WO2011057472A1 - 一种小区搜索方法及设备 - Google Patents
一种小区搜索方法及设备 Download PDFInfo
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- 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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- synchronization signal
- tdd
- fdd
- primary synchronization
- correlation peak
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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
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- 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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Description
一种小区搜索方法及设备 本申诸要求在 2009 年 11 月 10 日提交中国专利局、 申请号为 200910237191.2发明名称为 "一种小区搜索方法及设备" 的中国专利申请的 优先权, 其全部内容通过引用结合在本申谛中。 技术领域
本发明涉及无线通信技术, 特别涉及一种小区搜索方法及设备。 背景抹术
对于蜂窝移动通信***来说, 双工方式就是上下行链路的复用方式; 而 对移动通信设备来说(基站或 UE ), 双工方式就是发送和接收链路的复用方 式。 TDEX Time Division Duplex,时分双工)和 FDD( Frequency Division Duplex, 频分双工)是无线通信传输中两种基本的双工方式, 在 LTE ( Long Term Evolution, 长期演进) ***中同时支持 TDD模式和 FDD模式。 在 TDD模式 下, 上下行链路使用不同的时间间隔进行上下行信号的传输; 而在 FDD模式 下, 上下行链路使用不同的工作频带进行上下行信号的传输。 双工方式可以 参考图 1和图 2, 图 1为双工方式的原理示意图, 图 2为基本双工方式下时频 关系的示意图, 图 2中的 T表示时间, R表示频率。
对于蜂窝***釆用的基本的双工方式来说: 在 TDD模式下, 上下行链路 使用同一个工作频带、 在不同的时间间隔上进行上下行信号的传输, 上下行 之间有 GP ( Guard Period, 保护间隔); 而在 FDD模式下, 上下行链路使用不 同的工作频带, 可以在同一个时刻在不同的频率载波上进行上下行信号的传 输, 上下行之间有保护带宽(Guard Band )。
在基本的 TDD蜂窝移动通信***中, 移动通信设备 (包括基站或 UE ) 也都是以 TDD方式工作的, 设备中需要有收发转换开关; 在基本的 FDD蜂 窝移动通信***中, 移动通信设备 (包括基站或 UE )也都是以 FDD方式工
作的, 设备中需要有收发双工滤波器。
在 LTE***中, FDD模式和 TDD模式釆用不同的帧结构, 具体如下描 述:
图 3为 LTE FDD***的帧结构的示意图, 如图 3所示, 在 LTE FDD系 统的帧结构中, 一个无线帧的长度为 lOms, 含有 10个子帧, 每个子帧有 2 个 slot (时隙), 每个 slot是 0,5ms, Ts是采样间隔。
LTE TDD***的帧结构稍复杂一些,图 4为 LTE TDD***的帧结构的示 意图, 如图 4所示, 一个无线帧也为 10ms, 可以包含 1个或 2个特殊子帧, 所述特殊子帧分为 3个时隙: DwPTS ( Downlink Pilot Time Slot, 下行导频时 隙)、 GP和 UpPTS ( Uplink Pilot Time slot, 上行导频时隙)。 子帧 0和子帧 5 以及 DwPTS总是用作下行传输,其他子帧可以依据需要用作上行传输或者下 行传输。
特殊子帧的三个时隙的长度配置如表 1所示, 表 1 中给出了特殊子帧区 域的所有配置方式。
表 1 LTE TDD***中特殊子帧的配置:
对于 LTE TDD***中帧的结构, 另外一项重要的配置是上下行子帧的配
置, 具体配置方式如下表 2所示, 表 2中列出 7种配置, D表示用作下行传 输, U表示用作上行传输, S表示该子帧是特殊子帧, 包含 DwPTS、 GP和 UpPTS三部分。
表 2 LTE TDD***中上下行子帧的配置
DwPTS域可以传输 PCFICH ( Physical Control Format Indicator Channel, 物理控制格式指示信道), PDCCH ( hysical downlink control channel, 物理下 行控制信道), PKCH ( physical HARQ Indicator Channel, 物理 HARQ就答指 示信道), PDSCH ( Physical Downlink Shared Channel, 物理下行链路共享信 道) 以及 PSS ( Primary Synchronization Signal, 主同步信号), UpPTS域可以 传输 PRACH( Physical Random Access Channel,物理随机接入信道 )以及 SRS ( Sounding Reference Signal,信道探测参考信号),不能传输 PUSCH( Physical Uplink Shared Channel, 物理上行链路共享信道)及 PUCCH ( Physical Uplink Control Channel, 物理上行控制信道)。
小区搜索的作用主要有以下几点:
1、 UE通过小区搜索过程完成下行时间和频率的同步, 并识别小区 id。
2、 完成小区初搜后, UE接收基站发出的广^ ί言息, 以获取***信息。
3、 小区搜索是 UE接入***的第一步, 关系到 UE能否快速, 准确地接 入***。
小区搜索的基本原理主要有以下几点:
1、 UE通过检测基站发出的预定义的同步信号, 完成下行的时间和频率
同步, 并识别出小区的 id。
2、 所述同步信号是基站和 UE共同知晓的序列, 不同的序列表征不同的 小区 id号。
3、 UE在完成下行同步后, 接收基站发出的广播信息, 解析出***信息, 根据***信息完成后续的驻留或者小区重选操作。
在 LTE***中小区搜索的基本流程设计主要为:
1、 UE开机后开始在以 ΙΟΟ Ηζ为间隔的频栅上进行扫描。
2、 在每个频点上进行主同步信道的检测。
1 )使用 3个预定义的主同步序列与接收到的时域信号(至少 5ms的时域 采样点)做相关, 取峰值进行序列判断, 得到时咪同步点, 完成时隙同步并 获取参数^
2 )完成时隙同步后, 进行 CP类型盲检测, 确定 CP类型。
3 )按照辅同步信道与主同步信道的时序关系, 选取辅同步信道的信号进 行辅同步序列的检测, 得到两个 m序列的循环移位值。 根据循环移位值的关 系, 完成半帧同步并获得参数 ^έ1 ,
3、 完成同步检测后, 通过组合两个参数 确定小区 id, 然后根据 小区 id号确定下行导频并对广播信道进行信道估计, 完成数据的解调, 读取 广播信息。
图 5为 LTE FDD***中同步信号的位置示意图, 如图所示, 在 LTE*** 中, FDD模式和 TDD模式下的主辅同步信号的产生方式是完全一样的, 由于 帧结构的差异, FDD模式和 TDD模式下的主同步信号和辅同步信号的发送位 置存在差异如下:
LTE FDD***的主同步信号 PSS位于子帧 0和子帧 5的最后一个 OFDM ( Orthogonal Frequency Division Multiplex, 正交频分复用)符号位置处, 辅 同步信号 SSS位于子帧 0和子帧 5的倒数第 2个 OFDM符号位置处。
图 6 为 LTE TDD***中同步信号的位置示意图,如图 6所示, LTE TDD
***的主同步信号 PSS位于子帧 1和子帧 6的 DwPTS的第三个 OFDM符号 位置处,辅同步信号 S-SCH位于子帧 0和子帧 5的最后一个 OFDM符号位置 处。
现有技术的不足在于: 目前还没有使得支持 FDD模式的 UE ( FDD UE ) 与支持 TDD模式的 UE ( TDD UE )能够同时在同一通信***中进行小区搜索 的技术方案。 发明内容
本发明所要解决的技术问题在于提供一种小区搜索方法及设备。
本发明实施例中提供了一种小区搜索方法, 包括:
UE接收同步信号并搜索主同步信号;
UE在相关搜索窗内搜索到一个以上的主同步信号相关峰值位置和相应 的主同步序列;
UE以其中一个主同步信号相关峰值位置为基准, 按照该 UE所支持的双 号相关峰值;
若搜索到辅同步信号相关峰值, 则完成小区初搜, 并识别出相应的辅同 步信号序列; 否则以下一个主同步信号相关峰值位置为基准, 按照所述相对 位置关系继续搜索辅同步信号相关峰值, 直至完成小区初搜。
本发明实施例中提供了一种用户设备, 包括:
接收模块, 用于接收同步信号;
搜索模块, 用于搜索主同步信号, 在相关搜索窗内搜索到一个以上的主 同步信号相关峰值位置和相应的主同步序列;
检测模块, 用于以其中一个主同步信号相关峰值位置为基准, 按照本用 户设备所支持的双工模式的协议规定的主同步信号和辅同步信号的相对位置 关系搜索辅同步信号相关峰值; 若搜索到辅同步信号相关峰值, 则完成小区 初搜, 并识别出相应的辅同步信号序列; 否则以下一个主同步信号相关峰值
位置为基准, 按照所述相对位置关系搜索辅同步信号相关峰值, 直至完成小 区初搜。
本发明实施例中还提供了一种基站, 包括:
主同步确定模块, 用于确定一个以上的主同步信号;
发送模块, 用于发送一个以上的主同步信号。
本发明有益效果如下:
由上述可知, 本发明实施例中提供了一种使得支持不同双工模式的 UE 能够同时在同一通信***中进行小区搜索的方案, 利用该小区搜索方案能够 加快 UE在通信***中的接入过程。 特别是当基站在同一载波上同时发送 FDD和 TDD两种模式的同步信号和同步序列时, 能够加快 FDD UE和 TDD UE的小区搜索速度。 附图说明
图 1 ( a )、 (b )、 ( c )为背景技术中双工方式的原理示意图;
图 2为背景技术中基本双工方式下时频关系示意图;
图 3为背景技术中 LTE FDD***中帧结构的示意图;
图 4为背景技术中 LTE TDD***中帧结构的示意图;
图 5为背景技术中 LTE FDD***中同步信号的位置的示意图;
图 6 为背景技术中 LTE TDD***中同步信号的位置的示意图; 图 7为本发明实施例中小区搜索方法的实施流程示意图;
图 8为本发明实施例中小区搜索时的同步信号位置示意图;
图 9为本发明实施例中支持 FDD模式的 UE ( FDD UE )和支持 TDD模 式的 UE ( TDD UE )进行小区搜索的实施流程示意图;
图 10为本发明实施例中信号传输方法的实施流程示意图;
图 11为本发明实施例中以 FDD/TDD混合模式进行信号传输时的资源分 配示意图;
图 12为本发明实施例中用户设备的结构示意图;
图 13为本发明实施例中配合用户设^吏用的基站的结构示意图;
图 14为本发明实施例中网络侧设备的结构示意图;
图 15为本发明实施例中用户设备的结构示意图。 具体实施方式
本发明的发明人在发明过程中注意到:除了帧结构的差异外, LTE中 FDD 模式和 TDD模式的其他差异主要存在于双工方式本身的差异上, 即在 FDD 模式下使用连续的子帧工作, 而在 TDD模式下上行或下行子帧在时间上不连 续, 由此派生了上下行调度和重传时序和控制过程上的一些差异, 然而, 在 其他基本传输技术上, FDD和 TDD完全相同,这也为两者的进一步融合提供 了条件,即,考虑一种 FDD和 TDD的融合方式,在一对具有一些特征的 TDD 栽波上同时支持 FDD UE和 TDD UE接入, 下面结合附图对本发明的具体实 施方式进行说明,
图 7为小区搜索方法实施流程示意图, 如图 7所示, 在小区搜索时可以 包括如下步骤:
步骤 701、 UE搜索主同步信号;
步骤 702、 UE在相关搜索窗内搜索到一个以上的主同步信号相关峰值位 置和相应的主同步序列;
步骤 703、 若所述 UE为 FDD UE, 则该 UE以其中一个主同步信号相关 峰值位置为基准, 按照 FDD协议规定的主同步信号和辅同步信号的相对位置 关系搜索辅同步信号相关峰值; 若所述 UE为 TDD UE, 则该 UE以其中一个 主同步信号相关峰值位置为基准, 按照 TDD协议规定的主同步信号和辅同步 信号的相对位置关系搜索辅同步信号相关峰值;
步骤 704、 若搜索到辅同步信号相关峰值, 则完成小区初搜, 并识别出相 应的辅同步信号序列; 否则以下一个主同步信号相关峰值位置为基准, 重复 步骤 703, 直至完成小区初搜。
即,在步骤 703中, FDD UE以其中一个主同步信号相关峰值位置为基准,
号相关峰值;
TDD UE以其中一个主同步信号相关峰值位置为基准, 按照 TDD协议规 在步骤 704 中, 若搜索到辅同步信号相关峰值, 则完成小区初搜, 并识 别出相应的辅同步信号序列; 否则以下一个主同步信号相关峰值位置为基准, 重复步骤 703, 直至完成小区初搜。
实施中, UE 支持的双工模式类型可以选自以下双工模式类型: FDD、 TDD, 半双工 FDD,
实施中, 在 UE搜索主同步信号前, 还可以进一步包括:
UE在支持 FDD UE和 TDD UE接入的栽波上同时接收 FDD***和 TDD ***规定的同步信号。
实施中, 同步信号可以包括 PSS ( Primary Synchronization Signal, 主同步 信号)和 SSS ( Secondary Synchronization Signal, 辅同步信号), 同步序列可 以包括 PSS序列和 SSS序列 .
实施中, 基站可以在 PSS和 SSS所占用的时频资源上不调度下行数据包 的发送。
下面进一步进行说明。
图 8为小区搜索时的同步信号位置示意图,如图 8所示,在同时支持 FDD 号, 包括 PSS和 SSS。
其中, FDD***和 TDD***的 PSS序列可以相同或者不同; FDD*** 和 TDD***的 SSS序列可以相同或者不同;
实施中, UE按照现有算法实现搜索主同步信号, UE在 5ms内会搜索到 两个 PSS相关峰值, 识别出两个峰值对应的 PSS序列, 并完成下行 OFDM符 号同步、 时隙同步和 CP ( Cyclic Prefix , 循环前缀)长度检测;
UE可以假设其中一个 PSS相关峰值位置和 PSS序列是正确搜索的, 并
按照其支持的双工方式(FDD或 TDD)对应的协议规范中 SSS与 PSS同步信 号的相对 OFDM符号位置检测 SSS相关峰值, 具体的检测算法可以利用现有 算法实现。
若在对应的位置无法检测到 SSS相关峰值, 则说明该 PSS相关峰值是错 误的, 或者说与该 UE支持的双工方式不符, 此时以另一个 PSS峰值位置和 PSS序列为基准, 按照 UE支持的双工方式(FDD或 TDD )对应的协议规范 中 SSS与 PSS同步信号的相对 OFDM符号位置检测 SSS相关峰值;相反,若 在对应的位置检测到 SSS相关峰值,则说明该 PSS相关峰值是正确的,则 UE 成功地完成了 PSS和 SSS的检测, 获得了物理层 Cell ID (小区标识);
实施中, 基站还可以在如上两套 PSS和 SSS所占用的时频资源上不调度 下行数据包的发送。
图 9为 FDD UE和 TDD UE进行小区搜索的实施流程示意图, 如图 9所 示, 可以包括如下步骤:
FDD UE的搜索过程为:
步骤 901、 UE进行 PSS信号搜索;
步骤 902、 搜索到 2个 PSS相关峰值位置和相应的 PSS序列;
步骤 903、 假设其中一个相关峰值位置是正确的 PSS位置, 按照 FDD协 议规定的位置检测 SSS信号;
步骤 904、 判断是否检测到 SSS相关峰值并识别出 SSS序列, 是则转入 步骤 905, 否则转入步骤 903;
步骤 905、 完成小区搜索。
TDD UE的搜索过程为:
步骤 906、 UE进行 PSS信号搜索;
步骤 907、 搜索到 2个 PSS相关峰值位置和相应的 PSS序列;
步骤 908、 假设其中一个相关峰值位置是正确的 PSS位置, 按照 TDD协 议规定的位置检测 SSS信号;
步骤 909、 判断是否检测到 SSS相关峰值并识别出 SSS序列, 是则转入
步驟 901, 否则转入步骤 908;
步骤 910、 完成小区搜索。
为了更好地理解本发明提供的技术方案可以结合的通信方式, 下面对可 以采用的一种能提供多双工模式类型通信服务的通信方案进行说明。
图 10为信号传输方法实施流程示意图, 如图 10所示, 在信号传输时可 以包括如下步骤:
步骤 1001、 确定 UE支持的双工模式;
步骤 1002、 网络侧采用时分的方式按 UE所支持的双工模式与 UE进行 信号传输。
实施中, 在采用时分的方式按 UE所支持的双工模式与 UE进行信号传输 时, 可以包括;
在至少两个非连续的栽波上按 UE所支持的双工模式与 UE进行信号传 输, 所述栽波的频率间隔满足 FDD的上下行频率间隔要求。
实施中, 至少两个非连续的栽波可以是至少两个非连续的 TDD栽波。 下面以双工模式分别为 FDD和 TDD为例进行说明。
图 11为在 FDD/TDD混合模式下进行信号传输时的资源分配示意图, 下 面结合图 11进行说明。
实施中, 在通信***中至少有两个非连续的 TDD载波, 如图 11 中所示 的 TDD载波 1和 TDD载波 2, 且这两个栽波的频率间隔满足或大于 FDD的 上下行频率间隔要求, 具体实施中, 该 FDD上下行频率间隔要求可以是目前 阶段射频指标所定义的, 也可以是未来某个阶段器件水平提高之后重新定义 的射频指标要求。
进一步地, 还可以包括:
一个或多个与 UE进行信号传输的 TDD栽波;
和 /或, 一个或多个与 UE进行信号传输的 FDD载波。
即, 在通信***中还可以有一个或多个其他的 TDD栽波; 和 /或, 还可 以有一个或多个其他的 FDD栽波, 可以是单方向的 FDD栽波, 例如下行载
波或上行载波; 也可以是成对出现的 FDD栽波, 即上行栽波和下行载波。 实施中, 为每一对非连续的 TDD栽波所配置的上下行子帧分配方式可以 不同。
例如, 两个非连续的 TDD栽波可以配置成不同的上下行子帧分配方式, 如图 11所示, TDD栽波 1配置为上下行分配方式 2, TDD载波 2配置为上下 行分配方式 0。
实施中, 每一对 TDD栽波的子帧可以不同步, 子帧偏差时间为子帧长度 的整数倍。
例如, 两个 TDD栽波的子帧也可以不同步, 但偏差时间为子帧长度的整 数倍。
实施中, 每一对 TDD栽波子帧不同步, 每一对 TDD栽波的上下行分配 方式配置相同;
或, 每一对 TDD载波子帧同步, 每一对 TDD栽波的上下行分配方式配 置不同;
或, 每一对 TDD栽波子帧不同步, 每一对 TDD栽波的上下行分配方式 配置不同。
例如, 图 11 中的两个 TDD栽波具有如下的可能性时, 在本发明实施例 提供的方案中也是可以实现的:
A )、 两个 TDD载波子帧不同步, 同时两个 TDD栽波配置成相同的上下 行分配方式;
B )、 两个 TDD栽波子帧同步, 同时两个 TDD栽波配置成不同的上下行 分配方式;
C )、 两个 TDD载波子帧不同步, 同时两个 TDD载波配置成不同的上下 行分配方式.
实施中, 可以将其中任意一个栽波调度给 LTE TDD UE 或单载波的 LTE-ATDD UE使用;
要支持大带宽传输的 LTE-ATDD UE使用;
或, 可以将至少两个栽波上传输方向配置不同的子帧资源同时调度给具 有在两个载波上具有同时收与发能力的 LTE-A TDD UE使用。
对于上述的两个 TDD栽波来说, 每个栽波上的的任意子帧资源都可以调 度给 TDD UE使用, 例如:
A ) 、 单一栽波上的子帧资源可以提供给任意的 TDD UE使用; 大带宽传输的 LTE-ATDD UE使用;
C )、 两个栽波上传输方向配置不同的子帧资源可以同时调度给具有在两 个载波上同时具有收 /发能力(一个栽波收, 同时在另一个载波发)的 LTE-A TDD UE使用.
实施中, 还可以将两个栽波上传输方向配置相反的子帧资源同时调度给 FDD UE使用。
例如, 对于上述的两个 TDD栽波, 两个栽波上传输方向配置相反的子帧 资源可以同时调度给 FDD UE使用。
实施中, 两个栽波上传输方向配置相同的子帧资源时, 可以为 FDD UE 配置 DRX状态, 用以降低 UE的功耗。
基于同一发明构思, 本发明实施例中还提供了一种用户设备、 及基站, 由于这些设备解决问题的原理与小区搜索方法相似, 因此这些设备的实施可 以参见方法的实施, 重复之处不再贽述。
图 12为用户设备的结构示意图, 如图 12所示, UE中可以包括: 搜索模块 1201, 用于搜索主同步信号, 在相关搜索窗内搜索到一个以上 的主同步信号相关峰值位置和相应的主同步序列;
检测模块 1202, 对与 FDD UE而言, 该 UE的检测模块 1202用于以其中 一个主同步信号相关峰值位置为基准, 按照 FDD协议规定的主同步信号和辅 同步信号的相对位置关系搜索辅同步信号相关峰值; 对与 TDD UE而言, 该 UE的检测模块 1202用于以其中一个主同步信号相关峰值位置为基准, 按照
TDD协议规定的主同步信号和辅同步信号的相对位置关系搜索辅同步信号相 关峰值; 若搜索到辅同步信号相关峰值, 则完成小区初搜, 并识别出相应的 辅同步信号序列; 否则以下一个主同步信号相关峰值位置为基准搜索辅同步 信号相关峰值, 直至完成小区初搜。
实施中, UE 支持的双工模式类型可以选自以下双工模式类型: FDD、 TDD、 半双工 FDD。
实施中, 用户设备中还可以进一步包括:
接收模块 1203, 用于在 UE搜索主同步信号前, 在支持 FDD UE和 TDD UE接入的栽波上同时接收 FDD***和 TDD***规定的同步信号。
实施中, 搜索模块还可以进一步用于搜索包括 PSS和 SSS的同步信号, 包括 PSS序列和 SSS序列的同步序列。
图 13 为配合用户设^吏用的基站的结构示意图, 该基站用于确定包括 PSS和 SSS的同步信号, 包括 PSS序列和 SSS序列的同步序列, 如图所示, 则此时的基站中可以包括:
主同步确定模块 1301, 用于确定一个以上的主同步信号;
发送模块 1302, 用于发送所述一个以上的主同步信号。
实施中, 发送模块还可以进一步用于在支持 FDD UE和 TDD UE接入的 载波上同时发送 FDD***和 TDD***规定的同步信号.
基站中还可以进一步包括:
时频模块 1303, 用于确定用户设备在 PSS和 SSS所占用的时频资源; 调度模块 1304, 用于在 PSS和 SSS所占用的时频资源上不调度下行数据 包的发送。
为了更好地采用本发明实施例提供的技术方案, 在实施中上面所述的任 意设备还可以考虑与下面的网络侧设备和 /或用户设备相结合, 下面进行说 明。
图 14为网络侧设备结构示意图, 如图所示, 网络侧设备中可以包括: 双工确定模块 1401, 用于确定 UE支持的双工模式;
信号传输模块 1402, 用于采用时分的方式按 UE所支持的双工模式与 UE 进行信号传输。
实施中, 信号传输模块可以进一步用于在采用时分的方式按 UE所支持 的双工模式与 UE进行信号传输时, 在至少两个非连续的栽波上按 UE所支持 的双工模式与 UE进行信号传输, 所述栽波的频率间隔满足 FDD的上下行频 率间隔要求。
实施中, 信号传输模块采用的所述至少两个非连续的栽波是至少两个非 连续的 TDD栽波。
实施中, 信号传输模块可以进一步用于在一个或多个其他的 TDD载波与 UE进行信号传输, 和 /或, 在一个或多个其他的 FDD栽波与 UE进行信号传 输。
实施中, 信号传输模块可以进一步用于使每一对非连续的 TDD载波配置 的上下行子帧分配方式不同。
实施中, 信号传输模块可以进一步用于使每一对 TDD 栽波的子帧不同 步, 子帧偏差时间为子帧长度的整数倍。
实施中, 信号传输模块可以进一步用于使每一对 TDD栽波子帧不同步, 每一对 TDD栽波的上下行分配方式配置相同; 或, 每一对 TDD栽波子帧同 步, 每一对 TDD载波的上下行分配方式配置不同; 或, 每一对 TDD载波子 帧不同步, 每一对 TDD载波的上下行分配方式配置不同。
实施中, 信号传输模块可以进一步用于将其中任意一个栽波调度给 LTE TDD UE或单载波的 LTE-A TDD UE使用; 或, 将至少两个栽波上传输方向 配置相同的子帧资源同时调度给需要支持大带宽传输的 LTE-A TDD UE使 用; 或, 将至少两个栽波上传输方向配置不同的子帧资源同时调度给具有在 两个载波上具有同时收与发能力的 LTE-ATDD UE使用,
实施中, 信号传输模块可以进一步用于将两个栽波上传输方向配置相反 的子帧资源同时调度给 FDD UE使用。
实施中, 信号传输模块可以进一步用于在两个栽波上传输方向配置相同
的子帧资源时, 为 FDD UE配置 DRX状态。
图 15为用户设备结构示意图, 如图所示, UE中可以包括:
双工确定模块 1501, 用于确定 UE支持的双工模式;
信号传偷模块 1502, 用于采用时分的方式按 UE所支持的双工模式与网 络侧进行信号传输。
实施中, 信号传输模块可以进一步用于在至少两个非连续的栽波上按 UE所支持的 FDD双工模式与网络侧进行信号传输, 所述载波的频率间隔满 足 FDD的上下行频率间隔要求; 在任意一个或两个上栽波上按 UE所支持的 TDD双工模式与网络侧进行信号传输。
实施中, 信号传输模块采用的所述至少两个非连续的栽波是至少两个非 连续的 TDD栽波。
实施中, 信号传输模块可以进一步用于在一个或多个其他的 TDD栽波与 网络侧进行信号传输, 和 /或, 在一个或多个其他的 FDD 栽波与网络侧进行 信号传输。
为了描述的方便, 以上所述装置的各部分以功能分为各种模块或单元分 别描迷。 当然, 在实施本发明时可以把各模块或单元的功能在同一个或多个 软件或硬件中实现,
由上述可知, 本发明实施例中提供了一种使得 FDD UE和 TDD UE能够 同时在同一通信***中进行小区搜索的方案, 采用该小区搜索方案能够加快 UE在通信***中的接入过程。 特别是在基站在同一栽波上同时发送 FDD和 TDD两种模式的同步信号和同步序列时, 能够加快 FDD UE和 TDD UE的小 区搜索速度。
本领域内的技术人员应明白, 本发明的实施例可提供为方法、 ***、 或 计算机程序产品。 因此, 本发明可采用完全硬件实施例、 完全软件实施例、 或结合软件和硬件方面的实施例的形式。 而且, 本发明可采用在一个或多个 其中包含有计算机可用程序代码的计算机可用存储介盾 (包括但不限于磁盘 存储器、 CD-ROM、 光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、 设备(***)、 和计算机程序产 品的流程图和 /或方框图来描述的。 应理解可由计算机程序指令实现流程图 和 /或方框图中的每一流程和 /或方框、 以及流程图和 /或方框图中的流程 和 /或方框的结合。 可提供这些计算机程序指令到通用计算机、 专用计算机、 嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器, 使得通 程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的 装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设 备以特定方式工作的计算机可读存储器中, 使得存储在该计算机可读存储器 中的指令产生包括指令装置的制造品, 该指令装置实现在流程图一个流程或 多个流程和 /或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装栽到计算机或其他可编程数据处理设备上, 使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的 处理, 从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图 一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的步 尽管已描述了本发明的优选实施例, 但本领域内的技术人员一旦得知了 基本创造性概念, 则可对这些实施例作出另外的变更和修改。 所以, 所附权 显然, 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本 发明的实质范围。 这样, 倘若本发明的这些修改和变型属于本发明权利要求 及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。
Claims
1、 一种小区搜索方法, 其特征在于, 包括:
用户设备 UE接收同步信号并搜索主同步信号;
所述 UE在相关搜索窗内搜索到一个以上的主同步信号相关峰值位置和 相应的主同步序列;
所述 UE以其中一个主同步信号相关峰值位置为基准,按照该 UE所支持 步信号相关峰值;
若搜索到辅同步信号相关峰值, 则完成小区初搜, 并识别出相应的辅同 步信号序列; 否则以下一个主同步信号相关峰值为基准, 按照所述相对位置 关系继续搜索辅同步信号相关峰值, 直至完成小区初搜。
2、 如权利要求 1所述的方法, 其特征在于, 所述 UE支持的双工模式类 型选自以下双工模式类型: FDD、 TDD、 半双工 FDD。
3、如权利要求 2所述的方法, 其特征在于, 所述 UE在支持具有 FDD双 工模式的 UE和具有 TDD双工模式的 UE接入的栽波上同时接收 FDD***和 TDD***规定的同步信号,
4、 如权利要求 1至 3中的任一项所述的方法, 其特征在于, 所迷同步信 号包括主同步信号 PSS和辅同步信号 SSS。
5、 如权利要求 1所述的方法, 其特征在于, 基站在同步信号所占用的时 频资源上不调度下行数据包的发送。
6、 一种用户设备, 其特征在于, 包括:
接收模块, 用于接收同步信号;
搜索模块, 用于搜索主同步信号; 在相关搜索窗内搜索到一个以上的主 同步信号相关峰值位置和相应的主同步序列;
检测模块, 用于以其中一个主同步信号相关峰值位置为基准, 按照本用 户设备所支持的双工模式的协议规定的主同步信号和辅同步信号的相对位置 关系搜索辅同步信号相关峰值; 若搜索到辅同步信号相关峰值, 则完成小区 初搜, 并识别出相应的辅同步信号序列; 否则以下一个主同步信号相关峰值 位置为基准, 按照所述相对位置关系继续搜索辅同步信号相关峰值, 直至完 成小区初搜。
7、 如权利要求 6所述的用户设备, 其特征在于, 所述 UE支持的双工模 式类型选自以下双工模式类型: FDD、 TDD、 半双工 FDD。
8、 如权利要求 7所述的用户设备, 其特征在于, 所述接收模块用于在支 持具有 FDD双工模式的 UE和具有 TDD双工模式的 UE接入的栽波上同时接 收 FDD***和 TDD***规定的同步信号 .
9、 如权利要求 6至 8中的任一项所述的用户设备, 其特征在于, 所述接 收模块用于接收包括 PSS和 SSS的同步信号,
10、 一种基站, 其特征在于, 包括:
主同步确定模块, 用于确定一个以上的主同步信号;
发送模块, 用于发送一个以上的主同步信号.
11、 如权利要求 10所述的基站, 其特征在于, 所述发送模块用于在支持 具有 FDD双工模式的 UE和具有 TDD双工模式的 UE接入的栽波上同时发送 FDD***和 TDD***规定的同步信号。
12、 如权利要求 11所述的基站, 其特征在于, 所迷发送模块用于在所述 载波上发送 FDD***规定的主同步信号 PSS和辅同步信号 SSS以及 TDD系 统规定的主同步信号 PSS和辅同步信号 SSS。
13、 如权利要求 12所述的基站, 其特征在于, 进一步包括:
时频确定模块, 用于确定所迷 PSS和 SSS所占用的时频资源;
调度模块, 用于在 PSS和 SSS所占用的时频资源上不调度下行数据包的 发送。
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