WO2017054667A1 - 同步信号的传输方法及装置 - Google Patents
同步信号的传输方法及装置 Download PDFInfo
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- WO2017054667A1 WO2017054667A1 PCT/CN2016/099636 CN2016099636W WO2017054667A1 WO 2017054667 A1 WO2017054667 A1 WO 2017054667A1 CN 2016099636 W CN2016099636 W CN 2016099636W WO 2017054667 A1 WO2017054667 A1 WO 2017054667A1
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/08—Speed or phase control by synchronisation signals the synchronisation signals recurring cyclically
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0073—Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0076—Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
Definitions
- the present invention relates to the field of communications, and in particular to a method and apparatus for transmitting a synchronization signal.
- Machine Type Communication User Equipment (User Equipment, Terminal Equipment for short), also known as Machine to Machine (M2M) user communication equipment
- MTC Machine Type Communication
- M2M Machine to Machine
- C-IOT 3rd Generation Partnership Project
- NB-LTE Narrowband LTE
- the system bandwidth of the system is 200 kHz, which is the same as the channel bandwidth of the Global System for Mobile Communication (GSM) system. This is because the NB-LTE system reuses the GSM spectrum and reduces the mutual interference between the adjacent and GSM channels.
- GSM Global System for Mobile Communication
- the transmission bandwidth and the downlink subcarrier spacing of the NB-LTE are 180 kHz and 15 kHz, respectively, and the bandwidth and the sub-band of the Physical Resource Block (PRB) of the Long-Term Evolution (LTE) system, respectively.
- the carrier spacing is the same.
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the embodiment of the invention provides a method and a device for transmitting a synchronization signal, so as to at least solve the problem that the synchronization signal design is unreasonable in the narrowband system of the LTE in the related art.
- a method for transmitting a synchronization signal including:
- the base station repeatedly sends a synchronization signal to the terminal period
- the synchronization signal is transmitted at a time corresponding to a plurality of orthogonal frequency division multiplexing (OFDM) symbols on one or more subframes, and the synchronization signal is a primary synchronization signal PSS or a secondary synchronization signal SSS.
- OFDM orthogonal frequency division multiplexing
- the multiple OFDM symbols include consecutive multiple OFDM symbols in the one subframe, or
- the multiple OFDM symbols are symbols in a preset set, and the set includes a third OFDM symbol and a fourth OFDM symbol of each slot. And the last two OFDM symbol.
- the PSS is located in consecutive k1 radio frames, and is sent in a period of T1 radio frames, where T1 ⁇ k1, and the SSS is sent in a period of T2 radio frames, or
- the PSS is sent in a period of T3 radio frames, and the SSS is located in consecutive k2 radio frames, and is sent in a period of T4 radio frames, T4 ⁇ k2, or
- the PSS and the SSS are located on consecutive k3 radio frames, and are sent in a period of T5 radio frames, T5 ⁇ k3;
- k1, k2, k3, T1, T2, T3, T4, and T5 are all positive integers.
- the synchronization signal includes M OFDM symbols, and the subcarrier spacing of the mth OFDM symbol is 15/A m KHz, where 1 ⁇ m ⁇ M, m, M, and A m are both Is a positive integer.
- the OFDM symbol corresponds to 2 consecutive OFDM symbols
- the 2 consecutive OFDM symbols comprise one of the following:
- the subcarrier spacing is 3.75 KHz, and the OFDM symbol corresponds to 4 consecutive OFDM symbols.
- the reference signal is not sent on the OFDM symbol corresponding to the synchronization signal, or
- the reference signal is transmitted only on the first q OFDM symbols, and q is a positive integer.
- the synchronization signal includes a plurality of sequences, the multiple sequences being generated according to cell identity and/or timing information.
- the synchronization signal includes a plurality of sequences, including, in one repetition period,
- Each OFDM symbol included in the synchronization signal corresponds to one sequence in one repetition period
- the plurality of OFDM symbols included in the synchronization signal correspond to one sequence, wherein each of the OFDM symbols corresponds to a subsequence of the sequence;
- Each of the plurality of subframes corresponds to one sequence on a plurality of subframes within one repetition period.
- each OFDM symbol included in the synchronization signal corresponds to one sequence in one repetition period.
- each OFDM symbol included in the synchronization signal corresponds to a ZC sequence of length 11; wherein a carrier corresponding to the synchronization signal includes 12 subcarriers.
- each of the OFDM symbols or the plurality of OFDM symbols included in the synchronization signal corresponds to one
- the sequence is determined by the OFDM symbol corresponding to the sequence.
- the sending, by the synchronization signal, the time corresponding to the OFDM symbols of the multiple orthogonal frequency division multiplexing technologies on the one or more subframes includes:
- the synchronization signal is transmitted at times corresponding to m of the OFDM symbols, where m ⁇ ⁇ 5, 6, 7, 8, 10, 12 ⁇ .
- the time corresponding to the multiple OFDM symbols includes two parts, and each part of the two parts corresponds to one sequence, and the two parts include:
- the two parts are divided into two parts in chronological order, or
- the two parts are respectively the time corresponding to the OFDM symbol of the odd index and the time corresponding to the OFDM symbol of the even index; wherein the index is an index after the OFDM symbol corresponding to the synchronization signal is renumbered from 0 in chronological order. .
- the value of the SSS sequence, s(k 0 ) is the CRS symbol value corresponding to subcarrier #k 0 .
- a method for transmitting a synchronization signal including:
- the terminal period repeatedly receives the synchronization signal sent by the base station
- the synchronization signal is received at a time corresponding to a plurality of orthogonal frequency division multiplexing (OFDM) symbols on one or more subframes during a repetition period, the synchronization signal being a primary synchronization signal PSS or a secondary synchronization signal SSS.
- OFDM orthogonal frequency division multiplexing
- the multiple OFDM symbols include consecutive multiple OFDM symbols in the one subframe, or
- the multiple OFDM symbols are symbols in a preset set, and the set includes a third OFDM symbol and a fourth OFDM symbol of each slot. And the last two OFDM symbols.
- the PSS is located in consecutive k1 radio frames, and is received in a period of T1 radio frames, where T1 ⁇ k1, and the SSS is received in a period of T2 radio frames, or
- the PSS is received in a period of T3 radio frames, and the SSS is located in consecutive k2 radio frames, and is received in a period of T4 radio frames, T4 ⁇ k2, or
- the PSS and the SSS are located on consecutive k3 radio frames, and are received in a period of T5 radio frames, T5 ⁇ k3;
- k1, k2, k3, T1, T2, T3, T4, and T5 are all positive integers.
- the synchronization signal includes M OFDM symbols, and the subcarrier spacing of the mth OFDM symbol is 15/A m KHz, where 1 ⁇ m ⁇ M, m, M, and A m are both Is a positive integer.
- the OFDM symbol corresponds to 2 consecutive OFDM symbols
- the 2 consecutive OFDM symbol symbols include one of the following:
- the subcarrier spacing is 3.75 KHz, and the OFDM symbol corresponds to 4 consecutive OFDM symbols.
- the OFDM symbol corresponding to the synchronization signal does not receive a reference signal
- the reference signal is received only on the first q OFDM symbols, and q is a positive integer.
- the synchronization signal includes a plurality of sequences, the multiple sequences being generated according to cell identity and/or timing information.
- the synchronization signal includes a plurality of sequences, including, in one repetition period,
- Each OFDM symbol included in the synchronization signal corresponds to one sequence in one repetition period
- the plurality of OFDM symbols included in the synchronization signal correspond to one sequence, wherein each of the OFDM symbols corresponds to a subsequence of the sequence;
- Each of the plurality of subframes corresponds to one sequence on a plurality of subframes within one repetition period.
- the sequence is determined by an OFDM symbol corresponding to the sequence.
- receiving, by the synchronization signal, the time corresponding to the OFDM symbols of the multiple orthogonal frequency division multiplexing technologies on the one or more subframes includes:
- the synchronization signal is received at times corresponding to m of the OFDM symbols, where m ⁇ ⁇ 5, 6, 7, 8, 10, 12 ⁇ .
- the time corresponding to the multiple OFDM symbols includes two parts, and each part of the two parts corresponds to one sequence, and the two parts include:
- the two parts are divided into two parts in chronological order, or
- the two parts are respectively the time corresponding to the OFDM symbol of the odd index and the time corresponding to the OFDM symbol of the even index; wherein the index is an index after the OFDM symbol corresponding to the synchronization signal is renumbered from 0 in chronological order. .
- the value of the corresponding PSS or SSS sequence, s(k 0 ) is the CRS symbol value corresponding to subcarrier #k 0 .
- the location of the synchronization signal is determined by at least one of:
- the frequency domain position corresponding to the synchronization signal is either a PRB index or a frequency offset.
- the synchronization signal when the cell identifier is X, the synchronization signal is located on the last N subcarriers of the physical resource block where the synchronization signal is located, and when the cell identifier is Y, the synchronization signal is located. On the first N subcarriers of the physical resource block where the synchronization signal is located, where N is a positive integer.
- the cell identifier X satisfies mod(X, 3) equal to 0, the cell identifier Y satisfies mod(Y, 3) is not equal to 0; or the cell identifier Y satisfies mod(Y, 3) is equal to 2, the cell identifier X satisfies mod (X, 3) is not equal to 2; the cell identifier X satisfies mod (X, 6) is equal to 0, and the cell identifier Y satisfies mod (Y, 6) is not equal to 0; The cell identifier Y satisfies mod(Y, 6) equal to 5, and the cell identifier X satisfies mod(X, 6) and is not equal to 5.
- the root index of the ZC sequence is grouped, and the manner of the grouping includes at least one of the following:
- sequences of the second group and the third group are interchangeable.
- the first set of ZC sequences are mapped onto a first OFDM symbol
- the second set of ZC sequences are mapped onto a second OFDM symbol
- the third set of ZC sequences are mapped onto a third OFDM symbol
- the first OFDM symbol includes symbols numbered ⁇ 5, 6, 9, 10, 12, 13 ⁇ in the subframe
- the second OFDM symbol includes the number ⁇ 3, 4 ⁇ in the subframe
- the The three OFDM symbols include symbols numbered ⁇ 7, 8 ⁇ in the subframe, wherein the symbol number in the subframe starts from zero.
- the synchronization signal uses the same ZC sequence used on the last OFDM symbol in the subframe as the ZC sequence used on the last OFDM symbol in the subframe; or, the first OFDM with the second slot
- the symbol uses the same ZC sequence; or, the same as the ZC sequence used by the last OFDM symbol in the first slot; or,
- the step signal uses the same ZC sequence for the first OFDM symbol in the subframe.
- the synchronization index includes an OFDM symbol
- the root index of the sequence corresponding to the chronological order is one of the following:
- the root index of the sequence corresponding to the OFDM symbol in the chronological order is one of the following:
- a synchronization signal transmission apparatus is further provided on the base station side, including:
- a sending module configured to repeatedly send a synchronization signal to the terminal period
- the synchronization signal is transmitted at a time corresponding to a plurality of orthogonal frequency division multiplexing (OFDM) symbols on one or more subframes, and the synchronization signal is a primary synchronization signal PSS or a secondary synchronization signal SSS.
- OFDM orthogonal frequency division multiplexing
- a synchronization signal transmission apparatus is further provided on the terminal side, including:
- a receiving module configured to repeatedly receive a synchronization signal sent by the base station
- the synchronization signal is received at a time corresponding to a plurality of orthogonal frequency division multiplexing (OFDM) symbols on one or more subframes during a repetition period, the synchronization signal being a primary synchronization signal PSS or a secondary synchronization signal SSS.
- OFDM orthogonal frequency division multiplexing
- a storage medium is also provided.
- the storage medium is arranged to store program code for performing the following steps:
- the base station repeatedly sends a synchronization signal to the terminal period
- the synchronization signal is transmitted at a time corresponding to a plurality of orthogonal frequency division multiplexing (OFDM) symbols on one or more subframes, and the synchronization signal is a primary synchronization signal PSS or a secondary synchronization signal SSS.
- OFDM orthogonal frequency division multiplexing
- the storage medium is further arranged to store program code for performing the following steps:
- the synchronization signal is transmitted at times corresponding to m of the OFDM symbols, where m ⁇ ⁇ 5, 6, 7, 8, 10, 12 ⁇ .
- the storage medium is further arranged to store program code for performing the following steps:
- the time corresponding to the multiple OFDM symbols includes two parts, and each part of the two parts corresponds to one sequence, and the two parts include:
- the two parts are divided into two parts in chronological order, or
- the two parts are respectively the time corresponding to the OFDM symbol of the odd index and the time corresponding to the OFDM symbol of the even index; wherein the index is an index after the OFDM symbol corresponding to the synchronization signal is renumbered from 0 in chronological order. .
- a storage medium is also provided.
- the storage medium is arranged to store program code for performing the following steps:
- the terminal period repeatedly receives the synchronization signal sent by the base station
- the synchronization signal is received at a time corresponding to a plurality of orthogonal frequency division multiplexing (OFDM) symbols on one or more subframes during a repetition period, the synchronization signal being a primary synchronization signal PSS or a secondary synchronization signal SSS.
- OFDM orthogonal frequency division multiplexing
- the storage medium is further arranged to store program code for performing the following steps:
- the PSS is located in consecutive k1 radio frames, and is received in a period of T1 radio frames, where T1 ⁇ k1, and the SSS is received in a period of T2 radio frames, or
- the PSS is received in a period of T3 radio frames, and the SSS is located in consecutive k2 radio frames, and is received in a period of T4 radio frames, T4 ⁇ k2, or
- the PSS and the SSS are located on consecutive k3 radio frames, and are received in a period of T5 radio frames, T5 ⁇ k3;
- k1, k2, k3, T1, T2, T3, T4, and T5 are all positive integers.
- the storage medium is further arranged to store program code for performing the following steps:
- the OFDM symbol corresponding to the synchronization signal does not receive a reference signal
- the reference signal is received only on the first q OFDM symbols, and q is a positive integer.
- the storage medium is further arranged to store program code for performing the following steps:
- the synchronization signal includes a plurality of sequences that are generated based on cell identification and/or timing information during a repetition period.
- the storage medium is further arranged to store program code for performing the following steps:
- Each OFDM symbol included in the synchronization signal corresponds to one sequence in one repetition period
- the plurality of OFDM symbols included in the synchronization signal correspond to one sequence, wherein each of the OFDM symbols corresponds to a subsequence of the sequence;
- Each of the plurality of subframes corresponds to one sequence on a plurality of subframes within one repetition period.
- the base station repeatedly transmits the synchronization signal to the terminal period; in a repetition period, the synchronization signal is sent at a time corresponding to the OFDM symbols of the multiple orthogonal frequency division multiplexing technologies on one or more subframes, where
- the synchronization signal is the primary synchronization signal PSS or the secondary synchronization signal SSS, or the terminal periodically repeats the synchronization signal sent by the base station, which solves the problem that the synchronization signal design is unreasonable in the narrowband system of LTE, and realizes the synchronization signal of the narrowband system.
- Reasonable transmission is the problem that the synchronization signal design is unreasonable in the narrowband system of LTE, and realizes the synchronization signal of the narrowband system.
- FIG. 1 is a flow chart 1 of a method for transmitting a synchronization signal according to an embodiment of the present invention
- FIG. 2 is a second flowchart of a method for transmitting a synchronization signal according to an embodiment of the present invention
- FIG. 3 is a block diagram 1 of a structure of a synchronization signal transmission apparatus according to an embodiment of the present invention.
- FIG. 4 is a block diagram 2 of a structure of a synchronization signal transmission apparatus according to an embodiment of the present invention.
- FIG. 5 is a schematic diagram of reference symbols continuously occupied by PSS/SSS in accordance with a preferred embodiment of the present invention.
- FIG. 6 is a schematic diagram of reference symbols for discontinuous occupancy of PSS/SSS in accordance with a preferred embodiment of the present invention.
- FIG. 7 is a schematic diagram of REs corresponding to ZC sequences in accordance with a preferred embodiment of the present invention.
- FIG. 1 is a flowchart 1 of a method for transmitting a synchronization signal according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps:
- Step S102 the base station acquires a synchronization signal
- Step S104 The base station repeatedly sends a synchronization signal to the terminal period.
- the synchronization signal is sent at a time corresponding to multiple orthogonal frequency division multiplexing (OFDM) symbols of the one or more subframes, and the synchronization signal is The primary synchronization signal PSS or the secondary synchronization signal SSS.
- OFDM orthogonal frequency division multiplexing
- the base station repeatedly transmits the synchronization signal to the terminal period; in one repetition period, the synchronization signal is transmitted at a time corresponding to the OFDM symbols of the multiple orthogonal frequency division multiplexing technologies on one or more subframes, the synchronization signal It is the primary synchronization signal PSS or the secondary synchronization signal SSS, which solves the problem that the synchronization signal design is unreasonable in the narrowband system of LTE, and realizes the reasonable transmission of the synchronization signal of the narrowband system.
- step S102 is optional, and the solution in this embodiment may include only step S104.
- the multiple OFDM symbols include consecutive multiple OFDM symbols in the one subframe, or
- the multiple OFDM symbols are symbols in a preset set, and the set includes a third OFDM symbol, a fourth OFDM symbol, and a last two of each slot. OFDM symbol.
- the PSS is located in consecutive k1 radio frames, and is sent in a period of T1 radio frames, T1 ⁇ k1, and the SSS is sent in a period of T2 radio frames, or
- the PSS is sent in a period of T3 radio frames, and the SSS is located in consecutive k2 radio frames, and is transmitted in a period of T4 radio frames, T4 ⁇ k2, or
- the PSS and the SSS are located on consecutive k3 radio frames, and are transmitted in a period of T5 radio frames, T5 ⁇ k3;
- k1, k2, k3, T1, T2, T3, T4, and T5 are all positive integers.
- the synchronization signal includes M OFDM symbols in one repetition period, and the subcarrier spacing of the mth OFDM symbol is 15/A m KHz, where 1 ⁇ m ⁇ M, m, M, and A m Both are positive integers.
- the subcarrier spacing is 7.5 KHz
- the OFDM symbol corresponds to 2 consecutive OFDM symbols
- the 2 consecutive OFDM symbols include one of the following:
- the subcarrier spacing is 3.75 KHz, and the OFDM symbol corresponds to 4 consecutive OFDM symbols.
- the reference signal is not sent on the OFDM symbol corresponding to the synchronization signal, or
- the reference signal is transmitted only on the first q OFDM symbols, and q is a positive integer.
- the synchronization signal includes a plurality of sequences that are generated based on cell identification and/or timing information during a repetition period.
- the synchronization signal includes a plurality of sequences including, in one repetition period,
- Each OFDM symbol included in the synchronization signal corresponds to one sequence in one repetition period
- the plurality of OFDM symbols included in the synchronization signal correspond to a sequence, where the OFDM symbol corresponds to a subsequence of the sequence;
- Each of the plurality of subframes corresponds to one sequence on a plurality of subframes within one repetition period.
- the sequence is determined by the OFDM symbol corresponding to the sequence.
- the synchronizing signal is transmitted at a time corresponding to the OFDM symbols of the multiple orthogonal frequency division multiplexing technologies on the one or more subframes, including:
- the synchronization signal is transmitted at times corresponding to m OFDM symbols, where m ⁇ ⁇ 5, 6, 7, 8, 10, 12 ⁇ .
- the time corresponding to the multiple OFDM symbols includes two parts, and each part of the two parts corresponds to one sequence, and the two parts include:
- the two parts are divided into two parts in chronological order, or,
- the two parts are the time corresponding to the OFDM symbol of the odd index and the time corresponding to the OFDM symbol of the even index; wherein the index is an index after the OFDM symbol corresponding to the synchronization signal is renumbered from 0 in chronological order.
- the value of s(k 0 ) is the CRS symbol value corresponding to subcarrier #k 0 .
- FIG. 2 is a second flowchart of a method for transmitting a synchronization signal according to an embodiment of the present invention. As shown in FIG. 2, the process includes the following steps:
- Step S202 The terminal periodically repeats receiving the synchronization signal sent by the base station, and the synchronization signal is received at a time corresponding to the OFDM symbols of the multiple orthogonal frequency division multiplexing technologies on one or more subframes in a repetition period, the synchronization signal Is a primary synchronization signal PSS or a secondary synchronization signal SSS;
- step S204 the terminal determines the synchronization signal.
- the terminal periodically repeats receiving the synchronization signal sent by the base station, and the synchronization signal is received at a time corresponding to the OFDM symbols of the multiple orthogonal frequency division multiplexing technologies on one or more subframes in a repetition period, the synchronization
- the signal is the primary synchronization signal PSS or the secondary synchronization signal SSS, which solves the problem that the synchronization signal design is unreasonable in the narrowband system of LTE, and realizes the reasonable transmission of the synchronization signal of the narrowband system.
- step S204 is optional, and the solution in this embodiment may include only step S202.
- the multiple OFDM symbols include consecutive multiple OFDM symbols in the one subframe, or
- the plurality of OFDM symbols are symbols in a preset set, and the set includes a third OFDM symbol, a fourth OFDM symbol, and a last two of each slot. OFDM symbol.
- the PSS is located in consecutive k1 radio frames, and is received in a period of T1 radio frames, where T1 ⁇ k1, and the SSS is received in a period of T2 radio frames, or
- the PSS is received in a period of T3 radio frames, and the SSS is located in consecutive k2 radio frames, and is received in a period of T4 radio frames, T4 ⁇ k2, or
- the PSS and the SSS are located on consecutive k3 radio frames, and are received in a period of T5 radio frames, T5 ⁇ k3;
- k1, k2, k3, T1, T2, T3, T4, and T5 are all positive integers.
- the synchronization signal includes M OFDM symbols in one repetition period, and the subcarrier spacing of the mth OFDM symbol is 15/A m KHz, where 1 ⁇ m ⁇ M, m, M, and A m Both are positive integers.
- the subcarrier spacing is 7.5 KHz
- the OFDM symbol corresponds to 2 consecutive OFDM symbols
- the 2 consecutive OFDM symbols include one of the following:
- the subcarrier spacing is 3.75 KHz, and the OFDM symbol corresponds to 4 consecutive OFDM symbols.
- the OFDM symbol corresponding to the synchronization signal does not receive the reference signal
- the reference signal is received only on the first q OFDM symbols, and q is a positive integer.
- the synchronization signal includes a plurality of sequences that are generated based on cell identification and/or timing information during a repetition period.
- the synchronization signal includes a plurality of sequences including, in one repetition period,
- Each OFDM symbol included in the synchronization signal corresponds to one sequence in one repetition period
- the plurality of OFDM symbols included in the synchronization signal correspond to a sequence, where the OFDM symbol corresponds to a subsequence of the sequence;
- Each of the plurality of subframes corresponds to one sequence on a plurality of subframes within one repetition period.
- each OFDM symbol included in the synchronization signal corresponds to one sequence in one repetition period.
- each OFDM symbol included in the synchronization signal corresponds to a ZC sequence of length 11; wherein the carrier corresponding to the synchronization signal includes 12 subcarriers.
- the sequence is determined by the OFDM symbol corresponding to the sequence.
- the receiving, by the synchronization signal, the time corresponding to the OFDM symbols of the multiple orthogonal frequency division multiplexing technologies on the one or more subframes includes:
- the synchronization signal is received at times corresponding to m OFDM symbols, where m ⁇ ⁇ 5, 6, 7, 8, 10, 12 ⁇ .
- the time corresponding to the multiple OFDM symbols includes two parts, and each part of the two parts corresponds to one sequence, and the two parts include:
- the two parts are divided into two parts in chronological order, or,
- the two parts are the time corresponding to the OFDM symbol of the odd index and the time corresponding to the OFDM symbol of the even index; wherein the index is an index after the OFDM symbol corresponding to the synchronization signal is renumbered from 0 in chronological order.
- the value of the PSS or SSS sequence, s(k 0 ) is the CRS symbol value corresponding to subcarrier #k 0 .
- the location of the synchronization signal is determined by at least one of:
- the frequency domain position corresponding to the synchronization signal is either a PRB index or a frequency offset.
- the synchronization signal when the cell identifier is X, the synchronization signal is located on the last N subcarriers of the physical resource block where the synchronization signal is located, and when the cell identifier is Y, the synchronization The signal is located on the first N subcarriers of the physical resource block in which the synchronization signal is located, where N is a positive integer.
- the cell identifier X satisfies mod(X, 3) equal to 0, the cell identifier Y satisfies mod(Y, 3) is not equal to 0; or the cell identifier Y satisfies mod (Y, 3) Is equal to 2, the cell identifier X satisfies mod(X, 3) not equal to 2;
- the cell identifier X satisfies mod(X,6) equal to 0, the cell identifier Y satisfies mod(Y,6) is not equal to 0; or the cell identifier Y satisfies mod(Y,6) equal to 5,
- the cell identifier X satisfies mod(X, 6) not equal to 5.
- the root index of the ZC sequence is grouped, and the manner of the grouping includes at least one of the following:
- sequences of the second group and the third group are interchangeable.
- the first group of ZC sequences are mapped onto a first OFDM symbol
- the second group of ZC sequences are mapped to a second OFDM symbol
- the third group of ZC sequences are mapped to a third OFDM symbol.
- the first OFDM symbol includes a symbol numbered ⁇ 5, 6, 9, 10, 12, 13 ⁇ in a subframe
- the second OFDM symbol includes a number ⁇ 3, 4 ⁇ in the subframe.
- the third OFDM symbol includes symbols numbered ⁇ 7, 8 ⁇ in the subframe, wherein the symbol number in the subframe starts from 0.
- the synchronization signal uses the same ZC sequence used on the last OFDM symbol in the subframe as the ZC sequence used on the last OFDM symbol in the subframe; or, with the second slot first
- the OFDM symbols use the same ZC sequence; or, the same as the ZC sequence used by the last OFDM symbol of the first slot; or the same ZC sequence used by the first OFDM symbol of the synchronization signal in the subframe.
- the root index of the sequence corresponding to the OFDM symbol included in the chronological order is one of the following:
- the root index of the sequence corresponding to the OFDM symbol included in the chronological order is one of the following:
- a synchronization signal transmission device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again.
- the term “module” may implement a combination of software and/or hardware of a predetermined function.
- the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
- FIG. 3 is a block diagram of a structure of a synchronization signal transmission apparatus according to an embodiment of the present invention. It is located on the base station side. As shown in FIG. 3, the apparatus includes:
- the obtaining module 32 is configured to acquire a synchronization signal
- the sending module 34 is configured to repeatedly send the synchronization signal to the terminal period, and the synchronization signal is sent at a time corresponding to the OFDM symbols of the multiple orthogonal frequency division multiplexing technologies on one or more subframes in a repetition period, the synchronization
- the signal is a primary synchronization signal PSS or a secondary synchronization signal SSS.
- the obtaining module 32 is configured to acquire a synchronization signal
- the transmitting module 34 is configured to repeatedly transmit the synchronization signal to the terminal period, and the plurality of orthogonal frequency divisions of the synchronization signal in one or more subframes in one repetition period
- the signal is transmitted at a time corresponding to the technical OFDM symbol
- the synchronization signal is a primary synchronization signal PSS or a secondary synchronization signal SSS, which solves the problem that the synchronization signal design is unreasonable in the narrowband system of LTE, and realizes the reasonable transmission of the synchronization signal of the narrowband system.
- the transmission mode of the synchronization signal of the apparatus is the same as that of the above embodiment.
- the obtaining module 32 is optional.
- the solution in this embodiment may include only the sending module 34.
- FIG. 4 is a block diagram 2 of a structure of a synchronization signal transmission apparatus according to an embodiment of the present invention, which is located on a terminal side, as shown in FIG. 4, the apparatus includes:
- the receiving module 42 is configured to periodically receive the synchronization signal sent by the base station, and the synchronization signal is received at a time corresponding to the OFDM symbols of the multiple orthogonal frequency division multiplexing technologies on one or more subframes in a repetition period, where
- the synchronization signal is a primary synchronization signal PSS or a secondary synchronization signal SSS;
- a determination module 44 is arranged to determine the synchronization signal.
- the receiving module 42 is configured to periodically receive the synchronization signal sent by the base station, and the synchronization signal is in a time corresponding to the OFDM symbols of the multiple orthogonal frequency division multiplexing technologies on one or more subframes in one repetition period.
- the synchronization signal is a primary synchronization signal PSS or a secondary synchronization signal SSS, which solves the narrowband system in LTE, and the synchronization signal The problem of unreasonable design of the number realizes the reasonable transmission of the synchronization signal of the narrowband system.
- the transmission mode of the synchronization signal of the apparatus is the same as that of the above embodiment.
- the determining module 44 is optional, and the solution in this embodiment may include only the receiving module 42.
- the preferred embodiment provides a method of transmitting a synchronization signal, which is a primary synchronization signal PSS or a secondary synchronization signal SSS.
- the synchronization signal is repeatedly transmitted periodically, such as a repetition period of 20 ms or 40 ms or 60 ms or 80 ms.
- the repetition period of PSS and SSS may be the same or different.
- the transmission period of the PSS is 80 ms, which is sent in one or more subframes
- the transmission period of the SSS is 20 ms, which is transmitted in one or more subframes.
- a timing of 80 ms can be obtained by receiving the PSS.
- the period of the transmission may also be non-uniform.
- the PSS is located in consecutive k1 radio frames, and is transmitted in a period of T1 radio frames, T1 ⁇ k1, and the SSS is sent in a period of T2 radio frames.
- T1>k1 the PSS can be considered to be transmitted in an uneven period.
- the PSS is sent in a period of T3 radio frames, where the SSS is located in consecutive k2 radio frames, and is transmitted in a period of T4 radio frames, T4 ⁇ k2, or the PSS and the SSS are located in consecutive k3 radios.
- T5 ⁇ k3 is transmitted in a period of T5 radio frames, wherein k1, k2, k3, T1, T2, T3, T4, and T5 are all positive integers.
- PSS or SSS is sent in the first 40ms of 80ms, and it is sent every 10ms in the first 40ms, and PSS or SSS is not sent after 40ms.
- the UE can obtain the timing of 80 ms according to the large period, thereby saving the indication bit number of the system frame number in the MIB.
- the resources occupied by the PSS/SSS in one repetition period are as follows.
- the PSS/SSS can occupy one subframe or multiple subframes in one repetition period.
- the PSS/SSS can be sent in consecutive or discontinuous subframes if the transmitted subframe is a Multicast/Multicast Single Frequency Network (MBSFN) subframe and has many physical The broadcast channel (Physical Multicast Channel, PMCH for short) is sent, and the PSS/SSS information is destroyed. Or the transmit subframe of the PSS/SSS may be selected on the subframes 0, 4, 5, and 9 to avoid the influence of the MBSFN subframe.
- MBSFN Multicast/Multicast Single Frequency Network
- the PSS/SSS may be located in subframes 4 and 5 of one radio frame, or in subframe 9 of one radio frame and subframe 0 of the next radio frame.
- the PSS/SSS occupies multiple OFDM symbols in time, where the OFDM symbol is a symbol defined in the existing LTE, for example, for a normal CP, a 1 ms subframe is divided into two 0.5 ms.
- the time slot and the index of the time slot are 0 and 1, respectively, and may also be referred to as a first time slot and a second time slot.
- Each time slot contains 7 symbols, and the indexes are 0 to 6, respectively, which may also be referred to as a first symbol, a second symbol, ..., a seventh symbol; for an extended CP, a 1 ms subframe is also divided into Two 0.5ms time slots, the index of which is 0 and 1, respectively, may also be referred to as the first time slot and the second time slot.
- Each time slot contains 6 symbols, and the indexes are 0 to 5, which may also be referred to as a first symbol, a second symbol, ..., The sixth symbol.
- this OFDM symbol is referred to as a reference symbol.
- the PSS/SSS can occupy consecutive reference symbols or can occupy reference symbols without CRS transmission.
- 5 is a schematic diagram of reference symbols continuously occupied by PSS/SSS according to a preferred embodiment of the present invention
- FIG. 6 is a schematic diagram of reference symbols of discontinuous occupancy of PSS/SSS according to a preferred embodiment of the present invention, as shown in FIGS. 5 and 6. Shown, two examples of reference symbols occupied by PSS/SSS are given, Figure 5 is continuous occupancy, and Figure 6 is non-continuous occupancy.
- the reference symbols used to transmit the synchronization signal are symbols in the following set: the third, fourth reference symbols and the last two reference symbols of each time slot. Since the third symbol of the slot whose index is even is generally used for the transmission of the PDCCH, it is preferable that the third symbol of the slot whose index is even is not included.
- the fourth symbol of each slot is a CRS, and therefore, preferably, the fourth symbol of each slot is not included.
- the number of reference symbols used to transmit the synchronization signal is one of 5, 6, and 7.
- the number of reference symbols used to transmit the synchronization signal may also be one of 8, 10, 12.
- the synchronization signal can be transmitted on an MBSFN subframe. Alternatively, it can be sent in a subframe of a standalone scene.
- the reference signal should be marked with the PSS/SSS symbol.
- the reference signal includes CRS, CSI-RS, PRS, DMRS, and the like.
- the number of symbols occupied by the PSS and the SSS may be the same or different.
- the number of subframes occupied by the PSS and the SSS may be the same or different. For example, the PSS occupies one subframe, and the SSS occupies two subframes.
- the CRS is not sent on the reference symbol where the synchronization signal is located.
- the index is 0 to 13
- the synchronization signal occupies the reference symbols #5 to 13, so that the CRS is not transmitted on the reference symbols #5 to 13.
- the reference signal is transmitted only on the first q reference symbols, and q is a preset positive integer.
- q 1 or 2.
- the signal form of PSS/SSS includes:
- the subcarrier spacing of the PSS/SSS transmission may be less than 15 kHz, that is, different from the existing LTE subcarrier spacing.
- the subcarrier spacing of the M OFDM symbols may be the same or different.
- the PSS/SSS includes a total of 2 OFDM symbols, the first OFDM symbol subcarrier spacing is 15 kHz, and is transmitted on the reference symbol #4 of the first slot, and the second OFDM symbol subcarrier spacing is 7.5 kHz.
- the first time slot is transmitted on reference symbols #5, 6.
- the subcarrier spacing is 15 kHz, and the OFDM symbol corresponds to one reference symbol.
- the subcarrier spacing is 7.5 KHz
- the OFDM symbol corresponds to 2 consecutive reference symbols, that is, an OFDM symbol with a subcarrier spacing of 7.5 KHz is transmitted over the duration of two consecutive reference symbols.
- the two reference symbols are one of: the third and fourth symbols of each time slot, or the last two symbols of each time slot. If the third symbol of the slot with an even index is considered for transmission of the PDCCH, the third and fourth symbols of the slot with an even index should not be included.
- there is a CRS on the fourth symbol of each slot so the OFDM symbol only corresponds to the last two symbols of each slot.
- the OFDM symbol corresponds to 4 consecutive reference symbols.
- the OFDM symbol is transmitted on an MBSFN subframe.
- the synchronization signal includes a plurality of sequences that are generated based on cell identification and/or timing information.
- a specific generation method will be given in the following embodiments.
- each OFDM symbol included in the PSS/SSS corresponds to a complete sequence, for example, within one repetition period, the PSS/SSS includes 4 OFDM symbols, and each symbol corresponds to a complete sequence, or
- the synchronization signal comprises a plurality of OFDM symbols corresponding to a complete sequence, wherein the each OFDM symbol corresponds to a subsequence of the complete sequence, for example, within one repetition period, the PSS/SSS includes 8 OFDM Symbol, 4 symbols correspond to a complete sequence, the complete sequence is divided into 4 segments, each segment corresponds to a symbol, or,
- each subframe corresponds to a sequence.
- the mapping relationship between resources and sequences occupied by PSS/SSS in a repetition period includes:
- the time corresponding to the reference symbol is divided into two parts, and each part corresponds to a complete sequence.
- the two parts may be divided into two parts according to chronological order. For example, when the synchronization signal is transmitted at a time corresponding to 5 reference symbols, a part includes the time corresponding to the first 3 reference symbols, and a part includes the remaining 2 reference symbols. time. Alternatively, the reference symbol of the slot whose index is even is part, and the reference symbol of the slot whose index is odd is another part. For the case where the synchronization signal is transmitted at a time corresponding to 5 or 7 reference symbols, each sequence may occupy a part of the frequency domain on the middle reference symbol.
- the two parts are respectively the time corresponding to the reference symbol of the odd index and the time corresponding to the reference symbol of the even index.
- the index is an index obtained by re-numbering the reference symbols corresponding to the synchronization signal from 0 in chronological order. For example, when the synchronization signal is transmitted at the time corresponding to the six reference symbols, the index is 0-5, respectively, then the reference symbols #0, 2, 4 are part, and the remaining symbols are another part.
- the reference symbol of the CRS is a part, and the remaining reference symbols are another part. That is, a portion including the first, second, and third-to-last symbols of each time slot is one or more of a portion, and the other portion includes one or more of the remaining reference symbols.
- This embodiment provides a transmission method of PSS.
- the PSS may occupy one subframe, or multiple subframes.
- the PSS may be located in subframes 4 and 5 of one radio frame, or in subframe 9 of one radio frame and the sub-frame of the next radio frame.
- the PSS is located on a plurality of reference symbols, and the multiple reference symbols may be located on one subframe or on multiple subframes.
- the PSS occupies n(n>1) reference symbols in one subframe in one repetition period; or, the PSS occupies multiple subframes in one repetition period, and each subframe occupies one or more reference symbols, and each subframe
- the number of reference symbols occupied on the same may be the same or different.
- the reference symbols available for the PSS in one subframe are reference symbols 3 on the slot with an even index.
- the reference symbols available for the PSS in one subframe are the reference symbols 2, 4, 5 on the slot with an even index and the odd index. Reference symbols 2, 3, 5, 6 on the gap. Synchronization performance can be improved because there is no interference from CRS. Or the PSS can also be located on the reference symbol where the CRS is located. At the location where the CRS is sent, the PSS symbol is removed and the CRS is sent.
- the eNB may configure the subframe in which the PSS is transmitted as an MBSFN subframe, so that the interference of the CRS on the synchronization channel may be reduced.
- the PSS in one repetition period, includes M OFDM symbols, and the subcarrier spacing of the mth (1 ⁇ m ⁇ M) OFDM symbols is 15/A m KHz, where A m is a positive integer
- a m 1, 2, 3, 4, 5, 6.
- Each/multiple OFDM symbols correspond to one sequence, and the sequence may be a ZC sequence, or an m sequence, or an M sequence, or a wash sequence, this embodiment No restrictions.
- each subcarrier may have a width of 7.5 kHz, then a total of 24 subcarriers, then a ZC sequence of 23, or a ZC sequence of 24, or a ZC sequence of 25 may be used according to a preset rule.
- a sequence of lengths of 24 obtained by one symbol is not limited to these values in practical applications.
- the ZC sequence is generated in the frequency domain, the symbol corresponding to the DC position is deleted, for example, the sequence length is 11, and the most middle symbol is destroyed.
- the OFDM symbol corresponding sequences of the PSS may be the same or different.
- the PSS contains a sequence and a conjugate of the sequence.
- the sequence on the first 4 symbols is s
- the sequences on the last 4 symbols are conjugates of s.
- the first 4 symbols correspond to a long sequence, such as a length of 47, and the last 4 symbols are also 47 in length, corresponding to the conjugate of the long sequence.
- the transmission sequence of the PSS can be the same, that is, the PSS is only used for timing, and no other information is transmitted. Or PSS can carry some information.
- the PSS can be used to indicate partial cell identification information, such as among them, For the community identity, The value ranges from 0 to 167. The value ranges from 0 to 2.
- the three ZC sequences are ZC1, ZC2 and ZC3, respectively.
- the ZCi is sent on the n symbols of the transmitting PSS.
- the root sequences of the three different ZC sequences may be different, or the root sequences may be identical or partially identical, but the cyclic shifts corresponding to the same root sequence are different.
- sequences on every 3 symbols is the same, and there are 3 sequences, which are ZC1, ZC2, and ZC3, respectively.
- the order of the sequences on the 9 symbols is ZC1 (first 3 symbols), ZC2 (3 symbols in the middle), and ZC3 (last 3 symbols);
- the order of the sequences on the 9 symbols is ZC2 (first 3 symbols), ZC3 (3 symbols in the middle), and ZC1 (last 3 symbols);
- the order of the sequences on the nine symbols is ZC3 (first 3 symbols), ZC1 (3 symbols in the middle), and ZC2 (last 3 symbols).
- This embodiment provides a transmission method of an SSS.
- the SSS is repeatedly sent.
- the repetition period of the SSS is preset, for example, 20ms or 40ms or 60ms. In practical applications, it is not limited to these periodic values.
- the SSS may be located on multiple reference symbols, such as reference symbols that do not include a CRS, for example, for a normal CP, except for the first three possible reference symbols that may be used for the PDCCH, one subframe may be used.
- the reference symbols of the SSS are reference symbols 3, 5, 6 on the even-numbered time slots and reference symbols 2, 3, 5, 6 on the odd-numbered time slots.
- the reference symbols available for the SSS in one subframe are the reference symbols 2, 4, 5 on the slot with an even index and the odd index. Reference symbols 2, 3, 5, 6 on the gap. Synchronization performance can be improved because there is no interference from CRS.
- the SSS may also be located on the reference symbol where the CRS is located. At the location where the CRS is sent, the SSS reference symbol is discarded and the CRS is sent.
- the PSS on each OFDM symbol is a sequence, and the sequence may be a ZC sequence, or an m sequence, or an M sequence, or a wash sequence, this embodiment No restrictions.
- the subcarrier spacing of the PSS is the same as that of the existing LTE, that is, the subcarrier spacing is 15 kHz, which is not limited to such subcarrier spacing in practical applications.
- each symbol transmits a sequence, which may be a ZC sequence or an m sequence, preferably a ZC sequence.
- a sequence which may be a ZC sequence or an m sequence, preferably a ZC sequence.
- multiple OFDM symbols may also correspond to one sequence, which is not limited in the present invention.
- the SSS is sent on six reference symbols in one subframe, corresponding to six ZC sequences, or sent on 12 reference symbols in two consecutive subframes, corresponding to 12 ZC sequences, and the actual application is not limited to this. value.
- Different cell identification information and timing information are indicated by M ZC sequences.
- the timing information is exemplified.
- the ZC sequence is sent in a period of 20 ms, and the timing information can be used to indicate location information of the current 20 ms in 80 ms, for example, by using 2 bits, so that the UE can receive the SSS. Get a timing of 80ms.
- the value of the cell identifier in the LTE range is 0 to 503. If all the SSS indications usually require 9 bits to indicate, and the timing 2 bits information is added, the SSS needs to indicate 11 bits of information.
- the M OFDM symbols correspond to M sequences without loss of generality, assuming that it is 6 ZC sequences, as follows:
- N zc 11 is the length of the ZC sequence
- u i ⁇ 1,2,...,N zc -1 ⁇ is the root sequence index of the ZC sequence on the ith symbol.
- Cell identification and/or timing information can therefore be indicated by a combination of (u 1 , u 2 , ..., u 6 ).
- the combination of (u 1 , u 2 , . . . , u 6 ) is sufficient to indicate 11 bit information.
- the set of u i may also be a subset of the set ⁇ 1, 2, ..., N zc -1 ⁇ .
- the SSS is only used to indicate cell identification information.
- the SSS includes six ZC sequences, and there are three root sequence indexes in the set of u i , which are renumbered as indexes 0, 1, and 2, then the six ZC sequences can be It is used to indicate the 6-th power state of 3, that is, 729 states, and thus is sufficient for indicating the cell identity. Then the cell identity satisfies the following formula:
- w i is the index of the root sequence of the ZC sequence on the i+1th symbol, and the value is 0, 1, 2.
- a root sequence and a cyclic shift joint indication may be used, for example, (u 1 , CS 1 , u 2 , CS 2 , . . . , u 6 , CS 6 ) jointly indicate cell identification and timing information.
- CS 1 , CS 2 ... CS 6 are cyclic shift values of the ZC sequence on the i-th symbol of the six symbols, respectively.
- the SSS is a sequence, such as occupying multiple reference symbols.
- the long sequence is transmitted on multiple reference symbols after being segmented in the time domain, and the subcarrier spacing is 15 kHz. Information is indicated by a long sequence design on these two sub-frames. The details will be described below.
- each subframe occupies 6 reference symbols, a total of 72 REs, and the SSS is a ZC sequence of 71, as follows
- the cell identity satisfies the following formula:
- w i is an index of the root sequence of the ZC sequence on the i+1th subframe of the two subframes, and the values are 0, 1, 2, ... 69.
- the root sequence and the cyclic shift joint indication may also be used, for example, using (u 1 , CS 1 , u 2 , CS 2 ) to jointly indicate the cell identity and timing information.
- CS 1 and CS 2 are cyclic shift values of the ZC sequence on the i-th subframe of the two subframes, respectively.
- the SSS may include one or more sequences, where each sequence may be generated by a plurality of sub-sequences, with different mapping positions of the plurality of sub-sequences to indicate information.
- each sequence of the SSS is generated, for example, by two sequences, which are s 0 (n) and s 1 (n), respectively.
- n f is the radio frame index
- the sequence transmitted is as shown in equation (1)
- the sequence transmitted at the radio frame 4n+2 is as in equation (2).
- a timing of 40 ms can be obtained.
- s 0 (n) and s 1 (n) may be generated according to a cell identifier, such as a cell identifier and a root sequence of the ZC sequence and a cyclic shift one-to-one correspondence.
- the PSS/SSS symbol is removed.
- the power of the PSS/SSS transmission sequence is the same as the CRS.
- This embodiment provides a method for transmitting a synchronization signal.
- the synchronization signal is composed of multiple OFDM sequences, and each OFDM symbol corresponds to one sequence.
- the OFDM symbol occupied by the synchronization signal is an OFDM symbol in an existing LTE system, that is, a symbol having a subcarrier width of 15 kHz.
- sequence length Assuming a sequence length of 11, there are a total of 10 available sequences. In practical applications, the sequence length is not limited. Assuming that the available sequence is a ZC sequence, as shown below,
- N is the sequence length, where the value is 11, and u is the root sequence index, which is an integer from 1 to 10.
- the root index has poor performance against the frequency offset on both sides, and the anti-frequency offset performance in the middle is better, that is, the anti-frequency offset performance ranks the root sequence index as:
- i is less than Positive integers, the two root sequences in parentheses perform similarly.
- the sequence of anti-frequency preferences is placed on symbols without CRS.
- a sequence of anti-frequency preferences is placed on two physically adjacent symbols without CRS. For example, the last two symbols of a time slot in an LTE subframe. Not limited to this example.
- a conventional CP is used, and there are 14 symbols in one subframe, which are sequentially numbered 0, 1, 2, 3, ..., 13. in chronological order.
- the index of the symbol with CRS is 0, 1, 4, 7, 8. 11, the rest are symbols without CRS. It is assumed that the synchronization signal occupies the last 11 symbols. In actual applications, the number of symbols and the position are not limited.
- the sequence with better frequency offset performance is placed, that is, the root sequence index placed on each of the symbols #5, 6, 9, 10, 12, 13 is 5, 6
- the symbol and the root sequence index are in one-to-one correspondence, and the correspondence relationship is not limited.
- the sequence of the root sequence index of 5 is transmitted on symbol #5, and the root sequence index of symbol #6 is 6
- the sequence, the sequence of the transmission root sequence index of 4 on symbol #9, the sequence of the root sequence index of 7 on symbol #10, the sequence of the root sequence index of 3 on symbol #12, and the root sequence index of symbol #13 A sequence of 8.
- An example is the 11 symbols, that is, the root sequence indexes corresponding to the symbols #3 to 13 are sequentially 2, 9, 3, 8, 1, 10, 4, 7, 5, 6, and 5.
- Table 1 gives a few Examples of the root sequence index are not limited to the following examples in practice.
- root sequence index on the 11 symbols is one of the following in chronological order:
- adjacent symbols correspond to a pair of conjugate sequences, ie Where i is less than Positive integer.
- i is less than Positive integer.
- Table 1 the symbols #3 and 4 in Table 1 above correspond to 2 and 9, respectively, and the order may be adjusted in practical applications, corresponding to 9 and 2, or may also correspond to other conjugate sequences, such as 5 and 6.
- adjacent symbols without CRS correspond to a pair of conjugate sequences.
- the 11 symbols correspond to 10 different root sequences, and the sequence on one symbol is the same as the sequence on other symbols, and is referred to as a repeated sequence in the present invention.
- the sequence on the third last symbol is identical to the sequence on the other symbols.
- the repeating sequence is one of the best sequences against frequency offset performance, such as one of the.
- the repeating sequence is the sequence on the last symbol, or the sequence on the first symbol, or the sequence on the first symbol on the second time slot, or the second time slot A sequence on three symbols.
- the synchronization signal occupies the last 9 OFDM symbols, and has the symbol of CRS.
- the index is 0, 1, 3, 6, 7, 9, and the rest are symbols without CRS.
- the sequence with better frequency offset performance is placed, that is, the root sequence index placed on each of the symbols #4, 5, 10, 11 is 5, 6, 4, 7 one of the.
- One symbol in the sequence and the root sequence index are in one-to-one correspondence, and the correspondence relationship is not limited.
- the sequence of the transmission root sequence index of 5 on symbol #4 and the sequence of the root sequence index of 6 on symbol #5 are transmitted on symbol #10.
- the root sequence indexes corresponding to the nine symbols are 1, 5, 6, 2, 9, 3, 8, 4, and 7, respectively.
- Table 2 some examples are given, and the practical examples are not limited to the following examples.
- root sequence index on the nine symbols is one of the following in chronological order:
- the nine symbols correspond to nine different root sequences, and the corresponding root sequences are different on each symbol, corresponding to the nine root sequences with the best frequency offset, and the nine different root sequences are Except for the 9 root sequences whose index is 1, or 9 root sequences except the index 9.
- the sequence pair of anti-frequency preferences is placed on the symbol with the CRS.
- the root sequence indexes corresponding to the 11 symbols are 4, 7, 1, 10, 5, 6, 2, 9, 8, 3, 8, respectively, and the extended CPs 6, 1, 10, 4, 7, 3, 8, 2, 9.
- sequences are grouped and the sequences to be protected are placed on symbols without CRS.
- the sequence to be protected may be a sequence that is strong against frequency, or may be a sequence that is weak against frequency.
- the symbol without the CRS in which the sequence to be protected is located may be arbitrarily selected.
- the root index of the ZC sequence is grouped, and the specific grouping manner includes at least one of the following:
- the third group
- the third group
- the first set of ZC sequences are mapped onto a first OFDM symbol
- the second set of ZC sequences are mapped onto a second OFDM symbol
- the third set of ZC sequences are mapped onto a third OFDM symbol
- the An OFDM symbol includes a symbol with an index number of ⁇ 5, 6, 9, 10, 12, 13 ⁇ in a subframe
- the second OFDM symbol includes a number ⁇ 3, 4 ⁇ in the subframe
- the third OFDM symbol Includes symbols with indices ⁇ 7, 8 ⁇ in the sub-frame.
- the last 11 symbols of one subframe are used to transmit the synchronization signal.
- the root sequence index of the sequence corresponding to the 11 symbols may be sequentially cyclic, that is, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, x.
- x can be any one of any of 1 to 10.
- the root index x of the sequence on the last symbol can be 1 or 5 or 6.
- sequence on the symbol may be end-to-tail conjugated, such as 1, 2, 3, 4, 5, x, 6, 7, 8, 9, 10.
- x can be any one of any of 1 to 10.
- x can be 1 or 5 or 6.
- the sequence on the adjacent symbol is conjugate, and the repeated sequence is on the most middle symbol, such as 1, 10, 2, 9, 3, x, 8, 4, 7. , 5, 6.
- x is a repeating sequence, on the symbol in the middle of a pair of conjugated sequences.
- the sequence x on the last symbol can be 1 or 5 or 6.
- the sequence on the symbol corresponds to a pair of conjugate sequences, for example, the root sequence index corresponding to the first five symbols is The root sequence index corresponding to the last 6 symbols is
- the synchronization signal is composed of multiple OFDM sequences, and each OFDM symbol corresponds to one sequence.
- the OFDM symbol occupied by the synchronization signal is an OFDM symbol in an existing LTE system, that is, a symbol having a subcarrier width of 15 kHz.
- the PSS and/or the SSS are transmitted on 11 subcarriers
- the downlink carrier includes 12 subcarriers
- the downlink carrier may be a carrier used by the NB-IoT system to transmit downlink information, and the actual application is not limited to NB-IoT. system.
- This embodiment gives the location of the 11 subcarriers in the downlink carrier.
- the 11 subcarriers are the lowest frequency 11 subcarriers of the 12 subcarriers, or the highest frequency 11 subcarriers of the 12 subcarriers.
- the location of the 11 subcarriers is determined by a cell identifier, and the probability of collision between the synchronization signal and the CRS is reduced.
- the 11 subcarriers are the 11 most frequent subcarriers of the 12 carrier waves.
- the cell identity modulo 3 is 2
- the 11 subcarriers are the lowest of the 12 subcarriers.
- 11 subcarriers are the lowest frequency 11 subcarriers of the 12 subcarriers, or the 11 most subcarriers of the 12 subcarriers.
- the number of REs occupied by the CRS is at most 3.
- FIG. 7 is a schematic diagram of an RE corresponding to a ZC sequence in accordance with a preferred embodiment of the present invention, as shown in FIG. 7, an example is given.
- the "mod" identifier is modulo
- the RE of the dotted portion is an RE with a CRS
- the Nid is a cell identifier.
- the RE corresponding to the ZC sequence is as shown in FIG.
- the 11 subcarriers are 11 subcarriers with the highest frequency among the 12 carrier waves.
- the 11 subcarriers are the lowest of the 12 subcarriers.
- 11 subcarriers are the lowest frequency 11 subcarriers of the 12 subcarriers, or the 11 most subcarriers of the 12 subcarriers.
- the location of the 11 subcarriers is determined by a location of the 12 subcarriers and/or a frequency offset of a center frequency of the 12 subcarriers and an integer multiple of a nearest 100 kHz.
- the position of the 11 subcarriers is determined by the PRB index corresponding to the 12 subcarriers or the frequency offset of the center frequency of the PRB and the nearest multiple of 100 kHz.
- the position of 11 subcarriers in the odd bandwidth is given in Table 3. As shown in Table 3, when the system bandwidth is 5 MHz, if the synchronization signal is transmitted on PRB #17 or 22, the PSS has the lowest frequency in the PRB.
- the 11 subcarriers are transmitted; if the synchronization signal is transmitted on PRB #2 or 7, the PSS is transmitted on the 11 most frequent subcarriers in the PRB.
- the rest of the system has similar bandwidth.
- the receiving PSS may have no fixed frequency offset. For the guard band, it is similar.
- the 11 subcarriers are the highest frequency 11 subcarriers of the 12 subcarriers, when the center of the 12 subcarriers The frequency point is greater than an integer multiple of the nearest 100 kHz, and the 11 subcarriers are the lowest frequency 11 subcarriers among the 12 subcarriers.
- the eNB transmits the 11 long sequence on 11 consecutive subcarriers.
- the sequence value on a certain subcarrier may be destroyed. For example, if the most intermediate sequence value is destroyed, the middlemost subcarriers do not transmit signals among the 11 consecutive subcarriers, and the other 10 subcarriers transmit corresponding signals.
- the sequence value In practice, it is not limited to knocking out the most intermediate sequence values.
- the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
- the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
- the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.
- each of the above modules may be implemented by software or hardware.
- the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.
- Embodiments of the present invention also provide a storage medium.
- the storage medium may be configured to store program code for performing the method steps of the above embodiment:
- the storage medium is further arranged to store program code for performing the method steps of the above-described embodiments:
- the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory.
- ROM Read-Only Memory
- RAM Random Access Memory
- a mobile hard disk e.g., a hard disk
- magnetic memory e.g., a hard disk
- the processor performs the method steps of the foregoing embodiments according to the stored program code in the storage medium.
- modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
- the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
- the invention is not limited to any specific combination of hardware and software.
- the base station repeatedly transmits the synchronization signal to the terminal period; in a repetition period, the synchronization signal is sent at a time corresponding to the OFDM symbols of the multiple orthogonal frequency division multiplexing technologies on one or more subframes, where
- the synchronization signal is the primary synchronization signal PSS or the secondary synchronization signal SSS, or the terminal periodically repeats the synchronization signal sent by the base station, which solves the problem that the synchronization signal design is unreasonable in the narrowband system of LTE, and realizes the synchronization signal of the narrowband system.
- Reasonable transmission is the problem that the synchronization signal design is unreasonable in the narrowband system of LTE, and realizes the synchronization signal of the narrowband system.
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Abstract
Description
符号索引 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
是否有CRS(Y/N) | Y | Y | N | N | Y | N | N | Y | Y | N | N | Y | N | N |
根序列索引(例子1) | 2 | 9 | 3 | 8 | 1 | 10 | 4 | 7 | 5 | 6 | 5 | |||
根序列索引(例子2) | 2 | 9 | 5 | 6 | 1 | 10 | 4 | 7 | 3 | 8 | 3 |
符号索引 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
是否有CRS(Y/N) | Y | Y | N | Y | N | N | Y | Y | N | Y | N | N |
根序列索引(例子1) | 1 | 5 | 6 | 2 | 9 | 3 | 8 | 4 | 7 | |||
根序列索引(例子2) | 10 | 5 | 6 | 2 | 9 | 3 | 8 | 4 | 7 | |||
根序列索引(例子3) | 6 | 5 | 6 | 2 | 9 | 3 | 8 | 4 | 7 |
Claims (37)
- 一种同步信号的传输方法,包括:基站向终端周期重复发送同步信号;在一个重复周期内,所述同步信号在一个或者多个子帧上的多个正交频分复用技术OFDM符号对应的时间上发送,所述同步信号是主同步信号PSS或者辅同步信号SSS。
- 根据权利要求1所述的方法,其中,包括:对于所述一个或者多个子帧中的一个子帧,所述多个OFDM符号包括所述一个子帧中的连续多个OFDM符号,或者,所述同步信号在所述一个或者多个子帧上发送时,所述多个OFDM符号为预设集合中的符号,所述集合包括每个时隙的第三个OFDM符号、第四个OFDM符号和最后两个OFDM符号。
- 根据权利要求1或权利要求2所述的方法,其中,还包括,所述PSS位于连续的k1个无线帧,以T1个无线帧为周期发送,T1≥k1,所述SSS以T2个无线帧为周期发送,或者,所述PSS以T3个无线帧为周期发送,所述SSS位于连续的k2个无线帧,以T4个无线帧为周期发送,T4≥k2,或者,所述PSS和所述SSS位于连续的k3个无线帧上,以T5个无线帧为周期发送,T5≥k3;其中,k1、k2、k3、T1、T2、T3、T4、T5均为正整数。
- 根据权利要求1所述的方法,其中,还包括,在一个重复周期内,所述同步信号包含M个OFDM符号,第m个OFDM符号的子载波间隔为15/AmKHz,其中1≤m≤M,m,M和Am均为正整数。
- 根据权利要求4所述的方法,其中,还包括,当Am=2时,子载波间隔为7.5KHz,所述OFDM符号对应2个连续的OFDM符号,所述2个连续的OFDM符号包括以下之一:一个时隙的第三个OFDM符号和第四个OFDM符号,或者一个时隙的最后两个OFDM符号;当Am=4时,子载波间隔为3.75KHz,所述OFDM符号对应4个连续的OFDM符号。
- 根据权利要求1所述的方法,其中,还包括,对于独立运营standalone场景,在所述同步信号所在的所述一个或者多个子帧上,所述同步信号对应的所述OFDM符号上,不发送参考信号,或者,对于standalone场景,在所述同步信号所在的所述一个或者多个子帧上,参考信号仅在前q个所述OFDM符号上发送,q为正整数。
- 根据权利要求1所述的方法,其中,还包括,在一个重复周期内,所述同步信号包含多个序列,所述多个序列根据小区标识和/或定时信息生成。
- 根据权利要求7所述的方法,其中,在一个重复周期内,所述同步信号包含多个序列包括,在一个重复周期内,所述同步信号包含的每个OFDM符号对应一个序列;或者,在一个重复周期内,所述同步信号包含的多个OFDM符号对应一个序列,其中所述每个OFDM符号对应所述序列的子序列;或者,在一个重复周期内的多个子帧上,所述多个子帧中的每个子帧对应一个序列。
- 根据权利要求1所述的方法,其中,在一个重复周期内,所述同步信号包含的每个OFDM符号对应一个序列。
- 根据权利要求9所述的方法,其特征在于,所述同步信号包含的每个OFDM符号对应一个长度为11的ZC序列;其中,所述同步信号对应的载波包含12个子载波。
- 根据权利要求9所述的方法,其中,包括:在所述同步信号包含的所述每个OFDM符号或者所述多个OFDM符号对应一个序列的情况下,所述序列由所述序列对应的OFDM符号确定。
- 根据权利要求1或权利要求2所述的方法,其中,所述同步信号在一个或者多个子帧上的多个OFDM符号对应的时间上发送包括:所述同步信号在m个所述OFDM符号对应的时间上发送,其中m∈{5,6,7,8,10,12}。
- 根据权利要求1所述的方法,其中,包括:所述多个OFDM符号对应的时间包含两部分,所述两部分的每一部分对应一个序列,所述两部分包括:所述两部分是按照时间顺序划分为两部分的,或者,所述两部分分别为奇数索引的OFDM符号对应的时间和偶数索引的OFDM符号对应的时间;其中,所述索引是将所述同步信号对应的OFDM符号按照时间顺序重新从0开始编号后的索引。
- 根据权利要求1所述的方法,其中,包括:在所述同步信号对应的所述OFDM符号上,对于不发送小区专用参考信号CRS的子载波,所述同步信号为:y(k)=x(k)·c,其中c=s(k0)/x(k0),其中,k0为所述符号上的预设资源块RE上的CRS的子载波索引,x(k0)为子载波#k0对应的PSS或者SSS序列的值,s(k0)为子载波#k0对应的CRS符号值。
- 一种同步信号的传输方法,包括:终端周期重复接收基站发送的同步信号;在一个重复周期内,所述同步信号在一个或者多个子帧上的多个正交频分复用技术OFDM符号对应的时间上接收,所述同步信号是主同步信号PSS或者辅同步信号SSS。
- 根据权利要求15所述的方法,其中,包括:对于所述一个或者多个子帧中的一个子帧,所述多个OFDM符号包括所述一个子帧中的连续多个OFDM符号,或者,所述同步信号在所述一个或者多个子帧上接收时,所述多个OFDM符号为预设集合中的符号,所述集合包括每个时隙的第三个OFDM符号、第四个OFDM符号和最后两个OFDM符号。
- 根据权利要求15或权利要求16所述的方法,其中,还包括,所述PSS位于连续的k1个无线帧,以T1个无线帧为周期接收,T1≥k1,所述SSS以T2个无线帧为周期接收,或者,所述PSS以T3个无线帧为周期接收,所述SSS位于连续的k2个无线帧,以T4个无线帧为周期接收,T4≥k2,或者,所述PSS和所述SSS位于连续的k3个无线帧上,以T5个无线帧为周期接收,T5≥k3;其中,k1、k2、k3、T1、T2、T3、T4、T5均为正整数。
- 根据权利要求15所述的方法,其中,还包括,在一个重复周期内,所述同步信号包含M个OFDM符号,第m个OFDM符号的子载波间隔为15/AmKHz,其中1≤m≤M,m,M和Am均为正整数。
- 根据权利要求18所述的方法,其中,还包括,当Am=2时,子载波间隔为7.5KHz,所述OFDM符号对应2个连续的OFDM符号,所述2个连续的OFDM符号包括以下之一:一个时隙的第三个OFDM符号和第四个OFDM符号,或者一个时隙的最后两个OFDM符号;当Am=4时,子载波间隔为3.75KHz,所述OFDM符号对应4个连续的OFDM符号。
- 根据权利要求15所述的方法,其中,还包括,对于独立运营standalone场景,在所述同步信号所在的所述一个或者多个子帧上,所述同步信号对应的所述OFDM符号上,不接收参考信号,或者,对于standalone场景,在所述同步信号所在的所述一个或者多个子帧上,参考信号仅在前q个所述OFDM符号上接收,q为正整数。
- 根据权利要求15所述的方法,其中,还包括,在一个重复周期内,所述同步信号包含多个序列,所述多个序列根据小区标识和/或定时信息生成。
- 根据权利要求21所述的方法,其中,在一个重复周期内,所述同步信号包含多个序列包括,在一个重复周期内,所述同步信号包含的每个OFDM符号对应一个序列;或者,在一个重复周期内,所述同步信号包含的多个OFDM符号对应一个序列,其中所述每个OFDM符号对应所述序列的子序列;或者,在一个重复周期内的多个子帧上,所述多个子帧中的每个子帧对应一个序列。
- 根据权利要求22所述的方法,其中,包括:在所述同步信号包含的所述每个OFDM符号或者所述多个OFDM符号对应一个序列的情况下,所述序列由所述序列对应的OFDM符号确定。
- 根据权利要求15或权利要求16所述的方法,其中,所述同步信号在一个或者多个子帧上的多个正交频分复用技术OFDM符号对应的时间上接收包括:所述同步信号在m个所述OFDM符号对应的时间上接收,其中m∈{5,6,7,8,10,12}。
- 根据权利要求15所述的方法,其中,包括:所述多个OFDM符号对应的时间包含两部分,所述两部分的每一部分对应一个序列,所述两部分包括:所述两部分是按照时间顺序划分为两部分的,或者,所述两部分分别为奇数索引的OFDM符号对应的时间和偶数索引的OFDM符号对应的时间;其中,所述索引是将所述同步信号对应的OFDM符号按照时间顺序重新从0开始编号后的索引。
- 根据权利要求15所述的方法,其中,包括:在所述同步信号对应的所述OFDM符号上,对于不接收小区专用参考信号CRS的子载波,所述同步信号为:y(k)=x(k)·c,其中c=s(k0)/x(k0),其中,k0为所述符号上的预设资源块RE上的小区专用参考信号CRS的子载波索引,x(k0)为子载波#k0对应的PSS或者SSS序列的值,s(k0)为子载波#k0对应的CRS符号值。
- 根据权利要求15所述的方法,其中,包括所述同步信号的位置由以下至少之一确定:小区标识;所述同步信号对应的频域位置或者是PRB索引或者是频偏。
- 根据权利要求27所述的方法,其中,包括:当所述小区标识为X的时候,所述同步信号位于所述同步信号所在的物理资源块的后N个子载波上,当所述小区标识为Y的时候,所述同步信号位于所述同步信号所在的物理资源块的前N个子载波上,其中,N为正整数。
- 根据权利要求28所述的方法,其中,包括:所述小区标识X满足mod(X,3)等于0,所述小区标识Y满足mod(Y,3)不等于0;或者,所述小区标识Y满足mod(Y,3)等于2,所述小区标识X满足mod(X,3)不等于2;所述小区标识X满足mod(X,6)等于0,所述小区标识Y满足mod(Y,6)不等于0;或者,所述小区标识Y满足mod(Y,6)等于5,所述小区标识X满足mod(X,6)不等于5。
- 根据权利要求30所述的方法,其中,包括:对所述ZC序列的根索引进行分组,所述分组的方式包括以下至少之一:方式1:第一组包括u={5,6,4,7,3,8}的ZC序列,第二组包括u={2,9}的ZC序列,第三组包括u={1,10}的ZC序列;方式2:第一组包括u={1,10,2,9,3,8}的ZC序列,第二组包括u={4,7}的ZC序列,第三组包括u={5,6}的ZC序列;其中,所述第二组和所述第三组的序列可以互换。
- 根据权利要求31所述的方法,其中,包括:所述第一组ZC序列映射到第一OFDM符号上,所述第二组ZC序列映射到第二OFDM符号上,所述第三组ZC序列映射到第三OFDM符号上,其中,所述第一OFDM符号包括子帧中编号为{5,6,9,10,12,13}的符号,所述第二OFDM符号包括子帧中编号为{3,4},所述第三OFDM符号包括子帧中编号为{7,8}的符号,其中,所述子帧中符号编号从0开始。
- 根据权利要求30所述的方法,其中,包括:所述同步信号在子帧中倒数第三个OFDM符号上使用的ZC序列与子帧中最后一个OFDM符号上使用的ZC序列相同;或者,与第二个时隙第一个OFDM符号使用的ZC序列相同;或者,与第一个时隙最后一个OFDM符号使用的ZC序列相同;或者,与所述同步信号在子帧中的第一个OFDM符号使用的ZC序列相同。
- 根据权利要求29所述的方法,其中,包括:当循环前缀为常规循环前缀时,所述同步信号包含的OFDM符号按照时间顺序对应的序列的根索引依次为以下之一:{1,2,3,4,5,6,7,8,9,10,1};{1,2,3,4,5,1,6,7,8,9,10};{1,10,2,9,3,5,8,4,7,5,6};{1,10,2,9,3,8,4,7,6,5,6};{2,9,5,6,1,10,4,7,3,8,3};{2,9,3,8,1,10,4,7,5,6,5}。
- 根据权利要求30所述的方法,其中,包括:当循环前缀为扩展循环前缀时,所述同步信号包含的OFDM符号按照时间顺序对应的序列的根索引依次为以下之一:{1,2,3,4,5,6,7,8,9};{1,2,3,4,5,7,8,9,10};{1,10,2,9,3,4,7,5,6};{1,10,2,9,3,8,4,7,6};{1,5,6,2,9,3,8,4,7};{1,4,7,2,9,3,8,5,6}。
- 一种同步信号的传输装置,位于基站侧,包括:发送模块,设置为向终端周期重复发送同步信号;在一个重复周期内,所述同步信号在一个或者多个子帧上的多个正交频分复用技术OFDM符号对应的时间上发送,所述同步信号是主同步信号PSS或者辅同步信号SSS。
- 一种同步信号的传输装置,位于终端侧,包括:接收模块,设置为周期重复接收基站发送的同步信号;在一个重复周期内,所述同步信号在一个或者多个子帧上的多个正交频分复用技术OFDM符号对应的时间上接收,所述同步信号是主同步信号PSS或者辅同步信号SSS。
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EP3358774A1 (en) | 2018-08-08 |
US20180248735A1 (en) | 2018-08-30 |
US10666484B2 (en) | 2020-05-26 |
CN106559206B (zh) | 2019-04-23 |
CN106559206A (zh) | 2017-04-05 |
JP2018536323A (ja) | 2018-12-06 |
JP6586520B2 (ja) | 2019-10-02 |
EP3358774B1 (en) | 2022-01-12 |
KR20180063115A (ko) | 2018-06-11 |
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