WO2014079068A1 - 同步信号的发送、接收方法和装置 - Google Patents

同步信号的发送、接收方法和装置 Download PDF

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Publication number
WO2014079068A1
WO2014079068A1 PCT/CN2012/085292 CN2012085292W WO2014079068A1 WO 2014079068 A1 WO2014079068 A1 WO 2014079068A1 CN 2012085292 W CN2012085292 W CN 2012085292W WO 2014079068 A1 WO2014079068 A1 WO 2014079068A1
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WIPO (PCT)
Prior art keywords
synchronization signal
synchronization
transmission
group
information
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PCT/CN2012/085292
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English (en)
French (fr)
Inventor
官磊
万蕾
马莎
薛丽霞
李强
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2012/085292 priority Critical patent/WO2014079068A1/zh
Priority to CN201280020889.9A priority patent/CN104081839A/zh
Publication of WO2014079068A1 publication Critical patent/WO2014079068A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for transmitting and receiving a synchronization signal. Background technique
  • LTE Long Term Evolution
  • User Equipment User Equipment
  • the identification of the cell means that the UE performs synchronization with the cell by detecting the synchronization channel, acquires the physical cell identity of the cell, and performs operations such as measurement on the cell.
  • the transmission period of the PSS and the SSS is usually 5 subframes, and the time domain location of the base station transmitting the PSS and the SSS is fixed.
  • the PSS is located in the first of a radio frame. And the last symbol of the first slot of the sixth subframe, the SSS is located in the second truncated symbol of the first slot of the first and sixth subframes of a radio frame; for time division duplex TDD (Time Division Duplexing system, the PSS is located in the third symbol of the first slot of the 2nd and 7th subframes of a radio frame, and the SSS is located at the end of the second slot of the 1st and 6th subframes of a radio frame. a symbol.
  • FDD Frequency Division Duplexing
  • the base stations include a macro base station and a micro base station. Due to the dense deployment, the interference between the base stations is very serious, especially between the micro base stations. Therefore, the interference will cause the UE to detect the synchronization channel, and the UE may not be able to detect the synchronization channel of each cell normally and cannot identify the cell.
  • a main object of the embodiments of the present invention is to provide a method and an apparatus for transmitting and receiving a synchronization signal, which can effectively improve the detection performance of a UE on a synchronization channel.
  • a method for sending a synchronization signal including:
  • the first group of synchronization signals including at least one synchronization signal
  • a method for receiving a synchronization signal including:
  • a base station including: an information determining unit, configured to determine transmission information of a first group of synchronization signals, where the first group of synchronization signals includes at least one synchronization signal; and a time determination unit configured to use the information according to the information
  • the sending information determined by the determining unit determines a sending moment of the second synchronization signal
  • the sending unit is configured to send the second synchronization signal according to a sending moment of the second synchronization signal determined by the timing determining unit.
  • a UE including: a detecting unit, configured to detect a first group of synchronization signals to obtain a first group of synchronization signals, The first group of synchronization signals includes at least one synchronization signal; the time determination unit is configured to determine a detection time of the second synchronization signal according to the transmission information of the first group of synchronization signals;
  • the detecting unit is further configured to detect the second synchronization signal to acquire a second synchronization signal at a detection time determined by the timing determining unit.
  • a base station including:
  • the processor, the communication interface, and the memory complete communication with each other through a bus; the communication interface is configured to communicate with an external device;
  • the memory is configured to store a program
  • the processor is configured to execute the program, where the program includes: an information determining unit, configured to determine transmission information of a first group of synchronization signals, where the first group of synchronization signals includes at least one synchronization signal; a unit, configured to determine a transmission timing of the second synchronization signal according to the transmission information determined by the information determining unit, and a sending unit, configured to send the second synchronization signal according to a sending moment of the second synchronization signal determined by the timing determining unit .
  • a UE including:
  • the processor, the communication interface, and the memory complete communication with each other through a bus; the communication interface is configured to communicate with an external device;
  • the memory is configured to store a program
  • the processor configured to execute the program;
  • the program includes: a detecting unit, configured to detect a first group of synchronization signals to obtain a first group of synchronization signals, wherein the first group of synchronization signals includes at least one synchronization signal; and a timing determining unit, configured to Sending information of a set of synchronization signals, determining a detection time of the second synchronization signal;
  • the detecting unit is further configured to detect the second synchronization signal to acquire a second synchronization signal at a detection time determined by the timing determining unit.
  • the UE determines the transmission timing of the second synchronization signal by using the transmission information of the first group of synchronization signals, and the base station sends the second synchronization signal at the transmission moments, and the UE may determine the second synchronization signal by using the transmission information of the first synchronization signal.
  • Detection time, and detecting the second synchronization signal at the detection timing of the second synchronization signal therefore, the base station can achieve interference coordination with other cells by selecting the transmission timing of the second synchronization signal, and the UE can determine the second
  • the detection timing of the synchronization signal, and the detection of the second synchronization signal at these detection times can effectively improve the possibility that the UE detects the second synchronization signal, thereby effectively improving the detection performance of the UE.
  • FIG. 1 is a flow chart of a method for transmitting a synchronization signal according to an embodiment of the present invention
  • FIG. 2 is a flow chart of a method for receiving a synchronization signal according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for sending a synchronization signal according to an embodiment of the present invention
  • FIG. 4 is an exemplary schematic diagram of candidate transmission times of SSs in the sending method in FIG. 3;
  • FIG. 5 is a flowchart of a method for receiving a synchronization signal according to an embodiment of the present invention
  • FIG. 6 is a flow chart of a method for transmitting a synchronization signal according to an embodiment of the present invention
  • FIG. 7 is a flow chart of a method for receiving a synchronization signal according to an embodiment of the present invention.
  • FIG. 8 is a structural block diagram of a base station according to an embodiment of the present invention.
  • FIG. 9 is a structural block diagram of a base station according to an embodiment of the present invention.
  • FIG. 10 is a structural block diagram of a base station according to an embodiment of the present invention.
  • FIG. 1 is a structural block diagram of a UE according to an embodiment of the present invention.
  • FIG. 12 is a structural block diagram of a UE according to an embodiment of the present invention
  • FIG. 13 is a structural block diagram of a UE according to an embodiment of the present invention
  • FIG. 14 is a structural block diagram of a UE according to an embodiment of the present invention
  • FIG. 15 is a structural block diagram of a UE according to an embodiment of the present invention
  • FIG. 16 is a structural block diagram of a UE according to an embodiment of the present invention.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • the terminology of the present invention is not limited, but for convenience of description, the system is not limited to the description of the system, the LTE-A (Long Term Evolution-Advanced) system, the Universal Mobile Telecommunication System (UMTS), and the like.
  • An embodiment of the present invention will be described by taking an LTE network as an example.
  • Embodiments of the present invention can be used in wireless networks of different standards.
  • a wireless access network may include different network elements in different systems.
  • the network elements of the radio access network in LTE (Long Term Evolution) and LTE-A (Long Term Evolution-Advanced) include eNB (eNodeB, evolved base station), WCDMA (Wideband Code Division) Multiple Access, Wideband Code Division Multiple Access)
  • the network elements of the radio access network include RNC (Radio Network Controller) and NodeB.
  • WiMax Worldwide Interoperability for Microwave Access, Global Interoperability for Microwave Access
  • the other wireless network may also use a solution similar to the embodiment of the present invention, but the related modules in the base station system may be different, and the embodiment of the present invention is not limited.
  • the following embodiments will use the network side device as the network side device. The example is explained.
  • the user equipment includes but is not limited to a mobile station (MS, Mobile Station), a mobile terminal (Mobile Terminal), a mobile telephone (Mobile Telephone), a mobile phone (handset). And portable equipment, etc., the user equipment can communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment can be a mobile phone (or "cellular" Telephone), a computer having a wireless communication function, etc., and the user device can also be a portable, portable, handheld, computer built-in or in-vehicle mobile device.
  • RAN Radio Access Network
  • the base station may be a base station (Base Transceiver Station, BTS) in a GSM system, a GPRS system, or a CDMA system, or may be a base station (NodeB) in a CDMA2000 system or a WCDMA system, or may be an LTE system.
  • BTS Base Transceiver Station
  • NodeB base station
  • eNodeB Evolved NodeB
  • ASN BS Access Service Network Base Station
  • the term "and/or" in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B alone.
  • the character " /" in this text generally indicates that the contextual object is an "or" relationship.
  • the embodiment of the invention provides a method for transmitting a synchronization signal, which is executed by a base station, as shown in FIG. 1, and includes the following steps:
  • the base station determines sending information of the first group of synchronization signals.
  • at least one synchronization signal is included in the first group of synchronization signals.
  • the transmission information of the first group of synchronization signals is the transmission parameter used in the process of transmitting the first group of synchronization signals by the base station or the information indicated by the transmission of the first group of synchronization signals.
  • the transmission information of the first group of synchronization signals may be a transmission parameter corresponding to one or several synchronization signals of the first group of synchronization signals, or may be indicated by one of the first group of synchronization signals.
  • the first synchronization signal includes a first synchronization signal
  • the transmission information of the first synchronization signal includes at least one of a transmission sequence, a transmission period, and a transmission timing of the first synchronization signal.
  • the first group of synchronization signals includes at least two synchronization signals.
  • the transmission information of the first group of synchronization signals may be at least two of the first group of synchronization signals.
  • the transmission sequence of the one or more synchronization signals, the transmission period, the transmission time, or at least two of the foregoing, the transmission information of the first group of synchronization signals may also be indicated by at least one of the first group of synchronization signals.
  • Subframe and/or radio frame timing information refers to the start and end points of the subframe
  • the radio frame timing information refers to the start and end points of the radio frame.
  • the first group of synchronization signals includes S SS
  • SS S is transmitted once in each of subframe 0 and subframe 5 in one radio frame, and the sequences of the two transmissions are interleaved differently, so the UE can obtain the two S from The interleaving mode sent by the SS to distinguish which one is the subframe 0, which one is the subframe 5, and the first symbol of the subframe 0 can be regarded as the frame header of the radio frame, that is, Start point.
  • the base station determines, according to the determined transmission information, a transmission timing of the second synchronization signal.
  • the second synchronization signal is used for cell identification by the UE, and if the UE can normally detect the second synchronization signal, the cell can be identified and the cell is accessed.
  • the base station determines the transmission time of the second group of synchronization signals by using the transmission information of the first group of synchronization signals, and the base station can determine the second synchronization signal after knowing the transmission information of the first group of synchronization signals. Send time.
  • the base station when determining, by the base station, the transmission timing of the second synchronization signal, the base station may select the transmission timing of the second synchronization signal in order to effectively reduce the interference generated when the second synchronization signal is transmitted between the cells. Different from the sending time of the second synchronization signal sent by the at least one cell in the other cell, the base station and the plurality of other cells can be prevented from simultaneously transmitting the second synchronization signal, thereby effectively reducing the base station and other cells when transmitting the second synchronization signal. The generated interference further improves the receiving performance of the UE on the second synchronization signal.
  • the transmission period of each synchronization signal is generally the same, and in the embodiment of the present invention, in particular, when the base station determines the transmission timing of the second synchronization signal, the transmission period of the second synchronization signal can be made.
  • the transmission period of the second synchronization signal is lengthened, that is, in this step, the base station can make the second when determining the transmission timing of the second synchronization signal.
  • the transmission period of the synchronization signal is greater than the transmission period of at least one synchronization signal in the first group of synchronization signals.
  • the transmission timing of the second synchronization signal determined by the base station and other cells is the current standard.
  • this step can be implemented in the following three ways: One:
  • the base station first determines a candidate transmission time of the second synchronization signal according to the transmission information of the first group of synchronization signals; and then, in the determined candidate transmission time, selects a partial or all candidate transmission time as the transmission timing of the second synchronization signal.
  • the base station may determine the candidate transmission time of the second synchronization signal according to the transmission information of the first group of synchronization signals and the correspondence between the transmission information and the candidate transmission time of the second synchronization signal.
  • the candidate transmission time of the second synchronization signal refers to all times at which the second synchronization signal can be transmitted, and each candidate transmission time may be one or consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols. It can also be one or a plurality of consecutive subframes, or it can be a discrete number of symbols, which are respectively located in different subframes or time slots.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the base station can select all or part of these candidate transmission times as the transmission timing of the second synchronization signal.
  • the base station may select to send the second synchronization signal at a part of the candidate transmission time, so that the transmission period of the second synchronization signal may be Longer, it is convenient for interference avoidance between different cells with the same candidate transmission time.
  • the correspondence between the transmission information of the first group of synchronization signals and the candidate transmission time of the second synchronization signal is preset, and is known.
  • both the base station and the UE can determine the candidate transmission time of the second synchronization signal according to the preset correspondence, and the UE will detect the second synchronization signal at these candidate transmission moments to obtain Second synchronization signal.
  • the UE since the UE can know the candidate transmission time of the second synchronization signal, and the second synchronization signal is transmitted at some of the candidate transmission times, the UE only needs to detect the second synchronization signal at the determined candidate transmission time. , reducing the complexity of the detection.
  • each cell may separately select a different transmission time to send a second synchronization signal, thereby effectively reducing interference generated when each second cell transmits a second synchronization signal, and further The receiving performance of the UE to the second synchronization signal is improved.
  • the candidate transmission times of the second synchronization signals of the cells in the communication network are the same.
  • each cell can perform interference coordination.
  • the base station can select other interfaces in the communication network.
  • the candidate transmission time of the at least one cell in the cell is used as the transmission time of the second synchronization signal, thereby effectively reducing the interference generated when the second synchronization signal is transmitted between the base station and other cells, and further improving the UE receiving the second synchronization signal. performance.
  • the embodiment of the present invention does not limit the correspondence between the transmission information of the first group of synchronization signals and the candidate transmission time of the second synchronization signal, as long as the base station and the UE can determine the candidate transmission time of the second synchronization signal according to the correspondence. .
  • each type of transmission information may correspond to a set of candidate transmission moments, which may directly correspond to each other, that is, each type of transmission information directly corresponds to a set of candidate transmission moments, and after the information is known to be transmitted, no further The calculation can directly determine the candidate transmission time.
  • they can also be a functional relationship, that is, after the information is known to be transmitted, the candidate transmission time can be obtained by calculation.
  • the first group of synchronization signals includes a first synchronization signal
  • the transmission information of the first group of synchronization signals is the transmission timing of the first synchronization signal, the transmission timing of the first synchronization signal, and the candidate transmission timing of the second synchronization signal.
  • the candidate transmission time of the second synchronization signal is the nth symbol after the transmission timing of the first synchronization signal, and n is an integer. After the transmission timing of the first synchronization signal is known, the base station can determine by calculation. The candidate transmission time of the second synchronization signal.
  • the transmission information of the first group of synchronization signals is a transmission sequence of the first synchronization signal
  • the correspondence between the transmission sequence of the first synchronization signal and the candidate transmission time of the second synchronization signal is previously set in a list manner.
  • Each of the transmission sequences of a synchronization signal respectively corresponds to a different set of candidate transmission times of the second synchronization signal, that is, a transmission sequence of the first synchronization signal is known, and the base station can find the transmission sequence with the first synchronization signal by looking up the table.
  • a set of candidate transmission times of the corresponding second synchronization signal, that is, a candidate transmission time of the second synchronization signal is determined. Similar to the above example, various correspondences can be set in the embodiment of the present invention, which will not be described in detail herein.
  • the first set of synchronization signals includes a synchronization signal
  • the transmission information of the first group of synchronization signals is the transmission time of the first synchronization signal
  • the transmission time of the first synchronization signal has a corresponding relationship with the candidate transmission time of the second synchronization signal
  • the correspondence relationship is:
  • the transmission timing of the synchronization signal is the candidate transmission timing of the second synchronization signal. Assuming that the transmission period of the first synchronization signal is 10 ms and the transmission period of the second synchronization signal is 100 ms, if the UE wants to detect the second synchronization signal, the UE may go every millisecond of each transmission period of the second synchronization signal.
  • each of the second synchronization signals has a transmission time of 10 first synchronization signals in a transmission period of 100 ms, that is, a candidate transmission time having 10 second synchronization signals, and the base station will be at the 10 moments.
  • the second synchronization signal is sent in all or part of the time, and the UE only needs to detect the second synchronization signal at the 10 moments, and does not need to detect the second synchronization signal at every moment in 100 ms, thereby reducing detection. the complexity.
  • the second synchronization signals of different cells may be sent by using different candidate transmission moments respectively, for example, the first one of the cell 1 is used.
  • the second synchronization signal is sent by the candidate transmission time, and the second synchronization signal is sent by the cell 2 with the fifth candidate transmission time, so that the UEs in different cells can detect the second synchronization signal of the respective cell, and the second between the cells.
  • the synchronization signals are time-staggered, thus achieving interference avoidance and improving detection performance.
  • the base station determines the transmission timing of the second synchronization signal based on the transmission information of the first group of synchronization signals and the correspondence between the transmission information and the transmission timing of the second synchronization signal.
  • the correspondence between the transmission information of the first group of synchronization signals and the transmission timing of the second synchronization signal is the same as the transmission information of the first group of synchronization signals and the candidate transmission time of the second synchronization signal described in the first implementation manner. The correspondence is similar and will not be described here.
  • the corresponding relationship may be preset, so that the time when the base station sends the second synchronization signal is different from the at least one of the other cells in the communication network, thereby effectively reducing the difference between the base station and other cells when transmitting the second synchronization signal. Interference, improve the UE's reception performance of the second synchronization signal.
  • the correspondence between the transmission information of the first group of synchronization signals and the transmission timing of the second synchronization signal is preset, and the first is known.
  • both the base station and the UE can determine the transmission timing of the second synchronization signal according to the preset correspondence, and the UE will detect the second synchronization signal at these transmission moments to obtain the second synchronization.
  • the signal because the base station can select to transmit the second synchronization signal at a different time than the at least one of the other cells in the communication network, thereby effectively reducing interference generated when the second synchronization signal is transmitted between the base station and other cells, thereby effectively improving
  • the UE detects the possibility of the second synchronization signal, thereby effectively improving the detection performance of the UE.
  • the base station first determines the candidate transmission time of the second synchronization signal, and then selects part or all of the candidate transmission time as the transmission timing of the second synchronization signal based on the transmission information of the first group of synchronization signals.
  • the candidate transmission time has the same meaning as the candidate transmission time of the first mode, and refers to all times at which the second synchronization signal can be transmitted, which is not described herein.
  • the base station first determines the candidate transmission time of the second synchronization signal, and then uses the correspondence between the transmission information of the first group of synchronization signals and the second synchronization signal, in these candidate transmission moments. , select the transmission timing of the second synchronization signal.
  • These candidate transmission times may be preset or may be determined by the base station and notified to the UE, for example, determined according to the current channel state or the like, or determined by interference coordination with other cells in the network. Therefore, the candidate transmission time of the second synchronization signal determined by the base station may be the same as or completely different from the candidate transmission time of the other cells in the communication network, and when the transmission timing of the second synchronization signal is selected, the base station may select the transmission.
  • the time is only the same as or different from the transmission time selected by the other cells, which effectively reduces the interference generated when the second synchronization signal is sent between the base station and other cells, so that the UE can effectively improve the possibility of detecting the second synchronization signal.
  • Sexuality which in turn effectively improves the detection performance of the UE.
  • the base station may select the time for transmitting the second synchronization signal and other cells in the communication network. At least one of the cells is different, thereby effectively reducing interference generated when the second synchronization signal is transmitted between the base station and other cells, and improving the receiving performance of the second synchronization signal by the UE.
  • the UE may determine a candidate transmission time of the second synchronization signal according to a preset or a notification of the base station, and the UE may use the transmission information of the first group of synchronization signals at the candidate transmission moments.
  • the interference generated when the second synchronization signal is sent between the base station and other cells is effectively reduced, and the possibility that the UE detects the second synchronization signal is inevitable, and the detection performance of the UE is effectively improved when performing cell identification.
  • the base station sends a second synchronization signal according to a sending moment of the second synchronization signal.
  • the method for transmitting a synchronization signal according to the embodiment of the present invention, the base station can determine the transmission timing of the second synchronization signal by using the transmission information of the first group of synchronization signals, and the base station sends the second synchronization signal at the transmission moments, and the UE can pass the The transmission information of the synchronization signal determines the transmission timing or the candidate transmission timing of the second synchronization signal, and detects the second synchronization signal at these moments. Therefore, the base station can realize the connection with other cells by selecting the transmission timing of the second synchronization signal.
  • Interference coordination can prevent the base station from transmitting the second synchronization signal simultaneously with multiple other cells, thereby effectively reducing the interference generated by the base station and other cells when transmitting the second synchronization signal, and the UE is at its determined transmission time or candidate transmission time.
  • the second synchronization signal is detected, so that the possibility that the UE detects the second synchronization signal can be effectively improved, thereby effectively improving the detection performance of the UE.
  • the synchronization signal may be transmitted with the second synchronization signal through the same or different serving cell (also referred to as a carrier).
  • the plurality of synchronization signals may be transmitted through the same or different serving cells.
  • the first group of synchronization signals includes a plurality of synchronization signals, and the plurality of synchronization signals are transmitted through the same serving cell, the second synchronization signal may be the same as the first group of synchronization signals
  • the serving cell transmission can also be sent through different serving cells.
  • the method further includes:
  • the first set of synchronization signals includes only a first synchronization signal, such as a primary synchronization signal; and the second synchronization signal is, for example, a secondary synchronization signal.
  • the combination of the first synchronization signal and the second synchronization signal is referred to as a second group of synchronization signals.
  • the second set of sync signals are different in the first and second fields of the radio frame.
  • the first field is a subframe 0 to 4 of a radio frame
  • the second field is a subframe 5 to 9 of a radio frame.
  • the UE can determine the carrier type and/or frame timing information based on the second set of synchronization signals at different locations in the two fields.
  • the carrier type includes the backward compatible carrier and the new carrier because the PS S and S S S on the backward compatible carrier are the same in both fields and different on the new carrier.
  • the new carrier is generally non-backward compatible, that is, the lower version of the UE may not be accessed by the new carrier, nor may it be camped on the new carrier; the feature of the new carrier may also include the following At least one of the following: the common carrier on the new carrier receives the common control information, such as the scheduling system message, the paging message, the ePDCCH of the random access response message, the ePDCCH is precoded and transmitted by the channel information, and the resource is allocated by the physical resource.
  • the block or physical resource block pair is a unit; the cell-specific reference signal on the new carrier is not transmitted every subframe, for example, 5 subframes are transmitted; only the transmission module based on the UE-specific reference signal is supported on the new carrier; specifically:
  • the relative positional relationship between the primary synchronization signal and the secondary synchronization signal in the second group of synchronization signals is the same in the first field and the second field, for example, the symbols of the primary synchronization signal and the secondary synchronization signal are adjacent and the primary synchronization signal After the time is up, the other does not rule out.
  • the second set of sync signals differ in absolute time domain positions of the two fields, such as different symbol positions and/or sub-frame positions.
  • An example that satisfies the above conditions is: PS S and SSS are respectively located in the second symbol and the third symbol of subframe 0 of the first field, and PSS and SSS are respectively located in the third of subframe 5 of the second field. Symbols and the fourth symbol, other similar positions are not excluded.
  • the frame timing can be determined by comparing different time intervals of the second group of synchronization signals of the two fields, for example, if the UE detects the previous field.
  • Second set of sync signal distance The time interval of the second group of synchronization signals from the next field is 5 subframes and one more symbol, the UE determines that the previous field is the first field of a radio frame, and the latter frame is a radio frame.
  • the second half of the frame conversely, if the UE detects that the second group of synchronization signals of the previous field is separated from the second group of synchronization signals of the next field by 5 subframes but one symbol less, the UE determines the foregoing One field is the second field of a radio frame, and the latter field is the first field of a radio frame. Further, the UE may also determine the carrier type by a similar method as described above, that is, by the positional relationship of the second group of synchronization signals of the two fields.
  • the relative positional relationship between the primary synchronization signal and the secondary synchronization signal in the second group of synchronization signals is different in the first field and the second field, for example, PS S and SSS are respectively located in the subframe 0 of the first field.
  • the 2nd symbol and the 3rd symbol, PS S and SSS are respectively located in the 2nd symbol and the 4th symbol of the subframe 5 of the second field.
  • Other symbol positions are not excluded, or the subframe positions may be different.
  • the second group of synchronization signals occupy different subframes in two fields.
  • the method for determining the frame timing and/or the carrier type is the same as the above embodiment, and details are not described herein again.
  • the UE can obtain a frame synchronization signal, and/or carrier type information, and can ensure that the UE detects a set of PSS and SSS methods and existing mechanisms, that is, The mechanism on the string-compatible carrier is the same, because the relative position of the PSS and SSS can remain unchanged, which can greatly reduce the complexity of the cell search.
  • the embodiment of the present invention further provides a method for receiving a synchronization signal. As shown in FIG. 2, the method includes:
  • U E detecting the first group of synchronization signals to obtain the first group of synchronization signals.
  • at least one synchronization signal is included in the first group of synchronization signals.
  • the UE determines, according to the sending information of the first group of synchronization signals, a detection time of the second synchronization signal.
  • the transmission information of the first group of synchronization signals is the transmission parameter used by the base station to send the first group of synchronization signals or the information indicated by the transmission of the first group of synchronization signals.
  • the second synchronization signal is used for cell identification by the UE. If the UE can normally detect the second synchronization signal, the cell can be identified and the cell is accessed. It should be noted that, in all embodiments of the present invention, the "transmission time" is described corresponding to the base station side, and the “detection time” is described corresponding to the UE side. For the UE, all or part of the second synchronization signal is in the detection time.
  • the time transmission that is, "the detection timing of the second synchronization signal, necessarily includes the "transmission timing of the second synchronization signal”.
  • step 102 corresponding to the three implementation manners of step 102 in the foregoing sending method embodiment, the following two implementation manners are available in this step:
  • the UE may be based on the sending information of the first group of synchronization signals, and the correspondence between the sending information and the detection time of the second synchronization signal, The detection timing of the second synchronization signal is determined.
  • the correspondence between the transmission information of the first group of synchronization signals and the detection time of the second synchronization signal is preset, and the UE knows the transmission information of the first group of synchronization signals and the second synchronization. The correspondence between the detection times of the signals.
  • the correspondence between the transmission information of the first group of synchronization signals and the detection time of the second synchronization signal used by the UE is
  • the correspondence between the transmission information of the first group of synchronization signals used by the base station and the candidate transmission time of the second synchronization signal may be the same. That is to say, the detection time determined by the UE is the candidate transmission time determined by the base station, and the meanings of the two are equivalent.
  • the base station Since the base station transmits the second synchronization signal to some or all of the candidate transmission times, the UE only needs to detect the second synchronization signal at the determined detection time, thereby reducing the complexity of the detection, and on the other hand, the base station can Selecting a transmission time of the second synchronization signal in the candidate transmission time, effectively reducing interference generated when the second synchronization signal is transmitted between the base station and other cells, improving the possibility that the UE detects the second synchronization signal, and further performing the cell When identifying, the detection performance of the UE is effectively improved.
  • the correspondence between the transmission information of the first group of synchronization signals and the detection time of the second synchronization signal used by the UE may be related to the transmission information of the first group of synchronization signals and the transmission timing of the second synchronization signal used by the base station.
  • the correspondence is the same. That is to say, the detection time determined by the UE is the transmission time determined by the base station. The meaning of the two is equivalent. Because the corresponding relationship is preset, the time when the base station sends the second synchronization signal is different from the at least one of the other cells in the communication network, thereby effectively reducing the time when the second synchronization signal is sent between the base station and other cells.
  • the generated interference improves the receiving performance of the UE to the second synchronization signal.
  • the UE may first determine the candidate detection time of the second synchronization signal, and then select part or all according to the transmission information of the first group of synchronization signals.
  • the candidate detection time is used as the detection timing of the second synchronization signal.
  • the UE may select, according to the partial candidate detection time corresponding to the sending information, the detection time of the second synchronization signal.
  • the candidate detection time determined by the user is the candidate transmission time determined by the base station, and the correspondence between the transmission information of the first group of synchronization signals and the candidate detection time of the second synchronization signal used by the UE may be adopted by the base station.
  • the correspondence between the transmission information of the first group of synchronization signals and the transmission timing of the second synchronization signal is the same.
  • the candidate transmission time of the second synchronization signal determined by the base station may be the same as or completely different from the candidate transmission time of other cells in the communication network, and when the transmission timing of the second synchronization signal is selected, The transmission time selected by the base station is only the same or completely different from the transmission time selected by the other cells, which effectively reduces the interference generated when the second synchronization signal is sent between the base station and other cells, so that the UE can effectively improve the detection.
  • the possibility of the second synchronization signal thereby effectively improving the detection performance of the UE.
  • the base station selects the transmission timing of the second synchronization signal according to the transmission information of the first group of synchronization signals
  • the time at which the base station selects to send the second synchronization signal is different from at least one of the other cells in the communication network, thereby effectively reducing the base station and
  • the interference generated when the second synchronization signal is transmitted between other cells improves the reception performance of the UE to the second synchronization signal.
  • the corresponding relationship between the foregoing two methods is preset, and may be a direct correspondence or a function relationship.
  • the corresponding relationship between the foregoing two methods is preset, and may be a direct correspondence or a function relationship.
  • the UE detects the second synchronization signal to obtain the second synchronization signal at the determined detection time.
  • the sending period of the second synchronization signal acquired by the UE may be greater than the sending period of the at least one synchronization signal in the first group of synchronization signals.
  • the receiving method of the synchronization signal provided by the embodiment of the present invention the UE may determine the detection time of the second synchronization signal by using the transmission information of the first synchronization signal, and detect the second synchronization signal at the detection time of the second synchronization signal, therefore, the base station
  • the interference coordination with other cells can be implemented by selecting the transmission timing of the second synchronization signal, and the base station can be prevented from simultaneously transmitting the second synchronization signal with multiple other cells, thereby effectively reducing the base station and other cells when transmitting the second synchronization signal.
  • the generated interference, and the UE can determine the detection timing of the second synchronization signal, and detect the second synchronization signal at the detection timings, thereby effectively improving the possibility that the UE detects the second synchronization signal, thereby effectively improving the detection of the UE. performance.
  • the UE in step 201, needs to determine the detection time of the second synchronization signal according to the transmission information of the first group of synchronization signals.
  • the transmission information of the first group of synchronization signals is the transmission parameter used in the process of transmitting the first group of synchronization signals by the base station or the information indicated by the transmission of the first group of synchronization signals.
  • the embodiment of the present invention does not limit how the UE obtains the transmission information of the first group of synchronization signals, and may have multiple manners.
  • the first group of synchronization signals includes a first synchronization signal
  • the transmission information of the first group of synchronization signals is at least one of a transmission sequence, a transmission period, and a transmission timing of the first synchronization signal.
  • the UE may acquire the transmission sequence of the first synchronization signal according to the first synchronization signal acquired in step 200, that is, detect the first synchronization by detecting the first synchronization signal.
  • the transmission sequence of the step signal the UE may also acquire the transmission timing of the first synchronization signal according to the first synchronization signal acquired in step 200, that is, by detecting the first synchronization signal, for the transmission timing of the first synchronization signal.
  • the UE detects the first synchronization signal in a certain subframe in a certain radio frame, that is, the transmission timing of the first synchronization signal is the subframe of the radio frame.
  • the transmission period of the first synchronization signal optionally, it may be preset, and the UE may acquire the transmission period of the first synchronization signal according to the preset, which may also be the UE according to the method acquired by the UE in step 200.
  • a synchronization signal acquires a transmission period of the first synchronization signal, that is, the UE acquires a transmission period of the first synchronization signal by detecting the first synchronization signal at different transmission timings.
  • the UE may determine the period by detecting the first synchronization signal multiple times. If the transmission period of the first synchronization signal is 5 ms, the UE may detect a first synchronization signal at different transmission moments, and a correlation peak occurs every 5 ms. Therefore, the UE can determine that the transmission period of the first synchronization signal is 5 ms.
  • the first group of synchronization signals includes at least two synchronization signals.
  • the transmission information of the first group of synchronization signals may be a subframe indicated by at least one of the first group of synchronization signals.
  • And/or radio frame timing information where the subframe timing information refers to the start and end points of the subframe, and the radio frame timing information refers to the start and end points of the radio frame.
  • the UE can obtain the two S from The interleaving method sent by the SS to distinguish which one is the subframe 0, which one is the subframe 5, and the first symbol of the subframe 0 can be regarded as the frame header of the radio frame, that is, the starting point.
  • the receiving method of the synchronization signal may further include:
  • the UE performs cell or cell group identification according to the acquired second synchronization signal.
  • the first group of synchronization signals includes a first synchronization signal, and the UE determines the detection timing of the second synchronization signal in step 201, and then determines the detection timing of the second synchronization signal.
  • the UE may not have to detect all sequences of the second synchronization signal at each detection time.
  • the UE may detect the first sequence set of the second synchronization signal at the first detection time, and detect the second sequence set of the second synchronization signal at the second detection time, where the sequence of the first sequence set is The number of sequences in the number and/or the second sequence set is smaller than the total number of cell identifiers or the total number of cell group identifiers that the second synchronization signal needs to indicate, so that the detection complexity of the UE can be effectively simplified.
  • the sequence in the first sequence set and the sequence in the second sequence set may be the same or different. If the sequence in the first sequence set and the sequence in the second sequence set are the same, the UE may be convenient.
  • the detection of the second synchronization signal simplifies the checking complexity of the UE.
  • the method further includes:
  • the first set of synchronization signals includes only a first synchronization signal, such as a primary synchronization signal; and the second synchronization signal is, for example, a secondary synchronization signal.
  • the combination of the first synchronization signal and the second synchronization signal is referred to as a second group of synchronization signals.
  • the second set of synchronization signals are different in position of the first field and the second field of the radio frame.
  • the first field is a subframe 0 to 4 of a radio frame
  • the second field is a subframe 5 to 9 of a radio frame.
  • the UE can determine the carrier type and/or frame timing information according to the second set of synchronization signals at different positions of the two fields.
  • the carrier type includes a backward compatible carrier and a new carrier because the PS S and S SS on the backward compatible carrier are the same in both half frames and different on the new carrier.
  • the new carrier is generally non-backward compatible, that is, the lower version of the UE may not be accessed by the new carrier, nor may it be camped on the new carrier; the feature of the new carrier may also include the following At least one of the following: the common carrier on the new carrier receives the common control information, such as the scheduling system message, the paging message, the ePDCCH of the random access response message, the ePDCCH is precoded and transmitted by the channel information, and the resource is allocated by the physical resource.
  • the block or physical resource block pair is a unit; the cell-specific reference signal on the new carrier is not transmitted every subframe, for example, 5 subframes are transmitted; only the transmission module based on the UE-specific reference signal is supported on the new carrier; specifically:
  • the relative positional relationship between the primary synchronization signal and the secondary synchronization signal in the second group of synchronization signals is the same in the first field and the second field, for example, the symbols of the primary synchronization signal and the secondary synchronization signal are adjacent and the primary synchronization signal After the time is up, the other does not rule out.
  • the second set of sync signals differ in absolute time domain positions of the two fields, such as different symbol positions and/or sub-frame positions.
  • An example that satisfies the above conditions is: PSS and SSS are respectively located in the second symbol and the third symbol of subframe 0 of the first field, and PSS and SSS are respectively located in the third symbol of subframe 5 of the second field.
  • the 4th symbol other similar positions are not excluded.
  • the UE can determine the frame timing by comparing different time intervals of the second group of synchronization signals of the two fields, for example, if the UE detects the first half of the frame.
  • the second group of synchronization signals is separated from the second group of synchronization signals of the next field by a period of 5 symbols, and the UE determines that the previous field is the first field of a radio frame, and the latter field Is the second field of a radio frame; conversely, if the UE detects that the second group of synchronization signals of the previous field is separated from the second group of synchronization signals of the latter field by 5 subframes but one symbol less, The UE determines that the previous field is the second field of a radio frame, and the latter field is the first field of a radio frame. Further, the UE may also determine the carrier type by a similar method as described above, that is, by the positional relationship of the second group of synchronization signals of the two fields.
  • the relative positional relationship between the primary synchronization signal and the secondary synchronization signal in the second group of synchronization signals is different in the first field and the second field, for example, the PSS and the SSS are respectively located in the subframe 0 of the first field.
  • the 2nd symbol and the 3rd symbol, PSS and SSS are respectively located in the 2nd symbol and the 4th symbol of the subframe 5 of the second field.
  • Other symbol positions are not excluded, or the subframe positions may be different.
  • the second group of synchronization signals occupy different subframes in two fields.
  • the method for determining the frame timing and/or the carrier type is the same as the above embodiment, and details are not described herein again.
  • the UE can obtain a frame synchronization signal, and/or carrier type information, and can ensure that the UE detects a set of PSS and SSS methods and existing mechanisms, that is, The mechanism on the string-compatible carrier is the same, because the relative position of the PSS and SSS can remain unchanged, which can greatly reduce the complexity of the cell search.
  • the method for transmitting and receiving a synchronization signal provided by an embodiment of the present invention is further described in detail below through a specific embodiment.
  • the first synchronization signal includes a first synchronization signal, and the first synchronization signal and the second synchronization signal are sent by using the same serving cell.
  • the first synchronization signal is the primary synchronization signal PSS
  • the second The synchronization signal is an example of the secondary synchronization signal SSS. It is to be understood that the present invention is not limited to the same.
  • the first synchronization signal and the second synchronization signal may also be other synchronization signals.
  • the embodiment is as follows:
  • the sending method performed by the base station includes:
  • the transmission information of the PSS includes a transmission sequence of the PSS, a transmission period, a transmission time, and the like.
  • the number of sequences used by the base station to transmit the PSS is not limited, and may be less. For example, only three Zadoff-Chu sequences are used, and only one Zadoff-Chu sequence ⁇ 'J may be used.
  • the UE when the PSS is detected, because the sequence of the PSS is small, the detection time spent by the UE is reduced, the difficulty of detecting the P S S by the UE is reduced, and the UE detection performance is effectively improved. It can be understood that, in the communication network where the base station is located, in addition to the base station, several other base stations, that is, several cells, are included.
  • the base station may use the same sequence as at least one other cell in the system, and send the PSS to the user equipment simultaneously with the at least one other cell.
  • the base station adopts the same sequence as other cells and simultaneously transmits the PSS with the other cells, so that the UE can be provided with the combining gain, and the detection performance of the UE is further improved.
  • each cell in the system uses the same sequence, that is, the entire network uses the same sequence, and each cell simultaneously transmits the PSS.
  • the period in which the base station sends the PSS that is, the sending period of the PSS may be, for example, 5 ms or 10 ms.
  • the transmission information of the PSS used in this step may be at least one of a transmission sequence, a transmission period, and a transmission timing of the PSS.
  • the correspondence between the pre-set PSS transmission information and the candidate transmission time of the SSS may be a direct correspondence relationship, that is, the transmission information of each PSS corresponds to a candidate transmission time of the SSS, or may be a function correspondence relationship, and the SSS candidate
  • the transmission time is a function of the transmission information of the PSS, and based on the transmission information of the PSS, the candidate transmission time of the SSS can be calculated.
  • the transmission period of the PSS is 10 ms
  • the transmission time is respectively subframes 0, 10, 20...
  • the period of the candidate transmission time of the SSS is predefined, which is 5 ms.
  • the candidate transmission time of each SSS is three consecutive symbols on one subframe
  • the correspondence between the candidate transmission time of the SSS and the transmission time of the PSS is the start time of the candidate transmission time of the SSS and the start time of the transmission time of the PSS.
  • the base station can determine that the candidate transmission time of the SSS is three consecutive symbols and subframes in the subframe 0 according to the foregoing correspondence relationship and the preset period of the candidate transmission time of the SSS. 5 consecutive symbols on 5...
  • the base station may select a transmission time of the SSS by coordinating interference with other cells, so that the base station sends the second synchronization signal by using a candidate transmission time different from the second synchronization signal of other cells in the communication network, thereby implementing the base station and the different Interference coordination between cells.
  • the candidate transmission times of the cells in the communication network are the same, and the second synchronization signals of different cells can be separately transmitted with different candidate transmission times, and the base station can coordinate with the interference between the cells.
  • selecting a time in the candidate transmission time to send the second synchronization signal for example, the cell 1 transmits the second synchronization signal by using the first candidate transmission time, and the cell 2 transmits the second synchronization signal by using the fifth candidate transmission time, so that the cell is in a different cell.
  • the UE can detect the second synchronization signal of the respective cell, and the second synchronization signal between the cells is time-staggered, thereby achieving interference avoidance and improving detection performance.
  • the receiving method performed by the UE includes:
  • the transmission information of the PSS used by the UE may be at least one of a transmission sequence, a transmission period, and a transmission time of the PSS.
  • the correspondence between the pre-set PSS transmission information and the candidate detection time of the SSS may be a direct correspondence, that is, the transmission information of each PSS corresponds to a candidate detection time of the SSS, or may be a function correspondence relationship, and the SSS candidate
  • the detection time is a function of the transmission information of the PSS, and based on the transmission information of the PSS, the candidate detection time of the SSS can be calculated.
  • the UE may obtain the preset information, or may be detected by the detection process of the PSS in step 401. If the transmission information of the PSS is the transmission sequence and/or the transmission time of the PSS, the UE may detect the detection procedure of the PSS in step 401. Similarly, as shown in FIG.
  • the transmission period of the PSS is 10 ms
  • the transmission time is respectively subframes 0, 10, 20...
  • the period of the candidate transmission time of the SSS is predefined, which is 5 ms
  • each The candidate transmission time of the SSS is three consecutive symbols in one subframe
  • the correspondence between the candidate detection time of the SSS and the transmission time of the PSS is that the start time of the candidate detection time of the SSS is the same as the start time of the transmission time of the PSS.
  • the UE detects that the transmission time of the PSS is the subframe 0, 10..., and the UE according to the foregoing correspondence relationship and the preset period of the candidate detection time of the SSS, It can be determined that the candidate detection time of the SSS is three consecutive symbols on the subframe 0, and three consecutive symbols on the subframe 5.
  • the SSS is detected to obtain the SSS.
  • the sending period of the PSS is greater than the period of the candidate detection time of the SSS
  • the sending time of the two adjacent PSSs will have at least two candidate detecting moments.
  • the UE is When detecting the SSS, since the candidate detection moments have temporal differentiation, the UE may not have to detect all sequences of the SSS at each of the at least two candidate detection moments. For example, in the at least two candidate detection times, the number of detected sequences is smaller than the number of cell identifiers or cell group identifiers that the SSS needs to indicate.
  • the physical cell identity is identified. Specifically, when the entire network uses a unified PSS sequence, in this step, the UE may determine the physical cell identifier according to the sequence of the detected SSS, and when the PSS of the entire network has multiple sequences, the UE may combine the PSS and the SSS. The sequence to determine the physical cell identity.
  • the receiving method in this embodiment may further include:
  • the UE performs symbol synchronization, subframe synchronization, and radio frame synchronization according to the PSS.
  • Symbol synchronization and subframe synchronization can be obtained according to PSS because the length of one symbol and one subframe is fixed, and the symbol position of PSS in one subframe is also fixed. Since the length of the radio frame is 10 ms, the period of the PSS can also be set to 10 ms, and the UE can also determine the synchronization of the radio frame by detecting the PSS. It should be noted that, although the present embodiment is described in order, the present invention is not limited thereto, and those skilled in the art can adjust the order of the above steps.
  • the first group of synchronization signals includes at least two synchronization signals.
  • the first group of synchronization signals includes two synchronization signals, PSS and SSS, as an example.
  • the PSS and the SSS in the first group of synchronization signals are sent by the same serving cell, and the second synchronization signal and the PSS and SSS of the first group of synchronization signals are sent through different serving cells, and the second synchronization signal may be PSS, and It may be a PSS, and may also be other synchronization signals, such as a discovery signal, which may be used not only to identify a cell but also as a radio resource management measurement of at least an idle state, such as reference signal received power measurement and/or reference signal reception quality.
  • the measurement and the like are not limited in this embodiment.
  • This embodiment is specifically: 3 ⁇ 4 port: As shown in FIG. 6, on the base station side, the sending method performed by the base station includes:
  • the primary synchronization signal PSS and the secondary synchronization signal sss of the first group of synchronization signals are respectively sent through the same serving cell.
  • PSS and SSS can be used to indicate subframe timing and radio frame timing information.
  • the start point and the end point of the subframe are determined, which may be specifically detected by the UE detecting the PSS, or detecting the PSS and the SSS, because the positions of the PSS and the SSS in the subframe are predefined; for the radio frame timing That is, determining the start point and the end point of the radio frame, which can be obtained by detecting the SSS.
  • the SSS is sent once in each of the subframe 0 and the subframe 5 in one radio frame, and the interleaving manners of the two transmitted sequences are different.
  • the UE can distinguish which one is subframe 0 and which one is subframe 5 from the interleaving manner of the two SSS transmissions, and the first symbol of the subframe 0 can be regarded as the frame header of the radio frame, that is, Start point.
  • the radio frame timing taking the radio frame timing as an example, the radio frame timing, the radio frame number, and the radio frame timing, the radio frame number, and the candidate transmission timing of the second synchronization signal may also be used.
  • Corresponding relationship determines a candidate transmission time of the second synchronization signal.
  • the radio frame timing information is obtained, and the radio frame number is used, for example, the second synchronization signal is to be sent at some candidate transmission moments near the 50th, 150th, and 250th radio frames, then
  • the radio frame timing information and the radio frame number determine the location of the 50th, 150th, and 250th radio frames, and the position of the candidate transmission timing of the second synchronization signal can be determined.
  • the candidate transmission time of the second synchronization signal is determined, for example, some candidate transmission moments in the vicinity of the 50, 150, 250... wireless frame, and the transmission timing of the second synchronization signal may be selected at the candidate moments. Specifically, it may be considered to avoid the transmission timing of the second synchronization signal of other cells.
  • the receiving method performed by the UE includes:
  • the UE may acquire the radio frame number information from the physical broadcast channel.
  • the UE may also obtain the information through other broadcast channels, such as system information blocks.
  • the correspondence between the two and the candidate detection time of the second synchronization signal is determined, and the correspondence may be predefined or may be performed by the base station. Configured for the UE.
  • the correspondence may be a candidate detection time in the 50th, 150th, and 250th wireless frames. Nearly, the transmission period is 100ms. Since the UE can determine the start and end points of the radio frame by radio frame timing, the order of the radio frames can be obtained by the radio frame number, so the UE can determine the location of the 4 selection detection time.
  • the SSS is detected to obtain the SSS.
  • sss can be detected at the candidate detection time.
  • the SSS can carry the cell identifier or the cell group identifier. Therefore, the UE can obtain the cell identifier or the cell group identifier carried in the SSS.
  • the PSS and the SSS may be located in the first serving cell, and the second synchronization signal may be located in the second serving cell.
  • the UE may read the PSS and the SSS. And other broadcast channels, first accessing the first serving cell, and then, with the assistance of the first serving cell, for example, the first serving cell notifies the location of the second synchronization signal on the second serving cell of the UE, specifically through the radio frame No., the correspondence between the radio frame timing and the second synchronization signal candidate detection time, where it is assumed that the first and second serving cells are synchronized serving cells, so that the UE can determine the location of the second synchronization signal on the second serving cell, without using The UE itself detects the second synchronization signal at each moment on the second serving cell, which reduces the UE detection complexity.
  • the embodiment of the present invention further provides a base station 1, as shown in FIG. 8, including:
  • the information determining unit 10 is configured to determine transmission information of the first group of synchronization signals, the first group of synchronization signals includes at least one synchronization signal, and the time determination unit 11 is configured to determine the second synchronization signal according to the transmission information determined by the information determining unit 10. Sending time
  • the sending unit 12 is configured to send the second synchronization signal according to the sending moment of the second synchronization signal determined by the time determining unit 11.
  • the time determining unit 11 can determine the sending time of the second synchronization signal by using the sending information of the first group of synchronization signals, and send a single
  • the element 12 transmits the second synchronization signal at these transmission moments. Therefore, the base station 1 can implement interference coordination with other cells by selecting the transmission timing of the second synchronization signal, and can prevent the base station from transmitting the second synchronization simultaneously with multiple other cells.
  • the signal is used to effectively reduce the interference generated by the base station and other cells when transmitting the second synchronization signal.
  • a sending period of the second synchronization signal may be greater than a sending period of the at least one synchronization signal of the first group of synchronization signals.
  • the transmission timing of the second synchronization signal is different from the transmission timing of the second synchronization signal transmitted by at least one of the other cells.
  • the time determining unit 1 1 may determine the candidate sending time of the second synchronization signal in the following three manners, as follows:
  • the time determination unit 11 may determine the candidate transmission time of the second synchronization signal according to the transmission information determined by the information determination unit 10; in the determined candidate transmission time, select some or all of the candidate transmission times as the second synchronization signal.
  • Send time For example, the time determining unit 1 1 may determine the candidate sending of the second synchronization signal according to the sending information determined by the information determining unit and the correspondence between the sending information and the candidate sending time of the second synchronization signal. time.
  • the time determining unit 1 1 may determine the sending time of the second synchronization signal according to the sending information determined by the information determining unit and the correspondence between the sending information and the sending time of the second synchronization signal.
  • the time determining unit 1 1 may first determine a candidate transmission time of the second synchronization signal, and then select some or all candidate transmission times as the second synchronization signal according to the transmission information determined by the information determining unit. time.
  • the first group of synchronization signals includes a first synchronization signal
  • the transmission information of the first group of synchronization signals determined by the information determining unit 10 includes a transmission sequence of the first synchronization signal, a transmission period, At least one of the sending moments.
  • the first synchronization signal may be a primary synchronization signal
  • the second synchronization signal may be a secondary synchronization signal.
  • they may also be other synchronization signals, and the present invention does not do this. Limited.
  • the first group of synchronization signals includes at least two synchronization signals
  • the transmission information of the first group of synchronization signals determined by the information determining unit 10 includes at least the first group of synchronization signals.
  • the at least two synchronization signals included in the first group of synchronization signals include a primary synchronization signal and a secondary synchronization signal
  • the transmission information of the first group of synchronization signals determined by the information determining unit 10 includes a primary synchronization signal and a sub-synchronization signal.
  • Frame and/or radio frame timing information may be sent by using the same cell
  • the first group of synchronization signals and the second synchronization signal may be sent by the same or different cells.
  • the embodiment of the present invention further provides a base station 2, as shown in FIG. 9, including: a processor 20, a communication interface 21, a memory 22, and a bus 23;
  • the processor 20, the communication interface 21, and the memory 22 complete communication with each other through the bus 23;
  • a communication interface 21 configured to communicate with an external device of the base station 2;
  • the memory 22 is used to store the program 221 ;
  • the processor 20 is configured to execute the program 221 stored in the memory 22; wherein the program 221 includes: an information determining unit, configured to determine transmission information of the first group of synchronization signals, where the first group of synchronization signals includes at least one synchronization signal; a determining unit, configured to determine, according to the sending information determined by the information determining unit, a sending moment of the second synchronization signal; and a sending unit, configured to: according to the second synchronization signal determined by the time determining unit The second synchronization signal is transmitted at the time of transmission.
  • the functional units in the embodiment shown in FIG. 8 are included in the program. For the specific working manner of each functional unit, refer to the embodiment described in FIG. 8 and the foregoing embodiment of the method for transmitting a synchronization signal. I will not repeat them here.
  • the base station 2 can determine the transmission timing of the second synchronization signal by using the transmission information of the first group of synchronization signals, and send the second synchronization signal at these transmission moments. Therefore, the base station 2 can select the second synchronization.
  • the interference coordination with other cells is implemented, and the base station and the plurality of other cells can be prevented from simultaneously transmitting the second synchronization signal, thereby effectively reducing the interference generated by the base station and other cells when transmitting the second synchronization signal.
  • the UE can effectively improve the possibility that the UE detects the second synchronization signal, thereby effectively improving the detection performance of the UE.
  • the embodiment of the present invention further provides a base station 3, as shown in FIG. 10, including the processor 30 and the memory 31, and each of the embodiments shown in FIG.
  • the functional unit is included in the processor 30, and the specific working mode of each functional unit is shown in the embodiment of FIG. 8 and the foregoing method for transmitting the synchronization signal, and details are not described herein again.
  • the base station 3 can determine the transmission timing of the second synchronization signal by using the transmission information of the first group of synchronization signals, and send the second synchronization signal at the transmission moments. Therefore, the base station 2 can select the second synchronization.
  • the interference coordination with other cells is implemented, and the base station and the plurality of other cells can be prevented from simultaneously transmitting the second synchronization signal, thereby effectively reducing the interference generated by the base station and other cells when transmitting the second synchronization signal.
  • the UE can effectively improve the possibility that the UE detects the second synchronization signal, thereby effectively improving the detection performance of the UE.
  • the method further includes:
  • the first set of synchronization signals includes only a first synchronization signal, such as a primary synchronization signal; and the second synchronization signal is, for example, a secondary synchronization signal.
  • the combination of the first synchronization signal and the second synchronization signal is referred to as a second group of synchronization signals.
  • the second set of synchronization signals are different in position of the first field and the second field of the radio frame.
  • the first field is a subframe 0 to 4 of a radio frame
  • the second field is subframes 5 through 9 of a radio frame.
  • the UE can determine the carrier type and/or frame timing information according to the second set of synchronization signals at different positions of the two fields.
  • the carrier type includes a backward compatible carrier and a new carrier because the PS S and SSS on the backward compatible carrier are the same in both half frames and different on the new carrier.
  • the new carrier is generally non-backward compatible, that is, the lower version of the UE may not be accessed by the new carrier, nor may it be camped on the new carrier; the feature of the new carrier may also include the following At least one of the following: the common carrier on the new carrier receives the common control information, such as the scheduling system message, the paging message, the ePDCCH of the random access response message, the ePDCCH is precoded and transmitted by the channel information, and the resource is allocated by the physical resource.
  • the block or physical resource block pair is a unit; the cell-specific reference signal on the new carrier is not transmitted every subframe, for example, 5 subframes are transmitted; only the transmission module based on the UE-specific reference signal is supported on the new carrier; specifically:
  • the relative positional relationship between the primary synchronization signal and the secondary synchronization signal in the second group of synchronization signals is the same in the first field and the second field, for example, the symbols of the primary synchronization signal and the secondary synchronization signal are adjacent and the primary synchronization signal After the time is up, the other does not rule out.
  • the second set of sync signals differ in absolute time domain positions of the two fields, such as different symbol positions and/or sub-frame positions.
  • An example that satisfies the above conditions is: PS S and SSS are respectively located in the second symbol and the third symbol of subframe 0 of the first field, and PSS and SSS are respectively located in the third of subframe 5 of the second field. Symbols and the fourth symbol, other similar positions are not excluded.
  • the frame timing can be determined by comparing different time intervals of the second group of synchronization signals of the two fields, for example, if the UE detects the previous field.
  • the second group of synchronization signals is separated from the second group of synchronization signals of the next field by a symbol of 5 subframes, and the UE determines that the previous field is the first field of a radio frame, and the latter half
  • the frame is the second field of a radio frame; conversely, if the UE detects that the second group of synchronization signals of the previous field is separated from the second group of synchronization signals of the next field by 5 subframes but one symbol less, Then the UE determines that the previous field is the second field of a radio frame, and the latter field is the first field of a radio frame.
  • the UE may also determine the carrier type by a similar method as described above, that is, by the positional relationship of the second group of synchronization signals of the two fields.
  • the relative positional relationship between the primary synchronization signal and the secondary synchronization signal in the second group of synchronization signals is different in the first field and the second field, for example, PS S and SSS are respectively located in the subframe 0 of the first field.
  • the 2nd symbol and the 3rd symbol, PS S and SSS are respectively located in the 2nd symbol and the 4th symbol of the subframe 5 of the second field.
  • Other positions are not excluded from the symbol position, or the subframe positions may be different.
  • the second group of synchronization signals occupy different subframes in two fields.
  • the UE can obtain a frame synchronization signal, and/or carrier type information, and can ensure that the UE detects a set of PSS and SSS methods and existing mechanisms, that is, The mechanism on the string-compatible carrier is the same, because the relative position of the PSS and SSS can remain unchanged, which can greatly reduce the complexity of the cell search.
  • the embodiment of the present invention further provides a UE4, as shown in FIG. 11, including: a detecting unit 40, configured to detect the first group of synchronization signals to obtain the first group.
  • a synchronization signal configured to detect the first group of synchronization signals to obtain the first group.
  • a synchronization signal the first set of synchronization signals includes at least one synchronization signal;
  • a timing determining unit 41 configured to determine a detection timing of the second synchronization signal according to the transmission information of the first group of synchronization signals;
  • the detecting unit 40 is further configured to detect the second synchronization signal to acquire the second synchronization signal at the detection timing determined by the timing determining unit 41.
  • the UE4 may determine the detection time of the second synchronization signal by using the transmission information of the first synchronization signal, and detect the second synchronization signal at the detection time of the second synchronization signal, thereby enabling the base station to select the
  • the interference of the second synchronization signal can be coordinated with other cells to prevent the base station from transmitting the second synchronization signal simultaneously with the multiple other cells, thereby effectively reducing the interference generated by the base station and other cells when transmitting the second synchronization signal.
  • the UE 4 can determine the detection timing of the second synchronization signal, and detect the second synchronization signal at these detection times. Therefore, the possibility that the UE 4 detects the second synchronization signal can be effectively improved, thereby effectively improving the detectability of the UE.
  • the transmission period of the second synchronization signal is greater than the transmission period of the at least one synchronization signal of the first group of synchronization signals.
  • the time determining unit 41 may determine the candidate moments of the second synchronization signal in the following two manners, as follows:
  • the time determining unit 41 may determine the detection time of the second synchronization signal according to the transmission information and the correspondence between the transmission information and the detection time of the second synchronization signal.
  • the time determination unit 41 may first determine the candidate detection time of the second synchronization signal; and then, according to the transmission information, select some or all of the candidate detection times as the detection time of the second synchronization signal.
  • the time determining unit 41 may be configured to: select, according to the correspondence between the sending information and the candidate detection time of the second synchronization signal, a partial candidate detection time corresponding to the sending information as the second synchronization signal. Detection time.
  • the second synchronization signal may be sent at all or part of the detection time.
  • the first group of synchronization signals includes a first synchronization signal
  • the transmission information of the first group of synchronization signals includes a transmission sequence, a transmission period, and a transmission time of the first synchronization signal.
  • the sending information of the first group of synchronization signals includes a sending period of the first synchronization signal.
  • the UE in this embodiment further includes:
  • the obtaining unit 42 is configured to acquire a sending period of the first synchronization signal, where a sending period of the first synchronization signal is preset, or a sending period of the first synchronization signal is acquired according to the first synchronization signal acquired by the detecting unit 40.
  • the transmission information of the first group of synchronization signals includes a transmission sequence of the first synchronization signal and/or a transmission timing of the first synchronization signal.
  • the obtaining unit 42 is configured to acquire a transmission period of the first synchronization signal, where the transmission period of the first synchronization signal is preset, or the transmission period of the first synchronization signal is acquired according to the first synchronization signal acquired by the detecting unit 40.
  • at least two determined detection moments are included between transmission timings of two adjacent first synchronization signals, where the at least two detection moments include a first detection moment and a Second detection time; At this time, the detecting unit 40 is specifically used to:
  • the number of sequences in the first sequence set and the second sequence set At least one of the number of sequences is smaller than a total number of cell identifiers or a total number of cell group identifiers that the second synchronization signal needs to indicate.
  • the sequence in the first sequence set is the same as the sequence in the second sequence set.
  • the first group of synchronization signals includes a first synchronization signal.
  • the UE further provided by the embodiment further includes: a synchronization unit 43 configured to: according to the first synchronization signal, Perform symbol synchronization, sub-frame synchronization and radio frame synchronization.
  • the first synchronization signal may be a primary synchronization signal
  • the second synchronization signal may be a secondary synchronization signal.
  • the first group of synchronization signals includes at least two synchronization signals
  • the transmission information of the first group of synchronization signals includes a subframe and a signal indicated by at least one of the first group of synchronization signals. / or radio frame timing information;
  • the detecting unit 40 is specifically configured to: respectively detect the at least two synchronization signals of the first group of synchronization signals to obtain the at least two synchronization signals.
  • the UE in this embodiment further includes:
  • the obtaining unit 44 is configured to acquire a radio frame number from the broadcast channel, and acquire, by detecting at least one synchronization signal in the first group of synchronization signals, a subframe indicated by at least one synchronization signal in the first group of synchronization signals and/or Or radio frame timing information; at this time, the time determining unit 41 is specifically configured to:
  • the detection time of the second synchronization signal is determined by the correspondence between the frame and/or the radio frame timing information and the detection timing of the second synchronization signal.
  • the at least two synchronization signals included in the first group of synchronization signals include a primary synchronization signal and a secondary synchronization signal;
  • the transmission information of the first group of synchronization signals includes a subframe and/or a radio frame indicated by the primary synchronization signal and the secondary synchronization signal. Timing information.
  • the first group of synchronization signals may be sent by the same cell, and the first group of synchronization signals and the second synchronization signal may be sent by the same or different cells.
  • the embodiment of the present invention further provides a UE 5, as shown in FIG. 15, including a processor 50, a communication interface 5 1 , a memory 52 and a bus 53 ; 50, the communication interface 5 1, the memory 52 through the bus 53 to complete mutual communication;
  • a communication interface 5 1 configured to communicate with an external device of the UE 5;
  • the processor 50 is configured to execute the program stored in the memory 52.
  • the program 521 includes:
  • a detecting unit configured to detect a first group of synchronization signals to obtain a first group of synchronization signals, wherein the first group of synchronization signals includes at least one synchronization signal; and a timing determining unit, configured to send information according to the first group of synchronization signals Determining a detection timing of the second synchronization signal;
  • the detecting unit is further configured to detect the second synchronization signal to acquire a second synchronization signal at a detection time determined by the timing determining unit.
  • the functional units in the embodiment shown in FIG. 11 to FIG. 14 can be included in the program.
  • the specific working manner of each functional unit please refer to the embodiment described in FIG. 11 to FIG. 14 and the foregoing.
  • An embodiment of a method for transmitting a synchronization signal is not described herein.
  • the UE5 provided by the embodiment of the present invention may send information of the first synchronization signal.
  • the base station can be prevented from simultaneously transmitting the second synchronization signal with multiple other cells, thereby effectively reducing the interference generated by the base station and other cells when transmitting the second synchronization signal, and the UE5 can determine the detection timing of the second synchronization signal, and in these detections.
  • the second synchronization signal is detected at a time, so that the possibility that the UE 5 detects the second synchronization signal can be effectively improved, thereby effectively improving the detection performance of the UE.
  • the embodiment of the present invention further provides a UE6, as shown in FIG. 16, including the processor 60 and the memory 61, and the embodiment shown in FIG. 11 to FIG.
  • the functional units are included in the processor 60.
  • For the specific working mode of each functional unit refer to the embodiment shown in FIG. 11 to FIG. 14 and the foregoing method for transmitting the synchronization signal, and details are not described herein again.
  • the UE6 may determine the detection time of the second synchronization signal by using the transmission information of the first synchronization signal, and detect the second synchronization signal at the detection time of the second synchronization signal, thereby enabling the base station to select the
  • the interference of the second synchronization signal can be coordinated with other cells to prevent the base station from transmitting the second synchronization signal simultaneously with the multiple other cells, thereby effectively reducing the interference generated by the base station and other cells when transmitting the second synchronization signal.
  • the UE6 can determine the detection time of the second synchronization signal, and detect the second synchronization signal at the detection time, so that the possibility that the UE 6 detects the second synchronization signal can be effectively improved, thereby effectively improving the detection performance of the UE.
  • the method further includes:
  • the first set of synchronization signals includes only a first synchronization signal, such as a primary synchronization signal; and the second synchronization signal is, for example, a secondary synchronization signal.
  • the combination of the first synchronization signal and the second synchronization signal is referred to as a second group of synchronization signals.
  • the second set of synchronization signals are different in position of the first field and the second field of the radio frame.
  • the first field is a subframe 0 to 4 of a radio frame
  • the second field is a subframe 5 to 9 of a radio frame.
  • the sync signal is at different locations in the two fields to determine carrier type and/or frame timing information.
  • the carrier type includes a backward compatible carrier and a new carrier because of the backward compatible carrier
  • PS S and S S S are the same in both fields and different on the new carrier.
  • the new carrier is generally non-backward compatible, that is, the lower version of the UE may not be accessed by the new carrier, nor may it be camped on the new carrier; the feature of the new carrier may also include the following At least one of the following: the common carrier on the new carrier receives the common control information, such as the scheduling system message, the paging message, the ePDCCH of the random access response message, the ePDCCH is precoded and transmitted by the channel information, and the resource is allocated by the physical resource.
  • the block or physical resource block pair is a unit; the cell-specific reference signal on the new carrier is not transmitted every subframe, for example, 5 subframes are transmitted; only the transmission module based on the UE-specific reference signal is supported on the new carrier; specifically:
  • the relative positional relationship between the primary synchronization signal and the secondary synchronization signal in the second group of synchronization signals is the same in the first field and the second field, for example, the symbols of the primary synchronization signal and the secondary synchronization signal are adjacent and the primary synchronization signal After the time is up, the other does not rule out.
  • the second set of sync signals differ in absolute time domain positions of the two fields, such as different symbol positions and/or sub-frame positions.
  • An example that satisfies the above conditions is: PS S and SSS are respectively located in the second symbol and the third symbol of subframe 0 of the first field, and PSS and SSS are respectively located in the third of subframe 5 of the second field. Symbols and the fourth symbol, other similar positions are not excluded.
  • the frame timing can be determined by comparing different time intervals of the second group of synchronization signals of the two fields, for example, if the UE detects the previous field.
  • the second group of synchronization signals is separated from the second group of synchronization signals of the next field by a symbol of 5 subframes, and the UE determines that the previous field is the first field of a radio frame, and the latter half
  • the frame is the second field of a radio frame; conversely, if the UE detects that the second group of synchronization signals of the previous field is separated from the second group of synchronization signals of the next field by 5 subframes but one symbol less, Then the UE determines that the previous field is the second field of a radio frame, and the latter field is the first field of a radio frame.
  • the UE may also determine the carrier type by a similar method as described above, that is, by the positional relationship of the second group of synchronization signals of the
  • the relative of the primary synchronization signal and the secondary synchronization signal in the second group of synchronization signals The positional relationship is different between the first field and the second field.
  • the PSS and the SSS are respectively located in the second symbol and the third symbol of the subframe 0 of the first field, and the PSS and the SSS are respectively located in the second field.
  • Other positions are not excluded from the symbol position, or the subframe positions may be different.
  • the second group of synchronization signals occupy different subframes in two fields.
  • the method for determining the frame timing and/or the carrier type is the same as the above embodiment, and details are not described herein again.
  • the UE can obtain a frame synchronization signal, and/or carrier type information, and can ensure that the UE detects a set of PSS and SSS methods and existing mechanisms, that is, The mechanism on the string-compatible carrier is the same, because the relative position of the PSS and SSS can remain unchanged, which can greatly reduce the complexity of the cell search.

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Abstract

本发明的实施例提供了一种同步信号的发送、接收方法和装置,涉及通信技术领域,为有效提高UE对同步信道的检测性能而发明。所述同步信号的接收方法,包括:检测第一组同步信号以获取第一组同步信号,所述第一组同步信号中包括至少一个同步信号;根据所述第一组同步信号的发送信息,确定所述第二同步信号的检测时刻;在所述确定的检测时刻,检测所述第二同步信号以获取第二同步信号。本发明可用于LTE无线通信系统中。

Description

同步信号的发送、 接收方法和装置 技术领域 本发明涉及通信技术领域, 尤其涉及一种同步信号的发送、 接 收方法和装置。 背景技术
对于长期演进 LTE ( Long Term Evolution ) 系统, 用户设备 UE ( User Equipment )在接入 LTE系统时, 需要识别小区进而接入 小区。 所谓识别小区是指, UE通过检测同步信道进行与小区的同 步并获取该小区的物理小区标识, 进而对该小区进行测量等操作。 在进行与小区的同步时, UE—般首先检测主同步信号, 或称主同 步序歹1 J PSS ( Primary Synchronization Sequence ) , 然后检测辅同步 信号,或称辅同步序歹1 J SSS ( Secondary Synchronization Sequence ), 以做到时频初始同步, 即符号同步, 子帧同步和帧同步。 现有技术中, PSS和 SSS的发送周期通常为 5个子帧, 且基站 发送 PSS和 SSS的时域位置固定, 对于频分双工 FDD ( Frequency Division Duplexing ) 系统, PSS位于一个无线帧的第 1和第 6个子 帧的第一个时隙的最后一个符号, SSS位于一个无线帧的第 1和第 6个子帧的第一个时隙的倒数第 2个符号;对于时分双工 TDD( Time Division Duplexing ) 系统, PSS位于一个无线帧的第 2和第 7个子 帧的第一个时隙的第 3个符号, SSS位于一个无线帧的第 1和第 6 个子帧的第二个时隙的最后一个符号。 随着技术的进步和用户需求的不断增加, LTE系统的应用场景 趋向于密集部署, 即场景中密集部署大量的基站, 这些基站中包括 宏基站和微基站。 由于部署密集, 基站之间的干扰会非常严重, 尤 其是微基站之间, 因此, 干扰将导致 UE对同步信道的检测性能降 低, UE可能无法正常检测到各小区的同步信道而无法识别小区。
发明内容 本发明的实施例的主要目 的在于, 提供一种同步信号的发送、 接收方法和装置, 能够有效提高 UE对同步信道的检测性能。
为达到上述目的, 本发明的实施例采用如下技术方案: 第一方面, 提供一种同步信号的发送方法, 包括:
确定第一组同步信号的发送信息,所述第一组同步信号包括至 少一个同步信号;
根据所述发送信息确定第二同步信号的发送时刻;
根据所述第二同步信号的发送时刻发送所述第二同步信号。
第二方面, 提供一种同步信号的接收方法, 包括:
检测第一组同步信号以获取第一组同步信号,所述第一组同步 信号中包括至少一个同步信号;
根据所述第一组同步信号的发送信息,确定所述第二同步信号 的检测时刻; 在所述确定的检测时刻,检测所述第二同步信号以获取第二同 步信号。
第三方面, 提供一种基站, 包括: 信息确定单元, 用于确定第一组同步信号的发送信息, 所述第 一组同步信号包括至少一个同步信号; 时刻确定单元,用于根据所述信息确定单元确定的发送信息确 定第二同步信号的发送时刻; 发送单元,用于根据所述时刻确定单元确定的第二同步信号的 发送时刻发送所述第二同步信号。
第四方面, 提供一种 UE , 包括: 检测单元, 用于检测第一组同步信号以获取第一组同步信号, 所述第一组同步信号中包括至少一个同步信号; 时刻确定单元, 用于根据所述第一组同步信号的发送信息, 确 定所述第二同步信号的检测时刻;
所述检测单元还用于在所述时刻确定单元确定的检测时刻,检 测所述第二同步信号以获取第二同步信号。
第五方面, 提供一种基站, 包括:
处理器, 通信接口, 存储器和总线;
其中, 处理器、通信接口、存储器通过总线完成相互间的通信; 所述通信接口, 用于与外部设备通信;
所述存储器, 用于存放程序;
所述处理器, 用于执行所述程序; 其中, 所述程序包括: 信息确定单元, 用于确定第一组同步信号的发送信息, 所述第 一组同步信号包括至少一个同步信号; 时刻确定单元,用于根据所述信息确定单元确定的发送信息确 定第二同步信号的发送时刻; 发送单元,用于根据所述时刻确定单元确定的第二同步信号的 发送时刻发送所述第二同步信号。
第六方面, 提供一种 UE , 包括:
处理器, 通信接口, 存储器和总线;
其中, 处理器、通信接口、存储器通过总线完成相互间的通信; 所述通信接口, 用于与外部设备通信;
所述存储器, 用于存放程序;
所述处理器, 用于执行所述程序; 其中, 所述程序包括: 检测单元, 用于检测第一组同步信号以获取第一组同步信号, 所述第一组同步信号中包括至少一个同步信号; 时刻确定单元, 用于根据所述第一组同步信号的发送信息, 确 定所述第二同步信号的检测时刻;
所述检测单元还用于在所述时刻确定单元确定的检测时刻,检 测所述第二同步信号以获取第二同步信号。
本发明实施例提供的同步信号的发送方法、 接收方法、 基站和
UE , 通过第一组同步信号的发送信息, 确定出第二同步信号的发 送时刻, 基站在这些发送时刻发送第二同步信号, 而 UE可以通过 第一同步信号的发送信息确定出第二同步信号的检测时刻,并在第 二同步信号的检测时刻检测第二同步信号, 因此, 基站可以通过选 择第二同步信号的发送时刻而实现与其他小区之间的干扰协调, 而 UE 能够确定出第二同步信号的检测时刻, 并在这些检测时刻检测 第二同步信号, 因此能够有效提高 UE检测到第二同步信号的可能 性, 进而有效提高 UE的检测性能。
附图说明 为了更清楚地说明本发明实施例的技术方案,下面将对实施例 描述中所需要使用的附图作简单地介绍, 显而易见地, 下面描述中 的附图仅仅是本发明的一些实施例, 对于本领域普通技术人员来 讲, 在不付出创造性劳动性的前提下, 还可以根据这些附图获得其 他的附图。 图 1 为本发明实施例提供的同步信号的发送方法的一种流程 图;
图 2 为本发明实施例提供的同步信号的接收方法的一种流程 图;
图 3 为本发明实施例提供的同步信号的发送方法的一种流程 图;
图 4 为图 3 所述发送方法中的 SS S 的候选发送时刻的示例性 示意图;
图 5 为本发明实施例提供的同步信号的接收方法的一种流程 图;
图 6 为本发明实施例提供的同步信号的发送方法的一种流程 图;
图 7 为本发明实施例提供的同步信号的接收方法的一种流程 图;
图 8为本发明实施例提供的基站的一种结构框图;
图 9为本发明实施例提供的基站的一种结构框图;
图 10为本发明实施例提供的基站的一种结构框图;
图 1 1 为本发明实施例提供的 UE的一种结构框图;
图 12为本发明实施例提供的 UE的一种结构框图; 图 13为本发明实施例提供的 UE的一种结构框图;
图 14为本发明实施例提供的 UE的一种结构框图; 图 15为本发明实施例提供的 UE的一种结构框图; 图 16为本发明实施例提供的 UE的一种结构框图。
具体实施方式 下面将结合本发明实施例中的附图,对本发明实施例中的技术 方案进行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明 一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本 领域普通技术人员在没有做出创造性劳动前提下所获得的所有其 他实施例, 都属于本发明保护的范围。
应理解, 本发明的技术方案可以应用于各种通信系统, 例如: 全球移动通讯 ( GSM , Global System of Mobile communication ) 系 统、 码分多址 ( CDMA, Code Division Multiple Access ) 系统、 宽 带码分多址 ( WCDMA, Wideband Code Division Multiple Access ) 系统、 通用分组无线业务 ( GPRS, General Packet Radio Service ), 长期演进 ( LTE, Long Term Evolution ) 系统、 先进的长期演进 ( LTE- A, Long term evolution-Advanced ) 系统、 通用移动通信系 统 ( UMTS, Universal Mobile Telecommunication System ) 等, 本 发明实施例并不限定, 但为描述方便, 本发明实施例将以 LTE 网 络为例进行说明。 本发明实施例可以用于不同的制式的无线网络。无线接入网络 在不同 的 系统中可包括不同 的网元。 例如, LTE ( Long Term Evolution, 长期演进 ) 和 LTE-A ( Long term evolution- Advanced , 先进的长期演进) 中无线接入网络的网元包括 eNB ( eNodeB, 演 进型基站), WCDMA ( Wideband Code Division Multiple Access, 宽带码分多址) 中无线接入网络的网元包括 RNC ( Radio Network Controller,无线网络控制器)和 NodeB,类似地, WiMax( Worldwide Interoperability for Microwave Access, 全球微波互联接入 )等其他 无线网络也可以使用与本发明实施例类似的方案,只是基站系统中 的相关模块可能有所不同,本发明实施例并不限定,但为描述方便, 下述实施例将以网络侧设备为例进行说明。
还应理解,在本发明实施例中,用户设备( UE, User Equipment ) 包括但不限于移动台 ( MS, Mobile Station ), 移动终端 ( Mobile Terminal ), 移动电话 ( Mobile Telephone ), 手机 ( handset ) 及便 携设备 ( portable equipment ) 等, 该用户设备可以经无线接入网 ( RAN, Radio Access Network) 与一个或多个核心网进行通信, 例如, 用户设备可以是移动电话 (或称为"蜂窝"电话)、 具有无线 通信功能的计算机等, 用户设备还可以是便携式、袖珍式、 手持式、 计算机内置的或者车载的移动装置。
在本发明实施例中, 基站, 可以是 GSM 系统、 GPRS 系统或 CDMA系统中的基站 ( Base Transceiver Station, BTS ), 还可以是 CDMA2000 系统或 WCDMA系统中的基站( NodeB ),还可以是 LTE 系统中的演进型基站( Evolved NodeB, eNodeB ),还可以是 WiMAX 网络中 的接入服务网络的基站 ( Access Service Network Base Station , ASN BS ) 等网元。
另外, 本文中术语"和 /或", 仅仅是一种描述关联对象的关联 关系, 表示可以存在三种关系, 例如, A 和 /或 B , 可以表示: 单 独存在 A , 同时存在 A和 B , 单独存在 B这三种情况。 另外, 本 文中字符" /" , 一般表示前后关联对象是一种"或"的关系。 本发明实施例提供了一种同步信号的发送方法, 由基站执行, 如图 1 所示, 包括下列步骤:
100 , 基站确定第一组同步信号的发送信息。 本发明实施例中, 第一组同步信号中包括至少一个同步信号。 本步骤中,第一组同步信号的发送信息是基站发送第一组同步 信号的过程中所采用的发送参数或者通过第一组同步信号的发送 所指示的信息。 需要说明的是, 第一组同步信号的发送信息可以是 第一组同步信号中的一个或几个同步信号对应的发送参数,也可以 是通过第一组同步信号中的某一个同步信号所指示的信息,或者通 过第一组同步信号中的至少两个同步信号共同指示的信息。 举例而言, 在本发明的一个实施例中, 第一组同步信号中包括 第一同步信号,第一组同步信号的发送信息包括第一同步信号的发 送序列、 发送周期、 发送时刻中的至少一种。 在本发明的另一个实施例中,第一组同步信号包括至少两个同 步信号, 这种情况下, 第一组同步信号的发送信息可以是第一组同 步信号中的至少两个同步信号中的一个或几个同步信号的发送序 列、 发送周期、 发送时刻、 或上述三者中的至少二者, 第一组同步 信号的发送信息还可以是第一组同步信号中至少一个同步信号指 示的子帧和 /或无线帧定时信息。 其中, 子帧定时信息是指子帧的 起始和结束点,无线帧定时信息是指无线帧的起始和结束点。例如, 假设第一组同步信号包括 S SS , SS S在一个无线帧中的子帧 0和子 帧 5各发送一次, 且这两次发送的序列的交织方式不同, 因此 UE 可以从这两次 S SS发送的交织方式来区分哪一个是子帧 0 , 哪一个 是子帧 5 , 子帧 0的第一个符号就可以看做是无线帧的帧头, 即起 始点。
102 , 基站根据其确定的发送信息确定第二同步信号的发送时 刻。
需要说明的是, 本发明实施例中, 第二同步信号对于 UE而言 是用于进行小区识别的,如果 UE能够正常的检测到第二同步信号, 就能够识别小区并接入小区。 本发明实施例中,基站通过第一组同步信号的发送信息来确定 出第二组同步信号的发送时刻,基站在已知第一组同步信号的发送 信息后, 能够确定出第二同步信号的发送时刻。
特别的, 本步骤中, 基站在确定第二同步信号的发送时刻时, 为了有效降低与各小区之间在发送第二同步信号时所产生的干扰, 基站可以选择其第二同步信号的发送时刻与其他小区中的至少一 个小区发送的第二同步信号的发送时刻不同,这样可以避免基站与 多个其他小区同时发送第二同步信号,从而有效降低基站和其他小 区在发送第二同步信号时所产生的干扰, 进一步提高 UE对第二同 步信号的接收性能。
在现行的 LTE标准中, 各同步信号的发送周期通常是相同的 , 而在本发明实施例中, 特别的, 基站在确定第二同步信号的发送时 刻时,可使第二同步信号的发送周期相对于其在现行标准中规定的 发送周期变大, 即拉长了第二同步信号的发送周期, 也就是说, 本 步骤中, 基站在确定第二同步信号的发送时刻时, 可使得第二同步 信号的发送周期大于第一组同步信号中至少一个同步信号发送周 期, 例如, 在本发明的一个实施例中, 基站以及其他小区所确定的 第二同步信号的发送时刻为现行标准规定的第二同步信号的发送 时刻中的时刻, 但第二同步信号的发送周期拉长, 即基站所确定的 第二同步信号的发送时刻为现行标准规定的第二同步信号的发送 时刻中的部分时刻,从而减少了基站与其他小区同时发送第二同步 信号的可能性,从而有效降低基站和其他小区在发送第二同步信号 时所产生的干扰, 进一步提高 UE对第二同步信号的接收性能。 可选的, 本步骤可有如下三种实现方式: 其一:
基站首先根据第一组同步信号的发送信息确定第二同步信号 的候选发送时刻; 然后, 在确定的候选发送时刻中, 选择部分或全 部候选发送时刻作为第二同步信号的发送时刻。
基站在确定候选发送时刻时,可具体根据第一组同步信号的发 送信息,以及该发送信息与第二同步信号的候选发送时刻的对应关 系, 确定第二同步信号的候选发送时刻。 顾名思义,第二同步信号的候选发送时刻是指可以发送第二同 步信号的所有时刻,每个候选发送时刻可以是一个或连续的几个正 交频分复用 OFDM ( Orthogonal Frequency Division Multiplexing ) 符号, 还可以是一个或连续多个子帧, 或者, 还可以是离散的几个 符号, 这几个离散的符号分别位于不同的子帧或时隙上。 基站可以 选择这些候选发送时刻中的全部或部分时刻作为第二同步信号的 发送时刻。 如前, 在通信网络中, 多个小区的第二同步信号的候选 发送时刻相同时,基站可以选择在候选发送时刻中的部分时刻发送 第二同步信号, 这样, 第二同步信号的发送周期可以较长, 便于候 选发送时刻相同的不同小区之间进行干扰规避。
在这种实现方式中, 无论对于基站而言, 还是对于 UE而言, 第一组同步信号的发送信息与第二同步信号的候选发送时刻的对 应关系是预先设定好的,在已知第一组同步信号的发送信息的情况 下, 基站和 UE均能根据预先设定好的对应关系, 确定出第二同步 信号的候选发送时刻, UE将在这些候选发送时刻检测第二同步信 号以获取第二同步信号。 这样, 由于 UE能够已知第二同步信号的 候选发送时刻, 而且, 第二同步信号发送在这些候选发送时刻中的 某些时刻, UE 只需在确定的候选发送时刻进行第二同步信号的检 测, 降低了检测的复杂度。 基于这种实现方式, 对于通信网络中不同小区而言, 各小区可 以分别选择不同的发送时刻发送第二同步信号,从而有效降低各小 区之间在发送第二同步信号时所产生的干扰, 进一步提高 UE对第 二同步信号的接收性能。 在本发明的一个实施例中,通信网络中各小区的第二同步信号 的候选发送时刻相同, 在这种情况下, 各小区可以进行干扰协调, 本步骤中,基站可以选择与通信网络中其他小区中至少一个小区不 同的候选发送时刻作为第二同步信号的发送时刻,从而有效降低基 站与其他小区之间在发送第二同步信号时所产生的干扰,进一步提 高 UE对第二同步信号的接收性能。 本发明实施例对第一组同步信号的发送信息与第二同步信号 的候选发送时刻的对应关系不做限定, 只要基站和 UE能够根据该 对应关系确定出第二同步信号的候选发送时刻即可。 具体的, 每一种发送信息可对应一种候选发送时刻的集合, 它 们可以直接对应,即每一种发送信息直接对应着一种候选发送时刻 的集合, 已知发送信息后, 不需要进一步的计算, 可以直接确定出 候选发送时刻, 当然, 它们也可以为函数关系, 即已知发送信息后, 通过计算, 能够获得候选发送时刻。 举例而言, 假设第一组同步信号包括第一同步信号, 第一组同 步信号的发送信息为第一同步信号的发送时刻,第一同步信号的发 送时刻与第二同步信号的候选发送时刻的对应关系为第二同步信 号的候选发送时刻为第一同步信号的发送时刻后的第 n个符号, n 为整数, 则已知第一同步信号的发送时刻后, 通过计算, 基站就可 确定出第二同步信号的候选发送时刻。
再例如,第一组同步信号的发送信息为第一同步信号的发送序 列,而第一同步信号的发送序列与第二同步信号的候选发送时刻的 对应关系为预先以列表方式设定的、第一同步信号的各发送序列分 别对应第二同步信号的候选发送时刻的不同集合,即已知第一同步 信号的发送序列, 基站通过查表的方式, 即可找到与第一同步信号 的发送序列对应的第二同步信号的候选发送时刻的集合,即确定出 第二同步信号的候选发送时刻。 与上述示例类似, 本发明实施例中可以设置多种对应关系, 这 里不再详述。
举例说明, 在本发明的一个实施例中, 第一组同步信号包括第 一同步信号,第一组同步信号的发送信息为第一同步信号的发送时 刻,第一同步信号的发送时刻与第二同步信号的候选发送时刻具有 ——对应关系, 该对应关系为: 第一同步信号的发送时刻为第二同 步信号的候选发送时刻。 假设第一同步信号的发送周期为 10ms , 第二同步信号的发送周期为 100ms , 如果 UE想要检测到第二同步 信号, UE可以第二同步信号的每个发送周期 100ms 中每一个毫秒 都去检测第二同步信号, 直到检测到第二同步信号为止。 而在本发 明实施例中, 每个第二同步信号的发送周期 100ms 中具有 10个第 一同步信号的发送时刻, 即具有 10个第二同步信号的候选发送时 刻, 基站将在这 10个时刻中的全部或者部分时刻中发送第二同步 信号, 而 UE 只需在这 10 个时刻对第二同步信号进行检测, 不需 要在 100ms 中的每个时刻都去检测第二同步信号, 降低了检测复 杂度。 此外, 如果网络中不同小区的第二同步信号的候选发送时刻 均为这 10个时刻, 那么不同的小区的第二同步信号可以分别用不 同的候选发送时刻来发送,比如小区 1用第一个候选发送时刻发送 第二同步信号, 小区 2用第 5个候选发送时刻发送第二同步信号, 这样对于处于不同小区的 UE , 都可以检测出各自小区的第二同步 信号, 且小区间的第二同步信号之间是时分错开, 因此实现了干扰 规避, 提高了检测性能。 其二:
基站根据第一组同步信号的发送信息、以及该发送信息与第二 同步信号的发送时刻的对应关系, 确定出第二同步信号的发送时 刻。
其中,第一组同步信号的发送信息与第二同步信号的发送时刻 的对应关系与上述第一种实现方式中所描述的第一组同步信号的 发送信息与第二同步信号的候选发送时刻的对应关系类似,此处不 再赘述。
可以通过预先设定这种对应关系,使得基站发送第二同步信号 的时刻与通信网络中其他小区中至少一个小区不同,从而有效降低 基站与其他小区之间在发送第二同步信号时所产生的干扰, 提高 UE对第二同步信号的接收性能。 在这种实现方式中, 无论对于基站而言, 还是对于 UE而言, 第一组同步信号的发送信息与第二同步信号的发送时刻的对应关 系是预先设定好的, 在已知第一组同步信号的发送信息的情况下, 基站和 UE均能根据预先设定好的对应关系, 确定出第二同步信号 的发送时刻, UE将在这些发送时刻检测第二同步信号以获取第二 同步信号, 由于基站可以选择与通信网络中其他小区中至少一个小 区不同的时刻发送第二同步信号,有效降低了基站与其他小区之间 在发送第二同步信号时所产生的干扰, 因此能够有效提高 UE检测 到第二同步信号的可能性, 进而有效提高 UE的检测性能。 其三:
基站首先确定出第二同步信号的候选发送时刻, 然后, 根据第 一组同步信号的发送信息,选择部分或全部候选发送时刻作为第二 同步信号的发送时刻。
此种方式中,候选发送时刻与前述第一种方式的候选发送时刻 的意义相同, 均指可以发送第二同步信号的所有时刻, 这里不再贅 述。
与前述第一种方式不同,此种方式中基站首先确定出第二同步 信号的候选发送时刻,再利用第一组同步信号的发送信息与第二同 步信号的对应关系, 在这些候选发送时刻中, 选择出第二同步信号 的发送时刻。 这些候选发送时刻可以是预先设定好的,也可以是基站自行确 定的并通知给 UE的, 例如根据当前信道状态等确定, 或者和网络 中其他小区进行干扰协调后所确定。 因此, 基站所确定的第二同步 信号的候选发送时刻可以与通信网络中其他小区的候选发送时刻 部分相同或者完全不同, 进而在选择第二同步信号的发送时刻时, 可以使得基站所选择的发送时刻与其他小区所选择的发送时刻仅 少量相同或者完全不同,有效降低了基站与其他小区之间在发送第 二同步信号时所产生的干扰, 因此能够有效提高 UE检测到第二同 步信号的可能性, 进而有效提高 UE的检测性能。
而且,即使基站所确定的第二同步信号的候选发送时刻与通信 网络中其他小区的候选发送时刻相同,在基站根据第一组同步信号 的发送信息, 选择第二同步信号的发送时刻时, 可以使得基站选择 的发送第二同步信号的时刻与通信网络中其他小区中至少一个小 区不同,从而有效降低基站与其他小区之间在发送第二同步信号时 所产生的干扰, 提高 UE对第二同步信号的接收性能。
这种实现方式中, 对于 UE 而言, UE可以根据预先设定或者 基站的通知确定出第二同步信号的候选发送时刻, UE并可根据第 一组同步信号的发送信息,在这些候选发送时刻中确定出第二同步 信号的发送时刻, 并在这些发送时刻检测第二同步信号, 由于基站 可以在候选发送时刻中选择与通信网络中其他小区中至少一个小 区不同的时刻发送第二同步信号,有效降低了基站与其他小区之间 在发送第二同步信号时所产生的干扰, 必然提高了 UE检测到第二 同步信号的可能性, 进而在进行小区识别时, 有效提高了 UE的检 测性能。
103 , 基站根据第二同步信号的发送时刻发送第二同步信号。 本发明实施例提供的同步信号的发送方法,基站能够通过第一 组同步信号的发送信息, 确定出第二同步信号的发送时刻, 基站在 这些发送时刻发送第二同步信号, 而 UE可以通过第一同步信号的 发送信息确定出第二同步信号的发送时刻或者候选发送时刻,并在 这些时刻检测第二同步信号, 因此, 基站可以通过选择第二同步信 号的发送时刻而实现与其他小区之间的干扰协调,可以避免基站与 多个其他小区同时发送第二同步信号,从而有效降低基站和其他小 区在发送第二同步信号时所产生的干扰, 而 UE在其确定的发送时 刻或者候选发送时刻检测第二同步信号, 因此, 能够有效提高 UE 检测到第二同步信号的可能性, 进而有效提高 UE的检测性能。 需要说明的是, 本发明实施例中, 当第一组同步信号仅包括一 个同步信号时,该同步信号可以与第二同步信号通过相同或者不同 的服务小区 (也称为载波)发送。 当第一组同步信号包括多个同步 信号时, 该多个同步信号可以通过相同或者不同的服务小区发送。 当第一组同步信号包括多个同步信号,且该多个同步信号通过相同 的服务小区发送时,第二同步信号可以和第一组同步信号通过相同 的服务小区发送也可以通过不同的服务小区发送。 在本发明的一个实施例中, 还包括:
所述第一组同步信号只包括第一同步信号, 例如主同步信号; 第二同步信号例如为辅同步信号。 在本实施例中, 为方便描述, 上 述第一同步信号和第二同步信号的组合称为第二组同步信号。
所述第二组同步信号在无线帧的第一半帧和第二半帧的位置 是不同的。 例如, 所述第一半帧是一个无线帧的子帧 0到 4 , 所述 第二半帧是一个无线帧的子帧 5 到 9。 这样, UE可以根据第二组 同步信号在两个半帧的不同位置, 来确定载波类型和 /或帧定时信 息。 该载波类型包括后向兼容载波和新载波, 因为后向兼容载波上 PS S和 S S S在两个半帧的位置是相同的, 而在新载波上是不同的。 所述新载波一般是非后向兼容的, 即低版本的 UE不可以通过所述 新载波接入, 也不可以在所述新载波上驻留; 所述新载波的特征还 可以包括如下中的至少一种: 新载波上靠 ePDCCH 的公共搜索空 间接收公共控制信息, 比如调度系统消息、 寻呼消息, 随机接入应 答消息的 ePDCCH , 该 ePDCCH以信道信息预编码传输, 且资源分 配以物理资源块或物理资源块对为单位;新载波上的小区特定参考 信号不是每个子帧都发送, 比如 5个子帧发送一次; 新载波上只支 持基于 UE特定参考信号的传输模块; 等等。 具体地:
例如,第二组同步信号中的主同步信号和辅同步信号的相对位 置关系在第一半帧和第二半帧是相同的,比如主同步信号和辅同步 信号的符号相邻且主同步信号时间上在后, 其他也不排除。 但是, 第二组同步信号在两个半帧的绝对时域位置不同,比如符号位置不 同和 /或子帧位置不同。 符合上述条件的一个例子是: PS S 和 S S S 分别位于第一半帧的子帧 0 的第 2 个符号和第 3 个符号, P S S 和 S S S分别位于第二半帧的子帧 5的第 3个符号和第 4个符号, 其他 类似位置也不排除。 这样, UE检测到两个半帧的 PS S和 S S S后, 通过比较这两个半帧的第二组同步信号的不同时间间隔,就可以确 定帧定时, 比如如果 UE检测发现前一个半帧的第二组同步信号距 离后一个半帧的第二组同步信号的时间间隔为 5 个子帧还多一个 符号, 则 UE确定上述前一个半帧是一个无线帧的第一半帧, 上述 后一个半帧是一个无线帧的第二半帧; 反之, 如果 UE检测发现前 一个半帧的第二组同步信号距离后一个半帧的第二组同步信号的 时间间隔为 5个子帧但少一个符号, 则 UE确定上述前一个半帧是 一个无线帧的第二半帧, 上述后一个半帧是一个无线帧的第一半 帧。 进一步地, UE还可以通过上述类似的方法, 即通过两个半帧 的第二组同步信号的位置关系确定载波类型。
又例如,第二组同步信号中的主同步信号和辅同步信号的相对 位置关系在第一半帧和第二半帧是不同的, 比如 PS S 和 S S S 分别 位于第一半帧的子帧 0 的第 2 个符号和第 3 个符号, PS S 和 S S S 分别位于第二半帧的子帧 5的第 2个符号和第 4个符号。其他相比 符号位置也不排除, 或者也可以是子帧位置不同, 比如第二组同步 信号在两个半帧中 占用不同的子帧。 具体确定帧定时和 /或载波类 型的方法同上述实施例, 在此不再贅述。
基于上述第二组同步信号在两个半帧的不同位置, UE可以获 得帧同步信号, 和 /或, 载波类型信息, 且可以保证 UE 检测一组 P S S和 S S S的方法与现有机制, 即后弦兼容载波上的机制一样, 因 为 P S S 和 S S S 的相对位置可以保持不变, 这样可以大大减少小区 搜索的复杂度。
与前述的发送方法实施例相对应,本发明实施例又提供了一种 同步信号的接收方法, 如图 2所示, 包括:
200 , U E检测第一组同步信号以获取第一组同步信号。 本发明实施例中, 第一组同步信号中包括至少一个同步信号。
201 , UE根据第一组同步信号的发送信息, 确定第二同步信号 的检测时刻。
其中,第一组同步信号的发送信息是基站发送第一组同步信号 的过程中所采用的发送参数或者通过第一组同步信号的发送所指 示的信息, 具体可参见前述的发送方法实施例, 这里不再贅述。 本发明实施例中, 第二同步信号对于 UE而言是用于进行小区 识别的, 如果 UE能够正常的检测到第二同步信号, 就能够识别小 区并接入小区。 需要说明的是, 本发明的所有实施例中, "发送时刻"对应基站 侧进行描述, "检测时刻 "对应 UE侧进行描述, 对于 UE 而言, 第 二同步信号在检测时刻中的全部或部分时刻发送, 即"第二同步信 号的检测时刻,,中必然包括"第二同步信号的发送时刻 "。
具体的,与前述发送方法实施例中步骤 102的 3种实现方式相 对应, 本步骤中可有如下二种实现方式: 其一:
与前述发送方法实施例中步骤 102的前两种实现方式相对应, 本步骤中, UE可以根据第一组同步信号的发送信息, 以及该发送 信息与第二同步信号的检测时刻的对应关系,确定第二同步信号的 检测时刻。 这种方式中, 对于 UE而言, 第一组同步信号的发送信息与第 二同步信号的检测时刻的对应关系是预先设定的, UE 已知第一组 同步信号的发送信息与第二同步信号的检测时刻的对应关系。
如果基站采用前述发送方法实施例中步骤 102 中所述的第一 种实现方式, 本实现方式中, UE所采用的第一组同步信号的发送 信息与第二同步信号的检测时刻的对应关系,可以与基站所采用的 第一组同步信号的发送信息与第二同步信号的候选发送时刻的对 应关系相同。 也就是说, UE 所确定的检测时刻, 即为基站所确定 的候选发送时刻, 两者的意义等同。 由于基站将第二同步信号发送 在候选发送时刻中的部分或全部时刻, UE 只需在确定的检测时刻 进行第二同步信号的检测, 一方面降低了检测的复杂度, 另一方面 基站可以在候选发送时刻中选择第二同步信号的发送时刻,有效降 低基站与其他小区之间在发送第二同步信号时所产生的干扰,提高 了 UE检测到第二同步信号的可能性, 进而在进行小区识别时, 有 效提高了 UE的检测性能。
如果基站采用前述发送方法实施例中步骤 102 中所述的第二 种实现方式, UE所采用的第一组同步信号的发送信息与第二同步 信号的检测时刻的对应关系,可以与基站所采用的第一组同步信号 的发送信息与第二同步信号的发送时刻的对应关系相同。 也就是 说, UE 所确定的检测时刻, 即为基站所确定的发送时刻。 两者的 意义等同。 由于通过预先设定的这种对应关系, 可以使得基站发送 第二同步信号的时刻与通信网络中其他小区中至少一个小区不同, 从而有效降低基站与其他小区之间在发送第二同步信号时所产生 的干扰, 提高 UE对第二同步信号的接收性能。 其二:
与前述发送方法实施例中步骤 102的第三种实现方式相对应, 本步骤中, UE 可以首先确定第二同步信号的候选检测时刻, 然后 根据第一组同步信号的发送信息,选择部分或全部候选检测时刻作 为第二同步信号的检测时刻。 具体的, UE可根据, 选择与所述发送信息对应的部分候选检 测时刻作为所述第二同步信号的检测时刻。 其中,用户所确定的候选检测时刻即为基站所确定的候选发送 时刻, 而 UE所采用的第一组同步信号的发送信息与第二同步信号 的候选检测时刻的对应关系,可以与基站所采用的第一组同步信号 的发送信息与第二同步信号的发送时刻的对应关系相同。
这种实现方式, 一方面, 基站所确定的第二同步信号的候选发 送时刻可以与通信网络中其他小区的候选发送时刻部分相同或者 完全不同, 进而在选择第二同步信号的发送时刻时, 可以使得基站 所选择的发送时刻与其他小区所选择的发送时刻仅少量相同或者 完全不同,有效降低了基站与其他小区之间在发送第二同步信号时 所产生的干扰, 因此能够有效提高 UE检测到第二同步信号的可能 性, 进而有效提高 UE的检测性能。 另一方面, 即使基站所确定的 第二同步信号的候选发送时刻与通信网络中其他小区的候选发送 时刻相同, 在基站根据第一组同步信号的发送信息, 选择第二同步 信号的发送时刻时,可以使得基站选择的发送第二同步信号的时刻 与通信网络中其他小区中至少一个小区不同,从而有效降低基站与 其他小区之间在发送第二同步信号时所产生的干扰, 提高 UE对第 二同步信号的接收性能。
上述两种方式中的对应关系是预先设定好的,可以是直接对应 关系, 也可以是函数关系, 具体请参见前文基站侧实施例, 这里不 再赘述。
202 , UE在其确定的检测时刻, 检测第二同步信号以获取第二 同步信号。
需要说明的是, 本发明实施例中, 特别的, UE获取到的第二 同步信号的发送周期可大于第一组同步信号中至少一个同步信号 的发送周期。 本发明实施例提供的同步信号的接收方法, UE可以通过第一 同步信号的发送信息确定出第二同步信号的检测时刻,并在第二同 步信号的检测时刻检测第二同步信号, 因此, 基站可以通过选择第 二同步信号的发送时刻而实现与其他小区之间的干扰协调,可以避 免基站与多个其他小区同时发送第二同步信号,从而有效降低基站 和其他小区在发送第二同步信号时所产生的干扰, 而 UE能够确定 出第二同步信号的检测时刻, 并在这些检测时刻检测第二同步信 号, 因此能够有效提高 UE检测到第二同步信号的可能性, 进而有 效提高 UE的检测性能。
需要说明的是, 本发明实施例中, 在步骤 201 中, UE需要根 据第一组同步信号的发送信息, 确定第二同步信号的检测时刻。 第 一组同步信号的发送信息是基站发送第一组同步信号的过程中所 采用的发送参数或者通过第一组同步信号的发送所指示的信息。本 发明实施例对 UE如何获得第一组同步信号的发送信息不作限定, 可以有多种方式。 举例说明, 在本发明的一个实施例中, 第一组同步信号包括第 一同步信号,第一组同步信号的发送信息为第一同步信号的发送序 列、 发送周期、 发送时刻中的至少一种。 对于第一同步信号的发送 序列, UE可以根据其在步骤 200 中获取的第一同步信号, 获取第 一同步信号的发送序列,即通过检测第一同步信号而检测出第一同 步信号的发送序列, 同样, 对于第一同步信号的发送时刻, UE也 可以根据其在步骤 200 中获取的第一同步信号,获取第一同步信号 的发送时刻,即通过检测第一同步信号而获取到第一同步信号的发 送时刻, 例如, UE在某个无线帧中某个子帧检测到第一同步信号, 即第一同步信号的发送时刻为该无线帧的该子帧。 对于第一同步信号的发送周期, 可选的, 其可以是预先设置好 的, UE 能够根据预先设置, 获取第一同步信号的发送周期, 其也 可以是 UE根据其在步骤 200中获取的第一同步信号, 获取第一同 步信号的发送周期, 即 UE通过检测不同发送时刻的第一同步信号 而获取第一同步信号的发送周期。 例如, UE可以通过多次检测第 一同步信号来确定出该周期, 假设第一同步信号的发送周期为 5ms , 则 UE可以通过检测不同发送时刻的第一同步信号, 每 5ms 会出现一个相关峰值, 因此, UE 可以确定出第一同步信号的发送 周期为 5ms。
在本发明的一个实施例中,第一组同步信号包括至少两个同步 信号, 这种情况下, 第一组同步信号的发送信息可以是第一组同步 信号中至少一个同步信号指示的子帧和 /或无线帧定时信息, 其中, 子帧定时信息是指子帧的起始和结束点,无线帧定时信息是指无线 帧的起始和结束点。 例如, 假设第一组同步信号包括 S SS , SS S在 一个无线帧中的子帧 0和子帧 5各发送一次,且这两次发送的序列 的交织方式不同, 因此 UE可以从这两次 S SS发送的交织方式来区 分哪一个是子帧 0 , 哪一个是子帧 5 , 子帧 0的第一个符号就可以 看做是无线帧的帧头, 即起始点。
在本发明的一个实施例中, 在步骤 202之后, 同步信号的接收 方法还可包括:
UE根据获取的第二同步信号进行小区或小区组识别。 进一步的, 在本发明的一个实施例中, 第一组同步信号包括第 一同步信号, UE在步骤 201 中确定出第二同步信号的检测时刻, 进而就可确定出第二同步信号的检测时刻的周期,在第一同步信号 的发送周期大于第二同步信号的检测时刻的周期的情形下, 即相邻 的两个第一同步信号的发送时刻之间包括至少两个第二同步信号 的检测时刻,该至少两个检测时刻包括第一检测时刻和第二检测时 刻; 这种情况下, 在步骤 202 中, UE在检测第二同步信号时, 由 于检测时刻具有时间上的区分, 因此, UE 可以不必在每个检测时 候都检测第二同步信号的所有序列。 具体的, UE可以在第一检测 时刻, 检测第二同步信号的第一序列集合, 而在第二检测时刻, 检 测第二同步信号的第二序列集合, 其中, 第一序列集合中序列的个 数和 /或第二序列集合中序列的个数小于第二同步信号需要指示的 小区标识的总个数或小区组标识的总个数, 从而能够有效简化 UE 的检测复杂度。 而可选的, 第一序列集合中的序列和第二序列集合 中的序列可以相同, 也可以不同, 如果第一序列集合中的序列和第 二序列集合中的序列相同时,可以便利 UE对第二同步信号的检测, 简化 UE的检查复杂度。 在本发明的一个实施例中, 还包括:
所述第一组同步信号只包括第一同步信号, 例如主同步信号; 第二同步信号例如为辅同步信号。 在本实施例中, 为方便描述, 上 述第一同步信号和第二同步信号的组合称为第二组同步信号。
所述第二组同步信号在无线帧的第一半帧和第二半帧的位置 是不同的。 例如, 所述第一半帧是一个无线帧的子帧 0到 4 , 所述 第二半帧是一个无线帧的子帧 5 到 9。 这样, UE可以根据第二组 同步信号在两个半帧的不同位置, 来确定载波类型和 /或帧定时信 息。 该载波类型包括后向兼容载波和新载波, 因为后向兼容载波上 PS S和 S SS在两个半帧的位置是相同的, 而在新载波上是不同的。 所述新载波一般是非后向兼容的, 即低版本的 UE不可以通过所述 新载波接入, 也不可以在所述新载波上驻留; 所述新载波的特征还 可以包括如下中的至少一种: 新载波上靠 ePDCCH 的公共搜索空 间接收公共控制信息, 比如调度系统消息、 寻呼消息, 随机接入应 答消息的 ePDCCH , 该 ePDCCH以信道信息预编码传输, 且资源分 配以物理资源块或物理资源块对为单位;新载波上的小区特定参考 信号不是每个子帧都发送, 比如 5个子帧发送一次; 新载波上只支 持基于 UE特定参考信号的传输模块; 等等。 具体地:
例如,第二组同步信号中的主同步信号和辅同步信号的相对位 置关系在第一半帧和第二半帧是相同的,比如主同步信号和辅同步 信号的符号相邻且主同步信号时间上在后, 其他也不排除。 但是, 第二组同步信号在两个半帧的绝对时域位置不同,比如符号位置不 同和 /或子帧位置不同。 符合上述条件的一个例子是: PSS 和 SSS 分别位于第一半帧的子帧 0 的第 2 个符号和第 3 个符号, PSS 和 SSS分别位于第二半帧的子帧 5的第 3个符号和第 4个符号, 其他 类似位置也不排除。 这样, UE检测到两个半帧的 PSS和 SSS后, 通过比较这两个半帧的第二组同步信号的不同时间间隔,就可以确 定帧定时, 比如如果 UE检测发现前一个半帧的第二组同步信号距 离后一个半帧的第二组同步信号的时间间隔为 5 个子帧还多一个 符号, 则 UE确定上述前一个半帧是一个无线帧的第一半帧, 上述 后一个半帧是一个无线帧的第二半帧; 反之, 如果 UE检测发现前 一个半帧的第二组同步信号距离后一个半帧的第二组同步信号的 时间间隔为 5个子帧但少一个符号, 则 UE确定上述前一个半帧是 一个无线帧的第二半帧, 上述后一个半帧是一个无线帧的第一半 帧。 进一步地, UE还可以通过上述类似的方法, 即通过两个半帧 的第二组同步信号的位置关系确定载波类型。
又例如,第二组同步信号中的主同步信号和辅同步信号的相对 位置关系在第一半帧和第二半帧是不同的, 比如 PSS 和 SSS 分别 位于第一半帧的子帧 0 的第 2 个符号和第 3 个符号, PSS 和 SSS 分别位于第二半帧的子帧 5的第 2个符号和第 4个符号。其他相比 符号位置也不排除, 或者也可以是子帧位置不同, 比如第二组同步 信号在两个半帧中 占用不同的子帧。 具体确定帧定时和 /或载波类 型的方法同上述实施例, 在此不再贅述。
基于上述第二组同步信号在两个半帧的不同位置, UE可以获 得帧同步信号, 和 /或, 载波类型信息, 且可以保证 UE 检测一组 PSS和 SSS的方法与现有机制, 即后弦兼容载波上的机制一样, 因 为 PSS 和 SSS 的相对位置可以保持不变, 这样可以大大减少小区 搜索的复杂度。 以下通过具体的实施例对本发明实施例提供的同步信号的发 送、 接收方法进行进一步的详细说明。 本实施例中, 第一组同步信号包括第一同步信号, 第一同步信 号和第二同步信号通过相同的服务小区发送,本实施例中以第一同 步信号为主同步信号 PSS,而第二同步信号为辅同步信号 SSS为例 进行说明, 可以理解的是, 本发明不限如此, 第一同步信号和第二 同步信号还可以是其他的同步信号, 本实施例具体如下:
如图 3所示, 在基站侧, 基站所执行的发送方法包括:
300, 确定主同步信号 PSS的发送信息, 根据确定的发送信息, 发送主同步信号 PSS。 其中, PSS的发送信息包括 PSS的发送序列、 发送周期、 发送 时刻等。
本步骤中, 基站发送 PSS 所采用的序列的个数不限, 可以较 少, 例如仅采用 3 个 Zadoff-Chu 序列, 甚至可以仅采用一个 Zadoff-Chu序歹 'J。 对于 UE来讲, 在其检测 PSS时, 由于 PSS的序 列较少, 则 UE所花费的检测时间降低, 降低了 UE检测 P S S的难 度, UE检测性能得到了有效提升。 可以理解的是, 基站所在的通信网络中, 除该基站以外, 还包 括若干其他基站, 即若干小区。 可选的, 本步骤中, 基站可以使用 与系统中至少一个其他小区相同的序列,并与该至少一个其他小区 同时向所述用户设备发送 PSS。基站采用与其他小区相同的序列并 与该其他小区同时发送 PSS, 因此能够为 UE提供合并增益, 进一 步提高 UE的检测性能。 例如, 系统内各小区均采用相同的序列, 即全网采用同一个序列, 并且各小区同时发送 PSS。 可选的, 本步骤中, 基站发送 PSS 的周期, 即 PSS 的发送周 期例如可以采用 5ms或 10ms。
301, 根据 PSS的发送信息, 以及预先设定的 PSS的发送信息 与 SSS的候选发送时刻的对应关系, 确定 SSS的候选发送时刻。 本步骤中所采用的 PSS 的发送信息可以是 PSS 的发送序列、 发送周期、 发送时刻中的至少一种。 预先设定的 PSS 的发送信息 与 SSS 的候选发送时刻的对应关系可以是直接对应关系, 即每种 PSS的发送信息对应着一种 SSS的候选发送时刻,也可以是函数对 应关系, SSS的候选发送时刻为 PSS的发送信息的函数, 根据 PSS 的发送信息, 能够计算出 SSS的候选发送时刻。
举例说明, 如图 4所示, 4叚设 PSS的发送周期为 10ms, 发送 时刻分别为子帧 0、 10、 20..., 而 SSS的候选发送时刻的周期是预 先定义的, 为 5ms, 每个 SSS的候选发送时刻为一个子帧上的连续 3个符号, SSS的候选发送时刻与 PSS的发送时刻的对应关系是 SSS 的候选发送时刻的起始时刻与 PSS 的发送时刻的起始时刻相同, 因此, 本步骤中, 基站就可根据上述的对应关系以及预先设定的 SSS的候选发送时刻的周期,就可确定出 SSS的候选发送时刻为子 帧 0上连续 3个符号、 子帧 5上连续 3个符号…。
302, 在确定的 SSS的候选发送时刻中选择 SSS的发送时刻, 所述 SSS的发送时刻为 SSS的候选发送时刻中的全部或部分时刻。
具体的, 基站可以通过与其他小区的干扰协调, 选择 SSS 的 发送时刻,使得基站使用与通信网络中其他小区的第二同步信号不 同的候选发送时刻来发送第二同步信号,从而实现基站与不同小区 之间的干扰协调。
同样以图 4为例,假设通信网络中各小区的候选发送时刻均相 同,那么不同的小区的第二同步信号可以分别用不同的候选发送时 刻来发送, 基站可以通过与小区之间的干扰协调, 选择候选发送时 刻中的时刻发送第二同步信号, 比如小区 1用第一个候选发送时刻 发送第二同步信号,小区 2用第 5个候选发送时刻发送第二同步信 号, 这样对于处于不同小区的 UE, 都可以检测出各自小区的第二 同步信号, 且小区间的第二同步信号之间是时分错开, 因此实现了 干扰规避, 提高了检测性能。
303, 在选择的发送时刻, 发送 SSS。
本领域技术人员可以理解的是, 无论是 SSS, 还是 PSS, 两者 均为周期性发送信号, 而并不是仅仅发送一次。
需要说明的是, 虽然本实施例是顺序进行描述的, 但本发明不 限于此, 本领域技术人员可以对上述各步骤的顺序进行调整。 如图 5 所示, 本实施例中, 在 UE侧, UE所执行的接收方法 包括:
401, 检测 PSS以获取 PSS。
402, 根据 PSS的发送信息, 以及预先设定的 PSS的发送信息 与 SSS的候选检测时刻的对应关系, 确定 SSS的候选检测时刻。 需要说明的是, 本实施例中, "候选发送时刻"对应基站侧进行 描述, "候选检测时刻"对应 UE侧进行描述, 但两者的本质是相同 的,即 UE所确定的候选检测时刻即为基站所确定的候选发送时刻, PSS 的发送信息与 SSS 的候选检测时刻的对应关系与 PSS 的发送 信息与 SSS的候选发送时刻的对应关系相同。 本步骤中, UE所采用的 PSS的发送信息可以是 PSS的发送序 列、 发送周期、 发送时刻中的至少一种。 预先设定的 PSS 的发送 信息与 SSS 的候选检测时刻的对应关系可以是直接对应关系, 即 每种 PSS 的发送信息对应着一种 SSS 的候选检测时刻, 也可以是 函数对应关系, SSS的候选检测时刻为 PSS的发送信息的函数, 根 据 PSS的发送信息, 能够计算出 SSS的候选检测时刻。
本步骤中, 如果 PSS的发送信息为 PSS的发送周期, UE可以 通过预先设定得到, 也可以通过步骤 401 中对 PSS 的检测过程而 检测得到。如果 PSS的发送信息为 PSS的发送序列和 /或发送时刻, UE可以通过步骤 401 中对 PSS的检测过程而检测得到。 同样以图 4为例, ^^设 PSS的发送周期为 10ms, 发送时刻分 别为子帧 0、 10、 20..., 而 SSS的候选发送时刻的周期是预先定义 的, 为 5ms, 每个 SSS的候选发送时刻为一个子帧上的连续 3个符 号, SSS 的候选检测时刻与 PSS 的发送时刻的对应关系是 SSS 的 候选检测时刻的起始时刻与 PSS 的发送时刻的起始时刻相同, 因 此, 本步骤中, UE检测到 PSS的发送时刻为子帧 0, 10..., UE根 据上述的对应关系以及预先设定的 SSS 的候选检测时刻的周期, 就可确定出 SSS的候选检测时刻为子帧 0上连续 3个符号、 子帧 5 上连续 3个符号…。
403 , 在确定的候选检测时刻, 检测 SSS以获取 SSS。 可选的, 在 PSS 的发送周期大于 SSS 的候选检测时刻的周期 时, 相邻的两个 PSS 的发送时刻之间将具有至少两个候选检测时 刻, 这种情况下, 本步骤中, UE在检测 SSS时, 由于候选检测时 刻具有时间上的区分, 因此, UE 可以不必在该至少两个候选检测 时刻的每个时刻都检测 SSS 的所有序列。 例如, 在该至少两个候 选检测时刻中, 所检测的序列的个数都小于 SSS 需要指示的小区 标识或小区组标识的个数。
404, 根据所检测的 SSS, 进行小区识别。
对于小区识别, 即识别物理小区标识。 具体的, 当全网用统一 的一个 PSS序歹l时, 本步骤中, UE可以根据检测的 SSS的序列确 定物理小区标识, 而当全网 PSS有多个序列时, UE可联合 PSS和 SSS的序列来确定物理小区标识。
进一步的, 作为本实施例的一种改进, 本实施例的接收方法还 可包括:
UE根据 PSS, 进行符号同步, 子帧同步和无线帧同步。 根据 PSS 可以获得符号同步和子帧同步, 因为一个符号和一 个子帧的长度是固定的, 而 PSS 在一个子帧中的符号位置也是固 定的。 而由于无线帧的长度为 10ms, 还可以把 PSS 的周期设为 10ms, 则 UE通过检测 PSS还可以确定无线帧的同步。 需要说明的是, 虽然本实施例是顺序进行描述的, 但本发明不 限于此, 本领域技术人员可以对上述各步骤的顺序进行调整。
以下通过另一实施例对本发明实施例提供的同步信号的发送、 接收方法进行进一步的详细说明。
本实施例中, 第一组同步信号包括至少两个同步信号, 本实施 例中以第一组同步信号包括 PSS 和 SSS 两个同步信号为例进行说 明, 第一组同步信号中的 PSS 和 SSS通过相同的服务小区发送, 而第二同步信号与第一组同步信号的 PSS 和 SSS通过不同的服务 小区发送, 第二同步信号可以是 PSS, 也可以是 PSS, 还可以是其 他同步信号, 比如发现信号, 该发现信号不仅用于识别小区, 还可 以用作至少 idle态的无线资源管理测量,比如参考信号接收功率测 量和 /或参考信号接收质量测量等, 本实施例对此不做限定。 本实 施例具体: ¾口下: 如图 6所示, 在基站侧, 基站所执行的发送方法包括:
500, 通过相同服务小区分别发送第一组同步信号的主同步信 号 PSS和辅同步信号 sss。
501, 确定 SSS 和 PSS 指示的子帧和 /或无线帧定时信息, 并 根据该子帧和 /或无线帧定时信息, 确定出第二同步信号的候选发 送时刻。
具体的, PSS 和 SSS 可以用来指示子帧定时和无线帧定时信 息。 对于子帧定时, 就是确定子帧的起始点和结束点, 具体可以通 过 UE检测 PSS, 或检测 PSS和 SSS来获取, 因为 PSS和 SSS在 子帧中的位置是预定义的; 对于无线帧定时, 就是确定无线帧的起 始点和结束点, 具体可以通过检测 SSS来获取, 例如, SSS在一个 无线帧中的子帧 0和子帧 5各发送一次,且这两次发送的序列的交 织方式不同, 因此 UE可以从这两次 SSS发送的交织方式来区分哪 一个是子帧 0, 哪一个是子帧 5, 子帧 0的第一个符号就可以看做 是无线帧的帧头, 即起始点。 确定了子帧和 /或无线帧定时信息后, 以无线帧定时为例, 还 可以通过该无线帧定时, 无线帧号, 以及无线帧定时、 无线帧号与 第二同步信号的候选发送时刻的对应关系,确定第二同步信号的候 选发送时刻。 具体的, 获取到了无线帧定时信息, 再利用无线帧号, 比如要把第二同步信号发送在第 50、 150、 250...号无线帧附近的 某些候选发送时刻上, 那么就可以根据无线帧定时信息和无线帧 号, 确定第 50、 150、 250...号无线帧的位置, 进而就可以确定第 二同步信号的候选发送时刻的位置。 502, 在所确定的第二同步信号的候选发送时刻中, 选择第二 同步信号的发送时刻,第二同步信号的发送时刻为第二同步信号的 候选发送时刻中的全部或部分时刻。
上述步骤中确定了第二同步信号的候选发送时刻, 比如在 50、 150、 250...号无线帧附近的某些候选发送时刻, 在这些候选时刻上 可以选择第二同步信号的发送时刻,具体可以考虑将其他小区的第 二同步信号的发送时刻避开。
503, 在所选择的发送时刻, 通过与第一组同步信号的 PSS和 SSS不同的服务小区, 发送第二同步信号。
需要说明的是, 虽然本实施例是顺序进行描述的, 但本发明不 限于此, 本领域技术人员可以对上述各步骤的顺序进行调整。 如图 7所示, 本实施例中, 在 UE侧, UE所执行的接收方法 包括:
600, 分别检测第一组同步信号的 PSS 和 SSS 以获取 PSS 和 SSS, 并通过该检测获取 PSS 和 SSS 所指示的子帧和 /或无线帧定 时信息。
具体的, 获取子帧和 /或无线帧定时信息的步骤请参见图 6 所 示的实施例。
601, 从广播信道中获取无线帧号。
具体的, UE可以从物理广播信道中获取无线帧号信息。 或者, UE也可以通过其他广播信道获取该信息, 比如系统信息块等。
602, 根据获取的无线帧号、 PSS和 SSS所指示的子帧和 /或无 线帧定时信息、 以及获取的无线帧号、 PSS和 SSS所指示的子帧和
/或无线帧定时信息与第二同步信号的候选检测时刻的对应关系, 确定第二同步信号的候选检测时刻。 具体的, 获取到无线帧号, 无线帧定时信息之后, 还需要确定 上述两者与第二同步信号的候选检测时刻的对应关系,该对应关系 可以是预先定义的, 也可以是基站通过信令配置给 UE的。 例如, 该对应关系可以为候选检测时刻在第 50、 150、 250...号无线帧附 近, 发送周期为 100ms。 因为 UE通过无线帧定时可以确定无线帧 起始点和结束点, 通过无线帧号可以获取无线帧的排序, 因此 UE 可以确定 4美选检测时刻的位置。
603 , 在确定的候选检测时刻, 检测 SSS以获取 SSS。
获取到候选检测时刻后, 就可以在上述候选检测时刻上检测 sss。
604, 根据所检测的 SSS, 进行小区或小区组识别。
SSS 中可以携带小区标识或小区组标识, 因此 UE检测到 SSS 就可以获取其中携带的小区标识或小区组标识。
本实施例中, PSS和 SSS可以位于第一服务小区, 而第二同步 信号可以位于第二服务小区,假设第一和第二服务小区是异频的小 区, 那么 UE可以通过读取 PSS和 SSS, 和其他广播信道, 先接入 到第一服务小区, 然后在第一服务小区的辅助下, 比如第一服务小 区通知该 UE第二服务小区上的第二同步信号的位置, 具体通过无 线帧号, 无线帧定时和第二同步信号候选检测时刻的对应关系, 这 里假设第一和第二服务小区是同步的服务小区, 以便 UE可以确定 第二服务小区上第二同步信号的位置, 而不用 UE 自 己到第二服务 小区上每个时刻都去检测第二同步信号, 降低了 UE检测复杂度。
与前述同步信号的发送方法的实施例相对应,本发明实施例又 提供了一种基站 1, 如图 8所示, 包括:
信息确定单元 10, 用于确定第一组同步信号的发送信息, 第 一组同步信号包括至少一个同步信号; 时刻确定单元 11, 用于根据信息确定单元 10确定的发送信息 确定第二同步信号的发送时刻;
发送单元 12, 用于根据时刻确定单元 11确定的第二同步信号 的发送时刻发送第二同步信号。 本发明实施例提供的基站 1, 时刻确定单元 11 能够通过第一 组同步信号的发送信息, 确定出第二同步信号的发送时刻, 发送单 元 12在这些发送时刻发送第二同步信号, 因此, 基站 1 可以通过 选择第二同步信号的发送时刻而实现与其他小区之间的干扰协调, 可以避免基站与多个其他小区同时发送第二同步信号,从而有效降 低基站和其他小区在发送第二同步信号时所产生的干扰, 因此, 能 够有效提高 UE检测到第二同步信号的可能性, 进而有效提高 UE 的检测性能。 可选的, 在本发明的一个实施例中, 第二同步信号的发送周期 可大于第一组同步信号中至少一个同步信号的发送周期。 特别的, 在本发明的一个实施例中, 第二同步信号的发送时刻 与其他小区中的至少一个小区发送的第二同步信号的发送时刻不 同。
本发明实施例中, 可选的, 时刻确定单元 1 1 可采用如下三种 方式确定第二同步信号的候选发送时刻, 具体如下:
其一,时刻确定单元 1 1可根据信息确定单元 10确定的发送信 息确定第二同步信号的候选发送时刻; 在其确定的候选发送时刻 中, 选择部分或全部候选发送时刻作为第二同步信号的发送时刻。 例如, 时刻确定单元 1 1 可具体根据所述信息确定单元确定的发送 信息,以及所述发送信息与所述第二同步信号的候选发送时刻的对 应关系, 确定所述第二同步信号的候选发送时刻。
其二, 时刻确定单元 1 1 可根据所述信息确定单元确定的发送 信息、 以及所述发送信息与第二同步信号的发送时刻的对应关系, 确定所述第二同步信号的发送时刻。
其三, 时刻确定单元 1 1 可首先确定所述第二同步信号的候选 发送时刻, 然后根据所述信息确定单元确定的发送信息, 选择部分 或全部候选发送时刻作为所述第二同步信号的发送时刻。
可选的, 在本发明的一个实施例中, 第一组同步信号包括第一 同步信号, 信息确定单元 10确定的第一组同步信号的发送信息包 括第一同步信号的发送序列、 发送周期、 发送时刻中的至少一种。 举例而言, 第一同步信号可以为为主同步信号, 第二同步信号可以 为辅同步信号, 当然它们还可以为其它同步信号, 本发明对此不做 限定。 可选的, 在本发明的另一个实施例中, 第一组同步信号包括至 少两个同步信号, 信息确定单元 10确定的第一组同步信号的发送 信息包括所述第一组同步信号中至少一个同步信号指示的子帧和 / 或无线帧定时信息。 举例而言, 第一组同步信号包括的至少两个同 步信号包括主同步信号和辅同步信号, 信息确定单元 10确定的第 一组同步信号的发送信息包括主同步信号和辅同步信号指示的子 帧和 /或无线帧定时信息。 需要说明的是, 本发明实施例中, 第一组同步信号可通过相同 的小区发送,第一组同步信号和第二同步信号可通过相同的或不同 的小区发送。
可以理解的是,上述各功能单元的具体工作方式可参见前文方 法实施例。
同样与前述同步信号的发送方法的实施例相对应,本发明实施 例又提供了一种基站 2 , 如图 9所示, 包括: 包括处理器 20 , 通信接口 21 , 存储器 22和总线 23 ;
处理器 20、 通信接口 21、 存储器 22通过总线 23完成相互间 的通信;
通信接口 21 , 用于与基站 2的外部设备通信;
存储器 22 , 用于存放程序 221 ;
处理器 20 , 用于执行存储器 22存放的程序 221 ; 其中, 程序 221 包括: 信息确定单元, 用于确定第一组同步信号的发送信息, 所述第 一组同步信号包括至少一个同步信号; 时刻确定单元,用于根据所述信息确定单元确定的发送信息确 定第二同步信号的发送时刻; 发送单元,用于根据所述时刻确定单元确定的第二同步信号的 发送时刻发送所述第二同步信号。 可理解的是,图 8所示的实施例中各功能单元包含于所述程序 中,各功能单元的具体工作方式请参见图 8所述的实施例和前述同 步信号的发送方法的实施例, 此处不再贅述。
本发明实施例提供的基站 2 , 能够通过第一组同步信号的发送 信息, 确定出第二同步信号的发送时刻, 在这些发送时刻发送第二 同步信号, 因此, 基站 2可以通过选择第二同步信号的发送时刻而 实现与其他小区之间的干扰协调,可以避免基站与多个其他小区同 时发送第二同步信号,从而有效降低基站和其他小区在发送第二同 步信号时所产生的干扰, 因此, 能够有效提高 UE检测到第二同步 信号的可能性, 进而有效提高 UE的检测性能。
同样与前述同步信号的发送方法的实施例相对应,本发明实施 例又提供了一种基站 3 ,如图 10所示,包括处理器 30和存储器 3 1 , 图 8所示的实施例中各功能单元包含于所述包含于处理器 30 中, 各功能单元的具体工作方式请参见图 8 所述的实施例和前述同步 信号的发送方法的实施例, 此处不再贅述。
本发明实施例提供的基站 3 , 能够通过第一组同步信号的发送 信息, 确定出第二同步信号的发送时刻, 在这些发送时刻发送第二 同步信号, 因此, 基站 2可以通过选择第二同步信号的发送时刻而 实现与其他小区之间的干扰协调,可以避免基站与多个其他小区同 时发送第二同步信号,从而有效降低基站和其他小区在发送第二同 步信号时所产生的干扰, 因此, 能够有效提高 UE检测到第二同步 信号的可能性, 进而有效提高 UE的检测性能。 在本发明的一个实施例中, 还包括:
所述第一组同步信号只包括第一同步信号, 例如主同步信号; 第二同步信号例如为辅同步信号。 在本实施例中, 为方便描述, 上 述第一同步信号和第二同步信号的组合称为第二组同步信号。
所述第二组同步信号在无线帧的第一半帧和第二半帧的位置 是不同的。 例如, 所述第一半帧是一个无线帧的子帧 0到 4 , 所述 第二半帧是一个无线帧的子帧 5 到 9。 这样, UE可以根据第二组 同步信号在两个半帧的不同位置, 来确定载波类型和 /或帧定时信 息。 该载波类型包括后向兼容载波和新载波, 因为后向兼容载波上 PS S和 S S S在两个半帧的位置是相同的, 而在新载波上是不同的。 所述新载波一般是非后向兼容的, 即低版本的 UE不可以通过所述 新载波接入, 也不可以在所述新载波上驻留; 所述新载波的特征还 可以包括如下中的至少一种: 新载波上靠 ePDCCH 的公共搜索空 间接收公共控制信息, 比如调度系统消息、 寻呼消息, 随机接入应 答消息的 ePDCCH , 该 ePDCCH以信道信息预编码传输, 且资源分 配以物理资源块或物理资源块对为单位;新载波上的小区特定参考 信号不是每个子帧都发送, 比如 5个子帧发送一次; 新载波上只支 持基于 UE特定参考信号的传输模块; 等等。 具体地:
例如,第二组同步信号中的主同步信号和辅同步信号的相对位 置关系在第一半帧和第二半帧是相同的,比如主同步信号和辅同步 信号的符号相邻且主同步信号时间上在后, 其他也不排除。 但是, 第二组同步信号在两个半帧的绝对时域位置不同,比如符号位置不 同和 /或子帧位置不同。 符合上述条件的一个例子是: PS S 和 S S S 分别位于第一半帧的子帧 0 的第 2 个符号和第 3 个符号, P S S 和 S S S分别位于第二半帧的子帧 5的第 3个符号和第 4个符号, 其他 类似位置也不排除。 这样, UE检测到两个半帧的 PS S和 S S S后, 通过比较这两个半帧的第二组同步信号的不同时间间隔,就可以确 定帧定时, 比如如果 UE检测发现前一个半帧的第二组同步信号距 离后一个半帧的第二组同步信号的时间间隔为 5 个子帧还多一个 符号, 则 UE确定上述前一个半帧是一个无线帧的第一半帧, 上述 后一个半帧是一个无线帧的第二半帧; 反之, 如果 UE检测发现前 一个半帧的第二组同步信号距离后一个半帧的第二组同步信号的 时间间隔为 5个子帧但少一个符号, 则 UE确定上述前一个半帧是 一个无线帧的第二半帧, 上述后一个半帧是一个无线帧的第一半 帧。 进一步地, UE还可以通过上述类似的方法, 即通过两个半帧 的第二组同步信号的位置关系确定载波类型。 又例如,第二组同步信号中的主同步信号和辅同步信号的相对 位置关系在第一半帧和第二半帧是不同的, 比如 PS S 和 S S S 分别 位于第一半帧的子帧 0 的第 2 个符号和第 3 个符号, PS S 和 S S S 分别位于第二半帧的子帧 5的第 2个符号和第 4个符号。其他相比 符号位置也不排除, 或者也可以是子帧位置不同, 比如第二组同步 信号在两个半帧中 占用不同的子帧。 具体确定帧定时和 /或载波类 型的方法同上述实施例, 在此不再贅述。 基于上述第二组同步信号在两个半帧的不同位置, UE可以获 得帧同步信号, 和 /或, 载波类型信息, 且可以保证 UE 检测一组 P S S和 S S S的方法与现有机制, 即后弦兼容载波上的机制一样, 因 为 P S S 和 S S S 的相对位置可以保持不变, 这样可以大大减少小区 搜索的复杂度。
与前述同步信号的接收方法的实施例相对应,本发明实施例又 提供了一种 UE4 , 如图 1 1 所示, 包括: 检测单元 40 , 用于检测第一组同步信号以获取第一组同步信 号, 第一组同步信号中包括至少一个同步信号; 时刻确定单元 41 , 用于根据第一组同步信号的发送信息, 确 定所述第二同步信号的检测时刻;
检测单元 40还用于在时刻确定单元 41确定的检测时刻 ,检测 第二同步信号以获取第二同步信号。 本发明实施例提供的 UE4,可以通过第一同步信号的发送信息 确定出第二同步信号的检测时刻,并在第二同步信号的检测时刻检 测第二同步信号, 因此, 使得基站可以通过选择第二同步信号的发 送时刻而实现与其他小区之间的干扰协调,可以避免基站与多个其 他小区同时发送第二同步信号,从而有效降低基站和其他小区在发 送第二同步信号时所产生的干扰,UE4能够确定出第二同步信号的 检测时刻, 并在这些检测时刻检测第二同步信号, 因此能够有效提 高 UE4检测到第二同步信号的可能性,进而有效提高 UE的检测性 。 特别的, 在本发明的一个实施例中, 第二同步信号的发送周期 大于第一组同步信号中至少一个同步信号的发送周期。
可选的, 时刻确定单元 41 可采用如下两种方式确定第二同步 信号的候选时刻, 具体如下:
其一, 时刻确定单元 41 可根据所述发送信息, 以及所述发送 信息与第二同步信号的检测时刻的对应关系,确定第二同步信号的 检测时刻。
其二, 时刻确定单元 41 可首先确定第二同步信号的候选检测 时刻; 然后, 根据所述发送信息, 选择部分或全部候选检测时刻作 为所述第二同步信号的检测时刻。 例如, 时刻确定单元 41 可具体 用于:根据所述发送信息与所述第二同步信号的候选检测时刻的对 应关系,选择与所述发送信息对应的部分候选检测时刻作为所述第 二同步信号的检测时刻。 需要说明的是, 本发明实施例中, 第二同步信号可在检测时刻 中的全部或部分时刻发送。 可选的, 在本发明的一个实施例中, 第一组同步信号包括第一 同步信号,第一组同步信号的发送信息包括所述第一同步信号的发 送序列、 发送周期、 发送时刻中的至少一种。 具体的, 在本发明的一个实施例中, 第一组同步信号的发送信 息包括所述第一同步信号的发送周期, 如图 12所示, 该实施例的 UE还包括:
获取单元 42 , 用于获取第一同步信号的发送周期, 第一同步 信号的发送周期是预先设置的, 或者, 根据检测单元 40获取的第 一同步信号, 获取第一同步信号的发送周期。
作为该实施例的一种变形, 在本发明的另一个实施例中, 第一 组同步信号的发送信息包括第一同步信号的发送序列和 /或所述第 一同步信号的发送时刻, 此时, 获取单元 42用于获取第一同步信 号的发送周期, 第一同步信号的发送周期是预先设置的, 或者, 根 据检测单元 40获取的第一同步信号, 获取第一同步信号的发送周 期。 具体的, 在本发明的一个实施例中, 相邻的两个第一同步信号 的发送时刻之间包括至少两个所述确定的检测时刻,该至少两个检 测时刻包括第一检测时刻和第二检测时刻; 此时, 检测单元 40具体用于:
在第一检测时刻, 检测第二同步信号的第一序列集合, 在第二 检测时刻, 检测第二同步信号的第二序列集合, 第一序列集合中序 列的个数和所第二序列集合中序列的个数中的至少一者小于所述 第二同步信号需要指示的小区标识的总个数或小区组标识的总个 数。 可选的, 第一序列集合中的序列和所述第二序列集合中的序列 相同。
进一步的, 在本发明的一个实施例中, 第一组同步信号包括第 一同步信号, 如图 13所示, 该实施例提供的 UE还包括: 同步单元 43 , 用于根据第一同步信号, 进行符号同步, 子帧 同步和无线帧同步。 举例而言, 第一同步信号可以为主同步信号, 第二同步信号可 为辅同步信号。 具体的, 在本发明的另一个实施例, 第一组同步信号包括至少 两个同步信号,第一组同步信号的发送信息包括所述第一组同步信 号中至少一个同步信号指示的子帧和 /或无线帧定时信息; 此时, 检测单元 40具体用于: 分别检测第一组同步信号的所述至少 两个同步信号以获取所述至少两个同步信号。
进一步的, 如图 14所示, 该实施例的 UE还包括:
获取单元 44 , 用于从广播信道中获取无线帧号, 并通过检测 所述第一组同步信号中至少一个同步信号,获取所述第一组同步信 号中至少一个同步信号指示的子帧和 /或无线帧定时信息; 此时, 时刻确定单元 41具体用于:
根据获取单元 44获取的无线帧号、获取单元 44获取的第一组 同步信号中至少一个同步信号指示的子帧和 /或无线帧定时信息、 以及所述获取单元 44获取的无线帧号、所述获取单元 44获取的子 帧和 /或无线帧定时信息与第二同步信号的检测时刻的对应关系, 确定第二同步信号的检测时刻。
举例而言,第一组同步信号包括的至少两个同步信号包括主同 步信号和辅同步信号;第一组同步信号的发送信息包括主同步信号 和辅同步信号指示的子帧和 /或无线帧定时信息。
需要说明的是, 本发明实施例中, 第一组同步信号可通过相同 的小区发送,第一组同步信号和第二同步信号可通过相同的或不同 的小区发送。
与前述同步信号的接收方法的实施例相对应,本发明实施例又 提供了一种 UE5 , 如图 15所示, 包括处理器 50 , 通信接口 5 1 , 存 储器 52和总线 53 ; 其中, 处理器 50、 通信接口 5 1、 存储器 52通过总线 53完成 相互间的通信;
通信接口 5 1 , 用于与 UE5的外部设备通信;
存储器 52 , 用于存放程序 521
处理器 50 , 用于执行存储器 52存放的程序 521
其中, 所述程序 521 包括:
检测单元, 用于检测第一组同步信号以获取第一组同步信号, 所述第一组同步信号中包括至少一个同步信号; 时刻确定单元, 用于根据所述第一组同步信号的发送信息, 确 定所述第二同步信号的检测时刻;
所述检测单元还用于在所述时刻确定单元确定的检测时刻,检 测所述第二同步信号以获取第二同步信号。
可理解的是, 图 1 1 至图 14所示的实施例中各功能单元可包含 于所述程序中,各功能单元的具体工作方式请参见图 1 1 至图 14所 述的实施例和前述同步信号的发送方法的实施例, 此处不再贅述。 本发明实施例提供的 UE5,可以通过第一同步信号的发送信息 确定出第二同步信号的检测时刻,并在第二同步信号的检测时刻检 测第二同步信号, 因此, 使得基站可以通过选择第二同步信号的发 送时刻而实现与其他小区之间的干扰协调,可以避免基站与多个其 他小区同时发送第二同步信号,从而有效降低基站和其他小区在发 送第二同步信号时所产生的干扰,UE5能够确定出第二同步信号的 检测时刻, 并在这些检测时刻检测第二同步信号, 因此能够有效提 高 UE5检测到第二同步信号的可能性,进而有效提高 UE的检测性
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fi 。
同样与前述同步信号的发送方法的实施例相对应,本发明实施 例又提供了一种 UE6 , 如图 16所示, 包括处理器 60和存储器 61 , 图 1 1 至图 14所示的实施例中各功能单元包含于处理器 60 中, 各 功能单元的具体工作方式请参见图 1 1至图 14所示实施例和前述同 步信号的发送方法的实施例, 此处不再贅述。
本发明实施例提供的 UE6 ,可以通过第一同步信号的发送信息 确定出第二同步信号的检测时刻,并在第二同步信号的检测时刻检 测第二同步信号, 因此, 使得基站可以通过选择第二同步信号的发 送时刻而实现与其他小区之间的干扰协调,可以避免基站与多个其 他小区同时发送第二同步信号,从而有效降低基站和其他小区在发 送第二同步信号时所产生的干扰, UE6能够确定出第二同步信号的 检测时刻, 并在这些检测时刻检测第二同步信号, 因此能够有效提 高 UE6检测到第二同步信号的可能性,进而有效提高 UE的检测性
•6匕
fi 。 在本发明的一个实施例中, 还包括:
所述第一组同步信号只包括第一同步信号, 例如主同步信号; 第二同步信号例如为辅同步信号。 在本实施例中, 为方便描述, 上 述第一同步信号和第二同步信号的组合称为第二组同步信号。
所述第二组同步信号在无线帧的第一半帧和第二半帧的位置 是不同的。 例如, 所述第一半帧是一个无线帧的子帧 0到 4 , 所述 第二半帧是一个无线帧的子帧 5 到 9。 这样, UE可以根据第二组 同步信号在两个半帧的不同位置, 来确定载波类型和 /或帧定时信 息。 该载波类型包括后向兼容载波和新载波, 因为后向兼容载波上
PS S和 S S S在两个半帧的位置是相同的, 而在新载波上是不同的。 所述新载波一般是非后向兼容的, 即低版本的 UE不可以通过所述 新载波接入, 也不可以在所述新载波上驻留; 所述新载波的特征还 可以包括如下中的至少一种: 新载波上靠 ePDCCH 的公共搜索空 间接收公共控制信息, 比如调度系统消息、 寻呼消息, 随机接入应 答消息的 ePDCCH , 该 ePDCCH以信道信息预编码传输, 且资源分 配以物理资源块或物理资源块对为单位;新载波上的小区特定参考 信号不是每个子帧都发送, 比如 5个子帧发送一次; 新载波上只支 持基于 UE特定参考信号的传输模块; 等等。 具体地:
例如,第二组同步信号中的主同步信号和辅同步信号的相对位 置关系在第一半帧和第二半帧是相同的,比如主同步信号和辅同步 信号的符号相邻且主同步信号时间上在后, 其他也不排除。 但是, 第二组同步信号在两个半帧的绝对时域位置不同,比如符号位置不 同和 /或子帧位置不同。 符合上述条件的一个例子是: PS S 和 S S S 分别位于第一半帧的子帧 0 的第 2 个符号和第 3 个符号, P S S 和 S S S分别位于第二半帧的子帧 5的第 3个符号和第 4个符号, 其他 类似位置也不排除。 这样, UE检测到两个半帧的 PS S和 S S S后, 通过比较这两个半帧的第二组同步信号的不同时间间隔,就可以确 定帧定时, 比如如果 UE检测发现前一个半帧的第二组同步信号距 离后一个半帧的第二组同步信号的时间间隔为 5 个子帧还多一个 符号, 则 UE确定上述前一个半帧是一个无线帧的第一半帧, 上述 后一个半帧是一个无线帧的第二半帧; 反之, 如果 UE检测发现前 一个半帧的第二组同步信号距离后一个半帧的第二组同步信号的 时间间隔为 5个子帧但少一个符号, 则 UE确定上述前一个半帧是 一个无线帧的第二半帧, 上述后一个半帧是一个无线帧的第一半 帧。 进一步地, UE还可以通过上述类似的方法, 即通过两个半帧 的第二组同步信号的位置关系确定载波类型。
又例如,第二组同步信号中的主同步信号和辅同步信号的相对 位置关系在第一半帧和第二半帧是不同的, 比如 PSS 和 SSS 分别 位于第一半帧的子帧 0 的第 2 个符号和第 3 个符号, PSS 和 SSS 分别位于第二半帧的子帧 5的第 2个符号和第 4个符号。其他相比 符号位置也不排除, 或者也可以是子帧位置不同, 比如第二组同步 信号在两个半帧中 占用不同的子帧。 具体确定帧定时和 /或载波类 型的方法同上述实施例, 在此不再贅述。
基于上述第二组同步信号在两个半帧的不同位置, UE可以获 得帧同步信号, 和 /或, 载波类型信息, 且可以保证 UE 检测一组 PSS和 SSS的方法与现有机制, 即后弦兼容载波上的机制一样, 因 为 PSS 和 SSS 的相对位置可以保持不变, 这样可以大大减少小区 搜索的复杂度。
本领域普通技术人员可以理解: 实现上述方法实施例的全部或 部分流程可以通过计算机程序指令相关的硬件来完成,前述的程序 可以存储于一计算机可读取存储介质中, 该程序在执行时, 执行包 括上述方法实施例的步骤; 而前述的存储介质包括: ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的介质。
以上, 仅为本发明的具体实施方式, 但本发明的保护范围并不 局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范 围内,可轻易想到变化或替换,都应涵盖在本发明的保护范围之内。 因此, 本发明的保护范围应以权利要求的保护范围为准。

Claims

权 利 要 求 书
1、 一种同步信号的发送方法, 其特征在于, 包括: 确定第一组同步信号的发送信息, 所述第一组同步信号包括至 少一个同步信号;
根据所述发送信息确定第二同步信号的发送时刻;
根据所述第二同步信号的发送时刻发送所述第二同步信号。
2、 根据权利要求 1所述的发送方法, 其特征在于, 所述第二同 步信号的发送周期大于所述第一组同步信号中至少一个同步信号的 发送周期。
3、 根据权利要求 1所述的发送方法, 其特征在于, 所述第二同 步信号的发送时刻与其他小区中的至少一个小区发送的第二同步信 号的发送时刻不同。
4、 根据权利要求 1至 3 中任意一项所述的发送方法, 其特征在 于, 所述根据所述发送信息确定第二同步信号的发送时刻包括: 根据所述发送信息确定所述第二同步信号的候选发送时刻; 在所述确定的候选发送时刻中, 选择部分或全部候选发送时刻 作为所述第二同步信号的发送时刻。
5、 根据权利要求 4所述的发送方法, 其特征在于, 所述根据所 述发送信息确定所述第二同步信号的候选发送时刻包括:
根据所述发送信息, 以及所述发送信息与所述第二同步信号的 候选发送时刻的对应关系,确定所述第二同步信号的候选发送时刻。
6、 根据权利要求 1至 3 中任意一项所述的发送方法, 其特征在 于, 所述根据所述发送信息确定第二同步信号的发送时刻包括: 根据所述发送信息、 以及所述发送信息与第二同步信号的发送 时刻的对应关系, 确定所述第二同步信号的发送时刻。
7、 根据权利要求 1至 3 中任意一项所述的发送方法, 其特征在 于, 所述根据所述发送信息确定第二同步信号的发送时刻包括: 确定所述第二同步信号的候选发送时刻;
根据所述发送信息, 选择部分或全部候选发送时刻作为所述第 二同步信号的发送时刻。
8、 根据权利要求 1至 7 中任意一项所述的发送方法, 其特征在 于,
所述第一组同步信号包括第一同步信号;
所述第一组同步信号的发送信息包括所述第一同步信号的发送 序列、 发送周期、 发送时刻中的至少一种。
9、 根据权利要求 8所述的发送方法, 其特征在于, 所述第一同步信号为主同步信号; 所述第二同步信号为辅同步信号。
10、 根据权利要求 1至 7 中任意一项所述的发送方法, 其特征 在于,
所述第一组同步信号包括至少两个同步信号;
所述第一组同步信号的发送信息包括所述第一组同步信号中至 少一个同步信号指示的子帧和 /或无线帧定时信息。
1 1、 根据权利要求 10所述的发送方法, 其特征在于, 所述至少两个同步信号包括主同步信号和辅同步信号; 所述第一组同步信号的发送信息包括所述主同步信号和所述辅 同步信号指示的子帧和 /或无线帧定时信息。
12、 根据权利要求 1至 1 1 中任意一项所述的发送方法, 其特征 在于,
所述第一组同步信号通过相同的小区发送;
所述第一组同步信号和所述第二同步信号通过相同的或不同的 小区发送。
13、 一种同步信号的接收方法, 其特征在于, 包括: 检测第一组同步信号以获取第一组同步信号, 所述第一组同步 信号中包括至少一个同步信号;
根据所述第一组同步信号的发送信息, 确定所述第二同步信号 的检测时刻; 在所述确定的检测时刻, 检测所述第二同步信号以获取第二同 步信号。
14、 根据权利要求 13所述的接收方法, 其特征在于, 所述获取 到的第二同步信号的发送周期大于所述第一组同步信号中至少一个 同步信号的发送周期。
15、 根据权利要求 13或 14所述的接收方法, 其特征在于, 所 述根据所述第一组同步信号的发送信息, 确定所述第二同步信号的 检测时刻包括: 根据所述发送信息, 以及所述发送信息与所述第二同步信号的 检测时刻的对应关系, 确定所述第二同步信号的检测时刻。
16、 根据权利要求 13或 14所述的接收方法, 其特征在于, 所 述根据所述第一组同步信号的发送信息, 确定所述第二同步信号的 检测时刻包括: 确定所述第二同步信号的候选检测时刻;
根据所述发送信息, 选择部分或全部候选检测时刻作为所述第 二同步信号的检测时刻。
17、 根据权利要求 16所述的接收方法, 其特征在于, 所述根据 所述发送信息, 选择部分候选检测时刻作为所述第二同步信号的检 测时刻包括: 根据所述发送信息与所述第二同步信号的候选检测时刻的对应 关系, 选择与所述发送信息对应的部分候选检测时刻作为所述第二 同步信号的检测时刻。
1 8、 根据权利要求 13至 17 中任意一项所述的接收方法, 其特 征在于, 所述第二同步信号在所述检测时刻中的全部或部分时刻发送。
19、 根据权利要求 13至 1 8 中任意一项所述的接收方法, 其特 征在于,
所述第一组同步信号包括第一同步信号;
所述第一组同步信号的发送信息包括所述第一同步信号的发送 序列、 发送周期、 发送时刻中的至少一种。
20、 根据权利要求 19所述的接收方法, 其特征在于,
所述第一组同步信号的发送信息包括所述第一同步信号的发送 周期;
所述方法还包括:
获取所述第一同步信号的发送周期, 所述第一同步信号的发送 周期是预先设置的; 或者,
根据所述获取的第一同步信号, 获取所述第一同步信号的发送 周期。
21、 根据权利要求 19所述的接收方法, 其特征在于, 所述第一 组同步信号的发送信息包括所述第一同步信号的发送序列和 /或所 述第一同步信号的发送时刻;
所述方法还包括: 根据所述获取的第一组同步信号, 获取所述第一同步信号的发 送序列和 /或所述第一同步信号的发送时刻。
22、 根据权利要求 19至 21 中任意一项所述的接收方法, 其特 征在于,
相邻的两个所述第一同步信号的发送时刻之间包括至少两个所 述确定的检测时刻, 所述至少两个检测时刻包括第一检测时刻和第 二检测时刻; 在所述确定的检测时刻, 检测所述第二同步信号以获取第二同 步信号包括:
在所述第一检测时刻,检测所述第二同步信号的第一序列集合, 在所述第二检测时刻, 检测所述第二同步信号的第二序列集合, 所 述第一序列集合中序列的个数和所述第二序列集合中序列的个数中 的至少一者小于所述第二同步信号需要指示的小区标识的总个数或 小区组标识的总个数。
23、 根据权利要求 22所述的接收方法, 其特征在于, 所述第一 序列集合中的序列和所述第二序列集合中的序列相同。
24、 根据权利要求 19至 23任意一项所述的接收方法, 其特征 在于, 所述方法还包括: 根据所述第一同步信号, 进行符号同步, 子帧同步和无线帧同 步。
25、 根据权利要求 19至 24任一项所述的接收方法, 其特征在 于,
所述第一同步信号为主同步信号; 所述第二同步信号为辅同步信号。
26、 根据权利要求 13至 1 8任一项所述的接收方法, 其特征在 于,
所述第一组同步信号包括至少两个同步信号;
所述第一组同步信号的发送信息包括所述第一组同步信号中至 少一个同步信号指示的子帧和 /或无线帧定时信息;
所述检测第一组同步信号以获取第一组同步信号包括: 分别检 测所述第一组同步信号的所述至少两个同步信号以获取所述至少两 个同步信号。
27、 根据权利要求 26所述的接收方法, 其特征在于, 所述方法 还包括: 从广播信道中获取无线帧号; 根据所述获取的第一组同步信号, 获取所述第一组同步信号中 至少一个同步信号指示的子帧和 /或无线帧定时信息;
所述根据所述第一组同步信号的发送信息, 确定所述第二同步 信号的检测时刻包括: 根据所述获取的无线帧号、 所述获取的第一组同步信号中至少 一个同步信号指示的子帧和 /或无线帧定时信息、 以及所述获取的无 线帧号、 所述获取的子帧和 /或无线帧定时信息与第二同步信号的检 测时刻的对应关系, 确定所述第二同步信号的检测时刻。
28、 根据权利要求 26-27任一项所述的接收方法, 其特征在于, 所述至少两个同步信号包括主同步信号和辅同步信号; 所述第一组同步信号的发送信息包括所述主同步信号和所述辅 同步信号指示的子帧和 /或无线帧定时信息。
29、 根据权利要求 13-28任一项所述的接收方法, 其特征在于, 所述第一组同步信号通过相同的小区发送;
所述第一组同步信号和所述第二同步信号通过相同的或不同的 小区发送。
30、 一种基站, 其特征在于, 包括: 信息确定单元, 用于确定第一组同步信号的发送信息, 所述第 一组同步信号包括至少一个同步信号; 时刻确定单元, 用于根据所述信息确定单元确定的发送信息确 定第二同步信号的发送时刻; 发送单元, 用于根据所述时刻确定单元确定的第二同步信号的 发送时刻发送所述第二同步信号。
3 1、 根据权利要求 30所述的基站, 其特征在于, 所述第二同步 信号的发送周期大于所述第一组同步信号中至少一个同步信号的发 送周期。
32、 根据权利要求 3 1所述的基站, 其特征在于, 所述第二同步 信号的发送时刻与其他小区中的至少一个小区发送的第二同步信号 的发送时刻不同。
33、 根据权利要求 30至 32 中任意一项所述的基站, 其特征在 于, 所述时刻确定单元具体用于: 根据所述信息确定单元确定的发送信息确定所述第二同步信号 的候选发送时刻;
在所述确定的候选发送时刻中, 选择部分或全部候选发送时刻 作为所述第二同步信号的发送时刻。
34、 根据权利要求 33所述的基站, 其特征在于, 所述时刻确定 单元具体用于: 根据所述信息确定单元确定的发送信息, 以及所述发送信息与 所述第二同步信号的候选发送时刻的对应关系, 确定所述第二同步 信号的候选发送时刻。
35、 根据权利要求 30至 32 中任意一项所述的基站, 其特征在 于, 所述时刻确定单元具体用于: 根据所述信息确定单元确定的发送信息、 以及所述发送信息与 第二同步信号的发送时刻的对应关系, 确定所述第二同步信号的发 送时刻。
36、 根据权利要求 30至 32 中任意一项所述的基站, 其特征在 于, 所述时刻确定单元具体用于: 确定所述第二同步信号的候选发送时刻; 根据所述信息确定单元确定的发送信息, 选择部分或全部候选 发送时刻作为所述第二同步信号的发送时刻。
37、 根据权利要求 30至 36 中任意一项所述的基站, 其特征在 于,
所述第一组同步信号包括第一同步信号; 所述信息确定单元确定的所述第一组同步信号的发送信息包括 所述第一同步信号的发送序列、 发送周期、 发送时刻中的至少一种。
3 8、 根据权利要求 37所述的基站, 其特征在于, 所述第一同步信号为主同步信号; 所述第二同步信号为辅同步信号。
39、 根据权利要求 30至 36 中任意一项所述的基站, 其特征在 于,
所述第一组同步信号包括至少两个同步信号; 所述信息确定单元确定的所述第一组同步信号的发送信息包括 所述第一组同步信号中至少一个同步信号指示的子帧和 /或无线帧 定时信息。
40、 根据权利要求 39所述的基站, 其特征在于, 所述至少两个同步信号包括主同步信号和辅同步信号; 所述信息确定单元确定的所述第一组同步信号的发送信息包括 所述主同步信号和所述辅同步信号指示的子帧和 /或无线帧定时信 息。
41、 根据权利要求 30至 40任意一项所述的基站, 其特征在于, 所述第一组同步信号通过相同的小区发送;
所述第一组同步信号和所述第二同步信号通过相同的或不同的 小区发送。
42、 一种用户设备, 其特征在于, 包括: 检测单元, 用于检测第一组同步信号以获取第一组同步信号, 所述第一组同步信号中包括至少一个同步信号; 时刻确定单元, 用于根据所述第一组同步信号的发送信息, 确 定所述第二同步信号的检测时刻;
所述检测单元还用于在所述时刻确定单元确定的检测时刻, 检 测所述第二同步信号以获取第二同步信号。
43、 根据权利要求 42所述的用户设备, 其特征在于, 所述第二 同步信号的发送周期大于所述第一组同步信号中至少一个同步信号 的发送周期。
44、 根据权利要求 42或 43所述的用户设备, 其特征在于, 所 述时刻确定单元具体用于: 根据所述发送信息, 以及所述发送信息与所述第二同步信号的 检测时刻的对应关系, 确定所述第二同步信号的检测时刻。
45、 根据权利要求 42或 43所述的用户设备, 其特征在于, 所 述时刻确定单元具体用于: 确定所述第二同步信号的候选检测时刻;
根据所述发送信息, 选择部分或全部候选检测时刻作为所述第 二同步信号的检测时刻。
46、 根据权利要求 45所述的用户设备, 其特征在于, 所述时刻 确定单元具体用于: 根据所述发送信息与所述第二同步信号的候选检测时刻的对应 关系, 选择与所述发送信息对应的部分候选检测时刻作为所述第二 同步信号的检测时刻。
47、 根据权利要求 42至 46 中任意一项所述的用户设备, 其特 征在于,
所述第二同步信号在所述检测时刻中的全部或部分时刻发送。
48、 根据权利要求 42至 47 中任意一项所述的用户设备, 其特 征在于,
所述第一组同步信号包括第一同步信号;
所述第一组同步信号的发送信息包括所述第一同步信号的发送 序列、 发送周期、 发送时刻中的至少一种。
49、 根据权利要求 48所述的用户设备, 其特征在于, 所述第一组同步信号的发送信息包括所述第一同步信号的发送 周期;
所述用户设备还包括: 获取单元, 用于获取所述第一同步信号的发送周期, 所述第一 同步信号的发送周期是预先设置的, 或者, 根据所述检测单元获取 的第一同步信号, 获取所述第一同步信号的发送周期。
50、 根据权利要求 48所述的用户设备, 其特征在于, 所述第一组同步信号的发送信息包括所述第一同步信号的发送 序列和 /或所述第一同步信号的发送时刻; 所述用户设备还包括: 获取单元, 用于获取所述第一同步信号的发送周期, 所述第一 同步信号的发送周期是预先设置的, 或者, 根据所述检测单元获取 的第一同步信号, 获取所述第一同步信号的发送周期。
5 1、 根据权利要求 48至 50 中任意一项所述的用户设备, 其特 征在于,
相邻的两个所述第一同步信号的发送时刻之间包括至少两个所 述确定的检测时刻, 所述至少两个检测时刻包括第一检测时刻和第 二检测时刻;
所述检测单元具体用于: 在所述第一检测时刻,检测所述第二同步信号的第一序列集合, 在所述第二检测时刻, 检测所述第二同步信号的第二序列集合, 所 述第一序列集合中序列的个数和所述第二序列集合中序列的个数中 的至少一者小于所述第二同步信号需要指示的小区标识的总个数或 小区组标识的总个数。
52、 根据权利要求 5 1所述的用户设备, 其特征在于, 所述第一 序列集合中的序列和所述第二序列集合中的序列相同。
53、 根据权利要求 48至 52任意一项所述的用户设备, 其特征 在于, 所述用户设备还包括: 同步单元, 用于根据所述第一同步信号, 进行符号同步, 子帧 同步和无线帧同步。
54、 根据权利要求 48至 53任一项所述的用户设备, 其特征在 于,
所述第一同步信号为主同步信号; 所述第二同步信号为辅同步信号。
55、 根据权利要求 42至 47任一项所述的用户设备, 其特征在 于,
所述第一组同步信号包括至少两个同步信号;
所述第一组同步信号的发送信息包括所述第一组同步信号中至 少一个同步信号指示的子帧和 /或无线帧定时信息;
所述检测单元具体用于: 分别检测所述第一组同步信号的所述 至少两个同步信号以获取所述至少两个同步信号。
56、 根据权利要求 55所述的用户设备, 其特征在于, 所述用户 设备还包括: 获取单元, 用于从广播信道中获取无线帧号, 并通过检测所述 第一组同步信号中至少一个同步信号, 获取所述第一组同步信号中 至少一个同步信号指示的子帧和 /或无线帧定时信息;
所述时刻确定单元具体用于: 根据所述获取的无线帧号、 所述获取的第一组同步信号中至少 一个同步信号指示的子帧和 /或无线帧定时信息、 以及所述获取的无 线帧号、 所述获取的子帧和 /或无线帧定时信息与第二同步信号的检 测时刻的对应关系, 确定所述第二同步信号的检测时刻。
57、 根据权利要求 55-56任一项所述的用户设备, 其特征在于, 所述至少两个同步信号包括主同步信号和辅同步信号;
所述第一组同步信号的发送信息包括所述主同步信号和所述辅 同步信号指示的子帧和 /或无线帧定时信息。
58、 根据权利要求 42-57任一项所述的用户设备, 其特征在于, 所述第一组同步信号通过相同的小区发送;
所述第一组同步信号和所述第二同步信号通过相同的或不同的 小区发送。
59、 一种基站, 其特征在于, 所述基站包括处理器, 通信接口, 存储器和总线; 其中, 处理器、 通信接口、 存储器通过总线完成相互间的通信; 所述通信接口, 用于与外部设备通信;
所述存储器, 用于存放程序;
所述处理器, 用于执行所述程序; 其中, 所述程序包括: 信息确定单元, 用于确定第一组同步信号的发送信息, 所述第 一组同步信号包括至少一个同步信号; 时刻确定单元, 用于根据所述信息确定单元确定的发送信息确 定第二同步信号的发送时刻; 发送单元, 用于根据所述时刻确定单元确定的第二同步信号的 发送时刻发送所述第二同步信号。
60、 根据权利要求 59所述的基站, 其特征在于, 所述第二同步 信号的发送周期大于所述第一组同步信号中至少一个同步信号的发 送周期。
61、 根据权利要求 60所述的基站, 其特征在于, 所述第二同步 信号的发送时刻与其他小区中的至少一个小区发送的第二同步信号 的发送时刻不同。
62、 根据权利要求 59至 61 中任意一项所述的基站, 其特征在 于, 所述时刻确定单元具体用于: 根据所述信息确定单元确定的发送信息确定所述第二同步信号 的候选发送时刻;
在所述确定的候选发送时刻中, 选择部分或全部候选发送时刻 作为所述第二同步信号的发送时刻。
63、 根据权利要求 62所述的基站, 其特征在于, 所述时刻确定 单元具体用于: 根据所述信息确定单元确定的发送信息, 以及所述发送信息与 所述第二同步信号的候选发送时刻的对应关系, 确定所述第二同步 信号的候选发送时刻。
64、 根据权利要求 59至 6 1 中任意一项所述的基站, 其特征在 于, 所述时刻确定单元具体用于: 根据所述信息确定单元确定的发送信息、 以及所述发送信息与 第二同步信号的发送时刻的对应关系, 确定所述第二同步信号的发 送时刻。
65、 根据权利要求 59至 6 1 中任意一项所述的基站, 其特征在 于, 所述时刻确定单元具体用于: 确定所述第二同步信号的候选发送时刻;
根据所述信息确定单元确定的发送信息, 选择部分或全部候选 发送时刻作为所述第二同步信号的发送时刻。
66、 根据权利要求 59至 65 中任意一项所述的基站, 其特征在 于,
所述第一组同步信号包括第一同步信号; 所述信息确定单元确定的所述第一组同步信号的发送信息包括 所述第一同步信号的发送序列、 发送周期、 发送时刻中的至少一种。
67、 根据权利要求 66所述的基站, 其特征在于, 所述第一同步信号为主同步信号; 所述第二同步信号为辅同步信号。
68、 根据权利要求 59至 65 中任意一项所述的基站, 其特征在 于,
所述第一组同步信号包括至少两个同步信号; 所述信息确定单元确定的所述第一组同步信号的发送信息包括 所述第一组同步信号中至少一个同步信号指示的子帧和 /或无线帧 定时信息。
69、 根据权利要求 68所述的基站, 其特征在于, 所述至少两个同步信号包括主同步信号和辅同步信号; 所述信息确定单元确定的所述第一组同步信号的发送信息包括 所述主同步信号和所述辅同步信号指示的子帧和 /或无线帧定时信 息。
70、 根据权利要求 59至 69任意一项所述的基站, 其特征在于, 所述第一组同步信号通过相同的小区发送;
所述第一组同步信号和所述第二同步信号通过相同的或不同的 小区发送。
71、 一种用户设备, 其特征在于, 所述用户装备包括处理器, 通信接口, 存储器和总线;
其中, 处理器、 通信接口、 存储器通过总线完成相互间的通信; 所述通信接口, 用于与外部设备通信; 所述存储器, 用于存放程序;
所述处理器, 用于执行所述程序;
其中, 所述程序包括:
检测单元, 用于检测第一组同步信号以获取第一组同步信号, 所述第一组同步信号中包括至少一个同步信号; 时刻确定单元, 用于根据所述第一组同步信号的发送信息, 确 定所述第二同步信号的检测时刻;
所述检测单元还用于在所述时刻确定单元确定的检测时刻, 检 测所述第二同步信号以获取第二同步信号。
72、 根据权利要求 71所述的用户设备, 其特征在于, 所述第二 同步信号的发送周期大于所述第一组同步信号中至少一个同步信号 的发送周期。
73、 根据权利要求 71或 72所述的用户设备, 其特征在于, 所 述时刻确定单元具体用于: 根据所述发送信息, 以及所述发送信息与所述第二同步信号的 检测时刻的对应关系, 确定所述第二同步信号的检测时刻。
74、 根据权利要求 71或 72所述的用户设备, 其特征在于, 所 述时刻确定单元具体用于: 确定所述第二同步信号的候选检测时刻;
根据所述发送信息, 选择部分或全部候选检测时刻作为所述第 二同步信号的检测时刻。
75、 根据权利要求 74所述的用户设备, 其特征在于, 所述时刻 确定单元具体用于: 根据所述发送信息与所述第二同步信号的候选检测时刻的对应 关系, 选择与所述发送信息对应的部分候选检测时刻作为所述第二 同步信号的检测时刻。
76、 根据权利要求 71 至 75 中任意一项所述的用户设备, 其特 征在于,
所述第二同步信号在所述检测时刻中的全部或部分时刻发送。
77、 根据权利要求 71 至 76 中任意一项所述的用户设备, 其特 征在于,
所述第一组同步信号包括第一同步信号;
所述第一组同步信号的发送信息包括所述第一同步信号的发送 序列、 发送周期、 发送时刻中的至少一种。
78、 根据权利要求 77所述的用户设备, 其特征在于, 所述第一组同步信号的发送信息包括所述第一同步信号的发送 周期;
所述程序还包括: 获取单元, 用于获取所述第一同步信号的发送周期, 所述第一 同步信号的发送周期是预先设置的, 或者, 根据所述检测单元获取 的第一同步信号, 获取所述第一同步信号的发送周期。
79、 根据权利要求 77所述的用户设备, 其特征在于, 所述第一组同步信号的发送信息包括所述第一同步信号的发送 序列和 /或所述第一同步信号的发送时刻; 所述程序还包括: 获取单元, 用于获取所述第一同步信号的发送周期, 所述第一 同步信号的发送周期是预先设置的, 或者, 根据所述检测单元获取 的第一同步信号, 获取所述第一同步信号的发送周期。
80、 根据权利要求 77至 79 中任意一项所述的用户设备, 其特 征在于,
相邻的两个所述第一同步信号的发送时刻之间包括至少两个所 述确定的检测时刻, 所述至少两个检测时刻包括第一检测时刻和第 二检测时刻;
所述检测单元具体用于: 在所述第一检测时刻,检测所述第二同步信号的第一序列集合, 在所述第二检测时刻, 检测所述第二同步信号的第二序列集合, 所 述第一序列集合中序列的个数和所述第二序列集合中序列的个数中 的至少一者小于所述第二同步信号需要指示的小区标识的总个数或 小区组标识的总个数。
81、 根据权利要求 80所述的用户设备, 其特征在于, 所述第一 序列集合中的序列和所述第二序列集合中的序列相同。
82、 根据权利要求 77至 81任意一项所述的用户设备, 其特征 在于, 所述用户设备还包括: 同步单元, 用于根据所述第一同步信号, 进行符号同步, 子帧 同步和无线帧同步。
83、 根据权利要求 77至 82任一项所述的用户设备, 其特征在 于,
所述第一同步信号为主同步信号; 所述第二同步信号为辅同步信号。
84、 根据权利要求 71 至 76任一项所述的用户设备, 其特征在 于,
所述第一组同步信号包括至少两个同步信号; 所述第一组同步信号的发送信息包括所述第一组同步信号中至 少一个同步信号指示的子帧和 /或无线帧定时信息;
所述检测单元具体用于: 分别检测所述第一组同步信号的所述 至少两个同步信号以获取所述至少两个同步信号。
85、 根据权利要求 84所述的用户设备, 其特征在于, 所述程序 还包括: 获取单元, 用于从广播信道中获取无线帧号, 并通过检测所述 第一组同步信号中至少一个同步信号, 获取所述第一组同步信号中 至少一个同步信号指示的子帧和 /或无线帧定时信息;
所述时刻确定单元具体用于: 根据所述获取的无线帧号、 所述获取的第一组同步信号中至少 一个同步信号指示的子帧和 /或无线帧定时信息、 以及所述获取的无 线帧号、 所述获取的子帧和 /或无线帧定时信息与第二同步信号的检 测时刻的对应关系, 确定所述第二同步信号的检测时刻。
86、 根据权利要求 84- 85任一项所述的用户设备, 其特征在于, 所述至少两个同步信号包括主同步信号和辅同步信号;
所述第一组同步信号的发送信息包括所述主同步信号和所述辅 同步信号指示的子帧和 /或无线帧定时信息。
87、 根据权利要求 7 1 - 86任一项所述的用户设备, 其特征在于, 所述第一组同步信号通过相同的小区发送;
所述第一组同步信号和所述第二同步信号通过相同的或不同的 小区发送。
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