WO2016070693A1 - Method and device for transmitting preamble signal - Google Patents
Method and device for transmitting preamble signal Download PDFInfo
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- WO2016070693A1 WO2016070693A1 PCT/CN2015/090926 CN2015090926W WO2016070693A1 WO 2016070693 A1 WO2016070693 A1 WO 2016070693A1 CN 2015090926 W CN2015090926 W CN 2015090926W WO 2016070693 A1 WO2016070693 A1 WO 2016070693A1
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
Definitions
- the present application relates to the field of communications technologies, and in particular, to a method and a device for transmitting a preamble signal.
- LTE Long Term Evolution
- U-LTE or LTE-U unlicensed LTE
- the unlicensed spectrum does not have a specific application system, and can be shared by various wireless communication systems such as Bluetooth, WiFi, etc., and the shared unlicensed spectrum resources are used by multiple systems by preempting resources. Therefore, the coexistence of LTE-U deployed by different operators and wireless communication systems such as LTE-U and WiFi is a key point and difficulty in research.
- the 3GPP requires that the wireless coexistence of LTE-U and wireless communication systems such as WiFi be guaranteed.
- the unlicensed frequency band is used as a secondary carrier to be assisted by the primary carrier of the licensed frequency band. Listening before Talk (LBT) is the basic means of LTE-U competitive access, which is approved by almost all companies.
- LBT Listening before Talk
- the essence of LBT technology is still that the 802.11 system adopts the carrier sense/collision avoidance (CSMA/CA) mechanism.
- the way in which the WiFi system preempts resources on the unlicensed spectrum includes: first, listening to the channel, when the channel idle time reaches the DCF interframe distance (DCF Inter-Frame Space, DIFS; DCF, distributed channel access, distributed channel access), it is judged that the current channel is an idle channel, and then each station waiting for access to the channel enters a random back-off phase for Avoid multiple sites colliding on the same resources.
- DIFS DCF Inter-Frame Space
- DCF distributed channel access
- distributed channel access distributed channel access
- the LTE system supports both FDD and TDD duplex modes, and the two duplex modes use different frame structures. Common to both frame structures is that each radio frame consists of 10 1 ms subframes.
- the first type of frame structure used by the FDD system is shown in Figure 1, and the second type of frame structure used by the TDD system is shown in Figure 2.
- the primary carrier and the secondary carrier are also synchronized in time. Since the time when the LTE-U monitors the channel and judges to be "free" is random, LTE-U letter
- the starting time of the number transmission may be any position of a certain subframe.
- the base station may not be able to send the control channel and data in time due to factors such as data preparation or radio frequency. . It can be seen from the LTE frame structure that the signal transmission is in units of 1 ms subframes.
- LTE-U does not send a signal after robbing the channel, it will inevitably be snatched by other nodes in the case of fierce competition, which greatly reduces the number of frames.
- the competitive access capability of LTE-U is unlikely to be adopted.
- a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) sequence are located in the first subframe and the fifth subframe of each radio frame.
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the probability that the subframe of the contention access is not a PSS subframe is large. Therefore, according to the conventional method of LTE, the subframe cannot be decoded in real time, which inevitably affects the hybrid automatic retransmission (Hybrid-ARQ, HARQ) process.
- the frame is a PSS subframe but the access time cannot be synchronized after the PSS. Because the synchronization is not timely, the base station cannot receive the acknowledgement (ACK) message of some previous subframes, and can only retransmit, which is acceptable for LTE, but for LTE-U with limited transmission time, resource waste serious.
- ACK acknowledgement
- the number of user equipments (UEs) served by a single small cell transmission point (TP) is small, so the traffic load of a single small cell/TP in different time periods. If the small cell/TP has no service transmission, you can use the small cell on/off technology to enable or disable the small cell/TP according to the actual service situation. In order to enable the UE to discover the closed small cell/TP so that the UE can have the closed cell when there is a service transmission, the small cell/TP needs to periodically send the discovery signal.
- the discovery signal includes the PSS/SSS/Common Reference Signal (CRS), and the channel state information reference signal can also be configured.
- CRS PSS/SSS/Common Reference Signal
- CSI-RS Channel State Information Reference Signal
- the signal is found.
- the length can be configured, the FDD is 1 to 5 subframes, and the TDD is 2 to 4 subframes.
- the unlicensed band also transmits the discovery signal periodically like the small cell
- the PSS/SSS/CRS sequence is configured in the discovery signal
- a very possible implementation scheme is to realize the time and frequency synchronization by using the discovery signal.
- the discovery signal is intermittently interrupted by WiFi interference, the coarse frequency offset and the coarse symbol timing are not much problematic, such as fractional multiple frequency offset.
- the timing synchronization between fine and fine symbols may be lost; in the third case, the deployment of 802.11ac can occupy 80M or 160M bandwidth of the unlicensed band, and the competition in the hot spot is fierce, and the discovery signal is sparse and the signal is easily collided with the WiFi signal, which may result in For a long time, it is found that the signal cannot be received normally and the coarse synchronization is lost. Except for the scenario where the signal is found to be invalid, the unlicensed band has a large number of selectable frequency points. For the UE, the discovery signal needs to be received at all frequency points, and the complexity and power consumption are higher than the small cell case. It is found that the signal has a large overhead for occupying multiple subframes, so it is also necessary to consider the discovery of signal failure or a possible discovery signal alternative from a technical point of view.
- the embodiment of the present application provides a method and a device for transmitting a preamble signal, which are used to implement a vacancy in an unlicensed spectrum of an LTE system by using a preamble signal, thereby implementing an LTE system working on an unlicensed spectrum.
- the base station determines a preamble signal to be transmitted when randomly accessing the channel on the unlicensed spectrum
- the base station sends the preamble signal to the UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
- the base station determines a preamble signal to be transmitted, and the base station accesses the full bandwidth or part of the bandwidth of the channel on the unlicensed spectrum, and the preamble signal is used.
- the LTE system is occupied by the preamble signal on the unlicensed spectrum.
- the time for the LTE-U base station to access the channel is random, or the access time is the starting position of the subframe.
- the base station is not ready to send data.
- the placeholder must be sent.
- the LTE-U base station is occupied by the preamble signal provided in the method, so that the preamble signal can assist the discovery signal to implement the synchronization of the UE.
- the LTE system can work on the unlicensed spectrum.
- the start time of the preamble signal is the time of the base station random access channel
- the termination time of the preamble signal is before the data symbol and the transmission time of the control signaling.
- the preamble signal is a preamble signal including at least one of the first part, the second part and the third part, wherein the first part has a time length of a non-integer number of orthogonal frequency division multiplexing (OFDM) symbols
- the length, the length of time of the second part and the third part are all integer multiples of the length of the OFDM symbol.
- the preamble signal to be transmitted is determined, including:
- determining that the preamble signal to be transmitted includes only the first part
- the preamble signal to be transmitted includes the second portion.
- the second part is composed of one OFDM symbol, and the OFDM symbol is composed of a cyclic prefix CP and two periodic sequences.
- the preamble signal to be transmitted is determined, including:
- the preamble signal to be transmitted only includes the first part
- the preamble signal to be transmitted includes the second portion.
- the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix (CP), or two OFDM symbols
- CP cyclic prefix
- a second CP is shared, and the length of the first CP is half of the length of the second CP.
- the second part of the preamble signal is included
- the division consists of one OFDM symbol consisting of one cyclic prefix and two periodic sequences
- the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number
- the periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
- the sequence in the first portion is generated based on a sequence in the second portion
- the sequence in the third portion is generated based on a sequence in the second portion.
- a method for receiving a preamble signal includes:
- the UE performs initial synchronization using the discovery signal
- the UE When determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is a full bandwidth of the base station accessing the channel on the unlicensed spectrum. Or sent on part of the bandwidth.
- the UE performs initial synchronization using the discovery signal, and when determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization using the detected preamble signal, wherein the preamble signal is the base station. Transmitting on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so that on the UE side, even if the signal reception is found to be very bad, the preamble signal can be used to implement the synchronization function, and the UE can detect these preamble signals. As to whether the UE detects these preamble signals, whether to use these preamble signals to implement the synchronization function depends on the UE receiving the discovery signal. If the signal reception is found to be good, the preamble signal is a placeholder, and the UE can ignore the direct decoupling control of the preamble signal. Signaling and data are all there.
- the method further comprises:
- the UE determines the data start position using the detected preamble signal.
- the determining that the UE needs to detect the preamble signal comprises: determining, by the UE, that the preamble signal needs to be detected according to the receiving quality of the discovery signal.
- the detecting, by the UE, the preamble signal includes:
- the UE detects the entirety of the second part of the preamble signal in the received signal by using the locally stored or immediately generated preamble sequence, or detects the first OFDM symbol of the second part of the preamble signal, or the preamble signal The second OFDM symbol of the second part is detected;
- the UE abandons the detection of the preamble signal
- the UE performs detection of the third portion of the preamble signal.
- a preamble signal determining unit configured to determine a preamble signal to be transmitted when the base station randomly accesses the channel on the unlicensed spectrum
- a sending unit configured to send the preamble signal to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
- the device determines the preamble signal to be sent, and sends the preamble signal to the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
- the UE thereby implementing the occupancy of the LTE system on the unlicensed spectrum by using the preamble signal, specifically, the time for the LTE-U base station to access the channel is random, or the access time is the starting position of the subframe, but the base station It is not ready to send data. At this time, the placeholder must be sent.
- the LTE-U base station uses the preamble signal to occupy the bit, so that the preamble signal can assist the discovery signal to realize the synchronization of the UE. In turn, the LTE system can work on the unlicensed spectrum.
- the start time of the preamble signal is the time of the base station random access channel
- the termination time of the preamble signal is before the data symbol and the transmission time of the control signaling.
- the preamble signal is a preamble signal including at least one of the first part, the second part and the third part, wherein the length of the first part is a non-integer number of OFDM symbols, the second part and the third part The length of the part is an integer multiple of the length of the OFDM symbol.
- the preamble signal determining unit determines the preamble signal to be transmitted, it is specifically used to:
- determining that the preamble signal to be transmitted includes only the first part
- the preamble signal to be transmitted includes the second portion.
- the second part is composed of one OFDM symbol, and the OFDM symbol is composed of a cyclic prefix CP and two periodic sequences.
- the preamble signal determining unit determines the preamble signal to be transmitted, it is specifically used to:
- the preamble signal to be transmitted only includes the first part
- the preamble signal to be transmitted includes the second portion.
- the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix CP, or two OFDM symbols share one
- the second CP the length of the first CP is half of the length of the second CP.
- the second part of the preamble signal is composed of one OFDM symbol, and the OFDM symbol is composed of one cyclic prefix and two periodic sequences;
- the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number
- the periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
- the sequence in the first portion is generated based on a sequence in the second portion
- the sequence in the third portion is generated based on a sequence in the second portion.
- An auxiliary synchronization unit configured to detect the preamble signal and perform auxiliary synchronization by using the detected preamble signal when determining that the preamble signal needs to be detected, wherein the preamble signal is that the base station accesses the channel on the unlicensed spectrum Transmitted on full bandwidth or part of the bandwidth.
- the initial synchronization is performed by using the discovery signal, and when determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is
- the base station sends the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so that the UE can detect the preamble signal by using the preamble signal even if the signal reception is very bad.
- the preamble signal whether the UE is to detect these preamble signals, whether to use these preamble signals to achieve synchronization function depends on the UE receiving the discovery signal. If the signal reception is found to be good, the preamble signal is a placeholder, and the UE can ignore the preamble signal directly. It is enough to solve the control signaling and data.
- the auxiliary synchronization unit is further configured to: determine a data start position by using the detected preamble signal.
- the auxiliary synchronization unit determines that the preamble signal needs to be detected, it is specifically used to: determine that the preamble signal needs to be detected according to the reception quality of the discovery signal.
- the auxiliary synchronization unit detects the preamble signal, it is specifically used to:
- the detection of the third portion of the preamble is performed.
- another apparatus for transmitting a preamble signal includes:
- a processor for reading a program in the memory performing the following process:
- the preamble signal is sent by the transceiver 510 to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
- the preamble signal to be transmitted is determined, and the preamble signal is used on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
- the LTE system is occupied by the preamble signal on the unlicensed spectrum.
- the time for the LTE-U base station to access the channel is random, or the access time is the start of the subframe. Location, but the base station is not ready to send data. At this time, the placeholder must be sent.
- the LTE-U base station is occupied by the preamble signal, so that the preamble signal can assist the discovery signal to realize the synchronization of the UE. In turn, the LTE system can work on the unlicensed spectrum.
- the start time of the preamble signal is the time when the base station randomly accesses the channel, and the preamble signal The termination time is before the transmission time of the data symbols and control signaling.
- the preamble signal is a preamble signal including at least one of the first part, the second part and the third part, wherein the length of the first part is a non-integer number of OFDM symbols, the second part and the third part The length of the part is an integer multiple of the length of the OFDM symbol.
- the processor determines the preamble signal that needs to be sent, it is specifically used to:
- determining that the preamble signal to be transmitted includes only the first part
- the preamble signal to be transmitted includes the second portion.
- the second part is composed of one OFDM symbol, and the OFDM symbol is composed of a cyclic prefix CP and two periodic sequences.
- the processor determines the preamble to be transmitted, it is specifically used to:
- the preamble signal to be transmitted only includes the first part
- the preamble signal to be transmitted includes the second portion.
- the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix CP, or two OFDM symbols share one
- the second CP the length of the first CP is half of the length of the second CP.
- the second part of the preamble signal is composed of one OFDM symbol, and the OFDM symbol is composed of one cyclic prefix and two periodic sequences;
- the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number
- the periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
- the sequence in the first portion is generated based on a sequence in the second portion
- the sequence in the third portion is generated based on a sequence in the second portion.
- a transceiver for receiving and transmitting related information data under the control of a processor.
- the apparatus further includes a bus architecture, which may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by the processor and various circuits of the memory represented by the memory.
- the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
- the bus interface provides an interface.
- the transceiver can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
- the processor is responsible for managing the bus architecture and the usual processing, and the memory can store the data that the processor uses when performing operations.
- a receiving device for a preamble signal provided by the embodiment of the present application includes:
- a processor for reading a program in the memory performing the following process:
- the preamble signal received by the transceiver 610 is detected and assisted synchronization is performed by using the detected preamble signal, wherein the preamble signal is the base station accessing the unlicensed spectrum. Transmitted on the full bandwidth or part of the bandwidth of the channel.
- the initial synchronization is performed by using the discovery signal, and when determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is
- the base station sends the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so that the UE can detect the preamble signal by using the preamble signal even if the signal reception is very bad.
- the preamble signal whether the UE is to detect these preamble signals, whether to use these preamble signals to achieve synchronization function depends on the UE receiving the discovery signal. If the signal reception is found to be good, the preamble signal is a placeholder, and the UE can ignore the preamble signal directly. It is enough to solve the control signaling and data.
- the processor is further configured to: determine the starting position of the data by using the detected preamble signal.
- the processor determines that the preamble signal needs to be detected, it is specifically configured to: determine, according to the receiving quality of the discovery signal, that the preamble signal needs to be detected.
- the processor detects the preamble signal, it is specifically used to:
- the detection of the third portion of the preamble is performed.
- Each of the above units can be implemented by a physical device such as a processor.
- a transceiver for receiving and transmitting related information data under the control of a processor.
- the device further comprises a bus architecture and a user interface
- the bus architecture may comprise any number of interconnected buses and bridges, in particular the various circuits of the memory represented by one or more processors and memories represented by the processor are together.
- the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
- the bus interface provides an interface.
- the transceiver can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
- the user interface may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
- the processor is responsible for managing the bus architecture and the usual processing, and the memory can store the data that the processor uses when performing operations.
- FIG. 1 is a schematic diagram of a first type of frame structure used in an FDD system in the prior art
- FIG. 2 is a schematic diagram of a second type of frame structure used in a TDD system in the prior art
- FIG. 3 is a schematic structural diagram of a preamble according to an embodiment of the present disclosure.
- FIG. 4 is a schematic structural diagram of another preamble signal according to an embodiment of the present application.
- FIG. 5 is a schematic flowchart of a method for sending a preamble according to an embodiment of the present disclosure
- FIG. 6 is a schematic flowchart of a method for receiving a preamble according to an embodiment of the present disclosure
- FIG. 7 is a schematic structural diagram of a device for transmitting a preamble according to an embodiment of the present disclosure.
- FIG. 8 is a schematic structural diagram of a receiving device for a preamble according to an embodiment of the present disclosure.
- FIG. 9 is a schematic structural diagram of another apparatus for transmitting a preamble according to an embodiment of the present disclosure.
- FIG. 10 is a schematic structural diagram of another apparatus for receiving a preamble according to an embodiment of the present disclosure.
- the embodiment of the present application provides a method and a device for transmitting a preamble signal, which are used to implement a vacancy in an unlicensed spectrum of an LTE system by using a preamble signal, thereby implementing an LTE system working on an unlicensed spectrum.
- the embodiment of the present application provides a new design of the placeholder symbol, that is, the occupancy function is realized by using the newly designed preamble signal, so that the function of the placeholder can be completed and realized. It assists in the discovery of signal synchronization and other functions to solve the problem of network access and cell synchronization encountered by the LTE system on the unlicensed spectrum.
- the embodiment of the present application proposes that when a channel is randomly accessed on an unlicensed spectrum, a preamble signal to be transmitted is determined, and a starting point and a length of the preamble signal are adaptively variable, that is, a length and a position of the preamble signal are not preset.
- the base station transmits the determined preamble signal to the UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum. Therefore, the base station not only implements the LTE-U base station signal occupation by the preamble signal, but also has the functions of assisting the UE synchronization and the like.
- the complete preamble signal structure provided in the embodiment of the present application is composed of three parts, and the lengths of the first part (preamble I) and the third part (preamble III) are variable, not fixed length, and the length of the second part (preamble II) It is relatively fixed, and the length of the first part is a non-integer Orthogonal Frequency Division Multiplex (OFDM) symbol length, and the lengths of the second part and the third part are integer multiples of the OFDM symbol.
- OFDM Orthogonal Frequency Division Multiplex
- the preamble signal actually transmitted may include only some of the above three parts, and may also include all three parts.
- Embodiment 1 The time domain structure of the three parts included in the preamble signal that needs to be sent to the UE determined by the base station is as shown in FIG. 3, and the following principles are met:
- Preamble II if present, consists of an OFDM symbol from the time domain, the OFDM symbol being prefixed by a cyclic prefix (CP) consists of two periodic sequences C.
- the periodic sequence C can be generated by a Pseudo-Noise Sequence (PN) sequence or a zadoff-chu sequence or other sequences having very good correlation properties.
- PN Pseudo-Noise Sequence
- the preamble I is represented by the sequence A, and its length is variable, and the number of samples is
- which may be any sequence or part of the preamble II.
- the preamble II sequence is taken according to the length of the preamble I
- of [CP C C] is used as the preamble I. If
- 0, the preamble I part does not exist.
- the preamble III is represented by the sequence D. If it exists, its length must be an integer number of OFDM symbols.
- is determined by the base station, and the repetition can be determined according to the length. The number of OFDM symbols, if
- 0, the preamble III part does not exist.
- the preferred preamble I and preamble III are both generated by the preamble II, and their lengths are adaptively changed.
- the preamble II can be configured
- Preamble I and preamble III can be configured or not configured when the preamble II is configured.
- the length of the preamble I is variable, but the length of time must be less than two OFDM symbols;
- the preamble III if present, must be an integer multiple of the OFDM symbol.
- the UE can recognize the end time of the preamble signal, and can complete the occupancy function of the contention access and enable the UE to complete the synchronization process of time and frequency.
- M is a positive integer and is less than or equal to 14
- N is a positive integer, and its size Corresponding to the sampling rate.
- the base station access time is located at the beginning of a certain subframe. If the base station is ready to send data at this time, the placeholder is not sent, and the preamble I, preamble II, and preamble III are set.
- the length is 0;
- the base station random access time is not the starting position of an OFDM symbol in the subframe, and the access time to the next complete subframe initial position includes at least two complete OFDM symbols.
- the base station may send the preamble I on the Nth sample of the Mth OFDM symbol to the last sample of the OFDM symbol, and transmit the preamble II on the M+1th OFDM symbol, in the access subframe
- the preamble III is transmitted from M+1 to the 14th OFDM.
- the UE may first detect the preamble II, for example, correlation detection.
- the position of the preamble II is relatively accurate, and then the period characteristic of the preamble II can be used to perform the fractional multiple. Frequency offset estimation, with precise symbol timing. Since preamble III can also be used at this time, the repetitive characteristics of preamble II and preamble III can be used to obtain a more accurate fine synchronization estimation than using only preamble II.
- the base station Can be in the Mth
- the Nth sample of the OFDM symbol transmits preamble I to the last sample of the OFDM symbol, the preamble II is transmitted on the 14th OFDM symbol, and the length of the preamble III is configured to be 0.
- the preamble II assisted discovery signal can be used to achieve fine synchronization of the UE.
- the base station can be at the Nth sample of the 14th OFDM symbol to the last sample of the OFDM symbol.
- the preamble II and the preamble III assist in the discovery of the signal for fine synchronization while acting as a placeholder, which can overcome the shortcomings of the use of the discovery signal in the second case, and the base station cannot judge the discovery even if the signal is well received. Whether the signal is well received, the base station can transmit the preamble II and the preamble III, and the UE decides whether to use it for enhanced fine synchronization estimation.
- the preamble signal can function as a placeholder, preferably, the preamble signal occupies the entire transmission bandwidth, but can also occupy only part of the bandwidth, that is, the base station accesses the full bandwidth or part of the bandwidth of the channel on the unlicensed spectrum. And transmitting the determined preamble signal to the UE.
- the preamble signal is still composed of three parts, but unlike the above scheme 1, the preamble II occupying one OFDM symbol in scheme one is replaced by the preamble II occupying two OFDM symbols.
- the preamble II form of two OFDM symbols is [CP1 C1 CP1 C1] or [CP2 C1 C1].
- the former adopts the traditional cyclic prefix, that is, the first cyclic prefix CP1, [CP1 C1] constitutes one OFDM symbol, and the latter two OFDM symbols share one cyclic prefix, that is, the second cyclic prefix CP2, wherein the length of CP1 is half of the length of CP2.
- Preamble I if present, is represented by sequence A, the number of samples is
- 0, the preamble I part does not exist.
- the preamble III is represented by the sequence D. If it exists, its length must be an integer number of OFDM symbols. Preferably, the repetition of the preamble II sequence [CP1 C1], the length
- 0, the preamble III part does not exist.
- the preamble II can be configured
- Preamble I and preamble III can be configured or not configured when the preamble II is configured.
- the length of the preamble I is variable, but the time must be less than two OFDM symbols;
- preamble III its length must be an integer multiple of the OFDM symbol.
- N>1 that is, the access time is not the starting position of an OFDM symbol in the subframe, and the access time to the next complete subframe initial position includes two complete OFDM symbols, and the base station can be in the 12th OFDM symbol.
- the Nth sample transmits a preamble I to the last sample of the OFDM symbol, the preamble II is transmitted on the 13th and 14th OFDM symbols, and the length of the preamble III is configured to be 0.
- the preamble signal can function as a placeholder, preferably, the preamble signal occupies the entire transmission bandwidth, but can also occupy only part of the bandwidth, that is, the base station accesses the full bandwidth or part of the bandwidth of the channel on the unlicensed spectrum. And transmitting the determined preamble signal to the UE.
- Embodiment 3 The time domain structure of the three parts included in the preamble signal that needs to be sent to the UE determined by the base station is as shown in FIG. 4, and the following principles are met:
- Preamble II if present, consists of two OFDM symbols from the time domain, the first OFDM symbol consisting of a first cyclic prefix CP1 and a preset number T (T is greater than or equal to 1) time domain periodic sequence B;
- the OFDM symbols are composed of a second cyclic prefix CP2 and two periodic sequences C, both of which can be generated by a frequency domain PN sequence or a zadoff-chu sequence or other sequences having very good correlation properties.
- the base station needs to determine the number T of periodic sequences B in advance.
- the maximum frequency offset is 116K.
- the preamble I is represented by the sequence A, and its length is variable.
- which may be any sequence, or may be part of the preamble II.
- which may be any sequence, or may be part of the preamble II.
- the length of the preamble I
- samples of the second OFDM symbol sequence [CP2 C C] are used as preamble I, and if
- 0, the preamble I portion does not exist.
- the preamble III is represented by the sequence D. If it exists, its length must be an integer number of OFDM symbols. Preferably, it may be a repetition of the second OFDM symbol sequence [CP2 C C] of the preamble II, and the length
- 0, the preamble III portion does not exist.
- the second OFDM symbol [CP2 C C] of the preamble II may be configured;
- the complete preamble II can be configured
- Preamble I and preamble III can be configured or not configured when the preamble II is configured.
- the preamble I has a variable length and is not fixed, but the length of time is necessarily less than one OFDM symbol;
- the preamble III if present, must be an integer multiple of the OFDM symbol time.
- M is a positive integer and is less than or equal to 14
- N is a positive integer. Rate related.
- the base station random access time is located at the beginning of a subframe. If the base station is ready to send data at this time, there is no need to send a placeholder, and preamble I and preamble II can be set.
- the length of the preamble III is 0;
- the base station random access time is not the starting position of an OFDM symbol in the subframe, and the access time to the next complete subframe initial position includes at least two complete OFDM symbols
- the base station The preamble I may be transmitted on the Nth sample of the Mth OFDM symbol to the last sample of the OFDM symbol
- the preamble II may be transmitted on the M+1th and M+2th OFDM symbols.
- the UE may first detect the periodic sequence B in the first OFDM symbol of the preamble II, obtain the coarse time and frequency synchronization by using the sequence B, and then obtain the small periodic sequence C of the second OFDM symbol of the preamble II to obtain a small Several times the frequency offset estimation, with precise symbol timing.
- the base station may send the preamble I on the Nth sample of the Mth OFDM symbol to the last sample of the OFDM symbol.
- the preamble II is transmitted on the M+1 and the M+2 OFDM symbols, and the preamble III is transmitted in the M+3 to the last available OFDM symbol.
- the sequence B is used to obtain the coarse time and frequency synchronization. Since the preamble III exists at this time, the preamble III can be used as the second OFDM symbol repetition feature of the preamble II, and the preamble II and the preamble III are combined to obtain only the preamble II. More accurate fine synchronization estimation. Since the coarse synchronization can be realized by the periodic sequence B, it is possible to overcome the scenario in which the above-mentioned situation 3 finds that the signal is invalid.
- the base station first transmits the preamble I on the Nth sample of the 13th OFDM symbol to the last sample of the OFDM symbol. And then transmitting the second OFDM symbol [CP2 C C] of the preamble II on the 14th OFDM symbol, and then degenerates to the special case of the first scheme, and the OFDM symbol can be used to obtain the fractional multiple offset estimation and the exact symbol. Timing, overcomes the shortcomings of the previously found discovery signal in the case of two-in-one synchronization inaccuracy.
- the base station can configure the preamble signal of the structure shown in FIG. 4, and the UE can decide whether to use the preamble signal to implement coarse synchronization and fine synchronization. Since the preamble signal provided by the embodiment of the present application is capable of occupying a placeholder function, a preferred preamble signal occupies the entire transmission bandwidth, but may also occupy only part of the bandwidth, that is, the base station accesses the channel on the unlicensed spectrum. The determined preamble signal is sent to the UE on the bandwidth or part of the bandwidth.
- the OFDM number from the time when the base station randomly accesses the channel to the next complete subframe is used to transmit the preamble as a placeholder, in fact, the part of the subframe in which the base station randomly accesses the channel.
- the OFDM symbol if it can be used for transmitting data, the solution of the embodiment of the present application is also applicable, and the base station configures the last OFDM symbol of the preamble signal.
- the OFDM symbol is before the data OFDM symbol or with the first data OFDM symbol. coincide.
- the preamble signal can also realize the auxiliary discovery signal synchronization while indicating the start position of the data symbol while completing the placeholder function.
- a method for transmitting a preamble signal includes:
- the base station sends the preamble signal to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
- the base station determines a preamble signal to be transmitted, and the base station accesses the full bandwidth or part of the bandwidth of the channel on the unlicensed spectrum, and the preamble signal is used.
- the LTE system is occupied by the preamble signal on the unlicensed spectrum.
- the time for the LTE-U base station to access the channel is random, or the access time is the start of the subframe. Location, but the base station is not ready to send data. At this time, the placeholder must be sent.
- the LTE-U base station is occupied by the preamble signal provided in the method, so that the preamble signal can assist the discovery signal to implement the synchronization of the UE and the like. In turn, the LTE system can work on the unlicensed spectrum.
- the start time of the preamble signal is the time of the base station random access channel
- the termination time of the preamble signal is before the data symbol and the transmission time of the control signaling.
- the preamble signal is a preamble signal including at least one of the first part, the second part, and the third part, wherein the length of the first part is a non-integer number of orthogonal frequency division multiplexing OFDM symbol lengths, The length of time of the second part and the third part is an integer multiple of the length of the OFDM symbol.
- the preamble signal to be transmitted is determined, including:
- determining that the preamble signal to be transmitted includes only the first part
- the preamble signal to be transmitted includes the second portion.
- the second part is composed of one OFDM symbol, and the OFDM symbol is composed of a cyclic prefix CP and two periodic sequences.
- the preamble signal to be transmitted is determined, including:
- the preamble signal to be transmitted only includes the first part
- the preamble signal to be transmitted includes the second portion.
- the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix CP, or two OFDM symbols share one
- the second CP the length of the first CP is half of the length of the second CP.
- the second part of the preamble signal is composed of one OFDM symbol, and the OFDM symbol is composed of one cyclic prefix and two periodic sequences;
- the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number
- the periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
- the sequence in the first portion is generated based on a sequence in the second portion
- the sequence in the third portion is generated based on a sequence in the second portion.
- a method for receiving a preamble signal includes:
- the user equipment UE performs initial synchronization by using a discovery signal.
- the UE When determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is that the base station accesses a channel on an unlicensed spectrum. Transmitted on full bandwidth or part of the bandwidth.
- the UE performs initial synchronization using the discovery signal, and when determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization using the detected preamble signal, wherein the preamble signal is the base station. Transmitting on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so that on the UE side, even if the signal reception is found to be very bad, the preamble signal can be used to implement the synchronization function, and the UE can detect these preamble signals. As to whether the UE detects these preamble signals, whether to use these preamble signals to implement the synchronization function depends on the UE receiving the discovery signal. If the signal reception is found to be good, the preamble signal is a placeholder, and the UE can ignore the direct decoupling control of the preamble signal. Signaling and data are all there.
- the method further comprises:
- the UE determines the data start position using the detected preamble signal.
- the determining that the UE needs to detect the preamble signal comprises: determining, by the UE, that the preamble signal needs to be detected according to the receiving quality of the discovery signal.
- the detecting, by the UE, the preamble signal includes:
- the UE detects the entirety of the second part of the preamble signal in the received signal by using the locally stored or immediately generated preamble sequence, or detects the first OFDM symbol of the second part of the preamble signal, or the preamble signal The second OFDM symbol of the second part is detected;
- the UE abandons the detection of the preamble signal
- the UE performs detection of the third portion of the preamble signal.
- a method for receiving a preamble signal includes:
- Step 1 The UE uses the discovery signal to perform initial synchronization estimation
- Step 2 The UE determines whether to detect the preamble signal according to the reception quality of the discovery signal; for example, if the reception quality of the signal is found to be good (the specific judgment standard can be set according to actual needs), accurate synchronization can be realized without further detecting the preamble signal. Then, the preamble signal is not detected, and only the preamble signal is used as a placeholder. If the reception quality of the signal is found to be poor, it is determined that the preamble signal needs to be detected.
- Step 3 When it is determined that the preamble signal needs to be detected, the UE starts to detect the preamble signal. First, the UE detects the OFDM symbol of the preamble II or the preamble II in the received signal by using the preamble sequence generated by the UE locally or generated in real time. In the first scheme, the entire preamble II is detected. If the second scheme is used, the first OFDM symbol of the preamble II is detected. If the third scheme is used, the second OFDM symbol of the preamble II is detected. Can be related detection.
- the detection of the preamble II is completed according to the actual situation of various schemes. If the preamble II is not detected, it means that there is at most preamble I, and the time-frequency synchronization needs to be completed according to the synchronization method of the discovery signal.
- Step 4 After the UE completes the preamble II test, it needs to detect whether the preamble III exists according to the preamble III structure according to the actual preamble scheme (the first scheme, the second scheme or the third scheme); the front part of the preamble II is the preamble I.
- the preamble I is used for the placeholder, and the UE does not need to identify it.
- Step 5 After detecting the preamble signal, the UE determines whether to use the preamble signal for auxiliary synchronization according to the structure of the preamble signal and the quality of the UE discovery signal reception. If auxiliary synchronization is needed, the preamble signal is used for auxiliary synchronization.
- Step 6 After the UE detects the preamble signal, when the data transmission is an incomplete subframe, the preamble signal is used to determine the starting OFDM symbol position of the data transmission.
- a transmitting device for transmitting a preamble includes:
- the preamble signal determining unit 11 is configured to determine, when the base station randomly accesses the channel on the unlicensed spectrum, the preamble signal that needs to be sent;
- the sending unit 12 is configured to send the preamble signal to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
- the preamble signal to be transmitted is determined, Transmitting the preamble signal to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so as to implement the LTE system occupying the unlicensed spectrum by using the preamble signal, specifically, LTE-
- the time at which the U base station accesses the channel is random, or the access time is the start position of the subframe, but the base station is not ready to transmit data, and the placeholder must be sent at this time, and the LTE-U base station uses the preamble signal to The placeholder enables the preamble signal to assist the discovery signal to implement functions such as synchronization of the UE.
- the LTE system can work on the unlicensed spectrum.
- the start time of the preamble signal is the time of the base station random access channel
- the termination time of the preamble signal is before the data symbol and the transmission time of the control signaling.
- the preamble signal is a preamble signal including at least one of the first part, the second part, and the third part, wherein the length of the first part is a non-integer number of orthogonal frequency division multiplexing OFDM symbol lengths, The length of time of the second part and the third part is an integer multiple of the length of the OFDM symbol.
- the preamble signal determining unit determines the preamble signal to be transmitted, it is specifically used to:
- determining that the preamble signal to be transmitted includes only the first part
- the preamble signal to be transmitted includes the second portion.
- the second part is composed of one OFDM symbol, and the OFDM symbol is composed of a cyclic prefix CP and two periodic sequences.
- the preamble signal determining unit determines the preamble signal to be transmitted, it is specifically used to:
- the preamble signal to be transmitted only includes the first part
- the preamble signal to be transmitted includes the second portion.
- the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix CP, or two OFDM symbols share one
- the second CP the length of the first CP is half of the length of the second CP.
- the second part of the preamble signal is composed of one OFDM symbol, and the OFDM symbol is composed of one cyclic prefix and two periodic sequences;
- the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number
- the periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
- the sequence in the first portion is generated based on a sequence in the second portion
- the sequence in the third portion is generated based on a sequence in the second portion.
- the transmitting device of the foregoing preamble signal may be a base station.
- a receiving device for a preamble signal includes:
- the auxiliary synchronization unit 22 is configured to: when determining that the preamble signal needs to be detected, detect the preamble signal and perform auxiliary synchronization by using the detected preamble signal, where the preamble signal is the base station accessing the unlicensed spectrum Transmitted on the full bandwidth or part of the bandwidth of the channel.
- the initial synchronization is performed by using the discovery signal, and when determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is
- the base station sends the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so that the UE can detect the preamble signal by using the preamble signal even if the signal reception is very bad.
- the preamble signal whether the UE is to detect these preamble signals, whether to use these preamble signals to achieve synchronization function depends on the UE receiving the discovery signal. If the signal reception is found to be good, the preamble signal is a placeholder, and the UE can ignore the preamble signal directly. It is enough to solve the control signaling and data.
- the auxiliary synchronization unit is further configured to: determine a data start position by using the detected preamble signal.
- the auxiliary synchronization unit determines that the preamble signal needs to be detected, it is specifically used to: determine that the preamble signal needs to be detected according to the reception quality of the discovery signal.
- the auxiliary synchronization unit detects the preamble signal, it is specifically used to:
- the detection of the third portion of the preamble is performed.
- Each of the above units can be implemented by a physical device such as a processor.
- the receiving device of the foregoing preamble signal may be a UE.
- a sending device for a preamble signal (the device may be a base station) provided by the embodiment of the present application includes:
- the processor 500 is configured to read a program in the memory 520 and perform the following process:
- the preamble signal is sent by the transceiver 510 to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
- the preamble signal to be transmitted is determined, and the preamble signal is used on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
- the LTE system is occupied by the preamble signal on the unlicensed spectrum.
- the time for the LTE-U base station to access the channel is random, or the access time is the start of the subframe. Location, but the base station is not ready to send data. At this time, the placeholder must be sent.
- the LTE-U base station is occupied by the preamble signal, so that the preamble signal can assist the discovery signal to realize the synchronization of the UE. In turn, the LTE system can work on the unlicensed spectrum.
- the start time of the preamble signal is the time of the base station random access channel
- the termination time of the preamble signal is before the data symbol and the transmission time of the control signaling.
- the preamble signal is a preamble signal including at least one of the first part, the second part, and the third part, wherein the length of the first part is a non-integer number of orthogonal frequency division multiplexing OFDM symbol lengths, The length of time of the second part and the third part is an integer multiple of the length of the OFDM symbol.
- the processor 500 determines the preamble signal that needs to be sent, it is specifically used to:
- determining that the preamble signal to be transmitted includes only the first part
- the preamble signal to be transmitted includes the second portion.
- the second part is composed of one OFDM symbol, and the OFDM symbol is composed of a cyclic prefix CP and two periodic sequences.
- the processor 500 determines the preamble signal that needs to be transmitted, it is specifically used to:
- the preamble signal to be transmitted only includes the first part
- the preamble signal to be transmitted includes the second portion.
- the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix CP, or two OFDM symbols share one
- the second CP the length of the first CP is half of the length of the second CP.
- the second part of the preamble signal is composed of one OFDM symbol, and the OFDM symbol is composed of one cyclic prefix and two periodic sequences;
- the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number
- the periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
- the sequence in the first portion is generated based on a sequence in the second portion
- the sequence in the third portion is generated based on a sequence in the second portion.
- the transceiver 510 is configured to receive and transmit related information data under the control of the processor 500.
- the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 500 and various circuits of memory represented by memory 520.
- the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
- the bus interface provides an interface.
- Transceiver 510 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
- the processor 500 is responsible for managing the bus architecture and the usual processing, and the memory 520 can store the processor 500 for execution. The data used during the operation.
- a receiving device (which may be a UE) of the preamble signal provided by the embodiment of the present application includes:
- the processor 600 is configured to read a program in the memory 620 and perform the following process:
- Initial synchronization is performed using the discovery signal received through the transceiver 610;
- the preamble signal received by the transceiver 610 is detected and assisted synchronization is performed by using the detected preamble signal, wherein the preamble signal is the base station accessing the unlicensed spectrum. Transmitted on the full bandwidth or part of the bandwidth of the channel.
- the initial synchronization is performed by using the discovery signal, and when determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is
- the base station sends the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so that the UE can detect the preamble signal by using the preamble signal even if the signal reception is very bad.
- the preamble signal whether the UE is to detect these preamble signals, whether to use these preamble signals to achieve synchronization function depends on the UE receiving the discovery signal. If the signal reception is found to be good, the preamble signal is a placeholder, and the UE can ignore the preamble signal directly. It is enough to solve the control signaling and data.
- the processor 600 is further configured to: determine a data start position by using the detected preamble signal.
- the processor 600 determines that the preamble signal needs to be detected, it is specifically used to: determine that the preamble signal needs to be detected according to the reception quality of the discovery signal.
- the processor 600 detects the preamble signal, it is specifically used to:
- the detection of the third portion of the preamble is performed.
- Each of the above units can be implemented by a physical device such as a processor.
- the transceiver 610 is configured to receive and transmit related information data under the control of the processor 600.
- the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 600 and various circuits of memory represented by memory 620.
- the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
- the bus interface provides an interface.
- Transceiver 610 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
- the user interface 630 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
- the processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 can store data used by the processor 600 in performing operations.
- the time for the LTE-U base station to access the channel is random, or the access time is the starting position of the subframe, but the base station is not ready to send data, and
- the placeholder is sent.
- the embodiment of the present application implements the placeholder by appropriately designing the preamble signal, so that it can assist the discovery signal to achieve synchronization and the like.
- the feature of the placeholder signal is divided into two parts, one part is a non-integer number of OFDM symbols, and the other part is an integer number of OFDM symbols, and the ending position depends on the configuration of the base station. If the incomplete subframe does not transmit data, the placeholder end position Before the next subframe, if the data is transmitted in an incomplete subframe, the end position of the place signal is an OFDM symbol of the subframe in which the access time configured by the base station is located.
- the placeholder signal can be of any structure. Since the placeholder is necessary, the structure of the placeholder can be properly designed so that the preamble signal and the transmission schemes one, two, and three have the function of assisting synchronization, and play in the first scheme.
- the end point of the synchronization action is the preamble II of one OFDM symbol.
- the preamble I only has a placeholder function, and there is no other use.
- the preamble III needs to count the number of OFDM symbols occupied by the actual needs, and the base station determines whether there are any symbols or not. It is detected that if the preamble III is also present, the preamble II combined with the preamble III can make the synchronization estimation more accurate.
- the second scheme is the same as the scheme one, except that the preamble II in scheme 1 is replaced by two OFDM symbols, because it is also possible to switch to two OFDM symbols, and better synchronization estimation accuracy can be obtained, but the preamble II needs at least two.
- the overhead is large; the focus of the third scheme is that the preamble II's previous symbol can achieve coarse synchronization, the latter symbol can achieve fine synchronization, but its structure is very flexible, when the number of symbols required by the placeholder is small, Fine synchronization can be implemented only by configuring its second OFDM symbol.
- coarse synchronization can be implemented by the first symbol of preamble II. In this case, the discovery signal is replaced even if signal reception is found.
- the UE can detect these preamble signals, as to whether the UE is to detect, whether to use it to achieve synchronization function depends on the UE receiving the discovery signal, if the signal is found to be good, the preamble signal It is a placeholder, and the UE is designed according to the LTE-U scheme. It ignores the direct control of the signaling and data for the preamble. To the.
- the embodiment of the present application proposes a novel transmission method and device for a preamble signal, which can assist in synchronization while the preamble signal plays a role of occupying a bit, and assists in identifying the starting position of data transmission, but the prior art has not yet given The specific implementation of the bit.
- embodiments of the present application can be provided as a method, system, or computer program product.
- the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
- the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
- the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
- These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
- the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
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Abstract
Disclosed are a method and device for transmitting a preamble signal, so as to implement occupation of an LTE system in an unlicensed spectrum through a preamble signal and accordingly enable the LTE system to work in the unlicensed spectrum. The method for sending a preamble signal provided by the present application comprises: when random channel access is implemented in an unlicensed spectrum, a base station determines a preamble signal to be sent; and in the full bandwidth or partial bandwidth of an access channel in the unlicensed spectrum, the base station sends the preamble signal to a user equipment (UE).
Description
本申请要求在2014年11月4日提交中国专利局、申请号为201410613675.3、发明名称为“一种前导信号的传输方法及设备”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。The present application claims priority to Chinese Patent Application No. 201410613675.3, entitled "Transmission Method and Apparatus for a Preamble Signal", filed on November 4, 2014, the entire contents of which is incorporated herein by reference. In the application.
本申请涉及通信技术领域,尤其涉及一种前导信号的传输方法及设备。The present application relates to the field of communications technologies, and in particular, to a method and a device for transmitting a preamble signal.
随着移动数据业务量的不断增长,频谱资源越来越紧张,仅使用授权频谱资源进行网络部署和业务传输可能已经不能满足业务量需求,因此长期演进(Long Term Evolution,LTE)系统可以考虑在非授权频谱资源上部署传输,可以称这种LTE系统为非授权LTE(Unlicensed LTE,简称为U-LTE或者LTE-U)系统,以提高用户体验和扩展覆盖。但是,目前LTE系统如何在非授权频谱资源上工作还没有明确的方案。As the volume of mobile data continues to grow, spectrum resources become more and more tense. Only the use of licensed spectrum resources for network deployment and service transmission may not meet the traffic demand. Therefore, the Long Term Evolution (LTE) system can be considered. The LTE system is an unlicensed LTE (Unlicensed LTE, U-LTE or LTE-U) system to improve user experience and extended coverage. However, there is currently no clear solution on how LTE systems work on unlicensed spectrum resources.
非授权频谱没有规划具体的应用系统,可以为多种无线通信系统如蓝牙、WiFi等共享,多种系统间通过抢占资源的方式使用共享的非授权频谱资源。故不同运营商部署的LTE-U之间及LTE-U与WiFi等无线通信系统的共存性是研究的一个重点与难点。3GPP要求保证LTE-U与WiFi等无线通信系统的公平共存,非授权频段作为辅载波由授权频段的主载波辅助实现。通话前监听(listen Before Talk,LBT)作为LTE-U竞争接入的基本手段,得到几乎所有公司的赞同。LBT技术的本质仍然是802.11系统采用载波监听/冲突避免(CSMA/CA)机制,WiFi系统在非授权频谱上的抢占资源方式包括:首先,对信道进行监听,当信道空闲时间达到DCF帧间距离(DCF Inter-Frame Space,DIFS;DCF,distributed channel access,分布式信道接入),便判断当前信道为空闲信道,然后各个等待接入的信道的站点,便进入一个随机回退阶段,用于避免多个站点在相同的资源发生碰撞。此外,为了保证公平性,还规定每个站点不能长期占用频谱资源,到达一定时间或数据传输量上限时,需要释放资源,以供其他WiFi或LTE系统抢占资源。The unlicensed spectrum does not have a specific application system, and can be shared by various wireless communication systems such as Bluetooth, WiFi, etc., and the shared unlicensed spectrum resources are used by multiple systems by preempting resources. Therefore, the coexistence of LTE-U deployed by different operators and wireless communication systems such as LTE-U and WiFi is a key point and difficulty in research. The 3GPP requires that the wireless coexistence of LTE-U and wireless communication systems such as WiFi be guaranteed. The unlicensed frequency band is used as a secondary carrier to be assisted by the primary carrier of the licensed frequency band. Listening before Talk (LBT) is the basic means of LTE-U competitive access, which is approved by almost all companies. The essence of LBT technology is still that the 802.11 system adopts the carrier sense/collision avoidance (CSMA/CA) mechanism. The way in which the WiFi system preempts resources on the unlicensed spectrum includes: first, listening to the channel, when the channel idle time reaches the DCF interframe distance (DCF Inter-Frame Space, DIFS; DCF, distributed channel access, distributed channel access), it is judged that the current channel is an idle channel, and then each station waiting for access to the channel enters a random back-off phase for Avoid multiple sites colliding on the same resources. In addition, in order to ensure fairness, it is also stipulated that each site cannot occupy spectrum resources for a long time. When a certain time or data transmission limit is reached, resources need to be released for other WiFi or LTE systems to seize resources.
LTE系统支持FDD和TDD两种双工方式,两种双工模式使用不同的帧结构。两种帧结构的共同点是每个无线帧由10个1ms子帧组成。FDD系统使用的第一类帧结构如图1所示,TDD系统使用的第二类帧结构,如图2所示。The LTE system supports both FDD and TDD duplex modes, and the two duplex modes use different frame structures. Common to both frame structures is that each radio frame consists of 10 1 ms subframes. The first type of frame structure used by the FDD system is shown in Figure 1, and the second type of frame structure used by the TDD system is shown in Figure 2.
从目前的协议及其工程实现的角度看,既使是FDD的载波聚合,主载波与辅载波在时间上也是同步的,由于LTE-U监听信道且判断为“闲”的时刻是随机的,故LTE-U信
号传输的时间起点可能是某个子帧的任何位置,另一方面即使LTE接入时刻恰好是某个子帧的起点,但是由于数据准备或者射频等因素的影响,基站可能不能及时发送控制信道与数据。从LTE帧结构可看出,其信号传输都是以1ms子帧为单位的,若LTE-U抢到信道后不发信号的话,竞争激烈情况下必然会被其它节点抢去,这样大大降低了LTE-U的竞争接入能力,不太可能被采用。From the perspective of the current protocol and its engineering implementation, even if it is carrier aggregation of FDD, the primary carrier and the secondary carrier are also synchronized in time. Since the time when the LTE-U monitors the channel and judges to be "free" is random, LTE-U letter
The starting time of the number transmission may be any position of a certain subframe. On the other hand, even if the LTE access moment happens to be the starting point of a certain subframe, the base station may not be able to send the control channel and data in time due to factors such as data preparation or radio frequency. . It can be seen from the LTE frame structure that the signal transmission is in units of 1 ms subframes. If the LTE-U does not send a signal after robbing the channel, it will inevitably be snatched by other nodes in the case of fierce competition, which greatly reduces the number of frames. The competitive access capability of LTE-U is unlikely to be adopted.
同时还注意到,以FDD为例,主同步信号(Primary Synchronization Signal,PSS)与辅同步信号(Secondary Synchronization Signal,SSS)序列位于每个无线帧的第一个子帧与第五个子帧上,竞争接入的子帧不是PSS子帧的概率很大,故按照LTE常规方法,该子帧无法实时译码,必然影响其混合自动重传(Hybrid-ARQ,HARQ)进程。或者,该帧是PSS子帧但是接入时刻在PSS之后同样无法完成同步功能。由于同步不及时,导致基站无法收到前面一些子帧的确认(ACK)消息,只能重传,这对于LTE是可以接受的,但对于一次传输时间受限的LTE-U来说,资源浪费严重。At the same time, it is noted that, in the case of FDD, a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) sequence are located in the first subframe and the fifth subframe of each radio frame. The probability that the subframe of the contention access is not a PSS subframe is large. Therefore, according to the conventional method of LTE, the subframe cannot be decoded in real time, which inevitably affects the hybrid automatic retransmission (Hybrid-ARQ, HARQ) process. Alternatively, the frame is a PSS subframe but the access time cannot be synchronized after the PSS. Because the synchronization is not timely, the base station cannot receive the acknowledgement (ACK) message of some previous subframes, and can only retransmit, which is acceptable for LTE, but for LTE-U with limited transmission time, resource waste serious.
在小小区(Small Cell)实际部署场景中,由于单个small cell传输点(TP)所服务的用户设备(User Equipment,UE)数量较少,因此不同的时间段内单个small cell/TP的业务负荷波动比较大,为了节能以及减轻对其他small cell的干扰,在small cell/TP没有业务传输时,可以采用small cell on/off技术根据实际业务情况开启或者关闭small cell/TP。为了让UE可以发现关闭了的small cell/TP以使UE有业务传输时可以打开关闭了的小区,需要small cell/TP周期性地发送发现信号。目前,3GPP已经达成结论,发现信号周期性传输(周期为40ms/80ms/160ms),发现信号中包含PSS/SSS/公共参考信号(Common Reference Signal,CRS),也可以配置信道状态信息参考信号(也可称为探测参考信号)(Channel State Information Reference Signal,CSI-RS)用于small cell/TP的识别,为了让UE可以采用测量呼叫间隙(call Gapping,GAP)对发现信号进行测量,发现信号的长度可配置,FDD为1~5个子帧,TDD为2~4个子帧。In the actual deployment scenario of a small cell, the number of user equipments (UEs) served by a single small cell transmission point (TP) is small, so the traffic load of a single small cell/TP in different time periods. If the small cell/TP has no service transmission, you can use the small cell on/off technology to enable or disable the small cell/TP according to the actual service situation. In order to enable the UE to discover the closed small cell/TP so that the UE can have the closed cell when there is a service transmission, the small cell/TP needs to periodically send the discovery signal. At present, 3GPP has reached a conclusion that it is found that the signal is periodically transmitted (the period is 40ms/80ms/160ms), and the discovery signal includes the PSS/SSS/Common Reference Signal (CRS), and the channel state information reference signal can also be configured. Channel State Information Reference Signal (CSI-RS) is used for the identification of small cell/TP. In order to allow the UE to measure the discovery signal using the measurement call gap (GAP), the signal is found. The length can be configured, the FDD is 1 to 5 subframes, and the TDD is 2 to 4 subframes.
若非授权频段也像small cell一样周期发送发现信号,则由于发现信号中配置了PSS/SSS/CRS序列,故一个很可能的实现方案是利用发现信号实现时间与频率同步。情形一,发现信号接收良好,此时UE可以很好的实现同步;情形二,由于发现信号被WiFi干扰时断时续,粗频偏与粗符号定时保持问题不大,如小数倍频偏精与精符号定时同步可能失去;情形三,部署为802.11ac可占据非授权频段80M或160M带宽,在热点地区竞争激烈,而发现信号又是稀疏信号很容易与WiFi信号相碰,可能会导致较长时间发现信号不能正常接收粗同步失去。除了情况三发现信号可能失效的场景外,非授权频段会有大量可选频点,对UE而言需要在所有频点接收发现信号,实现复杂度与功耗都比small cell情形要高,且发现信号要占据多个子帧开销较大,故从技术角度也需要考虑发现信号失效或者可能的发现信号替代方案。
If the unlicensed band also transmits the discovery signal periodically like the small cell, since the PSS/SSS/CRS sequence is configured in the discovery signal, a very possible implementation scheme is to realize the time and frequency synchronization by using the discovery signal. In case 1, it is found that the signal is well received. At this time, the UE can achieve synchronization well. In the second case, since the discovery signal is intermittently interrupted by WiFi interference, the coarse frequency offset and the coarse symbol timing are not much problematic, such as fractional multiple frequency offset. The timing synchronization between fine and fine symbols may be lost; in the third case, the deployment of 802.11ac can occupy 80M or 160M bandwidth of the unlicensed band, and the competition in the hot spot is fierce, and the discovery signal is sparse and the signal is easily collided with the WiFi signal, which may result in For a long time, it is found that the signal cannot be received normally and the coarse synchronization is lost. Except for the scenario where the signal is found to be invalid, the unlicensed band has a large number of selectable frequency points. For the UE, the discovery signal needs to be received at all frequency points, and the complexity and power consumption are higher than the small cell case. It is found that the signal has a large overhead for occupying multiple subframes, so it is also necessary to consider the discovery of signal failure or a possible discovery signal alternative from a technical point of view.
综上所述,LTE系统如何在非授权频谱上工作还没有给出明确的解决方案。In summary, how the LTE system works on the unlicensed spectrum has not yet given a clear solution.
发明内容Summary of the invention
本申请实施例提供了一种前导信号的传输方法及设备,用以通过前导信号实现在LTE系统在非授权频谱上的占位,进而可以实现LTE系统在非授权频谱上的工作。The embodiment of the present application provides a method and a device for transmitting a preamble signal, which are used to implement a vacancy in an unlicensed spectrum of an LTE system by using a preamble signal, thereby implementing an LTE system working on an unlicensed spectrum.
本申请实施例提供的一种前导信号的发送方法,包括:A method for transmitting a preamble signal provided by an embodiment of the present application includes:
基站当在非授权频谱上随机接入信道时,确定需要发送的前导信号;The base station determines a preamble signal to be transmitted when randomly accessing the channel on the unlicensed spectrum;
所述基站在所述非授权频谱上接入信道的全带宽或部分带宽上,将所述前导信号发送给UE。The base station sends the preamble signal to the UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
本方法中,当在非授权频谱上随机接入信道时,基站确定需要发送的前导信号,所述基站在所述非授权频谱上接入信道的全带宽或部分带宽上,将所述前导信号发送给UE,从而通过前导信号实现LTE系统在非授权频谱上的占位,具体地,LTE-U基站接入信道的时间是随机的,或者既使接入时间为子帧的起始位置,但是基站并没有准备好发送数据,此时必须发送占位符,LTE-U基站通过该方法中提供的前导信号来占位,使得前导信号可以辅助发现信号实现UE的同步等功能。进而可以实现LTE系统在非授权频谱上的工作。In the method, when a channel is randomly accessed on an unlicensed spectrum, the base station determines a preamble signal to be transmitted, and the base station accesses the full bandwidth or part of the bandwidth of the channel on the unlicensed spectrum, and the preamble signal is used. Sending to the UE, the LTE system is occupied by the preamble signal on the unlicensed spectrum. Specifically, the time for the LTE-U base station to access the channel is random, or the access time is the starting position of the subframe. However, the base station is not ready to send data. At this time, the placeholder must be sent. The LTE-U base station is occupied by the preamble signal provided in the method, so that the preamble signal can assist the discovery signal to implement the synchronization of the UE. In turn, the LTE system can work on the unlicensed spectrum.
较佳地,所述前导信号的起始时刻为所述基站随机接入信道的时刻,所述前导信号的终止时刻在数据符号和控制信令的发送时刻之前。Preferably, the start time of the preamble signal is the time of the base station random access channel, and the termination time of the preamble signal is before the data symbol and the transmission time of the control signaling.
较佳地,所述前导信号为包括第一部分、第二部分和第三部分中的至少一个部分的前导信号,其中,第一部分的时间长度为非整数个正交频分复用(OFDM)符号长度,第二部分与第三部分的时间长度都是OFDM符号长度的整数倍。Preferably, the preamble signal is a preamble signal including at least one of the first part, the second part and the third part, wherein the first part has a time length of a non-integer number of orthogonal frequency division multiplexing (OFDM) symbols The length, the length of time of the second part and the third part are all integer multiples of the length of the OFDM symbol.
较佳地,确定需要发送的前导信号,包括:Preferably, the preamble signal to be transmitted is determined, including:
当可用资源不足一个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than one OFDM symbol, determining that the preamble signal to be transmitted includes only the first part;
当可用资源大于或等于一个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resource is greater than or equal to one OFDM symbol, it is determined that the preamble signal to be transmitted includes the second portion.
较佳地,当所述前导信号包括所述第二部分时,该第二部分由一个OFDM符号组成,该OFDM符号由循环前缀CP与两个周期序列组成。Preferably, when the preamble signal includes the second part, the second part is composed of one OFDM symbol, and the OFDM symbol is composed of a cyclic prefix CP and two periodic sequences.
较佳地,确定需要发送的前导信号,包括:Preferably, the preamble signal to be transmitted is determined, including:
当可用资源不足两个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than two OFDM symbols, it is determined that the preamble signal to be transmitted only includes the first part;
当可用资源大于或等于两个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resources are greater than or equal to two OFDM symbols, it is determined that the preamble signal to be transmitted includes the second portion.
较佳地,当所述前导信号包括所述第二部分时,该第二部分由两个OFDM符号组成,其中每一OFDM符号分别对应一个第一循环前缀(CP),或者,两个OFDM符号共用一个第二CP,第一CP的长度是第二CP的长度的一半。Preferably, when the preamble signal includes the second part, the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix (CP), or two OFDM symbols A second CP is shared, and the length of the first CP is half of the length of the second CP.
较佳地,当可用资源大于或等于一个OFDM符号时,所述前导信号包括的所述第二部
分由一个OFDM符号组成,该OFDM符号由一个循环前缀和两个周期序列组成;Preferably, when the available resource is greater than or equal to one OFDM symbol, the second part of the preamble signal is included
The division consists of one OFDM symbol consisting of one cyclic prefix and two periodic sequences;
当可用资源大于或等于两个OFDM符号时,所述前导信号包括的所述第二部分由两个OFDM符号组成,其中第一个OFDM符号由第一循环前缀CP和预设个数的第一周期序列组成,第二个OFDM符号由第二CP和两个第二周期序列组成。When the available resource is greater than or equal to two OFDM symbols, the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number The periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
较佳地,当所述前导信号还包括所述第一部分时,所述第一部分中的序列是基于所述第二部分中的序列生成的;Preferably, when the preamble signal further includes the first portion, the sequence in the first portion is generated based on a sequence in the second portion;
当所述前导信号还包括所述第三部分时,所述第三部分中的序列是基于所述第二部分中的序列生成的。When the preamble further includes the third portion, the sequence in the third portion is generated based on a sequence in the second portion.
相应的,在UE侧,本申请实施例提供的一种前导信号的接收方法,包括:Correspondingly, on the UE side, a method for receiving a preamble signal provided by the embodiment of the present application includes:
UE利用发现信号进行初始同步;The UE performs initial synchronization using the discovery signal;
所述UE当确定需要对前导信号进行检测时,对所述前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的。When determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is a full bandwidth of the base station accessing the channel on the unlicensed spectrum. Or sent on part of the bandwidth.
通过该方法,UE利用发现信号进行初始同步,并且UE当确定需要对前导信号进行检测时,对所述前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的,从而在UE侧,即使发现信号接收非常不好,也可以利用所述前导信号实现同步功能,UE可以检测出来这些前导信号,至于UE是否去检测这些前导信号,是否利用这些前导信号实现同步功能取决于UE对发现信号的接收情况,若发现信号接收良好,前导信号就是占位符,UE可以对前导信号忽视直接去解控制信令与数据就可以了。With this method, the UE performs initial synchronization using the discovery signal, and when determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization using the detected preamble signal, wherein the preamble signal is the base station. Transmitting on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so that on the UE side, even if the signal reception is found to be very bad, the preamble signal can be used to implement the synchronization function, and the UE can detect these preamble signals. As to whether the UE detects these preamble signals, whether to use these preamble signals to implement the synchronization function depends on the UE receiving the discovery signal. If the signal reception is found to be good, the preamble signal is a placeholder, and the UE can ignore the direct decoupling control of the preamble signal. Signaling and data are all there.
较佳地,该方法还包括:Preferably, the method further comprises:
所述UE利用检测到的前导信号确定数据起始位置。The UE determines the data start position using the detected preamble signal.
较佳地,所述UE确定需要对前导信号进行检测,包括:所述UE根据所述发现信号的接收质量确定需要对前导信号进行检测。Preferably, the determining that the UE needs to detect the preamble signal comprises: determining, by the UE, that the preamble signal needs to be detected according to the receiving quality of the discovery signal.
较佳地,所述UE对所述前导信号进行检测,包括:Preferably, the detecting, by the UE, the preamble signal includes:
所述UE利用本地存储的或者即时生成的前导序列在接收信号中对前导信号的第二部分的整体进行检测,或者对前导信号的第二部分的第一个OFDM符号进行检测,或者对前导信号的第二部分的第二个OFDM符号进行检测;The UE detects the entirety of the second part of the preamble signal in the received signal by using the locally stored or immediately generated preamble sequence, or detects the first OFDM symbol of the second part of the preamble signal, or the preamble signal The second OFDM symbol of the second part is detected;
若检测不到前导信号的第二部分,则所述UE放弃检测前导信号;If the second part of the preamble signal is not detected, the UE abandons the detection of the preamble signal;
若完成检测前导信号的第二部分,则所述UE进行前导信号的第三部分的检测。If the second portion of the preamble signal is detected, the UE performs detection of the third portion of the preamble signal.
本申请实施例提供的一种前导信号的发送设备,包括:A transmitting device for a preamble signal provided by the embodiment of the present application includes:
前导信号确定单元,用于当基站在非授权频谱上随机接入信道时,确定需要发送的前导信号;
a preamble signal determining unit, configured to determine a preamble signal to be transmitted when the base station randomly accesses the channel on the unlicensed spectrum;
发送单元,用于在所述非授权频谱上接入信道的全带宽或部分带宽上,将所述前导信号发送给用户设备UE。And a sending unit, configured to send the preamble signal to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
本设备在基站侧,当在非授权频谱上随机接入信道时,确定需要发送的前导信号,在所述非授权频谱上接入信道的全带宽或部分带宽上,将所述前导信号发送给UE,从而通过前导信号实现LTE系统在非授权频谱上的占位,具体地,LTE-U基站接入信道的时间是随机的,或者既使接入时间为子帧的起始位置,但是基站并没有准备好发送数据,此时必须发送占位符,LTE-U基站通过前导信号来占位,使得前导信号可以辅助发现信号实现UE的同步等功能。进而可以实现LTE系统在非授权频谱上的工作。When the device randomly accesses the channel on the unlicensed spectrum, the device determines the preamble signal to be sent, and sends the preamble signal to the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum. The UE, thereby implementing the occupancy of the LTE system on the unlicensed spectrum by using the preamble signal, specifically, the time for the LTE-U base station to access the channel is random, or the access time is the starting position of the subframe, but the base station It is not ready to send data. At this time, the placeholder must be sent. The LTE-U base station uses the preamble signal to occupy the bit, so that the preamble signal can assist the discovery signal to realize the synchronization of the UE. In turn, the LTE system can work on the unlicensed spectrum.
较佳地,所述前导信号的起始时刻为所述基站随机接入信道的时刻,所述前导信号的终止时刻在数据符号和控制信令的发送时刻之前。Preferably, the start time of the preamble signal is the time of the base station random access channel, and the termination time of the preamble signal is before the data symbol and the transmission time of the control signaling.
较佳地,所述前导信号为包括第一部分、第二部分和第三部分中的至少一个部分的前导信号,其中,第一部分的时间长度为非整数个OFDM符号长度,第二部分与第三部分的时间长度都是OFDM符号长度的整数倍。Preferably, the preamble signal is a preamble signal including at least one of the first part, the second part and the third part, wherein the length of the first part is a non-integer number of OFDM symbols, the second part and the third part The length of the part is an integer multiple of the length of the OFDM symbol.
较佳地,所述前导信号确定单元确定需要发送的前导信号时,具体用于:Preferably, when the preamble signal determining unit determines the preamble signal to be transmitted, it is specifically used to:
当可用资源不足一个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than one OFDM symbol, determining that the preamble signal to be transmitted includes only the first part;
当可用资源大于或等于一个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resource is greater than or equal to one OFDM symbol, it is determined that the preamble signal to be transmitted includes the second portion.
较佳地,当所述前导信号包括所述第二部分时,该第二部分由一个OFDM符号组成,该OFDM符号由循环前缀CP与两个周期序列组成。Preferably, when the preamble signal includes the second part, the second part is composed of one OFDM symbol, and the OFDM symbol is composed of a cyclic prefix CP and two periodic sequences.
较佳地,所述前导信号确定单元确定需要发送的前导信号时,具体用于:Preferably, when the preamble signal determining unit determines the preamble signal to be transmitted, it is specifically used to:
当可用资源不足两个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than two OFDM symbols, it is determined that the preamble signal to be transmitted only includes the first part;
当可用资源大于或等于两个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resources are greater than or equal to two OFDM symbols, it is determined that the preamble signal to be transmitted includes the second portion.
较佳地,当所述前导信号包括所述第二部分时,该第二部分由两个OFDM符号组成,其中每一OFDM符号分别对应一个第一循环前缀CP,或者,两个OFDM符号共用一个第二CP,第一CP的长度是第二CP的长度的一半。Preferably, when the preamble signal includes the second part, the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix CP, or two OFDM symbols share one The second CP, the length of the first CP is half of the length of the second CP.
较佳地,当可用资源大于或等于一个OFDM符号时,所述前导信号包括的所述第二部分由一个OFDM符号组成,该OFDM符号由一个循环前缀和两个周期序列组成;Preferably, when the available resource is greater than or equal to one OFDM symbol, the second part of the preamble signal is composed of one OFDM symbol, and the OFDM symbol is composed of one cyclic prefix and two periodic sequences;
当可用资源大于或等于两个OFDM符号时,所述前导信号包括的所述第二部分由两个OFDM符号组成,其中第一个OFDM符号由第一循环前缀CP和预设个数的第一周期序列组成,第二个OFDM符号由第二CP和两个第二周期序列组成。When the available resource is greater than or equal to two OFDM symbols, the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number The periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
较佳地,当所述前导信号还包括所述第一部分时,所述第一部分中的序列是基于所述第二部分中的序列生成的;Preferably, when the preamble signal further includes the first portion, the sequence in the first portion is generated based on a sequence in the second portion;
当所述前导信号还包括所述第三部分时,所述第三部分中的序列是基于所述第二部分中的序列生成的。
When the preamble further includes the third portion, the sequence in the third portion is generated based on a sequence in the second portion.
本申请实施例提供的一种前导信号的接收设备,包括:A receiving device for a preamble signal provided by the embodiment of the present application includes:
初始同步单元,用于利用发现信号进行初始同步;An initial synchronization unit for initial synchronization using the discovery signal;
辅助同步单元,用于当确定需要对前导信号进行检测时,对所述前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的。An auxiliary synchronization unit, configured to detect the preamble signal and perform auxiliary synchronization by using the detected preamble signal when determining that the preamble signal needs to be detected, wherein the preamble signal is that the base station accesses the channel on the unlicensed spectrum Transmitted on full bandwidth or part of the bandwidth.
通过该设备,在UE侧,利用发现信号进行初始同步,并且UE当确定需要对前导信号进行检测时,对所述前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的,从而在UE侧,即使发现信号接收非常不好,也可以利用所述前导信号实现同步功能,UE可以检测出来这些前导信号,至于UE是否去检测这些前导信号,是否利用这些前导信号实现同步功能取决于UE对发现信号的接收情况,若发现信号接收良好,前导信号就是占位符,UE可以对前导信号忽视直接去解控制信令与数据就可以了。Through the device, on the UE side, the initial synchronization is performed by using the discovery signal, and when determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is The base station sends the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so that the UE can detect the preamble signal by using the preamble signal even if the signal reception is very bad. The preamble signal, whether the UE is to detect these preamble signals, whether to use these preamble signals to achieve synchronization function depends on the UE receiving the discovery signal. If the signal reception is found to be good, the preamble signal is a placeholder, and the UE can ignore the preamble signal directly. It is enough to solve the control signaling and data.
较佳地,所述辅助同步单元还用于:利用检测到的前导信号确定数据起始位置。Preferably, the auxiliary synchronization unit is further configured to: determine a data start position by using the detected preamble signal.
较佳地,所述辅助同步单元确定需要对前导信号进行检测时,具体用于:根据所述发现信号的接收质量确定需要对前导信号进行检测。Preferably, when the auxiliary synchronization unit determines that the preamble signal needs to be detected, it is specifically used to: determine that the preamble signal needs to be detected according to the reception quality of the discovery signal.
较佳地,所述辅助同步单元对所述前导信号进行检测时,具体用于:Preferably, when the auxiliary synchronization unit detects the preamble signal, it is specifically used to:
利用本地存储的或者即时生成的前导序列在接收信号中对前导信号的第二部分的整体进行检测,或者对前导信号的第二部分的第一个OFDM符号进行检测,或者对前导信号的第二部分的第二个OFDM符号进行检测;Detecting the entirety of the second portion of the preamble signal in the received signal using a locally stored or immediately generated preamble sequence, or detecting the first OFDM symbol of the second portion of the preamble signal, or second to the preamble signal Part of the second OFDM symbol is detected;
若检测不到前导信号的第二部分,则放弃检测前导信号;If the second part of the preamble signal is not detected, the detection of the preamble signal is abandoned;
若完成检测前导信号的第二部分,则进行前导信号的第三部分的检测。If the second portion of the detection preamble is completed, the detection of the third portion of the preamble is performed.
在基站侧,本申请实施例提供的另一种前导信号的发送设备,包括:On the base station side, another apparatus for transmitting a preamble signal provided by the embodiment of the present application includes:
处理器,用于读取存储器中的程序,执行下列过程:A processor for reading a program in the memory, performing the following process:
当基站在非授权频谱上随机接入信道时,确定需要发送的前导信号;Determining a preamble signal to be transmitted when the base station randomly accesses the channel on the unlicensed spectrum;
在所述非授权频谱上接入信道的全带宽或部分带宽上,通过收发机510将所述前导信号发送给用户设备UE。The preamble signal is sent by the transceiver 510 to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
本设备中,在基站侧,当在非授权频谱上随机接入信道时,确定需要发送的前导信号,在所述非授权频谱上接入信道的全带宽或部分带宽上,将所述前导信号发送给用户设备UE,从而通过前导信号实现LTE系统在非授权频谱上的占位,具体地,LTE-U基站接入信道的时间是随机的,或者既使接入时间为子帧的起始位置,但是基站并没有准备好发送数据,此时必须发送占位符,LTE-U基站通过前导信号来占位,使得前导信号可以辅助发现信号实现UE的同步等功能。进而可以实现LTE系统在非授权频谱上的工作。In the device, on the base station side, when the channel is randomly accessed on the unlicensed spectrum, the preamble signal to be transmitted is determined, and the preamble signal is used on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum. Sending to the user equipment UE, the LTE system is occupied by the preamble signal on the unlicensed spectrum. Specifically, the time for the LTE-U base station to access the channel is random, or the access time is the start of the subframe. Location, but the base station is not ready to send data. At this time, the placeholder must be sent. The LTE-U base station is occupied by the preamble signal, so that the preamble signal can assist the discovery signal to realize the synchronization of the UE. In turn, the LTE system can work on the unlicensed spectrum.
较佳地,所述前导信号的起始时刻为所述基站随机接入信道的时刻,所述前导信号的
终止时刻在数据符号和控制信令的发送时刻之前。Preferably, the start time of the preamble signal is the time when the base station randomly accesses the channel, and the preamble signal
The termination time is before the transmission time of the data symbols and control signaling.
较佳地,所述前导信号为包括第一部分、第二部分和第三部分中的至少一个部分的前导信号,其中,第一部分的时间长度为非整数个OFDM符号长度,第二部分与第三部分的时间长度都是OFDM符号长度的整数倍。Preferably, the preamble signal is a preamble signal including at least one of the first part, the second part and the third part, wherein the length of the first part is a non-integer number of OFDM symbols, the second part and the third part The length of the part is an integer multiple of the length of the OFDM symbol.
较佳地,所述处理器确定需要发送的前导信号时,具体用于:Preferably, when the processor determines the preamble signal that needs to be sent, it is specifically used to:
当可用资源不足一个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than one OFDM symbol, determining that the preamble signal to be transmitted includes only the first part;
当可用资源大于或等于一个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resource is greater than or equal to one OFDM symbol, it is determined that the preamble signal to be transmitted includes the second portion.
较佳地,当所述前导信号包括所述第二部分时,该第二部分由一个OFDM符号组成,该OFDM符号由循环前缀CP与两个周期序列组成。Preferably, when the preamble signal includes the second part, the second part is composed of one OFDM symbol, and the OFDM symbol is composed of a cyclic prefix CP and two periodic sequences.
或者,处理器确定需要发送的前导信号时,具体用于:Alternatively, when the processor determines the preamble to be transmitted, it is specifically used to:
当可用资源不足两个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than two OFDM symbols, it is determined that the preamble signal to be transmitted only includes the first part;
当可用资源大于或等于两个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resources are greater than or equal to two OFDM symbols, it is determined that the preamble signal to be transmitted includes the second portion.
较佳地,当所述前导信号包括所述第二部分时,该第二部分由两个OFDM符号组成,其中每一OFDM符号分别对应一个第一循环前缀CP,或者,两个OFDM符号共用一个第二CP,第一CP的长度是第二CP的长度的一半。Preferably, when the preamble signal includes the second part, the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix CP, or two OFDM symbols share one The second CP, the length of the first CP is half of the length of the second CP.
较佳地,当可用资源大于或等于一个OFDM符号时,所述前导信号包括的所述第二部分由一个OFDM符号组成,该OFDM符号由一个循环前缀和两个周期序列组成;Preferably, when the available resource is greater than or equal to one OFDM symbol, the second part of the preamble signal is composed of one OFDM symbol, and the OFDM symbol is composed of one cyclic prefix and two periodic sequences;
当可用资源大于或等于两个OFDM符号时,所述前导信号包括的所述第二部分由两个OFDM符号组成,其中第一个OFDM符号由第一循环前缀CP和预设个数的第一周期序列组成,第二个OFDM符号由第二CP和两个第二周期序列组成。When the available resource is greater than or equal to two OFDM symbols, the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number The periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
较佳地,当所述前导信号还包括所述第一部分时,所述第一部分中的序列是基于所述第二部分中的序列生成的;Preferably, when the preamble signal further includes the first portion, the sequence in the first portion is generated based on a sequence in the second portion;
当所述前导信号还包括所述第三部分时,所述第三部分中的序列是基于所述第二部分中的序列生成的。When the preamble further includes the third portion, the sequence in the third portion is generated based on a sequence in the second portion.
收发机,用于在处理器的控制下接收和发送相关信息数据。A transceiver for receiving and transmitting related information data under the control of a processor.
较佳地,该设备还包括总线架构,总线架构可以包括任意数量的互联的总线和桥,具体由处理器代表的一个或多个处理器和存储器代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起,这些都是本领域所公知的,因此,本文不再对其进行进一步描述。总线接口提供接口。收发机可以是多个元件,即包括发送机和收发机,提供用于在传输介质上与各种其他装置通信的单元。Preferably, the apparatus further includes a bus architecture, which may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by the processor and various circuits of the memory represented by the memory. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. The transceiver can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
处理器负责管理总线架构和通常的处理,存储器可以存储处理器在执行操作时所使用的数据。
The processor is responsible for managing the bus architecture and the usual processing, and the memory can store the data that the processor uses when performing operations.
相应地,在UE侧,本申请实施例提供的一种前导信号的接收设备,包括:Correspondingly, on the UE side, a receiving device for a preamble signal provided by the embodiment of the present application includes:
处理器,用于读取存储器中的程序,执行下列过程:A processor for reading a program in the memory, performing the following process:
利用通过收发机接收到的发现信号进行初始同步;Initial synchronization using a discovery signal received through the transceiver;
当确定需要对前导信号进行检测时,对所述通过收发机610接收到的前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的。When it is determined that the preamble signal needs to be detected, the preamble signal received by the transceiver 610 is detected and assisted synchronization is performed by using the detected preamble signal, wherein the preamble signal is the base station accessing the unlicensed spectrum. Transmitted on the full bandwidth or part of the bandwidth of the channel.
通过该设备,在UE侧,利用发现信号进行初始同步,并且UE当确定需要对前导信号进行检测时,对所述前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的,从而在UE侧,即使发现信号接收非常不好,也可以利用所述前导信号实现同步功能,UE可以检测出来这些前导信号,至于UE是否去检测这些前导信号,是否利用这些前导信号实现同步功能取决于UE对发现信号的接收情况,若发现信号接收良好,前导信号就是占位符,UE可以对前导信号忽视直接去解控制信令与数据就可以了。Through the device, on the UE side, the initial synchronization is performed by using the discovery signal, and when determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is The base station sends the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so that the UE can detect the preamble signal by using the preamble signal even if the signal reception is very bad. The preamble signal, whether the UE is to detect these preamble signals, whether to use these preamble signals to achieve synchronization function depends on the UE receiving the discovery signal. If the signal reception is found to be good, the preamble signal is a placeholder, and the UE can ignore the preamble signal directly. It is enough to solve the control signaling and data.
较佳地,所述处理器还用于:利用检测到的前导信号确定数据起始位置。Preferably, the processor is further configured to: determine the starting position of the data by using the detected preamble signal.
较佳地,所述处理器确定需要对前导信号进行检测时,具体用于:根据所述发现信号的接收质量确定需要对前导信号进行检测。Preferably, when the processor determines that the preamble signal needs to be detected, it is specifically configured to: determine, according to the receiving quality of the discovery signal, that the preamble signal needs to be detected.
较佳地,所述处理器对所述前导信号进行检测时,具体用于:Preferably, when the processor detects the preamble signal, it is specifically used to:
利用本地存储的或者即时生成的前导序列在接收信号中对前导信号的第二部分的整体进行检测,或者对前导信号的第二部分的第一个OFDM符号进行检测,或者对前导信号的第二部分的第二个OFDM符号进行检测;Detecting the entirety of the second portion of the preamble signal in the received signal using a locally stored or immediately generated preamble sequence, or detecting the first OFDM symbol of the second portion of the preamble signal, or second to the preamble signal Part of the second OFDM symbol is detected;
若检测不到前导信号的第二部分,则放弃检测前导信号;If the second part of the preamble signal is not detected, the detection of the preamble signal is abandoned;
若完成检测前导信号的第二部分,则进行前导信号的第三部分的检测。If the second portion of the detection preamble is completed, the detection of the third portion of the preamble is performed.
以上各单元均可以由处理器等实体装置实现。Each of the above units can be implemented by a physical device such as a processor.
收发机,用于在处理器的控制下接收和发送相关信息数据。A transceiver for receiving and transmitting related information data under the control of a processor.
较佳地,该设备还包括总线架构和用户接口,总线架构可以包括任意数量的互联的总线和桥,具体由处理器代表的一个或多个处理器和存储器代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起,这些都是本领域所公知的,因此,本文不再对其进行进一步描述。总线接口提供接口。收发机可以是多个元件,即包括发送机和接收机,提供用于在传输介质上与各种其他装置通信的单元。针对不同的用户设备,用户接口还可以是能够外接内接需要设备的接口,连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。Preferably, the device further comprises a bus architecture and a user interface, the bus architecture may comprise any number of interconnected buses and bridges, in particular the various circuits of the memory represented by one or more processors and memories represented by the processor are together. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. The transceiver can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. For different user equipments, the user interface may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
处理器负责管理总线架构和通常的处理,存储器可以存储处理器在执行操作时所使用的数据。
The processor is responsible for managing the bus architecture and the usual processing, and the memory can store the data that the processor uses when performing operations.
图1为现有技术中的FDD系统使用的第一类帧结构示意图;1 is a schematic diagram of a first type of frame structure used in an FDD system in the prior art;
图2为现有技术中的TDD系统使用的第二类帧结构示意图;2 is a schematic diagram of a second type of frame structure used in a TDD system in the prior art;
图3为本申请实施例提供的一种前导信号的结构示意图;FIG. 3 is a schematic structural diagram of a preamble according to an embodiment of the present disclosure;
图4为本申请实施例提供的另一种前导信号的结构示意图;4 is a schematic structural diagram of another preamble signal according to an embodiment of the present application;
图5为本申请实施例提供的一种前导信号的发送方法的流程示意图;FIG. 5 is a schematic flowchart of a method for sending a preamble according to an embodiment of the present disclosure;
图6为本申请实施例提供的一种前导信号的接收方法的流程示意图;FIG. 6 is a schematic flowchart of a method for receiving a preamble according to an embodiment of the present disclosure;
图7为本申请实施例提供的一种前导信号的发送设备的结构示意图;FIG. 7 is a schematic structural diagram of a device for transmitting a preamble according to an embodiment of the present disclosure;
图8为本申请实施例提供的一种前导信号的接收设备的结构示意图;FIG. 8 is a schematic structural diagram of a receiving device for a preamble according to an embodiment of the present disclosure;
图9为本申请实施例提供的另一种前导信号的发送设备的结构示意图;FIG. 9 is a schematic structural diagram of another apparatus for transmitting a preamble according to an embodiment of the present disclosure;
图10为本申请实施例提供的另一种前导信号的接收设备的结构示意图。FIG. 10 is a schematic structural diagram of another apparatus for receiving a preamble according to an embodiment of the present disclosure.
本申请实施例提供了一种前导信号的传输方法及设备,用以通过前导信号实现在LTE系统在非授权频谱上的占位,进而可以实现LTE系统在非授权频谱上的工作。The embodiment of the present application provides a method and a device for transmitting a preamble signal, which are used to implement a vacancy in an unlicensed spectrum of an LTE system by using a preamble signal, thereby implementing an LTE system working on an unlicensed spectrum.
考虑到占位符号是必须传输的,故本申请实施例给出了占位符号的新设计,即利用新设计的前导信号实现占位功能,使得其既能完成占位的功能,又可以实现辅助发现信号同步等功能,解决LTE系统在非授权频谱上遇到的网络接入与小区同步的问题。Considering that the placeholder symbol has to be transmitted, the embodiment of the present application provides a new design of the placeholder symbol, that is, the occupancy function is realized by using the newly designed preamble signal, so that the function of the placeholder can be completed and realized. It assists in the discovery of signal synchronization and other functions to solve the problem of network access and cell synchronization encountered by the LTE system on the unlicensed spectrum.
本申请实施例提出当在非授权频谱上随机接入信道时,确定需要发送的前导信号,该前导信号的起点与长度都是自适应可变的,即前导信号的长度和位置不是预先设置好的;基站在非授权频谱上接入信道的全带宽或部分带宽上,将确定的前导信号发送给UE。从而,基站不仅通过该前导信号实现LTE-U基站信号占位,同时具有辅助UE同步等功能。The embodiment of the present application proposes that when a channel is randomly accessed on an unlicensed spectrum, a preamble signal to be transmitted is determined, and a starting point and a length of the preamble signal are adaptively variable, that is, a length and a position of the preamble signal are not preset. The base station transmits the determined preamble signal to the UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum. Therefore, the base station not only implements the LTE-U base station signal occupation by the preamble signal, but also has the functions of assisting the UE synchronization and the like.
本申请实施例中提供的完整的前导信号结构由三部分构成,第一部分(preamble I)与第三部分(preamble III)的长度是可变的,不是固定长度,第二部分(preamble II)长度是相对固定的,且第一部分的时间长度为非整数个正交频分复用(Orthogonal Frequency Division Multiplex,OFDM)符号长度,第二部分与第三部分的时间长度都是OFDM符号的整数倍。实际发送的前导信号可以仅包括上述三个部分中的一部分,也可以包括全部三个部分。The complete preamble signal structure provided in the embodiment of the present application is composed of three parts, and the lengths of the first part (preamble I) and the third part (preamble III) are variable, not fixed length, and the length of the second part (preamble II) It is relatively fixed, and the length of the first part is a non-integer Orthogonal Frequency Division Multiplex (OFDM) symbol length, and the lengths of the second part and the third part are integer multiples of the OFDM symbol. The preamble signal actually transmitted may include only some of the above three parts, and may also include all three parts.
下面给出三种具体方案的举例说明。An illustration of three specific scenarios is given below.
实施方案一,基站确定的需要发给UE的前导信号包括的三部分的时域结构如图3所示,并且符合以下原则: Embodiment 1 The time domain structure of the three parts included in the preamble signal that needs to be sent to the UE determined by the base station is as shown in FIG. 3, and the following principles are met:
preamble II如果存在,从时域看由一个OFDM符号组成,该OFDM符号由循环前缀
(CP)与两个周期序列C组成。周期序列C可以由频域伪噪声(Pseudo-noise Sequence,PN)序列或者zadoff-chu序列或者其它具有很好相关特性的序列产生。Preamble II, if present, consists of an OFDM symbol from the time domain, the OFDM symbol being prefixed by a cyclic prefix
(CP) consists of two periodic sequences C. The periodic sequence C can be generated by a Pseudo-Noise Sequence (PN) sequence or a zadoff-chu sequence or other sequences having very good correlation properties.
preamble I用序列A表示,其长度可变,样点个数为|A|,可以为任何序列,也可以为preamble II的一部分,较佳的,根据preamble I的长度|A|取preamble II序列[CP C C]的前面|A|或者后面|A|个样点作为preamble I,若|A|=0则该preamble I部分不存在。The preamble I is represented by the sequence A, and its length is variable, and the number of samples is |A|, which may be any sequence or part of the preamble II. Preferably, the preamble II sequence is taken according to the length of the preamble I |A| The front |A| or the following |A| of [CP C C] is used as the preamble I. If |A|=0, the preamble I part does not exist.
preamble III用序列D表示,如果存在,其长度一定是整数个OFDM符号,较佳的,可是preamble II序列[CP C C]的重复,长度|D|由基站确定,根据该长度可以确定重复的OFDM符号的个数,若|D|=0则该preamble III部分不存在。The preamble III is represented by the sequence D. If it exists, its length must be an integer number of OFDM symbols. Preferably, the repetition of the preamble II sequence [CP C C], the length |D| is determined by the base station, and the repetition can be determined according to the length. The number of OFDM symbols, if |D|=0, the preamble III part does not exist.
即较佳的preamble I与preamble III都是由preamble II生成的,其长度自适应变化。That is, the preferred preamble I and preamble III are both generated by the preamble II, and their lengths are adaptively changed.
此方案中,前导信号的三个部分的确定遵循以下规则:In this scenario, the determination of the three parts of the preamble follows the following rules:
可用资源不足一个OFDM符号时,只配置preamble I;When the available resources are less than one OFDM symbol, only preamble I is configured;
可用资源大于或等于一个OFDM符号时,可以配置preamble II;When the available resources are greater than or equal to one OFDM symbol, the preamble II can be configured;
若没有preamble II,后面不配置preamble III;If there is no preamble II, no preamble III is configured later;
配置有preamble II时,可以配置或不配置preamble I与preamble III;Preamble I and preamble III can be configured or not configured when the preamble II is configured.
preamble I长度不定,但时间长度一定小于两个OFDM符号;The length of the preamble I is variable, but the length of time must be less than two OFDM symbols;
preamble III如果存在,其长度一定是OFDM符号的整数倍。The preamble III, if present, must be an integer multiple of the OFDM symbol.
由于前导信号的序列有固定的周期结构,故UE可以识别出前导信号结束的时间,既可以完成竞争接入的占位功能又能让UE完成时间与频率的同步过程。Since the sequence of the preamble signal has a fixed periodic structure, the UE can recognize the end time of the preamble signal, and can complete the occupancy function of the contention access and enable the UE to complete the synchronization process of time and frequency.
实施例1:Example 1:
假设基站随机接入信道时,位于某一子帧的第M个OFDM符号,第N个样点上,采用常规CP时,M为正整数,且小于或等于14,N为正整数,其大小与采样速率相关。It is assumed that when the base station randomly accesses the channel, it is located in the Mth OFDM symbol of a certain subframe, and on the Nth sample, when a conventional CP is used, M is a positive integer and is less than or equal to 14, and N is a positive integer, and its size Corresponding to the sampling rate.
若M=1,N=1,则基站接入时刻位于某子帧的起始位置,如果此时基站已经做好发送数据的准备,可不发送占位符,设置preamble I、preamble II、preamble III的长度皆为0;If M=1, N=1, the base station access time is located at the beginning of a certain subframe. If the base station is ready to send data at this time, the placeholder is not sent, and the preamble I, preamble II, and preamble III are set. The length is 0;
若13>M>1,N>1,即基站随机接入时刻不是子帧内某个OFDM符号的起始位置,且接入时刻到下一个完整子帧初始位置至少包含两个完整的OFDM符号,基站可以在第M个OFDM符号的第N个样点到该OFDM符号的最后的一个样点上发送preamble I,在第M+1个OFDM符号上发送preamble II,在接入子帧的第M+1到第14个OFDM上发送preamble III。此种情形UE可以首先对preamble II进行检测,例如相关检测,由于UE已经利用发现信号获得了粗同步,故preamble II的位置会找的比较准,然后可以利用preamble II的周期特性进行小数倍频偏估计,与精确符号定时。由于此时存在preamble III也可以利用preamble II与preamble III的重复特性获得比仅仅利用preamble II更为精确的精同步估计。If 13>M>1, N>1, that is, the base station random access time is not the starting position of an OFDM symbol in the subframe, and the access time to the next complete subframe initial position includes at least two complete OFDM symbols. The base station may send the preamble I on the Nth sample of the Mth OFDM symbol to the last sample of the OFDM symbol, and transmit the preamble II on the M+1th OFDM symbol, in the access subframe The preamble III is transmitted from M+1 to the 14th OFDM. In this case, the UE may first detect the preamble II, for example, correlation detection. Since the UE has obtained the coarse synchronization by using the discovery signal, the position of the preamble II is relatively accurate, and then the period characteristic of the preamble II can be used to perform the fractional multiple. Frequency offset estimation, with precise symbol timing. Since preamble III can also be used at this time, the repetitive characteristics of preamble II and preamble III can be used to obtain a more accurate fine synchronization estimation than using only preamble II.
若M=13,N>1,即基站随机接入时刻不是子帧内某个OFDM符号的起始位置,且接入时刻到下一个完整子帧初始位置只包含一个完整的OFDM符号,则基站可以在第M个
OFDM符号的第N个样点到该OFDM符号的最后的一个样点上发送preamble I,在第14个OFDM符号上发送preamble II,将preamble III的长度配置为0。此种情形可以仅仅利用preamble II辅助发现信号实现UE的精同步。If M=13, N>1, that is, the base station random access time is not the starting position of an OFDM symbol in the subframe, and the access time to the next complete subframe initial position includes only one complete OFDM symbol, then the base station Can be in the Mth
The Nth sample of the OFDM symbol transmits preamble I to the last sample of the OFDM symbol, the preamble II is transmitted on the 14th OFDM symbol, and the length of the preamble III is configured to be 0. In this case, the preamble II assisted discovery signal can be used to achieve fine synchronization of the UE.
若M=14,N>1,即到下一个完整子帧之前没有一个完整OFDM符号,此时基站可以在第14个OFDM符号的第N个样点到该OFDM符号的最后的一个样点上发送preamble I,不配置preamble II与preamble III。preamble II与preamble III在作为占位符的同时辅助发现信号进行精同步,可以克服所述的利用发现信号在情形二精同步不准确的缺点,既使发现信号接收良好时,基站并不能判断发现信号是否接收良好,基站可以发送preamble II与preamble III,而由UE决定是否利用其进行增强精同步估计。If M=14, N>1, that is, there is no complete OFDM symbol before the next complete subframe, and the base station can be at the Nth sample of the 14th OFDM symbol to the last sample of the OFDM symbol. Send preamble I without preamble II and preamble III. The preamble II and the preamble III assist in the discovery of the signal for fine synchronization while acting as a placeholder, which can overcome the shortcomings of the use of the discovery signal in the second case, and the base station cannot judge the discovery even if the signal is well received. Whether the signal is well received, the base station can transmit the preamble II and the preamble III, and the UE decides whether to use it for enhanced fine synchronization estimation.
由于前导信号要能起到占位的功能,因此较佳的,前导信号占据全部的发送带宽,但也可以只占据部分带宽,即基站在非授权频谱上接入信道的全带宽或部分带宽上,将确定的前导信号发送给UE。Since the preamble signal can function as a placeholder, preferably, the preamble signal occupies the entire transmission bandwidth, but can also occupy only part of the bandwidth, that is, the base station accesses the full bandwidth or part of the bandwidth of the channel on the unlicensed spectrum. And transmitting the determined preamble signal to the UE.
实施方案二:Implementation 2:
前导信号仍然由三部分构成,但与上面方案一不同的是,将方案一中占一个OFDM符号的preamble II用占两个OFDM符号的preamble II代替。两个OFDM符号的preamble II组成形式为[CP1 C1 CP1 C1]或[CP2 C1 C1]。前者采用传统的循环前缀,即第一循环前缀CP1,[CP1 C1]构成一个OFDM符号,后者两个OFDM符号共用一个循环前缀,即第二循环前缀CP2,其中CP1长度是CP2长度的一半。The preamble signal is still composed of three parts, but unlike the above scheme 1, the preamble II occupying one OFDM symbol in scheme one is replaced by the preamble II occupying two OFDM symbols. The preamble II form of two OFDM symbols is [CP1 C1 CP1 C1] or [CP2 C1 C1]. The former adopts the traditional cyclic prefix, that is, the first cyclic prefix CP1, [CP1 C1] constitutes one OFDM symbol, and the latter two OFDM symbols share one cyclic prefix, that is, the second cyclic prefix CP2, wherein the length of CP1 is half of the length of CP2.
preamble I如果存在,用序列A表示,样点个数为|A|,其长度小于preamble II,即小于两个OFDM符号长度,可以为任何序列,较佳的,根据preamble I的长度|A|取preamble II的序列的前面|A|或者后面|A|个样点作为preamble I,若|A|=0则该preamble I部分不存在。Preamble I, if present, is represented by sequence A, the number of samples is |A|, and its length is less than preamble II, that is, less than two OFDM symbol lengths, which may be any sequence, preferably, according to the length of preamble I |A| Take the front |A| or the later |A| samples of the preamble II sequence as preamble I. If |A|=0, the preamble I part does not exist.
preamble III用序列D表示,如果存在,其长度一定是整数个OFDM符号,较佳的,可是preamble II序列[CP1 C1]的重复,长度|D|由基站确定,根据其长度可以确定OFDM符号的重复个数,若|D|=0则该preamble III部分不存在。The preamble III is represented by the sequence D. If it exists, its length must be an integer number of OFDM symbols. Preferably, the repetition of the preamble II sequence [CP1 C1], the length |D| is determined by the base station, and the OFDM symbol can be determined according to the length thereof. Repeat the number. If |D|=0, the preamble III part does not exist.
此方案中,前导信号的这三个部分的确定(或者称为配置)遵循以下规则:In this scenario, the determination (or configuration) of these three parts of the preamble follows the following rules:
可用资源不足两个OFDM符号时,只配置preamble I;When the available resources are less than two OFDM symbols, only preamble I is configured;
当可用资源大于或等于两个OFDM符号时,可以配置preamble II;When the available resources are greater than or equal to two OFDM symbols, the preamble II can be configured;
若没有preamble II,后面不配置preamble III;If there is no preamble II, no preamble III is configured later;
配置preamble II时,可以配置或不配置preamble I与preamble III;Preamble I and preamble III can be configured or not configured when the preamble II is configured.
preamble I长度不定,但时间一定小于两个OFDM符号;The length of the preamble I is variable, but the time must be less than two OFDM symbols;
preamble III如果存在,其时间长度一定是OFDM符号的整数倍。If preamble III is present, its length must be an integer multiple of the OFDM symbol.
实施例2:Example 2:
假设基站随机接入信道时位于某一子帧的第M个OFDM符号,第N个样点,且M=12,
N>1,即接入时刻不是子帧内某个OFDM符号的起始位置,且接入时刻到下一个完整子帧初始位置包含两个完整的OFDM符号,则基站可以在第12个OFDM符号的第N个样点到该OFDM符号的最后的一个样点上发送preamble I,在第13与第14个OFDM符号上发送preamble II,将preamble III的长度配置为0。Suppose that the base station is located in the Mth OFDM symbol of a certain subframe, the Nth sample, and M=12, when the base station randomly accesses the channel.
N>1, that is, the access time is not the starting position of an OFDM symbol in the subframe, and the access time to the next complete subframe initial position includes two complete OFDM symbols, and the base station can be in the 12th OFDM symbol. The Nth sample transmits a preamble I to the last sample of the OFDM symbol, the preamble II is transmitted on the 13th and 14th OFDM symbols, and the length of the preamble III is configured to be 0.
利用preamble II中两个周期序列可以辅助发现信号很好的实现精同步估计,可以克服前面所述的发现信号在情形二精同步不准确的缺点,其功能与方案一类似。The use of two periodic sequences in preamble II can help the discovery signal to achieve fine synchronization estimation well, which can overcome the shortcomings of the above-mentioned discovery signal in the case of inaccurate synchronization. The function is similar to that of scheme 1.
由于前导信号要能起到占位的功能,因此较佳的,前导信号占据全部的发送带宽,但也可以只占据部分带宽,即基站在非授权频谱上接入信道的全带宽或部分带宽上,将确定的前导信号发送给UE。Since the preamble signal can function as a placeholder, preferably, the preamble signal occupies the entire transmission bandwidth, but can also occupy only part of the bandwidth, that is, the base station accesses the full bandwidth or part of the bandwidth of the channel on the unlicensed spectrum. And transmitting the determined preamble signal to the UE.
实施方案三,基站确定的需要发给UE的前导信号包括的三部分的时域结构如图4所示,并且符合以下原则:Embodiment 3: The time domain structure of the three parts included in the preamble signal that needs to be sent to the UE determined by the base station is as shown in FIG. 4, and the following principles are met:
preamble II如果存在,从时域看由两个OFDM符号组成,第一个OFDM符号由第一循环前缀CP1与预设个数T(T大于或等于1)个时域周期序列B组成;第二个OFDM符号由第二循环前缀CP2与两个周期序列C组成,该周期序列B与C都可以由频域PN序列或zadoff-chu序列或者其它具有很好相关特性的序列产生。基站需要预先确定周期序列B的个数T。Preamble II, if present, consists of two OFDM symbols from the time domain, the first OFDM symbol consisting of a first cyclic prefix CP1 and a preset number T (T is greater than or equal to 1) time domain periodic sequence B; The OFDM symbols are composed of a second cyclic prefix CP2 and two periodic sequences C, both of which can be generated by a frequency domain PN sequence or a zadoff-chu sequence or other sequences having very good correlation properties. The base station needs to determine the number T of periodic sequences B in advance.
实施例3:Example 3:
假设LTE-U系统工作在5.8G频段,最大的晶振误差为10ppm,则最大频偏为116K,考虑到LTE-U系统工作的环境与WiFi类似,不支持高速移动,则其最大多普勒频移远远小于1K,而子载波间隔为15K,故最大归一化频偏为7.8,而T个周期序列B整数倍频偏的估计范围为T/2,故周期序列B的个数可以确定为T=16,如果LTE系统晶振误差可以降到5ppm,则T=8即可,对此可以根据当前的工业水平确定。Assuming that the LTE-U system operates in the 5.8G band and the maximum crystal error is 10ppm, the maximum frequency offset is 116K. Considering that the LTE-U system works in the same environment as WiFi and does not support high-speed mobile, its maximum Doppler frequency. The shift is much smaller than 1K, and the subcarrier spacing is 15K, so the maximum normalized frequency offset is 7.8, and the estimated range of the integer multiple of the T periodic sequence B is T/2, so the number of periodic sequences B can be determined. For T=16, if the crystal error of the LTE system can be reduced to 5 ppm, then T=8, which can be determined according to the current industry level.
preamble I用序列A表示,其长度可变,样点个数为|A|,可以为任何序列,也可以为preamble II的一部分,较佳的,根据preamble I的长度|A|取preamble II的第二个OFDM符号序列[CP2 C C]的前面|A|或者后面|A|个样点作为preamble I,若|A|=0,则该preamble I部分不存在。The preamble I is represented by the sequence A, and its length is variable. The number of samples is |A|, which may be any sequence, or may be part of the preamble II. Preferably, according to the length of the preamble I |A| The front |A| or the following |A| samples of the second OFDM symbol sequence [CP2 C C] are used as preamble I, and if |A|=0, the preamble I portion does not exist.
preamble III用序列D表示,如果存在,其长度一定是整数个OFDM符号,较佳的,可以是preamble II的第二个OFDM符号序列[CP2 C C]的重复,长度|D|由基站确定,根据该长度可以确定OFDM符号的重复个数,若|D|=0,则该preamble III部分不存在。The preamble III is represented by the sequence D. If it exists, its length must be an integer number of OFDM symbols. Preferably, it may be a repetition of the second OFDM symbol sequence [CP2 C C] of the preamble II, and the length |D| is determined by the base station. The number of repetitions of the OFDM symbol can be determined according to the length. If |D|=0, the preamble III portion does not exist.
此方案中,前导信号的三个部分的确定遵循以下规则:In this scenario, the determination of the three parts of the preamble follows the following rules:
可用资源不足一个OFDM符号时,只配置preamble I;When the available resources are less than one OFDM symbol, only preamble I is configured;
可用资源大于或等于一个OFDM符号时,可以配置preamble II的第二个OFDM符号[CP2 C C];
When the available resource is greater than or equal to one OFDM symbol, the second OFDM symbol [CP2 C C] of the preamble II may be configured;
可用资源大于或等于两个OFDM符号时,可以配置完整的preamble II;When the available resources are greater than or equal to two OFDM symbols, the complete preamble II can be configured;
若没有或没有完整的preamble II,后面不配置preamble III;If there is no or no complete preamble II, no preamble III is configured behind;
配置preamble II时,可以配置或不配置preamble I与preamble III;Preamble I and preamble III can be configured or not configured when the preamble II is configured.
preamble I时间长度可变,不固定,但其时间长度一定小于一个OFDM符号;The preamble I has a variable length and is not fixed, but the length of time is necessarily less than one OFDM symbol;
preamble III如果存在,其长度一定是OFDM符号时间的整数倍。The preamble III, if present, must be an integer multiple of the OFDM symbol time.
实施例4:Example 4:
假设基站接入信道时位于某一子帧的第M个OFDM符号,第N个样点上,采用常规CP时,M为正整数,且小于或等于14,N为正整数,其大小与采用速率相关。Suppose that when the base station accesses the channel, it is located in the Mth OFDM symbol of a certain subframe. On the Nth sample, when the conventional CP is used, M is a positive integer and is less than or equal to 14, and N is a positive integer. Rate related.
若M=1,N=1,则基站随机接入时刻位于一子帧的起始位置,如果此时基站已经做好发送数据的准备,可不需要发送占位符,可设置preamble I、preamble II、preamble III的长度皆为0;If M=1, N=1, the base station random access time is located at the beginning of a subframe. If the base station is ready to send data at this time, there is no need to send a placeholder, and preamble I and preamble II can be set. The length of the preamble III is 0;
若M=12,N>1,即基站随机接入时刻不是子帧内某个OFDM符号的起始位置,且接入时刻到下一个完整子帧初始位置至少包含两个完整的OFDM符号,基站可以在第M个OFDM符号的第N个样点到该OFDM符号的最后的一个样点上发送preamble I,在第M+1与第M+2个OFDM符号上发送preamble II。此种情形UE可以首先检测preamble II的第一个OFDM符号中的周期序列B,利用序列B获得了粗时间与频率同步,然后可以利用preamble II的第二个OFDM符号的周期序列C,获得小数倍频偏估计,与精确符号定时。If M=12, N>1, that is, the base station random access time is not the starting position of an OFDM symbol in the subframe, and the access time to the next complete subframe initial position includes at least two complete OFDM symbols, the base station The preamble I may be transmitted on the Nth sample of the Mth OFDM symbol to the last sample of the OFDM symbol, and the preamble II may be transmitted on the M+1th and M+2th OFDM symbols. In this case, the UE may first detect the periodic sequence B in the first OFDM symbol of the preamble II, obtain the coarse time and frequency synchronization by using the sequence B, and then obtain the small periodic sequence C of the second OFDM symbol of the preamble II to obtain a small Several times the frequency offset estimation, with precise symbol timing.
若M<12,N>1,则至少包含三个完整的OFDM符号,基站可以在第M个OFDM符号的第N个样点到该OFDM符号的最后的一个样点上发送preamble I,在第M+1与第M+2个OFDM符号上发送preamble II,在第M+3到可用的最后一个OFDM符号发送preamble III。同样利用序列B获得了粗时间与频率同步,由于此时存在preamble III,故可利用preamble III是preamble II的第二个OFDM符号重复的特性,联合preamble II与preamble III一起获得比仅仅利用preamble II更为精确的精同步估计。由于可以利用周期序列B实现粗同步,故可以克服前面所述情形三发现信号失效的场景。If M<12, N>1, at least three complete OFDM symbols are included, and the base station may send the preamble I on the Nth sample of the Mth OFDM symbol to the last sample of the OFDM symbol. The preamble II is transmitted on the M+1 and the M+2 OFDM symbols, and the preamble III is transmitted in the M+3 to the last available OFDM symbol. Similarly, the sequence B is used to obtain the coarse time and frequency synchronization. Since the preamble III exists at this time, the preamble III can be used as the second OFDM symbol repetition feature of the preamble II, and the preamble II and the preamble III are combined to obtain only the preamble II. More accurate fine synchronization estimation. Since the coarse synchronization can be realized by the periodic sequence B, it is possible to overcome the scenario in which the above-mentioned situation 3 finds that the signal is invalid.
当M=13,N>1时,只存在一个完整的OFDM符号可用,此种情形基站首先在第13个OFDM符号的第N个样点到该OFDM符号的最后的一个样点上发送preamble I,然后在第14个OFDM符号上发送preamble II的第二个OFDM符号[CP2 C C],此时便退化为方案一的特例,可以利用该OFDM符号获得小数倍频偏估计,与精确符号定时,克服前面所述的发现信号在情形二精同步不准确的缺点。When M=13, N>1, there is only one complete OFDM symbol available. In this case, the base station first transmits the preamble I on the Nth sample of the 13th OFDM symbol to the last sample of the OFDM symbol. And then transmitting the second OFDM symbol [CP2 C C] of the preamble II on the 14th OFDM symbol, and then degenerates to the special case of the first scheme, and the OFDM symbol can be used to obtain the fractional multiple offset estimation and the exact symbol. Timing, overcomes the shortcomings of the previously found discovery signal in the case of two-in-one synchronization inaccuracy.
基站可以配置图4所示结构的前导信号,可以由UE来决定是否利用该前导信号实现粗同步与精同步。由于本申请实施例提供的前导信号要能起到占位的功能,因此较佳的前导信号占据全部的发送带宽,但也可以只占据部分带宽,即基站在非授权频谱上接入信道的全带宽或部分带宽上,将确定的前导信号发送给UE。
The base station can configure the preamble signal of the structure shown in FIG. 4, and the UE can decide whether to use the preamble signal to implement coarse synchronization and fine synchronization. Since the preamble signal provided by the embodiment of the present application is capable of occupying a placeholder function, a preferred preamble signal occupies the entire transmission bandwidth, but may also occupy only part of the bandwidth, that is, the base station accesses the channel on the unlicensed spectrum. The determined preamble signal is sent to the UE on the bandwidth or part of the bandwidth.
前面实施例中从基站随机接入信道时刻起,到下一个完整子帧之前的OFDM号都用来传输前导信号作为占位符,事实上基站随机接入信道的时刻所处的子帧的部分OFDM符号,若可以用来传数据,本申请实施例方案同样适用,则由基站配置前导信号的最后一个OFDM符号,较佳的,该OFDM符号在数据OFDM符号之前或者与第一个数据OFDM符号重合。此时,前导信号在完成占位符功能的同时,还可以实现辅助发现信号同步,指示数据符号的起始位置。In the foregoing embodiment, the OFDM number from the time when the base station randomly accesses the channel to the next complete subframe is used to transmit the preamble as a placeholder, in fact, the part of the subframe in which the base station randomly accesses the channel. The OFDM symbol, if it can be used for transmitting data, the solution of the embodiment of the present application is also applicable, and the base station configures the last OFDM symbol of the preamble signal. Preferably, the OFDM symbol is before the data OFDM symbol or with the first data OFDM symbol. coincide. At this time, the preamble signal can also realize the auxiliary discovery signal synchronization while indicating the start position of the data symbol while completing the placeholder function.
实施例5:Example 5:
假设基站接入信道时位于某一子帧的第M个OFDM符号,第N个样点,且M=2,N>1,即接入时刻不是子帧内某个OFDM符号的起始位置,且采用常规CP,除了第一个与第二个OFDM符号,还有12个完整OFDM符号可以利用。若基站配置欲将接入时刻之后的12个OFDM符号都用于传输数据与信令,则在第二个OFDM符号的第N个样点到该OFDM符号的最后的一个样点上发送preamble I;若基站欲将接入时刻之后的11个OFDM符号都用于传输数据与信令,则可在第三个OFDM符号上发送preamble II,在第二个OFDM符号的第N个样点到该OFDM符号的最后的一个样点上发送preamble I。Assume that the base station accesses the channel when the Mth OFDM symbol of the certain subframe, the Nth sample, and M=2, N>1, that is, the access time is not the starting position of an OFDM symbol in the subframe, And with a conventional CP, in addition to the first and second OFDM symbols, there are 12 full OFDM symbols available. If the base station is configured to use 12 OFDM symbols after the access time for transmitting data and signaling, send the preamble I on the Nth sample of the second OFDM symbol to the last sample of the OFDM symbol. If the base station wants to use 11 OFDM symbols after the access time for transmitting data and signaling, the preamble II may be sent on the third OFDM symbol, and the Nth sample of the second OFDM symbol is used. The preamble I is sent on the last sample of the OFDM symbol.
综上,参见图5,本申请实施例提供的一种前导信号的发送方法,包括:In summary, referring to FIG. 5, a method for transmitting a preamble signal according to an embodiment of the present application includes:
S101、基站当在非授权频谱上随机接入信道时,确定需要发送的前导信号;S101. When a base station randomly accesses a channel on an unlicensed spectrum, determining, by the base station, a preamble signal to be sent;
S102、所述基站在所述非授权频谱上接入信道的全带宽或部分带宽上,将所述前导信号发送给用户设备UE。S102. The base station sends the preamble signal to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
本方法中,当在非授权频谱上随机接入信道时,基站确定需要发送的前导信号,所述基站在所述非授权频谱上接入信道的全带宽或部分带宽上,将所述前导信号发送给用户设备UE,从而通过前导信号实现LTE系统在非授权频谱上的占位,具体地,LTE-U基站接入信道的时间是随机的,或者既使接入时间为子帧的起始位置,但是基站并没有准备好发送数据,此时必须发送占位符,LTE-U基站通过该方法中提供的前导信号来占位,使得前导信号可以辅助发现信号实现UE的同步等功能。进而可以实现LTE系统在非授权频谱上的工作。In the method, when a channel is randomly accessed on an unlicensed spectrum, the base station determines a preamble signal to be transmitted, and the base station accesses the full bandwidth or part of the bandwidth of the channel on the unlicensed spectrum, and the preamble signal is used. Sending to the user equipment UE, the LTE system is occupied by the preamble signal on the unlicensed spectrum. Specifically, the time for the LTE-U base station to access the channel is random, or the access time is the start of the subframe. Location, but the base station is not ready to send data. At this time, the placeholder must be sent. The LTE-U base station is occupied by the preamble signal provided in the method, so that the preamble signal can assist the discovery signal to implement the synchronization of the UE and the like. In turn, the LTE system can work on the unlicensed spectrum.
较佳地,所述前导信号的起始时刻为所述基站随机接入信道的时刻,所述前导信号的终止时刻在数据符号和控制信令的发送时刻之前。Preferably, the start time of the preamble signal is the time of the base station random access channel, and the termination time of the preamble signal is before the data symbol and the transmission time of the control signaling.
较佳地,所述前导信号为包括第一部分、第二部分和第三部分中的至少一个部分的前导信号,其中,第一部分的时间长度为非整数个正交频分复用OFDM符号长度,第二部分与第三部分的时间长度都是OFDM符号长度的整数倍。Preferably, the preamble signal is a preamble signal including at least one of the first part, the second part, and the third part, wherein the length of the first part is a non-integer number of orthogonal frequency division multiplexing OFDM symbol lengths, The length of time of the second part and the third part is an integer multiple of the length of the OFDM symbol.
较佳地,确定需要发送的前导信号,包括:Preferably, the preamble signal to be transmitted is determined, including:
当可用资源不足一个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than one OFDM symbol, determining that the preamble signal to be transmitted includes only the first part;
当可用资源大于或等于一个OFDM符号时,确定需要发送的前导信号包括第二部分。
When the available resource is greater than or equal to one OFDM symbol, it is determined that the preamble signal to be transmitted includes the second portion.
较佳地,当所述前导信号包括所述第二部分时,该第二部分由一个OFDM符号组成,该OFDM符号由循环前缀CP与两个周期序列组成。Preferably, when the preamble signal includes the second part, the second part is composed of one OFDM symbol, and the OFDM symbol is composed of a cyclic prefix CP and two periodic sequences.
较佳地,确定需要发送的前导信号,包括:Preferably, the preamble signal to be transmitted is determined, including:
当可用资源不足两个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than two OFDM symbols, it is determined that the preamble signal to be transmitted only includes the first part;
当可用资源大于或等于两个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resources are greater than or equal to two OFDM symbols, it is determined that the preamble signal to be transmitted includes the second portion.
较佳地,当所述前导信号包括所述第二部分时,该第二部分由两个OFDM符号组成,其中每一OFDM符号分别对应一个第一循环前缀CP,或者,两个OFDM符号共用一个第二CP,第一CP的长度是第二CP的长度的一半。Preferably, when the preamble signal includes the second part, the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix CP, or two OFDM symbols share one The second CP, the length of the first CP is half of the length of the second CP.
较佳地,当可用资源大于或等于一个OFDM符号时,所述前导信号包括的所述第二部分由一个OFDM符号组成,该OFDM符号由一个循环前缀和两个周期序列组成;Preferably, when the available resource is greater than or equal to one OFDM symbol, the second part of the preamble signal is composed of one OFDM symbol, and the OFDM symbol is composed of one cyclic prefix and two periodic sequences;
当可用资源大于或等于两个OFDM符号时,所述前导信号包括的所述第二部分由两个OFDM符号组成,其中第一个OFDM符号由第一循环前缀CP和预设个数的第一周期序列组成,第二个OFDM符号由第二CP和两个第二周期序列组成。When the available resource is greater than or equal to two OFDM symbols, the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number The periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
较佳地,当所述前导信号还包括所述第一部分时,所述第一部分中的序列是基于所述第二部分中的序列生成的;Preferably, when the preamble signal further includes the first portion, the sequence in the first portion is generated based on a sequence in the second portion;
当所述前导信号还包括所述第三部分时,所述第三部分中的序列是基于所述第二部分中的序列生成的。When the preamble further includes the third portion, the sequence in the third portion is generated based on a sequence in the second portion.
相应的,在UE侧,参见图6,本申请实施例提供的一种前导信号的接收方法,包括:Correspondingly, on the UE side, referring to FIG. 6, a method for receiving a preamble signal according to an embodiment of the present application includes:
S201、用户设备UE利用发现信号进行初始同步;S201. The user equipment UE performs initial synchronization by using a discovery signal.
S202、所述UE当确定需要对前导信号进行检测时,对所述前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的。S202. When determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is that the base station accesses a channel on an unlicensed spectrum. Transmitted on full bandwidth or part of the bandwidth.
通过该方法,UE利用发现信号进行初始同步,并且UE当确定需要对前导信号进行检测时,对所述前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的,从而在UE侧,即使发现信号接收非常不好,也可以利用所述前导信号实现同步功能,UE可以检测出来这些前导信号,至于UE是否去检测这些前导信号,是否利用这些前导信号实现同步功能取决于UE对发现信号的接收情况,若发现信号接收良好,前导信号就是占位符,UE可以对前导信号忽视直接去解控制信令与数据就可以了。With this method, the UE performs initial synchronization using the discovery signal, and when determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization using the detected preamble signal, wherein the preamble signal is the base station. Transmitting on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so that on the UE side, even if the signal reception is found to be very bad, the preamble signal can be used to implement the synchronization function, and the UE can detect these preamble signals. As to whether the UE detects these preamble signals, whether to use these preamble signals to implement the synchronization function depends on the UE receiving the discovery signal. If the signal reception is found to be good, the preamble signal is a placeholder, and the UE can ignore the direct decoupling control of the preamble signal. Signaling and data are all there.
较佳地,该方法还包括:Preferably, the method further comprises:
所述UE利用检测到的前导信号确定数据起始位置。The UE determines the data start position using the detected preamble signal.
较佳地,所述UE确定需要对前导信号进行检测,包括:所述UE根据所述发现信号的接收质量确定需要对前导信号进行检测。
Preferably, the determining that the UE needs to detect the preamble signal comprises: determining, by the UE, that the preamble signal needs to be detected according to the receiving quality of the discovery signal.
较佳地,所述UE对所述前导信号进行检测,包括:Preferably, the detecting, by the UE, the preamble signal includes:
所述UE利用本地存储的或者即时生成的前导序列在接收信号中对前导信号的第二部分的整体进行检测,或者对前导信号的第二部分的第一个OFDM符号进行检测,或者对前导信号的第二部分的第二个OFDM符号进行检测;The UE detects the entirety of the second part of the preamble signal in the received signal by using the locally stored or immediately generated preamble sequence, or detects the first OFDM symbol of the second part of the preamble signal, or the preamble signal The second OFDM symbol of the second part is detected;
若检测不到前导信号的第二部分,则所述UE放弃检测前导信号;If the second part of the preamble signal is not detected, the UE abandons the detection of the preamble signal;
若完成检测前导信号的第二部分,则所述UE进行前导信号的第三部分的检测。If the second portion of the preamble signal is detected, the UE performs detection of the third portion of the preamble signal.
例如,在UE侧,前导信号的接收处理方法包括:For example, on the UE side, a method for receiving a preamble signal includes:
步骤一:UE利用发现信号进行初始的同步估计;Step 1: The UE uses the discovery signal to perform initial synchronization estimation;
步骤二:UE根据发现信号的接收质量,决定是否检测前导信号;例如,若发现信号的接收质量良好(具体的判断标准可以根据实际需要进行设置),无需进一步检测前导信号即可实现精确的同步,则不检测前导信号,仅将前导信号作为占位符,若发现信号的接收质量不好,则确定需要检测前导信号。Step 2: The UE determines whether to detect the preamble signal according to the reception quality of the discovery signal; for example, if the reception quality of the signal is found to be good (the specific judgment standard can be set according to actual needs), accurate synchronization can be realized without further detecting the preamble signal. Then, the preamble signal is not detected, and only the preamble signal is used as a placeholder. If the reception quality of the signal is found to be poor, it is determined that the preamble signal needs to be detected.
步骤三:当确定需要检测前导信号时,UE开始检测前导信号,首先UE利用UE本地存储或者即时生成的preamble序列在接收信号中对preamble II或者preamble II的某个OFDM符号进行检测,若按照上述方案一,则是检测整个preamble II,若按照上述方案二,则是检测preamble II的第一个OFDM符号,若按照上述方案三,则是检测preamble II的第二个OFDM符号,此处的检测可以是相关检测。Step 3: When it is determined that the preamble signal needs to be detected, the UE starts to detect the preamble signal. First, the UE detects the OFDM symbol of the preamble II or the preamble II in the received signal by using the preamble sequence generated by the UE locally or generated in real time. In the first scheme, the entire preamble II is detected. If the second scheme is used, the first OFDM symbol of the preamble II is detected. If the third scheme is used, the second OFDM symbol of the preamble II is detected. Can be related detection.
进而,根据各种方案的实际情况,完成对preamble II的检测。若没有检测到preamble II,则说明最多存在preamble I,需要完全根据发现信号的同步方法完成时频同步。Further, the detection of the preamble II is completed according to the actual situation of various schemes. If the preamble II is not detected, it means that there is at most preamble I, and the time-frequency synchronization needs to be completed according to the synchronization method of the discovery signal.
步骤四:UE完成preamble II检测后,需要根据实际采用的前导方案(上述方案一、方案二或方案三),按照preamble III的结构,对是否存在preamble III进行检测;preamble II前面部分就是preamble I,preamble I用于占位,UE不用对进行识别。Step 4: After the UE completes the preamble II test, it needs to detect whether the preamble III exists according to the preamble III structure according to the actual preamble scheme (the first scheme, the second scheme or the third scheme); the front part of the preamble II is the preamble I. The preamble I is used for the placeholder, and the UE does not need to identify it.
步骤五:UE检测到前导信号后,结合前导信号的结构及UE发现信号接收的质量决定是否利用前导信号进行辅助同步,若需进行辅助同步,则利用前导信号进行辅助同步。Step 5: After detecting the preamble signal, the UE determines whether to use the preamble signal for auxiliary synchronization according to the structure of the preamble signal and the quality of the UE discovery signal reception. If auxiliary synchronization is needed, the preamble signal is used for auxiliary synchronization.
步骤六:UE检测到前导信号后,数据传输为不完整子帧时,利用前导信号确定数据传输的起始OFDM符号位置。Step 6: After the UE detects the preamble signal, when the data transmission is an incomplete subframe, the preamble signal is used to determine the starting OFDM symbol position of the data transmission.
与上述方法相对应的,参见图7,在基站侧,本申请实施例提供的一种前导信号的发送设备,包括:Corresponding to the foregoing method, referring to FIG. 7, on the base station side, a transmitting device for transmitting a preamble according to an embodiment of the present application includes:
前导信号确定单元11,用于当基站在非授权频谱上随机接入信道时,确定需要发送的前导信号;The preamble signal determining unit 11 is configured to determine, when the base station randomly accesses the channel on the unlicensed spectrum, the preamble signal that needs to be sent;
发送单元12,用于在所述非授权频谱上接入信道的全带宽或部分带宽上,将所述前导信号发送给用户设备UE。The sending unit 12 is configured to send the preamble signal to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
本设备中,在基站侧,当在非授权频谱上随机接入信道时,确定需要发送的前导信号,
在所述非授权频谱上接入信道的全带宽或部分带宽上,将所述前导信号发送给用户设备UE,从而通过前导信号实现LTE系统在非授权频谱上的占位,具体地,LTE-U基站接入信道的时间是随机的,或者既使接入时间为子帧的起始位置,但是基站并没有准备好发送数据,此时必须发送占位符,LTE-U基站通过前导信号来占位,使得前导信号可以辅助发现信号实现UE的同步等功能。进而可以实现LTE系统在非授权频谱上的工作。In the device, on the base station side, when the channel is randomly accessed on the unlicensed spectrum, the preamble signal to be transmitted is determined,
Transmitting the preamble signal to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so as to implement the LTE system occupying the unlicensed spectrum by using the preamble signal, specifically, LTE- The time at which the U base station accesses the channel is random, or the access time is the start position of the subframe, but the base station is not ready to transmit data, and the placeholder must be sent at this time, and the LTE-U base station uses the preamble signal to The placeholder enables the preamble signal to assist the discovery signal to implement functions such as synchronization of the UE. In turn, the LTE system can work on the unlicensed spectrum.
较佳地,所述前导信号的起始时刻为所述基站随机接入信道的时刻,所述前导信号的终止时刻在数据符号和控制信令的发送时刻之前。Preferably, the start time of the preamble signal is the time of the base station random access channel, and the termination time of the preamble signal is before the data symbol and the transmission time of the control signaling.
较佳地,所述前导信号为包括第一部分、第二部分和第三部分中的至少一个部分的前导信号,其中,第一部分的时间长度为非整数个正交频分复用OFDM符号长度,第二部分与第三部分的时间长度都是OFDM符号长度的整数倍。Preferably, the preamble signal is a preamble signal including at least one of the first part, the second part, and the third part, wherein the length of the first part is a non-integer number of orthogonal frequency division multiplexing OFDM symbol lengths, The length of time of the second part and the third part is an integer multiple of the length of the OFDM symbol.
较佳地,所述前导信号确定单元确定需要发送的前导信号时,具体用于:Preferably, when the preamble signal determining unit determines the preamble signal to be transmitted, it is specifically used to:
当可用资源不足一个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than one OFDM symbol, determining that the preamble signal to be transmitted includes only the first part;
当可用资源大于或等于一个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resource is greater than or equal to one OFDM symbol, it is determined that the preamble signal to be transmitted includes the second portion.
较佳地,当所述前导信号包括所述第二部分时,该第二部分由一个OFDM符号组成,该OFDM符号由循环前缀CP与两个周期序列组成。Preferably, when the preamble signal includes the second part, the second part is composed of one OFDM symbol, and the OFDM symbol is composed of a cyclic prefix CP and two periodic sequences.
较佳地,所述前导信号确定单元确定需要发送的前导信号时,具体用于:Preferably, when the preamble signal determining unit determines the preamble signal to be transmitted, it is specifically used to:
当可用资源不足两个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than two OFDM symbols, it is determined that the preamble signal to be transmitted only includes the first part;
当可用资源大于或等于两个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resources are greater than or equal to two OFDM symbols, it is determined that the preamble signal to be transmitted includes the second portion.
较佳地,当所述前导信号包括所述第二部分时,该第二部分由两个OFDM符号组成,其中每一OFDM符号分别对应一个第一循环前缀CP,或者,两个OFDM符号共用一个第二CP,第一CP的长度是第二CP的长度的一半。Preferably, when the preamble signal includes the second part, the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix CP, or two OFDM symbols share one The second CP, the length of the first CP is half of the length of the second CP.
较佳地,当可用资源大于或等于一个OFDM符号时,所述前导信号包括的所述第二部分由一个OFDM符号组成,该OFDM符号由一个循环前缀和两个周期序列组成;Preferably, when the available resource is greater than or equal to one OFDM symbol, the second part of the preamble signal is composed of one OFDM symbol, and the OFDM symbol is composed of one cyclic prefix and two periodic sequences;
当可用资源大于或等于两个OFDM符号时,所述前导信号包括的所述第二部分由两个OFDM符号组成,其中第一个OFDM符号由第一循环前缀CP和预设个数的第一周期序列组成,第二个OFDM符号由第二CP和两个第二周期序列组成。When the available resource is greater than or equal to two OFDM symbols, the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number The periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
较佳地,当所述前导信号还包括所述第一部分时,所述第一部分中的序列是基于所述第二部分中的序列生成的;Preferably, when the preamble signal further includes the first portion, the sequence in the first portion is generated based on a sequence in the second portion;
当所述前导信号还包括所述第三部分时,所述第三部分中的序列是基于所述第二部分中的序列生成的。When the preamble further includes the third portion, the sequence in the third portion is generated based on a sequence in the second portion.
较佳地,上述前导信号的发送设备可以是基站。Preferably, the transmitting device of the foregoing preamble signal may be a base station.
相应地,在UE侧,参见图8,本申请实施例提供的一种前导信号的接收设备,包括:Correspondingly, on the UE side, referring to FIG. 8, a receiving device for a preamble signal according to an embodiment of the present application includes:
初始同步单元21,用于利用发现信号进行初始同步;
An initial synchronization unit 21, configured to perform initial synchronization by using a discovery signal;
辅助同步单元22,用于当确定需要对前导信号进行检测时,对所述前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的。The auxiliary synchronization unit 22 is configured to: when determining that the preamble signal needs to be detected, detect the preamble signal and perform auxiliary synchronization by using the detected preamble signal, where the preamble signal is the base station accessing the unlicensed spectrum Transmitted on the full bandwidth or part of the bandwidth of the channel.
通过该设备,在UE侧,利用发现信号进行初始同步,并且UE当确定需要对前导信号进行检测时,对所述前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的,从而在UE侧,即使发现信号接收非常不好,也可以利用所述前导信号实现同步功能,UE可以检测出来这些前导信号,至于UE是否去检测这些前导信号,是否利用这些前导信号实现同步功能取决于UE对发现信号的接收情况,若发现信号接收良好,前导信号就是占位符,UE可以对前导信号忽视直接去解控制信令与数据就可以了。Through the device, on the UE side, the initial synchronization is performed by using the discovery signal, and when determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is The base station sends the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so that the UE can detect the preamble signal by using the preamble signal even if the signal reception is very bad. The preamble signal, whether the UE is to detect these preamble signals, whether to use these preamble signals to achieve synchronization function depends on the UE receiving the discovery signal. If the signal reception is found to be good, the preamble signal is a placeholder, and the UE can ignore the preamble signal directly. It is enough to solve the control signaling and data.
较佳地,所述辅助同步单元还用于:利用检测到的前导信号确定数据起始位置。Preferably, the auxiliary synchronization unit is further configured to: determine a data start position by using the detected preamble signal.
较佳地,所述辅助同步单元确定需要对前导信号进行检测时,具体用于:根据所述发现信号的接收质量确定需要对前导信号进行检测。Preferably, when the auxiliary synchronization unit determines that the preamble signal needs to be detected, it is specifically used to: determine that the preamble signal needs to be detected according to the reception quality of the discovery signal.
较佳地,所述辅助同步单元对所述前导信号进行检测时,具体用于:Preferably, when the auxiliary synchronization unit detects the preamble signal, it is specifically used to:
利用本地存储的或者即时生成的前导序列在接收信号中对前导信号的第二部分的整体进行检测,或者对前导信号的第二部分的第一个OFDM符号进行检测,或者对前导信号的第二部分的第二个OFDM符号进行检测;Detecting the entirety of the second portion of the preamble signal in the received signal using a locally stored or immediately generated preamble sequence, or detecting the first OFDM symbol of the second portion of the preamble signal, or second to the preamble signal Part of the second OFDM symbol is detected;
若检测不到前导信号的第二部分,则放弃检测前导信号;If the second part of the preamble signal is not detected, the detection of the preamble signal is abandoned;
若完成检测前导信号的第二部分,则进行前导信号的第三部分的检测。If the second portion of the detection preamble is completed, the detection of the third portion of the preamble is performed.
以上各单元均可以由处理器等实体装置实现。Each of the above units can be implemented by a physical device such as a processor.
较佳地,上述前导信号的接收设备可以是UE。Preferably, the receiving device of the foregoing preamble signal may be a UE.
参见图9,在基站侧,本申请实施例提供的一种前导信号的发送设备(该设备可以是基站),包括:Referring to FIG. 9, on the base station side, a sending device for a preamble signal (the device may be a base station) provided by the embodiment of the present application includes:
处理器500,用于读取存储器520中的程序,执行下列过程:The processor 500 is configured to read a program in the memory 520 and perform the following process:
当基站在非授权频谱上随机接入信道时,确定需要发送的前导信号;Determining a preamble signal to be transmitted when the base station randomly accesses the channel on the unlicensed spectrum;
在所述非授权频谱上接入信道的全带宽或部分带宽上,通过收发机510将所述前导信号发送给用户设备UE。The preamble signal is sent by the transceiver 510 to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
本设备中,在基站侧,当在非授权频谱上随机接入信道时,确定需要发送的前导信号,在所述非授权频谱上接入信道的全带宽或部分带宽上,将所述前导信号发送给用户设备UE,从而通过前导信号实现LTE系统在非授权频谱上的占位,具体地,LTE-U基站接入信道的时间是随机的,或者既使接入时间为子帧的起始位置,但是基站并没有准备好发送数据,此时必须发送占位符,LTE-U基站通过前导信号来占位,使得前导信号可以辅助发现信号实现UE的同步等功能。进而可以实现LTE系统在非授权频谱上的工作。
In the device, on the base station side, when the channel is randomly accessed on the unlicensed spectrum, the preamble signal to be transmitted is determined, and the preamble signal is used on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum. Sending to the user equipment UE, the LTE system is occupied by the preamble signal on the unlicensed spectrum. Specifically, the time for the LTE-U base station to access the channel is random, or the access time is the start of the subframe. Location, but the base station is not ready to send data. At this time, the placeholder must be sent. The LTE-U base station is occupied by the preamble signal, so that the preamble signal can assist the discovery signal to realize the synchronization of the UE. In turn, the LTE system can work on the unlicensed spectrum.
较佳地,所述前导信号的起始时刻为所述基站随机接入信道的时刻,所述前导信号的终止时刻在数据符号和控制信令的发送时刻之前。Preferably, the start time of the preamble signal is the time of the base station random access channel, and the termination time of the preamble signal is before the data symbol and the transmission time of the control signaling.
较佳地,所述前导信号为包括第一部分、第二部分和第三部分中的至少一个部分的前导信号,其中,第一部分的时间长度为非整数个正交频分复用OFDM符号长度,第二部分与第三部分的时间长度都是OFDM符号长度的整数倍。Preferably, the preamble signal is a preamble signal including at least one of the first part, the second part, and the third part, wherein the length of the first part is a non-integer number of orthogonal frequency division multiplexing OFDM symbol lengths, The length of time of the second part and the third part is an integer multiple of the length of the OFDM symbol.
较佳地,所述处理器500确定需要发送的前导信号时,具体用于:Preferably, when the processor 500 determines the preamble signal that needs to be sent, it is specifically used to:
当可用资源不足一个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than one OFDM symbol, determining that the preamble signal to be transmitted includes only the first part;
当可用资源大于或等于一个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resource is greater than or equal to one OFDM symbol, it is determined that the preamble signal to be transmitted includes the second portion.
较佳地,当所述前导信号包括所述第二部分时,该第二部分由一个OFDM符号组成,该OFDM符号由循环前缀CP与两个周期序列组成。Preferably, when the preamble signal includes the second part, the second part is composed of one OFDM symbol, and the OFDM symbol is composed of a cyclic prefix CP and two periodic sequences.
或者,处理器500确定需要发送的前导信号时,具体用于:Alternatively, when the processor 500 determines the preamble signal that needs to be transmitted, it is specifically used to:
当可用资源不足两个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than two OFDM symbols, it is determined that the preamble signal to be transmitted only includes the first part;
当可用资源大于或等于两个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resources are greater than or equal to two OFDM symbols, it is determined that the preamble signal to be transmitted includes the second portion.
较佳地,当所述前导信号包括所述第二部分时,该第二部分由两个OFDM符号组成,其中每一OFDM符号分别对应一个第一循环前缀CP,或者,两个OFDM符号共用一个第二CP,第一CP的长度是第二CP的长度的一半。Preferably, when the preamble signal includes the second part, the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix CP, or two OFDM symbols share one The second CP, the length of the first CP is half of the length of the second CP.
较佳地,当可用资源大于或等于一个OFDM符号时,所述前导信号包括的所述第二部分由一个OFDM符号组成,该OFDM符号由一个循环前缀和两个周期序列组成;Preferably, when the available resource is greater than or equal to one OFDM symbol, the second part of the preamble signal is composed of one OFDM symbol, and the OFDM symbol is composed of one cyclic prefix and two periodic sequences;
当可用资源大于或等于两个OFDM符号时,所述前导信号包括的所述第二部分由两个OFDM符号组成,其中第一个OFDM符号由第一循环前缀CP和预设个数的第一周期序列组成,第二个OFDM符号由第二CP和两个第二周期序列组成。When the available resource is greater than or equal to two OFDM symbols, the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number The periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
较佳地,当所述前导信号还包括所述第一部分时,所述第一部分中的序列是基于所述第二部分中的序列生成的;Preferably, when the preamble signal further includes the first portion, the sequence in the first portion is generated based on a sequence in the second portion;
当所述前导信号还包括所述第三部分时,所述第三部分中的序列是基于所述第二部分中的序列生成的。When the preamble further includes the third portion, the sequence in the third portion is generated based on a sequence in the second portion.
收发机510,用于在处理器500的控制下接收和发送相关信息数据。The transceiver 510 is configured to receive and transmit related information data under the control of the processor 500.
其中,在图7中,总线架构可以包括任意数量的互联的总线和桥,具体由处理器500代表的一个或多个处理器和存储器520代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起,这些都是本领域所公知的,因此,本文不再对其进行进一步描述。总线接口提供接口。收发机510可以是多个元件,即包括发送机和收发机,提供用于在传输介质上与各种其他装置通信的单元。Here, in FIG. 7, the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 500 and various circuits of memory represented by memory 520. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 510 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
处理器500负责管理总线架构和通常的处理,存储器520可以存储处理器500在执行
操作时所使用的数据。The processor 500 is responsible for managing the bus architecture and the usual processing, and the memory 520 can store the processor 500 for execution.
The data used during the operation.
相应地,在UE侧,参见图10,本申请实施例提供的一种前导信号的接收设备(该设备可以是UE),包括:Correspondingly, on the UE side, referring to FIG. 10, a receiving device (which may be a UE) of the preamble signal provided by the embodiment of the present application includes:
处理器600,用于读取存储器620中的程序,执行下列过程:The processor 600 is configured to read a program in the memory 620 and perform the following process:
利用通过收发机610接收到的发现信号进行初始同步;Initial synchronization is performed using the discovery signal received through the transceiver 610;
当确定需要对前导信号进行检测时,对所述通过收发机610接收到的前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的。When it is determined that the preamble signal needs to be detected, the preamble signal received by the transceiver 610 is detected and assisted synchronization is performed by using the detected preamble signal, wherein the preamble signal is the base station accessing the unlicensed spectrum. Transmitted on the full bandwidth or part of the bandwidth of the channel.
通过该设备,在UE侧,利用发现信号进行初始同步,并且UE当确定需要对前导信号进行检测时,对所述前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的,从而在UE侧,即使发现信号接收非常不好,也可以利用所述前导信号实现同步功能,UE可以检测出来这些前导信号,至于UE是否去检测这些前导信号,是否利用这些前导信号实现同步功能取决于UE对发现信号的接收情况,若发现信号接收良好,前导信号就是占位符,UE可以对前导信号忽视直接去解控制信令与数据就可以了。Through the device, on the UE side, the initial synchronization is performed by using the discovery signal, and when determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is The base station sends the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum, so that the UE can detect the preamble signal by using the preamble signal even if the signal reception is very bad. The preamble signal, whether the UE is to detect these preamble signals, whether to use these preamble signals to achieve synchronization function depends on the UE receiving the discovery signal. If the signal reception is found to be good, the preamble signal is a placeholder, and the UE can ignore the preamble signal directly. It is enough to solve the control signaling and data.
较佳地,所述处理器600还用于:利用检测到的前导信号确定数据起始位置。Preferably, the processor 600 is further configured to: determine a data start position by using the detected preamble signal.
较佳地,所述处理器600确定需要对前导信号进行检测时,具体用于:根据所述发现信号的接收质量确定需要对前导信号进行检测。Preferably, when the processor 600 determines that the preamble signal needs to be detected, it is specifically used to: determine that the preamble signal needs to be detected according to the reception quality of the discovery signal.
较佳地,所述处理器600对所述前导信号进行检测时,具体用于:Preferably, when the processor 600 detects the preamble signal, it is specifically used to:
利用本地存储的或者即时生成的前导序列在接收信号中对前导信号的第二部分的整体进行检测,或者对前导信号的第二部分的第一个OFDM符号进行检测,或者对前导信号的第二部分的第二个OFDM符号进行检测;Detecting the entirety of the second portion of the preamble signal in the received signal using a locally stored or immediately generated preamble sequence, or detecting the first OFDM symbol of the second portion of the preamble signal, or second to the preamble signal Part of the second OFDM symbol is detected;
若检测不到前导信号的第二部分,则放弃检测前导信号;If the second part of the preamble signal is not detected, the detection of the preamble signal is abandoned;
若完成检测前导信号的第二部分,则进行前导信号的第三部分的检测。If the second portion of the detection preamble is completed, the detection of the third portion of the preamble is performed.
以上各单元均可以由处理器等实体装置实现。Each of the above units can be implemented by a physical device such as a processor.
收发机610,用于在处理器600的控制下接收和发送相关信息数据。The transceiver 610 is configured to receive and transmit related information data under the control of the processor 600.
其中,在图8中,总线架构可以包括任意数量的互联的总线和桥,具体由处理器600代表的一个或多个处理器和存储器620代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起,这些都是本领域所公知的,因此,本文不再对其进行进一步描述。总线接口提供接口。收发机610可以是多个元件,即包括发送机和接收机,提供用于在传输介质上与各种其他装置通信的单元。针对不同的用户设备,用户接口630还可以是能够外接内接需要设备的接口,连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。
Here, in FIG. 8, the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 600 and various circuits of memory represented by memory 620. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 610 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. For different user equipments, the user interface 630 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
处理器600负责管理总线架构和通常的处理,存储器620可以存储处理器600在执行操作时所使用的数据。The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 can store data used by the processor 600 in performing operations.
综上所述,本申请实施例中,LTE-U基站接入信道的时间是随机的,或者既使接入时间是子帧的起始位置,但是基站并没有准备好发送数据,此时必须发送占位符,本申请实施例通过恰当的设计前导信号来实现占位,使得其可以辅助发现信号实现同步等功能。In summary, in the embodiment of the present application, the time for the LTE-U base station to access the channel is random, or the access time is the starting position of the subframe, but the base station is not ready to send data, and The placeholder is sent. The embodiment of the present application implements the placeholder by appropriately designing the preamble signal, so that it can assist the discovery signal to achieve synchronization and the like.
占位信号的特征分为两个部分,一部分是非整数个OFDM符号,另一部分是整数个OFDM符号,其结束的位置取决于基站的配置,若不完整子帧不传数据,占位符结束位置为下一个子帧之前,若不完整子帧传输数据,占位信号结束位置是基站配置的接入时刻所处子帧的某个OFDM符号。占位信号可以是任意的结构,既然占位符是必须的,可以通过恰当设计占位符的结构使得前导信号与传输方案一、二、三都具有可以辅助同步的功能,在方案一中发挥同步作用的终点为占一个OFDM符号的preamble II,preamble I只起占位功能,别无他用,preamble III要根据实际需要占位的OFDM符号数,由基站决定是否存在有多少符号,都可以被检测出来,若preamble III也存在,preamble II与preamble III联合在一起可以使得同步估计更加精确。方案二与方案一原理是一样的只是将方案一中preamble II换成了两个OFDM符号,因为换成两个OFDM符号也是可以的,可以获得更好的同步估计精度,但是preamble II至少需要两个OFDM符号,开销较大;方案三中重点也是preamble II的前一个符号可以实现粗同步,后一个符号可以实现精同步,但是它的结构很灵活,在占位符需要的符号较少时,可以只配置其第二个OFDM符号实现精同步,在占位符符号很多时,可以由preamble II的第一个符号实现粗同步,这种情形下,发现信号就被替代了,即使发现信号接收非常不好,也可以利用其实现同步功能,UE可以检测出来这些前导信号,至于UE是否去检测,是否利用其实现同步功能取决于UE对发现信号的接收情况,若发现信号接收良好,前导信号就是占位符,UE还是按照LTE-U的方案设计,对前导忽视直接去解控制信令与数据就可以了。The feature of the placeholder signal is divided into two parts, one part is a non-integer number of OFDM symbols, and the other part is an integer number of OFDM symbols, and the ending position depends on the configuration of the base station. If the incomplete subframe does not transmit data, the placeholder end position Before the next subframe, if the data is transmitted in an incomplete subframe, the end position of the place signal is an OFDM symbol of the subframe in which the access time configured by the base station is located. The placeholder signal can be of any structure. Since the placeholder is necessary, the structure of the placeholder can be properly designed so that the preamble signal and the transmission schemes one, two, and three have the function of assisting synchronization, and play in the first scheme. The end point of the synchronization action is the preamble II of one OFDM symbol. The preamble I only has a placeholder function, and there is no other use. The preamble III needs to count the number of OFDM symbols occupied by the actual needs, and the base station determines whether there are any symbols or not. It is detected that if the preamble III is also present, the preamble II combined with the preamble III can make the synchronization estimation more accurate. The second scheme is the same as the scheme one, except that the preamble II in scheme 1 is replaced by two OFDM symbols, because it is also possible to switch to two OFDM symbols, and better synchronization estimation accuracy can be obtained, but the preamble II needs at least two. OFDM symbols, the overhead is large; the focus of the third scheme is that the preamble II's previous symbol can achieve coarse synchronization, the latter symbol can achieve fine synchronization, but its structure is very flexible, when the number of symbols required by the placeholder is small, Fine synchronization can be implemented only by configuring its second OFDM symbol. When there are many placeholder symbols, coarse synchronization can be implemented by the first symbol of preamble II. In this case, the discovery signal is replaced even if signal reception is found. Very bad, can also use it to achieve synchronization function, the UE can detect these preamble signals, as to whether the UE is to detect, whether to use it to achieve synchronization function depends on the UE receiving the discovery signal, if the signal is found to be good, the preamble signal It is a placeholder, and the UE is designed according to the LTE-U scheme. It ignores the direct control of the signaling and data for the preamble. To the.
总之,本申请实施例提出一种新型的前导信号的传输方法和设备,在前导信号发挥占位功能的同时可以辅助同步,辅助识别数据传输的起始位置,而现有技术还没有给出占位符的具体实现方案。In summary, the embodiment of the present application proposes a novel transmission method and device for a preamble signal, which can assist in synchronization while the preamble signal plays a role of occupying a bit, and assists in identifying the starting position of data transmission, but the prior art has not yet given The specific implementation of the bit.
本领域内的技术人员应明白,本申请的实施例可提供为方法、系统、或计算机程序产品。因此,本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且,本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware. Moreover, the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流
程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It should be understood that each flow in the flowchart and/or block diagram can be implemented by computer program instructions.
Combinations of blocks and/or blocks, and flow diagrams and/or blocks in the flowcharts and/or block diagrams. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
显然,本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样,倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内,则本申请也意图包含这些改动和变型在内。
It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.
Claims (26)
- 一种前导信号的发送方法,其特征在于,该方法包括:A method for transmitting a preamble signal, the method comprising:基站当在非授权频谱上随机接入信道时,确定需要发送的前导信号;The base station determines a preamble signal to be transmitted when randomly accessing the channel on the unlicensed spectrum;所述基站在所述非授权频谱上接入信道的全带宽或部分带宽上,将所述前导信号发送给用户设备UE。The base station sends the preamble signal to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
- 根据权利要求1所述的方法,其特征在于,所述前导信号的起始时刻为所述基站随机接入信道的时刻,所述前导信号的终止时刻在数据符号和控制信令的发送时刻之前。The method according to claim 1, wherein a start time of the preamble signal is a time of the base station random access channel, and a termination time of the preamble signal is before a data symbol and a control signal transmission time .
- 根据权利要求1所述的方法,其特征在于,所述前导信号为包括第一部分、第二部分和第三部分中的至少一个部分的前导信号,其中,第一部分的时间长度为非整数个正交频分复用OFDM符号长度,第二部分与第三部分的时间长度都是OFDM符号长度的整数倍。The method according to claim 1, wherein said preamble signal is a preamble signal including at least one of a first portion, a second portion, and a third portion, wherein a length of time of the first portion is a non-integer number of positive The frequency division is divided into OFDM symbol lengths, and the lengths of the second part and the third part are integer multiples of the OFDM symbol length.
- 根据权利要求3所述的方法,其特征在于,确定需要发送的前导信号,包括:The method according to claim 3, wherein determining the preamble signal to be transmitted comprises:当可用资源不足一个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than one OFDM symbol, determining that the preamble signal to be transmitted includes only the first part;当可用资源大于或等于一个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resource is greater than or equal to one OFDM symbol, it is determined that the preamble signal to be transmitted includes the second portion.
- 根据权利要求4所述的方法,其特征在于,当所述前导信号包括所述第二部分时,该第二部分由一个OFDM符号组成,该OFDM符号由循环前缀CP与两个周期序列组成。The method according to claim 4, wherein when said preamble signal comprises said second portion, said second portion consists of an OFDM symbol consisting of a cyclic prefix CP and two periodic sequences.
- 根据权利要求3所述的方法,其特征在于,确定需要发送的前导信号,包括:The method according to claim 3, wherein determining the preamble signal to be transmitted comprises:当可用资源不足两个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than two OFDM symbols, it is determined that the preamble signal to be transmitted only includes the first part;当可用资源大于或等于两个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resources are greater than or equal to two OFDM symbols, it is determined that the preamble signal to be transmitted includes the second portion.
- 根据权利要求6所述的方法,其特征在于,当所述前导信号包括所述第二部分时,该第二部分由两个OFDM符号组成,其中每一OFDM符号分别对应一个第一循环前缀CP,或者,两个OFDM符号共用一个第二CP,第一CP的长度是第二CP的长度的一半。The method according to claim 6, wherein when the preamble signal comprises the second part, the second part is composed of two OFDM symbols, wherein each OFDM symbol respectively corresponds to a first cyclic prefix CP Or, the two OFDM symbols share a second CP, and the length of the first CP is half of the length of the second CP.
- 根据权利要求4所述的方法,其特征在于,当可用资源大于或等于一个OFDM符号时,所述前导信号包括的所述第二部分由一个OFDM符号组成,该OFDM符号由一个循环前缀和两个周期序列组成;The method according to claim 4, wherein when the available resource is greater than or equal to one OFDM symbol, the second portion of the preamble signal is composed of one OFDM symbol, the OFDM symbol consists of a cyclic prefix and two Periodic sequence composition;当可用资源大于或等于两个OFDM符号时,所述前导信号包括的所述第二部分由两个OFDM符号组成,其中第一个OFDM符号由第一循环前缀CP和预设个数的第一周期序列组成,第二个OFDM符号由第二CP和两个第二周期序列组成。When the available resource is greater than or equal to two OFDM symbols, the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number The periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
- 根据权利要求5、7或8所述的方法,其特征在于,当所述前导信号还包括所述第一部分时,所述第一部分中的序列是基于所述第二部分中的序列生成的;The method according to claim 5, 7 or 8, wherein when said preamble further comprises said first portion, said sequence in said first portion is generated based on a sequence in said second portion;当所述前导信号还包括所述第三部分时,所述第三部分中的序列是基于所述第二部分 中的序列生成的。When the preamble further includes the third portion, the sequence in the third portion is based on the second portion The sequence generated in .
- 一种前导信号的接收方法,其特征在于,该方法包括:A method for receiving a preamble signal, the method comprising:用户设备UE利用发现信号进行初始同步;The user equipment UE performs initial synchronization by using the discovery signal;所述UE当确定需要对前导信号进行检测时,对所述前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的。When determining that the preamble signal needs to be detected, the UE detects the preamble signal and performs auxiliary synchronization by using the detected preamble signal, where the preamble signal is a full bandwidth of the base station accessing the channel on the unlicensed spectrum. Or sent on part of the bandwidth.
- 根据权利要求10所述的方法,其特征在于,该方法还包括:The method of claim 10, further comprising:所述UE利用检测到的前导信号确定数据起始位置。The UE determines the data start position using the detected preamble signal.
- 根据权利要求10或11所述的方法,其特征在于,所述UE确定需要对前导信号进行检测,包括:所述UE根据所述发现信号的接收质量确定需要对前导信号进行检测。The method according to claim 10 or 11, wherein the UE determines that the preamble signal needs to be detected, and the UE determines that the preamble signal needs to be detected according to the reception quality of the discovery signal.
- 根据权利要求10所述的方法,其特征在于,所述UE对所述前导信号进行检测,包括:The method according to claim 10, wherein the detecting, by the UE, the preamble signal comprises:所述UE利用本地存储的或者即时生成的前导序列在接收信号中对前导信号的第二部分的整体进行检测,或者对前导信号的第二部分的第一个OFDM符号进行检测,或者对前导信号的第二部分的第二个OFDM符号进行检测;The UE detects the entirety of the second part of the preamble signal in the received signal by using the locally stored or immediately generated preamble sequence, or detects the first OFDM symbol of the second part of the preamble signal, or the preamble signal The second OFDM symbol of the second part is detected;若检测不到前导信号的第二部分,则所述UE放弃检测前导信号;If the second part of the preamble signal is not detected, the UE abandons the detection of the preamble signal;若完成检测前导信号的第二部分,则所述UE进行前导信号的第三部分的检测。If the second portion of the preamble signal is detected, the UE performs detection of the third portion of the preamble signal.
- 一种前导信号的发送设备,其特征在于,该设备包括:A transmitting device for a preamble signal, characterized in that the device comprises:前导信号确定单元,用于当基站在非授权频谱上随机接入信道时,确定需要发送的前导信号;a preamble signal determining unit, configured to determine a preamble signal to be transmitted when the base station randomly accesses the channel on the unlicensed spectrum;发送单元,用于在所述非授权频谱上接入信道的全带宽或部分带宽上,将所述前导信号发送给用户设备UE。And a sending unit, configured to send the preamble signal to the user equipment UE on the full bandwidth or part of the bandwidth of the access channel on the unlicensed spectrum.
- 根据权利要求14所述的设备,其特征在于,所述前导信号的起始时刻为所述基站随机接入信道的时刻,所述前导信号的终止时刻在数据符号和控制信令的发送时刻之前。The device according to claim 14, wherein a start time of the preamble signal is a time of the base station random access channel, and a termination time of the preamble signal is before a data symbol and a control signal transmission time .
- 根据权利要求14所述的设备,其特征在于,所述前导信号为包括第一部分、第二部分和第三部分中的至少一个部分的前导信号,其中,第一部分的时间长度为非整数个正交频分复用OFDM符号长度,第二部分与第三部分的时间长度都是OFDM符号长度的整数倍。The apparatus according to claim 14, wherein said preamble signal is a preamble signal including at least one of a first portion, a second portion, and a third portion, wherein a length of time of said first portion is a non-integer number of positive The frequency division is divided into OFDM symbol lengths, and the lengths of the second part and the third part are integer multiples of the OFDM symbol length.
- 根据权利要求16所述的设备,其特征在于,所述前导信号确定单元确定需要发送的前导信号时,具体用于:The device according to claim 16, wherein when the preamble determining unit determines the preamble signal to be transmitted, it is specifically used to:当可用资源不足一个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than one OFDM symbol, determining that the preamble signal to be transmitted includes only the first part;当可用资源大于或等于一个OFDM符号时,确定需要发送的前导信号包括第二部分。 When the available resource is greater than or equal to one OFDM symbol, it is determined that the preamble signal to be transmitted includes the second portion.
- 根据权利要求17所述的设备,其特征在于,当所述前导信号包括所述第二部分时,该第二部分由一个OFDM符号组成,该OFDM符号由循环前缀CP与两个周期序列组成。The apparatus according to claim 17, wherein when said preamble signal comprises said second portion, said second portion consists of an OFDM symbol consisting of a cyclic prefix CP and two periodic sequences.
- 根据权利要求16所述的设备,其特征在于,所述前导信号确定单元确定需要发送的前导信号时,具体用于:The device according to claim 16, wherein when the preamble determining unit determines the preamble signal to be transmitted, it is specifically used to:当可用资源不足两个OFDM符号时,确定需要发送的前导信号仅包括第一部分;When the available resources are less than two OFDM symbols, it is determined that the preamble signal to be transmitted only includes the first part;当可用资源大于或等于两个OFDM符号时,确定需要发送的前导信号包括第二部分。When the available resources are greater than or equal to two OFDM symbols, it is determined that the preamble signal to be transmitted includes the second portion.
- 根据权利要求19所述的设备,其特征在于,当所述前导信号包括所述第二部分时,该第二部分由两个OFDM符号组成,其中每一OFDM符号分别对应一个第一循环前缀CP,或者,两个OFDM符号共用一个第二CP,第一CP的长度是第二CP的长度的一半。The apparatus according to claim 19, wherein when said preamble signal comprises said second portion, said second portion is composed of two OFDM symbols, wherein each OFDM symbol corresponds to a first cyclic prefix CP Or, the two OFDM symbols share a second CP, and the length of the first CP is half of the length of the second CP.
- 根据权利要求17所述的设备,其特征在于,当可用资源大于或等于一个OFDM符号时,所述前导信号包括的所述第二部分由一个OFDM符号组成,该OFDM符号由一个循环前缀和两个周期序列组成;The apparatus according to claim 17, wherein when the available resource is greater than or equal to one OFDM symbol, the second portion of the preamble signal comprises an OFDM symbol consisting of a cyclic prefix and two Periodic sequence composition;当可用资源大于或等于两个OFDM符号时,所述前导信号包括的所述第二部分由两个OFDM符号组成,其中第一个OFDM符号由第一循环前缀CP和预设个数的第一周期序列组成,第二个OFDM符号由第二CP和两个第二周期序列组成。When the available resource is greater than or equal to two OFDM symbols, the second portion of the preamble signal is composed of two OFDM symbols, wherein the first OFDM symbol is composed of a first cyclic prefix CP and a preset number The periodic sequence consists of a second OFDM symbol consisting of a second CP and two second periodic sequences.
- 根据权利要求18、20或21所述的设备,其特征在于,当所述前导信号还包括所述第一部分时,所述第一部分中的序列是基于所述第二部分中的序列生成的;The apparatus according to claim 18, 20 or 21, wherein when said preamble further comprises said first portion, said sequence in said first portion is generated based on a sequence in said second portion;当所述前导信号还包括所述第三部分时,所述第三部分中的序列是基于所述第二部分中的序列生成的。When the preamble further includes the third portion, the sequence in the third portion is generated based on a sequence in the second portion.
- 一种前导信号的接收设备,其特征在于,该设备包括:A receiving device for a preamble signal, characterized in that the device comprises:初始同步单元,用于利用发现信号进行初始同步;An initial synchronization unit for initial synchronization using the discovery signal;辅助同步单元,用于当确定需要对前导信号进行检测时,对所述前导信号进行检测并利用检测到的前导信号进行辅助同步,其中该前导信号是所述基站在非授权频谱上接入信道的全带宽或部分带宽上发送的。An auxiliary synchronization unit, configured to detect the preamble signal and perform auxiliary synchronization by using the detected preamble signal when determining that the preamble signal needs to be detected, wherein the preamble signal is that the base station accesses the channel on the unlicensed spectrum Transmitted on full bandwidth or part of the bandwidth.
- 根据权利要求23所述的设备,其特征在于,所述辅助同步单元还用于:利用检测到的前导信号确定数据起始位置。The device according to claim 23, wherein the auxiliary synchronization unit is further configured to: determine a data start position by using the detected preamble signal.
- 根据权利要求23或24所述的设备,其特征在于,所述辅助同步单元确定需要对前导信号进行检测时,具体用于:根据所述发现信号的接收质量确定需要对前导信号进行检测。The device according to claim 23 or 24, wherein the auxiliary synchronization unit determines that the preamble signal needs to be detected, and is specifically configured to: determine that the preamble signal needs to be detected according to the reception quality of the discovery signal.
- 根据权利要求23所述的设备,其特征在于,所述辅助同步单元对所述前导信号进行检测时,具体用于: The device according to claim 23, wherein when the auxiliary synchronization unit detects the preamble signal, specifically:利用本地存储的或者即时生成的前导序列在接收信号中对前导信号的第二部分的整体进行检测,或者对前导信号的第二部分的第一个OFDM符号进行检测,或者对前导信号的第二部分的第二个OFDM符号进行检测;Detecting the entirety of the second portion of the preamble signal in the received signal using a locally stored or immediately generated preamble sequence, or detecting the first OFDM symbol of the second portion of the preamble signal, or second to the preamble signal Part of the second OFDM symbol is detected;若检测不到前导信号的第二部分,则放弃检测前导信号;If the second part of the preamble signal is not detected, the detection of the preamble signal is abandoned;若完成检测前导信号的第二部分,则进行前导信号的第三部分的检测。 If the second portion of the detection preamble is completed, the detection of the third portion of the preamble is performed.
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US10616845B2 (en) * | 2016-10-13 | 2020-04-07 | Qualcomm Incorporated | Coordinated resource discovery |
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