CN108141427A - A kind of reference signal production method and device - Google Patents
A kind of reference signal production method and device Download PDFInfo
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- CN108141427A CN108141427A CN201680056622.3A CN201680056622A CN108141427A CN 108141427 A CN108141427 A CN 108141427A CN 201680056622 A CN201680056622 A CN 201680056622A CN 108141427 A CN108141427 A CN 108141427A
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Abstract
A kind of reference signal production method and device, second sequence is determined according to the generator polynomial of the initial value of the second sequence and the second sequence, second sequence is mapped as to the reference signal sequence of complex modulation symbols, or First ray is determined according to the initial value of First ray and the generator polynomial of First ray, Gold sequence is determined according to the Modulo-two operation result of the First ray and second sequence, the Gold sequence is mapped as to the reference signal sequence of complex modulation symbols, using multiple reference marks in a time slot identical initial value is used using multiple reference marks in identical initial value or multiple time slots, simplify terminal in the complexity being demodulated using reference signal, increase the randomization characteristic of reference signal.
Description
The present invention relates to the field of communications, and in particular, to a method and an apparatus for generating a reference signal.
In the evolution process from the 2G network to the 4G network, in order to satisfy the increasing wireless mobile broadband internet access service and voice service of people, the cellular communication technology needs an increasingly large system bandwidth, and when the transmission power of a base station is fixed, the transmission power per unit bandwidth is reduced, so that the signal coverage area of the base station is smaller and smaller. In the process of the evolution of mobile communication to the 5G technology, the internet of things service is gradually becoming an important service of wireless communication.
Currently, an Internet of things scheme NB-IoT (chinese: narrowband Internet of things) is discussed in 3GPP RAN (Radio Access Network) to define a downlink bandwidth as only 600 KHz. As the system bandwidth is reduced, the transmitting power on the unit bandwidth is improved, and the application requirement of large coverage of the Internet of things is met. Meanwhile, in order to consider both the spectrum efficiency and the industrial compatibility, most of the designs in the multiplexing LTE (Long term evolution) in the downlink transmission also adopt the OFDM (orthogonal Frequency Division multiplexing) transmission mode, but the design of the downlink reference signal is not determined.
One possible approach is that the downlink Reference signal NB-RS (Chinese: narrowband Reference signal) of NB-IoT also follows the design of CRS (Chinese: Cell specific Reference signal) in LTE (Chinese: Long Term Evolution). CRS signal generation, comprising two steps:
step 1: reference signal sequence generation
The reference signal sequence is generated by Gold sequence and mapped to QPSK signal, where the initial value of the second sequence is identified by physical layer cell to the number n of time slots in one framesAnd the number of OFDM symbols in one slot, l, and Ncp type.
Wherein n issIs the time slot number in a frame, takes an integer with the value range of (0,1, … 19), l represents the symbol number in a time slot, takes a value range of NCPAnd 0 and 1 respectively indicate two cyclic prefix types of the OFDM symbol, and represent physical layer cell identification.
Step 2: sequence mapping on time frequency resource, corresponding to nsResource Element (RE) in the first OFDM in the time slot.
The unit of time-frequency resources in NB-IoT, which also multiplexes time-frequency resources in LTE, is Resource Block division, i.e. each RB (chinese: Resource Block, english: Resource Block) is divided into 12 subcarriers in frequency, each subcarrier is 15KHz, and each grid of time domain 6 or 7 OFDM symbols is called a Resource unit, and each RE can be used to transmit a reference signal. Each RE position may be determined by a subcarrier number k and a symbol number l within one slot, as shown in fig. 1.
Through the above description, we find that NB-RS multiplexing CRS signals in the existing LTE has at least the following disadvantages:
1. within the system bandwidth of 200KHz, there are only 12 sub-carriers (15KHz 12 ═ 180KHz, and 20KHz left as guard band). Due to the resource interval of two adjacent reference signals of the CRS being 5 subcarriers, only 2 REs can be used for placing reference sequences in the system bandwidth in one OFDM, and the sequence length is too short to achieve the effect of randomizing the reference signals between different cells.
2. The terminal needs to regenerate NB-RS at the receiving end to perform downlink channel measurement, channel estimation and data demodulation. The initial value of the reference sequence is directly related to the symbol sequence number l in a time slot, that is, the reference sequence on each OFDM symbol is different, thereby increasing the complexity of the terminal in processing NB-RS.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for generating a reference signal, so as to simplify the complexity of the terminal in demodulating with the reference signal.
In a first aspect, an embodiment of the present invention provides a method for generating a reference signal, where the method includes:
when only the second sequence is mapped as the reference signal sequence, the following steps may be specifically performed:
determining a second sequence according to an initial value of the second sequence and a generator polynomial of the second sequence, wherein the initial value of the second sequence is determined by a physical layer cell identifier, a time slot number and a grouping parameter, wherein the grouping parameter is a constant and represents grouping a plurality of time slots in a value range of the time slot number or grouping a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time slot corresponding to the time slot number;
the second sequence may be mapped to a reference signal sequence of complex modulation symbols.
Determining a Gold sequence by using the first sequence and the second sequence, and when mapping the Gold sequence to a reference signal sequence, specifically:
determining a second sequence according to an initial value of the second sequence and a generator polynomial of the second sequence, wherein the initial value of the second sequence is determined by a physical layer cell identifier, a time slot number and a grouping parameter, wherein the grouping parameter is a constant and represents grouping a plurality of time slots in a value range of the time slot number or grouping a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time slot corresponding to the time slot number;
determining a first sequence according to an initial value of the first sequence and a generator polynomial of the first sequence, determining a Gold sequence according to a modulo-2 operation result of the first sequence and the second sequence, and mapping the Gold sequence to a reference signal sequence of complex modulation symbols.
There are two implementation ways to transmit the obtained reference signal sequence, which may be mapping the reference signal sequence to the resource unit where the reference signal is located in the multiple time slot groups, and transmitting through an antenna port. The reference signal sequence may also be mapped to a resource unit in which the reference signal in a plurality of OFDM symbol packets is located in a time slot corresponding to the time slot number, and transmitted through an antenna port.
The determining of the Gold sequence from the initial values of the second and first sequences may specifically comprise determining the Gold sequence from the first sequenceDetermining the Gold sequence by the initial values of the two sequences and the first sequence and discarding the Gold sequence initially yields Nc-NBA value of Nc-NB，0≤Nc-NB< 1024, initially generating a Gold sequence N in determining the Gold sequencec-NBThe values are discarded.
In one possible design, the length of the reference signal sequence or the reference signal sequence is greater than or equal to the number of resource units in which reference signals on a plurality of OFDM symbols in a plurality of OFDM symbol groups in a time slot corresponding to the time slot number are located in a plurality of time slot groups in a value range of the time slot number.
The resource unit comprises all OFDM symbols occupying one time slot in time, two subcarriers occupied in frequency and 5 subcarriers spaced by the two subcarriers.
The value range of the slot number is the slot number in one or more frames, wherein, a frame may be an M subframe, and the value range of the slot number may be the slot number in one M subframe, the slot number in one M frame, or the slot number in one frame.
In one possible design, the mapping the reference signal sequence to the resource unit where the reference signal in the multiple time slot groups is located, and transmitting through an antenna port or mapping the reference signal sequence to the resource unit where the reference signal in the multiple OFDM symbol groups is located in the time slot corresponding to the time slot number, and transmitting through the antenna port includes:
and mapping the reference signal sequence to resource units on which reference signals on a plurality of time slot groups in the value range of the time slot number or a plurality of OFDM symbols in a plurality of orthogonal frequency division multiplexing symbol groups in the time slot corresponding to the time slot number are positioned by adopting priority time-based sequential mapping or priority frequency-based sequential mapping.
In a second aspect, an embodiment of the present invention provides a reference signal generating apparatus, where the reference signal generating apparatus has a function of implementing the reference signal generating behavior in the first aspect. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.
In one possible design, the reference signal generating apparatus includes a processor and a memory, the memory is used for storing a program for supporting the reference signal generating apparatus to execute the method, and the processor is configured to execute the program stored in the memory. The reference signal generating apparatus may further comprise a communication interface for the data processing device to communicate with other devices or a communication network.
In a third aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for the data processing apparatus, which includes a program designed for executing the reference signal generating device according to the above aspect.
The method and the device for generating the reference signal determine a second sequence according to an initial value of the second sequence and a generating polynomial of the second sequence, map the second sequence into a reference signal sequence of complex modulation symbols, or determine a first sequence according to the initial value of the first sequence and the generating polynomial of the first sequence, determine a Gold sequence according to a modulo-2 operation result of the first sequence and the second sequence, map the Gold sequence into a reference signal sequence of the complex modulation symbols, utilize a plurality of reference symbols in a time slot to adopt the same initial value or a plurality of reference symbols in a plurality of time slots to adopt the same initial value, simplify the complexity of a terminal in demodulating by utilizing the reference signal, and increase the randomization property of the reference signal.
These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.
Fig. 1 is a diagram of reference symbol patterns of LTE in the prior art, where the vertical axis is frequency and the horizontal axis is time;
FIG. 2 is a flow chart of one embodiment of a method for reference signal generation according to one embodiment of the present invention;
FIG. 3 is a flow chart of another embodiment of a reference signal generation method in an embodiment of the present invention;
fig. 4 is a block diagram of an embodiment of a reference signal generating apparatus according to an embodiment of the present invention.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method in LTE (English: Long term evolution) of NB-IoT (Chinese: narrowband Internet of things, English: Narrow band Internet of things) time-frequency resource division multiplexing. The unit of time-frequency resources in NB-IoT, also the unit of time-frequency resources in LTE, is Resource Block division, that is, each RB (chinese: Resource Block) is divided into 12 subcarriers in frequency, and a grid of 6 or 7 OFDM symbols in time domain, each grid is called a Resource unit (RE for short), each RE can be used to transmit reference signals or data or blank, when blank is not used for any transmission, a new frame structure is defined in NB-IoT, every 6 subframes of LTE form an M subframe, and every 10M subframes form an M frame.
Because the initial value of the reference sequence is related to the number l of OFDM symbols in a slot, a reference sequence is generated on each OFDM symbol, so that the complexity of generating the reference signal by the terminal is high, and in addition, the reference sequence can be used only after the initial 1600 values are generated, which also causes the complexity of generating the reference signal sequence by the terminal to be too high. The design requirements of low-cost NB-IoT cannot be met.
In order to overcome the above-mentioned drawbacks, an embodiment of a method for generating a reference signal according to an embodiment of the present invention is shown in fig. 2, and the method includes:
s201, determining a second sequence according to an initial value of the second sequence and a generator polynomial of the second sequence, wherein the initial value of the second sequence is determined by a physical layer cell identifier, a time slot number and a grouping parameter, wherein the grouping parameter is a constant and represents grouping a plurality of time slots in a value range of the time slot number or grouping a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time slot corresponding to the time slot number.
For the method that the initial value of the second sequence is determined by the physical layer cell identifier, the time slot number and the grouping parameter, the embodiment of the invention provides two modes:
the first implementation mode comprises the following steps: using multiple time slot groups within a range of time slot number values
When grouping parameter NgslotThe method of the initial value of the second sequence when grouping a plurality of time slots within the range of values of the time slot number may be expressed as
One of the concrete manifestations may be,
wherein u1 represents the corresponding digit of the initial value in the second sequence, and is determined by the value range, i.e. the time slot number in one M subframe, the time slot number in one M frame or the time slot number in one frame. According to NB-IoT definitions, one M frame includes 10M subframes, and each subframe in 6 LTE forms one M subframe, and the corresponding value range may have different definitions, where the number of elements in the corresponding value range is. The number of the time slots in one M subframe is (0,1, …,6 x 2-1), and the total number of the time slots is 12, namely 12 time slots are grouped; or a total of 120 slots, i.e. 120 slots grouped, by slot number (0,1, …, 20 x 6-1) within one M frame, or a total of 20 slots, i.e. 20 slots grouped, by slot number (0,1,2, …,19) within one frame.
The value range can be changed by different grouping parameters, and the value range can also be changed by different grouping parameters to express the rounding-down operation, namely, the serial number aN is takengslotTo (a +1) NgslotAt time-1, the values obtained are all the same as a, where a is the integer 0,1, …. So as to pass c of the calculationinitThe same, will take a number of time slots in the range, every NgslotThe time slots are divided into groups, each group using the same initial value. It is understood that by grouping a plurality of time slots within a range of values, each group comprising NgslotAnd a time slot. Simple method NgslotTaking the number of slots in the value range as an integer, e.g. N may be taken when the number of slots in an M subframe or in an M framegslot1,2,3, 6. When the time slot number is (0,1,2, …,19) in a frame, N can be takengslot＝1,2,4,8,10。
It is worth to say that when N isgslotWhen 1, all OFDM symbols in one slot in the slot number range are in one group, i.e. 6 or 7 OFDM symbols in time domain. The operation is equivalent to the embodiment that the grouping parameter is not shown.
The second implementation mode comprises the following steps: grouping using multiple Orthogonal Frequency Division Multiplexing (OFDM) symbols within a slot number
The method of determining the initial value of the second sequence when the grouping parameter is a grouping of a plurality of orthogonal frequency division multiplexing, OFDM, symbols within a slot number is denoted as
One of the concrete ones is as
Wherein N isgsymFor grouping parameters, by operation, N in a time slotgsymOne OFDM symbol is taken as a group. When l isNBIs taken as the value of bNgsymTo (b +1) NgsymAt time-1, the values are all b. N is a radical ofgsymThe number of symbols included in one slot may be represented by 1,2, etc., and the OFDM symbols are divided into a plurality of groups by the operation.
Wherein u2 is such that c is satisfiedinit≤230U3 is determined according to the value range, i.e. the time slot number in an M subframe, the time slot number in an M frame or the time slot number in a frame.
It should be noted that, with the above two implementations, the reference signal sequence on the OFDM symbols in each group has only one initial value of the second sequence.
Determining a second sequence according to the generating polynomial of the second sequence and the initial value of the second sequence;
x2(n+31)＝(x2(n+3)+x2(n))mod2
or
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
In order to multiplex the LTE modules as much as possible, the generator polynomial of the second sequence may multiplex two m-sequence generator polynomials defined in LTE, and for the polynomial form of the two sequences, it should be understood by those skilled in the art that the details are not described herein.
S202, mapping the second sequence to a reference signal sequence of complex-valued modulation symbols (complex-valued modulation symbols).
When the reference signal sequence is obtained by mapping only the second sequence, determining the second sequence according to the generator polynomial of the second sequence and the initial value of the second sequence, and mapping the second sequence to obtain the reference signal sequence, where BPSK, pi/2-BPSK, QPSK, and the like are commonly mapped, and this is not particularly limited.
Determining second sequence determining first sequence when BPSK (Chinese: Binary Phase Shift Keying) mapping is used, i.e., mapping the value of 0 or 1 generated by the random sequence to the complex modulation symbol sum
When pi/2-BPSK (Chinese: Binary Phase Shift Keying) mapping is adopted, the value of 0 or 1 generated by a random sequence is mapped into a modulation symbol based on continuous Phase complex numbers;
when QPSK (Quadrature Phase Shift Keying) mapping is used, i.e. the value of 0 or 1 generated for each two random sequences is mapped to the real or imaginary part of the complex modulation symbol, respectively:
wherein the most possible positions within a symbol of a set of reference signals,
there are one reference signal position, i.e. one resource unit, in the 12 subcarriers of one slot, in combination with the possible position or of the reference signal in each group
When the grouping parameter groups reference signals in one or more slots, when the grouping parameter groups reference signals in a plurality of OFDM symbols in one slot, NgrsIndicating the number of sets, e.g., 1,2, of reference signals in a slot.
The reference signal generation method provided by the invention has the advantages that the same initial value is adopted by a plurality of reference symbols in one time slot or the same initial value is adopted by a plurality of reference symbols in a plurality of time slots, the complexity of the terminal in demodulating by using the reference signal is simplified, and the randomization property of the reference signal is increased.
Referring to fig. 3, in view of a process of determining a Gold sequence by using a first sequence and a second sequence, and mapping the Gold sequence to a reference signal sequence of complex modulation symbols, an embodiment of the present invention further provides a reference signal generating method, where the method includes:
s301, determining a second sequence according to an initial value of the second sequence and a generator polynomial of the second sequence, wherein the initial value of the second sequence is determined by a physical layer cell identifier, a time slot number and a grouping parameter, and the grouping parameter is a constant and represents that a plurality of time slot groups or a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbol groups in one time slot number are grouped in a time slot number value range.
S302, determining the first sequence according to the initial value of the first sequence and the generator polynomial of the first sequence.
The generator polynomial of the first sequence is x1(n+31)＝(x1(n+3)+x1(n)) mod2, the initial value x of the first sequence1(0)＝1,x1(n)＝0,n＝1,2,...,30。
It should be noted that the order of step S301 and step S302 may be reversed, that is, the first sequence may be determined first, and then the second sequence may be determined, which is not limited herein.
S303, determining a Gold sequence according to the modulo-2 operation result of the first sequence and the second sequence.
Determining the Gold sequence according to the modulo-2 operation result of the first sequence and the second sequence, and discarding the first sequence and the second sequence to initially generate Nc-NBA value of Nc-NB，0≤Nc-NB＜1024。
In particular, the Gold sequence consists of two m-sequences, a first sequence x1(n), the second sequence x2(n) modulo 2 plus:
c(n)＝(x1(n+NC-NB)+x2(n+NC-NB))mod2
wherein N isC-NBDenotes the length of the initially discarded sequence, 0 ≦ NC-NBLess than or equal to 1024, wherein NC-NBCan be a fixed value of (0, 32, 64, 128, 256, 512, 1024), with a preferred value of NC-NBWhen the length of the sequence to be discarded initially is 0, that is, the method of discarding the initial 1600 values of the Gold sequence in LTE is no longer used, which can further reduce the complexity of generating the reference signal.
For the first sequence with a fixed initial value, x is used1(0)＝1,x1(n) 0, n 1, 2.., 30. the initial value of the second sequence is determined, i.e., c isinitValue import of corresponding bit of (1)Into a shift register.
S304, mapping the Gold sequence into a reference signal sequence of complex modulation symbols.
Common mappings are BPSK, pi/2-BPSK, QPSK, etc., and are not particularly limited herein.
When BPSK (Binary Phase Shift Keying) mapping is used, the value of 0 or 1 generated by the random sequence is mapped to the sum of complex modulation symbols
When pi/2-BPSK (Chinese: Binary Phase Shift Keying) mapping is adopted, the value of 0 or 1 generated by a random sequence is mapped into a modulation symbol based on continuous Phase complex numbers;
when QPSK (Quadrature Phase Shift Keying) mapping is used, i.e. the value of 0 or 1 generated for each two random sequences is mapped to the real or imaginary part of the complex modulation symbol, respectively:
wherein the most possible positions within a symbol of a set of reference signals,
there is one reference signal position, i.e. one resource unit, in the sub-carrier of the maximum downlink bandwidth of a time slot, in combination with the possible position or of the reference signal in each group
There are one reference signal position, i.e. one resource unit, in the 12 subcarriers of one slot, in combination with the possible position or of the reference signal in each group
When the grouping parameter groups reference signals in one or more slots, when the grouping parameter groups reference signals in a plurality of OFDM symbols in one slot, NgrsIndicating the number of sets, e.g., 1,2, of reference signals in a slot.
S305, mapping the reference signal sequence to a resource unit where the reference signal is located in the multiple time slot groups, and transmitting through an antenna port; or mapping the reference signal sequence to the resource unit where the reference signal in a plurality of OFDM symbol groups is located in the time slot corresponding to the time slot number, and transmitting through an antenna port.
Mapping reference signal sequence to the I-th OFDM symbol in corresponding time slot numberOn the kth resource unit. Since multiple OFDM share the initial value of the reference signal sequence, then r1(m) the resource elements on which reference signals on multiple OFDM symbols within a packet need to be mapped.
The resource units where the reference signal sequences need to be mapped to the reference signals on a plurality of OFDM symbols in the packet may be sequentially filled in priority time, that is, the number of reference signals on each OFDM symbol is modulo when the parameter between the subcarrier position and the sequence m is determined. When the number of reference signals per OFDM is 2 and the two reference signals are separated in frequency by 5 resource elements, it can be determined by determining k 6 · (m) mod2+ (v + v)shift)mod6，v+vshiftIndicating the offset caused by the antenna port p and the physical layer cell identity.
The resource units where the reference signals of a plurality of OFDM symbols in a packet are mapped to the reference signal sequence may also be sequentially filled in a priority frequency, that is, the number of reference signals on the same subcarrier in each packet is modulo when determining the position of subcarrier position k and the parameter between m. When the number of reference signals on the same subcarrier in each packet is 4, k is 6 · (m) mod4+ (v + v)shift)mod6，v+vshiftIndicating the offset caused by antenna port p and physical layer cell id, and the position l of the reference signal on the time symbol can follow the density of CRS in LTE, and the reference signals for antenna ports 0,1 occupy 0 in time, or adopt more positions l, and a preferred mode adopts all the symbols in the list, i.e. occupy
To reduce interference in-band deployment, v or vshiftWith offsets different from LTE, a simple approach is that v is offset by antenna port p and LTE uses orthogonal resources.
For a reference signal, the length of the reference signal sequence or the reference signal sequence is greater than or equal to the number of resource elements on a plurality of OFDM symbols of an antenna port in one or more slots in the packet.
For a resource unit, the resource unit includes:
all OFDM symbols in a slot are occupied in time, two subcarriers are occupied in frequency, and the two subcarriers are separated by 5 subcarriers.
With reference to fig. 4, the reference signal generating method in the embodiment of the present invention is described above, and correspondingly, an embodiment of the present invention further provides a reference signal generating apparatus, configured to execute the method shown in fig. 3, where the apparatus includes:
a processing module 401, configured to determine a second sequence according to an initial value of the second sequence and a generator polynomial of the second sequence, where the initial value of the second sequence is determined by a physical layer cell identifier, a timeslot number, and a grouping parameter, where the grouping parameter is a constant and indicates grouping a plurality of timeslots within a value range of the timeslot number or indicating grouping a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols within a timeslot corresponding to the timeslot number;
the processing module 401 is configured to map the determined second sequence to a reference signal sequence of complex modulation symbols or determine a first sequence according to an initial value of the first sequence and a generator polynomial of the first sequence, determine a Gold sequence according to a modulo-2 operation result of the first sequence and the second sequence, and map the Gold sequence to the reference signal sequence of complex modulation symbols.
Optionally, the apparatus is a base station or a terminal device.
A base station side:
the base station sending the downlink reference signal comprises generating a random sequence, mapping the random sequence into a reference signal sequence of a plurality of modulation symbols, mapping the reference signal sequence to an antenna, and sending the reference signal to a time-frequency resource in a subframe number time slot.
A terminal device side:
the terminal receives the synchronous CHannel to obtain the Physical layer cell mark, and obtains the frame number by receiving the synchronous CHannel and the PBCH (Chinese: Physical Broadcast CHannel, English: Physical Broadcast CHannel) CHannel, and determines the corresponding sub-frame number. And the terminal generates a random sequence according to the physical layer cell identification and the subframe number, and maps the random sequence into a reference signal sequence of the complex modulation symbols.
And the terminal receives the OFDM symbols in the corresponding subframe number and obtains the received reference signal sequence on a plurality of OFDM symbols in the subframe through inverse mapping. And performing special operations through the generated reference signal sequence and the received reference signal sequence to obtain channel measurement, channel estimation and data demodulation.
Optionally, when the apparatus is a base station, the processing module is further configured to map the obtained reference signal sequence to a resource unit where a reference signal in the multiple time slot groups is located, and transmit the reference signal through an antenna port; or mapping the obtained reference signal sequence to resource units where reference signals in a plurality of OFDM symbol groups are located in a time slot corresponding to the time slot number, and transmitting through an antenna port.
The device further comprises: a sending module 402, configured to send the reference signal processed by the processing module through the antenna port.
Optionally, the processing module 401 is further configured to:
determining the Gold sequence according to the initial value of the second sequence and the initial value of the first sequence and discarding the Gold sequence to generate Nc-NBA value of Nc-NB，0≤Nc-NB＜1024。
Optionally, the length of the reference signal sequence or the reference signal sequence is greater than or equal to the number of resource units in which the reference signal is located on a plurality of time slot groups within a value range of the time slot number, or on a plurality of OFDM symbols within a plurality of OFDM symbol groups within a time slot corresponding to the time slot number.
Optionally, the resource unit includes:
all OFDM symbols in a slot are occupied in time, two subcarriers are occupied in frequency, and the two subcarriers are separated by 5 subcarriers.
Optionally, the value range of the slot number is the slot number in one or more frames, the frame may be an M subframe, each 6 LTE subframes constitutes an M subframe, and each 10M subframes constitutes an M frame.
Optionally, the processing module 401 is further configured to:
and mapping the reference signal sequence to resource units on which reference signals on a plurality of time slot groups in the value range of the time slot number or a plurality of OFDM symbols in a plurality of orthogonal frequency division multiplexing symbol groups in the time slot corresponding to the time slot number are positioned by adopting priority time-based sequential mapping or priority frequency-based sequential mapping.
Optionally, the grouping parameter is 1, and a plurality of OFDM symbols in one slot in the slot number value range are in one group.
It should be particularly noted that, in this apparatus embodiment, the entity device corresponding to the processing module 401 may be a processor, and the entity device corresponding to the sending module 402 may be a transmitter.
The invention can be widely applied to wireless communication systems, is particularly suitable for Internet of things systems, such as intelligent meter reading, logistics monitoring and the like, simplifies the demodulation complexity of a terminal by using a reference signal, and increases the random characteristic of a sequence.
The reference signal generating device provided by the invention has the advantages that the same initial value is adopted by a plurality of reference symbols in one time slot or the same initial value is adopted by a plurality of reference symbols in a plurality of time slots, the complexity of the terminal in demodulating by using the reference signal is simplified, and the randomization property of the reference signal is increased.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
While the reference signal generating method and apparatus provided by the present invention have been described in detail, those skilled in the art will appreciate that the various embodiments and applications of the invention are possible without departing from the spirit and scope of the invention.
Claims (15)
- A method for generating a reference signal, the method comprising:determining a second sequence according to an initial value of the second sequence and a generator polynomial of the second sequence, wherein the initial value of the second sequence is determined by a physical layer cell identifier, a time slot number and a grouping parameter, wherein the grouping parameter is a constant and represents grouping a plurality of time slots in a value range of the time slot number or grouping a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time slot corresponding to the time slot number;mapping the second sequence to a reference signal sequence of complex modulation symbols, orDetermining a first sequence according to an initial value of the first sequence and a generator polynomial of the first sequence, determining a Gold sequence according to a modulo-2 operation result of the first sequence and the second sequence, and mapping the Gold sequence to a reference signal sequence of complex modulation symbols.
- The method according to claim 1, characterized in that it comprises:mapping the reference signal sequence to a resource unit where the reference signal is located in the multiple time slot groups, and transmitting through an antenna port; orAnd mapping the reference signal sequence to a resource unit where the reference signals in a plurality of OFDM symbol groups are located in a time slot corresponding to the time slot number, and transmitting the reference signals through an antenna port.
- The method of claim 1, wherein determining the Gold sequence based on the initial value of the second sequence and the initial value of the first sequence comprises:determining the Gold sequence according to the initial value of the second sequence and the initial value of the first sequence and discarding the Gold sequence to generate Nc-NBA value of Nc-NB，0≤Nc-NB＜1024。
- The method according to claim 2, wherein the length of the reference signal sequence or the reference signal sequence is greater than or equal to the number of resource units in which reference signals are located on a plurality of time slot groups within a value range of the time slot number or a plurality of OFDM symbols within a plurality of OFDM symbol groups within a time slot corresponding to the time slot number.
- The method of claim 4, wherein the resource unit comprises:all OFDM symbols in a slot are occupied in time, two subcarriers are occupied in frequency, and the two subcarriers are separated by 5 subcarriers.
- The method of claim 1, wherein the slot number is a value in one or more frames.
- The method of claim 2, wherein the mapping the reference signal sequence to the resource units where the reference signals in the multiple time slot groups are located and transmitting through an antenna port or mapping the reference signal sequence to the resource units where the reference signals in the multiple OFDM symbol groups in the time slot corresponding to the time slot number are located and transmitting through an antenna port comprises:and mapping the reference signal sequence to resource units on which reference signals on a plurality of time slot groups in the value range of the time slot number or a plurality of OFDM symbols in a plurality of orthogonal frequency division multiplexing symbol groups in the time slot corresponding to the time slot number are positioned by adopting priority time-based sequential mapping or priority frequency-based sequential mapping.
- An apparatus for generating a reference signal, the apparatus comprising:the processing module is used for determining a second sequence according to an initial value of the second sequence and a generator polynomial of the second sequence, wherein the initial value of the second sequence is determined by a physical layer cell identifier, a time slot number and a grouping parameter, wherein the grouping parameter is a constant and represents grouping a plurality of time slots in a value range of the time slot number or grouping a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time slot corresponding to the time slot number;the processing module is configured to map the determined second sequence to a reference signal sequence of complex modulation symbols or determine a first sequence according to an initial value of the first sequence and a generator polynomial of the first sequence, determine a Gold sequence according to a modulo-2 operation result of the first sequence and the second sequence, and map the Gold sequence to the reference signal sequence of complex modulation symbols.
- The apparatus of claim 8, wherein the reference signal generating apparatus is a base station or a terminal device.
- The apparatus of claim 9, wherein when the reference signal generating apparatus is a base station, the apparatus comprises:the processing module is configured to map the obtained reference signal sequence to resource units where reference signals in the multiple time slot groups are located or map the obtained reference signal sequence to resource units where reference signals in multiple OFDM symbol groups are located in time slots corresponding to the time slot numbers;and the sending module is used for sending the reference signal mapped by the processing module through an antenna port.
- The apparatus of claim 8, wherein the processing module is further configured to:determining the Gold sequence according to the initial value of the second sequence and the initial value of the first sequence and discarding the Gold sequence to generate Nc-NBA value of Nc-NB，0≤Nc-NB＜1024。
- The apparatus of claim 10, wherein the length of the reference signal sequence or the reference signal sequence is greater than or equal to the number of resource units in which reference signals are located on a plurality of slot groups within a value range of the slot number or a plurality of OFDM symbols within a plurality of OFDM symbol groups within a slot corresponding to the slot number.
- The apparatus of claim 12, wherein the resource unit comprises:all OFDM symbols in a slot are occupied in time, two subcarriers are occupied in frequency, and the two subcarriers are separated by 5 subcarriers.
- The apparatus of claim 8, wherein the slot number is a range of slot numbers within one or more frames.
- The apparatus of claim 10, wherein the processing unit is further configured to:and mapping the reference signal sequence to resource units on which reference signals on a plurality of time slot groups in the value range of the time slot number or a plurality of OFDM symbols in a plurality of orthogonal frequency division multiplexing symbol groups in the time slot corresponding to the time slot number are positioned by adopting priority time-based sequential mapping or priority frequency-based sequential mapping.
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| PCT/CN2016/076052 WO2017152407A1 (en) | 2016-03-10 | 2016-03-10 | Method and apparatus for generating reference signal |
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