CN107786314B - Method and device in wireless communication - Google Patents
Method and device in wireless communication Download PDFInfo
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- CN107786314B CN107786314B CN201610744473.1A CN201610744473A CN107786314B CN 107786314 B CN107786314 B CN 107786314B CN 201610744473 A CN201610744473 A CN 201610744473A CN 107786314 B CN107786314 B CN 107786314B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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Abstract
The invention discloses a method and a device in wireless communication. The base station transmits a first wireless signal on a first frequency domain resource in a first time window. Wherein the first wireless signal is generated by a first sequence, the first wireless signal being used to determine a first base sequence. The first base sequence is used to generate a first reference sequence. The first time window comprises X1 time intervals, and the time length of the X1 time intervals is configurable. The first wireless signal is generated from X1 subsequences in the X1 time intervals, respectively. The X1 subsequences correspond to the X1 subsequences one-to-one. And the correlation between the sequence formed by the elements in the middle of any two adjacent subsequences and the sequence formed by the elements at the corresponding position in the first reference sequence is less than 1. The method disclosed by the invention can reduce the complexity of the synchronization of the user equipment and keep good autocorrelation and cross correlation of the synchronization signal.
Description
Technical Field
The present invention relates to a transmission scheme in a wireless communication system supporting multiple mathematical structures (Numerology), and more particularly, to a method and apparatus for synchronization signal transmission.
Background
In the future, the application scenes of the wireless communication system are more and more diversified, and different application scenes put different performance requirements on the system. In order to meet different performance requirements of various application scenarios, research on a New air interface technology (NR, New Radio) is decided in #72 global meetings of 3GPP (3rd Generation partnership project) RAN (Radio Access Network).
In order to be able to flexibly adapt to various application scenarios, future wireless communication systems, in particular NR, may support various mathematical structures (Numerology), which refers to various subcarrier spacings, various symbol time lengths, various CP (Cyclic Prefix) lengths, and so on. In order to simplify the complexity of system design and user equipment implementation, the physical layer design of the whole system can preferably adopt a unified structure aiming at different mathematical structures.
Disclosure of Invention
In a wireless communication system, a User Equipment (UE) needs to detect a base station and synchronize with the base station in time and frequency before subsequent operations can be performed. The signal detection and the time and frequency synchronization are completed by the synchronous signal, and meanwhile, according to different designs, the synchronous signal can also be used for indicating information such as cell identification, TRP (responsive reception Point) identification, antenna port identification, beam identification, FDD/TDD distinction, subframe/wireless frame timing and the like. The introduction of various different mathematical structures may cause various different synchronization signal waveforms, but since the user equipment does not know any mathematical structure configuration information before synchronization, in order to be able to detect signals and synchronize with the base station equipment in time and frequency, the user equipment needs to perform a large number of blind detections on synchronization signals of different mathematical structures, which may greatly increase the complexity and cost of the user equipment, and may also cause the complexity of system design.
The invention provides a solution to the problem that a plurality of different mathematical structures result in a plurality of different synchronization signal waveforms. By adopting the solution of the invention, the synchronous signals generated by the base station have nearly the same waveform structure under different mathematical structures, so that the user equipment only needs to carry out signal detection and time frequency synchronization aiming at one synchronous signal waveform, thereby greatly reducing the complexity of the user equipment. It should be noted that, without conflict, the embodiments and features in the embodiments in the UE (user equipment) of the present application may be applied to the base station, and vice versa. Further, the embodiments and features of the embodiments of the present application may be arbitrarily combined with each other without conflict.
The invention discloses a method used in a synchronous base station, which comprises the following steps:
-step a. transmitting a first wireless signal on a first frequency domain resource in a first time window.
Wherein the first wireless signal is generated by a first sequence, the first wireless signal being used to determine a first base sequence. The first base sequence is used to generate a first reference sequence. The length of the first sequence is equal to the length of the first reference sequence. The first time window comprises X1 time intervals, the X1 is a positive integer, and the time length of the X1 time intervals is configurable and is related to subcarrier spacing. The portions of the first wireless signal in the X1 time intervals are generated by X1 subsequences, respectively. The positions of the X1 sub-sequences in the first sequence are respectively in one-to-one correspondence with the positions of X1 sub-reference sequences in the first reference sequence, and the correlation between the sub-sequences and the corresponding sub-reference sequences is 1. And the correlation between the sequence formed by the elements in the middle of any two adjacent subsequences in the first sequence and the sequence formed by the elements at the corresponding position in the first reference sequence is less than 1.
As an embodiment, based on the time length of X1 time intervals and the configuration of subcarrier intervals, the first wireless signal maintains nearly the same waveform, and the existence of the element between any two adjacent subsequences does not destroy the good autocorrelation and cross correlation of the first base sequence, thereby ensuring the synchronization performance.
As an example, the length of the sequence refers to: the number of elements in the sequence.
As an example, the correlation of two sequences refers to the degree of correlation between corresponding elements of the two sequences. As a sub-embodiment, the correlation of two sequences being 1 means that the corresponding elements in the two sequences are fully correlated; as another sub-embodiment, said correlation of two sequences being less than 1 means that the presence of two mutually corresponding elements is independent.
As an example, the correlation of two sequences a (0), a (1), a (2), …, a (u) and b (0), b (1), b (2), …, b (u) is accomplished by the following formula:
wherein R (a, b) represents a correlation function of the sequence a and the sequence b, and U is an integer greater than or equal to 0.
As an example, the correlation of two sequences a (0), a (1), a (2), …, a (u) and b (0), b (1), b (2), …, b (u) is accomplished by the following formula:
wherein R (a, b) represents the correlation function of sequence a and sequence b, U is an integer greater than or equal to 0, and ⊙ symbols represent an exclusive OR operation.
In one embodiment, the first base sequence is a complex sequence.
As an embodiment, the first base sequence is a real sequence.
As an embodiment, the first base sequence is a ZC (Zadoff-Chu) sequence.
As an embodiment, the first base sequence is a ZC sequence that is obtained by cutting.
As an embodiment, the first base sequence is a ZC sequence that is obtained by complementing 0.
As an embodiment, the first base sequence is a ZC sequence that is cyclically extended.
As an embodiment, the first base sequence is a ZC sequence that is cyclically shifted.
As an embodiment, the first base sequence is a ZC sequence that is cyclically extended and cyclically shifted.
As an embodiment, the first base sequence is a ZC sequence of length 63.
As an embodiment, the first base sequence is an m-sequence.
As an embodiment, the first base sequence is a sequence obtained by cyclic shifting an m-sequence.
As an embodiment, the first base sequence is a sequence obtained by scrambling an m-sequence.
As an embodiment, the first base sequence is a sequence obtained by scrambling an m-sequence through cyclic shift.
As an embodiment, the first base sequence is the same as the first reference sequence.
As an embodiment, the correlation of the first base sequence with the first reference sequence is 1.
As an embodiment, the correlation of the first base sequence with the first reference sequence is 0.
As an embodiment, the length of the first base sequence is the same as the length of the first reference sequence.
As an embodiment, the length of the first base sequence is different from the length of the first reference sequence.
As an embodiment, any two of the X1 time intervals are discontinuous.
As one embodiment, any two of the X1 time intervals are orthogonal (i.e., do not overlap) in the time domain.
As an example, the time lengths of the X1 time intervals are the same.
As an example, the length of time that two time intervals of the X1 time intervals exist is different.
As an embodiment, any 1 time interval of the X1 time intervals is 1 OFDM symbol, and the OFDM symbol includes a basic symbol and a CP.
As an embodiment, all of the X1 time intervals are the same subcarrier spacing in the first frequency-domain resource.
As an embodiment, two time intervals of the X1 time intervals are different in subcarrier spacing in the first frequency-domain resource.
As an embodiment, the time length of at least one of the X1 time intervals and the subcarrier spacing are linearly inversely proportional.
As an example, the subcarrier spacing for any of the X1 time intervals is P times 3.75kHz, where P is a non-negative integer power of 2.
For one embodiment, the first frequency-domain resource includes a DC (Direct Current) subcarrier.
As one embodiment, the first wireless signal is a Primary Synchronization Signal (PSS).
As one embodiment, the first wireless signal is a Secondary Synchronization Signal (SSS).
Specifically, according to an aspect of the present invention, the method is characterized in that the step a further includes the steps of:
step A0. sends the first signaling.
Wherein the first signaling is used to determine at least one of { the length in time of the X1 time intervals, the subcarrier spacing of the X1 time intervals }.
As an embodiment, the first signaling is higher layer signaling.
As an embodiment, the first signaling is physical layer signaling.
As an embodiment, the first signaling is physical layer signaling, and the first signaling includes scheduling information of the first wireless signal, where the scheduling information includes at least one of { occupied time-frequency resource, MCS, RV, NDI, HARQ process number }.
As an embodiment, the first signaling explicitly indicates at least one of { a time length of the X1 time intervals, a subcarrier spacing of the X1 time intervals }. .
As an embodiment, the first signaling comprises a default configuration of the time length of the X1 time intervals.
As an embodiment, the first signaling comprises a default configuration of subcarrier spacing for the X1 time intervals.
As an embodiment, the first signaling implicitly indicates at least one of { the length in time of the X1 time intervals, the subcarrier spacing of the X1 time intervals }.
Specifically, according to an aspect of the present invention, the method is characterized in that the step a further includes the steps of:
-a step a1. generating the first reference sequence.
Wherein { at least one of a time-domain position of the first time window, a frequency-domain position of the first frequency-domain resource, a first identity } is used to generate the first base sequence, the first base sequence is oversampled by a factor of Q to generate the first reference sequence, the Q being a positive integer; or the first base sequence generates the first reference sequence through cyclic shift. The first identifier is an integer, and the first identifier includes at least one of { a cell identifier for transmitting the first wireless signal, a TRP group identifier for transmitting the first wireless signal, and a beam identifier for transmitting the first wireless signal }.
As an example, said Q-fold oversampling of the sequence refers to: each element in the sequence is expanded by a factor of Q to form a new sequence of length Q.
As an embodiment, Q is equal to 1, i.e. the first base sequence is identical to the first reference sequence.
As a sub-embodiment of the above-mentioned embodiment, at least one of { the time domain position of the first time window, the frequency domain position of the first frequency domain resource } is used for determining the relationship of the first reference sequence and the first base sequence.
As an embodiment, the cell identity of the first wireless signal is a PCID.
As an embodiment, the time domain position of the first time window is the time domain position of the first time window in one Subframe (Subframe).
As an embodiment, the time domain position of the first time window is a time domain position of the first time window in a Radio Frame (Radio Frame).
As an embodiment, the Time domain position of the first Time window is a Time domain position of the first Time window in one Time Slot (Time Slot).
As an embodiment, the time domain position of the first time window is a time domain position of the first time window in a superframe (Hyper Frame).
As an embodiment, the frequency domain location of the first frequency domain resource is a frequency domain location of the first frequency domain resource in an entire system bandwidth.
As an embodiment, the frequency domain position of the first frequency domain resource is a frequency domain position of the first frequency domain resource in one same subcarrier spacing group.
As an embodiment, the frequency domain location of the first frequency domain resource is a frequency offset of the first frequency domain resource from a Channel grating (Channel Raster).
Specifically, according to an aspect of the present invention, the method is characterized in that the generating the first reference sequence by performing Q-fold oversampling on the first base sequence is: the first base sequence generates a third sequence through transform precoding and sequence spreading, the third sequence generates the first reference sequence through inverse transform precoding, wherein the length of the third sequence is the same as the length of the first reference sequence, the length of the third sequence is Q times of the length of the first base sequence, and the inverse transform precoding is an inverse operation of the transform precoding.
As an embodiment, generating the first reference sequence through the transform precoding and the inverse transform precoding may effectively maintain good autocorrelation and cross-correlation of the first base sequence.
As an embodiment, the Transform pre-coding is DFT (Discrete Fourier Transform) or FFT (Fast Fourier Transform).
As an embodiment, the inverse transform precoding is idft (inverse Discrete Fourier transform) or ifft (inverse Fast Fourier transform).
As an embodiment, the sequence spreading refers to spreading a sequence by complementing 0 at both ends.
As an embodiment, the sequence spreading means that the sequence is spread by cyclically repeating elements in the sequence.
Specifically, according to an aspect of the present invention, the method is characterized in that the step a further includes the steps of:
-a step a2. determining the position of the X1 time intervals in the first time window.
Wherein the first time window is reserved for X1 wideband modulation symbols in sequence in the time domain; or the first time window is reserved for a first basic symbol and X2 wideband modulation symbols in sequence in time domain, wherein the X2 is the X1 minus 1, the wideband modulation symbols include basic symbols and corresponding CPs in time domain, and the time length of each basic symbol and the time length of the corresponding CP in the first time window are configurable and related to the subcarrier spacing of the basic symbol.
As an embodiment, the time lengths of the different said basic symbols do not substantially affect the time domain waveform of the first wireless signal.
As an embodiment, the CP corresponding to the first one of the basic symbols is transmitted outside the X1 time intervals.
As an embodiment, the CP (Cyclic Prefix) is formed by moving a tail of a time domain sampling point of a corresponding basic symbol to be before the corresponding basic symbol.
Specifically, according to an aspect of the present invention, the above method is characterized in that the X1 subsequences are sequentially subjected to transform precoding at the X1 time intervals to generate X1 frequency domain subsequences, and the X1 frequency domain subsequences are sequentially subjected to OFDM-based modulation at the X1 time intervals to generate X1 basic symbols in the X1 time intervals.
As an embodiment, the OFDM based modulation does not include adding a CP.
As an embodiment, the OFDM based modulation is achieved by inverse transform precoding.
As an embodiment, the OFDM based modulation is implemented by IFFT.
As one embodiment, the OFDM-based modulation includes serial-to-parallel conversion of sequences.
As one embodiment, the OFDM based modulation includes time domain filtering.
As one embodiment, the OFDM based modulation includes frequency domain filtering.
For one embodiment, the OFDM-based modulation includes Windowing (Windowing).
Specifically, according to an aspect of the present invention, the method is characterized in that the step a further includes the steps of:
-a step a3. generating a second sequence
Wherein the second sequence is subjected to the inverse transform precoding to generate the first reference sequence, and at least one of { the time domain position of the first time window, the frequency domain position of the first frequency domain resource, the first identifier } of the second sequence having the same length as the first reference sequence is used for determining the second sequence.
As an embodiment, through the use of the inverse transform precoding, the first reference sequence may be generated through a frequency domain, thereby simplifying a protocol.
In one embodiment, the second sequence is a complex sequence.
As an embodiment, the second sequence is a real sequence.
As an embodiment, the second sequence is a ZC (Zadoff-Chu) sequence.
As an embodiment, the second sequence is a ZC sequence that is obtained by slicing.
As an embodiment, the second sequence is a ZC sequence obtained by complementing 0.
As an embodiment, the second sequence is a ZC sequence that has been oversampled, where the elements in the sequence are values of sample points.
As an embodiment, the second sequence is a ZC sequence that is cyclically extended.
As an embodiment, the second sequence is a ZC sequence that is cyclically shifted.
As an embodiment, the second sequence is a ZC sequence that is cyclically extended and cyclically shifted.
As an embodiment, the second sequence is a ZC sequence of length 63.
As an embodiment, the second sequence is a ZC sequence of length 63 with 32 th element removed.
As an embodiment, the second sequence is a ZC sequence of length 63 that is cyclically extended or 0-complemented.
As an embodiment, the second sequence is a ZC sequence of length 63, which is obtained by removing the 32 th element and then performing cyclic extension or 0 compensation.
As an embodiment, the second sequence is generated by a ZC sequence having a root factor of one of {25,29,34 }.
As an embodiment, the second sequence is an m-sequence.
In an embodiment, the second sequence is a sequence obtained by cyclically shifting an m-sequence.
In one embodiment, the second sequence is a scrambled m-sequence.
In one embodiment, the second sequence is an m-sequence that is obtained by cyclic shift and re-scrambling.
The invention discloses a method used in synchronous user equipment, which comprises the following steps:
-step a. receiving a first wireless signal on a first frequency domain resource in a first time window;
-step b. generating a fourth sequence based on the first wireless signal;
-step c. the fourth sequence is correlated with the first sequence.
Wherein the fourth sequence is used to determine a first base sequence used to generate a first reference sequence used to generate the first sequence. The length of the first sequence is equal to the length of the fourth sequence, and the length of the first reference sequence is equal to the length of the fourth sequence. The first time window comprises X1 time intervals, the X1 is a positive integer, and the time length of the X1 time intervals is configurable and is related to subcarrier spacing. The portions of the first sequence in the X1 time intervals are used to generate X1 subsequences, respectively. The positions of the X1 sub-sequences in the first sequence are respectively in one-to-one correspondence with the positions of X1 sub-reference sequences in the first reference sequence, and the correlation between the sub-sequences and the corresponding sub-reference sequences is 1. And the correlation between the sequence formed by the elements in the middle of any two adjacent subsequences in the first sequence and the sequence formed by the elements at the corresponding position in the first reference sequence is less than 1.
As an embodiment, the fourth sequence is a sequence obtained by sampling the first wireless signal.
As one embodiment, the correlation refers to a cross-correlation operation.
Specifically, according to an aspect of the present invention, the method is characterized in that the step a further includes the steps of:
step A0. receives the first signaling.
Wherein the first signaling is used to determine at least one of { the length in time of the X1 time intervals, the subcarrier spacing of the X1 time intervals }.
Specifically, according to an aspect of the present invention, the method is characterized in that the step a further includes the steps of:
-a step a1. generating the first reference sequence.
Wherein { at least one of a time-domain position of the first time window, a frequency-domain position of the first frequency-domain resource, a first identity } is used to generate the first base sequence, the first base sequence is oversampled by a factor of Q to generate the first reference sequence, the Q being a positive integer; or the first base sequence generates the first reference sequence through cyclic shift. The first identifier is an integer, and the first identifier includes at least one of { a cell identifier for transmitting the first wireless signal, a TRP group identifier for transmitting the first wireless signal, and a beam identifier for transmitting the first wireless signal }.
Specifically, according to an aspect of the present invention, the method is characterized in that the generating the first reference sequence by performing Q-fold oversampling on the first base sequence is: the first base sequence generates a third sequence through transform precoding and sequence spreading, the third sequence generates the first reference sequence through inverse transform precoding, wherein the length of the third sequence is the same as the length of the first reference sequence, the length of the third sequence is Q times of the length of the first base sequence, and the inverse transform precoding is an inverse operation of the transform precoding.
Specifically, according to an aspect of the present invention, the method is characterized in that the step a further includes the steps of:
-a step a2. determining the position of the X1 time intervals in the first time window.
Wherein the first time window is reserved for X1 wideband modulation symbols in sequence in the time domain; or the first time window is reserved for a first basic symbol and X2 wideband modulation symbols in sequence in time domain, wherein the X2 is the X1 minus 1, the wideband modulation symbols include basic symbols and corresponding CPs in time domain, and the time length of each basic symbol and the time length of the corresponding CP in the first time window are configurable and related to the subcarrier spacing of the basic symbol.
Specifically, according to an aspect of the present invention, the above method is characterized in that the X1 subsequences are sequentially subjected to transform precoding at the X1 time intervals to generate X1 frequency domain subsequences, and the X1 frequency domain subsequences are sequentially subjected to OFDM-based modulation at the X1 time intervals to generate X1 basic symbols in the X1 time intervals.
Specifically, according to an aspect of the present invention, the method is characterized in that the step a further includes the steps of:
-a step a3. generating a second sequence
Wherein the second sequence is subjected to the inverse transform precoding to generate the first reference sequence, and at least one of { the time domain position of the first time window, the frequency domain position of the first frequency domain resource, the first identifier } of the second sequence having the same length as the first reference sequence is used for determining the second sequence.
The invention discloses a base station device used for synchronization, which comprises the following modules:
a first sending module: for transmitting a first wireless signal on a first frequency domain resource in a first time window.
Wherein the first wireless signal is generated by a first sequence, the first wireless signal being used to determine a first base sequence. The first base sequence is used to generate a first reference sequence. The length of the first sequence is equal to the length of the first reference sequence. The first time window comprises X1 time intervals, the X1 is a positive integer, and the time length of the X1 time intervals is configurable and is related to subcarrier spacing. The portions of the first wireless signal in the X1 time intervals are generated by X1 subsequences, respectively. The positions of the X1 sub-sequences in the first sequence are respectively in one-to-one correspondence with the positions of X1 sub-reference sequences in the first reference sequence, and the correlation between the sub-sequences and the corresponding sub-reference sequences is 1. And the correlation between the sequence formed by the elements in the middle of any two adjacent subsequences in the first sequence and the sequence formed by the elements at the corresponding position in the first reference sequence is less than 1.
Specifically, according to an aspect of the present invention, the base station device is characterized in that the first sending module is further configured to send a first signaling, where the first signaling is used to determine at least one of { the time length of the X1 time intervals, and the subcarrier spacing of the X1 time intervals }.
Specifically, according to an aspect of the present invention, the base station device is characterized in that the first sending module is further configured to generate the first reference sequence. { at least one of a time-domain position of the first time window, a frequency-domain position of the first frequency-domain resource, a first identity }, is used to generate the first base sequence, which is Q-fold oversampled to generate the first reference sequence, Q being a positive integer; or the first base sequence generates the first reference sequence through cyclic shift. The first identifier is an integer, and the first identifier includes at least one of { a cell identifier for transmitting the first wireless signal, a TRP group identifier for transmitting the first wireless signal, and a beam identifier for transmitting the first wireless signal }.
Specifically, according to an aspect of the present invention, the base station apparatus is characterized in that the generating the first reference sequence by performing Q-fold oversampling on the first base sequence is: the first base sequence generates a third sequence through transform precoding and sequence spreading, the third sequence generates the first reference sequence through inverse transform precoding, wherein the length of the third sequence is the same as the length of the first reference sequence, the length of the third sequence is Q times of the length of the first base sequence, and the inverse transform precoding is an inverse operation of the transform precoding.
Specifically, according to an aspect of the present invention, the base station device is characterized in that the first sending module is further configured to determine positions of the X1 time intervals in the first time window. The first time window is reserved for X1 wideband modulation symbols in sequence in the time domain; or the first time window is reserved for a first basic symbol and X2 wideband modulation symbols in sequence in time domain, wherein the X2 is the X1 minus 1, the wideband modulation symbols include basic symbols and corresponding CPs in time domain, and the time length of each basic symbol and the time length of the corresponding CP in the first time window are configurable and related to the subcarrier spacing of the basic symbol.
Specifically, according to an aspect of the present invention, the base station device is characterized in that the X1 subsequences are sequentially subjected to transform precoding at the X1 time intervals to generate X1 frequency-domain subsequences, and the X1 frequency-domain subsequences are sequentially subjected to OFDM-based modulation at the X1 time intervals to generate X1 basic symbols in the X1 time intervals.
Specifically, according to an aspect of the present invention, the base station device is characterized in that the first sending module is further configured to generate a second sequence. The second sequence is subjected to the inverse transform precoding to generate the first reference sequence, and at least one of { the time domain position of the first time window, the frequency domain position of the first frequency domain resource, the first identifier } of the second sequence having the same length as the first reference sequence is used for determining the second sequence.
The invention discloses user equipment used for synchronization, which comprises the following modules:
-a first receiving module: for receiving a first wireless signal on a first frequency domain resource in a first time window;
-a first processing module: means for generating a fourth sequence based on the first wireless signal;
-a second processing module: for correlating the fourth sequence with the first sequence.
Wherein the fourth sequence is used to determine a first base sequence used to generate a first reference sequence used to generate the first sequence. The length of the first sequence is equal to the length of the fourth sequence, and the length of the first reference sequence is equal to the length of the fourth sequence. The first time window comprises X1 time intervals, the X1 is a positive integer, and the time length of the X1 time intervals is configurable and is related to subcarrier spacing. The portions of the first sequence in the X1 time intervals are used to generate X1 subsequences, respectively. The positions of the X1 sub-sequences in the first sequence are respectively in one-to-one correspondence with the positions of X1 sub-reference sequences in the first reference sequence, and the correlation between the sub-sequences and the corresponding sub-reference sequences is 1. And the correlation between the sequence formed by the elements in the middle of any two adjacent subsequences in the first sequence and the sequence formed by the elements at the corresponding position in the first reference sequence is less than 1.
Specifically, according to an aspect of the present invention, the above user equipment is characterized in that the first receiving module is further configured to receive a first signaling, where the first signaling is used to determine at least one of a time length of the X1 time intervals and a subcarrier spacing of the X1 time intervals.
Specifically, according to an aspect of the present invention, the user equipment is characterized in that the second processing module is further configured to generate the first reference sequence. { at least one of a time-domain position of the first time window, a frequency-domain position of the first frequency-domain resource, a first identity }, is used to generate the first base sequence, which is Q-fold oversampled to generate the first reference sequence, Q being a positive integer; or the first base sequence generates the first reference sequence through cyclic shift. The first identifier is an integer, and the first identifier includes at least one of { a cell identifier for transmitting the first wireless signal, a TRP group identifier for transmitting the first wireless signal, and a beam identifier for transmitting the first wireless signal }.
Specifically, according to an aspect of the present invention, the above user equipment is characterized in that the generating the first reference sequence by performing Q-fold oversampling on the first base sequence refers to: the first base sequence generates a third sequence through transform precoding and sequence spreading, the third sequence generates the first reference sequence through inverse transform precoding, wherein the length of the third sequence is the same as the length of the first reference sequence, the length of the third sequence is Q times of the length of the first base sequence, and the inverse transform precoding is an inverse operation of the transform precoding.
Specifically, according to an aspect of the present invention, the user equipment is characterized in that the second processing module is further configured to determine positions of the X1 time intervals in the first time window. The first time window is reserved for X1 wideband modulation symbols in sequence in the time domain; or the first time window is reserved for a first basic symbol and X2 wideband modulation symbols in sequence in time domain, wherein the X2 is the X1 minus 1, the wideband modulation symbols include basic symbols and corresponding CPs in time domain, and the time length of each basic symbol and the time length of the corresponding CP in the first time window are configurable and related to the subcarrier spacing of the basic symbol.
Specifically, according to an aspect of the present invention, the above user equipment is characterized in that the X1 subsequences are sequentially subjected to transform precoding at the X1 time intervals to generate X1 frequency domain subsequences, and the X1 frequency domain subsequences are sequentially subjected to OFDM-based modulation at the X1 time intervals to generate X1 basic symbols in the X1 time intervals.
Specifically, according to an aspect of the present invention, the user equipment is characterized in that the second processing module is further configured to generate a second sequence. The second sequence is subjected to the inverse transform precoding to generate the first reference sequence, and at least one of { the time domain position of the first time window, the frequency domain position of the first frequency domain resource, the first identifier } of the second sequence having the same length as the first reference sequence is used for determining the second sequence.
The invention has the following main technical advantages:
when the base station configures different mathematical structures (Numerology) for the transmission of the synchronization signal, the transmitted synchronization signal can always maintain nearly the same waveform, greatly reducing the complexity of the user equipment in signal detection and time-frequency synchronization.
In OFDM-based systems, the insertion of the cyclic prefix does not destroy the auto-and cross-correlation of the sequence generating the synchronization signal, ensuring the performance of the synchronization.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 shows a flow diagram of a wireless signal downlink transmission according to an embodiment of the invention;
FIG. 2 shows a schematic diagram of a first time window according to an embodiment of the invention;
fig. 3 shows a first frequency domain resource diagram according to an embodiment of the invention;
FIG. 4 is a diagram illustrating a first base sequence in relation to a first reference sequence, according to an embodiment of the invention;
FIG. 5 is a diagram illustrating the relationship of X1 subsequences to X1 base symbols, according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a second sequence in relation to a first reference sequence, according to an embodiment of the invention;
fig. 7 shows a block diagram of a processing means in a base station according to an embodiment of the invention;
FIG. 8 shows a block diagram of a processing device in a User Equipment (UE) according to an embodiment of the invention;
Detailed Description
The technical solutions of the present invention will be further described in detail with reference to the accompanying drawings, and it should be noted that the features of the embodiments and examples of the present application may be arbitrarily combined with each other without conflict.
Example 1
For theBase station N1First signaling is transmitted in step S11, a second sequence is generated in step S12, a first reference sequence is generated in step S13, the positions of X1 time intervals in a first time window are determined in step S14, and a first wireless signal is transmitted on a first frequency domain resource in the first time window in step S15.
For theUE U2The first signaling is received in step S21, the second sequence is generated in step S22, the first reference sequence is generated in step S23, the positions of X1 time intervals in a first time window are determined in step S24, the first wireless signal is received on a first frequency domain resource in the first time window in step S25, the fourth sequence is generated in step S26, and the fourth sequence is correlated with the first sequence in step S27.
In embodiment 1, the first wireless signal is generated from a first sequence, the first wireless signal being used to determine a first base sequence. The first base sequence is used to generate a first reference sequence. The length of the first sequence is equal to the length of the first reference sequence. The first time window comprises X1 time intervals, the X1 is a positive integer, and the time length of the X1 time intervals is configurable and is related to subcarrier spacing. The portions of the first wireless signal in the X1 time intervals are generated by X1 subsequences, respectively. The positions of the X1 sub-sequences in the first sequence are respectively in one-to-one correspondence with the positions of X1 sub-reference sequences in the first reference sequence, and the correlation between the sub-sequences and the corresponding sub-reference sequences is 1. And the correlation between the sequence formed by the elements in the middle of any two adjacent subsequences in the first sequence and the sequence formed by the elements at the corresponding position in the first reference sequence is less than 1. The first signaling is used to determine at least one of { the length in time of the X1 time intervals, the subcarrier spacing of the X1 time intervals }.
In sub-embodiment 1 of embodiment 1, at least one of { time domain position of the first time window, frequency domain position of the first frequency domain resource, first flag } is used to generate the first base sequence, the first base sequence is oversampled by a factor of Q to generate the first reference sequence, the Q is a positive integer; or the first base sequence generates the first reference sequence through cyclic shift. The first identifier is an integer, and the first identifier includes at least one of { a cell identifier for transmitting the first wireless signal, a TRP group identifier for transmitting the first wireless signal, and a beam identifier for transmitting the first wireless signal }.
In sub-embodiment 2 of embodiment 1, the first time window is reserved in sequence in the time domain for X1 wideband modulation symbols; or the first time window is reserved for a first basic symbol and X2 wideband modulation symbols in sequence in time domain, wherein the X2 is the X1 minus 1, the wideband modulation symbols include basic symbols and corresponding CPs in time domain, and the time length of each basic symbol and the time length of the corresponding CP in the first time window are configurable and related to the subcarrier spacing of the basic symbol.
As a sub-embodiment of the foregoing sub-embodiment, the X1 subsequences are sequentially subjected to transform precoding at the X1 time intervals to generate X1 frequency-domain subsequences, and the X1 frequency-domain subsequences are sequentially subjected to OFDM-based modulation at the X1 time intervals to generate X1 basic symbols in the X1 time intervals.
In sub-embodiment 3 of embodiment 1, a second sequence is generated, the second sequence being subjected to the inverse transform precoding to generate the first reference sequence, the second sequence comprising the same number of elements as the first reference sequence, at least one of { the time-domain position of the first time window, the frequency-domain position of the first frequency-domain resource, the first flag } being used to determine the second sequence.
In sub-embodiment 4 of embodiment 1, a fourth sequence is generated based on the first radio signal, the fourth sequence being a sequence obtained by sampling the first radio signal.
In sub-embodiment 5 of embodiment 1, the first signaling is transmitted through DCI (Downlink control information).
In sub-embodiment 6 of embodiment 1, the first signaling is transmitted through rrc (radio Resource control).
In sub-embodiment 7 of embodiment 1, the first wireless Signal is a Primary Synchronization Signal (PSS).
In a sub-embodiment 8 of embodiment 1, the first wireless Signal is a Secondary Synchronization Signal (SSS).
Example 2
Example 2 illustrates a first time window diagram, as shown in figure 2. In fig. 2, the first time window includes X1 time intervals, each numbered rectangle represents one of X1 time intervals, the X1 time intervals are sequentially distributed in the first time window, and two adjacent time intervals are consecutive or spaced in the X1 time intervals.
In sub-embodiment 1 of embodiment 2, any two of the X1 time intervals are orthogonal (i.e., do not overlap) in the time domain.
In a sub-embodiment 2 of embodiment 2, the time lengths of the X1 time intervals are the same.
In sub-embodiment 3 of embodiment 2, the length of time in which there are two of the X1 time intervals is different.
In sub-embodiment 4 of embodiment 2, any 1 of the X1 time intervals is 1 OFDM symbol, and the OFDM symbol includes a data symbol and a CP.
Example 3
In sub-embodiment 1 of embodiment 3, all of the X1 time intervals are the same subcarrier spacing in the first frequency-domain resource.
In sub-embodiment 2 of embodiment 3, two of the X1 time intervals differ in subcarrier spacing in the first frequency-domain resource.
In sub-embodiment 3 of embodiment 3, the length of time in which at least one of the X1 time intervals exists is linearly inversely proportional to the subcarrier spacing.
In sub-embodiment 4 of embodiment 3, the subcarrier spacing for any one of the X1 time intervals is P times 3.75kHz, where P is a non-negative integer power of 2.
Example 4
Example 4 illustrates a schematic diagram of the relationship between the first base sequence and the first reference sequence, as shown in fig. 4. In fig. 4, an unfilled rectangle represents an element in the first base sequence, a filled rectangle represents an element in the first reference sequence, and the first base sequence is oversampled by Q times to generate the first reference sequence, where Q is a positive integer.
In sub-example 1 of example 4, said Q-fold oversampling of the sequence refers to: each element in the sequence is expanded by a factor of Q to form a new sequence of length Q.
In sub-embodiment 2 of embodiment 4, the generation of the first reference sequence by performing Q-fold oversampling on the first base sequence refers to: the first base sequence generates a third sequence through transform precoding and sequence spreading, the third sequence generates the first reference sequence through inverse transform precoding, wherein the length of the third sequence is the same as the length of the first reference sequence, the length of the third sequence is Q times of the length of the first base sequence, and the inverse transform precoding is an inverse operation of the transform precoding. As a sub-embodiment of sub-embodiment 2, the Transform pre-coding is DFT (discrete Fourier Transform) or FFT (Fast Fourier Transform). As another sub-embodiment of sub-embodiment 2, the inverse transform pre-coding is idft (inverse discrete Fourier transform) or ifft (inverse Fast Fourier transform).
In sub-embodiment 3 of embodiment 4, at least one of { time domain position of the first time window, frequency domain position of the first frequency domain resource, first identity } is used to generate the first base sequence. The first identifier includes at least one of { cell identifier for transmitting a first wireless signal, TRP identifier for transmitting the first wireless signal, TRP group identifier for transmitting the first wireless signal, beam identifier for transmitting the first wireless signal }
In a sub-embodiment 4 of the embodiment 4, the first base sequence is a ZC (Zadoff-Chu) sequence.
In sub-embodiment 5 of embodiment 4, the first base sequence is a ZC sequence that is cyclically extended and then cyclically shifted.
In sub-embodiment 6 of embodiment 4, the first base sequence is an m-sequence.
Example 5
Example 5 illustrates a schematic diagram of the relationship between the X1 subsequences and the X1 base symbols, as shown in FIG. 5. In fig. 5, each unfilled rectangle represents one of the X1 subsequences, each slashed rectangle represents one of the X1 frequency-domain subsequences, and each vertical-lined rectangle represents one of the X1 symbols.
In embodiment 5, the X1 subsequences are sequentially subjected to transform precoding at the X1 time intervals to generate the X1 frequency-domain subsequences, and the X1 frequency-domain subsequences are sequentially subjected to OFDM-based modulation at the X1 time intervals to generate X1 basic symbols in the X1 time intervals.
In sub-embodiment 1 of embodiment 5, the X1 time intervals are reserved for X1 wideband modulation symbols in turn; or the X1 time intervals are reserved for a first basic symbol and X2 wideband modulation symbols in turn, the X2 is the X1 minus 1, the wideband modulation symbols include basic symbols and corresponding CPs in time domain, a time length of each basic symbol and a time length of the corresponding CP in the first time window are configurable and are related to a subcarrier interval of the basic symbol.
In sub-embodiment 2 of embodiment 5, the CP corresponding to the first said primary symbol is transmitted outside said X1 time intervals.
In sub-embodiment 3 of embodiment 5, the OFDM-based modulation does not include adding a CP.
In sub-embodiment 4 of embodiment 5, the OFDM-based modulation is implemented by IFFT.
In a sub-embodiment 5 of embodiment 5, the OFDM based modulation comprises time domain filtering.
In sub-embodiment 6 of embodiment 5, the OFDM-based modulation comprises frequency domain filtering.
In sub-embodiment 7 of embodiment 5, the OFDM based modulation comprises Windowing. The first pool of resources is contiguous in the frequency domain.
Example 6
Example 6 illustrates a schematic diagram of the relationship between the second sequence and the first reference sequence, as shown in fig. 6. In fig. 6, a small rectangle without padding represents an element in the second sequence, and a small rectangle with cross-hatching represents an element in the first reference sequence.
In embodiment 6, the second sequence is subjected to the inverse transform precoding to generate the first reference sequence, and at least one of the number of elements included in the second sequence is the same as the number of elements included in the first reference sequence, { time domain position of first time window, frequency domain position of first frequency domain resource, first flag } is used to determine the second sequence.
In sub-embodiment 1 of embodiment 6, the second sequence is a ZC (Zadoff-Chu) sequence.
In sub-embodiment 2 of embodiment 6, the second sequence is a ZC sequence that has been clipped.
In sub-embodiment 3 of embodiment 6, the second sequence is a ZC sequence that is obtained by complementing 0.
In sub-embodiment 4 of embodiment 6, the second sequence is a length-63 ZC sequence.
In sub-embodiment 5 of embodiment 6, the second sequence is a ZC sequence of length 63 with 32 nd element removed.
In a sub-embodiment 6 of embodiment 6, the second sequence is generated with a ZC sequence having a root factor of one of {25,29,34 }.
Example 7
Embodiment 7 is a block diagram illustrating a processing apparatus in a base station device, as shown in fig. 7. In fig. 7, the base station processing apparatus 100 is mainly composed of a first transmission module 101.
In embodiment 7, the first transmitting module 101 is configured to transmit a first wireless signal on a first frequency domain resource in a first time window. The first wireless signal is generated from a first sequence, and the first wireless signal is used to determine a first base sequence. The first base sequence is used to generate a first reference sequence. The length of the first sequence is equal to the length of the first reference sequence. The first time window comprises X1 time intervals, the X1 is a positive integer, and the time length of the X1 time intervals is configurable and is related to subcarrier spacing. The portions of the first wireless signal in the X1 time intervals are generated by X1 subsequences, respectively. The positions of the X1 sub-sequences in the first sequence are respectively in one-to-one correspondence with the positions of X1 sub-reference sequences in the first reference sequence, and the correlation between the sub-sequences and the corresponding sub-reference sequences is 1. And the correlation between the sequence formed by the elements in the middle of any two adjacent subsequences in the first sequence and the sequence formed by the elements at the corresponding position in the first reference sequence is less than 1. The first transmitting module is further configured to transmit a first signaling, the first signaling being used to determine at least one of { the length in time of the X1 time intervals, the subcarrier spacing of the X1 time intervals }.
In sub-embodiment 1 of embodiment 7, at least one of { time domain position of the first time window, frequency domain position of the first frequency domain resource, first flag } is used to generate the first base sequence, the first base sequence is oversampled by a factor of Q to generate the first reference sequence, Q being a positive integer; or the first base sequence generates the first reference sequence through cyclic shift. The first identifier is an integer, and the first identifier includes at least one of { a cell identifier for transmitting the first wireless signal, a TRP group identifier for transmitting the first wireless signal, and a beam identifier for transmitting the first wireless signal }.
In sub-embodiment 2 of embodiment 7, the first time window is reserved in sequence in the time domain for X1 wideband modulation symbols; or the first time window is reserved for a first basic symbol and X2 wideband modulation symbols in sequence in time domain, wherein the X2 is the X1 minus 1, the wideband modulation symbols include basic symbols and corresponding CPs in time domain, and the time length of each basic symbol and the time length of the corresponding CP in the first time window are configurable and related to the subcarrier spacing of the basic symbol.
As a sub-embodiment of the foregoing sub-embodiment, the X1 subsequences are sequentially subjected to transform precoding at the X1 time intervals to generate X1 frequency-domain subsequences, and the X1 frequency-domain subsequences are sequentially subjected to OFDM-based modulation at the X1 time intervals to generate X1 basic symbols in the X1 time intervals.
In sub-embodiment 3 of embodiment 7, a second sequence is generated, the second sequence being subjected to the inverse transform precoding to generate the first reference sequence, the second sequence comprising the same number of elements as the first reference sequence, at least one of { the time-domain position of the first time window, the frequency-domain position of the first frequency-domain resource, the first flag } being used to determine the second sequence.
In sub-embodiment 4 of embodiment 7, the first signaling is transmitted through DCI (Downlink control information).
In sub-embodiment 5 of embodiment 7, the first signaling is transmitted through rrc (radio Resource control).
In sub-embodiment 6 of embodiment 7, the first wireless Signal is a Primary Synchronization Signal (PSS).
In a sub-embodiment 7 of embodiment 7, the first wireless Signal is a Secondary Synchronization Signal (SSS).
Example 8
Embodiment 8 is a block diagram illustrating a processing apparatus in a user equipment, as shown in fig. 8. In fig. 8, the ue processing apparatus 200 is mainly composed of a first receiving module 201, a first processing module 202 and a second processing module 203.
In embodiment 8, the first receiving module 201 is configured to receive a first wireless signal on a first frequency domain resource in a first time window. The first processing module 202 is configured to generate a fourth sequence based on the first wireless signal. The second processing module 203 is configured to correlate the fourth sequence with the first sequence. The fourth sequence is used to determine a first base sequence used to generate a first reference sequence used to generate the first sequence. The length of the first sequence is equal to the length of the fourth sequence, and the length of the first reference sequence is equal to the length of the fourth sequence. The first time window comprises X1 time intervals, the X1 is a positive integer, and the time length of the X1 time intervals is configurable and is related to subcarrier spacing. The portions of the first sequence in the X1 time intervals are used to generate X1 subsequences, respectively. The positions of the X1 sub-sequences in the first sequence are respectively in one-to-one correspondence with the positions of X1 sub-reference sequences in the first reference sequence, and the correlation between the sub-sequences and the corresponding sub-reference sequences is 1. And the correlation between the sequence formed by the elements in the middle of any two adjacent subsequences in the first sequence and the sequence formed by the elements at the corresponding position in the first reference sequence is less than 1. The first receiving module 201 is further configured to receive a first signaling, the first signaling being used to determine at least one of { the time length of the X1 time intervals, the subcarrier spacing of the X1 time intervals }.
In sub-embodiment 1 of embodiment 8, at least one of { time domain position of the first time window, frequency domain position of the first frequency domain resource, first flag } is used to generate the first base sequence, the first base sequence is oversampled by a factor of Q to generate the first reference sequence, Q being a positive integer; or the first base sequence generates the first reference sequence through cyclic shift. The first identifier is an integer, and the first identifier includes at least one of { a cell identifier for transmitting the first wireless signal, a TRP group identifier for transmitting the first wireless signal, and a beam identifier for transmitting the first wireless signal }.
In sub-embodiment 2 of embodiment 8, the first time window is reserved in sequence in the time domain for X1 wideband modulation symbols; or the first time window is reserved for a first basic symbol and X2 wideband modulation symbols in sequence in time domain, wherein the X2 is the X1 minus 1, the wideband modulation symbols include basic symbols and corresponding CPs in time domain, and the time length of each basic symbol and the time length of the corresponding CP in the first time window are configurable and related to the subcarrier spacing of the basic symbol.
As a sub-embodiment of the foregoing sub-embodiment, the X1 subsequences are sequentially subjected to transform precoding at the X1 time intervals to generate X1 frequency-domain subsequences, and the X1 frequency-domain subsequences are sequentially subjected to OFDM-based modulation at the X1 time intervals to generate X1 basic symbols in the X1 time intervals.
In sub-embodiment 3 of embodiment 8, a second sequence is generated, the second sequence being subjected to the inverse transform precoding to generate the first reference sequence, the second sequence comprising the same number of elements as the first reference sequence, at least one of { the time-domain position of the first time window, the frequency-domain position of the first frequency-domain resource, the first flag } being used to determine the second sequence.
In a sub-embodiment 4 of the embodiment 8, a fourth sequence is generated based on the first radio signal, the fourth sequence being a sequence obtained by sampling the first radio signal.
In sub-embodiment 5 of embodiment 8, the first signaling is transmitted through DCI (Downlink control information).
In sub-embodiment 6 of embodiment 8, the first signaling is transmitted through rrc (radio Resource control).
In sub-embodiment 7 of embodiment 8, the first wireless Signal is a Primary Synchronization Signal (PSS).
In a sub-embodiment 8 of embodiment 1, the first wireless Signal is a Secondary Synchronization Signal (SSS).
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a hard disk or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented by using one or more integrated circuits. Accordingly, the module units in the above embodiments may be implemented in a hardware form, or may be implemented in a form of software functional modules, and the present application is not limited to any specific form of combination of software and hardware. The UE or the terminal in the present invention includes, but is not limited to, a mobile phone, a tablet computer, a notebook, a network card, a low power consumption device, a vehicle-mounted communication device, and other wireless communication devices. The base station or network side device in the present invention includes but is not limited to a macro cell base station, a micro cell base station, a home base station, a relay base station, and other wireless communication devices.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (18)
1. A method in a base station used for synchronization, comprising the steps of:
-step a. transmitting a first wireless signal on a first frequency domain resource in a first time window;
wherein the first wireless signal is generated by a first sequence, the first wireless signal being used to determine a first base sequence; the first base sequence is used to generate a first reference sequence; the length of the first sequence is equal to the length of the first reference sequence; the first time window comprises X1 time intervals, the X1 is a positive integer, the time length of the X1 time intervals is configurable and is related to subcarrier spacing; the portions of the first wireless signal in the X1 time intervals are generated by X1 subsequences, respectively; the positions of the X1 sub-sequences in the first sequence respectively correspond to the positions of X1 sub-reference sequences in the first reference sequence one by one, and the sub-sequences are completely related to the corresponding elements of the corresponding sub-reference sequences; and two mutually corresponding elements exist between the sequence formed by the elements in the middle of any two adjacent subsequences in the first sequence and the sequence formed by the elements at the corresponding position in the first reference sequence, and are independent.
2. The method of claim 1, wherein step a further comprises the steps of:
step A0. sending a first signaling;
wherein the first signaling is used to determine a length in time of the X1 time intervals, at least one of the subcarrier intervals of the X1 time intervals.
3. The method according to claim 1 or 2, wherein said step a further comprises the steps of:
-a step a1. generating the first reference sequence;
wherein at least one of a time domain position of the first time window, a frequency domain position of the first frequency domain resource, and a first identifier is used to generate the first base sequence, the first base sequence is oversampled by a factor of Q to generate the first reference sequence, and Q is a positive integer; or the first base sequence generates the first reference sequence through cyclic shift; the first identifier is an integer, and the first identifier includes at least one of a cell identifier for transmitting the first wireless signal, a TRP group identifier for transmitting the first wireless signal, and a beam identifier for transmitting the first wireless signal.
4. The method of claim 3, wherein the first base sequence being over-sampled by a factor of Q to generate the first reference sequence is: the first base sequence generates a third sequence through transform precoding and sequence spreading, the third sequence generates the first reference sequence through inverse transform precoding, wherein the length of the third sequence is the same as the length of the first reference sequence, the length of the third sequence is Q times of the length of the first base sequence, and the inverse transform precoding is an inverse operation of the transform precoding.
5. The method according to claim 1 or 2, wherein said step a further comprises the steps of:
-a step a2. determining the position of the X1 time intervals in the first time window;
wherein the first time window is reserved for X1 wideband modulation symbols in sequence in the time domain; or the first time window is reserved for a first basic symbol and X2 wideband modulation symbols in sequence in time domain, wherein the X2 is the X1 minus 1, the wideband modulation symbols include basic symbols and corresponding CPs in time domain, and the time length of each basic symbol and the time length of the corresponding CP in the first time window are configurable and related to the subcarrier spacing of the basic symbol.
6. The method of claim 5, wherein the X1 subsequences are sequentially subjected to transform precoding at the X1 time intervals to generate X1 frequency-domain subsequences, and wherein the X1 frequency-domain subsequences are sequentially subjected to OFDM-based modulation at the X1 time intervals to generate X1 basic symbols in the X1 time intervals.
7. The method according to claim 1 or 2, wherein said step a further comprises the steps of:
-a step a3. generating a second sequence;
wherein the second sequence is inverse transform pre-coded to generate the first reference sequence, a length of the second sequence is the same as a length of the first reference sequence, a time domain position of the first time window, a frequency domain position of the first frequency domain resource, at least one of a first flag is used to determine the second sequence.
8. A method in a user equipment to be used for synchronization, comprising the steps of:
-step a. receiving a first wireless signal on a first frequency domain resource in a first time window;
-step b. generating a fourth sequence based on the first wireless signal;
-step c. the fourth sequence is correlated with the first sequence;
wherein the fourth sequence is used to determine a first base sequence used to generate a first reference sequence used to generate the first sequence; the length of the first sequence is equal to the length of the fourth sequence, and the length of the first reference sequence is equal to the length of the fourth sequence; the first time window comprises X1 time intervals, the X1 is a positive integer, the time length of the X1 time intervals is configurable and is related to subcarrier spacing; the portions of the first sequence in the X1 time intervals are used to generate X1 subsequences, respectively; the positions of the X1 sub-sequences in the first sequence respectively correspond to the positions of X1 sub-reference sequences in the first reference sequence one by one, and the sub-sequences are completely related to the corresponding elements of the corresponding sub-reference sequences; and two mutually corresponding elements exist between the sequence formed by the elements in the middle of any two adjacent subsequences in the first sequence and the sequence formed by the elements at the corresponding position in the first reference sequence, and are independent.
9. The method of claim 8, wherein step a further comprises the steps of:
-step A0. receiving the first signaling;
wherein the first signaling is used to determine a length in time of the X1 time intervals, at least one of the subcarrier intervals of the X1 time intervals.
10. The method according to claim 8 or 9, wherein said step a further comprises the steps of:
-a step a1. generating the first reference sequence;
wherein at least one of a time domain position of the first time window, a frequency domain position of the first frequency domain resource, and a first identifier is used to generate the first base sequence, the first base sequence is oversampled by a factor of Q to generate the first reference sequence, and Q is a positive integer; or the first base sequence generates the first reference sequence through cyclic shift; the first identifier is an integer, and the first identifier includes at least one of a cell identifier for transmitting the first wireless signal, a TRP group identifier for transmitting the first wireless signal, and a beam identifier for transmitting the first wireless signal.
11. The method of claim 10, wherein the first base sequence being over-sampled by a factor of Q to generate the first reference sequence is: the first base sequence generates a third sequence through transform precoding and sequence spreading, the third sequence generates the first reference sequence through inverse transform precoding, wherein the length of the third sequence is the same as the length of the first reference sequence, the length of the third sequence is Q times of the length of the first base sequence, and the inverse transform precoding is an inverse operation of the transform precoding.
12. The method according to claim 8 or 9, wherein said step a further comprises the steps of:
-a step a2. determining the position of the X1 time intervals in the first time window;
wherein the first time window is reserved for X1 wideband modulation symbols in sequence in the time domain; or the first time window is reserved for a first basic symbol and X2 wideband modulation symbols in sequence in time domain, wherein the X2 is the X1 minus 1, the wideband modulation symbols include basic symbols and corresponding CPs in time domain, and the time length of each basic symbol and the time length of the corresponding CP in the first time window are configurable and related to the subcarrier spacing of the basic symbol.
13. The method of claim 12, wherein the X1 subsequences are sequentially subjected to transform precoding at the X1 time intervals to generate X1 frequency-domain subsequences, and wherein the X1 frequency-domain subsequences are sequentially subjected to OFDM-based modulation at the X1 time intervals to generate X1 basic symbols in the X1 time intervals.
14. The method according to claim 8 or 9, wherein said step a further comprises the steps of:
-a step a3. generating a second sequence;
wherein the second sequence is inverse transform pre-coded to generate the first reference sequence, a length of the second sequence is the same as a length of the first reference sequence, a time domain position of the first time window, a frequency domain position of the first frequency domain resource, at least one of a first flag is used to determine the second sequence.
15. A base station device used for synchronization, comprising:
a first sending module: means for transmitting a first wireless signal on a first frequency domain resource in a first time window;
wherein the first wireless signal is generated by a first sequence, the first wireless signal being used to determine a first base sequence; the first base sequence is used to generate a first reference sequence; the length of the first sequence is equal to the length of the first reference sequence; the first time window comprises X1 time intervals, the X1 is a positive integer, the time length of the X1 time intervals is configurable and is related to subcarrier spacing; the portions of the first wireless signal in the X1 time intervals are generated by X1 subsequences, respectively; the positions of the X1 sub-sequences in the first sequence respectively correspond to the positions of X1 sub-reference sequences in the first reference sequence one by one, and the sub-sequences are completely related to the corresponding elements of the corresponding sub-reference sequences; and two mutually corresponding elements exist between the sequence formed by the elements in the middle of any two adjacent subsequences in the first sequence and the sequence formed by the elements at the corresponding position in the first reference sequence, and are independent.
16. The base station device of claim 15, wherein the first transmitting module is further configured to transmit a first signaling, the first signaling being used to determine a length of time of the X1 time intervals, at least one of subcarrier intervals of the X1 time intervals.
17. A user equipment used for synchronization, comprising:
-a first receiving module: for receiving a first wireless signal on a first frequency domain resource in a first time window;
-a first processing module: means for generating a fourth sequence based on the first wireless signal;
-a second processing module: correlating the fourth sequence with the first sequence;
wherein the fourth sequence is used to determine a first base sequence used to generate a first reference sequence used to generate the first sequence; the length of the first sequence is equal to the length of the fourth sequence, and the length of the first reference sequence is equal to the length of the fourth sequence; the first time window comprises X1 time intervals, the X1 is a positive integer, the time length of the X1 time intervals is configurable and is related to subcarrier spacing; the portions of the first sequence in the X1 time intervals are used to generate X1 subsequences, respectively; the positions of the X1 sub-sequences in the first sequence respectively correspond to the positions of X1 sub-reference sequences in the first reference sequence one by one, and the sub-sequences are completely related to the corresponding elements of the corresponding sub-reference sequences; and two mutually corresponding elements exist between the sequence formed by the elements in the middle of any two adjacent subsequences in the first sequence and the sequence formed by the elements at the corresponding position in the first reference sequence, and are independent.
18. The UE of claim 17, wherein the first receiving module is further configured to receive a first signaling, the first signaling being used to determine the time length of the X1 time intervals, at least one of the subcarrier spacing of the X1 time intervals.
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| CN103281277A (en) * | 2007-09-07 | 2013-09-04 | Lg电子株式会社 | Method of generating reference signal in wireless communicaton system |
| CN103428143A (en) * | 2012-05-22 | 2013-12-04 | 普天信息技术研究院有限公司 | Method for sending synchronization signals |
| WO2015122715A1 (en) * | 2014-02-13 | 2015-08-20 | 엘지전자 주식회사 | Method for transmitting/receiving synchronization signal for d2d communication in wireless communication system, and apparatus therefor |
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| CN103281277A (en) * | 2007-09-07 | 2013-09-04 | Lg电子株式会社 | Method of generating reference signal in wireless communicaton system |
| CN103428143A (en) * | 2012-05-22 | 2013-12-04 | 普天信息技术研究院有限公司 | Method for sending synchronization signals |
| WO2015122715A1 (en) * | 2014-02-13 | 2015-08-20 | 엘지전자 주식회사 | Method for transmitting/receiving synchronization signal for d2d communication in wireless communication system, and apparatus therefor |
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