Frame structure design method based on 5G waveform

Abstract

The invention discloses a frame structure design method based on a 5G waveform. The method comprises the steps that a frame structure of a first frame structure type is composed of a synchronization channel, a control channel, a data channel and a guard interval; the synchronization channel is composed of a PSS and an SSS; the frame structure of the second frame structure type is composed of a control channel, a data channel and a guard interval; the number of symbols occupied by the control channels in the first frame structure type and the second structure type is the same; time slots of the first frame structure type and the second frame structure type are defined as static time slots and dynamic time slots respectively, and the proportion of the dynamic time slots in the whole time slots is higher than that of the static time slots in the whole time slots. According to the invention, better anti-interference and anti-fading performance can be obtained in interference and fading scenes of different channels, especially in time-varying interference and fading scenes.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a frame structure design method based on 5G waveform. Background Art

[0002] In the field of wireless communication applications, overcoming the impact of wireless channels is one of the most critical issues in wireless communication technology. Interference and fading in wireless channels are two key factors affecting wireless communication performance. They can significantly impact signal transmission quality, communication reliability, and system capacity, leading to problems such as increased bit error rates, degraded signal quality, communication interruptions, reduced spectrum efficiency, a degraded user experience, limited coverage, and reduced system performance.

[0003] The 5G-NR waveform system and its evolved waveform system support a wide frequency range from low-band to millimeter-wave bands, and its operating bandwidth is relatively wide. For the SUB6 band, it can support an operating bandwidth of up to 100 MHz. Therefore, the impact of interference and fading on the system is very significant.

[0004] The 5G-NR standard waveform system defines the frame structure and individual channel definitions, which effectively reduce the impact of interference and fading in fixed base station deployment scenarios (i.e., base station sites are fixed and unchanging after site planning is completed). However, for mobile base station deployment scenarios (i.e., base station sites are uncertain), especially for special applications and emergency communications, it cannot effectively cope with the impact of interference and fading, especially time-varying interference and fading, including on synchronization channels, control channels, and data channels. In particular, the synchronization channel (SS / PBCH) is essentially not allowed to reselect its time-frequency position to cope with varying interference and fading during the entire operating time after cell activation. Reselecting the time-frequency position is very costly. Summary of the Invention

[0005] In order to solve the impact of interference and fading on the system in the 5G-NR standard waveform system, the present application provides a frame structure design method based on the 5G waveform. In the 5G-NR-based evolution waveform system, it is very important and necessary to design a new frame structure to cope with time-varying interference and fading.

[0006] This application discloses a frame structure design method based on 5G waveform, which includes:

[0007] The frame structures used by the data channel, the synchronization channel and the control channel are divided into a first frame structure type and a second frame structure type; the first frame structure type and the second frame structure type occupy the same number of symbols in the time domain;

[0008] The frame structure of the first frame structure type consists of a synchronization channel, a control channel, a data channel and a guard interval; the synchronization channel consists of a PSS and a SSS;

[0009] The frame structure of the second frame structure type consists of a control channel, a data channel and a guard interval;

[0010] The control channels in the first frame structure type and the second frame structure type occupy the same number of symbols;

[0011] The time slots of the first frame structure type and the second frame structure type are respectively defined as static time slots and dynamic time slots, and the proportion of the dynamic time slots in the entire time slots is higher than the proportion of the static time slots in the entire time slots;

[0012] The minimum resource block in the frequency domain for both the first and second frame structure types is one resource block, and 12 resource units constitute one resource block; in the time domain, a single time slot has a total of 14 symbols.

[0013] Furthermore, the resource mapping of the time-frequency domain of the first frame structure type includes resource mapping of the synchronization channel, control channel, data channel and guard interval. The time-frequency resource mapping of a single time slot occupies 14 symbols in the time domain and 273 resource blocks in the frequency domain. The total number of time-frequency resource units is 273*14; the control channel occupies 1 or 2 symbols in the time domain, and the synchronization channel occupies 2 symbols in the time domain, of which PSS and SSS each occupies 1 symbol; the number of symbols occupied by the data channel in the time domain is determined by the number of symbols of the synchronization channel, control channel and guard interval; the mapping resources of the data channel include the time-frequency resource units occupied by data and pilot respectively.

[0014] Furthermore, for the time-frequency domain resource mapping of the first frame structure type, in the frequency domain, the frequency domain resource mapping position of the synchronization channel is indexed in units of resource blocks, and its frequency domain starting position is an integer multiple of 6 resource blocks; for different working bandwidths, the working frequency band is divided into multiple sub-bands, and a unique PSS frequency domain candidate position and SSS frequency domain candidate position are defined in each sub-band, and all PSS frequency domain candidate positions and SSS frequency domain candidate positions constitute the frequency domain candidate set of the synchronization channel; the frequency domain resources of the synchronization channel are defined on the synchronization grid; when calculating the frequency domain starting position of the synchronization channel, the starting resource block of the synchronization channel is aligned to the corresponding resource block on the frequency grid and used as the starting resource block of the synchronization channel.

[0015] Furthermore, for the time-frequency domain resource mapping of the first frame structure type, in the frequency domain, the frequency domain resource mapping position of the control channel is indexed in units of resource blocks, and the frequency domain resource mapping position of the control channel is determined by the resource block index of the frequency domain resource mapping position of the synchronization channel, that is, the resource block index value of the frequency domain resource mapping position of the synchronization channel is added with an offset value to obtain the frequency domain starting position of the mapped resource block of the control channel. The offset value is an integer, the unit is resource block, and the specific value is specified by the high-level parameter;

[0016] For the time-frequency mapping of the first frame structure type, in the frequency domain, the resource mapping of the data channel occupies at least one resource block, and the maximum number of resource blocks occupied is 273-the number of resource blocks occupied by the synchronization channel; the data channel supports both continuous frequency domain resource mapping and non-continuous frequency domain resource mapping.

[0017] Furthermore, the first frame structure type allows mapping multiple data channels within a single time slot. For the mapped multiple data channels:

[0018] In the frequency domain, the occupied frequency domain resource blocks are frequency division multiplexed, and their pilot resource blocks and data resource blocks support mapping on one port or two ports; in the time domain, the number of occupied symbols is determined by the number of symbols of the synchronization channel, the number of symbols of the control channel, and the number of symbols of the guard interval, that is: the number of symbols occupied by the data channel is 14-the number of symbols of the synchronization channel-the number of symbols of the control channel-the number of symbols of the guard interval.

[0019] Furthermore, in the first frame structure type, there is at least one data channel defined as Type APSCH; the time-frequency resource position of the data channel is determined by the time-frequency position of the synchronization channel, and the time-frequency resource is defined as follows:

[0020] In the frequency domain, resource allocation is based on resource blocks. Continuous resource block allocation is used, occupying N consecutive resource blocks. The frequency domain starting position of the resource block is calculated by the frequency domain starting resource block index value of the synchronization channel, that is, the frequency domain starting resource block index value of the synchronization channel plus an offset value. The offset value is an integer in resource blocks, and the specific value is specified by high-level parameters.

[0021] In the time domain, the number of occupied symbols is: 14 - the number of synchronization channel symbols - the number of control channel symbols - the number of guard interval symbols.

[0022] Furthermore, a data channel of Type A PSCH is used to carry broadcast signaling, and its frequency domain starting position Δ is calculated as follows:

[0023] First, define the resource block index of the center frequency of the synchronization channel on the synchronization grid The value is 0;

[0024] Calculate the starting resource block index of the synchronization channel on the synchronization grid The PSS sequence length occupies 11 or 12 resource blocks in the frequency domain, and the starting resource block index of the synchronization channel is

[0025]

[0026] Calculate the starting resource block index of the synchronization channel on the frequency grid

[0027] According to the starting index of the allocated data channel Calculate Δ: is the offset value.

[0028] Furthermore, the control channel of the second frame structure type occupies the same symbol position in the time domain as the control channel in the first frame structure type, and the control channel of the second frame structure type occupies the same resource block starting position in the frequency domain as the control channel in the first frame structure type;

[0029] The number of symbols occupied by the data channel of the second frame structure type in the time domain = 14 - the number of control channel symbols - the number of symbols in the guard interval. In the frequency domain, the minimum number of resource blocks occupied by the data channel is 1, and the maximum number of resource blocks occupied is 273; both continuous frequency domain resource mapping and non-continuous frequency domain resource mapping are supported.

[0030] Furthermore, the time slot ratio between the first frame structure type and the second frame structure type supports semi-static configuration, which is specifically determined by the period of the first frame structure type;

[0031] The time slot allocation period between the first frame structure type and the second frame structure type is configurable. The value of the period is carried by a specified high-level parameter, which is carried by the signaling carried in the data channel of Type A PSCH. At the same time, the signaling also carries the delay time for the high-level parameter to take effect, in time slots.

[0032] Furthermore, the first frame structure type and the second frame structure type both support different subcarrier sampling intervals;

[0033] As the subcarrier spacing index increases, the time slot length of the radio frame remains unchanged, the length of the radio subframe increases successively, and the length of each time slot increases successively;

[0034] As the subcarrier spacing index increases, the subcarrier spacing increases and the time slot length decreases.

[0035] Due to the adoption of the above technical solution, the present application has the following advantages: a new frame structure designed in the present application based on the evolution of the 5G-NR standard waveform frame structure enables better performance to be obtained under different signal interference and fading scenarios, especially time-varying interference and fading. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0037] Figure 1 This is a schematic diagram of the frame structure composition of the first frame structure type (when the PCCH occupies 1 symbol and 2 symbols) in an embodiment of the present application;

[0038] Figure 2 This is a schematic diagram of the frame structure composition of the second frame structure type (when the PCCH occupies 1 symbol and 2 symbols) in an embodiment of the present application;

[0039] Figure 3 A schematic diagram of the time slot ratio of the first frame structure type and the second frame structure type according to an embodiment of the present application;

[0040] Figure 4 This is a schematic diagram of time-frequency resource mapping of PSS, SSS, PCCH and PSCH of the first frame structure type in an embodiment of the present application;

[0041] Figure 5 Schematic diagram of time-frequency resource mapping of Type A PSCH in the first frame structure type in an embodiment of the present application;

[0042] Figure 6 Schematic diagram of the resource block location of the PSCH carrying signaling in the first frame structure type of an embodiment of the present application;

[0043] Figure 7 This is a schematic diagram of the time-frequency resource mapping of PSS, SSS, PCCH and PSCH of the second frame structure type in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The present application is further described with reference to the accompanying drawings and embodiments. The embodiments described are only a part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field should fall within the scope of protection of the embodiments of the present application.

[0045] The present application provides an embodiment of a frame structure design method based on a 5G waveform, which includes:

[0046] The frame structures used by the data channel (PSCH), synchronization channel (PSS / SSS) and control channel (PCCH) are divided into the first frame structure type (frame structure type I) and the second frame structure type (frame structure type II); the first frame structure type and the second frame structure type occupy the same number of symbols in the time domain; the frame structure of the first frame structure type is composed of a control channel, a data channel and a synchronization channel; the synchronization channel is composed of PSS and SSS; the frame structure of the second frame structure type is composed of a control channel, a data channel and a guard interval (GAP); the number of symbols occupied by the control channel in the first frame structure type and the second structure type is the same; the time slots of the first frame structure type and the second frame structure type are respectively defined as static time slots and dynamic time slots, and the proportion of dynamic time slots in the entire time slot is higher than the proportion of static time slots in the entire time slot; the minimum resource block in the frequency domain of the first frame structure type and the second frame structure type is a resource block, and 12 resource units constitute 1 resource block; in the time domain, a single time slot has a total of 14 symbols.

[0047] Optionally, the resource mapping of the time-frequency domain of the first frame structure type includes resource mapping of the synchronization channel, control channel, data channel and protection interval. The time-frequency resource mapping of a single time slot occupies 14 symbols in the time domain and 273 resource blocks in the frequency domain. The total number of time-frequency resource units is 273*14; the control channel occupies 1 or 2 symbols in the time domain, and the synchronization channel occupies 2 symbols in the time domain, of which PSS and SSS each occupies 1 symbol; the number of symbols occupied by the data channel in the time domain is determined by the number of symbols of the synchronization channel, control channel and protection interval; the mapping resources of the data channel include the time-frequency resource units occupied by data (PSCHDATA) and pilot (DMRS) respectively.

[0048] Optionally, for the time-frequency domain resource mapping of the first frame structure type, in the frequency domain, the frequency domain resource mapping position of the synchronization channel is indexed in units of resource blocks, and its frequency domain starting position is an integer multiple of 6 resource blocks; for different working bandwidths, the working frequency band is divided into multiple sub-bands, and a unique PSS frequency domain candidate position and SSS frequency domain candidate position are defined in each sub-band, and all PSS frequency domain candidate positions and SSS frequency domain candidate positions constitute the frequency domain candidate set of the synchronization channel; the frequency domain resources of the synchronization channel are defined on the synchronization grid; when calculating the frequency domain starting position of the synchronization channel, the starting resource block of the synchronization channel is aligned to the corresponding resource block on the frequency grid and used as the starting resource block of the synchronization channel.

[0049] Optionally, for the time-frequency domain resource mapping of the first frame structure type, in the frequency domain, the frequency domain resource mapping position of the control channel is indexed in units of resource blocks, and the frequency domain resource mapping position of the control channel is determined by the resource block index of the frequency domain resource mapping position of the synchronization channel, that is, the resource block index value of the frequency domain resource mapping position of the synchronization channel is added with an offset value to obtain the frequency domain starting position of the mapped resource block of the control channel, and the offset value is an integer, the unit is resource block, and the specific value is specified by the high-level parameter;

[0050] For the time-frequency mapping of the first frame structure type, in the frequency domain, the resource mapping of the data channel occupies at least one resource block, and the maximum number of resource blocks occupied is 273-the number of resource blocks occupied by the synchronization channel; the data channel supports both continuous frequency domain resource mapping and non-continuous frequency domain resource mapping.

[0051] Optionally, the first frame structure type allows mapping multiple data channels within a single time slot. For the mapped multiple data channels:

[0052] In the frequency domain, the occupied frequency domain resource blocks are frequency division multiplexed, and their pilot resource blocks and data resource blocks support mapping on one port or two ports; in the time domain, the number of occupied symbols is determined by the number of symbols of the synchronization channel, the number of symbols of the control channel, and the number of symbols of the guard interval, that is: the number of symbols occupied by the data channel is 14-the number of symbols of the synchronization channel-the number of symbols of the control channel-the number of symbols of the guard interval.

[0053] Optionally, in the first frame structure type, there is at least one data channel defined as Type A PSCH; the time-frequency resource position of the data channel is determined by the time-frequency position of the synchronization channel, and the time-frequency resource is defined as follows:

[0054] In the frequency domain, resource allocation is based on resource blocks. Continuous resource block allocation is used, occupying N consecutive resource blocks. The frequency domain starting position of the resource block is calculated by the frequency domain starting resource block index value of the synchronization channel, that is, the frequency domain starting resource block index value of the synchronization channel plus an offset value. The offset value is an integer in resource blocks, and the specific value is specified by high-level parameters.

[0055] In the time domain, the number of occupied symbols is: 14 - the number of synchronization channel symbols - the number of control channel symbols - the number of guard interval symbols.

[0056] Optionally, a data channel of Type A PSCH is used to carry broadcast signaling, and its frequency domain starting position Δ is calculated as follows:

[0057] First, define the resource block index of the center frequency of the synchronization channel on the synchronization grid The value is 0;

[0058] Calculate the starting resource block index of the synchronization channel on the synchronization grid The PSS sequence length occupies 11 or 12 resource blocks in the frequency domain, and the starting resource block index of the synchronization channel is

[0059]

[0060] Calculate the starting resource block index of the synchronization channel on the frequency grid

[0061] According to the starting index of the allocated data channel Calculate Δ: is the offset value.

[0062] Optionally, the control channel of the second frame structure type occupies the same symbol position in the time domain as the control channel in the first frame structure type, and the control channel of the second frame structure type occupies the same resource block starting position in the frequency domain as the control channel in the first frame structure type;

[0063] The number of symbols occupied by the data channel of the second frame structure type in the time domain = 14 - the number of control channel symbols - the number of symbols in the guard interval. In the frequency domain, the minimum number of resource blocks occupied by the data channel is 1, and the maximum number of resource blocks occupied is 273; both continuous frequency domain resource mapping and non-continuous frequency domain resource mapping are supported.

[0064] Optionally, the time slot ratio between the first frame structure type and the second frame structure type supports semi-static configuration, which is specifically determined by the period of the first frame structure type;

[0065] The time slot allocation period between the first frame structure type and the second frame structure type is configurable. The value of the period is carried by a specified high-level parameter, which is carried by the signaling carried in the data channel of Type A PSCH. At the same time, the signaling also carries the delay time for the high-level parameter to take effect, in time slots.

[0066] Optionally, the first frame structure type and the second frame structure type both support different subcarrier sampling intervals;

[0067] As the subcarrier spacing index increases, the time slot length of the radio frame remains unchanged, the length of the radio subframe increases successively, and the length of each time slot increases successively;

[0068] As the subcarrier spacing index increases, the subcarrier spacing increases and the time slot length decreases.

[0069] In this embodiment, different frame structures are sampled for the data channel, synchronization channel, and control channel to ensure that each channel can achieve optimal performance. The details are as follows:

[0070] Three types of channels are defined: synchronization channel, control channel, and data channel.

[0071] For the synchronization channel: In the time domain, the synchronization channel occupies 2 OFDM symbols, of which the PSS occupies the second symbol (counting from 0) and the SSS occupies the fourth symbol; in the frequency domain, it occupies 11 or 12 resource blocks. Similar to the 3GPP 5G-NR protocol, the synchronization channel is defined on the synchronization grid, and the boundaries of the resource blocks are integer multiples of 15 kHz.

[0072] For the control channel: In the time domain, the control channel occupies 1 to 2 OFDM symbols. When occupying one symbol, it occupies the 0th symbol (counting from 0); when occupying two symbols, it occupies the 0th and 1st symbols; in the frequency domain, the starting position of the occupied resource block is an integer multiple of CCE (an integer multiple of 6 resource blocks), and the number of resource blocks is 4CCE, 8CCE, and 16CCE.

[0073] For the data channel: In the time domain, the data channel occupies the symbol following the control channel's starting OFDM symbol, up to the last OFDM symbol (the 13th OFDM symbol). The specific number of symbols is determined by the number of synchronization channel, control channel, and guard interval (GAP) symbols: number of data channel symbols = 14 - number of synchronization channel symbols - number of control channel symbols and number of guard interval (GAP) symbols. In the frequency domain, the minimum number of resource blocks is one, and the maximum number of resource blocks is 273 - number of synchronization channel resource blocks. Both contiguous and non-contiguous resource block allocation are supported.

[0074] See also Figure 1 and Figure 2 , defines two types of frame structures, namely: frame structure type I (static time slot) and frame structure type II (dynamic time slot), whose main characteristics are as follows:

[0075] Frame structure type I consists of a synchronization channel, a control channel, a data channel, and a guard interval GAP; frame structure type II consists of a physical control channel, a data channel, and a guard interval GAP.

[0076] The time slot ratio of frame structure type I and frame structure type II supports semi-static configuration, which is determined by the specific fields of the message carried in frame structure type I, such as Figure 3 shown.

[0077] like Figure 3As shown, the period of the static timeslot is configurable, and the period value is carried by high-layer parameters. High-layer parameters generally refer to parameters in L1 and L2 in the 3GPP standard.

[0078] Specifically, similar to the definitions of radio frames, radio subframes, and time slots in the 3GPP 5G-NR standard (Section 4.3 and Table 4.3.2-1 of the 3GPP 38.211 protocol), the physical symbol time unit for the new frame structures (frame structure type I and frame structure type II) is defined as Ts = 1 / (30000 × 4096) seconds. Different subcarrier sampling intervals are supported, with corresponding interval indices ranging from 0 to 4. The definitions of radio frames, radio subframes, and time slots for different subcarrier sampling intervals are shown in Table 1. The lengths of time slots for different subcarrier sampling intervals are defined in Table 2.

[0079] Table 1 Supported subcarrier sampling intervals

[0080]

[0081] Table 2 Supported subcarrier sampling intervals

[0082]

[0083] The time-frequency resource mapping of the two frame structures (frame structure type I and frame structure type II) is defined as follows.

[0084] Regarding frame structure type I:

[0085] For frame structure type I, including: synchronization channel, control channel, data channel and protection interval, for its resource mapping, this application provides one of the implementation examples Figure 4 shown.

[0086] Figure 4 In the time domain, the synchronization channel occupies two OFDM symbols, with the PSS occupying the second symbol (counting from 0) and the SSS occupying the fourth symbol. In the frequency domain, for different operating bandwidths, the operating band is first divided into 20MHz subbands. Within each subband, a frequency domain candidate position is defined for the PSS and SSS. This frequency domain candidate position is located near the center frequency of the corresponding subband. All these candidate PSS and SSS positions form a frequency domain candidate set, and the PSS and SSS in the candidate set each occupy 11 or 12 resource blocks.

[0087] Similar to 3GPP's 5G-NR protocol, the synchronization channel is defined on the synchronization grid, and the boundaries of the resource blocks are integer multiples of 15KHz.

[0088] Figure 4 In the time domain, PCCH occupies 1 to 2 OFDM symbols, such as Figure 4As shown, the PCCH in the left figure occupies symbol 0 (a total of 1 OFDM symbol), and the PCCH in the left figure occupies symbols 0 and 1 (a total of 2 OFDM symbols). In the frequency domain, similar to the 3GPP 5G-NR protocol, CCE and aggregation levels are defined, where 1 CCE = 6 resource blocks, and aggregation levels include 4CCE, 8CCE, and 16CCE. The number of resource blocks occupied by the PCCH is defined by the aggregation level, that is, the number of resource blocks occupied is one of the aggregation levels, and its frequency domain starting resource block is an integer multiple of 6 resource blocks.

[0089] The frequency domain starting position of the PCCH resource block is CCE start as shown in the figure above, and the value is Δ. The Δ value is a relative position, that is, the difference between the starting resource block index of PCCH and the starting resource block index of PSS. Since the frequency of the starting resource block of PSS / SSS is defined on the synchronization grid, it is an integer multiple of 15KHz, and the frequency of the starting resource block of PCCH is defined on the frequency grid, it is an integer multiple of 360KHz, so it is necessary to align the starting resource block of PSS to the frequency grid to obtain the resource block index on the frequency grid, and then calculate Δ based on the resource block index and the starting resource block index of PCCH (frequency grid).

[0090] Figure 4 In the data channel, in the time domain, the data channel occupies the symbol following the control channel symbol, and can extend up to the last OFDM symbol (the 13th OFDM symbol). The specific number of symbols is determined by the number of synchronization channel, control channel, and guard interval symbols: number of data channel symbols = 14 - number of synchronization channel symbols - number of control channel symbols and number of guard interval symbols. The PSCH DMRS time domain symbols occupy the third and seventh OFDM symbols, and the guard interval occupies one OFDM symbol. The PSCH DMRS time domain resource definition is similar to that of the PDSCH in the 3GPP 5G-NR protocol (38.211). In the frequency domain, the minimum number of resource blocks is one, and the maximum number of resource blocks is 273 - number of synchronization channel resource blocks. Similar to the definition in the 3GPP 5G-NR protocol (38.214), both contiguous and non-contiguous resource block allocation (corresponding to RIV and resource block G) are supported.

[0091] Frame structure type I allows mapping of multiple data channels. For all mapped data channels, the details are as follows:

[0092] In the frequency domain, the number of occupied resource blocks is frequency division multiplexing, and its DMRS and data support 1-port and 2-port mapping; in the time domain, the number of occupied OFDM symbols is determined by the number of synchronization channel symbols, the number of control channel symbols, and the number of GAP symbols, that is: the number of PSCH symbols = 14 - the number of synchronization channel symbols - the number of control channel symbols - the number of GAP symbols.

[0093] In frame structure type I, there is at least one data channel, defined as Type A PSCH. The time-frequency resource location of this PSCH is determined by the time-frequency location of the synchronization channel. The detailed time-frequency resource definition is as follows:

[0094] In the frequency domain, the sampling continuous resource block allocation method occupies N consecutive resource blocks. The starting position of the resource block is a relative position, not an absolute position, which is calculated by the parameters of the synchronization channel. Figure 5 As shown. For details, see the description of frame structure type I in the specific implementation method. Different from the definition in 3GPP's 5G-NR (38.214) protocol, the number of occupied resource blocks and the starting position of the resource block are sampled by one byte to indicate the number of occupied resource blocks. The byte samples the LSB mode, where: the lower 4 bits: the value ranges from 0 to 15, which is an enumeration value, corresponding to -7 to 8, indicating the resource block offset of the starting resource block for scheduling PSCH relative to the starting resource block of PSS / SSS; the upper 8 bits: the value ranges from 0 to 255, which is an enumeration value, indicating the number of resource blocks for scheduling PSCH, corresponding to 1 to 256 resource blocks. In the time domain, the number of occupied OFDM symbols is: 14-the number of synchronization channel symbols-the number of control channel symbols-the number of GAP symbols.

[0095] As mentioned above, Type A PSCH is used for broadcast signaling, and its time-frequency resource mapping is as follows: Figure 5 As shown, this figure is one of the embodiments of the present application (the number of symbols of GAP is 1).

[0096] The mapping definition of Type A PSCH is as follows:

[0097] The number and starting position of the scheduling resource blocks of Type A PSCH can be configured by the higher layer, where the starting position of the resource block is as follows: Figure 6 The Δ shown in the figure is determined by the frequency domain position of the synchronization channel and has a value range of -7≤Δ≤8. The number of resource blocks occupied by the DMRS of Type APSCH is the full bandwidth, that is, the same as the number of resource blocks of the working bandwidth. The DMRS of Type A PSCH is mapped by sampling 2PORT. The mapping definition is shown in Figure 5 The data of Type A PSCH is sampled and mapped to 1PORT.

[0098] Defines the resource block index of the PSS center frequency on the synchronization grid If the value is 0, Figure 6 The calculation formula for Δ in is as follows:

[0099] Step 1: Calculate the starting resource block index of the PSS on the synchronization grid

[0100] The PSS sequence length occupies 11 resource blocks in the frequency domain, so the starting resource block index of the PSS is

[0101]

[0102] Step 2: Calculate the starting resource block index of the PSS on the frequency grid

[0103]

[0104] Step 3: According to the starting resource block index of the allocated data channel Calculate Δ:

[0105]

[0106] Regarding frame structure type II:

[0107] For frame structure type II, including: control channel, data channel and protection interval, for its resource mapping, this application implements one of them, for example Figure 7 shown.

[0108] Figure 7 In the control channel, the control channel is basically the same as the control channel definition of frame structure type I, as follows: Similarities: the symbol position occupied by PCCH in the time domain, and the starting position of the resource block occupied in the frequency domain; Differences: the aggregation level of PCCH (the number of occupied resource blocks) is different from that of frame structure type I, and the aggregation level of PCCH supports dynamic adaptive adjustment.

[0109] Figure 7 In the time domain, the data channel occupies the symbol following the control channel symbol starting with the OFDM symbol, up to the last OFDM symbol (the 13th OFDM symbol). The specific number of symbols is determined by the number of control channel and gap symbols: data channel symbol number = 14 - number of control channel symbols plus number of gap symbols. In the frequency domain, the minimum number of resource blocks is one, and the maximum number of resource blocks is 273. Both continuous and non-contiguous resource block allocation (RIV) are supported. The number of guard interval symbols can be dynamically changed, ranging from 0 to 6 symbols.

[0110] Figure 7 In the time slot ratio: the time slot ratio of frame structure type I and frame structure type II supports semi-static configuration, which is determined by the period of frame structure type I, such as Figure 3 The static timeslot period is configurable, and its value is carried by a specific higher-level parameter, which is carried in the signaling carried by the Type A PSCH. This signaling also carries the delay time for the parameter to take effect, in timeslots. See Table 3.

[0111] Table 3 Definition of related fields of high-level parameters

[0112]

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. A frame structure design method based on 5G waveform, characterized in that: include: The frame structures used by the data channel, the synchronization channel and the control channel are divided into a first frame structure type and a second frame structure type; the first frame structure type and the second frame structure type occupy the same number of symbols in the time domain; The frame structure of the first frame structure type consists of a synchronization channel, a control channel, a data channel and a guard interval; The synchronization channel consists of PSS and SSS; The frame structure of the second frame structure type consists of a control channel, a data channel and a guard interval; The control channels in the first frame structure type and the second frame structure type occupy the same number of symbols; The time slots of the first frame structure type and the second frame structure type are respectively defined as static time slots and dynamic time slots, and the proportion of the dynamic time slots in the entire time slots is higher than the proportion of the static time slots in the entire time slots; The minimum resource block in the frequency domain for both the first and second frame structure types is one resource block, and 12 resource units constitute one resource block; in the time domain, a single time slot has a total of 14 symbols.

2. The method according to claim 1, characterized in that The resource mapping of the time-frequency domain of the first frame structure type includes the resource mapping of the synchronization channel, control channel, data channel and guard interval. The time-frequency resource mapping of a single time slot occupies 14 symbols in the time domain and 273 resource blocks in the frequency domain. The total number of time-frequency resource units is 273*14; the control channel occupies 1 or 2 symbols in the time domain, and the synchronization channel occupies 2 symbols in the time domain, of which PSS and SSS each occupies 1 symbol; the number of symbols occupied by the data channel in the time domain is determined by the number of symbols of the synchronization channel, control channel and guard interval; the mapping resources of the data channel include the time-frequency resource units occupied by data and pilot respectively.

3. The method according to claim 2, characterized in that For the time-frequency domain resource mapping of the first frame structure type, in the frequency domain, the frequency domain resource mapping position of the synchronization channel is indexed in units of resource blocks, and its frequency domain starting position is an integer multiple of 6 resource blocks; for different working bandwidths, the working frequency band is divided into multiple sub-bands, and a unique PSS frequency domain candidate position and SSS frequency domain candidate position are defined in each sub-band, and all PSS frequency domain candidate positions and SSS frequency domain candidate positions constitute the frequency domain candidate set of the synchronization channel; the frequency domain resources of the synchronization channel are defined on the synchronization grid; when calculating the frequency domain starting position of the synchronization channel, the starting resource block of the synchronization channel is aligned to the corresponding resource block on the frequency grid and used as the starting resource block of the synchronization channel.

4. The method according to claim 2, characterized in that For the time-frequency domain resource mapping of the first frame structure type, in the frequency domain, the frequency domain resource mapping position of the control channel is indexed in resource blocks. The frequency domain resource mapping position of the control channel is determined by the resource block index of the frequency domain resource mapping position of the synchronization channel. That is, the resource block index value of the frequency domain resource mapping position of the synchronization channel is added with an offset value to obtain the frequency domain starting position of the mapped resource block of the control channel. The offset value is an integer, the unit is resource block, and the specific value is specified by the high-level parameter; For the time-frequency mapping of the first frame structure type, in the frequency domain, the resource mapping of the data channel occupies at least one resource block, and the maximum number of resource blocks occupied is 273-the number of resource blocks occupied by the synchronization channel; the data channel supports both continuous frequency domain resource mapping and non-continuous frequency domain resource mapping.

5. The method according to claim 1, wherein The first frame structure type allows mapping multiple data channels within a single time slot. For the mapped multiple data channels: In the frequency domain, the occupied frequency domain resource blocks are frequency division multiplexed, and their pilot resource blocks and data resource blocks support mapping on one port or two ports; in the time domain, the number of occupied symbols is determined by the number of symbols of the synchronization channel, the number of symbols of the control channel, and the number of symbols of the guard interval, that is: the number of symbols occupied by the data channel is 14-the number of symbols of the synchronization channel-the number of symbols of the control channel-the number of symbols of the guard interval.

6. The method according to claim 1, characterized in that In the first frame structure type, there is at least one data channel, which is defined as Type A PSCH. The time-frequency resource position of the data channel is determined by the time-frequency position of the synchronization channel. The time-frequency resource is defined as follows: In the frequency domain, resource allocation is based on resource blocks. Continuous resource block allocation is used, occupying N consecutive resource blocks. The frequency domain starting position of the resource block is calculated by the frequency domain starting resource block index value of the synchronization channel, that is, the frequency domain starting resource block index value of the synchronization channel plus an offset value. The offset value is an integer in resource blocks, and the specific value is specified by high-level parameters. In the time domain, the number of occupied symbols is: 14 - the number of synchronization channel symbols - the number of control channel symbols - the number of guard interval symbols.

7. The method according to claim 6, characterized in that The data channel of Type A PSCH is used to carry broadcast signaling. The calculation method of its frequency domain starting position Δ is: First, define the resource block index of the center frequency of the synchronization channel on the synchronization grid The value is 0; Calculate the starting resource block index of the synchronization channel on the synchronization grid The PSS sequence length occupies 11 or 12 resource blocks in the frequency domain, and the starting resource block index of the synchronization channel is Calculate the starting resource block index of the synchronization channel on the frequency grid According to the starting index of the allocated data channel Calculate Δ: is the offset value.

8. The method according to claim 1, characterized in that The control channel of the second frame structure type occupies the same symbol position in the time domain as the control channel of the first frame structure type, and the control channel of the second frame structure type occupies the same resource block starting position in the frequency domain as the control channel of the first frame structure type. The number of symbols occupied by the data channel of the second frame structure type in the time domain = 14 - the number of control channel symbols - the number of symbols in the guard interval. In the frequency domain, the minimum number of resource blocks occupied by the data channel is 1, and the maximum number of resource blocks occupied is 273; both continuous frequency domain resource mapping and non-continuous frequency domain resource mapping are supported.

9. The method according to claim 1, characterized in that The time slot ratio between the first frame structure type and the second frame structure type supports semi-static configuration, which is specifically determined by the period of the first frame structure type; The time slot allocation period between the first frame structure type and the second frame structure type is configurable. The value of the period is carried by a specified high-level parameter, which is carried by the signaling carried in the data channel of Type A PSCH. At the same time, the signaling also carries the delay time for the high-level parameter to take effect, in time slots.

10. The method according to claim 1, characterized in that The first frame structure type and the second frame structure type both support different subcarrier sampling intervals; As the subcarrier spacing index increases, the time slot length of the radio frame remains unchanged, the length of the radio subframe increases successively, and the length of each time slot increases successively; As the subcarrier spacing index increases, the subcarrier spacing increases and the time slot length decreases.

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