CN110149713B

CN110149713B - Wireless communication method and wireless communication device

Info

Publication number: CN110149713B
Application number: CN201810151026.4A
Authority: CN
Inventors: 李军; 焦淑蓉; 铁晓磊; 罗之虎
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-02-13
Filing date: 2018-02-13
Publication date: 2021-09-14
Anticipated expiration: 2038-02-13
Also published as: CN110149713A; WO2019157964A1

Abstract

The application discloses a wireless communication method and a wireless communication device, wherein the wireless communication method comprises the following steps: generating a complex-valued symbol sequence, wherein the complex-valued symbol sequence comprises a plurality of complex-valued symbols, and each complex-valued symbol carries an information bit to be transmitted; respectively mapping the complex-valued symbol sequences to resource elements of a plurality of special subframes, wherein each resource element corresponds to a complex-valued symbol; wherein the plurality of special subframes includes a first special subframe and a second special subframe, an order of complex-valued symbols mapped onto resource elements of the first special subframe is different from an order of complex-valued symbols mapped onto resource elements of the second special subframe. Therefore, when the complex-valued symbol sequence is repeatedly sent, the situation that the repetition times of partial complex-valued symbols in the complex-valued symbol sequence are obviously less than those of other complex-valued symbols can be effectively avoided, and the demodulation performance of NB-IoT data transmission is improved.

Description

Wireless communication method and wireless communication device

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a wireless communication method and a wireless communication apparatus.

Background

Two frame structures are supported in a Long Term Evolution (LTE) system: a Frequency Division Duplex (FDD) frame structure and a Time Division Duplex (TDD) frame structure. The TDD frame structure is shown in table 1, where a length of a radio frame is 10ms, which includes 10 subframes, and each subframe is 1 ms. Further, the 10 subframes include a special subframe and a normal subframe, and the special subframe is divided into 3 slots: a downlink pilot slot (DwPTS), a Guard Period (GP), and an uplink pilot slot (UpPTS); the common sub-frame is divided into an uplink sub-frame and a downlink sub-frame, the uplink sub-frame is used for transmitting uplink control signaling, service data and the like, and the downlink sub-frame is used for transmitting downlink control signaling, service data and the like. In table 1, D represents a downlink subframe, U represents an uplink subframe, and S represents a special subframe.

Table 1: uplink and downlink ratio supported by TDD frame structure

Further, the TDD special subframe supports 11 configurations in total, as shown in fig. 1a, the length of DwPTS, GP, UpPTS is different in different configurations, but the total length is not changed, which is 1 ms.

Currently, NB-IoT only supports half duplex (HD-FDD), that is, uplink and downlink frequency band positions are separated, and a terminal device cannot simultaneously transmit and receive signals, that is, the terminal device cannot receive downlink signals while transmitting uplink signals, and cannot transmit uplink signals while receiving downlink signals. There is a need for a TDD NB-IoT system that is introduced, i.e., uplink and downlink transmit or receive signals at different times within the same system bandwidth. In TDD systems, there are special subframes compared to FDD systems, so how to map complex-valued symbols onto special subframes in TDD requires further research.

Disclosure of Invention

The embodiment of the application provides a wireless communication method, which is used for solving the technical problem of poor demodulation performance in the data transmission process.

In a first aspect, an embodiment of the present application provides a wireless communication method, which is performed by a wireless communication apparatus, and includes:

generating a complex-valued symbol sequence comprising a plurality of complex-valued symbols;

mapping the complex-valued symbol sequence to resource elements of a plurality of transmission resource units respectively, wherein each resource element corresponds to one complex-valued symbol;

wherein the plurality of transmission resource units includes a first transmission resource unit and a second transmission resource unit, and an order of complex-valued symbols mapped onto resource elements of the first transmission resource unit is different from an order of complex-valued symbols mapped onto resource elements of the second transmission resource unit.

The transmission resource unit in this embodiment may be a subframe or a slot (slot), and the following description takes the transmission resource unit as a subframe as an example. In the embodiment of the present application, the complex-valued symbols are obtained by performing a series of processing procedures (such as Cyclic Redundancy Check (CRC), Segmentation, coding, modulation, and the like) on the information bits, that is, each complex-valued symbol carries the information bits to be transmitted.

In this way, when the complex-valued symbol sequence is repeatedly transmitted in a plurality of subframes, because the sequence of the complex-valued symbols mapped to the resource elements of the first subframe is different from the sequence of the complex-valued symbols mapped to the resource elements of the second special subframe, the repetition times of part of the complex-valued symbols in the complex-valued symbol sequence can be effectively avoided to be obviously less than that of other complex-valued symbols, and the demodulation performance of data transmission is further improved.

It should be noted that the method in the embodiment of the present application may be applied to various possible scenarios, such as being applied to a TDD NB-IoT data transmission process, which is not limited specifically.

In one possible design, the plurality of subframes includes at least one normal subframe;

the mapping the complex-valued symbol sequences to resource elements of a plurality of subframes respectively comprises:

and mapping each complex value symbol of the complex value symbol sequence to each available resource element of the common subframe in the sequence of increasing the frequency domain first and then increasing the time domain.

In this embodiment, the common subframe may be divided into a downlink subframe and an uplink subframe, all resource elements (or symbols) of the downlink subframe are used for downlink transmission, and all resource elements (or symbols) of the uplink subframe are used for uplink transmission.

In one possible design, the plurality of subframes includes at least one special subframe;

performing sequence transformation on the complex value symbol sequence, wherein the sequence of modulation symbols in the complex value symbol sequence subjected to the sequence transformation is different from the sequence of modulation symbols in the complex value symbol sequence;

and mapping each modulation symbol of the complex value symbol sequence after the sequence transformation to each available resource element of the special subframe in the sequence of increasing the frequency domain first and then increasing the time domain.

Part of the resource elements (or symbols) of the special subframe are used for downlink transmission (DwPTS), part of the resource elements (or symbols) are used for uplink transmission (UpPTS), and part of the resource elements (or symbols) are used for Guard (GP).

Because the resource elements used for uplink transmission and the resource elements used for protection cannot be transmitted in downlink, the sequence of the copied symbol sequence is transformed, and then each modulation symbol of the complex value symbol sequence subjected to the sequence transformation is mapped to each available resource element of the special subframe, so that the repetition frequency of part of complex value symbols in the complex value symbol sequence is effectively prevented from being obviously less than that of other complex value symbols, and the demodulation performance of NB-IoT data transmission is improved.

In one possible design, the mapping the complex-valued symbol sequences onto resource elements of a plurality of special subframes, respectively, includes:

performing sequence transformation on the complex value symbol sequence, wherein the sequence of complex value symbols in the complex value symbol sequence subjected to the sequence transformation is different from the sequence of complex value symbols in the complex value symbol sequence;

and mapping each complex value symbol of the complex value symbol sequence after the sequence transformation to each available resource element of the special subframe in the sequence of increasing the frequency domain first and then increasing the time domain.

In one possible design, the sequence is transformed into a cyclic shift operation whose cyclic shift size is associated with a subframe number of a special subframe to which the complex-valued symbol sequence is mapped and/or a system frame number of a frame in which the special subframe to which the complex-valued symbol sequence is mapped is located.

In one possible design, the formula for the sequence transformation is equivalent to the following formula:

z(i)＝y((i+N_CS)modM),i＝0,1,…,M-1

wherein y (0), …, y (M-1) represents the complex-valued symbol sequence, z (0), …, z (M-1) represents the complex-valued symbol sequence after the sequence transformation, M is the number of complex-valued symbols in the complex-valued symbol sequence, N is the number of complex-valued symbols in the complex-valued symbol sequence, and_CSfor the size of the cyclic shift, N_CSAnd associating the subframe number of the special subframe mapped by the complex value symbol sequence and/or the system frame number of the frame in which the special subframe mapped by the complex value symbol sequence is positioned.

In one possible design, the size N of the cyclic shift_CSThe following formula is satisfied:

wherein P is associated with the number of resource elements for protection and uplink transmission in the special subframe to which the complex-valued symbol sequence is mapped, and in one example, P may be the number of resource elements other than the resource elements occupied by the reference signal in the resource elements for protection and uplink transmission; n is_fAnd the system frame number of the frame where the special subframe mapped by the complex value symbol sequence is located.

wherein, N is the number of resource elements for protection and uplink transmission in the special sub-frame mapped by the complex value symbol sequence, N is_fAnd the system frame number of the frame where the special subframe mapped by the complex value symbol sequence is located.

wherein P is associated with the number of resource elements for protection and uplink transmission in the special subframe to which the complex-valued symbol sequence is mapped, and in one example, P may be the number of resource elements other than the resource elements occupied by the reference signal in the resource elements for protection and uplink transmission; n is_fThe system frame number n of the frame in which the special subframe mapped by the complex value symbol sequence is positioned_sThe time slot number of the special subframe mapped by the complex value symbol sequence.

wherein, N is the number of resource elements for protection and uplink transmission in the special sub-frame mapped by the complex value symbol sequence, N is_fThe system frame number n of the frame in which the special subframe mapped by the complex value symbol sequence is positioned_sThe time slot number of the special subframe mapped by the complex value symbol sequence.

wherein y (0), …, y (M-1) represents the complex-valued symbol sequence, z (0), …, z (M-1) represents the complex-valued symbol sequence after the sequence transformation, M is the number of complex-valued symbols in the complex-valued symbol sequence, X is an integer, and X is greater than or equal to 0 and less than or equal to M, the value of X when the complex-valued symbol sequence mapped to the resource element of the first special subframe is subjected to the sequence transformation is different from the value of X when the complex-valued symbol sequence mapped to the resource element of the second special subframe is subjected to the sequence transformation; p is associated with the number of resource elements for protection and uplink transmission in the special subframe to which the complex-valued symbol sequence is mapped, and in one example, P may be the number of resource elements other than the resource elements occupied by the reference signal in the resource elements for protection and uplink transmission.

In a second aspect, an embodiment of the present application provides a wireless communication method, which is performed by a wireless communication apparatus, and includes:

acquiring a first complex-valued symbol sequence mapped onto resource elements of a special subframe;

performing sequence transformation on the first complex-valued symbol sequence according to the sequence of the complex-valued symbols mapped to the resource elements of the special sub-frames to obtain second complex-valued symbol sequences mapped to the resource elements of the special sub-frames respectively;

wherein the plurality of special subframes includes a first special subframe and a second special subframe, an order of complex-valued symbols mapped onto resource elements of the first special subframe is different from an order of complex-valued symbols mapped onto resource elements of the second special subframe.

It should be noted that the wireless communication method provided by the second aspect is a procedure corresponding to the wireless communication method provided by the first aspect, and if the wireless communication method provided by the first aspect is applied to a procedure of transmitting a signal, the wireless communication method provided by the second aspect may be applied to a corresponding procedure of receiving a signal. Therefore, the description of the second aspect, such as "the first complex-valued symbol sequence mapped onto the resource elements of the special subframe", refers to the mapping actually performed by the communication method provided by the first aspect, and this description is adopted here only for ease of understanding and correspondence. In other possible manners, the communication method provided by the second aspect may also adopt the following descriptions:

acquiring a first complex value symbol sequence loaded on resource elements of a special subframe;

according to a preset rule, performing sequence transformation on the first complex value symbol sequence to obtain second complex value symbol sequences which are respectively mapped to resource elements of a plurality of special subframes;

Here, the preset rule may be an order of the complex-valued symbols mapped to the resource elements of the special subframe, and in a specific implementation, the preset rule may be configured by the sending end device and notified to the receiving end device, or may be specified by a protocol.

z(i)＝y((i+N_CS)modM),i＝0,1,…,M-1

wherein y (0), …, y (M-1) represents the second complex-valued symbol sequence, z (0), …, z (M-1) represents the first complex-valued symbol sequence, M is the number of complex-valued symbols in the complex-valued symbol sequence, N is_CSFor the size of the cyclic shift, N_CSAnd associating the subframe number of the special subframe mapped by the complex value symbol sequence and/or the system frame number of the frame in which the special subframe mapped by the complex value symbol sequence is positioned.

wherein y (0), …, y (M-1) represents the second complex-valued symbol sequence, z (0), …, z (M-1) represents the first complex-valued symbol sequence, M is the number of complex-valued symbols in the complex-valued symbol sequence, X is an integer, and X is greater than or equal to 0 and less than or equal to M, and a value of X when the complex-valued symbol sequence mapped to the resource element of the first special subframe is subjected to sequence transformation is different from a value of X when the complex-valued symbol sequence mapped to the resource element of the second special subframe is subjected to sequence transformation.

In a third aspect, an embodiment of the present application provides a wireless communication apparatus, including:

a processing unit for generating a complex-valued symbol sequence, the complex-valued symbol sequence comprising a plurality of complex-valued symbols;

a mapping unit, configured to map the complex-valued symbol sequence to resource elements of multiple special subframes, where each resource element corresponds to one complex-valued symbol;

In one possible design, the mapping unit is specifically configured to:

z(i)＝y((i+N_CS)modM),i＝0,1,…,M-1

In one possible design, the size N of the cyclic shift_CSSatisfies the following formulaFormula (II):

In a fourth aspect, an embodiment of the present application provides a wireless communication apparatus, including:

a processing unit, configured to obtain a first complex-valued symbol sequence mapped onto resource elements of a special subframe;

a transformation unit, which performs sequence transformation on the first complex-valued symbol sequence according to the sequence of the complex-valued symbols mapped to the resource elements of the special sub-frames to obtain second complex-valued symbol sequences mapped to the resource elements of a plurality of special sub-frames respectively;

z(i)＝y((i+N_CS)modM),i＝0,1,…,M-1

wherein y (0), …, y (M-1) represents the second complex-valued symbol sequence, z (0), …, z (M-1) represents the first complex-valued symbol sequence, M is the number of complex-valued symbols in the second complex-valued symbol sequence, N is_CSFor the size of the cyclic shift, N_CSAnd associating the subframe number of the special subframe mapped by the complex value symbol sequence and/or the system frame number of the frame in which the special subframe mapped by the complex value symbol sequence is positioned.

wherein y (0), …, y (M-1) represents the second complex-valued symbol sequence, z (0), …, z (M-1) represents the first complex-valued symbol sequence, M is the number of complex-valued symbols in the second complex-valued symbol sequence, X is an integer, and X is greater than or equal to 0 and less than or equal to M, and a value of X when the complex-valued symbol sequence mapped to the resource element of the first special subframe is subjected to sequence transformation is different from a value of X when the complex-valued symbol sequence mapped to the resource element of the second special subframe is subjected to sequence transformation.

An embodiment of the present application further provides a wireless communication device, including:

a processing unit and a storage unit;

the storage unit is to store computer instructions that, when executed in the processing unit, cause the wireless communication apparatus to:

mapping the complex-valued symbol sequence to resource elements of a plurality of special subframes respectively, wherein each resource element corresponds to one complex-valued symbol;

a processing unit and a storage unit;

In one possible design, the wireless communication apparatus in the first and third aspects is a semiconductor chip, and the semiconductor chip is disposed within a base station.

In one possible design, the wireless communication apparatus of the first and third aspects is a base station, and further comprises a transmitting unit configured to repeat transmitting the complex-valued symbol sequence in the plurality of subframes, the complex-valued symbol sequence being repeated once in each of the plurality of subframes.

In one possible design, the wireless communication apparatus in the second aspect and the fourth aspect is a semiconductor chip, and the semiconductor chip is provided in a terminal device.

In one possible design, the wireless communication apparatus in the first and third aspects is a terminal device, and further comprises a receiving unit configured to receive complex-valued symbols mapped onto resource elements of a plurality of special subframes.

Embodiments of the present application also provide a computer-readable storage medium having program code stored therein, which when executed by a wireless communication apparatus, causes the wireless communication apparatus to:

Embodiments of the present application also provide a computer program product comprising program code that, when executed by a wireless communication device, causes the wireless communication device to:

Drawings

Fig. 1a is a schematic diagram of configuration of TDD special subframe support;

FIG. 1b is a schematic diagram of a system architecture suitable for use in the embodiments of the present application;

fig. 2 is a schematic diagram of NB-IoT supported 3 deployment patterns;

fig. 3 is a schematic diagram illustrating mapping of complex-valued symbols of NPDCCH onto resource elements of a subframe in different modes;

fig. 4a is a schematic diagram of mapping a complex-valued symbol sequence to resource elements of a downlink subframe in the prior art;

FIG. 4b is a diagram illustrating a complex-valued symbol sequence mapped to resource elements of a special subframe in the prior art;

fig. 5 is a flowchart illustrating a wireless communication method according to an embodiment of the present application;

FIG. 6a is a diagram of a repeated transmission of a complex-valued symbol sequence;

FIG. 6b is a diagram illustrating mapping of transformed complex-valued symbol sequences onto resource elements of a special subframe;

FIG. 6c is another schematic diagram of mapping the transformed complex-valued symbol sequence to resource elements of a special subframe;

FIG. 7a is another schematic diagram of mapping a transformed complex-valued symbol sequence to resource elements of a special subframe;

FIG. 7b is another schematic diagram of mapping the transformed complex-valued symbol sequence to resource elements of a special subframe;

FIG. 7c is another schematic diagram of mapping the transformed complex-valued symbol sequence to resource elements of a special subframe;

fig. 8 is a flowchart illustrating a wireless communication method according to a second embodiment of the present application;

fig. 9 is a schematic structural diagram of a wireless communication device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of another wireless communication apparatus according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of another wireless communication apparatus according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of another wireless communication apparatus according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of another wireless communication apparatus according to an embodiment of the present application.

Detailed Description

The embodiments of the present application will be described in detail below with reference to the drawings attached to the specification.

Fig. 1b is a schematic diagram of a system architecture applicable to the embodiment of the present application. As shown in fig. 1b, the system architecture includes an access network device 101, one or more terminal devices, such as terminal device 1021, terminal device 1022, and terminal device 1023 shown in fig. 1 b. Access network device 101 may transmit downlink data to terminal device 1021, terminal device 1022, and terminal device 1023 through the network, and terminal device 1021, terminal device 1022, and terminal device 1023 may transmit uplink data to access network device 101 through the network.

In this embodiment, the access network device may be a base station device (BS), and the base station device may also be referred to as a base station, which is a device deployed in a radio access network to provide a wireless communication function. For example, an apparatus for providing a base station function in a 2G network includes a Base Transceiver Station (BTS) and a Base Station Controller (BSC), an apparatus for providing a base station function in a 3G network includes a node B (NodeB) and a Radio Network Controller (RNC), an apparatus for providing a base station function in a 4G network includes an evolved node B (eNB), and an apparatus for providing a base station function in a 5G network includes a new radio node B (gNB), a Centralized Unit (CU), a distributed unit (distributed unit), and a new radio controller.

The terminal equipment is equipment with a wireless transceiving function, can be deployed on land and comprises an indoor or outdoor, a handheld or a vehicle-mounted terminal; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal device may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal device in industrial control (industrial control), a wireless terminal device in self driving (self driving), a wireless terminal device in remote medical treatment (remote medical), a wireless terminal device in smart grid (smart grid), a wireless terminal device in transportation safety (transportation safety), a wireless terminal device in smart city (smart city), a wireless terminal device in smart home (smart home), and the like.

In the embodiment of the present application, the system architecture illustrated in fig. 1b is mainly used as an example for description, but is not limited thereto.

The communication system to which the above system architecture is applicable includes but is not limited to: time division duplex-long term evolution (TDD LTE), frequency division duplex-long term evolution (FDD LTE), long term evolution-enhanced (LTE-a), NB-IoT systems, and various wireless communication systems for future evolution, such as fifth generation (5 th generation) (LTE-a)^thgeneration, 5G) mobile communication system.

For an NB-IoT system, the system bandwidth is 180kHz (i.e., 12 subcarriers with a subcarrier spacing of 15kHz), and 3 deployment modes, a stand-alone mode (standby), a guard-band mode (guard band), and an in-band mode (inbound) are supported. Wherein, the standalone operation mode refers to that the NB-IoT is deployed outside a global system for mobile communication (GSM) system bandwidth or an LTE system bandwidth, as shown in (a) of fig. 2; the guardband operating mode refers to NB-IoT deployed within the guard band of the GSM system bandwidth or the LTE system bandwidth, as shown in (b) of fig. 2; the in-band operation mode refers to NB-IoT deployment within the GSM system bandwidth or the LTE system bandwidth, as shown in (c) of fig. 2.

Taking NB-IoT Physical Downlink Control Channel (PDCCH) (i.e., NPDCCH) as an example, one Control Channel Element (CCE) (i.e., NCCE) in FDD NB-IoT occupies 6 subcarriers in the frequency domain, one subframe in the time domain, and the NPDCCH of FDD NB-IoT is mapped to 1 or 2 CCEs. The number of NPDCCH repetitions may be any one of 1,2,4,8,16,32,64,128,256,512,1024, 2048.

As shown in fig. 3, it is a schematic diagram that complex-valued symbols (complex-valued symbols) of NPDCCH are mapped onto Resource Elements (REs) of a subframe in the independent operation mode or the guard-band operation mode. Specifically, the mapping rule of the downlink subframe is as follows: when the complex-valued symbol sequence y (0), …, y (M-1) is mapped, starting from y (0), the complex-valued symbol sequence is mapped to each available resource element of the downlink subframe in the order of increasing the frequency domain first and then increasing the time domain later. That is, the resource elements occupied by the reference signals in the downlink subframe are not counted in the mapped resource elements, i.e. the resource elements occupied by the reference signals are skipped. The complex-valued symbol sequence includes a plurality of complex-valued symbols, and each complex-valued symbol carries an information bit to be transmitted.

In one example, NPDCCH occupies 2 NCCEs, the complex symbol sequence of NPDCCH is y (0), …, y (M-1), and in the independent operation mode, for example, the resource elements occupied by NB-IoT reference signals need to be skipped in the middle, as shown in fig. 4a, where M is 152. If the mode is the in-band working mode, the resource elements occupied by the LTE reference signal and the resource elements occupied by the LTE PDCCH need to be skipped.

However, in the TDD system, when NPDCCH is mapped to a special subframe, GP and UpPTS cannot be used to transmit downlink signals due to the presence of GP and UpPTS. Taking downlink subframe configuration #1 and special subframe configuration #2 as an example, as shown in fig. 4b, the last 4 symbols cannot be used for transmitting complex-valued symbols. Assuming that the number of repetitions of NPDCCH is 8, that is, NPDCCH is repeatedly transmitted over 8 subframes (including 5 downlink subframes and 3 special subframes), in the entire repetition process, complex-valued symbols y (0), y (1), …, y (111) transmitted by the first 10 symbols are repeated 8 times, and complex-valued symbols y (112), y (113), …, y (151) transmitted by the last 4 symbols are repeated 5 times. However, since the repetition times of the complex-valued symbols y (112), y (113), …, and y (151) are few, the signal-to-noise ratio after combining is lower than that of the complex-valued symbols y (0), y (1), …, and y (111), so that the signal-to-noise ratio after overall combining is limited by the signal-to-noise ratios of the complex-valued symbols y (112), y (113), …, and y (151), and the demodulation performance of the NPDCCH is reduced.

Based on this, the embodiment of the present application provides a wireless communication method, which is used for solving the technical problem that the demodulation performance is poor in the existing data transmission process.

Example one

Fig. 5 is a flowchart illustrating a wireless communication method according to an embodiment of the present application, executed by a wireless communication apparatus, as shown in fig. 5, including:

step 501, generating a complex-valued symbol sequence, where the complex-valued symbol sequence includes a plurality of complex-valued symbols.

Step 502, mapping the complex-valued symbol sequence to resource elements of a plurality of subframes, wherein each resource element corresponds to one complex-valued symbol.

Here, mapping the complex-valued symbol sequences to the resource elements of the plurality of subframes, respectively, means repeatedly mapping the complex-valued symbol sequences to the resource elements of the plurality of subframes. Taking the example of mapping the complex-valued symbol sequences y (0), …, y (M-1) to the resource elements of 3 subframes, respectively, it means that: the complex-valued symbol sequence y (0), …, y (M-1) is mapped to resource elements of the 1 st subframe, and the complex-valued symbol sequence y (0), …, y (M-1) is mapped to resource elements of the 2 nd subframe, and the complex-valued symbol sequence y (0), …, y (M-1) is mapped to resource elements of the 3 rd subframe.

Optionally, as an example of downlink transmission, when the wireless communication apparatus is a base station, the method may further include step 503, where the complex-valued symbol sequence is repeatedly transmitted in the plurality of subframes, and the complex-valued symbol sequence is repeated once in each subframe of the plurality of subframes.

Wherein the plurality of subframes includes a first subframe and a second subframe, an order of complex valued symbols mapped onto resource elements of the first subframe is different from an order of complex valued symbols mapped onto resource elements of the second subframe.

Specifically, the multiple subframes include at least one ordinary subframe, and when the complex-valued symbol sequence is mapped to the resource elements of the ordinary subframe, each complex-valued symbol of the complex-valued symbol sequence may be mapped to each available resource element of the ordinary subframe in an order of increasing a frequency domain first and then increasing a time domain. Taking downlink transmission as an example, the available resource elements of the downlink subframe are resource elements except the resource elements occupied by the reference signal.

The plurality of subframes comprise at least one special subframe, and when the complex value symbol sequence is mapped to the resource elements of the special subframe, the complex value symbol sequence can be subjected to sequence transformation, wherein the sequence of modulation symbols in the complex value symbol sequence subjected to the sequence transformation is different from the sequence of modulation symbols in the complex value symbol sequence; and mapping each complex value symbol of the complex value symbol sequence after the sequence transformation to each available resource element of the special subframe in the sequence of increasing the frequency domain first and then increasing the time domain. For downlink transmission, the available resource elements of the special subframe are resource elements used for downlink transmission except the resource elements occupied by the reference signal.

In the embodiment of the present application, there are various ways of performing sequence transformation on complex-valued symbols.

In one possible implementation, the sequence is transformed into a cyclic shift operation, and a cyclic shift size of the cyclic shift operation is associated with a subframe Number of a special subframe mapped by the complex-valued symbol sequence and/or a System Frame Number (SFN) of a Frame in which the special subframe mapped by the complex-valued symbol sequence is located.

Further, the formula of the sequence transformation is equivalent to the following formula:

z(i)＝y((i+N_CS)modM),i＝0,1,…,M-1

wherein y (0), …, y (M-1) represents the complex-valued symbol sequence, z (0), …, z (M-1) represents the complex-valued symbol sequence after the sequence transformation, M is the number of complex-valued symbols in the complex-valued symbol sequence, N is the number of complex-valued symbols in the complex-valued symbol sequence, and_CSfor the size of the cyclic shift, N_CSThe subframe number of the special subframe mapped by the complex value symbol sequence and/or the system frame number of the frame in which the special subframe mapped by the complex value symbol sequence is positionedAnd (6) associating.

Case 1: n is a radical of_CSAssociated with the system frame number of the frame where the special subframe mapped by the complex value symbol sequence is positioned

For case 1, in one example, the size of the cyclic shift, N_CSThe following formula is satisfied:

wherein P is associated with the number of resource elements used for protection and uplink transmission in the special subframe mapped by the complex-valued symbol sequence; n is_fAnd the system frame number of the frame where the special subframe mapped by the complex value symbol sequence is located.

In a specific implementation, P may be the number of resource elements, except for the resource elements occupied by the reference signal, in the resource elements used for protection and uplink transmission, taking special subframe configuration #2 as an example, the number of resource elements used for protection and uplink transmission is 48, and the number of resource elements occupied by the reference signal in the resource elements used for protection and uplink transmission is 8, in this case, the value of P may be 48-8 — 40.

In yet another example, the size of the cyclic shift, N_CSThe following formula is satisfied:

wherein, N is the number of resource elements used for protection and uplink transmission in the special subframe mapped by the complex value symbol sequence, that is, the number of resource elements occupied by a guard interval (GP) and an uplink pilot time slot (UpPTS).

For example, the following downlink subframe configuration #1, the special subframe configuration #2 are taken as an example, M is 152, N is 48, the repetition number of the complex-valued symbol sequence is 8, as shown in fig. 6a, the diagram is a schematic diagram of repeated transmission of the complex-valued symbol sequence, and the complex-valued symbol sequence is repeatedly transmitted in 8 subframes (5 downlink subframes and 3 special subframes) in total. When the complex-valued symbol sequence is mapped to the downlink subframe, each complex-valued symbol of the complex-valued symbol sequence may be directly mapped to each available resource element of the downlink subframe in the order of increasing the frequency domain first and then increasing the time domain, as shown in fig. 4a, which is not described in detail.

When the complex value symbol sequence is mapped to the 1 st special subframe, the system frame number of the frame where the 1 st special subframe is located is 1, and the size N of the cyclic shift is obtained according to the formula_CSComprises the following steps:

at this time, the transformed sequence is y (48), …, y (151), y (0), y (1), …, y (47), and each complex-valued symbol of the transformed sequence is mapped to each available resource element of the 1 st special subframe in the order of increasing frequency domain first and increasing time domain later, as shown in fig. 6 b.

When the complex-valued symbol sequence is mapped to the 2 nd special subframe, the system frame number of the frame where the 2 nd special subframe is located is still 1, and specific reference may be made to the description of the 1 st special subframe, which is not described herein again.

When the complex value symbol sequence is mapped to the 3 rd special subframe, the system frame number of the frame where the 3 rd special subframe is located is still 2, and the size N of the cyclic shift is obtained according to the formula_CSComprises the following steps:

at this time, the transformed sequence is y (96), …, y (151), y (0), y (1), …, y (95), and each complex-valued symbol of the transformed sequence is mapped to each available resource element of the 3 rd special subframe in the order of increasing frequency domain first and increasing time domain later, as shown in fig. 6 c.

N_CS＝N·n_f

at this time, for the above example, when the complex-valued symbol sequence is mapped to the 1 st and 2 nd special subframes, the size N of the cyclic shift is_CSFor 48, the size of the cyclic shift N when mapping the complex-valued symbol sequence onto the 3 rd special subframe_CSIs 96.

N_CS＝(M-N)·n_f

at this time, for the above example, when the complex-valued symbol sequence is mapped to the 1 st and 2 nd special subframes, the size N of the cyclic shift is_CS152-48-104, size N of cyclic shift when mapping complex-valued symbol sequence onto 3 rd special subframe_CS＝(152-48)·2＝208。

N_CS＝((M-N)·n_f)modM

at this time, for the above example, when the complex-valued symbol sequence is mapped to the 1 st and 2 nd special subframes, the size N of the cyclic shift is_CS(152-48) mod152 ═ 104, the size N of the cyclic shift when mapping the complex-valued symbol sequence onto the 3 rd special subframe_CS＝((152-48)·2)mod152＝56。

In yet another example, one period N may be set_periodSize N of cyclic shift_CSThe following formula is satisfied:

wherein N is_periodThe value of (c) may be configured by the base station or specified by a protocol, for example, may be 40 ms.

Case 2: n is a radical of_CSThe system frame number of the frame where the special subframe mapped by the complex value symbol sequence is located and the subframe of the special subframe mapped by the complex value symbol sequenceFrame number association

For case 2, in one example, the size of the cyclic shift, N_CSThe following formula is satisfied:

wherein, N is the number of resource elements for protection and uplink transmission in the special sub-frame mapped by the complex value symbol sequence, N is_fThe system frame number n of the frame in which the special subframe mapped by the complex value symbol sequence is positioned_sThe slot number of the special sub-frame to which the complex-valued symbol sequence is mapped,

and the subframe number of the special subframe mapped by the complex value symbol sequence.

Still taking fig. 6a as an example, the complex-valued symbol sequence is repeatedly transmitted in 8 subframes (5 downlink subframes and 3 special subframes), where the subframe numbers of the 5 downlink subframes are sequentially 0,4,5,9,0, and the subframe numbers of the 3 special subframes are sequentially 1,6, 1.

When the complex value symbol sequence is mapped to the 1 st special subframe, the system frame number of the frame where the 1 st special subframe is located is 1, the subframe number of the 1 st special subframe is 1, and the size N of the cyclic shift is obtained according to the formula_CSComprises the following steps:

N_CS＝((152-48)·(10+1))mod152＝124

at this time, the transformed sequence is y (124), …, y (151), y (0), y (1), …, y (123), and each complex-valued symbol of the transformed sequence is mapped to each available resource element of the 1 st special subframe in the order of increasing frequency domain first and increasing time domain later, as shown in fig. 7 a.

When the complex value symbol sequence is mapped to the 2 nd special subframe, the system frame number of the frame where the 2 nd special subframe is located is 1, the subframe number of the 2 nd special subframe is 6, and the size N of the cyclic shift is obtained according to the formula_CSComprises the following steps:

N_CS＝((152-48)·(10+6))mod152＝56

at this time, the transformed sequence is y (56), …, y (151), y (0), y (1), …, y (55), and each complex-valued symbol of the transformed sequence is mapped to each available resource element of the 2 nd special subframe in the order of increasing frequency domain first and increasing time domain later, as shown in fig. 7 b.

When the complex value symbol sequence is mapped to the 3 rd special subframe, the system frame number of the frame where the 3 rd special subframe is located is 2, the subframe number of the 3 rd special subframe is 1, and the size N of the cyclic shift is obtained according to the formula_CSComprises the following steps:

N_CS＝((152-48)·(20+1))mod152＝140

at this time, the transformed sequence is y (140), …, y (151), y (0), y (1), …, and y (139), and then each complex-valued symbol of the transformed sequence is mapped to each available resource element of the 2 nd special subframe in the order of increasing the frequency domain first and increasing the time domain later, which is not specifically shown.

the above list specifically lists N_CSThe frame where the special subframe mapped by the complex value symbol sequence is locatedThe specific formula of associating the system frame number with the subframe number of the special subframe in the embodiment of the present application is not limited thereto.

In the above implementation, the embodiment of the present application is directed to the size N of the cyclic shift_CSWithout being particularly limited, the size N of the cyclic shift described above_CSThe formulas that are satisfied are some possible examples in the specific embodiment, the size N of the cyclic shift_CSOther possible formulas or rules may also be satisfied and are within the scope of the present invention.

In another possible implementation, the formula of the sequence transformation is equivalent to the following formula:

wherein y (0), …, y (M-1) represents the complex-valued symbol sequence, z (0), …, z (M-1) represents the complex-valued symbol sequence after the sequence transformation, M is the number of complex-valued symbols in the complex-valued symbol sequence, X is an integer, and X is greater than or equal to 0 and less than or equal to M, the value of X when the complex-valued symbol sequence mapped to the resource element of the first special subframe is subjected to the sequence transformation is different from the value of X when the complex-valued symbol sequence mapped to the resource element of the second special subframe is subjected to the sequence transformation; p is associated with the number of resource elements for protection and for uplink transmission in the special subframe to which the complex-valued symbol sequence is mapped.

In this implementation, the complex-valued symbols y (X), …, y (X + P-1) are complex-valued symbols that do not participate in the mapping (or are unmapped). Still taking downlink subframe configuration #1 and special subframe configuration #2 as an example, if M is 152, to ensure that each available resource element in the special subframe can be effectively utilized, the value of P may be less than or equal to the number (i.e. 40) of resource elements (other than the resource element occupied by the reference signal) in the resource elements for protection and uplink transmission, so as to avoid the problem that some available resource elements are not effectively utilized due to too many unmapped complex-valued symbols. Further, when the value of P is the number of resource elements other than the resource elements occupied by the reference signal in the resource elements for protection and uplink transmission, the number of the available resource elements of the mapped complex-valued symbols is the same, and the complex-valued symbols and the available resource elements are in one-to-one correspondence, so that the phenomenon that some complex-valued symbols are mapped to the resource elements for protection and uplink transmission although participating in mapping can be avoided. The following description will take the value of P as the number of resource elements, except the resource element occupied by the reference signal, in the resource elements for protection and uplink transmission as an example.

In one example, X satisfies the following formula:

still taking fig. 6a as an example, when the complex-valued symbol sequence is mapped to the 1 st special subframe, the system frame number of the frame where the 1 st special subframe is located is 1, and the following formula is obtained according to the above formula:

at this time, the transformed sequence is y (0), y (1), …, y (39), y (80), …, y (151), and each complex-valued symbol of the transformed sequence is mapped to each available resource element of the 1 st special subframe in the order of increasing frequency domain first and increasing time domain later, as shown in fig. 7 c.

When the complex-valued symbol sequence is mapped to the 2 nd special subframe, the system frame number of the frame where the 2 nd special subframe is located is 1, and specific reference may be made to the description of the 1 st special subframe, which is not described herein again.

When the complex-valued symbol sequence is mapped to the 3 rd special subframe, the system frame number of the frame where the 3 rd special subframe is located is 2, and the complex-valued symbol sequence is obtained according to the formula:

at this time, the transformed sequence is y (0), y (1), …, y (79), y (120), …, and y (151), and then each complex-valued symbol of the transformed sequence is mapped to each available resource element of the 1 st special subframe in the order of increasing frequency domain first and increasing time domain later, which is not specifically shown.

In yet another example, X satisfies the following equation:

in yet another example, X satisfies the following equation:

it should be noted that, in the foregoing implementation manner, the value of X is not specifically limited in the embodiment of the present application, and the formulas that X satisfies are all some possible examples in the specific embodiment, and in other embodiments, X may also satisfy other possible formulas or rules, and all of them are within the protection scope of the present invention.

In yet another possible implementation, the formula of the sequence transformation is equivalent to the following formula:

still taking fig. 6a as an example, when the complex-valued symbol sequence is mapped to the 1 st special subframe, and the system frame number of the frame in which the 1 st special subframe is located is 1, the transformed sequence is y (151), y (150), …, y (0) according to the above formula. And then mapping each complex value symbol of the transformed sequence to each available resource element of the 1 st special subframe in the sequence of increasing the frequency domain first and then increasing the time domain.

When the complex-valued symbol sequence is mapped to the 3 rd special subframe, if the system frame number of the frame where the 3 rd special subframe is located is 2, the transformed sequence is y (0), …, y (151) according to the above formula. And then mapping each complex value symbol of the transformed sequence to each available resource element of the 3 rd special subframe in the sequence of increasing the frequency domain first and then increasing the time domain.

It should be noted that, there are many implementations of the sequence transformation in the embodiment of the present application, and it is only one possible implementation to implement the sequence transformation by executing the above formula, and there may be other implementations in the embodiment of the present application, for example, a table of correspondence between y (0), …, y (M-1) and y (0), …, and y (M-1) is stored in advance, as shown in table 2.

Table 2: sequence transformation correspondence relation example

z(0)	y(10)
		z(1)	y(11)
…	…
		z(M-11)	y(M-1)
z(M-10)	y(0)
		z(M-9)	y(1)
…	…
		z(M-1)	y(9)

As shown in table 2: z (0) for y (10), z (1) for y (11), … …, z (M-10) for y (0), … …, z (M-1) for y (9). In this way, when performing sequence conversion, a sequence after the sequence conversion can be obtained by looking up a table.

In this embodiment of the present application, before performing sequence transformation on the complex-valued symbol sequence mapped to the resource element of the special subframe, the method further includes: determining that the repetition number of the complex-valued symbol sequence is greater than or equal to a preset threshold, where the preset threshold may be configured by the base station and notified to the terminal, or may be predefined by a protocol, and is not particularly limited. In this embodiment of the present application, when a complex-valued symbol sequence is repeated once in each subframe, the number of subframes to which the complex-valued symbol sequence is mapped is the number of repetitions of the complex-valued symbol sequence.

Considering that when the repetition times of the complex value symbol sequence are smaller than a preset threshold, the repetition times are fewer, the difference between the repetition times of the complex value symbols in the complex value symbol sequence is not large, and the influence on the demodulation performance is smaller, so that the sequence transformation of the complex value symbol sequence is not needed, and each complex value symbol of the complex value symbol sequence is directly mapped to each available resource element of the special subframe in the sequence of increasing the frequency domain first and then increasing the time domain. When the repetition times of the complex-valued symbol sequence are greater than or equal to the preset threshold, it indicates that the repetition times are more, and the repetition times of part of the complex-valued symbols in the complex-valued symbol sequence are obviously less than the repetition times of other complex-valued symbols according to the existing mode, which results in poor demodulation performance of NB-IoT data transmission.

It should be noted that the wireless communication method in the embodiment of the present application may be applied to multiple signal transmissions, and the above description is only described by taking NPDCCH as an example; in other embodiments, the wireless communication method in the embodiment of the present application may also be applied to other signal transmissions, such as a Physical Downlink Shared Channel (PDSCH). Specifically, if the base station repeatedly transmits the complex-valued symbol sequence of NPDSCH in a plurality of subframes and each subframe of the plurality of subframes is repeated once when transmitting NPDSCH, that is, in the same manner as NPDCCH is transmitted, the above-described wireless communication method can be fully applied. If the base station transmits the NPDSCH, the complex-valued symbol sequence of the NPDSCH is repeatedly transmitted in a plurality of subframes, and every two (or more than two) subframes of the plurality of subframes are repeated once, at this time, every two subframes can be regarded as a subframe combination, and the processing can be performed based on the above-described concept of the wireless communication method.

In the first embodiment, a processing procedure of sending a downlink signal to a terminal device by a base station is specifically described by taking downlink transmission as an example, and a process of receiving a downlink signal by a terminal device corresponding to the process is specifically described below with reference to the second embodiment.

Example two

Fig. 8 is a flowchart illustrating a wireless communication method according to a second embodiment of the present application, executed by a wireless communication apparatus, as shown in fig. 8, including:

step 801, obtain a first complex-valued symbol sequence mapped onto resource elements of a special subframe. Here, the first complex-valued symbol sequence is z (0), …, z (M-1) in the first embodiment.

Step 802, performing sequence transformation on the first complex-valued symbol sequence according to the sequence of the complex-valued symbols mapped to the resource elements of the special subframe to obtain second complex-valued symbol sequences mapped to the resource elements of the special subframes respectively. Wherein the plurality of special subframes includes a first special subframe and a second special subframe, an order of complex-valued symbols mapped onto resource elements of the first special subframe is different from an order of complex-valued symbols mapped onto resource elements of the second special subframe.

Here, the second complex-valued symbol sequences mapped to the resource elements of the special subframes are complex-valued symbol sequences y (0), …, y (M-1) in the above embodiment.

It should be noted that the complex-valued symbols mapped to resource elements of multiple subframes are received by the terminal device from the base station, where the multiple subframes include at least one normal subframe and/or at least one special subframe, and since the implementation process of the terminal device receiving the complex-valued symbols mapped to resource elements of the normal subframe may refer to the prior art, the implementation process of the terminal device receiving the complex-valued symbols mapped to resource elements of the special subframe is mainly described in this embodiment.

Specifically, the terminal equipment obtains a first complex-valued symbol sequence mapped to the resource elements of the special subframe in the sequence of increasing the frequency domain first and then increasing the time domain; here, the first complex-valued symbol sequence is the complex-valued symbol sequence z (0), …, z (M-1) after sequence transformation in the first embodiment. Furthermore, the terminal device may perform sequence transformation on the first complex-valued sequence number sequence according to the sequence of the complex-valued symbols mapped to the resource elements of the plurality of special subframes, to obtain the second complex-valued symbol sequence.

In a possible implementation manner, a preset rule may be configured by the base station, where the preset rule is used to indicate an order of the complex-valued symbols mapped to the resource elements of the special subframe, and notify the preset rule to the terminal device, so that after the terminal device receives the complex-valued symbols mapped to the resource elements of the special subframe, the terminal device may determine the order of the complex-valued symbols mapped to the resource elements of the special subframe according to the preset rule.

For example, the base station performs a cyclic shift operation on the complex-valued symbol sequence, and maps each complex-valued symbol of the complex-valued symbol sequence subjected to the cyclic shift operation to the special subframe, so that after the terminal device obtains the first complex-valued symbol sequence, the terminal device may perform a cyclic shift operation on the first complex-valued symbol sequence (the cyclic shift operation is an inverse process of the cyclic shift operation performed by the base station) to obtain the second complex-valued symbol sequence.

In one example, the formula for the sequence transformation is equivalent to the following formula:

z(i)＝y((i+N_CS)modM),i＝0,1,…,M-1

For example, M152, N_CSWhen the symbol sequence is 48, the first complex-valued symbol sequence is subjected to sequence transformation according to the above formula, and the second complex-valued symbol sequence is obtained as z (104), …, z (151), z (0), …, and z (103), that is, y (0) corresponds to z (104), y (1) corresponds to z (105), … …, y (47) corresponds to z (151), y (48) corresponds to z (0), and … …, and y (151) corresponds to z (103).

It should be noted that, since the number of available resource elements of the special subframe may be smaller than the number of complex-valued symbols in the complex-valued symbol sequence, the number of complex-valued symbols mapped on the available resource elements of the special subframe may be smaller than M, but does not affect the execution of the above sequence transformation.

Therefore, the terminal equipment can combine and add the complex value symbol sequence obtained according to the sequence mode and the complex value symbol sequence mapped on the resource elements of the common subframe, and then demodulate the complex value symbol sequence.

For the above method flow, the embodiment of the present application further provides a wireless communication device, and for specific implementation of the wireless communication device, reference may be made to the above method flow.

Fig. 9 is a schematic structural diagram of a wireless communication device according to an embodiment of the present application, the wireless communication device is configured to execute the process illustrated in fig. 5, the wireless communication device may be a semiconductor chip, and as shown in fig. 9, the wireless communication device 900 includes:

a processing unit 901 configured to generate a complex-valued symbol sequence, where the complex-valued symbol sequence includes a plurality of complex-valued symbols;

a mapping unit 902, configured to map the complex-valued symbol sequence to resource elements of multiple special subframes, where each resource element corresponds to one complex-valued symbol;

In one possible design, the mapping unit 902 is specifically configured to:

z(i)＝y((i+N_CS)modM),i＝0,1,…,M-1

In one possible design of the system, the system may be,

the formula of the sequence transformation is equivalent to the following formula:

Fig. 10 is a schematic structural diagram of another wireless communication device provided in an embodiment of the present application, where the wireless communication device may be a base station, and the wireless communication device 1000 includes a processing unit 1001, a mapping unit 1002, and a transmitting unit 1003; wherein, the function implemented by the processing unit 1001 is the same as that implemented by the processing unit 901, the function implemented by the mapping unit 1002 is the same as that implemented by the mapping unit 902, and the transmitting unit 1003 is configured to repeatedly transmit the complex-valued symbol sequence in the plurality of subframes, where the complex-valued symbol sequence is repeated once in each of the plurality of subframes.

Fig. 11 is a schematic structural diagram of another wireless communication device according to an embodiment of the present application, the wireless communication device is configured to execute the process illustrated in fig. 8, the wireless communication device may be a semiconductor chip, and as shown in fig. 11, the wireless communication device 1100 includes:

a processing unit 1101, configured to obtain a first complex-valued symbol sequence mapped onto resource elements of a special subframe;

a transforming unit 1102, configured to perform sequence transformation on the first complex-valued symbol sequence according to an order of complex-valued symbols mapped to resource elements of the special subframe, so as to obtain second complex-valued symbol sequences mapped to resource elements of a plurality of special subframes, respectively;

z(i)＝y((i+N_CS)modM),i＝0,1,…,M-¹

Fig. 12 is a schematic structural diagram of another wireless communication apparatus provided in an embodiment of the present application, where the wireless communication apparatus may be a terminal device, and the wireless communication apparatus 1200 includes a processing unit 1201, a transforming unit 1202, and a receiving unit 1203; the processing unit 1201 has the same function as the processing unit 1101 described above, the transforming unit 1202 has the same function as the transforming unit 1102 described above, and the receiving unit 1203 is configured to receive complex-valued symbols mapped to resource elements of a plurality of special subframes.

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. The functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Fig. 13 is a schematic structural diagram of another wireless communication device according to an embodiment of the present application, where the wireless communication device may be a base station. As shown in fig. 13, the wireless communication apparatus 1300 includes: a communication module 1301, a processor 1302;

the communication module 1301 is configured to perform communication interaction with other devices.

The communication module 1301 may be an RF circuit, a Wi-Fi module, a communication interface, a bluetooth module, etc.

The processor 1302 is configured to implement the step flow of the above method embodiment.

Optionally, the communications apparatus 1300 may further include: the memory 1304 stores programs and the like. In particular, the program may comprise program code comprising instructions. The memory 1304 may comprise RAM, and may also include non-volatile memory, such as at least one disk memory. The processor 1302 executes the application programs stored in the memory 1304 to implement the above-described functions.

In one possible approach, communication module 1301, processor 1302, and memory 1304 are communicatively coupled. For example, the communication module 1301, the processor 1302, and the memory 1304 may be connected to each other by a bus 1303; the bus 1303 may be a PCI bus or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 13, but this is not intended to represent only one bus or type of bus.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. A method of wireless communication, the method being performed by a wireless communication apparatus, the method comprising:

2. The method of claim 1, wherein the mapping the complex-valued symbol sequences onto resource elements of a plurality of special subframes, respectively, comprises:

3. The method of claim 2, wherein:

the sequence is transformed into a cyclic shift operation, and the cyclic shift size of the cyclic shift operation is associated with the subframe number of the special subframe mapped by the complex-valued symbol sequence and/or the system frame number of the frame in which the special subframe mapped by the complex-valued symbol sequence is located.

4. The method of claim 3, wherein the formula of the sequence transformation is equivalent to the following formula:

z(i)＝y((i+N_CS)modM),i＝0,1,…,M-1

5. The method of claim 4, wherein a size N of the cyclic shift_CSThe following formula is satisfied:

6. The method of claim 4, wherein a size N of the cyclic shift_CSThe following formula is satisfied:

7. The method of claim 2, wherein the formula of the sequence transformation is equivalent to the following formula:

wherein y (0), …, y (M-1) represents the complex-valued symbol sequence, z (0), …, z (M-1) represents the complex-valued symbol sequence after the sequence transformation, M is the number of complex-valued symbols in the complex-valued symbol sequence, X is an integer, and X is greater than or equal to 0 and less than or equal to M, and the value of X when the complex-valued symbol sequence mapped to the resource element of the first special subframe is subjected to the sequence transformation is different from the value of X when the complex-valued symbol sequence mapped to the resource element of the second special subframe is subjected to the sequence transformation.

8. A wireless communications apparatus, the wireless communications apparatus comprising:

9. The wireless communications apparatus of claim 8, wherein the mapping unit is specifically configured to:

10. The wireless communication apparatus of claim 9, wherein:

11. The wireless communications apparatus of claim 10, wherein the formula for the sequence transformation is equivalent to the following formula:

z(i)＝y((i+N_CS)modM),i＝0,1,…,M-1

12. The wireless communications apparatus of claim 11, wherein a size N of the cyclic shift_CSThe following formula is satisfied:

13. The wireless communications apparatus of claim 11, wherein a size N of the cyclic shift_CSThe following formula is satisfied:

14. The wireless communications apparatus of claim 9, wherein the formula for the sequence transformation is equivalent to the following formula:

15. A wireless communications apparatus, the wireless communications apparatus comprising:

a processing unit and a storage unit;

16. The wireless communications apparatus of claim 15, wherein:

the wireless communication device is a semiconductor chip that is disposed within a base station.

17. The wireless communication apparatus according to claim 15 or 16, wherein:

the wireless communication device is a base station, and further comprises a transmitting unit configured to repeat transmitting the complex-valued symbol sequence in the plurality of special subframes, the complex-valued symbol sequence being repeated once in each of the plurality of special subframes.

18. A computer-readable storage medium having program code stored therein, which when executed by a wireless communication apparatus, causes the wireless communication apparatus to: