellule. Ledit procédé comprend les étapes suivantes : un équipement utilisateur (UE) recherche un signal de synchronisation primaire; l'UE a recherché une ou plusieurs séquences de positions de valeurs de crête de corrélation de signal de synchronisation primaire et de synchronisations primaires correspondantes, au sein d'une fenêtre de recherche de corrélation; en ce qui concerne un UE FDD, ledit UE FDD prend une des valeurs de crête de corrélation de signal de synchronisation primaire en tant que repère, et recherche une valeur de crête de corrélation de signal de synchronisation secondaire selon la relation de position relative, entre le signal de synchronisation primaire et le signal de synchronisation secondaire régulés par le protocole FDD; en ce qui concerne un UE TDD, le UE TDD prend une des valeurs de crête de corrélation de signal de synchronisation primaire en tant que repère, et recherche une valeur de crête de corrélation de signal de synchronisation secondaire selon la relation de position relative entre le signal de synchronisation primaire et le signal de synchronisation secondaire régulés par le protocole FDD; si la valeur de crête de corrélation de signal de synchronisation secondaire est recherchée, alors la recherche de cellule initiale est finie, et une séquence de signaux de synchronisation secondaires correspondante est reconnue; autrement, la position de valeur de crête de corrélation de signal de synchronisation primaire suivante est utilisée en tant que repère pour rechercher une valeur de crête de corrélation de signal de synchronisation secondaire, jusqu'à ce que la recherche de cellule initiale soit finie.
PCT/CN2010/001728 2009-11-10 2010-10-29 Procédé et dispositif de recherche de cellule WO2011057472A1 (fr)

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